Alternating current charging pile charging socket short circuit detection circuit and detection method thereof

Abstract

The present application relates to the technical field of short circuit detection, and provides an alternating current charging pile charging socket short circuit detection circuit and a detection method thereof. The alternating current charging pile charging socket short circuit detection circuit comprises: a charging circuit connected to a power frequency alternating current power supply, wherein the charging circuit comprises an alternating current energy metering circuit, a relay and a power socket connected in series; a detection circuit connected in parallel to both ends of the relay; and a control circuit connected to the alternating current energy metering circuit and the relay respectively. The alternating current charging pile charging socket short circuit detection circuit provided by the present application fundamentally avoids the charging pile failure caused by the load short circuit of the power socket, and reduces the operation and maintenance cost of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of short circuit detection, in particular to an alternating current charging pile charging socket short circuit detection circuit and a detection method thereof. BACKGROUND

[0002] The alternating current charging pile of the electric bicycle can provide 220V power frequency alternating current to the electric bicycle of the user for charging. When the user pays successfully, the 220V power frequency alternating current is connected to the charging socket selected by the user.

[0003] Since the alternating current charging pile is located in an unattended place, if the electric bicycle charger of the user has a short circuit fault, an overload large current will occur in the charging socket of the alternating current charging pile. Even if the air switch, fuse and other protection circuits of the device have overload protection, the charging socket, relay and other devices inside the alternating current charging pile will still be damaged. In addition, the air switch of the 220V alternating current main power supply will be disconnected due to overcurrent, which increases the workload of the maintenance personnel on site service and is not conducive to reducing the product maintenance cost.

[0004] There are many ways for short circuit detection in the prior art. The patent applications with publication numbers CN 107482916 A, CN 105978340 A and CN 103260323 A give a technical solution for short circuit protection after a large current exists in the load current loop. This short circuit protection is simple, reliable and can meet the use requirements of most occasions.

[0005] However, the alternating current charging pile of the electric bicycle belongs to an unattended working mode, and there is no one on site to maintain in time. If the air switch of the 220V alternating current main power supply is disconnected due to overcurrent, the operation and maintenance cost of the product will be greatly increased. SUMMARY

[0006] The present application provides an alternating current charging pile charging socket short circuit detection circuit and a detection method thereof, which can effectively determine whether the load of the power supply socket has a short circuit abnormal condition and reduce the operation and maintenance cost.

[0007] The present application provides an alternating current charging pile charging socket short circuit detection circuit, which comprises:

[0008] A charging circuit connected to a power frequency alternating current power supply, the charging circuit comprising an alternating current energy metering circuit, a relay and a power socket connected in series, the alternating current energy metering circuit being used to measure the power factor of the charging circuit, the relay being used to disconnect the charging circuit, and the power socket being used to connect a charger.

[0009] A detection circuit, wherein the detection circuit is connected in parallel to both ends of the relay;

[0010] A control circuit is provided, which is connected to the AC energy metering circuit and the relay respectively. The control circuit is used to control the opening and closing of the relay according to the measurement results of the AC energy metering circuit.

[0011] According to the present invention, a short circuit detection circuit for an AC charging pile charging socket is provided, wherein the detection circuit includes a capacitor and a first resistor connected in series.

[0012] According to the present invention, a short circuit detection circuit for an AC charging pile charging socket is provided, wherein the detection circuit further includes a control switch connected in series with the capacitor and the first resistor, and the control switch is used to disconnect the detection circuit.

[0013] The AC charging pile charging socket short circuit detection circuit provided by the present invention further includes a charge release circuit, which is connected in parallel across the two ends of the capacitor.

[0014] According to the present invention, a short circuit detection circuit for an AC charging pile charging socket is provided, wherein the charge release circuit includes a plurality of second resistors connected in series.

[0015] According to the present invention, in an AC charging pile charging socket short circuit detection circuit, the number of the second resistors is three.

[0016] The present invention also provides a detection method based on the short circuit detection circuit of the AC charging pile charging socket described above, comprising:

[0017] Obtain the power factor measured by the AC energy metering circuit;

[0018] Determine whether the charger has a short circuit fault based on the power factor described above;

[0019] In the event of a short circuit fault in the charger, the relay is kept open; in the event of no short circuit fault in the charger, the relay is turned on to charge the charger.

[0020] According to the present invention, a method for detecting a short circuit in an AC charging pile charging socket is provided, wherein the step of determining whether the charger has a short circuit fault based on the power factor includes:

[0021] If the power factor value is less than or equal to 0.08, the charger is determined to have a short circuit fault.

[0022] If the power factor value is greater than 0.08, it is determined that the charger has not experienced a short circuit fault.

[0023] According to the AC charging pile charging socket short circuit detection circuit detection method provided by the application, before the step of obtaining the power factor measured by the AC energy metering circuit, the method comprises the following steps:

[0024] Obtaining payment information;

[0025] After the payment information is payment success, the detection loop is turned on to obtain the power factor measured by the AC energy metering circuit.

[0026] According to the AC charging pile charging socket short circuit detection circuit detection method provided by the application, after the step of judging whether the charger has a short circuit fault according to the power factor, the method further comprises the following steps:

[0027] In the case that the charger has a short circuit fault, prompting the user that the charger has a short circuit fault;

[0028] In the case that the charger does not have a short circuit fault, prompting the user that the charger is charging.

[0029] The AC charging pile charging socket short circuit detection circuit and the detection method thereof provided by the application can measure the power factor of the detection loop through the AC energy metering circuit before the relay turns on the charging loop, so as to judge whether the charger connected to the power socket has a short circuit fault, and then control the relay through the control circuit to realize the control of the opening of the charging loop. Therefore, the load of the power socket can be accurately and effectively detected before the working current is generated. Compared with the existing short circuit detection method and device, the AC charging pile charging socket short circuit detection circuit provided by the application fundamentally avoids the charging pile fault caused by the short circuit of the load of the power socket. Therefore, the charging pile does not need to be frequently maintained, and the operation and maintenance cost of the product is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is one of the schematic diagrams of the AC charging pile charging socket short circuit detection circuit provided by the application;

[0032] Figure 2 is the second schematic diagram of the AC charging pile charging socket short circuit detection circuit provided by the application;

[0033] Figure 3Fig. 3 is a schematic view of the third AC charging pile charging socket short circuit detection circuit provided by the present application;

[0034] Figure 4 Fig. 4 is a schematic view of an AC energy metering circuit of the AC charging pile charging socket short circuit detection circuit provided by an embodiment of the present application;

[0035] Reference signs:

[0036] 10: AC energy metering circuit;

[0037] 20: relay;

[0038] 30: power socket;

[0039] 40: control circuit;

[0040] 51: capacitor;

[0041] 52: first resistor;

[0042] 53: control switch;

[0043] 54: second resistor. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The AC charging pile charging socket short circuit detection circuit provided by the present application is used for the AC charging pile of an electric bicycle, of course, according to the needs, it can also be used in the charging pile of an electric vehicle, etc., to realize short circuit detection, which will not be described here.

[0047] The AC charging pile charging socket short circuit detection circuit and the detection method thereof of the present application will be described below in conjunction with Figures 1-4

[0048] Please refer to​Figure 1 In the embodiment of the present application, the alternating current charging pile charging socket short circuit detection circuit comprises:

[0049] A charging circuit is connected to the power frequency alternating current power supply, and the charging circuit comprises an alternating current energy metering circuit 10, a relay 20 and a power socket 30 connected in series, the alternating current energy metering circuit 10 is used for measuring the power factor of the charging circuit, the relay 20 is used for breaking the charging circuit, and the power socket 30 is used for connecting the charger;

[0050] A detection circuit is connected to both ends of the relay 20;

[0051] A control circuit 40 is connected to the alternating current energy metering circuit 10 and the relay 20 respectively, and the control circuit 40 is used for controlling the breaking of the relay 20 according to the measurement result of the alternating current energy metering circuit 10.

[0052] In the above circuit structure, the alternating current energy metering circuit 10 has been used in the charging pile, Figure 4 It is a structural schematic diagram of an existing alternating current metering circuit, which can accurately measure active power, reactive power, power factor and other parameters in addition to measuring active electric energy, after the charger is connected to the power socket 30, the relay 20 is turned on, and the charger can be charged by the power frequency alternating current power supply, and the power frequency alternating current power supply is a 220V power frequency alternating current power supply.

[0053] The detection circuit is connected to both ends of the relay 20, and the charger connected to the power socket 30 can be short circuit detected before the relay 20 is turned on, so that whether the charger has a short circuit fault can be measured before the working current is generated.

[0054] The control circuit 40 is used for receiving the measurement information of the alternating current energy metering circuit 10, so as to control the power supply of the power socket 30 according to the measurement information.

[0055] In the embodiment, before the relay 20 turns on the charging circuit, the power factor of the detection circuit can be measured by the alternating current energy metering circuit 10 to determine whether the charger connected to the power socket 30 has a short circuit fault, and then the relay 20 is controlled by the control circuit 40 to control the breaking of the charging circuit, so that whether the load of the power socket 30 has a short circuit can be accurately and effectively detected before the working current is generated. Compared with the existing short circuit detection method and device, the alternating current charging pile charging socket short circuit detection circuit provided by the present application fundamentally avoids the charging pile failure caused by the short circuit of the load of the power socket 30, so that the charging pile does not need to be maintained frequently, and the operation and maintenance cost of the product is reduced.

[0056] Please refer to Figure 1 In the embodiment of the present application, the detection circuit comprises a capacitor 51 and a first resistor 52 connected in series.

[0057] The capacitor 51 is used for short circuit detection, and the first resistor 52 is used for inhibiting the charging and discharging current of the capacitor 51. When the relay 20 is disconnected, the capacitor 51, the first resistor 52 and the power socket 30 form a series connection, and when connected to the power supply, the capacitive reactance of the capacitor 51, the resistance and the power socket 30 become a load. When the load of the power socket 30 tends to be short-circuited, the load of the detection circuit is capacitive, and the power factor of the load of the detection circuit is the characteristic of the reactive power, which is very low. The power factor measured by the AC power metering circuit is below 0.08. When the load of the power socket 30 is not short-circuited, the load of the detection circuit is the series connection of the capacitor 51 and the electric vehicle charger, and the power factor is about 0.5. The power factor is not affected by the external supply voltage and is suitable for 90V-260V AC power supply. In this way, the power factor measured by the AC power metering circuit can be used to determine whether the charger connected to the power socket 30 is short-circuited when the relay 20 is not turned on.

[0058] Please refer to Figure 2 Further, the detection circuit further comprises a control switch 53 connected in series with the capacitor 51 and the first resistor 52, and the control switch 53 is used to open and close the detection circuit.

[0059] In the charging circuit, the capacitor 51, the first resistor 52 and the control switch 53 are connected in series and then connected in parallel across the relay 20. When the control switch 53 is turned on, the detection circuit is turned on, and short circuit detection is realized.

[0060] When the relay 20 is disconnected, the capacitor 51, the first resistor 52, the control switch 53 and the power socket 30 are connected in series and connected to the power supply. When the control switch 53 is turned on, the short circuit detection of the charging socket is started. When the control switch 53 is turned off, the current of the short circuit detection circuit is cut off, the apparent power of the product during operation is reduced, and the requirement of energy saving is achieved.

[0061] Further, the control switch 53 is connected to the control circuit 40.

[0062] In this way, the opening and closing of the control switch 53 can be actively controlled by the control circuit 40 to reduce the requirement of energy saving. In the embodiment, after the user successfully pays, the control circuit 40 controls the control switch 53 to be turned on, and short circuit detection is first performed. Of course, in other embodiments, the opening and closing of the detection circuit can also be realized by manually operating the control switch 53, which will not be described in detail.

[0063] Please refer to Figure 3In an embodiment of the present application, a charge release circuit is further included, which is connected in parallel to both ends of the capacitor 51.

[0064] After the control switch 53 is turned off, the current of the detection circuit is cut off, and the charge of the capacitor 51 can be slowly discharged through the charge release circuit, so that the service life of the capacitor 51 is improved, and the operation and maintenance cost of the product is reduced.

[0065] Specifically, the charge release circuit includes a plurality of second resistors 54 connected in series. In the embodiment, the number of the second resistors 54 is three.

[0066] In this way, the charge of the capacitor 51 can be effectively and slowly released, and the operation and maintenance cost of the product is reduced.

[0067] In an embodiment, the parameter of the second resistor 54 is 1MΩ / 0.1W, the parameter of the first resistor 52 is 15Ω / 1W, the parameter of the capacitor 51 is 0.22uF / X2, and the control switch 53 is a solid-state relay 20 with the parameter of MOC3063XSM. Since the resistance of the charge release circuit is as high as 3MΩ, when the control switch 53 is turned on, the detection current can ignore the three resistors to achieve effective measurement.

[0068] In addition, the present application further provides a detection method based on the short circuit detection circuit of the alternating current charging pile charging socket, which comprises the following steps:

[0069] Obtaining the power factor measured by the alternating current energy metering circuit 10;

[0070] Determining whether the charger has a short circuit fault according to the power factor;

[0071] In the case that the charger has a short circuit fault, the relay 20 is controlled to remain open; in the case that the charger does not have a short circuit fault, the relay 20 is controlled to be turned on to charge the charger.

[0072] In this way, before the working current is generated, it can be accurately and effectively detected whether the load of the power socket 30 has a short circuit, and the power socket 30 that has a short circuit will not be supplied with alternating current power, so that there will be no overload current in the load circuit, thereby avoiding damage to the charging pile and reducing the operation and maintenance cost of the product.

[0073] Specifically, the step of determining whether the charger has a short circuit fault according to the power factor comprises:

[0074] In the case that the value of the power factor is less than or equal to 0.08, it is determined that the charger has a short circuit fault;

[0075] In the case that the value of the power factor is greater than 0.08, it is determined that the charger does not have a short circuit fault.

[0076] Here, according to the circuit structure of the specific detection circuit, the measured power factor value is different, which can be changed according to the specific situation, but the short circuit fault can still be judged by the large difference between the short circuit and the non-short circuit.

[0077] In addition, before the step of obtaining the power factor measured by the alternating energy metering circuit 10, it comprises:

[0078] Obtain payment information;

[0079] After the payment information is successful, the detection circuit is opened to obtain the power factor measured by the alternating energy metering circuit 10.

[0080] In actual use, after the user connects the charger to the power socket 30, the user needs to connect the control circuit 40 through the mobile device and pay for the charging function of the charging pile. The control circuit 40 obtains the payment information, and then controls the aforementioned control switch 53 to first open the detection circuit and perform short circuit detection on the charger. In this way, the current of the short circuit detection circuit can be cut off when not in use, reducing the apparent power of the product during operation and achieving the requirement of reducing energy.

[0081] And, after the step of judging whether the charger has a short circuit fault according to the power factor, it further comprises:

[0082] In the case that the charger has a short circuit fault, prompting the user that the charger has a short circuit fault;

[0083] In the case that the charger does not have a short circuit fault, prompting the user that the charger is charging.

[0084] In this embodiment, the mobile terminal connected to the control circuit 40 can inform the customer that the charger has a fault or is charging. In other embodiments, display devices can be used for display feedback reminders, or voice playback devices can be used for voice feedback reminders. In this way, after the charger has a short circuit fault, the user can be reminded that the charger has a fault and will not be provided with services to avoid charging pile faults.

[0085] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An alternating current charging station charging outlet short circuit detection circuit, characterized in that, include: A charging circuit is connected to an industrial frequency AC power supply. The charging circuit includes an AC energy metering circuit, a relay, and a power socket connected in series. The AC energy metering circuit is used to measure the power factor of the charging circuit. The relay is used to disconnect the charging circuit. The power socket is used to connect a charger. A detection circuit is connected in parallel across the two ends of the relay; the detection circuit includes a capacitor and a first resistor connected in series, and the detection circuit also includes a control switch connected in series with the capacitor and the first resistor, the control switch being used to turn the detection circuit on and off; A control circuit is provided, which is connected to the AC energy metering circuit and the relay respectively. The control circuit is used to obtain the power factor measured by the AC energy metering circuit when the relay is open and the control switch is on, and to determine that the charger has a short circuit fault when the power factor is less than or equal to 0.08, and to control the relay to remain open.

2. The alternating current charging station charging outlet short circuit detection circuit of claim 1, wherein, It also includes a charge release circuit, which is connected in parallel across the two ends of the capacitor.

3. The alternating current charging station charging outlet short circuit detection circuit of claim 2, wherein, The charge release circuit includes multiple second resistors connected in series.

4. The alternating current charging station charging outlet short circuit detection circuit of claim 3, wherein, The number of the second resistor is three.

5. A detection method for the short circuit detection circuit of an AC charging pile charging socket according to any one of claims 1 to 4, characterized in that, include: Obtain the power factor measured by the AC energy metering circuit; Determine whether the charger has a short circuit fault based on the power factor described above; In the event of a short circuit fault in the charger, the relay is kept open; in the event of no short circuit fault in the charger, the relay is turned on to charge the charger.

6. The method of claim 5, wherein, The step of determining whether the charger has a short circuit fault based on the power factor includes: If the power factor value is less than or equal to 0.08, the charger is determined to have a short circuit fault. If the power factor value is greater than 0.08, it is determined that the charger has not experienced a short circuit fault.

7. The method of claim 5, wherein the step of detecting is characterized by, Before the step of obtaining the power factor measured by the AC energy metering circuit, the following steps are included: Obtain payment information; After the payment information indicates successful payment, the detection circuit is activated to obtain the power factor measured by the AC energy metering circuit.

8. The method of claim 5, wherein the step of detecting is characterized by, After the step of determining whether the charger has a short circuit fault based on the power factor, the method further includes: In the event of a short circuit in the charger, the user will be notified that a short circuit has occurred in the charger. If the charger is not short-circuited, it will indicate to the user that the charger is charging.

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