CN220525927U

CN220525927U - Low-power consumption alternating-current charging pile load tester

Info

Publication number: CN220525927U
Application number: CN202321869760.7U
Authority: CN
Inventors: 许春山; 麦庆华; 段现均
Original assignee: Shenzhen Athx Technology Co ltd
Current assignee: Shenzhen Athx Technology Co ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2024-02-23
Anticipated expiration: 2033-07-17

Abstract

The utility model provides a low-power consumption alternating current charging stake load tester, includes resistant electric current capability test portion at least for to the electric current capability test of the charging line of charging stake, resistant electric current capability test portion includes low-voltage heavy current circuit, low-voltage heavy current circuit outputs predetermined current to the charging line of being tested charging stake, and tests the resistance of the charging line of charging stake as the partial load of low-voltage heavy current circuit, and the electric energy feedback of the charging circuit of being tested in the test process is to the mains supply. The utility model has the advantages of low power consumption and effective recovery of electric energy.

Description

Low-power consumption alternating-current charging pile load tester

Technical Field

The utility model relates to the field of energy, in particular to a low-power consumption alternating-current charging pile load tester.

Background

As a high power output carrier, the design, assembly and material requirements of the ac charging stake are very strict. In order to avoid defective products or potential safety hazards, all charging pile equipment needs to carry out necessary testing and ageing on charging output at each stage of research, production, installation and after-sales. Sometimes, a charging pile manufacturer can test by using a physical automobile, but the charging pile cannot be used as a conventional test due to large size and high price, and in the prior art, the conventional test alternating current charging pile is preferably an alternating current charging pile load tester. The conventional ac charging pile tester generally comprises two parts, wherein the first part is a communication capability testing part, a vehicle simulating control device is arranged in the tester, and the tester is matched with a power supply control device arranged in a charging pile after being plugged with the ac charging pile for testing the communication capability of the ac charging pile, and the first part is not an improvement point of the utility model and is not described in detail below. The second part is a current resistance capability test part, which is an internal or external load resistor of the tester as a load, wherein the load resistor is generally a pure resistive load resistor, and has the function of simulating the battery load of the electric vehicle during charging so as to detect the current resistance capability of a charging circuit of the charging pile under the condition of high load, and the resistance value of the load resistor is changed or the load resistors with different resistance values are selected so as to adapt to the current resistance test of L lines and N lines of the alternating current charging pile, such as the current resistance test of adopting various currents such as 10A,16A, 32A and 63A and the like for simulated charging. The test of the charging circuit in the utility model comprises the current resistance test of components such as a cable assembly, a contact point, an alternating current switch, a vehicle plug and the like.

The load resistor of the traditional tester consumes great energy when in use, so that heat is generated, and the power consumption acting on the load resistor is completely wasted. The electric automobile alternating-current charging pile simulation charging device disclosed in the Chinese patent document CN 213544709U is the alternating-current charging pile load testing device.

Disclosure of Invention

The utility model aims to provide a low-power consumption alternating-current charging pile load tester which is low in power consumption and capable of effectively recycling electric energy.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a low-power consumption alternating current charging stake load tester, at least, including resistant electric current ability test unit for to the electric current ability test of the charging line of charging stake, resistant electric current ability test unit includes low-voltage heavy current circuit, low-voltage heavy current circuit outputs predetermined current to the charging line of charging stake to be tested to regard the resistance of the charging line of charging stake as the partial load of low-voltage heavy current circuit to test, the electric energy feedback of the charging circuit of testing in the test process to the commercial power network.

As an improvement of the utility model, the low-voltage high-current circuit comprises a first transformer and a second transformer, wherein the first input voltage V1 of a first primary coil of the first transformer is in-phase and basically equal to the first output voltage V2 of a first secondary coil of the first transformer, and the first input voltage V1 is equal to the input voltage of the mains supply; the second input voltage V3 of the second primary coil of the second transformer is provided by the mains supply, and the second output voltage V4 of the second secondary coil of the second transformer is smaller than the second input voltage V3; the first secondary coil is connected in series with the second secondary coil, a first free end of the first secondary coil is connected with a first interface, and a second free end of the second secondary coil is connected with a second interface; during testing, the first interface is connected with a first vehicle interface of the tested charging pile, the second interface is connected with a second vehicle interface of the tested charging pile, and the first commercial power input interface and the second commercial power input interface of the tested charging pile are in lap joint with commercial power.

As an improvement of the utility model, the utility model further comprises a live wire overlapping wire and a zero wire overlapping wire, wherein one end of the live wire overlapping wire is connected with the mains supply live wire input wire, one end of the live wire overlapping wire is connected with the live wire interface, one end of the zero wire overlapping wire is connected with the mains supply zero wire input wire, and one end of the zero wire overlapping wire is connected with the zero wire interface.

As an improvement of the utility model, the charging circuit comprises a first charging circuit and a second charging circuit, the first charging circuit comprises a first charging cable, a first alternating current switch, a first vehicle interface and a first mains supply input interface, the first vehicle interface and the first mains supply input interface are positioned at two ends of the first charging cable, and the first alternating current switch is connected in series in the middle of the first charging cable; the second charging circuit comprises a second charging cable, a second alternating current switch, a second vehicle interface and a second mains supply input interface, wherein the second vehicle interface and the second mains supply input interface are positioned at two ends of the second charging cable, and the second alternating current switch is connected in series in the middle of the second charging cable.

As an improvement of the present utility model, the present utility model further includes a current detection and control circuit, a current sensor and an electronic voltage regulator, the current sensor detecting a current value of the secondary coil and supplying the detected current value to the current detection and control circuit, the current detection and control circuit controlling the second input voltage V3 of the second primary coil through the electronic voltage regulator according to the detected current value.

As an improvement to the utility model, the current detection and control circuit comprises an analog-digital conversion circuit, an MCU singlechip and an isolation driving circuit, wherein the analog-digital conversion circuit reads a current signal of the current sensor, converts the current signal into a corresponding digital signal and transmits the corresponding digital signal to the MCU singlechip, and outputs a PWM control signal through closed-loop control of the MCU singlechip, and the PWM control signal is used for controlling the operation of the electronic voltage regulator through the isolation driving circuit.

The utility model adopts the low-voltage high-current circuit to directly act on the charging line of the charging pile to be tested, takes the charging line as a load, and can save more than 90% of power consumption used in aging test and tens of watts of power consumption compared with the common test mode of the load-connecting resistor, thus the current requirement required by the equipment for testing a plurality of kilowatts can be met; the utility model adopts the charging loop to feed back the electric energy to the commercial power network, thereby effectively saving the electric energy. In addition, the utility model can be directly connected with the charging pile to be tested without damaging the original circuit, and is convenient to use; by using two groups of balanced outputs, high current can be provided for current resistance test of the charging pile equipment line, and meanwhile leakage current cannot be generated, so that erroneous judgment is caused. The utility model can provide all the test functions required by the AC charging pile, and provides current resistance test for cable assemblies, contact points, AC switches, vehicle plugs and the like. The utility model has small size and convenient carrying, and is suitable for various places of offices, processing factories and parking lots.

Drawings

Fig. 1 is a schematic diagram of the principle structure of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of the circuit principle structure of fig. 1.

Fig. 3 is a simplified circuit schematic of fig. 2.

Fig. 4 is a schematic diagram of the current detecting and controlling circuit in fig. 2.

Description of the embodiments

The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1 and 2, fig. 1 and 2 disclose a low-power consumption ac charging pile load tester, which at least includes a current-withstanding capability test part 1 for testing the current-withstanding capability of a charging circuit 20 of a charging pile 2, the current-withstanding capability test part 1 includes a low-voltage high-current circuit 11, the low-voltage high-current circuit 11 outputs a predetermined current to the charging circuit 20 of the charging pile 2 to be tested, and the resistance of the charging circuit 20 of the charging pile 2 is used as a partial load of the low-voltage high-current circuit 11 to be tested, and the electric energy of the charging circuit to be tested in the test process is fed back to a utility network. In the present utility model, the resistances of the charging line 20 used as the load, including the resistances of the live wire, the neutral wire, the first secondary coil, the second secondary coil, and the like, which are used for connection to the charging line 20, and the resistances of the various interfaces, and the like, are the load of the low-voltage high-current circuit 11, and in short, the resistances of all the components in the output circuit of the low-voltage high-current circuit 11 are the load, and since the sum of the resistances of all the components of the present utility model is far smaller than the power resistance in the prior art, the electric power loss of the present utility model is low (only the power consumption of several tens of times of the power consumption of the commercial ac charging pile tester); in addition, the utility model adopts the charging loop to be tested in the test process to feed back the electric energy to the commercial power network, so that the electric energy can be effectively saved.

In this embodiment, the present utility model further includes a vehicle control circuit 12, where the vehicle control circuit 12 generates a communication analog signal for detecting the communication capability of the tested ac charging pile, and as can be seen from fig. 1, one end of the vehicle control circuit 12 is grounded after passing through the CC end 5, the resistor R1, and the PE end 5; the other end of the vehicle control circuit 12 is connected with a power supply control device 27 of the variable current charging pile 2 after passing through the CP end 7. In the present utility model, the vehicle control circuit 12 is a prior art, and will not be described herein. In the utility model, the functions of the original voltage detection, current detection and leakage protection circuit of the tested alternating current charging pile are unchanged.

Referring to fig. 2 and 3, the low-voltage high-current circuit 11 includes a first transformer 111 and a second transformer 112, wherein a first input voltage V1 of a first primary winding 1111 of the first transformer 111 is in-phase and substantially equal to a first output voltage V2 of a first secondary winding 1112 of the first transformer 111, and the first input voltage V1 is equal to a mains input voltage; the second input voltage V3 of the second primary winding 1121 of the second transformer 112 is provided by the mains, the second output voltage V4 of the second secondary winding 1122 of the second transformer 112 is smaller than the second input voltage V3 (the ratio of the second input voltage V3 to the second output voltage V4 of the second transformer 112 may be selected between 20:1 and 100:1); the first secondary winding 1112 is connected in series with the second secondary winding 1122, a first free end 1113 of the first secondary winding 1112 is connected to the first interface 1114, and a second free end 1123 of the second secondary winding 1122 is connected to the second interface 1124; during testing, the first interface 1114 is connected with the first vehicle interface 21 of the tested charging pile 2, the second interface 1124 is connected with the second vehicle interface 22 of the tested charging pile 2, and the first mains input interface 23 and the second mains input interface 24 of the tested charging pile 2 are connected and directly or indirectly lapped with the mains through the first mains input interface 23 and the second mains input interface 24.

Preferably, the utility model further comprises a live wire backlap wire 117 and a zero wire backlap wire 113, wherein one end of the live wire backlap wire 117 is connected with a mains power line input wire, the other end of the live wire backlap wire 117 is connected with a live wire interface 1171, one end of the zero wire backlap wire 113 is connected with a mains power zero wire input wire, and the other end of the zero wire backlap wire 113 is connected with a zero wire interface 1131.

Preferably, the charging circuit 20 includes a first charging circuit 25 and a second charging circuit 26, the first charging circuit 25 includes a first charging cable 251, a first ac switch K1, a first vehicle interface 21 and a first utility power input interface 23, the first vehicle interface 21 and the first utility power input interface 23 are located at two ends of the first charging cable 251, and the first ac switch K1 is connected in series between the first charging cable 251; the second charging circuit 26 includes a second charging cable 261, a second ac switch K2, a second vehicle interface 22 and a second utility power input interface 24, where the second vehicle interface 22 and the second utility power input interface 24 are located at two ends of the second charging cable 261, and the second ac switch K2 is connected in series between the second charging cable 261.

The working principle of the utility model is as follows: when the low-power-consumption alternating-current charging pile load tester is used, a low-power-consumption alternating-current charging pile load tester corresponding to the charging current is selected, and the common charging current is various currents such as 10A,16A, 32A and 63A; the first transformer 111 and the second transformer 112 are connected with the mains supply, the first interface 1114 is connected with the first vehicle interface 21, the second interface 1124 is connected with the second vehicle interface 22, the first mains supply input interface 23 is connected with the neutral interface 1131, and the second mains supply input interface 24 is connected with the fire wire interface 1171; or the first mains input interface 23 and the second mains input interface 24 are directly connected with the live wire L and the zero wire N of the power grid. The first ac switch K1 and the second ac switch K2 are turned on to conduct the live wire L and the neutral wire N, and the live wire L and the neutral wire N are output to the ac input port (i.e., the first commercial power input interface 23 and the second commercial power input interface 24) of the ac charging pile 2, and the first leg 1 and the fourth leg 4 of the vehicle interface, through the low-voltage high-current circuit 11, to perform charging simulation with a low-voltage high-current. In the figure, the fifth pin 5, the sixth pin 6 and the seventh pin 7 are status detection and communication pins, and can perform analog communication detection; the second leg 2 and the third leg 3 are reserved three-phase charging legs.

In the present utility model, the ratio of the first input voltage V1 to the first output voltage V2 of the first transformer 111 is about 1:1, the ratio of the second input voltage V3 to the second output voltage V4 of the second transformer 112 can be selected from 20:1 to 100:1, and a voltage difference of several volts (generally 1-4 volts, which can be set according to different requirements of the detected charging pile 2) exists between the first output voltage V2 and the first input voltage V1 after the voltages of the first output voltage V2 and the second output voltage V4 are superimposed.

The charging current of the charging line 20 is determined by the following formula:

referring to fig. 3, i=vin-VOUT is divided by the total resistance R, and the absolute value of i=v1- (v2+v4) is divided by the total resistance R of the ac charging circuit according to the schematic diagram of fig. 2; wherein r= (zl1+zl2+zk1+zn1+zk2+zn2); the VIN and VOUT of the charging line produce a voltage difference that is realized by an electronic voltage regulator or transformer turns ratio that produces a line current for testing.

Wherein ZL1 is the first L-line impedance; ZL2 is the second L line impedance; ZK1 is the K1 impedance; ZN1 is the first N line impedance; ZK2 is the K2 impedance; ZN2 is the second N-line impedance (see fig. 3).

For example, if the total resistance r=0.1 ohms (typically 0.0-0.2 ohms) of the ac charging circuit of the charging stake 2 to be tested, a charging current I of 32A (32A is the charging current required for a 7KW ac charging stake) is required. The voltage difference is 0.1×32=3.2v, i.e. only an ac voltage difference of about 3.2V needs to be provided, so as to achieve the current-resistant test current required by the 7KW ac charging pile 2. The equation can also be used to calculate if the test current of the ac charging stake 2 under test is 10a,16a, or 63A.

Under normal conditions, the impedance of the live wire L and the zero line N is smaller and is usually lower than 0.2 ohms (the live wire L and the zero line N with overlarge impedance can generate overlarge electric energy loss and can not charge an automobile normally), so the utility model can meet the current resistance test by only measuring the impedance of the live wire L and the zero line N, and has small electric energy loss and low cost; in addition, the utility model adopts the charging loop to be tested in the test process to feed back the electric energy to the commercial power network, so that the electric energy can be effectively saved.

Referring to fig. 4, in order to improve the versatility of the present utility model, the present utility model further includes a current detecting and controlling circuit 114, a current sensor 115 and an electronic voltage regulator 116, wherein the current sensor 115 detects a current value of the secondary coil and transmits the detected current value to the current detecting and controlling circuit 114, and the current detecting and controlling circuit 114 controls the second input voltage V3 of the second primary coil 1121 through the electronic voltage regulator 116 according to the detected current value. Thus, the total resistance R of the AC charging circuit of the AC charging pile 2 to be tested can be automatically adapted when the total resistance R is changed.

Preferably, the current detecting and controlling circuit 114 includes an analog-to-digital conversion circuit 1141, an MCU singlechip 1142 and an isolation driving circuit 1143, wherein the analog-to-digital conversion circuit 1141 reads a current signal of the current sensor 115, converts the current signal into a corresponding digital signal, transmits the digital signal to the MCU singlechip 1142, and outputs a PWM control signal through closed-loop control of the MCU singlechip 1142, and the isolation driving circuit 1143 is used for controlling the electronic voltage regulator 116 to operate, specifically, the electronic voltage regulator 116 changes a second output voltage V4 of the second secondary coil 1122 by controlling a second input voltage V3 of the second primary coil 1121, so that a current passing through the charging circuit 20 is kept at a predetermined current; the predetermined current may be selected between 1A-70A, the most common predetermined current being 10A,16A, 32A or 63A.

In the present utility model, the current sensor 115 may be an integrated current detection chip manufactured by shanghai's micro-electronics corporation under the model number MT 9522;

the analog-digital conversion circuit 1141 and the MCU singlechip 1142 may be split type, or may be integrated chip, and when using the integrated chip, a chip with model STM32F030C8T6 manufactured by Italian semiconductor Co., ltd (ST) may be used;

the isolation driving circuit 1143 may be a photoelectric coupling element manufactured by toshiba corporation (Toshiba Corporation) and having a model TLP 2395;

the electronic voltage regulator 116 may be an electronic voltage regulator manufactured by Shanghai pine energy electronic limited company and having a model number of 116 ZXB-300W.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a low-power consumption alternating current charging stake load tester, includes resistant electric current ability test portion (1) at least for to the electric current ability test of charging line (20) of charging stake (2), its characterized in that, resistant electric current ability test portion (1) include low-voltage heavy current circuit (11), low-voltage heavy current circuit (11) output predetermined current is given charging line (20) of being tested charging stake (2) to the resistance of charging line (20) of charging stake (2) is tested as the partial load of low-voltage heavy current circuit (11), and in the test process, the electric energy of the charging loop of being tested feeds back to the commercial power network.

2. The low-power consumption ac charging pile load tester according to claim 1, wherein the low-voltage high-current circuit (11) comprises a first transformer (111) and a second transformer (112), a first input voltage (V1) of a first primary coil (1111) of the first transformer (111) is in-phase and substantially equal to a first output voltage (V2) of a first secondary coil (1112) of the first transformer (111), the first input voltage (V1) being equal to a mains input voltage; -a second input voltage (V3) of a second primary winding (1121) of the second transformer (112) is provided by mains, a second output voltage (V4) of a second secondary winding (1122) of the second transformer (112) being smaller than the second input voltage (V3); the first secondary coil (1112) is connected in series with the second secondary coil (1122), a first free end (1113) of the first secondary coil (1112) is connected with a first interface (1114), and a second free end (1123) of the second secondary coil (1122) is connected with a second interface (1124); during testing, the first interface (1114) is connected with a first vehicle interface (21) of the tested charging pile (2), the second interface (1124) is connected with a second vehicle interface (22) of the tested charging pile (2), and a first mains supply input interface (23) and a second mains supply input interface (24) of the tested charging pile (2) are connected.

3. The low-power consumption AC charging pile load tester according to claim 2, further comprising a live wire backlap wire (117) and a zero wire backlap wire (113), wherein one end of the live wire backlap wire (117) is connected with a mains power live wire input wire, the other end of the live wire backlap wire (117) is connected with a live wire interface (1171), one end of the zero wire backlap wire (113) is connected with a mains power zero wire input wire, and the other end of the zero wire backlap wire (113) is connected with a zero wire interface (1131).

4. The low-power consumption ac charging pile load tester according to claim 1, 2 or 3, wherein the charging circuit (20) comprises a first charging circuit (25) and a second charging circuit (26), the first charging circuit (25) comprises a first charging cable (251), a first ac switch (K1), a first vehicle interface (21) and a first mains input interface (23), the first vehicle interface (21) and the first mains input interface (23) are located at two ends of the first charging cable (251), and the first ac switch (K1) is connected in series between the first charging cable (251); the second charging circuit (26) comprises a second charging cable (261), a second alternating current switch (K2), a second vehicle interface (22) and a second mains supply input interface (24), wherein the second vehicle interface (22) and the second mains supply input interface (24) are positioned at two ends of the second charging cable (261), and the second alternating current switch (K2) is connected in series in the middle of the second charging cable (261).

5. The low power consumption ac charging pile load tester according to claim 1, 2 or 3, further comprising a current detecting and controlling circuit (114), a current sensor (115) and an electronic voltage regulator (116), wherein the current sensor (115) detects a current value of the secondary coil and supplies the detected current value to the current detecting and controlling circuit (114), and the current detecting and controlling circuit (114) controls the second input voltage (V3) of the second primary coil (1121) through the electronic voltage regulator (116) according to the detected current value.

6. The low-power consumption AC charging pile load tester according to claim 5, wherein the current detection and control circuit (114) comprises an analog-digital conversion circuit (1141), an MCU singlechip (1142) and an isolation driving circuit (1143), wherein the analog-digital conversion circuit (1141) reads a current signal of the current sensor (115), converts the current signal into a corresponding digital signal, transmits the corresponding digital signal to the MCU singlechip (1142), outputs a PWM control signal through closed-loop control of the MCU singlechip (1142), and is used for controlling the operation of the electronic voltage regulator (116) through the isolation driving circuit (1143).