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LED constant current drive circuit and its control method

A technology of constant current drive and drive circuit, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of LED lamp flickering voltage, gap, and drive circuit damage.

Active Publication Date: 2018-03-06
SHENZHEN SUNMOON MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a LED constant current drive circuit and its control method, aiming to solve the problems in the prior art that the input voltage in the LED drive circuit is unstable, causing the LED light to flicker and the gap between the input voltage and the voltage on the LED light. Problems that cause damage to the drive circuit

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  • LED constant current drive circuit and its control method
  • LED constant current drive circuit and its control method
  • LED constant current drive circuit and its control method

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Embodiment Construction

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0037] In order to illustrate the technical solution of the present invention, specific embodiments are used for description below.

[0038] The present invention provides an LED constant current drive circuit 104, such as figure 2 As shown, the LED constant current driving circuit 104 includes an input circuit 101, a control circuit 102, a driving circuit 104, a switching device 103, an energy storage device 106, and an LED load 105.

[0039] The voltage output terminal of the input circuit 101 is connected to the voltage input terminal of the control circuit 102 and the input terminal of the s...

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Abstract

The invention relates to the technical field of LED lamp control. The invention provides an LED constant current drive circuit and a control method thereof. The LED constant current drive circuit includes an input circuit, a control circuit, a drive circuit, a switching device, an energy storage device and an LED load; The circuit is used to obtain the first differential voltage between the input voltage of the input circuit and the voltage of the energy storage device, and when the first differential voltage is less than the first reference voltage, the switching device is controlled to be turned on; the control circuit is also used to obtain the energy storage device The second differential voltage between the voltage of the device and the voltage of the LED load, when the second differential voltage is less than the second reference voltage, the control switching device is turned off, and the input voltage is realized by adding a control circuit for adjusting the input voltage. Wide voltage input, while reducing the power consumption of the control circuit, to meet the low power consumption and high reliability of the entire circuit.

Description

Technical field [0001] The invention relates to the technical field of LED lamp control, in particular to an LED constant current drive circuit and a control method thereof. Background technique [0002] At present, the linear constant current solution is widely used in small and medium power LED constant current systems with its simple system structure. Common linear constant current solutions such as figure 1 As shown, its constant current output is Iout=Vref / Rcs. The above conventional application scheme has the following defects. One is that the forward voltage of the load LED lamp must be close to the input voltage of the line network, otherwise the power of the drive circuit will be too high and cause damage or shorten the life. For example, the line network input voltage is 220Vac , The peak voltage is 311V, if the load LED lamp voltage drop is 260V, the drive circuit will withstand a voltage of about 60V and the output current is 30mA, the power consumption of the drive c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 李照华胡乔林道明戴文芳
Owner SHENZHEN SUNMOON MICROELECTRONICS
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