The present invention relates to a converter secondary circuit having a main output (2) and an auxiliary output (7), the secondary circuit comprising a first synchronous rectifier that is self-controlled and generates a rectified voltage for the main output (2), and said auxiliary output including a second synchronous rectifier receiving at its input said rectified voltage and being regulated by an auxiliary regulation control circuit (8) having a synchronization input (8B). According to the inv...

A DC-DC converter circuit includes a transformer with a resonate filter or snubber connected at a primary side and a switch for controlling operation of the converter. A secondary side of the transformer includes self-driven synchronous rectifiers and an output filter. Transistors are provided at the gates leads of the rectifiers and themselves are provided with a fixed voltage at their gates so as to clamp the peak voltages across to the rectifiers.

A controllable rectifying element, comprising a bipolar transistor having a current input terminal connected to a control terminal by a first switch and having a current output terminal connected to the control terminal by a second switch, the turn-off and turn-on phases of the first and second switches being complementary and depending on the state desired for the rectifying element.

An alternator system having an alternating current voltage source includes a rectifier coupled to the voltage source, a sensor coupled to the voltage source and an engine and a control circuit coupled to the voltage source, the rectifier and the sensor. The control circuit provides control signals to the rectifier and the voltage source. The alternator system further includes a fault protection controller coupled to an output of the alternator system and coupled to the control circuit. The recti...

A rectifier circuit which uses transistors, is unaffected by changes in ambient temperature and frequency, and shows a linear relation between input AC and output DC. In the invention, the diode or diodes of a rectifier circuit are replaced by the emitter-collector path of a transistor (Q) and the base electrode of the transistor is connected to one of the output terminals 3 by means of a resistor R1 having a high resistance compared to the base input resistance of the transistor.

A polyphase source of alternating current is converted to a low voltage high current regulated d.c. in a manner to conserve power and reduce costs by reduction of the number of components required therefor. To achieve this end, a single transistor is employed for each phase of the polyphase input transformer secondary winding configuration which transistor acts to perform the dual function of providing both rectification and regulation of the a.c. input.

This invention discloses rectifying circuits using normally "off" Junction Effect Transistor. By connecting the gate of the JFET to the higher bias terminal of the output coil of the transformer, the forward biased turn on function of the normally "off" JFETs can be achieved. Therefore, the normally "off" JFET can be used as synchronized zero voltage switching rectifier with very low voltage drop. Since normally "off" JFET is a majority carrier device, very high frequency response can be achieve...

A synchronous rectification circuit for power converters operable under fixed and/or variable frequencies where no current sense circuit or phase-lock circuit are needed is provided. It has a power switch coupled to a transformer for the rectification. A signal-generation circuit is used for generating a control signal in response to a magnetized voltage of the transformer, a demagnetized voltage of the transformer, and a magnetization period of the transformer. The control signal is coupled to ...

This invention describes a method for using self-synchronized (also known as self-driven), synchronous rectifiers in converters employing high output voltages or conversely, in converters with wide input voltage ranges.

A four terminal full wave rectifier circuit that can be used as a pin for pin replacement for the full wave diode rectifier circuit commonly used in DC power supply circuits. Two full wave rectifier circuits that can efficiently supply the DC currents required in both discrete and integrated circuits being operated at low DC supply voltages are disclosed. Both circuits utilize two n-channel, enhancement mode Junction Field Effect Transistors (JFET) and two p-channel, enhancement mode Junction Fi...