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FREQUENCY JITTERING CONTROL CIRCUIT CAPABLE OF RESOLVING THE ELECTROMAGNETIC INTERFERENCE PROBLEM OF A PULSE FREQUENCY MODULATION POWER SUPPLY AND A CONTROLLING METHOD THEREOF
FREQUENCY JITTERING CONTROL CIRCUIT CAPABLE OF RESOLVING THE ELECTROMAGNETIC INTERFERENCE PROBLEM OF A PULSE FREQUENCY MODULATION POWER SUPPLY AND A CONTROLLING METHOD THEREOF
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机译:解决脉冲频率调制电源的电磁干扰问题的频率抖动控制电路及其控制方法
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摘要
PURPOSE: A frequency jittering control circuit of a PFM(Pulse Frequency Modulation) power supply and a controlling method thereof are provided for jittering the switching frequency of the PFM power supply.;CONSTITUTION: A pulse frequency modulator(12) is connected to a power switch. A current control signal generator(18) provides a jittering current control signal. A current detector(14) generates a current detecting signal. Comparators(20,22) are connected to the pulse frequency modulator, the current control signal generator and the current detector. The comparator compares the current detecting signal and current control signal. The comparator generates a second signal.;COPYRIGHT KIPO 2013;[Reference numerals] (16) Output voltage feedback circuit; (18) Current control signal generator
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机译:目的:提供一种PFM(Pulse Frequency Modulation)电源的跳频控制电路及其控制方法,用于抖动PFM电源的开关频率。组成:脉冲频率调制器(12)连接到电源开关。电流控制信号发生器(18)提供抖动电流控制信号。电流检测器(14)产生电流检测信号。比较器(20,22)连接到脉冲频率调制器,电流控制信号发生器和电流检测器。比较器比较电流检测信号和电流控制信号。比较器生成第二个信号。; COPYRIGHT KIPO 2013; [参考数字](16)输出电压反馈电路; (18)电流控制信号发生器
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