CN113267669A - Voltage measuring device and method - Google Patents
Voltage measuring device and method Download PDFInfo
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- CN113267669A CN113267669A CN202110629214.5A CN202110629214A CN113267669A CN 113267669 A CN113267669 A CN 113267669A CN 202110629214 A CN202110629214 A CN 202110629214A CN 113267669 A CN113267669 A CN 113267669A
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- 238000000034 method Methods 0.000 title claims description 8
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 238000002955 isolation Methods 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 230000005669 field effect Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims 10
- 238000010168 coupling process Methods 0.000 claims 10
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- 230000005540 biological transmission Effects 0.000 abstract description 8
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008054 signal transmission Effects 0.000 description 1
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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
- G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
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Abstract
The device comprises a voltage sampling module, a power supply conversion module, a VREF reference voltage module, a control module and a TTL communication isolation module, wherein the input ends of the voltage sampling module and the power supply conversion module are connected with a voltage to be measured, the output end of the voltage sampling module is connected with the control module, the output end of the power supply conversion module is respectively connected with the VREF reference voltage module and the control module, the output end of the VREF reference voltage module is connected with the voltage sampling module, and the output end of the control module is connected with the TTL communication isolation module. The utility model provides a voltage measurement device gets the electricity through voltage sampling module lug connection awaiting measuring voltage, carries out signal isolation back transmission after calculating through control module, has both guaranteed that voltage measurement device volume is less, reduces shared space, guarantees voltage measurement's precision simultaneously, and the problem of common mode interference has been solved in signal isolation back transmission, further improves voltage measurement's precision.
Description
Technical Field
The present disclosure relates to the field of voltage measurement technologies, and in particular, to a voltage measurement apparatus and method.
Background
The voltage measurement method in the market is common in two types, the first type adopts a voltage transformer for isolation, and then serially connects resistors to generate sampling signals, and the voltage measurement method is characterized in that although voltage isolation can be realized, the general transformer occupies a large space on measurement equipment due to large volume; the other type is directly connected with a plurality of resistors for voltage division to generate sampling signals, and is characterized in that the occupied space of the measuring equipment is small, but the signals cannot be isolated, and the measuring precision cannot be guaranteed.
Disclosure of Invention
It is an object of the present disclosure to provide a voltage measurement device and method that may solve one or more of the above-mentioned prior art problems.
According to an aspect of the present disclosure, a voltage measurement device is provided, including a voltage sampling module, a power conversion module, a VREF reference voltage module, a control module and a TTL communication isolation module, wherein the input ends of the voltage sampling module and the power conversion module are connected to a voltage to be measured, the output end of the voltage sampling module is connected to the control module, the output end of the power conversion module is connected to the VREF reference voltage module and the control module respectively, the output end of the VREF reference voltage module is connected to the voltage sampling module, and the output end of the control module is connected to the TTL communication isolation module.
In some embodiments, the voltage sampling module includes three sets of series resistors, one end of each of the three sets of series resistors is connected to the a phase, the B phase, and the C phase of the voltage to be measured, and the other end is connected to the control module as three output ends.
In some embodiments, each set of series resistors includes 5 resistors.
In some embodiments, the power conversion module includes a half-wave rectification circuit, a fet Q1, and a chip U4 with model LR7533, the half-wave rectification circuit includes a diode D1, a diode D2, and a diode D3, anodes of a diode D1, a diode D2, and a diode D3 are respectively connected to phase a, phase B, and phase C of the voltage to be measured, cathodes of a diode D1, a diode D2, and a diode D3 are connected together and then connected to an anode of a diode D4, a cathode of the diode D4 is connected to a drain of the fet Q1 through a resistor R5, a gate of the fet Q1 is connected to a cathode of a zener diode Q1, an anode of the zener diode 1 is grounded, a gate of the fet Q1 is connected to cathodes of the diodes D1, D2, and the diode D3 through a resistor R1, a resistor R2, a resistor R3, and a resistor R4 connected in series, a source of the fet Q1 is connected to an input terminal ZD 4 of the chip U4, the output end of the chip U4 is connected to the VREF reference voltage module 3 and the control module 4, respectively.
IN some embodiments, the VREF reference voltage module includes a chip U2 of model LMV321, a power input terminal of the chip U2 is connected to an output terminal of the chip U4, an output terminal of the chip U2 is connected to an output terminal of the voltage sampling module, and an output terminal of the chip U2 is connected to an IN-pin of the chip U2 through a resistor R31.
In some embodiments, the control module includes a chip U3 with a model number HC32F005, a power input terminal of the chip U3 is connected to an output terminal of the chip U4, three output terminals of the voltage sampling module are respectively connected to a pin P01, a pin P24 and a pin P34 of the chip U4, the pin P35 of the chip U3 is connected as a signal output terminal to an input terminal of the TTL communication isolation module, and the pin P36 of the chip U3 is connected as a signal receiving terminal to an output terminal of the TTL communication isolation module.
In some embodiments, the TTL communication isolation module includes a photocoupler U1 and a photocoupler U5 both of which are EL357 type, pin 1 of the photocoupler U1 is connected to the output terminal of the chip U4, pin 2 of the photocoupler U1 is connected to pin P35 of the chip U3, pin 3 of the photocoupler U1 is connected to pin 1 of the photocoupler U5 through a resistor R33, pin 4 of the photocoupler U1 is connected to pin 2 of the photocoupler U5, pin 3 of the photocoupler U5 is grounded, and pin 4 of the photocoupler U5 is connected to pin P36 of the chip U3 and the output terminal of the chip U4.
According to another aspect of the present disclosure, a voltage measurement method is provided, which includes the following steps that a voltage sampling module samples a voltage to be measured and sends the voltage to a control module, a power conversion module converts the voltage to be measured into a direct current to supply power to a VREF reference voltage module and the control module, and a TTL communication isolation module isolates an output signal of the control module.
According to the voltage measuring device and the voltage measuring method, the voltage sampling module is directly connected with the voltage to be measured to obtain electricity, the control module is used for carrying out operation and then carrying out signal isolation and transmission, the size of the voltage measuring device is small, occupied space is reduced, voltage measuring precision is guaranteed, the problem of common-mode interference is solved through signal isolation and transmission, and voltage measuring precision is further improved.
In addition, in the technical solutions of the present disclosure, the technical solutions can be implemented by adopting conventional means in the art, unless otherwise specified.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a voltage measurement apparatus according to an embodiment of the present disclosure.
Fig. 2 is a circuit diagram of a voltage sampling module and a power conversion module in a voltage measurement apparatus according to an embodiment of the present disclosure.
Fig. 3 is a circuit diagram of a VREF reference voltage module in a voltage measurement device according to an embodiment of the present disclosure.
Fig. 4 is a circuit diagram of a control module and a TTL communication isolation module in a voltage measurement apparatus according to an embodiment of the present disclosure.
Fig. 5 is a flowchart of a voltage measurement method according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example 1:
in this embodiment, referring to fig. 1-4 of the specification, a voltage measurement device is provided, which includes a voltage sampling module 1, a power conversion module 2, a VREF reference voltage module 3, a control module 4 and a TTL communication isolation module 5, wherein the input terminals of the voltage sampling module 1 and the power conversion module 2 are both connected to a voltage to be measured, the output terminal of the voltage sampling module 1 is connected to the control module 4, the output terminal of the power conversion module 2 is connected to the VREF reference voltage module 3 and the control module 4, the output terminal of the VREF reference voltage module 3 is connected to the voltage sampling module 1, and the output terminal of the control module 4 is connected to the TTL communication isolation module 5.
In an optional embodiment, the voltage sampling module 1 includes three sets of series resistors, one end of each of the three sets of series resistors is connected to the a phase, the B phase, and the C phase of the voltage to be measured, and the other end is connected to the control module 4 as three output ends. Therefore, the voltage signals collected by the series-connected voltage dividing resistors are sent to the control module for operation, and the measurement precision is improved.
In an optional embodiment, the series resistors may be high-precision resistors, so as to further improve the precision of voltage measurement.
In an alternative embodiment, each set of series resistors comprises 5 resistors.
In an alternative embodiment, the power conversion module 2 includes a half-wave rectification circuit, a fet Q1 and a chip U4 with model number LR7533, the half-wave rectification circuit includes a diode D1, a diode D2 and a diode D3, anodes of the diodes D1, D2 and D3 are respectively connected to the phase a, the phase B and the phase C of the voltage to be measured, cathodes of the diodes D1, D2 and D3 are connected together and then connected to an anode of the diode D4, a cathode of the diode D4 is connected to a drain of the fet Q1 through a resistor R5, a gate of the fet Q1 is connected to a cathode of the zener diode ZD1, an anode of the zener diode 1 is grounded, a gate of the fet Q1 is connected to cathodes of the diodes D1, the diodes D1 and the diode D1 through a resistor R1, a resistor R1 and a resistor R1 connected in series, a source of the fet ZD1 is connected to an input terminal of the chip U4, the output end of the chip U4 is connected to the VREF reference voltage module 3 and the control module 4, respectively. Therefore, the voltage of the voltage to be measured after passing through the rectifier diode is supplied to the grid of the field effect transistor after passing through the current limiting resistors R1-R4, and is used for supplying power to the control module 4 after passing through the field effect transistor and the voltage stabilizing chip U4.
IN an alternative embodiment, the VREF reference voltage module 3 includes a chip U2 with model LMV321, a power input terminal of the chip U2 is connected to an output terminal of the chip U4, an output terminal of the chip U2 is connected to an output terminal of the voltage sampling module 1, and an output terminal of the chip U2 is connected to an IN-pin of the chip U2 through a resistor R31. In an alternative embodiment, the chip U2 may provide a bias voltage of 1.65V. Thus, the chip U2 provides a bias voltage, which makes the voltage signal positive and can be input to the control module.
In an alternative embodiment, the control module 4 includes a chip U3 with a model number HC32F005, a power input terminal of the chip U3 is connected to an output terminal of the chip U4, three output terminals of the voltage sampling module 1 are respectively connected to a pin P01, a pin P24 and a pin P34 of the chip U4, the pin P35 of the chip U3 is used as a signal output terminal to be connected to an input terminal of the TTL communication isolation module 5, and the pin P36 of the chip U3 is used as a signal receiving terminal to be connected to an output terminal of the TTL communication isolation module 5.
In an alternative embodiment, the TTL communication isolation module 5 includes a photocoupler U1 and a photocoupler U5 both having the model number EL357, pin 1 of the photocoupler U1 is connected to the output terminal of the chip U4, pin 2 of the photocoupler U1 is connected to pin P35 of the chip U3, pin 3 of the photocoupler U1 is connected to pin 1 of the photocoupler U5 through a resistor R33, pin 4 of the photocoupler U1 is connected to pin 2 of the photocoupler U5, pin 3 of the photocoupler U5 is grounded, and pin 4 of the photocoupler U5 is connected to pin P36 of the chip U3 and the output terminal of the chip U4. Therefore, the TTL level signals to be transmitted are isolated and then transmitted, the problem of common mode interference is solved, signal transmission distortion is small, the isolation effect is good, measurement and communication are isolated, and signal reliability is improved.
The utility model provides a voltage measurement device gets the electricity through voltage sampling module lug connection awaiting measuring voltage, carries out signal isolation back transmission after calculating through control module, has both guaranteed that voltage measurement device volume is less, reduces shared space, guarantees voltage measurement's precision simultaneously, and the problem of common mode interference has been solved in signal isolation back transmission, further improves voltage measurement's precision.
Example 2:
in this embodiment, referring to fig. 5 of the specification, there is provided a voltage measuring method applied to the voltage measuring device in any one of the product embodiments, including the following steps:
s101: the voltage sampling module samples the voltage to be detected and sends the voltage to the control module;
s102: the power supply conversion module converts the voltage to be measured into direct current to supply power for the VREF reference voltage module and the control module;
s103: and the TTL communication isolation module isolates the output signal of the control module.
According to the voltage measuring method, the voltage sampling module is directly connected with the voltage to be measured to obtain electricity, the control module is used for carrying out operation and then carrying out signal isolation and transmission, the size of the voltage measuring device is small, occupied space is reduced, voltage measuring precision is guaranteed, the problem of common mode interference is solved by signal isolation and transmission, and the voltage measuring precision is further improved.
The foregoing is merely an alternative embodiment of the present disclosure, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present disclosure, and these should also be considered as the protection scope of the present disclosure.
Claims (8)
1. The voltage measuring device is characterized by comprising a voltage sampling module (1), a power supply conversion module (2), a VREF reference voltage module (3), a control module (4) and a TTL communication isolation module (5),
the input ends of the voltage sampling module (1) and the power supply conversion module (2) are connected with a voltage to be measured,
the output end of the voltage sampling module (1) is connected with the control module (4),
the output end of the power supply conversion module (2) is respectively connected with the VREF reference voltage module (3) and the control module (4),
the output end of the VREF reference voltage module (3) is connected with the voltage sampling module (1),
and the output end of the control module (4) is connected with the TTL communication isolation module (5).
2. The voltage measurement device according to claim 1, wherein the voltage sampling module (1) comprises three sets of series resistors, one end of each set of series resistors is connected to the phase a, the phase B and the phase C of the voltage to be measured, and the other end is connected to the control module (4) as three output ends.
3. Voltage measurement device according to claim 2, characterized in that each set of said series resistances comprises 5 resistances.
4. Voltage measurement device according to claim 3, characterized in that said power conversion module (2) comprises a half-wave rectifier circuit, a field effect transistor Q1 and a chip U4 of model LR7533,
the half-wave rectifying circuit comprises a diode D1, a diode D2 and a diode D3, the anodes of the diode D1, the diode D2 and the diode D3 are respectively connected with the phase A, the phase B and the phase C of the voltage to be measured, the diode D1, the diode D2 and the diode D3 are connected together and then connected with the anode of the diode D4, the cathode of the diode D4 is connected with the drain of the field effect transistor Q1 through a resistor R5, the gate of the field effect transistor Q1 is connected with the cathode of the zener diode ZD1, the anode of the zener diode ZD1 is grounded, the gate of the field effect transistor Q1 is connected with the cathodes of the diode D1, the diode D2 and the diode D3 through a resistor R1, a resistor R2, a resistor R3 and a resistor R4 which are connected in series, the source of the field effect transistor Q1 is connected with the input end of the chip U4, and the output end of the chip U4 is respectively connected with the VREF reference voltage module 3 and the control module 4.
5. The voltage measurement device according to claim 4, characterized IN that the VREF reference voltage module (3) comprises a chip U2 with model LMV321, the power supply input of the chip U2 is connected with the output of the chip U4, the output of the chip U2 is connected with the output of the voltage sampling module (1), and the output of the chip U2 is connected with the IN-pin of the chip U2 through a resistor R31.
6. The voltage measurement device according to claim 5, wherein the control module (4) comprises a chip U3 with model HC32F005, a power input terminal of the chip U3 is connected to an output terminal of the chip U4, three output terminals of the voltage sampling module (1) are respectively connected to a pin P01, a pin P24 and a pin P34 of the chip U4, the pin P35 of the chip U3 is connected as a signal output terminal to an input terminal of the TTL communication isolation module (5), and the pin P36 of the chip U3 is connected as a signal receiving terminal to an output terminal of the TTL communication isolation module (5).
7. The voltage measuring device of claim 6, wherein the TTL communication isolation module (5) comprises a photoelectric coupling element U1 and a photoelectric coupling element U5, both of which are EL357 type, pin 1 of the photoelectric coupling element U1 is connected to the output terminal of a chip U4, pin 2 of the photoelectric coupling element U1 is connected to pin P35 of the chip U3, pin 3 of the photoelectric coupling element U1 is connected to pin 1 of the photoelectric coupling element U5 through a resistor R33, pin 4 of the photoelectric coupling element U1 is connected to pin 2 of the photoelectric coupling element U5, pin 3 of the photoelectric coupling element U5 is grounded, and pin 4 of the photoelectric coupling element U5 is connected to pin P36 of the chip U3 and the output terminal of the chip U4.
8. A voltage measuring method applied to the voltage measuring apparatus according to any one of claims 1 to 7, comprising the steps of,
the voltage sampling module samples the voltage to be measured and sends the voltage to the control module,
the power supply conversion module converts the voltage to be measured into direct current to supply power for the VREF reference voltage module and the control module,
and the TTL communication isolation module isolates the output signal of the control module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110629214.5A CN113267669A (en) | 2021-06-04 | 2021-06-04 | Voltage measuring device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110629214.5A CN113267669A (en) | 2021-06-04 | 2021-06-04 | Voltage measuring device and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120153934A1 (en) * | 2010-12-16 | 2012-06-21 | Hubei Shengjia Electric Apparatus Co., Ltd. | Voltage and current sampling device |
| CN204882702U (en) * | 2015-07-24 | 2015-12-16 | 厦门炬研电子科技有限公司 | Alternating current power supply sampling circuit |
| CN108306254A (en) * | 2018-04-09 | 2018-07-20 | 广州金升阳科技有限公司 | A kind of isolation protective circuit and the Switching Power Supply comprising the circuit |
| CN207691759U (en) * | 2018-01-03 | 2018-08-03 | 深圳市华杰电气技术有限公司 | A kind of tension measuring circuit |
| CN217060337U (en) * | 2021-06-04 | 2022-07-26 | 上海冉能自动化科技有限公司 | Voltage measuring device |
-
2021
- 2021-06-04 CN CN202110629214.5A patent/CN113267669A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120153934A1 (en) * | 2010-12-16 | 2012-06-21 | Hubei Shengjia Electric Apparatus Co., Ltd. | Voltage and current sampling device |
| CN204882702U (en) * | 2015-07-24 | 2015-12-16 | 厦门炬研电子科技有限公司 | Alternating current power supply sampling circuit |
| CN207691759U (en) * | 2018-01-03 | 2018-08-03 | 深圳市华杰电气技术有限公司 | A kind of tension measuring circuit |
| CN108306254A (en) * | 2018-04-09 | 2018-07-20 | 广州金升阳科技有限公司 | A kind of isolation protective circuit and the Switching Power Supply comprising the circuit |
| CN217060337U (en) * | 2021-06-04 | 2022-07-26 | 上海冉能自动化科技有限公司 | Voltage measuring device |
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