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Wide range platinum resistor temperature sampling circuit

A technology of sampling circuit and platinum resistance, applied in thermometers, thermometers using electric/magnetic elements that are directly sensitive to heat, and electric devices, can solve problems such as troubles, improve accuracy, overcome voltage divider resistance mismatch, The effect of high-precision temperature sampling

Active Publication Date: 2019-04-05
无锡华宸控制技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

cumbersome in practical industrial applications

Method used

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  • Wide range platinum resistor temperature sampling circuit
  • Wide range platinum resistor temperature sampling circuit
  • Wide range platinum resistor temperature sampling circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] image 3Shown is the equivalent circuit diagram of the temperature sampling circuit when the PT100 temperature sensor is connected, the processor chip sends the PT100_control control signal, the high level is active, the first transistor Q1 and the third transistor Q3 are NPN transistors, so that It works in the saturation region. When PT100_control outputs a high level, the base-emitter of the first triode Q1 and the third triode Q3 are forward-biased, the two triodes are turned on, the voltage of the power supply VB is 5V and the power supply VB is pulled up through the base of Q2 Resistor R6, Q3 collector load resistor R7 and the third transistor Q3 form a loop, Q2 base pull-up resistor R6, Q3 collector load resistor R7 can be regarded as the collector load resistor of the third transistor Q3, the first The collector current of the triode Q3 is:

[0029]

[0030] In the formula, V ce_Q3 is the collector-emitter saturation turn-on voltage drop of the third trans...

Embodiment 2

[0038] Figure 4 Shown is the equivalent circuit diagram of the temperature sampling circuit when the PT1000 temperature sensor is connected, its principle is similar to that of PT100, the control signal of the PT1000 temperature sensor is sent by the processor chip, the third transistor Q3 is turned on, and the current flow of the turn-on loop Through the base of the second transistor Q2, the second transistor Q2 is turned on, and the internal power supply POWER terminal is pulled up; at this time, V VB =8V, according to the formula (1), (2), (3) to get V POWER ,

[0039]

[0040] At this time, the temperature sampling value V can be calculated by formula (5) AD_TEMP .

[0041] The temperature sampling circuit of the present invention is set by the third triode Q3, the second triode Q2 and the Q2 base pull-up resistor R6, the Q3 collector load resistor R7, the base current limiting resistor R8, and further through the first three The transistor Q1 and Q1 collector load...

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PUM

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Abstract

The invention discloses a wide range platinum resistor temperature sampling circuit. The wide range platinum resistor temperature sampling circuit comprises a temperature sampling resistor, a first current limiting resistor, an internal power source and a ground terminal, and further comprises a third triode and a second triode; a collector of the second triode is connected with the first currentlimiting resistor and the connection end of and the internal power source; an emitter of the second triode is connected with a power supply, and the emitter is connected with a base of the second triode through a Q2 base pull-up resistor; the base of the second triode and the connection end of the Q2 base pull-up resistor are connected with a collector of the third triode through a Q3 collector load resistor; and the emitter of the third triode is grounded, and a base of the third triode is connected with a control pin of a processor chip through a base current limiting resistor.

Description

technical field [0001] The invention relates to the technical field of temperature sampling circuits, in particular to a wide-range platinum resistance temperature sampling circuit that can overcome the failure of the temperature sampling circuit caused by the mismatch of voltage dividing resistors and is compatible with different temperature sensors. Background technique [0002] The temperature sampling circuit has a very important impact on the operation of industrial equipment. Under different working conditions, it has different requirements for the accuracy and sampling range of temperature sampling. Common temperature sensors such as PT100 and PT1000 have large differences in the resistance value of platinum thermal resistance at different temperatures. The temperature changes by one degree, the resistance value of PT100 increases or decreases by about 0.38 ohms, and the resistance value of PT1000 increases or decreases by about 3.8 ohms. The selection of the matching...

Claims

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Application Information

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IPC IPC(8): G01K7/20
CPCG01K7/20
Inventor 许猛项财生陈守川
Owner 无锡华宸控制技术有限公司
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