Derived power supply for composite bridge amplifiers

Details Derived power supply for composite bridge amplifiers Derived power supply for composite bridge amplifiers

1998-03-10

2000-12-12

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

330298, H03F 102, H03F 304

Patent

active

061604550

ABSTRACT:
A composite bridge amplifier in which the power supply for the bridge amplifiers includes a time varying non-ground reference DC voltage supply dependant on the input signal. A low voltage power supply circuit uses the time varying non-ground reference DC voltage to produce a fixed DC voltage and includes a centering block which removes unbalanced DC voltages which might otherwise contaminate the time varying non-ground reference DC voltage, by providing balancing currents. This eliminates a costly transformer. Safety isolation is provided using an isolation amplifier with a transformer which has a parasitic capacitance. Improved common mode noise rejection is provided by configuring the isolation amplifier so that currents charging the parasitic capacitance with common mode noise voltage tend to cancel noise current in the secondary winding of the transformer.

REFERENCES:
patent: 4321554 (1982-03-01), Quilter
patent: 4571554 (1986-02-01), Martin et al.

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