Over-voltage and under-voltage detection circuits, power management devices

Abstract

The present application relates to the technical field of voltage detection, and discloses an over-voltage and under-voltage detection circuit and a power management device. The circuit includes: an over-voltage and under-voltage comparison circuit, which is used to compare an over-voltage threshold signal or an under-voltage threshold signal with an input signal according to a first preset signal; the input signal is a signal input to a signal comparison terminal of the over-voltage and under-voltage comparison circuit; a first energy storage detection circuit, which is connected to the over-voltage and under-voltage comparison circuit, and is also configured to be connected to the positive electrode of the first energy storage module; the first energy storage detection circuit is used to input the first voltage of the first energy storage module to the signal comparison terminal according to a second preset signal; the second energy storage detection circuit is connected to the over-voltage and under-voltage comparison circuit, and is also configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the first energy storage module; the second energy storage detection circuit is used to input the second voltage of the second energy storage module to the signal comparison terminal according to a third preset signal. In this way, the cost of detecting over-voltage and under-voltage conditions of multiple energy storage modules can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of voltage detection, and in particular to an over-voltage and under-voltage detection circuit and a power management device. Background Art

[0002] At present, there is a demand for overvoltage detection and undervoltage detection of energy storage modules. In the related art, an overvoltage detection circuit and an undervoltage detection circuit are usually set for each energy storage module to detect the overvoltage and undervoltage conditions of a single energy storage module. However, setting an overvoltage detection circuit and an undervoltage detection circuit for each energy storage module is costly.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] The embodiments of the present application provide an over-voltage and under-voltage detection circuit and a power management device, so as to reduce the cost of detecting over-voltage and under-voltage of an energy storage module.

[0006] The embodiment of the present application provides an over-voltage and under-voltage detection circuit, including: an over-voltage and under-voltage comparison circuit, the over-voltage and under-voltage comparison circuit is used to receive an overvoltage threshold signal, an undervoltage threshold signal and a first preset signal, and compare the overvoltage threshold signal or the undervoltage threshold signal with an input signal according to the first preset signal; the input signal is a signal input to a signal comparison end of the over-voltage and under-voltage comparison circuit; a first energy storage detection circuit, the first energy storage detection circuit is connected to the over-voltage and under-voltage comparison circuit, and is also configured to be connected to a positive electrode of a first energy storage module; the first energy storage detection circuit is used to receive a second preset signal, and input a first voltage of the first energy storage module to the signal comparison end according to the second preset signal; a second energy storage detection circuit, the second energy storage detection circuit is connected to the over-voltage and under-voltage comparison circuit, and is also configured to be connected to a positive electrode of a second energy storage module and a positive electrode of the first energy storage module; the second energy storage detection circuit is used to receive a third preset signal, and input a second voltage of the second energy storage module to the signal comparison end according to the third preset signal.

[0007] In the above-mentioned embodiment, whether to perform undervoltage comparison or overvoltage comparison is selected by the first preset signal, and the voltages to be compared of the two energy storage modules are input into the over- and undervoltage comparison circuit respectively at different time periods by the second preset signal and the third preset signal. It is possible to perform over- and undervoltage comparison on the two energy storage modules when only a single over- and undervoltage comparison circuit is provided, instead of providing an overvoltage detection circuit and an undervoltage detection circuit for each energy storage module respectively, which can reduce the cost of detecting over- and undervoltage conditions of multiple energy storage modules. Moreover, since only a single over- and undervoltage comparison circuit is provided, the circuit structure for over- and undervoltage detection is simple, which facilitates reducing the area occupied by the over- and undervoltage detection circuit in the chip.

[0008] Optionally, the over-voltage and under-voltage comparison circuit includes: a first selector, wherein the first input end of the first selector is used to receive the over-voltage threshold signal; the second input end of the first selector is used to receive the under-voltage threshold signal; the selection end of the first selector is used to receive the first preset signal; a comparator, wherein the first input end of the comparator is connected to the output end of the first selector; the second input end of the comparator is the signal comparison end; and the output end of the comparator is used to output the over-voltage and under-voltage comparison result.

[0009] In the above embodiment, a first selector is provided, which can select to output an overvoltage threshold signal or an undervoltage threshold signal to the comparator for comparison through a first preset signal, thereby realizing overvoltage and undervoltage judgment of the energy storage module in one comparator.

[0010] Optionally, the first energy storage detection circuit includes: a first resistor, a first end of the first resistor is connected to the positive electrode of the first energy storage module; a second resistor, a first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded; a second selector, a first input end of the second selector is connected to the second end of the first resistor; the second input end of the second selector is suspended; the selection end of the second selector is used to receive a second preset signal; and the output end of the second selector is connected to the signal comparison end.

[0011] In the above implementation, the second selector can be protected by setting the first resistor, and the engineer can adjust the voltage value to be compared according to the set overvoltage threshold signal and undervoltage threshold signal, thereby making the circuit more flexible. The second selector can be set to select whether to output the voltage representing the first energy storage module to the comparator for comparison through the second preset signal, thereby facilitating the overvoltage and undervoltage judgment of multiple energy storage modules in one comparator.

[0012] Optionally, the second energy storage detection circuit includes: a first voltage-dividing circuit, which is configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the first energy storage module; the first voltage-dividing circuit is used to divide the voltage output by the positive electrode of the second energy storage module, and output the second voltage of the second energy storage module through the output end of the first voltage-dividing circuit; a first detection circuit, which is connected to the output end of the first voltage-dividing circuit and the over-voltage and under-voltage comparison circuit, and the first detection circuit is used to receive the third preset signal, and input the second voltage to the signal comparison end according to the third preset signal.

[0013] It can be understood that when the first energy storage module and the second energy storage module are connected in series, the voltage output by the positive electrode of the second energy storage module is actually the sum of the voltages of the first energy storage module and the second energy storage module. In this way, the voltage is divided by the first voltage divider circuit so that the voltage input to the first detection circuit for judgment is the voltage of the second energy storage module, thereby accurately judging the over-voltage or under-voltage condition of the second energy storage module.

[0014] Optionally, the first voltage-dividing circuit includes: a third resistor, a first end of the third resistor is connected to the positive electrode of the first energy storage module; a first operational amplifier, a first input end of the first operational amplifier is connected to the second end of the third resistor, and a ground end of the first operational amplifier is grounded; a fourth resistor, a first end of the fourth resistor is connected to the positive electrode of the second energy storage module, and a second end of the fourth resistor is connected to the second input end of the first operational amplifier; a first controlled switch, a control end of the first controlled switch is connected to the output end of the first operational amplifier, and a first end of the first controlled switch is connected to the second end of the fourth resistor; the second end of the first controlled switch serves as the output end of the first voltage-dividing circuit.

[0015] In the above embodiment, by setting the third resistor, the current flowing through the first operational amplifier of the first energy storage module can be limited to protect the first operational amplifier. By setting the first operational amplifier and the first controlled switch, the voltage of the first input terminal of the first operational amplifier can be equal to the first voltage of the first energy storage module, so that the divided voltage of the fourth resistor is equal to the second voltage of the second energy storage module. At the same time, by setting the first operational amplifier and the first controlled switch, the current flowing through the fourth resistor can be controlled to be consistent with the current flowing through the first resistor.

[0016] Optionally, the first detection circuit includes: a fifth resistor, a first end of the fifth resistor is connected to the output end of the first voltage divider circuit; a sixth resistor, a first end of the sixth resistor is connected to the second end of the fifth resistor; a first trimming resistor, a first end of the first trimming resistor is connected to the second end of the sixth resistor, and the second end of the first trimming resistor is grounded; a third selector, a first input end of the third selector is connected to the second end of the fifth resistor; the second input end of the third selector is left floating; the selection end of the third selector is used to receive a third preset signal; the output end of the third selector is connected to the signal comparison end.

[0017] In the above implementation, by setting the sixth resistor and the first trimming resistor, engineers can adjust the voltage value to be compared according to the set overvoltage threshold signal and undervoltage threshold signal, thereby making the circuit more flexible. A third selector is set to select whether to output the voltage representing the second energy storage module to the comparator for comparison through a third preset signal, thereby facilitating overvoltage and undervoltage judgment of multiple energy storage modules in one comparator.

[0018] Optionally, the over- and under-voltage detection circuit further includes: a third energy storage detection circuit, which is connected to the over- and under-voltage comparison circuit and the second energy storage detection circuit, and is also configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the third energy storage module; the third energy storage detection circuit is used to receive a fourth preset signal and a fifth preset signal, and input the second voltage or the third voltage of the third energy storage module into the signal comparison terminal according to the fourth preset signal and the fifth preset signal.

[0019] In the above-mentioned embodiment, the third energy storage detection circuit can input the second voltage or the third voltage of the third energy storage module to the signal comparison end according to the fourth preset signal and the fifth preset signal, and by adjusting the fifth preset signal, when the first energy storage module, the second energy storage module and the third energy storage module are present, that is, when there are three strings of batteries, only the third energy storage module is judged to be over-voltage or under-voltage. When only the first energy storage module and the second energy storage module are present, that is, when only two strings of batteries are present, only the second energy storage module is judged to be over-voltage or under-voltage. Thus, in the case of only setting up one circuit, it can be applicable to the scenario of over-voltage or under-voltage detection of two strings of batteries, and the scenario of over-voltage or under-voltage detection of three strings of batteries.

[0020] Optionally, the third energy storage detection circuit includes: a second voltage-dividing circuit, which is configured to be connected to the positive electrode of the third energy storage module and the positive electrode of the second energy storage module; the second voltage-dividing circuit is used to divide the voltage output by the positive electrode of the third energy storage module, and output the third voltage through the output end of the second voltage-dividing circuit; a selection detection circuit, which is connected to the output end of the second voltage-dividing circuit, the over-voltage and under-voltage comparison circuit and the second energy storage detection circuit, and the selection detection circuit is used to receive the fourth preset signal and the fifth preset signal, and input the third voltage or the second voltage to the signal comparison end according to the fourth preset signal and the fifth preset signal.

[0021] In the above embodiment, it can be understood that when the first energy storage module, the second energy storage module and the third energy storage module are connected in series, the voltage output by the positive electrode of the third energy storage module is actually the sum of the voltages of the first energy storage module, the second energy storage module and the third energy storage module. In this way, the voltage is divided by the second voltage divider circuit so that the voltage judged by the input selection detection circuit is the voltage of the third energy storage module, so that when the third energy storage module needs to be judged as over-voltage or under-voltage, the over-voltage or under-voltage condition of the third energy storage module can be accurately judged.

[0022] Optionally, the second voltage-dividing circuit includes: a seventh resistor, a first end of the seventh resistor is connected to the positive electrode of the second energy storage module; a second operational amplifier, a first input end of the second operational amplifier is connected to the second end of the seventh resistor; a second controlled switch, a first end of the second controlled switch is connected to the ground end of the second operational amplifier, and a control end of the second controlled switch is connected to the second energy storage detection circuit; a second end of the second controlled switch is grounded; an eighth resistor, a first end of the eighth resistor is connected to the positive electrode of the third energy storage module, and a second end of the eighth resistor is connected to the second input end of the second operational amplifier; a third controlled switch, a control end of the third controlled switch is connected to the output end of the second operational amplifier, and a first end of the third controlled switch is connected to the second end of the eighth resistor; the second end of the third controlled switch serves as the output end of the second voltage-dividing circuit.

[0023] In the above embodiment, by setting the seventh resistor, the current flowing through the second operational amplifier of the second energy storage module can be limited to protect the second operational amplifier. By setting the second operational amplifier, the second controlled switch and the third controlled switch, the voltage of the first input terminal of the second operational amplifier can be equal to the voltage of the positive output of the second energy storage module, so that the divided voltage of the eighth resistor is equal to the third voltage of the third energy storage module. At the same time, by setting the second operational amplifier and the third controlled switch, the current flowing through the fourth resistor can be controlled to be consistent with the current flowing through the eighth resistor.

[0024] Optionally, the selection detection circuit includes: a ninth resistor, a first end of the ninth resistor is connected to the output end of the second voltage divider circuit; a tenth resistor, a first end of the tenth resistor is connected to the second end of the ninth resistor; a second trimming resistor, a first end of the second trimming resistor is connected to the second end of the tenth resistor, and the second end of the second trimming resistor is grounded; a fourth selector, a first input end of the fourth selector is connected to the second end of the ninth resistor; the selection end of the fourth selector is used to receive the fifth preset signal; the output end of the fourth selector is connected to the signal comparison end of the over-voltage and under-voltage comparison circuit; a fifth selector, and the output end of the fifth selector is connected to the second input end of the fourth selector; the first input end of the fifth selector is connected to the second energy storage detection circuit; the second input end of the fifth selector is suspended, and the selection end of the fifth selector is used to receive the fourth preset signal.

[0025] In the above embodiment, a fourth selector and a fifth selector are provided, which can select to output the voltage representing the second energy storage module or the voltage representing the third energy storage module through the fifth preset signal and the fourth preset signal to the comparator for comparison, thereby facilitating over-voltage and under-voltage judgment of multiple energy storage modules in one comparator.

[0026] Optionally, the selection detection circuit also includes: a first AND gate, the first input end of the first AND gate is used to receive the fourth preset signal, and the second input end of the first AND gate is used to receive the sixth preset signal; the output end of the first AND gate is connected to the selection end of the fourth selector; the signal output by the output end of the first AND gate is the fifth preset signal.

[0027] In the above embodiment, in combination with the fourth preset signal of the first AND gate, the sixth preset signal and the fourth preset signal of the fifth selector, the circuit can still be used to perform over-voltage and under-voltage judgment on the first energy storage module and the second energy storage module in the absence of the third energy storage module, thereby improving the scope of use of the over-voltage and under-voltage detection circuit.

[0028] Optionally, the over-voltage and under-voltage detection circuit further includes: a signal output module, configured to generate the first preset signal, the second preset signal, the third preset signal and the fourth preset signal.

[0029] In the above implementation, the first preset signal, the second preset signal, the third preset signal and the fourth preset signal can be easily generated by the signal output module.

[0030] An embodiment of the present application provides a power management device, including the above-mentioned over-voltage and under-voltage detection circuit.

[0031] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0033] Figure 1 It is a structural schematic diagram of a first over-voltage and under-voltage detection circuit provided in an embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of a second over-voltage and under-voltage detection circuit provided in an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of the connection relationship of the energy storage modules provided in the embodiment of the present application;

[0036] Figure 4 is a structural schematic diagram of a third over-voltage and under-voltage detection circuit provided in an embodiment of the present application;

[0037] Figure 5 is a structural diagram of a signal output module provided in an embodiment of the present application;

[0038] Figure 6 is a schematic diagram of a simulation waveform of an output signal provided in an embodiment of the present application;

[0039] Figure 7 It is a schematic diagram of a simulation waveform of another output signal provided in an embodiment of the present application.

[0040] Reference numerals:

[0041] 1: Over-voltage and under-voltage comparison circuit; 2: First energy storage detection circuit; 3: Second energy storage detection circuit; 4: Positive electrode of the first energy storage module; 5: Positive electrode of the second energy storage module; 6: First selector; 7: Comparator; 8: Second selector; 9: First resistor; 10: Second resistor; 11: Third resistor; 12: First operational amplifier; 13: Fourth resistor; 14: First PMOS tube; 15: Fifth resistor; 16: Sixth resistor; 17: First trimming resistor; 18: Third selector; 19: Eleventh resistor; 20: Second operational amplifier ; 21: the eighth resistor; 22: the seventh resistor; 23: the second PMOS tube; 24: the third PMOS tube; 25: the ninth resistor; 26: the tenth resistor; 27: the second adjustment resistor; 28: the first AND gate; 29: the fourth selector; 30: the fifth selector; 31: the twelfth resistor; 32: the oscillator; 33: the first D flip-flop; 34: the second D flip-flop; 35: the third D flip-flop; 36: the fourth D flip-flop; 37: the second AND gate; 38: the third AND gate; 39: the fourth AND gate; 40: the fifth AND gate; 41: the OR gate. DETAILED DESCRIPTION

[0042] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0043] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0045] Unless otherwise stated, the term "plurality" means two or more.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0047] Embodiment 1

[0048] Combination Figure 1 As shown, an over-voltage and under-voltage detection circuit is provided in an embodiment of the present application, including: an over-voltage and under-voltage comparison circuit 1, a first energy storage detection circuit 2, and a second energy storage detection circuit 3. Among them, the over-voltage and under-voltage comparison circuit 1 is used to receive an overvoltage threshold signal, an undervoltage threshold signal and a first preset signal, and compare the overvoltage threshold signal or the undervoltage threshold signal with the input signal according to the first preset signal, and the input signal is a signal input to the signal comparison end of the over-voltage and under-voltage comparison circuit 1. The first energy storage detection circuit 2 is connected to the over-voltage and under-voltage comparison circuit 1, and is also configured to be connected to the positive electrode 4 of the first energy storage module. The first energy storage detection circuit 2 is used to receive the second preset signal, and input the first voltage of the first energy storage module to the signal comparison end according to the second preset signal. The second energy storage detection circuit 3 is connected to the over-voltage and under-voltage comparison circuit 1, and is also configured to be connected to the positive electrode 5 of the second energy storage module and the positive electrode of the first energy storage module. The second energy storage detection circuit 3 is used to receive a third preset signal, and input the second voltage of the second energy storage module to the signal comparison end according to the third preset signal.

[0049] It can be understood that, in some embodiments, when the third preset signal is at a high level, the second preset signal is at a low level.

[0050] In some embodiments, the over-voltage and under-voltage comparison circuit may include: a first selector and a comparator. The first input end of the first selector is used to receive an overvoltage threshold signal, the second input end of the first selector is used to receive an undervoltage threshold signal, and the selection end of the first selector is used to receive a first preset signal. The first input end of the comparator is connected to the output end of the first selector, the second input end of the comparator is a signal comparison end, and the output end of the comparator is used to output the over-voltage and under-voltage comparison result.

[0051] It can be understood that using a single comparator to compare two signals can obtain signal comparison results at a lower cost. Engineers can also use other circuits that can perform signal comparison according to the actual needs of the circuit, which is not limited here. Similarly, engineers can also design a circuit with the same function as the first selector to replace the first selector, which is not limited here.

[0052] For example, assuming that the normal voltage is 3.6V (volts), the overvoltage threshold signal is set to 4.2V, and the undervoltage threshold signal is set to 2.4V. If the voltage input to the signal comparison terminal exceeds 4.2V, it is determined to be overvoltage. If the voltage input to the signal comparison terminal is lower than 2.4V, it is determined to be undervoltage.

[0053] In some embodiments, the first energy storage detection circuit may include: a first resistor, a second resistor, and a second selector. The first end of the first resistor is connected to the positive electrode of the first energy storage module. The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is grounded. The first input end of the second selector is connected to the second end of the first resistor, the second input end of the second selector is suspended, the selection end of the second selector is used to receive the second preset signal, and the output end of the second selector is connected to the signal comparison end.

[0054] In some embodiments, the second energy storage detection circuit may include: a first voltage divider circuit and a first detection circuit. The first voltage divider circuit is configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the first energy storage module; the first voltage divider circuit is used to divide the voltage output by the positive electrode of the second energy storage module, and output the second voltage of the second energy storage module through the output end of the first voltage divider circuit. The first detection circuit is connected to the output end of the first voltage divider circuit and the over-voltage and under-voltage comparison circuit, and the first detection circuit is used to receive a third preset signal, and input the second voltage to the signal comparison end according to the third preset signal.

[0055] In an optional manner of the above embodiment, the first voltage divider circuit may include: a third resistor, a first operational amplifier, a fourth resistor and a first controlled switch. The first end of the third resistor is connected to the positive electrode of the first energy storage module. The first input end of the first operational amplifier is connected to the second end of the third resistor, and the ground end of the first operational amplifier is grounded. The first end of the fourth resistor is connected to the positive electrode of the second energy storage module, and the second end of the fourth resistor is connected to the second input end of the first operational amplifier. The control end of the first controlled switch is connected to the output end of the first operational amplifier, and the first end of the first controlled switch is connected to the second end of the fourth resistor; the second end of the first controlled switch serves as the output end of the first voltage divider circuit.

[0056] In another optional manner of the above embodiment, the first voltage divider circuit may include: a first operational amplifier, a fourth resistor and a first controlled switch. The first input terminal of the first operational amplifier is connected to the positive electrode of the first energy storage module, and the ground terminal of the first operational amplifier is grounded. The first end of the fourth resistor is connected to the positive electrode of the second energy storage module, and the second end of the fourth resistor is connected to the second input terminal of the first operational amplifier. The control end of the first controlled switch is connected to the output end of the first operational amplifier, and the first end of the first controlled switch is connected to the second end of the fourth resistor; the second end of the first controlled switch serves as the output end of the first voltage divider circuit.

[0057] In the above embodiment, the first controlled switch can be a component in the prior art that is controlled to be turned on and off, such as: MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, triode, optocoupler, thyristor, etc., which is not limited here.

[0058] In the above optional manner, the ground terminal of the first operational amplifier may be grounded through an eleventh resistor.

[0059] In an optional manner of the above embodiment, the first detection circuit includes: a fifth resistor, a sixth resistor, a first trimming resistor and a third selector. The first end of the fifth resistor is connected to the output end of the first voltage divider circuit. The first end of the sixth resistor is connected to the second end of the fifth resistor. The first end of the first trimming resistor is connected to the second end of the sixth resistor, and the second end of the first trimming resistor is grounded. The first input end of the third selector is connected to the second end of the fifth resistor; the second input end of the third selector is suspended; the selection end of the third selector is used to receive a third preset signal; and the output end of the third selector is connected to the signal comparison end.

[0060] In another optional manner of the above embodiment, the first detection circuit includes: a sixth resistor, a first trimming resistor and a third selector. The first end of the sixth resistor is connected to the output end of the first voltage divider circuit. The first end of the first trimming resistor is connected to the second end of the sixth resistor, and the second end of the first trimming resistor is grounded. The first input end of the third selector is connected to the first end of the sixth resistor; the second input end of the third selector is suspended; the selection end of the third selector is used to receive a third preset signal; and the output end of the third selector is connected to the signal comparison end.

[0061] In another optional manner of the above embodiment, the first detection circuit includes: a fifth resistor, a sixth resistor and a third selector. The first end of the fifth resistor is connected to the output end of the first voltage divider circuit. The first end of the sixth resistor is connected to the second end of the fifth resistor. The second end of the sixth resistor is grounded. The first input end of the third selector is connected to the second end of the fifth resistor; the second input end of the third selector is suspended; the selection end of the third selector is used to receive a third preset signal; and the output end of the third selector is connected to the signal comparison end.

[0062] Exemplarily, it is assumed that the over-voltage and under-voltage comparison circuit includes: a first selector and a comparator. The first energy storage detection circuit includes: a first resistor, a second resistor and a second selector. The first voltage divider circuit includes: a third resistor, a first operational amplifier, a fourth resistor and a first controlled switch. The first detection circuit includes: a fifth resistor, a sixth resistor, a first trimming resistor and a third selector. Figure 2As shown, the first input end of the first selector 6 is used to receive the overvoltage threshold signal (ov_ref), the second input end of the first selector 6 is used to receive the undervoltage threshold signal (uv_ref), and the selection end of the first selector 6 is used to receive the first preset signal (D2). The first input end of the comparator 7 is connected to the output end of the first selector 6. Among them, the second input end of the comparator 7 is the signal comparison end. The positive electrode (VC1) of the first energy storage module is connected to the first end of the first resistor 9 and the first end of the third resistor 11. The second end of the first resistor 9 is connected to the first end of the second resistor 10 and the first input end of the second selector 8. The second end of the second resistor 10 is grounded. The second input end of the second selector 8 is suspended, the selection end of the second selector 8 is used to receive the second preset signal (D1), and the output end of the second selector 8 is connected to the signal comparison end. The first input end of the first operational amplifier 12 is connected to the second end of the third resistor 11, and the ground end of the first operational amplifier 12 is grounded through the eleventh resistor 19. The positive electrode (VC2) of the second energy storage module is connected to the first end of the fourth resistor 13, and the second end of the fourth resistor 13 is connected to the second input end of the first operational amplifier 12. The output end of the first operational amplifier 12 is connected to the gate of the first PMOS tube 14, and the source of the first PMOS tube 14 is connected to the second end of the fourth resistor 13; the drain of the first PMOS tube 14 is connected to the first end of the fifth resistor 15. The second end of the fifth resistor 15 is connected to the first end of the sixth resistor 16 and the first input end of the third selector 18. The second end of the sixth resistor 16 is connected to the first end of the first trimming resistor 17. The second end of the first trimming resistor 17 is grounded. The second input end of the third selector 18 is suspended, the selection end of the third selector 18 is used to receive the third preset signal (D1_N), and the output end of the third selector 18 is connected to the signal comparison end.

[0063] In some embodiments, the over- and under-voltage detection circuit may further include: a third energy storage detection circuit, which is connected to the over- and under-voltage comparison circuit and the second energy storage detection circuit, and is also configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the third energy storage module; the third energy storage detection circuit is used to receive a fourth preset signal and a fifth preset signal, and input the second voltage or the third voltage of the third energy storage module to the signal comparison terminal according to the fourth preset signal and the fifth preset signal.

[0064] In an optional manner of the above embodiment, the third energy storage detection circuit may include: a second voltage divider circuit and a selection detection circuit. The second voltage divider circuit is configured to be connected to the positive electrode of the third energy storage module and the positive electrode of the second energy storage module; the second voltage divider circuit is used to divide the voltage output by the positive electrode of the third energy storage module, and output the third voltage through the output end of the second voltage divider circuit. The selection detection circuit is connected to the output end of the second voltage divider circuit, the over-voltage and under-voltage comparison circuit, and the second energy storage detection circuit, and the selection detection circuit is used to receive the fourth preset signal and the fifth preset signal, and input the third voltage or the second voltage to the signal comparison end according to the fourth preset signal and the fifth preset signal.

[0065] In the above optional manner, the second voltage divider circuit may include: a seventh resistor, a second operational amplifier, a second controlled switch, an eighth resistor and a third controlled switch. Among them, the first end of the seventh resistor is connected to the positive electrode of the second energy storage module. The first input terminal of the second operational amplifier is connected to the second end of the seventh resistor. The first end of the second controlled switch is connected to the ground terminal of the second operational amplifier, and the control terminal of the second controlled switch is connected to the second energy storage detection circuit; the second end of the second controlled switch is grounded. The first end of the eighth resistor is connected to the positive electrode of the third energy storage module, and the second end of the eighth resistor is connected to the second input terminal of the second operational amplifier. The control terminal of the third controlled switch is connected to the output terminal of the second operational amplifier, and the first end of the third controlled switch is connected to the second end of the eighth resistor; the second end of the third controlled switch serves as the output terminal of the second voltage divider circuit. In this way, combined with Figure 3 As shown, Figure 3 Figure 1 is a schematic diagram of the connection relationship of the energy storage module. Figure 3 , three energy storage modules are connected in series, where VC1 is the positive electrode of the first energy storage module, VC2 is the positive electrode of the second energy storage module, and VC3 is the positive electrode of the third energy storage module. That is, the voltage output by VC3 is actually the sum of the voltages of the first energy storage module, the second energy storage module, and the third energy storage module, and the second voltage divider circuit is required to make the voltage output at the output end of the second voltage divider circuit the voltage of the third energy storage module.

[0066] In the above optional manner, the second end of the second controlled switch is grounded through a twelfth resistor.

[0067] In the above embodiment, the second controlled switch can be a component in the prior art that is controlled to be turned on and off, such as: MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide semiconductor field effect transistor) tube, triode, relay, optocoupler, thyristor, etc., which is not limited here.

[0068] In the above embodiment, the third controlled switch can be a component in the prior art that is controlled to be turned on and off, such as: MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, triode, relay, optocoupler, thyristor, etc., which is not limited here.

[0069] In the above optional manner, the selection detection circuit may include: a tenth resistor, a second trimming resistor, a fourth selector and a fifth selector. Among them, the first end of the tenth resistor is connected to the output end of the second voltage divider circuit. The first end of the second trimming resistor is connected to the second end of the tenth resistor, and the second end of the second trimming resistor is grounded. The first input end of the fourth selector is connected to the first end of the tenth resistor; the selection end of the fourth selector is used to receive the fifth preset signal; the output end of the fourth selector is connected to the signal comparison end of the over-voltage and under-voltage comparison circuit. The output end of the fifth selector is connected to the second input end of the fourth selector; the first input end of the fifth selector is connected to the second energy storage detection circuit; the second input end of the fifth selector is suspended, and the selection end of the fifth selector is used to receive the fourth preset signal.

[0070] In the above optional manner, the selection detection circuit may include: a ninth resistor, a tenth resistor, a second trimming resistor, a fourth selector and a fifth selector. Among them, the first end of the ninth resistor is connected to the output end of the second voltage divider circuit. The first end of the tenth resistor is connected to the second end of the ninth resistor. The first end of the second trimming resistor is connected to the second end of the tenth resistor, and the second end of the second trimming resistor is grounded. The first input end of the fourth selector is connected to the second end of the ninth resistor; the selection end of the fourth selector is used to receive the fifth preset signal; the output end of the fourth selector is connected to the signal comparison end of the over-undervoltage comparison circuit. The output end of the fifth selector is connected to the second input end of the fourth selector; the first input end of the fifth selector is connected to the second energy storage detection circuit; the second input end of the fifth selector is suspended, and the selection end of the fifth selector is used to receive the fourth preset signal.

[0071] Exemplarily, the over-voltage and under-voltage comparison circuit includes: a first selector and a comparator. The first energy storage detection circuit includes: a first resistor, a second resistor, and a second selector. The first voltage divider circuit includes: a third resistor, a first operational amplifier, a fourth resistor, and a first controlled switch. The first controlled switch is a first PMOS tube. The first detection circuit includes: a fifth resistor, a sixth resistor, a first adjustment resistor, and a third selector. The second voltage divider circuit includes: a seventh resistor, a second operational amplifier, a second controlled switch, an eighth resistor, and a third controlled switch. The second controlled switch is a second PMOS tube. The third controlled switch is a third PMOS tube. The selection detection circuit includes: a ninth resistor, a tenth resistor, a second adjustment resistor, a fourth selector, and a fifth selector. Combined with Figure 4As shown, the first input end of the first selector 6 is used to receive the overvoltage threshold signal (ov_ref), the second input end of the first selector 6 is used to receive the undervoltage threshold signal (uv_ref), and the selection end of the first selector 6 is used to receive the first preset signal (D3). The first input end of the comparator 7 is connected to the output end of the first selector 6. Among them, the second input end of the comparator 7 is the signal comparison end. The positive electrode of the first energy storage module is connected to the first end of the first resistor 9 and the first end of the third resistor 11. The second end of the first resistor 9 is connected to the first end of the second resistor 10 and the first input end of the second selector 8. The second end of the second resistor 10 is grounded. The second input end of the second selector 8 is suspended, the selection end of the second selector 8 is used to receive the second preset signal (con_1), and the output end of the second selector 8 is connected to the signal comparison end. The first input end of the first operational amplifier 12 is connected to the second end of the third resistor 11, and the ground end of the first operational amplifier 12 is grounded through the eleventh resistor 19. The positive electrode of the second energy storage module is connected to the first end of the fourth resistor 13 and the first end of the seventh resistor 22. The second end of the fourth resistor 13 is connected to the second input end of the first operational amplifier 12. The output end of the first operational amplifier 12 is connected to the gate of the first PMOS tube 14, and the source of the first PMOS tube 14 is connected to the second end of the fourth resistor 13; the drain of the first PMOS tube 14 is connected to the first end of the fifth resistor 15. The second end of the fifth resistor 15 is connected to the first end of the sixth resistor 16 and the first input end of the third selector 18. The second end of the sixth resistor 16 is connected to the first end of the first trimming resistor 17. The second end of the first trimming resistor 17 is grounded. The second input end of the third selector 18 is suspended, the selection end of the third selector 18 is used to receive the third preset signal (con_2), and the output end of the third selector 18 is connected to the signal comparison end. The second end of the seventh resistor 22 is connected to the first input end of the second operational amplifier 20. The ground end of the second operational amplifier 20 is connected to the source of the second PMOS tube 23, the gate of the second PMOS tube 23 is connected to the output end of the first operational amplifier 12, and the drain of the second PMOS tube 23 is grounded through the twelfth resistor 31. The second input terminal of the second operational amplifier 20 is connected to the second terminal of the eighth resistor 21 and the source of the third PMOS tube 24. The output terminal of the second operational amplifier 20 is connected to the gate of the third PMOS tube 24. The first terminal of the eighth resistor 21 is connected to the positive electrode of the third energy storage module. The drain of the third PMOS tube 24 is connected to the first terminal of the ninth resistor 25. The second terminal of the ninth resistor 25 is connected to the first terminal of the tenth resistor 26 and the first input terminal of the fourth selector 29. The second terminal of the tenth resistor 26 is connected to the first terminal of the second trimming resistor 27. The second terminal of the second trimming resistor 27 is grounded. The selection terminal of the fourth selector 29 is connected to the output terminal of the first AND gate 28, and the second input terminal of the fourth selector 29 is connected to the output terminal of the fifth selector 30.The first input terminal of the first AND gate 28 is used to receive the fourth preset signal (con_3), and the second input terminal of the first AND gate 28 is used to receive the sixth preset signal (en_3). The first input terminal of the fifth selector 30 is connected to the second terminal of the fifth resistor 15, and the second input terminal of the fifth selector 30 is suspended. The selection terminal of the fifth selector 30 is used to receive the fourth preset signal (con_3).

[0072] It can be understood that the resistance values ​​of each resistor in the over-voltage and under-voltage detection circuit can be determined by engineers based on experience. For example, if the voltage of the first energy storage module is 3.6V (volts) and the power consumption is required to be 200nA (nanoamperes), the sum of the resistance values ​​of the first resistor and the second resistor is required to be 18MΩ (megaohms). The resistance value of the fourth resistor is equal to the sum of the resistance values ​​of the first resistor and the second resistor. The resistance value of the eighth resistor is equal to the sum of the resistance values ​​of the first resistor and the second resistor. In this way, because of the clamping effect of the operational amplifier, the voltage difference from the positive electrode of the second energy storage module to the second input terminal of the first operational amplifier is equal to the positive voltage of the first energy storage module, and the voltage difference from the positive electrode of the third energy storage module to the second input terminal of the second operational amplifier is also equal to the positive voltage of the first energy storage module, so the current flowing through the fourth resistor and the eighth resistor is equal to the current flowing through the branch where the first resistor is located. The value of the sixth resistor and the first trimming resistor is equal to the resistance value of the second resistor, ensuring that the voltage dividing point effect of the second energy storage module is the same as the voltage dividing point effect of the first energy storage module. Similarly, the resistance of the tenth resistor plus the second trimming resistor is equal to the resistance of the second resistor, ensuring that the voltage divider effect of the third battery is the same as that of the first battery. The fifth and ninth resistors are reserved for future modification. The functions of the eleventh, twelfth, third and seventh resistors are to prevent ESD (Electro-Static discharge) and current limiting, and appropriate values ​​can be used.

[0073] It is worth noting that the first preset signal (D3) in the above content refers to the use of the pulse waveform corresponding to D3 as the first preset signal. Similarly, this interpretation is also applicable to other signals in the above text, such as: overvoltage threshold signal (ov_ref), undervoltage threshold signal (uv_ref), first preset signal (D2), second preset signal (D1), third preset signal (D1_N), second preset signal (con_1), third preset signal (con_2), fourth preset signal (con_3), sixth preset signal (en_3) and fourth preset signal (con_3), etc.

[0074] In some embodiments, the over-voltage and under-voltage detection circuit further includes: a signal output module, configured to generate a first preset signal, a second preset signal, a third preset signal, and a fourth preset signal.

[0075] In an optional manner of the above embodiment, in combination with Figure 5As shown, the signal output module includes: an oscillator 32, a first D flip-flop 33, a second D flip-flop 34, a third D flip-flop 35, a fourth D flip-flop 36, a second AND gate 37, a third AND gate 38, a fourth AND gate 39, a fifth AND gate 40 and an OR gate 41. The output end of the oscillator 32 is connected to the clock control end of the first D flip-flop 33, the second output end of the first D flip-flop 33 is connected to the data input end of the first D flip-flop 33, the enable end of the first D flip-flop 33 is configured to receive an enable signal, and the first output end of the first D flip-flop 33 is connected to the clock control end of the second D flip-flop 34. The second output end of the second D flip-flop 34 is connected to the data input end of the second D flip-flop 34, the enable end of the second D flip-flop 34 is configured to receive an enable signal, and the first output end of the second D flip-flop 34 is connected to the clock control end of the third D flip-flop 35. The second output terminal of the third D flip-flop 35 is connected to the data input terminal of the third D flip-flop 35, the enable terminal of the third D flip-flop 35 is configured to receive an enable signal, and the first output terminal of the third D flip-flop 35 is connected to the clock control terminal of the fourth D flip-flop 36. The second output terminal of the fourth D flip-flop 36 is connected to the data input terminal of the fourth D flip-flop 36, and the enable terminal of the fourth D flip-flop 36 is configured to receive an enable signal. The connection point between the second D flip-flop 34 and the third D flip-flop 35 is connected to the first input terminal of the second AND gate 37 and the first input terminal of the fourth AND gate, and the connection point between the third D flip-flop 35 and the fourth D flip-flop 36 is connected to the second input terminal of the second AND gate 37 and the second input terminal of the third AND gate 38. The second output terminal of the second D flip-flop 34 is connected to the first input terminal of the second AND gate 37 and the first input terminal of the fifth AND gate 40. The second output terminal of the third D flip-flop 35 is connected to the second input terminal of the fourth AND gate 39. The second output terminal of the fourth D flip-flop 36 is connected to the second input terminal of the fifth AND gate 40. The output end of the fourth AND gate 39 is connected to the first input end of the first OR gate 41, and the output end of the fifth AND gate 40 is connected to the second input end of the first OR gate 41. Among them, the output end of the second AND gate 37 outputs the second preset signal, the output end of the third AND gate 38 outputs the third preset signal, and the output end of the first OR gate 41 outputs the fourth preset signal. The output end of the fourth D flip-flop 36 outputs the first preset signal. In this way, since the D flip-flop provides a two-frequency division function for the oscillator, the signal frequency of the first D flip-flop, the second D flip-flop, the third D flip-flop and the fourth D flip-flop is reduced by half, and the period is increased by multiples. Combined with the second AND gate, the third AND gate, the fourth AND gate, the fifth AND gate and the OR gate, when the first output end of the second D flip-flop and the first output end of the third D flip-flop are both high level, the second preset signal is high.Similarly, when the second output terminal of the second D flip-flop and the first output terminal of the third D flip-flop are both high levels, the third preset signal is high; when the first output terminal of the second D flip-flop and the second output terminal of the third D flip-flop are both high levels or the second output terminal of the second D flip-flop and the second output terminal of the fourth D flip-flop are both high levels, the fourth preset signal is high.

[0076] In another optional manner of the above embodiment, four oscillators may be provided, each of which outputs a preset signal. For example, oscillator A, oscillator B, oscillator C, and oscillator D are provided. Oscillator A outputs a first preset signal, oscillator B outputs a second preset signal, oscillator C outputs a third preset signal, and oscillator D outputs a fourth preset signal.

[0077] For example, Figure 6 It is a schematic diagram of the simulation waveform of part of the output signal. It can be seen from the timing diagram that the duration of the high level of D1 plus the duration of the high level of D1_N is equal to the duration of the high level of D2. It can be understood that Figure 6 The signal in can be applied to Figure 2 In the circuit shown.

[0078] For example, Figure 7 Figure 1 is a schematic diagram of the simulation waveform of some output signals. Figure 7 As shown, net103 is the overvoltage threshold signal, net109 is the undervoltage threshold signal, net115 is the signal output from the output end of the first selector, net9 is the signal output from the output end of the comparator, and vsence is the signal input to the signal comparison end. con_1 is the second preset signal, con_2 is the third preset signal, con_3 is the fourth preset signal, and D3 is the first preset signal. It can be seen from the timing diagram that when net9 is low level, it enters the overvoltage detection; when net9 is high, it enters the undervoltage detection. It can be understood that Figure 7 The signal in can be applied to Figure 4In the circuit shown. When there are three strings of batteries and the sixth preset signal is at a high level, when the fourth preset signal and the sixth preset signal received by the first AND gate are both at a high level, the selection end of the fourth selector receives a high level, and the voltage representing the third energy storage module is selected to be compared in the comparator. When there are only two strings of batteries, there is no voltage representing the third energy storage module at this time, and the sixth preset signal can be changed to a low level, so that the selection end of the fourth selector receives a low level, and the output of the fifth selector is selected to the comparator. When the fourth preset signal is high, the voltage representing the second energy storage module is the output of the fifth selector. That is, by changing the sixth preset signal, the signal input to the comparator when the fourth preset signal is at a high level can be changed to represent the voltage of the third energy storage module or the voltage of the second energy storage module. It avoids the situation where there is no voltage sampling when the fourth preset signal is high when there are only two strings of batteries. As a result, the circuit of the present application can not only perform over-voltage and under-voltage judgment on three series-connected batteries, but also perform over-voltage and under-voltage judgment on two series-connected batteries.

[0079] It is worth noting that engineers can adjust the pulse waveforms corresponding to the first preset signal, the second preset signal, the third preset signal, the fourth preset signal and the sixth preset signal according to the actual use requirements of the circuit. Figure 2 The circuit and Figure 4 The circuit in the circuit is different, so in actual use, Figure 2 The circuit and Figure 4 The circuits in FIG. 1 and 1 have different pulse waveforms used in the preset signals.

[0080] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An over-voltage and under-voltage detection circuit, characterized in that: include: An overvoltage / undervoltage comparison circuit, the overvoltage / undervoltage comparison circuit is used to receive an overvoltage threshold signal, an undervoltage threshold signal and a first preset signal, and compare the overvoltage threshold signal or the undervoltage threshold signal with an input signal according to the first preset signal; the input signal is a signal input to a signal comparison terminal of the overvoltage / undervoltage comparison circuit; a first energy storage detection circuit, the first energy storage detection circuit being connected to the over-voltage and under-voltage comparison circuit and being further configured to be connected to the positive electrode of the first energy storage module; the first energy storage detection circuit being used to receive a second preset signal and input the first voltage of the first energy storage module into the signal comparison terminal according to the second preset signal; a second energy storage detection circuit, the second energy storage detection circuit being connected to the over-voltage and under-voltage comparison circuit, and being further configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the first energy storage module; the second energy storage detection circuit being used to receive a third preset signal, and inputting the second voltage of the second energy storage module into the signal comparison terminal according to the third preset signal; Wherein, the over-voltage and under-voltage comparison circuit comprises: A first selector, wherein the first input end of the first selector is used to receive the overvoltage threshold signal; the second input end of the first selector is used to receive the undervoltage threshold signal; and the selection end of the first selector is used to receive the first preset signal; A comparator, wherein a first input terminal of the comparator is connected to an output terminal of the first selector; a second input terminal of the comparator is the signal comparison terminal; and an output terminal of the comparator is used to output an overvoltage and undervoltage comparison result; The first energy storage detection circuit comprises: a first resistor, wherein a first end of the first resistor is connected to a positive electrode of the first energy storage module; a second resistor, a first end of the second resistor being connected to a second end of the first resistor, and a second end of the second resistor being grounded; a second selector, wherein a first input terminal of the second selector is connected to a second terminal of the first resistor; a second input terminal of the second selector is suspended; a selection terminal of the second selector is used to receive a second preset signal; and an output terminal of the second selector is connected to the signal comparison terminal; The second energy storage detection circuit comprises: a first voltage-dividing circuit, the first voltage-dividing circuit being configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the first energy storage module; the first voltage-dividing circuit is used to divide the voltage output by the positive electrode of the second energy storage module, and output the second voltage of the second energy storage module through the output end of the first voltage-dividing circuit; a first detection circuit, the first detection circuit being connected to the output end of the first voltage divider circuit and the over-voltage / under-voltage comparison circuit, the first detection circuit being used to receive the third preset signal and input the second voltage into the signal comparison end according to the third preset signal; The first voltage divider circuit comprises: A first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to a positive electrode of the first energy storage module, and a ground terminal of the first operational amplifier is grounded; a fourth resistor, wherein a first end of the fourth resistor is connected to the positive electrode of the second energy storage module, and a second end of the fourth resistor is connected to the second input end of the first operational amplifier; a first controlled switch, wherein a control end of the first controlled switch is connected to the output end of the first operational amplifier, a first end of the first controlled switch is connected to the second end of the fourth resistor; and a second end of the first controlled switch serves as an output end of the first voltage divider circuit; The first detection circuit comprises: a sixth resistor, wherein a first end of the sixth resistor is connected to the output end of the first voltage divider circuit; a first trimming resistor, wherein a first end of the first trimming resistor is connected to a second end of the sixth resistor, and a second end of the first trimming resistor is grounded; A third selector, wherein the first input terminal of the third selector is connected to the first end of the sixth resistor; the second input terminal of the third selector is suspended; the selection terminal of the third selector is used to receive a third preset signal; and the output terminal of the third selector is connected to the signal comparison terminal.

2. The over-voltage and under-voltage detection circuit according to claim 1, characterized in that: The first voltage divider circuit further includes: A third resistor, the first input terminal of the first operational amplifier is connected to the positive electrode of the first energy storage module through the third resistor.

3. The over-voltage and under-voltage detection circuit according to claim 1, characterized in that: The first detection circuit further includes: A fifth resistor, wherein a first end of the sixth resistor is connected to an output end of the first voltage divider circuit through the fifth resistor.

4. The over-voltage and under-voltage detection circuit according to any one of claims 1 to 3, characterized in that: The over-voltage and under-voltage detection circuit further includes: a third energy storage detection circuit, wherein the third energy storage detection circuit is connected to the over-voltage and under-voltage comparison circuit and the second energy storage detection circuit, and is also configured to be connected to the positive electrode of the second energy storage module and the positive electrode of the third energy storage module; the third energy storage detection circuit is used to receive a fourth preset signal and a fifth preset signal, and input the second voltage or the third voltage of the third energy storage module into the signal comparison terminal according to the fourth preset signal and the fifth preset signal.

5. The over-voltage and under-voltage detection circuit according to claim 4, characterized in that: The third energy storage detection circuit comprises: a second voltage-dividing circuit, the second voltage-dividing circuit being configured to be connected to the positive electrode of the third energy storage module and the positive electrode of the second energy storage module; the second voltage-dividing circuit is used to divide the voltage output by the positive electrode of the third energy storage module, and output the third voltage through the output end of the second voltage-dividing circuit; A detection circuit is selected, and the detection circuit is connected to the output end of the second voltage divider circuit, the over-voltage and under-voltage comparison circuit, and the second energy storage detection circuit. The detection circuit is used to receive the fourth preset signal and the fifth preset signal, and input the third voltage or the second voltage into the signal comparison end according to the fourth preset signal and the fifth preset signal.

6. The over-voltage and under-voltage detection circuit according to claim 5, characterized in that: The second voltage divider circuit comprises: a seventh resistor, a first end of the seventh resistor being connected to the positive electrode of the second energy storage module; a second operational amplifier, wherein a first input terminal of the second operational amplifier is connected to a second terminal of the seventh resistor; a second controlled switch, wherein a first end of the second controlled switch is connected to a ground end of the second operational amplifier, a control end of the second controlled switch is connected to the second energy storage detection circuit; and a second end of the second controlled switch is grounded; an eighth resistor, wherein a first end of the eighth resistor is connected to the positive electrode of the third energy storage module, and a second end of the eighth resistor is connected to the second input end of the second operational amplifier; a third controlled switch, wherein the control end of the third controlled switch is connected to the output end of the second operational amplifier, the first end of the third controlled switch is connected to the second end of the eighth resistor; and the second end of the third controlled switch serves as the output end of the second voltage divider circuit.

7. The over-voltage and under-voltage detection circuit according to claim 5, characterized in that: The selection detection circuit comprises: a ninth resistor, wherein a first end of the ninth resistor is connected to the output end of the second voltage divider circuit; a tenth resistor, a first end of the tenth resistor being connected to a second end of the ninth resistor; a second trimming resistor, wherein a first end of the second trimming resistor is connected to a second end of the tenth resistor, and a second end of the second trimming resistor is grounded; a fourth selector, wherein a first input terminal of the fourth selector is connected to the second terminal of the ninth resistor; a selection terminal of the fourth selector is used to receive the fifth preset signal; and an output terminal of the fourth selector is connected to a signal comparison terminal of the over-voltage and under-voltage comparison circuit; A fifth selector, wherein the output end of the fifth selector is connected to the second input end of the fourth selector; the first input end of the fifth selector is connected to the second energy storage detection circuit; the second input end of the fifth selector is suspended, and the selection end of the fifth selector is used to receive the fourth preset signal.

8. The over-voltage and under-voltage detection circuit according to claim 7, characterized in that: The selection detection circuit further includes: A first AND gate, wherein the first input end of the first AND gate is used to receive the fourth preset signal, and the second input end of the first AND gate is used to receive the sixth preset signal; the output end of the first AND gate is connected to the selection end of the fourth selector; the signal output by the output end of the first AND gate is the fifth preset signal.

9. The over-voltage and under-voltage detection circuit according to claim 4, characterized in that: The over-voltage and under-voltage detection circuit further includes: The signal output module is used to generate the first preset signal, the second preset signal, the third preset signal and the fourth preset signal.

10. A power management device, characterized in that: The invention comprises the over-voltage and under-voltage detection circuit as claimed in any one of claims 1 to 9.

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