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Load drive circuit

A load driving circuit and circuit technology, applied in the field of lighting, can solve the problems of reducing LED driving efficiency and large current limiting loss, and achieve the effect of improving LED driving efficiency and reducing current limiting loss.

Active Publication Date: 2012-12-19
INVENTRONICS HANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention provides a load driving circuit to overcome the large power loss due to the use of a linear current limiting circuit to limit the current of the LED set when the grid voltage fluctuates greatly in the prior art, reducing the LED's The problem of drive efficiency

Method used

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Examples

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Embodiment 1

[0093] See attached figure 2 , Is a schematic diagram of a load driving circuit disclosed in the present invention, which mainly includes: load set A, regulator set B, current limiting circuit 11, current control circuit 12, current sampling circuit 13 and DC voltage source 14.

[0094] The load set A that needs to be driven is composed of at least one load sub-set including light emitting diode LED (LED is the load), such as figure 2 As shown, in this embodiment, the load set includes load subsets A1, A2...An, where n is greater than 1.

[0095] At least one LED is included in each load subset. Such as figure 2 As shown, the LEDs in the entire load set include: LED1 to LEDx, and the load subset A1 includes: LED1 to LEDa. The load subset A2 adds several LEDs to the load subset A1, such as figure 2 As shown, in fact, the LEDs in the load subset A2 include: LED1-LEDb, and so on, the LEDs in the load subset An include: LED1-LEDn, where the number of loads x>n>b>a.

[0096] The curre...

example 1

[0109] Such as image 3 Shown in figure 2 On the basis of, the current limiting circuit 11 may be a constant current diode D1, and the current limiting point of the constant current diode D1 is close to the rated current of the load set A.

[0110] Within the range of grid voltage fluctuations, if the DC voltage of the DC voltage source is greater than or equal to the voltage drop U when the load set A is working at the preset current limit point, the voltage difference between the DC voltage and all load subsets is determined by the constant current diode D1 To withstand, in order to ensure that the voltage drop on the load set A is still U, so that the current of the load set A is finally constant at the current limit point of the constant current diode D1. Conversely, if the DC voltage is less than the voltage drop U when all the loads collectively work at the corresponding preset current limit point, the constant current diode D1 at this time will not function as a current li...

example 2

[0112] Such as Figure 4 Shown in figure 2 On the basis of, the current limiting circuit 11 can be composed of a current limiting tube 111 and a current limiting control circuit 112. The current limiting tube 111 is connected in series with the load set A, and the current limiting control circuit 112 is used to pass through the branch where the sampling current limiting tube 111 is located. The current of φ controls the working state of the current limiting tube 111.

[0113] The current-limiting control circuit 112 samples the current on the branch where the current-limiting tube 111 is located, and determines whether the sampled current value is greater than or equal to the preset current-limiting point corresponding to the regulator tube, and if so, the current-limiting tube 111 is controlled to work in a linear conduction state , And the larger the current value, the greater the conduction resistance of the current limiting tube, which can make the load set A finally work at ...

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PUM

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Abstract

The invention discloses a load drive circuit, which comprises a current control circuit, a current sampling circuit, a current limiting circuit, a compensating pipe set and a direct current voltage source, wherein a load current value of a load set is controlled to be smaller than or equal to a preset current limiting point through the current limiting circuit within a voltage fluctuation range of a power grid into which the load drive circuit is accessed; the current control circuit receives a current signal of the load set sampled by the current sampling circuit, judges whether a current value of the current signal is greater than or equal to a preset current stabilizing point, and controls on / off of each sub-compensating pipe in the compensating pipe set connected to the load set according to a judgment result. Control of a current of the load set in the whole circuit can be finished through the current control circuit, the current sampling circuit and the compensating pipe set even if the voltage fluctuation range of the power grid is larger; current limiting loss of the current limiting circuit is reduced when the voltage fluctuation range of the power grid is larger, and the purpose of improving load driving efficiency is achieved.

Description

Technical field [0001] The present invention relates to the field of lighting, and more specifically to a load driving circuit. Background technique [0002] In the field of lighting, LED (Light Emitting Diode) light sources are currently developing rapidly. For AC input LED light sources, the most common driving scheme is to use AC / DC (Alternating Current / Direct Current, AC / DC) The switching power supply realizes the constant current drive to the LED. [0003] Since the switching power supply contains magnetic components, it needs to solve the problem of high-frequency electromagnetic interference, and requires a more complicated control chip. Therefore, for some low-power LED light sources, the switching power supply is used for constant current drive, and the volume of the drive circuit is relatively large and costly. It is also relatively high. Therefore, generally use such as figure 1 The simple LED constant current drive circuit shown drives the LED light source. [0004] in...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 华桂潮葛良安
Owner INVENTRONICS HANGZHOU