Driving device and method of semiconductor light emitter group

A technology of light-emitting devices and driving devices, which can be applied to lighting devices, electroluminescent light sources, light sources, etc., and can solve the problems of insufficient speed of the feedback regulation loop, inability to adjust the impulse current, and damage to the lifespan.

Active Publication Date: 2015-05-27
DELTA ELECTRONICS SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above constant current mode, because the speed of the feedback regulation loop is not fast enough, the inrush current cannot be adjusted in time, so the inrush current will cause damage to the life of the LED.
[0007] A traditional way to avoid inrush current is to connect LED loads in series such as image 3 The positive temperature characteristic element (PTC) shown in this way is not expensive, but the introduction of PTC will lead to an increase in line impedance, which in turn will increase the loss of the line under normal operating conditions

Method used

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  • Driving device and method of semiconductor light emitter group
  • Driving device and method of semiconductor light emitter group
  • Driving device and method of semiconductor light emitter group

Examples

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no. 1 example

[0068] The following will refer to Figure 6 A more detailed circuit embodiment of driving the LED module 12 by using the driving device of the present application is described, in which the circuit structures of the constant current control unit 13 and the instant control unit 14 are specifically shown.

[0069] Such as Figure 6 As shown, the driving device according to the first embodiment of the present application includes an LED driving unit 11 connected to an LED module 12 for driving the LED module 12 . Since the structures of the LED drive unit 11 and the LED module 12 are the same as those referred to above Figure 5 The structure described is the same, so it will not be repeated here.

[0070] further reference Figure 6 , the driving device according to the first embodiment of the present application may further include a constant current control unit 13, and the constant current control unit 13 includes a current sensing part (that is, an AVG value sensing part...

no. 2 example

[0077] Different from the first embodiment in which the output of the LED driving unit 11 is controlled by adjusting the frequency, the second embodiment of the present application controls the output of the LED driving unit 111 by adjusting the duty cycle.

[0078] Such as Figure 9 As shown, the driving device according to the second embodiment of the present application includes an LED driving unit 111, a constant current control unit 13 and an instant control unit 14. The LED driving unit 111 is connected to the LED module 12 for driving the LED module 12. The constant The flow control unit 13 and the immediate control unit 14 are connected between the LED driving unit 111 and the LED module 12 to control the LED module 12 in feedback. Since the structures of the LED module 12, the constant current control unit 13 and the instant control unit 14 here are the same as those referred to above Figure 6 The structure described is the same, so it will not be repeated here.

...

no. 3 example

[0082] The above-mentioned first and second embodiments are examples of adjusting the output of the LED drive unit by controlling the operating frequency and duty cycle of the drive signal of the switching element in the drive unit by using an analog circuit method, according to the third implementation of the present application In this example, the digital signal processing unit will be used to control the operating frequency or duty cycle of the driving signal of the switching element in the driving unit, and then adjust the output of the LED driving unit.

[0083] Such as Figure 10 As shown, the driving device according to the third embodiment of the present application includes an LED driving unit 11 and an LED module 12 , and the LED driving unit 11 is connected to the LED module 12 for driving the LED module 12 . Since the structures of the LED driving unit 11 and the LED module 12 here are the same as those referred to above Figure 5 The structure described is the s...

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Abstract

The disclosure provides a driving apparatus and a method for driving a semiconductor light-emitting device assembly. The apparatus includes: a driving unit configured to drive the semiconductor light-emitting device assembly; and a cycle by cycle control unit. The cycle by cycle control unit may include: a sampling circuit configured to sample a current instantaneous value of the driving unit or the semiconductor light-emitting device assembly; and an adjusting circuit configured to adjust an output of the driving unit when the current instantaneous value sampled by the sampling circuit is larger than or equal to a preset reference value. The driving apparatus and method for driving the semiconductor light-emitting device assembly may effectively reduce an inrush current on the light-emitting devices and have a lower cost.

Description

technical field [0001] The present application relates to a driving device and a driving method for driving a semiconductor light emitting device group. Background technique [0002] With the in-depth development of semiconductor technology, semiconductor light-emitting devices such as LEDs or semiconductor lasers are gradually replacing traditional light sources and are being used more and more widely due to their advantages such as high efficiency, long life, unbreakable, and high reliability. [0003] Generally, semiconductor light emitting devices are driven using a constant current method. Taking LED as an example, figure 1 A common schematic diagram of driving LEDs with constant current is shown. exist figure 1 Among them, the LED driver 1 is used to drive the LED module 2, the constant current control unit 3 samples the average current of the LED module 2 from the sampling point A, and feeds back the average current obtained by sampling to the LED driver 1, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/46H05B45/39H05B45/385H05B45/382
Inventor 钟媛媛张伟强徐立智
Owner DELTA ELECTRONICS SHANGHAI CO LTD
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