Circuit arrangement for free-running blocking-oscillator type sw

Details Circuit arrangement for free-running blocking-oscillator type sw Circuit arrangement for free-running blocking-oscillator type sw

1990-01-25

1991-01-08

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 21, 331112, H02M 3338

Patent

active

049841459

ABSTRACT:
A circuit arrangement for a free running blocking oscillator type switched power pack includes a control means for pulse width modulated drive of an electrical switch element. The control means receives as controlled information, among other things a zero axis crossing detector signal at one input post and a control voltage and a further input post that is dependent upon the output voltage of the switched power pack. To guarantee reliable operation yet yield low power consumption, particularly during the standby mode, it is proposed that a detector means with whose assistance an internal reference voltage is reduced during standby mode be provided in addition to a capacitive coupling of the two input posts. The result is that the undesirable rise in the output voltage in the standby mode and the further boost by the capacitive coupling of the input posts is effectively avoided.

REFERENCES:
patent: 4564820 (1986-01-01), Peruth et al.
patent: 4593347 (1986-06-01), Peruth et al.
patent: 4648016 (1987-03-01), Peruth et al.
patent: 4688159 (1987-08-01), Marinus
patent: 4740880 (1988-04-01), Peruth
Siemens Integrated Circuit TDA 4605.
Siemens "ICs fur die Unterhaltungs-Elektronik", p. 57, for Siemens Integrated Circuit TDA 4605.

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