Abstract: An integrated circuit of the present invention includes power regulating circuitry for reducing preregulator bias current. In one embodiment, power regulating circuitry includes a two stage preregulator for supplying current to a charge pump and a primary regulator. The first stage includes a high power operational amplifier for quickly establishing substrate bias and other pumped voltages before primary voltage is coupled to the remainder of the integrated circuit. Preregulated and pumped voltages are used to establish a reference voltage for the primary regulator. The second stage preregulator includes a low power series regulator to power the charge pumps and so maintain the reference voltage. When the primary regulator has generated the primary voltage level, the power regulating circuitry couples the primary voltage to the remainder of the integrated circuit and disables the first stage preregulator.

Abstract: A protected switch has a power first semiconductor device having a first main electrode for coupling to a first voltage supply line, a second main electrode coupled to a first terminal for connection via a load to a second voltage supply line and an insulated gate electrode coupled to a control terminal for supplying a gate control signal to enable conduction of the power semiconductor device. A control arrangement has a normally off second semiconductor device having first and second main electrodes coupling the normally off semiconductor device between the gate electrode of the power semiconductor device and one of the first and second main electrodes of the power first semiconductor device and a control electrode coupled via a resistance to the gate electrode of the power semiconductor device thereby causing the normally off semiconductor device to be rendered conducting when a gate control signal is supplied to the gate electyrode to enable conduction of the power semiconductor device.

Abstract: A multi-output switching power unit which can substantially prevent an output power supply of an auxiliary output power circuit from dropping significantly when a load a is light and which has a reduced loss in the output path. A voltage up capacitor 20, a first diode 21, a second diode 22 and a series regulator 13 are provided in the auxiliary output power circuit 9 including a choke rectifier circuit 4. When the load a is light and an output voltage V2 of the auxiliary output power circuit 9 drops to below the predetermined voltage of the series regulator, the series regulator 13 is put into a conductively connected state.

Abstract: A direct current (dc) overvoltage, pre-regulation circuit regulates dc voltage supplied to a cable television line amplifier. The circuit provides overvoltage protection while permitting continuous operation of the line amplifier. The circuit opens the input to the downstream continuous voltage regulation circuit and cyclically charges a filter storage capacitor by periodic applications of the un-clipped voltage. The repeated switching regulates the dc voltage such that operation is sustained during periods of overvoltage that would normally shut down conventional circuits. No overall feedback is required to control the active device.

Abstract: A step-up DC/DC voltage convertor is coupled to a step-down DC/DC voltage convertor via a capacitor, which stores energy and maintains power flow to an output load circuit during a brief interruption of power supplied to the input of the step-up convertor. A diode connected to the capacitor prevents energy stored within the capacitor to be fed back to the step-up voltage convertor during the power interruption.

Abstract: This invention relates to regulation techniques for alternators typically permanent alternators as might be used on recreational vehicle engines. The regulation techniques previously known under some conditions produce undesirable high direct current components or unbalanced currents in the alternator winding on the alternator. The invention reduces these unbalanced currents thus eliminating the unnecessary source of heating of components and the waste of power. Alternator regulators of the type commonly used on AC systems on snowmobiles typically have a negative temperature coefficient which produces excessive voltage at low temperatures which further adds to effectively increased voltage at the lamps caused by the reduction in wiring resistant at low temperature. The invention produces a selected positive temperature coefficient of a true RMS AC regulator and allows more accurate calibration of that regulator.

Abstract: In a circuit arrangement for regulating the load current of a power MOSFET, the drain-source voltage of the power MOSFET is imaged onto the input of a second MOSFET connected between a gate terminal and source terminal of the power MOSFET. When the input voltage exceeds the cut-off voltage, then the gate-source voltage at the power MOSFET is regulated back to a value that corresponds to the sum of the cut-off voltages of the second MOSFET and a third MOSFET. The gate terminals of third MOSFET and the power MOSFET are connected to one another.

Abstract: A synchronous step-down DC to DC converter includes a bootstrap capacitor monitored by a controller for maintaining a desired bootstrap voltage to drive a high side NMOS switch. The controller temporarily increases the duty cycle of the low side NMOS switch when the bootstrap voltage decreases below a predetermined level to maintain a minimum level of charge on the bootstrap capacitor.

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: Magnetic amplifier post regulator (54) includes magnetic amplifier (42) that has a main magnetic amplifier winding, reset transistor (76), error amplifier (58), and auxiliary magnetic amplifier winding (220). Magnetic amplifier (42) controllably blocks a portion of the input voltage N.sub.s /N.sub.p V.sub.IN from winding (30) of transformer (18) in response to a controlled resetting condition and produces therefrom a magnetic amplifier output voltage (v.sub.2). Auxiliary output circuit (14) uses the magnetic amplifier (42) output voltage (v.sub.2) to produce the desired auxiliary output voltage (V.sub.OS). Reset transistor (76) controls reset current to magnetic amplifier (42) in response to an error signal from error amplifier (58). Error amplifier (58) compares auxiliary output voltage (V.sub.OS) to predetermined reference voltage (66) and generates the error signal from the comparison. Auxiliary magnetic amplifier winding (220) has a predetermined number of turns (N.sub.

Abstract: A direct current or direct voltage power supply operating from a mains AC line is corrected for power factor so that the maximum power can be extracted from the source. The AC line is full-wave rectified, filtered and the resulting pulsating direct voltage is applied to a buck/boost switched inductor switched at a frequency higher than the line frequency. The buck/boost switching action is controlled so that the switchover between buck and boost modes occurs when the instantaneous value of the pulsating direct voltage equals the supply output voltage. The inductor current in the buck mode of operation is controlled to have an input voltage-squared characteristic; the inductor current in the boost mode is controlled to have an input voltage-proportional characteristic. The resulting average current makes the AC line current substantially proportional to the AC line voltage, to achieve substantially unity power factor.

Abstract: An isolated switching dc-to-dc converter is provided with a novel open-loop input voltage regulation on the primary side and the full regulation and independent protection of each of multiple outputs on the secondary side using an auxiliary circuit comprising a current bidirectional switch Q.sub.a and a capacitor C.sub.a on the primary side in a series circuit connected in parallel with a main current bidirectional switch Q to assure a continuous conduction mode for operation of the primary boost-like converter, and consequently preserves the simplicity of open-loop input voltage regulation for all loads from no load to full load. The auxiliary switch Q.sub.a is very efficient with only a fraction (5% or less) of the losses of the main active switch Q. The ideal dynamic response approaching theoretical limits is achieved for both line and load transients together with a high efficiency (85%) and record power density (20 W per cubic inch) for multiple output converters.

Abstract: An integrated circuit of the present invention includes power regulating circuitry for reducing preregulator bias current. In one embodiment, power regulating circuitry includes a two stage preregulator for supplying current to a charge pump and a primary regulator. The first stage includes a high power operational amplifier for quickly establishing substrate bias and other pumped voltages before primary voltage is coupled to the remainder of the integrated circuit. Preregulated and pumped voltages are used to establish a reference voltage for the primary regulator. The second stage preregulator includes a low power series regulator to power the charge pumps and so maintain the reference voltage. When the primary regulator has generated the primary voltage level, the power regulating circuitry couples the primary voltage to the remainder of the integrated circuit and disables the first stage preregulator.

Abstract: A method and an apparatus of an internal voltage down converter having good transient response characteristics and small chip real estate, includes a differential amplifier for comparing a voltage on an internal power supply line with a reference voltage, a MOS transistor for generating an internal supply voltage from an external supply voltage, by receiving the output of the differential amplifier at the gate, and a feed back capacitive element provided between the internal power supply line and the gate of the MOS transistor.

Abstract: A switching transistor is arranged for charging a capacitor in response to a positive going transition of a clock signal. The charging time of the capacitor is determined by controlling the charging current in accordance with an input voltage to a transistor coupled to the capacitor. The pulse width of an output signal is dependent upon the charging time of the capacitor. Using the inventive pulse width modulator, by comparing the voltage of a reference voltage source with a divided voltage obtained through feedback of the output of the pulse width modulator, a switching power source is obtained by simply adding circuitry for converting, rectifying and smoothing the output voltage. A variable range of pulse width of up to 1800 times can be obtained. When the circuit is designed using complementary MOS devices, the operating voltage can be under 1V with a consumption current of less than several .mu.A.

Abstract: A measuring and control circuit for measuring the voltage of an alternating current source and controlling the operations of an associated load. A memory associated with the microprocessor is programmed to provide information representative of voltage levels associated with various modes of operation associated with the load. Tested levels are compared with programmed voltage levels to determine needed load control.

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 power converter which includes a bridged power amplifier powered from a sole or single DC input power source through a plurality of parallel connected PWM buck converters. The converters are modulated with reference signals which operate in time alternation such that in any conversion cycle there exists a plurality of modulating wave forms which are identical except for their time delays and which are evenly spaced in time over a single conversion cycle. A feedback control amplifier compares the voltage output of the parallel connected converters through the magnitude of the amplifier's required supply voltage and drives the modulating components of the circuit to control the switching duty cycle of each of the individual PWM converters.

Abstract: A method and apparatus for reducing the effects of ground float upon electrical signal measurements in an electronic control system. The signals are measured with respect to a virtual ground rather than signal or chassis ground, where the virtual ground provides a regular and reliable signal level regardless of circuit electrical variances.

Abstract: A telephone line power utility circuit, in which direct-current power supplied through a telephone line-side is utilized as a power source for a line terminal device having a direct-current resistance, the telephone line power utility circuit including a DC-DC converter connected with the line terminal device for supplying the direct-current power to the line terminal device, the DC-DC converter having an input direct-current resistance; and a central processing unit (CPU), connected with the DC-DC converter, for obtaining a maximum input direct-current resistance of the DC-DC converter to increase the efficiency of receiving power of the DC-DC converter by allowing the direct-current resistance of the line terminal device, viewed from the telephone line-side, to satisfy a predetermined standard, controlling the duty ratio of the primary side switching element, and/or switching the taps of the primary side winding of the transformer of the DC-DC converter, such that the direct-current power supplied through t

Abstract: A capacitance multiplier/regulator (FIG. 1) stores charge at high voltage across a capacitor (22,32), and capacitance-multiplies current to a load (100) by step-down transformers (26,36), controlled switches (24,34), and rectifiers (28,38). The switch pairs (24a,24b;34a,34b) each switch in antiphase, but the switching phase between the pairs is controlled (FIG. 5) in a feedback manner to controllably generate a voltage across a transformer primary winding (14.sub.p), which couples a feedback-controlled alternating voltage across secondary winding (14.sub.s). The alternating voltage is added to the unregulated voltage by a rectifier (18,20), so the bus voltage is controllably greater than the unregulated input voltage. The feedback controls either the bus voltage or the load voltage. Stress on the switches is reduced by preventing capacitor recharge during a load pulse.

Abstract: A regulated power source for supplying power to a circuit, the power source including a regulated power converter generating an output voltage for the circuit, the converter including a control terminal through which the output voltage can be regulated by feedback from the circuit; a monitoring circuit including a plurality of input terminals each of which monitors a voltage at a different location on the circuit, the monitoring circuit producing a control signal that is a function of all of the monitored voltages at the plurality of input terminals, the control signal driving the control terminal of the regulated power converter so as to regulate the output voltage to maintain the control signal at a constant value.

Abstract: An integrated circuit of the present invention includes power regulating circuitry for reducing preregulator bias current. In one embodiment, power regulating circuitry includes a two stage preregulator for supplying current to a charge pump and a primary regulator. The first stage includes a high power operational amplifier for quickly establishing substrate bias and other pumped voltages before primary voltage is coupled to the remainder of the integrated circuit. Preregulated and pumped voltages are used to establish a reference voltage for the primary regulator. The second stage preregulator includes a low power series regulator to power the charge pumps and so maintain the reference voltage. When the primary regulator has generated the primary voltage level, the power regulating circuitry couples the primary voltage to the remainder of the integrated circuit and disables the first stage preregulator.

Abstract: This invention provides an AC-DC converter in which the shape and the cost do not increase by a measure for a harmonic distortion in the power factor improved AC-DC converter generating little harmonic distortion. In the AC-DC converter, a control input terminal of a switching transistor of an active filter is connected to an output terminal of a flip-flop, a set input terminal of which is connected to a DC-DC converter to receive a synchronizing pulse signal therefrom. A reset input terminal of the flip-flop is connected to an output terminal of a comparator to receive an OFF-timing signal from the comparator. The comparator determines OFF-timing of the switching transistor by comparing a level voltage with an outout voltage from a saw-tooth wave generating circuit. Thereby since it is not required that an active filter has a multiplier and an an oscillating circuit, its circuit construction is simple and the AC-DC converter in small size and at low cost is realized.

Abstract: Synchronous switching inverter and regulator suppress rf emissions, and FET push-pull switching for the inverter provides high efficiency power transfer by sinusoidal transformer operation. Feedback control for both pass transistors switching and duty cycles insures overall synchronous behavior.

Abstract: A high efficiency, linear DC power supply circuit includes a pulse width modulator stage for reducing a higher DC source voltage to a lower DC operating voltage at high efficiency, an energy storage device, a linear voltage regulator, and a feedback circuit. The feedback circuit monitors the voltage across the linear voltage regulator and sends a frequent or continuous feedback signal to the pulse width modulator to maintain a relatively fixed voltage across the linear regulator regardless of nominal variations in source voltage, operating temperature, load current, noise, or other shifting parameters. By monitoring only the voltage across the linear regulator, a significant enhancement in performance of the power supply circuit is realized.

Abstract: Output voltage of a switching regulator is rectified and adjusted by the internal body diode of an FET. When the output voltage exceeds a reference voltage, the FET is gated off, causing the internal body diode to reduce the output voltage by a diode drop. When the FET is turned on, the diode is shorted and, as a result, the output voltage is increased by a finite amount of additional energy. This adjustment range, a diode drop, is significant for low voltage, wide bandwidth power supplies.

Abstract: A distributed power system for providing multiple output voltages, including pulsed voltages, to a solid-state phased-array radar transmit/receive module, for example, includes: an energy-storage capacitor for coupling to an input dc power source and for storing substantial energy at high voltage for supplying pulsed voltages at low voltage; at least one capacitance-multiplying converter, including first and second transformers with multiple secondary windings, for producing positive and negative voltages on buses internal to a power module; and a plurality of series regulators to obtain multiple positive and negative load voltages, including pulsed voltages, from the positive and negative bus voltages. Substantial energy storage is achieved within the power module; and, if even more energy storage is desired, an additional external energy-storage capacitor can be coupled to the input power leads, thereby being coupled in parallel with the energy-storage capacitor.

Abstract: The present invention relates to a hybrid power supply for converting an alternating input signal fed to its input into a direct output signal produced at its output. The hybrid power supply comprises a rectifier for converting the alternating input signal into a mono-alternation signal; a capacitor for smoothing the mono-alternation signal into a direct signal; a switching regulator stage coupled to the capacitor for generating a pre-regulated direct signal having a constant amplitude; a 1/X frequency modulating circuit for generating two switching pulsed signals of constant pulse width at a variable frequency according to a 1/X function in relation to the direct signal originating from the capacitor; and a linear regulator stage coupled to the switching regulator stage for regulating the pre-regulated direct signal, and for generating the direct output signal.

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: A voltage converter is provided comprising a primary circuit which, with an input voltage, is connected through at least one primary winding to at least one respective secondary winding of at least one secondary circuit. The primary circuit and the at least one secondary circuit are tuned individually so that each comprises an oscillatory circuit with coinciding resonance frequencies.

Abstract: A power supply circuit includes a cascade arrangement of a full-wave rectifier and a first and a second switched voltage converter. The input terminals of the first voltage converter receive a rectified supply voltage. The second switched voltage converter has input terminals connected to a first storage capacitor of the first voltage converter. The second voltage converter includes the output terminals of the power supply circuit. A control circuit controls the period of conductance of the controlled switches of the switched voltage converters with a switching period which is much shorter than the cycle period of the AC supply voltage. A first inductive element is connected via a first controlled switch across the output terminals of the full-wave rectifier during a part of the switching period.

Abstract: A voltage and frequency converter device for converting a primary voltage and frequency from an electrical supply to a secondary voltage and frequency particularly useful in powering the timing mechanisms in appliances made to operate at the secondary voltage and frequency, includes a rectifier circuit for converting the alternating current oscillating at the primary frequency to direct current, circuitry for causing the current to oscillate at the second frequency and for converting the primary voltage to the secondary voltage. The output of the converter is preferably coupled only between the power source and the timing circuitry of the appliance but may also be coupled to the power circuitry for motors and the like provided the converter is further configured to generate a true sine wave output.

Abstract: A voltage regulator is provided for producing a predetermined output voltage level. The voltage regulator has a voltage source for providing a plurality of successively increasing voltage levels at a corresponding plurality of output terminals, or taps. A controller is provided for automatically selecting, in response to an electrical control signal, the one of the taps providing a voltage level above the predetermined output voltage level. In a preferred embodiment of the invention, the selected tap is the one of the plurality of taps producing a voltage level closest to, and greater than, the predetermined output voltage level. With such an arrangement, the electronic control signal allows a convenient way to select an output voltage level closest to, and greater in magnitude than, the predetermined voltage level, thereby improving the efficiency of the regulator.

Abstract: A AC to DC power converter unit includes an AC/DC converter section operable to convert an AC input into a plurality of unregulated internal DC outputs and a pair of positive and negative switching DC/DC converter sections connected to said AC/DC converter section and receiving a pair of positive and negative unregulated internal DC outputs therefrom being of a first voltage level and generating a pair of dual positive and negative regulated external DC outputs being of a second voltage level different from said first voltage level.

Abstract: A half-bridge inverter circuit is provided for converting a DC voltage source to an AC voltage waveform, and supplying the AC voltage waveform to a load. The half-bridge inverter includes an inverter comprising a first capacitor for supplying a positive output voltage and a second capacitor for supplying a negative output voltage during respective intervals of the output waveform. An equalizer, responsive to a control circuit, equalizes the voltage output from the first capacitor and the second capacitor in order to overcome non-symmetry of these voltages resulting from a non-symmetrical load.

Abstract: A DC to DC converter employs a single ended blocking oscillator which employs a transformer having a primary winding and a plurality of secondary windings. The transformer has a core which is of a square loop hysteresis type. The blocking oscillator is supplied operating voltage by means of a voltage regulator circuit which operates to regulate the voltage applied to the blocking oscillator according to both input voltage variations and output load variations. Due to circuit operation, the output voltage is extremely well regulated while having low ripple. An output secondary winding of the transformer is coupled to a rectifier. The rectifier output is fed back to the regulator to control the voltage applied to the blocking oscillator to cause the blocking oscillator to provide a waveform to maintain the output voltage constant.

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: Feedback resistors including a dividing resistor are provided at the output terminal of a switching regulator to divide an output voltage supplied by the switching regulator. The terminals of at least one of the feedback resistors are connected to the collector and emitter respectively of a transistor, and the base of the transistor is supplied with a control signal which can be output, for example, from a controller. The transistor is switched ON in response to the control signal when a load requiring a high operating voltage, such as, for example, a printing unit is not operated, thereby causing the switching regulator to generate a low target voltage which is then used to generate a low operating voltage by a linear regulator (for powering loads requiring the low operating voltage). The transistor is switched OFF in response to the control signal when the load requiring the high operating voltage (e.g.

Abstract: The voltage regulator of the boosting/lowering type is comprised of a switching regulator block and a series regulator block, which are cascade-connected to each other. One input terminal of an error amplifier of the switching regulator block is connected to a dividing node of bleeder resistors in the series regulator block to constitute a regulative feedback loop effective to improve an efficiency of the voltage regulator.

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: An implant for stimulating the vagus nerve receives commands over a radio frequency link. The communication protocol uses asynchronous communications devices with parity checking and echoing of communicated characters and passwords to improve communication error checking. The implant disables a voltage convertor used in providing the stimulation signal at periodic intervals to monitor for communications attempts. The implant provides radio frequency marker pulses before providing stimulation signals of certain frequencies. During the providing of stimulation signals the implant monitors the voltage overhead present between the voltage source and the load and adjusts the overhead to a desired level. The implant changes the voltage applied to certain internal components during stimulation periods to allow full power operation during those intervals and reduced power levels at other intervals.

Abstract: In a compensating arrangement for a disturbed load voltage (V.sub.2, FIG. 3) of a remotely located load (20), the load voltage is fed back and combined with the voltage (E.sub.osc) of an oscillator (10A) to form an error signal (E.sub.X). The error signal is stored for a period less than one cycle of E.sub.osc by a selected period (T) and combined with the oscillator voltage (E.sub.osc) to be amplified and produce a modified output voltage (V.sub.O). The latter, when fed to the load through a distribution system (15) results in the waveform of the load voltage (V.sub.L) being substantially identical to that of the oscillator voltage (E.sub.osc).

Abstract: A DC-DC power converter adaptable for use with an AC input, uses feed forward control of the output power to control the input power and the dynamic resistance of the input to ensure a high power factor in the AC input embodiments of the converter. The dynamic response of the power converter is controlled by feed forward, either through scheduling the energy content of a storage capacitor as an explicit function of the output power, the input voltage and the time constant, or through energy deficit feed forward in which the energy deficit caused by a transient is fed forward as an increment of power under feed forward control. Line frequency ripple feed forward compensates the feed forward in the embodiments having an AC input for any half frequency harmonics present in full wave rectified input due to a DC offset or asymmetry in the AC input. With load anticipation feed forward control, input power transitions smoothly without overshoot for a step change of output load from no load to full load and back.

Abstract: Magnetic direct current to direct current converter with the input isolated from the output. A pulse generator from the feedback is incorporated in the feedback circuitry to regulate the output relative to the input.

Abstract: A DC-DC power converter cell is disclosed which incorporates novel control circuits that operates the cell at efficiencies of 88%. This cell also has control-in and control-out terminals whereby multiple cells are intercoupled to operate in synchronization with each other as a versatile system of cells. Manufacturing cost is reduced by utilizing a simply configured single-turn high-frequency transformer in each cell, and by operating at efficiencies that reduce cooling requirements.

Abstract: A DC to DC converter employs a push-pull oscillator which employs a transformer having a primary winding and a plurality of secondary windings. The transformer has a core which is of a square loop hysteresis type. The push-pull oscillator is supplied operating voltage by means of a voltage regulator circuit which operates to regulate the voltage applied to the push-pull oscillator according to both input voltage variations and output load variations. An output secondary winding of the transformer is coupled to a full wave rectifier. The full wave rectifier output is fed back to the regulator to control the voltage applied to the push-pull oscillator via the regulator. Due to circuit operation, the output voltage is extremely well regulated while having low ripple.

Abstract: A power supply module for control electronics of a DC motor, the module comprising a power cell of the stepdown type controlled as a function of peak current, the current flowing in both directions, and the module including a bridge stage likewise capable of passing current in both directions and including a reactive element constituted by one of the windings of the DC motor. The invention is particularly suitable for space applications.

Abstract: A voltage-regulating circuit comprises a series voltage stabilizer which includes a regulation element (Q.sub.1) arranged in series with an output for supplying an output voltage to a load (Z.sub.L). A comparison circuit (Q2-Q7) control the regulation element. The comparison circuit has a first input connected to a reference-voltage circuit (T3, D1) and a second input for receiving at least a part of the output voltage of the series stabilizer. A parallel stabilizer (D2) is arranged in parallel with the output of the series stabilizer. The parallel stabilizer is adapted to generate an output voltage equal to that of the series stabilizer.

Abstract: An apparatus which connects/disconnects battery from a load such as a computer system includes a first circuit arrangement which sets a first reference voltage level at which the energy source is connected through an FET device to the computer system, a second circuit arrangement that sets a second voltage level at which the energy source is disconnected by the FET device from the computer system and a third circuit arrangement which controls the FET device so that said FET device is forced into either its ON or OFF state once one of the reference voltages is reached. A second apparatus which reduces power dissipation in a battery charger power device by forcing the input voltage to track the battery voltage as the battery charges/discharges.