Switching regulated DC-DC converter using variable capacity diod

Details Switching regulated DC-DC converter using variable capacity diod Switching regulated DC-DC converter using variable capacity diod

1991-07-30

1992-08-18

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 56, H02M 3337

Patent

active

051405130

ABSTRACT:
A switching regulated power supply, the output voltage of which is regulated according to a pulse width modulation method, is provided with a reference oscillator for generating first and second synchronizing signals, phases of which are complement each other, first and second time constant circuits, to which the first and second synchronizing signals are supplied respectively, each one of the circuits having a resister and a capacity device including a variable capacity diode, charge speed up diodes coupled in parallel with the resisters, first and second CMOS drive circuits for inputting the output signals of the first and second time constant circuits and for providing drive signals according to the output signals, a DC-DC converter having push-pull switching devices driven by the drive signals of said first and second CMOS drive circuits, and a control circuit for detecting an output voltage of the DC-DC converter and for controlling capacitance of the variable capacity diodes of said first and second time constant circuits in response to the output voltage of said DC-DC conveter.

REFERENCES:
patent: 4027228 (1977-05-01), Collins
patent: 4155113 (1979-05-01), Simmons
patent: 4829415 (1989-05-01), Haferl
Japanese Data Sheet for a Product .mu.PC494 of NEC (1988).

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