An ARCP soft switch circuit with voltage clamp function
A voltage clamping and soft switching technology, applied in high-efficiency power electronic conversion, output power conversion devices, conversion equipment without intermediate conversion to AC, etc. Large volume and other problems, to achieve the effect of low cost, improve reliability and efficiency, and improve product competitiveness
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Embodiment 1
[0030] Such as Figure 4 As shown, in this embodiment, the fourth clamping freewheeling switch SW4 and the fifth clamping freewheeling switch SW5 use diodes, such as D1 and D2 in the figure.
[0031] Such as Figure 5 As shown, when an ARCP soft switching circuit of the present invention is applied to a switching power supply in practice, when the auxiliary switch SW3 is turned off, or when a sudden change occurs in reference quantities such as circuit input voltage and output load, or the main switch tube SW1, When the SW2 drive is abnormal, or when the circuit just starts to start, the AN two-point voltage waveform. and figure 2 It can be seen from the comparison that the peak voltage of SPIKE has been significantly reduced.
Embodiment 2
[0033] Such as Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that it also includes a sixth switch SW6, which is connected in series between the auxiliary switch SW3 and the resonant inductor L2, and the anode of the fourth clamp freewheeling switch SW4 and the fifth clamp continuous The cathode of the current switch SW5 is connected to the connection point of the auxiliary switch SW3 and the sixth switch SW6. The sixth switch SW6 can be a semiconductor device such as IGBT, MOSFET, GTO, SCR or the like. Wherein, the operation of the sixth switch SW6 and the auxiliary switch SW3 are completely synchronized. Its working principle is similar to that of the circuit in the first embodiment.
Embodiment 3
[0035] Such as Figure 7 As shown, the difference between the present embodiment and the second embodiment is that the cathode of the fifth clamp freewheeling switch SW5 is connected to the connection point of the resonant inductor L2 and the sixth switch SW6, and its anode is connected to the negative pole of the DC power supply. Wherein, the operation of the sixth switch SW6 and the auxiliary switch SW3 are completely synchronized. It works with Figure 6 The circuit shown is similar.
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