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Peak current correction compensation circuit and step-down drive LED circuit with same

A technology of LED circuit and compensation circuit, which is applied in the direction of electrical components, etc., can solve the problems of LED lamp LED current error range, no solution proposed, LED current difference, etc., and achieve the effect of precise control of LED current

Active Publication Date: 2021-02-19
深圳市东准电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when this new type of LED drive circuit is used as a general-purpose LED drive circuit, there is a problem that the corresponding LED current will be different due to the different voltages of the LED lamps it drives, which makes it impossible to guarantee that the LED drive circuit will be driven by this new type of LED. The LED currents of LED lamps with different voltages driven by the circuit are all within the error range, that is, there is a problem that the LED current cannot be accurately controlled
For example, it is also driven by this new type of LED drive circuit, but if the voltage difference between the two LED lamps is doubled, the corresponding drive currents of the two will differ by about 10%, which obviously cannot meet the customer's current error requirements Requirements within 5%
[0004] For the above problems, no effective solution has been proposed

Method used

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  • Peak current correction compensation circuit and step-down drive LED circuit with same
  • Peak current correction compensation circuit and step-down drive LED circuit with same
  • Peak current correction compensation circuit and step-down drive LED circuit with same

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Experimental program
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Effect test

Embodiment 1

[0027] figure 1 It is a circuit schematic diagram of a buck drive LED circuit with critical continuous operation in peak current mode, figure 1 Middle V IN is the input voltage, V 0 Refers to the LED voltage, Q refers to the MOS field effect transistor, L refers to the energy storage inductor, C refers to the filter capacitor, LED refers to the LED lamp, D refers to the freewheeling diode of L, and QD refers to the driving signal of the MOS transistor Q , RS refers to the current sampling resistor, CS refers to the voltage signal on the current sampling resistor RS, which represents the magnitude of the current, and ZVS refers to the MOS tube drain zero voltage detection signal.

[0028] This embodiment simply analyzes figure 1 The working process of the middle circuit:

[0029] (1) Please refer to figure 2 and image 3 , starting from time t0, the MOS transistor (Q) is driven to conduct, and the input voltage (V IN ) starts to supply power to the LED lamp (LED), and a...

Embodiment 2

[0087] Embodiment 2 of the present invention provides a buck driving LED circuit, including the peak current correction and compensation circuit as described in Embodiment 1.

[0088] A step-down drive LED circuit provided by an embodiment of the present invention can ensure that different voltages are driven by superimposing the filtered voltage of the MOS transistor drain on the step-down drive LED circuit through a resistor network as compensation to the current sampling signal of the control circuit. The LED current is within the error range when the LED light is on, and the purpose of accurately controlling the LED current can be achieved, which can well meet customer requirements.

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Abstract

The invention discloses a peak current correction compensation circuit and a step-down drive LED circuit with the same. The peak current correction compensation circuit comprises a divider resistancenetwork and a filter capacitor; the divider resistance network is connected between a drain electrode and a source electrode of an MOS tube on a voltage reduction driving LED circuit and is formed bysequentially connecting a first divider resistor, a second divider resistor and a third divider resistor in series. One end of the filter capacitor is connected to the common end of the first dividerresistor and the second divider resistor, and the other end is grounded; and the common end of the second divider resistor and the third divider resistor is connected to the current sampling signal input end of a control circuit on the step-down driving LED circuit. According to the invention, the voltage filtered by the drain electrode of the MOS transistor on the voltage reduction driving LED circuit is used as compensation to be superposed on the current sampling signal of the control circuit through the resistance network, so that the LED current can be ensured to be in an error range whenLED lamps with different voltages are driven, the purpose of accurately controlling the LED current is achieved, and the requirements of customers can be well met.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a peak current correction and compensation circuit and a step-down driving LED circuit having the same. Background technique [0002] The buck drive LED circuit with critical continuous operation in peak current mode is a new type of LED drive circuit, which controls the LED current by controlling the peak current of the energy storage inductor. It is especially suitable for driving high-voltage LED lamps. It has simple and reliable control. , The MOS tube can naturally realize the advantages of soft switching, high efficiency and low cost. [0003] However, when this new type of LED drive circuit is used as a general-purpose LED drive circuit, there is a problem that the corresponding LED current will be different due to the different voltages of the LED lamps it drives, which makes it impossible to guarantee that the LED drive circuit will be driven by this new type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/10H05B45/345
Inventor 杨东平
Owner 深圳市东准电子科技有限公司