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Overheating protection circuit and electronic device with overheating protection function

A technology for overheating protection circuits and electronic devices, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as the influence of reliability and tolerance of circuit components, the impact of circuit voltage drop, etc., to avoid reliability effect on tolerance

Active Publication Date: 2016-12-21
QISDA SUZHOU +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the function of temperature compensation on the circuit is usually an integrated circuit that needs to use a thermistor and an amplifier, or directly design an integrated circuit to control voltage or current for temperature compensation, and these two methods are used in the process of temperature compensation. , will affect the circuit voltage drop on the line, so that the voltage of the circuit components on the line will be changed to change the characteristics of the circuit components, which will affect the reliability and tolerance of the circuit components

Method used

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  • Overheating protection circuit and electronic device with overheating protection function
  • Overheating protection circuit and electronic device with overheating protection function
  • Overheating protection circuit and electronic device with overheating protection function

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Embodiment Construction

[0018] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

[0019] figure 1 It is a schematic diagram of an overheating protection circuit provided by an embodiment of the present invention. Such as figure 1 As shown, the overheating protection circuit includes: a first thermistor R29, a field effect transistor Q5 and a second thermistor R30. The first thermistor R29 has a negative temperature coefficient, the field effect transistor Q5 includes a source S, a drain D and a gate G, and the second thermistor R30 has a positive temperature coefficient. One end 11 of the first thermistor R29 is connected to the power supply terminal 100, the other end 12 of the first thermistor R29 is connected to the gate G of the field effect transistor Q5, and the source S of the field effect transistor Q5 is connected to the first thermistor...

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Abstract

The invention provides an overheating protection circuit and an electronic device with an overheating protection function. The overheating protection circuit comprises a first thermistor, a field effect transistor and a second thermistor, wherein the first thermistor has a negative temperature coefficient, and one end of the first thermistor is connected with a power supply end; the field effect transistor comprises a source, a drain and a gate, the source is connected with the one end of the first thermistor, the drain is connected with a target end, and the gate is connected with the other end of the first thermistor; the second thermistor has a positive temperature coefficient, one end of the second thermistor is connected with the gate, the other end of the second thermistor is set, so that when a first resistance value of the first thermistor is reduced and a second resistance value of the second thermistor is increased due to heating of the first thermistor and the second thermistor, voltage between the gate and the source is reduced, then current input into the target end from the drain is reduced, and the temperature rising process is decelerated.

Description

technical field [0001] The invention relates to the field of overheat protection, in particular to an overheat protection circuit and an electronic device with an overheat protection function. Background technique [0002] At present, the function of temperature compensation on the circuit is usually an integrated circuit that needs to use a thermistor and an amplifier, or directly design an integrated circuit to control voltage or current for temperature compensation, and these two methods are used in the process of temperature compensation. , will affect the circuit voltage drop on the line, so that the voltage of the circuit element on the line will be changed to change the characteristics of the circuit element, and then the reliability and tolerance of the circuit element will be affected. Contents of the invention [0003] The object of the present invention is to provide an overheating protection circuit and an electronic device with overheating protection function,...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 游朝顺
Owner QISDA SUZHOU
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