RMB4S RCG

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Diodes are kinds of electronic components that are extensively used in circuit constructions. Bridge Rectifiers belong to the assemblage of diodes, they are mainly used in the fields of direct current conversion of alternating current, rectification, signal isolation and motor speed control. An immensely greater application and topic of this kind of device is the RCG (Reverse Current Gate) that is normally used for DC isolating and reversing current control.

The main purpose of using a RCG device is to control the substantial current flow at the forward direction and to block the same current flow at the reverse direction. The work process of this kind of rectifier is independently based on two traits: Forward Current Control (also known as threshold voltage) and Reverse Current Gate.

The RCG device is mainly composed of two thyristors, namely Thyristor A and Thyristor B, which are connected by a variable connected resistance, resistor R1. The control signal generated by the control circuit will set the working threshold of the two thyristors in advance. The forward voltage of Thyristor A triggers Thyristor B, following which Thyristor B gets activated and valuably blocks the current in the reverse direction. This means that the device has enabled a lower than the existing current in the forward direction.

In order to enhance power efficiency, another resistor R2 is added between the anode and cathode of Thyristor B, the voltage drop on the resistor R1 is drived in the same way as before and is used as the driving voltage of Thyristor A. Considering the variant voltage drop of the resistor R2, the triggering voltage of Thyristor B is increased indirectly. Thus, the RCG is intended to control the dissipated forward current to reach a minimum.

In conclusion, the RCG device generally works through two external thyrristors which provide a variable connected resistance across the two thyristors and are applied for current rectification and isolation. The variable connected resistance is used as the driving voltage of Thyristor A and is increased indirectly to increase the triggering voltage of Thyristor B. The control circuit of the RCG consists of the resistor R2 which is used to reduce the current flow in the forward direction while blocking the reverse current. This results in the enormous application of Reverse Current Gate as it controls the dissipated forward current to reach its minimum.

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