电源转换电路的控制电路;CONTROL CIRCUIT FOR POWER CONVERTING CIRCUIT

摘要

本发明提出一种电源转换电路的控制电路，其包含：多用途接脚、脉宽调变信号产生电路、电压检测电路及零电流侦测电路。电压检测电路会检测多用途接脚的信号，当多用途接脚的信号大于预设值时，电压检测电路会设置脉宽调变信号产生电路间歇地导通电源转换电路的电流开关。零电流侦测电路会检测多用途接脚的信号，以决定电流开关的导通状态。此外，当多用途接脚的信号小于预设值时，电压检测电路会设置脉宽调变信号产生电路将电流开关设置为不导通。;A control circuit for a power converting circuit includes a multifunctional pin, a pulse-width-modulation (PWM) signal generating circuit, a voltage detection circuit and a zero-current detection circuit.The voltage detection circuit detects a signal on the multifunctional pin.When the signal on the multifunctional pin is greater than a predetermined value, the voltage detection circuit configures the PWM signal generating circuit to intermittently conduct a current switch of the power converting circuit.The zero-current detection circuit detects the signal of the multifunctional pin to determine the conduction status of the current switch.When the signal of the multifunctional pin is less than the predetermined value, the voltage detection circuit configures the PWM signal generating circuit to turn off the current switch.