Controlling method and apparatus for four switch step-up step-down DC-DC converter
A technology of a DC converter and a control method, which is applied in the direction of converting DC power input to DC power output, output power conversion equipment, and conversion equipment without intermediate conversion to AC, which can solve the problem of slow output voltage drop and output voltage failure. Problems such as rapid recovery and no energy transfer can achieve the effect of improving the response speed
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[0028] The control method of the buck-boost DC-DC converter of the present invention adopts current mode control in a steady state, carries out voltage sampling at the voltage output terminal, and inputs the sampling voltage and the reference voltage into the error amplifier, and the output signal of the error amplifier is used as a current comparison The reference input of the amplifier, and a compensation network composed of resistors and capacitors is also connected to the output of the error amplifier. In addition, to judge the working mode of the converter, when the load jumps,
[0029] If working in buck mode:
[0030] When the sampling voltage is lower than the first threshold reference voltage, disconnect the output terminal of the error amplifier from the compensation network and the current comparator, adjust the output voltage of the compensation network to the first clamping voltage, and control the full duty cycle of the converter at the same time Work, after the...
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