CN216848061U - Adhesion detection circuit of contactor, vehicle-mounted quick-charging contactor and battery car - Google Patents
Adhesion detection circuit of contactor, vehicle-mounted quick-charging contactor and battery car Download PDFInfo
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- CN216848061U CN216848061U CN202123448798.0U CN202123448798U CN216848061U CN 216848061 U CN216848061 U CN 216848061U CN 202123448798 U CN202123448798 U CN 202123448798U CN 216848061 U CN216848061 U CN 216848061U
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Abstract
The utility model discloses an adhesion detection circuitry, on-vehicle contactor and battery car of filling soon of contactor belongs to contactor technical field. The utility model discloses the contactor includes: a first contactor and a second contactor; the first end of the first contactor is connected with the positive power supply input end; the first end of the second contactor is connected with the negative power supply input end; the adhesion detection circuit includes: the sampling circuit comprises a first sampling circuit, a second sampling circuit, a current guide circuit and a controller; the input end of the drainage circuit is connected with the input end of the positive power supply, the output end of the drainage circuit is connected with the input end of the negative power supply, and the first sampling circuit is used for collecting a first voltage; the second sampling circuit is used for collecting a second voltage; and the controller is used for determining the switching state of the second contactor according to the first voltage and the second voltage. The utility model discloses a first voltage and second voltage judge the on-off state of second contactor, improve the accuracy that second contactor on-off state judged.
Description
Technical Field
The utility model relates to a contactor technical field especially relates to an adhesion detection circuitry, on-vehicle contactor and battery car of filling soon of contactor.
Background
The contactor is a control electrical appliance for automatically connecting or disconnecting a large-current circuit, and is widely applied to occasions such as factories, automatic control, electric power distribution and the like, for example, the contactor can be used in a vehicle control system, the contactor can realize overload protection when a vehicle is charged, and when a charging port outputs voltage and current to a high-voltage battery, the contactor can timely disconnect a charging circuit through on-off control to avoid damage of subsequent load equipment. If the contact of contactor takes place the adhesion, then can't break off the charging circuit, easily make load equipment burn out in the vehicle, cause the casualties even.
At present, an existing circuit topology for detecting adhesion of a contactor is shown in fig. 1, a voltage on a vehicle-mounted high-voltage battery side is detected by U1, a diagonal voltage is detected by U2, a voltage on a fast charging port side is detected by U3, during a detection process, a state of a relay K1 is judged by detecting voltages of U1 and U2, then the relay K1 is closed, and a state of the relay K2 is judged by detecting voltages of U2 and U3, while since the U3 sampling operational amplifier power supply and the U2 sampling power supply are grounded, two ends of the relay K2 are equivalently connected in parallel with a resistor in parallel, when the relay K1 is closed, the voltage of the U3 is very close to the voltage of the U2 no matter whether the relay K2 is closed, so that a misjudgment is caused on and off states of the relay K2. Therefore, the accuracy of judging the state of the contactor switch in the adhesion detection of the contactor in the prior art is lower.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides an adhesion detection circuitry, on-vehicle contactor and battery car of filling soon of contactor, aim at solving the lower technical problem of contactor on-off state judgement accuracy in the adhesion detection of prior art contactor.
In order to achieve the above object, the utility model provides an adhesion detection circuit of contactor, the contactor includes: a first contactor and a second contactor; the first end of the first contactor is connected with the positive power supply input end; the first end of the second contactor is connected with the negative power supply input end;
the adhesion detection circuit includes: the sampling circuit comprises a first sampling circuit, a second sampling circuit, a current guide circuit and a controller; the first sampling end of the first sampling circuit and the first sampling end of the second sampling circuit are arranged between the first end of the first contactor and the positive power supply input end, the second sampling end of the first sampling circuit is arranged between the first end of the second contactor and the negative power supply input end, and the second sampling end of the second sampling circuit is connected with the second end of the second contactor; the input end of the drainage circuit is connected with the input end of the positive power supply, the output end of the drainage circuit is connected with the input end of the negative power supply, and the controller is respectively connected with the output end of the first sampling circuit and the output end of the second sampling circuit;
the first sampling circuit is used for collecting a first voltage;
the second sampling circuit is used for collecting a second voltage;
the controller is used for determining the switch state of the second contactor according to the first voltage and the second voltage.
Optionally, the current steering circuit comprises: a resistance;
the first end of the resistor is connected with the positive power supply input end, and the second end of the resistor is connected with the negative power supply input end.
Optionally, the adhesion detection circuit of the contactor further includes: the switching circuit is arranged on the sampling loops of the first sampling circuit and the second sampling circuit;
the switch circuit is used for switching on or off the sampling loop.
Optionally, the switching circuit comprises: a first switch;
the first end of the first switch is arranged between the first end of the first contactor and the positive power input end, and the second end of the first switch is connected with the first sampling end of the first sampling circuit and the first sampling end of the second sampling circuit respectively.
Optionally, the switching circuit further comprises: a second switch;
the first end of the second switch is connected with the second sampling end of the first sampling circuit, and the second end of the second switch is respectively connected with the first end of the second contactor and the negative power supply input end.
Optionally, the first switch and the second switch are both in an open state when both the first contactor and the second contactor are in an open state.
Optionally, the first switch and the second switch are relay switches.
Optionally, the adhesion detection circuit further comprises: a third sampling circuit; the first sampling end of the third sampling circuit is connected with the second end of the first contactor, the second sampling end of the third sampling circuit is connected with the second end of the second contactor, and the output end of the third sampling circuit is connected with the controller;
the third sampling circuit is used for collecting a third voltage;
the controller is further configured to determine a switching state of the first contactor according to the second voltage and the third voltage.
Furthermore, for realizing the above object, the utility model discloses still provide a vehicle-mounted contactor that fills soon, vehicle-mounted contactor that fills soon contains as the above adhesion detection circuitry of contactor.
Furthermore, in order to realize the above object, the utility model discloses still provide a battery car, battery car includes as above on-vehicle fill contactor soon.
Adhesion detection circuitry of contactor includes: contactor and adhesion detection circuitry, the contactor includes: a first contactor and a second contactor; the first end of the first contactor is connected with the positive power supply input end; the first end of the second contactor is connected with the negative power supply input end; the adhesion detection circuit includes: the sampling circuit comprises a first sampling circuit, a second sampling circuit, a current guide circuit and a controller; the first sampling end of the first sampling circuit and the first sampling end of the second sampling circuit are arranged between the first end of the first contactor and the positive power supply input end, the second sampling end of the first sampling circuit is arranged between the first end of the second contactor and the negative power supply input end, and the second sampling end of the second sampling circuit is connected with the second end of the second contactor; the input end of the drainage circuit is connected with the input end of the positive power supply, the output end of the drainage circuit is connected with the input end of the negative power supply, and the controller is respectively connected with the output end of the first sampling circuit and the output end of the second sampling circuit; the first sampling circuit is used for collecting a first voltage; the second sampling circuit is used for collecting a second voltage; the controller is used for determining the switch state of the second contactor according to the first voltage and the second voltage. The utility model discloses a first voltage and second voltage judge the on off state of second contactor, improve the accuracy that contactor on-off state judged.
Drawings
FIG. 1 is a schematic diagram of a sticking detection circuit of a conventional contactor;
fig. 2 is a block diagram of a first embodiment of an adhesion detection circuit of a contactor according to the present invention;
fig. 3 is a block diagram of a second embodiment of the adhesion detection circuit of the contactor according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
30 | Current-guiding |
| 101 | |
301 | Resistance (RC) |
| 102 | |
40 | Controller |
| VCC1+ | Positive power |
50 | Switching circuit |
| VCC1- | Negative |
501 | First switch |
| 20 | |
502 | The second switch |
| 21 | Second sampling circuit | VCC2+ | Positive electrode battery input terminal |
| 22 | Third sampling circuit | VCC2- | Negative battery input terminal |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be noted that the utility model provides a contactor can be applied to different application scenarios, is applied to the charging circuit in the on-vehicle scene of charging especially. Wherein, the utility model discloses adhesion based on contactor detects, provides following embodiment:
referring to fig. 2, fig. 2 is a block diagram of a first embodiment of an adhesion detection circuit of a contactor according to the present invention.
The embodiment of the utility model provides an adhesion detection circuitry of contactor, contactor 10 includes: a first contactor 101 and a second contactor 102; the first end of the first contactor 101 is connected with a positive power supply input end VCC1 +; the first end of the second contactor 102 is connected with a negative power input terminal VCC 1-; the adhesion detection circuit includes: a first sampling circuit 20, a second sampling circuit 21, a current steering circuit 30, and a controller 40.
It should be noted that the adhesion detection circuit of the contactor is suitable for a common contactor and can also be applied to a quick-charging contactor on an electric automobile.
It should be understood that the contact circuit may be comprised of a main positive contact and a main negative contact, the first terminal of the first contactor 101 being connected to the positive power input VCC1+, being the main positive contact, the first contactor 101 being configured to turn on or off the circuit between the positive power input VCC1+ to the adhesion detection circuit of the contactor, the first terminal of the second contactor 102 being connected to the negative power input VCC1-, being the main negative contactor, the second contactor 102 being configured to turn on or off the circuit between the negative power input VCC 1-to the adhesion detection circuit of the contactor.
The first sampling end of the first sampling circuit 20 and the first sampling end of the second sampling circuit 21 are disposed between the first end of the first contactor 101 and the positive power input end VCC1+, the second sampling end of the first sampling circuit 20 is disposed between the first end of the second contactor 102 and the negative power input end VCC1-, and the second sampling end of the second sampling circuit 21 is connected to the second end of the second contactor 102; the first sampling circuit 20 is configured to collect a first voltage; the second sampling circuit 21 is configured to collect a second voltage.
It is understood that the first voltage is the voltage across the positive power input terminal VCC1+ and the negative power input terminal VCC1-, and the first sampling circuit 20 is configured to collect the voltage across the positive power input terminal VCC1+ and the negative power input terminal VCC 1-. The second voltage is the sum of the voltages at the two ends of the positive power input terminal VCC1+ and the negative power input terminal VCC 1-and the voltage of the second contactor 102, and the second sampling circuit 21 is configured to collect the sum of the voltages at the two ends of the positive power input terminal VCC1+ and the negative power input terminal VCC 1-and the voltage of the second contactor 102.
The input end of the current-guiding circuit 30 is connected with the positive power input end VCC1+, the output end of the current-guiding circuit 30 is connected with the negative power input end VCC1-, and the controller 40 is respectively connected with the output end of the first sampling circuit 20 and the output end of the second sampling circuit 21; the controller 40 is configured to determine a switching state of the second contactor 102 according to the first voltage and the second voltage.
In a specific implementation, the input terminal of the current guiding circuit 30 is connected to the positive power input terminal VCC1+, the output terminal of the current guiding circuit 30 is connected to the negative power input terminal VCC1-, the current at the power input terminal is introduced into the second contactor 102, and the current flowing through the second contactor 102 is increased, so that the voltage of the second contactor 102 collected by the second sampling circuit 21 is increased, so that when the second contactor 102 is disconnected, the second voltage collected by the second sampling circuit 21 is much greater than the first voltage collected by the first sampling circuit 20, and when the second contactor 102 is connected, the second voltage collected by the second sampling circuit 21 is equal to the first voltage collected by the first sampling circuit 20, the controller 40 is configured to compare the first voltage collected by the first sampling circuit 20 with the second voltage collected by the second sampling circuit 21, so as to determine the on-off state of the second contactor 102, the accuracy of the detection of the switching state of the second contactor 102 is improved.
Adhesion detection circuitry of contactor includes: contactor and adhesion detection circuitry, the contactor includes: a first contactor and a second contactor; the first end of the first contactor is connected with the positive power supply input end; the first end of the second contactor is connected with the negative power supply input end; the adhesion detection circuit includes: the sampling circuit comprises a first sampling circuit, a second sampling circuit, a current guide circuit and a controller; the first sampling end of the first sampling circuit and the first sampling end of the second sampling circuit are arranged between the first end of the first contactor and the positive power supply input end, the second sampling end of the first sampling circuit is arranged between the first end of the second contactor and the negative power supply input end, and the second sampling end of the second sampling circuit is connected with the second end of the second contactor; the input end of the drainage circuit is connected with the input end of the positive power supply, the output end of the drainage circuit is connected with the input end of the negative power supply, and the controller is respectively connected with the output end of the first sampling circuit and the output end of the second sampling circuit; the first sampling circuit is used for collecting a first voltage; the second sampling circuit is used for collecting a second voltage; the controller is used for determining the switch state of the second contactor according to the first voltage and the second voltage. The utility model discloses a first voltage and second voltage judge the on-off state of second contactor, improve the accuracy that contactor on-off state judged.
Referring to fig. 3, fig. 3 is a block diagram of a second embodiment of the adhesion detection circuit of the contactor according to the present invention.
In this embodiment, the current guiding circuit 30 includes: a resistor 301; the first end of resistance 301 with positive power input VCC1+ is connected, the second end of resistance 301 with negative power input VCC 1-is connected.
It can be understood that the resistor 301 is connected in parallel with the positive power input terminal VCC1+ and the negative power input terminal VCC1-, and the resistance and the number of the resistor 301 can be set according to actual requirements, by setting the resistor 301, after the first contactor 101 is closed, the detection voltage of the first sampling circuit 20 is prevented from being very large, and further approaching to the detection voltage of the second sampling circuit 21, thereby causing misjudgment on the switching state of the second contactor 102, and improving the accuracy of the detection of the switching state of the second contactor 103.
In this embodiment, the adhesion detection circuit of the contactor further includes: a switch circuit 50, wherein the switch circuit 50 is disposed on the sampling loops of the first sampling circuit 20 and the second sampling circuit 21; the switching circuit 50 is used for switching on or off the sampling loop. The switching circuit 50 includes: a first switch 501; the first end of the first switch 501 is arranged between the first end of the first contactor 101 and the positive power input end VCC1+, and the second end of the first switch 501 is connected to the first sampling end of the first sampling circuit 20 and the first sampling end of the second sampling circuit 21 respectively. The switching circuit 50 further includes: a second switch 502; a first terminal of the second switch 502 is connected to the second sampling terminal of the first sampling circuit 20, and a second terminal of the second switch 502 is connected to the first terminal of the second contactor 102 and the negative power input terminal VCC1 —, respectively.
It should be noted that the first switch 501 and the second switch 502 are both completely disconnectable switches. Wherein, the switch that can be completely disconnected refers to: and a switch, such as a relay switch, which can make the connected circuit in a completely disconnected state after receiving the turn-off trigger command.
The turn-off trigger command may be issued by the controller 40, and neither the first switch 501 nor the second switch 502 may be a switch in the form of a semiconductor to open a circuit, such as a field effect transistor.
In a specific implementation, the first switch 501 and the second switch 502 are both in an open state when both the first contactor 101 and the second contactor 102 are in an open state.
By arranging the first switch circuit 501 and the second switch circuit 502 on the sampling loops of the first sampling circuit 20 and the second sampling circuit 21, when the first contactor 101 and the second contactor 102 are both in an off state, the controller 40 generates a turn-off signal to control the first switch 501 and the second switch 502 to be turned off, so that the voltage generated at the power input end cannot be transmitted to subsequent circuits through the first sampling circuit 20 and the second sampling circuit 21, the situation that the voltage generated at the power input end is greater than the human safety, the personal safety is endangered is avoided, and the safety is improved.
In this embodiment, the adhesion detection circuit further includes: a third sampling circuit 22; a first sampling end of the third sampling circuit 22 is connected to the second end of the first contactor 101, a second sampling end of the third sampling circuit 22 is connected to the second end of the second contactor 102, and an output end of the third sampling circuit 22 is connected to the controller 40; the third sampling circuit 22 is configured to collect a third voltage; the controller 40 is further configured to determine a switching state of the first contactor 101 according to the second voltage and the third voltage.
The third sampling circuit 22 is further connected to the battery input terminal, the first sampling terminal of the third sampling circuit 22 is connected to the positive battery input terminal VCC2+, the second sampling terminal of the third sampling circuit 22 is connected to the negative battery input terminal VCC2-, the third sampling circuit 22 collects voltages at the positive battery input terminal VCC2+ and the negative battery input terminal VCC2-, the third voltage is a voltage at both the positive battery input terminal VCC2+ and the negative battery input terminal VCC2-, the controller 40 is configured to receive the third voltage and the second voltage, detect the on-off state of the first contactor 101 through the third voltage and the second voltage, when the first contactor 101 is closed, the third voltage is equal to the second voltage, the voltages collected at both the positive battery input terminal VCC2+ and the negative battery input terminal VCC 2-by the second sampling circuit 21 and the third sampling circuit 22,
the current guiding circuit 30 in this embodiment includes: a resistor 301; through the electric current at resistance 301 increase second contactor 102 both ends to the voltage at increase second contactor 102 both ends avoids the first voltage that first sampling circuit 20 gathered to be close with the second voltage that second sampling circuit 21 gathered, causes the erroneous judgement to the on off state of second contactor 102, improves the accuracy that judges the on off state detection of second contactor 102, and the adhesion detection circuitry of contactor still includes: a switching circuit 50, the switching circuit 50 comprising: a first switch 501 and a second switch 502, the adhesion detection circuit further includes: in the third sampling circuit 22, the first switch 501 and the second switch 502 control the on/off of the sampling loops of the first voltage sampling circuit 20 and the second voltage sampling circuit 21, and the first switch 501 and the second switch 502 control the on/off of the sampling loops of the first voltage sampling circuit 20 and the second voltage sampling circuit 21 according to the switching states of the first contactor 101 and the second contactor 102, so that the safety is improved.
Furthermore, the embodiment of the utility model provides a still provide a vehicle-mounted contactor that fills soon, vehicle-mounted contactor that fills soon contains as the above adhesion detection circuitry of contactor.
Because this vehicle-mounted fill contactor soon has adopted all technical scheme of above-mentioned all embodiments, consequently have at least all beneficial effects that technical scheme of above-mentioned embodiment brought, no longer repeated here.
Furthermore, the embodiment of the utility model provides a still provide a battery car, battery car contains as above on-vehicle fill contactor soon.
Since the battery car adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in the specific application, those skilled in the art can set the solution as required, and the present invention is not limited thereto.
It should be noted that the above-described working procedure is only illustrative and does not limit the scope of the present invention. In practical applications, a person skilled in the art may select some or all of them according to actual needs to implement the purpose of the solution of the embodiment, and is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the adhesion detection circuit of the contactor provided by any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, an arrangement, an article, or a system that comprises a list of elements does not include only those elements but also other elements not expressly listed or inherent to such process, arrangement, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, scheme, article or system that comprises the element.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. An adhesion detection circuit of a contactor, the contactor comprising: a first contactor and a second contactor; the first end of the first contactor is connected with the positive power supply input end; the first end of the second contactor is connected with the negative power supply input end;
the adhesion detection circuit includes: the sampling circuit comprises a first sampling circuit, a second sampling circuit, a current guide circuit and a controller; the first sampling end of the first sampling circuit and the first sampling end of the second sampling circuit are arranged between the first end of the first contactor and the positive power supply input end, the second sampling end of the first sampling circuit is arranged between the first end of the second contactor and the negative power supply input end, and the second sampling end of the second sampling circuit is connected with the second end of the second contactor; the input end of the drainage circuit is connected with the input end of the positive power supply, the output end of the drainage circuit is connected with the input end of the negative power supply, and the controller is respectively connected with the output end of the first sampling circuit and the output end of the second sampling circuit;
the first sampling circuit is used for collecting a first voltage;
the second sampling circuit is used for collecting a second voltage;
the controller is used for determining the switch state of the second contactor according to the first voltage and the second voltage.
2. The adhesion detection circuit of a contactor as claimed in claim 1, wherein the current guiding circuit comprises: a resistance;
the first end of the resistor is connected with the positive power supply input end, and the second end of the resistor is connected with the negative power supply input end.
3. The contact stick detection circuit of claim 1, further comprising: the switching circuit is arranged on the sampling loops of the first sampling circuit and the second sampling circuit;
the switch circuit is used for switching on or off the sampling loop.
4. The contactor stick detection circuit of claim 3, wherein the switching circuit comprises: a first switch;
the first end of the first switch is arranged between the first end of the first contactor and the positive power input end, and the second end of the first switch is connected with the first sampling end of the first sampling circuit and the first sampling end of the second sampling circuit respectively.
5. The adhesion detection circuit of a contactor as claimed in claim 4, wherein said switching circuit further comprises: a second switch;
the first end of the second switch is connected with the second sampling end of the first sampling circuit, and the second end of the second switch is respectively connected with the first end of the second contactor and the negative power supply input end.
6. The contact stick detection circuit of claim 5, wherein the first switch and the second switch are both in an open state when both the first contact and the second contact are in an open state.
7. The sticking detection circuit of a contactor as claimed in claim 5, wherein said first switch and said second switch are relay switches.
8. The contactor adhesion detection circuit according to any of claims 1-6, further comprising: a third sampling circuit; the first sampling end of the third sampling circuit is connected with the second end of the first contactor, the second sampling end of the third sampling circuit is connected with the second end of the second contactor, and the output end of the third sampling circuit is connected with the controller;
the third sampling circuit is used for collecting a third voltage;
the controller is further configured to determine a switching state of the first contactor according to the second voltage and the third voltage.
9. A vehicle rapid-charging contactor, characterized in that it comprises a contactor and an adhesion detection circuit of a contactor according to any of claims 1-8.
10. A battery car characterized in that the battery car comprises the vehicle-mounted quick-charging contactor according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123448798.0U CN216848061U (en) | 2021-12-31 | 2021-12-31 | Adhesion detection circuit of contactor, vehicle-mounted quick-charging contactor and battery car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123448798.0U CN216848061U (en) | 2021-12-31 | 2021-12-31 | Adhesion detection circuit of contactor, vehicle-mounted quick-charging contactor and battery car |
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| CN216848061U true CN216848061U (en) | 2022-06-28 |
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| CN202123448798.0U Active CN216848061U (en) | 2021-12-31 | 2021-12-31 | Adhesion detection circuit of contactor, vehicle-mounted quick-charging contactor and battery car |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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2021
- 2021-12-31 CN CN202123448798.0U patent/CN216848061U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
| CN115963393B (en) * | 2022-12-28 | 2024-01-05 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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Effective date of registration: 20230625 Address after: Room 1801, 1901, Unit 1, Huichuan Technology Headquarters Building, No. 6 Lanqing 2nd Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen, Guangdong 518000 Patentee after: Huichuan New Energy Vehicle Technology (Shenzhen) Co.,Ltd. Address before: 518000 Huichuan technology headquarters building, high tech Industrial Park, Guanlan street, Longhua District, Shenzhen, Guangdong Province Patentee before: SHENZHEN INOVANCE TECHNOLOGY Co.,Ltd. |