Load identification circuit and energy storage power supply

Abstract

The utility model discloses a load identification circuit and an energy storage power supply, the energy storage power supply comprises an interface, a grounding end, a battery management circuit and a battery, the interface is provided with a first end and a second end, the anode of the battery is connected with the first end, and the cathode of the battery is connected with the grounding end. The negative electrode of the battery, the grounding end and the second end are respectively connected with the battery management circuit, and the load identification circuit comprises a first power supply end used for outputting a first voltage signal; the first switch circuit is used for being in a conducting state when a controlled end receives a first voltage signal transmitted by the first end and the second end, and outputting an identification signal through a first conducting end; and the main control circuit is used for determining the access of an external load when receiving the identification signal. The utility model aims to improve the identification speed of energy storage power supply load access.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage power supply circuits, in particular to a load identification circuit and an energy storage power supply. Background Art

[0002] At present, outdoor energy storage power supplies or household energy storage power products are used as power transmission devices. When electronic devices are connected to the energy storage power supply via a USB cable, the energy storage power supply needs to automatically identify the load access action and turn on the power supply system to charge these electronic devices. Traditional energy storage power supplies usually adopt active identification solutions, button control or positive terminal identification based on negative terminal identification solutions. However, this type of solution has the disadvantages of poor anti-static discharge capability, inability to identify isolated bidirectional architecture circuits, inability to determine the short-circuit load removal status when the end is short-circuited, and slow load removal response. In other words, the energy storage power supply is not sensitive to load identification and there are safety hazards. Utility Model Content

[0003] The main purpose of the utility model is to provide a load identification circuit, aiming to improve the identification speed of energy storage power supply load access.

[0004] To achieve the above-mentioned purpose, the load identification circuit proposed in the utility model is applied to an energy storage power supply, the energy storage power supply includes an interface, a ground terminal, a battery management circuit and a battery, the interface has a first end and a second end, the positive electrode of the battery is connected to the first end, the negative electrode of the battery, the ground terminal and the second end are respectively connected to the battery management circuit, and the load identification circuit includes:

[0005] a first power supply terminal, the first power supply terminal being connected to the first terminal and being used to output a first voltage signal; when an external load is connected to the interface, the first voltage signal is output to the battery management circuit via the first terminal and the second terminal, so that the battery management circuit conducts a path between the ground terminal and the negative electrode of the battery;

[0006] a first switch circuit, wherein a first conducting end is connected to the first power supply end via a pull-up circuit, a second conducting end is connected to the ground end, and a controlled end is connected to the second end; and is configured to be in a conducting state when the controlled end receives a first voltage signal transmitted via the first end and the second end, and output an identification signal via the first conducting end;

[0007] The main control circuit has a positive power supply terminal connected to the first power supply terminal, a negative power supply terminal connected to the ground terminal, an identification signal receiving terminal connected to the first conduction terminal of the first switch circuit, and is used to determine the external load connection when receiving the identification signal.

[0008] Preferably, the first switch circuit includes a first resistor, a second resistor, a third resistor, a first switch tube, and a first capacitor;

[0009] Among them, the first end of the first resistor is connected to the second end, the second end of the first resistor is connected to the first end of the second resistor and the controlled end of the switch tube; the second end of the second resistor is connected to the second conduction end of the first switch tube and the ground end; the first end of the third resistor is connected to the first power supply end, and the second end of the third resistor is connected to the first conduction end of the first switch tube; the first end of the first capacitor is connected to the first end of the first resistor, and the second end of the first capacitor is connected to the second end of the first resistor.

[0010] Preferably, the load identification circuit also includes a signal processing circuit, an input end of the signal processing circuit is connected to the first switching circuit, and an output end of the signal processing circuit is connected to the battery management circuit; the signal processing circuit is used to convert the first voltage signal transmitted through the first end, the load and the second end into a single pulse signal and output it to the battery management circuit when an external load is connected to the interface, so that the battery management circuit can conduct the path between the ground end and the negative pole of the battery.

[0011] Preferably, the signal processing circuit includes a fourth resistor, a second switch tube, a second capacitor, and a first diode;

[0012] Among them, the first end of the fourth resistor is connected to the first switch circuit and the first conduction end of the second switch tube, the second end of the fourth resistor is connected to the controlled end of the second switch tube and the first end of the second capacitor; the second end of the second capacitor is connected to the second conduction end of the second switch tube and the anode of the first diode; the cathode of the first diode is connected to the battery management circuit.

[0013] Preferably, the load identification circuit further comprises a unidirectional conduction circuit, the input end of the unidirectional conduction circuit is connected to the output end of the first power supply end, and the output end of the unidirectional conduction circuit is connected to the first end; the unidirectional conduction circuit is used to limit the current flow direction.

[0014] Preferably, the load identification circuit also includes a second switch circuit, a first conduction end of the second switch circuit is connected to the first power supply end, and a second conduction end is connected to the battery management circuit; and is used to turn on / off the path between the first power supply end and the battery management circuit when receiving a second switch control signal output by the main control circuit.

[0015] Preferably, the load identification circuit also includes a third switch circuit, a first conduction end of the third switch circuit is connected to the second end, a second conduction end is connected to the ground end, and a controlled end is connected to the main control circuit; and is used to turn on / off the path between the second end and the ground end when receiving a third switch control signal output by the main control circuit.

[0016] Preferably, the load identification circuit further includes a clamping circuit, a first end of the clamping circuit is connected to the second end, and a second end of the clamping circuit is connected to the ground end; and is used for circuit protection.

[0017] Preferably, the load identification circuit also includes a key switch circuit, the input end of the key switch circuit is connected to the first power supply end, and the key switch circuit is electrically connected to the battery management circuit and the main control circuit respectively; and is used to, when triggered, conduct the path between the first power supply end and the battery management circuit, and output a corresponding key trigger signal to the main control circuit.

[0018] The utility model also provides an energy storage power supply, which includes a load identification circuit as described in any one of the above items.

[0019] Preferably, the battery management circuit comprises:

[0020] Battery management control circuit;

[0021] a fourth switch circuit, wherein a controlled end of the fourth switch circuit is connected to the signal processing circuit, the key switch circuit, and the third switch circuit, a first conductive end is connected to the battery management control circuit, and the second conductive end is connected to the negative electrode of the battery; and is configured to be in a conductive state and output an activation signal when the controlled end receives a first voltage signal;

[0022] A fifth switch circuit, wherein the controlled end of the fifth switch circuit is connected to the battery management control circuit, the first conduction end of the fifth switch circuit is connected to the ground end, the second conduction end of the fifth switch circuit is connected to the second conduction end of the fourth switch circuit; and is used to open / close the connection between the negative pole of the battery and the ground end.

[0023] The technical solution of the utility model adopts a load identification circuit. Among them, when the energy storage power supply interface is connected to the load. The first power supply end will output a first voltage signal and pass through the first end, the load and the second end at the interface, and then input to the first switch circuit. The first switch circuit receives the first voltage signal, so that the first switch circuit is in a conductive state. In addition, the identification signal receiving end of the main control circuit is connected to the first power supply end through the pull-up resistor of the first switch circuit. When the first switch circuit is turned on and grounded, the identification signal receiving end of the main control circuit will produce a level change. The main control circuit confirms the connection of the external load through the level change. The problem of slow voltage drop in the load identification at the first end, which leads to slow identification speed, can be avoided by the identification method of the second end. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a load identification circuit of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the main control circuit of the utility model;

[0027] Figure 3 It is a structural schematic diagram of another embodiment of the load identification circuit of the utility model;

[0028] Figure 4 It is a structural schematic diagram of an energy storage power supply according to an embodiment of the utility model.

[0029] Description of Figure Numbers:

[0030] Label name Label name VDD First power supply terminal 90 Battery Management Circuit 10 First switch circuit 91 Battery management control circuit 20 Main control circuit 92 Fourth switch circuit 30 Signal processing circuit 93 Fifth switch circuit 40 One-way conduction circuit R1-R13 The first resistor - the thirteenth resistor 50 Second switch circuit Q1-Q7 The first switch tube - the seventh switch tube 60 The third switch circuit C1-C3 First capacitor - third capacitor 70 Clamping circuit D1-D6 The first diode - the sixth diode 80 Push button switch circuit TVS1-TVS2 First TVS tube - Second TVS tube

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] At present, outdoor energy storage power supplies or household energy storage power products are used as power transmission devices. When electronic devices are connected to the energy storage power supply via a USB cable, the energy storage power supply needs to automatically identify the load access action and turn on the power supply system to charge these electronic devices. Traditional energy storage power supplies usually adopt active identification solutions, button control or positive terminal identification based on negative terminal identification solutions. However, this type of solution has the disadvantages of poor anti-static discharge capability, inability to identify isolated bidirectional architecture circuits, inability to determine the short-circuit load removal status when the end is short-circuited, and slow load removal response. In other words, the energy storage power supply is not sensitive to load identification and there are safety hazards.

[0036] Therefore, reference Figures 1 to 4 The utility model proposes a load identification circuit, which is applied to an energy storage power supply. The energy storage power supply includes an interface, a ground terminal, a battery management circuit 90 and a battery. The interface has a first terminal and a second terminal. The positive electrode of the battery is connected to the first terminal, and the negative electrode of the battery, the ground terminal and the second terminal are respectively connected to the battery management circuit 90. The load identification circuit includes:

[0037] a first power supply terminal VDD, the first power supply terminal VDD is connected to the first terminal and is used to output a first voltage signal; when an external load is connected to the interface, the first voltage signal is output to the battery management circuit 90 via the first terminal and the second terminal, so that the battery management circuit 90 conducts a path between the ground terminal and the negative electrode of the battery;

[0038] A first switch circuit 10, wherein a first conduction end is connected to the first power supply end VDD via a pull-up circuit, a second conduction end is connected to the ground end, and a controlled end is connected to the second end; and is configured to be in a conduction state when the controlled end receives a first voltage signal transmitted via the first end and the second end, and output an identification signal via the first conduction end;

[0039] The main control circuit 20 has a positive power supply terminal connected to the first power supply terminal VDD, a negative power supply terminal connected to the ground terminal, an identification signal receiving terminal connected to the first conduction terminal of the first switch circuit 10, and is used to determine the external load connection when receiving the identification signal.

[0040] It should be understood that when the energy storage power supply outputs the power supply voltage to the load, it is necessary to convert the output power supply voltage through the voltage conversion circuit. Among them, the voltage conversion circuit is a DC to DC voltage conversion circuit. The voltage conversion circuit can be implemented by a buck circuit (the average value of the output voltage is always lower than the average value of its input voltage), a boost / buck circuit (the average value of the output voltage can be lower or higher than the average value of its input voltage) and a boost circuit (the average value of the output voltage is always higher than the average value of the input voltage). Specifically, the input end of the voltage conversion circuit is connected to the positive pole of the battery, and the output end is connected to the first end of the interface to realize the conversion of the output power supply voltage of the power supply. In addition, the voltage conversion circuit is also connected to the ground terminal.

[0041] In this embodiment, the first power supply terminal VDD is connected to the output terminal of another voltage conversion circuit, so that the positive electrode of the battery outputs a first voltage signal through the output terminal of the voltage conversion circuit. Specifically, when a load is connected to the energy storage power interface, the first end of the interface is connected to the second end. The first voltage signal output by the first power supply terminal VDD passes through the first end of the interface, the load and the second end in turn, and is then input to the battery management circuit 90. After receiving the first voltage signal, the battery management circuit 90 conducts the path between the ground terminal and the negative electrode of the battery, so that the battery starts to supply power to the main control circuit 20.

[0042] In this embodiment, the first switch circuit 10 can be implemented by using MOS tubes, IGBT tubes, thyristors, triodes, power tubes, etc. The first conduction end of the first switch circuit 10 is connected to the output end of the first power supply end VDD through a pull-up resistor. When the interface is connected to the load, the first voltage signal output by the first power supply end VDD is input to the first switch circuit 10 through the first end, the load and the second end at the interface. The first voltage signal will control the controlled end of the first switch circuit 10 so that the first conduction end of the first switch circuit 10 is connected to the second conduction end and grounded. At this time, the second end of the pull-up resistor in the first switch circuit 10 is in a low level state, and the level change will be output to the main control circuit 20 as an identification signal, so that the main control circuit 20 performs corresponding actions according to the identification signal.

[0043] In this embodiment, the main control circuit 20 can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc. Specifically, the main control circuit 20 is provided with an identification signal receiving end, which is arranged at the second end of the pull-up resistor in the first switch circuit 10, that is, the first conduction end of the first switch circuit 10. When the first switch circuit 10 is turned on, the level of the identification signal receiving end changes, and the level change is received by the main control circuit 20 to determine the access of the external load. Among them, when the first voltage signal is not output to the battery management circuit 90, the main control circuit 20 has no power input and is in an inoperative state.

[0044] In this embodiment, when the energy storage power supply interface is connected to the load. The first power supply terminal VDD will output a first voltage signal and pass through the first end, the load and the second end at the interface, and then input to the first switch circuit 10. The first switch circuit 10 is in a conducting state by receiving the first voltage signal. In addition, the identification signal receiving end of the main control circuit 20 is connected to the first power supply terminal VDD via the pull-up resistor of the first switch circuit 10. When the first switch circuit 10 is turned on and grounded, the identification signal receiving end of the main control circuit 20 will produce a level change. The main control circuit 20 confirms the connection of the external load through the level change. The problem of slow voltage drop in the load identification at the first end, resulting in slow identification speed, can be avoided by the identification method of the second end.

[0045] refer to Figure 3In one embodiment of the utility model, the first switch circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a first switch tube Q1, and a first capacitor C1;

[0046] Among them, the first end of the first resistor R1 is connected to the second end, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the controlled end of the switch tube; the second end of the second resistor R2 is connected to the second conduction end of the first switch tube Q1 and the ground end; the first end of the third resistor R3 is connected to the first power supply end VDD, and the second end of the third resistor R3 is connected to the first conduction end of the first switch tube Q1; the first end of the first capacitor C1 is connected to the first end of the first resistor R1, and the second end of the first capacitor C1 is connected to the second end of the first resistor R1.

[0047] In this embodiment, the third resistor R3 is a pull-up resistor of the first switch circuit 10, so that the main control circuit 20 receives the initial identification signal. The controlled end of the first switch tube Q1 is connected to the second end of the interface through the first resistor R1, and the first conduction end and the second conduction end are turned on by receiving the first voltage signal, so that the first power supply end VDD is connected to the ground end through the first switch tube Q1, and then the high level of the signal identification end of the main control circuit 20 is pulled to a low level. The main control circuit 20 knows whether the load is connected to the interface through the change of high and low levels. In addition, the first capacitor C1 is connected to the controlled end of the first switch tube Q1 to achieve the purpose of accelerating the identification speed of the main control circuit 20.

[0048] refer to Figure 3 to Figure 4 In one embodiment of the utility model, the load identification circuit also includes a signal processing circuit 30, the input end of the signal processing circuit 30 is connected to the first switch circuit 10, and the output end of the signal processing circuit 30 is connected to the battery management circuit 90; the signal processing circuit 30 is used to convert the first voltage signal transmitted through the first end, the load and the second end into a single pulse signal when an external load is connected to the interface, and output it to the battery management circuit 90, so that the battery management circuit 90 conducts the path between the ground end and the negative pole of the battery.

[0049] The signal processing circuit 30 includes a fourth resistor R4, a second switch tube Q2, a second capacitor C2, and a first diode D1;

[0050] Among them, the first end of the fourth resistor R4 is connected to the first switch circuit 10 and the first conduction end of the second switch tube Q2, the second end of the fourth resistor R4 is connected to the controlled end of the second switch tube Q2 and the first end of the second capacitor C2; the second end of the second capacitor C2 is connected to the second conduction end of the second switch tube Q2 and the anode of the first diode D1; the cathode of the first diode D1 is connected to the battery management circuit 90.

[0051] In this embodiment, the signal strength of the first voltage signal is weakened after passing through the first end of the interface, the load and the second end. Therefore, in order to ensure that the first voltage signal can effectively conduct the path between the ground terminal and the negative electrode of the battery when it is output to the battery management circuit 90, it is necessary to perform signal processing on the first voltage signal. Through the fourth resistor R4, the second switch tube Q2 and the second capacitor C2, the first voltage signal input to the signal processing circuit 30, which is a long pulse signal, is converted into a single pulse signal and output to the battery management circuit 90, so that the battery management circuit 90 can effectively conduct the path between the ground terminal and the negative electrode of the battery. In addition, in this embodiment, in order to prevent the problem of backflow in the signal processing circuit 30, a first diode D1 is provided at the second conduction end of the second switch tube Q2 to achieve unidirectional conduction.

[0052] refer to Figure 3 to Figure 4 In one embodiment of the utility model, the load identification circuit also includes a unidirectional conduction circuit 40, the input end of the unidirectional conduction circuit 40 is connected to the output end of the first power supply end VDD, and the output end of the unidirectional conduction circuit 40 is connected to the first end; the unidirectional conduction circuit 40 is used to limit the current flow direction.

[0053] In this embodiment, the output end of the first power supply terminal VDD is connected to the first end of the interface. In addition, the first end of the interface is also connected to the power supply end of the battery through the voltage conversion circuit. While the battery is supplying power to the load, the charge therein will also flow into the first power supply terminal VDD through the first end of the interface. Therefore, it is necessary to set a set of unidirectional conduction circuits 40 between the output end of the first power supply terminal VDD and the first end of the interface to prevent backflow to the first power supply terminal VDD. Among them, the unidirectional conduction circuit 40 can adopt a diode circuit. Specifically, the diode is the second diode D2. The anode of the second diode D2 is connected to the output end of the first power supply terminal VDD, and the cathode is connected to the first end of the interface, thereby achieving a technical effect with anti-backflow.

[0054] refer to Figure 3 to Figure 4In one embodiment of the utility model, the load identification circuit also includes a second switch circuit 50, a first conduction end of the second switch circuit 50 is connected to the first power supply end VDD, and a second conduction end is connected to the battery management circuit 90; and is used to turn on / off the path between the first power supply end VDD and the battery management circuit 90 when receiving a second switch control signal output by the main control circuit 20.

[0055] The second switch circuit 50 includes a fifth resistor R5, a sixth resistor R6, and a third switch tube Q3. The first end of the sixth resistor R6 is connected to the first power supply terminal VDD and the first conduction end of the third switch tube Q3, and the second end of the sixth resistor R6 is connected to the second end of the fifth resistor R5 and the controlled end of the third switch tube Q3; the first end of the fifth resistor R5 is connected to the main control circuit 20; the second conduction end of the third switch tube Q3 is connected to the input end of the battery management circuit 90 and the output end of the signal processing circuit 30. In addition, a fourth diode D4 and a third diode D3 are respectively provided at the output end of the third switch circuit 60 and the output end of the signal processing circuit 30 to enable unidirectional conduction.

[0056] In this embodiment, the second switch circuit 50 can be implemented by using MOS tubes, IGBT tubes, thyristors, triodes, power tubes, etc. When the interface is connected to the load, and the first switch circuit 10 outputs the identification signal for the main control circuit 20 to receive, the main control circuit 20 will output a control signal to the controlled end of the second switch circuit 50, so that the second switch circuit 50 conducts the path between the first power supply terminal VDD and the battery management circuit 90. At this time, the first voltage signal output by the first power supply terminal VDD can be output to the battery management circuit 90 through the second switch circuit 50, so that the battery management circuit 90 continues to conduct the path between the ground terminal and the negative pole of the battery. When the interface is connected to the load and unplugged, the first end and the second end of the interface will be in a disconnected state. Therefore, the first voltage signal will not be able to be input to the first switch circuit 10 through the first end and the second end of the interface. At this time, the first switch circuit 10 will be in a closed state, thereby causing the low-level signal at the identification signal receiving end to be converted into a high-level signal. This level signal will be received by the main control circuit 20 as an identification signal and control the second switch tube Q2 to disconnect the path between the first power supply terminal VDD and the battery management circuit 90. After the battery management circuit 90 fails to continuously receive the first voltage signal, it will disconnect the path between the ground terminal and the negative electrode of the battery, so that the battery will no longer output the supply voltage.

[0057] refer to Figure 3 to Figure 4In one embodiment of the utility model, the load identification circuit also includes a third switch circuit 60, a first conduction end of the third switch circuit 60 is connected to the second end, a second conduction end is connected to the ground end, and a controlled end is connected to the main control circuit 20; and is used to turn on / off the path between the second end and the ground end when receiving a third switch control signal output by the main control circuit 20.

[0058] The third switch circuit 60 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a fourth switch tube Q4. The first end of the seventh resistor R7 is connected to the main control circuit 20, and the second end is connected to the first end of the eighth resistor R8 and the controlled end of the fourth switch tube Q4; the second end of the eighth resistor R8 is connected to the second end of the ninth resistor R9 and the ground end; the first end of the ninth resistor R9 is connected to the second conductive end of the fourth switch tube Q4; and the first conductive end of the fourth switch tube Q4 is connected to the second end of the interface.

[0059] In this embodiment, the third switch circuit 60 can be implemented by using MOS tubes, IGBT tubes, thyristors, triodes, power tubes, etc. When the main control circuit 20 recognizes that a load is connected to the energy storage power supply, it will output a control signal to the third switch circuit 60, so that the third switch circuit 60 conducts the path between the second end of the interface and the ground end. After the interface is connected to the load, the second end of the interface is connected to the ground end, thereby powering on the load.

[0060] Optionally, the load identification circuit further includes a clamp circuit 70, a first end of the clamp circuit 70 is connected to the second end, and a second end of the clamp circuit 70 is connected to the ground end; and is used for circuit protection.

[0061] In this embodiment, the clamping circuit 70 can be implemented by using the first TVS tube TVS1 circuit. By connecting the first end of the first TVS tube TVS1 to the second end at the interface, and the second end to the ground, when the interface is connected to the load, the circuit is protected from the influence of sudden voltage or current spikes, thereby achieving a protective effect.

[0062] refer to Figure 3 to Figure 4 In one embodiment of the utility model, the load identification circuit also includes a key switch circuit 80, the input end of the key switch circuit 80 is connected to the first power supply end VDD, and the key switch circuit 80 is electrically connected to the battery management circuit 90 and the main control circuit 20 respectively; and is used to conduct the path between the first power supply end VDD and the battery management circuit 90 when triggered, and output a corresponding key trigger signal to the main control circuit 20.

[0063] In this embodiment, the key switch circuit 80 includes a tenth resistor R10, an eleventh resistor R11, and a key switch. The first end of the tenth resistor R10 is connected to the main control circuit 20; the second end is connected to the second end of the key switch and the first end of the eleventh resistor R11; the second end of the eleventh resistor R11 is connected to the ground; and the first end of the key switch is connected to the output end of the first power supply terminal VDD. In addition, the second end of the key switch is provided with a fifth diode D5 and a sixth diode D6, respectively, to achieve unidirectional conduction between the battery management circuit 90 and the tenth resistor R10 and the eleventh resistor R11. In actual application, the user can control the battery management circuit 90 to start by closing the key switch circuit 80 to conduct the path between the first power supply terminal VDD and the battery management circuit 90, so as to enable the battery to output the supply voltage. The supply voltage output by the battery will cause the voltage of the tenth resistor R10 and the eleventh resistor R11 to change, and the change will be input into the main control circuit 20 as another identification signal. The main control circuit 20 controls the second switch circuit 50 to be turned on through the identification signal, so that the battery management circuit 90 continuously turns on the path between the ground terminal and the negative electrode of the battery. When the user can disconnect the path between the first power supply terminal VDD and the battery management circuit 90 through the key switch circuit 80, the voltage of the tenth resistor R10 and the eleventh resistor R11 will change again, and the change will be input into the main control circuit 20 as another identification signal. The main control circuit 20 controls the second switch circuit 50 to be turned off through the identification signal, so that the battery management circuit 90 disconnects the path between the ground terminal and the negative electrode of the battery, and realizes the output of the battery shutdown power supply voltage.

[0064] The utility model also proposes an energy storage power supply, wherein the energy storage power supply includes any one of the load identification circuits described above. It is worth noting that since the energy storage power supply of the utility model is based on the load identification circuit described above, the embodiments of the energy storage power supply of the utility model include all technical solutions of all embodiments of the load identification circuit described above, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0065] refer to Figure 4 In one embodiment of the present utility model, the battery management circuit 90 includes:

[0066] Battery management control circuit 91;

[0067] A fourth switch circuit 92, wherein a controlled end of the fourth switch circuit 92 is connected to the signal processing circuit 30, the key switch circuit 80, and the third switch circuit 60, a first conductive end is connected to the battery management control circuit 91, and a second conductive end is connected to the negative electrode of the battery; and is configured to be in a conductive state and output an activation signal when the controlled end receives a first voltage signal / long pulse signal;

[0068] A fifth switch circuit 93, wherein the controlled end of the fifth switch circuit 93 is connected to the battery management control circuit 91, the first conductive end of the fifth switch circuit 93 is connected to the ground end, the second conductive end of the fifth switch circuit 93 is connected to the second conductive end of the fourth switch circuit 92; and is used to open / close the connection between the negative pole of the battery and the ground end.

[0069] In this embodiment, the battery management control circuit 91 can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc., so as to output a corresponding control signal when receiving a corresponding signal.

[0070] In this embodiment, the fourth switch circuit 92 can be implemented by MOS tube, IGBT tube, thyristor, triode, power tube, etc. The fourth switch circuit 92 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor, a fifth switch tube Q5, a second TVS tube TVS2, and a third capacitor C3. Among them, the first end of the twelfth resistor R12 is connected to the cathode of the third diode D3 and the cathode of the fourth diode D4, and the second end is connected to the first end of the third capacitor C3, the first end of the second TVS tube TVS2, the first end of the thirteenth resistor R13, and the controlled end of the fifth switch tube Q5; the second end of the third capacitor C3, the second end of the second TVS tube TVS2, the second end of the thirteenth resistor R13, and the second conduction end of the fifth switch tube Q5 are connected to the ground end of the battery management system; the first conduction end of the fourth switch tube Q4 is connected to the battery management control circuit 91. When the fourth switch circuit 92 receives the first voltage signal, it will turn on the fifth switch tube Q5, so that the battery management control circuit 91 receives the relevant signal, thereby outputting the corresponding control signal.

[0071] In this embodiment, the fifth switch circuit 93 includes a sixth switch tube Q6 and a seventh switch tube Q7. The sixth switch tube Q6 and the seventh switch tube Q7 together form a group of back-to-back MOS tube switch circuits. The controlled ends of the sixth switch tube Q6 and the seventh switch tube Q7 are connected to the battery management control circuit 91. The first conduction end of the sixth switch tube Q6 is connected to the ground end, and the second end is connected to the first conduction end of the seventh switch tube Q7. The second conduction end of the seventh switch tube Q7 is connected to the negative electrode of the battery. When the fifth switch circuit 93 receives the control signal output by the battery management control circuit 91, it turns on / off the path between the negative electrode of the battery and the ground end, thereby controlling whether the battery power supply voltage is output or not.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A load identification circuit, applied to energy storage power supply, characterized in that: The energy storage power supply includes an interface, a ground terminal, a battery management circuit and a battery, the interface has a first terminal and a second terminal, the positive electrode of the battery is connected to the first terminal, the negative electrode of the battery, the ground terminal and the second terminal are respectively connected to the battery management circuit, and the load identification circuit includes: a first power supply terminal, the first power supply terminal being connected to the first terminal and being used to output a first voltage signal; when an external load is connected to the interface, the first voltage signal is output to the battery management circuit via the first terminal and the second terminal, so that the battery management circuit conducts a path between the ground terminal and the negative electrode of the battery; a first switch circuit, wherein a first conducting end is connected to the first power supply end via a pull-up circuit, a second conducting end is connected to the ground end, and a controlled end is connected to the second end; and is configured to be in a conducting state when the controlled end receives a first voltage signal transmitted via the first end and the second end, and output an identification signal via the first conducting end; The main control circuit has a positive power supply terminal connected to the first power supply terminal, a negative power supply terminal connected to the ground terminal, an identification signal receiving terminal connected to the first conduction terminal of the first switch circuit, and is used to determine the external load connection when receiving the identification signal.

2. The load identification circuit according to claim 1, characterized in that: The first switch circuit includes a first resistor, a second resistor, a third resistor, a first switch tube, and a first capacitor; Among them, the first end of the first resistor is connected to the second end, the second end of the first resistor is connected to the first end of the second resistor and the controlled end of the switch tube; the second end of the second resistor is connected to the second conduction end of the first switch tube and the ground end; the first end of the third resistor is connected to the first power supply end, and the second end of the third resistor is connected to the first conduction end of the first switch tube; the first end of the first capacitor is connected to the first end of the first resistor, and the second end of the first capacitor is connected to the second end of the first resistor.

3. The load identification circuit according to claim 1, characterized in that: The load identification circuit also includes a signal processing circuit, the input end of the signal processing circuit is connected to the first switching circuit, and the output end of the signal processing circuit is connected to the battery management circuit; the signal processing circuit is used to convert the first voltage signal transmitted through the first end, the load and the second end into a single pulse signal when an external load is connected to the interface, and output it to the battery management circuit, so that the battery management circuit can conduct the path between the ground end and the negative pole of the battery.

4. The load identification circuit according to claim 3, characterized in that: The signal processing circuit includes a fourth resistor, a second switch tube, a second capacitor, and a first diode; Among them, the first end of the fourth resistor is connected to the first switch circuit and the first conduction end of the second switch tube, the second end of the fourth resistor is connected to the controlled end of the second switch tube and the first end of the second capacitor; the second end of the second capacitor is connected to the second conduction end of the second switch tube and the anode of the first diode; the cathode of the first diode is connected to the battery management circuit.

5. The load identification circuit according to claim 1, characterized in that: The load identification circuit also includes a unidirectional conduction circuit, the input end of the unidirectional conduction circuit is connected to the output end of the first power supply end, and the output end of the unidirectional conduction circuit is connected to the first end; the unidirectional conduction circuit is used to limit the current flow direction.

6. The load identification circuit according to claim 1, characterized in that: The load identification circuit also includes a second switch circuit, a first conduction end of the second switch circuit is connected to the first power supply end, and a second conduction end is connected to the battery management circuit; and is used to turn on / off the path between the first power supply end and the battery management circuit when receiving a second switch control signal output by the main control circuit.

7. The load identification circuit according to any one of claims 1 to 6, characterized in that: The load identification circuit also includes a third switch circuit, a first conduction end of the third switch circuit is connected to the second end, a second conduction end is connected to the ground end, and a controlled end is connected to the main control circuit; and is used to turn on / off the path between the second end and the ground end when receiving a third switch control signal output by the main control circuit.

8. The load identification circuit according to claim 7, characterized in that: The load identification circuit also includes a clamping circuit, a first end of the clamping circuit is connected to the second end, and a second end of the clamping circuit is connected to the ground end; and is used for circuit protection.

9. The load identification circuit according to any one of claims 1 to 6, characterized in that: The load identification circuit also includes a key switch circuit, the input end of the key switch circuit is connected to the first power supply end, and the key switch circuit is electrically connected to the battery management circuit and the main control circuit respectively; and is used to, when triggered, conduct the path between the first power supply end and the battery management circuit, and output a corresponding key trigger signal to the main control circuit.

10. An energy storage power supply, characterized in that: The energy storage power supply includes a load identification circuit as described in any one of claims 1-9.

11. The energy storage power supply according to claim 10, characterized in that: The battery management circuit comprises: Battery management control circuit; a fourth switch circuit, wherein a controlled end of the fourth switch circuit is connected to the signal processing circuit, the key switch circuit, and the third switch circuit, a first conductive end is connected to the battery management control circuit, and the second conductive end is connected to the negative electrode of the battery; and is configured to be in a conductive state and output an activation signal when the controlled end receives a first voltage signal; A fifth switch circuit, wherein the controlled end of the fifth switch circuit is connected to the battery management control circuit, the first conduction end of the fifth switch circuit is connected to the ground end, the second conduction end of the fifth switch circuit is connected to the second conduction end of the fourth switch circuit; and is used to open / close the connection between the negative pole of the battery and the ground end.

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