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Transistor temperature sensing circuit and voltage regulator having over-temperature protection function

A technology of temperature sensing circuit and transistor, which is applied in the direction of circuit devices, emergency protection circuit devices, parts of emergency protection devices, etc., and can solve the problems of overheating damage of voltage regulators without overtemperature protection function, high temperature damage of generators, etc. problems, to achieve obvious economic and social benefits, reliable work, and low cost

Inactive Publication Date: 2018-02-02
佛山中锦微电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing automotive generator voltage regulators generally do not have an over-temperature protection function. When the working environment temperature of the generator is too high, it often leads to high-temperature damage to the generator or overheating damage to the voltage regulator.

Method used

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  • Transistor temperature sensing circuit and voltage regulator having over-temperature protection function
  • Transistor temperature sensing circuit and voltage regulator having over-temperature protection function
  • Transistor temperature sensing circuit and voltage regulator having over-temperature protection function

Examples

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Effect test

Embodiment 1

[0044] Such as figure 1 As shown, the basic structure of this transistor temperature sensing circuit includes a transistor detection unit 101 and a temperature correction unit 102. The transistor detection unit has a transistor Q101 sensitive to the temperature range to be measured. The transistor Q101 is an NPN transistor, and the temperature correction unit is a temperature correction unit. The resistor R101, and the temperature correction resistor R101 is connected in parallel with the emitter junction of the transistor Q101, and is used to correct the relationship curve between the on-resistance of the transistor and the sensed ambient temperature.

Embodiment 2

[0046] The embodiment of the present invention provides another transistor temperature sensing circuit, such as figure 2 As shown, its basic structure includes a transistor detection unit 201 and a temperature correction unit 202, the transistor detection unit has a transistor Q201 sensitive to the temperature range to be measured, the transistor Q101 is a PNP transistor, the temperature correction unit is a temperature correction resistor R201, and the temperature correction The resistor R201 is connected in parallel with the emitter junction of the transistor Q201, and is used to correct the relationship curve between the on-resistance of the transistor and the sensed ambient temperature.

[0047] In the above two embodiments, when the transistor has no base bias current, its leakage current is extremely small at normal temperature (room temperature 15-30° C.), and the leakage resistance between the collector and the emitter is generally above 1000 MΩ. Such as image 3 As ...

Embodiment 3

[0050] The block diagram of the circuit structure of the first voltage regulator with over-temperature protection function provided by the embodiment of the present invention is as follows: Figure 4 As shown, its basic structure includes a sampling unit 11 , a threshold unit 12 , an oscillation unit 14 , a transistor temperature sensing circuit 13 , a power trigger unit 15 and a freewheeling unit 16 .

[0051] The sampling unit 11 is connected to the positive and negative poles of the power supply, the output terminal of the sampling unit is connected to the input terminal of the power trigger unit 15 through the threshold unit 12, and the transistor temperature sensing circuit 13 is connected to the positive pole of the power supply and the power trigger unit. Between the input ends, the oscillation unit 14 is connected to the positive and negative poles of the power supply, the output end of the oscillation unit is connected to the input end of the power trigger unit, the ne...

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Abstract

The invention provides a voltage regulator having an over-temperature protection function. The voltage regulator comprises a sampling unit, a threshold unit, an oscillation unit, a power trigger unit,a transistor temperature sensing circuit and a freewheeling unit. The sampling unit is connected with the positive and negative electrodes of a power supply. The output end of the sampling unit is connected with the input end of the power trigger unit through the threshold unit. The transistor temperature sensing circuit is connected between the positive electrode of the power supply and the input end of the power trigger unit. The oscillation unit is connected with the positive and negative electrodes of the power supply. The output end of the oscillation unit is connected with the input endof the power trigger unit. The negative electrode of the power trigger unit is grounded. The output end of the power trigger unit is connected with the positive electrode of the power supply throughthe freewheeling unit. The output end of the power trigger unit is used for controlling generator excitation current. The power trigger unit is a power trigger having an overcurrent protection function. When the working temperature of the voltage regulator of the generator exceeds the allowable value, the transistor temperature sensing circuit is conducted and provides a trigger signal to the power trigger unit so that the power trigger unit is enabled to reduce the excitation duty ratio or cut off the excitation current.

Description

technical field [0001] The invention belongs to the technical field of automobile electronic control, in particular to a transistor temperature sensing circuit and a voltage regulator with over-temperature protection function. Background technique [0002] Existing automotive generator voltage regulators generally do not have an over-temperature protection function. When the working environment temperature of the generator is too high, it often leads to high-temperature damage to the generator or overheating damage to the voltage regulator. [0003] In the automobile maintenance industry, it is often found that the generator voltage regulator is damaged due to excessive temperature. Causes of the working environment, such as the generator being radiated by the engine temperature in the engine compartment, the resistive heating of the stator winding of the generator itself, the voltage drop heating of the rectifier bridge junction, the DC heating of the excitation winding, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/06H02H7/20H02H5/04H02H1/00
CPCH02H7/06H02H1/0007H02H5/042H02H7/205
Inventor 杨明
Owner 佛山中锦微电科技有限公司
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