Power supply device and vehicle

Abstract

The invention discloses a power supply device and a vehicle. The power supply device comprises a first switch module, an AC-DC conversion module and a control module, the first switch module comprises a first diode, a first relay, a second relay and a third relay, the first end of the first relay is connected with the first alternating current end, the second end of the first relay is connected with the positive electrode of the first diode, and the negative electrode of the first diode is connected with the first end of the alternating current-direct current conversion module; the first end of the second relay is connected with the first end of the first relay or the second end of the first relay, the second end of the second relay is connected with the negative electrode of the first diode, the first end of the third relay is connected with the second AC end, and the second end of the third relay is connected with the second end of the AC-DC conversion module; and the control module is used for controlling the states of the first relay, the second relay and the third relay, so that the current of the power supply device is switched from flowing through the first diode to flowing through the second relay. The safety of the power supply device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a power supply device and a vehicle. Background Art

[0002] With the development of electric vehicles, the functions of on-board power supplies are increasing. However, when the relay of the on-board power supply is energized, it is easy to generate a surge current, causing the relay to stick, which will result in the circuit of the on-board power supply not being completely disconnected, resulting in safety risks. Summary of the invention

[0003] The embodiments of the present application provide a power supply device and a vehicle, which can improve the safety of the power supply device.

[0004] A first aspect of an embodiment of the present application provides a power supply device, including a first switch module, an AC-DC conversion module and a control module; a first end of the first switch module is connected to a first AC end, a second end of the first switch module is connected to a second AC end, a third end of the first switch module is connected to the first end of the AC-DC conversion module, and a fourth end of the first switch module is connected to the second end of the AC-DC conversion module;

[0005] The first switch module includes a first diode, a first relay, a second relay and a third relay, wherein a first end of the first relay is connected to the first AC end, a second end of the first relay is connected to the anode of the first diode, a cathode of the first diode is connected to the first end of the AC-DC conversion module, a first end of the second relay is connected to the first end of the first relay or the second end of the first relay, a second end of the second relay is connected to the cathode of the first diode, a first end of the third relay is connected to the second AC end, and a second end of the third relay is connected to the second end of the AC-DC conversion module;

[0006] The control module is used to control the states of the first relay, the second relay and the third relay so that the current of the power supply device switches from flowing through the first diode to flowing through the second relay.

[0007] In an embodiment of the present application, in the process of the current of the power supply device switching from flowing through the first diode to flowing through the second relay, the voltage across the second relay is clamped by the first diode, and no current shock is generated when the current of the power supply device passes through the second relay, and the second relay will not stick, thereby improving the safety of the power supply device.

[0008] Optionally, the control module is used to control the states of the first relay, the second relay and the third relay so that the current of the power supply device switches from flowing through the first diode to flowing through the second relay, including:

[0009] The control module is used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to AC power, so that the power supply device is in a charging state, and the charging current of the power supply device is switched from flowing through the first diode to flowing through the second relay.

[0010] In the embodiment of the present application, the power supply device is in a charging state, that is, the power supply device charges the DC load through the AC-DC conversion module. The DC load may be a battery on a vehicle (for example, a power battery or a storage battery). The embodiment of the present application may be applied to Figures 1 to 4 Any power supply device.

[0011] When the power supply device charges the DC load through the AC-DC conversion module, the charging current of the power supply device can be switched from flowing through the first diode to flowing through the second relay by controlling the conduction timing of the first relay, the second relay and the third relay. In the process of switching the charging current of the power supply device from flowing through the first diode to flowing through the second relay, the voltage across the second relay is clamped by the first diode, and no current shock is generated when the charging current of the power supply device passes through the second relay, and the second relay does not stick, thereby improving the safety of the power supply device.

[0012] Optionally, the control module is used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to AC power, so that the power supply device is in a charging state, and the charging current of the power supply device is switched from flowing through the first diode to flowing through the second relay, including:

[0013] The control module is used to control the first relay and the third relay to be attracted, and control the second relay to be disconnected when the first AC end and the second AC end are connected to AC power and it is detected that the voltage between the first AC end and the second AC end is in a negative half cycle, and to control the second relay to be attracted when it is detected that the voltage between the first AC end and the second AC end switches from the negative half cycle to the positive half cycle, so that the power supply device is in a charging state, and the charging current of the power supply device switches from flowing through the first diode to flowing through the second relay; wherein, when the voltage between the first AC end and the second AC end is in a negative half cycle, the first diode is in a cut-off state, and when the voltage between the first AC end and the second AC end is in a positive half cycle, the first diode is in a conducting state.

[0014] In the embodiment of the present application, when the power supply device charges the DC load through the AC-DC conversion module, the first relay and the third relay can be controlled to be energized when the first diode is in the cut-off state, and no current passes through the first relay and the third relay when they are turned on. The second relay is controlled to be energized when the first diode is in the on state, and the voltage across the second relay is clamped by the first diode when the second relay is energized. When the charging current of the power supply device passes through the second relay, no current surge is generated, and the second relay will not be stuck, thereby improving the safety of the power supply device. When the voltage between the first AC terminal and the second AC terminal switches from the negative half cycle to the positive half cycle, the voltage of the AC power is at the zero point when the first diode is turned on (the voltage of the AC power changes from less than 0 to greater than 0), the first relay will not generate surge current, and the first relay will not have a sticking failure. The embodiment of the present application can be applied to Figures 1 to 4 Any power supply device.

[0015] Optionally, the control module is further used to control the disconnection timing of the first relay, the second relay and the third relay when the power supply device is in the charging state, so that the power supply device is in the charging disconnection state.

[0016] Optionally, the control module is further used to control the disconnection timing of the first relay, the second relay and the third relay when the power supply device is in the charging state, so that the power supply device is in the charging disconnection state, including:

[0017] The control module is also used to control the second relay to disconnect when the power supply device is in the charging state; and to control the first relay and the third relay to disconnect when the second relay is disconnected and the first diode is detected to be in the cut-off state, so as to put the power supply device in the charging disconnection state.

[0018] In an embodiment of the present application, when the second relay is disconnected, the voltage across the second relay is clamped by the first diode, and the current is transferred from the second relay to the first diode. When the second relay is disconnected and the first diode is in the cut-off state, the first relay and the third relay are controlled to be disconnected, so that when the first relay is disconnected, no current passes through the first relay, the first relay will not generate impact current, and the first relay will not have a sticking failure.

[0019] Optionally, the control module is used to control the states of the first relay, the second relay and the third relay so that the current of the power supply device switches from flowing through the first diode to flowing through the second relay, including:

[0020] The control module is used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to a first AC load, so that the power supply device is in a first discharge state, and the discharge current of the power supply device is switched from flowing through the first diode to flowing through the second relay.

[0021] In the embodiment of the present application, the power supply device is in the first discharge state, that is, the power supply device discharges to the first AC load through the AC-DC conversion module. The first AC load may be an AC load on the AC power grid.

[0022] When the power supply device discharges to the first AC load through the AC-DC conversion module, the discharge current of the power supply device can be switched from flowing through the first diode to flowing through the second relay by controlling the conduction timing of the first relay, the second relay, and the third relay. In the process of the discharge current of the power supply device switching from flowing through the first diode to flowing through the second relay, the voltage across the second relay is clamped by the first diode, and no current shock is generated when the discharge current of the power supply device passes through the second relay, and the second relay will not stick, thereby improving the safety of the power supply device. The embodiments of the present application can be applied to Figures 1 to 4 Any power supply device.

[0023] Optionally, the control module is further used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to a first AC load, so that the power supply device is in a first discharge state, and the discharge current of the power supply device is switched from flowing through the first diode to flowing through the second relay, including:

[0024] The control module is further used for controlling the first relay and the third relay to be attracted, and controlling the second relay to be disconnected when the first AC end and the second AC end are connected to a first AC load and detecting that the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a positive half cycle, and controlling the second relay to be attracted when detecting that the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module switches from the positive half cycle to the negative half cycle, so that the power supply device is in a first discharge state, and the discharge current of the power supply device switches from flowing through the first diode to flowing through the second relay; wherein, when the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a positive half cycle, the first diode is in a cut-off state, and when the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a negative half cycle, the first diode is in a conducting state.

[0025] In the embodiment of the present application, when the power supply device discharges to the first AC load through the AC-DC conversion module, the first relay and the third relay can be controlled to be attracted when the first diode is in the off state, and no current passes when the first relay and the third relay are turned on. When the first diode is in the on state, the second relay is controlled to be attracted, and the voltage at both ends of the second relay is clamped by the first diode when the second relay is attracted, and when the discharge current of the power supply device passes through the second relay, no current impact will be generated, and the second relay will not be adhered, thereby improving the safety of the power supply device. When the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is switched from the positive half cycle to the negative half cycle, when the first diode is turned on, the voltage between the second end of the AC-DC conversion module and the first end of the AC-DC conversion module is at the zero point (the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module changes from greater than 0 to less than 0), the first relay will not generate impact current, and the first relay will not have a adhesion failure.

[0026] The embodiments of the present application can be applied to Figures 1 to 4 Any power supply device.

[0027] Optionally, the control module is further used to control the disconnection timing of the first relay, the second relay and the third relay when the power supply device is in the first discharge state, so that the power supply device is in the first discharge disconnection state.

[0028] Optionally, the control module is further used to control the disconnection timing of the first relay, the second relay and the third relay when the power supply device is in the first discharge state, so that the power supply device is in the first discharge disconnection state, including:

[0029] The control module is also used to control the second relay to be disconnected when the power supply device is in the first discharge state; and to control the first relay and the third relay to be disconnected when the second relay is disconnected and the first diode is detected to be in the cut-off state, so as to put the power supply device in the first discharge disconnection state.

[0030] In an embodiment of the present application, when the second relay is disconnected, the voltage across the second relay is clamped by the first diode, and the current is transferred from the second relay to the first diode. When the second relay is disconnected and the first diode is in the cut-off state, the first relay and the third relay are controlled to be disconnected, so that when the first relay is disconnected, no current passes through the first relay, the first relay will not generate impact current, and the first relay will not have a sticking failure.

[0031] Optionally, the power supply device further includes a second switch module, a first end of the second switch module is connected to a third AC end, a second end of the second switch module is connected to a fourth AC end, a third end of the second switch module is connected to a first end of the AC-DC conversion module, and a fourth end of the second switch module is connected to a second end of the AC-DC conversion module;

[0032] The second switch module includes a second diode, a fourth relay, a fifth relay and a sixth relay, wherein a first end of the fourth relay is connected to the first AC end, a second end of the fourth relay is connected to the anode of the second diode, a cathode of the second diode is connected to the first end of the AC-DC conversion module, a first end of the fifth relay is connected to the first end of the fourth relay or the second end of the fourth relay, a second end of the fifth relay is connected to the cathode of the second diode, a first end of the sixth relay is connected to the second AC end, and a second end of the sixth relay is connected to the second end of the AC-DC conversion module;

[0033] The control module is further used to control the states of the fourth relay, the fifth relay and the sixth relay so that the current of the power supply device switches from flowing through the second diode to flowing through the fifth relay.

[0034] In an embodiment of the present application, in the process of the current of the power supply device switching from flowing through the second diode to flowing through the fifth relay, the voltage across the fifth relay is clamped by the second diode, and no current shock will be generated when the current of the power supply device passes through the fifth relay, and the fifth relay will not stick, thereby improving the safety of the power supply device.

[0035] Optionally, the control module is further used to control the states of the fourth relay, the fifth relay and the sixth relay so that the current of the power supply device switches from flowing through the second diode to flowing through the fifth relay, including:

[0036] The control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the power supply device is in a charging state and the third AC terminal and the fourth AC terminal are connected to a second AC load, so that the power supply device is in a charging state and a second discharging state, and the discharge current of the power supply device is switched from flowing through the second diode to flowing through the fifth relay.

[0037] In the embodiment of the present application, the power supply device is in a charging state and a second discharging state, that is, the power supply device charges the DC load through the AC-DC conversion module, and at the same time, the power supply device transmits the AC power of the first AC end and the second AC end to the third AC end and the fourth AC end by controlling the states of the first relay, the second relay, the third relay, the fourth relay, the fifth relay and the sixth relay. That is, the power supply device is in a charging state and a second discharging state at the same time. The DC load can be a battery on the vehicle (for example, a power battery or a storage battery), and the second AC load can be an electrical appliance that uses AC power (for example, a microwave oven, an induction cooker, a kettle, etc.).

[0038] When the power supply device transmits the AC power from the first AC terminal and the second AC terminal to the third AC terminal and the fourth AC terminal by controlling the states of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, and the sixth relay, the discharge current of the power supply device can be switched from flowing through the second diode to flowing through the fifth relay by controlling the conduction timing of the fourth relay, the fifth relay, and the sixth relay. In the process of the discharge current of the power supply device switching from flowing through the second diode to flowing through the fifth relay, the voltage across the fifth relay is clamped by the second diode, and no current shock is generated when the discharge current of the power supply device passes through the fifth relay, and the fifth relay does not stick, thereby improving the safety of the power supply device. The embodiments of the present application can be applied to Figure 2 or Figure 4 power supply unit.

[0039] Optionally, the control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the power supply device is in a charging state and the third AC end and the fourth AC end are connected to a second AC load, so that the power supply device is in a charging state and a second discharging state, and the discharge current of the power supply device is switched from flowing through the second diode to flowing through the fifth relay, including:

[0040] The control module is also used to control the fourth relay and the sixth relay to be attracted, and the fifth relay to be disconnected when the power supply device is in the charging state, the third AC terminal and the fourth AC terminal are connected to the second AC load, and it is detected that the voltage between the first AC terminal and the second AC terminal is in the positive half cycle, and to control the fifth relay to be attracted when it is detected that the voltage between the first AC terminal and the second AC terminal switches from the positive half cycle to the negative half cycle, so that the power supply device is in the charging state and the second discharging state, and the discharge current of the power supply device switches from flowing through the second diode to flowing through the fifth relay; wherein, when the voltage between the first AC terminal and the second AC terminal is in the positive half cycle, the second diode is in the cut-off state, and when the voltage between the first AC terminal and the second AC terminal is in the negative half cycle, the second diode is in the on state.

[0041] In the embodiment of the present application, when the power supply device discharges to the second AC load through the AC-DC conversion module, the fourth relay and the sixth relay can be controlled to be energized when the first diode is in the cut-off state, and no current passes through the fourth relay and the sixth relay when they are turned on. The fifth relay is controlled to be energized when the second diode is in the on state, and the voltage across the fifth relay is clamped by the second diode when the fifth relay is energized. When the discharge current of the power supply device passes through the fifth relay, no current shock will be generated, and the fifth relay will not be stuck, thereby improving the safety of the power supply device. When the voltage between the first AC terminal and the second AC terminal switches from the positive half cycle to the negative half cycle, the voltage between the first AC terminal and the second AC terminal is at the zero point (the voltage between the first AC terminal and the second AC terminal changes from greater than 0 to less than 0), the fourth relay will not generate shock current, and the fourth relay will not have a sticking failure. The embodiment of the present application can be applied to Figure 2 or Figure 4 power supply unit.

[0042] Optionally, the control module is further used to control the states of the fourth relay, the fifth relay and the sixth relay so that the current of the power supply device switches from flowing through the second diode to flowing through the fifth relay, including:

[0043] The control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the third AC end and the fourth AC end are connected to the second AC load, so that the power supply device is in a third discharge state, and the discharge current of the power supply device is switched from flowing through the second diode to flowing through the fifth relay.

[0044] In the embodiment of the present application, the power supply device is in the third discharge state, that is, the power supply device discharges to the second AC load through the AC-DC conversion module. The second AC load may be an appliance using AC power (eg, a microwave oven, an induction cooker, a kettle, etc.).

[0045] When the power supply device discharges to the second AC load through the AC-DC conversion module, the discharge current of the power supply device can be switched from flowing through the second diode to flowing through the fifth relay by controlling the conduction timing of the fourth relay, the fifth relay, and the sixth relay. In the process of the discharge current of the power supply device switching from flowing through the second diode to flowing through the fifth relay, the voltage across the fifth relay is clamped by the second diode, and no current shock is generated when the discharge current of the power supply device passes through the fifth relay, and the fifth relay will not stick, thereby improving the safety of the power supply device. The embodiments of the present application can be applied to Figure 2 or Figure 4 power supply unit.

[0046] Optionally, the control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the third AC end and the fourth AC end are connected to the second AC load, so that the power supply device is in a third discharge state, and the discharge current of the power supply device is switched from flowing through the second diode to flowing through the fifth relay, including:

[0047] The control module is further used for connecting a second AC load to the third AC end and the fourth AC end, and controlling the fourth relay and the sixth relay to be attracted, and controlling the fifth relay to be disconnected when it is detected that the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a positive half cycle, and controlling the fifth relay to be attracted when it is detected that the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module switches from the positive half cycle to the negative half cycle, so that the power supply device is in a third discharge state, and the discharge current of the power supply device switches from flowing through the second diode to flowing through the fifth relay; wherein, when the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a positive half cycle, the second diode is in a cut-off state, and when the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a negative half cycle, the second diode is in a conducting state.

[0048] In the embodiment of the present application, when the power supply device discharges to the second AC load through the AC-DC conversion module, the fourth relay and the sixth relay can be controlled to be energized when the first diode is in the cut-off state, and no current passes through when the fourth relay and the sixth relay are turned on. When the second diode is in the on state, the fifth relay is controlled to be energized, and the voltage across the fifth relay is clamped by the second diode when the fifth relay is energized. When the discharge current of the power supply device passes through the fifth relay, no current shock will be generated, and the fifth relay will not be stuck, thereby improving the safety of the power supply device. When the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module switches from the positive half cycle to the negative half cycle, when the second diode is turned on, the voltage between the second end of the AC-DC conversion module and the first end of the AC-DC conversion module is at the zero point (the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module changes from greater than 0 to less than 0), the fourth relay will not generate shock current, and the fourth relay will not have a sticking failure. The embodiment of the present application can be applied to Figure 2 or Figure 4 power supply unit.

[0049] Optionally, the control module is also used to control the disconnection timing of the fourth relay, the fifth relay and the sixth relay when the power supply device is in the second discharge state or the third discharge state, so that the power supply device is in the second discharge disconnection state or the third discharge disconnection state.

[0050] Optionally, the control module is further used to control the disconnection timing of the fourth relay, the fifth relay and the sixth relay when the power supply device is in the second discharge state or the third discharge state, so that the power supply device is in the second discharge disconnection state or the third discharge disconnection state, including:

[0051] The control module is also used to control the fifth relay to be disconnected when the power supply device is in the second discharge state or the third discharge state; and to control the fourth relay and the sixth relay to be disconnected when the fifth relay is disconnected and the second diode is detected to be in the cut-off state, so as to put the power supply device in the second discharge disconnection state or the third discharge disconnection state.

[0052] In an embodiment of the present application, when the fifth relay is disconnected, the voltage across the fifth relay is clamped by the second diode, and the current is transferred from the fifth relay to the second diode. When the fifth relay is disconnected and the second diode is in the cut-off state, the fourth relay and the sixth relay are controlled to be disconnected, so that when the fourth relay is disconnected, no current passes through the fourth relay, the fourth relay will not generate impact current, and the fourth relay will not have a adhesion failure.

[0053] A second aspect of the embodiments of the present application provides a vehicle, comprising a power supply device and a battery as described in any one of the first aspects of the embodiments of the present application.

[0054] In the power supply device of the embodiment of the present application, when the current of the power supply device switches from flowing through the first diode to flowing through the second relay, the voltage across the second relay is clamped by the first diode, and no current shock is generated when the current of the power supply device passes through the second relay, and the second relay does not stick, thereby improving the safety of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 is a structural schematic diagram of a power supply device provided in an embodiment of the present application;

[0057] Figure 2 is a structural schematic diagram of another power supply device provided in an embodiment of the present application;

[0058] Figure 3is a structural schematic diagram of another power supply device provided in an embodiment of the present application;

[0059] Figure 4 is a structural schematic diagram of another power supply device provided in an embodiment of the present application;

[0060] Figure 5 It is a schematic diagram of the relay conduction timing of a power supply device entering a charging state provided by an embodiment of the present application;

[0061] Figure 6 It is a schematic diagram of a relay conduction timing simulation result of a power supply device entering a charging state provided by an embodiment of the present application;

[0062] Figure 7 It is a schematic diagram of a relay conduction timing when a power supply device provided in an embodiment of the present application enters a second discharge state when in a charging state;

[0063] Figure 8 It is a schematic diagram of a relay conduction timing simulation result when a power supply device provided in an embodiment of the present application enters a second discharge state when in a charging state;

[0064] Fig. 9 It is a schematic diagram of a relay conduction timing when a power supply device enters a first discharge state provided by an embodiment of the present application;

[0065] Fig.10 It is a schematic diagram of a relay conduction timing simulation result of a power supply device entering a first discharge state provided by an embodiment of the present application;

[0066] Fig.11 It is a schematic diagram of a relay conduction timing when a power supply device enters a third discharge state provided by an embodiment of the present application;

[0067] Fig.12 It is a schematic diagram of a relay conduction timing simulation result of a power supply device entering a third discharge state provided by an embodiment of the present application;

[0068] Fig.13 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0070] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, products or devices.

[0071] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0072] See also Figure 1 , Figure 1 Schematic diagram of a power supply device provided in an embodiment of the present application. Figure 1 As shown, the power supply device includes a first switch module 10, an AC-DC conversion module 20 and a control module 30; a first end of the first switch module 10 is connected to a first AC end, a second end of the first switch module 10 is connected to a second AC end, a third end of the first switch module 10 is connected to a first end of the AC-DC conversion module 20, and a fourth end of the first switch module 10 is connected to a second end of the AC-DC conversion module 20;

[0073] The first switch module 10 includes a first diode D1, a first relay S1, a second relay S2 and a third relay S3, wherein a first end of the first relay S1 is connected to the first AC end, a second end of the first relay S1 is connected to the anode of the first diode D1, a cathode of the first diode D1 is connected to a first end of the AC-DC conversion module 20, a first end of the second relay S2 is connected to a first end of the first relay S1 or a second end of the first relay S1, a second end of the second relay S2 is connected to the cathode of the first diode D1, a first end of the third relay S3 is connected to the second AC end, and a second end of the third relay S3 is connected to a second end of the AC-DC conversion module 20;

[0074] The control module 30 is used to control the states of the first relay S1 , the second relay S2 and the third relay S3 , so that the current of the power supply device switches from flowing through the first diode D1 to flowing through the second relay S2 .

[0075] In the embodiment of the present application, the AC-DC conversion module 20 can convert AC power into DC power, or convert DC power into AC power. The AC-DC conversion module 20 can be a unidirectional conversion module or a bidirectional conversion module. When the AC-DC conversion module 20 is a unidirectional conversion module, the AC-DC conversion module 20 can convert AC power into DC power, or convert DC power into AC power. When the AC-DC conversion module 20 is a bidirectional conversion module, it can convert AC power into DC power, or convert DC power into AC power.

[0076] The alternating current / direct current converter (AC / DC) module may include a power factor correction (PFC) circuit and a direct current / direct current converter (DC / DC) module. The PFC circuit can convert AC to DC and improve the power factor of the power module, thereby optimizing power utilization efficiency.

[0077] The control module 30 may be a digital signal processor (DSP) or a microcontroller unit (MCU).

[0078] The power supply device may be an on-board charger (OBC), and the OBC may be a unidirectional OBC or a bidirectional OBC. A unidirectional OBC can only charge a battery (e.g., a power battery), and a bidirectional OBC can not only charge a battery, but also invert the battery's DC power into AC power (e.g., 220V AC power).

[0079] In the embodiment of the present application, when the current of the power supply device switches from flowing through the first diode D1 to flowing through the second relay S2, the voltage across the second relay S2 is clamped by the first diode D1. When the current of the power supply device passes through the second relay S2, no current shock will be generated, and the second relay S2 will not stick, thereby improving the safety of the power supply device.

[0080] See also Figure 2 , Figure 2 It is a structural schematic diagram of another power supply device provided in an embodiment of the present application. Figure 2 is Figure 1 Based on Figure 2 As shown, in Figure 1 On the basis of Figure 2The power supply device further includes a second switch module 40, a first end of the second switch module 40 is connected to the third AC end, a second end of the second switch module 40 is connected to the fourth AC end, a third end of the second switch module 40 is connected to the first end of the AC-DC conversion module 20, and a fourth end of the second switch module 40 is connected to the second end of the AC-DC conversion module 20;

[0081] The second switch module 40 includes a second diode D2, a fourth relay S4, a fifth relay S5 and a sixth relay S6, wherein a first end of the fourth relay S4 is connected to the first AC end, a second end of the fourth relay S4 is connected to the anode of the second diode D2, a cathode of the second diode D2 is connected to the first end of the AC-DC conversion module 20, a first end of the fifth relay S5 is connected to the first end of the fourth relay S4, a second end of the fifth relay S5 is connected to the cathode of the second diode D2, a first end of the sixth relay S6 is connected to the second AC end, and a second end of the sixth relay S6 is connected to the second end of the AC-DC conversion module 20;

[0082] The control module 30 is further used to control the states of the fourth relay S4 , the fifth relay S5 and the sixth relay S6 , so that the current of the power supply device switches from flowing through the second diode D2 to flowing through the fifth relay S5 .

[0083] In the embodiment of the present application, when the current of the power supply device switches from flowing through the second diode D2 to flowing through the fifth relay S5, the voltage across the fifth relay S5 is clamped by the second diode D2. When the current of the power supply device passes through the fifth relay S5, no current shock will be generated, and the fifth relay S5 will not stick, thereby improving the safety of the power supply device.

[0084] See also Figure 3 , Figure 3 is a schematic diagram of the structure of another power supply device provided in an embodiment of the present application. Figure 3 As shown, the power supply device includes a first switch module 10, an AC-DC conversion module 20 and a control module 30; a first end of the first switch module 10 is connected to a first AC end, a second end of the first switch module 10 is connected to a second AC end, a third end of the first switch module 10 is connected to a first end of the AC-DC conversion module 20, and a fourth end of the first switch module 10 is connected to a second end of the AC-DC conversion module 20;

[0085] The first switch module 10 includes a first diode D1, a first relay S1, a second relay S2 and a third relay S3, wherein a first end of the first relay S1 is connected to the first AC end, a second end of the first relay S1 is connected to the anode of the first diode D1, a cathode of the first diode D1 is connected to a first end of the AC-DC conversion module 20, a first end of the second relay S2 is connected to a second end of the first relay S1, a second end of the second relay S2 is connected to the cathode of the first diode D1, a first end of the third relay S3 is connected to the second AC end, and a second end of the third relay S3 is connected to a second end of the AC-DC conversion module 20;

[0086] The control module 30 is used to control the states of the first relay S1 , the second relay S2 and the third relay S3 , so that the current of the power supply device switches from flowing through the first diode D1 to flowing through the second relay S2 .

[0087] In the embodiment of the present application, when the current of the power supply device switches from flowing through the first diode D1 to flowing through the second relay S2, the voltage across the second relay S2 is clamped by the first diode D1. When the current of the power supply device passes through the second relay S2, no current shock will be generated, and the second relay S2 will not stick, thereby improving the safety of the power supply device.

[0088] See also Figure 4 , Figure 4 It is a structural schematic diagram of another power supply device provided in an embodiment of the present application. Figure 4 is Figure 3 Based on Figure 4 As shown, in Figure 3 On the basis of Figure 4 The power supply device further includes a second switch module 40, a first end of the second switch module 40 is connected to the third AC end, a second end of the second switch module 40 is connected to the fourth AC end, a third end of the second switch module 40 is connected to the first end of the AC-DC conversion module 20, and a fourth end of the second switch module 40 is connected to the second end of the AC-DC conversion module 20;

[0089] The second switch module 40 includes a second diode D2, a fourth relay S4, a fifth relay S5 and a sixth relay S6, wherein a first end of the fourth relay S4 is connected to the first AC end, a second end of the fourth relay S4 is connected to the anode of the second diode D2, a cathode of the second diode D2 is connected to the first end of the AC-DC conversion module 20, a first end of the fifth relay S5 is connected to the second end of the fourth relay S4, a second end of the fifth relay S5 is connected to the cathode of the second diode D2, a first end of the sixth relay S6 is connected to the second AC end, and a second end of the sixth relay S6 is connected to the second end of the AC-DC conversion module 20;

[0090] The control module 30 is further used to control the states of the fourth relay S4 , the fifth relay S5 and the sixth relay S6 , so that the current of the power supply device switches from flowing through the second diode D2 to flowing through the fifth relay S5 .

[0091] In the embodiment of the present application, when the current of the power supply device switches from flowing through the second diode D2 to flowing through the fifth relay S5, the voltage across the fifth relay S5 is clamped by the second diode D2. When the current of the power supply device passes through the fifth relay S5, no current shock will be generated, and the fifth relay S5 will not stick, thereby improving the safety of the power supply device.

[0092] Optional, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the third end of the AC-DC conversion module 20 is connected to the positive electrode of the battery, and the fourth end of the AC-DC conversion module 20 is connected to the negative electrode of the battery.

[0093] The first end of the AC-DC conversion module 20 and the second end of the AC-DC conversion module 20 are AC ports of the AC-DC conversion module 20 , and the third end of the AC-DC conversion module 20 and the fourth end of the AC-DC conversion module 20 are DC ports.

[0094] The first AC terminal may be a live wire of an AC power grid (eg Figures 1 to 4 L1 as shown), the second AC terminal may be the neutral line of the AC grid (such as Figures 1 to 4 The first AC terminal may be a live wire terminal for discharge outside the vehicle, and the second AC terminal may be a neutral wire terminal for discharge outside the vehicle. The third AC terminal may be a live wire terminal for discharge inside the vehicle (such as Figure 2 and Figure 4 L2 as shown), the fourth AC terminal can be a neutral line port for discharge in the vehicle (such as Figure 2 and Figure 4 N2 shown).

[0095] The current of the power supply device can be a charging current or a discharging current.

[0096] The power supply device can be in a charging state or a first discharging state. When the power supply device is in a charging state, the AC-DC conversion module 20 can convert the AC power between the first AC terminal and the second AC terminal into DC power to charge the battery, and the current of the power supply device is a charging current. When the power supply device is in a first discharging state, the AC-DC conversion module 20 can convert the DC power between the positive and negative poles of the battery into AC power and output it to the first AC terminal and the second AC terminal, and the current of the power supply device is a discharging current.

[0097] The power supply device can be in the second discharge state or the third discharge state. When the power supply device is in the second discharge state, the power supply device transmits the AC power of the first AC terminal and the second AC terminal to the third AC terminal and the fourth AC terminal by controlling the states of the first relay S1, the second relay S2, the third relay S3, the fourth relay S4, the fifth relay S5 and the sixth relay S6. At this time, the current of the power supply device is the discharge current.

[0098] When the power supply device is in the third discharging state, the AC-DC conversion module 20 can convert the DC power between the positive and negative electrodes of the battery into AC power and output it to the third AC terminal and the fourth AC terminal. At this time, the current of the power supply device is a discharging current.

[0099] The first discharge state is when the AC / DC conversion module 20 converts the DC power of the battery into AC power and discharges it to the first AC terminal and the second AC terminal, which can also be called the off-vehicle discharge state. The second discharge state is when the AC power of the first AC terminal and the second AC terminal is transmitted to the third AC terminal and the fourth AC terminal for discharge, which can also be called the first on-vehicle discharge state (the discharge process does not pass through the AC / DC conversion module 20). The third discharge state is when the AC / DC conversion module 20 converts the DC power of the battery into AC power and discharges it to the third AC terminal and the fourth AC terminal, which can also be called the second on-vehicle discharge state (the discharge process passes through the AC / DC conversion module 20).

[0100] Optional, such as Figures 1 to 4 As shown, K1 is the driving signal of the first relay S1, K2 is the driving signal of the second relay S2, and K3 is the driving signal of the third relay S3. The control module 30 can send K1, K2, and K3 to control the states of the first relay S1, the second relay S2, and the third relay S3 respectively.

[0101] Optional, such as Figure 2 and Figure 4As shown, K4 is the driving signal of the fourth relay S4, K5 is the driving signal of the fifth relay S5, and K6 is the driving signal of the sixth relay S6. The control module 30 can send K4, K5, and K6 to control the states of the fourth relay S4, the fifth relay S5, and the sixth relay S6, respectively.

[0102] Optional, such as Figures 1 to 4 As shown, a first voltage sampling circuit is added between the first end of the AC-DC conversion module 20 and the second end of the AC-DC conversion module 20, and the first voltage sampling circuit is used to sample the voltage V1 between the first end of the AC-DC conversion module 20 and the second end of the AC-DC conversion module 20. A second voltage sampling circuit is added between the first AC end and the second AC end, and is used to sample the voltage V2 between the first AC end and the second AC end. A first current sampling circuit is added between the cathode of the first diode D1 and the first end of the AC-DC conversion module 20, and the first current sampling circuit is used to sample the current Am1 of the first end of the AC-DC conversion module 20.

[0103] Optional, such as Figure 2 and Figure 4 As shown, a second current sampling circuit is added between the cathode of the first diode D1 and the cathode of the second diode D2, and the second current sampling circuit is used to sample the current Am2 between the cathode of the first diode D1 and the cathode of the second diode D2.

[0104] The control module 30 can identify the positive half-wave zero-crossing point or the negative half-wave zero-crossing point of the alternating current V1 through the first voltage sampling circuit, and identify the positive half-wave zero-crossing point or the negative half-wave zero-crossing point of the alternating current V2 through the second voltage sampling circuit. The control module 30 can sample Am1 through the first current sampling circuit and sample Am2 through the second current sampling circuit, and can identify the effective value and peak value of the alternating current.

[0105] Optional, such as Figure 1 and Figure 2 As shown, when any one of the first relay S1 and the second relay S2 is closed, the third relay S3 is closed.

[0106] Optional, such as Figure 1 and Figure 2 As shown, when any one of the fourth relay S4 and the fifth relay S5 is closed, the sixth relay S6 is closed.

[0107] Optional, such as Figure 1 and Figure 2 As shown, when the first relay S1 is controlled to complete the pull-in, the first diode D1 will be in a cut-off state.

[0108] Optional, such as Figure 1 and Figure 2As shown, when the fourth relay S4 is controlled to complete the pull-in, the second diode D2 will be in a cut-off state.

[0109] Optional, such as Figure 1 and Figure 2 As shown, when the second relay S2 is controlled to complete the pull-in, the first diode D1 will be in a conducting state.

[0110] Optional, such as Figure 1 and Figure 2 As shown, when the fifth relay S5 is controlled to complete the pull-in, the second diode D2 will be in a conducting state.

[0111] like Figure 1 and Figure 2 As shown, when the first relay S1 and the third relay S3 are energized, no current flows through the first relay S1 and the third relay S3, and when the first diode D1 is turned on, the voltage of V2 is at the zero point, there is no impact current, and the first relay S1 and the third relay S3 will not have a sticking fault; when the second relay S2 is energized, the voltage between the contacts of the second relay S2 (i.e., the voltage between the two ends of the second relay S2) is clamped by the first diode D1, there is no voltage difference between the contacts, no arcing will occur, and the current transitions from flowing through the first diode D1 to flowing through the second relay S2, there is no current impact phenomenon, and the second relay S2 will not have a sticking fault.

[0112] like Figure 2 As shown, when the fourth relay S4 and the sixth relay S6 are energized, no current flows through the fourth relay S4 and the sixth relay S6, and when the second diode D2 is turned on, the voltage V1 is at the zero point, there is no impact current, and the fourth relay S4 and the sixth relay S6 will not have a sticking failure; when the fifth relay S5 is energized, the contact voltage of the fifth relay S5 (i.e., the voltage between the two ends of the fifth relay S5) is clamped by the second diode D2, there is no voltage difference between the contacts, no arcing will occur, and the current transitions from flowing through the second diode D2 to flowing through the fifth relay S5, there is no current impact phenomenon, and the fifth relay S5 will not have a sticking failure.

[0113] When controlling the relays in the first switch module 10 to be disconnected, the second relay S2 is first controlled to be disconnected, and then the first relay S1 and the third relay S3 are controlled to be disconnected. When controlling the relays in the second switch module 40 to be disconnected, the fifth relay S5 is first controlled to be disconnected, and then the fourth relay S4 and the sixth relay S6 are controlled to be disconnected.

[0114] Optional, such as Figure 1 and Figure 2 As shown, when the second relay S2 is controlled to be disconnected, the first relay S1 and the third relay S3 are in the attracted state, and the first diode D1 is in the conductive state.

[0115] Optional, such as Figure 2 As shown, when the fifth relay S5 is controlled to be disconnected, the fourth relay S4 and the sixth relay S6 are in the attracted state, and the second diode D2 is in the conductive state.

[0116] Optional, such as Figure 1 and Figure 2 As shown, after the second relay S2 is disconnected, when the first diode D1 is turned off, the first relay S1 and the third relay S3 are disconnected.

[0117] Optional, such as Figure 2 As shown, after the fifth relay S5 is disconnected, when the second diode D2 is turned off, the fourth relay S4 and the sixth relay S6 are disconnected.

[0118] When the second relay S2 is disconnected, the voltage across the second relay S2 is clamped by the first diode D1, and the second relay S2 will not stick. When the first relay S1 is disconnected, the first diode D1 is cut off, the first relay S1 has no current, and the first relay S1 will not stick.

[0119] When the fifth relay S5 is disconnected, the voltage across the fifth relay S5 is clamped by the second diode D2, and the fifth relay S5 will not be stuck. When the fourth relay S4 is disconnected, the second diode D2 is turned off, the fourth relay S4 has no current, and the fourth relay S4 will not be stuck.

[0120] See also Figure 5 , Figure 5 1 is a schematic diagram of the relay conduction timing of a power supply device entering a charging state provided by an embodiment of the present application. Figure 5 As shown, V2 is the voltage of the alternating current between the first AC end and the second AC end sampled by the second voltage sampling circuit. The frequency of the waveform of V2 can be the power frequency, and the power frequency can be 50 Hz. K1, K2, and K3 are the driving signals of the first relay S1, the second relay S2, and the third relay S3, respectively. Since there is a pull-in time for the relay, when the driving signal of the relay is switched from a low level to a high level, it will not be pulled in immediately, so when the driving signal of the relay is switched to a high level, the relay will not be pulled in immediately, but will be pulled in after a period of time (pull-in time). Exemplarily, the pull-in time of the first relay S1, the second relay S2, and the third relay S3 in the embodiment of the present application is 5-8 milliseconds (ms).

[0121] The control module 30 can detect the positive half-wave zero-crossing point or the negative half-wave zero-crossing point of the AC power V2 through the second voltage sampling circuit. The positive half-wave zero-crossing point of V2 is the moment when V2 passes through zero from the negative half-cycle to the positive half-cycle (e.g. Figure 5The negative half-wave zero-crossing point of V2 is the moment when V2 passes through zero from the positive half-cycle to the negative half-cycle (as shown in the T3 moment). Figure 5 T0 and T6 moments shown).

[0122] like Figure 5 As shown, at time T0, the control module 30 detects the negative half-wave zero-crossing point of the AC voltage V2;

[0123] At time T1, the control module 30 sends drive signals K1 and K3 to the first relay S1 and the third relay S3; wherein 0≤T1-T0≤2ms;

[0124] At time T2, the first relay S1 and the third relay S3 are closed, and the first diode D1 is in the cut-off state;

[0125] At time T3, the AC voltage V2 begins to enter the positive half cycle of the sine wave, and the first diode D1 is turned on;

[0126] At time T4, the control module 30 sends a drive signal K2 to the second relay S2; wherein 0≤T4-T3≤2ms;

[0127] At time T5, the second relay S2 is closed and the charging current is switched to the second relay S2.

[0128] See also Figure 6 , Figure 6 It is a schematic diagram of a relay conduction timing simulation result of a power supply device entering a charging state provided in an embodiment of the present application. Figure 6 In the simulation, the Am1 current is switched from flowing through the first relay S1 to flowing through the second relay S2.

[0129] like Figure 6 As shown, the simulation results are: when the first relay S1 and the third relay S3 are energized, the first diode D1 is in the off state, and the first relay S1 has no current. When the first diode D1 is turned on, since the voltage of V2 is near zero, there is no impact current, and the first relay S1 and the third relay S3 will not stick.

[0130] When the second relay S2 is energized, the voltage between the contacts is clamped by the first diode D1, and no arcing occurs. After the second relay S2 is energized, the current of the second relay S2 is transferred from the first diode D1, and there is no impact current; the second relay S2 will not stick.

[0131] in, Figure 5 and Figure 6 Can be used for Figure 1 or Figure 2 The power supply unit shown.

[0132] See also Figure 7 , Figure 7 It is a relay conduction timing diagram of a power supply device provided in an embodiment of the present application when it is in a charging state and enters a second discharge state. The second discharge state can also be called the first in-vehicle discharge state (the discharge process does not pass through the AC-DC conversion module 20).

[0133] like Figure 7 As shown, V2 is the voltage of the alternating current between the first AC end and the second AC end sampled by the second voltage sampling circuit. The frequency of the waveform of V2 can be power frequency, and the power frequency can be 50 Hz (Hz). K2 is the driving signal of the second relay S2, and K4, K5, and K6 are the driving signals of the fourth relay S4, the fifth relay S5, and the sixth relay S6, respectively. Due to the existence of the pull-in time of the relay, when the driving signal of the relay is switched from a low level to a high level, it will not be pulled in immediately, so when the driving signal of the relay is switched to a high level, the relay will not be pulled in immediately, but will be pulled in after a period of time (pull-in time). Exemplarily, the pull-in time of the second relay S2, the fourth relay S4, the fifth relay S5, and the sixth relay S6 in the embodiment of the present application is 5-8 milliseconds (ms).

[0134] The control module 30 can detect the positive half-wave zero-crossing point or the negative half-wave zero-crossing point of the AC power V2 through the second voltage sampling circuit. The positive half-wave zero-crossing point of V2 is the moment when V2 passes through zero from the negative half-cycle to the positive half-cycle (e.g. Figure 7 The negative half-wave zero-crossing point of V2 is the moment when V2 passes through zero from the positive half-cycle to the negative half-cycle (as shown in the figure). Figure 7 time T3 as shown).

[0135] like Figure 7 As shown, at time T0, the second relay S2 has been closed, and the control module 30 detects the zero crossing of the positive half-wave of the AC voltage V2; it should be noted that Figure 7 When the power supply device is already in the charging state (the second relay S2 has been completely attracted at this time), it enters the second discharging state, and the power supply device is in the charging state and the second discharging state at the same time.

[0136] At time T1, the control module 30 sends drive signals K4 and K6 to the fourth relay S4 and the sixth relay S6; wherein 0≤T1-T0≤2ms;

[0137] At time T2, the fourth relay S4 and the sixth relay S6 are closed, and the second diode D2 is in the cut-off state;

[0138] At time T3, the voltage V2 begins to enter the negative half cycle of the sine wave, and the second diode D2 begins to conduct;

[0139] At time T4, the control module 30 sends a drive signal K5 to the fifth relay S5; wherein 0≤T4-T3≤2ms;

[0140] At time T5, the fifth relay S5 is completely closed, and the discharge current switches from flowing through the second diode D2 to flowing through the fifth relay S5.

[0141] See also Figure 8 , Figure 8 It is a schematic diagram of a relay conduction timing simulation result of a power supply device provided in an embodiment of the present application entering a second discharge state when in a charging state. Figure 8 In the simulation, the Am2 current is switched from flowing through the fourth relay S4 to flowing through the fifth relay S5.

[0142] like Figure 8 As shown, the simulation results are as follows: when the fourth relay S4 and the sixth relay S6 are energized, the second diode D2 is cut off and there is no current. When the second diode D2 is turned on, since the voltage V2 is near zero, there is no impact current, and the fourth relay S4 and the sixth relay S6 will not be stuck.

[0143] When the fifth relay S5 is energized, the voltage between the contacts is clamped by the second diode D2, and no arcing occurs. After the fifth relay S5 is energized, the current of the fifth relay S5 is transferred from the second diode D2, and there is no impact current; the fifth relay S5 will not stick.

[0144] in, Figure 7 and Figure 8 Can be used for Figure 2 The power supply unit shown.

[0145] See also Fig. 9 , Fig. 9 1 is a schematic diagram of the relay conduction timing of a power supply device entering a first discharge state provided by an embodiment of the present application. Fig. 9 As shown, V1 is the voltage of the alternating current between the first end of the AC-DC conversion module 20 and the second end of the AC-DC conversion module 20 sampled by the first voltage sampling circuit. The frequency of the waveform of V1 can be the power frequency, and the power frequency can be 50 Hz. K1, K2, and K3 are the driving signals of the first relay S1, the second relay S2, and the third relay S3, respectively. Since there is a pull-in time for the relay, when the driving signal of the relay is switched from a low level to a high level, it will not be pulled in immediately, so when the driving signal of the relay is switched to a high level, the relay will not be pulled in immediately, but will be pulled in after a period of time (pulling time). Exemplarily, the pull-in time of the first relay S1, the second relay S2, and the third relay S3 in the embodiment of the present application is 5-8 milliseconds (ms).

[0146] The control module 30 can detect the zero-crossing point of the positive half-wave or the negative half-wave of the alternating current V1 through the first voltage sampling circuit. The zero-crossing point of the positive half-wave of V1 is the moment when V1 passes through zero from the negative half-cycle to the positive half-cycle (e.g. Fig. 9 The negative half-wave zero-crossing point of V1 is the moment when V1 passes through zero from the positive half-cycle to the negative half-cycle (as shown in the figure). Fig. 9 time T3 as shown).

[0147] like Fig. 9 As shown, at time T0, the control module 30 detects the zero crossing point of the positive half-wave of the AC voltage V1;

[0148] At time T1, the control module 30 sends drive signals K1 and K3 to the first relay S1 and the third relay S3; wherein 0≤T1-T0≤2ms;

[0149] At time T2, the first relay S1 and the third relay S3 are closed, and the first diode D1 is in the cut-off state;

[0150] At time T3, the AC voltage V1 begins to enter the negative half cycle of the sine wave, and the first diode D1 is turned on;

[0151] At time T4, the control module 30 sends a drive signal K2 to the second relay S2; wherein 0≤T4-T3≤2ms;

[0152] At time T5, the second relay S2 is closed and the discharge current is switched to the second relay S2.

[0153] See also Fig.10 , Fig.10 It is a schematic diagram of a relay conduction timing simulation result of a power supply device entering a first discharge state provided in an embodiment of the present application. Fig.10 In the simulation, the Am1 current is switched from flowing through the first relay S1 to flowing through the second relay S2.

[0154] like Fig.10 As shown, the simulation results are as follows: when the first relay S1 and the third relay S3 are energized, the first diode D1 is in the off state, and the first relay S1 has no current. When the first diode D1 is turned on, since the voltage of V1 is near zero, there is no impact current, and the first relay S1 and the third relay S3 will not stick together.

[0155] When the second relay S2 is energized, the voltage between the contacts is clamped by the first diode D1, and no arcing occurs. After the second relay S2 is energized, the current of the second relay S2 is transferred from the first diode D1, and there is no impact current; the second relay S2 will not stick.

[0156] in, Fig. 9 and Fig.10 Can be used for Figure 1 or Figure 2 The power supply unit shown.

[0157] See also Fig.11 , Fig.11 1 is a schematic diagram of the relay conduction timing of a power supply device entering the third discharge state provided by an embodiment of the present application. Fig.11 As shown, V1 is the voltage of the alternating current between the first end of the AC-DC conversion module 20 and the second end of the AC-DC conversion module 20 sampled by the first voltage sampling circuit. The frequency of the waveform of V1 can be the power frequency, and the power frequency can be 50 Hz. K4, K5, and K6 are the drive signals of the fourth relay S4, the fifth relay S5, and the sixth relay S6, respectively. Since the relay has a pull-in time, when the drive signal of the relay is switched from a low level to a high level, it will not be pulled in immediately, so when the drive signal of the relay is switched to a high level, the relay will not be pulled in immediately, but will be pulled in after a period of time (pull-in time). Exemplarily, the pull-in time of the fourth relay S4, the fifth relay S5, and the sixth relay S6 in the embodiment of the present application is 5-8 milliseconds (ms).

[0158] The control module 30 can detect the zero-crossing point of the positive half-wave or the negative half-wave of the alternating current V1 through the first voltage sampling circuit. The zero-crossing point of the positive half-wave of V1 is the moment when V1 passes through zero from the negative half-cycle to the positive half-cycle (e.g. Fig.11 The negative half-wave zero-crossing point of V1 is the moment when V1 passes through zero from the positive half-cycle to the negative half-cycle (as shown in the figure). Fig.11 time T3 as shown).

[0159] like Fig.11 As shown, at time T0, the control module 30 detects the zero crossing point of the positive half-wave of the AC voltage V1;

[0160] At time T1, the control module 30 sends drive signals K4 and K6 to the fourth relay S4 and the sixth relay S6; wherein 0≤T1-T0≤2ms;

[0161] At time T2, the fourth relay S4 and the sixth relay S6 are closed, and the second diode D2 is in the cut-off state;

[0162] At time T3, the AC voltage V1 begins to enter the negative half cycle of the sine wave, and the second diode D2 is turned on;

[0163] At time T4, the control module 30 sends a drive signal K5 to the fifth relay S5; wherein 0≤T4-T3≤2ms;

[0164] At time T5, the fifth relay S5 is closed, and the discharge current is switched to the fifth relay S5.

[0165] See also Fig.12 , Fig.12 It is a schematic diagram of a relay conduction timing simulation result of a power supply device entering a third discharge state provided in an embodiment of the present application. Fig.12 In the simulation, the Am2 current is switched from flowing through the fourth relay S4 to flowing through the fifth relay S5.

[0166] like Fig.12 As shown, the simulation results are: when the fourth relay S4 and the sixth relay S6 are energized, the second diode D2 is in the cut-off state, and the fourth relay S4 has no current. When the second diode D2 is turned on, since the voltage of V1 is near zero, there is no impact current, and the fourth relay S4 and the sixth relay S6 will not stick;

[0167] When the fifth relay S5 is energized, the voltage between the contacts is clamped by the second diode D2, and no arcing occurs. After the fifth relay S5 is energized, the current of the fifth relay S5 is transferred from the second diode D2, and there is no impact current; the fifth relay S5 will not stick.

[0168] in, Fig.11 and Fig.12 Can be used for Figure 1 or Figure 2 The power supply unit shown.

[0169] Among them, the above Figures 5 to 12 The horizontal axis is time.

[0170] See also Fig.13 , Fig.13 Schematic diagram of a vehicle structure provided by an embodiment of the present application. Fig.13 As shown, the vehicle may include a power supply device 100 and a battery 200. The battery 200 may be a power battery on the vehicle. The vehicle may be an electric vehicle or a hybrid vehicle.

[0171] Fig.13 The specific structure and working principle of the power supply device 100 can be found in the above embodiment and will not be described again here.

[0172] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0173] In the several embodiments provided in the present application, it should be understood that the disclosed power supply device and vehicle can be implemented in other ways. For example, the power supply device embodiments described above are only schematic, and the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

Claims

1. A power supply device, characterized in that: It includes a first switch module, an AC-DC conversion module and a control module; a first end of the first switch module is connected to a first AC end, a second end of the first switch module is connected to a second AC end, a third end of the first switch module is connected to a first end of the AC-DC conversion module, and a fourth end of the first switch module is connected to a second end of the AC-DC conversion module; The first switch module includes a first diode, a first relay, a second relay and a third relay, wherein a first end of the first relay is connected to the first AC end, a second end of the first relay is connected to the anode of the first diode, a cathode of the first diode is connected to the first end of the AC-DC conversion module, a first end of the second relay is connected to the first end of the first relay or the second end of the first relay, a second end of the second relay is connected to the cathode of the first diode, a first end of the third relay is connected to the second AC end, and a second end of the third relay is connected to the second end of the AC-DC conversion module; The control module is used to control the states of the first relay, the second relay and the third relay so that the current of the power supply device switches from flowing through the first diode to flowing through the second relay.

2. The power supply device according to claim 1, characterized in that: The control module is used to control the states of the first relay, the second relay and the third relay so that the current of the power supply device switches from flowing through the first diode to flowing through the second relay, including: The control module is used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to AC power, so that the power supply device is in a charging state, and the charging current of the power supply device is switched from flowing through the first diode to flowing through the second relay.

3. The power supply device according to claim 2, characterized in that: The control module is used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to AC power, so that the power supply device is in a charging state, and the charging current of the power supply device is switched from flowing through the first diode to flowing through the second relay, including: The control module is used to control the first relay and the third relay to be attracted, and control the second relay to be disconnected when the first AC end and the second AC end are connected to AC power and it is detected that the voltage between the first AC end and the second AC end is in a negative half cycle, and to control the second relay to be attracted when it is detected that the voltage between the first AC end and the second AC end switches from the negative half cycle to the positive half cycle, so that the power supply device is in a charging state, and the charging current of the power supply device switches from flowing through the first diode to flowing through the second relay; wherein, when the voltage between the first AC end and the second AC end is in a negative half cycle, the first diode is in a cut-off state, and when the voltage between the first AC end and the second AC end is in a positive half cycle, the first diode is in a conducting state.

4. The power supply device according to claim 1, characterized in that: The control module is used to control the states of the first relay, the second relay and the third relay so that the current of the power supply device switches from flowing through the first diode to flowing through the second relay, including: The control module is used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to a first AC load, so that the power supply device is in a first discharge state, and the discharge current of the power supply device is switched from flowing through the first diode to flowing through the second relay.

5. The power supply device according to claim 4, characterized in that: The control module is further used to control the conduction timing of the first relay, the second relay and the third relay when the first AC end and the second AC end are connected to a first AC load, so that the power supply device is in a first discharge state, and the discharge current of the power supply device switches from flowing through the first diode to flowing through the second relay, including: The control module is further used for controlling the first relay and the third relay to be attracted, and controlling the second relay to be disconnected when the first AC end and the second AC end are connected to a first AC load and detecting that the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a positive half cycle, and controlling the second relay to be attracted when detecting that the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module switches from the positive half cycle to the negative half cycle, so that the power supply device is in a first discharge state, and the discharge current of the power supply device switches from flowing through the first diode to flowing through the second relay; wherein, when the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a positive half cycle, the first diode is in a cut-off state, and when the voltage between the first end of the AC-DC conversion module and the second end of the AC-DC conversion module is in a negative half cycle, the first diode is in a conducting state.

6. The power supply device according to any one of claims 1 to 5, characterized in that: The power supply device further comprises a second switch module, wherein a first end of the second switch module is connected to a third AC end, a second end of the second switch module is connected to a fourth AC end, a third end of the second switch module is connected to a first end of the AC-DC conversion module, and a fourth end of the second switch module is connected to a second end of the AC-DC conversion module; The second switch module includes a second diode, a fourth relay, a fifth relay and a sixth relay, wherein a first end of the fourth relay is connected to the first AC end, a second end of the fourth relay is connected to the anode of the second diode, a cathode of the second diode is connected to the first end of the AC-DC conversion module, a first end of the fifth relay is connected to the first end of the fourth relay or the second end of the fourth relay, a second end of the fifth relay is connected to the cathode of the second diode, a first end of the sixth relay is connected to the second AC end, and a second end of the sixth relay is connected to the second end of the AC-DC conversion module; The control module is further used to control the states of the fourth relay, the fifth relay and the sixth relay so that the current of the power supply device switches from flowing through the second diode to flowing through the fifth relay.

7. The power supply device according to claim 6, characterized in that: The control module is further used to control the states of the fourth relay, the fifth relay and the sixth relay so that the current of the power supply device switches from flowing through the second diode to flowing through the fifth relay, including: The control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the power supply device is in a charging state and the third AC terminal and the fourth AC terminal are connected to a second AC load, so that the power supply device is in a charging state and a second discharging state, and the discharge current of the power supply device is switched from flowing through the second diode to flowing through the fifth relay.

8. The power supply device according to claim 7, characterized in that: The control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the power supply device is in a charging state and the third AC end and the fourth AC end are connected to a second AC load, so that the power supply device is in a charging state and a second discharging state, and the discharge current of the power supply device switches from flowing through the second diode to flowing through the fifth relay, including: The control module is also used to control the fourth relay and the sixth relay to be attracted, and the fifth relay to be disconnected when the power supply device is in the charging state, the third AC terminal and the fourth AC terminal are connected to the second AC load, and it is detected that the voltage between the first AC terminal and the second AC terminal is in the positive half cycle, and to control the fifth relay to be attracted when it is detected that the voltage between the first AC terminal and the second AC terminal switches from the positive half cycle to the negative half cycle, so that the power supply device is in the charging state and the second discharging state, and the discharge current of the power supply device switches from flowing through the second diode to flowing through the fifth relay; wherein, when the voltage between the first AC terminal and the second AC terminal is in the positive half cycle, the second diode is in the cut-off state, and when the voltage between the first AC terminal and the second AC terminal is in the negative half cycle, the second diode is in the on state.

9. The power supply device according to claim 6, characterized in that: The control module is further used to control the states of the fourth relay, the fifth relay and the sixth relay so that the current of the power supply device switches from flowing through the second diode to flowing through the fifth relay, including: The control module is further used to control the conduction timing of the fourth relay, the fifth relay and the sixth relay when the third AC end and the fourth AC end are connected to the second AC load, so that the power supply device is in a third discharge state, and the discharge current of the power supply device is switched from flowing through the second diode to flowing through the fifth relay.

10. A vehicle, characterized in that: The invention comprises a power supply device as claimed in any one of claims 1 to 9 and a battery.

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