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A high power led constant current drive circuit

A constant-current drive, high-power technology, applied in electric lamp circuit layout, electric light sources, lighting devices, etc., can solve the problems of large product dispersion and inability to achieve accurate control of object current.

Inactive Publication Date: 2015-10-14
JIANGSU FUTIAN ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by sampling the LED string current signal and using a comparator with hysteresis to realize the LED string drive current control, the circuit control accuracy depends on the accuracy of the hysteresis signal of the comparator, and the accurate control of the target current cannot be realized, resulting in product dispersion. Big

Method used

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  • A high power led constant current drive circuit
  • A high power led constant current drive circuit
  • A high power led constant current drive circuit

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with specific drawings.

[0040] like figure 1 and figure 2 As shown, the high-power LED constant current drive circuit includes a 555 timer (U A ), IR2125 driver, voltage amplifier and sampling resistor; the sampling resistor is connected to the LED string circuit; the IR2125 driver is connected to the LED string circuit by driving the switch tube VT; the voltage amplifier is connected to the sampling resistor, and the voltage amplifier is connected to the 555 timer (U A ) connected; 555 timer (U A ) connected with the IR2125 driver. 555 timer (U A ) through the IR2125 driver to drive the field effect switch on and off to adjust the value of the current in the LED string. The IR2125 driver shares the power supply with the driven LED string. An inductance element is set in the LED string circuit. During the turn-on and turn-off process of the field effect switch tube, the current in the LED stri...

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Abstract

The invention discloses a high-power LED constant current driving circuit and a parameter algorithm thereof. The constant current driving circuit comprises a 555 timer, an IR2125 driver, a voltage amplifier and a sampling resistor, the sampling resistor is connected with an LED string circuit, the IR2125 driver is connected with the LED string circuit through a driving VT switch, the voltage amplifier is connected with the sampling resistor and the 555 timer, and the 555 timer is connected with the IR2125 driver. A control signal outputted by the 555 timer drives a field effect transistor to be on or off through the IR2125 driver, and the current value of an LED string is adjusted. The hardware cost of the high-power LED electric light source driving circuit can be effectively reduced. As the control current of the driving circuit can be adjusted, the driving circuit is suitable for constant current driving of high-power LED (strings) within various power ranges. The driving circuit is simple in structure, high in control precision, low in cost and wide in applicable range.

Description

technical field [0001] The invention relates to constant current drive control of LED light-emitting diodes, in particular to a high-power LED constant current drive circuit and its parameter algorithm. Background technique [0002] In the Chinese patent application 201210125825.7, a multi-output high-power LED constant current drive power supply is disclosed, including an AC-AC alternating frequency conversion unit, which is used to convert the AC mains into a frequency and peak stable high-frequency AC voltage to form a high-frequency The output of the AC bus and the high-frequency AC bus are respectively connected to the input ends of multiple LCL passive resonant rectifiers, and each LCL passive resonant rectifier is used to drive the corresponding LED string to emit light. Each LCL passive resonant rectifier is composed of an LCL resonant network unit and a rectification unit. The rectification unit is used to rectify the alternating current output by the LCL resonant n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 陈荣陈益飞卞金洪
Owner JIANGSU FUTIAN ELECTRIC CO LTD
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