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High-frequency constant current source converter of neon

A constant current power supply, neon light technology, applied in the direction of electric light source, AC power input to DC power output, light source, etc., can solve problems such as interference with electronic equipment, large electromagnetic interference, low output power, etc. The effect of high dynamic impedance and improved reliability

Inactive Publication Date: 2009-07-01
迈博电子技术(上海)有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The commonly used neon power converter adopts the voltage-fed double-transformer topology (that is, the voltage source power supply structure). When the converter is started or the output is open circuit and the input or output is abnormally disturbed, this type of structure cannot limit the instantaneous overshoot of the switch tube. overvoltage and overcurrent will lead to the failure of the converter
The operating frequency of this type of structure 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. This type of structure 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

Method used

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  • High-frequency constant current source converter of neon
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  • High-frequency constant current source converter of neon

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Embodiment Construction

[0020] The neon light power converter of the present invention can adopt push-pull topology or half-bridge topology, such as figure 1 Shown is a schematic diagram of a typical push-pull topology, the primary coil T1-2 of the flux leakage transformer has a center tap, the center tap is connected to the DC power supply VCC, and the two ends of the primary coil T1-2 are respectively connected to the push-pull switch Q1 and the drain of Q2, and the sources of the push-pull switches Q1 and Q2 are grounded. Such as figure 2 Shown is a schematic diagram of a typical half-bridge topology structure, the drain of the half-bridge switch Q1 is connected to the DC power supply VCC, its source is connected to the drain of the half-bridge switch Q2, the source of the half-bridge switch Q2 is grounded, and the capacitor connected in series One end of C2 and C3 is connected to the power supply, and the other end is grounded. One end of the primary coil T1-2 of the leakage flux transformer is...

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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 at least one constant current inductor, wherein, the constant current inductor is connected in series in a supply circuit of the converter with the high-frequency and constant current power supply of the neon light so as to ensure constant current feeding in a current feeding manner. Because the invention utilizes the current feeding, the power supply source of the converter has higher dynamic impedance (approximate constant current), so that instant overvoltage and overcurrent caused by abnormal interference of starting the converter or outputting an open circuit and inputting or outputting of the switch tube is prohibited in a real time manner, the reliability of the converter is effectively enhanced, and the service life of the converter is prolonged.

Description

technical field [0001] The invention relates to a neon lamp power converter, in particular to a neon lamp high-frequency constant current power converter. Background technique [0002] The commonly used neon light power converter adopts the voltage-fed double-transformer topology (that is, the voltage source power supply structure). When the converter is started or the output is open-circuited and the input or output is abnormally disturbed, this type of structure cannot limit the instantaneous overshoot of the switch tube. Overvoltage and overcurrent will cause the failure of the converter. The operating frequency of this type of structure 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. This type of structure has the following disadvantages: [0003] 1. The output power is low, which makes the brightness of the neon tube ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/295H05B41/24H02M7/523
Inventor 陈白迪陈安迪
Owner 迈博电子技术(上海)有限公司
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