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Constant light of switch power supply maintaining lamp and with power feedback

A technology of power supply and main switch, applied in the direction of output power conversion device, electric light source, electric lamp circuit layout, etc., can solve the problems of unbalanced current distribution, eye fatigue, light flickering, etc., achieve no electromagnetic radiation, prevent eye fatigue and myopia Effect

Inactive Publication Date: 2012-11-21
西安阿普莱特光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is only current feedback, the voltage applied to the LED and resistor strings will vary greatly, resulting in an extremely unbalanced current distribution. Some strings are very bright, and some strings are very dark. The lights flicker and the eyes are tired for a long time; in addition, some strings of LEDs are damaged by excessive current or affect reliability, which greatly reduces the service life of the lights

Method used

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  • Constant light of switch power supply maintaining lamp and with power feedback
  • Constant light of switch power supply maintaining lamp and with power feedback
  • Constant light of switch power supply maintaining lamp and with power feedback

Examples

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Embodiment Construction

[0030] Figure 4 It is a block diagram of a constant brightness switching power supply 400 with power feedback, outputting constant power to an output device 403 . In one application, the output device 403 is a lamp. The power supply 400 receives an AC voltage from an input voltage 401 . The filter 415 prevents high frequency currents from entering the input voltage 401 or power system. The protection 414 cuts off the connection between the circuit and the input voltage source or the power system to protect the power supply 401 when there is overcurrent. Bridge rectifier 413 converts the AC power to a DC input voltage. The converter 402 converts the input DC voltage into a DC voltage of a predetermined power value to the output device 403 , and the predetermined power is set by the reference voltage 407 . The voltage feedback 404 samples the voltage of the lamp 403 and feeds a signal proportional to the voltage back to the signal processor 406 inside the controller. The c...

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Abstract

The invention provides a switch power supply and an algorithm. Under one application condition, the switch power supply comprises a switch converter with power feedback. The switch converter outputs constant power to enable the lamp to maintain constant light. A power feedback circuit comprises a current feedback circuit and a voltage feedback circuit. The switch power supply is provided with a controller to adjust connection time and duty ratio of a main switch to maintain constant output power.

Description

technical field [0001] The invention is a switching power supply with power feedback to keep the brightness of the lamp constant. The lamp has no flicker, no electromagnetic radiation, and has the health care function of preventing eye fatigue, myopia and electromagnetic radiation. Background technique [0002] Switching power supplies are used to power many kinds of electrical loads and instruments, such as lamps. Conventional power supplies usually include a converter. A converter is a switching power supply circuit that converts an AC or DC input voltage into a DC output voltage of a specified value through feedback. [0003] figure 1 A block diagram of a conventional switching power supply 100 is shown. In one application, the power source 101 is an AC voltage source. The filter 111 prevents high frequency current from entering the voltage source 101 . Protection 112 disconnects the filter from subsequent circuits in the event of an overcurrent. Bridge rectifier 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02M7/12H02M3/335
CPCY02B20/42Y02B20/40
Inventor 陈亮
Owner 西安阿普莱特光电科技有限公司
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