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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 load driving efficiency and reducing current limiting loss

Active Publication Date: 2015-07-08
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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Please refer to the attached Figure 2a , is a schematic diagram of a load driving circuit disclosed in the present invention, mainly including: a load set A, a regulator set B, a current limiting circuit 11 , a current control circuit 12 , a current sampling circuit 13 and a DC voltage source 14 .

[0052] The load set A that needs to be driven includes a plurality of loads connected in series, and the load may be a light emitting diode (LED). In this embodiment, the load set A can be divided into load sub-sets A1 , A2 . . . At least one load is included in each load subset.

[0053] like Figure 2a As shown, in this embodiment disclosed in the present invention, the entire load set A includes x LEDs, ie LED1-LEDx, and the x LEDs are connected in series, that is, the x LEDs are connected in series with positive and negative terminals end to end. In this embodiment disclosed in the present invention, a better situation is adopted, that is, according to the division m...

example 1

[0072] like image 3 shown in Figure 2a On the basis of , the current limiting circuit 11 can be a constant current diode D1 , and the current limiting point of the constant current diode D1 is the preset current limiting point of the current limiting circuit 11 . In a preferred case of Example 1, the current limiting point of the constant current diode D1 is close to the rated current of the load set A.

[0073] When the DC voltage source 14 fluctuates within a certain range, if the DC voltage of the DC voltage source 14 is greater than or equal to the rated voltage drop U of the load set A, at this time, the constant current diode D1 works in a current-limiting state, that is, adjusts its own impedance, The total current of the load set A is finally constant at the current limiting point of the constant current diode D1, and the voltage difference between the DC voltage and all load subsets is borne by the constant current diode D1, so as to ensure the voltage on the load ...

example 2

[0076] like Figure 4 shown in Figure 2a 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 on the parallel overall circuit of the load set A and the adjusting tube set B; the current-limiting control circuit 112 is used to set a preset current-limiting point, and by sampling the current on the branch where the current-limiting tube 111 is located The current controls the working state and impedance of the current limiting tube 111 .

[0077] After the current limiting control circuit 112 samples the current on the branch where the current limiting tube 111 is obtained, it is judged whether the sampled current value is greater than or equal to the preset current limiting point, if so, the current limiting control circuit 112 controls the current limiting tube The working state of 111 tends to be linear, even if the impedance of the ...

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PUM

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Abstract

The invention discloses a load drive circuit. The load drive circuit comprises a light-emitting diode (LED) load set, a current-control circuit, a current-sampling circuit, a limited current circuit, a compensating pipe set and a direct current voltage source. The limited current circuit is enabled to be connected with a parallel main loop of the LED load set and the compensating pipe set in series, and a load integrated current of the whole circuit is controlled by means of the limited current circuit, the current-control circuit, the current-sampling circuit and the compensating pipe set. The load drive circuit effectively reduces the consumption of the limited current circuit when the limited current circuit limits the current under the condition of large fluctuation of the network voltage and achieves the purpose of improving load drive efficiency.

Description

technical field [0001] The present invention relates to the lighting field, and more specifically relates to a load driving circuit. Background technique [0002] In the field of lighting, LED (Light Emitting Diode, light-emitting diode) light source is currently developing rapidly. For the LED light source with AC input, the most common driving scheme is AC / DC (Alternating Current / Direct Current, AC / DC) The switching power supply realizes the constant current driving of 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 relatively complicated control chip. Therefore, for some low-power LED light sources, the switching power supply is used for constant current driving, and the volume of the driving circuit is relatively large, and the cost is relatively large. Also relatively high. Therefore, the general use of figure 1 The simple LED constant current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 华桂潮葛良安
Owner INVENTRONICS HANGZHOU