A control circuit, electronic product and vehicle

Abstract

The application discloses a control circuit, an electronic product and a vehicle, and relates to the field of automobile electronics, and comprises a power supply module, a power supply end of the power supply module is connected with a working power supply, an enabling end is connected with a wake-up output end of a communication module and a first output end of a controller, and an output end is connected with a power supply end of the controller; the communication module, a power supply end of the communication module is connected with the working power supply, and a control end is connected with a first end of a latch circuit; the controller, a second output end of the controller is connected with a second end of the latch circuit; the latch circuit, a second end of the latch circuit is connected with the second output end of the controller. If the controller is reset, a pin is in a high resistance state, at this time, the latch circuit maintains the control signal unchanged and outputs the control signal to the communication module, so that the false shutdown caused by the reset of the controller can be avoided, and the control signal is normally output to the communication module when the controller is in sleep or wake-up, so that the normal sleep and wake-up functions are not affected.

Description

Technical Field

[0001] This utility model relates to the field of automotive electronics, and in particular to a control circuit, electronic product, and vehicle. Background Technology

[0002] In automotive electronics, battery-powered devices often require sleep and wake-up functions to reduce power consumption during non-operational periods. In the design of power modules, communication modules, and controllers, achieving power-down sleep requires the controller and communication module to control the power chip's sleep and wake-up. However, in this design, if the controller resets, its pins become high-impedance, causing the power chip's enable pin to be pulled low. A high enable pin outputs voltage, while a low enable pin shuts off the voltage; therefore, a controller reset causes a power outage, preventing the product from functioning properly. Utility Model Content

[0003] The purpose of this application is to provide a control circuit, electronic product, and vehicle in which, if the controller is reset, the pin is in a high-impedance state. At this time, the control signal of the latching circuit remains unchanged and is output to the communication module, which can avoid accidental shutdown caused by controller reset. When the controller is in sleep or wake-up mode, the control signal is normally output to the communication module without affecting the normal sleep and wake-up functions.

[0004] To solve the above-mentioned technical problems, this application provides a control circuit, including:

[0005] The power supply module has its power supply terminal connected to the working power supply, its enable terminal connected to the wake-up output terminal of the communication module and the first output terminal of the controller, and its output terminal connected to the power supply terminal of the controller, so as to supply power to the controller based on the wake-up signal of the enable terminal.

[0006] The communication module has its power supply terminal connected to the working power supply and its control terminal connected to the first terminal of the latch circuit, so as to wake up the power supply module based on the control signal of the control terminal.

[0007] The controller, wherein the second output terminal of the controller is connected to the second terminal of the latch circuit;

[0008] The latching circuit has its second terminal connected to the second output terminal of the controller. It is used to maintain the control signal unchanged and output it to the communication module when the controller is reset, and to output the control signal to the communication module when the controller is in sleep or wake-up state.

[0009] On the other hand, it also includes the first resistor;

[0010] The first end of the first resistor is connected to the enable terminal of the power module, and the second end of the first resistor is grounded.

[0011] The first resistor is used to control the enable terminal of the power module to a low level when it is not in operation.

[0012] On the other hand, it also includes a first diode;

[0013] The anode of the first diode is connected to the first output terminal of the controller, and the cathode of the first diode is connected to the enable terminal of the power module.

[0014] The first diode is used to prevent backflow of the control signal output by the communication module.

[0015] On the other hand, it also includes a second diode and a second resistor;

[0016] The anode of the second diode is connected to the wake-up output terminal of the communication module, the second terminal of the second diode is connected to the first terminal of the second resistor and the first output terminal of the controller, and the second terminal of the second resistor is connected to the enable terminal of the power module.

[0017] The second diode is used to prevent backflow, and the second resistor is used to limit current.

[0018] On the other hand, the communication module includes a grounding resistor;

[0019] The first end of the grounding resistor is connected to the control terminal, and the second end of the grounding resistor is grounded.

[0020] The grounding resistor is the resistor that keeps the control terminal of the communication module in a low-level state when it is not in operation.

[0021] On the other hand, the latching circuit includes a first switching module and a second switching module;

[0022] The first terminal of the first switch module is connected to the power supply, the second terminal of the first switch module is connected to the control terminal of the communication module, the control terminal of the first switch module is connected to the first terminal of the second switch module, the second terminal of the second switch module is grounded, and the control terminal of the second switch module is connected to the second output terminal of the controller.

[0023] The first switch module is used to turn on when the second switch module is turned on, and the second switch module is used to turn on based on the control signal output by the controller, and to maintain the on state when a high-impedance control signal is output at the second output terminal.

[0024] On the other hand, the first switch module includes a first controllable switch, a third resistor and a fourth resistor, and the second switch module includes a second controllable switch, a fifth resistor and a sixth resistor;

[0025] The first terminal of the first controllable switch is connected to the first terminal of the third resistor and the power supply respectively. The control terminal of the first controllable switch is connected to the second terminal of the third resistor and the first terminal of the fourth resistor. The second terminal of the first controllable switch is connected to the control terminal of the communication module. The second terminal of the fourth resistor is connected to the first terminal of the second controllable switch. The control terminal of the second controllable switch is connected to the first terminal of the fifth resistor and the first terminal of the sixth resistor. The second terminal of the second controllable switch is connected to the second terminal of the sixth resistor. The second terminal of the fifth resistor is connected to the second output terminal of the controller.

[0026] The third resistor is the bias resistor of the first controllable switch, the fourth resistor is the current limiting resistor of the first controllable switch, the fifth resistor is the current limiting resistor of the second controllable switch, and the sixth resistor is the bias resistor of the second controllable switch. The first controllable switch is used to conduct when the second controllable switch is turned on, and the second controllable switch is used to conduct based on the control signal output from the second output terminal, and to maintain the conducting state when a high-impedance control signal is output from the second output terminal.

[0027] On the other hand, the latching circuit also includes a seventh resistor and an eighth resistor. The first end of the seventh resistor, the first end of the eighth resistor and the second end of the first switching module are connected. The second end of the eighth resistor is grounded. The second end of the seventh resistor is connected to the control terminal of the communication module.

[0028] The seventh resistor is used for current limiting, and the eighth resistor is used to control the control terminal of the communication module to a low level when it is not in operation.

[0029] To address the aforementioned technical problems, this application also provides an electronic product, including the aforementioned control circuit.

[0030] To address the aforementioned technical problems, this application also provides a vehicle that includes the aforementioned electronic product.

[0031] This application provides a control circuit, electronic product, and vehicle, relating to the field of automotive electronics. It includes a power module, whose power supply terminal is connected to a working power supply, and whose enable terminal is connected to the wake-up output terminal of a communication module and the first output terminal of a controller, with the output terminal connected to the power supply terminal of the controller; a communication module, whose power supply terminal is connected to a working power supply, and whose control terminal is connected to the first terminal of a latch circuit; a controller, whose second output terminal is connected to the second terminal of the latch circuit; and a latch circuit, whose second terminal is connected to the second output terminal of the controller. If the controller is reset, its pins are in a high-impedance state. At this time, the control signal of the latch circuit remains unchanged and is output to the communication module, which can prevent accidental shutdown due to controller reset. During controller sleep or wake-up, the control signal is normally output to the communication module without affecting normal sleep and wake-up functions. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of a control circuit provided in this application;

[0034] Figure 2 A schematic diagram of a control circuit provided for the prior art;

[0035] Figure 3 A schematic diagram of another control circuit provided in this application. Detailed Implementation

[0036] The core of this application is to provide a control circuit, electronic product, and vehicle. If the controller is reset, the pin is in a high-impedance state. At this time, the control signal of the latching circuit remains unchanged and is output to the communication module, which can avoid accidental shutdown caused by controller reset. When the controller is in sleep or wake-up, the control signal is normally output to the communication module without affecting the normal sleep and wake-up functions.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Figure 1A schematic diagram of a control circuit provided in this application is shown. The control circuit includes:

[0039] Power module 1, the power supply terminal of power module 1 is connected to the working power supply, the enable terminal is connected to the wake-up output terminal of communication module 2 and the first output terminal of controller 3, and the output terminal is connected to the power supply terminal of controller 3 so as to supply power to controller 3 based on the wake-up signal of enable terminal;

[0040] Communication module 2, the power supply terminal of communication module 2 is connected to the working power supply, and the control terminal is connected to the first terminal of latch circuit 4 so as to wake up power module 1 based on the control signal of the control terminal;

[0041] Controller 3, the second output terminal of controller 3 is connected to the second terminal of latch circuit 4;

[0042] The latch circuit 4 has its second terminal connected to the second output terminal of the controller 3. It is used to maintain the control signal unchanged and output it to the communication module 2 when the controller 3 is reset, and to output the control signal to the communication module 2 when the controller 3 is in sleep or wake-up.

[0043] Figure 2 A schematic diagram of a control circuit provided for the prior art;

[0044] In the diagram, IO1 is the first output terminal of controller 3, IO2 is the second output terminal of controller 3, EN is the enable terminal of power module 1, INH is the wake-up output terminal of communication module 2, and SLP is the control terminal of communication module 2.

[0045] During normal operation, the wake-up sequence is: communication module 2 → power module 1 → controller 3, and the working sequence is: power module 1 → controller 3 → communication module 2.

[0046] In the prior art, during wake-up, the communication module 2 is woken up first, then controls the enable terminal of the power module 1, and then the power module 1 supplies power to the controller 3, and then the controller 3 controls the communication module 2 to work through the second output terminal.

[0047] Power-on state: Power module 1 and communication module 2 are powered on, the wake-up output terminal of communication module 2 outputs a high level, the enable terminal of power module 1 is pulled high, and power module 1 and communication module 2 enter normal mode.

[0048] Operating status (before and after reset): The first and second output terminals are set high by the controller 3, and the power module 1 and communication module 2 are in working mode.

[0049] Operating state (when reset): The first and second output terminals are in a high impedance state, which will cause the enable terminal of power module 1 to be pulled low, causing a power outage and preventing the product from working properly.

[0050] Sleep mode: The first and second output terminals are actively set low by the controller 3, the control terminal is pulled low, the communication module 2 enters sleep mode, the wake-up output terminal is in a floating state, at the same time, the enable terminal is pulled low, the power module 1 output is turned off, there is no Vcc, and the circuit is in a power-off sleep mode.

[0051] The problem is that when controller 3 is reset during operation, it will cause a power outage, resulting in an unexpected power outage for the product.

[0052] like Figure 1 As shown, this application adds a latch circuit 4, with the first and second output terminals in a high-impedance state. At this time, the first output terminal floats, and the second output terminal is pulled high by the latch circuit 4. The communication module 2 remains in working mode, the wake-up output terminal outputs a high level, the enable terminal is pulled high, and the power module 1 is in normal mode. By latching the control signal, unexpected power loss is overcome. This application only adds a latch circuit and does not improve the normal operating state of the power module 1, communication module 2, and controller 3.

[0053] The battery provides power to the power module 1 and communication module 2. Other power sources can also be used, and this application does not impose further limitations on their use. Vcc is the output voltage of the power module 1, which is also the operating voltage of the controller 3. The power module 1 provides the operating voltage; pulling down or pulling up the enable pin of the power module 1 can turn the Vcc output on or off. The communication module 2 is used for communication between different products. The wake-up output of the communication module 2 is high when the communication module 2 is powered on, working, or in standby mode; it is floating in sleep mode, used to control the state of the enable pin of the power module 1. The control pin of the communication module 2 can be pulled low by an external level to control the communication module 2 into sleep mode. The controller 3 can enter sleep mode by pulling down its first and second output pins. During reset, the first and second output pins of the controller 3 are in a high-impedance state.

[0054] This application provides a control circuit relating to the field of automotive electronics, including a power module 1. The power supply terminal of the power module 1 is connected to the operating power supply, and the enable terminal is connected to the wake-up output terminal of the communication module 2 and the first output terminal of the controller 3. The output terminal is connected to the power supply terminal of the controller 3. A communication module 2 has its power supply terminal connected to the operating power supply, and its control terminal connected to the first terminal of a latch circuit 4. A controller 3 has its second output terminal connected to the second terminal of the latch circuit 4. The latch circuit 4 has its second terminal connected to the second output terminal of the controller 3. If the controller 3 is reset, its pins are in a high-impedance state. At this time, the control signal of the latch circuit 4 remains unchanged and is output to the communication module 2, which can prevent accidental shutdown caused by the controller 3 being reset. When the controller 3 is in sleep or wake-up mode, it normally outputs control signals to the communication module 2 without affecting the normal sleep and wake-up functions.

[0055] Based on the above embodiments:

[0056] In some embodiments, a first resistor R1 is also included;

[0057] The first end of the first resistor R1 is connected to the enable terminal of the power module 1, and the second end of the first resistor R1 is grounded.

[0058] The first resistor R1 is used to keep the enable terminal of power module 1 at a low level when it is not in operation.

[0059] To ensure that the enable pin of power module 1 remains at a stable low level when it is not actively driven, a first resistor R1 is set as a pull-down resistor to provide a low level.

[0060] In some embodiments, a first diode D1 is also included;

[0061] The anode of the first diode D1 is connected to the first output terminal of the controller 3, and the cathode of the first diode D1 is connected to the enable terminal of the power module 1.

[0062] The first diode D1 is used to prevent backflow of control signals output from the communication module.

[0063] The function of the first diode D1 is to prevent backflow, preventing the output voltage of the wake-up output terminal of the communication module 2 from flowing back and damaging the controller 3.

[0064] In some embodiments, a second diode D2 and a second resistor R2 are also included;

[0065] The anode of the second diode D2 is connected to the wake-up output terminal of the communication module 2, the second terminal of the second diode D2 is connected to the first terminal of the second resistor R2 and the first output terminal of the controller 3, and the second terminal of the second resistor R2 is connected to the enable terminal of the power module 1.

[0066] The second diode D2 is used to prevent backflow, and the second resistor R2 is used to limit current.

[0067] The second resistor R2 is the enable resistor for the first output terminal control enable terminal, and the second diode D2 is to prevent current from flowing from the power module 1 or controller 3 to the communication module 2.

[0068] In some embodiments, the communication module 2 includes a grounding resistor R9;

[0069] The first end of the grounding resistor R9 is connected to the control terminal, and the second end of the grounding resistor R9 is grounded.

[0070] The grounding resistor R9 is used to keep the control terminal of the communication module 2 at a low level when it is not in operation.

[0071] The grounding resistor R9 is an internal pull-down resistor of the communication module 2, which ensures that the control terminal of the communication module 2 maintains a stable low level when it is not actively driven.

[0072] In some embodiments, the latching circuit 4 includes a first switching module and a second switching module;

[0073] The first terminal of the first switch module is connected to the power supply, the second terminal of the first switch module is connected to the control terminal of the communication module 2, the control terminal of the first switch module is connected to the first terminal of the second switch module, the second terminal of the second switch module is grounded, and the control terminal of the second switch module is connected to the second output terminal of the controller 3.

[0074] The first switch module is used to turn on when the second switch module is turned on. The second switch module is used to turn on based on the control signal output by the controller 3, and maintains the on state when a high-impedance control signal is output at the second output terminal.

[0075] In some embodiments, the first switch module includes a first controllable switch T1, a third resistor R3 and a fourth resistor R4, and the second switch module includes a second controllable switch T2, a fifth resistor R5 and a sixth resistor R6.

[0076] The first terminal of the first controllable switch T1 is connected to the first terminal of the third resistor R3 and the power supply. The control terminal of the first controllable switch T1 is connected to the second terminal of the third resistor and the first terminal of the fourth resistor R4. The second terminal of the first controllable switch T1 is connected to the control terminal of the communication module 2. The second terminal of the fourth resistor R4 is connected to the first terminal of the second controllable switch T2. The control terminal of the second controllable switch T2 is connected to the first terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6. The second terminal of the second controllable switch T2 is connected to the second terminal of the sixth resistor R6. The second terminal of the fifth resistor R5 is connected to the second output terminal of the controller 3.

[0077] The third resistor R3 is the bias resistor of the first controllable switch T1, the fourth resistor R4 is the current limiting resistor of the first controllable switch T1, the fifth resistor R5 is the current limiting resistor of the second controllable switch T2, and the sixth resistor R6 is the bias resistor of the second controllable switch T2. The first controllable switch T1 is used to conduct when the second controllable switch T2 is turned on, and the second controllable switch T2 is used to conduct based on the control signal output from the second output terminal, and maintains the conducting state when a high-impedance control signal is output from the second output terminal.

[0078] It should be noted that both the first controllable switch T1 and the second controllable switch T2 are transistors.

[0079] 1. Power-on state: Power module 1 and communication module 2 are powered on. The wake-up output terminal of communication module 2 outputs a high level VINH=VBAT. The enable terminal of power module 1 is pulled up to a high level through the second diode D2 and the second resistor R2. Power module 1 outputs voltage Vcc.

[0080] 2. Operating Status (Before and After Reset): The first and second output terminals of controller 3 are set high by controller 3 to ensure that the enable terminal of power module 1 and the wake-up output terminal of communication module 2 are at a stable high level, and communication module 2 enters normal mode. Simultaneously, due to the high output terminal of controller 3, the second controllable switch T2 is opened through the fifth resistor R5 and the sixth resistor R6. Next, a loop is formed between the third resistor R3, the fourth resistor R4, and the second controllable switch T2, opening the first controllable switch T1, and pulling the seventh resistor R7 up to Vcc. The control terminal of communication module 2 is simultaneously pulled high by Vcc and the second output terminal of controller 3 through the seventh resistor R7, placing communication module 2 in normal mode, and the wake-up output terminal of communication module 2 is at a high level. The enable terminal of power module 1 is pulled high by the first and second output terminals of controller 3, placing power module 1 in normal mode.

[0081] 3. Operating State (Reset): The first and second outputs of controller 3 are in a high-impedance state, and the second output of controller 3 itself does not output a high level. However, the second output of controller 3 is pulled high before the reset, that is, the first controllable switch T1 and the second controllable switch T2 are in the open state. The control terminal of communication module 2 is pulled high by Vcc, and the second output of controller 3 is also pulled high at the same time. Therefore, the transistors of latch circuit 4, the first controllable switch T1 and the second controllable switch T2, will not be turned off due to the high impedance of the second output of controller 3, and will remain in the open state. The control terminal of communication module 2 maintains a high level. The entire circuit is in an interlocked state. At this time, communication module 2 is still in the working mode, the wake-up output of communication module 2 outputs a high level, the enable terminal of power module 1 is still pulled high, and power module 1 is in the normal mode.

[0082] 4. Sleep mode: The first output terminal and the second output terminal of the controller 3 are actively pulled low by the controller 3. Then the second controllable switch T2 is turned off, the first controllable switch T1 is turned off, the control terminal of the communication module 2 is pulled low, the communication module 2 enters sleep mode, and the wake-up output terminal of the communication module 2 is in a floating state. At the same time, the enable terminal of the power module 1 is pulled low by the first output terminal of the controller 3, the output of the power module 1 is turned off, there is no Vcc, and it is in a power-off sleep mode.

[0083] 5. Wake-up state: When communication module 2 receives an external wake-up signal, it enters standby mode. The wake-up output terminal of communication module 2 outputs a high level, the enable terminal of power module 1 is pulled high again, power module 1 outputs Vcc, and controller 3 is powered on, which causes communication module 2 to enter working mode by pulling the control terminal of communication module 2 high.

[0084] In some embodiments, the latching circuit 4 further includes a seventh resistor R7 and an eighth resistor R8. The first end of the seventh resistor R7, the first end of the eighth resistor R8 and the second end of the first switch module are connected, the second end of the eighth resistor R8 is grounded, and the second end of the seventh resistor R7 is connected to the control end of the communication module 2.

[0085] The seventh resistor R7 is used for current limiting, and the eighth resistor R8 is used to keep the control terminal of the communication module 2 at a low level when it is not in operation.

[0086] The seventh resistor R7 is the enable resistor for the control terminal of the second output terminal, which controls the control terminal of the communication module 2. The eighth resistor R8 is a pull-down resistor, which ensures that the control terminal of the communication module 2 maintains a stable low level when it is not actively driven.

[0087] This application also provides an electronic product including the control circuit described above.

[0088] The description of the electronic products provided in this application is based on the above embodiments and will not be repeated here.

[0089] This application also provides a vehicle that includes the aforementioned electronic products.

[0090] Please refer to the above embodiments for a description of the vehicle provided in this application; it will not be repeated here.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0092] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0093] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control circuit, characterized by include: The power supply module has its power supply terminal connected to the working power supply, its enable terminal connected to the wake-up output terminal of the communication module and the first output terminal of the controller, and its output terminal connected to the power supply terminal of the controller, so as to supply power to the controller based on the wake-up signal of the enable terminal. The communication module has its power supply terminal connected to the working power supply and its control terminal connected to the first terminal of the latch circuit, so as to wake up the power supply module based on the control signal of the control terminal. The controller, wherein the second output terminal of the controller is connected to the second terminal of the latch circuit; The latching circuit has its second terminal connected to the second output terminal of the controller. It is used to maintain the control signal unchanged and output it to the communication module when the controller is reset, and to output the control signal to the communication module when the controller is in sleep or wake-up state.

2. The control circuit of claim 1, wherein, It also includes the first resistor; The first end of the first resistor is connected to the enable terminal of the power module, and the second end of the first resistor is grounded. The first resistor is a resistor that controls the enable terminal of the power module to be in a low-level state when it is not in operation.

3. The control circuit of claim 1, wherein, It also includes a first diode; The anode of the first diode is connected to the first output terminal of the controller, and the cathode of the first diode is connected to the enable terminal of the power module. The first diode is used to prevent backflow of the control signal output by the communication module.

4. The control circuit of claim 1, wherein, It also includes a second diode and a second resistor; The anode of the second diode is connected to the wake-up output terminal of the communication module, the second terminal of the second diode is connected to the first terminal of the second resistor and the first output terminal of the controller, and the second terminal of the second resistor is connected to the enable terminal of the power module. The second diode is used to prevent backflow, and the second resistor is used to limit current.

5. The control circuit of claim 1, wherein, The communication module includes a grounding resistor; The first end of the grounding resistor is connected to the control terminal, and the second end of the grounding resistor is grounded. The grounding resistor is the resistor that keeps the control terminal of the communication module in a low-level state when it is not in operation.

6. The control circuit of any one of claims 1 to 5, wherein, The latching circuit includes a first switching module and a second switching module; The first terminal of the first switch module is connected to the power supply, the second terminal of the first switch module is connected to the control terminal of the communication module, the control terminal of the first switch module is connected to the first terminal of the second switch module, the second terminal of the second switch module is grounded, and the control terminal of the second switch module is connected to the second output terminal of the controller. The first switch module is used to turn on when the second switch module is turned on, and the second switch module is used to turn on based on the control signal output by the controller, and maintain the on state when a high-impedance control signal is output at the second output terminal.

7. The control circuit of claim 6, wherein, The first switch module includes a first controllable switch, a third resistor, and a fourth resistor; the second switch module includes a second controllable switch, a fifth resistor, and a sixth resistor. The first terminal of the first controllable switch is connected to the first terminal of the third resistor and the power supply respectively. The control terminal of the first controllable switch is connected to the second terminal of the third resistor and the first terminal of the fourth resistor. The second terminal of the first controllable switch is connected to the control terminal of the communication module. The second terminal of the fourth resistor is connected to the first terminal of the second controllable switch. The control terminal of the second controllable switch is connected to the first terminal of the fifth resistor and the first terminal of the sixth resistor. The second terminal of the second controllable switch is connected to the second terminal of the sixth resistor. The second terminal of the fifth resistor is connected to the second output terminal of the controller. The third resistor is the bias resistor of the first controllable switch, the fourth resistor is the current limiting resistor of the first controllable switch, the fifth resistor is the current limiting resistor of the second controllable switch, and the sixth resistor is the bias resistor of the second controllable switch. The first controllable switch is used to conduct when the second controllable switch is turned on, and the second controllable switch is used to conduct based on the control signal output from the second output terminal, and to maintain the conducting state when a high-impedance control signal is output from the second output terminal.

8. The control circuit of claim 6, wherein, The latching circuit further includes a seventh resistor and an eighth resistor. The first end of the seventh resistor, the first end of the eighth resistor, and the second end of the first switching module are connected. The second end of the eighth resistor is grounded. The second end of the seventh resistor is connected to the control terminal of the communication module. The seventh resistor is used for current limiting, and the eighth resistor is used to control the control terminal of the communication module to a low level when it is not in operation.

9. An electronic product, characterized by comprising: Includes the control circuit as described in any one of claims 1 to 8.

10. A vehicle characterized by comprising: Including the electronic products as described in claim 9.

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