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A kind of tl431 application power supply circuit structure and voltage stabilization method and application

A technology of power supply lines and voltage regulator tubes, applied in electrical components, regulating electrical variables, conversion devices for output power, etc., can solve problems such as input voltage limitation

Active Publication Date: 2020-10-27
XIAN MICROELECTRONICS TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a TL431 application power supply line structure and voltage stabilization method and application, which solves the problem of input voltage limitation in the typical application power supply line of TL431, and can be applied to applications with an input voltage of 20V to 50V. range and electronic systems in the range of 80V to 120V

Method used

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  • A kind of tl431 application power supply circuit structure and voltage stabilization method and application
  • A kind of tl431 application power supply circuit structure and voltage stabilization method and application
  • A kind of tl431 application power supply circuit structure and voltage stabilization method and application

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Embodiment 1

[0032] The invention is applied to an electronic system with an input range of 20V to 50V, a typical input voltage of 28V, an output voltage of 15V, and a DC / DC converter with an output power of 30W. In this application, the regulated value of Zener tube Z1 is 24V. When V in When the input voltage of the port is less than 24V, the input voltage directly provides current to the base of the triode Q2 after passing through the current limiting resistor R3, and the regulator Z1 does not work. At this time, the emitter of the transistor Q2 is forward-biased and the collector is reverse-biased, and the transistor Q2 works in the amplification region to provide the required working current for the three-terminal programmable precision reference source U1. V out After the output voltage of the port passes through the sampling resistor R1 and the sampling resistor R2, the V out The change of the output voltage of the port is reflected to the reference terminal of the programmable pr...

Embodiment 2

[0034] The structure of the present invention is also applied to a DC / DC converter with an input range of 80V-120V, and the usage method is the same as that of Embodiment 1.

[0035] In addition, according to different input voltage ranges, transistors Q2 with different withstand voltages can be selected. For example, when the input voltage range of the electronic system is 20V to 50V, Q2 selects a triode with a withstand voltage of 80V, and Q1 selects a MOS tube with a withstand voltage of 100V, fully considering the safety and reliability of the electronic system.

[0036] The new TL431 power supply circuit structure proposed above has been put into the design of 20V~50V series and 80V~120V military DC / DC converters, which solves the input voltage limitation of TL431 series regulator and broadens its application range.

[0037] The TL431 application power supply circuit structure of the present invention solves the problem of input voltage limitation in the typical applicati...

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Abstract

A TL431 application power supply line structure and voltage stabilization method and application of the present invention, the input voltage terminal is connected to one end of the current limiting resistor R3, the collector of the triode Q2 and the drain of the MOS tube Q1; the other end of the current limiting resistor R3 is connected to the cathode of the voltage regulator tube Z1 and The base of the transistor Q2, the anode of the Zener tube Z1 are grounded, the emitter of the transistor Q2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the gate of the MOS transistor Q1 and the output end of the three-terminal programmable precision reference source U1; three terminals The anode of the programmable precision reference source U1 is grounded, the reference terminal is connected to one end of the sampling resistor R1 and one end of the sampling resistor R2, the other end of the sampling resistor R2 is grounded, the other end of the sampling resistor R1 is connected to the source of the MOS transistor Q1, and the source of the MOS transistor Q1 Extremely system internal power supply terminal. By adjusting the cathode of the three-terminal programmable precision reference source U1, the output voltage can be stabilized. It solves the limitation problem of input voltage in the typical application power supply line of TL431.

Description

technical field [0001] The invention belongs to the field of power supply lines, and in particular relates to a TL431 applied power supply line structure, voltage stabilizing method and application. Background technique [0002] The power supply line is often used for the power supply of each control function unit circuit in the electronic system, which is a necessary condition for the normal operation of each functional unit of the electronic system. Electronic engineers have always paid more attention to the power supply lines in electronic systems, for example, the linear regulated power supply line structure and the constant current power supply line structure are the most commonly used. In terms of device application, the three-terminal programmable precision reference source (TL431) has a simple application circuit structure due to its output voltage programmable control and built-in reference source. There are relatively many studies on the application of TL431 in po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56H02M3/00H02M3/335
CPCG05F1/56H02M3/00H02M3/335H02M1/0045H02M1/0083
Inventor 刘红霞王凯李翠许拴拴王俊峰王英武
Owner XIAN MICROELECTRONICS TECH INST