Control system for Cuk-type switching power supply
A switching power supply and control system technology, applied in the field of microelectronics, can solve the problems of poor load regulation rate, limited correction ability, complex small signal model, etc., to achieve stable operation and enhance the effect of load regulation rate
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[0021] see figure 2 , with the prior art figure 1 Compared with it, a type III compensation network composed of error amplifier EA, resistors R1, R2, R3 and capacitors C11, C22, C33 and a feedback circuit composed of two identical resistors R connected in series are added to compensate the zero pole of the loop, Keep the loop stable. The control part is composed of an integrating circuit in the prior art, a comparator, an RS flip-flop, a drive circuit plus a type III compensation circuit and a feedback circuit, and the output VEA of the type III compensation network is connected to the inverting terminal of the comparator in the prior art, Compared with the output terminal VE1 of the operational amplifier E1 in the integral circuit connected to the non-inverting terminal of the comparator, the output of the comparator is connected to the R terminal of the RS flip-flop, that is, the reset terminal, which is used to generate a duty cycle signal and is controlled by the drive c...
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