Dc chopper circuit fed by a constant current source

Details Dc chopper circuit fed by a constant current source Dc chopper circuit fed by a constant current source

H - Electricity

03

K

323/4

H03K 17/60 (2006.01) H03K 3/357 (2006.01) H03K 17/04 (2006.01) H03K 17/73 (2006.01)

Patent

CA 1278340

DC CHOPPER CIRCUIT FED BY A CONSTANT CURRENT SOURCE Abstract of the Disclosure An apparatus for periodically interrupting a large direct current flow through a load is able to maintain a substantially constant level of current from the source both when it flows through the load and when it is interrupted, with minimum effect on the direct current source. A first power semiconductor switch is connected in parallel with the load and is switched on briefly to transfer current flow from the load to the first semiconductor switch. A second power semiconductor switch is in series with a precharged capacitor across the load. When the second power semiconductor switch is gated on a large influx of current through the second semiconductor switch into the capacitor transfers the current flow from the first semiconductor switch to the second semiconductor switch When the charge on the capacitor reaches a level sufficient to turn off the second semiconductor switch, the current flow transfers back to the load. Any minor fluctuations in current level during the transfers are smoothed by an inductor in series with the output from the direct current source.

506428

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