About SCR Power Supplies
SCR power supplies use silicon controlled rectifier (SCR) topology to provide well-regulated voltage and current output. Silicon controlled rectifiers (SCR) are four-layer thyristors with an input control terminal, an output terminal, and a cathode or terminal that is common to both the input and output terminals. An SCR circuit is commonly used in applications that use high voltages and currents.
SCR power supplies are used to power heat induction systems that are used for heating and forging metal, melting and other heat treating applications. SCR power supplies use SCR controllers to regulate output power to industrial furnaces and ovens and are often coupled with computer hardware and software to monitor and control the power throughput. An SCR controller typically has two modes of operation: phase angle or zero-crossing. In phase angle mode, the SCR controller puts through a partial waveform during every half-wave cycle to control the power output. In zero-crossing mode, the controller detects the zero crossing of the AC voltage and allows the controller to start with a zero crossing of the voltage. A zero-crossing SCR power controller eliminates the harmonic problems often associated with the phase angle SCR controller.
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