Unlock instant, AI-driven research and patent intelligence for your innovation.

Reference voltage drop start temperature point adjustable circuit and led constant current drive power chip

A technology of reference voltage and initial temperature, which is applied in the field of adjustable reference voltage drop initial temperature point and LED constant current drive power supply chip field, which can solve the problem of output current initial temperature point chip setting and other issues

Active Publication Date: 2019-08-23
CRM ICBG (WUXI) CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an adjustable reference voltage drop starting temperature point circuit and LED constant current drive power chip, which is used to solve the problems of the LED constant current drive power chip in the prior art. The starting temperature point of the high-temperature drop of the reference voltage has been set, so that the starting temperature point of the drive power supply high-temperature drop output current cannot be set outside the chip

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reference voltage drop start temperature point adjustable circuit and led constant current drive power chip
  • Reference voltage drop start temperature point adjustable circuit and led constant current drive power chip
  • Reference voltage drop start temperature point adjustable circuit and led constant current drive power chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] see image 3 , the present invention provides a circuit that can adjust the initial temperature point of reference voltage drop, and the circuit that can adjust the initial temperature point of reference voltage drop includes: an initial voltage generating module 1, and the initial voltage generating module 1 is suitable for generating an initial Voltage Vinit, the initial voltage Vinit is a zero temperature coefficient voltage, that is, the initial voltage Vinit does not change with the change of temperature; the set voltage generation module 2, the set voltage generation module 2 includes a first current source Ibzt1 and a first current source Ibzt1 A resistor Rtsc; the first current source Ibzt1 is connected in series with the first resistor Rtsc, the end of the first current source Ibzt1 away from the first resistor Rtsc is connected to the power supply voltage Vdd, and the first resistor Rtsc is far away from One end of the first current source Ibzt1 is grounded, t...

Embodiment 2

[0106] see Figure 7 , the present invention also provides an LED constant current drive power chip 7, the LED constant current drive power chip 7 includes a circuit that can adjust the starting temperature point of the reference voltage drop as described in Embodiment 1, wherein the initial The voltage generating module 1, the first current source Ibzt1, the first comparison voltage generating module 3 and the reference voltage generating module 4 are all located inside the LED constant current drive power supply chip 7, and the first resistor Rtsc is located inside The LED constant current drives the outside of the power supply chip 7 . For the specific structure of the circuit that can adjust the starting temperature point of the reference voltage drop, please refer to Embodiment 1, which will not be repeated here.

[0107] As an example, the LED constant current drive power chip 7 also includes a temperature adjustment pin TSC and a ground pin GND; The first current sour...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a circuit with an adjustable reference voltage drop initial temperature point and an LED constant current drive power supply chip. The circuit that can adjust the reference voltage drop initial temperature point includes: an initial voltage generation module; a set voltage generation module, including A first current source and a first resistor; the first current source is connected in series with the first resistor, the end of the first current source far away from the first resistor is connected to a power supply voltage, and the first resistor is far away from the first resistor. One end of the first current source is grounded; a first comparison voltage generation module; a reference voltage generation module. The adjustable reference voltage drop starting temperature point circuit of the present invention can change the reference voltage drop with temperature rise on the premise that the slope of the curve of reference voltage drop with temperature rise is kept constant by changing the resistance value of the first resistor. the starting temperature point.

Description

technical field [0001] The invention belongs to the technical field of circuit design, in particular to a circuit with an adjustable reference voltage drop starting temperature point and an LED constant current drive power supply chip. Background technique [0002] In lighting LED lamps, the constant current drive power supply provides a stable drive current for the LED light string. In the medium and low temperature range, the drive current remains constant and does not change with temperature changes to ensure the continuous and stable brightness of the LED. The power consumed by the LED light source and the driving power itself will be converted into heat, which will increase the temperature of the lighting LED lamp. Under the condition of too high temperature, the service life of LED light source and driving power will be greatly shortened, or even burned. Therefore, when the temperature is too high, as the temperature continues to rise, the constant current drive power...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 卢圣晟刘军李国成张识博
Owner CRM ICBG (WUXI) CO LTD