宽输入电压范围Buck型变流器小信号环路

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Abstract Buck type converters are widely used, however the power stage transfer function will be changed with the change of input voltage. The stability and dynamic performance are hardly designed to a perfect result simultaneously in wide input voltage range applications. Small signal characteristic of Buck converter is analyzed in detailed, and design considerations are introduced. Input voltage is applied as a compensation signal to change the slope of the sawtooth wave and the effect of input voltage in the power stage is eliminated. The concrete compensation circuits are presented for primary side control application and secondary side control application. The Buck type converter with compensation circuit owns the accordant bode plots of the loop gain and performs the good stability and dynamic under wide range input voltages. This method solves the small signal design issue for Buck type converters under wide range input voltages, and makes Buck type converter more suitable for system integration applications.

Key words： Small signal half bridge dynamic performance phase margin

Received: 21 March 2009 Published: 04 March 2014

PACS:	TM46
	TM13

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