Transformer isolated driver for power transistor using frequency

Details Transformer isolated driver for power transistor using frequency Transformer isolated driver for power transistor using frequency

1996-10-31

1998-07-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 47, 327109, H03K 738

Patent

active

057810400

ABSTRACT:
A driver for a power transistor (a MOSFET or IGBT) uses a transformer to isolate the power supply from the control signal, but uses very low power components on the isolated side to allow use of a physically small transformer. The control signal is one of two frequencies, and the isolated side of the driver includes a circuit for detecting which of the two frequencies is present. One frequency is preferably twice as much as the other. The output of the frequency detection circuit switches between low and high states depending on the frequency present, and the output of this circuit is connected to the input of a transistor driver circuit which charges the gate of the power transistor.

REFERENCES:
patent: 5469098 (1995-11-01), Johnson, Jr.

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