Control circuit of cascade type buck-boost converter and control method thereof
A buck-boost converter and control circuit technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as unstable converters, complicated control, and less research, and achieve Achieve simple, high-efficiency conversion effects
Inactive Publication Date: 2009-10-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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The invention discloses a control circuit of a cascade buck-boost converter and a control method thereof, which belong to the technical field of power electronic converter control. The structure of the control circuit comprises an output voltage sampling circuit, two error amplifiers, a triangle wave generating circuit, a comparator circuit, a drive circuit and a voltage setting circuit; the controlled buck-boost convertor is formed by the cascade of a booster converter and a buck converter; a first control signal and a second control signal which are generated by comparing the control voltage output by the first error amplifier with triangle wave voltage control the switch tube of the booster converter through the drive circuit; the first control signal sets the control voltage output by the second error amplifier through the setting circuit; and a third control signal and a fourth control signal which are generated by comparing the control voltage output by the second error amplifier with the triangle wave voltage control the switch tube of the buck converter through the drive circuit. The invention has the advantages that the circuits are simple, only one triangle wave generating circuit is required to control two circuits, and the conversion efficiency is high.
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