CN112379174A - Circuit for detecting resistance and drain voltage of same-line - Google Patents
Circuit for detecting resistance and drain voltage of same-line Download PDFInfo
- Publication number
- CN112379174A CN112379174A CN202011377642.5A CN202011377642A CN112379174A CN 112379174 A CN112379174 A CN 112379174A CN 202011377642 A CN202011377642 A CN 202011377642A CN 112379174 A CN112379174 A CN 112379174A
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- 238000001514 detection method Methods 0.000 claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 description 6
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a detection circuit for the resistance and the drain voltage of a collinear circuit; the circuit comprises a resistance detection circuit and a voltage detection circuit, wherein both the resistance detection circuit and the voltage detection circuit are connected with a leakage voltage signal Vin, the resistance detection circuit inputs high and low levels to a single chip microcomputer according to the size of a circuit resistance, and the voltage detection circuit filters and isolates the leakage voltage signal and then judges the size of the leakage voltage signal. The invention checks the resistance and the voltage in the alternating current power supply circuit through the circuit at any time, and reminds when the resistance and the voltage are unqualified due to the circuit damage, thereby preventing the equipment damage caused by low voltage.
Description
Technical Field
The invention relates to a detection circuit for a collinear circuit resistor and a drain voltage.
Background
The resistance of a power supply line is increased due to the fact that the line is damaged in an alternating current line, circuit voltage loss is caused, the voltage finally received by a load is insufficient, and equipment operation is affected.
Disclosure of Invention
In order to solve the technical problem, the invention provides a detection circuit for the resistance and the drain voltage of a collinear circuit.
The invention is realized by the following technical scheme.
The invention provides a detection circuit for the resistance and the drain voltage of a collinear circuit; the circuit comprises a resistance detection circuit and a voltage detection circuit, wherein both the resistance detection circuit and the voltage detection circuit are connected with a leakage voltage signal Vin, the resistance detection circuit inputs high and low levels to a single chip microcomputer according to the size of a circuit resistance, and the voltage detection circuit filters and isolates the leakage voltage signal and then judges the size of the leakage voltage signal.
The resistance detection circuit comprises a detected resistor R which is connected with two poles of a leakage voltage signal Vin, one end of the detected resistor R is connected with the resistor R7, and the other end of the detected resistor R is grounded; the other end of the resistor R7 is connected to the resistor R4 and the resistor R3, and is grounded through the capacitor C2, the other ends of the resistor R4 and the resistor R3 are connected in parallel to the resistor R1, the other end of the resistor R1 is connected to the supply voltage V1, the resistor R7 is further connected to the positive terminal of the input terminal of the voltage follower U1 7, the power terminal of the voltage follower U1 7 is connected to the supply voltage V7, the negative terminal of the input terminal of the voltage follower U1 7 is connected to the positive terminal of the input terminal of the comparator U1 7, the negative terminal of the input terminal of the voltage follower U1 7 is connected to the positive terminal of the sliding resistor RP 7 and the R7, the other end of the resistor R7 is connected to the input terminal of the optical coupler U7, the other end of the sliding resistor RP 7 is connected to the ground, the output terminal of the optical coupler U1 7 is connected to the power supply voltage coupler V7, the output terminal of the single chip microcomputer 7 is connected to the resistor R7 and the single chip microcomputer 7, the other ends of the resistor R5 and the capacitor C1 are grounded.
The voltage detection circuit comprises a rectifier bridge B1, two poles of an input end of the rectifier bridge B1 are connected with a leakage voltage signal Vin, a polarity capacitor C4 is connected between output ends of a rectifier bridge B1, the anode of the polarity capacitor C4 is connected with a resistor R10, the cathode of the polarity capacitor C is connected with the cathode of an input end of a light couple U3, the resistor R10 is respectively connected with a resistor R9 and a resistor R11, the resistor R9 and a resistor R11 are connected in parallel and then connected with the anode of an input end of the light couple U3, a resistor R3 is further connected between the anode and the cathode of the input end of the light couple U3, a power supply end of the light couple U3 is connected with a power supply V3, an output end of the light couple U3 is connected with the anode of an input end of a comparator U4 RP 3, the cathode of the input end of the comparator U4 RP 3 is respectively connected with the resistor R3 and a sliding resistor R3, the cathode of the comparator U3 is respectively connected with the power supply end of the single chip microcomputer 3 and the comparator C3, the comparator R3 are respectively connected with the ground and the output, the other end of the resistor R12 is connected with a power supply V2, and the other end of the capacitor C3 is grounded.
The power supply V1 is 12V.
The power supply V2 is 3.3V.
The invention has the beneficial effects that: the resistance and the voltage in the alternating current power supply circuit are checked through the circuit at any time, and the warning is given when the resistance and the voltage are unqualified due to the circuit damage, so that the equipment damage caused by the low voltage is prevented.
Drawings
FIG. 1 is a schematic structural view of the present invention;
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A detection circuit for the resistance and drain voltage of the same line; the circuit comprises a resistance detection circuit and a voltage detection circuit, wherein both the resistance detection circuit and the voltage detection circuit are connected with a leakage voltage signal Vin, the resistance detection circuit inputs high and low levels to a single chip microcomputer according to the size of a circuit resistance, and the voltage detection circuit filters and isolates the leakage voltage signal and then judges the size of the leakage voltage signal.
The resistance detection circuit comprises a detected resistor R which is connected with two poles of a leakage voltage signal Vin, one end of the detected resistor R is connected with the resistor R7, and the other end of the detected resistor R is grounded; the other end of the resistor R7 is connected to the resistor R4 and the resistor R3, and is grounded through the capacitor C2, the other ends of the resistor R4 and the resistor R3 are connected in parallel to the resistor R1, the other end of the resistor R1 is connected to the supply voltage V1, the resistor R7 is further connected to the positive terminal of the input terminal of the voltage follower U1 7, the power terminal of the voltage follower U1 7 is connected to the supply voltage V7, the negative terminal of the input terminal of the voltage follower U1 7 is connected to the positive terminal of the input terminal of the comparator U1 7, the negative terminal of the input terminal of the voltage follower U1 7 is connected to the positive terminal of the sliding resistor RP 7 and the R7, the other end of the resistor R7 is connected to the input terminal of the optical coupler U7, the other end of the sliding resistor RP 7 is connected to the ground, the output terminal of the optical coupler U1 7 is connected to the power supply voltage coupler V7, the output terminal of the single chip microcomputer 7 is connected to the resistor R7 and the single chip microcomputer 7, the other ends of the resistor R5 and the capacitor C1 are grounded.
The voltage detection circuit comprises a rectifier bridge B1, two poles of an input end of the rectifier bridge B1 are connected with a leakage voltage signal Vin, a polarity capacitor C4 is connected between output ends of a rectifier bridge B1, the anode of the polarity capacitor C4 is connected with a resistor R10, the cathode of the polarity capacitor C is connected with the cathode of an input end of a light couple U3, the resistor R10 is respectively connected with a resistor R9 and a resistor R11, the resistor R9 and a resistor R11 are connected in parallel and then connected with the anode of an input end of the light couple U3, a resistor R3 is further connected between the anode and the cathode of the input end of the light couple U3, a power supply end of the light couple U3 is connected with a power supply V3, an output end of the light couple U3 is connected with the anode of an input end of a comparator U4 RP 3, the cathode of the input end of the comparator U4 RP 3 is respectively connected with the resistor R3 and a sliding resistor R3, the cathode of the comparator U3 is respectively connected with the power supply end of the single chip microcomputer 3 and the comparator C3, the comparator R3 are respectively connected with the ground and the output, the other end of the resistor R12 is connected with a power supply V2, and the other end of the capacitor C3 is grounded.
The power supply V1 is 12V.
The power supply V2 is 3.3V.
Line resistance measurement
As shown in fig. 1, the circuit is used for measuring the line resistance of the measured resistor R at 50K, the measurement accuracy is ± 5K, the output voltage Vout is collected by the single chip, when the line resistance is greater than 50K, the single chip collects a high level and transmits a signal to the alarm device, otherwise, when the line resistance is less than 50K, Vout outputs a low level and does not alarm with the single chip alarm device.
The circuit one is divided into three parts: sampling, signal conditioning and isolated output
The sampling circuit consists of R7, R4, R3, R1, C2, U1A and a power supply voltage V1, wherein the R1, R3, R7 and a resistor R to be measured form a voltage division circuit, the R4 is a thermistor and mainly has the effects of solving the temperature drift of circuit parameters under high and low temperature environments, a V3 voltage signal changes along with the change of the resistor R to be measured, the U1A is a voltage follower and aims to reduce the influence of the acquisition circuit on the voltage division circuit, the output voltage V4 of the follower is sent to the U1B for comparison, and the capacitor C2 is a safety capacitor and aims to absorb alternating voltages at two ends of the resistor to be measured and reduce the influence on resistance measurement.
The signal conditioning circuit comprises U1B, R8, R2, R5 and an adjustable resistor RP1, wherein U1B is a comparator, R8 and RP1 form a reference voltage V5, the magnitude of the reference voltage can be adjusted through RP1, the value of the reference voltage is set to be a voltage value of V3 when the measured resistor R is 50K, and when the measured resistor R is more than 50K, V4 is more than V5, the output voltage V6 of U1B is at a high level, so that light is driven; the coupler works to output a high level for the singlechip to collect, and the system device gives an alarm for prompt at the moment; when the measured resistor R is smaller than 50K, V4 is smaller than V5, the output voltage V6 of U1B is low level, the optical coupler does not work at the moment, a low level is output to be collected by the single chip microcomputer, and the system device does not give an alarm at the moment;
when the measured resistance is at 45K, the relation between V3 and the measured resistance R is as follows:
when the measured resistance R is 45K according to the formula, V4 is V3 is 11.775V;
when the measured resistance R is 50K, V4-V3-11.887V
When the measured resistance R is 55K, V4-V3-11.997V
When the measured resistor R changes from 45K to 55K, the change value of V4 is 222mv, which is much higher than the turning voltage error value of the comparator, therefore, the system error of the circuit is much smaller than the measuring error of the resistor, and the measured resistor of the circuit can be accurately detected to alarm in the range from 45K to 55K.
The isolation circuit consists of optocouplers U2, R6, C1 and a power supply voltage V2, and aims to physically isolate the singlechip from input signals and reduce interference and influence of the input signals on the singlechip.
The second circuit is used for the leakage voltage of the same line of the measured line resistor, the measurement range of the leakage voltage is 0-260V alternating voltage, when the value of the leakage voltage is larger than 36V, the single chip microcomputer controls the alarm to alarm, the value is smaller than 36V, the system does not alarm, the measurement error range is 36 +/-4V
The circuit consists of a rectifying filter, an isolating circuit and a comparison circuit
The rectification filter circuit consists of B1, C4, R0, R11, R9 and R13, wherein R11, R10 and R13 are voltage dividing circuits, and alternating-current voltage is rectified through B1 and C4,
Va＝1.2Vin
vb is related to Va:
when Vin is 36V, Va equals 43.2V, Vb equals 2.826V;
when Vin is 32V, Va is 38.4V, Vb is 2.512V;
when Vin is 40V, Va is 48V, Vb is 3.140V;
the Vb voltage signal is isolated by an optical coupler U3, and the voltage 1:1 is transmitted to a comparator U4A.
And U4A, R14, R12, R15, C3, adjustable resistance RP2 and supply voltage V2 constitute, R15 and RP2 constitute reference voltage Vd of the comparator, its value can be regulated through RP2, its value sets up the value of Vb when Vin is 36V, when Vc is greater than Vd, Vout2 is a high level output, the one-chip computer gathers the signal at this moment and transmits to the alarm device, the system alarms, when Vc is less than Vd, Vout2 is a low level output to the one-chip computer, the system does not alarm.
When the input leakage voltage changes from 32V to 40V, the change value of Vd is 628mv, which is much higher than the error value of the flip voltage of the comparator, so the system error of the circuit is much smaller than the measurement error of the leakage voltage, and the circuit leakage voltage can be accurately detected to alarm in the range from 32V to 40V.
Claims (5)
1. A detection circuit for the resistance and drain voltage of the same line is characterized in that: the circuit comprises a resistance detection circuit and a voltage detection circuit, wherein both the resistance detection circuit and the voltage detection circuit are connected with a leakage voltage signal Vin, the resistance detection circuit inputs high and low levels to a single chip microcomputer according to the size of a circuit resistance, and the voltage detection circuit filters and isolates the leakage voltage signal and then judges the size of the leakage voltage signal.
2. The in-line resistance and drain voltage detection circuit of claim 1, wherein: the resistance detection circuit comprises a detected resistor R which is connected with two poles of a leakage voltage signal Vin, one end of the detected resistor R is connected with the resistor R7, and the other end of the detected resistor R is grounded; the other end of the resistor R7 is connected to the resistor R4 and the resistor R3, and is grounded through the capacitor C2, the other ends of the resistor R4 and the resistor R3 are connected in parallel to the resistor R1, the other end of the resistor R1 is connected to the supply voltage V1, the resistor R7 is further connected to the positive terminal of the input terminal of the voltage follower U1 7, the power terminal of the voltage follower U1 7 is connected to the supply voltage V7, the negative terminal of the input terminal of the voltage follower U1 7 is connected to the positive terminal of the input terminal of the comparator U1 7, the negative terminal of the input terminal of the voltage follower U1 7 is connected to the positive terminal of the sliding resistor RP 7 and the R7, the other end of the resistor R7 is connected to the input terminal of the optical coupler U7, the other end of the sliding resistor RP 7 is connected to the ground, the output terminal of the optical coupler U1 7 is connected to the power supply voltage coupler V7, the output terminal of the single chip microcomputer 7 is connected to the resistor R7 and the single chip microcomputer 7, the other ends of the resistor R5 and the capacitor C1 are grounded.
3. The in-line resistance and drain voltage detection circuit of claim 1, wherein: the voltage detection circuit comprises a rectifier bridge B1, two poles of an input end of the rectifier bridge B1 are connected with a leakage voltage signal Vin, a polarity capacitor C4 is connected between output ends of a rectifier bridge B1, the anode of the polarity capacitor C4 is connected with a resistor R10, the cathode of the polarity capacitor C is connected with the cathode of an input end of a light couple U3, the resistor R10 is respectively connected with a resistor R9 and a resistor R11, the resistor R9 and a resistor R11 are connected in parallel and then connected with the anode of an input end of the light couple U3, a resistor R3 is further connected between the anode and the cathode of the input end of the light couple U3, a power supply end of the light couple U3 is connected with a power supply V3, an output end of the light couple U3 is connected with the anode of an input end of a comparator U4 RP 3, the cathode of the input end of the comparator U4 RP 3 is respectively connected with the resistor R3 and a sliding resistor R3, the cathode of the comparator U3 is respectively connected with the power supply end of the single chip microcomputer 3 and the comparator C3, the comparator R3 are respectively connected with the ground and the output, the other end of the resistor R12 is connected with a power supply V2, and the other end of the capacitor C3 is grounded.
4. The in-line resistance and drain voltage detection circuit of claim 2, wherein: the power supply V1 is 12V.
5. The in-line resistance and drain voltage detection circuit of claim 2, wherein: the power supply V2 is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011377642.5A CN112379174A (en) | 2020-11-30 | 2020-11-30 | Circuit for detecting resistance and drain voltage of same-line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011377642.5A CN112379174A (en) | 2020-11-30 | 2020-11-30 | Circuit for detecting resistance and drain voltage of same-line |
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| Publication Number | Publication Date |
|---|---|
| CN112379174A true CN112379174A (en) | 2021-02-19 |
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| CN202011377642.5A Pending CN112379174A (en) | 2020-11-30 | 2020-11-30 | Circuit for detecting resistance and drain voltage of same-line |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201219194Y (en) * | 2008-06-18 | 2009-04-08 | 合肥同智科技发展有限公司 | AC creepage protection circuit |
| CN206540973U (en) * | 2017-03-08 | 2017-10-03 | 杭州明特科技有限公司 | Buffer-type power-fail detection circuit |
| CN207471157U (en) * | 2017-11-21 | 2018-06-08 | 贵州航天风华实业有限公司 | A kind of high stability electrically conductive ink LED light |
| CN109212421A (en) * | 2018-09-29 | 2019-01-15 | 欣旺达惠州电动汽车电池有限公司 | A kind of detection method of high voltage battery pack system total voltage and insulation resistance |
| CN110018340A (en) * | 2019-03-15 | 2019-07-16 | 广州小鹏汽车科技有限公司 | A kind of battery voltage sampling circuit, method and battery management system |
| CN209166489U (en) * | 2018-12-28 | 2019-07-26 | 中国石油天然气集团有限公司 | A kind of sensor quick detection circuit and the detection device using it |
| CN210401618U (en) * | 2019-08-15 | 2020-04-24 | 山东凌宝智能科技有限公司 | Circuit for detecting electric leakage through electric leakage voltage |
| CN111404114A (en) * | 2020-04-15 | 2020-07-10 | 宁波奥克斯电气股份有限公司 | Electric leakage detection circuit and method, electric leakage protection circuit and method and air conditioner |
| CN111707967A (en) * | 2020-05-27 | 2020-09-25 | 合肥同智机电控制技术有限公司 | Alternating current leakage voltage detection device |
-
2020
- 2020-11-30 CN CN202011377642.5A patent/CN112379174A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201219194Y (en) * | 2008-06-18 | 2009-04-08 | 合肥同智科技发展有限公司 | AC creepage protection circuit |
| CN206540973U (en) * | 2017-03-08 | 2017-10-03 | 杭州明特科技有限公司 | Buffer-type power-fail detection circuit |
| CN207471157U (en) * | 2017-11-21 | 2018-06-08 | 贵州航天风华实业有限公司 | A kind of high stability electrically conductive ink LED light |
| CN109212421A (en) * | 2018-09-29 | 2019-01-15 | 欣旺达惠州电动汽车电池有限公司 | A kind of detection method of high voltage battery pack system total voltage and insulation resistance |
| CN209166489U (en) * | 2018-12-28 | 2019-07-26 | 中国石油天然气集团有限公司 | A kind of sensor quick detection circuit and the detection device using it |
| CN110018340A (en) * | 2019-03-15 | 2019-07-16 | 广州小鹏汽车科技有限公司 | A kind of battery voltage sampling circuit, method and battery management system |
| CN210401618U (en) * | 2019-08-15 | 2020-04-24 | 山东凌宝智能科技有限公司 | Circuit for detecting electric leakage through electric leakage voltage |
| CN111404114A (en) * | 2020-04-15 | 2020-07-10 | 宁波奥克斯电气股份有限公司 | Electric leakage detection circuit and method, electric leakage protection circuit and method and air conditioner |
| CN111707967A (en) * | 2020-05-27 | 2020-09-25 | 合肥同智机电控制技术有限公司 | Alternating current leakage voltage detection device |
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