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Circuit capable of adjusting reference voltage drop initial temperature point, and LED constant-current driving power supply chip

A technology of reference voltage and starting temperature, which is applied in the field of adjustable circuit of the starting temperature point of reference voltage drop and LED constant current drive power chip, and can solve the problems of chip setting of the starting temperature point of output current, etc.

Active Publication Date: 2018-05-25
CRM ICBG (WUXI) CO LTD
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  • 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

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  • Circuit capable of adjusting reference voltage drop initial temperature point, and LED constant-current driving power supply chip
  • Circuit capable of adjusting reference voltage drop initial temperature point, and LED constant-current driving power supply chip
  • Circuit capable of adjusting reference voltage drop initial temperature point, and LED constant-current driving power supply chip

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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...

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Abstract

The invention provides a circuit capable of adjusting a reference voltage drop initial temperature point, and an LED constant-current driving power supply chip. The circuit capable of adjusting the reference voltage drop initial temperature point comprises an initial voltage generation module, a set voltage generation module, a first comparison voltage generation module and a reference voltage generation module; the set voltage generation module comprises a first current source and a first resistor; the first current source and the first resistor are connected in series; one end of the first current source away from the first resistor is connected with power supply voltage; and one end of the first resistor away from the first current source is grounded. According to the circuit capable ofadjusting the reference voltage drop initial temperature point provided by the invention, on the premise that the curve slope that reference voltage drops along with increasing of temperature is constant, the initial temperature point that reference voltage drops along with increasing of temperature is changed by changing of the resistance value of the first resistor.

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

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Application Information

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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