Electricity: power supply or regulation systems – External or operator controlled – Using a three or more terminal semiconductive device as the...
Patent
1984-05-01
1986-07-22
Beha, Jr., William H.
Electricity: power supply or regulation systems
External or operator controlled
Using a three or more terminal semiconductive device as the...
307252C, 307253, 307300, 323289, H03K 1760
Patent
active
046022090
ABSTRACT:
In order to provide rapid turn-off of a transistor (or thyristor) having its emitter (or cathode) at a floating potential, on drive is removed from the base of the transistor T1 and almost simultaneously a switch SW1 is closed. This causes a proportion of the current which flows through a capacitor C on turn-off of the transistor T1 to flow through a resistor R1 by way of the base of the transistor T1, thus providing a reverse base current which rapidly turns-off the transistor T1. In a practical implementation of this circuit the switching device is a transistor T.sub.off and the circuit employs a self-timing approach in which removal of an "on" control signal from the gate of a field-effect transistor T7 automatically actuates the reverse current drive.
REFERENCES:
patent: 4295059 (1981-10-01), Steigerwald
patent: 4549095 (1985-10-01), Stefani et al.
Hammond et al., "High Power Vector Summation Switching Power Amplifier Development", Power Electronics Specialists Conference, 1981, Boulder Co. USA, (Jun. 29-Jul. 3, 1981), pp. 267-272 (Fig. 4).
Palmer Patrick R.
Williams Barry W.
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