WO2019062961A1

WO2019062961A1 - Charging device and charging pile

Info

Publication number: WO2019062961A1
Application number: PCT/CN2018/108795
Authority: WO
Inventors: 张春枫; 左杰; 黄力坤; 张子奇; 韩林桥
Original assignee: 比亚迪股份有限公司
Priority date: 2017-09-30
Filing date: 2018-09-29
Publication date: 2019-04-04
Also published as: CN110014920B; TWI721285B; CN110014920A; TW201914852A

Abstract

Provided is a charging device, comprising: at least two groups of wiring terminals (10), wherein each group of wiring terminals comprises a positive wiring terminal (11) and a negative wiring terminal (12); and a controller (20) for selectively controlling the transmission current of one of the at least two groups of wiring terminals to charge an apparatus to be charged. The charging device can effectively avoid the over-temperature of the wiring terminals, thereby ensuring that normal charging is carried out. Further provided is a charging pile.

Description

Charging device and charging post

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 30, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present application relates to the field of electric vehicle technology, and in particular, to a charging device and a charging post.

Background technique

At present, energy issues and environmental issues are driving the explosive growth of new energy vehicles, and the number of new energy vehicles is rising. Compared with traditional fuel vehicles, new energy vehicles have great advantages in energy saving and environmental protection. However, the key development targets in new energy vehicles have the drawback of long charging time period. At present, using the increased charging power to shorten the charging time of the electric vehicle is one of the commonly used solutions, but the problem with it is that the charging terminal of the charging interface is severely heated, resulting in burning or charging failure of the terminal, and the whole vehicle cannot be carried out. Normal charging.

Summary of the invention

The present application aims to solve at least one of the technical problems in the above-mentioned techniques to some extent. To this end, the first object of the present application is to provide a charging device capable of effectively preventing the terminal from being overheated, thereby ensuring normal charging.

A second object of the present application is to propose a charging post.

To achieve the above objective, the first aspect of the present application provides a charging apparatus including: at least two sets of terminals, each set of the terminals includes: a positive terminal and a negative terminal; a controller, the control The device selectively controls one of the at least two sets of terminals to transfer current to charge the device to be charged.

According to the charging device of the embodiment of the present application, by providing at least two sets of connection terminals and charging the charging device by selecting one of the at least two sets of connection terminals when the charging device performs the charging operation, the charging device can be prevented from being charged. Always use the same terminal to transmit current, causing the terminal to overheat, thus ensuring normal charging.

In order to achieve the above object, the second aspect of the present application provides a charging post comprising the charging device proposed by the embodiment of the first aspect of the present application.

The charging post of the embodiment of the present application can prevent the terminal from being overheated due to the constant use of the same terminal to transmit current, thereby ensuring normal charging.

DRAWINGS

1 is a block schematic diagram of a charging device in accordance with an embodiment of the present application;

2 is a schematic structural view of a charging device according to an embodiment of the present application;

3 is a topological view of a relay control system in accordance with an embodiment of the present application;

4 is a schematic structural view of a charging device according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a body of a charging device according to an embodiment of the present application; FIG.

6 is a schematic structural view of a body of a charging device according to another embodiment of the present application;

FIG. 7 is a schematic diagram of air circulation in a body of a charging device according to an embodiment of the present application; FIG.

FIG. 8 is a schematic structural view of a charging stand according to an embodiment of the present application; FIG.

Figure 9 is a front elevational view of a charging stand in accordance with one embodiment of the present application;

10 is a block schematic view of a charging post in accordance with an embodiment of the present application.

Reference mark:

Terminal 10, positive terminal 11 and negative terminal 12,

The controller 20, the transformer 21, the first rectifying and filtering unit 22, the first DC power source 23, the first transistor 24, the first bridge 25, and the second rectifying and filtering unit 26,

The body 30, the air slot 31, the intake passage 32, the air inlet 01, the air supply duct 02, the escape slot 33,

Heat sink 40,

Housing 50, injection hole 51,

Liquid metal phase change material cartridge 60,

Charging device 100,

Charging pile 1000, charging gun 1100, charging cabinet 1200,

The charging stand 2100, the charging stand body 2110, the connecting terminal 2120 installed in the charging stand body 2110, the waterproof cover 2130, a set of positive cable 2140, and a set of negative cable 2150.

Detailed ways

The embodiments of the present application are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative, and are not to be construed as limiting.

The charging device and the charging post of the embodiment of the present application will be described below with reference to the accompanying drawings.

1 is a block schematic diagram of a charging device in accordance with an embodiment of the present application. As shown in FIG. 1 , the charging device of the embodiment of the present application includes: at least two sets of terminal blocks 10 and a controller 20 . Wherein, each set of connection terminals 10 includes a positive terminal 11 and a negative terminal 12, and the controller 20 selectively controls a set of transmission currents in at least two sets of terminals 10 to charge the device to be charged.

It can be understood that the controller 20 can be a DSP (Digital Signal Process) chip capable of implementing digital signal processing technology.

In one embodiment of the present application, the charging device can be disposed in a charging post. The charging post of the embodiment of the present application may be a DC charging pile, which can perform DC conversion on the AC power supply to provide charging power for a device to be charged (such as an electric vehicle) connected to the charging pile.

Specifically, the positive terminal 11 of each group of terminals 10 is connected to the positive output terminal of the charging power source, and the negative terminal 12 of each group of terminals 10 is connected to the negative output terminal of the charging power source. The device to be charged may include a charging stand, and when the charging device is connected to the charging stand, the charging power source may transmit a current to the device to be charged through one of the at least two sets of the terminals 10 to charge the device to be charged.

In an embodiment of the present application, as shown in FIG. 2, the charging device may include two sets of terminals, wherein the first of the two sets of terminals includes a positive terminal DC1+ and a negative terminal DC1-, two The second set of terminals in the group of terminals includes a positive terminal DC2+ and a negative terminal DC2-.

Wherein, as shown in FIG. 2, the positive terminal DC1+ of the first group of terminals can be connected to the first positive output terminal a of the charging power source through the first controllable switch K1 and the first resistor R1, and the negative pole of the first group of terminals The terminal DC1- can be connected to the first negative output b of the charging power source through the second controllable switch K2 and the second resistor R2, and the positive terminal DC2+ of the second group of terminals can pass the third controllable switch K3 and the third The resistor R3 is connected to the second positive output terminal c of the charging power source, and the negative terminal DC2- of the second group of terminals is connected to the second negative output terminal d of the charging power source through the fourth controllable switch K4 and the fourth resistor R4.

In an embodiment of the present application, referring to FIG. 2, the connection terminal of the charging device may be disposed in the charging gun 1100 of the charging post, after the charging device is connected to the device to be charged, that is, after the charging gun 1100 is inserted into the gun, the charging device is The terminal block can be connected to a corresponding terminal in the charging stand 2100.

In one embodiment of the present application, the third controllable switch K3 and the fourth controllable switch K4 may be relays.

As shown in FIG. 2, the charging device may further include a relay control system for controlling the third controllable switch K3 and the fourth controllable switch K4 (such as a relay), and for controlling the first controllable switch K1 and the second A time delay circuit breaker of the control switch K2, wherein the relay control system is configured to control one of the at least two sets of terminals to transmit current. As shown in FIG. 2, the first controllable switch K1, the second controllable switch K2, the third controllable switch K3, the fourth controllable switch K4, the controller 20, the relay control system, the delay circuit breaker, and the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the charging power source may be disposed in the charging cabinet 1200 of the charging post.

As shown in FIG. 3, the coil of the third controllable switch K3 and the coil of the fourth controllable switch K4 are connected in series to form a relay coil branch, and the relay control system may include: a transformer 21, a first rectifying and filtering unit 22, and a first straight The power source 23, the first transistor 24, the first bridge 25, and the second rectifying and filtering unit 26 are provided.

As shown in FIG. 3, the transformer 21 includes a primary winding, a first secondary winding, and a second secondary winding, wherein both ends of the primary winding are connected to an alternating current power source (such as AC 220V); two inputs of the first rectifying and filtering unit 22 The end is connected to the first secondary winding, and the DC positive output end of the first rectifying and filtering unit 22 is connected to one end of the relay coil branch; the positive end of the first DC power supply 23 is connected to the other end of the relay coil branch, first The negative terminal of the DC power source 23 is connected to the DC negative output terminal of the first rectifying and filtering unit 22; the collector of the first transistor 24 is connected to the positive terminal of the first DC power source 23, and the emission of the first transistor 24 is performed. The pole is connected to the negative terminal of the first DC power source 23; the first bridge 25 includes a first bridge arm formed by the thermistor RT, a second bridge arm formed by the fifth resistor R5, and a sixth resistor R6 connected in series and adjustable a third bridge arm formed by the potentiometer RP and a seventh bridge arm formed by the seventh resistor R7. The node between the first bridge arm and the second bridge arm is connected to the base of the first transistor 24, and the third bridge arm and a node between the fourth bridge arms is connected to the emitter of the first transistor 24; The two input ends of the rectifying and filtering unit 26 are connected to the second secondary winding, and the DC positive output terminal of the second rectifying and filtering unit 26 is connected to the node between the first bridge arm and the fourth bridge arm, and the second rectifying and filtering unit 26 The DC negative output is connected to a node between the second bridge and the third bridge arm.

As shown in FIG. 3, the first rectifying and filtering unit 22 may include a rectifier bridge formed by diodes D1, D2, D3, and D4, and a filter capacitor C1 connected between two output ends of the rectifier bridge as a first rectification filter. The filter capacitor C2 of the two DC outputs of the unit 22 and the eighth resistor R8 connected to one end of the filter capacitor C1 and one end of the C2. The second rectifying and filtering unit 26 may include a rectifying diode D5, a filter capacitor C3 connected between the cathode of the rectifying diode D5 and one end of the second secondary winding, and a filter capacitor at both ends serving as two DC output ends of the second rectifying and filtering unit 26. C4 and a ninth resistor R9 connected to one end of the filter capacitor C3 and one end of C4. A first protection diode D6 and a second protection diode D7 are further connected between the two DC output terminals of the first rectification filtering unit 22 and the two DC output terminals of the second rectification filtering unit 26, respectively.

Wherein, the thermistor RT can be set corresponding to the first group of terminals, and the first bridge 25 is in an equilibrium state by adjusting the magnitude of the resistance of the adjustable potentiometer RP when the charging device does not start charging.

Based on the structure shown in FIG. 2 and FIG. 3, the controller 20 can control the first controllable switch K1 and the second controllable switch K2 to close when the charging device starts charging operation to transmit current through the first set of terminals DC1+ and DC1-. . When the charging device is working for a relatively short period of time, the temperature of the first group of terminals DC1+ and DC1- is close to the ambient temperature, the resistance of the thermistor RT does not change much, and the first bridge 25 is still in a relatively balanced state. Therefore, the potential difference between the base and the emitter of the first transistor 24 is 0, the first transistor 24 is in an off state, the relay coil branch is not energized, the third controllable switch K3 and the fourth controllable Switch K4 is in the off state. As the temperature of the first set of terminals DC1+ and DC1- increases, the resistance of the thermistor RT decreases, the first bridge 25 loses balance, and the base current of the first transistor 24 increases. The electrode current increases accordingly. When the temperature of the first group of terminals DC1+ and DC1- is greater than the first temperature threshold, the collector current is increased to a certain value, so that the relay coil branch is energized, and the relay control system controls the third controllable switch K3 and the fourth The control switch K4 is closed, the second set of terminals DC2+ and DC2- and the first set of terminals DC1+ and DC1- simultaneously transmitting current to the corresponding terminals of the charging stand 2100.

The controller 20 can detect the state of the third controllable switch K3 and the fourth controllable switch K4 in real time, and delay the first preset time after the third controllable switch K3 and the fourth controllable switch K4 are closed. A controllable switch K1 and a second controllable switch K2 are disconnected to transmit current through the second set of terminals DC2+ and DC2-. Specifically, the resistance values of the third resistor R3 and the fourth resistor R4 may be much larger than the resistance values of the first resistor R1 and the second resistor R2, whereby the current transmitted by the charging power source through the second group of terminals DC2+ and DC2- is relatively It is smaller, and the current transmitted through the first set of terminals DC1+ and DC1- is relatively large. The controller 20 controls the delay circuit breaker to delay the first preset time after the third controllable switch K3 and the fourth controllable switch K4 are closed, and the second group of terminals DC2+ and DC2 are connected to the output end of the charging power source ( For example, after 30s), the first controllable switch K1 and the second controllable switch K2 are turned off to switch to transmit current through the second set of terminals DC2+ and DC2- separately. Through the above-mentioned delay-disconnecting strategy, the first group of terminals DC1+ and DC1- can be prevented from generating arcing when a large current is cut off.

According to the charging device of the embodiment of the present application, by providing at least two sets of connection terminals and selecting a transmission current of one of the two sets of connection terminals when the charging device performs the charging operation, it is possible to prevent the current from being transmitted by using the same connection terminal at all times. This causes the terminal to be overheated, thus ensuring normal charging.

As shown in FIG. 4 to FIG. 7 , at least two sets of terminal blocks 10 in the charging device of the embodiment of the present application are vertically spaced apart, and horizontally arranged between the positive electrode terminal and the negative terminal in each group of terminal blocks 10 . (The charging device includes two sets of terminals as an example in FIGS. 4 to 7).

As shown in FIG. 4 and FIG. 5, the charging device of the embodiment of the present application may further include a body 30. At least two sets of terminals are installed in the body 30. The body 30 is provided with an air slot at each of the positive terminal and the negative terminal. 31. The body 30 is further formed with an intake passage 32, and the intake passage 32 communicates with the air groove 31. Also, the air tank 31 is disposed around the positive terminal or the negative terminal.

As shown in FIG. 6 and FIG. 7, the intake passage 32 may include an intake port 01 and a supply duct 02, and the intake port 01 communicates with an external environment, and the air supply duct 02 is disposed on the outer surface of the body 30 and is connected to the air slot. 31 connected. In one embodiment of the present application, the air supply duct 02 is curved and communicates with each of the air slots 31.

As shown in FIGS. 5 to 7, the upper surface of the body 30 may be provided with a downwardly recessed escape groove 33, and the escape groove 33 communicates with the air inlet 01 and also communicates with the air groove 31. The escape groove 33 extends in the axial direction of the body 30, and the air supply duct 02 has a plurality of axial distributions on the body.

Thus, by providing the air slot and the intake passage, after the charging device is connected to the device to be charged, air can be taken in and out of the body of the charging device and circulated in the intake passage (the arrow shown in FIG. 7 can indicate the air flow direction). The above structure of the embodiment of the present application provides a large contact area between the terminal and the air, and the heat dissipation effect is relatively good, so that the terminal can be effectively prevented from being overheated, thereby ensuring normal charging.

As shown in FIG. 4, the charging device of the embodiment of the present application may further include a heat sink 40 and a housing 50. The heat sink 40 is attached to the rear surface of the body 30. The body 30 is located in the housing 50, and the housing 50 and the body. 30 is filled with thermal conductive material. Further, an injection hole 51 for injecting a heat conductive material is formed on the casing 50. In a specific embodiment of the present application, the heat conductive material may be a thermal conductive silica gel, and the thermal conductive silica gel is injected into the casing 50 through the injection hole 51 to effectively conduct heat to the body 30. The heat sink 40 may be a graphite heat sink, which can be the largest. The heat of the body 30 is absorbed and conducted to the thermally conductive silica gel.

Moreover, as shown in FIG. 4, the charging apparatus of the embodiment of the present application may further include a charging harness (not shown) and a liquid metal phase change material cylinder 60. The charging harness is connected to the terminal, and the liquid metal phase change material cylinder 60 Set on the charging harness.

Thus, by disposing the heat sink 40 and filling the heat conductive material around the body 30, and by pre-filling the liquid metal into the annular liquid metal phase change material cylinder 60 and fixing it to the tail of the body 30, the heat of the heat conductive silica gel can be absorbed. Therefore, the charging device can be effectively dissipated, and the terminal is prevented from being overheated, thereby ensuring normal charging.

In summary, the charging device of the embodiment of the present invention has a simple structure, low cost, easy installation and maintenance, and a stable and reliable control strategy, which not only prevents the terminal from being over-temperature, but also does not have the risk of inducing leakage of the charging interface. Higher security, reliability and usability.

Corresponding to the charging device of the above embodiment, a charging stand can be provided on the device to be charged. As shown in FIG. 8 and FIG. 9, the charging stand may include a charging stand body 2110, a connecting terminal 2120 installed in the charging stand body 2110 and corresponding to the connecting terminal of the charging device, and a waterproof cover rotatable to open or close. 2130 and a set of positive cable 2140 and a set of negative cable 2150 corresponding to the terminal 2120. The charging stand cooperates with the charging device of the above embodiment to realize charging of the lance of the electric vehicle.

In some embodiments, the two types of terminals are used as an example. In other embodiments of the present application, when the terminal is two or more, the two terminals may be referred to as two sets of implementations, and details are not described herein.

Corresponding to the above embodiments, the present application also proposes a charging post.

As shown in FIG. 10, the charging post 1000 of the embodiment of the present application includes the charging device 100 proposed in the above embodiment of the present application. For the specific embodiment, reference may be made to the above embodiment.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Out, Clockwise, Counterclockwise, Axial The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present application and the simplified description, and does not indicate or imply the indicated device or The elements must have a particular orientation, are constructed and operated in a particular orientation, and are therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present application, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless otherwise explicitly stated and defined. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood on a case-by-case basis.

In the present application, the first feature "on" or "below" the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the application. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Further, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without departing from the scope of the invention.

While the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the present application. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A charging device, comprising:

At least two sets of terminals, each of which includes: a positive terminal and a negative terminal;

And a controller that selectively controls one of the at least two sets of terminals to charge the device to be charged.
The charging device according to claim 1, wherein at least two sets of said terminals are vertically spaced apart, and between said positive terminal and said negative terminal in each set of said terminals Horizontal arrangement.
The charging device according to claim 1 or 2, further comprising: a body, the at least two sets of terminal blocks are mounted in the body, the body being at each of the positive electrode terminal and the negative electrode An air groove is disposed at the terminal, and an intake passage is formed on the body, and the intake passage is in communication with the air groove.
The charging device according to claim 3, wherein the air groove is provided around the positive terminal or the negative terminal.
The charging device according to claim 3, wherein the intake passage comprises: an intake port and a supply duct, the intake port being in communication with an external environment, the air supply duct being disposed on the body On the outer surface and in communication with the air groove.
The charging device according to claim 5, wherein said air supply duct is curved and communicates with each of said air grooves.
The charging device according to claim 5, wherein the upper surface of the body is provided with a downwardly recessed escape groove, and the escape groove is in communication with the air inlet and is also in communication with the air groove.
The charging device according to claim 7, wherein the escape groove extends in the axial direction of the body, and the air supply duct has a plurality of axial distributions on the body.
The charging device according to any one of claims 3-8, further comprising: a heat sink, the heat sink being attached to a rear surface of the body.
A charging device according to any one of claims 1-9, further comprising: a housing in which the body is located, the housing and the body being filled with a thermally conductive material.
The charging device according to claim 10, wherein the housing is formed with an injection hole for injecting a heat conductive material.
A charging device according to any one of claims 1 to 11, further comprising: a charging harness and a liquid metal phase change material cartridge, said charging harness being connected to said terminal, said liquid metal phase change material A sleeve is sleeved on the charging harness.
The charging device according to any one of claims 1 to 12, further comprising:

A relay control system for controlling a set of transmission currents of at least two sets of terminals.
The charging device according to claim 13, comprising two sets of terminals, wherein a positive terminal of the first one of the two sets of terminals is connected to the first resistor through the first controllable switch To a first positive output terminal of the charging power source, the negative terminal of the first group of terminals is connected to a first negative output terminal of the charging power source through a second controllable switch and a second resistor, wherein The positive terminal of the second group of terminals is connected to the second positive output of the charging power source through the third controllable switch and the third resistor, and the negative terminal of the second group of terminals passes the fourth controllable switch and the fourth The resistor is connected to the second negative output of the charging power source.
The charging device according to claim 14, wherein said third controllable switch and said fourth controllable switch are relays, said third controllable switch coils and said fourth controllable switch The coils are connected in series to form a relay coil branch, and the relay control system includes:

a transformer comprising a primary winding, a first secondary winding and a second secondary winding, wherein both ends of the primary winding are connected to an alternating current source;

a first rectifying and filtering unit, wherein two input ends of the first rectifying and filtering unit are connected to the first secondary winding, and a DC positive output end of the first rectifying and filtering unit is connected to one end of the relay coil branch ;

a first DC power source, the positive end of the first DC power source is connected to the other end of the relay coil branch, and the negative terminal of the first DC power source and the DC negative output of the first rectifying and filtering unit Connected to each other;

a first transistor, a collector of the first transistor is connected to a positive terminal of the first DC power source, an emitter of the first transistor and a negative terminal of the first DC power source Connected

a first bridge, the first bridge comprising a first bridge arm formed by a thermistor, a second bridge arm formed by a fifth resistor, a sixth bridge connected in series, and a third bridge arm formed by an adjustable potentiometer a fourth bridge arm composed of seven resistors, a node between the first bridge arm and the second bridge arm is connected to a base of the first triode, the third bridge arm and the fourth bridge a node between the arms is connected to an emitter of the first transistor;

a second rectifying and filtering unit, wherein two input ends of the second rectifying and filtering unit are connected to the second secondary winding, a DC positive output terminal of the second rectifying and filtering unit is coupled to the first bridge arm and the The nodes between the fourth bridge arms are connected, and the DC negative output terminal of the second rectifying and filtering unit is connected to the node between the second bridge arm and the third bridge arm.
The charging device according to claim 15, wherein said first bridge is in an equilibrium state by adjusting a magnitude of a resistance value of said adjustable potentiometer when said charging device does not start charging operation.
The charging device according to claim 16, wherein the thermistor is disposed corresponding to the first set of terminal blocks, wherein when the temperature of the first group of terminals is greater than a first temperature threshold, A relay control system controls the third controllable switch and the fourth controllable switch to close.
The charging device according to claim 17, wherein said controller controls said first controllable switch and said second controllable switch to close by said first when said charging means starts charging operation The group terminal transmits current, and detects the states of the third controllable switch and the fourth controllable switch in real time, and when the third controllable switch and the fourth controllable switch are closed, the delay is The first controllable switch and the second controllable switch are controlled to be disconnected after a predetermined time to transmit current through the second set of terminals.
A charging post characterized by comprising the charging device according to any one of claims 1-18.