Multi-output DC-DC converter using field-effect transistor switc

Details Multi-output DC-DC converter using field-effect transistor switc Multi-output DC-DC converter using field-effect transistor switc

1991-01-22

1991-12-03

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323282, G05F 1577

Patent

active

050702947

ABSTRACT:
A multi-output DC-DC converter comprises a field-effect transistor connected to a one terminal of a DC voltage source, the transistor having a parasitic diode coupled in parallel relationship therewith. A resonant circuit is coupled at one end to the other terminal of the voltage source and a first diode is connected between the transistor and the other end of the resonant circuit to allow a forward current to flow therein. A second diode is connected in parallel with a series circuit formed by the transistor and the first diode to allow current to flow in a reverse direction, the second diode having a recovery time much smaller than the recovery time of the parasitic diode. A first rectifier-filter is coupled to the resonant circuit for developing a first DC output voltage, and a second rectifier-filter is coupled across the terminals of the DC voltage source through the transistor for developing a second DC output voltage. A third diode is connected between the DC voltage source and the second rectifier-filter for blocking a current flow which would otherwise flow through the first and second diodes and the second rectifier-filter. Deviations of the first and second DC output voltages respectively from a reference voltage are detected and the gate of the transistor is driven by switching pulses having a frequency variable as a function of the deviation of the first DC output voltage and having a duration variable as a function of the deviation of the second DC output voltage.

REFERENCES:
patent: 3671853 (1972-06-01), Weischedel et al.
patent: 4521725 (1985-06-01), Phaneuf
patent: 4673865 (1987-06-01), Deluca et al.

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