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Two-terminal current controller and LED lighting device

A technology of a current controller and a lighting device, which is applied in the direction of lighting devices, electric light sources, energy-saving control technology, etc., and can solve problems such as low energy utilization rate and 1200 power factor reduction of light-emitting diode lighting devices

Active Publication Date: 2014-02-12
IML HONG KONG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the resistor R of the LED lighting device 1100 , the inductor L consumes less energy during current limiting, but the inductor L with the current limiting function and the capacitor C with the voltage stabilizing function will greatly reduce the power of the LED lighting device 1200 Factor (power factor), so that energy utilization becomes lower
Meanwhile, in lighting applications, the LED lighting device 1200 of the prior art can only make a trade-off between the operable voltage range and the brightness

Method used

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  • Two-terminal current controller and LED lighting device
  • Two-terminal current controller and LED lighting device
  • Two-terminal current controller and LED lighting device

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Embodiment Construction

[0019] Figure 4 It is a schematic diagram of an LED lighting device 100 in the first embodiment of the present invention. Figure 5 It is a schematic diagram of an LED lighting device 200 in the second embodiment of the present invention. Each of the LED lighting devices 100 and 200 includes a power supply circuit 110 , a dual-terminal current controller 120 , a light emitting device 10 , a Silicon Controlled Rectifier (SCR) and an impedance component ZL. The power supply circuit 110 can receive an AC voltage VS with a positive and negative cycle, and use a bridge rectifier 112 to convert the output voltage of the AC voltage VS in a negative cycle, thus providing a rectified AC voltage V AC To drive the light emitting device 10, where the rectified AC voltage V AC The value of varies periodically with time. The light emitting device 10 may include n light emitting units D connected in series 1 ~D n , each light-emitting unit can contain one light-emitting diode or multip...

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Abstract

The present invention discloses a two-terminal current controller and an LED lighting device. The two-terminal current controller controls a first current flowing through a load according to a voltage across the load. When the voltage across the load does not exceed a first voltage, the two-terminal current controller conducts a second current associated with a rectified AC voltage, limits the first current at about zero, and regulates value of the second current according to the voltage across the load. When the voltage across the load exceeds the first voltage but does not exceed a second voltage, the two-terminal current controller conducts the second current so as to limit the first current at about zero, and maintains the value of the second current at a predetermined value larger than zero. When the voltage across the load exceeds the second voltage, the two-terminal current controller switches off. Therefore, the present invention can increase a power factor of the LED lighting device, take account of operational voltage range and brightness, and can provide over voltage protection.

Description

technical field [0001] The invention relates to a double-terminal current controller and a light-emitting diode lighting device, in particular to a double-terminal current controller and a light-emitting diode lighting device that can improve power factor and provide overvoltage protection. Background technique [0002] Compared with traditional incandescent light bulbs, light emitting diodes (LEDs) have the advantages of low power consumption, long component life, small size, no need for warm-up time, and fast response, and can be made to meet application requirements. Small or array-like components. In addition to outdoor displays, traffic sign lights, various consumer electronics products, such as mobile phones, notebook computers or LCD screen backlights for TVs, LEDs are also widely used in various indoor and outdoor lighting devices, To replace fluorescent tubes or incandescent bulbs. [0003] Please refer to figure 1 , figure 1 It is a voltage (V)-current (I) char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/347Y02B20/42
Inventor 江永欣李怡玫阿尔韦托乔瓦尼·维维安尼
Owner IML HONG KONG LTD