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What are the main parameters of SCR?
SCR (Silicon Controlled Rectifier) referred to as SCR, is a high-power electrical components, also known as thyristor. It has the advantages of small size, high efficiency and long life. In the automatic control system, it can be used as a high-power drive device to complete the control of high-power equipment with low-power controls. It is widely used in AC and DC motor speed control system, power regulation system and servo system. What are the main parameters of the silicon controlled rectifier? Commonly used are phase shift bridge trigger circuit, single junction transistor trigger circuit, crystal triode trigger circuit, the application of small thyristor trigger circuit, and so on.
Rated on-state uniform current IT Under certain conditions, the uniform value of 50Hz sinusoidal half-wave current that can pass continuously between anode and cathode. The forward blocking peak voltage VPF can be repeatedly applied to the forward peak voltage across the SCR when the control pole is open without a trigger signal and the anode forward voltage has not exceeded the conduction voltage. The peak value of the forward voltage accepted by the thyristor cannot exceed the value of this parameter given in the manual. Reverse blocking peak voltage VPR When the thyristor is applied with a reverse voltage and is in a reverse off state, the reverse peak voltage across the thyristor can be repeatedly applied. When used, you cannot exceed the value of this parameter given in the manual.
The control pole trigger current Ig1 and the trigger voltage VGT are the minimum control pole current and voltage required for the SCR to change from the off state to the on state when a certain voltage is applied between the anode and the cathode at a regular ambient temperature. The maintenance current IH is at regular temperature, the control pole is open, and the minimum anode forward current necessary to maintain the thyristor conduction is maintained. Many new SCR components have come out one after another, such as the fast SCR suitable for high-frequency applications, the two-way SCR that can be controlled by a positive or negative trigger signal, the positive trigger signal can be used to turn it on, the negative trigger signal to turn it off, and so on.
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