H-bridge type power amplifier and its blocking means

Details H-bridge type power amplifier and its blocking means H-bridge type power amplifier and its blocking means

1994-11-01

1995-09-26

Mullins, James B.

Amplifiers

Wheatstone bridge with amplifier in at least one arm

330251, 332172, H03F 3217, H03H 700

Patent

active

054537177

ABSTRACT:
The invention concerns H-bridge type power amplifiers and their blocking means.
The memory effect of the capacitive impedance of control inputs of each of the two blocking transistors-in the H-bridge is used to block and unblock the amplifier synchronously with the amplifier input signal: a first switch and a semi-conductor element are placed in parallel with each other, in series with each of these control inputs, such that the blocking of the blocking transistor necessitates the opening of the first switch under the control of the blocking signal, and is dependent on the sign of the charge carried by said capacitive impedance; a second switch controlled by the half periods of the input signal only enables the first switch to close and therefore unblocking of the considered blocking transistor for half periods that are not amplified by this blocking transistor.

REFERENCES:
patent: 4366441 (1982-12-01), Nishimura
patent: 5003271 (1991-03-01), Swanson

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