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Charging circuit and LED driving circuit

A charging circuit and charging voltage technology, applied in the direction of electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of insufficient working voltage for LED drive circuits, decreased resolution, and short turn-on time

Active Publication Date: 2019-04-30
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the on-time of one cycle of the high-frequency PWM signal is very short, which is not enough to establish the working voltage required by the LED drive circuit, resulting in a decrease in the resolution of the LED.

Method used

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  • Charging circuit and LED driving circuit
  • Charging circuit and LED driving circuit
  • Charging circuit and LED driving circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] Optionally, see figure 2 , in another specific embodiment of the present application, an implementation of the first charging unit 201 includes:

[0036] The first terminal is connected to the third switching tube N3 of the first input voltage VBAT1 through the second current source IBIAS2, the second terminal of the third switching tube N3 is grounded, and the control terminal of the third switching tube N3 is connected to the third switching tube N3 of the third switching tube N3. connected at one end. The control terminal of the third switching tube N1 outputs the charging voltage VA.

[0037] It should be noted that the third switching transistor N3 is an NMOS transistor, wherein the first end is the drain of the MOS transistor, the second end is the source of the MOS transistor, and the control end is the gate of the MOS end. Other units use this description method.

[0038] Since the gate of the third switching transistor N3 is connected to the drain, and the ...

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PUM

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Abstract

The invention provides a charging circuit and an LED driving circuit. The charging circuit includes a first charging unit used for receiving a first input voltage and outputting charging voltage according to the first input voltage, and a second charging unit which is connected to the first charging unit and is used for receiving second input voltage, third input voltage and charging voltage, wherein when the charging voltage decreases, the second charging unit increases and outputs the charging voltage according to the second input voltage and the third input voltage. According to the invention, the establishment of the charging voltage is accelerated by the second charging unit, and therefore, sufficiently large charging voltage can be provided to drive an LED in a short on time.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a charging circuit and an LED driving circuit. Background technique [0002] A light emitting diode (Light Emitting Diode, LED) is a solid-state semiconductor device that can convert electrical energy into visible light. LEDs of various light colors are widely used in traffic lights and large-area display screens. As LED lights are more and more widely used, the requirements for the resolution of LED lights are getting higher and higher. [0003] In the prior art, pulse width modulation (Pulse Width Modulation, PWM) signals are usually used to control the LEDs to obtain different levels of driving current, so as to achieve higher resolution. In the LED driving circuit, the higher the frequency of the PWM signal used, the more levels of driving current the LED lamp can obtain, and thus the higher the resolution of the LED lamp. However, the turn-on time of one cycle of the hi...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00Y02B20/40
Inventor 吴斯敏殷晓文杜黎明孙洪军
Owner SHANGHAI AWINIC TECH CO LTD