Overload detecting circuit for a PWM amplifier

Details Overload detecting circuit for a PWM amplifier Overload detecting circuit for a PWM amplifier

1978-09-18

1979-11-06

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including protection means

330207A, 330207P, 330251, H03F 304

Patent

active

041737393

ABSTRACT:
An overload detecting circuit for a PWM amplifier includes an output current detecting circuit and an output voltage detecting circuit. The output of the output voltage detecting circuit is supplied to a rectifying circuit having a discharge time constant determined by the cut-off frequency of a low pass filter as a demodulator of the PWM amplifier. A comparison circuit is provided to produce an overload indicative signal in response to the comparison result between the outputs of the rectifying circuit and of the output current detecting circuit.

REFERENCES:
patent: 3526846 (1970-09-01), Campbell
patent: 3998694 (1976-10-01), Yamazaki
patent: 4047120 (1977-09-01), Lord et al.
patent: 4061983 (1977-12-01), Suzuki

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