PULSE WIDTH MODULATION CONTROLLING APPARATUS WITH OVER LOAD PROTECTION USING SOFT START AND FREQUENCY SYNCHRONIZING METHOD

摘要

The present invention relates to a pulse width modulation control apparatus of the soft star art and frequency synchronism with overload protection. The pulse-width modulation control unit, the overload of at predetermined synchronous operation in response to the signal pulse width modulator for generating a pulse width modulated signal, the enabled state in response to a shutdown operating voltage to block the action modulation unit pulse-width Protection and in normal operation receives the external synchronization signal is a fixed constant, the soft star-art voltage and generates a synchronized action signal, to the soft star-art voltage in the event of an overload condition rises above the normal operation overload caused the shutdown operating voltage It characterized in that it comprises a protection control section.