Fluorescent illumination, which is widely used at present, is a low-pressure mercury vapor arc discharge lighting fixture. Due to the negative resistance characteristic of the gas discharge electric light source, it is difficult to maintain a stable discharge state of the light source itself, and it is necessary to cooperate with the ignition and ballast compensation circuit to obtain a good illumination source. However, the commonly used inductive ballast lighting system has a lower lighting efficiency and a smaller power factor (only about 0.5), which is disadvantageous for energy saving. At the same time, when the fluorescent lamp works under the condition of AC voltage, the voltage polarity is constantly changed at both ends of the lamp tube, and the resulting stroboscopic effect not only damages the vision of people who work at the desk for a long time, but also engages in high-speed rotation or In the work of mechanical parts such as rapid reciprocating motion, it is also hindered, affecting work efficiency and machining accuracy (if the power supply voltage frequency is 50 Hz, the fluctuation frequency of the light source is about 100 Hz). The improved LL-C combination ballast is now compared to the performance of the other two ballasts. LL-C ballast working principle wiring diagram Several fluorescent lamp ballast performance comparison table (load is double tube T8F36W thin tube energy saving fluorescent lamp) ordinary inductive high performance electronic LL-C combination type starting performance normal excellent normal input power ≈92W≈78W power factor ≈0.5>0.98 power loss 10W×23W×2 stroboscopic effect Severe performance evaluation is generally reliable. The basic working principle of this scheme is described by taking double-tube fluorescent lamp as an example. The vector analysis diagram of the working principle of the LL-C ballast is the wiring diagram of the working principle of the scheme. L1 is a common single-coil ballast, L2 is a common single-coil inductor in series with a suitable capacitor C (ie, constitutes an L-C ballast circuit), ○S is a starter, and Lamp1 and Lamp2 are respectively two of the same power. Fluorescent tube. The above components are in the same luminaire to form the same lighting line system. Yes vector analysis illustration. Among them, Un is the power supply voltage, UL1 is the inductance ballast voltage, UL2C is the LC type ballast voltage, ULP1 and ULP2 are the two lamp voltages respectively, á is the system power factor angle, and A is the two lamp current phase difference. L1 and Lamp1 constitute an inductive branch, and L2-C and Lamp2 constitute a capacitive branch. Since the power of the two branches is equal, the superposition diagram of the reactive flux fluctuation function of the reactive part compensates each other, thereby increasing the system power factor (the theoretical value is close to 1.0).
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