Intelligent light adjusting electronic rectifier
A technology for optoelectronics and ballasts, which is applied in the field of intelligent dimming electronic ballasts for high-intensity gas discharge lamps, and can solve problems such as difficulty in implementing control, errors, and rough lamp power control.
Active Publication Date: 2008-08-13
HEFEI DAMING ENERGY SAVING TECH
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Problems solved by technology
[0005] First, the control frequency of variable frequency dimming is relatively precise, but the corresponding lamp power control is very rough. For different lamp tubes of the same model and manufacturer, due to the different characteristics of each lamp tube, the same control frequency will have a relatively large output. Power difference, sometimes up to 40% error
[0006] Second, when the frequency changes, the power of the output lamp will change suddenly, resulting in flickering phenomenon, which will affect the service life of the lamp tube
[0008] The disadvantages of phase dimming are: the complexity and cost of the control circuit are increased, the reliability of the circuit is reduced, and at the same time, it is not easy to implement control
Method used
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[0014] An intelligent dimming electronic ballast, including a control circuit 20, the input terminal of the control circuit 20 receives the timing signal and the power setting signal output by the external circuit 10, and the output terminal of the control circuit 20 is connected to the half-bridge inverter through the RC oscillator circuit 30 The input end of the variable drive control circuit 40 is connected, the AC power supply is connected with the input end of the half-bridge inverter drive control circuit 40 through the power supply circuit 60, and the output end of the half-bridge inverter drive control circuit 40 is connected to the high-pressure gas discharge lamp through the inductance transformer T The HIDs are connected, and the acquisition amplifier circuit 50 acquires the actual voltage of the high-pressure gas discharge lamp HID and inputs it to the control circuit 20 .
[0015] Referring to FIG. 2 , the control circuit 20 includes a single chip microcomputer 21 ...
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The invention relates to a light intelligently adjustable electronic ballast, including control circuit. Input terminal thereof is connected with external circuit, output terminal is connected with input terminal through RC oscillation circuit and half bridge invert driving control circuit, AC power is connected to output terminal of input terminal of half bridge invert driving control circuit through power source circuit, output terminal of half bridge invert driving circuit is connected to HID of high pressure gas discharge lamp, and HID of high pressure gas discharge lamp is connected with control circuit by collection amplifier circuit. The invention makes voltage reference be proportional to power thereof, and power of lamp change in accordance with voltage reference by determining voltage reference of the lamp, which is not only adapted precise control of lamp power, realizing light adjustment, but also suitable for various types of lamps. Moreover, suppression circuit is provided in the invention to avoid gleams phenomenon to light adjustment process.
Description
technical field [0001] The invention relates to an electrical appliance for lighting, in particular to an intelligent dimming electronic ballast for a high-intensity gas discharge lamp. Background technique [0002] At present, there are two dimming technologies for functional dimming electronic ballasts for high-power high-intensity gas discharge lamps: [0003] (1) Frequency conversion dimming: In the LC network output by the half-bridge electronic ballast, the current-limiting inductor is connected in series with the lamp tube. When the inductance value L is constant, its impedance Z=2πfL, as long as the frequency f is changed, it can be changed The value of impedance Z can change the current of the lamp to achieve the purpose of adjusting the power of the lamp and changing the light. Changing the frequency is achieved by changing the output oscillation frequency of the drive circuit, which is determined by an RC oscillator circuit. Changing the resistance of R can chang...
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IPC IPC(8): H05B41/392H05B41/288
Inventor 李劲松权循华
Owner HEFEI DAMING ENERGY SAVING TECH