CN219287196U - Car networking system and power supply circuit for car-mounted T-BOX - Google Patents
Car networking system and power supply circuit for car-mounted T-BOX Download PDFInfo
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- CN219287196U CN219287196U CN202223541035.5U CN202223541035U CN219287196U CN 219287196 U CN219287196 U CN 219287196U CN 202223541035 U CN202223541035 U CN 202223541035U CN 219287196 U CN219287196 U CN 219287196U
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Abstract
The application provides a networking system, be used for on-vehicle T-BOX's power supply circuit, this circuit includes: the device comprises a vehicle-mounted storage battery, a standby battery, a button battery and a power supply switching unit; wherein: the vehicle-mounted storage battery, the standby battery and the button battery are respectively connected with the power supply switching unit, the power supply switching unit respectively detects the voltage of each battery through the MCU of the vehicle-mounted T-BOX, and according to the detected voltage, the corresponding battery is switched among the vehicle-mounted storage battery, the standby battery and the button battery to supply power for the vehicle-mounted T-BOX, namely, the button battery is added as a third power supply mode.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a power supply circuit of a vehicle networking system and a vehicle-mounted T-BOX.
Background
The vehicle-mounted T-BOX (Telematics BOX) is mainly used for communicating with a background system/mobile phone APP, and vehicle information display and control of the mobile phone APP are achieved. The vehicle-mounted T-BOX uses the vehicle-mounted storage battery to provide electric energy, but under special conditions, such as failure flameout occurs in the running process of the vehicle, the internal storage battery cannot supply power or failure such as disconnection of the storage battery and a main board connector occurs due to rollover, and when the vehicle-mounted storage battery cannot supply power to the vehicle-mounted T-BOX, a special standby battery is needed to provide emergency electric energy for the vehicle-mounted T-BOX so as to ensure short-term uninterrupted operation of the vehicle-mounted T-BOX.
Currently, nickel-metal hydride 3 batteries or 4 batteries are generally used as backup batteries. Because all connect through the connector between battery, on-vehicle battery and the mainboard, and all have certain weight, when the crash accident that the vehicle took place is comparatively serious, the connector between on-vehicle battery, battery and the mainboard breaks off easily, causes the car owner unable use ECALL to seek help.
Disclosure of Invention
In this regard, the application provides a car networking system, be used for on-vehicle T-BOX's power supply circuit to solve current in-process that is on-vehicle T-BOX through on-vehicle battery and battery backup, because of on-vehicle battery and battery backup all have certain weight, when the vehicle takes place the collision accident, the connector between on-vehicle battery, battery backup and the mainboard breaks off easily, thereby causes the problem that can' T be for car networking system, on-vehicle T-BOX power supply.
In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:
the first aspect of the application discloses a power supply circuit for an on-board T-BOX, comprising: the device comprises a vehicle-mounted storage battery, a standby battery, a button battery and a power supply switching unit; wherein:
the vehicle-mounted storage battery, the standby battery and the button battery are respectively connected with the power supply switching unit, the power supply switching unit respectively detects the voltage of each battery through the MCU of the vehicle-mounted T-BOX, and the corresponding battery is switched from the vehicle-mounted storage battery, the standby battery and the button battery to supply power for the vehicle-mounted T-BOX according to the detected voltage.
Optionally, in the power supply circuit for an on-board T-BOX, the button battery is connected to a motherboard of the on-board T-BOX through a corresponding connector.
Optionally, in the above power supply circuit for a vehicle-mounted T-BOX, the button battery is fixed on the motherboard.
Optionally, in the above power supply circuit for an on-vehicle T-BOX, the power supply switching unit includes: the device comprises a vehicle-mounted storage battery power supply control unit, a standby battery power supply control unit and a button battery control power supply unit;
the vehicle-mounted storage battery power supply control unit controls the vehicle-mounted storage battery to supply power to the vehicle-mounted T-BOX when the voltage of the vehicle-mounted storage battery is larger than a minimum storage battery voltage threshold value;
the standby battery power supply control unit controls the standby battery to supply power to the vehicle-mounted T-BOX when the voltage of the vehicle-mounted storage battery is smaller than the minimum storage voltage threshold value and the self voltage of the standby battery is larger than the minimum standby battery voltage threshold value;
and the button battery control power supply unit is used for controlling the button battery to supply power for the vehicle-mounted T-BOX when the voltage of the vehicle-mounted storage battery is smaller than the minimum storage battery voltage threshold and the voltage of the standby battery is smaller than the minimum standby battery voltage threshold.
Optionally, in the above power supply circuit for an on-vehicle T-BOX, the on-vehicle battery power supply control unit includes: the first resistor, the second resistor, the third resistor, the fourth resistor, the first switch and the second switch;
one end of the first resistor and the base electrode of the first switch are used as a first input end of the vehicle-mounted storage battery power supply control unit and are used for receiving the voltage of the vehicle-mounted storage battery; the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the emitter of the first switch and grounded;
the collector of the first switch is connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the fourth resistor and the grid electrode of the second switch, and the drain electrode of the second switch is used as a second input end of the vehicle-mounted storage battery power supply control unit and receives the primary power supply voltage of the vehicle-mounted storage battery;
the other end of the fourth resistor is connected with the source electrode of the second switch, and the connecting point is used as the output end of the vehicle-mounted storage battery power supply control unit and is connected to the system power port of the vehicle-mounted T-BOX.
Optionally, in the above power supply circuit for an on-vehicle T-BOX, the backup battery power supply control unit includes: a first diode, a second diode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third switch, a fourth switch, and a fifth switch;
the anode of the first diode is used as a first input end of the standby battery power supply control unit and used for receiving the voltage of the vehicle-mounted storage battery; the cathode of the first diode is connected to one end of the sixth resistor and the cathode of the second diode through the fifth resistor, and the other end of the sixth resistor is grounded;
the anode of the second diode is respectively connected with one end of the seventh resistor and the base electrode of the third switch, the other end of the seventh resistor is respectively connected with the collector electrode of the third switch and one end of the eighth resistor, and the other end of the eighth resistor is used as a second input end of the standby battery power supply control unit and receives MCU signals;
the emitter of the third switch is connected with the base electrode of the fourth switch, the collector of the fourth switch is respectively connected with one end of the tenth resistor and the grid electrode of the fifth switch through the ninth resistor, and the emitter of the fourth switch is grounded;
the other end of the tenth resistor is connected with the source electrode of the fifth switch, and the connection point is used as a third input end of the standby battery power supply control unit to receive the voltage of the standby battery;
and the drain electrode of the fifth switch is used as the output end of the standby battery power supply control unit and is connected to the system power port of the vehicle-mounted T-BOX.
Optionally, in the above power supply circuit for an on-vehicle T-BOX, the button cell control power supply unit includes: a third diode, a fourth diode, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth switch, a seventh switch, and an eighth switch;
the anode of the third diode is used as a first input end of the button battery control power supply unit and is used for receiving the voltage of the standby battery; the cathode of the third diode is connected to one end of the twelfth resistor and the cathode of the fourth diode through the eleventh resistor, and the other end of the twelfth resistor is grounded;
the anode of the fourth diode is respectively connected with one end of the thirteenth resistor and the base electrode of the sixth switch, the other end of the thirteenth resistor is respectively connected with the collector electrode of the sixth switch and one end of the fourteenth resistor, and the other end of the fourteenth resistor is used as a second input end of the button battery control power supply unit and receives MCU signals;
the emitter of the sixth switch is connected with the base electrode of the seventh switch, the collector of the seventh switch is respectively connected with one end of the sixteenth resistor and the grid electrode of the eighth switch through the fifteenth resistor, and the emitter of the seventh switch is grounded;
the other end of the sixteenth resistor is connected with the source electrode of the eighth switch, and the connection point is used as a third input end of the button battery control power supply unit to receive the voltage of the button battery;
and the drain electrode of the eighth switch is used as the output end of the button battery control power supply unit and is connected to the system power port of the vehicle-mounted T-BOX.
Optionally, in the above power supply circuit for an on-vehicle T-BOX, the power supply circuit further includes: and the standby battery boosting unit is connected with the standby battery and used for boosting the voltage output by the standby battery.
Optionally, in the above power supply circuit for an on-vehicle T-BOX, the power supply circuit further includes: and the button battery boosting unit is connected with the button battery and used for boosting the voltage output by the button battery.
A second aspect of the present application discloses a system for internet of vehicles, comprising: the system comprises a host, a vehicle-mounted T-BOX, a mobile phone APP and a background system; the in-vehicle T-BOX is provided with the power supply circuit of the in-vehicle T-BOX as disclosed in any one of the first aspects for the power supply circuit of the in-vehicle T-BOX.
The power supply circuit for an on-vehicle T-BOX that this application provided includes: the device comprises a vehicle-mounted storage battery, a standby battery, a button battery and a power supply switching unit; wherein: the vehicle-mounted storage battery, the standby battery and the button battery are respectively connected with the power supply switching unit, the power supply switching unit respectively detects the voltage of each battery through the MCU of the vehicle-mounted T-BOX, and according to the detected voltage, the corresponding battery is switched among the vehicle-mounted storage battery, the standby battery and the button battery to supply power for the vehicle-mounted T-BOX, namely, the button battery is added as a third power supply mode.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of a power supply circuit for an on-board T-BOX according to an embodiment of the present application;
fig. 2 is a schematic diagram of a specific structure of a power supply switching unit according to an embodiment of the present application;
fig. 3 is a schematic diagram of a specific structure of a vehicle-mounted battery power supply control unit according to an embodiment of the present application;
fig. 4 is a schematic diagram of a specific structure of a battery backup power supply control unit according to an embodiment of the present application;
fig. 5 is a schematic diagram of a specific structure of a button cell control power supply unit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a power supply circuit for an on-board T-BOX according to another embodiment of the present application;
fig. 7 is a logic flow diagram of switching of a power supply circuit for an on-board T-BOX according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The application provides a power supply circuit for on-vehicle T-BOX to solve current in-process that is on-vehicle T-BOX power supply through on-vehicle battery and battery backup, because of on-vehicle battery and battery backup all have certain weight, lead to the vehicle when the collision accident takes place, connector between on-vehicle battery, battery backup and the mainboard breaks off easily, thereby cause unable system, on-vehicle T-BOX power supply problem for the car.
Referring to fig. 1, the power supply circuit for an on-board T-BOX mainly includes: an in-vehicle storage battery 101, a backup battery 102, a button battery 103, and a power supply switching unit 104. The vehicle-mounted storage battery 101, the standby battery 102 and the button battery 103 are respectively connected with the power supply switching unit 104, the power supply switching unit 104 respectively detects the voltage of each battery through the MCU of the vehicle-mounted T-BOX, and according to the detected voltage, the corresponding battery is switched from the vehicle-mounted storage battery 101, the standby battery 102 and the button battery 103 to supply power for the vehicle-mounted T-BOX.
In practical application, the button cell 103 is connected to the motherboard of the vehicle-mounted T-BOX through a corresponding connector to supply power to the vehicle-mounted T-BOX.
The button cell 103 has the advantages of small volume, light weight and the like, and can be fixed on the main board. When a vehicle collides, the vehicle is not easy to separate from the main board, and information can be automatically uploaded to the background in an emergency, so that the reliability of power supply for the vehicle-mounted T-BOX is improved.
It should be noted that, the connector connected between the button cell 103 and the motherboard of the vehicle-mounted T-BOX may be a connector with low impedance, and the button cell may be fixed on the motherboard, and its specific type may be determined according to the application environment and the user requirement, which is not limited in this application, and is within the protection scope of this application.
It should be noted that, the MCU of the vehicle-mounted T-BOX detects the voltage of the power supply loop through the ADC during the operation process, and triggers the switching action in advance once the voltage is found to be reduced abnormally (lower than a preset value).
In practical application, as shown in fig. 2, the power supply switching unit 104 may include: a vehicle-mounted battery power supply control unit 1041, a backup battery power supply control unit 1042, and a button battery control power supply unit 1043; the in-vehicle battery power supply control unit 1041 controls the in-vehicle battery 101 to supply power to the in-vehicle T-BOX when the voltage of the in-vehicle battery is greater than the minimum battery voltage threshold. The backup battery power supply control unit 1042 controls the backup battery 102 to supply power to the vehicle-mounted T-BOX when the voltage of the vehicle-mounted battery is smaller than the minimum battery voltage threshold and when the self-voltage of the backup battery is larger than the minimum backup battery voltage threshold. The button cell control power supply unit 1043 controls the button cell 103 to supply power to the vehicle-mounted T-BOX when the voltage of the vehicle-mounted battery is smaller than the minimum battery voltage threshold and the voltage of the backup battery is smaller than the minimum backup battery voltage threshold.
Specifically, if the system in which the vehicle-mounted T-BOX is located is a 12V system, the minimum battery voltage threshold may be 6V; if the system where the vehicle-mounted T-BOX is located is a 24V system, the minimum storage battery voltage threshold value can be 12V; of course, the present application is not limited thereto, and can be determined according to the application environment and the user requirement, and the present application is not limited thereto, and is within the scope of protection of the present application.
Similarly, the specific value of the minimum standby battery voltage threshold can be determined according to the application environment and the user requirement, and the application is not particularly limited and is within the protection scope of the application.
As shown in fig. 3, the in-vehicle battery power supply control unit 1041 may include: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first switch Q1 and the second switch Q2.
One end of the first resistor R1 is used as a first input end of the vehicle-mounted battery power supply control unit 1041, and receives a voltage (UBD in the figure) of the vehicle-mounted battery; the other end of the first resistor R1 is respectively connected with one end of a second resistor R2 and the base electrode of the first switch Q1, the other end of the second resistor R2 is connected with the emitter electrode of the first switch Q1 and is grounded (GND in the figure); the collector of the first switch Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with one end of a fourth resistor R4 and the grid electrode of a second switch Q2, and the drain electrode of the second switch Q2 is used as a second input end of a vehicle-mounted storage battery power supply control unit 1041 and receives the primary power supply voltage (primary power supply voltage in the figure) of the vehicle-mounted storage battery; the other end of the fourth resistor R4 is connected to the source of the second switch Q2, and the connection point is an output end of the in-vehicle battery power supply control unit 1041 and connected to a system power supply port (system power supply port in the figure) of the in-vehicle T-BOX.
In practical application, the voltage dividing ratio of the first resistor R1 and the second resistor R2 may be set, so that when the voltage of the vehicle-mounted battery is smaller than the minimum battery voltage threshold, the vehicle-mounted battery power supply control unit 1041 turns off the first switch Q1, so that the voltage output to the system power port of the vehicle-mounted T-BOX through the second switch Q2 is turned off, and the power supply to the vehicle-mounted T-BOX through the vehicle-mounted battery 101 is stopped.
Specifically, the first resistor R1 may be set to 1mΩ and the second resistor R2 may be set to 200kΩ; of course, the specific values of the first resistor R1 and the second resistor R2 are not limited thereto, and may be determined according to the application environment and the user requirement, which are not limited thereto, and are all within the protection scope of the present application.
In normal cases, when the in-vehicle battery 101 supplies power to the in-vehicle T-BOX, the in-vehicle battery 101 is stepped down to the primary power supply voltage.
As shown in fig. 4, the backup battery power supply control unit 1042 may include: a first diode Z1, a second diode Z2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third switch Q3, a fourth switch Q4, and a fifth switch Q5.
The anode of the first diode Z1 is used as a first input end of the standby battery power supply control unit 1042, and receives the voltage of the vehicle-mounted storage battery; the cathode of the first diode Z1 is connected to one end of a sixth resistor R6 and the cathode of the second diode Z2 through a fifth resistor R5, respectively, and the other end of the sixth resistor R6 is grounded (GND in the figure); the anode of the second diode Z2 is connected to one end of the seventh resistor R7 and the base of the third switch Q3, the other end of the seventh resistor R7 is connected to the collector of the third switch Q3 and one end of the eighth resistor R8, and the other end of the eighth resistor R8 is used as the second input end of the backup battery power supply control unit 1042, and receives the MCU signal (the signal output by mcu_gpio in the figure); an emitter of the third switch Q3 is connected with a base electrode of a fourth switch Q4, a collector of the fourth switch Q4 is respectively connected with one end of a tenth resistor R10 and a grid electrode of a fifth switch Q5 through a ninth resistor R9, and the emitter of the fourth switch Q4 is grounded (GND in the figure); the other end of the tenth resistor R10 is connected to the source of the fifth switch Q5, and the connection point is used as the third input end of the standby battery power supply control unit 1042, and receives the voltage of the standby battery; the drain of the fifth switch Q5 is connected as an output terminal of the battery backup power supply control unit 1042 to a system power port (system power port in the drawing) of the vehicle-mounted T-BOX.
When the MCU detects that the voltage of the vehicle-mounted storage battery is smaller than the minimum storage battery voltage threshold, the voltage of the standby battery is detected in parallel, if the voltage of the standby battery is larger than the minimum standby battery voltage threshold and the temperature of the standby battery is normal, the mcu_gpio can output a high level while the second switch Q2 is turned off, that is, the MCU signal is high, so that the collector and the emitter of the third switch Q3 are turned on, the base of the fourth switch Q4 is pulled high, the fourth switch Q4 is completely turned on and enters a saturated working area, and therefore the fifth switch Q5 is controlled to be turned on, and the standby battery supplies power to the system power port of the vehicle-mounted T-BOX.
When the vehicle-mounted storage battery is abnormal, the second switch Q2 is closed through the GPIO port of the MCU and the vehicle-mounted storage battery, and the standby battery supplies power to the system power port of the vehicle-mounted T-BOX.
As shown in fig. 5, the button cell control power supply unit 1043 may include: the third diode Z3, the fourth diode Z4, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8.
The anode of the third diode Z3 is used as a first input end of the button battery control power supply unit 1043, and receives the voltage of the backup battery; the cathode of the third diode Z3 is respectively connected to one end of a twelfth resistor R12 and the cathode of the fourth diode Z4 through an eleventh resistor R11, and the other end of the twelfth resistor R12 is grounded; the anode of the fourth diode Z4 is connected to one end of the thirteenth resistor R13 and the base of the sixth switch Q6, the other end of the thirteenth resistor R13 is connected to the collector of the sixth switch Q6 and one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is used as the second input end of the button cell control power supply unit 1043, and receives an MCU signal (a signal output by the mcu_gpio in the figure); an emitter of the sixth switch Q6 is connected with a base electrode of the seventh switch Q7, a collector of the seventh switch Q7 is respectively connected with one end of a sixteenth resistor R16 and a grid electrode of an eighth switch Q8 through a fifteenth resistor R15, and the emitter of the seventh switch Q7 is grounded; the other end of the sixteenth resistor R16 is connected with the source electrode of the eighth switch Q8, and the connection point is used as a third input end of the button battery control power supply unit 1043 for receiving the voltage of the button battery; the drain of the eighth switch Q8 is connected to a system power supply port (system power supply port in the figure) of the vehicle-mounted T-BOX as an output terminal of the button cell control power supply unit 1043.
When the MCU detects that the voltage of the vehicle-mounted storage battery is smaller than the minimum storage battery voltage threshold and the voltage of the standby battery is smaller than the minimum standby battery voltage threshold, a high level can be output through the MCU_GPIO, namely the MCU signal is high, so that the collector electrode and the emitter electrode of the sixth switch Q6 are conducted, the base electrode of the seventh switch Q7 is pulled high, the seventh switch Q7 is completely opened and enters a saturated working area, the eighth switch Q8 is controlled to be conducted, and the button battery supplies power for the vehicle-mounted T-BOX.
It should be noted that when the MCU detects that the voltage of the vehicle-mounted storage battery and the voltage of the standby battery are both smaller than the corresponding minimum battery voltage threshold, the MCU switches to the button battery to supply power to the vehicle-mounted T-BOX.
In practice, the vehicle-mounted storage battery 101 is generally composed of a storage battery and a primary power supply DCDC, the storage battery can input 12V or 24V voltage to the whole ECU, and the primary power supply DCDC converts the voltage into 5V voltage so as to supply power for the vehicle-mounted T-BOX.
The backup battery 102 may be a nickel metal hydride battery, typically consisting of 3 or 4 batteries. When the spare battery 102 is 3 batteries, the voltage of each battery may be 1.2 v_yp, so the voltage of the 3 batteries is 3.6 v_yp, and a spare battery boosting unit is needed to boost the voltage of the 3.6V to 5V, i.e., as shown in fig. 6 (a nickel-metal hydride battery is taken as an example). Specifically, the backup battery boosting unit may be a BOOST chip, and the model may be: TPS55340; of course, the specific type of the BOOST chip is not limited thereto, and may be determined according to the application environment and the user requirement, which is not limited thereto and is within the protection scope of the present application.
It should be noted that, the system power port of the vehicle-mounted T-BOX in the embodiment of the present application is generally a port for supplying power to the vehicle-mounted T-BOX, which corresponds to the system power VCC5V in fig. 6. The system power VCC5V may represent the system power of the on-board T-BOX with a port voltage of 5V.
In practice, the charging circuit may be additionally provided to control the vehicle-mounted storage battery to charge the backup battery.
A specific model of button cell 103 may be CR2032; of course, the present application is not limited thereto, and can be determined according to the application environment and the user requirement, and the present application is not limited thereto, and is within the protection scope of the present application.
In practice, a button cell boosting unit connected with the button cell 103 may be added, where the button cell boosting unit is used to boost the voltage output by the button cell 103, as shown in fig. 6. The button cell boosting unit can be a BOOST chip, and the model can be: TPS613783; of course, the specific type of the BOOST chip is not limited thereto, and may be determined according to the application environment and the user requirement, which is not limited thereto and is within the protection scope of the present application.
Since the voltage of a button cell used in general is 2.3V, it is necessary to increase the voltage of the button cell to 5V for power supply of the vehicle T-BOX by adding a button cell voltage increasing unit.
It should be noted that the vehicle-mounted battery 101 may supply power to the entire ECU; the backup battery 102 can ensure that the vehicle owner seeks third party assistance using ECALL calls; the button cell 103 power supply system enters an emergency help mode, only an MCU communicated with the background is reserved, and other peripheral devices are all closed; the MCU is used for transmitting the emergency help information to the background, and after the background receives the emergency help information, the information can be quickly contacted with a vehicle owner to know the situation or help in an alarm mode.
Based on the above, with reference to fig. 7, assuming that the backup battery is a nickel-metal hydride battery, a detailed description of the switching logic of the power supply circuit for the vehicle-mounted T-BOX is as follows:
step 1: and judging whether the voltage of the vehicle-mounted storage battery is larger than a minimum storage battery voltage threshold value.
If the voltage of the vehicle-mounted storage battery is larger than the minimum storage battery voltage threshold value, the ECU of the vehicle-mounted T-BOX complete machine works normally. And if the voltage of the vehicle-mounted storage battery is smaller than the minimum storage battery voltage threshold value, executing the step 2.
Step 2: and judging whether the voltage of the nickel-metal hydride battery is larger than a minimum standby battery voltage threshold value.
If the voltage of the nickel-metal hydride battery is larger than the voltage threshold value of the minimum standby battery, executing the step 3; if it is determined that the voltage of the nickel-metal hydride battery is not greater than the minimum standby battery voltage threshold, step 4 is performed.
Step 3: and the nickel-hydrogen battery is internally provided with a thermistor, and whether the temperature of the nickel-hydrogen battery is normal is detected according to ADC voltage detection.
If the power is normal, the power is switched to the nickel-metal hydride battery to supply power, and the ECALL telephone is used for seeking help. If not, executing the step 4.
Step 4: and switching to button battery power supply to enable the MCU to upload information to the background for help.
Based on the above principle, the power supply circuit for a vehicle-mounted T-BOX provided in this embodiment includes: a vehicle-mounted storage battery 101, a backup battery 102, a button battery 103, and a power supply switching unit 104; wherein: the vehicle-mounted storage battery 101, the standby battery 102 and the button battery 103 are respectively connected with the power supply switching unit 104, the power supply switching unit 104 respectively detects the voltage of each battery through the MCU of the vehicle-mounted T-BOX, and according to the detected voltage, the corresponding battery is switched from the vehicle-mounted storage battery 101, the standby battery 102 and the button battery 103 to supply power for the vehicle-mounted T-BOX, namely the button battery is added as a third power supply mode, and the problem that the vehicle-mounted storage battery 101, the standby battery 102 and a main board cannot supply power for a vehicle networking system due to the fact that the button battery 103 is small in size and light in weight in the process of supplying power for the vehicle-mounted T-BOX through the vehicle-mounted storage battery 101 and the standby battery 102 is solved, and the connector between the vehicle-mounted storage battery 101, the standby battery 102 and the main board is easily disconnected when a collision accident occurs due to the fact that certain weight exists.
Optionally, another embodiment of the present application further provides an internet of vehicles system, mainly including: the system comprises a host, a vehicle-mounted T-BOX, a mobile phone APP and a background system; the vehicle-mounted T-BOX is provided with the power supply circuit for the vehicle-mounted T-BOX according to any embodiment.
It should be noted that, the related description of the power supply circuit for the vehicle-mounted T-BOX may refer to the above embodiment, and the related description of the internet of vehicles system may also refer to the prior art, which is not repeated herein.
Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended 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.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A power supply circuit for an on-board T-BOX, comprising: the device comprises a vehicle-mounted storage battery, a standby battery, a button battery and a power supply switching unit; wherein:
the vehicle-mounted storage battery, the standby battery and the button battery are respectively connected with the power supply switching unit, the power supply switching unit respectively detects the voltage of each battery through the MCU of the vehicle-mounted T-BOX, and the corresponding battery is switched from the vehicle-mounted storage battery, the standby battery and the button battery to supply power for the vehicle-mounted T-BOX according to the detected voltage.
2. The power supply circuit for an on-board T-BOX according to claim 1, wherein the button cell is connected to a motherboard of the on-board T-BOX through a corresponding connector.
3. The power supply circuit for an on-board T-BOX according to claim 2, wherein the button cell is fixed to the main board.
4. The power supply circuit for an in-vehicle T-BOX according to claim 1, wherein the power supply switching unit includes: the device comprises a vehicle-mounted storage battery power supply control unit, a standby battery power supply control unit and a button battery control power supply unit;
the vehicle-mounted storage battery power supply control unit controls the vehicle-mounted storage battery to supply power to the vehicle-mounted T-BOX when the voltage of the vehicle-mounted storage battery is larger than a minimum storage battery voltage threshold value;
the standby battery power supply control unit controls the standby battery to supply power to the vehicle-mounted T-BOX when the voltage of the vehicle-mounted storage battery is smaller than the minimum storage battery voltage threshold value and the self voltage of the standby battery is larger than the minimum standby battery voltage threshold value;
and the button battery control power supply unit is used for controlling the button battery to supply power for the vehicle-mounted T-BOX when the voltage of the vehicle-mounted storage battery is smaller than the minimum storage battery voltage threshold and the voltage of the standby battery is smaller than the minimum standby battery voltage threshold.
5. The power supply circuit for an in-vehicle T-BOX according to claim 4, wherein the in-vehicle battery power supply control unit includes: the first resistor, the second resistor, the third resistor, the fourth resistor, the first switch and the second switch;
one end of the first resistor is used as a first input end of the vehicle-mounted storage battery power supply control unit and is used for receiving the voltage of the vehicle-mounted storage battery; the other end of the first resistor is connected with one end of the second resistor and the base electrode of the first switch respectively, and the other end of the second resistor is connected with the emitter electrode of the first switch and grounded;
the collector of the first switch is connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the fourth resistor and the grid electrode of the second switch, and the drain electrode of the second switch is used as a second input end of the vehicle-mounted storage battery power supply control unit and receives the primary power supply voltage of the vehicle-mounted storage battery;
the other end of the fourth resistor is connected with the source electrode of the second switch, and the connecting point is used as the output end of the vehicle-mounted storage battery power supply control unit and is connected to the system power port of the vehicle-mounted T-BOX.
6. The power supply circuit for an on-board T-BOX according to claim 4, wherein the backup battery power supply control unit includes: a first diode, a second diode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third switch, a fourth switch, and a fifth switch;
the anode of the first diode is used as a first input end of the standby battery power supply control unit and used for receiving the voltage of the vehicle-mounted storage battery; the cathode of the first diode is connected to one end of the sixth resistor and the cathode of the second diode through the fifth resistor, and the other end of the sixth resistor is grounded;
the anode of the second diode is respectively connected with one end of the seventh resistor and the base electrode of the third switch, the other end of the seventh resistor is respectively connected with the collector electrode of the third switch and one end of the eighth resistor, and the other end of the eighth resistor is used as a second input end of the standby battery power supply control unit and receives MCU signals;
the emitter of the third switch is connected with the base electrode of the fourth switch, the collector of the fourth switch is respectively connected with one end of the tenth resistor and the grid electrode of the fifth switch through the ninth resistor, and the emitter of the fourth switch is grounded;
the other end of the tenth resistor is connected with the source electrode of the fifth switch, and the connection point is used as a third input end of the standby battery power supply control unit to receive the voltage of the standby battery;
and the drain electrode of the fifth switch is used as the output end of the standby battery power supply control unit and is connected to the system power port of the vehicle-mounted T-BOX.
7. The power supply circuit for an on-vehicle T-BOX according to claim 4, wherein the button cell control power supply unit includes: a third diode, a fourth diode, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth switch, a seventh switch, and an eighth switch;
the anode of the third diode is used as a first input end of the button battery control power supply unit and is used for receiving the voltage of the standby battery; the cathode of the third diode is connected to one end of the twelfth resistor and the cathode of the fourth diode through the eleventh resistor, and the other end of the twelfth resistor is grounded;
the anode of the fourth diode is respectively connected with one end of the thirteenth resistor and the base electrode of the sixth switch, the other end of the thirteenth resistor is respectively connected with the collector electrode of the sixth switch and one end of the fourteenth resistor, and the other end of the fourteenth resistor is used as a second input end of the button battery control power supply unit and receives MCU signals;
the emitter of the sixth switch is connected with the base electrode of the seventh switch, the collector of the seventh switch is respectively connected with one end of the sixteenth resistor and the grid electrode of the eighth switch through the fifteenth resistor, and the emitter of the seventh switch is grounded;
the other end of the sixteenth resistor is connected with the source electrode of the eighth switch, and the connection point is used as a third input end of the button battery control power supply unit to receive the voltage of the button battery;
and the drain electrode of the eighth switch is used as the output end of the button battery control power supply unit and is connected to the system power port of the vehicle-mounted T-BOX.
8. The power supply circuit for an on-board T-BOX according to claim 1, further comprising: and the standby battery boosting unit is connected with the standby battery and used for boosting the voltage output by the standby battery.
9. The power supply circuit for an on-board T-BOX according to claim 1, further comprising: and the button battery boosting unit is connected with the button battery and used for boosting the voltage output by the button battery.
10. An internet of vehicles system, comprising: the system comprises a host, a vehicle-mounted T-BOX, a mobile phone APP and a background system; the vehicle-mounted T-BOX is provided with a power supply circuit for a vehicle-mounted T-BOX as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223541035.5U CN219287196U (en) | 2022-12-29 | 2022-12-29 | Car networking system and power supply circuit for car-mounted T-BOX |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223541035.5U CN219287196U (en) | 2022-12-29 | 2022-12-29 | Car networking system and power supply circuit for car-mounted T-BOX |
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| Publication Number | Publication Date |
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| CN219287196U true CN219287196U (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223541035.5U Active CN219287196U (en) | 2022-12-29 | 2022-12-29 | Car networking system and power supply circuit for car-mounted T-BOX |
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| Country | Link |
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| CN (1) | CN219287196U (en) |
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2022
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