Load voltage clamping circuit for voltage turn-off chopper

Details Load voltage clamping circuit for voltage turn-off chopper Load voltage clamping circuit for voltage turn-off chopper

1975-12-22

1977-04-12

Pellinen, A. D.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

321 45C, H02P 910

Patent

active

040177777

ABSTRACT:
Apparatus for limiting the peak magnitude of voltage applied to a chopper excited load to the magnitude of the source voltage. In a system including a chopper, a smoothing reactor and a load serially connected to a direct current power source, a clamping circuit is connected in parallel with the chopper and smoothing reactor and provides a current path between the load and the direct current source when load voltage attempts to exceed source voltage as a result of commutation transients in the voltage-turn-off chopper. Where the load is a direct current motor, the clamping circuit in combination with a freewheeling diode provides a suppression circuit for power source transients.

REFERENCES:
patent: 3753059 (1973-08-01), Berman
patent: 3761793 (1973-09-01), Naito
patent: 3932800 (1976-01-01), Iwamoto et al.

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