专利汇可以提供Power converter专利检索,专利查询,专利分析的服务。并且PURPOSE: To prevent the generation of an unnecessary voltage by outputting an interruption detecting signal based on the change of the phase difference of voltage on the AC side of a PWM converter main unit and a reactor current and stopping the operation.
CONSTITUTION: AC power fed to overhead wires 1 from an electric power substation is received by an electric car through a pantograph 2, supplied to a PWM converter main unit 5 through a transformer 3 and a reactor 4, and converted into DC power while being fed to a DC load through a smoothing capacitor 6. The converter main unit 5 conducts power rectification operation in power running, and performs power inversion operation in regenerative operation. An interruption detector 11 is composed of a DC power formation circuit 12, a target vector pattern formation circuit 13, phase difference detectors 14∼15 and a pattern comparator 16, and an interruption detecting signal S
0 from the detector 11 is used as the shutdown signal of the PWM converter 5. Accordingly, the generation of unnecessary voltage on the AC side of the converter 5 can be prevented.
COPYRIGHT: (C)1989,JPO&Japio,下面是Power converter专利的具体信息内容。
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