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LED half-bridge circuit with feedback variable-frequency constant-current driving

A half-bridge circuit and constant-current drive technology, applied in the field of LED half-bridge circuit with feedback variable frequency constant current drive, LED drive circuit, can solve the problem of direct control port without output current, unfavorable heat dissipation of chip peripheral circuit, high current and high power It can reduce the temperature, reduce the power consumption and prolong the service life.

Active Publication Date: 2018-09-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional structure, the application circuits of the IR2151, IR2153, and IR2155 driver chips are as follows: figure 1 shown by figure 1 It can be seen that the power supply terminals of the above three driving chips are provided by the discharge of the electrolytic capacitor C2, and the electrolytic capacitor C2 needs to be charged by the current flowing through the resistor R1. In order to ensure the normal operation of the electrolytic capacitor C2, the charging current will be a large value. , and the large current will cause a large power consumption on the resistor R1, which is not conducive to energy saving and heat dissipation of the peripheral circuit of the chip
[0005] In addition, the above three driving chips do not have a direct control port for output current, so it is difficult to stably control the output constant current through this type of chip

Method used

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  • LED half-bridge circuit with feedback variable-frequency constant-current driving
  • LED half-bridge circuit with feedback variable-frequency constant-current driving
  • LED half-bridge circuit with feedback variable-frequency constant-current driving

Examples

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Embodiment

[0027] Embodiment An LED half-bridge circuit with feedback variable frequency constant current drive

[0028] Such as figure 2 As shown, it includes input rectification and filtering circuit 1, half-bridge control circuit 2, isolation transformer U1, output rectification and filtering circuit 3 connected in series, and also includes a control chip for charging the electrolytic capacitor connected to the power port of half-bridge control circuit 2. Circuit 4, a feedback circuit for regulating output current stability, the input end of the control chip power supply circuit 4 is connected to the half-bridge midpoint of the half-bridge control circuit 2, and the output end is connected to the power supply end of the half-bridge control circuit 2; the feedback The input end of the circuit is connected to the positive electrode of the output load of the output rectification filter circuit, the output end is the primary side of the first photocoupler, and the output is connected in ...

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PUM

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Abstract

The invention discloses an LED half-bridge circuit with feedback variable-frequency constant-current driving function, comprising an input rectifying and filtering circuit, a half-bridge control circuit used for driving a chip in the chip based on one among an IR2151 drive chip, an IR2153 drive chip and an IR2155 drive chip, an isolation transformer and an output rectification filtering circuit. The LED half-bridge circuit further comprises a control chip power supply circuit for charging the electrolytic capacitor connected with the power port of the half-bridge control circuit. The input endof the control chip power supply circuit is connected with a half-bridge middle point of the half-bridge control circuit, and the output end is connected with the power end of the half-bridge controlchip. According to the invention, the structure is simple, and the output driving current is more stable. The method is suitable for driving the high-power LED.

Description

technical field [0001] The invention belongs to the technical field of electronic devices, and relates to an LED drive circuit, in particular to an LED half-bridge circuit with feedback variable frequency constant current drive. Background technique [0002] With the continuous consumption of global energy, electronic technology is constantly developing towards low energy consumption, and energy-saving technology is being rapidly promoted in electronic products. Among them, LED lighting lamps in electronic products have been widely used in many occasions such as street lighting and indoor lighting due to their high working efficiency and low energy consumption. Since the LED lighting lamp has a constant current working characteristic, in order to ensure the working advantage of the LED lighting lamp, an efficient and stable constant current LED driving circuit is the key. [0003] In the prior art, compared with the mainstream constant current drive circuit chips, IR2151, I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 范洋包海燕洪吉忠徐银森牟小兵赵建明陈勇徐开凯洪继霖
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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