Phase-controlled power modulation system

Details Phase-controlled power modulation system Phase-controlled power modulation system

1991-02-20

1993-08-24

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

323246, 323300, 323320, 361 91, 361111, G05F 502

Patent

active

052392554

ABSTRACT:
A phase-controlled power modulation system switches modes in response to circuit-threatening conditions to avert the necessity of a shutdown. Normal operation is in reverse phase control (RPC) mode. When an inductive load sensor detects the presence an inductive load, the system switches to a forward phase control (FPC) mode (FPC) to minimize voltage spikes that would otherwise result from the load's opposition to voltage transitions. When an overcurrent sensor detects an overcurrent, the system switches into an asymmetric hybrid mode (AHPC) to maximize delivered power while remaining within switch current handling capacity. In AHPC mode, an RPC component of a half-cycle waveform is cut off at the current limit, while an FPC component of the same half-cycle waveform is triggered after the source voltage drops to a confidence threshold below the current limit to ensure that current limiting is not triggered again during the same half-cycle. In response to excessive temperature, a short transition mode is entered to reduce the heat generated at the switches until the temperature abates.

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