Abstract: A multiplexing power converter for use with a single inductor for providing multiple power outputs is disclosed. The multiplexing power converter includes first switching means for providing a first low resistance path for current to flow from a power source through an inductor so as to energize the inductor, and at least one second switching means for providing at least one second low resistance path for current to flow from the inductor so as to deenergize the inductor and provide an output current. Only one low resistance current path is provided at any one time.

Abstract: An HVDC transmission including at least two converters. Each converter is adapted for connection between a three-phase alternating-voltage network. At least a first converter has ac leads for connection of the first converter to the alternating-voltage network without the use of a separate winding transformer. A dc link is common to the converters. A zero-sequence inductor connection is arranged in the ac leads of the first converter and designed such that the zero-sequence inductor connection exhibits a high impedance to zero-sequence currents and a low impedance to positive-sequence currents.

Abstract: A multiple value voltage output circuit in which the number of transistors configuring a high breakdown voltage circuit portion can be reduced so that the area for forming the circuit is reduced. In a signal electrode driving circuit 11, an inverted AC-converting signal FRR inputted to switching control circuits 12 and 13 is selectively inputted to transistors 41 to 44 of an output buffer 14, on the basis of a data signal DA, thereby make one of the transistors 41 to 44 conduct so that a voltage corresponding to the turned-ON of the transistors 41 to 44 is outputted through an output terminal 15.

Abstract: A generating apparatus for a vehicle is composed of an AC generator, a battery and a rectifying bridge circuit. The bridge circuit is composed of high-side elements and low-side elements. One of the low-side rectifying elements which is connected to an armature coil generating the giant-pulse-voltage is turned on to circulate the giant-pulse-voltage in the armature coils, thereby suppressing the giant-pulse-voltage.

Abstract: A circuit for generating a reference voltage and detecting a drop in a supply voltage, comprising at least one threshold comparator having an input terminal and an output terminal, and a voltage divider connected between a first supply voltage reference and a second voltage reference and connected to the input terminal of the comparator, further provides for the output terminal of said comparator to be connected to the input terminal through at least one feedback network comprising at least one current generator. The feedback network further comprises a buffer block having an input terminal connected to said comparator and a first output terminal connected to a switch which is connected between a circuit node of said voltage divider and the second voltage reference.

Abstract: A method for reducing the transient response time of a voltage regulator when the load attached to it is entering or exiting a lower power consumption level by changing the bandwidth of the voltage regulator without compromising its stability, and a bandwidth regulator for implementing such a method are disclosed, wherein the bandwidth of the voltage regulator is changed based on a signal sent by a control device when it senses that the component is about to change power consumption levels.

Abstract: Flexible power converters in which many different output power configurations (i.e., different output voltages and currents) may be realized. In particular, a flexible power converter having an output stage configurable as a full bridge having series or parallel secondary windings, a current doubler having series or parallel secondary windings, or a voltage doubler having series or parallel secondary windings.

Abstract: Input-voltage-controlled pulse generator (VCO-PWM) for driving a pulse converter or switch-mode power supply with a variable duty ratio and a fixed maximum test level and variable clock frequency.

Abstract: The invention relates to static electric power conversion using semiconductors using soft switching in zero-voltage mode and controlled to perform pulse width modulation, having a first interface (L, C, T.sub.a, D.sub.a) in series between a DC voltage input (E) and a converter (1), and with a second interface (2) connected to the connection between the first interface and the converter (1) and organized, immediately before the end of a voltage window of amplitude (1+k)E to cause a positive current to flow through the switch (T.sub.a,D.sub.d) to counter the input current of the converter (1) which is negative when the ripple current flowing through the inductor is at its minimum value so as to reduce the current ripple amplitude required for switching off the switch (T.sub.a, D.sub.a), thereby reducing the current ripple for controlling interruption of the short circuit provided by the branch(es) of the converter (1).

Abstract: A power supply apparatus has a rectifier for outputting a non-smoothed DC. A switching circuit alternately shut off output of the rectifier at a high frequency, which includes first and second switches. A first capacitor couples to the first and second switches for smoothing output of the rectifier. A series resonance circuit includes a second capacitor and an inductor so that the voltage across the first capacitor becomes lower by the resonance voltage than that of the output of the rectifier. The switches are coupled to a feedback circuit including a saturatable current transformer having a primary winding and secondary winding. A control means varies the saturation time of the saturatable current transformer.

Abstract: An LC resonant circuit. The resonant circuit includes a resonant capacitor and a transformer. The transformer comprises a magnetic core having a primary winding, secondary winding and control winding wound on the core. The primary winding is loosely coupled with the secondary winding. The resonant capacitor of the circuit is connected in series with the primary winding of the transformer. The control winding saturates the core in response to the application of direct current thereto to control the output of the resonant circuit.

Abstract: A rectifier module assembly for a conventional three phase AC generator is formed into two crescent shaped rectifier modules so that the rectifier assembly can be mounted directly to the housing of the exciter rotor. The positive and negative rectifier modules are thermally conductive so that the exciter rotor itself can act as a heat sink for the rectifier module assembly. The rectifier module assembly occupies the space between and around the generator shaft and the exciter rotor windings.

Abstract: An uninterruptable power supply module includes a DC power supply having an output for outputting a first DC voltage signal, a battery backup module in parallel connection to the output of the DC power supply and having an identical voltage level to that of the first DC voltage signal, boost converter means having an input coupled to the first DC voltage signal from the battery backup module for converting said first DC voltage signal to a second DC voltage signal, DC/AC conversion means having an input coupled to the second DC voltage signal from the boost converter means and an output for generating a first AC voltage signal in response to a variable duty cycle oscillation signal, pulse width modulator means powered by said battery backup module and having an output coupled to said DC/AC conversion means for generating said variable duty cycle oscillation signal, and shaping means having an input coupled to the first AC voltage signal from the DC/AC conversion means and an output for supplying a second AC v

Abstract: This invention relates to an electronic device for the conversion of electric energy between a voltage source E and a current source J. This device is comprised of cascaded switching cells (CL.sub.k) each having two switches (I.sub.Ak, I.sub.Bk) and comprising capacitors (C.sub.k) associated with the cells for distributing the voltage of the source over the switches, and control logics (LG.sub.k) which condition the exchanges of energy and are synchronized for limiting the voltage supported by each switch to a fraction (V/n) of the supply voltage, for limiting the ripple amplitude of the voltage of the output to the same fraction V/n and for conferring on this ripple voltage a frequency (nF) which is a multiple of the switching frequency (F) of the switches.

Abstract: A bidirectional buck boost converter and method of operating the same allows regulation of power flow between first and second voltage sources in which the voltage level at each source is subject to change and power flow is independent of relative voltage levels. In one embodiment, the converter is designed for hard switching while another embodiment implements soft switching of the switching devices. In both embodiments, first and second switching devices are serially coupled between a relatively positive terminal and a relatively negative terminal of a first voltage source with third and fourth switching devices serially coupled between a relatively positive terminal and a relatively negative terminal of a second voltage source. A free-wheeling diode is coupled, respectively, in parallel opposition with respective ones of the switching devices. An inductor is coupled between a junction of the first and second switching devices and a junction of the third and fourth switching devices.

Abstract: A power-factor-corrected switching power supply includes a power-factor-corrector cell followed by a current-fed dc/dc converter cell. Both cells operate in discontinuous current mode. A duty cycle modulator has its input coupled to the output of the current-fed dc/dc converter cell and its output coupled to the switch control inputs of both the PFC cell and the current-fed dc/dc converter cell so that both cells receive the same control signal.

Abstract: An AC-to-DC converter and regulator normally receives power from an AC utility line and provides a stable DC output to a load, such as the power amplifier and transmitter of a cell site. The DC output, or a separate dedicated output from the converter, is used to charge a backup battery when AC power is available. If AC power is interrupted, the backup battery provides power to the load by way of a separate DC-to-DC differential converter. The battery is connected in parallel with the differential converter input, but in series with the differential converter output. Thus, the differential converter receives operating power from the battery, and outputs a voltage which is summed with the battery output to drive the load. A control circuit for the differential converter senses the voltage provided to the load, and supplies a signal to the differential converter to adjust its output as necessary to maintain the optimum aggregate output to the load.

Abstract: In a power inverter, ripple current and bulk filtering are provided by a high-current, high-microfarad film capacitor arrangement; there is no separate snubber capacitor section. In an alternative embodiment, a small high-frequency film capacitor is connected in parallel with the bulk film capacitor arrangement, thereby increasing the operating range of the circuit.

Abstract: An output driver for providing a gate voltage to an external positive-channel field-effect transistor (PFET) device. A capacitor accumulates charge which, upon switching by an input switching signal, is applied, in addition to the supply voltage, to the base of a drive circuit NPN transistor to rapidly pull the PFET gate voltage, derived at the emitter of the drive circuit NPN transistor, up to the supply voltage. An active voltage limiter, coupled in parallel with the drive circuit, limits excursion of the gate voltage with respect to the supply voltage.

Abstract: A pulse width of a pulse train signal used for PWM (pulse width modulation) control is monitored. When a variation of the pulse width substantially disappears within a specified time, it is determined that an operating point on an output characteristic curve of a photovoltaic array is located on the open-circuit voltage side of a maximum power point. When the variation of the pulse width does not disappear after the elapse of the specified time, it is determined that the operating point is located on the short-circuit current side of the maximum power point. Based on the determination result, the inverter control is performed such that the operating point follows the maximum power point.