The ballast is a device that regulates current and generates instantaneous high voltage. When the power is cut off instantaneously, it will generate high voltage and add it to the electrodes (filaments) at both ends of the fluorescent tube. The role of the ballast is to improve the lighting quality and lighting energy efficiency, which brings convenience to modern life and is an indispensable accessory for gas discharge lamps. Ballasts are divided into electronic ballasts and magnetic ballasts. Some friends may not know the ballast connection. The following is a detailed explanation.
220 volts is rectified into DC, then the wave is filtered, and then the OTL oscillator circuit composed of two triodes turns the DC into a high frequency alternating current and boosts to obtain a 300+V AC 1000+V peak, which is about 30-80KHZ. The frequency high voltage power is applied to both ends of the lamp, and the lamp is illuminated. (That is to rectify the voltage and then form a high-frequency alternating current through the oscillating circuit, and boost the fluorescent lamp by boosting the transformer.)
Fluorescent electronic ballast connection:
The power factor, the lamp current crest factor and the current harmonic content in the fluorescent electronic ballast are collectively referred to as three technical indicators. In the general fluorescent electronic ballast, it is difficult to achieve the three indicators while achieving the ministry scale. The electronic ballast with HD9712 module can realize the three indicators and reach the “H†level in the scale. The required indicator requirements.
Fluorescent electronic ballasts have a variety of circuit designs. Today, with the rapid advancement of science, the design of fluorescent electronic ballasts is becoming integrated or modular, with the aim of making the circuit structure simple. Electrical functions are more reliable, not chaotic and safe.
Fluorescent four-wire ballast connection:
In the figure, the four-wire ballast has four leads, which are divided into main and auxiliary coils. The two leads of the main coil are connected in the same way as the two-wire ballast, and are connected in series between the lamp and the power source. The two leads of the secondary coil are connected in series between the starter and the lamp to help start. It can be measured and detected by a multimeter, and the resistance is large as the main coil, and the resistance is small as the secondary coil. Since the number of turns of the secondary coil is small, the AC impedance is also small. If it is mistakenly connected to the main circuit of the power supply, the lamp and the ballast are burnt. Therefore, before the ballast is connected to the circuit, it is necessary to see the wiring instructions and distinguish the main and auxiliary coils.
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