Constant-on-time primary side constant-current control device for LED driver with high power factor

A technology of LED driver and high power factor, applied in the field of primary side constant current control device of high power factor LED driver, can solve the problem that the performance may not be optimal.

Active Publication Date: 2011-01-19
盐城市盐南高新区都市产业发展有限公司
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  • Application Information

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Problems solved by technology

At present, there are control chips that can realize the primary side constant current control and high power factor requirements, mainly including PI's LNK-PH series and Infineon's ICL8001G. These two chips can basically meet the primary side constant current control and high power factor requirements. But the performance may not be optimal

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  • Constant-on-time primary side constant-current control device for LED driver with high power factor
  • Constant-on-time primary side constant-current control device for LED driver with high power factor
  • Constant-on-time primary side constant-current control device for LED driver with high power factor

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Embodiment Construction

[0050] The content of the present invention will be described in detail below in conjunction with the block diagram of the present invention and the schematic diagrams of specific embodiments.

[0051] refer to figure 1 , the constant on-time high power factor LED driver primary side constant current control device includes: peak sampling and holding module 100, secondary side current simulation module 200, average current loop 300, sawtooth wave generation module 400, comparison module 500, inductor current overpass Zero detection module 600 , driving pulse generation module 700 and driving module 800 .

[0052] The output terminal of the peak sampling and holding module 100 is connected to the input terminal of the secondary current simulation module 200, the output terminal of the secondary current simulation module 200 is connected to the input terminal of the average current loop 300, and the output terminal of the average current loop 400 is connected to an input of the ...

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Abstract

The invention discloses a constant-on-time primary side constant-current control device for an LED driver with a high power factor. The existing constant-current control device is easy to have the problem of optocoupler aging and has more complex circuits. In the invention, the output end of a peak sample and hold circuit is connected with the input end of a secondary side current analog module, the output end of the secondary side current analog module is connected with the input end of an average current loop, the output end of the average current loop is connected with the input end of a comparison module, the other input end of the comparison module is connected with the output end of a sawtooth wave generation module, the output end of the comparison module is connected with the input end of a drive pulse generation module, the other input end of the drive pulse generation module is connected with the output end of an inductive current zero-crossing detection module, and the output end of the drive pulse generation module is connected with a driver module. By means of the device of the invention, the high power factor and output constant current control can be realized.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to a primary side constant current control device of a high power factor LED driver with constant conduction time. Background technique [0002] Current high-power LED drivers usually need to meet the following requirements: output constant current, high power factor and electrical isolation. Among them, the output constant current is determined by the characteristics of the LED itself, the high power factor is to reduce the pollution of the driver to the public grid, and the electrical isolation is for safety considerations. Electrical isolation is usually achieved by using a high-frequency transformer. In order to achieve output constant current control, the usual practice is to collect the output current signal, and then transmit it to the primary side control circuit through the optocoupler. The existence of the secondary current sampling circuit and the optocoup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 谢小高
Owner 盐城市盐南高新区都市产业发展有限公司
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