Abnormality protection circuit for electronic ballast of cold cathode lamp
An electronic ballast and abnormal protection technology, applied in electric light sources, electrical components, lighting devices, etc., can solve the problems of incompatibility with the complex use environment of lighting cold cathode lamps, poor mass production, and startup failures, etc. Avoid triggering failure and the effect of environmental changes, simple circuit structure, and the effect of avoiding circuit damage
Inactive Publication Date: 2014-03-05
CHINA THREE GORGES UNIV
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Problems solved by technology
At present, electronic ballasts for cold cathode fluorescent lamps usually do not have protection functions, or use mechanisms such as ZVS, peak ratio, and overheat protection that come with the switch IC. The impact of triggering the protection mechanism, resulting in false protection, resulting in failure to start, not suitable for the complex use environment of lighting cold-cathode lamps, poor reliability, and poor mass production
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[0019] like figure 1 As shown, a method for abnormal protection of electronic ballasts for cold-cathode lamps includes a double-terminal sampling voltage divider circuit, a half-wave rectifier circuit, a discharge circuit, and a switch circuit. The double-end sampling voltage divider circuit is connected to the half-wave rectification circuit, the half-wave rectification circuit is connected to the discharge circuit, and the discharge circuit is connected to the switch circuit. The double-ended sampling voltage divider circuit is composed of: a first high-voltage ceramic capacitor C1, a second high-voltage ceramic capacitor C2, a third high-voltage ceramic capacitor C3, and a fourth high-voltage ceramic capacitor C4. The first high-voltage ceramic capacitor C1 Connect the second high-voltage ceramic capacitor C2, the second high-voltage ceramic capacitor C2 is connected to the GND terminal, the third high-voltage ceramic capacitor C3 is connected to the fourth high-voltage cer...
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The invention discloses an abnormality protection method for an electronic ballast of a cold cathode lamp, which comprises a double-end sampling voltage division circuit, a half-wave rectifying circuit, a discharge circuit and a switching circuit. The double-end sampling voltage division circuit is connected with the half-wave rectifying circuit, the half-wave rectifying circuit is connected with the discharge circuit, and the discharge circuit t is connected with the switching circuit. The abnormality protection method for electronic ballast of cold cathode lamp disclosed by the invention has the advantages of reliable protection, extensive application range, simple circuit and high cost performance.
Description
technical field [0001] The invention relates to a protection circuit, in particular to an abnormality protection method for an electronic ballast of a cold cathode lamp. Background technique [0002] The photoelectric performance of cold cathode lamp tubes for lighting is much higher than that of traditional fluorescent lamps, and has the advantages of high luminous efficiency, long life, energy saving and environmental protection. However, due to industrial batch manufacturing, installation and long-term use, cold cathode lamps will inevitably have abnormal problems such as air leakage, electrode failure, lamp breakage, and deactivation. At present, electronic ballasts for cold cathode fluorescent lamps usually do not have protection functions, or use mechanisms such as ZVS, peak ratio, and overheat protection that come with the switch IC. The impact of the protection mechanism is triggered, resulting in false protection, resulting in failure to start, not suitable for the...
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IPC IPC(8): H05B41/298
Inventor 罗志会覃亚东
Owner CHINA THREE GORGES UNIV