Since the invention of silicon controlled rectifier (Silicon Controlled, SCR) in 1958 and the thyristor (THYRIS - tor), which is now used as a thyristor, the thyristor dimmer has been developed very quickly in the past years. In 1960s, foreign countries did not start the thyristor dimmer for stage lighting control, and it was applied to the stage in early 1970s. At present, the thyristor and its derived device bidirectional thyristor (TRIAC) as the core of the light modulator in the stage dimming control occupies a dominant position. Compared with the old dimmer (resistor, transformer), the thyristor dimmer has the advantages of small volume, light weight, low power consumption and high efficiency. More important is the thyristor dimmer with weak control strong, as the stage road is the first centralized control, hundreds of thousands of street lamp brightness, remote control, voice control, pre programmable and digital dimming (DMX - 512), application of new network technology, wireless dimming dimming creates favorable conditions so, various functions including computer console, rich large lighting console functions can be realized, the lighting technology and art have entered into a new era. According to the knowledge of power electronics, thyristor is a kind of power device, as long as it is the control of the application of a trigger signal (weak), you can control the conduction of the power system, the cut-off and the size of the current changes. Thyristor has the advantages of small size, light weight, low power consumption, high efficiency, long life and easy to use. It has a wide range of applications, the formation of a number of application cell circuits, such as rectifier, electronic switches, dimming, speed regulation, voltage regulation, control, etc.. There are many kinds of thyristors, but the most common are the common one way thyristor and the bidirectional thyristor. The application circuit of thyristor is composed of two parts: main circuit and trigger circuit. The thyristor can work normally, except for the necessary voltage between the anode and cathode of the thyristor, and the appropriate trigger signal must be added to the control. The circuit for generating and controlling the trigger signal is called a thyristor trigger circuit.
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