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A constant current drive controller and LED constant current drive circuit

A constant current drive and control circuit technology, applied in the direction of lamp circuit layout, electric light source, electrical components, etc., can solve the problems of constant current drive controllers such as many peripheral circuit devices, low circuit reliability, and exposed feedback pins. Achieve the effects of avoiding low reliability, improving circuit integration, and simplifying the structure of peripheral circuits

Active Publication Date: 2015-11-25
SHENZHEN SUNMOON MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a LED constant current drive circuit, aiming at solving the problem that the primary side feedback flyback LED constant current drive circuit provided by the prior art uses the auxiliary winding of the transformer and the voltage dividing resistor to realize the detection of the degaussing signal, so that its The constant current drive controller has many peripheral circuit devices, and the reliability of the circuit is low due to the exposure of the feedback pin FB

Method used

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  • A constant current drive controller and LED constant current drive circuit
  • A constant current drive controller and LED constant current drive circuit
  • A constant current drive controller and LED constant current drive circuit

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Embodiment 1

[0021] Embodiment 1 of the present invention proposes an LED constant current drive circuit, such as figure 2 As shown, for ease of description, only the part related to Embodiment 1 of the present invention is shown.

[0022] In detail, the LED constant current drive circuit includes a transformer T1, and also includes: a switch circuit 2, the voltage input end of the switch circuit 2 is connected to the positive pole Vin+ of the power supply, and the voltage output end of the switch circuit 2 is connected to the first end of the primary coil of the transformer T1 , the second end of the primary coil of the transformer T1 is connected to the negative pole Vin- of the power supply, and the switch circuit 2 is used to control whether the primary coil of the transformer T1 is energized or not through the switch state; the constant current drive controller 1 connected to the switch circuit 2; the rectification filter circuit 3. The input end of the rectification filter circuit 3...

Embodiment 2

[0025] Embodiment 2 of the present invention proposes a LED constant current drive circuit, such as image 3 As shown, for ease of description, only the part related to Embodiment 2 of the present invention is shown. Different from the first embodiment, the second embodiment refines the circuit structure of the capacitive circuit 11 , the control circuit 12 , the switch circuit 2 and the rectification and filtering circuit 3 .

[0026] Specifically, the capacitive circuit 11 may include: a switch tube Q1, the voltage input terminal of the switch tube Q1 is used as the input terminal of the capacitive circuit 11 and connected to the voltage input terminal of the switch circuit 2, and the voltage output terminal of the switch tube Q1 is used as the capacitive circuit The output end of the control circuit 11 is connected to the input end of the control circuit 12, and the capacitance in the capacitive circuit 11 is formed by the source-drain parasitic capacitance of the switch tr...

Embodiment 3

[0033] Embodiment 3 of the present invention proposes a LED constant current drive circuit, such as Figure 4 As shown, for ease of description, only the part related to Embodiment 3 of the present invention is shown. Wherein, the circuit structures of the control circuit 12 , the switch circuit 2 and the rectification and filtering circuit 3 are the same as those in the second embodiment, and will not be repeated here.

[0034] Different from Embodiment 2, in Embodiment 3, the capacitive circuit 11 may include: a capacitor C3, one end of the capacitor C3 is used as the input end of the capacitive circuit 11 and connected to the voltage input end of the switch circuit 2, and the other end of the capacitor C3 is used as a capacitor The output end of the resistance circuit 11 is connected to the input end of the control circuit 12 .

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Abstract

A constant current drive controller and an LED constant current drive circuit. The constant current drive controller comprises a capacitive circuit which is used for outputting a degaussing time detection signal, and a control circuit which is used for sampling and timing the degaussing time detection signal output by the capacitive circuit to obtain a degaussing time and controlling the on-off frequency of an external on-off circuit according to the degaussing time. The LED constant current drive circuit comprises a transformer, an above-mentioned constant current drive controller, an on-off circuit and a rectification filter circuit. The constant current drive controller do not use an auxiliary winding and a voltage division resistor of a transformer, thereby simplifying the structure of a peripheral circuit, improving the integration level of a circuit, reducing costs, reducing the area of a system board and avoiding the problem of low reliability caused by the exposure of a feedback pin.

Description

technical field [0001] The invention belongs to the field of constant current drive circuit design, in particular to a constant current drive controller and an LED constant current drive circuit. Background technique [0002] In the primary side feedback flyback LED constant current drive circuit, the feedback signal of the primary coil of the transformer is used to realize the constant current control of the output current. The control principle is: Assume that the output voltage of the primary side feedback flyback LED constant current drive circuit is Vout, the output current is Iout, the inductance of the primary coil of the transformer is Lp, the peak current of the primary coil of the transformer is Ip, and the operating frequency of the circuit is (that is, the switching frequency of the power tube in the circuit) is f, and the conduction voltage drop of the rectifier diode on the secondary side of the transformer is Vd, then Iout=(Lp×Ip 2 ×f) / [2×(Vout+Vd)]; if contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCH05B33/0815H05B45/3725H05B45/382
Inventor 李照华谢靖林道明赵春波胡乔付凌云
Owner SHENZHEN SUNMOON MICROELECTRONICS
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