CN220064222U - Residual current collection circuit - Google Patents
Residual current collection circuit Download PDFInfo
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- CN220064222U CN220064222U CN202321352920.0U CN202321352920U CN220064222U CN 220064222 U CN220064222 U CN 220064222U CN 202321352920 U CN202321352920 U CN 202321352920U CN 220064222 U CN220064222 U CN 220064222U
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- 238000002955 isolation Methods 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 32
- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
The utility model discloses a residual current collection circuit, which comprises a protection circuit module, an isolation amplifying module, an operational amplifying module and an analog-to-digital conversion module, wherein: the output end of the protection circuit module is connected with the input end of the isolation amplifying module, the output end of the isolation amplifying module is connected with the input end of the operational amplifying module, and the output end of the operational amplifying module is connected with the input end of the analog-to-digital conversion module. The residual current acquisition circuit provided by the utility model can simultaneously sample alternating current and direct current residual current, process the acquired alternating current and direct current residual current, and realize the protection and monitoring functions of the alternating current and direct current residual current.
Description
Technical Field
The utility model relates to the technical field of sampling circuits, in particular to a residual current collection circuit.
Background
Currently, the residual current release is classified into an AC type, a C type and a B type, wherein the AC and C types are used for AC residual current protection, and the B type release is used for AC and dc residual current protection. At present, B-type residual current protection in China is still in a development stage.
Along with the development of new energy automobiles, the charging pile also becomes a matched product which needs to be developed urgently, and along with the construction of a high-voltage power grid, the charging timeliness and the charging efficiency of the new energy automobiles are improved. However, the premise of convenience is that the power grid operation load is forcibly overdrawn, so that the power grid power supply pressure is increased.
Disclosure of Invention
The utility model aims to provide a residual current acquisition circuit which aims at the new energy and the access of an alternating current-direct current charging pile to a low-voltage distribution network and simultaneously has the requirement of acquiring alternating current residual current and direct current residual current.
In order to achieve the above object, the present utility model provides the following technical solutions: the utility model provides a residual current collection circuit, includes protection circuit module, isolation amplification module, operational amplification module and analog-to-digital conversion module, wherein:
the output end of the protection circuit module is connected with the input end of the isolation amplifying module, the output end of the isolation amplifying module is connected with the input end of the operational amplifying module, and the output end of the operational amplifying module is connected with the input end of the analog-to-digital conversion module.
Preferably, the protection circuit module is composed of a grounding parallel circuit, and the grounding parallel circuit is coupled with a piezoresistor.
Preferably, the isolation amplifying module includes an AMC1301DWVR amplifier, wherein:
the first pin and the fourth pin are coupled and connected with a third parallel circuit, and a capacitor C7 and a capacitor C8 are arranged on the third parallel circuit;
the second pin and the third pin are connected with the protection circuit module;
the eighth pin is provided with a fourth parallel circuit, and a capacitor C5 and a capacitor C6 are arranged on the fourth parallel circuit.
Preferably, the isolation amplifying module is coupled with a circuit, and the circuit comprises an F0505S-1WDC-DC isolation voltage power supply module, wherein:
the first pin and the second pin are provided with a first parallel circuit, and the first parallel circuit is respectively coupled with a capacitor C100, a capacitor C101 and a diode D1;
the seventh pin and the fifth pin are provided with a second parallel circuit, and the second parallel circuit is respectively connected with a capacitor C102, a capacitor C103 and a diode D2 in parallel.
Preferably, the power supply module is used for providing power for the operational amplification module, and comprises an ADP5070AREZ power supply chip, wherein:
the third pin is coupled to the second pin, the seventh pin is connected in parallel with a resistor R100 and a resistor R101, and the seventh pin and the second pin are connected in parallel with a capacitor C105 and a capacitor C106;
the fourteenth pin is coupled to the thirteenth pin, and a resistor R103 is arranged on the circuit;
the sixth pin, the sixteenth pin, the tenth pin, the eighth pin, the twelfth pin, the ninth pin, the eleventh pin, the nineteenth pin, the seventeenth pin and the eighteenth pin are all coupled to a circuit, and the nineteenth pin, the seventeenth pin and the eighteenth pin are connected in parallel with a capacitor C114 and a capacitor C115;
the fourth pin and the fifth pin are connected in parallel with the nineteenth pin.
Preferably, the analog-to-digital conversion module comprises a comparator, an integrator, a logic chip and a calculation chip;
the signal is introduced by a first pin of the comparator, the first pin of the integrator is connected in series with a third pin of the comparator, and a closed circuit is connected in parallel between the first pin of the integrator and the first pin of the comparator;
the first pin of the comparator is coupled with a rated resistor R4, the input end of the rated resistor R4 is connected in series with the first pin of the logic chip, and the third pin of the integrator is connected with the fourth pin of the logic chip;
the eighth pin of the logic chip is connected with the first pin of the computing chip.
In the technical scheme, the residual current collection circuit provided by the utility model has the following beneficial effects: the alternating current residual current signal can be acquired, the direct current residual current signal can be acquired, the acquired alternating current and direct current residual current is processed, and the functions of protecting and monitoring the alternating current and direct current residual current can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic diagram of a schematic structure provided in an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an operational amplifier circuit according to an embodiment of the present utility model;
fig. 3 is a schematic circuit diagram of a protection circuit module according to an embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of an isolation amplifying module according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a power circuit structure of an operational amplifier module according to an embodiment of the present utility model.
Detailed Description
In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-5, a residual current collection circuit includes a protection circuit module, an isolation amplifying module, an operational amplifying module and an analog-to-digital conversion module, wherein:
the output end of the protection circuit module is connected with the input end of the isolation amplifying module, the output end of the isolation amplifying module is connected with the input end of the operational amplifying module, and the output end of the operational amplifying module is connected with the input end of the analog-to-digital conversion module.
Specifically, in the implementation, the analog quantity signal of the alternating current and direct current is converted into the digital signal of the alternating current and direct current after being processed by the protection circuit module, the isolation amplifying module, the operational amplifying module and the analog-to-digital conversion module, so that the conversion from the analog quantity to the digital quantity is completed.
In the above embodiment, not only the ac residual current signal but also the dc residual current signal can be collected, and the sampling of the ac and dc residual currents can be satisfied at the same time, and the collected ac and dc residual currents are processed, so that the protection and monitoring functions of the ac and dc residual currents can be realized.
Further, as shown in fig. 4, the protection circuit module in the above embodiment is composed of a grounded parallel circuit, and the grounded parallel circuit is coupled with a varistor.
Specifically, the grounding parallel circuit in the circuit is connected with an IC coupler in parallel, the IC coupler is used for checking the threshold value of the circuit, when the voltage at two ends of the piezoresistor is higher than the threshold voltage, the current flowing through the piezoresistor is increased, the piezoresistor becomes a resistor with infinitesimal resistance value, and the resistor is equivalent to a closed switch, so that the protection of the subsequent circuit is realized. The voltage dependent resistor has a transient overvoltage protection function to realize stable inspection of input voltage, thereby forming a function similar to a closed switch, and further realizing a follow-up isolating amplifying module, an operational amplifying module and an analog-to-digital conversion module circuit to avoid burning out due to overlarge pressure.
Still further, as shown in fig. 4, the isolation amplifying module includes an AMC1301DWVR amplifier, wherein:
the first pin and the fourth pin are coupled and connected with a third parallel circuit, and a capacitor C7 and a capacitor C8 are arranged on the third parallel circuit;
the second pin and the third pin are connected with the protection circuit module;
the eighth pin is provided with a fourth parallel circuit, and the fourth parallel circuit is provided with a capacitor C5 and a capacitor C6.
Specifically, the F0505S-1WDC-DC isolation voltage power supply module can prevent noise current on a common-mode line from flowing into local ground, interfering or damaging a sensitive circuit, can realize sampling of alternating current and direct current, simplifies the design of a sampling loop, and is matched with a sampling resistor used by an isolation amplifying module, so that a precise resistor with high precision and low temperature drift is required to be selected.
Furthermore, in the above embodiment, the operational amplification module includes a triode, and the operational amplification module is configured to convert the double-ended differential sampling signal output by the isolation amplification module into a single-ended sampling signal, which corresponds to an open circuit for the front stage circuit and corresponds to a constant voltage source for the rear stage circuit, i.e. the output voltage is not affected by the impedance of the rear stage circuit.
Further, as shown in connection with fig. 5, the power module includes an ADP5070AREZ power chip in which:
the third pin is coupled to the second pin, the seventh pin is connected in parallel with a resistor R100 and a resistor R101, and the seventh pin and the second pin are connected in parallel with a capacitor C105 and a capacitor C106;
the fourteenth pin is coupled to the thirteenth pin, and a resistor R103 is arranged on the circuit;
the sixth pin, the sixteenth pin, the tenth pin, the eighth pin, the twelfth pin, the ninth pin, the eleventh pin, the nineteenth pin, the seventeenth pin and the eighteenth pin are all coupled to a circuit, and the nineteenth pin, the seventeenth pin and the eighteenth pin are connected in parallel with a capacitor C114 and a capacitor C115;
the fourth pin and the fifth pin are connected in parallel with the nineteenth pin.
Further, as shown in fig. 3, the analog-to-digital conversion module includes a comparator, an integrator, a logic chip and a computing chip;
the signal is introduced by the first pin of the comparator, the first pin of the integrator is connected in series with the third pin of the comparator, and a closed circuit is connected in parallel between the first pin of the integrator and the first pin of the comparator;
the first pin of the comparator is coupled with a rated resistor R4, the input end of the rated resistor R4 is connected in series with the first pin of the logic chip, and the third pin of the integrator is connected with the fourth pin of the logic chip;
the eighth pin of the logic chip is connected with the first pin of the computing chip.
Specifically, the comparator and the integrator are all triodes, and the circuit combination is used for converting the collected, amplified and conveyed analog quantity signals into digital quantity signals.
It should be noted that, each electronic component in the above embodiment belongs to an existing product, and a specific product model thereof is not disclosed in detail herein.
While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.
Claims (6)
1. The residual current collection circuit is characterized by comprising a protection circuit module, an isolation amplification module, an operational amplification module and an analog-to-digital conversion module, wherein:
the output end of the protection circuit module is connected with the input end of the isolation amplifying module, the output end of the isolation amplifying module is connected with the input end of the operational amplifying module, and the output end of the operational amplifying module is connected with the input end of the analog-to-digital conversion module.
2. The residual current collection circuit according to claim 1, wherein the protection circuit module is composed of a grounded parallel circuit, and a varistor is coupled to the grounded parallel circuit.
3. The residual current collection circuit of claim 1, wherein the isolation amplification module comprises an AMC1301DWVR amplifier, wherein:
the first pin and the fourth pin are coupled and connected with a third parallel circuit, and a capacitor C7 and a capacitor C8 are arranged on the third parallel circuit;
the second pin and the third pin are connected with the protection circuit module;
the eighth pin is provided with a fourth parallel circuit, and a capacitor C5 and a capacitor C6 are arranged on the fourth parallel circuit.
4. A residual current collection circuit according to claim 3 wherein said isolation amplifier module is coupled to a circuit comprising a F0505S-1WDC-DC isolated voltage power supply module, wherein:
the first pin and the second pin are provided with a first parallel circuit, and the first parallel circuit is respectively coupled with a capacitor C100, a capacitor C101 and a diode D1;
the seventh pin and the fifth pin are provided with a second parallel circuit, and the second parallel circuit is respectively connected with a capacitor C102, a capacitor C103 and a diode D2 in parallel.
5. A residual current collection circuit according to claim 3 further comprising a power module for providing power to said operational amplifier module, said power module comprising an ADP5070AREZ power chip wherein:
the third pin is coupled to the second pin, the seventh pin is connected in parallel with a resistor R100 and a resistor R101, and the seventh pin and the second pin are connected in parallel with a capacitor C105 and a capacitor C106;
the fourteenth pin is coupled to the thirteenth pin, and a resistor R103 is arranged on the circuit of the thirteenth pin;
the sixth pin, the sixteenth pin, the tenth pin, the eighth pin, the twelfth pin, the ninth pin, the eleventh pin, the nineteenth pin, the seventeenth pin and the eighteenth pin are all coupled to a circuit, and the nineteenth pin, the seventeenth pin and the eighteenth pin are connected in parallel with a capacitor C114 and a capacitor C115;
the fourth pin and the fifth pin are connected in parallel with the nineteenth pin.
6. The residual current collection circuit according to claim 1, wherein the analog-to-digital conversion module comprises a comparator, an integrator, a logic chip and a calculation chip;
the signal is introduced by a first pin of the comparator, the first pin of the integrator is connected in series with a third pin of the comparator, and a closed circuit is connected in parallel between the first pin of the integrator and the first pin of the comparator;
the first pin of the comparator is coupled with a rated resistor R4, the input end of the rated resistor R4 is connected in series with the first pin of the logic chip, and the third pin of the integrator is connected with the fourth pin of the logic chip;
the eighth pin of the logic chip is connected with the first pin of the computing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321352920.0U CN220064222U (en) | 2023-05-31 | 2023-05-31 | Residual current collection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321352920.0U CN220064222U (en) | 2023-05-31 | 2023-05-31 | Residual current collection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220064222U true CN220064222U (en) | 2023-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321352920.0U Active CN220064222U (en) | 2023-05-31 | 2023-05-31 | Residual current collection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220064222U (en) |
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2023
- 2023-05-31 CN CN202321352920.0U patent/CN220064222U/en active Active
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