Interface power-off control device and inverter equipment

Abstract

The present application provides an interface power-off control device and an inverter device. The interface power-off control device is applied to an inverter. The inverter includes an inverter circuit, a load switch and a load interface. The inverter circuit is connected to the load interface through the load switch. The load interface is provided with a protective cover after being connected to the electrical load. The interface power-off control device includes a detection module and a switch control module. The detection module is provided at the load interface. The detection module is used to output a detection signal when the load interface is provided with a protective cover. The detection signal is used to characterize that the load interface is provided with a protective cover. The switch control module connects the detection module and the load switch. The switch control module is used to control the load switch to turn on when receiving the detection signal so that electric energy can be transmitted between the load interface and the electrical load, and to control the load switch to turn off when the detection signal is not received so that the load interface is powered off. The interface power-off control device of the present application can control the on and off of the load interface of the inverter to reduce the risk of electric shock.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and in particular to an interface power-off control device and an inverter device. Background Art

[0002] The inverter has an EPS (emergency power supply) interface and an AC (alternating current) interface. The EPS interface is used to connect the load, and the AC interface is used to connect to the grid. At present, when the AC interface is not connected to the grid, the relay on the AC interface side will automatically disconnect to ensure that the AC interface is not energized. In order to facilitate users to load at any time, the EPS interface will always be energized. To prevent users from getting electric shock, the EPS interface often adopts a tool unlocking design. When the EPS interface is not needed, the EPS interface will be covered with a protective cover to prevent users from accidentally touching the interface terminals. When the EPS interface needs to be used, it is necessary to remove the protective cover first, and then reinstall the protective cover after the EPS interface is connected. Since the EPS interface remains energized when the protective cover is not installed, the risk of electric shock to the user still exists. Utility Model Content

[0003] In view of this, the present application provides an interface power-off control device and an inverter device, which can realize the power-on and power-off control of the load interface of the inverter, thereby reducing the risk of electric shock to users.

[0004] The first aspect of the present application provides an interface power-off control device, which is applied to an inverter. The inverter includes an inverter circuit, a load switch and a load interface, the inverter circuit is connected to the load interface through the load switch, and the load interface is used to set a protective cover after connecting to the power load; the interface power-off control device includes: a detection module and a switch control module, wherein the detection module is arranged at the load interface, and the detection module is used to output a detection signal when the load interface is set with a protective cover; the detection signal is used to characterize that the load interface is set with a protective cover; the switch control module connects the detection module and the load switch, and the switch control module is used to control the load switch to conduct when receiving the detection signal, so that the load interface and the power load are transmitted; and is used to control the load switch to disconnect when the detection signal is not received, so that the load interface is powered off.

[0005] In one embodiment, the detection module includes P sensors, where P is a positive integer not less than 2, and each sensor is respectively disposed at a contact point between the load interface and the protective cover.

[0006] In one embodiment, the switch control module includes P sampling circuits, a control circuit and a drive circuit; the sampling circuits are connected to the sensors one by one, each sampling circuit is used to collect the detection signal of the connected sensor and output a corresponding sampling signal; the control circuit is connected to each sampling circuit and the drive circuit, the control circuit is used to output a control signal to the drive circuit when receiving Q sampling signals, Q is a positive integer not less than 2 and not greater than P; the drive circuit is connected to the load switch, the drive circuit is used to turn on the load switch when receiving the control signal, and turn off the load switch when not receiving the control signal.

[0007] In one embodiment, each sampling circuit includes a signal amplifying circuit, the input end of the signal amplifying circuit is connected to the sensor, the output end of the signal amplifying circuit is connected to the control circuit, and the signal amplifying circuit is used to amplify the detection signal when receiving the detection signal to obtain a sampling signal.

[0008] In one embodiment, the switch control module includes a control circuit and a drive circuit; the control circuit is connected to P sensors and the drive circuit, and the control circuit is used to output a control signal to the drive circuit when a Q-path detection signal is received, where Q is a positive integer not less than 2 and not greater than P; the drive circuit is connected to the load switch, and the drive circuit is used to turn on the load switch when the control signal is received, and to turn off the load switch when the control signal is not received.

[0009] In one embodiment, the driving circuit includes a voltage conversion circuit, a power tube and a protection circuit; the input end of the voltage conversion circuit is connected to the control circuit, the output end of the voltage conversion circuit is connected to the control end of the power tube, and the voltage conversion circuit is used to convert the control signal into a control voltage and output it to the control end of the power tube when receiving the control signal; the first connection end of the power tube is connected to the load switch, the second connection end of the power tube is grounded, the load switch is connected in parallel with the protection circuit and is also connected to a DC voltage, the power tube is used to be turned on when the control voltage is connected, so that the load switch is connected to the DC voltage and turned on, and is used to be disconnected when the control voltage is not connected, so that the load switch is not connected to the DC voltage and is disconnected.

[0010] In one embodiment, the sensor is a pressure sensor, and the detection signal is the pressure applied by the protective cover to the load interface.

[0011] The second aspect of the present application provides an inverter device, which includes: an inverter and an interface power-off control device, wherein the inverter includes an inverter circuit, a load switch and a load interface, the load switch is connected between the inverter circuit and the load interface, and the load interface is used to be covered with a protective cover after the electrical load is connected; the interface power-off control device is connected to the load switch, and the interface power-off control device is used to control the load switch to be turned on when the load interface is covered with a protective cover, so that electric energy is transmitted between the load interface and the electrical load; and is used to control the load switch to be disconnected when the load interface is not covered with a protective cover, so that the load interface is powered off.

[0012] In one embodiment, the protective cover is connected to the load interface by means of a lock.

[0013] In one embodiment, the interface power-off control device is at least partially integrated into the inverter.

[0014] Compared with the prior art, this application has the following advantages:

[0015] The interface power-off control device of the present application can be applied to the inverter and used in conjunction with the inverter. When the load interface is not covered with a protective cover, the interface power-off control device can cut off the power of the load interface and prohibit the load interface from being energized, thereby avoiding the user from accidentally touching the load interface and getting an electric shock when the load interface is not installed with a protective cover. When the load interface is covered with a protective cover, the interface power-off control device allows the load interface to be energized, so that the inverter can supply power to the electrical load through the load interface. Therefore, the interface power-off control device of the present application can realize the automatic on and off switching control of the load interface without increasing the user operation, thereby effectively reducing the risk of electric shock to the user and improving the safety performance of the inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of an application scenario of the interface power-off control device provided in an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of a load interface of an inverter provided in an embodiment of the present application without a protective cover.

[0019] Figure 3 yes Figure 2 Enlarged view of part a.

[0020] Figure 4 It is a schematic diagram of the load interface of the inverter provided in an embodiment of the present application after being connected with wires and covered with a protective cover.

[0021] Figure 5 yes Figure 1 A structural block diagram of an interface power-off control device is shown.

[0022] Figure 6 yes Figure 5 A circuit diagram of an interface power-off control device is shown.

[0023] Main component symbols

[0024] Inverter equipment 100

[0025] Inverter 10

[0026] Inverter circuit 11

[0027] Grid-connected switch 12

[0028] Load switch 13

[0029] Grid connection interface 14

[0030] Load interface 15

[0031] Protective cover 16

[0032] Interface power off control device 20

[0033] Detection module 21

[0034] Sensor 211

[0035] Switch control module 22

[0036] Sampling circuit 221

[0037] Control circuit 222

[0038] Driving circuit 223

[0039] Voltage conversion circuit 2231

[0040] Protection circuit 2232

[0041] Grid 200

[0042] Electrical load 300 DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should belong to the scope of protection of the present application. In the absence of conflict, the following different embodiments and features in the embodiments can be combined with each other. It should be noted that for ordinary technicians in the field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. The term "including" and any of their variations are intended to cover non-exclusive inclusions.

[0044] See also Figure 1 , is a schematic diagram of a scenario in which the interface power-off control device provided in an embodiment of the present application is applied to an inverter.

[0045] like Figure 1 As shown, the inverter 10 may include an inverter circuit 11, a grid-connected interface 14, a load interface 15, a DC interface (not shown) and a controller (not shown). The inverter circuit 11 is connected to the grid-connected interface 14, the load interface 15 and the DC interface. The grid-connected interface 14 can be connected to the phase line L and the neutral line N of the power grid 200, and the grid-connected interface 14 can also be called an AC interface. The load interface 15 can be connected to the phase line L' and the neutral line N' of the power load 300, and the load interface 15 can also be called an EPS interface. The DC interface can be used to connect to devices that can provide DC power, such as photovoltaic components or battery packs.

[0046] The inverter circuit 11 is also connected to the controller, and its working process is controlled by the controller. Specifically, the inverter circuit 11 can be used to access DC power through a DC interface, and invert the DC power into AC power and supply it to the power load 300 through the load interface 15. In some cases, the inverter circuit 11 can also be used to access AC power through the grid interface 14, and rectify the AC power into DC power and charge the battery pack through the DC interface. Among them, the types of the inverter circuit 11 and the controller can be determined according to actual conditions. For example, the inverter circuit 11 can be a full-bridge inverter circuit 11, and the controller can be an MCU (Microcontroller Unit).

[0047] in addition, Figure 1 The inverter 10 in the scenario further includes a grid-connected switch 12 and a load switch 13. The grid-connected switch 12 and the load switch 13 are both electrically controlled switches, and the specific types can be determined according to actual conditions, for example, they can be relays.

[0048] The grid-connected switch 12 is provided between the inverter circuit 11 and the grid-connected interface 14. The grid-connected switch 12 is connected to the controller of the inverter 10, and its on-off state is controlled by the controller. Specifically, when the power grid 200 is operating normally, the grid-connected switch 12 is turned on, so that the inverter 10 can be electrically connected to the power grid 200 through the grid-connected interface 14, so at this time the grid-connected interface 14 is energized, and the inverter 10 is grid-connected. When the power grid 200 loses power or fails, the grid-connected switch 12 is turned off, so that the connection between the grid-connected interface 14 and the power grid 200 is disconnected, so at this time the grid-connected interface 14 is powered off, and the inverter 10 is off-grid.

[0049] The load switch 13 is connected between the inverter circuit 11 and the load interface 15. The load switch 13 is connected to the interface power-off control device 20 provided in the embodiment of the present application, and its on-off state is controlled by the interface power-off control device 20. In a specific implementation, the interface power-off control device 20 can be at least partially integrated into the inverter 10. Of course, the interface power-off control device 20 can be integrated separately, which does not constitute a limitation to the present application.

[0050] In the embodiment of the present application, in order to prevent the user from electric shock, the load interface 15 adopts a tool unlocking design. That is, the inverter 10 also includes a protective cover 16, or in other words, the inverter 10 is also equipped with a protective cover 16. When the load interface 15 is not needed (i.e., the power load 300 does not need to be connected), the protective cover 16 is set outside the load interface 15 to prevent the user from accidentally touching the conductive terminal of the load interface 15. When the load interface 15 needs to be used (i.e., the power load 300 needs to be connected), the protective cover 16 is set outside the load interface 15 to prevent the user from accidentally touching the conductive terminal of the load interface 15. Figure 2 As shown, it is necessary to remove the protective cover 16 first. After the phase line L' and the neutral line N' of the electric load 300 pass through the protective cover 16 and are connected to the conductive terminals of the load interface 15, the protective cover 16 is reinstalled. Figure 4 , the connection between the load interface 15 and the electrical load 300 is completed. That is, the load interface 15 will remove the protective cover 16 before connecting to the electrical load 300 (ie, the protective cover 16 is not installed, see Figure 2 ), after connecting to the electrical load 300, a protective cover 16 is provided (see Figure 4 ). In this embodiment, Figure 4 As shown, the protective cover 16 can also be locked to the base of the load interface 15 by means of accessories such as screws or buckles, so that the protective cover 16 can be tightly fastened to the load interface 15.

[0051] Therefore, when the load interface 15 is covered with the protective cover 16, the interface power-off control device 20 controls the load switch 13 to be turned on, so that when the load interface 15 is connected to the power load 300 and the protective cover 16 is installed, the inverter 10 can be electrically connected to the power load 300 through the load interface 15 and supply power to the power load 300, so the load interface 15 is energized at this time. When the load interface 15 is not covered with the protective cover 16, the interface power-off control device 20 controls the load switch 13 to be disconnected, so that the load interface 15 is disconnected from the inverter 10 and the power load 300, so the load interface 15 is powered off (it can also be said to be powered off) at this time, avoiding the user from accidentally touching the energized load interface 15 when the protective cover 16 is not installed on the load interface 15 and causing an electric shock accident. It can be seen that the interface power-off control device 20 provided in the embodiment of the present application can be adapted to the load interface 15, and can realize the on-off control of the load interface 15, thereby reducing the risk of electric shock to the user.

[0052] Further, please refer again to Figure 1 The interface power-off control device 20 includes a detection module 21 and a switch control module 22 .

[0053] The detection module 21 is disposed at the load interface 15, and is used to output a detection signal when the load interface 15 is covered with a protective cover 16. On the contrary, when the load interface 15 is not covered with a protective cover 16, the detection module 21 does not output a detection signal. The detection signal is used to indicate that the load interface 15 is covered with a protective cover 16.

[0054] The switch control module 22 is connected to the detection module 21 and the load switch 13. The switch control module 22 can be used to control the load switch 13 to be turned on when receiving the detection signal, so that power can be transmitted between the load interface 15 and the power load 300. The switch control module 22 is also used to control the load switch 13 to be turned off when no detection signal is received, so that the load interface 15 is powered off.

[0055] In this embodiment, when the protective cover 16 is sleeved outside the load interface 15 (especially when the protective cover 16 and the load interface 15 are connected by a lock), the protective cover 16 will abut against the load interface 15, thereby generating pressure applied to the load interface 15. Therefore, the detection module 21 can use a pressure sensor 211. The type of the pressure sensor 211 can be selected according to actual conditions and is not limited here. Figure 3 As shown, the pressure sensor 211 is disposed at the contact point between the load interface 15 and the protective cover 16. Therefore, the detection signal is the pressure applied by the protective cover 16 to the load interface 15.

[0056] Due to the manufacturing tolerance of the protective cover 16, the installation gap sizes between different positions of the contact between the protective cover 16 and the load interface 15 may be different, which in turn causes different pressure conditions applied by the protective cover 16 to different positions of the contact between the load interface 15. Therefore, the detection conditions of the pressure sensor 211 at different positions will also be different. For example, when the pressure sensor 211 is arranged on the top surface of the load interface 15, the pressure sensor 211 can detect the pressure applied by the protective cover 16. When the pressure sensor 211 is arranged on the bottom surface of the load interface 15, the pressure sensor 211 is not in contact with the protective cover 16, so the pressure sensor 211 does not detect the pressure applied by the protective cover 16. Therefore, in order to avoid misjudgment, the detection module 21 may include P pressure sensors 211, where P is a positive integer not less than 2. And, if Figure 3 As shown, P pressure sensors 211 may be distributed at different positions of the contact between the load interface 15 and the protective cover 16. Such a design may improve the detection accuracy, thereby facilitating the use safety of the inverter 10.

[0057] Correspondingly, the switch control module 22 can receive several detection signals, and control the on / off state of the load switch 13 accordingly according to the reception status of the detection signals, thereby controlling the on / off status of the load interface 15 .

[0058] In this example, see Figure 5 The switch control module 22 may include P sampling circuits 221 , a control circuit 222 and a driving circuit 223 .

[0059] The sampling circuits 221 are connected to the sensors 211 in a one-to-one correspondence. Each sampling circuit 221 is used to collect the detection signal of the connected sensor 211 and output a corresponding sampling signal.

[0060] The control circuit 222 connects each sampling circuit 221 and the driving circuit 223, and the control circuit 222 is used to output a control signal to the driving circuit 223 when receiving the Q-path sampling signal. On the contrary, when the Q-path sampling signal is not received, the control circuit 222 does not output a control signal. Here, Q can be understood as a preset quantity threshold, and Q is a positive integer not less than 2 and not greater than P. It can be set accordingly according to actual conditions and is not limited here.

[0061] The driving circuit 223 is connected to the load switch 13 , and is used to turn on the load switch 13 when receiving a control signal, and to turn off the load switch 13 when not receiving a control signal.

[0062] For ease of understanding, the following Figure 6 The interface power-off control device 20 is further described in detail by taking the circuit shown as an example. Figure 6 , Figure 6FIG. 2 shows only one sensor 211 and one sampling circuit 221. In an actual circuit, there are P sensors 211 and P sampling circuits 221.

[0063] exist Figure 6 In the embodiment, the detection module 21 is a pressure sensor 211. Since the pressure sensor 211 can be equivalent to a capacitor when the charge is accumulated on its electrode surface, the pressure sensor 211 can be equivalent to a charge source and a capacitor in parallel. Therefore, Figure 6 The medium pressure sensor 211 is equivalent to an equivalent circuit in which a voltage source U1 and a capacitor C are connected in series. The load switch 13 is a relay having an induction coil and contacts inside.

[0064] like Figure 6 As shown, the sampling circuit 221 includes a signal amplification circuit. The signal amplification circuit includes an operational amplifier A and resistors R1, R2, R3, R4, R5, and R6. Resistors R1, R2, and R3 constitute a first input circuit, and resistors R4 and R6 constitute a second input resistor R6. Resistor R5 serves as a feedback resistor. The non-inverting input terminal and the inverting input terminal of the operational amplifier A are connected to the two input circuits one by one, and are connected to the pressure sensor 211 through the input circuit. The feedback resistor R5 is connected between the output terminal of the operational amplifier A and one of the input terminals. The output terminal of the operational amplifier A is connected to the control circuit 222. Therefore, the signal amplification circuit can constitute a positive phase amplification circuit or an inverting phase amplification circuit. Of course, in other embodiments, the signal amplification circuit can also use other amplification circuits that can achieve signal amplification.

[0065] The driving circuit 223 includes a voltage conversion circuit 2231, a power tube S1 and a protection circuit 2232. In this embodiment, the voltage conversion circuit 2231 can use any voltage conversion chip with a voltage conversion function, and the control circuit 222 can use any control chip with a control function, which is conducive to the integration and miniaturization design of the switch control module 22. The power tube S1 can be any semiconductor power tube. For the convenience of description, Figure 6 In the example, the power tube S1 is a P-channel MOS tube. The gate of the power tube S1 is the control terminal, the source is the first connection terminal, and the drain is the second connection terminal.

[0066] The input end of the voltage conversion circuit 2231 is connected to the output end of the control circuit 222. The output end of the voltage conversion circuit 2231 is connected to the control end of the power tube S1, the first connection end of the power tube S1 is connected to one end of the induction coil in the load switch 13, and the second connection end of the power tube S1 is grounded. The other end of the induction coil in the load switch 13 can be connected to the DC power supply U2 to access the DC voltage. The DC power supply U2 can be, for example, the DC interface of the inverter 10, the battery pack connected to the DC interface, or an additional power supply that can provide a DC voltage, etc., which is not limited here. One end of the contact of the load switch 13 is connected to the inverter circuit 11, and the other end of the contact of the load switch 13 is connected to the load interface 15.

[0067] The protection circuit 2232 is connected in parallel with the induction coil of the load switch 13. The protection circuit 2232 can protect the power tube S1. Figure 6 In the figure, the protection circuit 2232 includes a reverse protection diode VD1 and a voltage regulator diode DW1 as an example for demonstration. The anode of the reverse protection diode VD1 is connected to one end of the induction coil in the load switch 13 and the first connection end of the power tube S1, the cathode of the reverse protection diode VD1 is connected to the cathode of the voltage regulator diode DW1, and the anode of the voltage regulator diode DW1 is connected to the other end of the induction coil in the load switch 13. The reverse protection diode VD1 can play a role in reverse protection, and the voltage regulator diode DW1 can play a role in overvoltage protection.

[0068] Based on such a design, when the protective cover 16 is removed during the process of the load interface 15 being connected to the electrical load 300, the pressure sensor 211 does not detect the pressure applied by the protective cover 16 to the load interface 15, so no detection signal is generated. The sampling circuit 221 does not generate a sampling signal. Furthermore, the control circuit 222 cannot receive the Q-channel sampling signal, so no control signal is output. Therefore, the voltage conversion circuit 2231 does not work and cannot drive the power tube S1 to turn on. At this time, the induction coil of the load switch 13 and the power tube S1 cannot be connected to form a path, so that the induction coil of the load switch 13 cannot be connected to the DC voltage, and thus cannot generate electromagnetic force to attract the contacts. In other words, the load switch 13 is not connected to the DC voltage and is disconnected. When the load switch 13 is disconnected, the load interface 15 cannot be electrically connected to the inverter circuit 11, so it is powered off, and the inverter 10 cannot power the electrical load 300 through the load switch 13 and the load interface 15. Therefore, there is no risk of electric shock at the load interface 15 at this time.

[0069] When the connection between the load interface 15 and the electrical load 300 is completed, and the load interface 15 is buckled with the protective cover 16, the pressure sensor 211 can detect the pressure applied by the protective cover 16 to the load interface 15, so a detection signal is generated. Once the sampling circuit 221 (i.e., the signal amplification circuit) receives the detection signal output by the sensor 211, it can amplify the detection signal to obtain a corresponding sampling signal. Here, the amplification process is conducive to improving the accuracy of the detection.

[0070] Furthermore, when the number of sampling signals received by the control circuit 222 reaches Q paths, the control circuit 222 outputs a control signal to the voltage conversion circuit 2231. The voltage conversion circuit 2231 can convert the control signal into a control voltage and then output it to the control end of the power tube S1. The power tube S1 is turned on when the control voltage is connected. At this time, the induction coil of the load switch 13 and the power tube S1 can be connected to form a path, so that the induction coil of the load switch 13 can be connected to a DC voltage, so that a current flows through the induction coil, thereby generating an electromagnetic force to attract the contacts. In other words, the load switch 13 is connected to a DC voltage and turned on. Once the load switch 13 is turned on, the load interface 15 can be electrically connected to the inverter circuit 11, so the load interface 15 is energized, and the inverter 10 can supply power to the power load 300 through the load interface 15. It can be understood that the load interface 15 at this time is provided with a protective cover 16, so there is no risk of electric shock to the user.

[0071] It can be seen that the interface power-off control device 20 of the embodiment of the present application can detect the installation status of the protective cover of the load interface 15 to automatically identify the user's loading intention, and then control the power on and off status of the load interface 15 accordingly, thereby effectively reducing the risk of electric shock to the user and improving the safety of use of the inverter 10.

[0072] and, Figure 6 The circuit of the example uses a power tube to connect the load switch 13, and controls the on-off switching of the load switch 13 by the on-off state of the power tube, so that the on-off switching of the load switch 13 can be achieved. Further, the power tube uses a P-type MOS tube. Since the P-type MOS tube itself forms a smaller channel, it can achieve a greater degree of conduction more quickly when receiving the control voltage, so that the current flowing through the induction coil can be increased enough to allow the induction coil to generate an electromagnetic force that can attract the contacts. In addition, the drive circuit 223 is also designed with an anti-reverse diode and a voltage regulator diode to protect the power tube and ensure the normal operation of the circuit.

[0073] Of course, in other embodiments, the detection module 21 may also be composed of P sensors 211 of other types, and the switch control module 22 may also adopt other circuit structures, as long as the switch control module 22 can achieve the corresponding function. For example, in another embodiment, the switch control module 22 may include a control circuit 222 and a drive circuit 223, and the P sampling circuits 221 are omitted. Furthermore, the control circuit 222 connects the P sensors 211 and the drive circuit 223, and the control circuit 222 is used to output a control signal to the drive circuit 223 when a Q-path detection signal is received. On the contrary, when the Q-path detection signal is not received, the control circuit 222 does not output a control signal. The connection relationship and working principle of the drive circuit 223 are the same as Figure 5 The driving circuit 223 shown is the same and will not be described again.

[0074] In addition, an embodiment of the present application also provides an inverter device.

[0075] like Figure 1 As shown, the inverter device 100 includes an inverter 10 and an interface power-off control device 20. The inverter 10 includes an inverter circuit 11, a load switch 13 and a load interface 15, and the load switch 13 is connected between the inverter circuit 11, the load interface 15 and the power load 300. The load interface 15 is used to set a protective cover 16 after connecting to the power load 300.

[0076] The interface power-off control device 20 is connected to the load switch 13. The interface power-off control device 20 can control the load switch 13 to be turned on when the load interface 15 is covered with the protective cover 16, so that power is transmitted between the load interface 15 and the power load 300, and control the load switch 13 to be turned off when the load interface 15 is not covered with the protective cover 16, so that the load interface 15 is powered off.

[0077] It is understandable that the inverter 10 and the interface power-off control device 20 can refer to the aforementioned Figures 1 to 6 The relevant description in will not be repeated here.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An interface power-off control device, characterized in that: Applied to an inverter, the inverter includes an inverter circuit, a load switch and a load interface, the inverter circuit is connected to the load interface through the load switch, and the load interface is used to set a protective cover after connecting to the power load; the interface power-off control device includes: a detection module and a switch control module, wherein, The detection module is disposed at the load interface, and is used to output a detection signal when the load interface is covered with the protective cover; the detection signal is used to indicate that the load interface is covered with the protective cover; The switch control module is connected to the detection module and the load switch. The switch control module is used to control the load switch to be turned on when the detection signal is received, so that power is transmitted between the load interface and the power load; and to control the load switch to be turned off when the detection signal is not received, so that the load interface is powered off.

2. The interface power-off control device according to claim 1, characterized in that: The detection module includes P sensors, where P is a positive integer not less than 2, and each of the sensors is respectively arranged at a contact point between the load interface and the protective cover.

3. The interface power-off control device according to claim 2, characterized in that: The switch control module includes P sampling circuits, a control circuit and a drive circuit; The sampling circuits are connected to the sensors in a one-to-one correspondence, and each sampling circuit is used to collect the detection signal of the connected sensor and output a corresponding sampling signal; The control circuit is connected to each of the sampling circuits and the driving circuit, and is used to output a control signal to the driving circuit when receiving Q sampling signals, where Q is a positive integer not less than 2 and not greater than P; The driving circuit is connected to the load switch, and is used to turn on the load switch when the control signal is received, and to turn off the load switch when the control signal is not received.

4. The interface power-off control device according to claim 3, characterized in that: Each of the sampling circuits includes a signal amplifying circuit, the input end of the signal amplifying circuit is connected to the sensor, the output end of the signal amplifying circuit is connected to the control circuit, and the signal amplifying circuit is used to amplify the detection signal when receiving the detection signal to obtain the sampling signal.

5. The interface power-off control device according to claim 2, characterized in that: The switch control module includes a control circuit and a drive circuit; The control circuit is connected to P sensors and the drive circuit, and is used to output a control signal to the drive circuit when receiving Q detection signals, where Q is a positive integer not less than 2 and not greater than P; The driving circuit is connected to the load switch, and is used to turn on the load switch when the control signal is received, and to turn off the load switch when the control signal is not received.

6. The interface power-off control device according to claim 3 or 5, characterized in that: The driving circuit includes a voltage conversion circuit, a power tube and a protection circuit; The input end of the voltage conversion circuit is connected to the control circuit, and the output end of the voltage conversion circuit is connected to the control end of the power tube. The voltage conversion circuit is used for converting the control signal into a control voltage and outputting it to the control end of the power tube when receiving the control signal; The first connection end of the power tube is connected to the load switch, the second connection end of the power tube is grounded, the load switch is connected in parallel with the protection circuit and is also connected to a DC voltage, the power tube is used to be turned on when the control voltage is connected, so that the load switch is connected to the DC voltage and turned on, and is used to be disconnected when the control voltage is not connected, so that the load switch is not connected to the DC voltage and is disconnected.

7. The interface power-off control device according to claim 2, characterized in that: The sensor is a pressure sensor, and the detection signal is the pressure applied by the protective cover to the load interface.

8. An inverter device, characterized in that: The inverter device comprises: an inverter and an interface power-off control device, wherein: The inverter includes an inverter circuit, a load switch and a load interface, wherein the load switch is connected between the inverter circuit and the load interface, and the load interface is used to be covered with a protective cover after being connected to an electrical load; The interface power-off control device is connected to the load switch, and is used to control the load switch to be turned on when the load interface is covered with the protective cover, so that electric energy is transmitted between the load interface and the electrical load; and is used to control the load switch to be turned off when the load interface is not covered with the protective cover, so that the load interface is powered off.

9. The inverter device according to claim 8, characterized in that: The protective cover is connected to the load interface by means of a lock.

10. The inverter device according to claim 8, characterized in that: The interface power-off control device is at least partially integrated in the inverter.

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