Charging device and charging apparatus for charging an electric vehicle

Abstract

The application provides a charging device and a charging equipment for charging an electric vehicle. The charging device comprises a control unit, a switch matrix device and a direct current-direct current (DC-DC) module. The switch matrix device comprises a switch module. The control unit is used for controlling the opening and closing of the switch module to control the DC-DC module to charge the electric vehicle. The switch module comprises a first input end, a first output end, a semiconductor electronic switch device, a first switch device and a second switch device. The first input end is used for connecting a positive electrode of the DC-DC module. The first port of the semiconductor electronic switch device and the first port of the first switch device are connected with the first input end. The second port of the semiconductor electronic switch device is connected with the first port of the second switch device. The second port of the first switch device is connected with the first port or the second port of the second switch device. The second port of the second switch device is connected with the first output end. The first output end is used for power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy, in particular to a charging device and a charging equipment for charging an electric vehicle. BACKGROUND

[0002] In order to solve the charging problem of an electric vehicle (EV), one solution is to establish a charging system including a charging host and a switching matrix device. The charging host can convert mains into direct current that can be used by the electric vehicle. The switching matrix device includes a plurality of switching modules, each of which is used to provide the direct current output by the charging host to a charging gun in a turned-on state, so that the charging gun can charge the electric vehicle. Different switching modules can be used to supply power to different charging guns at the same time or to supply power to one charging gun at the same time.

[0003] The switching module in the above-mentioned switching matrix device is usually implemented by using a high-voltage direct-current contactor. However, the high-voltage direct-current contactor usually generates an arc phenomenon at the moment of closing or opening. Over time, this may cause damage to the switching contact, thereby causing the switching module to not work normally, and further affecting the performance of charging the EV.

[0004] Therefore, how to make the switching module in the switching matrix device not generate an arc at the moment of closing or opening has become a technical problem to be solved. SUMMARY

[0005] The present application provides a charging device and a charging equipment for charging an electric vehicle, which can make the switching module in the switching matrix device not generate an arc at the moment of closing or opening.

[0006] In a first aspect, the present application provides a charging device for charging an electric vehicle, including a control unit, a switching matrix device and a direct-current-direct-current (DC-DC) module, the switching matrix device including a switching module, the control unit being used to control the opening and closing of the switching module to control the DC-DC module to charge the electric vehicle; wherein the switching module includes a first input end, a first output end, a semiconductor electronic switching device, a first switching device and a second switching device; the first input end is used to connect the positive electrode of the DC-DC module, the first port of the semiconductor electronic switching device and the first port of the first switching device are connected with the first input end, the second port of the semiconductor electronic switching device is connected with the first port of the second switching device, the second port of the first switching device is connected with the first port or the second port of the second switching device, the second port of the second switching device is connected with the first output end, and the first output end is used to supply power.

[0007] In the present application, when the switch module in the switch matrix device adopts the above structure, the control unit can control the opening or closing of the semiconductor electronic switch device, the first switch device and the second switch device in sequence to realize that the switch module does not generate arc when opening or closing.

[0008] Specifically, to control the switch module not to generate arc when working (or referred to as the switch module being closed, being ON, being turned on), the implementation scheme is that the control unit controls the second switch device to be turned on first, then controls the semiconductor electronic switch device to be turned on, and then controls the first switch device to be turned on.

[0009] It can be understood that in this implementation scheme, when the control unit controls the second switch device to be turned on first, no current flows through the second switch device at this time, so that no arc occurs when the second switch device is turned on at this time.

[0010] It can be understood that when the semiconductor electronic switch device is turned on again, no arc occurs because the semiconductor switching element.

[0011] It can be understood that when the control unit controls the second switch device to be turned on and controls the semiconductor electronic switch device to be turned on, the voltage difference across the first switch device is almost zero at this time, so that no arc occurs when the first switch device is turned on at this time.

[0012] It can also be understood that when the control unit controls the second switch device to be turned on first, then controls the semiconductor electronic switch device to be turned on, and then controls the first switch device to be turned on, the switch module is in the turned-on state. It can also be known from the above description that no arc occurs in any of the switch devices in the turning-on process of the switch module, that is, the effect of no arc occurring in the switch module when being turned on is achieved.

[0013] Specifically, to control the switch module not to generate arc when not working (or referred to as the switch module being closed, being OFF, being not turned on), the implementation scheme is that the control unit controls the semiconductor electronic switch device to be turned on first, then controls the first switch device to be opened, then controls the semiconductor electronic switch device to be opened, and then controls the second switch device to be opened.

[0014] It can be understood that when the semiconductor electronic switch device is turned on, no arc occurs because the semiconductor electronic switch device is a semiconductor switching element when the semiconductor electronic switch device is turned on at this time.

[0015] It can be understood that when the control unit controls the semiconductor electronic switch device to be turned on, the voltage difference across the first switch device is almost zero at this time, so that no arc occurs when the first switch device is opened at this time.

[0016] It can be understood that when the semiconductor electronic switch device is controlled to be turned off, since the semiconductor electronic switch device is a semiconductor switching element, no arc will occur when the semiconductor electronic switch device is turned off.

[0017] It can be understood that when the control unit controls the semiconductor electronic switch device to be turned on, then controls the first switch device to be turned off, and then controls the semiconductor electronic switch device to be turned off, at this time, the current difference between the two ends of the second switch device is almost zero, so when the second switch device is turned off, no arc will occur.

[0018] It can be understood that when the control unit controls the semiconductor electronic switch device to be turned on, then controls the first switch device K1 to be turned off, then controls the semiconductor electronic switch device to be turned off, and then controls the second switch device K2 to be turned off, the switch module is in an open state. As can be known from the above description, during the opening process of the switch module, no arc occurs in any switch device, that is, the effect of no arc occurring when the switch module is opened is achieved.

[0019] Preferably, the semiconductor electronic switch device is a bidirectional electronic switch composed of two opposite IGBTs. In this case, the switch module in the matrix switch device provided by the embodiment can also support bidirectional current / power flow.

[0020] In combination with the first aspect, in a possible implementation manner, the control unit is specifically configured to: control the second switch device to be turned on, control the semiconductor electronic switch device to be turned on, and control the first switch device to be turned on, so as to control the switch module to be closed without generating an arc; wherein when the switch module is closed, the DC-DC module charges the electric vehicle.

[0021] In combination with the first aspect, in a possible implementation manner, the control unit is further configured to: after the first switch device is turned on, control the semiconductor electronic switch device to be turned off.

[0022] In combination with the first aspect, in a possible implementation manner, the control unit is specifically configured to: control the semiconductor electronic switch device to be turned on, control the first switch device to be turned off, control the semiconductor electronic switch device to be turned off, and control the second switch device to be turned off, so as to control the switch module to be opened without generating an arc; wherein when the switch module is opened, the DC-DC module is prohibited to charge the electric vehicle.

[0023] In combination with the first aspect, in a possible implementation manner, the third port of the second switch device is connected with a second input end of the switch module, and the fourth port of the second switch device is connected with a second output end of the switch module, the second input end is configured to be connected with a negative electrode of the DC-DC module, and the second output end is configured to supply power.

[0024] In a second aspect, the application provides a charging device for charging an electric vehicle, comprising a charging apparatus and a charging connecting apparatus, the charging apparatus being configured to charge the electric vehicle through the charging connecting apparatus; the charging apparatus comprising a control unit, a switch matrix apparatus and a direct current-direct current (DC-DC) module, the switch matrix apparatus comprising a switch module, the control unit being configured to control opening and closing of the switch module to control the charging apparatus to charge the electric vehicle; wherein the switch module comprises a first input end, a first output end, a semiconductor electronic switch device, a first switch device and a second switch device; the first input end being configured to be connected to a positive electrode of the DC-DC module, a first port of the semiconductor electronic switch device and a first port of the first switch device being connected to the first input end, a second port of the semiconductor electronic switch device being connected to a first port of the second switch device, a second port of the first switch device being connected to the first port or a second port of the second switch device, a second port of the second switch device being connected to the first output end, and the first output end being configured to supply power to the charging connecting apparatus.

[0025] With reference to the second aspect, in a possible implementation manner, the control unit is specifically configured to: control the second switch device to be turned on, control the semiconductor electronic switch device to be turned on, and control the first switch device to be turned on, so as to control the switch module to be closed without generating an electric arc, wherein the DC-DC module charges the electric vehicle when the switch module is closed.

[0026] With reference to the second aspect, in a possible implementation manner, the control unit is further configured to: control the semiconductor electronic switch device to be turned off after the first switch device is turned on.

[0027] With reference to the second aspect, in a possible implementation manner, the control unit is specifically configured to: control the semiconductor electronic switch device to be turned on, control the first switch device to be turned off, control the semiconductor electronic switch device to be turned off, and control the second switch device to be turned off, so as to control the switch module to be opened without generating an electric arc, wherein the DC-DC module is prohibited to charge the electric vehicle when the switch module is opened.

[0028] With reference to the second aspect, in a possible implementation manner, a third port of the second switch device is connected to a second input end of the switch module, and a fourth port of the second switch device is connected to a second output end of the switch module, the second input end being configured to be connected to a negative electrode of the DC-DC module, and the second output end being configured to supply power to the charging connecting apparatus.

[0029] In a third aspect, the present application provides a switching matrix device, comprising: a switching module and a control unit. The switching module comprises a first input terminal, a first output terminal, a top-contact semiconductor electronic switching device, a first switching device and a second switching device. The first input terminal is used for connecting a positive electrode of a direct current power supply. The first port of the top-contact semiconductor electronic switching device and the first port of the first switching device are both connected to the first input terminal. The second port of the top-contact semiconductor electronic switching device is connected to the first port of the second switching device. The second port of the first switching device is connected to the first port or the second port of the second switching device. The second port of the second switching device is connected to the first output terminal. The first output terminal is used for power supply. The control unit is used for controlling the top-contact semiconductor electronic switching device, the first switching device and the second switching device to be disconnected and connected.

[0030] In the present application, when the switching module in the switching matrix device adopts the above structure, the control unit can control the top-contact semiconductor electronic switching device, the first switching device and the second switching device to be disconnected or connected in a certain order, so that the switching module does not generate arc when being disconnected or connected.

[0031] Specifically, if the switching module is required to generate no arc when working (or referred to as the switching module being connected, being in ON, being in on), the implementation scheme is that the control unit controls the second switching device to be connected first, then controls the top-contact semiconductor electronic switching device to be connected, and then controls the first switching device to be connected.

[0032] It can be understood that in this implementation scheme, when the control unit controls the second switching device to be connected first, no arc is generated when the second switching device is connected at this time because no current flows through the second switching device at this time.

[0033] It can be understood that when the control unit controls the top-contact semiconductor electronic switching device to be connected, no arc is generated because the top-contact semiconductor electronic switching device is a semiconductor switching element.

[0034] It can be understood that when the control unit controls the second switching device to be connected and controls the top-contact semiconductor electronic switching device to be connected, the voltage difference between the two ends of the first switching device is almost zero at this time, so no arc is generated when the first switching device is connected at this time.

[0035] It can also be understood that when the control unit controls the second switching device to be connected first, then controls the top-contact semiconductor electronic switching device to be connected, and then controls the first switching device to be connected, the switching module is in the connected state. It can be known from the above description that no arc is generated in any of the switching devices in the connection process of the switching module, that is, the effect that no arc is generated when the switching module is connected is achieved.

[0036] Specifically, to control the switch module not to generate arc when the switch module is not working (or referred to as the switch module is closed, OFF, not conducting), the implementation is that the control unit first controls the top semiconductor electronic switch device to be turned on, then controls the first switch device to be turned off, then controls the top semiconductor electronic switch device to be turned off, and then controls the second switch device to be turned off.

[0037] It can be understood that when the top semiconductor electronic switch device is turned on, since the top semiconductor electronic switch device is a semiconductor switching element, no arc will occur when the top semiconductor electronic switch device is turned on.

[0038] It can be understood that after the control unit controls the top semiconductor electronic switch device to be turned on, the voltage difference between the two ends of the first switch device is almost zero at this time, so no arc will occur when the first switch device is turned off.

[0039] It can be understood that when the top semiconductor electronic switch device is turned off, since the top semiconductor electronic switch device is a semiconductor switching element, no arc will occur when the top semiconductor electronic switch device is turned off.

[0040] It can be understood that when the control unit first controls the top semiconductor electronic switch device to be turned on, then controls the first switch device to be turned off, and then controls the top semiconductor electronic switch device to be turned off, the current difference between the two ends of the second switch device is almost zero at this time, so no arc will occur when the second switch device is turned off.

[0041] It can be understood that when the control unit first controls the top semiconductor electronic switch device to be turned on, then controls the first switch device K1 to be turned off, then controls the top semiconductor electronic switch device to be turned off, and then controls the second switch device K2 to be turned off, the switch module is in an off state. It can also be known from the above description that during the off process of the switch module, no arc is generated in any switch device, that is, the effect of no arc occurring in the switch module when the switch module is off is achieved.

[0042] In addition, it should be noted that the switch module in the matrix switch device provided in the embodiment uses a top semiconductor electronic switch device, and therefore can also support bidirectional flow of current / power.

[0043] In combination with the third aspect, in a possible implementation manner, the control unit is further configured to: after the first switch device is turned on, control the top semiconductor electronic switch device to be turned off.

[0044] In combination with the third aspect, in a possible implementation manner, the second switch device is a double-pole single-throw relay or a double-pole double-throw relay; a third port of the second switch device is connected with a second input end of the device, and a fourth port of the second switch device is connected with a second output end of the device, the second input end being configured to be connected with a negative electrode of the direct-current power supply, and the second output end being configured to supply power.

[0045] In this embodiment, the second switch device is mainly used to realize electrical safety isolation of the first input end, the second input end and the output end.

[0046] In combination with the third aspect, in a possible implementation manner, the pair-top semiconductor electronic switch device is a pair-top insulated gate bipolar transistor (IGBT).

[0047] In combination with the third aspect, in a possible implementation manner, the pair-top semiconductor electronic switch device is a pair-top metal-oxide-semiconductor field-effect transistor (MOSFET) or a silicon carbide (SiC)-MOSFET. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 A structural schematic diagram of a charging system provided in the present application;

[0049] Figure 2 A structural schematic diagram of a high-voltage direct-current contactor provided in the present application;

[0050] Figure 3 A structural schematic diagram of a switch module provided in the present application;

[0051] Figure 4 A schematic diagram of a bidirectional electronic switch composed of two pair-top connected semiconductor electronic switch devices provided in the present application;

[0052] Figure 5 A structural schematic diagram of another switch module provided in the present application;

[0053] Figure 6 A structural schematic diagram of a charging device provided in the present application. DETAILED DESCRIPTION

[0054] In order to better introduce the technical scheme of the embodiments of the present application, some concepts used in the embodiments of the present application are introduced first.

[0055] 1. Arc

[0056] Arc is a common physical phenomenon in power systems and electric energy utilization engineering. In essence, it is a kind of gas discharge phenomenon, which is a transient spark generated when electric current passes through some insulating medium (such as air). External manifestations include: very bright brightness, very high temperature.

[0057] 2. Switch matrix device

[0058] A switch matrix device is a matrix used in charging piles at charging stations to achieve shared power. Reasonable power distribution is achieved through the switching of internal switch modules within the switch matrix device.

[0059] The charging device and charging equipment for charging electric vehicles provided in this application will now be described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0060] In recent years, under the dual pressures of energy conservation and environmental protection, electric vehicles (EVs) have become the main direction of future automotive development. To promote the integration of EVs into daily life, the charging problem for EVs needs to be solved.

[0061] One approach is to establish a charging system comprising a charging host or integrated charging pile and a switch matrix device. The charging host or integrated charging pile converts AC mains power into DC power usable by electric vehicles. The switch matrix device includes one or more switch modules, each of which, when switched on, supplies DC power from the charging host to the charging gun, enabling the charging gun to charge the electric vehicle. Different switch modules can simultaneously power different charging guns or a single charging gun to meet the charging power requirements of different vehicle models or the same vehicle at different times.

[0062] For example, Figure 1 This is a structural schematic diagram of a charging device provided in this application. Figure 1 As shown, the charging device includes a DC power supply and a switching matrix.

[0063] Among them, DC power supply devices such as Figure 1 The diagram shows the DC-DC1, DC-DC2, DC-DC3, and DC-DC4 modules. Typically, these four DC-DC modules can be located inside the charging host or the integrated charging station, and are used to convert the DC power obtained from the AC-DC module within a certain voltage range into DC power usable by the EV.

[0064] The switch matrix device includes multiple switch modules, such as... Figure 1 As shown, when each switch module is turned on, it can provide the DC power converted by the DC power supply device in the charging host or integrated charging pile to the charging connection device connected to it (the charging terminal shown in the figure, such as the charging pile), so that the charging pile can charge the EV.

[0065] Understandably, for Figure 1The charging device shown, the switch matrix device can be used to realize the power supply for different charging terminals at the same time or the power supply for one charging terminal at the same time by controlling different switch modules.

[0066] Exemplarily, when only one EV is connected to the charging terminal, for example, only one EV is currently connected to the charging terminal 1, the first switch module connected with the DC-DC1 module, the first switch module connected with the DC-DC2 module, the first switch module connected with the DC-DC3 module, and the first switch module connected with the DC-DC4 module can be controlled to be turned on at the same time, so that the charging terminal 1 can be supplied with power, thereby charging the electric vehicle connected with the charging terminal 1. Alternatively, part of the first switch module connected with the DC-DC1 module, the first switch module connected with the DC-DC2 module, the first switch module connected with the DC-DC3 module, and the first switch module connected with the DC-DC4 module can be controlled to be turned on, so that the charging terminal 1 can be supplied with power, thereby charging the electric vehicle connected with the charging terminal 1.

[0067] Exemplarily, when multiple EVs are connected to different charging terminals, for example, EVs are currently connected to the charging terminal 2 and the charging terminal 4 respectively, the second switch module connected with the DC-DC1 module, the second switch module connected with the DC-DC2 module, the second switch module connected with the DC-DC3 module, and the second switch module connected with the DC-DC4 module, and the fourth switch module connected with the DC-DC1 module, the fourth switch module connected with the DC-DC2 module, the fourth switch module connected with the DC-DC3 module, and the fourth switch module connected with the DC-DC4 module can be controlled to be turned on at the same time, so that the charging terminal 2 and the charging terminal 4 can be supplied with power at the same time, thereby charging the EV connected with the charging terminal 2 and charging the EV connected with the charging terminal 4.

[0068] At present, the switch module in the above-mentioned switch matrix device is usually realized by using a high-voltage DC contactor. Exemplarily, Figure 2 A structure diagram of a high-voltage DC contactor provided in the present application. The high-voltage DC contactor is a contactor used in a DC circuit, and whether the circuit controlled by the high-voltage DC contactor is turned on or not can be controlled by controlling the turn-on and turn-off of the high-voltage DC contactor.

[0069] However, the high-voltage DC contactor usually generates an arc phenomenon at the moment of closing or opening, which may cause damage to the switch contact points over a long period of time, so that the switch module cannot work normally, thereby affecting the performance of charging the EV.

[0070] Therefore, usually, when using the high-voltage DC contactor as the switch module in the switch matrix device as shown in the prior art, an additional arc extinguishing device is usually needed, which results in high cost and large size of the switch matrix device. Figure 1 In addition, when using the high-voltage DC contactor, the high-voltage DC contactor needs to be interconnected with the DC power module through a copper bar, which makes the production and manufacturing complex. Figure 1

[0071] Therefore, the present application provides a charging device for charging an electric vehicle and a charging equipment, so that the switch module in the switch matrix device does not generate an arc at the moment of closing or opening.

[0072] Specifically, the charging device for charging an electric vehicle provided by the present application comprises a control unit, a switch matrix device and a DC-DC module, wherein the switch matrix device comprises a switch module. The control unit is used to control the opening and closing of the switch module to control the DC-DC module to charge the electric vehicle.

[0073] More specifically, in the first embodiment, the switch module provided by the present application comprises a first input end, a first output end, a semiconductor electronic switch device K3, a first switch device K1 and a second switch device K2, as shown in the prior art. Figure 3

[0074] Specifically, in the present embodiment, the first input end is used to connect the positive pole of the DC power supply.

[0075] Specifically, in the present embodiment, the first input end is the positive input end of the positive input end and the negative input end included in the switch module. The positive input end included in the switch module is used to be connected with the positive pole of the DC power supply, and the negative input end included in the switch module is used to be connected with the negative pole of the DC power supply.

[0076] Specifically, in the present embodiment, the first input end is the positive input end of the positive input end and the negative input end included in the switch module. The positive input end included in the switch module is used to be connected with the positive pole of the DC power supply, and the negative input end included in the switch module is used to be connected with the negative pole of the DC power supply. Figure 1

[0077] Specifically, in the present embodiment, the first port of the semiconductor electronic switch device K3 and the first port of the first switch device K1 are connected with the first input end.

[0078] In the specific implementation, the first switch device K1 in the present embodiment can be a single-pole single-throw relay, which is mainly used for current conduction to avoid large loss when the current flows through the semiconductor electronic switch device K3.

[0079] Preferably, the semiconductor electronic switch device K3 in the present embodiment adopts a MOSFET. Figure 4 ​​​The bidirectional electronic switch shown by two antiparallel semiconductor electronic switching devices, also known as antiparallel semiconductor electronic switching devices, is used to realize zero-voltage closing or opening of the first switching device K1 and the second switching device K2, and the bidirectional electronic switch also supports bidirectional flow of current / power.

[0080] Exemplarily, in an embodiment, the semiconductor electronic switching device K3 can be considered as a bidirectional electronic switch composed of two antiparallel insulated gate bipolar transistors (IGBTs).

[0081] Exemplarily, in another embodiment, the semiconductor electronic switching device K3 can be considered as a bidirectional electronic switch composed of two antiparallel metal oxide semiconductor field effect transistors (MOSFETs). Alternatively, the semiconductor electronic switching device K3 can be considered as a bidirectional electronic switch composed of two antiparallel silicon carbide (Sic-MOSFETs).

[0082] Specifically, in the embodiment, the second port of the semiconductor electronic switching device K3 is connected to the first port of the second switching device K2, and the second port of the first switching device K1 is connected to the first port of the second switching device K2.

[0083] In specific implementation, the second switching device in the embodiment can be a double-pole single-throw relay or a double-pole double-throw relay to realize electrical isolation of the first and second input terminals and the output terminal after disconnection.

[0084] Specifically, when the second switching device is a double-pole single-throw relay or a double-pole double-throw relay, as shown in Figure 3 The third port of the second switching device K2 is connected to the second input terminal of the device, and the fourth port of the second switching device K2 is connected to the second output terminal of the switching module. Among them, the second input terminal is used to connect the negative electrode of the DC-DC (i.e. the second input terminal is the negative electrode among the positive electrode input terminal and the negative electrode input terminal included in the switching module), and the second output terminal is used for power supply (i.e. the second output terminal is the negative electrode among the positive electrode output terminal and the negative electrode output terminal included in the switching module).

[0085] Specifically, in the embodiment, the second port of the second switching device K2 is connected to the first output terminal, and the first output terminal is used for power supply.

[0086] Among them, the first output terminal is the positive electrode among the positive electrode output terminal and the negative electrode output terminal included in the switching module.

[0087] Specifically, in the embodiment, the control unit in the switch matrix device can control the opening and closing of the semiconductor electronic switch K3, the first switch K1 and the second switch K2, and by controlling the opening and closing (or on and off) of the semiconductor electronic switch K3, the first switch K1 and the second switch K2 in the order of the second switch K2, the semiconductor electronic switch K3 and the first switch K1, the effect of no arc produced when the switch module is opened or closed is achieved.

[0088] More specifically, in the embodiment, if the switch module shown in the figure is to be controlled to produce no arc when working (i.e. when the switch module is closed, or called when ON, or also called when turned on), the implementation is as follows: Figure 3

[0089] The control unit first controls the second switch K2 to be turned on, then controls the semiconductor electronic switch K3 to be turned on, and then controls the first switch K1 to be turned on.

[0090] It can be understood that when the control unit first controls the second switch K2 to be turned on, no arc will occur when the second switch K2 is turned on at this time because no current flows through the second switch K2 at this time, thereby achieving safe turn-on. In the embodiment, the switching of the second switch K2 in this state is also called zero current switching (ZCS).

[0091] It can be understood that when the control unit controls the semiconductor electronic switch K3 to be turned on, no arc will occur when the semiconductor electronic switch K3 is turned on because K3 is a semiconductor switching element.

[0092] It can be understood that when the control unit controls the second switch K2 to be turned on and controls the semiconductor electronic switch K3 to be turned on, the voltage difference across the first switch K1 at this time is almost zero, so no arc will occur when the first switch K1 is turned on at this time, thereby achieving safe turn-on. In the embodiment, the switching of the first switch K1 in this state is also called zero voltage switching (ZVS).

[0093] It can be understood that when the control unit controls the second switch K2 to be turned on first, then controls the semiconductor electronic switch K3 to be turned on, and then controls the first switch K1 to be turned on, the switch module is in the turned-on state. As known from the above description, during the turning-on process of the switch module, no arc is produced in any of the switches, i.e. the effect of no arc produced when the switch module is turned on is achieved.

[0094] ​In the embodiment, after the control unit controls the first switching device K1 to be on, the control unit controls the semiconductor electronic switching device K3 to be off, so that the semiconductor electronic switching device K3 works more reliably.

[0095] More specifically, in the embodiment, if the control unit wants to control Figure 3 As shown in the figure, the switching module does not generate arc when it is not working (i.e., when the switching module is off, or in OFF state, or in non-conducting state).

[0096] The control unit controls the semiconductor electronic switching device K2 to be on first, then controls the first switching device K1 to be off, then controls the semiconductor electronic switching device K3 to be off, and then controls the second switching device K2 to be off.

[0097] It can be understood that when the control unit controls the semiconductor electronic switching device K3 to be on, since K3 is a semiconductor switching element, the semiconductor electronic switching device K3 does not generate arc when it is on.

[0098] It can be understood that after the control unit controls the semiconductor electronic switching device K2 to be on, the voltage difference across the first switching device K1 is almost zero at this time, so that arc does not occur, thereby achieving safe disconnection.

[0099] It can be understood that when the control unit controls the semiconductor electronic switching device K3 to be off, since K3 is a semiconductor switching element, the semiconductor electronic switching device K3 does not generate arc when it is off.

[0100] It can be understood that after the control unit controls the semiconductor electronic switching device K3 to be on first, then controls the first switching device K1 to be off, and then controls the semiconductor electronic switching device K3 to be off, the current difference across the second switching device K2 is almost zero at this time, so that arc does not occur when the second switching device K2 is off at this time, thereby achieving safe disconnection.

[0101] It can be understood that after the control unit controls the semiconductor electronic switching device K3 to be on first, then controls the first switching device K1 to be off, then controls the semiconductor electronic switching device K3 to be off, and then controls the second switching device K2 to be off, the switching module is in the off state. As described above, during the disconnection process of the switching module, none of the switching devices generates arc, i.e., the effect of no arc generation when the switching module is off is achieved.

[0102] In the second embodiment, the application provides a switching module as shown in the figure, which includes a first input terminal, a first output terminal, a semiconductor electronic switching device K3, a first switching device K1, and a second switching device K2. Figure 5

[0103] ​Specifically, the second embodiment differs from the first embodiment in that, in the second embodiment, the second port of the first switching device K1 is connected to the second port of the second switching device K2.

[0104] That is, the second embodiment differs from the first embodiment in that, in the first embodiment, the semiconductor electronic switching device K3 is connected in parallel with the first switching device K1 and then connected in series with the second switching device K2, while in the second embodiment, the semiconductor electronic switching device K3 is connected in series with the second switching device K2 and then connected in parallel with the first switching device K1.

[0105] Specifically, in this embodiment, the control unit can also realize that the switching module does not generate electric arc when being switched on or off by controlling the opening and closing of the semiconductor electronic device K3, the first switching device K1 and the second switching device K2, and by controlling the sequence of opening or closing of the semiconductor electronic device K3, the first switching device K1 and the second switching device K2.

[0106] More specifically, in this embodiment, if the control unit wants to control the switching module to work without generating electric arc (i.e. when the switching module is switched on, or in other words, when the switching module is in the ON state, or in other words, when the switching module is in the on state), the control unit can realize this by: Figure 5

[0107] The control unit first controls the second switching device K2 to be on, then controls the semiconductor electronic switching device K3 to be on, and then controls the first switching device K1 to be on.

[0108] It can be understood that, when the control unit first controls the second switching device K2 to be on, no electric arc will occur when the second switching device K2 is turned on at this time, because there is no current flowing through the second switching device K2 at this time, thereby realizing safe switching on. Then, when the control unit controls the semiconductor electronic switching device K3 to be on, no electric arc will occur when the semiconductor electronic switching device K3 is turned on, because K3 is a semiconductor switching element.

[0109] When the control unit controls the second switching device K2 to be on and controls the semiconductor electronic switching device K3 to be on, the voltage difference between the two ends of the first switching device K1 is almost zero at this time, so no electric arc will occur when the first switching device K1 is turned on at this time, thereby realizing safe switching on. In this embodiment, the switching of the first switching device K1 in this state is also referred to as zero voltage switching (ZVS).

[0110] ​It can be understood that in the second embodiment, when the control unit controls the second switching device K2 to be turned on first, then controls the semiconductor electronic switching device K3 to be turned on, and then controls the first switching device K1 to be turned on, the switching module is in the on state. As can be known from the above description, during the on process of the switching module, no arc is generated in any of the switching devices, i.e., the effect of no arc generated in the on process of the switching module is achieved.

[0111] In the embodiment, after the control unit controls the first switching device K1 to be turned on, the control unit can further control the semiconductor electronic switching device K3 to be turned off, so that the semiconductor electronic switching device K3 works more reliably.

[0112] More specifically, in the embodiment, if it is required to control Figure 5 The switching module shown in the figure does not generate arc when it is not working (i.e., when the switching module is in the off state, or in the OFF state, or in the non-conduction state), and the implementation is as follows:

[0113] The control unit controls the semiconductor electronic switching device K3 to be turned on first, then controls the first switching device K1 to be turned off, then controls the semiconductor electronic switching device K3 to be turned off, and then controls the second switching device K2 to be turned off.

[0114] It can be understood that when the semiconductor electronic switching device K3 is turned on, since K3 is a semiconductor switching element, no arc is generated when the semiconductor electronic switching device K3 is turned on. After the control unit controls the semiconductor electronic switching device K2 to be turned on, the voltage difference across the first switching device K1 is almost zero at this time, so no arc is generated when the first switching device K1 is turned off, thereby achieving safe turn-off of the first switching device K1.

[0115] It can be understood that when the semiconductor electronic switching device K3 is turned off, since K3 is a semiconductor switching element, no arc is generated. After the control unit controls the semiconductor electronic switching device K2 to be turned on first, then controls the first switching device K1 to be turned off, and then controls the semiconductor electronic switching device K3 to be turned off, the current difference across the second switching device K2 is almost zero at this time, so no arc is generated when the second switching device K2 is turned off, thereby achieving safe turn-off of the second switching device K2.

[0116] It can be understood that in the second embodiment, when the control unit controls the semiconductor electronic switching device K3 to be turned on first, then controls the first switching device K1 to be turned off, then controls the semiconductor electronic switching device K3 to be turned off, and then controls the second switching device K2 to be turned off, the switching module is in the off state. As can be known from the above description, during the off process of the switching module, no arc is generated in any of the switching devices, i.e., the effect of no arc generated in the off process of the switching module is achieved.

[0117] It needs to be noted that when the semiconductor electronic switching device K3 in the switching module provided by the embodiment is a top-contact semiconductor electronic switching device, the bidirectional flow of current / power can also be supported.

[0118] Exemplarily, when the electric energy stored in the charging connection device (charging pile) is relatively large and the electric energy of the DC-DC module is relatively small, at this time, the controller can provide electric energy for the DC-DC module by controlling the current to flow from the charging connection device to the DC-DC module. Specifically, in this scenario, when the controller provides electric energy for the DC-DC module by controlling the current to flow from the charging connection device to the DC-DC module, it is still to control the second switching device K2 to be turned on first, then control the semiconductor electronic switching device K3 to be turned on, and then control the first switching device K1 to be turned on.

[0119] As an optional embodiment, Figure 6 a schematic diagram of a charging device for charging an electric vehicle is provided.

[0120] As Figure 6 shown, the charging device includes a charging device (composed of a switching matrix device and a DC-DC module in the figure) and a charging connection device (such as each charging terminal shown in Figure 6 ).

[0121] The charging device can realize the charging of the electric vehicle through the charging connection device.

[0122] The switching matrix device in the charging device includes a plurality of switching modules, and the structure of each first switching module is the structure of the embodiment shown in the foregoing description of the embodiment of the present application. It needs to be noted that in this figure, only K3 (i.e. IGBT marked in Figure 3 ) in the embodiment shown in Figure 3 is drawn above K1, but its principle is exactly the same as the description in the embodiment shown in Figure 5 , and here is not described again. Figure 3

[0123] As Figure 6 shown, Figure 6 DC / DC-1, DC / DC-2, …, DC / DC-n-1 and DC / DC-n in can convert the direct current in the first voltage range into direct current in the second voltage range and output from the second port.

[0124] That is, in the charging device, the input of the DC / DC module is direct current in the first voltage range, the output is direct current in the second voltage range, and the direct current in the second range is output through the second port (also referred to as the port of the output end of the DC / DC).

[0125] Specifically, in the embodiment, the second port of the DC / DC module is connected with the input end of the switch module.

[0126] The input end of the switch module is the first input end and the second input end in the foregoing embodiment. Specifically, the connection of the DC / DC module with the input end of the switch module means that the second port of the DC / DC module includes a port of the positive output end and a port of the negative output end, wherein the port of the positive output end in the second port of the DC / DC module is connected with the first input end of the switch module, and the port of the negative output end in the second port of the DC / DC module is connected with the second input end of the switch module.

[0127] In the charging device, the switch module can be controlled to be closed without generating an electric arc by controlling the second switch device K2 to be turned on, then controlling the semiconductor electronic switch device K3 to be turned on, and then controlling the first switch device K1 to be turned on, wherein the DC-DC module charges the electric vehicle when the switch module is closed.

[0128] In the charging device, after the first switch device K1 is turned on, the semiconductor electronic switch device K3 can also be controlled to be turned off.

[0129] In the charging device, the switch module can also be controlled to be opened without generating an electric arc by controlling the semiconductor electronic switch device K3 to be turned on, then controlling the first switch device K1 to be turned off, then controlling the semiconductor electronic switch device K3 to be turned off, and then controlling the second switch device K2 to be turned off, wherein the DC-DC module prohibits charging the electric vehicle when the switch module is opened.

[0130] It should be understood that the term “and / or” in this document merely describes an association relationship of associated objects, and indicates that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, wherein A and B can be singular or plural. In addition, the character “ / ” in this document generally represents that the front and rear associated objects are in an “or” relationship, but can also represent an “and / or” relationship, which can be understood according to the context before and after.

[0131]

[0132] In this application, “at least one” means one or more, and “multiple” means two or more. “At least one of the following” or the like means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.​

[0133] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any skilled practitioners may apply.

[0134] Those skilled in the art can easily conceive of variations or substitutions within the scope of the technology disclosed in this application, and all such variations or substitutions should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging device for charging an electric vehicle, comprising a control unit, a switch matrix device and a direct current-direct current (DC-DC) module, wherein the switch matrix device comprises a switch module, and the control unit is configured to control opening and closing of the switch module to control the DC-DC module to charge the electric vehicle. The first input end is configured to be connected to a positive electrode of the DC-DC module, a first port of the semiconductor electronic switch device and a first port of the first switch device are both connected to the first input end, a second port of the semiconductor electronic switch device is connected to a first port of the second switch device, a second port of the first switch device is connected to a first port or a second port of the second switch device, a second port of the second switch device is connected to the first output end, and the first output end is configured to supply power. The control unit is specifically configured to: control the second switch device to be turned on, control the semiconductor electronic switch device to be turned on, and control the first switch device to be turned on, so as to control the switch module to be closed without generating an electric arc; and the DC-DC module charges the electric vehicle when the switch module is closed. The control unit is further configured to: control the semiconductor electronic switch device to be turned off after the first switch device is turned on.

2. The charging device of claim 1, wherein, The control unit is specifically configured to: control the semiconductor electronic switch device to be turned on first, then control the first switch device to be turned off, then control the semiconductor electronic switch device to be turned off, and then control the second switch device to be turned off, so as to control the switch module to be opened without generating an electric arc; and the DC-DC module is prohibited to charge the electric vehicle when the switch module is opened.

5. The charging device according to any one of claims 1 to 4, wherein a third port of the second switch device is connected to a second input end of the switch module, a fourth port of the second switch device is connected to a second output end of the switch module, the second input end is configured to be connected to a negative electrode of the DC-DC module, and the second output end is configured to supply power. The charging device charges the electric vehicle through the charging connection device.

3. The charging device of claim 2, wherein, The charging device comprises a control unit, a switch matrix device and a DC-DC module, the switch matrix device comprises a switch module, and the control unit is configured to control opening and closing of the switch module to control the charging device to charge the electric vehicle. The first input end is configured to be connected to a positive electrode of the DC-DC module, a first port of the semiconductor electronic switch device and a first port of the first switch device are both connected to the first input end, a second port of the semiconductor electronic switch device is connected to a first port of the second switch device, a second port of the first switch device is connected to a first port or a second port of the second switch device, a second port of the second switch device is connected to the first output end, and the first output end is configured to supply power.

4. The charging device of claim 3, wherein, ​ ​ ​ ​ ​ 6. A charging device for charging an electric vehicle, comprising a charging apparatus and a charging connection apparatus, characterized in that ​ ​ ​ The first input end is used for connecting a positive pole of the DC-DC module, the first port of the semiconductor electronic switching device and the first port of the first switching device are connected with the first input end, the second port of the semiconductor electronic switching device is connected with the first port of the second switching device, the second port of the first switching device is connected with the first port or the second port of the second switching device, the second port of the second switching device is connected with the first output end, and the first output end is used for supplying power for the charging connection device.

7. The charging apparatus according to claim 6, characterized by, The control unit is specifically used for: controlling the second switching device to be turned on, controlling the semiconductor electronic switching device to be turned on, and controlling the first switching device to be turned on, so as to control the switch module to be closed without generating electric arc, wherein the DC-DC module charges the electric vehicle when the switch module is closed.

8. The charging apparatus according to claim 7, characterized by, The control unit is further used for: controlling the semiconductor electronic switching device to be turned off after the first switching device is turned on.

9. The charging apparatus according to claim 8, characterized by, The control unit is specifically used for: controlling the semiconductor electronic switching device to be turned on, controlling the first switching device to be turned off, controlling the semiconductor electronic switching device to be turned off, and controlling the second switching device to be turned off, so as to control the switch module to be opened without generating electric arc, wherein the DC-DC module prohibits charging the electric vehicle when the switch module is opened.

10. The charging device according to any one of claims 6 to 9, characterized in that, The third port of the second switching device is connected with a second input end of the switch module, the fourth port of the second switching device is connected with a second output end of the switch module, the second input end is used for connecting a negative pole of the DC-DC module, and the second output end is used for supplying power for the charging connection device.

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