Power supply circuit, vehicle-mounted wireless terminal and vehicle

Abstract

The utility model provides a power supply circuit, which is applied to a vehicle-mounted wireless terminal and comprises a first power supply module, a second power supply module, a first switch module, a second switch module, a power supply buffer module and an output module, the first power supply module, the first switch module and the output module are connected in sequence, the second power supply module, the second switch module and the output module are connected in sequence, and the power supply buffer module and the second switch module are arranged in parallel; in the switching process of the first switch module and the second switch module, the power supply buffer module conducts the second power supply module and the output module. Smooth switching of the first switch module and the second switch module is facilitated, so that the power supply circuit meets the power supply requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a power supply circuit, a vehicle-mounted wireless terminal and a vehicle. Background Art

[0002] Currently, the power supply circuit for a T-BOX (Telematics control box, an in-vehicle wireless terminal) consists of a main power supply and a backup power supply. When the main power supply's output voltage falls below a preset voltage, the backup power supply is enabled, completing the switchover between the main and backup power sources. However, the current power supply circuit takes a considerable amount of time to switch from the main power supply to the backup power supply when the backup power supply is enabled, making it difficult for the current power supply circuit to meet the power supply requirements of the T-BOX. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a power supply circuit, a vehicle-mounted wireless terminal and a vehicle, so as to solve the problem that the power supply circuit of the T-BOX cannot meet the power supply demand.

[0004] Based on the above purpose, the utility model provides a power supply circuit, including a first power supply module, a second power supply module, a first switch module, a second switch module, a power supply buffer module and an output module;

[0005] The first power supply module, the first switch module and the output module are connected in sequence, the second power supply module, the second switch module and the output module are connected in sequence, and the power supply buffer module is arranged in parallel with the second switch module;

[0006] During the switching process between the first switch module and the second switch module, the power supply buffer module conducts power between the second power supply module and the output module.

[0007] Furthermore, the control end of the first switch module is connected to the power supply monitoring end of the first power supply module, and the control end of the second switch module is connected to the power supply output end of the first power supply module;

[0008] When the signal from the power supply monitoring terminal is abnormal, the first switch module is turned off, and the power supply buffer module conducts between the second power supply module and the output module;

[0009] When the signal of the power supply output end is abnormal, the second switch module switches on the second power supply module and the output module, and the power supply buffer module switches off;

[0010] Wherein, in the transmission direction of the electrical signal, the power supply monitoring end is located before the power supply output end.

[0011] Further, the power supply buffer module comprises a diode, an anode of the diode is connected with the second power supply module, and a cathode of the diode is connected with the output module.

[0012] Further, the first power supply module comprises a first power supply, a first power supply monitoring module and a first power supply processing module, the first power supply is connected with the first power supply processing module, an input end of the first power supply monitoring module is connected with an output end of the first power supply, an output end of the first power supply monitoring module is connected with an enable end of the first power supply processing module and the power supply monitoring end, and an output end of the first power supply processing module is connected with the power supply output end.

[0013] Further, the second power supply module comprises a second power supply, a second power supply monitoring module and a second power supply processing module, the second power supply is connected with the second power supply processing module, an input end of the second power supply monitoring module is connected with an output end of the second power supply, and an output end of the second power supply monitoring module is connected with an enable end of the second power supply processing module.

[0014] Further, the output end of the second power supply monitoring module is further connected with a vehicle controller.

[0015] Further, the first switch module comprises two first MOS tubes arranged in parallel, and the gates of the two first MOS tubes are connected with the control end of the first switch module.

[0016] Further, the second switch module comprises two second MOS tubes arranged in parallel, and the gates of the two second MOS tubes are connected with the control end of the second switch module.

[0017] Based on the same inventive concept, the application further provides a vehicle-mounted wireless terminal comprising the power supply circuit.

[0018] Based on the same inventive concept, the application further provides a vehicle comprising the vehicle-mounted wireless terminal.

[0019] As can be seen from the above, the power supply circuit provided by the application can conduct the second power supply module and the output module in the switching process of the first switch module and the second switch module, so that the second power supply module supplies power to the output module, avoids the situation that the output module has no current input in the switching process of the first switch module and the second switch module of the power supply switching module, and influences the normal operation of the output module, and is conducive to the smooth switching of the first switch module and the second switch module, so that the power supply circuit meets the power supply demand, and the switching of the first switch module and the second switch module does not need the control of the controller, which is conducive to improving the reliability of the power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 Schematic diagram of power supply circuit for the embodiment of the present application Figure 1 ;

[0022] Figure 2 Schematic diagram of power supply circuit for the embodiment of the present application Figure 2 ;

[0023] Figure 3 Schematic diagram of power supply circuit for the embodiment of the present application Figure 3 ;

[0024] Figure 4 Schematic diagram of power supply circuit for the embodiment of the present application Figure 4 .

[0025] In the figure: 10, first power supply module; 11, power supply monitoring end; 12, power supply output end; 13, first power supply; 14, first power supply monitoring module; 15, first power supply processing module; 151, enable end of the first power supply processing module; 20, second power supply module; 21, second power supply; 22, second power supply monitoring module; 23, second power supply processing module; 231, enable end of the second power supply processing module; 30, first switch module; 31, control end of the first switch module; 32, first MOS tube; 40, second switch module; 41, control end of the second switch module; 42, second MOS tube; 50, power supply buffer module; 51, diode; 60, output module; 70, vehicle controller. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will further describe the present application in combination with specific embodiments and with reference to the drawings.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0028] With the continuous evolution of vehicle intelligence, T-BOX has become a standard feature. Currently, T-BOX offers services such as remote control, FOTA (Firmware Over-the-Air), B-CALL (Breakdown Call), E-CALL (Emergency Call), data upload, and download. A safe and efficient power supply circuit is crucial to ensure seamless power transfer to the backup battery after a power outage, ensuring that the T-BOX can continue to operate normally for a period of time, enabling emergency calls and uploading vehicle status information, even after an accident or system failure.

[0029] As described in the background art, when the backup power supply is enabled, it takes a certain amount of time for the current power supply circuit to switch from the main power supply to the backup power supply, which makes it difficult for the current power supply circuit to meet the power supply requirements of the T-BOX.

[0030] However, in the related art, switching between the main power supply and the backup power supply requires an additional comparator, which is costly and requires an MCU for control after comparison, resulting in low reliability.

[0031] Based on this, the present application proposes a power supply circuit, an on-board wireless terminal and a vehicle to solve the problem that the existing power supply circuit is difficult to achieve smooth switching between the main power supply and the backup power supply, so that the power supply circuit can continue to supply power during the switching process between the main power supply and the backup power supply to meet the power supply needs of the T-BOX.

[0032] The present application is described in detail below through one or more specific embodiments.

[0033] The present application provides a power supply circuit, such as Figure 1As shown, the power supply circuit comprises a first power supply module 10, a second power supply module 20, a first switch module 30, a second switch module 40, a power supply buffer module 50 and an output module 60.

[0034] The first power supply module 10, the first switch module 30 and the output module 60 are sequentially connected, the second power supply module 20, the second switch module 40 and the output module 60 are sequentially connected, and the power supply buffer module 50 is connected in parallel with the second switch module 40.

[0035] During the switching process of the first switch module 30 and the second switch module 40, the power supply buffer module 50 turns on the second power supply module 20 and the output module 60.

[0036] Specifically, the first switch module 30 is used to turn on the first power supply module 10 and the output module 60, and the second switch module 40 is used to turn on the second power supply module 20 and the output module 60. When the first switch module 30 is turned on, the second switch module 40 is switched off, and when the first switch module 30 is turned off, the second switch module 40 is switched on, which can effectively prevent the voltage of the first power supply module 10 from flowing back into the second power supply module 20 when the first power supply module 10 and the output module 60 are turned on.

[0037] When the first switch module 30 is turned off, the second switch module 40 recognizes that the first switch module 30 is turned off and switches its own state to on. However, this operation process requires time, resulting in a period of time when the first switch module 30 and the second switch module 40 are both turned off, and thus the power supply circuit has no power output, and the power supply demand of the T-BOX cannot be met.

[0038] The power supply buffer module 50 can compensate for the power supply during the period when the first switch module 30 and the second switch module 40 are both turned off, so that the power supply circuit can continuously maintain power output and meet the power supply demand of the T-BOX.

[0039] Specifically, the first power supply module 10 is a main power supply module, the second power supply module 20 is a backup power supply module, the power supply buffer module 50 is arranged in parallel with the second switch module 40, and the second power supply module 20 and the output module 60 are turned on in the period of switching of the first switch module 30 and the second switch module 40, so that the conduction effectiveness of the power supply buffer module 50 can be ensured. Since the second power supply module 20 is a backup power supply module, the second power supply module 20 and the output module 60 are turned on only when the first power supply module 10 cannot supply power due to abnormality (such as power depletion or damage), and the power supply buffer module 50 is arranged to enable the second power supply module 20 to supply power in advance to meet the power supply demand of the period T-BOX of switching of the first switch module 30 and the second switch module 40.

[0040] On this basis, when the first power supply module 10 resumes power supply, the second switch module 40 is turned off and the first switch module 30 is turned on. In this process, the power supply buffer module 50 can still ensure smooth switching of the first switch module 30 and the second switch module 40, so that the power supply circuit can continuously maintain power output to meet the power supply demand of T-BOX.

[0041] In the embodiment, the power supply buffer module 50 is arranged to turn on the second power supply module 20 and the output module 60 in the switching process of the first switch module 30 and the second switch module 40, so that the second power supply module 20 supplies power to the output module 60, avoids the situation that the output module 60 has no current input in the switching process of the first switch module 30 and the second switch module 40 of the power supply switching module, and affects the normal operation of the output module 60. This is conducive to smooth switching of the first switch module 30 and the second switch module 40, so that the power supply circuit meets the power supply demand, and the switching of the first switch module 30 and the second switch module 40 does not need to be controlled by the controller, which is conducive to improving the reliability of the power supply circuit.

[0042] The above embodiment describes that the power supply buffer module 50 is used to be turned on in the switching process of the first switch module 30 and the second switch module 40, so as to avoid the situation that the output module 60 has no input. The specific switching process of the first switch module 30 and the second switch module 20 is described below to limit the correlation of the switching process of the first switch module 30 and the second switch module 20.

[0043] In some embodiments, as Figure 2As shown, the control end 31 of the first switch module 30 is connected with the power supply monitoring end 11 of the first power supply module 10, and the control end 41 of the second switch module 40 is connected with the power supply output end 12 of the first power supply module 10.

[0044] When the signal of the power supply monitoring end 11 is abnormal, the first switch module 30 is turned off, and the power supply buffer module 50 turns on the second power supply module 20 and the output module 60.

[0045] When the signal of the power supply output end 12 is abnormal, the second switch module 40 turns on the second power supply module 20 and the output module 60, and the power supply buffer module 50 is turned off.

[0046] In the transmission direction of the electrical signal, the power supply monitoring end 11 is located before the power supply output end 12.

[0047] Specifically, the control end 31 of the first switch module 30 is connected with the power supply monitoring end 11 of the first power supply module 10, and when the power supply of the first power supply module 10 changes, the off or on state of the first switch module 30 is switched accordingly. The control end 41 of the second switch module 40 is connected with the power supply output end 12 of the first power supply module 10, and when the power supply of the first power supply module 10 changes, the power supply output end 12 of the first power supply module 10 will change accordingly. Correspondingly, the off or on state of the second switch module 40 will be switched, and will not be immediately switched according to the power supply of the first power supply module 10. That is, in the transmission direction of the electrical signal, the power supply monitoring end 11 is located before the power supply output end 12, the state switching of the first switch module 30 is located before the state switching of the second switch module 40, resulting in that the switching between the first switch module 30 and the second switch module 40 is in the off state.

[0048] On this basis, the power supply buffer module 50 is provided, which can turn on the second power supply module 20 and the output module 60 in time when the first switch module 30 is turned off, realize the power supply of the power supply circuit, and turn off the on state of the second power supply module 20 and the output module 60 when the second switch module 40 is turned on, so that the second switch module 40 turns on the second power supply module 20 and the output module 60, buffers the power supply during the state switching of the first switch module 30 and the second switch module 40, and ensures that the power supply circuit can continuously output the circuit.

[0049] In the embodiment, the control end 31 of the first switch module 30 and the control end 41 of the second switch module 40 are respectively connected with different ports of the first power supply module 10, so that the state switching of the first switch module 30 and the second switch module 40 has a time difference, avoiding the simultaneous state switching of the first switch module 30 and the second switch module 40, resulting in the shortening of the reaction time of the power supply buffer module 50, and further resulting in the instability of the power supply circuit. The power supply buffer module 50 can turn on the second power supply module 20 and the output module 60 in time based on the state change of the first switch module 30, so that the power supply circuit can continuously exist power output, meet the power supply demand, and turn off the second switch module 40 and the output module 60 in time after the state switching of the second switch module 40 is turned on, to ensure the stable operation of the power supply circuit, play a role in ensuring the smooth switching of the first switch module 30 and the second switch module 40, and be beneficial to the practicability and popularization of the power supply circuit.

[0050] The above embodiment describes the specific switching process of the first switch module 30 and the second switch module 40, and the power supply buffer module 50 can be turned on during the switching process of the first switch module 30 and the second switch module 40. The specific structure of the power supply buffer module 50 is described below to clarify the function implementation process of the power supply buffer module 50.

[0051] In some embodiments, as shown in Figure 3 The power supply buffer module 50 includes a diode 51, the anode of the diode 51 is connected with the second power supply module 20, and the cathode of the diode 51 is connected with the output module 60.

[0052] Specifically, the diode 51 can be turned on when there is a pressure difference between its anode and cathode, and be turned off when there is a negative pressure difference. The second power supply module 20 has a voltage, and when the voltage difference between the output module 60 and the second power supply module 20 exceeds a threshold value (such as 1V), the diode 51 is turned on, that is, the second power supply module 20 and the output module 60 are turned on. When the voltage difference between the output module 60 and the second power supply module 20 is less than the threshold value (that is, when the first switch module 30 is turned on or the second switch module 40 is turned on), the diode 51 is turned off.

[0053] It should be noted that the output voltages of the first power supply module 10 and the second power supply module 20 are equal. When the first switch module 30 is turned on, the voltage of the output module 60 is the output voltage of the first power supply module 10. When the second switch module 40 is turned on, the voltage of the output module 60 is the output voltage of the second power supply module 20. The diode 51 has resistance. When it turns on the second power supply module 20 and the output module 60, the voltage of the output module 60 will be lower than the output voltage of the second power supply module 20, so that the diode 51 remains in the on state.

[0054] In this embodiment, the power supply buffer module 50 is provided with the diode 51, which can not only play the power supply buffering role of the power supply buffer module 50, but also reduce the cost of the power supply buffer module 50 compared with the prior art in which a comparator is provided in the power supply buffer module 50, thereby reducing the cost of the power supply circuit, which is beneficial to the practicality and application promotion of the power supply circuit.

[0055] The above embodiment clarifies the connection relationship and structure of the power supply buffer module 50. The specific structure and connection relationship of the first power supply module 10 and the second power supply module 20 are described below to limit the power supply function implementation of the first power supply module 10 and the second power supply module 20.

[0056] In some embodiments, as Figure 4 As shown, the first power supply module 10 includes a first power supply 13, a first power supply monitoring module 14 and a first power supply processing module 15, the first power supply 13 and the first power supply processing module 15 are connected, the input end of the first power supply monitoring module 14 is connected to the output end of the first power supply 13, the output end of the first power supply monitoring module 14 is connected to the enable end 151 of the first power supply processing module 15 and the power supply monitoring end 11, and the output end of the first power supply processing module 15 is connected to the power supply output end 12.

[0057] Specifically, the first power supply 13 is the power supply of the first power supply module 10, which is used to output voltage. The first power supply monitoring module 14 is used to monitor the output voltage of the first power supply 13, and control whether the first power supply processing module 15 is running or not according to the output voltage of the first power supply 13, that is, control whether the first power supply processing module 15 outputs voltage, and is connected to the power supply monitoring end 11 of the first power supply module 10 to control the shutdown or conduction of the first switch module 30, so that the first switch module 30 can switch its own state according to the state of the first power supply 13.

[0058] The output end of the first power supply processing module 15 is connected to the power supply output end 12 of the first power supply module 10, and the output end of the first power supply module 10 is connected to the control end 41 of the second switch module 40, that is, the output status of the first power supply processing module 15 is related to the shutdown or conduction of the second switch module 40, and in the transmission direction of the electrical signal, the output end of the first power supply monitoring module 14 is located before the output end of the first power supply processing module 15, that is, the power supply monitoring end 11 of the first power supply module 10 is located before the power supply output end 12.

[0059] The first power supply processing module 15 is used to receive the voltage of the first power supply 13 and process and transmit the voltage of the first power supply 13, that is, to process the voltage of the first power supply 13 for use by subsequent power-consuming modules (such as T-BOX).

[0060] Exemplarily, the first power supply 13 is a battery, the first power supply monitoring module 14 is a monitoring chip, and the first power supply processing module 15 is a DCDC (DC-to-DC converter). The output voltage of the battery is 12V, and the output voltage of the DCDC is 4V. The monitoring chip monitors the output voltage of the battery. When the output voltage of the battery is lower than the threshold voltage (such as 5V), the monitoring chip outputs a low level. The control end 31 of the first switch module 30 controls the first switch module 30 to turn off based on the low-level signal received from the monitoring chip. The enable end of the DCDC disables the DCDC based on the received low-level signal, and the DCDC does not output voltage. When the output voltage of the battery is higher than or equal to the threshold voltage (such as 5V), the monitoring chip outputs a high level. The control end 31 of the first switch module 30 controls the first switch module 30 to turn on based on the received high-level signal. The enable end of the DCDC enables the DCDC based on the received high-level signal, and the DCDC outputs voltage.

[0061] In this embodiment, the input end of the first power supply monitoring module 14 is connected to the output end of the first power supply 13 to monitor the output voltage of the first power supply 13, and the output end of the first power supply monitoring module 14 is connected to the enable end 151 of the first power supply processing module 15 and the power supply monitoring end 11 to control the state of the first power supply processing module 15 and the first switch module 30 connected to the power supply monitoring end 11 according to the output voltage of the first power supply 13, thereby achieving the purpose of monitoring the first power supply module 10, avoiding the first power supply module 10 from continuing to output when the voltage of the first power supply 13 is reduced, resulting in unstable output voltage, affecting the normal operation of subsequent electrical equipment, and thus facilitating the stable operation of the first power supply module 10.

[0062] In some embodiments, as Figure 4 As shown, the second power supply module 20 includes a second power supply 21, a second power supply monitoring module 22 and a second power supply processing module 23. The second power supply 21 and the second power supply processing module 23 are connected, the input end of the second power supply monitoring module 22 is connected to the output end of the second power supply 21, and the output end of the second power supply monitoring module 22 is connected to the enable end 231 of the second power supply processing module 23.

[0063] Specifically, the second power supply 21 is the power supply of the second power supply module 20, which is used to output voltage. The second power supply monitoring module 22 is used to monitor the output voltage of the second power supply 21 and control whether the second power supply processing module 23 is running or not according to the output voltage of the second power supply 21, that is, control whether the second power supply processing module 23 outputs voltage.

[0064] The second power supply processing module 23 is used to receive the voltage of the second power supply 21 and process and transmit the voltage of the second power supply 21, that is, to process the voltage of the second power supply 21 for use by subsequent power-consuming modules (such as T-BOX).

[0065] Exemplarily, the second power supply 21 is a backup battery pack, the second power supply monitoring module 22 is a monitoring chip, the second power supply processing module 23 is a DCDC, the output voltage of the backup battery pack is 5V, the output voltage of the DCDC is 4V, and the monitoring chip monitors the output voltage of the backup battery pack. When the output voltage of the backup battery pack is lower than the threshold voltage (such as 3.6V), the monitoring chip outputs a low-level signal, and the enable end of the DCDC disables the DCDC based on the received low-level signal, and the DCDC does not output voltage; when the output voltage of the backup battery pack is higher than or equal to the threshold voltage (such as 5V), the monitoring chip outputs a high-level signal, and the enable end of the DCDC enables the DCDC based on the received high-level signal, and the DCDC outputs voltage.

[0066] In this embodiment, the second power supply module 20 realizes self-control output through the second power supply monitoring module 22 to avoid affecting the stability of its output voltage due to the reduction of its own voltage, thereby affecting the operating stability of subsequent electrical equipment.

[0067] The above embodiment describes the structure of the first power supply module 10 and the second power supply module 20, and clarifies the implementation process of their functions. The following describes the connection relationship between the second power supply monitoring module 22 and the vehicle controller to clarify the connection between the second power supply monitoring module 22 and the vehicle controller when power is unable to be supplied, so as to ensure the operational reliability of the terminal acted upon by the power supply circuit.

[0068] In some embodiments, the output end of the second power supply monitoring module 22 is further used to connect to the vehicle controller 70 .

[0069] Specifically, the first power supply module 10 is the main power supply module, and the second power supply module 20 is the backup power supply module. The second power supply module 20 plays the role of power supply when the main power supply module cannot supply power. When the second power supply 21 in the second power supply module 20 is abnormal and cannot output voltage, the output end of the second power supply monitoring module 22 is connected to the vehicle controller 70, so that the vehicle controller 70 can promptly learn about the status of the second power supply 21 through the second power supply monitoring module 22, and then can promptly perform some information storage and other operations on the vehicle, in preparation for the situation where the power supply circuit is about to enter without power output, which is beneficial to improving the operating reliability of the electrical equipment powered by the power supply circuit.

[0070] Exemplarily, the second power supply monitoring module 22 is a monitoring chip, and the second power supply 21 is a backup battery pack. When the monitoring chip monitors that the output voltage of the backup battery pack drops to a threshold voltage (such as 3.6V), the monitoring chip inputs a low level and transmits it to the vehicle controller 70. The vehicle controller 70 is informed that the backup battery pack is about to run out of power, and controls the electrical equipment associated with the power supply circuit to perform data storage and enter a power-off state.

[0071] The specific structures of the first switch module 30 and the second switch module 40 are defined below to clarify that the first switch module 30 and the second switch module 40 have other functions in addition to the basic switch function.

[0072] In some embodiments, as Figure 3 As shown, the first switch module 30 includes two first MOS transistors 32 arranged in parallel, and the gates of the two first MOS transistors 32 are both connected to the control end 31 of the first switch module 30 .

[0073] Specifically, the gate of the first MOS transistor 32 is the control terminal of the first MOS transistor 32. By connecting the gates of the two first MOS transistors 32 to the control terminal 31 of the first switch module 30 at the same time, the states of the two first MOS transistors 32 can be switched synchronously, which is conducive to the stable operation of the first switch module 30. In addition, according to the parallel resistance principle, the resistance of the two first MOS transistors 32 arranged in parallel when turned on can be greatly reduced compared with that of a single first MOS transistor 32, thereby improving the power supply efficiency of the first power supply module 10.

[0074] In some embodiments, as Figure 3As shown, the second switch module 40 includes two second MOS tubes 42 arranged in parallel, and the gates of the two second MOS tubes 42 are connected with the control end 41 of the second switch module 40.

[0075] Specifically, the power supply buffer module 50 can be a diode or other components with on-resistance. The resistance of the diode is large, so that there is always a voltage difference greater than the threshold between the anode and the cathode of the diode. Therefore, the resistance of the diode is much larger than the resistance of the second MOS tube 42. When the second MOS tube 42 is turned on, the competitiveness of the second MOS tube 42 is much greater than that of the diode, resulting in a voltage difference between the anode and the cathode of the diode less than the threshold, and thus the power supply buffer module 50 is disconnected, realizing smooth switching between the second switch module 40 and the power supply buffer module 50. The gates of the two second MOS tubes 42 are the control ends of the second MOS tubes 42, and connecting the gates of the two second MOS tubes 42 with the control end 41 of the second switch module 40 at the same time can make the state switching of the two second MOS tubes 42 synchronous, which is conducive to the stable operation of the second switch module 40. According to the parallel resistance principle, the resistance of the two second MOS tubes 42 arranged in parallel when turned on can be greatly reduced compared with one second MOS tube 42, thereby improving the power supply efficiency of the second power supply module 20.

[0076] It should be noted that in actual application, the first power supply module 10 is a main power supply module, and the second power supply module 20 is a backup power supply module. The output voltage of the first power 13 of the first power supply module 10 is different from the output voltage of the second power 21 of the second power supply module 20, but the two power supplies are processed by the first power supply processing module 15 and the second power supply processing module 23 respectively as output voltage, and the output voltages of the first power supply module 10 and the second power supply module 20 are the same, which can ensure the power stability of the electrical equipment.

[0077] In addition, the second power 21 is a backup battery pack, which can be a 3-battery or a 4-battery. According to the size of the space in the actual installation process, it can be designed flexibly. When the output voltage of the second power 21 is smaller than the output voltage of the second power supply module 20, the second power supply processing module 23 can be a boost chip. When the output voltage of the second power 21 is greater than the output voltage of the second power supply module 20, the second power supply processing module 23 can be a buck chip.

[0078] Finally, the second power 21 can be a 4-battery, and the second power supply processing module 23 is set to a buck chip, using a buck scheme, which can significantly improve the voltage conversion efficiency of the second power 21 and is conducive to the service life of the second power 21.

[0079] Based on the same inventive concept, the present application also provides a vehicle-mounted wireless terminal, comprising the above-mentioned power supply circuit, and its beneficial effects are the same as those of the above-mentioned power supply circuit, which will not be described in detail here.

[0080] Based on the same inventive concept, the present application also provides a vehicle, comprising the vehicle-mounted wireless terminal as described above, and its beneficial effects are the same as those of the vehicle-mounted wireless terminal as described above, which will not be described in detail here.

[0081] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0082] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power supply circuit, characterized in that: It includes a first power supply module, a second power supply module, a first switch module, a second switch module, a power supply buffer module and an output module; The first power supply module, the first switch module and the output module are connected in sequence, the second power supply module, the second switch module and the output module are connected in sequence, and the power supply buffer module is arranged in parallel with the second switch module; During the switching process between the first switch module and the second switch module, the power supply buffer module conducts power between the second power supply module and the output module.

2. The power supply circuit according to claim 1, wherein: The control end of the first switch module is connected to the power supply monitoring end of the first power supply module, and the control end of the second switch module is connected to the power supply output end of the first power supply module; When the signal from the power supply monitoring terminal is abnormal, the first switch module is turned off, and the power supply buffer module conducts between the second power supply module and the output module; When the signal of the power supply output end is abnormal, the second switch module switches on the second power supply module and the output module, and the power supply buffer module switches off; Wherein, in the transmission direction of the electrical signal, the power supply monitoring end is located before the power supply output end.

3. The power supply circuit according to claim 2, wherein: The power supply buffer module includes a diode, an anode of the diode is connected to the second power supply module, and a cathode of the diode is connected to the output module.

4. The power supply circuit according to claim 2, characterized in that: The first power supply module includes a first power supply, a first power supply monitoring module and a first power supply processing module. The first power supply is connected to the first power supply processing module, the input end of the first power supply monitoring module is connected to the output end of the first power supply, the output end of the first power supply monitoring module is connected to the enable end of the first power supply processing module and the power supply monitoring end, and the output end of the first power supply processing module is connected to the power supply output end.

5. The power supply circuit according to claim 2, characterized in that: The second power supply module includes a second power supply, a second power supply monitoring module and a second power supply processing module. The second power supply and the second power supply processing module are connected. The input end of the second power supply monitoring module is connected to the output end of the second power supply, and the output end of the second power supply monitoring module is connected to the enable end of the second power supply processing module.

6. The power supply circuit according to claim 5, characterized in that: The output end of the second power supply monitoring module is also used to connect to the vehicle controller.

7. The power supply circuit according to claim 2, wherein: The first switch module includes two first MOS transistors arranged in parallel, and the gates of the two first MOS transistors are both connected to the control end of the first switch module.

8. The power supply circuit according to claim 2, wherein: The second switch module includes two second MOS transistors arranged in parallel, and the gates of the two second MOS transistors are both connected to the control end of the second switch module.

9. A vehicle-mounted wireless terminal, characterized in that: The power supply circuit comprises the power supply circuit according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle-mounted wireless terminal includes the vehicle-mounted wireless terminal according to claim 9.

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