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Resistance measuring circuit, temperature detecting circuit and charging gun

A temperature detection circuit and resistance measurement technology, which is applied in the electronic field, can solve problems such as inaccurate resistance measurement, and achieve the effects of interference suppression, signal detection, and increased signal-to-noise ratio

Active Publication Date: 2019-05-17
KEHUA DATA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a resistance measurement circuit, a temperature detection circuit and a charging gun, aiming to solve the problem of inaccurate resistance measurement in the prior art

Method used

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  • Resistance measuring circuit, temperature detecting circuit and charging gun
  • Resistance measuring circuit, temperature detecting circuit and charging gun
  • Resistance measuring circuit, temperature detecting circuit and charging gun

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 1 The structure of the resistance measuring circuit provided by an embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0032] like figure 1 As shown, the resistance measurement circuit 100 provided by the embodiment of the present invention is used to measure the resistance value of the measured resistance, and includes a current limiting resistance module 110 , a switch module 120 and a sampling module 130 .

[0033] The first end of the measured resistance is connected to the power supply voltage VCC1, the second end of the measured resistance is connected to the first end of the current limiting resistance module 110 and the input end of the sampling module 130, and the second end of the current limiting resistance module 110 is passed through The switch module 120 is grounded.

[0034] The switch module 120 is turned o...

Embodiment 2

[0072] like figure 2 As shown, the embodiment of the present invention also provides a temperature detection circuit, including a thermistor PT and a resistance measurement circuit connected to the thermistor PT for measuring the resistance value of the thermistor PT as described in Embodiment 1 100, the thermistor PT is the measured resistance.

[0073] The model of the thermistor PT is PT1000.

[0074] In one embodiment, the on-off switching of the switch module 120 in the resistance measurement circuit 100 is controlled according to whether temperature measurement is required.

[0075] The on-off switching of the switch module 120 can also be determined by the preset time period of temperature collection, for example, when the temperature needs to be collected, the switch module 120 switches continuously, and when the temperature does not need to be collected, the switch module 120 remains off.

[0076] It can be understood that since the rated power of the PT1000 is at ...

Embodiment 3

[0080] like image 3 As shown, the embodiment of the present invention also provides a charging gun, which is characterized in that it includes a preset number of temperature detection circuits as described in Embodiment 2, wherein a thermistor is installed inside the charging gun for measuring The internal temperature of the charging gun.

[0081] like image 3 As shown, in one embodiment of the present invention, the charging gun includes two temperature detection circuits, wherein two thermistors are respectively used to measure the temperature of the positive bus and the negative bus inside the charging gun.

[0082] In one embodiment, the thermistor PT1 is attached to the positive bus bar inside the charging gun, and the thermistor PT2 is attached to the negative bus bar inside the charging gun.

[0083] Among them, such as image 3 As shown, the connection mode of the thermistor in the charging gun is as follows: the first end of the thermistor PT1 is drawn out through ...

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Abstract

The invention discloses a resistance measuring circuit, a temperature detecting circuit and a charging gun. The resistance measuring circuit includes a current-limiting resistance module, a switch module and a sampling module, the switch module is on and off according to a preset period, when the switch module is on, the current-limiting resistance module is connected to the ground, and a currentflows through a tested resistor; when the switch module is off, the current-limiting resistance module is disconnected to the ground, and no current flows through the tested resistor; in an on-off period of the switch module, the time of turning-on and turning-off is adjusted, and thus the time that the current flows through the tested resistor is changed so as to keep the power of the tested resistor in a preset range. The sampling module is used for sampling the voltage of the current-limiting resistance module, and a sampling voltage is output; and the sampling voltage is used for calculating the resistance of the tested resistor. According to the resistance measuring circuit, the temperature detecting circuit and the charging gun, a discontinuous sampling method is adopted, it can be guaranteed that current passing through the tested resistor is increased in a short time under the condition that the power of the tested resistor is not increased, the partial voltage of the tested resistor is increased, thus the signal-to-noise-ratio is increased, and the accuracy of testing is improved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a resistance measuring circuit, a temperature detecting circuit and a charging gun. Background technique [0002] The charging gun is a commonly used connector for high-power charging equipment. The temperature of the charging gun needs to be monitored during use to avoid the danger of overheating. At present, temperature measurement is generally realized by a thermistor, and the commonly used thermistor is PT1000. The characteristics of PT1000 are that at 0°C, the resistance value is 1000Ω, the rated power level is mW level, and the current flowing generally is below 0.3mA. The operating temperature of the charging gun is generally between -20°C and 85°C. At this time, the thermistor ranges from 922Ω to 1328Ω, and the resistance value changes to about 400Ω. If calculated according to the flowing current of 0.1mA, the actual sampled voltage variation range is 40mV. It can...

Claims

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Application Information

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IPC IPC(8): G01R27/14G01K7/24
Inventor 牛兴卓
Owner KEHUA DATA CO LTD
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