Single-stage isolated PFC (power factor correction) converter direct-current control system and control method based on DAB (dual active bridge)
A technology of current control and converter, which is applied in the control/regulation system, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc., which can solve the problems of increasing the difficulty of the control system and reducing the system bandwidth. , achieve the effect of reducing cost, improving stability and rapidity
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[0044] see image 3 , is a specific example of the present invention. Its main parameters are as follows:
[0045] ●Input voltage
[0046] ●Output reference voltage V ref = 400V;
[0047] ●Switching frequency f s = 50kHz;
[0048] ●Inductance L=40uH;
[0049] ●Transformer turns ratio N:1=0.59:1;
[0050] ●EMI filter parameter L di =50uH;L fi =50uH;R di = 5Ω; C i =7uF; C o = 1mF;
[0051] ●With resistive load.
[0052] Figure 4 are the output voltage and output current waveforms of the AC power supply, as shown in the figure, the direct current control method of the present invention is used to make the output current waveform of the power supply track the voltage waveform, thereby realizing power factor correction. At this moment, the power factor PF of the converter is 0.995, and the input current THD is 2.5%.
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