High-frequency constant current source converter of neon

Abstract

The invention discloses a converter with a high-frequency and constant current power supply of a neon light, which comprises a leakage transformer and a resonant capacitor, wherein, the resonant capacitor is connected in parallel at two ends of a primary coil of the leakage transformer, distributed capacitance and load capacitance of the primary coil of the leakage transformer are converted into the capacitance at two ends of a primary coil and the total capacitance connected in parallel with the resonant capacitance, a parallel resonance comprises the primary coil of the leakage transformer and the resonant capacitance, and the resonance frequency is: (see the following formula); wherein, f is resonance frequency, L is inductance of the primary coil, and C is capacitance at two ends of the primary coil and total capacitance connected in parallel with the resonant capacitance converted through distributed capacitance and load capacitance of the primary coil of the leakage transformer. The invention outputs sinusoidal wave voltage to drive the neon light tube through parallel resonance, and current of the neon light tube also adopts sinusoidal wave. Therefore, the brightness of the neon light tube is enhanced, the service life of the neon light tube is prolonged, and the radio-frequency electromagnetic interference caused by the higher harmonic radiation is reduced.

Description

technical field [0001] The invention relates to a high-frequency constant current power converter for neon lights. Background technique [0002] The commonly used high-frequency constant-current power converter for neon lights adopts a voltage-fed double-transformer topology (that is, a voltage source power supply structure). The instantaneous overvoltage and overcurrent will cause the failure of the converter. The operating frequency of this type of structural converter is not easy to set, and the output is a rectangular wave voltage to drive the neon tube, which will generate radio frequency electromagnetic interference (RFI) caused by high-order harmonics, which has the following disadvantages: [0003] 1. The output power is low, which makes the brightness of the neon tube dim; [0004] 2. The constant current characteristic is poor, and the brightness is uneven when driving neon tubes of different lengths; [0005] 3. The electromagnetic interference is too large, wh...

AI Technical Summary

Problems solved by technology

[0002] The commonly used high-frequency constant-current power converter for neon lights adopts a voltage-fed double-transformer topology (that is, a voltage source power supply structure). The instantaneous overvoltage and overcurrent will cause the failure of the converter

The operating frequency of this type of structural converter is not easy to set, and the output is a rectangular wave voltage to drive the neon tube, which will generate radio frequency electromagnetic interference (RFI) caused by high-order harmonics, which has the following disadvantages:

[0003] 1. The output power is low, which makes the brightness of the neon tube dim;

[0004] 2. The constant current characteristic is poor, and the brightness is uneven when driving neon tubes of different lengths;

[0005] 3. The electromagnetic interference is too large, which interferes with the surrounding electronic equipment;

[0006] 4. The reliability of the protection circuit is low

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