Control circuit of multiphase power converter controlled by fixed working time and method
A fixed working time, multi-phase power supply technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of the multi-phase power converter switching cycle is not fixed, the multi-phase power converter 40 is not easy to interleave operation, etc.
Inactive Publication Date: 2012-12-05
RICHTEK TECH
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However, the switching cycle of the multi-phase power converter 40 is not fixed, so the interleaved operation cannot be achieved by dividing the cycle like the multi-phase power converter 10, that is to say, the multi-phase power converter 40 is not easy to realize the interleaved operation
[0006] Therefore, there are above-mentioned inconveniences and problems in the known multi-phase power converter controlled by fixed working time.
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[0038] The present invention will be further described below in conjunction with embodiment and accompanying drawing.
[0039] see now Figure 4 , Figure 4 It is a schematic diagram of the first embodiment of the present invention. As shown in the figure, the step-down multi-phase power converter 90 controlled by fixed working time includes a plurality of channels 94, 96 and 98 for converting the input voltage Vin into an output voltage Vo, and the control circuit 92 provides control signals PWM1, PWM2 and PWMN drive multiple channels 94 , 96 and 98 . In the control circuit 92, the error amplifier 118 detects the output voltage Vo to generate an error signal Vc, the adder 116 combines the channel currents IL1, IL2 and ILN in all channels 94, 96 and 98 to generate a total signal Isum, and the adder 114 combines the error signal Vc and the total signal Isum generate an error signal Vc', the regulator 108 includes a comparator 110 to compare the error signal Vc' and the sawto...
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The invention discloses a control circuit of a multiphase power converter controlled by fixed working time. The control circuit comprises an error amplifier, a summator, a regulator, a working hour generator and a minimum current comparator, and is characterized in that the error amplifier detects a first error signal generated by output voltage; the summator combines the comprehensive signal generated by the channel current in multiple channels for regulating a second error signal generated by the first error signal; the regulator generates a regulating signal according to a second error signal and a sawtooth wave signal; the working hour generator generates a control signal according to the regulating signal for driving a selected channel in the multiple channels; and the minimum current comparer detects the channel current in the selected channel for determining whether the working hour generator is enabled or not.
Description
technical field [0001] The invention relates to a multi-phase power converter, in particular to a control circuit and method for a multi-phase power converter controlled by a fixed working time. Background technique [0002] Traditional multiphase power converters mostly use independent modulators for each phase or fixed switching frequency control modes. Independent modulators for each phase respectively receive synchronous sawtooth control signals to achieve multi-phase interleaved operation. The fixed switching frequency control mode uses fixed phase sequence and time interval to achieve multi-phase interleaved operation. The so-called fixed phase sequence interleaved mode uses a fixed-time phase-shifted synchronous signal to separately drive each phase circuit connected in parallel. [0003] figure 1 Shows a traditional fixed-phase-sequence interleaved multi-phase power converter 10, wherein channels 12, 14 and 16 are used to convert the input voltage Vin to an output ...
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IPC IPC(8): H02M3/10
Inventor 李忠树黄建荣郑仲圣
Owner RICHTEK TECH