CN211086549U - Grounding and phase error detection circuit of alternating current charging equipment - Google Patents
Grounding and phase error detection circuit of alternating current charging equipment Download PDFInfo
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- CN211086549U CN211086549U CN201921457416.0U CN201921457416U CN211086549U CN 211086549 U CN211086549 U CN 211086549U CN 201921457416 U CN201921457416 U CN 201921457416U CN 211086549 U CN211086549 U CN 211086549U
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Abstract
The application provides a ground connection and wrong phase detection circuit of alternating current charging equipment, relates to the equipment detection field. The grounding and phase-dislocation detection circuit of the alternating current charging equipment comprises a live wire, a zero line, a ground wire, an mutual inductor and a controller, wherein the ground wire is respectively connected with the live wire and the zero line; the mutual inductor is used for inducing voltage between a zero line and a ground wire; the controller is used for determining the grounding and phase error states of the alternating current charging equipment according to the voltage of the secondary coil of the mutual inductor. The grounding and phase error detection circuit of the alternating current charging equipment has the advantage of more accurate determination of grounding and phase error states.
Description
Technical Field
The application relates to the field of equipment detection, in particular to a grounding and phase error detection circuit of alternating current charging equipment.
Background
With the improvement of energy conservation and environmental protection consciousness, the new energy automobile market is mature day by day, and for the new energy automobile, the alternating current charging equipment is necessary.
However, many existing ac charging devices do not have the grounding and phase error detection function, and even some ac charging devices have the grounding and phase error detection function, there is a problem that the detection circuit is not isolated from the ac power grid and is easily interfered by the harmonic waves of the ac power grid, so that the detection is not accurate.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a grounding and phase error detection circuit of alternating current charging equipment, so as to solve the problem that the grounding and phase error detection of the alternating current charging equipment is inaccurate in the prior art.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
the embodiment of the utility model provides a ground connection and wrong looks detection circuitry of alternating current charging equipment, the ground connection and wrong looks detection circuitry of alternating current charging equipment includes live wire, zero line, ground wire, mutual-inductor and controller, the ground wire respectively with the live wire, zero line electricity is connected, the primary coil of mutual-inductor connect in the ground wire with between the zero line, the secondary coil of mutual-inductor with the controller electricity is connected;
the mutual inductor is used for inducing voltage between the zero line and the ground wire;
the controller is used for determining the voltage between the zero line and the ground wire according to the voltage of the secondary coil of the mutual inductor so as to determine the grounding and phase error states of the alternating current charging equipment.
Further, the controller is configured to determine that the ground state of the ac charging apparatus is a ground-free state when the voltage of the secondary coil of the transformer is equal to half of the input voltage;
the controller is further configured to determine that the ground state of the ac charging device is a ground-to-earth state when the voltage of the secondary coil of the transformer is equal to 0V.
Further, the controller is configured to determine that the phase error state of the ac charging apparatus is a phase error when the voltage of the secondary coil of the transformer is equal to the input voltage;
the controller is further used for determining that the phase error state of the alternating current charging equipment is not in phase error when the voltage of the secondary coil of the mutual inductor is not equal to the input voltage.
Further, the grounding and phase-dislocation detection circuit of the alternating current charging equipment further comprises a voltage measuring circuit, wherein the voltage measuring circuit is respectively electrically connected with the live wire, the zero line and the controller, so that the controller can obtain the voltage between the live wire and the zero line through the voltage measuring circuit.
Further, the ground connection and the wrong phase detection circuit of the alternating current charging equipment further comprise a first filter device and a second filter device, the first filter device is connected with the live wire and the ground wire, and the second filter device is connected with the zero wire and the ground wire.
Further, the first filter device and the second filter device each include a capacitor.
Furthermore, the grounding and phase-error detection circuit of the alternating current charging equipment further comprises a first resistor, and the first resistor is connected between the zero line and the primary coil of the mutual inductor.
Furthermore, the grounding and phase-dislocation detection circuit of the alternating current charging equipment further comprises a second resistor, two ends of the second resistor are respectively electrically connected with two ends of the secondary coil of the mutual inductor, and one end of the second resistor is grounded.
Furthermore, the grounding and phase error detection circuit of the alternating current charging equipment further comprises an operational amplifier, wherein the non-inverting input end of the operational amplifier is grounded, the inverting input end of the operational amplifier is electrically connected with the secondary coil of the mutual inductor, and the output end of the operational amplifier is electrically connected with the controller.
Furthermore, the grounding and phase-error detection circuit of the alternating current charging equipment further comprises a filter capacitor and a third resistor, and two ends of the capacitor and the third resistor are respectively and electrically connected with the inverting input end and the output end of the operational amplifier.
Compared with the prior art, the method has the following beneficial effects:
the application provides a grounding and phase error detection circuit of alternating current charging equipment, which comprises a live wire, a zero line, a ground wire, a mutual inductor and a controller, wherein the ground wire is connected between the live wire and the zero line, a primary coil of the mutual inductor is connected between the ground wire and the zero line, and a secondary coil of the mutual inductor is electrically connected with the controller; the mutual inductor is used for inducing voltage between a zero line and a ground wire; the controller is used for determining the voltage between the zero line and the ground wire according to the voltage of the secondary coil of the mutual inductor so as to determine the grounding and phase error states of the alternating current charging equipment. On the one hand, the grounding and phase error detection circuit of the alternating current charging equipment can determine the grounding and phase error state of the alternating current charging equipment in a mode that the controller acquires the voltage of the secondary electric wire, so that the grounding and phase error detection function can be realized. On the other hand, the mutual inductor is arranged, so that the controller is isolated from the live wire, the zero line and the ground wire, the controller is not interfered by harmonics of an alternating current power grid when the controller determines the grounding and phase-dislocation states, and the determination of the grounding and phase-dislocation states is more accurate.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a circuit for detecting a ground fault and a phase error of an ac charging apparatus according to an embodiment of the present disclosure.
In the figure: 100-a ground and phase error detection circuit of an alternating current charging device; 110-a fire line; 120-neutral; 130-ground line; 140-a transformer; 150-a controller; 160-first filter device; 170-a second filter device; 180-a first resistance; 190-a second resistance; 200-an operational amplifier; 210-a filter capacitance; 220-a third resistance; 230-voltage measurement circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present invention provides a grounding and phase-error detecting circuit 100 of an ac charging device, where the grounding and phase-error detecting circuit 100 of the ac charging device includes a live wire 110, a zero line 120, a ground wire 130, a transformer 140 and a controller 150, the ground wire 130 is connected between the live wire 110 and the zero line 120, a primary coil of the transformer 140 is connected between the ground wire 130 and the zero line 120, and a secondary coil of the transformer 140 is electrically connected to the controller 150. Through the grounding and phase error detection circuit 100 of the alternating current charging equipment provided by the application, whether the alternating current charging equipment is grounded or has a phase error can be determined, and the controller 150 is isolated from an alternating current power grid through the mutual inductor 140, so that the controller 150 is not subjected to harmonic interference when determining the grounding and phase error states of the alternating current charging equipment, and the determination result is more accurate.
Specifically, in the present embodiment, the grounding finger 130 is connected to the ground, and the phase error indicates whether the connection between the live wire 110 and the neutral wire 120 is reversed, as shown in the figure, when L is connected to the live wire 110, N is connected to the neutral wire 120, the phase error of the ac charging device does not exist, and when L is connected to the neutral wire 120, N is connected to the live wire 110, the phase error of the ac charging device exists.
The live wire 110, the neutral wire 120 and the ground wire 130 are connected to the power supply device, so that the transformer 140 can sense a voltage between the neutral wire 120 and the ground wire 130, and the controller 150 can determine a grounding and phase-error state of the ac charging device according to a voltage of a secondary coil of the transformer 140, and determine whether the ground wire 130 is grounded and whether the live wire 110 and the neutral wire 120 are reversely connected.
The basis for the controller 150 to determine whether the ac charging device is grounded is as follows:
when the controller 150 receives that the voltage of the secondary coil of the transformer 140 is equal to half of the input voltage, it is determined that the ground state of the ac charging apparatus is the ground-not-ground state.
When the controller 150 receives 0V of the secondary coil of the transformer 140, it determines that the ground state of the ac charging device is a ground-to-earth state. The voltage of the secondary coil of the transformer 140 is considered to be equal to 0V when the voltage of the secondary coil of the transformer 140 is within a range section close to 0V, that is, due to the existence of an error, the voltage of the secondary coil of the transformer 140 is considered to be equal to 0V, and the grounding state of the ac charging apparatus is determined to be a grounding state, for example, the range section may be 0V-2V.
The controller 150 determines whether the ac charging device is out of phase according to the following criteria:
when the voltage of the secondary coil of the transformer 140 received by the controller 150 is equal to the input voltage, determining that the phase error state of the ac charging apparatus is a phase error;
when the voltage of the secondary coil of the transformer 140 received by the controller 150 is not equal to the input voltage, it is determined that the phase error state of the ac charging apparatus is not phase error.
The operation principle of the grounding and phase error detection circuit 100 of the ac charging apparatus provided in the present application is specifically described below.
In this embodiment, in order to detect the voltages between the live wire 110, the neutral wire 120 and the ground wire 130, the grounding and phase error detection circuit 100 of the ac charging apparatus further includes a first filter device 160 and a second filter device 170, the first filter device 160 is connected between the live wire 110 and the ground wire 130, and the second filter device 170 is connected between the neutral wire 120 and the ground wire 130.
The effect of filtering can be realized by arranging the first filter device and the second filter device, wherein the first filter device 160 and the second filter device 170 can be both capacitors, and the first filter device 160 and the second filter device 170 are both Y capacitors, namely safety capacitors, after the capacitors are failed, electric shock can not be caused, and personal safety is not endangered.
Moreover, when the first filter device 160 and the second filter device 170 are both Y capacitors, the capacitance values of the two capacitors are generally equal.
Further, since the voltage flowing through the primary coil of the transformer 140 is the power supply voltage of the power supply device in the phase error state, the transformer 140 coil may be burned out, and therefore, the grounding and phase error detection circuit 100 of the ac charging device further includes a first resistor 180, and the first resistor 180 is connected between the zero line 120 and the primary coil of the transformer 140. Through the current limiting effect of the resistor, even in a phase-staggered state, the current flowing through the coil of the transformer 140 is not too high, so that the coil of the transformer 140 is protected.
Further, in the transformer 140 provided in the present application, the primary coil includes a first end and a second end, and the secondary coil includes a third end and a fourth end, wherein the first end is electrically connected to the zero line 120 through the first resistor 180, the second end is electrically connected to the ground line 130, the third end is grounded, the fourth end is electrically connected to the operational amplifier 200, and the first end and the third end of the transformer 140 are homonymous ends.
Further, the grounding and phase-error detecting circuit 100 of the ac charging apparatus further includes a second resistor 190, two ends of the second resistor 190 are electrically connected to two ends of the secondary coil of the transformer 140, respectively, and one end of the second resistor 190 is grounded. One end of the second resistor 190 electrically connected to the third end of the transformer 140 is grounded. By providing the second resistor 190, the conversion between current and voltage can be realized.
Further, the grounding and phase error detection circuit 100 of the ac charging device further includes an operational amplifier 200, a non-inverting input terminal of the operational amplifier 200 is grounded, an inverting input terminal of the operational amplifier 200 is electrically connected to the secondary coil of the transformer 140, and an output terminal of the operational amplifier 200 is electrically connected to the controller 150. The operational amplifier 200 can amplify the voltage information and transmit the amplified voltage information to the controller 150, so that the controller 150 can more accurately obtain the voltage of the secondary coil of the transformer 140.
Meanwhile, in order to implement filtering and limit amplification factor, the grounding and phase-error detection circuit 100 of the ac charging device further includes a filtering capacitor 210 and a third resistor 220, and both ends of the capacitor and the third resistor 220 are respectively electrically connected to the inverting input terminal and the output terminal of the operational amplifier 200.
Further, in order to make the detection result more accurate, in this embodiment, the ac charging apparatus further includes a voltage measuring circuit 230, and the voltage measuring circuit 230 is electrically connected to the live wire, the neutral wire and the controller, respectively, so that the controller obtains the voltage between the live wire and the neutral wire through the voltage measuring circuit 230. The voltage measuring circuit 230 provided in this embodiment also includes a transformer and an operational amplifier, and the controller can determine the voltage of the secondary coil of the transformer through the output voltage of the amplifier, so as to determine the voltage between the live wire and the zero wire.
It should be noted that, by providing the voltage measuring circuit 230, the controller can accurately obtain the voltage of the power supply device, and then the grounding and phase-error detection state of the ac charging device can be determined by obtaining the voltage between the zero line and the ground line, so that the determination result is more accurate.
Taking a power supply device as a commercial power as an example for explanation, the working principle of the grounding and phase error detection circuit 100 of the ac charging device provided by the present application is as follows:
when the live wire 110 and the neutral wire 120 are connected to the commercial power, when the voltage between the neutral wire 120 and the ground wire 130 is equal to 0V, it indicates that the ground wire 130 is in a grounded state, and when the voltage between the neutral wire 120 and the ground wire 130 is equal to one half of the voltage value of the commercial power, it indicates that the ground wire 130 is in a non-grounded state.
It should be noted that, because the utility power may fluctuate, for example, during a peak period of power consumption, the utility power may have only 200V, not 220V, so that the voltage measuring circuit 230 can accurately measure the current accurate voltage of the utility power, and provide conditions for accurately determining the grounding and phase error states.
It should be noted that, because there is a loss in the actual circuit, the voltage between the null line 120 and the ground line 130 is equal to approximately half of the utility power, and may be defined as equal to half of the utility power within a certain range, for example, when the utility power voltage measured by the voltage measuring current is 220V, the voltage may be defined as equal to half of the utility power between 105V and 115V.
When the voltage between the zero line 120 and the ground line 130 is equal to the commercial power, it indicates that the live line 110 and the zero line 120 are out of phase; when the voltage between the zero line 120 and the ground line 130 is greater than 0V and not equal to the commercial power, it indicates that the live line 110 and the zero line 120 are not out of phase. It is understood that the present application is equal to the commercial power, and in fact, when the voltage is within a range, it can be defined as equal to the commercial power.
In summary, the present application provides a grounding and phase-dislocation detection circuit of an ac charging device, the grounding and phase-dislocation detection circuit of the ac charging device includes a live wire, a zero line, a ground wire, a mutual inductor and a controller, the ground wire is connected between the live wire and the zero line, a primary coil of the mutual inductor is connected between the ground wire and the zero line, and a secondary coil of the mutual inductor is electrically connected with the controller; the mutual inductor is used for inducing voltage between a zero line and a ground wire; the controller is used for determining the grounding and phase error states of the alternating current charging equipment according to the voltage of the secondary coil of the mutual inductor. On the one hand, the grounding and phase error detection circuit of the alternating current charging equipment can determine the grounding and phase error state of the alternating current charging equipment in a mode that the controller acquires the voltage of the secondary electric wire, so that the grounding and phase error detection function can be realized. On the other hand, the mutual inductor is arranged, so that the controller is isolated from the live wire, the zero line and the ground wire, the controller is not interfered by harmonics of an alternating current power grid when the controller determines the grounding and phase-dislocation states, and the determination of the grounding and phase-dislocation states is more accurate. .
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The grounding and phase-dislocation detection circuit of the alternating current charging equipment is characterized by comprising a live wire, a zero line, a ground wire, a mutual inductor and a controller, wherein the ground wire is respectively electrically connected with the live wire and the zero line;
the mutual inductor is used for inducing voltage between the zero line and the ground wire;
the controller is used for determining the voltage between the zero line and the ground wire according to the voltage of the secondary coil of the mutual inductor so as to determine the grounding and phase error states of the alternating current charging equipment.
2. The ground and phase error detection circuit for an ac charging device of claim 1, wherein said controller is configured to determine that the ground state of the ac charging device is a ground-less state when the voltage of the secondary winding of the transformer is equal to half of the input voltage;
the controller is further configured to determine that the ground state of the ac charging device is a ground-to-earth state when the voltage of the secondary coil of the transformer is equal to 0V.
3. The ground and phase error detection circuit of an ac charging device according to claim 1, wherein said controller is configured to determine that the phase error state of the ac charging device is a phase error when the voltage of the secondary coil of the transformer is equal to the input voltage;
the controller is further used for determining that the phase error state of the alternating current charging equipment is not in phase error when the voltage of the secondary coil of the mutual inductor is not equal to the input voltage.
4. The grounding and phase error detection circuit of an ac charging device as claimed in claim 1, wherein the grounding and phase error detection circuit of an ac charging device further comprises a voltage measuring circuit, and the voltage measuring circuits are electrically connected to the live wire, the neutral wire and the controller respectively, so that the controller obtains the voltage between the live wire and the neutral wire through the voltage measuring circuits.
5. The ac charging apparatus ground and phase error detection circuit of claim 1, further comprising a first filter and a second filter, wherein said first filter is connected between said live line and said ground line, and said second filter is connected between said neutral line and said ground line.
6. The ac charging apparatus ground and phase error detection circuit of claim 5, wherein said first filter device and said second filter device each comprise a capacitor.
7. The ac charging apparatus ground and phase error detection circuit of claim 1, wherein said ac charging apparatus ground and phase error detection circuit further comprises a first resistor connected between said neutral line and a primary coil of said transformer.
8. The grounding and phase error detection circuit of an ac charging device according to claim 1, wherein said grounding and phase error detection circuit of an ac charging device further comprises a second resistor, two ends of said second resistor are electrically connected to two ends of the secondary coil of said transformer, respectively, and one end of said second resistor is grounded.
9. The ground and phase error detection circuit for an ac charging device of claim 1, further comprising an operational amplifier having a non-inverting input connected to ground, an inverting input electrically connected to the secondary winding of the transformer, and an output electrically connected to the controller.
10. The ground and phase error detection circuit for an ac charging device of claim 9, further comprising a filter capacitor and a third resistor, wherein both ends of said capacitor and said third resistor are electrically connected to the inverting input terminal and the output terminal of said operational amplifier, respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921457416.0U CN211086549U (en) | 2019-09-04 | 2019-09-04 | Grounding and phase error detection circuit of alternating current charging equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921457416.0U CN211086549U (en) | 2019-09-04 | 2019-09-04 | Grounding and phase error detection circuit of alternating current charging equipment |
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| CN211086549U true CN211086549U (en) | 2020-07-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412401A (en) * | 2019-09-04 | 2019-11-05 | 安费诺汽车连接系统（常州）有限公司 | A kind of ground connection of AC charging equipment and misphase detection circuit |
| CN112946535A (en) * | 2021-02-25 | 2021-06-11 | 广汽丰田汽车有限公司 | Power supply socket abnormity detection device, power consumption protection device and charging protection device |
-
2019
- 2019-09-04 CN CN201921457416.0U patent/CN211086549U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412401A (en) * | 2019-09-04 | 2019-11-05 | 安费诺汽车连接系统（常州）有限公司 | A kind of ground connection of AC charging equipment and misphase detection circuit |
| CN110412401B (en) * | 2019-09-04 | 2024-09-03 | 安费诺汽车连接系统（常州）有限公司 | Grounding and phase-dislocation detection circuit of alternating-current charging equipment |
| CN112946535A (en) * | 2021-02-25 | 2021-06-11 | 广汽丰田汽车有限公司 | Power supply socket abnormity detection device, power consumption protection device and charging protection device |
| CN112946535B (en) * | 2021-02-25 | 2024-08-13 | 广汽丰田汽车有限公司 | Power supply socket abnormality detection device, power consumption protection device and charging protection device |
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