CN215599257U - Measurement circuit of insulation resistance for pyroelectric sensor - Google Patents
Measurement circuit of insulation resistance for pyroelectric sensor Download PDFInfo
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- CN215599257U CN215599257U CN202120869508.0U CN202120869508U CN215599257U CN 215599257 U CN215599257 U CN 215599257U CN 202120869508 U CN202120869508 U CN 202120869508U CN 215599257 U CN215599257 U CN 215599257U
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- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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Abstract
The utility model relates to a measuring circuit of an insulation resistor for a pyroelectric sensor, which comprises a power supply circuit, a voltage dividing circuit, a signal processing circuit, a main control circuit and a comparison circuit, wherein a resistor R5 to be measured is electrically connected between the power supply circuit and the voltage circuit, the voltage dividing circuit is electrically connected with the signal processing circuit, the signal processing circuit is electrically connected with the comparison circuit, the comparison circuit is electrically connected with the main control circuit, and the power supply circuit is respectively electrically connected with the voltage dividing circuit, the signal processing circuit, the main control circuit and the comparison circuit and provides voltage. The resistance to be measured and different resistances of corresponding gears are subjected to voltage division through the voltage division circuit, the main control circuit determines the range of the resistance to be measured according to the voltage output by the voltage division circuit, and meanwhile, the voltage output by the voltage division circuit is compared with the preset reference voltage through the comparison circuit, so that the measurement range of the whole circuit is determined, the resistances with different resistance values can be measured, and the whole circuit is simple in structure and high in universality.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a measuring circuit of insulation resistance for a pyroelectric sensor.
Background
In an electronic circuit, resistors with different resistance values are usually required to be distinguished, particularly, for a resistor with a large resistance value, no obvious mark is distinguished on the resistor, and a universal meter can only measure resistors with the resistance value of 20M Ω or less generally.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a measuring circuit of insulation resistance for a pyroelectric sensor aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a pyroelectric sensor is with insulation resistance's measuring circuit, includes power supply circuit, bleeder circuit, signal processing circuit, main control circuit and comparison circuit, and resistance R5 electricity that awaits measuring is connected between power supply circuit's output and voltage circuit's input, bleeder circuit's output is connected with signal processing circuit's input electricity, signal processing circuit's output is connected with comparison circuit's input electricity, comparison circuit's output with main control unit's signal input part electricity is connected, power supply circuit respectively with bleeder circuit, signal processing circuit, main control circuit and comparison circuit electricity are connected to provide voltage.
The utility model has the beneficial effects that: according to the measuring circuit of the insulation resistor for the pyroelectric sensor, the voltage of the resistor to be measured and different resistors of corresponding gears are divided through the voltage dividing circuit, then the main control circuit determines the range of the resistor to be measured according to the voltage output by the voltage dividing circuit, meanwhile, the comparison circuit compares the voltage output by the voltage dividing circuit with the preset reference voltage, and therefore the measuring range of the whole circuit is determined, the insulation resistors for the pyroelectric sensor with different resistance values can be measured, and the whole circuit is simple in structure and high in universality.
On the basis of the technical scheme, the utility model can be further improved as follows:
further: the power supply circuit comprises a first voltage conversion circuit, a second voltage conversion circuit and an indicating circuit, wherein the input end of the first voltage conversion circuit and the input end of the second voltage conversion circuit are respectively electrically connected with an external power supply, the output end of the first voltage conversion circuit is respectively electrically connected with the power input end of a voltage division circuit and the power input end of a signal processing circuit, a resistor R5 to be tested is electrically connected between the output end of the first voltage conversion circuit and the signal input end of the voltage division circuit, the output end of the second voltage conversion circuit is respectively electrically connected with the power input end of a main control circuit and the power input end of a comparison circuit, and the indicating circuit is electrically connected between the external power supply and the ground.
The beneficial effects of the further scheme are as follows: through first voltage conversion circuit can convert external power source's voltage into 5V, thereby does bleeder circuit and signal processing circuit power supply, through second voltage conversion circuit can convert external power source's voltage into 3.3V, thereby does main control circuit and comparison circuit power supply, through indicating circuit can show external power source's power supply state, and is convenient directly perceived.
Further: the voltage dividing circuit comprises an analog switch U4, a capacitor C20, a resistor R3, a resistor R4 and a resistor R7, a power supply input end of the analog switch U4 is electrically connected with an output end of the first voltage conversion circuit, a resistor R5 to be tested is electrically connected between an output end of the first voltage conversion circuit and a signal input end of the analog switch U4, the capacitor C20 is electrically connected between a signal input end of the analog switch U4 and ground, a first input end X0 of an X channel of the analog switch U4 and a first input end Y0 of a Y channel are both grounded through the resistor R7, a second input end X1 of the X channel of the analog switch U4 and a second input end Y1 of the Y channel are both grounded through the resistor R4, a third input end X2 of the X channel of the analog switch U4 and a third input end Y2 of the Y channel are both grounded through the resistor R3, a fourth input end Y3 of the X3 of the X channel of the analog switch U4 is electrically connected with a fourth input end Y3, two address terminals A and B of the analog switch U4 are respectively and correspondingly electrically connected with two control signal output terminals of the main control circuit, and the output terminal of the analog switch U4 is electrically connected with the signal input terminal of the main control circuit.
The beneficial effects of the further scheme are as follows: through analog switch U4, can make resistance R5 that awaits measuring and corresponding resistance series connection partial pressure, then gather the obtained voltage of divider resistance, use analog switch in order to reach the purpose of automatic switch-over range to promote the resistance measuring scope.
Further: the signal processing circuit comprises an operational amplifier U5, a resistor R16, a resistor R22, a resistor R6, a resistor R18 and a capacitor C21, wherein one positive signal input end of the operational amplifier U5 is electrically connected with the output end of the voltage division circuit, one negative signal input end of the operational amplifier U5 is grounded through the resistor R16, one negative signal input end of the operational amplifier U5 is electrically connected with one output end through the resistor R22, one output end of the operational amplifier U5 is electrically connected with the signal input end of the main control circuit, the other positive signal input end of the operational amplifier U5 is electrically connected with the output end of the voltage division circuit, the other negative signal input end of the operational amplifier U5 is grounded through the resistor R18, and the other negative signal input end of the operational amplifier U5 is electrically connected with the other output end through the resistor R6, the other output end of the operational amplifier U5 is electrically connected with the input end of the comparison circuit, the power input end of the operational amplifier U5 is electrically connected with the output end of the first power circuit, and the power input end of the operational amplifier U5 is grounded through the capacitor C21.
The beneficial effects of the further scheme are as follows: through operational amplifier U5 to the negative feedback network that cooperation resistance R16 and resistance R22 formed is right the voltage of bleeder circuit output is enlargied, and exports to main control circuit and handles, and operational amplifier U5 cooperation resistance R6 and resistance R18 are right simultaneously the voltage that bleeder circuit output carries out the amplification of the same multiple, and main control circuit can be according to the voltage that comparison circuit exported judges the voltage size of bleeder circuit output like this to make things convenient for main control circuit output control signal, with the measuring range of switching whole circuit.
Further: the comparison circuit adopts a comparator chip U6 with the model number XD339, one negative signal input end of the comparator chip U6 is electrically connected with the output end of the signal processing circuit, one path of reference voltage end of the comparator chip U6 is connected with an external first reference voltage, one path of signal output end of the comparator chip U6 is electrically connected with one control signal input end of the main control circuit, the other negative signal input end of the comparator chip U6 is electrically connected with the output end of the signal processing circuit, the other path of reference voltage end of the comparator chip U6 is connected with an external second reference voltage, the other path of signal output end of the comparator chip U6 is electrically connected with the other control signal input end of the main control circuit, the power supply input end of the comparator chip U6 is electrically connected with the output end of the second voltage conversion circuit, and the grounding end of the comparator chip U6 is grounded.
The beneficial effects of the further scheme are as follows: through the comparator chip U6, the voltage amplified by the signal processing circuit can be compared with the corresponding reference voltage, so that the main control circuit can control the resistance value of the resistor connected in series with the resistor to be measured in the voltage division circuit according to the voltage output by the comparison circuit, and further the automatic switching of the measuring range is realized.
Further: the measurement circuit of the insulation resistance for the pyroelectric sensor further comprises a display circuit, wherein the signal input end of the display circuit is electrically connected with the signal output end of the main control circuit, and the power supply input end of the display circuit is electrically connected with the output end of the power supply circuit.
The beneficial effects of the further scheme are as follows: the measuring result of the resistance can be conveniently and visually displayed through the display circuit.
Drawings
FIG. 1 is a schematic structural diagram of a measurement circuit of insulation resistance for a pyroelectric sensor according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a power circuit according to an embodiment of the utility model;
FIG. 3 is a circuit diagram of a voltage divider circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a signal processing circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a comparison circuit according to an embodiment of the utility model.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1, a measurement circuit of an insulation resistance for a pyroelectric sensor includes a power supply circuit, a voltage dividing circuit, a signal processing circuit, a main control circuit and a comparison circuit, wherein a resistance to be measured R5 is electrically connected between an output end of the power supply circuit and an input end of the voltage circuit, an output end of the voltage dividing circuit is electrically connected with an input end of the signal processing circuit, an output end of the signal processing circuit is electrically connected with an input end of the comparison circuit, an output end of the comparison circuit is electrically connected with a signal input end of the main controller, and the power supply circuit is respectively electrically connected with the voltage dividing circuit, the signal processing circuit, the main control circuit and the comparison circuit and provides voltage.
According to the measuring circuit of the insulation resistor for the pyroelectric sensor, the voltage of the resistor to be measured and different resistors of corresponding gears are divided through the voltage dividing circuit, then the main control circuit determines the range of the resistor to be measured according to the voltage output by the voltage dividing circuit, meanwhile, the comparison circuit compares the voltage output by the voltage dividing circuit with the preset reference voltage, and therefore the measuring range of the whole circuit is determined, the resistors for the pyroelectric sensor with different resistance values can be measured, and the whole circuit is simple in structure and high in universality.
In one or more embodiments of the present invention, the power circuit includes a first voltage conversion circuit, a second voltage conversion circuit, and an indication circuit, an input terminal of the first voltage conversion circuit and an input terminal of the second voltage conversion circuit are respectively electrically connected to an external power source, an output terminal of the first voltage conversion circuit is respectively electrically connected to a power input terminal of a voltage division circuit and a power input terminal of a signal processing circuit, a resistor to be measured R5 is electrically connected between an output terminal of the first voltage conversion circuit and a signal input terminal of the voltage division circuit, an output terminal of the second voltage conversion circuit is respectively electrically connected to a power input terminal of the main control circuit and a power input terminal of the comparison circuit, and the indication circuit is electrically connected between the external power source and ground. Through first voltage conversion circuit can convert external power source's voltage into 5V, thereby does bleeder circuit and signal processing circuit power supply, through second voltage conversion circuit can convert external power source's voltage into 3.3V, thereby does main control circuit and comparison circuit power supply, through indicating circuit can show external power source's power supply state, and is convenient directly perceived.
In the utility model, the external power supply can use an external 6-15V direct current power supply for power supply and is provided with a voltage stabilizing circuit to ensure the voltage stability of the whole circuit. As shown in fig. 2, in this embodiment, the external power supply uses a 9V dc battery, and controls the on/off of the power supply voltage through a switch S1, the first voltage conversion circuit uses a voltage conversion chip U1 (model number is AMS1117-5) to output VCC5V voltage in cooperation with a peripheral circuit, the second voltage conversion circuit uses a voltage conversion chip U3 (model number is AMS1117-3.3) to output 3.3V voltage in cooperation with a peripheral circuit, and only the circuit uses a resistor R1 and a light emitting diode D1 connected in series.
As shown in fig. 3, in one or more embodiments of the present invention, the voltage dividing circuit includes an analog switch U4, a capacitor C20, a resistor R3, a resistor R4, and a resistor R7, a power input terminal of the analog switch U4 is electrically connected to the output terminal of the first voltage converting circuit, a resistor R5 to be tested is electrically connected between the output terminal of the first voltage converting circuit and the signal input terminal of the analog switch U4, the capacitor C20 is electrically connected between the signal input terminal of the analog switch U4 and ground, a first input terminal X0 of an X channel of the analog switch U4 and a first input terminal Y0 of a Y channel of the Y636 are both grounded through the resistor R7, a second input terminal X1 of the X channel of the analog switch U4 and a second input terminal Y1 of the Y channel are both grounded through the resistor R4, a third input terminal X5 of the X channel of the analog switch U4 and a third input terminal Y2 of the Y channel are both grounded through the resistor R3, the fourth input end X3 of the X channel of the analog switch U4 is electrically connected with the fourth input end Y3 of the Y channel, two address ends A and B of the analog switch U4 are respectively and correspondingly electrically connected with two control signal output ends of the main control circuit, and the output end of the analog switch U4 is electrically connected with the signal input end of the main control circuit. : through analog switch U4, can make resistance R5 that awaits measuring and corresponding resistance series connection partial pressure, then gather the obtained voltage of divider resistance, use analog switch in order to reach the purpose of automatic switch-over range to promote the resistance measuring scope.
As shown in fig. 3, U4 is an analog switch, the model is CD4052BCM, R5 is a position to-be-measured resistor, R3 is a G Ω -level voltage-dividing resistor, R4 is a M Ω -level voltage-dividing resistor, R7 is a K Ω -level voltage-dividing resistor, and the U4 analog switch is controlled by a main control chip to realize the function of automatically switching the range.
As shown in fig. 4, in one or more embodiments of the present invention, the signal processing circuit includes an operational amplifier U5, a resistor R16, a resistor R22, a resistor R6, a resistor R18 and a capacitor C21, one positive signal input terminal of the operational amplifier U5 is electrically connected to the output terminal of the voltage divider circuit, one negative signal input terminal of the operational amplifier U5 is grounded through the resistor R16, one negative signal input terminal and one output terminal of the operational amplifier U5 are electrically connected through the resistor R22, one output terminal of the operational amplifier U5 is electrically connected to the signal input terminal of the main control circuit, the other positive signal input terminal of the operational amplifier U5 is electrically connected to the output terminal of the voltage divider circuit, the other negative signal input terminal of the operational amplifier U5 is grounded through the resistor R18, the one negative signal input terminal and the output terminal of the operational amplifier U5 are electrically connected through the resistor R6, the other output end of the operational amplifier U5 is electrically connected with the input end of the comparison circuit, the power input end of the operational amplifier U5 is electrically connected with the output end of the first power circuit, and the power input end of the operational amplifier U5 is grounded through the capacitor C21. Through the operational amplifier U5, the negative feedback network that cooperation resistance R16 and resistance R22 formed is to the voltage of bleeder circuit output carries out 30 times enlargies, and exports to main control circuit and handles, and operational amplifier U5 cooperation resistance R6 and resistance R18 are to the voltage of bleeder circuit output carries out 30 times of the same multiple enlargies, and main control circuit can judge the voltage size of bleeder circuit output according to the voltage of comparison circuit output like this to make things convenient for main control circuit output control signal, with the measuring range of switching whole circuit. For this reason, the AD8629 chip is used as the operational amplifier U5.
As shown in fig. 5, optionally, in one or more embodiments of the present invention, the comparison circuit employs a comparator chip U6 with model number XD339, and one negative signal input terminal of the comparator chip U6 is electrically connected to the output terminal of the signal processing circuit, one reference voltage terminal of the comparator chip U6 is connected to an external first reference voltage, one signal output terminal of the comparator chip U6 is electrically connected to one control signal input terminal of the main control circuit, the other negative signal input terminal of the comparator chip U6 is electrically connected to the output terminal of the signal processing circuit, the other reference voltage terminal of the comparator chip U6 is connected to an external second reference voltage, the other signal output terminal of the comparator chip U6 is electrically connected to the other control signal input terminal of the main control circuit, the power supply input terminal of the comparator chip U6 is electrically connected to the output terminal of the second voltage conversion circuit, the ground terminal of the comparator chip U6 is grounded. Through the comparator chip U6, the voltage amplified by the signal processing circuit can be compared with the corresponding reference voltage, so that the main control circuit can control the resistance value of the resistor connected in series with the resistor to be measured in the voltage division circuit according to the voltage output by the comparison circuit, and further the automatic switching of the measuring range is realized.
In this embodiment, the initial gear is set to the lowest K Ω gear, the first reference voltage VREF1 is set to 20mv, when one path of signal output terminal SELECT of the voltage comparator U6 outputs a high level, the gear is shifted up to the first gear, when one path of output terminal S SELECT outputs a low level, the current gear is kept unchanged, that is, the current gear is a suitable gear, the second reference voltage VERF2 is set to 50mv, when the other path of signal output terminal SELECT RESET outputs a high level, the gear is reset to the original gear, that is, the lowest gear K Ω gear, and C8 is a filter capacitor.
Optionally, in one or more embodiments of the present invention, the measurement circuit of the insulation resistance for the pyroelectric sensor further includes a display circuit, a signal input terminal of the display circuit is electrically connected to a signal output terminal of the main control circuit, and a power supply input terminal of the display circuit is electrically connected to an output terminal of the power supply circuit. The measuring result of the resistance can be conveniently and visually displayed through the display circuit. Here, the display circuit may be an existing OLED display device.
In this embodiment, the main control circuit adopts an STM32F103 series chip, and acquires the signal processed by the signal processing circuit by using its own ADC, and processes the acquired voltage data, and displays the result on the OLED screen.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A measurement circuit of insulation resistance for a pyroelectric sensor is characterized in that: including power supply circuit, bleeder circuit, signal processing circuit, main control circuit and comparison circuit, the resistance to be measured R5 electricity be connected at power supply circuit's output with between voltage circuit's the input, bleeder circuit's output is connected with signal processing circuit's input electricity, signal processing circuit's output is connected with comparison circuit's input electricity, comparison circuit's output with main control unit's signal input part electricity is connected, power supply circuit respectively with bleeder circuit, signal processing circuit, main control circuit and comparison circuit electricity are connected to provide voltage.
2. The measurement circuit of insulation resistance for pyroelectric sensor according to claim 1, characterized in that: the power supply circuit comprises a first voltage conversion circuit, a second voltage conversion circuit and an indicating circuit, wherein the input end of the first voltage conversion circuit and the input end of the second voltage conversion circuit are respectively electrically connected with an external power supply, the output end of the first voltage conversion circuit is respectively electrically connected with the power input end of a voltage division circuit and the power input end of a signal processing circuit, a resistor R5 to be tested is electrically connected between the output end of the first voltage conversion circuit and the signal input end of the voltage division circuit, the output end of the second voltage conversion circuit is respectively electrically connected with the power input end of a main control circuit and the power input end of a comparison circuit, and the indicating circuit is electrically connected between the external power supply and the ground.
3. The insulation resistance measurement circuit for pyroelectric sensors as recited in claim 2, wherein: the voltage dividing circuit comprises an analog switch U4, a capacitor C20, a resistor R3, a resistor R4 and a resistor R7, a power supply input end of the analog switch U4 is electrically connected with an output end of the first voltage conversion circuit, a resistor R5 to be tested is electrically connected between an output end of the first voltage conversion circuit and a signal input end of the analog switch U4, the capacitor C20 is electrically connected between a signal input end of the analog switch U4 and ground, a first input end X0 of an X channel of the analog switch U4 and a first input end Y0 of a Y channel are both grounded through the resistor R7, a second input end X1 of the X channel of the analog switch U4 and a second input end Y1 of the Y channel are both grounded through the resistor R4, a third input end X2 of the X channel of the analog switch U4 and a third input end Y2 of the Y channel are both grounded through the resistor R3, a fourth input end Y3 of the X3 of the X channel of the analog switch U4 is electrically connected with a fourth input end Y3, two address terminals A and B of the analog switch U4 are respectively and correspondingly electrically connected with two control signal output terminals of the main control circuit, and the output terminal of the analog switch U4 is electrically connected with the signal input terminal of the main control circuit.
4. The insulation resistance measurement circuit for pyroelectric sensors as recited in claim 2, wherein: the signal processing circuit comprises an operational amplifier U5, a resistor R16, a resistor R22, a resistor R6, a resistor R18 and a capacitor C21, wherein one positive signal input end of the operational amplifier U5 is electrically connected with the output end of the voltage division circuit, one negative signal input end of the operational amplifier U5 is grounded through the resistor R16, one negative signal input end of the operational amplifier U5 is electrically connected with one output end through the resistor R22, one output end of the operational amplifier U5 is electrically connected with the signal input end of the main control circuit, the other positive signal input end of the operational amplifier U5 is electrically connected with the output end of the voltage division circuit, the other negative signal input end of the operational amplifier U5 is grounded through the resistor R18, and the other negative signal input end of the operational amplifier U5 is electrically connected with the other output end through the resistor R6, the other output end of the operational amplifier U5 is electrically connected with the input end of the comparison circuit, the power input end of the operational amplifier U5 is electrically connected with the output end of the first power circuit, and the power input end of the operational amplifier U5 is grounded through the capacitor C21.
5. The insulation resistance measurement circuit for pyroelectric sensors as claimed in claim 4, wherein: the comparison circuit adopts a comparator chip U6 with the model number XD339, one negative signal input end of the comparator chip U6 is electrically connected with the output end of the signal processing circuit, one path of reference voltage end of the comparator chip U6 is connected with an external first reference voltage, one path of signal output end of the comparator chip U6 is electrically connected with one control signal input end of the main control circuit, the other negative signal input end of the comparator chip U6 is electrically connected with the output end of the signal processing circuit, the other path of reference voltage end of the comparator chip U6 is connected with an external second reference voltage, the other path of signal output end of the comparator chip U6 is electrically connected with the other control signal input end of the main control circuit, the power supply input end of the comparator chip U6 is electrically connected with the output end of the second voltage conversion circuit, and the grounding end of the comparator chip U6 is grounded.
6. The insulation resistance measuring circuit for pyroelectric sensors as recited in any one of claims 1 to 5, wherein: the display device is characterized by further comprising a display circuit, wherein the signal input end of the display circuit is electrically connected with the signal output end of the main control circuit, and the power input end of the display circuit is electrically connected with the output end of the power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120869508.0U CN215599257U (en) | 2021-04-26 | 2021-04-26 | Measurement circuit of insulation resistance for pyroelectric sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120869508.0U CN215599257U (en) | 2021-04-26 | 2021-04-26 | Measurement circuit of insulation resistance for pyroelectric sensor |
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| Publication Number | Publication Date |
|---|---|
| CN215599257U true CN215599257U (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120869508.0U Active CN215599257U (en) | 2021-04-26 | 2021-04-26 | Measurement circuit of insulation resistance for pyroelectric sensor |
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| Country | Link |
|---|---|
| CN (1) | CN215599257U (en) |
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2021
- 2021-04-26 CN CN202120869508.0U patent/CN215599257U/en active Active
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