Automatic bandwidth control system for any switching frequency of power converter

• Main Authors: CHEN FUQUAN, WU CHENGHAN
• Format: Patent
• Language: Chinese; English
• Published: 23.02.2021
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention provides an automatic bandwidth control system for any switching frequency of a power converter. A pulse generator outputs a preset frequency signal according to a comparing signal. A control circuit controls a first switch and a second switch according to frequencies of the preset frequency signal and an external frequency signal. A first current mirror is connected to an input voltage source and a first terminal of the first switch. A second comparator compares an output voltage of a second reference voltage source with an output voltage of the first current mirror to output the comparing signal. A second current mirror is connected to the input voltage source, an error amplifier and a first terminal of the second switch. A transconductance gain of the error amplifier is controlled by a current of the second current mirror to adjust a bandwidth of the power converter. 本发明提供一种用于电源转换器的任意切换频率的自动带宽控制系统。脉冲生成器依据比较信号输出默认频率信号。控制电路依据默认频率信号与从外部频率信号的频率，以控制第一开关与第二开关。第一电流镜连接输入电压源以及第一开关的第一端。第二比较器比较第二参考电压源与第