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Input current limiting module, linear constant current system and method

A current limiting module and linear constant current technology, applied in the field of power electronics, can solve the problems of LED not emitting light, achieve the effect of improving power factor value, optimizing system efficiency, and simplifying application circuits

Active Publication Date: 2019-06-11
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing linear constant current system also has the problem that the LED does not emit light when the input voltage is low

Method used

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  • Input current limiting module, linear constant current system and method
  • Input current limiting module, linear constant current system and method
  • Input current limiting module, linear constant current system and method

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Embodiment Construction

[0015] The input current limiting module, linear constant current system and method provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] refer to Figure 1-3 ,in, figure 1 It is a schematic structural diagram of an embodiment of the linear constant current system described in the present invention; figure 2 for figure 1 The circuit diagram of the input current limiting module of the system shown; image 3 for figure 1 The output constant current module circuit diagram of the system shown. The system includes: a rectifier bridge 11 electrically connected to an AC power supply AC and an input electrolytic capacitor Cin electrically connected to the output end of the rectifier bridge 11, and the AC power supply AC is rectified by the rectifier bridge 11 and then input to the The input electrolytic capacitor Cin is charged to the input electrolytic capacitor Cin, and the input electrolytic capacitor Cin o...

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Abstract

The invention discloses an input current limiting module, a linear constant current system and a method. The input current limiting module is suitable for linear constant current systems. The system includes: a rectifier bridge electrically connected to the AC power supply and an input electrolytic capacitor electrically connected to the output of the rectifier bridge. The AC power is rectified by the rectifier bridge and then input to the input electrolytic capacitor. The input electrolytic capacitor is charged, and the input electrolytic capacitor outputs the output current in the form of DC to the load; the input current limiting module is connected in series between the second output terminal of the rectifier bridge and the lower plate of the input electrolytic capacitor, and the upper plate of the input electrolytic capacitor is charged. The first output terminal of the rectifier bridge is connected permanently; the magnitude of the charging current for charging the input electrolytic capacitor is limited by the input current limiting module. The invention can not only improve the power factor value but also realize output without ripple, optimize system efficiency, and realize the function of starting LED light strings with a lower input voltage, and simultaneously simplify application circuits and save circuit costs.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an input current limiting module, a linear constant current system and a method for driving light-emitting LEDs without flickering and high power factor. Background technique [0002] Power factor (PF) is an important technical data of power electronic system and a coefficient to measure the efficiency of power electronic equipment. More and more power electronic equipment requires higher power factor. [0003] The existing linear constant current system mainly uses a rectifier bridge to convert the AC voltage into an input voltage in the form of a half-sine wave, and then charges the input electrolytic capacitor through the input voltage, and filters the input voltage in the form of a half-sine wave into a high-voltage DC output to LED light string, the output current is controlled by a linear constant current chip. The disadvantage of this method is that the input el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 孙顺根朱伟巨胡黎强
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD