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Drive method and drive power source of light-emitting diode (LED) lamp with alternating current power supply

An LED lamp, AC power supply technology, applied in the direction of electric lamp circuit layout, electric light source, light source, etc., can solve the problems of long life and shortened life of LED lamp, so as to improve the power utilization efficiency, prolong the overall life, avoid light decay and The effect of life reduction

Inactive Publication Date: 2011-10-19
苏州半导体总厂有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the working life of general electrolytic capacitors is only 3000-5000 hours, especially when the temperature rises in the working environment, the life will be greatly shortened, which does not match the working life of hundreds of thousands of hours of LEDs, which will inevitably limit the life of LED lights long advantage

Method used

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  • Drive method and drive power source of light-emitting diode (LED) lamp with alternating current power supply
  • Drive method and drive power source of light-emitting diode (LED) lamp with alternating current power supply
  • Drive method and drive power source of light-emitting diode (LED) lamp with alternating current power supply

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Embodiment 1

[0018] Embodiment one: see figure 1 As shown, an AC-powered LED lamp driving power supply includes a bridge rectifier circuit connected to an external AC power supply, and n constant current diodes are connected in series at the output end of the bridge rectifier circuit. The size of n is related to the number of LEDs connected in series in the power supply unit, generally in the range of 1 to 8 LEDs.

[0019] See attached figure 1 , connected to the AC power supply, after bridge rectification, it becomes a positive pulsating voltage.

[0020] After m LEDs are connected in series, when it is normally turned on, the voltage that needs to be applied is 3.3V×m (the voltage drop of the rectifier diode in the bridge stack can be ignored). For the input pulsating voltage, only when V≥3.3V×m, LED enters the normal working state.

[0021] See attached figure 2 As shown, only when the amplitude of the rectified pulsating positive half-cycle voltage applied to both ends of the LED ...

Embodiment 2

[0027] Embodiment two: see image 3 As shown, an AC-powered LED lamp driving power supply includes a bridge rectifier circuit connected to an external AC power supply, and multiple series constant current diode groups connected in parallel are arranged at the output end of the bridge rectifier circuit. The series constant current diode group is used to supply power to one LED unit group, and each LED unit group may be provided with a plurality of series-connected LEDs.

[0028] In each path, the number of constant current diodes connected in series matches the number of LEDs powered by the path, and its calculation method is similar to that of Embodiment 1.

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Abstract

The invention discloses a drive method and a drive power source of a light-emitting diode (LED) lamp with alternating current power supply. The drive method comprises the following steps: rectifying an alternating current power source into a positive pulsating power source; carrying out current limiting on the pulsating power source by utilizing series constant current diodes; and leading the LED to operate in a current-controlled state, wherein, the frequency of the pulsating power source is larger than 80Hz. The drive power source comprises a bridge-type rectifier circuit connected with an externally connected alternating current power source, and is characterized in that the output end of the bridge-type rectifier circuit is connected with at least one constant current diode in series. In the drive circuit provided by the invention, any capacitor does not need to be used, thus prolonging the whole service life of the circuit, and effectively improving the utilization efficiency of the power source.

Description

technical field [0001] The invention relates to a driving method and circuit of an LED lamp, in particular to a driving method of an AC-powered LED lamp and a driving power supply using the driving method. Background technique [0002] Compared with traditional incandescent lamps or mercury-containing fluorescent lamps, LED lamps have many advantages such as greenness, energy saving, power saving, and long life. It is considered in the prior art that since LEDs are required to work at low DC voltage, if a mains power supply is used for power supply, it needs to be converted into a DC power supply that meets the working requirements of LEDs through an appropriate circuit topology (see People’s Posts and Telecommunications Press, 2008, 8 Monthly 1st Edition "New Generation Green Light Source LED and Its Application Technology" page 364). Therefore, the current AC-powered LED drive circuits all convert the AC power into a DC power supply. The basic structure is that after the ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 周国钧王平平王兆璠
Owner 苏州半导体总厂有限公司
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