The circuit and electric appliance matched with the lighting metal halide lamp should have the following three basic functions: First, the lighting circuit should have enough open circuit voltage to enable the lamp to start the ignition point. Second, when the lamp is started, the lighting circuit should be able to effectively adjust the current so that the lamp current is controlled within an effective range to ensure stable and reliable operation of the lamp. Third, during the ignition period of the lamp (in the life), it can re-ignite well every half week, that is, it does not extinguish the arc during the life. To meet these conditions, the electrical equipment of the lighting circuit must be matched to the lamp. This matching electrical appliance must not only match the initial performance of the lamp, but also match the change of the lamp during its lifetime, so as to truly ensure the reliable operation of the lamp. Work to give full play to the superior performance of the lamp.
According to the lighting circuit that is widely used in the current illumination metal halide lamp, the super-town circuit is used, that is, the leading peak self-coupled leakage magnetic transformer and the capacitor series lighting circuit. The capacitive reactance of the circuit is slightly larger than the inductive reactance of the inductor, making the circuit capacitive, so that the lamp current phase leads the open circuit voltage, which is the meaning of advance.
The stagnation circuit is used, that is, the lighting circuit combined with the magnetic ballast and the electronic trigger. For a metal halide lamp with a starter electrode (ie, a metal halide lamp with an electrode start mode), it is not appropriate to use a lighting circuit in which an inductive ballast is combined with an electronic trigger. This is because when the lamp is activated, the voltage pulse of the electronic trigger is applied to both ends of the arc tube, and the gap between the starting electrode and the main electrode at the same end thereof is also applied. The gap is only 23 mm apart, and the gap is easily pulsed by the high voltage. Breakdown produces an arc discharge, and some knowledge of the characteristics of the illuminated metal halide lamp causes the bulb to burn out. Such a lamp with a starting electrode is only suitable for use in a super-spot lighting circuit.
Semiconductor Module Devices can be applied to all industries where energy power needs to be adjusted and changed. Such as transformer voltage regulation, heating industry thermostats, metal processing industry electroplating, electrolysis, power supply industry battery charge and discharge, power supply voltage regulator, electromagnetic field excitation and various industries widely used DC motor speed control, AC motor soft start.
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