Abstract: An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to regulate an output voltage generated in response to an input signal and a feedback of the output voltage. The second circuit may be configured to further regulate the output voltage in response to the input signal.

Abstract: This invention presents a method and apparatus for controlling the operating point, i.e. the output voltage or current, of a fuel cell to a desired value, efficiently transferring the available fuel cell power to a rechargeable battery and load, and isolating the fuel cell from the battery and load. Active control of the operating point of the fuel cell allows for optimized power output and fuel cell efficiency. This invention uses feedback from the input to regulate the input voltage or current. The output of the DC-DC converter either charges the battery or helps the battery supply the load, and is maintained equal to the battery voltage as the output of the DC-DC converter is directly connected to the battery.

Abstract: A power supply facility includes a primary power circuit coupled to energize a CPU, a control circuit coupled to the CPU, and an auxiliary power circuit coupled to the control circuit for supplying electric power to the CPU via the control circuit. A detecting device nay detect the power supply to the CPU, and may actuate the control circuit to couple the auxiliary power circuit to energize the CPU when the primary power circuit is unable to energize the CPU, or when the electric power supplied to the CPU is cut off, or when the power supply is less then the required value.

Abstract: As the application range of solar power generation systems widens, a number of relatively compact and lightweight inverters must be installed outdoors. However, an inverter has no burglarproof function at all. A burglarproof device which switches the state of the burglarproof function upon receiving a burglarproof function state change signal, and outputs an alarm signal when the output signal output in the alarm state from a connection detection section indicates that the power supply or load is disconnected is added to the inverter.

Abstract: The present invention relates to a closed-loop method of controlling the switch operation of a pulse width modulation circuit in the delivery of power to a load. This is done by measuring the power required of the input pulse, integrating the actual power delivered of the output pulse, calculating the power difference between the ideal pulse and the actual pulse, and compensating in the next pulse for error with appropriate offset. A high-speed processor compensates for the error, and generates a timing stream signal to control the modulation frequency of the PWM circuit. This is done on a pulse-to-pulse basis, thus allowing dynamic and nearly instantaneous error correction. Combined with existing PWM technology, the present invention increases the transfer efficiency and the linearity of power delivered to a load. As a direct benefit of precise switching control and low energy losses, smaller heat sink is required as well as less thermal stress is applied on the system.

Abstract: A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle adjustment. The operation of the multi-function terminal varies depending on whether a positive or negative current flows through the multi-function terminal. A short-circuit to ground from the multi-function terminal enables the power supply controller. A short-circuit to a supply voltage from the multi-function terminal disables the power supply controller. The current limit of an internal power switch of the power supply controller may be adjusted by externally setting a negative current from the multi-function terminal.

Abstract: An extended jacket with video input and output comprises a CF extended card unit, a digital camera connector, a video input connector, a video input handling unit, a universal connector, a video data storage unit, a read/write control unit, a video data output handling unit, a far end remote control unit and a power supply unit. The extended jacket can output the video signal to a display device (VGA S-VHS/COMPOSITE VIDEO) via an universal connector or the external video signal is imported into the operation system to be edited and treated and is temporarily saved or output to the display device with an added function of CF card extension and an added remote control device for controlling the display on the display device. Additionally, an independent power supply system is equipped internally to prevent a problem resulting from an increased power consumption demands of the PDA and provide a function for facilitating hot insertion and extraction therein.

Abstract: An extended jacket with video input and output comprises a CF extended card unit, a digital camera connector, a video input connector, a video input handling unit, a universal connector, a video data storage unit, a read/write control unit, a video data output handling unit, a far end remote control unit and a power supply unit. The extended jacket can output the video signal to a display device (VGA S-VHS/COMPOSITE VIDEO) via an universal connector or the external video signal is imported into the operation system to be edited and treated and is temporarily saved or output to the display device with an added function of CF card extension and an added remote control device for controlling the display on the display device. Additionally, an independent power supply system is equipped internally to prevent a problem resulting from an increased power consumption demands of the PDA and provide a function for facilitating hot insertion and extraction therein.

Abstract: An electrical voltage arrangement is to be provided with which different electrical input variables, for example in the form of a unidirectional voltage, a bidirectional voltage or a unidirectional current, can be converted into an impressed electrical output voltage. At the same time, there is to be a predefined relationship between the input variable and the output voltage. The circuit arrangement contains a first arithmetic circuit which converts a voltage fed to it into a first impressed voltage, and a second arithmetic circuit which converts an input voltage fed to it into a second impressed voltage. The voltage which is present at the input terminals of the circuit arrangement is fed to the first arithmetic circuit. The voltage which drops across a resistor which can be connected to the input terminals of the circuit arrangement is fed to the second arithmetic circuit.

Abstract: A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle adjustment. The operation of the multi-function terminal varies depending on whether a positive or negative current flows through the multi-function terminal. A short-circuit to ground from the multi-function terminal enables the power supply controller. A short-circuit to a supply voltage from the multi-function terminal disables the power supply controller. The current limit of an internal power switch of the power supply controller may be adjusted by externally setting a negative current from the multi-function terminal.

Abstract: A slope compensation circuit that provides slope compensation signals for switching voltage regulators is provided. The slope compensation circuit includes a feedback circuit, a control circuit, and a slope signal generator circuit. The feedback circuit generates a feedback signal that is indicative of both input and output voltages. The control circuit acts as a voltage controlled resistor that varies its resistance based on the feedback signal in order to control the slope signal generator circuit so that an optimum amount of slope compensation is provided.

Abstract: A method to dynamically clamp the feedback control voltage in DC—DC converters, with the purpose to limit the duty-cycle and to protect the magnetic components against saturation, over a wide range of input voltage conditions. The clamping level is function of input voltage and allows the design optimization of the magnetic components in the way of minimizing their size and is active only during transient events, when momentary open loop condition may occur.

Abstract: A low power mode and feedback arrangement for a switching power converter. Two or more main power switches, such as transistors, transfer energy from a supply to load by their opening and closing. When the load requires a relatively low power level, this condition is detected. In response, one or more of the transistor switches is disabled from switching and the reduced power requirements of the load are handled by the remaining one or more transistor switches. As a result, switching losses are reduced. This is because parasitic gate capacitance and on-resistance associated with the disabled switches no longer consume power from the power source. The invention provides significant efficiency advantages during periods when the load draws a low level of power. This is especially useful for battery-powered devices which may operate in a low power mode for extended periods of time, such as standby mode as in a portable telephone.

Abstract: A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle adjustment. The operation of the multi-function terminal varies depending on whether a positive or negative current flows through the multi-function terminal. A short-circuit to ground from the multi-function terminal enables the power supply controller. A short-circuit to a supply voltage from the multi-function terminal disables the power supply controller. The current limit of an internal power switch of the power supply controller may be adjusted by externally setting a negative current from the multi-function terminal.

Abstract: A device for recognizing power sources and associated method are provided. The device for recognizing power sources comprises two voltage-dividing devices. Both of the voltage-dividing devices is coupled to a native power, and output the partial voltage of the native power. According to the method, an output end of one voltage-dividing device is coupled to a signal end of the controller, and an output end of the other voltage-dividing device is coupled to the other signal end of the controller. When the native power exists, both of the above-mentioned signal ends are in a high voltage level. On the other hand, when the native power does not exists, both of the above-mentioned signal ends are in a low voltage level. The power source of the hardware device and the value of the native power can be exactly recognized according to the voltage levels of the both signal ends.

Abstract: A self-oscillating buck converter includes a controllable switch, a device for controlling the controllable switch, a device for sensing the output voltage of the buck converter, a device for sensing the output current of the buck converter, and a device for sensing the input voltage of the buck converter. The control device controls the controllable switch in such fashion that the output current level varies in dependence upon the output voltage and the input voltage.

Abstract: A power output circuit having a pulse-width modulation generator and an upstream closed-loop control circuit which switches the pulse-width modulation generator and the power output stage to a permanently open mode, a PWM mode having pulse-width-modulated pulses, and a permanently closed mode as a function of a preset external setpoint, an actual value of the power output stage, and a reference voltage derived from the supply voltage. High power loss and high EMC in the full-load threshold region are avoided by prematurely switching from the PWM mode to the permanently closed mode as a function of a preset setpoint and the supply voltage, and returning to the PMW mode with a hysteresis of these values.

Abstract: A control system and method for supplying a constant RMS voltage to a load includes a outer control loop for monitoring a characteristic variable of the system and an inner control loop for maintaining the power delivered to the load as a function of the received input power. A pulse width modulator (PWM) coupled to both control loops delivers pulses representative of an unregulated input voltage duty cycle. The inner control loop compares the duty cycle representation of the input voltage with a duty cycle representation of the pulse and generates a control signal to the PWM accordingly.

Abstract: An industrial truck is provided with a direct current power supply and at least one electrical user (2), e.g., a lighting device located in a housing, wherein the power supply voltage of the power supply (3) is greater than the nominal voltage of the user (2). To connect the user (2) to the power supply, there is a voltage transformer (4) which is located inside the housing or in the immediate vicinity of the housing. The invention also relates to a voltage transformer which applies a power supply voltage to a user (2) in pulses, so that the power delivered to the user, as an average over time, does not exceed the nominal power of the user (2).

Abstract: A variable frequency RF power delivery system is used with a control system that adjusts the output frequency of the RF power delivery system. Frequency adjustments are made so as to maintain the required input current and input voltage within the capabilities of the input current and input voltage source.

Abstract: The invention relates to a converter including a fly-back circuit (5). For obtaining a maximum possible adaptation to the internationally different network voltages, there is proposed to provide a first fly-back frequency range for a converter input voltage (Unet) lying in a first voltage range and a second fly-back switching frequency range for a converter input voltage (Unet) lying in a second voltage range, the first voltage range having smaller voltage values than the second voltage range and the first fly-back switching frequency range having larger frequency values than the second fly-back switching frequency range.

Abstract: A power conversion arrangement includes a transformer disposed between an input circuit and an output circuit. The transformer has primary and secondary windings coupled to the input and output circuits, respectively. Current passing through the input circuit is sensed and detected by a detecting circuit which generates a signal proportional in magnitude to the output current sourcing out of the output circuit.

Abstract: A power supply suitable for use with discharge lamps includes at least one power factor corrector module for connection to a three phase input supply. Each module includes three single phase circuits for connection between a respective pair of phases, each circuit comprising a converter. The output of the three single phase circuits are connected in series. The module further includes control for varying the duty cycle of the converters using a respective reference signal synchronized with the input voltage to the corresponding converter, and inversely proportionally to a measured instantaneous input voltage to the corresponding converter. Each reference signal is sinusoidal and the control varies the duty cycle of each of the converters proportionally to the square of the respective sinusoidal reference signal. The current drawn by each converter is sinusoidal, even if the mains contains distortions.

Abstract: A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle adjustment. The operation of the multi-function terminal varies depending on whether a positive or negative current flows through the multi-function terminal. A short-circuit to ground from the multi-function terminal enables the power supply controller. A short-circuit to a supply voltage from the multi-function terminal disables the power supply controller. The current limit of an internal power switch of the power supply controller may be adjusted by externally setting a negative current from the multi-function terminal.

Abstract: The present invention provides a self-supplied DC/DC switching power supply circuit for emergency notification and similar applications. The circuit includes a control circuit in electrical communication with an igniter circuit. The igniter circuit provides a temporary activation voltage to the control circuit for activation thereof. The igniter circuit provides the activation voltage for a limited time duration sufficient for enablement of the switching power supply circuit after which time power is supplied to such control circuit by the output voltage. The present invention SPS circuit can use a single-cell battery pile or other low-voltage source as low as 0.3V DC while realizing improved efficiency over a wide range of input voltages.

Abstract: An inrush current control circuit having an input terminal connected to a DC power supply and an output terminal connected to a load capacitor limits the inrush current that charges up the load capacitor during power up of a system. When the DC power supply applies a DC voltage to the input terminal, the inrush current control circuit produces a voltage ramp at the load capacitor instead of an abrupt DC voltage. The voltage ramp results in a constant low level current to charge up the load capacitor, greatly reducing the current drain on the DC power supply.

Abstract: A voltage regulator that includes a transistor, a first amplifier and a second amplifier. The voltage regulator maintains a voltage between a first node and a second node within a predetermined range by maintaining a current level flowing from the first node to the second node. The transistor has a first pole electrically coupled to the first node, a second pole electrically coupled to the second node and a gate. The first amplifier has a first input, a second input and an output, and the second amplifier has a first input, a second input and an output, wherein the first inputs of the first and second amplifiers are electrically coupled to the first node, the second inputs of the first and second amplifiers are electrically coupled to the second node, and the outputs of the first and second amplifiers are electrically coupled to the gate of the transistor, respectively. The first and second amplifiers have different characteristic response times to reach a saturation voltage value.

Abstract: When an output impedance of an input power supply for a switching regulator is high, damages caused by a large current are suppressed which are given to switch elements employed in a power supply circuit and the switching regulator. In a step-up type switching regulator control circuit comprising at least an error amplifying circuit and a drive circuit of a switch element and producing an output voltage higher than an input voltage, the error amplifying circuit is operated by the input voltage; the drive circuit of the switch element is operated by the output voltage; the step-up type switching regulator control circuit is further comprised of a voltage detecting circuit operated by the output voltage; the voltage detecting circuit detects the input voltage, and when the input voltage is decreased lower than an arbitrary voltage, the voltage detecting circuit causes the drive circuit of the switch element to produce such a signal capable of firmly turning OFF the switch element.

Abstract: In order to avoid a ripple voltage and to ensure that an adequate voltage is applied to a load even when a supply voltage is low, the duty ratio of a PFM type switching regulator is provided with a supply voltage dependency. A control circuit for a PFM type switching regulator according to a first embodiment comprises a first circuit for producing a first output signal based on a difference between a fed back portion of a regulated output voltage of a PFM type switching regulator and a first reference voltage; and a second circuit for producing a second output signal based on a second reference voltage, the second output signal being used for modulating the first output signal and including a pulse signal having successive pulses the width of which is dependent upon the value of the second reference voltage so that the duty cycle of the PFM type voltage regulator is dependent upon the second reference voltage.

Abstract: A rotary nozzle device has

Abstract: An adapter circuit PSA includes a comparator module OA, and a regulation module RM for normally adjusting the value of an output voltage Vout intended to be applied to an external circuit to a predetermined nominal regulation value Vreg0. In response to a measuring module SC sensing a reverse current flow at the output which is produced when an external power supply source in the external circuit connected to the output of the adapter circuit PSA includes an effective voltage source Vext which imposes on the output a voltage VDD which has a higher value than the nominal regulation value Vreg0, feedback coupled to an input to the comparator module OA is activated to raise the value to which the output voltage VDD is regulated to equality with the value of the effective voltage source Vext, thereby nulling the output current.

Abstract: Techniques are disclosed for converting available electrical power to desirable electrical power. One embodiment of the techniques calls for a boost circuit to convert low power Win at a terminal TVin to high power Wout at a terminal TVout. The boost circuit includes a voltage generation circuit, a capacitor Cstore, a timing-control generator, and a boost regulator. The voltage generation circuit converts voltage Vin at terminal TVin to voltage Vstore at a terminal TVstore wherein, in one embodiment, Vstore is less than Vin. Further, the current Icharge provided by the voltage generation circuit at terminal TVstore is less than the current Iin at terminal TVin. In one embodiment, capacitor Cstore, being charged by current Icharge, stores necessary charge to provide appropriate currents and voltages to the boost regulator. The timing-control generator uses voltages Vin and Vstore to provide a timing-control signal Tcontrol, which controls the timing operation of the boost regulator.

Abstract: A computer storage system includes director boards which control transfer of data to and between a host computer, a system cache memory and a disk array. The directors are provided with features which enhance system performance and reliability. A hardware emulation controller permits a high performance processor to be used with existing system circuitry. A control store memory is organized with primary and secondary data areas and primary and secondary parity areas. Data is written to both the primary and secondary areas. A read request accesses data in the primary area and performs a retry in the secondary area in the event of a parity error. A power supply system includes on-board marginable power supplies to facilitate testing and power-up by-pass circuits for protection of sensitive circuitry. A system clock configuration employs primary and secondary clocks to ensure redundancy of synchronized timekeeping.

Abstract: A controller for a solar electric generator that permits the generator to produce power substantially at its maximum capacity while also providing efficient charging at three charging stages; i.e., bulk charging, acceptance charging and float charging. Power is transferred from the generator to a temporary electric storage device that is periodically partially drained of power to maintain the temporary electric storage device at a voltage corresponding to the voltage needed by the generator to provide maximum generator power. The electric power drained from the temporary storage device is used to charge conventional batteries. In a preferred embodiment, the temporary storage device is a capacitor that is part of a buck regulator operating at 50 kHz with duty factor control between 0% and 100%. This buck topology switching type regulator provides the periodic draining.

Abstract: A dynamically boosted current source circuit improves the response speed of a circuit responsive to a transitioning input signal. The circuit's responsiveness varies with the magnitude of the current provided to an identified node, and a current source capable of providing nominal and boosted currents is connected to the node. A threshold detector detects the occurrence of an input signal transition prior to its detection by the responsive circuit, and triggers the current source to provide the boosted current; this improves the responsive circuit's speed by charging or discharging identified node capacitances which hinder its operation. The identified node can be an input node, an output node, or an internal node. The current source provides the boosted current for a predetermined time interval, or until the input signal crosses a second threshold, enabling response speed to be increased without a significant increase in supply current.

Abstract: A high-voltage sensing circuit is provided that inhibits or prevents a low-voltage from being inadvertently sensed as a high-voltage during power-up and power-down and triggering a high-voltage operation such as a chip erase. The high-voltage sensing circuit comprises a low-power supply sensing circuit for generating a control signal in response to the detection of a power supply level and a switch, controlled by the control signal, that receives the input voltage and passes an output voltage if the input voltage is greater than a reference voltage. Until the power supply exceeds a certain amount, a switching transistor will be OFF and VIN (the output of the charge pump) will not be high enough. Thus, a low-voltage is prevented from being inadvertently sensed by the high-voltage sensing circuit as a high-voltage and triggering a high-voltage operation such as a chip erase.

Abstract: A circuit arrangement (10) for the batteryless power supply of the electronic control of a portable machine driven by an internal combustion engine, which machine possesses a d.c. voltage generator driven by the internal combustion engine, which delivers a generated voltage dependent on the number of revolutions of the internal combustion engine, which is transferred to a rated d.c. voltage (Vcc). The circuit arrangement (10) includes a first rectifier circuit (D1, C1), which converts the generator voltage (Ug) into an intermediate d.c. voltage (Uz), which permits the same, without booster batteries, to reliably and controllably supply the electronics of an engine-driven machine, especially in the starting phase, with the requisite rated d.c. voltage.

Abstract: A power supply for supplying a main electrical circuit during normal operation and an auxiliary electrical circuit during standby operation, includes a switched power converter, which is connected between an input voltage and the main electrical circuit and has an inductor, a controllable switch, a first rectifying unit and a control unit for the switch. A second rectifying unit couples the voltage dropping across the inductor into the auxiliary electrical circuit. During standby operation, the control unit controls the switch in such a way that the switched power converter is operated in resonance mode.

Abstract: Switching control is remarkably simplified and a DC voltage is boosted, and then, an input power factor is sufficiently improved and harmonics are reduced by connecting a full-wave rectifier circuit to an AC power source through a reactor, and connecting a smoothing capacitor and boosting capacitors, which are connected in series with each other, in parallel between the output terminals of the circuit. In addition, a switching device is connected between the input terminal of the circuit and the connecting point between the boosting capacitors, and a control device is provided to control the switching device so that the switching device can be switched at every half cycle of the power source voltage.

Abstract: In a switching power supply generating at least a first output voltage and a second output voltage, the second output voltage, being of lower potential is applied to a linear regulator, the power supply further including a storage capacitor on the first output, a holdover circuit includes a comparator circuit for monitoring the first output voltage and for generating an output signal when the first output voltage decreases below predetermined value. A switch is connected to the storage capacitor, the comparator circuit, and the linear regulator. The switch is activated by the comparator output signal and applies the voltage stored in the storage capacitor to the linear regulator. A clamp circuit is connected to the switch for limiting the magnitude of the voltage from the storage capacitor to the linear regulator when the switch is activated.

Abstract: An expedient and simplified uninterrupted power-supplying apparatus is provided. Such apparatus includes a power-storing device for storing an electric signal in a first instance and releasing the electric signal in a second instance, an AC/DC converting device for converting an AC signal provided by the power source into a DC signal, a DC/DC converting device for receiving the DC signal, and generating the uninterrupted power and storing the electric signal in the power-storing device in response to a voltage thereof in the first instance, and receiving the released electric signal and generating the uninterrupted power in the second instance, and a controlling device for controlling the DC/DC converting device to store the electric signal in the power-storing device and making the AC/DC converting device vary the DC signal in response to the voltage of the power-storing device. The invention also discloses a method for supplying an uninterrupted power.

Abstract: A controller for a solar electric generator that permits the generator to produce power substantially at its maximum capacity. Power is transferred from the generator to a temporary electric storage device that is periodically partially drained of power to maintain the temporary electric storage device at a voltage corresponding to the voltage needed by the generator to provide maximum generator power. The electric power drained from the temporary storage device is used to charge conventional batteries. In a preferred embodiment, the temporary storage device is a capacitor that is part of a buck regulator operating at 50 kHz with duty factor control between 0% and 100%. This buck topology switching type regulator provides the periodic draining. In the preferred embodiment control of the duty factor of the buck regulator is utilized to limit current, to prevent battery over charging, to test for the voltage corresponding to maximum power, and to operate the solar generator at is maximum power voltage.

Abstract: Dashboard dimmer light circuit for a vehicle, for example a car or truck. A power supply 10 provides a step-function voltage signal to an op-amp oscillator circuit 20 which provides a triangular voltage oscillation signal to an op-amp level comparator 40 which, in turn, compares the triangular voltage oscillation signal to a voltage reference for providing a pulse-width-modulated (PWM) voltage signal to a power FET driver 70 which, in turn, responds to the pulse-width-modulated voltage signal by providing a current signal to an automobile dashboard dimmer light 80. Features of the invention include a) a dashboard dimmer light having a stable oscillator frequency, b) PWM duty cycle stability in a dashboard dimmer light, c) efficient accomplishment of the invention's oscillator and level comparator functions within a single IC, d) reduction of electromagnetic interference which might otherwise intefere with other electronic equipment in the dashboard.

Abstract: A power supply unit for use by on-vehicle equipment, including a booster portion and a circuit portion. The booster portion boosts a supply voltage from an onboard battery of a vehicle and feeds the boosted supply voltage to the circuit portion. The booster portion is separated from the circuit portion and located close to the onboard battery of the vehicle.

Abstract: Efficient very low dropout (i.e., approximately equal to about V.sub.CESAT of the output transistor) dual supply voltage regulator circuits and methods are provided. The voltage regulators are capable of providing very low dropout irrespective of supply sequencing. Traditional supply sequencing problems are overcome by including an power-on circuit that monitors the output power supply during power-on. The power-on circuit is also coupled to any location in the regulator circuit where the drive current can be inhibited whenever the output power monitor senses that the output power supply is not fully operational. The power-on circuit operates to prevent drive current from being supplied to the output transistor unless output power is available so that the substrate of the regulator is not permitted to become forward biased (and thus prevents the establishment of an undesired latch condition).

Abstract: A voltage supply circuit for a CPU of a programmable controller is provided, the CPU receiving via the voltage supply circuit at least two supply voltages obtained from an input voltage. The circuit operates in a manner such that when the input voltage is increased from an open-circuit potential, a first supply voltage is received by the CPU as soon as the input voltage exceeds an upper input voltage threshold value. The second supply voltage is received by the CPU when the first supply voltage exceeds a primary supply voltage threshold value. When the input voltage decreases from a value (where both supply voltages are received by the CPU), the second supply voltage is no longer received by the CPU when the input voltage and drops below a lower input voltage threshold value, and also the first supply voltage is no longer received by the CPU as soon as the second supply voltage drops below a secondary supply voltage threshold value.

Abstract: For use with a power converter coupled to a regulation circuit and having a power switch and an auxiliary switch coupled thereto, a controller, method of operating the power switch and auxiliary switch and a power converter employing the controller and method. In one embodiment, the controller includes a voltage conditioning network, parallel-coupled to the power switch, capable of sensing a voltage across the power switch and developing a conditioned voltage. The controller further includes a drive circuit, coupled to the voltage conditioning network, adapted to provide a drive signal to control the auxiliary switch as a function of the conditioned voltage and a regulation control signal from the regulation circuit.

Abstract: A clocked power supply circuit having an at least intermittently active load that is independent of a consumer, in particular for supplying power to gas-discharge lamps as consumers, contains a dc/dc converter comprising a transformer. Switching elements connect the converter to a dc voltage source in the timing of a control arrangement which makes available switching signals for the switching elements as a function of the prevailing output-side load state. The transformer of the dc/dc converter is designed so that two voltages (U+, U-) of differing polarity and magnitude, are able to be tapped off from the output side. At least one of these voltages is regulated and provided for supplying power during operation of the consumer. The at least intermittently active load can be switched to the regulated voltage.

Abstract: In a battery charger, current regulating means and voltage regulating means can be prevented from damages. In the case where a loss of current regulating means (11) or voltage regulating means (12) exceeds an allowable loss, pulse width modulating means (15, 16) for generating a pulse signal having a desired pulse width and control means (18, 19) for intermittently operating the current regulating means or the voltage regulating means, having the loss exceeding the allowable loss, based on the pulse signal are provided to suppress the loss of the current regulating means or the voltage regulating means and suppress heat generated thereby, thus the current regulating means and the voltage regulating means can be protected from damages.

Abstract: An open loop control arrangement for an electrical energy flow-controlling circuit coupling the varying terminal voltage of an energy storing capacitor to a fixed voltage direct current aircraft energy supply bus in order to supplement bus voltage transients. The open loop control arrangement allows energy flow from the varying terminal voltage of the capacitor to the fixed bus voltage by providing a time varying pulse modulation cycle in an energy conveying and voltage changing inductive element located in the energy coupling path. The open loop control arrangement senses input voltage rather than output voltage of the coupling circuit in what is termed a "feed forward " output regulation algorithm. A transistorized and integrated circuit inclusive preferred embodiment of the invention is disclosed in which a disconnect of the inductance from the aircraft supply bus is accomplished during shunt path inductance energy charging portions of an operating cycle.