Main power-off circuit, main and standby power switching circuit, remote communication module and automobile

Abstract

The utility model discloses a main power-off circuit, a main and standby power switching circuit, a remote communication module and an automobile, and relates to the field of automobiles. The main electricity power-off circuit is connected with a port of the microcontroller and the main electricity power supply circuit, so that logic comparison can be carried out on a high logic level output by the microcontroller and a main electricity voltage of the main electricity power supply circuit, when the main electricity voltage drops to a first voltage, the control circuit can utilize the high logic level to conduct a control interface, and meanwhile, the main electricity power-off circuit is connected with the main electricity power supply circuit. Because the discharge circuit is connected with the control interface and the electrolytic capacitor in the main power supply circuit, when the control interface is conducted, the discharge circuit can discharge the electrolytic capacitor. According to the main electricity power-off circuit, the electrolytic capacitor can be rapidly discharged when the main electricity voltage drops, then rapid power-off reset of an electric appliance in the remote communication module is achieved, when the main electricity voltage supplies power normally, the control interface is in a closed state, and at the moment, normal work of the main electricity power supply circuit cannot be affected.

Description

Technical Field

[0001] The utility model relates to the automobile field, in particular to a main power off circuit. The utility model also relates to a main power switch circuit including the main power off circuit, a remote communication module and an automobile. Background Art

[0002] In a complete vehicle, the remote communication module needs to support the emergency call function, that is, when the main power supply drops or the connector of the main power supply falls off, the backup power supply needs to supply power to the electrical appliances and support the call function. At this time, the remote communication module needs to be equipped with a backup battery power supply circuit and a main backup power switching circuit.

[0003] In the prior art, the main power is discharged by the subsequent load in the main-backup power switching circuit. However, since the entire vehicle will be in a dormant state, the remote communication module is also in a dormant state at this time, and the main power supply discharges slowly in the dormant state, so when the connector of the main power supply falls off, the electrolytic capacitor in the remote communication module continues to supply power to the subsequent circuit. Therefore, the controller that only works under the main power supply will maintain the state before the main power supply is powered off, resulting in the inability of the electrical appliance to quickly reset after power failure.

[0004] Therefore, how to quickly discharge the electricity of the electrolytic capacitor to achieve a fast power-off reset of the electrical appliances in the remote communication module is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0005] The purpose of the utility model is to provide a main power off circuit, so that the electrical appliances in the remote communication module can be quickly powered off and reset. Another purpose of the utility model is to provide a main-backup power switching circuit, a remote communication module and a car including the main power off circuit.

[0006] In order to solve the above technical problems, the utility model provides a main power-off circuit, comprising: a control circuit and a discharge circuit;

[0007] The control circuit is connected to the port of the microcontroller and to the main power supply circuit; the control circuit is used to perform a logic comparison between the high logic level output by the microcontroller and the main power voltage of the main power supply circuit, and when the main power voltage is less than or equal to the first voltage, the control interface of the control circuit is turned on using the high logic level;

[0008] The discharge circuit is connected to the control interface and to the electrolytic capacitor in the main power supply circuit; the discharge circuit is used to discharge the electrolytic capacitor when the control interface is turned on.

[0009] Optionally, the control circuit includes: a first diode, a second diode and a first NPN transistor;

[0010] The anode of the first diode is connected to the main power supply circuit, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the base of the first NPN transistor, the emitter of the first NPN transistor is connected to the port of the microcontroller, and the collector of the first NPN transistor is connected to the control interface;

[0011] A first diode, used for conducting the main power voltage in a unidirectional manner;

[0012] a second diode, configured to be turned on when the main power voltage is less than or equal to the first voltage;

[0013] The first NPN transistor is used to be turned on when the second diode is turned on, and to control the high logic level to turn on the control interface.

[0014] Optionally, the discharge circuit includes: a first PNP transistor;

[0015] The base of the first PNP transistor is connected to the control interface, the collector of the first PNP transistor is connected to the electrolytic capacitor, and the emitter of the first PNP transistor is grounded;

[0016] The first PNP transistor is used to be turned on when the control interface is turned on, so as to discharge the electrolytic capacitor.

[0017] The utility model also provides a main power and standby power switching circuit, comprising: the main power off circuit, the standby power supply circuit and the main power supply circuit;

[0018] The backup power supply circuit is used to supply power to the subsequent electrical appliances when the control interface is turned on;

[0019] The main power supply circuit is used to supply power to subsequent electrical appliances and electrolytic capacitors when the control interface is not conducting.

[0020] Optionally, the backup power supply circuit includes: a backup power supply, a second PNP transistor, a first PMOS transistor and a second PMOS transistor;

[0021] The base of the second PNP transistor is connected to the control interface, the collector of the second PNP transistor is connected to the G electrode of the first PMOS tube and the G electrode of the second PMOS tube, and the emitter of the second PNP transistor is grounded; the second PNP transistor is used to be turned on when the control interface is turned on;

[0022] The D pole of the first PMOS tube is connected to the backup power supply, the S pole of the first PMOS tube is connected to the S pole of the second PMOS tube, and the D pole of the second PMOS tube is connected to the subsequent electrical appliance; the first PMOS tube and the second PMOS tube are used to be turned on when the second PNP transistor is turned on, so as to control the backup power supply to provide a backup power voltage to the subsequent electrical appliance.

[0023] Optionally, the backup power supply circuit further includes: a backup power boost circuit;

[0024] The backup power boost circuit is connected to the backup power supply and the D pole of the first PMOS tube; the backup power boost circuit is used to boost the voltage of the backup power supply to obtain the backup power voltage.

[0025] Optionally, the main power supply circuit includes: a main power supply, an electrolytic capacitor, a second NPN transistor and a third PMOS transistor;

[0026] The main power supply is used to provide the main power voltage to supply power to the subsequent electrical appliances and electrolytic capacitors;

[0027] The base of the second NPN transistor is connected to the main power supply, the collector of the second NPN transistor is connected to the G pole of the third PMOS transistor, and the emitter of the second NPN transistor is grounded; the second NPN transistor is used to be turned on when the main power voltage is greater than the first voltage;

[0028] The D pole of the third PMOS tube is connected to the electrolytic capacitor, and the S pole of the third PMOS tube is connected to the subsequent electrical appliance; the third PMOS tube is used to be turned on when the second NPN transistor is turned on, and control the main power supply to provide the main power voltage to the subsequent electrical appliance.

[0029] Optionally, the second NPN transistor is further configured to be disconnected when the main power voltage is less than or equal to the first voltage;

[0030] The third PMOS tube is also used to be disconnected when the second NPN transistor is disconnected, and control the main power supply to stop providing the main power voltage to the subsequent electrical appliances.

[0031] The utility model also provides a remote communication module, comprising the above-mentioned main and standby power switching circuit.

[0032] The utility model also provides a car, comprising the above-mentioned remote communication module.

[0033] Compared with the above background technology, the main power-off circuit provided by the utility model can perform a logic comparison between the high logic level output by the microcontroller and the main power voltage of the main power supply circuit by connecting the port of the microcontroller and the main power supply circuit. When the main power voltage drops to the first voltage, the control circuit can use the high logic level to turn on the control interface. At the same time, since the discharge circuit is connected to the control interface and the electrolytic capacitor in the main power supply circuit, when the control interface is turned on, the discharge circuit can discharge the electrolytic capacitor. Through the above main power-off circuit, it is possible to achieve rapid discharge of the electrolytic capacitor when the main power voltage drops, thereby achieving rapid power-off reset of the electrical appliances in the remote communication module. When the main power voltage is normally supplied, the control interface is in a closed state, and the normal operation of the main power supply circuit will not be affected at this time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a main power-off circuit provided by the utility model;

[0035] Figure 2 A schematic diagram of a control circuit provided by the utility model;

[0036] Figure 3 A schematic diagram of a discharge circuit provided by the utility model;

[0037] Figure 4 A schematic diagram of a main and standby power switching circuit provided by the utility model;

[0038] Figure 5 A schematic diagram of a backup power supply circuit provided by the utility model;

[0039] Figure 6 The present invention is a schematic diagram of a main power supply circuit. DETAILED DESCRIPTION

[0040] The core of the utility model is to provide a main power off circuit, so that the electrical appliances in the remote communication module can be quickly powered off and reset. The utility model also provides a main and standby power switching circuit including the main power off circuit, a remote communication module and a car.

[0041] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] See also Figure 1 , Figure 1 The utility model is a schematic diagram of a main power-off circuit provided by the utility model.

[0043] The main power-off circuit may include: a control circuit and a discharge circuit, and the control circuit and the discharge circuit are connected to each other.

[0044] The control circuit can be connected to the port of the microcontroller and to the main power supply circuit. The control circuit is used to perform a logic comparison between the high logic level output by the microcontroller and the main power voltage of the main power supply circuit, and when the main power voltage is less than or equal to the first voltage, the control interface of the control circuit is turned on using the high logic level.

[0045] The discharge circuit is connected to the control interface and to the electrolytic capacitor in the main power supply circuit. The discharge circuit is used to discharge the electrolytic capacitor when the control interface is turned on.

[0046] It should be noted that the microcontroller will continuously output a high logic level to the control circuit, wherein the high logic level may be 3.3V.

[0047] The voltage value of the first voltage should be less than the working voltage of the main power supply circuit under normal working conditions, and the specific value of the first voltage can be set according to actual needs. Taking the main power supply circuit using a 12V main power supply as an example, the working voltage of the main power supply circuit under normal working conditions should be 9-12V. When the main power voltage drops to 6V, it can be considered that the main power-off circuit needs to discharge the electrolytic capacitor in the main power supply circuit. At this time, the voltage value of the first voltage can be set to 6V.

[0048] The control interface is respectively connected to the control circuit and the discharge circuit. When the control interface is turned on, the discharge circuit is turned on, and the main power-off circuit can use the discharge circuit to discharge the electrolytic capacitor in the main power supply circuit. When the control interface is not turned on, the discharge circuit is also not turned on. At this time, the main power-off circuit will not interfere with the normal operation of the main power-off circuit.

[0049] The main power-off circuit is connected to the port of the microcontroller and the main power supply circuit, so it can perform a logical comparison between the high logic level output by the microcontroller and the main power voltage of the main power supply circuit. When the main power voltage drops to the first voltage, the control circuit can use the high logic level to turn on the control interface. At the same time, since the discharge circuit is connected to the control interface and the electrolytic capacitor in the main power supply circuit, when the control interface is turned on, the discharge circuit can discharge the electrolytic capacitor. Through the above-mentioned main power-off circuit, it is possible to achieve rapid discharge of the electrolytic capacitor when the main power voltage drops, thereby achieving rapid power-off reset of the electrical appliances in the remote communication module. When the main power voltage is normally supplied, the control interface is in a closed state, and the normal operation of the main power supply circuit will not be affected at this time.

[0050] See also Figure 2 , Figure 2 A schematic diagram of a control circuit provided by the utility model, Figure 2 A possible connection relationship of the control circuit is shown.

[0051] The control circuit may include: a first diode, a second diode and a first NPN transistor.

[0052] The anode of the first diode is connected to the main power supply circuit, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the base of the first NPN transistor, the emitter of the first NPN transistor is connected to the port of the microcontroller, and the collector of the first NPN transistor is connected to the control interface.

[0053] The first diode is used for conducting the main power voltage in a unilateral manner. When the second diode is turned on, the first diode is also used for protecting the main power voltage from being reversely fed.

[0054] The second diode is used to conduct when the main power voltage is less than or equal to the first voltage. Due to the unidirectional conductivity of the diode, the second diode will use its positive electrode voltage and negative electrode voltage for logical comparison. When the main power voltage is greater than the first voltage, the positive electrode voltage is less than the negative electrode voltage, the second diode is in a closed state, and the control interface is also in a closed state; when the main power voltage is less than or equal to the first voltage, the positive electrode voltage is greater than the negative electrode voltage, the second diode can be conducted, and the control interface can also be conducted.

[0055] The first NPN transistor is used to be turned on when the second diode is turned on, and to control the high logic level to turn on the control interface.

[0056] By performing logical comparison in the control circuit, control can be performed according to the voltage state of the main power supply circuit. When the main power voltage drops to the first voltage, the control interface is turned on in time, so that the electrolytic capacitor in the main power supply circuit is discharged by the discharge circuit.

[0057] It should be noted that Figure 2 The capacitor and resistor in the circuit can be set according to actual needs, wherein the capacitor can be set based on filtering requirements, and the resistance value and voltage division relationship of the resistor can also be set according to the specific value of the first voltage.

[0058] See also Figure 3 , Figure 3 A schematic diagram of a discharge circuit provided by the utility model. Figure 3 A possible connection relationship of the discharge circuit is shown.

[0059] The discharge circuit may include a first PNP transistor.

[0060] The base of the first PNP transistor is connected to the control interface, the collector of the first PNP transistor is connected to the electrolytic capacitor, and the emitter of the first PNP transistor is grounded.

[0061] The first PNP transistor is used to be turned on when the control interface is turned on, so as to discharge the electrolytic capacitor.

[0062] By opening the first PNP transistor, the discharge circuit can quickly discharge the electricity in the electrolytic capacitor. At this time, the subsequent electrical appliances can quickly perform power-off reset. Therefore, when the main power supply circuit supplies power to the subsequent electrical appliances again, the subsequent electrical appliances can work normally.

[0063] It should be noted that Figure 3 The resistance in can also be set according to actual needs.

[0064] The utility model also provides a main power switching circuit, see Figure 4 , Figure 4The present invention is a schematic diagram of a main-standby power switching circuit.

[0065] The main power switching circuit may include: the main power power-off circuit, the backup power supply circuit and the main power supply circuit.

[0066] Among them, the description of the main power-off circuit can refer to the above introduction and will not be repeated here.

[0067] The backup power supply circuit is used to supply power to subsequent electrical appliances when the control interface is turned on.

[0068] The main power supply circuit is used to supply power to subsequent electrical appliances and electrolytic capacitors when the control interface is not conducting.

[0069] It should be noted that when the control interface is not turned on, the backup power supply circuit does not supply power to the subsequent electrical appliances; and when the control interface is turned on, the main power supply circuit does not supply power to the subsequent electrical appliances and the electrolytic capacitor.

[0070] Since the main-standby power switching circuit includes a main power power-off circuit, a standby power supply circuit and a main power supply circuit, the main power supply circuit can supply power to subsequent electrical appliances under normal working conditions. At this time, the control interface is not conductive. When the main power voltage drops to a first voltage, the control interface is conductive, and the standby power supply circuit is switched to supply power to subsequent electrical appliances. The main power-off circuit can discharge the electric charge of the electrolytic capacitor in the main power supply circuit. The main-standby power switching circuit can thus realize normal switching between main power supply and standby power supply, and can discharge the electric charge stored in the electrolytic capacitor during main power supply, so that subsequent electrical appliances can work normally.

[0071] See also Figure 5 , Figure 5 A schematic diagram of a backup power supply circuit provided by the utility model. Figure 5 A possible connection relationship of the backup power supply circuit is shown.

[0072] The backup power supply circuit may include: a backup power supply, a second PNP transistor, a first PMOS transistor and a second PMOS transistor.

[0073] The base of the second PNP transistor is connected to the control interface, the collector of the second PNP transistor is connected to the G pole of the first PMOS tube and the G pole of the second PMOS tube, and the emitter of the second PNP transistor is grounded. The second PNP transistor is used to be turned on when the control interface is turned on.

[0074] The D pole of the first PMOS tube is connected to the backup power supply, the S pole of the first PMOS tube is connected to the S pole of the second PMOS tube, and the D pole of the second PMOS tube is connected to the subsequent electrical appliance. The first PMOS tube and the second PMOS tube are used to be turned on when the second PNP transistor is turned on, so as to control the backup power supply to provide a backup voltage to the subsequent electrical appliance.

[0075] The first PMOS tube is also used to prevent the backup power voltage from flowing back.

[0076] Since the second PNP transistor in the backup power supply circuit is connected to the control interface, the opening and closing of the backup power supply circuit is also determined by the main power voltage. When the main power voltage drops to the first voltage, the second PNP transistor, the first PMOS transistor and the second PMOS transistor are turned on, and the subsequent electrical appliances are switched from the main power supply to the backup power supply.

[0077] It should be noted that Figure 5 The resistance in can also be set according to actual needs.

[0078] Since the backup power supply is usually 3.3V, the backup power supply circuit may further include a backup power boost circuit, which boosts the voltage of the backup power supply to reach the power supply voltage required by the subsequent electrical appliances.

[0079] The backup power boost circuit can be connected to the backup power supply and the D pole of the first PMOS tube. The backup power boost circuit is used to boost the voltage of the backup power supply to obtain the backup power voltage.

[0080] Specifically, the backup power voltage obtained after the boost may be 8 V. It should be noted that the specific voltage value of the backup power voltage may also be set according to actual needs, and is not limited to the 8 V in the above example.

[0081] See also Figure 6 , Figure 6 This is a schematic diagram of a main power supply circuit provided by the utility model. Figure 6 A possible connection relationship of the main power supply circuit is shown, wherein positions with the same name represent that they have a connection relationship, for example, the main power voltage is connected to the main power supply and the second NPN transistor respectively, and the main power supply and the second NPN transistor are interconnected.

[0082] The main power supply circuit may include: a main power supply, an electrolytic capacitor, a second NPN transistor and a third PMOS transistor.

[0083] The main power supply is used to provide the main power voltage to supply power to the subsequent electrical appliances and electrolytic capacitors.

[0084] The base of the second NPN transistor is connected to the main power supply, the collector of the second NPN transistor is connected to the G pole of the third PMOS tube, and the emitter of the second NPN transistor is grounded. The second NPN transistor is used to be turned on when the main power voltage is greater than the first voltage.

[0085] The D pole of the third PMOS tube is connected to the electrolytic capacitor, and the S pole of the third PMOS tube is connected to the subsequent electrical appliance. The third PMOS tube is used to turn on when the second NPN transistor is turned on, and control the main power supply to provide the main power voltage to the subsequent electrical appliance.

[0086] The second NPN transistor is also used to disconnect when the main power voltage is less than or equal to the first voltage. At this time, the third PMOS transistor is also used to disconnect when the second NPN transistor is disconnected, and control the main power supply to stop providing the main power voltage to the subsequent electrical appliances. Therefore, when the main power voltage is less than or equal to the first voltage, the main power supply circuit can stop supplying power to the subsequent electrical appliances, and instead supply power to the subsequent electrical appliances through the backup power supply circuit.

[0087] It should be noted that since the electrolytic capacitor can store electricity when the main power is supplied, when the main power voltage stops supplying power to the subsequent electrical appliances, the electrolytic capacitor will continue to supply power to the subsequent electrical appliances. At this time, the electricity stored in the electrolytic capacitor is discharged through the main power-off circuit, and the main power supply circuit can therefore stop supplying power to the subsequent electrical appliances.

[0088] It should be noted that Figure 6 The capacitor and resistor in can also be set according to actual needs. Figure 6 The resistance value and voltage division relationship of the middle resistors R1 and R2 can adjust the voltage value of the first voltage.

[0089] The utility model also provides a remote communication module, comprising the above-mentioned main and standby power switching circuit.

[0090] The utility model also provides a car, comprising the above-mentioned remote communication module.

[0091] It should be pointed out that the specific structure of the remote communication module and the automobile is not the focus of protection required by the present invention. The remote communication module and the automobile provided by the present invention include the main power-off circuit and the main-backup power switching circuit described in the above-mentioned specific embodiments; other parts can refer to the prior art and will not be expanded in this article.

[0092] The various embodiments herein are described in a progressive, parallel, or progressive and parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0093] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0094] The main power-off circuit, main-backup power switching circuit, remote communication module and automobile provided by the utility model are introduced in detail above. Specific examples are used in this paper to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A main power-off circuit, characterized in that: The main power-off circuit comprises: a control circuit and a discharge circuit; The control circuit is connected to a port of the microcontroller and to a main power supply circuit; the control circuit is used to perform a logic comparison between a high logic level output by the microcontroller and a main power voltage of the main power supply circuit, and when the main power voltage is less than or equal to a first voltage, the control interface of the control circuit is turned on using the high logic level; The discharge circuit is connected to the control interface and to the electrolytic capacitor in the main power supply circuit; the discharge circuit is used to discharge the electrolytic capacitor when the control interface is turned on.

2. The main power-off circuit according to claim 1, characterized in that: The control circuit comprises: a first diode, a second diode and a first NPN transistor; The anode of the first diode is connected to the main power supply circuit, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the base of the first NPN transistor, the emitter of the first NPN transistor is connected to the port of the microcontroller, and the collector of the first NPN transistor is connected to the control interface; The first diode is used for conducting the main power voltage in a unidirectional manner; The second diode is configured to be turned on when the main power voltage is less than or equal to the first voltage; The first NPN transistor is used to be turned on when the second diode is turned on, and to control the high logic level to turn on the control interface.

3. The main power-off circuit according to claim 1, characterized in that: The discharge circuit comprises: a first PNP transistor; The base of the first PNP transistor is connected to the control interface, the collector of the first PNP transistor is connected to the electrolytic capacitor, and the emitter of the first PNP transistor is grounded; The first PNP transistor is used to turn on when the control interface is turned on, so as to discharge the electrolytic capacitor.

4. A main power switching circuit, characterized in that: The main-backup power switching circuit comprises: a main power off circuit, a backup power supply circuit and a main power supply circuit according to any one of claims 1 to 3; The backup power supply circuit is used to supply power to subsequent electrical appliances when the control interface is turned on; The main power supply circuit is used to supply power to the subsequent electrical appliances and the electrolytic capacitor when the control interface is not conducting.

5. The main power switching circuit according to claim 4, characterized in that: The backup power supply circuit comprises: a backup power supply, a second PNP transistor, a first PMOS transistor and a second PMOS transistor; The base of the second PNP transistor is connected to the control interface, the collector of the second PNP transistor is connected to the G electrode of the first PMOS tube and the G electrode of the second PMOS tube, and the emitter of the second PNP transistor is grounded; the second PNP transistor is used to be turned on when the control interface is turned on; The D pole of the first PMOS tube is connected to the backup power supply, the S pole of the first PMOS tube is connected to the S pole of the second PMOS tube, and the D pole of the second PMOS tube is connected to the subsequent electrical appliance; the first PMOS tube and the second PMOS tube are used to be turned on when the second PNP transistor is turned on, so as to control the backup power supply to provide a backup power voltage to the subsequent electrical appliance.

6. The main power switching circuit according to claim 5, characterized in that: The backup power supply circuit also includes: a backup power boost circuit; The backup power boost circuit is connected to the backup power supply and the D pole of the first PMOS tube; the backup power boost circuit is used to boost the voltage of the backup power supply to obtain the backup power voltage.

7. The main power switching circuit according to claim 4, characterized in that: The main power supply circuit comprises: a main power supply, the electrolytic capacitor, a second NPN transistor and a third PMOS transistor; The main power supply is used to provide a main power voltage to supply power to the subsequent electrical appliances and the electrolytic capacitor; The base of the second NPN transistor is connected to the main power supply, the collector of the second NPN transistor is connected to the G pole of the third PMOS transistor, and the emitter of the second NPN transistor is grounded; the second NPN transistor is used to be turned on when the main power voltage is greater than the first voltage; The D pole of the third PMOS tube is connected to the electrolytic capacitor, and the S pole of the third PMOS tube is connected to the subsequent electrical appliance; the third PMOS tube is used to be turned on when the second NPN transistor is turned on, and control the main power supply to provide the main power voltage to the subsequent electrical appliance.

8. The main power switching circuit according to claim 7, characterized in that: The second NPN transistor is further configured to be disconnected when the main power voltage is less than or equal to the first voltage; The third PMOS transistor is also used to be disconnected when the second NPN transistor is disconnected, and control the main power supply to stop providing the main power voltage to the subsequent electrical appliance.

9. A remote communication module, characterized in that: The remote communication module includes a main-standby power switching circuit as claimed in any one of claims 4 to 8.

10. An automobile, characterized in that: The vehicle comprises the telematics module of claim 9.

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