Abstract: A DC-to-DC converter is coupled to an AC source comprising a rectifier bridge. An input inductor is coupled to the output of the rectifier stage. An auxiliary winding is coupled to the input inductor. The auxiliary winding is characterized by a first number of turns. A storage capacitor is coupled to the auxiliary winding. An output transformer is coupled to the auxiliary winding. A first switch is coupled in series with the primary of the output transformer. The first switch and primary are coupled in parallel with the storage capacitor to the auxiliary winding. The number of turns of the auxiliary is less than the number of turns of the primary so that voltage across the storage capacitor is reduced without load carrying capacity of the DC-to-DC converter.

Abstract: A DC-to-DC converter is coupled to an AC source (12) including a rectifier bridge (20). An input inductor (24) is coupled to the output of the rectifier stage. An auxiliary winding is coupled to the input inductor (24). The auxiliary winding (26) is characterized by a first number of turns. A storage capacitor (34) is coupled to the auxiliary winding (26). An output transformer (38) is coupled to the auxiliary winding (26). A first switch (46) is coupled in series with the primary (36) of the output transformer (38). The first switch (46) and primary (36) are coupled in parallel with the storage capacitor (34) to the auxiliary winding (26). The number of turns of the auxiliary (26) is less than the number of turns of the primary (36) so that voltage across the storage capacitor (34) is reduced without load carrying capacity of the DC-to-DC converter.

Abstract: A switching circuit is improved in efficiency by including a switching corrector circuit for feeding back reversed polarity, differentiated switching pulses to the base of the switching transistor. In addition, temperature stability is achieved by providing a constant current source for a drive transistor which drives the switching transistor and for a control transistor which controls the drive transistor on the basis of the detected output of the circuit.

Abstract: A power supply device includes a plurality of switching regulators and a waveshaping circuit, or, a switching circuit for converting an input voltage to switching pulses, a transformer for transforming the voltage of the pulses generated in the switching circuit, a rectifier circuit for rectifying the switching pulses provided through the transformer, a switching regulator into which the resulting d.c. input is supplied from the rectifier circuit and a waveshaping circuit. The former waveshaping circuit shapes the waveform of switching pulses generated within one switching regulator of the plurality of switching regulators and supplies the shaped output to the other switching regulators as an input reference waveform. The latter waveshaping circuit shapes the waveform of the switching pulses provided from the transformer and supplies the resulting function waveform to a pulse control unit in the switching regulator as an input reference waveform.