CN216886334U - Three-phase alternating-current charging pile - Google Patents
Three-phase alternating-current charging pile Download PDFInfo
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- CN216886334U CN216886334U CN202220205888.2U CN202220205888U CN216886334U CN 216886334 U CN216886334 U CN 216886334U CN 202220205888 U CN202220205888 U CN 202220205888U CN 216886334 U CN216886334 U CN 216886334U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The application provides a three-phase alternating-current charging stake. The three-phase AC charging pile has a first end for a power supply to receive a three-phase input and a second end connected to a vehicle to be charged through a charging gun; a first wire L1, a second wire L2, a third wire L3 and a fourth wire N between the first end and the second end and connected to the matching terminals of the first end and the second end, respectively; the main switch is electrically connected with the control module, the main switch is closed to enable the first end and the second end to be electrically connected, and the main switch is opened to enable the first end and the second end to be electrically disconnected; the short circuit detection circuit is provided with a detection switch, a voltage division unit and a detection circuit, wherein a signal input end of the detection switch is electrically connected to the second end, a signal output end of the detection switch is connected to the voltage division unit, the detection circuit is electrically connected with the voltage division unit and feeds detection information back to the control module, and the control module judges whether an output short circuit occurs or not based on the received detection information.
Description
Technical Field
The application relates to a charging source for an electric automobile, in particular to a three-phase alternating-current charging pile.
Background
Along with the popularization of electric vehicles, the charging piles matched with the electric vehicles are widely installed. The charging pile can be divided into a direct current charging pile and an alternating current charging pile according to types. Wherein, the share that three-phase alternating-current charging stake occupied is the highest. The output voltage of the existing three-phase alternating current charging pile is controlled by a main switch S1 inside the charging pile, the main switch S1 is closed, the charging pile outputs outwards, the main switch S1 is disconnected, and the charging pile outputs the disconnected state. Present three-phase alternating-current charging stake does not have output short circuit detection function, if there is the short circuit phenomenon in car end alternating current interface, when filling electric pile main switch and closing, will produce very big short circuit current, causes main switch S1 to glue even, if fills electric pile input side distribution protection improper, causes the conflagration hidden danger even.
For this purpose, existing alternating current charging piles need to be improved.
SUMMERY OF THE UTILITY MODEL
In view of the above, the object of the present application is to solve at least one of the technical drawbacks. A three-phase AC charging pile is provided, which has an output short circuit judging function. In order to achieve the purpose, the following technical scheme is adopted in the application:
a three-phase AC charging pile is characterized by comprising:
a first terminal for connection to a power source to receive an input of three-phase power,
a second end for connecting a vehicle to be charged through a charging gun;
a first wire L1, a second wire L2, a third wire L3 and a fourth wire N between the first end and the second end, and respectively connected to the matching terminal of the first end and the matching terminal of the second end;
the main switch is electrically connected with the control module, the main switch is closed to enable the first end and the second end to be electrically connected, and the main switch is opened to enable the first end and the second end to be electrically disconnected;
a short circuit detection circuit having a detection switch, a voltage division unit and a detection circuit,
the signal input end of the detection switch is electrically connected to the second end, the signal output end of the detection switch is connected to the voltage division unit,
the detection circuit is electrically connected with the voltage division unit and feeds detection information back to the control module, and the control module judges whether an output short circuit occurs or not based on the received detection information.
Preferably, the detection switch has:
a first signal input terminal connected to the first conductive line through a conductive line,
a second signal input terminal connected to the second conductive line through a conductive line,
a third signal input terminal connected to a third conductive line through a conductive line,
a first signal output terminal electrically connected to the first sampling point of the voltage divider unit through a wire,
a second signal output terminal electrically connected to the second sampling point of the voltage dividing unit through a wire,
and the third signal output end is electrically connected with the third sampling point of the voltage division unit through a lead.
And the fourth sampling point and the reference point of the voltage division unit are respectively connected to the detection circuit.
Preferably, the voltage dividing unit includes: a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 which are connected in series in sequence, wherein,
a first terminal of the first resistor R1 is connected to the first sampling point and Vdc,
the second terminal of the first resistor R1 is connected to the second sampling point and the first terminal of the second resistor R2,
the second end of the second resistor R2 is connected to the third sampling point and the first end of the third resistor R3,
the second terminal of the third resistor R3 is connected to the fourth sampling point and the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 is electrically grounded.
Preferably, each of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 includes at least one resistor.
Preferably, the detection switch comprises 3 independent switches or is a combination switch.
Preferably, the detection circuit includes a comparator that outputs a high/low level to the control module based on the detected information, and the control module determines whether a short circuit occurs based on the received high/low level information.
Preferably, the detection circuit includes an analog circuit for sampling the voltage information of the voltage dividing unit and feeding the voltage information back to the control module.
Preferably, the resistances of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are the same or different.
Preferably, the detection switch has:
a fourth signal input terminal connected to the fourth conductive line through a conductive line,
a fourth signal output end electrically connected to the fourth sampling point of the voltage dividing unit through a wire,
and a fourth sampling point and a reference point of the voltage division unit are respectively connected to the detection circuit.
The embodiment of the application provides a method for judging an output short circuit of the three-phase alternating-current charging pile, which is characterized by comprising the following steps of:
s1, the control module obtains the first preset signal, and based on the first preset signal, when the charging gun is judged to be correctly connected to the vehicle to be charged, the control module sends a second preset signal to the detection switch, the detection switch receives and closes corresponding to the second preset signal,
s2, the control module receives the third preset signal fed back by the detection circuit, compares the third preset signal with a preset threshold value to judge whether the output is short-circuited,
if the third preset signal exceeds the set range, judging that an output short circuit occurs, and not outputting the signal at the moment;
if the third preset signal does not exceed the set range, judging that no output short circuit occurs, sending a fourth preset signal to the main switch, receiving and responding to the fourth preset signal to close the main switch, and outputting the three-phase alternating-current charging pile to the outside so as to charge the connected vehicle.
Preferably, in step S2, the third preset signal is a high level or low voltage signal or a read voltage value, and whether a short circuit occurs is determined based on the third preset signal.
Compared with the scheme in the prior art, the method has the advantages that:
the three-phase alternating-current charging pile provided by the embodiment of the application detects whether the alternating-current charging interface of the vehicle end is short-circuited or not when the electric automobile is to be charged, and does not charge the charging pile (does not output the charging pile) if the short-circuit phenomenon of the vehicle end is detected; and equipment and power grid faults are greatly reduced.
Drawings
The present application is further described with reference to the following figures and examples:
fig. 1 is a schematic diagram of a topology module of a conventional three-phase ac charging pile;
fig. 2 is a schematic diagram of a topology module of a three-phase ac charging pile according to an embodiment of the present application;
FIG. 3 is a schematic topology diagram of a detection circuit according to an embodiment of the present application;
FIG. 4 is a schematic topology diagram of a detection circuit according to another embodiment of the present application;
fig. 5 is a schematic topology diagram of a three-phase ac charging pile according to another embodiment of the present application.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are typically those used in routine experimentation.
The application provides a three-phase alternating-current charging pile and an output short circuit judgment method. The three-phase AC charging pile has a first end for a power supply to receive a three-phase input and a second end connected to a vehicle to be charged through a charging gun; a first wire, a second wire, a third wire and a fourth wire which are arranged between the first end and the second end and are respectively connected to the matching terminals of the first end and the second end; the main switch is electrically connected with the control module, the main switch is closed to enable the first end and the second end to be electrically connected, and the main switch is opened to enable the first end and the second end to be electrically disconnected; the short circuit detection circuit is provided with a detection switch, a voltage division unit and a detection circuit, wherein a signal input end of the detection switch is electrically connected to the second end, a signal output end of the detection switch is connected to the voltage division unit, the detection circuit is electrically connected with the voltage division unit and feeds detection information back to the control module, and the control module judges whether an output short circuit occurs or not based on the received detection information.
The three-phase ac charging post proposed in the present application is described next with reference to fig. 2 to 4.
This three-phase alternating-current charging stake has: a first terminal IN (input terminal) for a power supply to receive a three-phase input, a second terminal OUT (output terminal) connected by a cable to a charging gun for connecting a vehicle to be charged,
the first wire L1, the second wire L2, the third wire L3 and the fourth wire N have one side connected to the matching terminal of the first end and the other side connected to the matching terminal of the second end.
A main switch S11 disposed on the first wire L1, the second wire L2, the third wire L3 and the fourth wire N, wherein the main switch S11 is closed to electrically connect the first end and the second end, and the main switch S11 is opened to electrically disconnect the first end and the second end. This main switch S11 has the trigger end, and its electric connection control module (be MCU controller) to and output short circuit detection circuit, this circuit includes:
a detection switch S12 having:
a first signal input terminal connected to the first conductive line through a conductive line,
a second signal input terminal connected to the second conductive line through a conductive line,
a third signal input terminal connected to a third conductive line through a conductive line,
a first signal output terminal electrically connected to the first sampling point of the voltage dividing unit through a wire,
a second signal output terminal electrically connected to the second sampling point of the voltage dividing unit through a wire,
and the third signal output end is electrically connected with the third sampling point of the voltage division unit through a lead.
The fourth sampling point and the reference point (grounding point) of the voltage division unit are connected to the detection circuit respectively,
the detection circuit is provided with a reference signal end which is electrically connected to the control module.
In this embodiment, the voltage dividing unit includes: a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 which are connected in series in sequence, wherein,
a first terminal of the first resistor R1 is connected to the first sampling point and Vdc,
the second terminal of the first resistor R1 is connected to the second sampling point and the first terminal of the second resistor R2,
the second terminal of the second resistor R2 is connected to the third sampling point and the first terminal of the third resistor R3,
the second end of the third resistor R3 is connected to the fourth sampling point, the first end of the fourth resistor R4 and the fourth conducting wire N (and the fourth sampling point is electrically connected to the second end), and the second end of the fourth resistor R4 is electrically grounded. In this embodiment, the first signal input terminal, the second signal input terminal, and the third signal input terminal are electrically connected to the second terminal. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are equivalent resistors, and may be 1 or more (for example, the first resistor R2 is formed by combining 2 resistors in series/parallel, and so on, the second resistor R2, the third resistor R3, and the fourth resistor R4). In this embodiment, the first terminal (input terminal) and the second terminal (output terminal) are respectively provided with 4 terminals to match with 4 wires. In other embodiments, 5 terminals are respectively disposed at the first terminal (input terminal) and the second terminal (output terminal) (one of the terminals is used as a redundant terminal, and when one terminal is damaged, the redundant terminal is used as a spare terminal).
When the three-phase alternating current charging pile is used for charging, the charging gun is inserted into an alternating current charging port of a vehicle to be charged, the control module detects a gun inserting signal of the charging gun, the charging gun is indicated to be correctly connected,
the detection switch S12, which controls its connection, is closed and the feedback signal is read by the detection circuit:
a) when the feedback signal exceeds the set range, the charging pile considers that the output is short-circuited and does not charge;
b) when the feedback signal is in the set range, the charging pile outputs short circuit detection, S2 is disconnected, the main switch S1 connected with the charging pile is controlled to be closed, and the three-phase alternating current charging pile starts to be charged.
In the present embodiment, the detection switch S12 may be 3 independent switches or may be a combination switch.
The mechanism of short circuit detection in this embodiment,
when the output is not short-circuited, the voltage division between the two ends of the fourth resistor R4 is V1,
v1 ═ Vdc × R4/(R1+ R2+ R3+ R4), set to Vref;
if a short circuit occurs between the first output lead L1 and the second output lead L2, the first resistor R1 is short-circuited, and the voltage division V1 across the fourth resistor R4 is Vdc × R4/(R2+ R3+ R4);
similarly, if a short circuit occurs between the first output lead L1 and the third output lead L3, the first resistor R1 and the second resistor R2 are short-circuited, and the voltage division V1 across the fourth resistor R4 is Vdc × R4/(R3+ R4);
similarly, when a short circuit occurs between the first output wire L1 and the fourth output wire N, the first resistor R1, the second resistor R2 and the third resistor R3 are shorted, and the voltage division V1 across the fourth resistor R4 is Vdc. By analogy, instead of enumeration, when a short circuit occurs in the output, the voltage V1 across the fourth resistor R4 is significantly higher than the set value (Vref). Whether the alternating current charging port is short-circuited or not is judged by detecting the voltage value of the two ends of the fourth resistor R4.
In one embodiment, the detection circuit includes a comparator that outputs a high/low level to the control module (i.e., the MCU controller) based on the detected information, and the control module determines whether a short circuit occurs (at the ac charging port) based on the received information (high/low level), as shown in fig. 3. At this time, a reference voltage Vset is preset for a hardware implementation of the detection circuit. The reference voltage Vset should be slightly larger than Vref and should be smaller than V1 voltage after any two phases of L1, L2, L3 and N are short-circuited. In the self-checking process, when the output has a short circuit, the voltage of V1 is greater than Vset, the comparator U1 outputs a high level, the high level is processed by the digital signal processing module and then is sent to the control module (MCU controller), and when the MCU controller detects the high level, the output short circuit is identified.
In one embodiment, as shown in fig. 4, the detection circuit includes an analog signal processing module (i.e., an analog circuit) for sampling the voltage information at the two ends of the fourth resistor R4 and feeding the voltage information back to the control module, and the control module (MCU controller) determines (calculates) whether a short circuit occurs according to the read voltage value of V1; when the reading voltage is obviously deviated from Vref, the output (AC charging port) is judged to have a short circuit. Further, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 may be set to different values, so that it can be identified which phase has a short circuit based on the detected V1 voltage.
As a modification of the embodiment of fig. 2, the detection switch S22 shown in fig. 5 includes:
a first signal input terminal connected to the first conductive line through a conductive line,
a second signal input terminal connected to the second conductive line through a conductive line,
a third signal input terminal connected to a third conductive line through a conductive line,
a fourth signal input terminal connected to the fourth conductive line through a conductive line,
a first signal output terminal electrically connected to the first sampling point of the voltage divider unit through a wire,
a second signal output terminal electrically connected to the second sampling point of the voltage dividing unit through a wire,
a third signal output end electrically connected to the third sampling point of the voltage dividing unit through a wire,
and the fourth signal output end is electrically connected with the fourth sampling point of the voltage division unit through a lead.
The fourth sampling point and the reference point (grounding point) of the voltage division unit are connected to the detection circuit respectively,
the detection circuit is provided with a reference signal end which is electrically connected to the control module. The detection mechanism of this circuit is similar to the scheme in fig. 2 and will not be repeated here.
The embodiment of the application provides a method for judging an output short circuit of a three-phase alternating-current charging pile, which comprises the following steps:
s1, a control module obtains a first preset signal, and sends a second preset signal to a detection switch when judging that a charging gun is correctly connected with a vehicle to be charged based on the first preset signal, the detection switch receives and closes corresponding to the second preset signal,
s2, the control module receives the third preset signal fed back by the detection circuit, compares the third preset signal with a preset threshold value to judge whether the output is short-circuited,
if the third preset signal exceeds the set range, judging that an output short circuit occurs, and not outputting the signal at the moment;
if the third preset signal does not exceed the set range, judging that no output short circuit occurs, sending a fourth preset signal to the main switch, receiving and responding to the fourth preset signal to close the main switch, and outputting the three-phase alternating-current charging pile to the outside so as to charge the connected vehicle. Through the design, whether the short circuit exists in the alternating current charging interface of the vehicle end is detected, and if the short circuit phenomenon exists in the vehicle end, the charging pile is not charged (the output is not performed); and equipment and power grid faults are greatly reduced.
In one embodiment, the third predetermined signal is a high level or a low voltage signal, and the control module determines whether the ac charging port is shorted based on the received high/low level. The judgment mechanism is to preset a reference voltage Vset in hardware implementation. The reference voltage Vset should be slightly larger than Vref and should be smaller than V1 voltage after any two phases of L1, L2, L3 and N are short-circuited. In the self-checking process, when the output has a short circuit, the voltage of V1 is greater than Vset, the comparator U1 outputs a high level, the high level is processed by a digital signal and is sent to the MCU, and when the MCU detects the high level, the output short circuit is identified.
In one embodiment, the third preset signal is a read voltage value across the fourth resistor, and whether a short circuit occurs is determined (calculated) based on the voltage value; when the reading voltage is obviously deviated from Vref, the output (AC charging port) is judged to have a short circuit. Further, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 may be set to different values, so that the position of the short circuit can be accurately identified based on the detected voltage value.
The above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the embodiments is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application are intended to be covered by the scope of the present application.
Claims (8)
1. A three-phase AC charging pile is characterized by comprising:
a first terminal for a power source to receive a three-phase input,
a second end for connecting a vehicle to be charged through a charging gun;
a first wire L1, a second wire L2, a third wire L3 and a fourth wire N between the first end and the second end, and respectively connected to the matching terminal of the first end and the matching terminal of the second end;
the main switch is electrically connected with the control module, the main switch is closed to enable the first end and the second end to be electrically connected, and the main switch is opened to enable the first end and the second end to be electrically disconnected;
a short circuit detection circuit having a detection switch, a voltage division unit and a detection circuit,
the signal input end of the detection switch is electrically connected to the second end, the signal output end of the detection switch is connected to the voltage division unit,
the detection circuit is electrically connected with the voltage division unit and feeds detection information back to the control module, and the control module judges whether an output short circuit occurs or not based on the received detection information.
2. The three-phase AC charging post of claim 1,
the detection switch has:
a first signal input terminal connected to the first conductive line through a conductive line,
a second signal input terminal connected to the second conductive line through a conductive line,
a third signal input terminal connected to a third conductive line through a conductive line,
a first signal output terminal electrically connected to the first sampling point of the voltage dividing unit through a wire,
a second signal output terminal electrically connected to the second sampling point of the voltage divider unit through a wire,
a third signal output end electrically connected to the third sampling point of the voltage dividing unit through a wire,
and a fourth sampling point and a reference point of the voltage division unit are respectively connected to the detection circuit.
3. The three-phase AC charging post according to claim 2,
the voltage dividing unit includes: a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 which are connected in series in sequence, wherein,
a first terminal of the first resistor R1 is connected to the first sampling point and Vdc,
the second terminal of the first resistor R1 is connected to the second sampling point and the first terminal of the second resistor R2,
the second terminal of the second resistor R2 is connected to the third sampling point and the first terminal of the third resistor R3,
the second terminal of the third resistor R3 is connected to the fourth sampling point and the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 is electrically grounded.
4. The three-phase AC charging post according to claim 3,
the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 respectively comprise at least one resistor.
5. The three-phase AC charging post according to claim 3,
the detection switch comprises 3 independent switches or is a combined switch.
6. The three-phase AC charging post according to claim 2,
the detection switch has:
a fourth signal input terminal connected to the fourth conductive line through a conductive line,
a fourth signal output end electrically connected to the fourth sampling point of the voltage dividing unit through a wire,
and the fourth sampling point and the reference point of the voltage division unit are respectively connected to the detection circuit.
7. The three-phase AC charging post of claim 1,
the detection circuit includes a comparator that outputs a high/low level to a control module based on detected information, and the control module determines whether a short circuit occurs based on received high/low level information.
8. The three-phase AC charging post according to claim 1,
the detection circuit comprises an analog circuit which is used for sampling the voltage information of the voltage division unit and feeding the voltage information back to the control module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220205888.2U CN216886334U (en) | 2022-01-25 | 2022-01-25 | Three-phase alternating-current charging pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220205888.2U CN216886334U (en) | 2022-01-25 | 2022-01-25 | Three-phase alternating-current charging pile |
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| CN216886334U true CN216886334U (en) | 2022-07-05 |
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