Abstract: An internal voltage generator is disclosed.

Abstract: A phase-controlled voltage regulator of the series type, for supplying A.C. and D.C. electric loads in electronic ignition systems for internal-combustion engines. The A.C. and/or D.C. electric load is connectable in series with a single winding magneto generator via a respective electronic control switch; the voltage existing on the electric load is continuously detected and set to a supply voltage value required by the load by controlling the start time, and the time length of activation of the electronic control switch, during each half-wave of the generator voltage having a same polarity, in relation to the detected voltage on the electric load itself; no-load operating conditions for the magneto generator are maintained during the initial period of time for each half-wave, inhibiting the conduction of the electronic control switch.

Abstract: A multiple voltage alternator system for directing power in a vehicle between an alternator, a single battery and loads connected thereto which require power at a higher DC voltage and a lower DC voltage. In one embodiment, first and second bi-directional converters operate synchronously and are coupled together through a transformer having first and second windings. The alternator supplies power directly at one voltage and indirectly through the bi-directional converters at the other voltage when the vehicle engine is running. The battery operates at the opposite voltage from the alternator, preferably at the lower voltage, and directly supplies power at one voltage and indirectly at the other voltage when the alternator is not providing power. In an alternative embodiment the bi-directional converters are coupled through an autotransformer.

Abstract: Circuits and methods for regulating an auxiliary output with an over-winding on a synchronous buck regulator are provided. Though these regulators have produced regulated auxiliary outputs in conventional circuits, the regulation used in conventional circuits has not been maximized. This caused the auxiliary output voltage to vary with changes in load on the primary output as well as with changes in load on the auxiliary output. The present invention directly regulates the auxiliary output voltage of the synchronous buck regulator by adjusting the gate amplitude of a MOSFET switch located in the power loop of the auxiliary output.

Abstract: Method for regulating a plurality of output voltages of a converter, of which a first output voltage controls the converter and further output voltages are kept constant by readjusting elements, it being the case that when a prescribed voltage difference across the readjusting element is exceeded, the converter is controlled by a control loop, proceeding from the respective readjusting element.

Abstract: A personal computer includes a DC to DC converter which employs a dual function capacitive energy storage device at the output rail of the converter. The energy storage device provides both a transition control function and a bulk or output function. In this manner, the size and expense of a separate bulk capacitor is advantageously avoided. The converter includes a switching transistor coupled to a bulk inductor. The switching transistor exhibits a high frequency switching rate which is sufficiently high to permit the inductor to directly replenish the capacitive energy storage device thus enabling the converter to withstand both major and minor load fluctuations without loss of voltage regulation at the output rail.

Abstract: A device for providing a high d.c. voltage supply and a low d.c. voltage supply. The device includes, in parallel, a first diode connected in series with a capacitor, a rectifier having a polarity opposite to that of the first diode, and a breakover voltage limiter. The terminals of the low d.c. voltage source correspond to the terminals of the capacitor.

Abstract: A method and apparatus for using feedback to control the output voltage of a Switch Mode Power Supply (SMPS) that is used as the input voltage to subsequent Low Drop Out (LDO) linear voltage regulators. A multiplexer and Analog to Digital Converter (ADC) are used to successively sample the output voltages of multiple parallel LDO regulators. The digitized voltage values are input to a digital processor that compares the LDO regulator output voltages with acceptable limits previously stored in memory. The digitized voltage values are used by the digital processor to control the output voltage of a SMPS that is used as the input voltage to the LDO regulators. The output voltage of the SMPS, and thus the input of the LDO regulators, is reduced to the minimum value that retains full performance of the LDO regulators. Operating each LDO regulator at full regulation ensures full performance of the LDO regulators. Minimizing the input voltage to the LDO regulators maximizes the efficiency of the total power supply.

Abstract: A method for the low-transient power control of electrical loads, particularly temperature-dependent loads electrically divided into essentially equal sub-loads connectable to an a.c. mains in order to receive power. Power control at low power levels utilizes alternately power-off phases, in which none of the sub-loads receive power for at least three a.c. half-waves, and heating phases, in which a temporal concatenation of at least a first and a second basic cycle of three a.c. half-waves supply power to each one of the sub-loads. The first sub-load receives power during one half-wave of the first basic cycle and the second sub-load receives power during one half-wave of the second basic cycle. The power is turned off during the other two half-waves of the first and the second basic cycle. Also disclosed is an electrical heating apparatus which embodies this method.

Abstract: For use with a power converter having a main output and an auxiliary output and an auxiliary regulating switch that regulates a voltage at the auxiliary output, a transient response network, and method of diverting energy from the main output to the auxiliary output. In one embodiment, the transient response network, includes: (1) an energy diverting switch interposed between the main output and the auxiliary output, and (2) a control circuit, coupled to the energy diverting switch, that senses a characteristic of the power converter and causes the energy diverting switch to conduct a current in response to a substantial load reduction at the main output thereby diverting energy from the main output to the auxiliary output.

Abstract: The output of the power unit 21 varies on the basis of the output of the power unit 22, and temperature-compensated in accordance with an ambient temperature. The control is performed by the output voltage control circuit 3. The output voltage of the power unit 21 is varied with an output voltage ratio between the outputs of the power units, and by compensating an output voltage of the power unit 22 in accordance with the ambient temperature, the output voltage of the other power unit 21 can be temperature-compensated by the control circuit 3.

Abstract: Various DC/DC converter topologies having improved electromagnetic interference (EMI) characteristics and methods of providing dual DC outputs with such converters. One embodiment of one DC/DC converter having dual, EMI-quiet outputs includes: (1) a first subcircuit, having a series-coupled first switch, first inductor and first capacitor and an output across the first capacitor, coupled between first and second DC input rails, (2) a second subcircuit, having a second switch, second inductor and second capacitor and an output across the second capacitor, coupled between the first and second DC input rails in anti-parallel with the first subcircuit, (3) a first diode coupling a node between the first switch and the first inductor and a node between the second inductor and the second capacitor and (4) a second diode coupling a node between the first inductor and the first capacitor and a second node between the second switch and the second inductor.

Abstract: A switching power supply apparatus which effectively utilizes energy accumulated in a leak inductance of a circuit to enhance the efficiency. The switching power supply apparatus having a switch element on/off controlled by a driving signal generated from a driver circuit, wherein a first capacitor and a first diode are inserted in series between both terminals of the switch , and a second capacitor and a second diode are further connected in series between a connecting point of the first capacitor and the first diode and a grounding terminal of the switch element to use charges accumulated on the second capacitor as a voltage source.

Abstract: A buck converter in accordance with the present invention provides multiple, well regulated, low voltage outputs. A cascaded buck converter comprises a main buck converter that is coupled to a subordinate buck converter through a cascade transistor in series with the free wheeling diode or transistor. The main buck converter is coupled to the free wheeling diode through the cascade transistor. Additional voltage outputs are possible by placing additional subordinate buck converters in series with the cascade transistor.An isolated forward converter with multiple output voltages in accordance with the present invention may be derived using the cascaded buck converter topology. The cascading configuration permits multiple voltage outputs using a minimum number of switching devices while avoiding undesirable cross regulation.

Abstract: A power sharing device is disclosed, having a primary utility in supplying power to automotive block heaters or other auto warming devices at a user selectable duty cycle of 12.5% or 25%. In a first mode, power is supplied to 4 outlets in a sequential manner, for 15 minutes each. In a second mode, power is supplied to the 4 outlets in a sequential manner, for 7.5 minutes each, followed by a period of 7.5 minutes in which power is not supplied. The user may elect to initiate a delay period, that is selectable between 1 and 2 hours, to precede the sequence of power distribution, allowing time for the car to cool before the power cycles begin. A test circuit, activated by a pushbutton, allows a user to distinguish between the periods of time when power is not being supplied to an outlet as a part of the sequential sharing of power between outlets and a circuit malfunction, such as a blown fuse.

Abstract: A power supply capable of compensating a failed voltage occurred therein includes an exclusive OR gate for performing an exclusive OR operation on a first and a second voltages to produce a failure detection signal to indicate a failure in either of a first or a second voltage source, wherein a level of the first voltage is higher than that of the second voltage, a voltage conversion device for converting the first voltage applied thereto to an equivalent to the second voltage and a switching transistor, in response to the failure detection signal, for permitting the first voltage to apply the voltage conversion device.

Abstract: Power consumption, in an apparatus for generating a display unit drive voltage, is reduced. The potential at a point A is held substantially intermediately between V0 and V5 by a potential corrector 36. Voltage regulators 31, 32 supplied with V0 are connected through point A to voltage regulators 33, 34 supplied with voltage V5. Point A in turn is connected to a charger storing unit 35. The charge storing unit 35 stores the charge flowing into point A. Wasteful flow of electricity is thus eliminated for a reduction in power consumption.

Abstract: Constant-current circuitry supplying constant current so as to drive a plurality of circuit blocks using a plurality of drive circuits. The constant-current circuitry includes not only a plurality of transistors for supplying current to the drive circuits, but also a bias circuit for supplying a predetermined voltage to the bases of the transistors. The bases of the transistors are commonly connected, and the emitters of the transistors are connected to the drive circuits. Such constant-current circuitry prevents the circuit blocks from interfering with each other.

Abstract: A power supply control apparatus for controlling a power supply circuit for outputting voltages of at least two systems is constructed by a first power supply circuit for generating a first voltage and a second power supply circuit for generating a second voltage, a controller circuit which is driven by the first voltage, a disconnecting circuit for disconnecting the second voltage by the controller circuit in accordance with a predetermined condition, a power supply controller circuit for controlling the second power supply circuit on the basis of the second voltage, and a supplying circuit for supplying a signal indicative of a state in which the second voltage has been outputted to the power supply controller circuit when the second voltage is disconnected by the disconnecting circuit.

Abstract: A step-down switching regulator of the present invention includes (1) a magnetic storage device having at least one primary output and one secondary output, (2) a current sensing device for detecting current through a primary winding of the magnetic storage device, (3) a first switch, (4) a second switch, (5) a first comparator for detecting whether the current through the primary winding is greater than a limit value, (6) a second comparator for detecting loss of regulation in the secondary output, and (7) a switch logic circuitry for allowing only one of the first switch or the second switch to turn on at a time. When the primary output is out of regulation, the first switch turns on to deliver power to the primary output. When the secondary output is out of regulation, one of two methods can be used to supply power to the secondary output. A first method turns on the first switch for a short time, and then the second switch turns on to deliver power to the secondary output.

Abstract: A circuit arrangement for generating at least two interdependent supply voltages from an input voltage includes a first control stage for controlling the actual value of a first one (Ua1) of the supply voltages to a first nominal value which is adjustable between a first upper and a first lower tolerance limit. At least one further control stage controls the actual value of each further one of the supply voltages (Ua2, . . . , Uan) to a further nominal value, which is preferably adjustable within a range between each time a further upper and a further lower tolerance limit, by varying the first nominal value in the range between the first upper and the first lower tolerance limit in response to control signals obtained by a comparison performed between the actual values of the further supply voltages (Ua2, . . . , Uan) and the associated further nominal values in the associated control stages. This simplified circuit arrangement improves the accuracy of the supply voltages under load conditions.

Abstract: A low power amplifier system contains a number of amplifier stages, each having a control terminal, and a bias circuit parameter that can be measured as a voltage. A monolithic integrated circuit includes a plurality of bias control amplifiers, one for each of the amplifier stages. A positive supply voltage is fed into the integrated circuit, and in response thereto a negative supply voltage is generated, both voltages being then applied to each of the bias control amplifiers. A voltage feedback signal indicative of the bias current in each one of the respective external amplifier circuits is supplied to the corresponding one of the bias control amplifiers. Each bias control amplifier is then operable to compare the received voltage feedback signal with a reference voltage derived from the positive supply voltage and/or the negative supply voltage, for producing an error signal indicative of an error in the bias current in the respective external amplifier stage, and also for amplifying that error signal.

Abstract: A circuit and method for an integrated multifunction voltage regulator is disclosed. The integrated circuit features a voltage preregulator having a battery input and a Vcc output, a voltage bus for distributing the Vcc voltage, and a plurality of function blocks which are connected to the Vcc buss and are driven by the Vcc voltage. The function blocks include voltage regulators, protected battery switches, band gap voltage references, and reset circuits.

Abstract: A source of an input supply voltage is coupled via a current limiting resistor to a load. A diode has a first terminal that is coupled to a junction terminal between the resistor and the load. A second terminal of the diode is coupled to an output of a regulated power supply where a regulated supply voltage is developed. The diode clamps a second output supply voltage developed at the first terminal of the diode to the regulated supply voltage. When the power in the load exceeds a predetermined value, the diode ceases conducting. In this way, the conductor that couples the second output supply voltage to the load need not meet the strict 15 watt node spacing requirements.

Abstract: A voltage regulator is switchable between a lower regulated DC output voltage and a higher regulated DC output voltage. Foldback current limiting is actuated in response to the current drawn by the load when a current limiting threshold is exceeded. The current limiting threshold is determined by the voltage relationship at respective taps of a pair of voltage dividers, with said relationship being effected by the voltage appearing across a current sensing resistor coupled in series with the load. The current limiting threshold is adjusted to be approximately the same for both the lower and the higher regulated DC output voltages. This adjustment is accomplished with a non-linear voltage dependent device, which is coupled to one of the voltage dividers, and is actuated in the higher output voltage mode.

Abstract: Constant-current circuitry supplying constant current so as to drive a plurality of circuit blocks using a plurality of drive circuits. The constant-current circuitry includes not only a plurality of transistors for supplying a current to the drive circuits, but also a bias circuit for supplying predetermined voltage to the bases of the transistors. The bases of the transistors are commonly connected, and the emitters of the transistors are connected to the drive circuits. Such constant-current circuitry prevents the circuit blocks from interfering with each other.

Abstract: A DC-DC converter, having multiple outputs, efficiently utilizes its power transformer to provide continuous power output to the outputs except during transitions of the power switches. Energy flow is continuous to one or more outputs during conduction of the power switch and then is transferred to the remaining outputs during its non-conduction. A feedback control, connected to sense only one of the outputs operate the power switch at a controlled duty cycle. Regulation of both outputs is enabled by equalizing transformer volt seconds of the non-conduction and conduction intervals of the power switch and by a clamping circuit which sustains the volt seconds in the power transformer during the non-conduction interval. In a particular embodiment, a converter circuit comprises a transformer having a primary winding and a secondary winding.

Abstract: A regulated power supply automatically accommodates either a positive or negative polarity connection of a power source and without regard as to whether the source is an DC or an AC source, and accommodating a wide range of input voltage sources. The power supply circuit includes a source voltage conditioning unit which includes an input fuse section, a surge protection circuit, a power switch, and a filter rectifier section, coupled in circuit between a set of external power source connection terminals and a set of output terminals from which a rectified and filtered intermediate voltage is derived. An open fuse detector alerts servicing personnel to an open condition of a user-replaceable input fuse. A DC-DC converter section includes a start up supply circuit and a primary drive winding of a power transformer connected to receive the intermediate rectified voltage from the filter rectifier of the input section.

Abstract: A step-down switching regulator of the present invention includes (1) a magnetic storage device having at least one primary output and one secondary output, (2) a current sensing device for detecting current through a primary winding of the magnetic storage device, (3) a first switch, (4) a second switch, (5) a first comparator for detecting whether the current through the primary winding is greater than a limit value, (6) a second comparator for detecting loss of regulation in the secondary output, and (7) a switch logic circuitry for allowing only one of the first switch or the second switch to turn on at a time. When the primary output is out of regulation, the first switch turns on to deliver power to the primary output. When the secondary output is out of regulation, one of two methods can be used to supply power to the secondary output. A first method turns on the first switch for a short time, and then the second switch turns on to deliver power to the secondary output.

Abstract: This invention measures the total line current in a power cord which is used to energize both a power factor corrected system and non-power factor corrected AC loads. The power factor control loop of the power factor corrected system is then driven to correct the power factor of total line current in the power cord ideally to approach unity.

Abstract: A voltage regulator especially adaptable for use with field-programmable gate arrays (FPGAs). The voltage regulator includes a frequency compensated differential amplifier, a configurable feedback network for setting the gain of the voltage regulator, and a plurality of source follower devices for driving the feedback network and providing a regulated supply voltage. A bandgap generator may also be provided for generating a reference bias voltage that is independent of temperature.

Abstract: A synchronized switch tapped coupled inductor circuit which couples a first closed-loop regulated output of a forward converter switching power supply to a second output to assist in regulating the voltage of the second output. The switched power supply includes a converter transformer which is implemented as a forward converter providing the multiple outputs. The second output includes a storage inductor which is coupled to a storage inductor of the first output. The second coupled inductor includes a center tap which is connected to a synchronized switch. The synchronized switch is further connected to the first output and coupled to the converter transformer to detect the forward and flyback portions of each cycle. During the flyback portion of each cycle, the switch is turned on coupling the center tap to the first output. During the forward portion of each cycle, the switch is turned off, isolating the outputs from each other.

Abstract: A primary voltage generation circuitry and an auxiliary voltage generation circuitry is provided to a DC-DC converter. The primary voltage generation circuitry generates a primary voltage output, and the auxiliary voltage generation circuitry, in cooperation with the primary voltage generation circuitry, generates an auxiliary voltage output. The primary voltage generation circuitry includes a switching circuit element and an inductor element, whereas the auxiliary voltage generation circuitry includes an inductor element complementary to the inductor element of the primary voltage generation circuitry. The inductor element of the auxiliary voltage generation circuitry references the primary voltage output, and relies on a minimum load at the primary voltage output. Preferably, the auxiliary voltage generation circuitry further includes reference circuitry elements for regulating the auxiliary voltage output to a precise assurance range.

Abstract: A high efficiency power supply for producing two regulated output voltages (i.e. 3.3 and 5 volts) from an unregulated input voltage. The supply includes a 4-15 volt battery pack, a first (5.0 volt) output, a second (3.3 volt) output, and a ground. The positive terminal of the battery is connected directly to the second output. The 3.3 volt differential with ground is maintained by a voltage regulator that couples the negative terminal of the battery pack to ground (i.e. ground floats relative to the battery). A second voltage regulator couples the positive terminal of the battery pack to the first output, and maintains this first output at 5.0 volts relative to ground. This latter regulator is capable of boost operation, permitting a 5.0 volt output to be maintained even if the battery pack voltage is less than this value. Neither regulator includes a transformer, making the supply particularly well suited for use in miniaturized equipment, such as palmtop computers.

Abstract: A power converter comprises a power stage including a transformer, a pulse width modulator (PWM) for controlling the power stage, multiple output circuits providing individually regulated voltages, including switches for coupling the output circuits sequentially and cyclically to the power stage, and feedback circuitry for supplying respective feedback signals, each for a respective output circuit, as a control signal to the PWM synchronously with the coupling of the output circuits to the power stage, so that a single PWM and power stage serve for multiple output circuits. The converter can be a dc to dc converter or a four-quadrant switching amplifier. The PWM operates in current mode in conjunction with a current sensing resistor or transformer.

Abstract: A power supply for a television apparatus, comprises a first source of unregulated DO run voltage operable only in a run mode of operation and a second source of unregulated DO voltage operable in a standby mode and in the run mode of operation. A first regulator responsive to the first source unregulated DO run voltage produces a first regulated voltage. A second regulator responsive to the second source of unregulated DO voltage produces a second regulated voltage. First and second integrated circuits are energized respectively by the first and second regulated voltages. At least one of the integrated circuits has a signal output coupled to a signal input of the other of the integrated circuits. A controller is operable in the run mode and responsive to variations of one of the regulated voltages for adjusting the other of the regulated voltages to follow the variations. Each of the regulators may comprise a series pass transistor and a control transistor coupled to a base of the series pass transistor.

Abstract: A tapped inductor slave regulating circuit provides a second slave output voltage derived from a tapped connection to the filter storage inductor of a first output voltage of a switching power supply converter. In the converter, an unregulated voltage is provided through a switching circuit to a storage inductor to develop a first output. The switching circuit is turned off and a synchronous rectifier is turned on to freewheel the current through the storage inductor and the load. The storage inductor is center-tapped and coupled to a switching circuit to provide a second slaved output. The location of the center tap is chosen to provide the proper voltage of the second output. In one embodiment, the switching circuit for the slaved output is turned on during the freewheel portion of each cycle to provide a proper voltage level for the second output. In another embodiment, a separate local feedback circuit is provided to further regulate the second output voltage level.

Abstract: Since a plurality of AC power supplies have output voltages controlled independently from each other and separate reference potential bus bars are connected with reference potential terminals of a plurality of DC power supplies connected with the different AC power supplies, respectively, power supply ripples contained in DC supplied to an electronic device can be reduced and it is possible to suppress generation of a beat produced by the fact that power supply ripples having frequencies deviated from each other interfere with each other. In this way fluctuations in the voltage of DC supplied to the electronic device are decreased and a working margin test for LSIs within the electronic device can be effected easily with a high reliability.

Abstract: An embodiment of the present invention is a switching power supply comprising a transformer with a primary and two secondaries, a switching transistor in series with the primary, a rectifier and filter on one secondary to provide regulated output power, a feedback control circuit that monitors the secondary and adjusts the duty cycle of an on-off control signal to the switching transistor to maintain a constant output at the terminals, and a monitor that detects when the power level flowing through the switching regulator has dropped to a predetermined minimum and then linearly turns on a load to the transformer. Transistor is typically a power MOSFET. The monitor tracks a summing junction current before any slope compensation is added. Load is a shunt regulator that is activated when the summing junction current falls below 12% of full scale. Alternatively, the predetermined value of 12% is adjustable.

Abstract: The disclosed invention regulates the voltage of an output terminal of a multiple output power supply. It operates by diverting current from one output terminal to another output terminal. The invention is less expensive than other alternatives, and has performance advantages over comparably priced alternatives. It may be used in various configurations to maintain an output voltage below a limit, above a limit, or within a range. Additional configurations may be used to regulate the voltages of multiple output terminals.

Abstract: Disclosed is an electrical control circuit (10) for controlling current through a plurality of resistive loads (14(1), 14(2) . . . 14(N)). The control circuit includes a plurality of current control stages (12(1), 12(2), . . . 12(N)), a comparator circuit (18), and a plurality of diodes D.sub.1, D.sub.2. . . D.sub.N-1 in serial connection with the current control stages. The comparator circuit controls the current that is drawn collectively through the loads. The diodes ensure that all preceding current control stages in the series are conducting a predetermined level of current before the next current control stage begins to source current through its respective load. Each current control stage includes an operational amplifier (30), a pass transistor (34), a sense resistor (R.sub.s), and a feedback resistor (R.sub.f). The operational amplifiers are a pre-drive to the pass transistors to allow smaller sense resistors to be used, thereby providing greater efficiency. The feedback resistors (R.sub.

Abstract: Each end of a power wiring is connected to a first or a second power supply circuit, respectively. These two power supply circuits are activated alternately allowing for some time-overlap. As a result, current flowing in the wiring changes its flowing direction alternately to prevent the degradation of the wiring due to the electro-migration phenomena.

Abstract: The present invention relates to electronic circuits, such as an operational amplifiers, which have dual power supply requirements. When the power supply voltages are switched between an "off" state and an "on" state, the power supply transient voltages of the two polarities closely track each othe so as to reduce audio transients from being produced within the operational amplifiers. This tracking is accomplished by the negative polarity power supply voltage being provided for the signal amplifier at the output terminal of an unity gain operational amplifier having an inverting input terminal coupled to the positive polarity power supply voltage.

Abstract: The switching power supply has high output power and high efficiency. The input voltage may be AC or DC. The input current may be constant or sinusoidal, output voltage fixed or variable. Smallest possible peak currents of switches result in best possible line and component utilizations at any time. In particular, inrush and surge currents are eliminated. A diode applies the input voltage to the output. A capacitor is coupled to the input for storing a base voltage. A switch selectively couples the capacitor to the output. A converter is used to convert the output voltage into the base voltage. The load is coupled to the output and further to the input or ground. A filter can be used to reduce output ripple voltage.

Abstract: The invention icludes a device for protecting electronic circuitry from damage, especially damage resulting from high neutron flux density produced by a nuclear explosion. The invention protects the circuitry by disabling its power supply system upon detection of the nuclear event. The power supply system is disabled both by short-circuiting the main power supply, which provides control voltages to various subsidiary powert supplies, and by short-circuiting all the output filter capacitors in the system, which may have a substantial residual charge. The invention periodically and automatically attempts to re-start the power supply system, but the system can be re-started only if the nuclear event detector is not actuated. The circuit made according to the invention is entirely analog, and therefore does not depend, for its operation, on the continued functioning of the circuitry to be protected.

Abstract: A voltage reference circuit maintains two nodes at constant voltages with respect to a reference by means of a tapped divider chain in parallel with a floating voltage reference circuit, both of which feed into the output node of a single differential amplifier. The reference circuit maintains a constant voltage across the divider chain and the amplifier floats the divider up or down to maintain a node in the chain at the reference voltage.

Abstract: A single constant voltage power supply concurrently supplies a plurality of independent loads each with an independently selectable constant current load without interaction between the loads (currents) by employing a plurality of parallel connected circuits of electrical lengths equal to (2n-1)90.degree. each connected between the constant voltage source and a different one of said loads.

Abstract: The power supply of the present invention is designed to operate over a wide range of both ac and DC input voltages and frequencies from 0-400 Hz. The power supply also provides two DC low voltage outputs, one for devices that do not require a high degree of regulation and one for devices that do require a high degree of regulation. The power supply also includes a power-up inrush clamp to limit high start up currents to approximately two times the nominal switching current. The primary switching transistor of the power supply is controlled by a dynamic feedback circuit which works interactively to increases the switching speed of the primary switching transistor.

Abstract: A coupled inductor type boost DC to DC converter with a single multipurpose magnetic component. The invention includes a conventional switch for converting an input DC voltage to a signal having a time varying waveform. The switch Q1 has a pole terminal connected to a source of input voltage, a control terminal and first and second throw terminals. The single inductive element includes a first winding LN.sub.1 connected between an output terminal of the switch and an input terminal of the converter and a second winding LN.sub.2 connected between the second throw terminal of the switch and an output terminal of the converter. In a first embodiment, the invention further includes a winding LN.sub.3 of the inductive element connected at a first end to the control terminal of the switch which provides a level shifting circuit for shifting the level of a drive signal applied to the control terminal of the switch.

Abstract: A switching regulator power supply has multiple regulated and isolated voltage outputs. This is accomplished without the use of separate voltage regulators for each output voltage or extra transformer windings in the input circuitry of the power supply. Instead of an inductor, the primary winding of a transformer is used as the inductive component required in switching type regulators and is connected in series with the first output voltage. The secondary winding provides an isolated second output voltage. The primary to secondary turns ratio of the transformer determines the magnitude of the voltage.