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LED driving apparatus

A technology for LED driving and switching devices, which is applied in lighting devices, semiconductor lamps, electroluminescent light sources, etc., and can solve problems such as failures and weak compensation methods.

Active Publication Date: 2017-05-24
OPPLE LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that this compensation method is very weak; especially when the input voltage is seriously overvoltage and overheated, if the current of the LED cannot be controlled in time at this time, the electronic components that make up the driver will face overheating and overvoltage. Premature failure due to harsh environment

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Experimental program
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Embodiment Construction

[0025] Please refer to figure 1 and figure 2 As shown, an LED driving device 1 according to the first preferred embodiment of the present invention includes an LED constant current output device, an output rectification and filtering circuit connected to the constant current output device, a power conversion circuit connected to the output rectification and filtering circuit, A rectification and filtering circuit connected to the power conversion circuit, a PWM controller controlling the power conversion circuit, and a protection controller 10 connected to the rectification and filtering circuit at one end and to the PWM controller at the other end. The PWM controller has a current sampling terminal 11 connected to the protection controller 10. The protection controller 10 includes a switching device Q1, a sampling circuit 12 that samples the peak value of the input voltage and controls the switching device Q1 to be turned on and off, a small resistance circuit 13, and a para...

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PUM

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Abstract

The invention discloses an LED driving apparatus. The LED driving apparatus comprises an LED constant-current output apparatus, an output rectification filtering circuit connected with the constant-current output apparatus, a power conversion circuit connected with the output rectification filtering circuit, a rectification filtering circuit connected with the power conversion circuit, a PWM controller controlling the power conversion circuit, and a protective controller with one end connected with the rectification filtering circuit and the other end connected with the PWM controller, wherein the PWM controller is provided with a current sampling end connected with the protective controller, the protective controller comprises a switch apparatus, a sampling circuit which samples an input voltage peak value and controls the switch apparatus to be conducted and broken, a small-resistance circuit and a large-resistance circuit connected in parallel with the two ends of the switch apparatus, when input voltages exceed the peak value, the switch apparatus is conducted, the large-resistance circuit is short-circuited and outputs large currents to the current sampling end of the PWM controller, and accordingly, output currents of the LED constant-current output apparatus are controlled to be reduced.

Description

[0001] 【Technical field】 [0002] The invention relates to a driving device, in particular to an LED driving device. [0003] 【Background technique】 [0004] Due to its advantages of energy saving, safety and environmental protection, long service life, fast response, high luminous efficiency, and easy control, LED lighting gradually and quickly enters people's daily life. However, under the same conditions, the size of the LED driving current is proportional to its own heat generation. The greater the current driving the LED, the more heat the LED itself generates. In this case, for a lamp with a built-in LED driver, the temperature of the cavity of the LED lamp will rise sharply, and the reliability of the electronic components constituting the LED driver will be greatly reduced. Considering the abnormal overvoltage of the input voltage and the overheating of the ambient temperature of the LED lamp, the reliability of the LED driver will fail rapidly. [0005] In the tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/30
Inventor 陈峰冯守刚
Owner OPPLE LIGHTING