TWI721285B - Charging device and charging pile - Google Patents

Abstract

The invention discloses a charging device and a charging pile, the charging device includes: at least two sets of terminals, each set of terminals including: positive terminal and negative terminal; the controller, the controller selectively controls a set of transmission currents in at least two groups of terminals. According to the charging device of the present invention, over-temperature of the connection terminal can be effectively prevented, thereby ensuring normal charging.

Description

Charging device and charging pile

The invention relates to the technical field of electric vehicles, in particular to a charging device and a charging pile.

At present, energy and environmental issues are driving the explosive growth of new energy vehicles, and the number of new energy vehicles continues to rise. Compared with traditional fuel vehicles, new energy vehicles have huge advantages in energy saving and environmental protection. However, electric vehicles, a key development item in new energy vehicles, have the defect of long charging time periods. At this stage, increasing the charging power to shorten the charging time of electric vehicles is one of the commonly used solutions, but the problem that comes with it is that the terminal of the charging interface is seriously heated, causing the terminal to burn out or charging failure, and the whole vehicle cannot be carried out. Charge normally.

The present invention aims to solve one of the technical problems in the above technology at least to a certain extent. To this end, an object of the present invention is to provide a charging device, which can effectively prevent overheating of the connection terminals, thereby ensuring normal charging.

The second objective of the present invention is to provide a charging pile.

In order to achieve the above objective, an embodiment of the first aspect of the present invention proposes a charging device, which includes: at least two sets of connecting terminals, each set of the connecting terminals includes: a positive terminal and a negative terminal; a controller, the controller is selective The ground controls at least one of the two sets of terminal blocks to transmit current.

According to the charging device of the embodiment of the present invention, by providing at least two sets of connecting terminals, and when the charging device is performing charging, by selecting one of the at least two sets of connecting terminals to transmit current, it is possible to prevent current transmission due to the same connecting terminal being used all the time. This leads to overheating of the connecting terminal, thus ensuring normal charging.

In order to achieve the above objective, an embodiment of the second aspect of the present invention provides a charging pile, which includes the charging device proposed in the embodiment of the first aspect of the present invention.

According to the charging pile of the embodiment of the present invention, it is possible to prevent the connection terminal from overheating due to always using the same connection terminal to transmit current, thereby ensuring normal charging.

The additional aspects and advantages of the present invention will be partly given in the following description, and partly will become obvious from the following description, or be understood through the practice of the present invention.

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

The charging device and the charging pile according to the embodiments of the present invention will be described below in conjunction with the drawings.

Figure 1 is a schematic block diagram of a charging device according to an embodiment of the present invention. As shown in Figure 1, the charging device of the embodiment of the present invention includes: at least two sets of connecting terminals 10 and a controller 20.

Wherein, each group of connection terminals 10 includes a positive connection terminal 11 and a negative connection terminal 12, and the controller 20 selectively controls one group of at least two groups of connection terminals 10 to transmit current.

In an embodiment of the present invention, the charging device may be arranged in a charging pile. The charging pile in the embodiment of the present invention may be a DC charging pile, which can convert AC power to DC to provide charging power for a device to be charged (such as an electric vehicle) connected to the charging pile.

Further, the positive terminal 11 of each set of terminal 10 is connected to the positive output terminal of the charging power source, and the negative terminal 12 is connected to the negative output terminal of the charging power source. The device to be charged may include a charging dock. When the charging device is connected to the charging dock, the charging power source can transmit current to the device to be charged through one of at least two sets of connection terminals 10 to charge the device to be charged.

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

Among them, as shown in Figure 2, the positive terminal DC1+ of the first group of connection terminals can be connected to the first positive output terminal a of the charging power supply through the first controllable switch K1 and the first resistor R1. The negative terminal DC1- can be connected to the first negative output terminal b of the charging power supply through the second controllable switch K2 and the second resistor R2, and the positive terminal DC2+ of the second group of terminals can be connected through the third controllable switch K3 and the second The three resistors R3 are connected to the second positive output terminal c of the charging power supply, and the negative terminal DC2- of the second set of terminals can be connected to the second negative output terminal d of the charging power supply through the fourth controllable switch K4 and the fourth resistor R4. .

In an embodiment of the present invention, referring to Figure 2, the terminal of the charging device can be set in the charging gun 1100 of the charging pile. 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 The connecting terminals of can be connected to the corresponding connecting terminals in the charging base 2100.

In an embodiment of the present invention, the third controllable switch K3 and the fourth controllable switch K4 may be relays. As shown in Figure 2, the charging device may also include a relay control system for controlling the relay. The controller 20 may include a delay circuit breaker, so that the control of the first controllable switch K1 and the second controllable switch K2 can be realized through the delay circuit breaker. As shown in Figure 2, the first to fourth controllable switches K1 to K4, the controller 20, the relay control system, the first to fourth resistors R1 to R4 and the charging power supply can all be set in the charging cabinet 1200 of the charging pile .

Further, as shown in Figure 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. The relay control system may include: a transformer 21, a first rectifying filter unit 22 , The first direct current power supply 23, the first triode 24, the first electric bridge 25 and the second rectifying and filtering unit 26.

As shown in Figure 3, the transformer 21 includes a primary winding, a first secondary winding, and a second secondary winding. The two ends of the primary winding are connected to an alternating current power supply (such as AC220V); the two inputs of the first rectifying and filtering unit 22 Terminal is connected to the first primary winding, the DC positive output terminal of the first rectification filter unit 22 is connected to one end of the relay coil branch; the positive terminal of the first DC power supply 23 is connected to the other end of the relay coil branch, the first straight The negative terminal of the current power supply 23 is connected to the DC negative output terminal of the first rectifying and filtering unit 22; the collector of the first triode 24 is connected to the positive terminal of the first DC power supply 23, and the emitter of the first triode 24 is Connected to the negative terminal of the first DC power supply 23; the first bridge 25 includes a first bridge arm composed of a thermistor RT, a second bridge arm composed of a fifth resistor R5, a sixth resistor R6 connected in series and an adjustable potential The third bridge arm formed by the device RP and the fourth 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 triode 24, and the third bridge arm is connected to the The node between the four bridge arms is connected to the emitter of the first triode 24; the two input ends of the second rectifying and filtering unit 26 are connected to the second primary winding, and the DC positive output end of the second rectifying and filtering unit 26 is connected to the first bridge The node between the arm and the fourth bridge arm is connected, and the DC negative output terminal of the second rectifying and filtering unit 26 is connected with the node between the second bridge arm and the third bridge arm.

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

Wherein, the thermistor RT can be set corresponding to the first set of connecting terminals, and the resistance value of the adjustable potentiometer RP is adjusted when the charging device does not start charging, so that the first electric bridge 25 is in a balanced state.

Based on the structures shown in Figures 2 and 3, the controller 20 can control the first controllable switch K1 and the second controllable switch K2 to be closed when the charging device starts charging, so as to pass the first set of connection terminals DC1+ and DC1- Transmission current. When the charging time of the charging device is relatively short, the temperature of the first group of connecting terminals is close to the ambient temperature, the resistance of the thermistor RT does not change much, and the first electric bridge 25 is still in a relatively balanced state. Therefore, the potential difference between the base and emitter of the first triode 24 is 0, the first triode 24 is in the off state, the relay coil branch is not energized, the third controllable switch K3 and the fourth controllable switch K4 is in the disconnected state. With the increase of the temperature of the first group of connecting terminals, the resistance of the thermistor RT continues to decrease, the first bridge 25 loses balance, the base current of the first triode 24 increases, and the collector current increases accordingly. . When the temperature of the first group of wiring terminals is greater than the first temperature critical value, the collector current increases 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 controllable switch K4 When closed, the second group of connection terminals and the first group of connection terminals simultaneously transmit current to the corresponding connection terminals in the charging dock 2100.

The controller 20 can instantly detect the states of the third controllable switch K3 and the fourth controllable switch K4, and control the first control when the third controllable switch K3 and the fourth controllable switch K4 are closed and the first preset time is delayed. The controllable switch K1 and the second controllable switch K2 are turned off to transmit current through the second set of connection terminals DC2+ and DC2-. Specifically, the resistance of the third resistor R3 and the fourth resistor R4 can be much larger than the resistance of the first resistor R1 and the second resistor R2. Therefore, the current transmitted by the charging power supply through the second set of connection terminals is relatively large, and The current transmitted through the first set of terminals is relatively small. After the third controllable switch K3 and the fourth controllable switch K4 are closed, and the second set of wiring terminals are connected to the output end of the charging power supply, the delay circuit breaker in the controller 20 delays the first preset time (such as 30s) to control the first A controllable switch K1 and a second controllable switch K2 are disconnected to switch to transmit current through the second group of connection terminals alone. Through the above-mentioned delayed disconnection strategy, it is possible to avoid arcing of the first group of wiring terminals when a large current is cut off.

According to the charging device of the embodiment of the present invention, by providing at least two sets of connecting terminals, and when the charging device is performing charging, by selecting one of the at least two sets of connecting terminals to transmit current, it is possible to prevent current transmission due to the same connecting terminal being used all the time. This leads to overheating of the connecting terminal, thus ensuring normal charging.

Further, as shown in Figures 4 to 7, in the charging device of the embodiment of the present invention, at least two sets of terminals 10 are vertically spaced apart, and the positive terminal and the negative terminal in each set of terminal 10 They are arranged horizontally (Figures 4 to 7 take the charging device including two sets of terminals as an example).

As shown in Figures 4 and 5, the charging device of the embodiment of the present invention may further include a body 30. At least two sets of terminals are installed in the body 30. The body 30 is provided with each positive terminal and negative terminal. In the air groove 31, an air inlet passage 32 is also formed on the main body 30, and the air inlet passage 32 is in communication with the air groove 31. In addition, the air groove 31 is also arranged around the positive terminal or the negative terminal.

Further, as shown in Figs. 6 and 7, the air intake passage 32 may include an air inlet 01 and an air duct 02. The air inlet 01 communicates with the external environment, and the air duct 02 is provided on the outer surface of the body 30 and It communicates with the air tank 31. In an embodiment of the present invention, the air supply channel 02 is arc-shaped and communicates with each air groove 31.

As shown in FIGS. 5 to 7, the upper surface of the main body 30 may be provided with an escape groove 33 recessed downward, and the escape groove 33 communicates with the air inlet 01 and also communicates with the air groove 31. The avoidance groove 33 extends in the axial direction of the main body 30, and the air supply channels 02 are plural and are distributed in the axial direction of the main body.

Therefore, by setting the air slot and the air inlet channel, after the charging device is connected to the device to be charged, air can enter and exit the body of the charging device and circulate in the air inlet channel (the arrow shown in Figure 7 can indicate air circulation Direction) to realize the cooling of the connection terminal, and the above structure of the embodiment of the present invention enables the connection terminal to have a larger contact area with the air, and the heat dissipation effect is relatively good, which can effectively prevent the connection terminal from overheating, thereby ensuring normal charging.

Further, as shown in Fig. 4, the charging device of the embodiment of the present invention 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. The body 50 and the body 30 are filled with a thermally conductive material. In addition, an injection hole 51 for injecting a thermally conductive material is formed on the housing 50. In a specific embodiment of the present invention, the thermally conductive material may be thermally conductive silicone, and the thermally conductive silicone is injected into the housing 50 through the injection hole 51, which can effectively conduct heat to the body 30; the heat sink 40 may be a graphite heat sink, which can maximize It absorbs the heat of the main body 30 and conducts the heat to the thermally conductive silicone.

In addition, as shown in Figure 4, the charging device of the embodiment of the present invention may further include a charging wire harness (not shown in the figure) and a liquid metal phase change material barrel 60. The charging wire harness is connected to the terminal, and the liquid metal phase change material barrel 60 60 sets are installed on the charging harness.

Thus, by arranging the heat sink and filling the heat-conducting material around the body, and by pre-filling the liquid metal into the ring-shaped liquid metal phase change material cylinder, and fixing it at the end of the body, the heat of the heat-conducting silicone can be absorbed, thereby effectively charging The device dissipates heat to further prevent overheating of the connection terminals, 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. It can not only prevent the terminal from overheating, but also does not have the risk of inducing leakage of the charging interface. High safety, reliability and practicality.

Corresponding to the charging device of the foregoing embodiment, a charging dock can be provided on the device to be charged. As shown in Figures 8 and 9, the charging base may include a charging base body 2110, and connecting terminals 2120 that are installed in the charging base body 2110 and correspond to the terminals of the charging device one-to-one, and can be rotated to open or close. A waterproof cover 2130 and a set of positive cables 2140 and a set of negative cables 2150 corresponding to the connection terminals 2120. The charging stand is matched with the charging device of the above-mentioned embodiment to realize charging of the plug-in gun of the electric vehicle.

In some of the foregoing embodiments, two groups of connecting terminals are used as an example. In other embodiments of the present invention, the implementation manner when there are more than two groups of connecting terminals can refer to the above-mentioned implementation of connecting terminals into two groups, which will not be repeated here.

Corresponding to the foregoing embodiment, the present invention also provides a charging pile.

As shown in FIG. 10, the charging pile 1000 according to the embodiment of the present invention includes the charging device 100 proposed in the above-mentioned embodiment of the present invention. For specific implementations, please refer to the above-mentioned embodiment.

According to the charging pile of the embodiment of the present invention, it is possible to prevent the connection terminal from overheating due to always using the same connection terminal to transmit current, thereby ensuring normal charging.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply the pointed device or element It must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, the "plurality" means two or more, unless it is specifically defined otherwise.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. , Or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediary, and it can be a connection between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

In the present invention, unless expressly stipulated and defined otherwise, the first feature “on” or “under” the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. contact. Moreover, the "above", "above" and "above" of the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or it simply means that the level of the first feature is higher than the second feature. The “below”, “below” and “below” of the second feature of the first feature may be that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example. , Structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in an appropriate manner in any or plural embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can comment on the above-mentioned embodiments within the scope of the present invention. The embodiment undergoes changes, modifications, substitutions, and modifications.

a‧‧‧First positive output terminal b‧‧‧First negative output terminal c‧‧‧Second positive output terminal d‧‧‧Second negative output terminal C1, C2, C3, C4‧‧‧Filter capacitor D1 D2, D3, D4‧‧‧Diode D5‧‧‧Rectifier diode D6‧‧‧First protection diode D7‧‧‧Second protection diode DC1+‧‧‧Positive terminal DC1-‧‧ ‧Negative terminal K1‧‧‧First controllable switch K2‧‧‧Second controllable switch K3‧‧‧Third controllable switch K4‧‧‧Fourth controllable switch R1‧‧‧First resistance R2‧‧ ‧Second resistor R3‧‧‧Third resistor R4‧‧‧Fourth resistor R5‧‧‧Fifth resistor R6‧‧‧Sixth resistor R7‧‧‧Seventh resistor R8‧‧‧Eighth resistor R9‧‧‧ Ninth resistor RP‧‧‧Adjustable potentiometer RT‧‧‧Thermistor 01‧‧‧Air inlet 02‧‧‧Air supply duct 10‧‧‧Terminal 11‧‧‧Positive terminal 12‧‧‧Negative terminal Terminal 20 ‧ ‧ Controller 21 ‧ ‧ Transformer 22 ‧ ‧ First rectifier filter unit 23 ‧ ‧ First DC power supply 24 ‧ ‧ First transistor 25 ‧ ‧ First bridge 26 ‧ ‧ ‧Second rectifier filter unit 30‧‧‧Body 31‧‧‧Air slot 32‧‧‧Air inlet channel 33‧‧‧Evasion groove 40‧‧‧Heat sink 50‧‧‧Shell 51‧‧‧Injection hole 60‧ ‧‧Liquid metal phase change material cylinder 100‧‧‧Charging device 1000‧‧‧Charging pile 1100‧‧‧Charging gun 1200‧‧‧Charging cabinet 2100‧‧‧Charging stand 2110‧‧‧Charging stand body 2120‧‧‧Wiring Terminal 2130‧‧‧Waterproof cover 2140‧‧‧One set of positive cable 2150‧‧‧One set of negative cable

Figure 1 is a schematic block diagram of a charging device according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a charging device according to an embodiment of the present invention; Figure 3 is a topology of a relay control system according to an embodiment of the present invention Figures; Figure 4 is a schematic diagram of the structure of a charging device according to an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of the body of the charging device according to an embodiment of the present invention; Figure 6 is a schematic diagram of another embodiment of the present invention A schematic diagram of the structure of the main body of the charging device; Fig. 7 is a schematic diagram of air circulation in the main body of the charging device according to an embodiment of the present invention; Fig. 8 is a schematic diagram of the structure of a charging stand according to an embodiment of the present invention; A front view of a charging stand according to an embodiment of the invention; Fig. 10 is a block diagram of a charging stand according to an embodiment of the invention.

10‧‧‧Terminal

11‧‧‧Positive terminal

12‧‧‧Negative terminal

20‧‧‧Controller

Claims (18)

A charging device is characterized by comprising: at least two sets of connecting terminals, each set of the connecting terminals includes: a positive connecting terminal and a negative connecting terminal; a controller, the controller selectively controls the at least two sets of connecting terminals One group of the at least two groups of connection terminals transmits current, and when the temperature of one group of the at least two groups of connection terminals is greater than a temperature critical value, switch to another group of the at least two groups of connection terminals to transmit current; and a thermistor, Corresponding to a set of terminal settings in at least two sets of wiring terminals, where: the controller includes a delay circuit breaker; the controller controls the delay circuit breaker to delay control the set of wiring terminals according to a resistance change of the thermistor The corresponding controllable switch is opened, and the controllable switch corresponding to the other group of wiring terminals is controlled to be closed. The charging device described in item 1 of the scope of patent application, wherein at least two groups of the connection terminals are vertically spaced apart, and the positive connection terminal and the negative connection terminal in each group of the connection terminal are arranged horizontally . The charging device according to item 1 of the scope of patent application, further comprising: a body, the at least two sets of terminals are installed in the body, and the body is provided with a body at each of the positive terminal and the negative terminal. An air groove, an air inlet passage is also formed on the body, and the air inlet passage communicates with the air groove. The charging device according to item 3 of the scope of patent application, wherein the air groove is arranged around the positive terminal or the negative terminal. The charging device according to item 3 of the scope of patent application, wherein the air inlet passage includes: an air inlet and an air supply duct, the air inlet is in communication with the external environment, and the air supply duct is arranged on the outer surface of the body And communicate with the air tank. According to the charging device described in item 5 of the scope of patent application, the air supply duct is arc-shaped and communicates with each of the air grooves. According to the charging device described in item 5 of the scope of patent application, the upper surface of the main body is provided with an escape groove recessed downward, and the escape groove communicates with the air inlet and also communicates with the air groove. The charging device according to item 7 of the scope of patent application, wherein the avoidance groove extends in the axial direction of the main body, and the air supply ducts are plural and are distributed in the axial direction of the main body. The charging device described in item 3 of the scope of patent application further includes a heat sink, which is attached to the rear surface of the main body. The charging device according to item 3 of the scope of patent application, further comprising: a casing, the main body is located in the casing, and a thermally conductive material is filled between the casing and the main body. According to the charging device described in item 10 of the scope of patent application, an injection hole for injecting a thermally conductive material is formed on the casing. The charging device as described in item 1 of the scope of patent application, further comprising: a charging wire harness and a liquid metal phase change material barrel, the charging wire harness is connected to the terminal, and the liquid metal phase change material barrel is sleeved on the On the charging harness. The charging device described in item 1 of the scope of patent application includes two sets of connecting terminals, wherein a positive terminal of a first set of connecting terminals in the two sets of connecting terminals passes through a first controllable switch and a The first resistor is connected to a first positive output terminal of the charging power supply, and the negative terminal of the first set of connection terminals is connected to a first negative output terminal of the charging power supply through a second controllable switch and a second resistor. A positive terminal of a second set of terminals in the two sets of terminal blocks is connected to a second positive output terminal of the charging power supply through a third controllable switch and a third resistor, and a negative terminal of the second set of terminals The connecting terminal is connected to a second negative output terminal of the charging power supply through a fourth controllable switch and a fourth resistor. The charging device according to item 13 of the scope of patent application, wherein the third controllable switch and the fourth controllable switch are a relay, and the coil of the third controllable switch and the coil of the fourth controllable switch are mutually connected. The relay coil branch is formed in series. The charging device also includes a relay control system. The relay control system includes a transformer including a primary winding, a first secondary winding and a second secondary winding, wherein the The two ends of the primary winding are connected to the AC power supply; a first rectifying and filtering unit, the two input ends of the first rectifying and filtering unit are connected to the first primary winding, and the DC positive output end of the first rectifying and filtering unit is connected to the relay coil One end of the branch is connected; a first DC power source, the positive terminal 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 is connected to the first rectifier filter unit The DC negative output terminal is connected; a first triode, the collector of the first triode is connected to the positive terminal of the first DC power source, and the emitter of the first triode is connected to the first DC power source The negative terminal is connected; a first bridge, the first bridge includes a first bridge arm formed by the thermistor, a second bridge arm formed by a fifth resistor, a sixth resistor connected in series and an adjustable potentiometer A fourth bridge arm formed by a third bridge arm and a seventh resistor, the node between the first bridge arm and the second bridge arm is connected to the base of the first triode, and the third bridge arm The node between the fourth bridge arm is connected to the emitter of the first triode; a second rectifying and filtering unit, the two input ends of the second rectifying and filtering unit are connected to the second primary winding, and the second rectifying and filtering unit is connected to the second primary winding. The DC positive output terminal of the filter unit is connected to the node between the first bridge arm and the fourth bridge arm, and the DC negative output terminal of the second rectification filter unit is connected to the node between the second bridge arm and the third bridge arm Connected. The charging device according to item 14 of the scope of patent application, wherein the first electric bridge is in a balanced state by adjusting the resistance value of the adjustable potentiometer when the charging device does not start charging. For example, the charging device described in item 15 of the scope of patent application, wherein the thermistor is arranged corresponding to the first group of connection terminals, wherein, when the temperature of the first group of connection terminals is greater than the first temperature critical value, the relay controls The system controls the third controllable switch and the fourth controllable switch to close. The charging device according to item 16 of the scope of patent application, wherein the controller controls the first controllable switch and the second controllable switch to be closed when the charging device starts charging, so as to transmit through the first set of connection terminals Current, and immediately detect the state of the third controllable switch and the fourth controllable switch, and when the third controllable switch and the fourth controllable switch are closed, the first preset time is delayed to control the first The controllable switch and the second controllable switch are disconnected to transmit current through the second set of connection terminals. A charging pile is characterized by comprising the charging device according to any one of items 1 to 17 of the scope of patent application.

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