Self-protective variable frequency modulation ICP (Inductively Coupled Plasma) ballast

Abstract

The invention discloses a self-protective variable frequency modulation ICP (Inductively Coupled Plasma) ballast which is characterized in that electric supply input is connected with an EMI (Electro-Magnetic Interference) and surge protection circuit, the input end of a filtering and rectifying circuit is connected with the EMI and surge protection circuit and the output end of filtering and rectifying circuit is connected with an active power factor correction circuit; the output end of the active power factor correction circuit is connected with a half-bridge inverter circuit, the output end of half-bridge inverter circuit is connected with a power matching network, the output end of power matching network is connected with ICP lamp body and an abnormal condition detection circuit; andthe abnormal condition detection circuit is connected with a variable frequency modulation MCU (Micro Controller Unit), the output end of the MCU is connected with the half-bridge inverter circuit and the protection circuit. The ballast provided by the invention can be used for dealing with any emergency situation at anytime; and the reliability of the ballast is improved, the conversion efficiency is improved and the cost is lowered.

Description

technical field [0001] The invention relates to an electronic ballast for an emerging ICP light source, in particular to an ICP ballast with functions such as self-protection under abnormal conditions, frequency conversion modulation EMI control, surge protection, and wide-voltage operation. Background technique [0002] At present, in high-power lighting occasions, the main light sources used are metal halide lamps and ICP light sources, and the important factor determining the life and stability of the light source is the ballast used. Due to power requirements, metal halide lamps must use magnetic ballasts when they are used at high power. However, the shortcomings of magnetic ballasts, such as large size, low power factor, and excessive starting current, have limited their development in the field of energy saving and emission reduction. [0003] The ICP light source couples electromagnetic energy into a closed glass tube through a high-frequency electronic ballast, and ...

AI Technical Summary

Problems solved by technology

As a new type of green electric light source, although the ICP light source has excellent comprehensiveness and effect, there are still some problems in the current ICP electronic ballast, such as the ballast circuit described in the patent "Electromagnetic Induction Lamp Circuit" (Patent No. 200510024047.2), there is no Good input surge protection, limited to a narrow range of DC input voltage, the conversion efficiency is low, and EMI interference cannot be effectively suppressed; the patent "electronic ballast for electrodeless lamps" (patent number: 201020107948.4) does not consider the suppression of EMI interference The problem is that the self-protection circuit in abnormal situations is not perfect; the patent "frequency shaking ballast for electrodeless lamps" (patent number: 201010281447.2) has solved the problem of EMI interference, but it is not perfect in terms of stability and reliability.

In a nutshell, the main problems are (1) reliability and stability: the operation is not normal under a wide range of input voltage, and the protection circuit is not perfect in the abnormal state; (2) conversion efficiency: the traditional inverter circuit and power matching network Low conversion efficiency and high cost; (3) Electromagnetic compatibility: It is difficult to filter out electromagnetic interference waveforms using traditional EMI filters

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