Preset voltage type high voltage frequency transformer power unit by-pass circuit for transformer
A technology of preset voltage and bypass circuit, which is applied to bypass circuit and power unit bypass circuit of transformer preset voltage type high-voltage frequency conversion device, can solve the problem of increased bypass circuit volume, low qualification rate and increased resistance power consumption. and other issues to achieve the effect of ensuring safety and reliability
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] image 3 It is the schematic circuit diagram of the first embodiment of the present invention. Such as image 3 As shown, the power unit includes a bypass circuit for the H inverter bridge 1 composed of a diode rectifier bridge 2 , a thyristor 3 and a preset voltage circuit 4 . Wherein the diode rectifier bridge 2 and the silicon controlled rectifier 3 are prior art, and will not be described in detail here. The preset voltage circuit 4 includes: three-phase isolation step-up transformer TC1, three-phase full-wave rectifier bridge RD1-RD6, DC filter capacitor C2, current limiting resistor R2, relay KC1, fuse FU1, charging resistor R1, charging capacitor C1.
[0023] The input terminal of the three-phase isolation step-up transformer TC1 is connected to the three-phase AC input of the power unit. After the isolated AC voltage is rectified by ...
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