CN218601357U - Ammeter test isolating device - Google Patents
Ammeter test isolating device Download PDFInfo
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- CN218601357U CN218601357U CN202222357233.XU CN202222357233U CN218601357U CN 218601357 U CN218601357 U CN 218601357U CN 202222357233 U CN202222357233 U CN 202222357233U CN 218601357 U CN218601357 U CN 218601357U
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Abstract
The utility model provides an ammeter test isolating device, isolating device includes: the device comprises a protection module, an amplification module and an isolation module; the input end of the protection module is used for connecting an analog signal positive input end when in use, and the output end of the protection module is connected with the input end of the amplification module; the isolation module comprises a feedback unit, an optical coupler and a conversion unit, wherein the input end of the feedback unit is connected with the output end of the amplification module and used for stabilizing signals and linearizing the signals, the output end of the feedback unit is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the conversion unit, and the output end of the conversion unit is used for outputting stabilized voltage. The utility model discloses an isolation module has reduced the influence of on-the-spot signal line and ground wire interference to the test, has ensured the safety of system, and optical coupler makes the interfering signal on the measured signal attenuated greatly, has ensured the measuring degree of accuracy.
Description
Technical Field
The utility model relates to an ammeter test technical field especially relates to an ammeter test isolating device.
Background
In the FCT test process of the electric meter, the voltage of each voltage point needs to be tested under the condition of alternating current, because the electric meter is mainly provided with two groups of GND (ground) of a live wire and a zero line and is not provided with isolated power supply, voltage signals need to be processed in a common ground mode in the test process, if two groups of ground are easily short-circuited in the measurement of an electric meter product, the overvoltage of a bad product is caused in the test process, and meanwhile, in the test process, some electromagnetic interference signals enter a measurement system and the measurement accuracy is easily reduced.
SUMMERY OF THE UTILITY MODEL
Not enough to exist among the prior art, the utility model provides an ammeter test isolating device to there is the technical problem of excessive pressure in ammeter test among the solution correlation technique because electromagnetic interference signal gets into measurement system and leads to measuring accuracy to reduce and the test procedure.
The utility model provides an ammeter test isolating device, isolating device includes:
the device comprises a protection module, an amplification module and an isolation module;
the input end of the protection module is used for connecting an analog signal positive input end when in use, and the output end of the protection module is connected with the input end of the amplification module;
the isolation module comprises a feedback unit, an optical coupler and a conversion unit, wherein the input end of the feedback unit is connected with the output end of the amplification module and used for stabilizing signals and linearizing the signals, the output end of the feedback unit is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the conversion unit, and the output end of the conversion unit is used for outputting stabilized voltage.
Optionally, the protection module comprises:
one end of the first resistor is connected with the positive input end of the analog signal, and the other end of the first resistor is connected with the input end of the amplifying module;
the cathode of the first diode is connected with the positive end of a power supply, and the anode of the first diode is connected with the other end of the first resistor;
the cathode of the second diode is connected with the other end of the first resistor, and the anode of the second diode is connected with the negative end of power supply;
and the anode of the polar capacitor is connected with the other end of the first resistor, and the cathode of the polar capacitor is connected with the anode of the second diode.
Optionally, the amplifying module comprises:
one end of the second resistor is connected with the other end of the first resistor;
the inverting input end of the first amplifier is connected with the other end of the second resistor, the non-inverting input end of the first amplifier is connected with the output end of the first amplifier, and the output end of the first amplifier is connected with the input end of the isolation module.
Optionally, the feedback unit includes:
the positive input end of the second amplifier is connected with the output end of the first amplifier;
one end of the third resistor is connected with the analog signal negative input end, the other end of the third resistor is connected with the reverse input end of the second amplifier, and the other end of the third resistor is also connected with the first feedback end of the optical coupler;
one end of the fourth resistor is connected with the output end of the second amplifier, and the other end of the fourth resistor is connected with the input end of the optical coupler;
a first end of the fifth resistor is connected with the output end of the second amplifier, and the other end of the fifth resistor is connected with a second feedback end of the optical coupler;
and the first capacitor is connected in parallel with two ends of the fifth resistor.
Optionally, the conversion unit includes:
a third amplifier, wherein an inverting input terminal of the third amplifier is connected to the first output terminal of the coupler, and a non-inverting input terminal of the third amplifier is connected to the second output terminal of the coupler;
one end of the second capacitor is connected with the non-inverting input end of the third amplifier, and the other end of the second capacitor is grounded;
one end of the sixth resistor is connected with the non-inverting input end of the third amplifier, and the other end of the sixth resistor is grounded;
one end of the third capacitor is connected with the output end of the third amplifier, and the other end of the third capacitor is connected with the reverse input end of the third amplifier;
and one end of the seventh resistor is connected with the inverting input end of the third amplifier, and the other end of the seventh resistor is connected with the output end of the third amplifier.
Optionally, the conversion unit further comprises:
and one end of the potentiometer is connected with the other end of the sixth resistor, and the other end of the potentiometer is connected with the output end of the third amplifier.
Optionally, the optical coupler is of type HCNR201.
Optionally, the optical coupler comprises an LED, a first photodiode and a second photodiode highly matched thereto.
Optionally, the anode of the LED is connected to the positive power supply terminal, and the cathode thereof is connected to the other end of the fourth resistor.
Optionally, an anode of the first photodiode is connected to the other end of the third resistor, and a cathode thereof is connected to the other end of the fifth resistor; the cathode of the second photodiode is connected to the inverting input of the third amplifier, and the anode thereof is connected to the non-inverting input of the third amplifier.
The technical principle of the utility model is that:
the overvoltage protection of the analog signal input end is realized through the protection module, then the analog input signal is amplified through the amplification module, and then signal transmission is carried out by taking light as a medium through the mutual conversion between photoelectricity in the isolation module, so that the measurement device is completely isolated from a field signal electrically.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. overvoltage protection is achieved for the analog signal input end through the protection module, and the overvoltage condition is prevented.
2. The influence of field signal line and ground wire interference on the test is reduced through the isolation module, the safety of the system is ensured, the interference signal on the measurement signal is greatly attenuated by the optical coupler, and the measurement accuracy is ensured.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is an overall circuit diagram of the present invention.
The reference numbers illustrate:
100. a protection module; 110. an amplifying module; 120. an isolation module; 121. a feedback unit; 122. an optical coupler; 123. and a conversion unit.
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly understood, the following technical solutions of the present invention are further described with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, the utility model provides an ammeter test isolating device, isolating device includes:
a protection module 100, an amplification module 110 and an isolation module 120;
the input end of the protection module 100 is used to connect to a positive input end of an analog signal, and the output end of the protection module 100 is connected to the input end of the amplification module 110;
the isolation module 120 includes a feedback unit 121, an optical coupler 122, and a conversion unit 123, where an input end of the feedback unit 121 is connected to an output end of the amplification module 110, and is used to stabilize and linearize a signal, an output end of the feedback unit 121 is connected to an input end of the optical coupler 122, an output end of the optical coupler 122 is connected to an input end of the conversion unit 123, and an output end of the conversion unit 123 is used to output a stable voltage.
In this embodiment, overvoltage protection of the analog signal input end is realized through the protection module 100, then the analog input signal is amplified through the amplification module 110, and then signal transmission is performed by using light as a medium through interconversion between photoelectricity in the isolation module 120, so that the measurement device and a field signal are completely isolated electrically.
The utility model discloses both realized overvoltage protection promptly through protection module 100, reduced on-the-spot signal line and ground wire interference again through isolation module 120 and to the influence of test, ensured the safety of system, optical coupler 122 makes the interference signal on the measuring signal greatly attenuate, has ensured the measuring degree of accuracy.
Referring to fig. 2, optionally, the protection module 100 includes:
one end of the first resistor R1 is connected to the positive input end of the analog signal, and the other end of the first resistor R1 is connected to the input end of the amplifying module 110;
the cathode of the first diode D1 is connected with the positive end of a power supply, and the anode of the first diode D1 is connected with the other end of the first resistor R1;
a cathode of the second diode D2 is connected with the other end of the first resistor R1, and an anode of the second diode D2 is connected with a power supply negative terminal;
and the anode of the polar capacitor C1 is connected with the other end of the first resistor R1, and the cathode of the polar capacitor C1 is connected with the anode of the second diode D2.
In this embodiment, the first resistor R1 is used for current limiting, the first diode D1 and the second diode D2 form a clamp protection circuit, and the forward conduction voltage drop is controlled to be 0.5-0.7V or less, so as to protect the circuit, and the active capacitor C1 is used for filtering in the circuit.
Referring to fig. 2, optionally, the amplification module 110 includes:
one end of the second resistor R2 is connected with the other end of the first resistor R1;
the inverting input end of the first amplifier U1 is connected to the other end of the second resistor R2, the non-inverting input end of the first amplifier U1 is connected to the output end of the first amplifier U1, and the output end of the first amplifier U1 is connected to the input end of the isolation module 120.
In this embodiment, the second resistor R2 is used as an input resistor of the first amplifier U1, and the first amplifier U1 is used to enhance amplification of the input signal.
Referring to fig. 2, optionally, the feedback unit 121 includes:
the positive input end of the second amplifier U2 is connected with the output end of the first amplifier U1;
one end of the third resistor R3 is connected to the negative input end of the analog signal, the other end of the third resistor R3 is connected to the inverting input end of the second amplifier U2, and the other end of the third resistor R3 is further connected to the first feedback end of the optical coupler 122;
one end of the fourth resistor R4 is connected to the output end of the second amplifier U2, and the other end of the fourth resistor R4 is connected to the input end of the optical coupler 122;
a fifth resistor R5, a first end of the fifth resistor R5 is connected to the output end of the second amplifier U2, and the other end thereof is connected to the second feedback end of the optical coupler 122;
and the first capacitor C2, the first capacitor C2 is connected in parallel to two ends of the fifth resistor R5.
In this embodiment, the feedback unit 121 forms a negative feedback amplifying circuit, and is mainly used for stabilizing and linearizing the light output of the LED in the optical coupler 122, and simultaneously improving the stability of the amplifying circuit, reducing the gain, and suppressing noise interference, where the first capacitor C2 is used to improve the high-frequency characteristic of the circuit, the fourth resistor R4 is a current-limiting resistor at the input end of the optical coupler 122, and the control of the resistances of the fifth resistor R5 and the third resistor R3 can be used to adjust the gain of the second amplifier U2.
Referring to fig. 2, optionally, the conversion unit 123 includes:
a reverse input end of the third amplifier U3 is connected to the first output end of the coupler, and a non-inverting input end of the third amplifier U3 is connected to the second output end of the coupler;
one end of the second capacitor C3 is connected with the non-inverting input end of the third amplifier U3, and the other end of the second capacitor C3 is grounded;
one end of the sixth resistor R6 is connected with the non-inverting input end of the third amplifier U3, and the other end of the sixth resistor R6 is grounded;
one end of the third capacitor C4 is connected with the output end of the third amplifier U3, and the other end of the third capacitor C4 is connected with the inverting input end of the third amplifier U3;
and one end of the seventh resistor R7 is connected to the inverting input terminal of the third amplifier U3, and the other end of the seventh resistor R7 is connected to the output terminal of the third amplifier U3.
In this embodiment, the converting unit 123 constitutes a current-voltage converting circuit, and the second capacitor C3 and the third capacitor C4 are both used for improving high-frequency characteristics in the circuit. The resistance of the seventh resistor R7 is controlled to adjust the gain of the third amplifier U3, and the sixth resistor R6 is used for voltage division.
Referring to fig. 2, optionally, the conversion unit 123 further includes:
and one end of the potentiometer W1 is connected with the other end of the sixth resistor R6, and the other end of the potentiometer W1 is connected with the output end of the third amplifier U3.
In this embodiment, the potentiometer W1 is a sliding potentiometer W1, which can be used to manually adjust the voltage and the current so as to control the output gain of the third amplifier U3.
Referring to fig. 2, optionally, the optocoupler 122 is of the type HCNR201.
In this embodiment, the NCNR201 can be used to provide analog signal isolation that requires good stability, high linearity, and stable gain.
Referring to fig. 2, optionally, the optical coupler 122 includes an LED, a first photodiode, and a second photodiode that is height-matched thereto.
In this embodiment, since the first photodiode can be used to monitor and stabilize the photometric output of the LED, the non-linearity and drift characteristics of the LED are eliminated, and the second photodiode generates a photocurrent linearly corresponding to the optical output of the LED, so as to ensure high linearity and stable gain of the optical coupler 122.
Referring to fig. 2, optionally, the anode of the LED is connected to the positive power supply terminal, and the cathode thereof is connected to the other end of the fourth resistor R4.
In this embodiment, an anode of the LED (pin 2 of the optical coupler 122) is connected to a positive power supply terminal, and a cathode of the LED (pin 1 of the optical coupler 122) is connected to the other end of the fourth resistor R4.
Referring to fig. 2, optionally, the anode of the first photodiode is connected to the other end of the third resistor R3, and the cathode thereof is connected to the other end of the fifth resistor R5; the cathode of the second photodiode is connected to the inverting input of the third amplifier U3, and the anode thereof is connected to the non-inverting input of the third amplifier U3.
In this embodiment, an anode of the first photodiode (pin 4 of the optical coupler 122) is connected to the other end of the third resistor R3, and a cathode thereof (pin 3 of the optical coupler 122) is connected to the other end of the fifth resistor R5; the cathode of the second photodiode (pin 6 of the optocoupler 122) is connected to the inverting input of the third amplifier U3 and the anode thereof (pin 5 of the optocoupler 122) is connected to the non-inverting input of the third amplifier U3.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An electricity meter test isolation device, the isolation device comprising:
the device comprises a protection module, an amplification module and an isolation module;
the input end of the protection module is used for connecting an analog signal positive input end when in use, and the output end of the protection module is connected with the input end of the amplification module;
the isolation module comprises a feedback unit, an optical coupler and a conversion unit, wherein the input end of the feedback unit is connected with the output end of the amplification module and used for stabilizing signals and linearizing the signals, the output end of the feedback unit is connected with the input end of the optical coupler, the output end of the optical coupler is connected with the input end of the conversion unit, and the output end of the conversion unit is used for outputting stabilized voltage.
2. An electricity meter test isolation assembly as defined in claim 1, wherein said protection module comprises:
one end of the first resistor is connected with the positive input end of the analog signal, and the other end of the first resistor is connected with the input end of the amplifying module;
the cathode of the first diode is connected with the positive end of a power supply, and the anode of the first diode is connected with the other end of the first resistor;
the cathode of the second diode is connected with the other end of the first resistor, and the anode of the second diode is connected with the negative end of power supply;
and the anode of the polar capacitor is connected with the other end of the first resistor, and the cathode of the polar capacitor is connected with the anode of the second diode.
3. An electricity meter test isolation assembly as recited in claim 2, wherein said amplification module comprises:
one end of the second resistor is connected with the other end of the first resistor;
and the reverse input end of the first amplifier is connected with the other end of the second resistor, the non-inverting input end of the first amplifier is connected with the output end of the first amplifier, and the output end of the first amplifier is connected with the input end of the isolation module.
4. A meter test isolation assembly as in claim 3, wherein said feedback unit comprises:
the positive input end of the second amplifier is connected with the output end of the first amplifier;
one end of the third resistor is connected with the analog signal negative input end, the other end of the third resistor is connected with the reverse input end of the second amplifier, and the other end of the third resistor is also connected with the first feedback end of the optical coupler;
one end of the fourth resistor is connected with the output end of the second amplifier, and the other end of the fourth resistor is connected with the input end of the optical coupler;
a first end of the fifth resistor is connected with the output end of the second amplifier, and the other end of the fifth resistor is connected with a second feedback end of the optical coupler;
and the first capacitor is connected in parallel with two ends of the fifth resistor.
5. An electricity meter test isolation device as in claim 4, wherein said conversion unit comprises:
the inverting input end of the third amplifier is connected with the first output end of the coupler, and the non-inverting input end of the third amplifier is connected with the second output end of the coupler;
one end of the second capacitor is connected with the non-inverting input end of the third amplifier, and the other end of the second capacitor is grounded;
one end of the sixth resistor is connected with the non-inverting input end of the third amplifier, and the other end of the sixth resistor is grounded;
one end of the third capacitor is connected with the output end of the third amplifier, and the other end of the third capacitor is connected with the reverse input end of the third amplifier;
and one end of the seventh resistor is connected with the inverting input end of the third amplifier, and the other end of the seventh resistor is connected with the output end of the third amplifier.
6. An electricity meter test isolation device as in claim 5, wherein said conversion unit further comprises:
and one end of the potentiometer is connected with the other end of the sixth resistor, and the other end of the potentiometer is connected with the output end of the third amplifier.
7. An electricity meter test isolation device as defined in claim 6, wherein said optocoupler is of the type HCNR201.
8. An electricity meter test isolation device as in claim 7, wherein said optocoupler includes an LED, a first photodiode and a second photodiode highly matched thereto.
9. An electricity meter test isolation device as defined in claim 8, wherein the anode of said LED is connected to the positive supply terminal and the cathode thereof is connected to the other end of said fourth resistor.
10. An electricity meter test isolating device as in claim 8, wherein said first photodiode has its anode connected to the other end of said third resistor and its cathode connected to the other end of said fifth resistor; the cathode of the second photodiode is connected to the inverting input of the third amplifier, and the anode thereof is connected to the non-inverting input of the third amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222357233.XU CN218601357U (en) | 2022-09-06 | 2022-09-06 | Ammeter test isolating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222357233.XU CN218601357U (en) | 2022-09-06 | 2022-09-06 | Ammeter test isolating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218601357U true CN218601357U (en) | 2023-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222357233.XU Active CN218601357U (en) | 2022-09-06 | 2022-09-06 | Ammeter test isolating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218601357U (en) |
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2022
- 2022-09-06 CN CN202222357233.XU patent/CN218601357U/en active Active
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