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发明公开
CN103532384A 一种开关模式电源及其频率控制方法和控制电路 有权

一种开关模式电源及其频率控制方法和控制电路
摘要：
本发明公开了一种SMPS及其相应的频率控制方法和控制电路。SMPS包括：开关，具有控制端；输出端，提供输出电压为负载供电并提供表征输出电压的电压反馈信号和表征输出电流的电流反馈信号；导通时间信号发生电路，具有输入端和输出端，其中导通时间信号发生电路的输入端接收电流反馈信号，导通时间信号发生电路的输出端提供表征时间长度的时间信号；以及PWM信号发生电路，其中PWM信号发生电路的第一输入端接收电压反馈信号，PWM信号发生电路的第二输入端接收时间信号，PWM信号发生电路的输出端耦接开关的控制端。该SMPS克服了频率随着负载升高而升高的缺陷，具有较低的损耗和较高的效率等优点。
摘要（英）：

The invention discloses a SMPS and a frequency control method and a control circuit corresponding to the same. The SMPS comprises a switch, an output end, a gate-on time signal generating circuit, and a PWM signal generating circuit. The switch comprises a control end. The output end provides output voltage in order to supply power to a load and a voltage feedback signal representing output voltage and a current feedback signal representing output current. The gate-on time signal generating circuit comprises an input end and an output end. The input end of the gate-on time signal generating circuit receives the current feedback signal. The output end of the gate-on time signal generating circuit provides a time signal representing time length. The first input end of the PWM signal generating circuit receives the voltage feedback signal. The second input end of the PWN signal generating circuit receives the time signal. The output end of the PWM signal generating circuit is coupled to the control end of the switch. The SMPS overcomes a defect that frequency increases with the increase in the load and has advantages of low loss and high efficiency.

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