Single-wire communication circuit and electric equipment

Abstract

The utility model relates to the technical field of single-wire communication, and discloses a single-wire communication circuit and electric equipment. The single-line communication circuit comprises a signal emission interface and an external communication interface, an emission unit circuit used for mapping signals of the signal emission interface to the external communication interface is electrically connected between the signal emission interface and the external communication interface, and the emission unit circuit comprises a switch tube QC4. And a high-voltage protection unit circuit is electrically connected between the control end of the switch tube QC4 and the positive terminal of the switch tube QC4. According to the utility model, the high-voltage protection unit circuit is additionally arranged in the single-wire communication circuit, when external high voltage is accessed, components of single-wire communication can be effectively protected, the risk of damage to the components is reduced, and the circuit does not need to adopt a high-voltage-resistant switch tube or diode, so that the cost is low, and the high-voltage protection response time is short.

Description

Technical Field

[0001] The utility model relates to the technical field of single - wire communication, in particular to a single - wire communication circuit and an electrical equipment. Background Art

[0002] With life increasingly tending towards green energy, in daily travel, electric vehicles are rapidly emerging due to their advantages of convenience, environmental protection, and energy conservation; and as the power source of electric vehicles, the stability, reliability, and safety of batteries are particularly important. At present, most of the communication methods of lithium batteries adopt single - wire communication, so the interface protection for this single - wire communication is particularly important. Because once this interface fails, the electric vehicle cannot normally display the battery power, the user cannot know the current battery power, cannot accurately judge the cruising range of the electric vehicle, and cannot charge the battery in time during use, resulting in a poor user experience. Once the electric vehicle suddenly loses power during riding due to battery depletion, it may also pose a safety hazard to the user.

[0003] In the prior art, for example, the patent application number is "CN202321732102.3", and the name is "A single - wire communication circuit". This single - wire communication circuit prevents external high voltage from being transmitted to the signal transmitting end or the signal receiving end, enhancing the safety protection ability of single - wire communication; according to its circuit structure, this single - wire communication circuit needs to use high - voltage - resistant triodes Q1, triode Q3, and diode D1 to protect against high - voltage impact, with a relatively high circuit cost. Moreover, due to the limitations in component material selection (the material selection of components generally needs to correspond to different high - voltage environments, and the high - voltage resistance of components also has a design limit), this circuit structure does not have universality.

[0004] In view of this, how to effectively protect the components of the single - wire communication circuit and reduce the use cost of the circuit on the premise of realizing the functions of the single - wire communication circuit has become an urgent technical problem for those skilled in the art.

[0005] The above information is given as background information only to assist in understanding the present disclosure, and it is not determined or admitted whether any of the above content can be used as prior art relative to the present disclosure. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a single - wire communication circuit and an electrical equipment to solve or at least partially solve the technical problems existing in the prior art.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] In a first aspect, the present utility model provides a single - wire communication circuit, which includes a signal transmitting interface and an external communication interface. An emitting unit circuit for mapping the signal of the signal transmitting interface to the external communication interface is electrically connected between the signal transmitting interface and the external communication interface;

[0009] The emitting unit circuit includes a switching transistor QC3 and a switching transistor QC4. The positive connection terminal of the switching transistor QC3 is electrically connected to the working power supply VCC +. The control terminal of the switching transistor QC3 is electrically connected to the signal transmitting interface. The negative connection terminal of the switching transistor QC3 is electrically connected to the control terminal of the switching transistor QC4. The positive connection terminal of the switching transistor QC4 is electrically connected to the external communication interface. The negative connection terminal of the switching transistor QC4 is electrically connected to the first reference ground. Among them, when the signal transmitting interface receives a low - level signal, the switching transistor QC3 conducts, and the switching transistor QC4 conducts;

[0010] A high - voltage protection unit circuit is also electrically connected between the control terminal of the switching transistor QC4 and the positive connection terminal of the switching transistor QC4;

[0011] The high - voltage protection unit circuit includes a switching transistor Q1. The negative connection terminal of the switching transistor Q1 is electrically connected to the first reference ground. The positive connection terminal of the switching transistor Q1 is electrically connected to the control terminal of the switching transistor QC4. A resistor R2 is also electrically connected between the control terminal of the switching transistor Q1 and the negative connection terminal of the switching transistor Q1. A voltage - dividing resistor is also electrically connected between the control terminal of the switching transistor Q1 and the positive connection terminal of the switching transistor QC4;

[0012] When an external high voltage is connected to the external communication interface, the positive connection terminal and the negative connection terminal of the switching transistor Q1 conduct, pulling the control terminal of the switching transistor QC4 to a low level, and the switching transistor QC4 is turned off or non - conductive.

[0013] Optionally, the voltage - dividing resistor includes a series - connected resistor R3 and resistor R4;

[0014] The first end of the resistor R3 is electrically connected to the control terminal of the switching transistor Q1. The second end of the resistor R3 is electrically connected to the first end of the resistor R4. The second end of the resistor R4 is electrically connected to the negative electrode of the diode D1. The positive electrode of the diode D1 is electrically connected to the positive connection terminal of the switching transistor QC4.

[0015] Optionally, the external communication interface is electrically connected to the controller power supply through a pull - up resistor R5;

[0016] A fuse F1 is also electrically connected between the positive electrode of the diode D1 and the external communication interface.

[0017] Optionally, the single - wire communication circuit further includes a signal receiving interface. A receiving unit circuit for mapping the signal of the external communication interface to the signal receiving interface is electrically connected between the signal receiving interface and the external communication interface;

[0018] The receiving unit circuit includes a switching transistor QC1 and a switching transistor QC2. There is a resistor R6 electrically connected between the control terminal of the switching transistor QC2 and the positive connection terminal of the switching transistor QC4. The negative connection terminal of the switching transistor QC2 is electrically connected to the first reference ground. The positive connection terminal of the switching transistor QC2 is electrically connected to the control terminal of the switching transistor QC1. The positive connection terminal of the switching transistor QC1 is electrically connected to the working power supply VCC+. The control terminal of the switching transistor QC1 is also electrically connected to the working power supply VCC+ through a resistor RC1. The negative connection terminal of the switching transistor QC1 is electrically connected to the first end of a resistor R1, and the second end of the resistor R1 is electrically connected to the signal receiving interface.

[0019] Optionally, the first end of the resistor R6 is also electrically connected to the negative electrode of a diode D2, and the positive electrode of the diode D2 is electrically connected to the positive connection terminal of the switching transistor QC4;

[0020] The second end of the resistor R6 is also electrically connected to the first end of a resistor RC6, and the second end of the resistor RC6 is electrically connected to the first reference ground;

[0021] There is also a diode DC1 provided between the control terminal of the switching transistor QC1 and the positive connection terminal of the switching transistor QC2. The negative electrode of the diode DC1 is electrically connected to the positive connection terminal of the switching transistor QC2, and a resistor RC2 is electrically connected between the positive electrode of the diode DC1 and the control terminal of the switching transistor QC1;

[0022] The first end of the resistor R1 is also electrically connected to the first end of a resistor RC3, and the second end of the resistor RC3 is electrically connected to the second reference ground.

[0023] Optionally, the transmitting unit circuit further includes a resistor RC4, a resistor RC5, a resistor RC7, a resistor RC8, and a diode DC3;

[0024] The first end of the resistor RC5 is electrically connected to the signal transmitting interface. The first end of the resistor RC4 is electrically connected to the working power supply VCC+. The second end of the resistor RC5 is electrically connected to the second end of the resistor RC4 and the control terminal of the switching transistor QC3 respectively. The negative connection terminal of the switching transistor QC3 is electrically connected to the positive electrode of the diode DC3. The negative electrode of the diode DC3 is electrically connected to the first end of the resistor RC7. The second end of the resistor RC7 is electrically connected to the first end of the resistor RC8 and the control terminal of the switching transistor QC4 respectively. The second end of the resistor RC8 is electrically connected to the first reference ground.

[0025] Optionally, the switching transistors QC1 and QC3 are PNP triodes, the switching transistors QC2 and QC4 are NPN triodes; the switching transistor Q1 is an NPN triode.

[0026] In a second aspect, the present invention further provides an electrical device, including a battery provided with an external communication interface, and further including a single-wire communication circuit as described above.

[0027] Optionally, the electrical device is an electric vehicle.

[0028] Compared with the prior art, the present utility model has the following beneficial effects:

[0029] By adding a high-voltage protection unit circuit to the single-wire communication circuit, the present utility model can effectively protect the components of the single-wire communication when external high voltage is connected, reduce the risk of component damage, and moreover, this circuit does not need to use high-voltage-resistant switching tubes or diodes, has low cost, and has a fast response time for high-voltage protection.

[0030] The present utility model has other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent specific embodiments, or will be described in detail in the accompanying drawings incorporated herein and the subsequent specific embodiments, and these accompanying drawings and specific embodiments are jointly used to explain the specific principles of the present utility model. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model, and for those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0032] Figure 1 It is a structural schematic diagram of a single-wire communication circuit provided by an embodiment of the present utility model. Detailed Embodiments

[0033] To describe in detail the possible application scenarios, technical principles, specific implementable solutions, achievable purposes and effects, etc. of the present application, the following will be described in detail in conjunction with the listed specific embodiments and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0034] Referring to "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0035] Unless otherwise defined, the meanings of technical terms used herein are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0036] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " herein generally represents an "or" logical relationship between the associated objects before and after.

[0037] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary, or sequential relationships between these entities or operations.

[0038] Without further limitations, in this application, the expressions "include", "comprise", "have", or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method, or product that includes the said elements. Thus, a process, method, or product that includes a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method, or product.

[0039] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the number itself; expressions such as "above", "below", "within", etc. are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "multiple" is two or more (including two), and similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in the same way, unless otherwise specifically defined.

[0040] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing. It is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, and does not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of this application.

[0041] Unless otherwise clearly specified or defined, in the description of the embodiments of the present application, terms such as "installation", "connection", "linkage", "fixation", "setting", etc. shall be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection, or an indirect connection through an intermediate medium; it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which the present application pertains, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0042] Embodiment 1:

[0043] Please refer to Figure 1 , Figure 1 which is the structural schematic diagram of a single-wire communication circuit provided by an embodiment of the present utility model.

[0044] As Figure 1 shown, the single-wire communication circuit includes a signal transmission interface ( Figure 1 TX port on the left), a signal reception interface ( Figure 1 RX port on the left), and an external communication interface ( Figure 1 COM port above). An emission unit circuit for mapping the signal of the signal transmission interface to the external communication interface is electrically connected between the signal transmission interface and the external communication interface, and a reception unit circuit for mapping the signal of the external communication interface to the signal reception interface is electrically connected between the signal reception interface and the external communication interface.

[0045] In this embodiment, the signal transmission interface is connected to an MCU (Micro-controller Unit), and the TX signal is output by the MCU and then transmitted to an external device; the signal reception interface is connected to the MCU, and the external communication signal is conveyed to the MCU through the signal reception interface of the reception unit circuit; it can be understood that the signal change of the TX port can be mapped by the external communication interface, and the external signal change of the external communication interface can be mapped on the RX port.

[0046] Specifically, the emission unit circuit includes a switching transistor QC3 and a switching transistor QC4. The positive connection terminal of the switching transistor QC3 is electrically connected to the working power supply VCC+, the control terminal of the switching transistor QC3 is electrically connected to the signal transmission interface, the negative connection terminal of the switching transistor QC3 is electrically connected to the control terminal of the switching transistor QC4, the positive connection terminal of the switching transistor QC4 is electrically connected to the external communication interface, and the negative connection terminal of the switching transistor QC4 is electrically connected to the first reference ground; wherein, when the signal transmission interface receives a low-level signal, the switching transistor QC3 is turned on and the switching transistor QC4 is turned on;

[0047] Further, the transmitting unit circuit further includes a resistor RC4, a resistor RC5, a resistor RC7, a resistor RC8, and a diode DC3;

[0048] The first end of the resistor RC5 is electrically connected to the signal transmitting interface, the first end of the resistor RC4 is electrically connected to the working power supply VCC+, the second end of the resistor RC5 is respectively electrically connected to the second end of the resistor RC4 and the control end of the switching transistor QC3, the negative connection terminal of the switching transistor QC3 is electrically connected to the positive electrode of the diode DC3, the negative electrode of the diode DC3 is electrically connected to the first end of the resistor RC7, the second end of the resistor RC7 is respectively electrically connected to the first end of the resistor RC8 and the control end of the switching transistor QC4, and the second end of the resistor RC8 is electrically connected to the first reference ground. In this embodiment, the first reference ground ( Figure 1 wherein C- / P-) is the negative electrode of the external communication interface of the circuit.

[0049] Further, the receiving unit circuit includes a switching transistor QC1 and a switching transistor QC2. There is a resistor R6 electrically connected between the control end of the switching transistor QC2 and the positive connection terminal of the switching transistor QC4. The negative connection terminal of the switching transistor QC2 is electrically connected to the first reference ground, the positive connection terminal of the switching transistor QC2 is electrically connected to the control end of the switching transistor QC1, the positive connection terminal of the switching transistor QC1 is electrically connected to the working power supply VCC+, the control end of the switching transistor QC1 is further electrically connected to the working power supply VCC+ through a resistor RC1, the negative connection terminal of the switching transistor QC1 is electrically connected to the first end of a resistor R1, and the second end of the resistor R1 is electrically connected to the signal receiving interface.

[0050] Furthermore, the first end of the resistor R6 is also electrically connected to the negative electrode of a diode D2, and the positive electrode of the diode D2 is electrically connected to the positive connection terminal of the switching transistor QC4;

[0051] The second end of the resistor R6 is also electrically connected to the first end of a resistor RC6, and the second end of the resistor RC6 is electrically connected to the first reference ground;

[0052] There is also a diode DC1 provided between the control end of the switching transistor QC1 and the positive connection terminal of the switching transistor QC2. The negative electrode of the diode DC1 is electrically connected to the positive connection terminal of the switching transistor QC2, and a resistor RC2 is electrically connected between the positive electrode of the diode DC1 and the control end of the switching transistor QC1;

[0053] The first end of the resistor R1 is also electrically connected to the first end of a resistor RC3, and the second end of the resistor RC3 is electrically connected to the second reference ground. In this embodiment, the second reference ground ( Figure 1 wherein GNDD) is the negative electrode of the battery of the circuit.

[0054] As a preferred embodiment, a high-voltage protection unit circuit is also electrically connected between the control end and the positive connection terminal of the switching transistor QC4;

[0055] The high-voltage protection unit circuit includes a switching transistor Q1. The negative terminal of the switching transistor Q1 is electrically connected to the first reference ground. The positive terminal of the switching transistor Q1 is electrically connected to the control terminal of the switching transistor QC4. A resistor R2 is also electrically connected between the control terminal of the switching transistor Q1 and the negative terminal of the switching transistor Q1. A voltage-dividing resistor is also electrically connected between the control terminal of the switching transistor Q1 and the positive terminal of the switching transistor QC4.

[0056] When an external high voltage is connected to the external communication interface, the positive and negative terminals of the switching transistor Q1 are turned on, pulling down the control terminal of the switching transistor QC4 to a low level, and the switching transistor QC4 is turned off or non-conductive.

[0057] When the COM port accidentally comes into contact with a high voltage, the switching transistor Q1 responds in a timely manner, pulling down the control terminal of the switching transistor QC4 to a low level, turning off or making the switching transistor QC4 non-conductive, thereby protecting the switching transistor QC4. Moreover, as the switching transistor QC4 is turned off, the external high voltage cannot affect the TX port or the RX port either, avoiding a high-voltage impact on the MCU and enhancing the safety protection ability of the single-wire communication.

[0058] More specifically, the voltage-dividing resistor includes a series-connected resistor R3 and resistor R4.

[0059] The first end of the resistor R3 is electrically connected to the control terminal of the switching transistor Q1. The second end of the resistor R3 is electrically connected to the first end of the resistor R4. The second end of the resistor R4 is electrically connected to the negative electrode of the diode D1. The positive electrode of the diode D1 is electrically connected to the positive terminal of the switching transistor QC4.

[0060] In this embodiment, as a preferred implementation manner, the switching transistors QC1 and QC3 are PNP triodes, and the switching transistors QC2 and QC4 are NPN triodes; the switching transistor Q1 is an NPN triode.

[0061] Exemplarily, if the external high voltage is +54V, the resistors R3 and R4 can be selected as 25KΩ resistors, and the resistor R2 is a 1KΩ resistor. According to the voltage-dividing principle, the voltage at the control terminal of the switching transistor Q1 is greater than the conduction voltage of the switching transistor Q1, and the collector and emitter of the switching transistor Q1 are turned on, further pulling down the control terminal of the switching transistor QC4 to a low level.

[0062] In this embodiment, the external communication interface is electrically connected to the controller power supply through a pull-up resistor R5. A fuse F1 is also electrically connected between the positive electrode of the diode D1 and the external communication interface.

[0063] In addition, as another feasible implementation, the PNP triode can be replaced by a PMOS switching transistor, and the NPN triode can be replaced by an NMOS switching transistor; since the working principle of the MOS switching transistor is prior art, it will not be elaborated here.

[0064] In this embodiment, by adding a high-voltage protection unit circuit to the single-wire communication circuit, when external high voltage is connected, it can effectively protect the components of the single-wire communication, reduce the risk of component damage, and moreover, this circuit does not need to use high-voltage-resistant switching tubes or diodes, with low cost and fast response time for high-voltage protection.

[0065] Embodiment 2:

[0066] The present utility model also provides an electrical equipment, including a battery provided with an external communication interface, and further including a single-wire communication circuit as described in Embodiment 1.

[0067] Since in Embodiment 1, the relevant structures and principles of the single-wire communication circuit have been explained in detail, they will not be elaborated in this embodiment.

[0068] In this embodiment, the electrical equipment is an electric vehicle. Since the electrical equipment in this embodiment effectively protects the interface for single-wire communication, the electrical equipment is not likely to fail, and even in case of high-voltage impact, it cannot cause the battery power display function of the electrical equipment to fail, improving the use stability and safety of the electrical equipment.

[0069] As described above, the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A single-wire communication circuit includes a signal transmission interface and an external communication interface. An emission unit circuit for mapping the signal of the signal transmission interface to the external communication interface is electrically connected between the signal transmission interface and the external communication interface; The emission unit circuit includes a switching transistor QC3 and a switching transistor QC4. The positive connection terminal of the switching transistor QC3 is electrically connected to the working power supply VCC+. The control terminal of the switching transistor QC3 is electrically connected to the signal emission interface. The negative connection terminal of the switching transistor QC3 is electrically connected to the control terminal of the switching transistor QC4. The positive connection terminal of the switching transistor QC4 is electrically connected to the external communication interface. The negative connection terminal of the switching transistor QC4 is electrically connected to the first reference ground; wherein, When the signal transmission interface receives a low-level signal, switch transistor QC3 conducts and switch transistor QC4 conducts; It is characterized in that a high-voltage protection unit circuit is also electrically connected between the control end of switch transistor QC4 and the positive connection terminal of switch transistor QC4; The high-voltage protection unit circuit includes switch transistor Q1. The negative connection terminal of switch transistor Q1 is electrically connected to the first reference ground. The positive connection terminal of switch transistor Q1 is electrically connected to the control end of switch transistor QC4. A resistor R2 is also electrically connected between the control end of switch transistor Q1 and the negative connection terminal of switch transistor Q1. A voltage-dividing resistor is also electrically connected between the control end of switch transistor Q1 and the positive connection terminal of switch transistor QC4; When an external high voltage is connected to the external communication interface, the positive connection terminal and the negative connection terminal of switch transistor Q1 conduct, pulling the control end of switch transistor QC4 to a low level, and switch transistor QC4 is turned off or non-conductive.

2. The single-wire communication circuit according to claim 1, characterized in that, The voltage-dividing resistor includes a series-connected resistor R3 and resistor R4; The first end of resistor R3 is electrically connected to the control end of switch transistor Q1. The second end of resistor R3 is electrically connected to the first end of resistor R4. The second end of resistor R4 is electrically connected to the negative electrode of diode D1. The positive electrode of diode D1 is electrically connected to the positive connection terminal of switch transistor QC4.

3. The single-wire communication circuit according to claim 2, wherein The external communication interface is electrically connected to the controller power supply through a pull-up resistor R5; A fuse F1 is also electrically connected between the positive electrode of diode D1 and the external communication interface.

4. A single-wire communication circuit according to claim 1, characterized in that, It also includes a signal reception interface. A reception unit circuit for mapping the signal of the external communication interface to the signal reception interface is electrically connected between the signal reception interface and the external communication interface; The reception unit circuit includes switch transistors QC1 and QC2. A resistor R6 is electrically connected between the control end of switch transistor QC2 and the positive connection terminal of switch transistor QC4. The negative connection terminal of switch transistor QC2 is electrically connected to the first reference ground. The positive connection terminal of switch transistor QC2 is electrically connected to the control end of switch transistor QC1. The positive connection terminal of switch transistor QC1 is electrically connected to the working power supply VCC+. The control end of switch transistor QC1 is also electrically connected to the working power supply VCC+ through a resistor RC1. The negative connection terminal of switch transistor QC1 is electrically connected to the first end of resistor R1. The second end of resistor R1 is electrically connected to the signal reception interface.

5. A single-wire communication circuit according to claim 4, wherein, The first end of resistor R6 is also electrically connected to the negative electrode of diode D2. The positive electrode of diode D2 is electrically connected to the positive connection terminal of switch transistor QC4; The second end of resistor R6 is also electrically connected to the first end of resistor RC6. The second end of resistor RC6 is electrically connected to the first reference ground; A diode DC1 is also provided between the control end of switch transistor QC1 and the positive connection terminal of switch transistor QC2. The negative electrode of diode DC1 is electrically connected to the positive connection terminal of switch transistor QC2. A resistor RC2 is also electrically connected between the positive electrode of diode DC1 and the control end of switch transistor QC1; The first end of resistor R1 is also electrically connected to the first end of resistor RC3. The second end of resistor RC3 is electrically connected to the second reference ground.

6. The single-wire communication circuit according to claim 1, characterized in that, The transmitting unit circuit further includes a resistor RC4, a resistor RC5, a resistor RC7, a resistor RC8, and a diode DC3; The first end of the resistor RC5 is electrically connected to the signal transmitting interface, the first end of the resistor RC4 is electrically connected to the working power supply VCC+, the second end of the resistor RC5 is respectively electrically connected to the second end of the resistor RC4 and the control end of the switching transistor QC3, the negative connection end of the switching transistor QC3 is electrically connected to the positive electrode of the diode DC3, the negative electrode of the diode DC3 is electrically connected to the first end of the resistor RC7, the second end of the resistor RC7 is respectively electrically connected to the first end of the resistor RC8 and the control end of the switching transistor QC4, and the second end of the resistor RC8 is electrically connected to the first reference ground.

7. The single-wire communication circuit according to claim 4, characterized in that, The switching transistors QC1 and QC3 are PNP triodes, the switching transistors QC2 and QC4 are NPN triodes; the switching transistor Q1 is an NPN triode.

8. An electrical device, comprising a battery provided with an external communication interface, characterized in that, It further includes a single-wire communication circuit as described in any one of claims 1-7.

9. An electrical device according to claim 8, characterized in that, The electrical device is an electric vehicle.

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