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
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[0017] Such as figure 2 As shown, the cascaded buck-boost converter and its control circuit principle diagram involved in the embodiment of the present invention.
[0018] figure 2 The main circuit topology 10 of the medium cascade buck-boost converter includes a DC power supply V in , Four power switches Q 1 , Q 2 , Q 3 And Q 4 , Two inductors L 1 And L 2 , Two filter capacitors C 1 And C 2 , Resistance R o , Where: DC power supply V in Positive connection inductance L 1 One end, inductance L 1 The other end is connected to the power switch Q 1 Drain and power switch Q 2 The source of the power switch Q 2 The drains are connected to the filter capacitor C 1 One end of the power switch tube Q 3 Drain, power switch Q 3 The source is connected to the inductor L 2 One end of the power switch tube Q 4 Drain, inductance L 2 The other end is connected to the filter capacitor C 2 One end and resistance R o One end of the power switch tube Q 1 Source, filter capacitor C 1 The other end...
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