[关键词]
[摘要]
针对传统变频器预充电电路需要光耦隔离和额外电路参与,以及软件算法复杂、调试不便等弊端,设计出了一种具有恒流自适应功能的预充电电路。该电路采用类似Buck电路的结构,自适应维持闭环稳定,为晶闸管触发提供相对稳定的供电,可以实现每相晶闸管交错开通而不再依赖软件参与,同时不需要光耦隔离,也不必关注开关电源优先工作的时序问题。PSIM仿真与实物平台测试结果吻合。测试波形表明,该电路方案切实可行,调试方便,具有一定的参考价值。
[Key word]
[Abstract]
Aiming at the disadvantages of traditional inverter precharge circuit such as optocoupler isolation and additional circuit participation, complex software algorithm and inconvenient debugging, a precharge circuit with constant current adaptive function is designed. The circuit adopts a structure similar to buck circuit. It adaptively maintains closed-loop stability, provides relatively stable power supply for thyristor triggering, and can realize alternate opening of each phase thyristor without relying on software participation. At the same time, there is no need to pay attention to the optocoupler isolation and the timing issue of switching power supply priority. The PSIM simulation results are consistent with the test results of the physical platform. The test waveform shows that the circuit scheme is feasible and easy to debug, and it has certain reference value.
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