Overvoltage fly-back resonant-type converter

Details Overvoltage fly-back resonant-type converter Overvoltage fly-back resonant-type converter

2006-04-04

2006-04-04

Riley, Shawn (Department: 2838)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

Reexamination Certificate

active

07023679

ABSTRACT:
A power supply system is implemented without adding a filter circuit by configuring an overvoltage protection circuit without a thyristor. A sub-loop control circuit is added to an AC/DC converter. The sub-loop control circuit is configured such that a photoreceptor side transistor of a photocoupler26has the collector terminal connected to the gate terminal of a MOS-FET2via a resistor38, and the emitter terminal connected to the base terminal of a transistor3, and that the phototransmitter side of the photocoupler26is connected to an operational amplifier39, resistors40–43, and a Zener diode44. In addition, in a DC—DC converter, a Zener diode45is connected across the input of the converter and the non-inverting input terminal of a comparator33with the anode of the Zener diode being connected to the non-inverting input terminal.

REFERENCES:
patent: 4757433 (1988-07-01), Santelmann, Jr.
patent: 6094362 (2000-07-01), Domingo

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