Plugging detection circuit and energy storage device

Abstract

The utility model relates to a plugging detection circuit and energy storage equipment, when a male seat of an external photovoltaic device is not plugged into a female seat, a first signal pin and a second signal pin of the female seat are in an open circuit state, and at the moment, an identification circuit can maintain outputting a second level signal to a controller. And when the male base of the photovoltaic device is inserted into the female base, the first signal pin and the second signal pin of the female base are in a short-circuit state, the identification circuit is grounded through the first signal pin and the second signal pin, and at the moment, the identification circuit changes the type of an output signal, namely, outputs a first level signal to the controller. Therefore, the controller realizes insertion identification in a level signal interruption mode, voltage detection does not need to be carried out in real time, and the power consumption is effectively reduced. When the male seat of the photovoltaic device is completely pulled out, the connection between the bus capacitor and the female seat is disconnected, and the bus capacitor cannot discharge to the female seat, so that no spark is generated, and the plugging safety can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic, in particular to a plug detection circuit and energy storage equipment. BACKGROUND

[0002] With the rapid development of new energy technology, energy storage products with photovoltaic energy storage function are used more and more widely in daily life, which brings great convenience to people. In this type of energy storage products, when the photovoltaic assembly is connected to the energy storage assembly through the photovoltaic terminal, the controller of the energy storage assembly detects that the input voltage is within the product design specification range, and turns on the switch device to start working. When the male seat of the photovoltaic terminal is pulled out of the female seat, the controller detects that the input voltage is not within the product design specification range, and then the switch device is turned off to end the work. This results in a large power consumption and safety problems when the energy storage product is plugged in and out of the interface. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a plug detection circuit and energy storage equipment, which can solve the problems of large power consumption and safety hazards when the energy storage product is plugged in and out of the interface.

[0004] In a first aspect, the present application provides a plug detection circuit applied to an energy storage equipment, wherein the energy storage equipment comprises a female seat for connecting a male seat of an external photovoltaic device, and the female seat comprises a first power pin, a first signal pin and a second signal pin; when the male seat of the photovoltaic device is inserted into the female seat, the first signal pin and the second signal pin are electrically connected; when the male seat of the photovoltaic device is pulled out of the female seat, the first signal pin and the second signal pin are disconnected; and after the first signal pin and / or the second signal pin is disconnected from the male seat of the photovoltaic device, the first power pin is disconnected from the male seat of the photovoltaic device.

[0005] The plug-in detection circuit comprises an identification circuit, a main switch circuit, a first voltage detection circuit and a controller; the identification circuit is electrically connected with the first signal pin, the first power supply and the ground terminal respectively; the identification circuit outputs a first level signal when the first signal pin and the second signal pin are electrically connected, and outputs a second level signal when the first signal pin and the second signal pin are disconnected; the main switch circuit is electrically connected with the first power supply pin and the bus capacitor of the energy storage device respectively; the first voltage detection circuit is electrically connected with the first power supply pin, and is used for detecting the port voltage of the first power supply pin; the controller is electrically connected with the identification circuit, the main switch circuit and the first voltage detection circuit respectively, and is used for turning on the main switch circuit when the first level signal is received and the port voltage meets the preset voltage value range, and turning off the main switch circuit when the second level signal is received.

[0006] In a second aspect, the application further provides an energy storage device, comprising a female seat, a bus capacitor, a direct current conversion circuit and an energy storage battery which are electrically connected with the first power supply pin of the female seat in sequence, and the above-mentioned plug-in detection circuit which is electrically connected with the female seat and the bus capacitor respectively.

[0007] The plug-in detection circuit and the energy storage device described above, when the external photovoltaic device male seat is not inserted into the female seat, the first signal pin and the second signal pin of the female seat are in an open circuit state, at this time the identification circuit can maintain outputting the second level signal to the controller. When the photovoltaic device male seat is inserted into the female seat, the first signal pin and the second signal pin of the female seat are in a short circuit state, the identification circuit is grounded through the first signal pin and the second signal pin, at this time the identification circuit changes the output signal type, that is, outputs the first level signal to the controller. After the controller identifies this state, the port voltage detected by the first voltage detection circuit is obtained, and when the port voltage meets the preset voltage value range, the main switch circuit is turned on to complete the access identification. In this way, the controller realizes the insertion identification in the form of level signal interruption, without real-time voltage detection, effectively reducing the power consumption. When the photovoltaic device male seat is pulled out of the female seat, the first signal pin and the second signal pin of the female seat return to the open circuit state, and after the first signal pin and / or the second signal pin is disconnected with the photovoltaic device male seat, the first power supply pin is disconnected with the photovoltaic device male seat. In this way, when the photovoltaic device male seat is completely pulled out, the connection between the bus capacitor and the female seat has been disconnected, and the bus capacitor cannot discharge to the female seat, so there will be no spark, which can improve the plug-in safety. In this way, the problem of large power consumption and safety hazard of the energy storage product interface during plug-in is solved. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0009] Figure 1 Structure diagram of plug-in detection circuit in an embodiment of the present application;

[0010] Figure 2 Structure diagram of female seat in an embodiment of the present application;

[0011] Figure 3 Structure diagram of female seat in an embodiment of the present application;

[0012] Figure 4 Structure diagram of identification circuit in an embodiment of the present application;

[0013] Figure 5 Structure diagram of identification circuit in another embodiment of the present application;

[0014] Figure 6 Structure diagram of identification circuit in still another embodiment of the present application;

[0015] Figure 7 Structure diagram of voltage detection circuit in an embodiment of the present application;

[0016] Figure 8 Structure diagram of plug-in detection circuit in still another embodiment of the present application;

[0017] Figure 9 Structure diagram of plug-in detection circuit in still another embodiment of the present application.

[0018] Explanation of reference signs:

[0019] 101-identification circuit, 102-controller, 103-main switch circuit, EC1-bus capacitor, Q1-first switch device, C1-first capacitor, DZ-voltage stabilizing diode, D1-first diode, R1-first resistor, R2-second resistor, R3-third resistor; 105-first voltage detection circuit, 107-second voltage detection circuit, 701-first switch circuit, 702-second switch circuit, 801-first drive circuit, 802-second drive circuit, K1-first relay, K2-second relay, D2-second diode, D3-third diode, C2-second capacitor, C3-third capacitor, RS-precharge resistor. DETAILED DESCRIPTION

[0020] For the purpose of understanding the present application, the present application will be described in more detail below with reference to the attached drawings. The attached drawings show embodiments of the present application. However, the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It is noted that the embodiments given herein are only for complete understanding of this application. Therefore, no limitation should be made on the scope of the application based on these embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0022] It is to be understood that the terms "first", "second", and etc. can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor can be called a second resistor without departing from the scope of the present application, and similarly, a second resistor can be called a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0023] It is to be understood that "connection" in the following embodiments, if the circuits, modules, units, etc. connected to each other have transmission of electrical signals or data, it should be understood as "electrically connected", "communicatively connected" and the like.

[0024] It is to be understood that "at least one" means one or more, and "multiple" means two or more. "At least part of an element" means part or all of the element.

[0025] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the term "comprising" or "including" or "having" or the like, specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0026] The insertion / removal detection circuit provided in this application is applied to energy storage devices to detect the insertion / removal between the male connector of an external photovoltaic device and the female connector of the energy storage device. Specifically, in the technical solution of this application, in addition to conventional power supply pins, the male and female connectors of the photovoltaic device are also provided with signal pins for insertion / removal detection, namely, the first and second signal pins of the female connector, and the third and fourth signal pins of the male connector. The second power supply pin of the male connector is connected to the photovoltaic module, while the first power supply pin of the female connector is connected to the energy storage battery through a switch, DC-DC conversion circuit, etc. Thus, when the male connector of the photovoltaic device is connected to the female connector (i.e., the male connector of the photovoltaic device is inserted into the female connector), the electrical energy obtained by photoelectric conversion of the photovoltaic module can be further converted into electrical energy of appropriate voltage and input into the energy storage battery for storage.

[0027] The first and second signal pins are used to interface with the third and fourth signal pins, respectively. A conductive plate is positioned between the first and second signal pins. When the photovoltaic device male connector is inserted, the third and fourth signal pins activate the conductive plate, causing it to short-circuit the first and second signal pins. When the photovoltaic device male connector is removed, the conductive plate returns to its previous state, breaking the connection between the first and second signal pins. Thus, by controlling the continuity between the first and second signal pins, the identification circuit outputs different voltage levels, thereby achieving insertion / removal detection.

[0028] Please see Figure 1 This application provides a plug-in / plug-out detection circuit for use in energy storage devices. The energy storage device includes a female connector for docking with an external photovoltaic device male connector, and the female connector includes a first power supply pin. Figure 1 Taking the positive pin V+ as an example), the first signal pin (i.e. Figure 1 The Signal+ pin and the second signal pin (i.e.) are shown. Figure 1 As shown in the diagram (Signal-), when the male connector of the photovoltaic device is inserted into the female connector, the first signal pin and the second signal pin are electrically connected. When the male connector of the photovoltaic device is pulled out from the female connector, the first signal pin and the second signal pin are electrically disconnected. After the first signal pin and / or the second signal pin are disconnected from the photovoltaic device male connector, the first power pin is disconnected from the photovoltaic device male connector.

[0029] The plug-in detection circuit comprises an identification circuit 101, a main switch circuit 103, a first voltage detection circuit 105 and a controller 102. The identification circuit 101 is electrically connected to a first signal pin, a first power supply (i.e. a 3.3V power supply in FIG. 3) and a ground terminal respectively. The identification circuit 101 is configured to output a first level signal when the first signal pin and a second signal pin are electrically connected, and output a second level signal when the first signal pin and the second signal pin are electrically disconnected. Figure 1 The main switch circuit 103 is electrically connected to the controller 102 and a bus capacitor (i.e. EC1 in FIG. 3) of an energy storage device respectively. The first voltage detection circuit 105 is electrically connected to a first power supply pin. The first voltage detection circuit 105 is configured to detect a port voltage of the first power supply pin. The controller 102 is electrically connected to the identification circuit 101, the main switch circuit 103 and the first voltage detection circuit 105 (connection relationship diagram not shown). The controller 102 is configured to turn on the main switch circuit 103 when receiving the first level signal and the port voltage meets a preset voltage value range, and turn off the main switch circuit 103 when receiving the second level signal.

[0030] Specifically, the identification circuit 101 can output different types of level signals according to the docking state of the male seat (i.e. the male seat in the external photovoltaic device male seat) and the female seat, so as to inform the controller 102 of the insertion and extraction state of the male seat and the female seat. In the embodiment, the identification circuit 101 is configured to output a first level signal (e.g. a low level signal) when the male seat is inserted into the female seat, and output a second level signal (e.g. a high level signal) when the male seat is extracted from the female seat. The main switch circuit 103 is a switch circuit for controlling the photovoltaic assembly of the external photovoltaic device male seat to supply power to the energy storage battery connected at the rear end of the female seat.

[0031] The first voltage detection circuit 105 is configured to detect the output voltage of the photovoltaic assembly in the external photovoltaic device male seat, i.e. the port voltage at the first power supply pin of the female seat. Specifically, in an actual scenario, when the controller 102 receives the second level signal, it indicates that there is no male seat inserted into the female seat at this time, and there is no need for voltage detection. The controller 102 will not start voltage detection. When the controller 102 receives the first level signal, it indicates that the male seat is inserted into the female seat at this time. In order to improve the operation reliability and ensure that the connected male seat can provide sufficient voltage to supply power to the energy storage battery at the rear end of the female seat, the controller 102 will start the voltage detection function at this time.

[0032] That is, in the scheme of the embodiment, when the controller 102 receives the first level signal, instead of directly controlling the main switch circuit 103 to be turned on, the voltage detection function is started, the port voltage is collected by the first voltage detection circuit 105, and compared with the preset product design specification range (i.e. the preset voltage value range). When the port voltage is within the preset product design specification range, the main switch circuit 103 is further controlled to be turned on, and in the case that the port voltage does not meet the above range, even if the male socket is inserted, the main switch circuit 103 will not be turned on.

[0033] When the male socket of the photovoltaic device is pulled out of the female socket, the first signal pin and the second signal pin of the female socket return to the open circuit state. After the first signal pin and / or the second signal pin is disconnected from the electrical connection of the male socket of the photovoltaic device, the first power pin is disconnected from the electrical connection of the male socket of the photovoltaic device. In this way, it is ensured that before the male socket of the photovoltaic device is completely pulled out of the female socket (i.e. the first power pin and the second power pin are disconnected, or the first power pin is disconnected from the electrical connection of the male socket of the photovoltaic device), the controller 102 has controlled the main switch circuit 103 to be turned off.

[0034] It should be pointed out that the type of the controller 102 is not unique, and is not specifically limited, for example, it can be an MCU (Microcontroller Unit), a CPU (Central Process Unit) or a single-chip microcomputer, etc. It can be a device originally used for charge and discharge management of the energy storage device, or an additional independent device, which is not specifically limited.

[0035] The above plug-in detection circuit, when the external male socket of the photovoltaic device is not inserted into the female socket, the first signal pin and the second signal pin of the female socket are in an open circuit state, at this time the identification circuit 101 can maintain outputting the second level signal to the controller 102. When the male socket of the photovoltaic device is inserted into the female socket, the first signal pin and the second signal pin of the female socket are in a short-circuit state, the identification circuit 101 is grounded through the first signal pin and the second signal pin, at this time the identification circuit 101 changes the output signal type, i.e. outputs the first level signal to the controller 102. After the controller 102 recognizes this state, the port voltage detected by the first voltage detection circuit 105 is obtained, and when the port voltage meets the preset voltage value range, the main switch circuit 103 is controlled to be turned on, and the access identification is completed. In this way, the controller 102 realizes the insertion identification in the form of level signal interruption, without real-time voltage detection, effectively reducing the power consumption.

[0036] When the male base of the photovoltaic device is pulled out of the female base, the first signal pin and the second signal pin of the female base return to the open circuit state, and the first power pin is disconnected from the male base of the photovoltaic device after the first signal pin and / or the second signal pin is disconnected from the male base of the photovoltaic device. In this way, when the male base of the photovoltaic device is completely pulled out, the connection between the bus capacitor and the female base is already disconnected, and the bus capacitor cannot discharge to the female base, so that no spark is generated, and the plug-in safety can be improved. In this way, the problem of large power consumption and safety hazards of the energy storage product interface during plugging is solved.

[0037] In one of the embodiments, the lengths of the first signal pin and the second signal pin are less than the length of the first power pin.

[0038] In one of the embodiments, the male base of the photovoltaic device includes the electrically connected photovoltaic assembly and the male base, and the male base includes a second power pin, a third signal pin and a fourth signal pin. The second power pin can be electrically connected to the first power pin, the third signal pin can be electrically connected to the first signal pin, and the fourth signal pin can be electrically connected to the second signal pin. The lengths of the third signal pin and the fourth signal pin are less than the length of the second power pin.

[0039] Specifically, the length of the first power pin refers to the size of the first power pin in the direction in which the male base is connected to the female base. The lengths of the first signal pin and the second signal pin refer to the sizes of the first signal pin and the second signal pin in the direction in which the male base is connected to the female base, which can be the same or different, and the specific values are not limited. Similarly, the lengths of the third signal pin and the fourth signal pin refer to the sizes of the third signal pin and the fourth signal pin in the direction in which the male base is connected to the female base, which can be the same or different. The length of the second power pin refers to the size of the second power pin in the direction in which the male base is connected to the female base.

[0040] For example, in one embodiment, referring to Figure 2 The lengths of the third signal pin (PIN3) and the fourth signal pin (PIN4) can be set to be the same and 5.5 mm.

[0041] In the embodiment, the second power pin refers to the pin of the male base for connecting the photovoltaic assembly and the female base, and the number thereof should include two (positive and negative pins), that is, PIN1 and PIN2 shown in FIG. 2, and the lengths of the two pins can be consistent and set to 9.5 mm.

[0042] The structure of the female base can be combined with reference to Figure 3 Correspondingly, the number of the first power pin is also two, which correspond to the positive and negative pins, that is, the positive and negative poles shown in the figure. In order to facilitate the understanding of the technical solutions of the present application, the following embodiments are all based on the positive pole (that is, the positive pin shown in the figure).Figure 1 the first power pin, and the negative pole of the second power pin is connected to the ground. Figure 1 the first power pin, and the negative pole of the second power pin is connected to the ground.

[0043] In the embodiment, the lengths of the first signal pin and the second signal pin are set to be smaller than the length of the first power pin, and / or the lengths of the third signal pin and the fourth signal pin are set to be smaller than the length of the second power pin. In this way, during the process of pulling out the male socket from the female socket, the electrical connection between the signal pins is disconnected first, i.e., the electrical connection between the first signal pin and / or the second signal pin and the male socket is disconnected first. At this time, the first power pin and the second power pin are still connected, and the controller 102 receives the second level signal and disconnects the main switch circuit 103. When the electrical connection between the first power pin and the second power pin is completely disconnected, the path between the energy storage capacitor and the female socket is cut off, and there is no path for spark discharge, thereby avoiding the generation of spark discharge.

[0044] It should be noted that the specific structure of the identification circuit 101 is not unique, as long as it can identify and output different types of level signals to the controller 102 in the two cases of insertion and pulling out of the male socket from the female socket. For example, please refer to Figure 4 In one embodiment, the identification circuit 101 includes a first switch device Q1 and a first capacitor C1. The control end of the first switch device Q1 is electrically connected to the first power supply and the first signal pin. The first end of the first switch device Q1 is connected to the first power supply, and the first end of the first switch device Q1 is also electrically connected to the first end of the first capacitor C1 and the controller. The second end of the first switch device Q1 is used for grounding, and the second end of the first switch device Q1 is also electrically connected to the second end of the first capacitor C1.

[0045] Specifically, in the embodiment, the identification circuit 101 includes a first switch device Q1 and a first capacitor C1. When the male socket is not inserted into the female socket, the first signal pin and the second signal pin are in an open circuit state, the control end of the first switch device Q1 is pulled up to a high level by the first power supply, and the first switch device Q1 outputs a high level signal, i.e., a second level signal. When the male socket is inserted into the female socket, the first signal pin and the second signal pin are short-circuited, and the control end of the first switch device Q1 is grounded through the second signal pin. At this time, the control end of the first switch device Q1 is pulled down to a low level, and the first switch device Q1 outputs a low level signal, i.e., a first level signal. The controller 102 operates in different modes according to the type of the received level signal, thereby realizing the insertion and pulling out identification of the male socket and the female socket.

[0046] The above scheme forms the identification circuit 101 by the first switch device Q1 and the first capacitor C1, and realizes different level signal output by voltage change of the control end of the first switch device Q1 in the plug-in and plug-out conditions, so that the circuit structure is simple and the circuit cost is effectively saved.

[0047] It can be understood that the type of the first switch device Q1 is not unique, and can be a crystal triode, a field effect transistor or an insulated gate bipolar transistor, and is not limited in particular.

[0048] Please refer to Figure 5 In one of the embodiments, the identification circuit 101 further comprises a zener diode DZ, the cathode of the zener diode DZ is electrically connected to the control end of the first switch device Q1, and the anode of the zener diode DZ is used for grounding.

[0049] Specifically, the zener diode DZ is a diode made by using the phenomenon that the current can change in a large range while the voltage is basically unchanged in the reverse breakdown state of the PN junction. In the embodiment, the zener diode DZ is arranged at the control end of the first switch device Q1, so that the excessive voltage is absorbed when the voltage is too high, the voltage at the control end of the first switch device Q1 is stabilized, and the operation reliability of the first switch device Q1 is improved.

[0050] Please refer to Figure 6 In one of the embodiments, the identification circuit 101 further comprises a first diode D1 and a first resistor R1, the control end of the first switch device Q1 is electrically connected to the first end of the first resistor R1, the second end of the first resistor R1 is electrically connected to the anode of the first diode D1, and the cathode of the first diode D1 is electrically connected to the first signal pin.

[0051] Specifically, in the embodiment, the first diode D1 and the first resistor R1 are arranged between the control end of the first switch device Q1 and the first signal pin. When the male seat is inserted into the female seat, the first diode D1 is turned on to pull down the voltage at the control end of the first switch device Q1. When the male seat is pulled out of the female seat, the first diode D1 is turned off, and the control end of the first switch device Q1 is pulled up by the first power supply. In addition, by arranging the first resistor R1, the current at the control end of the first switch device Q1 can be limited, and the working safety of the first switch device Q1 is further improved.

[0052] The size of the first power supply is not unique, as long as it can turn off the first switch device Q1 when pulled up, for example, it can be set to 3.3V (volt).

[0053] Please refer to Figure 6In one of the embodiments, the identification circuit 101 further comprises a resistor R21 and a resistor R31, the control end of the first switch device Q1 is electrically connected to the first end of the resistor R21 and the first end of the first resistor R1, the second end of the resistor R21 is connected to the first power supply and the first end of the resistor R31, and the second end of the resistor R31 is electrically connected to the first end of the first switch device Q1.

[0054] Specifically, the scheme of the embodiment further comprises the resistor R31 between the first end of the first switch device Q1 and the first power supply and the resistor R21 as a pull-up resistor between the control end of the first switch device Q1 and the first power supply, so as to further improve the operation reliability of the identification circuit 101.

[0055] It can be understood that the first resistor R1, the resistor R21 and the resistor R31 can each be a single resistor or a resistor assembly formed by a plurality of resistors in series and / or parallel, and the specific form is not limited.

[0056] It should be pointed out that the type of the first voltage detection circuit 105 is not unique, and any circuit capable of realizing the voltage acquisition function can be used, for example, in one of the embodiments, a resistor voltage division detection circuit as shown in FIG. 7 can be used. Figure 7 The MPPPT_PVIN end is connected to the first power supply pin, the OUT port is connected to the controller 102, and is used for outputting the acquisition result.

[0057] Please refer to Figure 8 In one of the embodiments, the main switch circuit 103 comprises a first switch circuit 701 and a second switch circuit 702, one end of the first switch circuit 701 and one end of the second switch circuit 702 are respectively connected to the first power supply pin, the other end of the first switch circuit 701 and the other end of the second switch circuit 702 are respectively used for connecting the bus capacitor, the equivalent resistance value of the second switch circuit 702 is greater than the equivalent resistance value of the first switch circuit 701, and the control end of the first switch circuit 701 and the control end of the second switch circuit 702 are respectively electrically connected to the controller 102.

[0058] Specifically, the scheme of the embodiment configures the number of the main switch circuit 103 as two. In an actual scenario, controlling the main switch circuit 103 to turn on includes two actions. One is to first turn on the second switch circuit 702 with a larger equivalent resistance when detecting that the male seat is inserted into the female seat and the port voltage is within the preset product design specification range. At this time, the female bus capacitor can be pre-charged. The other is to turn off the second switch circuit 702 and turn on the first switch circuit 701 when the female bus capacitor charging reaches a certain condition, so that the electric energy is transmitted to the rear-end female bus capacitor through the first switch circuit 701. Controlling the main switch circuit 103 to turn off is to turn off the first switch circuit 701 and the second switch circuit 702 at the same time when detecting that the male seat is pulled out of the female seat. In this way, the pre-charge control of the two main switch circuits 103 effectively improves the operation reliability of power supply.

[0059] Referring to Figure 8 In one of the embodiments, the plug-in detection circuit further includes a second voltage detection circuit 107, which is electrically connected to the bus capacitor and the controller 102 (the connection relationship diagram is not shown).

[0060] The second voltage detection circuit 107 is used to detect the bus voltage of the bus capacitor; the controller 102 is further used to control the second switch circuit 702 to turn on when receiving the first level signal and the port voltage meets the preset voltage value range, and control the first switch circuit 701 to turn on when the bus voltage is greater than or equal to the preset voltage value.

[0061] Specifically, the bus voltage, i.e. the voltage of the bus capacitor, is first controlled to turn on the second switch circuit 702 with a larger equivalent resistance value to charge the bus capacitor during the charging process of the bus capacitor. At this time, the second voltage detection circuit 107 detects the bus voltage in real time and sends it to the controller 102.

[0062] The controller 102 compares and analyzes the bus voltage with the preset voltage value. When the bus voltage is greater than or equal to the preset voltage value, the first switch circuit 701 is switched to charge the bus capacitor. In this way, the charging safety of the bus capacitor can be greatly improved.

[0063] Referring to Figure 9In one of the embodiments, the first switch circuit 701 comprises a first relay K1, a second diode D2, a second capacitor C2 and a first driving circuit 801, a first end of a switch of the first relay K1 is electrically connected to the first power pin, a second end of the switch of the first relay K1 is used for connecting the bus capacitor, a first end of a coil of the first relay K1 is electrically connected to the first driving circuit 801 and an anode of the second diode D2, a second end of the coil of the first relay K1 is electrically connected to a cathode of the second diode D2, and the cathode of the second diode D2 is electrically connected to the second power supply and a first end of the second capacitor C2, a second end of the second capacitor C2 is used for grounding.

[0064] And / or, the second switch circuit comprises a second relay K2, a pre-charge resistor RS, a third diode D3, a third capacitor C3 and a second driving circuit 802; a first end of a switch of the second relay K2 is electrically connected to the first power pin, a second end of the switch of the second relay K2 is used for being electrically connected to the bus capacitor through the pre-charge resistor RS, a first end of a coil of the second relay K2 is electrically connected to the second driving circuit 802 and an anode of the third diode D3, a second end of the coil of the second relay K2 is electrically connected to a cathode of the third diode D3, and the cathode of the third diode D3 is electrically connected to the third power supply and a first end of the third capacitor C3, a second end of the third capacitor C3 is used for grounding.

[0065] Specifically, the scheme of the embodiment takes the first relay K1 and the first driving circuit 801 as the main part of the first switch circuit 701, the first driving circuit 801 can be turned on and turned off under the control of the controller 102, in the case that the first driving circuit 801 is turned on, the coil of the first relay K1 is powered, so that the switch of the first relay K1 is turned on, thereby turning on the first switch circuit 701, and the electric energy is transmitted to the bus capacitor through the first relay K1 to charge the bus capacitor. The scheme can effectively improve the on-off control reliability of the first switch circuit 701.

[0066] In another embodiment, the second relay K2 and the second driving circuit 802 are taken as the main part of the second switch circuit 702, the second driving circuit 802 can be turned on and turned off under the control of the controller 102, in the case that the second driving circuit 802 is turned on, the coil of the second relay K2 is powered, so that the switch of the second relay K2 is turned on, thereby turning on the second switch circuit 702, and the electric energy is transmitted to the bus capacitor through the second relay K2 and the pre-charge resistor RS to charge the bus capacitor. The scheme can effectively improve the on-off control reliability of the second switch circuit 702.

[0067] It should be pointed out that the type of the first driving circuit 801 is not unique, which can be a switching circuit built by a crystal triode, a field effect transistor and the like, and is not specifically limited. For example, in one of the embodiments, the first driving circuit 801 can be a switching circuit built by a field effect transistor, which can be referred to from the following. Figure 9The first driving circuit 801 comprises a second switch device Q2, a fourth capacitor C4 and a second resistor R2. The control terminal of the second switch device Q2 is electrically connected to the first terminal of the second resistor R2. The first terminal of the second resistor R2 is also electrically connected to the first terminal of the fourth capacitor C4. The first terminal of the fourth capacitor C4 is electrically connected to the controller 102 (not shown in the figure). The second terminal of the second switch device Q2 is electrically connected to the anode of the second diode D2 and the first terminal of the coil of the first relay K1. The first terminal of the second switch device Q2, the second terminal of the second resistor R2 and the second terminal of the fourth capacitor C4 are respectively connected to the ground.

[0068] Specifically, the first driving circuit 801 controls the power-on and power-off of the coil of the first relay K1 by itself on-off, thereby realizing the on-off control of the switch of the first relay K1. In the scheme of the embodiment, the controllable second switch device Q2 is used to build the first driving circuit 801. The second resistor R2 and the fourth capacitor C4 are arranged between the control terminal of the first driving circuit 801 and the controller 102, so as to filter and process the control signal input to the second switch device Q2, thereby effectively improving the operation stability of the first driving circuit 801.

[0069] Further, in an embodiment, the first driving circuit 801 further comprises a resistor R11 and a resistor R12. The second terminal of the second switch device Q2 is connected to the anode of the second diode D2 and the first terminal of the coil of the first relay K1 through the resistor R11. The first terminal of the fourth capacitor C4 is electrically connected to the controller 102 (not shown in the figure) through the resistor R12. In this way, the operation reliability of the first driving circuit 801 is improved.

[0070] Similarly, the type of the second driving circuit 802 is not unique. In an embodiment, the second driving circuit can be Figure 9 The second driving circuit comprises a third switch device Q3, a fifth capacitor C5 and a third resistor R3. The control terminal of the third switch device Q3 is electrically connected to the first terminal of the fifth capacitor C5. The first terminal of the fifth capacitor C5 is also electrically connected to the first terminal of the third resistor R3. The first terminal of the third resistor R3 is also electrically connected to the controller 102 (not shown in the figure). The second terminal of the third switch device Q3 is electrically connected to the anode of the third diode D3 and the first terminal of the coil of the second relay K2. The first terminal of the third switch device Q3, the second terminal of the third resistor R3 and the second terminal of the fifth capacitor C5 are respectively connected to the ground.

[0071] Specifically, the second driving circuit 802 controls the power-on and power-off of the coil of the second relay K2 by turning on and off itself, so as to realize the on-off control of the switch of the second relay K2. In the scheme of the embodiment, the third switch device Q3 of a controllable type is used to build the second driving circuit 802, and the third resistor R3 and the fifth capacitor C5 are arranged between the control end of the second driving circuit 802 and the controller 102, so as to filter noise and perform other processing on the control signal input to the third switch device Q3, which can effectively improve the operation stability of the second driving circuit 802.

[0072] Further, in an embodiment, the second driving circuit 802 further includes the resistor R13 and the resistor R14, the second end of the third switch device Q3 is connected to the anode of the third diode D3 and the first end of the coil of the second relay K2 through the resistor R13, and the first end of the third resistor R3 is electrically connected to the controller 102 (not shown in the figure) through the resistor R14. In this way, the operation reliability of the second driving circuit 802 is improved.

[0073] In an embodiment, in order to improve the operation safety of the plug detection circuit, a fuse can also be arranged between the main switch circuit 103 and the first power pin, and when the charging current is too high, the charging connection can be disconnected by fusing the fuse, so as to avoid damage to the circuit device caused by high current charging.

[0074] In order to facilitate understanding of the technical scheme of the present application, the present application will be explained and described in detail below in combination with more detailed embodiments.

[0075] In the embodiment, the male seat includes two power pins and two signal pins, the lengths of the signal pins are less than the lengths of the power pins, the power pins of the male seat are connected to the photovoltaic module, the female seat includes a power pin and two signal pins, the identification circuit 101 includes the first switch device Q1, the first capacitor C1, the first diode D1, the first resistor R1, the resistor R21 and the resistor R31, the main switch circuit 103 includes the first switch circuit 701 and the second switch circuit 702, the first switch circuit 701 includes the first relay K1, the first driving circuit 801, the second diode D2 and the second capacitor C2, the second switch circuit 702 includes the second relay K2, the second driving circuit 802, the third capacitor C3, the third diode D3 and the pre-charge resistor RS. The first voltage detection circuit 105 is connected at the first power pin, the second voltage detection circuit 107 is connected at the direct current capacitor, and the two voltage detection circuits are respectively connected to the controller 102.

[0076] In the normal state, the male seat is not inserted into the female seat, at this time, the first signal pin and the second signal pin are open, the control end of the first switch device Q1 is pulled up to high level by the first power supply, at this time, the first switch device Q1 is not conductive, the identification circuit 101 outputs a high level signal to the controller 102, and the controller 102 does not act at this time, that is, the voltage detection is not started.

[0077] When the male seat is inserted into the female seat, the conductive sheet is actuated due to the insertion of the two signal pins, so that the first signal pin and the second signal pin are short-circuited by the conductive sheet, at this time, the control end of the first switch device Q1 is pulled down to low level, the first switch device Q1 is conductive, and the identification circuit 101 switches to output a low level signal to the controller 102. After that, the controller 102 starts the voltage detection function, collects the port voltage through the first voltage detection circuit 105, and judges whether it is within the product design specification range. If it is within the range, the second switch circuit 702 is controlled to be conductive to pre-charge the bus capacitor with a small current, at this time, the controller 102 synchronously starts the voltage detection operation of the bus capacitor. If it is not within the range, the first switch circuit 701 and the second switch circuit 702 do not need to be controlled to be conductive.

[0078] The controller 102 collects the voltage of the bus capacitor and analyzes whether the voltage reaches the set voltage value within a fixed time, if yes, the second switch circuit 702 is controlled to be turned off, and the first switch circuit 701 is controlled to be conductive to continue charging the bus capacitor with a large current; if not, the second switch circuit 702 is controlled to be turned off, and the plug-in detection operation is ended.

[0079] During the insertion operation, the controller 102 also acquires the level signal output by the identification circuit 101 in real time, if a high level is received, it indicates that the male seat is pulled out of the female seat at this time, and since the first signal pin and the second signal pin are shorter than the first power supply pin (or the third signal pin and the fourth signal pin are shorter than the second power supply pin), the signal pins are disconnected first during the pulling-out process, and the power supply pin is still connected at this time. After the controller 102 receives the high level, the first switch circuit 701 is immediately turned off, and the first switch circuit 701 has been turned off before the power supply pin is completely pulled out, at this time, the loop between the bus capacitor and the female seat has been disconnected, and the bus capacitor cannot discharge to the female seat, and there will be no spark.

[0080] In the second aspect, the application also provides a kind of energy storage equipment, comprising: female seat, bus capacitor, direct current conversion circuit and energy storage battery connected with the first power supply pin of female seat in turn, and the plug-in detection circuit described above.

[0081] Specifically, the plug-in detection circuit and its operating principle are as described above in various embodiments and shown in the drawings, which will not be repeated here. Among them, the back end of the bus capacitor of the energy storage device is also configured with a direct current conversion circuit, which can convert the direct current power into a suitable size and then deliver it to the energy storage battery of the energy storage device for storage. The direct current conversion circuit can be a Buck circuit (a direct current conversion circuit with output voltage lower than input voltage), a Boost circuit (a direct current conversion circuit with output voltage higher than input voltage), or a Buck-Boost circuit (a direct current conversion circuit with output voltage lower than or higher than input voltage), etc., which is not limited in particular. The type of energy storage device is not unique, as long as it can be connected to a photovoltaic module and store its power, such as a portable outdoor power supply, etc., which is not limited in particular.

[0082] When the external photovoltaic device public seat is not inserted into the female seat, the first signal pin and the second signal pin of the female seat are in an open circuit state, and at this time the identification circuit 101 can maintain the output of the second level signal to the controller 102. When the photovoltaic device public seat is inserted into the female seat, the first signal pin and the second signal pin of the female seat are in a short circuit state, and the identification circuit 101 is grounded through the first signal pin and the second signal pin. At this time, the identification circuit 101 changes the type of output signal, i.e. outputs the first level signal to the controller 102. After the controller 102 recognizes this state, it acquires the port voltage detected by the first voltage detection circuit 105. When the port voltage meets the pre-set voltage value range, the controller 102 controls the main switch circuit 103 to be turned on, and the connection recognition is completed. In this way, the controller 102 realizes the insertion recognition in the form of level signal interruption, without the need for real-time voltage detection, effectively reducing power consumption.

[0083] When the photovoltaic device public seat is pulled out of the female seat, the first signal pin and the second signal pin of the female seat return to an open circuit state. After the first signal pin and / or the second signal pin is disconnected from the electrical connection of the photovoltaic device public seat, the first power pin is disconnected from the electrical connection of the photovoltaic device public seat. In this way, when the photovoltaic device public seat is completely pulled out, the connection between the bus capacitor and the female seat has been disconnected, and the bus capacitor cannot discharge to the female seat, so there will be no spark, which can improve the plug-in safety. In this way, the problem of large power consumption and safety hazards of the energy storage product interface during plug-in is solved.

[0084] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0085] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application encompasses all such possible combinations.

[0086] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A plug detection circuit, characterized by, The application is applied to a storage device, which comprises a female seat for connecting an external photovoltaic device male seat, the female seat comprising a first power pin, a first signal pin and a second signal pin; when the photovoltaic device male seat is inserted into the female seat, the first signal pin and the second signal pin are electrically connected, when the photovoltaic device male seat is pulled out of the female seat, the first signal pin and the second signal pin are disconnected, and after the first signal pin and / or the second signal pin is disconnected with the photovoltaic device male seat, the first power pin is disconnected with the photovoltaic device male seat; The plug-in detection circuit comprises: An identification circuit, which is electrically connected with the first signal pin, the first power supply and the ground, respectively; the identification circuit outputs a first level signal when the first signal pin and the second signal pin are electrically connected, and outputs a second level signal when the first signal pin and the second signal pin are disconnected; A main switch circuit, which is electrically connected with the first power pin and the bus capacitor of the storage device, respectively; A first voltage detection circuit, which is electrically connected with the first power pin, and is used for detecting the port voltage of the first power pin; A controller, which is electrically connected with the identification circuit, the main switch circuit and the first voltage detection circuit, respectively; the controller turns on the main switch circuit when receiving the first level signal and the port voltage meets the preset voltage value range, and turns off the main switch circuit when receiving the second level signal.

2. The plug detection circuit according to claim 1, characterized in that, The length of the first signal pin and the second signal pin is less than the length of the first power pin; And / or, the photovoltaic device male seat comprises an electrically connected photovoltaic assembly and a male seat, the male seat comprising a second power pin, a third signal pin and a fourth signal pin; the second power pin can be electrically connected with the first power pin, the third signal pin can be electrically connected with the first signal pin, and the fourth signal pin can be electrically connected with the second signal pin, wherein the length of the third signal pin and the fourth signal pin is less than the length of the second power pin.

3. The plug detection circuit of claim 1, wherein The identification circuit comprises a first switch device and a first capacitor, the control end of the first switch device is electrically connected with the first power supply and the first signal pin, the first end of the first switch device is electrically connected with the first power supply, the first end of the first switch device is also electrically connected with the first end of the first capacitor and the controller, the second end of the first switch device is used for grounding, and the second end of the first switch device is also electrically connected with the second end of the first capacitor.

4. The plug detection circuit according to claim 3, characterized in that, The identification circuit further comprises a Zener diode, a first diode and a first resistor, a cathode of the Zener diode is electrically connected to a control end of the first switch device and a first end of the first resistor, and an anode of the Zener diode is grounded; the control end of the first switch device is further electrically connected to the first end of the first resistor, a second end of the first resistor is electrically connected to an anode of the first diode, and a cathode of the first diode is electrically connected to the first signal pin.

5. The plug detection circuit according to any one of claims 1 to 4, characterized in that, The main switch circuit comprises a first switch circuit and a second switch circuit, one end of the first switch circuit and one end of the second switch circuit are respectively electrically connected to the first power pin, the other end of the first switch circuit and the other end of the second switch circuit are respectively used for connecting the bus capacitor, an equivalent resistance of the second switch circuit is greater than an equivalent resistance of the first switch circuit, and a control end of the first switch circuit and a control end of the second switch circuit are respectively electrically connected to the controller.

6. The plug detection circuit of claim 5, wherein, The plug detection circuit further comprises a second voltage detection circuit, the second voltage detection circuit is electrically connected to the bus capacitor and the controller, and the second voltage detection circuit is used for detecting a bus voltage of the bus capacitor; the controller is further used for controlling the second switch circuit to be turned on when the first level signal is received and the port voltage meets a preset voltage value range, and controlling the first switch circuit to be turned on when the bus voltage is greater than or equal to a preset voltage value.

7. The plug detection circuit of claim 5, wherein, The first switch circuit comprises a first relay, a second diode, a second capacitor and a first driving circuit; a first end of a switch of the first relay is electrically connected to the first power pin, a second end of the switch of the first relay is used for connecting the bus capacitor, a first end of a coil of the first relay is electrically connected to the first driving circuit and an anode of the second diode, a second end of the coil of the first relay is electrically connected to a cathode of the second diode, the cathode of the second diode is electrically connected to a second power supply and a first end of the second capacitor, and a second end of the second capacitor is grounded; and / or, The second switch circuit comprises a second relay, a pre-charge resistor, a third diode, a third capacitor and a second driving circuit; a first end of a switch of the second relay is electrically connected to the first power pin, a second end of the switch of the second relay is used for being electrically connected to the bus capacitor through the pre-charge resistor, a first end of a coil of the second relay is electrically connected to the second driving circuit and an anode of the third diode, a second end of the coil of the second relay is electrically connected to a cathode of the third diode, the cathode of the third diode is electrically connected to a third power supply and a first end of the third capacitor, and a second end of the third capacitor is grounded.

8. The plug detection circuit of claim 7, wherein, The first driving circuit comprises a second switch device, a fourth capacitor and a second resistor, a control end of the second switch device is electrically connected with a first end of the second resistor, the first end of the second resistor is also electrically connected with a first end of the fourth capacitor, the first end of the fourth capacitor is electrically connected with the controller, a second end of the second switch device is electrically connected with an anode of the second diode and a first end of a coil of the first relay, and a first end of the second switch device, a second end of the second resistor and a second end of the fourth capacitor are grounded respectively.

9. The plug detection circuit of claim 7, wherein, The second driving circuit comprises a third switch device, a fifth capacitor and a third resistor, a control end of the third switch device is electrically connected with a first end of the fifth capacitor, the first end of the fifth capacitor is also electrically connected with a first end of the third resistor, the first end of the third resistor is also electrically connected with the controller, a second end of the third switch device is electrically connected with an anode of the third diode and a first end of a coil of the second relay, and a first end of the third switch device, a second end of the third resistor and a second end of the fifth capacitor are grounded respectively.

10. An energy storage device, characterized by, It comprises: a female seat; a bus capacitor, a direct current conversion circuit and an energy storage battery which are electrically connected with a first power supply pin of the female seat in sequence; and the plug detection circuit of any one of claims 1-9 which are electrically connected with the female seat and the bus capacitor respectively.

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