Stable voltage output circuit and charging wire

Abstract

The utility model provides a stable voltage output circuit which comprises an input power supply, a step-down circuit, an overcurrent protection circuit, an interface circuit and a current detection circuit. The input power supply provides voltage for the stable voltage output circuit, the voltage is reduced to target voltage through the step-down circuit, and then required current and voltage are provided for a terminal connected with the interface circuit for charging after overcurrent protection processing, and the current detection circuit can transmit voltage errors to a step-down chip of the step-down circuit. The step-down chip compensates and adjusts loss drop, so that current and voltage required by the terminal are achieved. Therefore, the utility model provides a hardware architecture which is helpful for compensating the voltage drop loss, reaching the normal voltage required by the power receiving equipment and passing the charging test authentication.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, and in particular to a stable voltage output circuit and a charging line. Background Art

[0002] With the rapid development of smart terminals, in order to solve users' power anxiety, manufacturers often significantly increase the charging speed, which inevitably increases the current of the stable voltage output circuit.

[0003] However, in high-current working scenarios, the charging circuit will cause voltage drops at the interface circuit due to line losses, which cannot meet the voltage required by the terminal device and thus cannot pass the charging certification. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a stable voltage output circuit and a charging cable, which can help compensate for voltage drop loss, achieve the normal voltage required by the powered device, and pass the charging test certification.

[0005] In a first aspect, an embodiment of the utility model provides a stable voltage output circuit, comprising:

[0006] Input power supply, step-down circuit, overcurrent protection circuit, interface circuit and current detection circuit;

[0007] The interface circuit comprises a first voltage input terminal and a first output terminal, the first voltage input terminal is electrically connected to the second terminal of the overcurrent protection circuit, and the first output terminal is electrically connected to the second terminal of the current detection circuit;

[0008] The step-down circuit includes a step-down chip, which includes a second voltage input terminal, a voltage output terminal and a current feedback terminal, the second voltage input terminal is electrically connected to an input power supply, the voltage output terminal is electrically connected to a first terminal of the overcurrent protection circuit, and the current feedback terminal is electrically connected to a first terminal of the current detection circuit.

[0009] The technical solution of the first aspect of the utility model has at least one of the following advantages or beneficial effects:

[0010] The input power supply provides voltage for the stable voltage output circuit, which is stepped down to the target voltage by the step-down circuit, and then after the overcurrent protection process, the required current and voltage are provided to the terminal connected to the interface circuit for charging, while the current detection circuit can transmit the voltage error to the step-down chip of the step-down circuit, and the step-down chip performs compensation and adjustment of the loss drop, thereby achieving the current and voltage required by the terminal. Therefore, the utility model provides a hardware architecture that can help compensate for the voltage drop loss, achieve the normal voltage required by the power receiving device, and pass the charging test certification.

[0011] Optionally, the current detection circuit includes a sixty-fifth resistor R65 and a sixty-fifth resistor R60, the first output end is electrically connected to the second end of the sixty-fifth resistor R65 and the second end of the sixtieth resistor R60, the first end of the sixtieth resistor R60 is electrically connected to the current feedback end, and the sixty-fifth resistor R65 is grounded.

[0012] Optionally, the stable voltage output circuit also includes an amplification circuit, which includes an operational amplifier, a first input terminal of the operational amplifier is electrically connected to the first end of the sixtieth resistor R60, a second input terminal of the operational amplifier is grounded, and an output terminal of the operational amplifier is electrically connected to the current feedback terminal.

[0013] Optionally, the amplifying circuit further includes a sixty-first resistor R61, a sixty-fourth resistor R64, a one hundred and sixty-third resistor R163, a one hundred and sixty-second resistor R162 and a fourteenth field effect transistor Q14;

[0014] The second input terminal of the operational amplifier is electrically connected to the first terminal of the sixty-first resistor R61 and the second terminal of the sixty-fourth resistor R64, and the second terminal of the sixty-first resistor R61 is grounded;

[0015] The output end of the operational amplifier is electrically connected to the first end of the sixty-fourth resistor R64 and the second end of the first sixty-third resistor R163, the first end of the first sixty-third resistor R163 is electrically connected to the first end of the first sixty-second resistor R162 and the gate of the fourteenth field effect transistor Q14, the source of the fourteenth field effect transistor Q14 is electrically connected to the second end of the first sixty-second resistor R162, and the drain of the fourteenth field effect transistor Q14 is electrically connected to the current feedback end.

[0016] Optionally, the amplifying circuit further includes an eighteenth resistor R18, a nineteenth resistor R19 and a one hundred and sixty-fourth resistor R164;

[0017] The drain of the fourteenth field effect transistor Q14 is electrically connected to the second end of the first sixty-fourth resistor R164, the first end of the first sixty-fourth resistor R164 is electrically connected to the first end of the nineteenth resistor R19 and the second end of the eighteenth resistor R18, the first end of the eighteenth resistor R18 is electrically connected to the current feedback end, and the second end of the nineteenth resistor R19 is grounded.

[0018] Optionally, the step-down circuit also includes a first one hundred and eighty-seventh capacitor C187 and a fourth inductor L4, the voltage output end includes a first voltage output end and a second voltage output end, the first voltage output end is electrically connected to the first end of the fourth inductor L4, the second voltage output end is electrically connected to the first end of the first one hundred and eighty-seventh capacitor C187, the second end of the first one hundred and eighty-seventh capacitor C187 is electrically connected to the first end of the fourth inductor L4, and the second end of the fourth inductor L4 is electrically connected to the first voltage input end.

[0019] Optionally, the step-down circuit also includes a 50th capacitor C50 and a 23rd resistor R23, the second voltage input terminal is electrically connected to the first end of the 50th capacitor C50 and the first end of the 23rd resistor R23, and the second end of the 50th capacitor C50 and the second end of the 23rd resistor R23 are grounded.

[0020] Optionally, the overcurrent protection circuit includes a sixty-eighth resistor R68, a seventy-sixth resistor R76, a seventy-seventh resistor R77 and a one-hundred-and-forty-fifth resistor R145, and the interface circuit further includes a signal negative terminal and a signal positive terminal;

[0021] The signal negative terminal is electrically connected to the second end of the sixty-eighth resistor R68 and the second end of the first one hundred and forty-fifth resistor R145;

[0022] The signal positive terminal is electrically connected to the second end of the seventy-sixth resistor R76 and the second end of the seventy-seventh resistor R77;

[0023] The first end of the sixty-eighth resistor R68 and the first end of the seventy-sixth resistor R76 are electrically connected to the first voltage input terminal, and the first end of the one-hundred-forty-fifth resistor R145 and the first end of the seventy-seventh resistor R77 are connected.

[0024] Optionally, the overcurrent protection circuit further includes a one hundred and ninety-second capacitor C192, a one hundred and ninety-fourth capacitor C194 and a one hundred and ninety-sixth capacitor C196;

[0025] The first voltage input terminal is electrically connected to the first end of the first-hundred-ninety-second capacitor C192, the first end of the first-hundred-ninety-fourth capacitor C194 and the first end of the first-hundred-ninety-sixth capacitor C196, and the second end of the first-hundred-ninety-second capacitor C192, the second end of the first-hundred-ninety-fourth capacitor C194 and the second end of the first-hundred-ninety-sixth capacitor C196 are grounded.

[0026] In a second aspect, an embodiment of the utility model further provides a charging cable, comprising a stable voltage output circuit as in any of the above embodiments.

[0027] The technical solution of the second aspect of the utility model has at least one of the following advantages or beneficial effects:

[0028] The input power supply provides voltage for the stable voltage output circuit, which is stepped down to the target voltage by the step-down circuit, and then after the overcurrent protection process, the terminal connected to the interface circuit is provided with the required current and voltage for charging, while the current detection circuit can transmit the voltage error to the step-down chip of the step-down circuit, and the step-down chip performs compensation and adjustment of the loss drop, thereby achieving the current and voltage required by the terminal. Therefore, the utility model also provides a charging cable, which can help compensate for the voltage drop loss, achieve the normal voltage required by the receiving device, and pass the charging test certification. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Figure 1 A module schematic diagram of a stable voltage output circuit provided by the utility model;

[0031] Figure 2 A circuit diagram of a stable voltage output circuit provided by the utility model;

[0032] Figure 3 This is a circuit module diagram of a stable voltage output circuit provided by the utility model. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0036] In this specification, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The utility model provides a stable voltage output circuit and a charging line, which can help to compensate for voltage drop loss, reach the normal voltage required by the powered equipment, and pass the charging test certification.

[0039] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0040] In one embodiment, referring to Figure 1-3 , Figure 1 A schematic diagram of a module of a stable voltage output circuit provided by an embodiment of the utility model, Figure 2 A circuit diagram of a stable voltage output circuit provided by an embodiment of the utility model, Figure 3 A circuit module diagram of a stable voltage output circuit provided in one embodiment of the utility model.

[0041] A stable voltage output circuit comprises: an input power supply, a step-down circuit, an overcurrent protection circuit, an interface circuit and a current detection circuit; the interface circuit comprises a first voltage input terminal and a first output terminal, the first voltage input terminal is electrically connected to the second terminal of the overcurrent protection circuit, and the first output terminal is electrically connected to the second terminal of the current detection circuit; the step-down circuit comprises a step-down chip, the step-down chip comprises a second voltage input terminal, a voltage output terminal and a current feedback terminal, the second voltage input terminal is electrically connected to the input power supply, the voltage output terminal is electrically connected to the first terminal of the overcurrent protection circuit, and the current feedback terminal is electrically connected to the first terminal of the current detection circuit.

[0042] Specifically, the input power supply provides voltage for the stable voltage output circuit, which is stepped down to the target voltage by the step-down circuit, and then after the overcurrent protection process, the required current and voltage are provided to the terminal connected to the interface circuit for charging, and the current detection circuit can transmit the voltage error to the step-down chip of the step-down circuit, and the step-down chip performs compensation and adjustment of the loss drop, thereby achieving the current and voltage required by the terminal. Therefore, the utility model provides a hardware architecture that can help compensate for the voltage drop loss, achieve the normal voltage required by the powered device, and pass the charging test certification.

[0043] The first voltage input terminal of the interface circuit can be Figure 2 The VBUS end of the middle interface CON7, the first output end can be Figure 2 The GND terminal of the middle interface CON7 that is not directly grounded, the second voltage input terminal of the buck chip can be Figure 2 The VIN terminal of U1 in the figure can be Figure 2 The LX and BS terminals of U1 in the figure, the current feedback terminal can be Figure 2 The FB terminal of U1 in.

[0044] In one embodiment, the current detection circuit includes a sixty-fifth resistor R65 and a sixty-fifth resistor R60, the first output end is electrically connected to the second end of the sixty-fifth resistor R65 and the second end of the sixtieth resistor R60, the first end of the sixtieth resistor R60 is electrically connected to the current feedback end, and the sixty-fifth resistor R65 is grounded.

[0045] In one embodiment, in order to accurately detect the current of the current detection circuit facing the ground, the stable voltage output circuit also includes an amplification circuit, and the amplification circuit includes an operational amplifier, a first input terminal of the operational amplifier is electrically connected to the first end of the sixtieth resistor R60, a second input terminal of the operational amplifier is grounded, and an output terminal of the operational amplifier is electrically connected to the current feedback terminal.

[0046] Wherein, the first input terminal of the operational amplifier may be Figure 2The +IN terminal of U7 in the figure, the second input terminal of the operational amplifier can be Figure 2 The -IN terminal of U7 in the figure, the output terminal of the operational amplifier can be Figure 2 The OUT terminal of U7.

[0047] In one embodiment, the amplifying circuit further includes a sixty-first resistor R61, a sixty-fourth resistor R64, a one hundred and sixty-third resistor R163, a one hundred and sixty-second resistor R162 and a fourteenth field effect transistor Q14;

[0048] The second input terminal of the operational amplifier is electrically connected to the first terminal of the sixty-first resistor R61 and the second terminal of the sixty-fourth resistor R64, and the second terminal of the sixty-first resistor R61 is grounded;

[0049] The output end of the operational amplifier is electrically connected to the first end of the sixty-fourth resistor R64 and the second end of the first sixty-third resistor R163, the first end of the first sixty-third resistor R163 is electrically connected to the first end of the first sixty-second resistor R162 and the gate of the fourteenth field effect transistor Q14, the source of the fourteenth field effect transistor Q14 is electrically connected to the second end of the first sixty-second resistor R162, and the drain of the fourteenth field effect transistor Q14 is electrically connected to the current feedback end.

[0050] In one embodiment, the amplifying circuit further includes an eighteenth resistor R18, a nineteenth resistor R19 and a one hundred and sixty-fourth resistor R164;

[0051] The drain of the fourteenth field effect transistor Q14 is electrically connected to the second end of the first sixty-fourth resistor R164, the first end of the first sixty-fourth resistor R164 is electrically connected to the first end of the nineteenth resistor R19 and the second end of the eighteenth resistor R18, the first end of the eighteenth resistor R18 is electrically connected to the current feedback end, and the second end of the nineteenth resistor R19 is grounded.

[0052] In one embodiment, the step-down circuit also includes a first one hundred and eighty-seventh capacitor C187 and a fourth inductor L4, and the voltage output end includes a first voltage output end and a second voltage output end, the first voltage output end is electrically connected to the first end of the fourth inductor L4, the second voltage output end is electrically connected to the first end of the first one hundred and eighty-seventh capacitor C187, the second end of the first one hundred and eighty-seventh capacitor C187 is electrically connected to the first end of the fourth inductor L4, and the second end of the fourth inductor L4 is electrically connected to the first voltage input end.

[0053] Wherein, the first voltage output terminal may be Figure 2 The LX terminal of U1, the second voltage output terminal can be Figure 2 The BS side in the.

[0054] In one embodiment, in order to ensure current stability, the step-down circuit also includes a fiftieth capacitor C50 and a twenty-third resistor R23, the second voltage input terminal is electrically connected to the first end of the fiftieth capacitor C50 and the first end of the twenty-third resistor R23, and the second end of the fiftieth capacitor C50 and the second end of the twenty-third resistor R23 are grounded.

[0055] In one embodiment, the overcurrent protection circuit includes a sixty-eighth resistor R68, a seventy-sixth resistor R76, a seventy-seventh resistor R77 and a one-hundred-and-forty-fifth resistor R145, and the interface circuit further includes a signal negative terminal and a signal positive terminal;

[0056] The signal negative terminal is electrically connected to the second end of the sixty-eighth resistor R68 and the second end of the first one hundred and forty-fifth resistor R145;

[0057] The signal positive terminal is electrically connected to the second end of the seventy-sixth resistor R76 and the second end of the seventy-seventh resistor R77;

[0058] The first end of the sixty-eighth resistor R68 and the first end of the seventy-sixth resistor R76 are electrically connected to the first voltage input terminal, and the first end of the one-hundred-forty-fifth resistor R145 and the first end of the seventy-seventh resistor R77 are connected.

[0059] Wherein, the negative signal terminal can be Figure 2 The DM terminal of the middle interface CON7, the positive signal terminal can be Figure 2 DP end of the middle interface CON7.

[0060] In one embodiment, the overcurrent protection circuit further includes a one hundred and ninety-second capacitor C192, a one hundred and ninety-fourth capacitor C194, and a one hundred and ninety-sixth capacitor C196;

[0061] The first voltage input terminal is electrically connected to the first end of the first-hundred-ninety-second capacitor C192, the first end of the first-hundred-ninety-fourth capacitor C194 and the first end of the first-hundred-ninety-sixth capacitor C196, and the second end of the first-hundred-ninety-second capacitor C192, the second end of the first-hundred-ninety-fourth capacitor C194 and the second end of the first-hundred-ninety-sixth capacitor C196 are grounded.

[0062] Another embodiment of the present invention further provides a charging cable, comprising a stable voltage output circuit as described in any of the above embodiments.

[0063] The charging cable uses the stable voltage output circuit of any of the above embodiments, the input power supply provides voltage for the stable voltage output circuit, the voltage is stepped down to the target voltage by the step-down circuit, and then after the overcurrent protection process, the required current and voltage are provided to the terminal connected to the interface circuit for charging, and the current detection circuit can transmit the voltage error to the step-down chip of the step-down circuit, and the step-down chip performs compensation and adjustment of the loss drop, thereby achieving the current and voltage required by the terminal. Therefore, the utility model also provides a charging cable that can help compensate for the voltage drop loss, achieve the normal voltage required by the receiving device, and pass the charging test certification.

[0064] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0065] copy

[0066] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A stable voltage output circuit, characterized in that: The stable voltage output circuit includes an input power supply, a step-down circuit, an overcurrent protection circuit, an interface circuit and a current detection circuit; The interface circuit comprises a first voltage input terminal and a first output terminal, the first voltage input terminal is electrically connected to the second terminal of the overcurrent protection circuit, and the first output terminal is electrically connected to the second terminal of the current detection circuit; The step-down circuit includes a step-down chip, which includes a second voltage input terminal, a voltage output terminal and a current feedback terminal, the second voltage input terminal is electrically connected to an input power supply, the voltage output terminal is electrically connected to a first terminal of the overcurrent protection circuit, and the current feedback terminal is electrically connected to a first terminal of the current detection circuit.

2. The stable voltage output circuit according to claim 1, characterized in that: The current detection circuit includes a sixty-fifth resistor R65 and a sixty-fifth resistor R60, the first output end is electrically connected to the second end of the sixty-fifth resistor R65 and the second end of the sixtieth resistor R60, the first end of the sixtieth resistor R60 is electrically connected to the current feedback end, and the sixty-fifth resistor R65 is grounded.

3. The stable voltage output circuit according to claim 2, characterized in that: The stable voltage output circuit also includes an amplifier circuit, which includes an operational amplifier, a first input terminal of the operational amplifier is electrically connected to the first end of the sixtieth resistor R60, a second input terminal of the operational amplifier is grounded, and an output terminal of the operational amplifier is electrically connected to the current feedback terminal.

4. The stable voltage output circuit according to claim 3, characterized in that: The amplifying circuit further includes a sixty-first resistor R61, a sixty-fourth resistor R64, a one hundred and sixty-third resistor R163, a one hundred and sixty-second resistor R162 and a fourteenth field effect transistor Q14; The second input terminal of the operational amplifier is electrically connected to the first terminal of the sixty-first resistor R61 and the second terminal of the sixty-fourth resistor R64, and the second terminal of the sixty-first resistor R61 is grounded; The output end of the operational amplifier is electrically connected to the first end of the sixty-fourth resistor R64 and the second end of the first sixty-third resistor R163, the first end of the first sixty-third resistor R163 is electrically connected to the first end of the first sixty-second resistor R162 and the gate of the fourteenth field effect transistor Q14, the source of the fourteenth field effect transistor Q14 is electrically connected to the second end of the first sixty-second resistor R162, and the drain of the fourteenth field effect transistor Q14 is electrically connected to the current feedback end.

5. The stable voltage output circuit according to claim 4, characterized in that: The amplifying circuit further includes an eighteenth resistor R18, a nineteenth resistor R19 and a one hundred and sixty-fourth resistor R164; The drain of the fourteenth field effect transistor Q14 is electrically connected to the second end of the first sixty-fourth resistor R164, the first end of the first sixty-fourth resistor R164 is electrically connected to the first end of the nineteenth resistor R19 and the second end of the eighteenth resistor R18, the first end of the eighteenth resistor R18 is electrically connected to the current feedback end, and the second end of the nineteenth resistor R19 is grounded.

6. The stable voltage output circuit according to claim 1, characterized in that: The step-down circuit also includes a first one hundred and eighty-seventh capacitor C187 and a fourth inductor L4, and the voltage output end includes a first voltage output end and a second voltage output end, the first voltage output end is electrically connected to the first end of the fourth inductor L4, the second voltage output end is electrically connected to the first end of the first one hundred and eighty-seventh capacitor C187, the second end of the first one hundred and eighty-seventh capacitor C187 is electrically connected to the first end of the fourth inductor L4, and the second end of the fourth inductor L4 is electrically connected to the first voltage input end.

7. The stable voltage output circuit according to claim 6, characterized in that: The step-down circuit also includes a 50th capacitor C50 and a 23rd resistor R23, the second voltage input terminal is electrically connected to a first end of the 50th capacitor C50 and a first end of the 23rd resistor R23, and a second end of the 50th capacitor C50 and a second end of the 23rd resistor R23 are grounded.

8. The stable voltage output circuit according to claim 1, characterized in that: The overcurrent protection circuit includes a sixty-eighth resistor R68, a seventy-sixth resistor R76, a seventy-seventh resistor R77 and a one-hundred-and-forty-fifth resistor R145, and the interface circuit also includes a signal negative terminal and a signal positive terminal; The signal negative terminal is electrically connected to the second end of the sixty-eighth resistor R68 and the second end of the first one hundred and forty-fifth resistor R145; The signal positive terminal is electrically connected to the second end of the seventy-sixth resistor R76 and the second end of the seventy-seventh resistor R77; The first end of the sixty-eighth resistor R68 and the first end of the seventy-sixth resistor R76 are electrically connected to the first voltage input terminal, and the first end of the one-hundred-forty-fifth resistor R145 and the first end of the seventy-seventh resistor R77 are connected.

9. The stable voltage output circuit according to claim 8, characterized in that: The overcurrent protection circuit also includes a one hundred and ninety-second capacitor C192, a one hundred and ninety-fourth capacitor C194 and a one hundred and ninety-sixth capacitor C196; The first voltage input terminal is electrically connected to the first end of the first-hundred-ninety-second capacitor C192, the first end of the first-hundred-ninety-fourth capacitor C194 and the first end of the first-hundred-ninety-sixth capacitor C196, and the second end of the first-hundred-ninety-second capacitor C192, the second end of the first-hundred-ninety-fourth capacitor C194 and the second end of the first-hundred-ninety-sixth capacitor C196 are grounded.

10. A charging cable, characterized in that: A stable voltage output circuit as claimed in any one of claims 1 to 9.

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