Power Drive Controls











FC4 single phase SCR controller utilizes the Phase Lock Loop (PLL) technology to achieve small size, low cost and reliable SCR firing circuits. The controller board generates a set of balanced high current SCR gate pulses in response to a voltage or current control inputs. It features high gate isolation, insensitivity to mains voltage distortion, soft and instant start/stop functions. It is the ideal SCR firing circuit for industrial power supplies, battery chargers and motion controls.


Small size                                                          


Low cost, ease of use                              

2 or 4 pulse gating                                                

Over current adjustment and inhibit         


Span and bias adjustment                                   


Soft and instant inhibit                            


PLL pulse logic circuits




Power supplies

Motor controls

Electrical heaters


DC Converters



Battery chargers


Electrical magnetic controls


Generator controls

Click here for Full Data Sheet FC4.pdf

Click here for Typical Connection Diagram