Tremble control circuit and switching power supply frequently

抖频控制电路及开关电源

Abstract

一种抖频控制电路,包括抖频信号产生电路,抖频信号产生电路包括电压比较器,电压比较器的正极输入端连接分压电路;电压比较器的负极输入端连接储能电路;电压比较器的输出端通过一回差电路与电压比较器的正极输入端连接、通过一放电电路与储能电路连接;当正极输入端的电压大于负极输入端的电压,电压比较器输出高电平;当正极输入端的电压小于负极输入端的电压时,电压比较器输出低电平,放电电路对储能电路进行放电,回差电路调节输出高、低电平的响应时间。本实用新型能够降低电源电压的电压变化率和电流变化率,使得电路结构变得简单且能降低电磁干扰。本实用新型还公开一种含该抖频控制电路的开关电源。
The utility model provides a tremble control circuit frequently, the signal produces the circuit to including trembling frequently, trembles the circuit of signal production frequently and includes voltage comparater, and voltage comparater's positive input terminal connects bleeder circuit, tank is connected to voltage comparater's negative pole input, voltage comparater's output is connected, is connected with tank through a discharge circuit through the positive input terminal of a return difference circuit with voltage comparater, be greater than the voltage of negative pole input, voltage comparater output high level when positive input terminal's voltage, when positive input terminal's voltage is less than the voltage of negative pole input, the voltage comparater output low level, the discharge circuit discharges to tank, and the output of return difference circuit adjusts is high, the response time of low level. The utility model discloses the voltage variation that can reduce mains voltage is rateed and the current changing rate for circuit structure becomes simple and can reduce electromagnetic interference. The utility model discloses it contains this switching power supply who trembles frequency control circuit still to disclose one kind.

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