CN220552952U - Relay detection device of charging pile and charging pile - Google Patents
Relay detection device of charging pile and charging pile Download PDFInfo
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Abstract
The application provides a fill electric pile's relay detection device and fill electric pile, wherein, the device includes exchanging input port, relay module, voltage and current sampling module, AC output port, metering unit, ground connection continuity detection module and processing module, wherein exchange input port, relay module, voltage and current sampling module, AC output port connect gradually, ground connection continuity detection module is used for gathering relay module input voltage and sends processing module, voltage and current sampling module sends the voltage and the electric current of relay module output for processing module through metering unit, processing module judges whether fill electric pile relay is normal according to the voltage of receiving. According to the method, the voltage of the output end of the relay module is detected through the metering module and the voltage and current sampling module, and the isolation sampling circuit is avoided, so that the circuit cost is reduced, and the accuracy of fault alarming is improved.
Description
Technical Field
The application relates to the technical field of relay detection, in particular to a relay detection device of a charging pile and the charging pile.
Background
With the importance of people on green travel, electric automobiles are becoming more popular, the number of charging piles is also increasing, and the safety problem of relays in the charging piles is attracting attention. Therefore, the charging stake needs to detect the relay in the charging stake periodically.
In the prior art, when the charging pile detects two relays of the charging pile, only one relay of the two relays is closed, an output voltage signal is converted into an optical coupler secondary side low-voltage output signal through an optical coupler isolation circuit, and whether the other relay is adhered or not is judged by the singlechip according to the optical coupler secondary side low-voltage output signal.
However, the scheme in the prior art has the problems of high hardware cost and complex circuit, and meanwhile, the phenomenon of optical coupling error conduction can occur when the Y capacitance is overlarge by adopting an optical coupling isolation mode, so that the detection result of the relay is affected.
Disclosure of Invention
An object of the present application is to provide a relay detection device of a charging pile and the charging pile, aiming at the defects in the prior art, so as to solve the problems of high hardware cost, complex circuit and low accuracy of a relay detection result in the prior art.
In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
in a first aspect, an embodiment of the present application provides a relay detection apparatus for a charging pile, the apparatus including: the device comprises an alternating current input port, a relay module, a voltage and current sampling module, an alternating current output port, a metering unit, a grounding continuity detection module and a processing module;
the input end of the relay module is connected with the alternating current input port, the output end of the relay module is connected with the input end of the voltage and current sampling module, the first output end of the voltage and current sampling module is connected with the alternating current output port, and the voltage and current sampling module is used for sampling the voltage and the current of the output end of the relay module;
the input end of the grounding continuity detection module is connected with the input end of the relay module, the output end of the grounding continuity detection module is connected with the first input end of the processing module, and the grounding continuity detection module is used for detecting the voltage of the input end of the relay module;
the input end of the metering unit is connected with the second output end of the voltage and current sampling module, the output end of the metering unit is connected with the second input end of the processing module, and the metering unit is used for converting the voltage and the current sampled by the voltage and current sampling module;
the processing module is used for detecting whether the relay module is normal or not according to the voltage of the input end of the relay module detected by the grounding continuity detection module and the voltage output by the metering unit.
Optionally, the relay module includes: a first relay and a second relay;
the live wire input end and the ground wire input end of the first relay are respectively connected to the live wire end and the ground wire end of the alternating current input port, and the output end of the first relay is connected with the input end of the voltage and current sampling module;
the zero line input end and the ground wire input end of the second relay are respectively connected to the zero line end and the ground wire end of the alternating current input port, and the output end of the second relay is connected with the input end of the voltage and current sampling module.
Optionally, the ground continuity detecting module includes a first ground continuity detecting unit and a second ground continuity detecting unit;
two input ends of the first grounding continuity detection unit are respectively connected with a live wire input end and a ground wire input end of the first relay;
two input ends of the second grounding continuity detection unit are respectively connected with a zero line input end and a ground wire input end of the second relay;
the output end of the first grounding continuity detecting unit and the output end of the second grounding continuity detecting unit are respectively connected with the first input end of the processing module.
Optionally, the first ground continuity detecting unit includes: the first resistor, the second resistor and the first operational amplifier;
one end of the first resistor is connected with the live wire input end of the first relay, and the other end of the first resistor is connected with the first input end of the first operational amplifier;
one end of the second resistor is connected with the ground wire input end of the first relay, and the other end of the second resistor is connected with the second input end of the first operational amplifier;
the output end of the first operational amplifier is connected with the first input end of the processing module.
Optionally, the second ground continuity detecting unit includes: the third resistor, the fourth resistor and the second operational amplifier;
one end of the third resistor is connected with the zero line input end of the second relay, and the other end of the third resistor is connected with the first input end of the second operational amplifier;
one end of the fourth resistor is connected with the ground wire input end of the second relay, and the other end of the fourth resistor is connected with the second input end of the second operational amplifier;
the output end of the second operational amplifier is connected with the first input end of the processing module.
Optionally, the apparatus further includes: a lightning protection module;
the input end of the lightning protection module is connected with the alternating current input port, and the output end of the lightning protection module is connected with the input end of the relay module.
Optionally, the apparatus further includes: the electric leakage detection module;
the input end of the electric leakage detection module is connected with the output end of the lightning protection module, the first output end of the electric leakage detection module is connected with the processing module, and the second output end of the electric leakage detection module is connected with the input end of the relay module.
Optionally, the output end of the processing module is connected with the control end of the relay module, and the processing module is further configured to send an on-off instruction to the relay module via the output end of the processing module and the control end of the relay module.
Optionally, the processing module is specifically configured to:
when the relay module is disconnected, if the voltage output by the metering unit is not 0, and the difference value between the voltage output by the metering unit when the relay module is disconnected and the voltage output by the grounding continuity detection module when the relay module is closed is smaller than a first preset threshold value, detecting that the relay module is abnormal;
when the relay module is closed, if the difference value between the voltage output by the metering unit and the voltage output by the grounding continuity detection module is larger than a second preset threshold value, abnormality of the relay module is detected.
In a second aspect, another embodiment of the present application provides a charging pile, including the relay detection device of the charging pile of the first aspect.
The beneficial effects of this application are: the relay detection device of the charging pile comprises an alternating current input port, a relay module, a voltage and current sampling module, an alternating current output port, a metering unit, a grounding continuity detection module and a processing module, wherein the alternating current input port, the relay module, the voltage and current sampling module and the alternating current output port are sequentially connected, the grounding continuity detection module is used for detecting the voltage of the input end of the relay module and sending the voltage to the processing module, the metering unit is used for sending the voltage and the current of the output end of the relay module sampled by the voltage and current sampling module to the processing module, and the processing module judges whether the relay module is normal or not by judging the voltage output by the grounding continuity detection module and the voltage of the output end of the relay module. Because the metering unit is at relay module's output for voltage and electric current of measuring relay module output, and not just be connected at relay module's input like among the prior art, only be used for measuring relay module input's voltage and electric current, if need judge whether relay module adhesion still need set up isolation sampling circuit, therefore the hardware that uses in this application is less, and the hardware cost is low, and the circuit is simple. In addition, the voltage and current sampling module and the metering unit are used, compared with an isolation sampling circuit which is not adopted in the prior art, the circuit reliability is improved, and false alarm faults are avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a relay detection device of a charging pile according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a relay module according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first relay according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a ground continuity detecting module according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a first ground continuity detecting unit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a second ground continuity detecting unit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another relay detection apparatus for a charging pile according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a relay detection device of a charging pile according to another embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not intended to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this application, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to the flow diagrams and one or more operations may be removed from the flow diagrams as directed by those skilled in the art.
In addition, the described embodiments are only some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the presence of the features stated hereinafter, but not to exclude the addition of other features.
In order to periodically detect the abnormal condition of the charging pile relay, in the prior art, the relay is often detected in the following three modes.
The first way is: when two relays in the charging pile are detected, only one relay is closed, an output voltage signal is converted into an optical coupling secondary side low-voltage output signal through an optical coupling isolation circuit, then the secondary side low-voltage output signal is transmitted to the singlechip, and the singlechip judges whether the other relay is adhered or not according to the received signal.
The second mode is as follows: different current signals can be output through the rectifying circuit according to the adhesion condition of the two relays, then the current signals are converted into voltage judgment signals through the optocoupler isolation circuit and are transmitted to the control unit, and the control unit judges whether the relays send adhesion or not. However, in this scheme, when one of the two relays is stuck, it cannot be identified which relay is stuck.
The third way is: the spectrum isolation circuit is used for detecting the partial pressure of the output voltage of the relay on the capacitor, so as to judge whether the relay is adhered or not. However, the method needs to detect the two relays respectively, uses more devices, has high hardware cost, needs a voltage sampling circuit to realize the voltage judgment of the sampling capacitor, and has more complicated hardware.
In practical application, when the Y capacitance at the interface of the electric automobile is too large, the three detection schemes are switched on by mistake in the optocoupler isolation circuit, so that false alarm faults are caused. Wherein the Y circuit is used to filter out common mode interference. Thus, the conventional scheme ignores the influence of the electric car end.
The utility model provides a based on above-mentioned problem, proposes a fill electric pile's relay detection device, and the device includes exchanging input port, relay module, voltage and current sampling module, exchanges output port, measurement unit, ground connection continuity detection module and processing module. The power circuit can be formed by the alternating current input port, the relay module, the voltage and current sampling module and the alternating current output port, the grounding continuity detection module can monitor the voltage of the input end of the relay module and input the voltage into the processing module, the voltage and current sampling module can input the voltage of the output end of the relay module into the processing module through the metering unit, and the processing module judges whether the relay module sends adhesion or failure according to the received voltage of the input end and the voltage of the output end of the relay module. Because the optocoupler isolation circuit is not used in the method, the phenomenon that detection is biased due to overlarge Y capacitance does not occur.
When a detector needs to detect the relay in the charging pile, the processing unit can be controlled to control the relay module, the voltage output by the grounding continuity detection module and the voltage output by the metering unit are collected so as to judge whether the relay module is adhered or failed, the judgment result is output to the detector, and the detector can overhaul the relay module through the judgment result.
Next, the structure of the relay detection apparatus of the charging pile will be described with reference to fig. 1. The relay detection device of the charging pile comprises an alternating current input port 10, a relay module 20, a voltage and current sampling module 30, an alternating current output port 40, a metering unit 50, a grounding continuity detection module 60 and a processing module 70.
Alternatively, the ac input port 10 may be connected to an ac power grid, so that the electric vehicle connected to the ac output port 40 is supplied with power through a module such as the relay module 20.
Alternatively, the relay module 20 may be connected in series with the live wire and the neutral wire, respectively, from the ac input port 10 to the live wire L, the ground wire PE, and the neutral wire N to the ac output port 40, and the voltage-current sampling module 30 may include a voltage sampling module connected in parallel with the live wire and the neutral wire, and a current sampling module connected in series with the live wire. The ground continuity detection module 60 may detect whether the hot and neutral wires are grounded, respectively, and may detect voltages on the hot and neutral wires, respectively. It is noted that the voltage on the live and neutral wires is added, i.e. the voltage at the input of the relay module 20.
Optionally, an input end of the relay module 20 is connected to the ac input port 10, an output end of the relay module 20 is connected to an input end of the voltage and current sampling module 30, a first output end of the voltage and current sampling module 30 is connected to the ac output port 40, and the voltage and current sampling module 30 is used for sampling the voltage and current of the output end of the relay module 20.
Optionally, the live wire of the ac input port 10 is led to the live wire end of the ac output port 40 through the relay module 20, and is used for charging the electric automobile through the live wire interface of the charging gun, and the zero wire of the ac input port 10 is led to the zero wire end of the ac output interface through the relay module 20, and is used for charging the electric automobile through the zero wire interface of the charging gun.
Optionally, an input end of the ground continuity detecting module 60 is connected to an input end of the relay module 20, an output end of the ground continuity detecting module 60 is connected to a first input end of the processing module 70, and the ground continuity detecting module 60 is configured to detect a voltage of the input end of the relay module 20.
Optionally, the ground continuity detection module 60 is configured to detect voltages on the hot and neutral wires at the input of the relay module 20 and send the detected voltages to the processing module 70.
Optionally, an input end of the metering unit 50 is connected to a second output end of the voltage and current sampling module 30, an output end of the metering unit 50 is connected to a second input end of the processing module 70, and the metering unit 50 is configured to convert the voltage and current sampled by the voltage and current sampling module 30.
Alternatively, the metering unit 50 may meter and convert small signals such as voltage and current at the output end of the relay module 20 through the voltage and current sampling module 30, and input the converted voltage and current into the processing module 70.
Alternatively, the metering unit 50 may send the voltage and current to the processing module 70 via universal asynchronous receiver/Transmitter (UART) serial port communication.
Optionally, the processing module 70 is configured to detect whether the relay module 20 is normal according to the voltage at the input terminal of the relay module 20 detected by the ground continuity detecting module 60 and the voltage output by the metering unit 50.
Alternatively, the processing module 70 may determine whether the relay module 20 is normal or not according to the voltages of the input end of the relay module 20 and the output end of the relay module 20, specifically, whether the relay module 20 sends adhesion or failure. The voltage at the input end of the relay module 20 can be obtained by the sum of the voltages on the live wire and the zero wire detected by the ground continuity detection module 60, and the voltage at the output end of the relay module 20 can be obtained by converting the voltage and current sampling module 30 through the metering unit 50.
Alternatively, when the relay module 20 is turned off, if the voltage at the output terminal of the relay module 20 is 0, it indicates that the relay module 20 is not stuck. If the difference between the voltage at the input end when the relay module 20 is closed and the voltage at the output end when the relay module 20 is opened is within the preset range, it is indicated that adhesion occurs in the relay module 20.
Alternatively, if the difference between the input voltage of the relay module 20 and the output voltage of the relay module 20 is greater than the preset threshold when the relay module 20 is closed, it indicates that the relay module 20 fails.
In this embodiment, the relay detection device of the charging pile includes an ac input port, a relay module, a voltage and current sampling module, an ac output port, a metering unit, a ground continuity detection module and a processing module, where the ac input port, the relay module, the voltage and current sampling module and the ac output port are sequentially connected, the ground continuity detection module is used to detect the voltage of the input end of the relay module and send the voltage and current of the output end of the relay module sampled by the voltage and current sampling module to the processing module, and the processing module determines whether the relay module is normal by determining the voltage output by the ground continuity detection module and the voltage of the output end of the relay module. Because the metering unit is at relay module's output for voltage and electric current of measuring relay module output, and not just be connected at relay module's input like among the prior art, only be used for measuring relay module input's voltage and electric current, if need judge whether relay module adhesion still need set up isolation sampling circuit, therefore the hardware that uses in this application is less, and the hardware cost is low, and the circuit is simple. In addition, the voltage and current sampling module and the metering unit are used, compared with an isolation sampling circuit which is not adopted in the prior art, the circuit reliability is improved, and false alarm faults are avoided.
Hereinafter, a specific structure of the relay module 20 will be described with reference to fig. 2. The relay module 20 includes a first relay 201 and a second relay 202.
Optionally, the live wire input end and the ground wire input end of the first relay 201 are respectively connected to the live wire end and the ground wire end of the ac input port 10, and the output end of the first relay 201 is connected to the input end of the voltage and current sampling module 30.
Optionally, the neutral input terminal and the ground input terminal of the second relay 202 are connected to the neutral terminal and the ground terminal of the ac input port 10, respectively, and the output terminal of the second relay 202 is connected to the input terminal of the voltage and current sampling module 30.
Optionally, the first relay 201 and the second relay 202 in the relay module 20 are connected to the live wire and the zero wire respectively, and the on-off of the first relay 201 and the second relay 202 is controlled by the processing module 70. When the first relay 201 and the second relay 202 are simultaneously conducted, the charging pile is conducted, and the electric automobile can be charged from the alternating current output port 40 through the charging gun.
Illustratively, taking the first relay 201 as an example, the structure of the first relay 201 is shown with reference to fig. 3. The first relay 201 unit includes a fifth resistor R5, a sixth resistor R6, a first triode Q1, a first diode D1, a second diode D2 and a first switch K1, one end of the fifth resistor R5 is used for receiving an on-off instruction of the processing module 70, the other end of the fifth resistor R5 is connected with a base electrode of the first triode Q1 and one end of the sixth resistor R6 respectively, the other end of the sixth resistor R6 is grounded, a collector electrode of the first triode Q1 is grounded, an emitter electrode of the first triode Q1 is connected with one end of a control end of the first switch K1 and a cathode electrode of the first diode D1 respectively, an anode electrode of the first diode D1 is connected with an anode electrode of the second diode D2, a cathode electrode of the second diode D2 is connected with the other end of the control end of the first switch K1, and a power signal is connected, wherein the power signal can be a 12 volt power supply. One end of the first switch K1 is connected to the live wire of the ac input port 10, and the other end of the first switch K1 is connected to the live wire of the input end of the voltage and current sampling module 30. The first diode D1 and the second diode D2 may be used to absorb the energy of the moment when the first switch K1 is turned off. Wherein the ground may be a ground line. The second relay 202 has the same structure as the first relay 201, and is used for controlling the on-off of the zero line.
In this embodiment, the first relay and the second relay are connected to the live wire input end and the zero line input end respectively, so as to control the on-off of the live wire and the zero line in the power loop respectively, thereby ensuring the safety of the charging pile.
Next, a specific structure of the ground continuity detecting module 60 will be described with reference to fig. 4. The ground continuity detecting module 60 includes a first ground continuity detecting unit 601 and a second ground continuity detecting unit 602.
Optionally, two input ends of the first ground continuity detecting unit 601 are respectively connected to a live wire input end and a ground wire input end of the first relay 201.
Optionally, the first ground continuity detecting unit 601 is configured to detect a voltage at an input end of a live wire of the first relay 201, and determine whether the first relay 201 is grounded normally, so as to ensure circuit safety.
Optionally, two input terminals of the second ground continuity detecting unit 602 are connected to the neutral input terminal and the ground input terminal of the second relay 202, respectively.
Optionally, the second ground continuity detecting unit 602 is configured to detect a voltage at the neutral input of the second relay 202. And judges whether the second relay 202 is grounded normally or not, so that the circuit safety is ensured.
Optionally, an output of the first ground continuity detecting unit 601 and an output of the second ground continuity detecting unit 602 are respectively connected to a first input of the processing module 70.
Alternatively, the first ground continuity detecting unit 601 and the second ground continuity detecting unit 602 respectively send the detected voltages to the processing module 70, and the processing module 70 may add the live wire input terminal voltage of the relay module 20 and the neutral wire input terminal voltage of the relay module 20 to obtain the input terminal voltage of the relay module 20.
In this embodiment, the input ends of the first grounding continuity detecting unit and the second grounding continuity detecting unit are respectively connected with the input ends of each relay in the relay module, so that the live wire input end voltage and the zero line input end voltage of the relay module are sent to the processing module, and the processing module obtains the input end voltage of the relay module.
Next, a specific structure of the first ground continuity detecting unit 601 will be described with reference to fig. 5: the first ground continuity detecting unit 601 includes: a first resistor R1, a second resistor R2 and a first operational amplifier U1.
Optionally, one end of the first resistor R1 is connected to the live wire input end of the first relay 201, and the other end of the first resistor R1 is connected to the first input end of the first operational amplifier U1.
Optionally, one end of the second resistor R2 is connected to the ground input end of the first relay 201, and the other end of the second resistor R2 is connected to the second input end of the first operational amplifier U1.
Optionally, the first resistor R1 and the second resistor R2 are used for balancing offset current of the input end of the first operational amplifier U1.
Optionally, the output of the first operational amplifier U1 is connected to a first input of the processing module 70.
Optionally, the output terminal of the first operational amplifier U1 is configured to send the voltage at the live wire input terminal of the first relay 201 to the processing module 70 through analog-to-digital conversion, and determine whether the grounding of the first relay 201 is normal.
Optionally, the first operational amplifier U1 is further connected to the positive and negative electrodes of the power supply through two pins.
Next, a specific structure of the second ground continuity detecting unit 602 will be described with reference to fig. 6: the second ground continuity detecting unit 602 includes: a third resistor R3, a fourth resistor R4 and a second operational amplifier U2.
Optionally, one end of the third resistor R3 is connected to the zero line input end of the second relay 202, and the other end of the third resistor R3 is connected to the first input end of the second operational amplifier U2.
Optionally, one end of the fourth resistor R4 is connected to the ground input end of the second relay 202, and the other end of the fourth resistor R4 is connected to the second input end of the second operational amplifier U2.
Optionally, the third resistor R3 and the fourth resistor R4 are used for balancing the offset current of the input end of the first operational amplifier U1.
Optionally, the output of the second operational amplifier U2 is connected to a first input of the processing module 70.
Optionally, the output terminal of the second operational amplifier U2 is configured to send the voltage at the zero line input terminal of the second relay 202 to the processing module 70 through analog-to-digital conversion, and determine whether the grounding of the first relay 201 is normal.
Optionally, the second operational amplifier U2 is further connected to the positive and negative electrodes of the power supply through two pins.
In this embodiment, the first resistor, the second resistor, the third resistor and the fourth resistor ensure stability of the input end of the operational amplifier, thereby ensuring accuracy of voltages detected by the first operational amplifier and the second operational amplifier.
Next, another structure of the relay detection apparatus for the charging pile will be described with reference to fig. 7.
Optionally, the relay detection device of the charging pile further comprises a lightning protection module 80.
Optionally, an input end of the lightning protection module 80 is connected to the ac input port 10, and an output end of the lightning protection module 80 is connected to an input end of the relay module 20.
Optionally, the lightning protection module 80 is used for lightning protection, specifically, when the charging pile is struck by lightning, lightning is led into the ground, so as to avoid the charging pile from being damaged by the lightning.
In this embodiment, lightning protection is carried out to the AC input port through setting up lightning protection module, avoids charging stake to receive the thunderbolt damage.
Next, another configuration of the relay detection apparatus of the charging pile will be described with reference to fig. 8.
Optionally, the relay detection device of the charging pile further includes a leakage detection module 90.
Optionally, an input end of the leakage detection module 90 is connected with an output end of the lightning protection module 80, a first output end of the leakage detection module 90 is connected with the processing module 70, and a second output end of the leakage detection module 90 is connected with an input end of the relay module 20.
Optionally, the leakage detection module 90 is configured to detect whether the charging pile is leaking electricity, and if so, send leakage status information to the processing module 70. The processing module 70 may determine whether the charging pile is malfunctioning based on the leakage status information.
It should be noted that if the charging pile leaks electricity, it may cause the processing module 70 to determine whether the charging pile is faulty or not according to the voltage at the input terminal and the voltage at the output terminal of the relay module 20. Therefore, it is necessary to ensure that no leakage occurs in the charging pile before the processing module 70 judges a failure by the voltage across the terminals.
In this embodiment, whether the electric leakage occurs in the charging pile is judged through the electric leakage detection module, so that the accuracy of the detection result of the charging pile detection device is improved.
Optionally, an output end of the processing module 70 is connected to a control end of the relay module 20, and the processing module 70 is further configured to send an on-off instruction to the relay module 20 via the output end of the processing module 70 and the control end of the relay module 20.
Alternatively, referring to fig. 3, taking the first relay 201 as an example, the processing module 70 may send an on-off instruction to the control port ARM L1 CTRL, so as to control on-off of the first switch K1, thereby controlling the working state of the relay.
In this embodiment, the processing module controls the relay of the relay module to be turned on or off, so that the grounding continuity detecting module and the voltage and current sampling module can obtain voltages of different states of the relay module.
The specific functions of the processing module 70 are described below:
alternatively, if the voltage output by the metering unit 50 is not 0 when the relay module 20 is turned off, and the difference between the voltage output by the metering unit 50 when the relay module 20 is turned off and the voltage output by the ground continuity detecting module 60 when the relay module 20 is turned on is smaller than the first preset threshold, the abnormality of the relay module 20 is detected.
Alternatively, if the voltage output by the metering unit 50 is not 0 when the relay module 20 is turned off, and the difference between the voltage output by the metering unit 50 and the voltage output by the ground continuity detecting module 60 when the relay module 20 is turned off is smaller than the first preset threshold when the relay module 20 is turned on, it is detected that the relay module 20 is stuck. If the voltage output by the metering unit 50 is 0 when the relay module 20 is turned off, it is indicated that the relay module 20 does not transmit adhesion.
Alternatively, the first preset threshold may be a voltage value preset by a detecting person, and by setting the first preset threshold, it is possible to avoid that the processing module 70 affects whether the relay module 20 is normal or not when the power loss or other situations occur in each module in the charging pile. For example, the first preset threshold may be 0.5 volts.
Alternatively, when the relay module 20 is closed, if the difference between the voltage output by the metering unit 50 and the voltage output by the ground continuity detecting module 60 is greater than the second preset threshold, an abnormality of the relay module 20 is detected.
Alternatively, when the difference between the voltage output from the metering unit 50 and the voltage output from the ground continuity detecting module 60 is greater than the second preset threshold value, it may be determined that the relay module 20 is malfunctioning. Otherwise, the relay module 20 does not send a fault.
Alternatively, the second preset threshold may be a voltage value preset by a detecting person, and by setting the second preset threshold, the situation that the charging pile has faults of other modules in each module can be avoided, so that the judgment of whether the processing module 70 has faults on the relay module 20 is affected. The second preset threshold may be, for example, 5 volts.
In this embodiment, the processing module detects whether the relay module sends adhesion or failure according to the voltage output by the relay module and the voltage output by the metering unit detected by the ground continuity detecting module, so as to ensure the accuracy of the detection result.
The embodiment of the application also provides a charging pile, which comprises any relay detection device of the charging pile.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered in the protection scope of the present application.
Claims (10)
1. The relay detection device of the charging pile is characterized by comprising an alternating current input port, a relay module, a voltage and current sampling module, an alternating current output port, a metering unit, a grounding continuity detection module and a processing module;
the input end of the relay module is connected with the alternating current input port, the output end of the relay module is connected with the input end of the voltage and current sampling module, the first output end of the voltage and current sampling module is connected with the alternating current output port, and the voltage and current sampling module is used for sampling the voltage and the current of the output end of the relay module;
the input end of the grounding continuity detection module is connected with the input end of the relay module, the output end of the grounding continuity detection module is connected with the first input end of the processing module, and the grounding continuity detection module is used for detecting the voltage of the input end of the relay module;
the input end of the metering unit is connected with the second output end of the voltage and current sampling module, the output end of the metering unit is connected with the second input end of the processing module, and the metering unit is used for converting the voltage and the current sampled by the voltage and current sampling module;
the processing module is used for detecting whether the relay module is normal or not according to the voltage of the input end of the relay module detected by the grounding continuity detection module and the voltage output by the metering unit.
2. The apparatus of claim 1, wherein the relay module comprises: a first relay and a second relay;
the live wire input end and the ground wire input end of the first relay are respectively connected to the live wire end and the ground wire end of the alternating current input port, and the output end of the first relay is connected with the input end of the voltage and current sampling module;
the zero line input end and the ground wire input end of the second relay are respectively connected to the zero line end and the ground wire end of the alternating current input port, and the output end of the second relay is connected with the input end of the voltage and current sampling module.
3. The apparatus of claim 2, wherein the ground continuity detection module comprises a first ground continuity detection unit and a second ground continuity detection unit;
two input ends of the first grounding continuity detection unit are respectively connected with a live wire input end and a ground wire input end of the first relay;
two input ends of the second grounding continuity detection unit are respectively connected with a zero line input end and a ground wire input end of the second relay;
the output end of the first grounding continuity detecting unit and the output end of the second grounding continuity detecting unit are respectively connected with the first input end of the processing module.
4. A device according to claim 3, wherein the first ground continuity detecting unit comprises: the first resistor, the second resistor and the first operational amplifier;
one end of the first resistor is connected with the live wire input end of the first relay, and the other end of the first resistor is connected with the first input end of the first operational amplifier;
one end of the second resistor is connected with the ground wire input end of the first relay, and the other end of the second resistor is connected with the second input end of the first operational amplifier;
the output end of the first operational amplifier is connected with the first input end of the processing module.
5. A device according to claim 3, wherein the second ground continuity detecting unit comprises: the third resistor, the fourth resistor and the second operational amplifier;
one end of the third resistor is connected with the zero line input end of the second relay, and the other end of the third resistor is connected with the first input end of the second operational amplifier;
one end of the fourth resistor is connected with the ground wire input end of the second relay, and the other end of the fourth resistor is connected with the second input end of the second operational amplifier;
the output end of the second operational amplifier is connected with the first input end of the processing module.
6. The apparatus of claim 1, wherein the apparatus further comprises: a lightning protection module;
the input end of the lightning protection module is connected with the alternating current input port, and the output end of the lightning protection module is connected with the input end of the relay module.
7. The apparatus of claim 6, wherein the apparatus further comprises: the electric leakage detection module;
the input end of the electric leakage detection module is connected with the output end of the lightning protection module, the first output end of the electric leakage detection module is connected with the processing module, and the second output end of the electric leakage detection module is connected with the input end of the relay module.
8. The apparatus of claim 1, wherein the output of the processing module is coupled to the control of the relay module, the processing module further configured to send an on-off command to the relay module via the output of the processing module and the control of the relay module.
9. The apparatus according to claim 1, wherein the processing module is specifically configured to:
when the relay module is disconnected, if the voltage output by the metering unit is not 0, and the difference value between the voltage output by the metering unit when the relay module is disconnected and the voltage output by the grounding continuity detection module when the relay module is closed is smaller than a first preset threshold value, detecting that the relay module is abnormal;
when the relay module is closed, if the difference value between the voltage output by the metering unit and the voltage output by the grounding continuity detection module is larger than a second preset threshold value, abnormality of the relay module is detected.
10. A charging pile, characterized in that the charging pile comprises a relay detection device of the charging pile according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322151496.XU CN220552952U (en) | 2023-08-10 | 2023-08-10 | Relay detection device of charging pile and charging pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322151496.XU CN220552952U (en) | 2023-08-10 | 2023-08-10 | Relay detection device of charging pile and charging pile |
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| CN220552952U true CN220552952U (en) | 2024-03-01 |
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| CN202322151496.XU Active CN220552952U (en) | 2023-08-10 | 2023-08-10 | Relay detection device of charging pile and charging pile |
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| Country | Link |
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| CN (1) | CN220552952U (en) |
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