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High-voltage linear constant-current LED drive circuit

A technology of LED driving and constant current control circuit, which is applied in the direction of electric lamp circuit arrangement, electric light source, lighting device, etc., can solve the problems of low power factor, increased production cost, poor linear adjustment rate, etc., and achieves a simple and reasonable circuit structure, reducing The cost of the whole lamp and the effect of improving the service life

Active Publication Date: 2015-11-18
FOSHAN TOPDAY OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing LED drive circuits can be divided into two types: switch-type and linear constant-current LED drive circuits. However, the structure of switch-type drive circuits is complex, so the market is beginning to use linear constant-current drive circuits that are more conducive to mass production.
[0004] The linear constant current drive circuit has the advantages of simple circuit, easy mass production and high efficiency, but it still has some shortcomings. For example, most of the existing linear constant current drive circuits are realized by high-voltage linear constant current IC chips. IC chips are relatively expensive, and their production costs increase accordingly. At the same time, the existing linear constant current drive circuits generally have poor linear adjustment rate, low power factor, and generally cannot achieve dimming, which cannot meet the requirements of LED drive. Due to the high performance and multi-function requirements of the circuit, it is necessary to develop a linear constant current LED drive circuit with low cost, good performance and dimming function.

Method used

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  • High-voltage linear constant-current LED drive circuit

Examples

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Embodiment 1

[0027] Such as figure 2 As shown, in this embodiment, the operational amplifier power supply circuit includes series-connected resistors R12, R13, R14, and a capacitor EC1. The resistor R12 is connected to the voltage bus output by the rectifier filter circuit. The resistor R14 is connected to the capacitor EC1. Ground. The PFC adjustment circuit includes an operational amplifier IC2, a voltage reference IC4, a first sampling resistor, switching tubes Q3 and Q2, the switching tube Q3 is a triode, the switching tube Q2 is a P-type MOS tube, and the resistor R14 is connected to The connection point of the capacitor EC1 is connected to the operational amplifier IC2 through a resistor R15 to supply power; the anode of the voltage reference IC4 is grounded, and the cathode is connected to the positive phase input terminal of the operational amplifier IC2, which is the positive phase of the operational amplifier IC2 The input terminal provides a fixed voltage reference value, such a...

Embodiment 2

[0034] Such as figure 1 with image 3 As shown, the difference between this embodiment and Embodiment 1 is that the constant current control circuit includes a second sampling resistor, a sampling resistor RS, a switch Q1 and an operational amplifier IC1. The connection point of the resistor R14 and the capacitor EC1 in the operational amplifier power supply circuit is connected to the power supply terminal of the operational amplifier IC1 for power supply. The second sampling resistor includes resistors R7, R8, R9 connected in series, and the resistor R7 is connected to the The voltage bus bar output by the rectifier filter circuit, the resistor R9 is grounded; the voltage on the resistor R9 is connected to the non-inverting input terminal of the operational amplifier IC1; the anode of the LED load group is connected to the voltage output by the rectifier filter circuit Bus, the negative pole of the LED load group is connected to the drain of the switching tube Q1, the source o...

Embodiment 3

[0037] Such as figure 1 with Figure 4 As shown, the difference between this embodiment and embodiment 2 is that a power compensation circuit is added to the circuit of embodiment 1. The power compensation circuit includes an operational amplifier IC3, and the voltage on the resistor R9 is passed through the power compensation circuit. After processing, connect the non-inverting input terminal of the operational amplifier IC1. The connection point of the resistor R14 and the capacitor EC1 in the operational amplifier power supply circuit is connected to the power supply terminal of the operational amplifier IC3, and the output terminal of the operational amplifier IC3 is connected to the non-inverting input terminal of the operational amplifier IC1 through the resistor R26 to supply power for the operational amplifier IC1. The resistor R9 is connected to the inverting input terminal of the operational amplifier IC3 through a resistor R24. The non-inverting input terminal of th...

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Abstract

The present invention discloses a high-voltage linear constant-current LED drive circuit, which comprises a rectifier and filter circuit, an LED load group, an op-amp power supply circuit, a constant-current control circuit and a PFC adjusting circuit. The constant-current control circuit ensures the current flowing through the LED load group to be constant based on the feedback control process. The PFC adjusting circuit improves the waveform of the input current and increases the power factor through adjusting the voltage drop of the LED load group. The rectifier and filter circuit is respectively connected with the op-amp power supply circuit, the LED load group and the PFC adjusting circuit. The op-amp power supply circuit is connected with the constant-current control circuit and the PFC adjusting circuit. The constant-current control circuit is connected with the LED load group. The PFC adjusting circuit is connected with the LED load group. The circuit is simple and reasonable in structure, wherein the linear constant-current function of high PFC, high efficiency and high flexibility is realized based on the current feedback control and the lamp bead segmented control.

Description

Technical field [0001] The invention relates to the field of electronic circuits, in particular to a high-voltage linear constant current LED drive circuit. Background technique [0002] Because LEDs have high luminous efficiency, low energy consumption, long life, no mercury and good dimming performance, they are widely used in home lighting and become a new generation of lighting sources. [0003] The lighting method of LED lamps is different from that of traditional lamps. It cannot be directly connected to the AC mains power grid. Instead, the AC mains power must be converted into DC power through the drive circuit before it can be connected to the LED load. Existing LED drive circuits can be divided into two types: switch type and linear constant current type LED drive circuits. However, the structure of the switch type drive circuit is complicated. Therefore, the market tends to use linear constant current type drive circuits that are more conducive to mass production. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 张志源方彬辉
Owner FOSHAN TOPDAY OPTOELECTRONICS TECH
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