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Segmented LED drive circuit based on low-voltage off mode

An LED driving, segmented technology, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve problems such as changes in LED load power, increase stability, reduce pressure, increase drive reliability and product life. Effect

Active Publication Date: 2016-06-08
SHINEON BEIJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This oscillation is an uncontrollable free oscillation, affected by the input voltage and noise, the oscillation of different cycles causes the LED load power to change

Method used

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  • Segmented LED drive circuit based on low-voltage off mode
  • Segmented LED drive circuit based on low-voltage off mode
  • Segmented LED drive circuit based on low-voltage off mode

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Participation figure 2 , a segmented LED drive circuit based on a low-voltage off mode, which includes: an error amplifier circuit OP, an undervoltage control circuit, a MOS transistor M0, and a current limiting resistor R0;

[0021] The error amplifier circuit OP collects the drain voltage of the MOS transistor M0 through the current-limiting resistor R0, and performs differential amplification with the reference voltage Vref to provide a voltage to the gate of the MOS transistor M0;

[0022] The under-voltage control circuit cooperates with the error amplifier circuit OP to continuously reduce the gate voltage of the MOS transistor M0 when the MOS transistor M0 is in a linear state until the MOS transistor M0 reaches a saturated state.

Embodiment 2

[0023] Example 2: Participation image 3 , a segmented LED drive circuit based on a low-voltage off mode, which includes: an error amplifier circuit OP1, an error amplifier circuit OP2, a MOS transistor M0, a current limiting resistor R0, a voltage divider resistor R1, and a voltage divider resistor R2;

[0024] The error amplifier circuit OP1, the error amplifier circuit OP2, the current limiting resistor R0, the voltage divider resistor R1, and the voltage divider resistor R2 are used to detect the drain current of the MOS transistor M0, when the When the MOS transistor M0 is in a linear state, the drain current of the MOS transistor M0 is continuously reduced until the MOS transistor M0 reaches a saturated state.

Embodiment 3

[0025] Example 3: Participation Figure 4 , a segmented LED drive circuit based on low-voltage off mode, which includes: error amplifier circuit OP1, error amplifier circuit OP2, undervoltage control circuit, MOS tube M0, current limiting resistor R0, voltage divider resistor R1, voltage divider resistor R2, voltage dividing resistor R3, and voltage dividing resistor R4 are used to detect the input voltage, and when the MOS transistor M0 is in a linear state, continuously reduce the gate voltage of the MOS transistor M0 until the MOS transistor M0 reaches a saturated state .

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PUM

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Abstract

The invention discloses a segmented LED drive circuit based on a low-voltage off mode. The segmented LED drive circuit comprises an error amplifier circuit OP, an under-voltage control circuit, an MOS tube M0 and a current-limiting resistor R0. According to the segmented LED drive circuit disclosed by the invention, through change of a control mechanism of the current-limiting MOS tube and reduction of the grid voltage, the MOS tube is prevented from being in an uncontrolled linear area, and the LED flickering problem caused by abrupt voltage change is effectively solved; during the input of abruptly-changed large voltage, the load current is effectively restrained, the stability of a driving system and the driven surge resistance are increased, the voltage of an LED chip in a harsh input voltage environment is reduced, the driving reliability is improved, and the product life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electronic display, in particular to a method for eliminating the flicker effect of LEDs and the like. Background technique [0002] LED light sources are widely used in the field of new energy-saving light sources due to their high efficiency, high integration and long life. In the practical application of LED light sources, the LED light source driving scheme without energy storage devices such as inductors and capacitors has been widely used, and has gradually become the mainstream LED light source driving scheme. In this type of driving scheme, the control IC controls the conduction current and the current of the LED light source by adjusting the gate voltage of the LED light source channel switch MOS tube to compensate for the excessive conduction current to the input voltage caused by the non-linearity of the LED light source. Sensitive, so as to achieve the purpose of current limiting. [0003] ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50H05B45/37
Inventor 冯向光吕国柱孙国喜范振灿
Owner SHINEON BEIJING TECH
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