一种高压无频闪驱动电路

Abstract

本实用新型公开了一种高压无频闪驱动电路，包括对外部电源转换为直流电流的转换模块；连接转换模块，对直流电流转换为低压电流的低压恒流模块；连接低压恒流模块，滤除低压电流的纹波并驱动照明模块点亮的去频闪模块。从而，由转换芯片与降压芯片生成低压直流电流，进而滤波芯片与电解电容滤除各频段纹波，驱动灯珠无频闪运行，其电路设计简洁，元件数量少，有效降低了设计生产成本，适用于小尺寸小体积产品。

Claims

1. A high-voltage flicker-free drive circuit, characterized in that, Comprising: a conversion module for converting external power supply into direct current; a low-voltage constant current module connected to the conversion module for converting the direct current into low-voltage current; a frequency flash elimination module connected to the low-voltage constant current module for filtering out the ripple of the low-voltage current and driving the lighting module to light up.

2. A high voltage, no strobe drive circuit according to claim 1, wherein, Comprising: the conversion module adopts a conversion chip DB1, the 2nd pin of the conversion chip DB1 is connected to the zero line of the external power supply through the fuse resistor F1, the 4th pin is connected to the live line of the external power supply, the 1st pin is the positive pole of the direct current, the 3rd pin is the negative pole of the direct current, and the 2nd pin and the 4th pin are connected in parallel with the pressure sensitive resistor MVR1.

3. A high voltage, no strobe drive circuit according to claim 2, wherein, Comprising: the low-voltage constant current module includes a step-down chip U1, a constant current resistor R1, a constant current resistor R2 and a constant current resistor R4; the step-down chip U1 converts the direct current into the low-voltage current; the constant current resistor R1, the constant current resistor R2 and the constant current resistor R4 are used to adjust the current value of the low-voltage current.

4. A high voltage, no strobe drive circuit according to claim 3, wherein, Comprising: the 1st pin of the conversion chip DB1 is connected to the 2nd pin of the step-down chip U1 through the resistor R4; the 3rd pin of the conversion chip DB1 is connected to the 5th pin of the step-down chip U1, and the 6th pin of the step-down chip U1 is connected through the constant current resistor R3, the 7th pin of the step-down chip U1 is connected through the constant current resistor R2, and the 8th pin of the step-down chip U1 is connected through the constant current resistor R1.

5. A high voltage, no strobe drive circuit according to claim 3, wherein, Comprising: the frequency flash elimination module includes a filter chip IC1, an electrolytic capacitor CE1, an electrolytic capacitor CE2, an electrolytic capacitor CE3, an electrolytic capacitor CE4 and an electrolytic capacitor CE5; the electrolytic capacitor CE1, the electrolytic capacitor CE2, the electrolytic capacitor CE3, the electrolytic capacitor CE4 and the electrolytic capacitor CE5 are connected in parallel to form a high-frequency filter unit.

6. A high voltage, no strobe drive circuit according to claim 5, wherein, Comprising: the 1st pin of the step-down chip U1 delivers the low-voltage current to the 1st and 3rd pins of the filter chip IC1; the 2nd pin of the step-down chip U1 is connected to the lighting module, and the high-frequency filter unit is connected in parallel to the filter chip IC1 and the lighting module.

7. A high voltage, no strobe drive circuit according to claim 6, wherein, Comprising: the filter chip IC1 filters out the low-frequency ripple carried by the low-voltage current, and the high-frequency filter unit filters out the high-frequency ripple carried by the low-voltage current.

8. A high voltage, no strobe drive circuit according to claim 6, wherein, Comprising: the lighting module includes a first lighting module composed of a series connection of lamp beads LED1 and LED137, a second lighting module composed of a series connection of lamp beads LED2 and LED138, a third lighting module composed of a series connection of lamp beads LED3 and LED139, and a fourth lighting module composed of a series connection of lamp beads LED4 and LED140; the first lighting module, the second lighting module, the third lighting module and the fourth lighting module are connected in parallel.

9. The high voltage, no strobe drive circuit of claim 1, wherein, Comprising: the low-voltage constant current module is provided with a bypass low-voltage constant current module connected in parallel, which synchronously receives the direct current output by the conversion module and synchronously outputs the low-voltage current. The frequency flash removal module is connected in parallel with a bypass frequency flash removal module, which receives the low-voltage constant current output by the low-voltage constant current module and the bypass low-voltage constant current module synchronously. The frequency flash removal module and the bypass frequency flash removal module supply power to the lighting module synchronously.

10. A high voltage, no strobe drive circuit according to claim 9, wherein, Comprise: A bypass conversion module connected with an external power source synchronously, which delivers bypass direct current to the bypass low-voltage constant current module, which delivers bypass low-voltage current to the bypass frequency flash removal module, which supplies power to the bypass lighting module.

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