Short circuit protection circuit for a pulse width...

Details Short circuit protection circuit for a pulse width... Short circuit protection circuit for a pulse width...

2008-10-29

2011-11-22

Nguyen, Matthew (Department: 2838)

Electric power conversion systems

Current conversion

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

Reexamination Certificate

active

08064231

ABSTRACT:
A short circuit protection circuit for a pulse width modulation (PWM) unit which includes a PWM logic control circuit, an under voltage lookout (UVLO) circuit and an internal clock circuit; wherein the UVLO circuit detecting a bias power (Vcc) and delivering an UVLO signal when the bias power is judged excessively low, the PWM unit further comprising: a short circuit detector, a short circuit recovery circuit and a frequency multiplexer. The short circuit detector is to detect the UVLO signal and generate a short signal. The short circuit recovery circuit to set a pre-determined recovery time and generate a recovery signal when the pre-determined recovery time ends. The frequency multiplexer which is triggered by the short signal when the short circuit event occurs to change a switching frequency to a short PWM frequency, and triggered by the recovery signal to restore the switching frequency.

REFERENCES:
patent: 6577509 (2003-06-01), Deboy et al.
patent: 2001/0053195 (2001-12-01), Yahiro
patent: 2009/0273738 (2009-11-01), Fukumoto

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