A Temperature Detection Circuit Based on Transformer Isolation

A technology of temperature detection circuit and transformer, which is applied in thermometers, thermometers and instruments using electrical/magnetic components directly sensitive to heat, etc., can solve problems such as isolation, and achieve the effect of simple circuit structure and improved safety and reliability.

Active Publication Date: 2017-02-15
TIANJIN RES INST OF ELECTRIC SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a temperature detection circuit based on transformer isolation, and solve the isolation problem when measuring the temperature of an object that needs electrical isolation

Method used

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  • A Temperature Detection Circuit Based on Transformer Isolation
  • A Temperature Detection Circuit Based on Transformer Isolation

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Embodiment Construction

[0016] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] A temperature detection circuit based on transformer isolation, such as figure 2 As shown, it includes a control chip, a resistor R1, a capacitor C1, an isolated sampling unit 1, and a voltage signal generating unit 2. The control chip is an integrated control chip with at least one switch output port and at least one analog input port. The switching value output port of the control chip sends out a square wave signal with a certain frequency and duty cycle. After passing through the series circuit of the resistor R1 and the capacitor C1, it is respectively connected to the isolated sampling unit and the voltage signal generation unit. The output signal of the voltage signal generation unit Connected to the analog input port of the control chip, the control chip obtains the real-time temperature of the measured object through table look...

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Abstract

The invention relates to a temperature detection circuit based on transformer isolation. The temperature detection circuit is technically characterized by comprising a control chip, a current-limiting resistor R1, a blocking capacitor C1, an isolation sampling unit and a voltage signal generating unit, an on-off output port of the control chip is connected with the current-limiting resistor R1, the resistor R1 and the blocking capacitor C1 are serially connected and then connected onto the isolation sampling unit and the voltage signal generating unit respectively, an output signal of the voltage signal generating unit is connected to an analog input port of the control chip. A thermistor can be isolated from a control circuit through a transformer, the temperature of an object needing electrical isolation is measured, measuring safety and measuring reliability are improved, and the circuit is simple in structure.

Description

technical field [0001] The invention belongs to the technical field of temperature detection, in particular to a temperature detection circuit based on transformer isolation. Background technique [0002] A thermistor is a temperature-sensitive electronic component that exhibits different resistance values ​​at different temperatures. According to different temperature coefficients, thermistors are divided into positive temperature coefficient thermistors (PTC) and negative temperature coefficient thermistors (NTC). The smaller the resistance value. By accurately measuring the resistance value of the thermistor, the temperature of the thermistor, that is, the object under test, can be determined. [0003] At present, the basic circuit using thermistor to detect temperature is as follows: figure 1 As shown, the temperature detection circuit is powered by a reference voltage source U1, divided by a resistor R1 with a known resistance value and the thermistor RT, and then de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/24
Inventor 赵泽生张向前楚子林贺永鹏徐莉
Owner TIANJIN RES INST OF ELECTRIC SCI
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