CN111443644A - OBD power control management system and OBD monitor terminal - Google Patents
OBD power control management system and OBD monitor terminal Download PDFInfo
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- CN111443644A CN111443644A CN202010357337.3A CN202010357337A CN111443644A CN 111443644 A CN111443644 A CN 111443644A CN 202010357337 A CN202010357337 A CN 202010357337A CN 111443644 A CN111443644 A CN 111443644A
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- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
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Abstract
The embodiment of the invention relates to the technical field of automobile power supplies, in particular to an OBD power supply control management system and an OBD monitoring terminal. The system comprises: a power supply module and an MCU; the power supply module comprises an OBD power supply input interface, a standby power supply, a power supply selection circuit and a power supply management chip, wherein the OBD power supply input interface is connected with a storage battery voltage pin of an OBD connector, and the power supply selection circuit is respectively connected with the OBD power supply input interface, the standby power supply and the power supply management chip; the power supply selection circuit is used for determining a power supply from the standby power supply and a storage battery voltage pin of the OBD connector according to the voltage input by the OBD power supply input interface; the power supply management chip is used for outputting a system power supply according to the power supply; and the MCU is used for supplying power to the OBD monitoring terminal according to the system power supply. The invention can support two power supplies of a battery and an OBD and can realize smooth switching of the two power supplies.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of automobile power supplies, in particular to an OBD power supply control management system and an OBD monitoring terminal.
[ background of the invention ]
Automotive emissions are one of the major sources of environmental pollution, and in particular diesel vehicle emissions of nitrogen oxides and particulate matter account for 68.3% and 77.8% of the total emissions of the vehicle, respectively. In order to enhance emission control of heavy diesel vehicles, the national environmental protection department requires remote monitoring of motor vehicle emission, each motor vehicle is forcibly provided with an On-board diagnostic (OBD) monitoring terminal, emission monitoring data are reported to a background management server at regular time through the OBD monitoring terminal, vehicles which do not meet the emission requirements are early warned and alarmed, and vehicle owners are notified to carry out maintenance processing.
OBD monitor terminal need support OBD monitor terminal internal component through the power and carry out work. The conventional OBD monitoring terminal is powered by a pin power supply, which is generally a constant power supply, however, some vehicles do not support the constant power supply.
[ summary of the invention ]
The embodiment of the invention can support two power supplies, namely a battery and an OBD (on-board diagnostics), and can realize smooth switching of the two power supplies.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides an OBD power control management system, which is applied to an OBD monitoring terminal, and the system includes: a power supply module and an MCU;
the power supply module comprises an OBD power supply input interface, a standby power supply, a power supply selection circuit and a power supply management chip, wherein the OBD power supply input interface is connected with a storage battery voltage pin of an OBD connector, and the power supply selection circuit is respectively connected with the OBD power supply input interface, the standby power supply and the power supply management chip; the power supply selection circuit is used for determining a power supply from the standby power supply and a storage battery voltage pin of the OBD connector according to the voltage input by the OBD power supply input interface; the power supply management chip is used for outputting a system power supply according to the power supply;
and the MCU is used for supplying power to the OBD monitoring terminal according to the system power supply.
Optionally, the power selection circuit comprises a first voltage division circuit, a second voltage division circuit, a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit;
the first voltage division circuit is respectively connected with the first switch circuit and the OBD power input interface, the first switch circuit is respectively connected with the OBD power input interface, the second switch circuit and the third switch circuit, the second switch circuit is connected with the fourth switch circuit through the second voltage division circuit, the second voltage division circuit is connected with the OBD power input interface, one ends of the third switch circuit and the fourth switch circuit are both connected with the power management chip, the other end of the third switch circuit is connected with the OBD power input interface, and the other end of the fourth switch circuit is connected with the standby power supply;
the first switch circuit and the second switch circuit are used for being switched on when receiving a high level and being switched off when receiving a low level; the third switch circuit and the fourth switch circuit are used for being switched on when receiving a low level and being switched off when receiving a high level.
Optionally, the first switch circuit and the second switch circuit are N-channel MOS transistors, and the third switch circuit and the fourth switch circuit are P-channel MOS transistors.
Optionally, the power management chip includes a clock chip;
the clock chip is used for awakening the power management chip so that the power management chip outputs a starting signal to trigger the MCU to start.
Optionally, the power module further includes a comparator, and the comparator is respectively connected to the power selection circuit and the power management chip;
the comparator is used for sending a power event signal to the power management chip when power input is detected, so that the power management chip is awakened, and the power management chip sends the starting signal to the MCU so as to trigger the MCU to start.
Optionally, after the MCU is started, the MCU is configured to send a power latch signal to the power management chip and the comparator;
the power supply management chip is used for latching the system power supply according to the power supply latching signal and maintaining the running state;
the comparator is used for interrupting the output power supply event signal according to the power supply latching signal.
Optionally, before the power management chip is turned off, the MCU is configured to set a wakeup time of the clock chip via a bus.
Optionally, the power module further includes a power protection circuit, and the power protection circuit is respectively connected to the OBD power input interface and a battery voltage pin of the OBD connector;
the power supply protection circuit is used for filtering power supply ripples.
Optionally, the power module further comprises a DC-DC circuit, and the DC-DC circuit is respectively connected to the power protection circuit and the OBD power input interface;
the DC-DC circuit is used for converting a power supply connected to a storage battery voltage pin of the OBD connector into an input voltage conforming to a system.
Optionally, the power module further includes a charger, and the charger is respectively connected to the OBD power input interface and the backup power supply;
the charger is used for accessing the voltage input by the OBD power input interface to charge the standby power supply.
Optionally, the standby power supply includes a battery, a battery power sensor and a battery temperature sensor, and the battery power sensor and the battery temperature sensor are respectively connected to the MCU.
Optionally, the system further includes a temperature sensor connected to the MCU, and the temperature sensor is configured to detect a temperature of the system.
In a second aspect, an embodiment of the present invention further provides an OBD vehicle-mounted monitoring terminal, where the OBD vehicle-mounted monitoring terminal includes the OBD power control management system described above.
The invention has the beneficial effects that: compared with the prior art, the embodiment of the invention provides an OBD power control management system and an OBD vehicle-mounted monitoring terminal, wherein the system comprises a power module and an MCU, the power module comprises an OBD power input interface, a standby power supply, a power selection circuit and a power management chip, wherein the power selection circuit is used for determining a power supply from the standby power supply and a storage battery voltage pin of an OBD connector according to the voltage input by the OBD power input interface; the power supply management chip is used for outputting a system power supply according to the power supply; and the MCU is used for supplying power to the OBD monitoring terminal according to the system power supply. The OBD power control management system and the OBD vehicle-mounted monitoring terminal provided by the embodiment of the invention can support two power supplies, namely a battery and an OBD power supply, and can realize smooth switching of the two power supplies.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of an OBD power control management system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an OBD power control management system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a power selection logic according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a power selection circuit provided by an embodiment of the invention;
fig. 5 is a logic diagram for power input control activation according to an embodiment of the present invention.
[ detailed description ] embodiments
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an OBD power control management system according to an embodiment of the present invention, where the system 1000 may be applied to an OBD monitoring terminal, and the OBD monitoring terminal may be mounted on various types of motor vehicles. As shown in fig. 1, the system 1000 includes a power module 10 and an MCU 20. The power module 10 is used for providing power, and the provided power is used for charging the OBD monitoring terminal through the MCU 20. The power module 10 supports a battery and an OBD power supply, in this embodiment, the power module 10 determines a power supply for supplying power to the system from two supported power supplies, and when one of the two power supplies cannot be satisfied, the power module is switched to the other power supply, and the system is not interrupted in the power switching process. After determining a power supply, the MCU20 may send a power latch signal to the power module 10 to keep the power supply determined by the power module 10 operating stably.
Specifically, referring to fig. 1 as well, the power module 10 includes an OBD power input interface 11, a standby power supply 12, a power selection circuit 13, and a power management chip 14. One end of the OBD power input interface 11 is connected with a storage battery voltage pin of the OBD connector, and the other end of the OBD power input interface is connected with the power selection circuit 13. The battery voltage Pin of the OBD connector may specifically be the 16 th Pin of the OBD connector, that is, Pin 16. Pin16 represents a constant power source, and in most vehicles, Pin16 may be directly connected to a battery. The OBD power input interface 11 is connected with a storage battery voltage pin of the OBD connector, so that an OBD constant power supply can be provided for the OBD monitoring terminal. Wherein the OBD connector may particularly be an OBD II connector. The OBD monitoring terminal is connected with an OBD interface on the motor vehicle through the OBD connector, so that the OBD monitoring terminal is communicated with an electronic control unit of the motor vehicle.
The backup power source 12 is connected to the power source selection circuit 13, and the backup power source 12 may be a lithium battery, such as a rechargeable lithium ion battery. The backup power supply 12 is used to provide power to the system.
The power selection circuit 13 is connected to the OBD power input interface 11, the standby power supply 12, and the power management chip 14, respectively. The power selection circuit 13 is configured to select a power supply source for supplying power to the system from the power source accessed by the OBD power input interface 11 and the backup power source 12. In the present embodiment, the main principles of the power selection circuit 13 for selecting the power supply are: when the two paths of power supplies are provided, the power supply accessed by the OBD power supply input interface 11 is preferably used for supplying power to the system; and if the OBD power input interface 11 has no voltage access, selecting the standby power supply 12 to supply power.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram of a power selection logic according to an embodiment of the present invention. As shown in fig. 3, the power supply selection circuit 13 includes a first voltage division circuit 131, a second voltage division circuit 132, a first switch circuit 133, a second switch circuit 134, a third switch circuit 135, and a fourth switch circuit 136. First voltage divider circuit 131 connects respectively first switch circuit 133 with OBD power input interface 11, first switch circuit 133 connects respectively OBD power input interface 11 second switch circuit 134 with third switch circuit 135, second switch circuit 134 passes through second voltage divider circuit 132 connects fourth switch circuit 136, second voltage divider circuit 132 connects OBD power input interface 11, third switch circuit 135 with the one end of fourth switch circuit 136 is all connected power management chip 14, the other end of third switch circuit 135 is connected OBD power input interface 11, the other end of fourth switch circuit 136 is connected stand-by power supply 12.
The first switch circuit 133 and the second switch circuit 134 are configured to be turned on when receiving a high level, and turned off when receiving a low level; the third switch circuit 135 and the fourth switch circuit 136 are configured to be turned on when receiving a low level and turned off when receiving a high level.
If it is detected that the OBD power input interface 11 has an input voltage, the input voltage is divided by the first voltage dividing circuit 131 and then outputs a high level, at this time, the first switch circuit 133 is turned on, the levels of the second switch circuit 134 and the third switch circuit 135 are pulled down, the third switch circuit 135 is turned on, and the voltage input by the OBD power input interface 11 is output to the power management chip 14 through the third switch circuit 135; wherein, the second switch circuit 134 is pulled down until the voltage is cut off; OBD power input interface 11 input voltage extremely second divider circuit 132, through output high level extremely after second divider circuit 132 divides the voltage fourth switch circuit 136 leads to fourth switch circuit 136 ends, at this moment, stand-by power supply 12 passes through fourth switch circuit 136 extremely power management chip 14's route disconnection, entire system by the power supply that OBD power input interface 11 accessed.
If the OBD power input interface 11 does not detect the input voltage, the first switch circuit 133, the second switch circuit 134, the third switch circuit 135 and the fourth switch circuit 136 all have no voltage input by the OBD power input interface 11, and at this time, the fourth switch circuit 136 is in the conducting state, the voltage of the standby power supply 12 is output to the power management chip 14 through the fourth switch circuit 136, and the standby power supply 12 supplies power to the system.
In some other embodiments, as shown in fig. 4, the first switch circuit 133 and the second switch circuit 134 may include N-channel MOS transistors, and the third switch circuit 135 and the fourth switch circuit 136 may include P-channel MOS transistors. When the gate voltages of the MOS transistors corresponding to the first switch circuit 133 and the second switch circuit 134 are increased, the N-channel MOS transistor is turned on; when the gate voltages of the MOS transistors corresponding to the third switch circuit 135 and the fourth switch circuit 136 decrease, the P-channel MOS transistor is turned on. The first voltage dividing circuit 131 is composed of a resistor R306 and a resistor R307, and the second voltage dividing circuit 132 is composed of a resistor R308 and a resistor R309. The first voltage divider circuit 131 is connected to the gate of the MOS transistor Q36 in the first switch circuit 133, the source of the MOS transistor Q36 in the first voltage divider circuit 131 is grounded, and the drain of the MOS transistor Q36 in the first voltage divider circuit 131 is connected to the OBD power input interface 11, the gate of the MOS transistor Q37 in the second switch circuit 134, and the gate of the MOS transistor Q34 in the third switch circuit 135, respectively. The source of the MOS transistor Q37 in the second switch circuit 134 is grounded, and the drain thereof is connected to the OBD power input interface 11 and the second voltage divider circuit 132, respectively. The second voltage division circuit 132 is further connected to a gate of a MOS transistor Q8 in the fourth switch circuit 136, a drain of the Q8 is connected to a battery, and a source of the Q8 is connected to a voltage input interface VIN corresponding to the power management chip 14. The drain of the Q34 in the third switch circuit 135 is also connected to the voltage input interface VIN corresponding to the power management chip 14, and the source of the Q34 is connected to the OBD power input interface 11. The source of Q34 and the OBD power input interface 11 may further be connected in series with a unidirectional diode, when no voltage is present at the gates of Q36, Q34, Q37, and Q8, Q8 is in a conducting state, the voltage of the battery is output to VIN, the battery supplies power to the system, and at the Q34 side, since D6 and D9 are both unidirectional diodes, the voltage does not flow back to the VDD — 5V input terminal. When the voltage VDD _5V is input to the OBD power input interface 11 connected to the first voltage dividing circuit 131, the gate of Q36 is divided by R306 and R307 to be at a high level, Q36 is turned on, the gate levels of Q34 and Q37 are pulled low, Q34 is turned on, and VDD _5V is output to VIN; q37 is cut off, the grid of Q8 is high level after voltage division of R308 and R309 by VDD _5V, Q8 is cut off, the loop from the battery to VIN is disconnected, and the whole system is powered by the OBD power supply connected with the OBD power input interface 11.
It should be noted that fig. 4 is only an example of the power selection circuit 13, and other circuits may be added to or deleted from the circuit.
The power supply source for supplying power to the system is determined by the power selection circuit 13, and may be a battery or an OBD power source, and the OBD power source is preferentially used. According to the power supply selection logic, smooth switching of two power supplies in the selection process is realized, and the operation of a system is not interrupted in the switching process.
The power management chip 14 is used for outputting a system power according to the power supply, the system power is a power meeting the requirements of the MCU20 or the system, such as 0.8V, 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 3.3V, etc. it is understood that the voltage of the power supply input does not necessarily meet the requirements of the MCU20 or the system, therefore, the power management chip 14 can output the system power by way of a Buck circuit or L DO (L low Dropout linear regulator).
After the power supply for supplying power to the system is determined by the power supply selection circuit 13, the power management chip 14 outputs the system power according to the power supply, so that the system can automatically run after being electrified, and the starting condition of the OBD monitoring terminal is not manually controlled. In addition, it can be understood that, when the engine of the motor vehicle is turned off, the OBD monitoring terminal is not required to monitor the exhaust emission of the motor vehicle, and after the engine of the motor vehicle is started, the OBD monitoring terminal needs to be started within a preset time and detect data, for example, within 60 seconds of the start of the engine, and the OBD monitoring terminal needs to detect the data and report the data to the background server. Therefore, the embodiment of the present invention further provides a system boot control logic, where the system boot control logic supports power input start and clock wakeup start of a device. Wherein the power input activation includes a battery insertion activation and an OBD power input activation.
When the system power-on control logic is controlled by power input, as shown in fig. 2 and 5, fig. 2 is a schematic structural diagram of an OBD power control management system provided in the embodiment of the present invention, and fig. 5 is a logic diagram of power input control start provided in the embodiment of the present invention. In fig. 2, the power module 10 further includes a comparator 15, the comparator 15 is respectively connected to the power selection circuit 13 and the power management chip 14, the comparator 15 is configured to send a power event signal to the power management chip 14 when a power input is detected, so that the power management chip 14 is awakened, and the power management chip 14 sends the start signal to the MCU20 to trigger the MCU20 to start. Wherein, when the power is switched on, the comparator 15 can detect whether there is a jump of the input voltage, and if there is a voltage jump, for example, from low level to high level, it indicates that there is a power insertion. And the comparator 15 does not detect the power latching signal sent by the MCU20, which indicates that the system is in a power-on state, the comparator 15 sends the power event signal to the power management chip 14, and after the power management chip 14 receives the power event signal, if the power management chip 14 does not detect the power latching signal sent by the MCU20, the power management chip 14 is started. The started power management chip 14 outputs power to the MCU20, and simultaneously outputs a start signal to the MCU20 to notify the MCU20 of operation. After the MCU20 is running, the MCU20 can send a power latch signal to the comparator 15 and the power management chip 14, wherein when the comparator 15 detects the power latch signal, it indicates that the system is running, and no power event signal is triggered. Furthermore, the power event signal is not triggered if the comparator 15 does not detect a voltage jump.
The MCU20 is started after receiving the start signal, the MCU20 outputs the power latch signal after running stably, and the power latch signal outputs a low level before the MCU20 does not run stably.
Wherein, the power management chip 14 latches the system power according to the power latch signal and maintains the operation state. The system can keep stable operation through the power supply latch signal.
After the power management chip 14 is started, if the power latch signal is not received within a long time (for example, greater than or equal to 5 seconds), the power management chip is shut down, the power supply of the MCU20 is turned off, and the start of the MCU20 is stopped.
Wherein the power latch signal is not generated when the MCU20 is in an off state.
When the system boot control logic is controlled by clock wake-up start-up, the power management chip 14 includes a clock chip, and the clock chip is used to wake up the power management chip 14, so that the power management chip 14 outputs a start-up signal to trigger the MCU20 to start up. Wherein the MCU20 can set the wakeup time of the clock chip via a bus before the power management chip 14 is turned off. When the clock of the clock chip arrives, the power management chip 14 is automatically started, and outputs power and the starting signal to the MCU20, so as to start the MCU 20.
The power management chip 14 and the MCU20 can communicate with each other via an I2C bus.
In this embodiment, the two power-on start modes are supported, one mode is power start, that is, cold start, when the MCU20 is in a shutdown state, the VIN jump triggers the comparator 15 to output a power event signal, the power event signal triggers the power management chip 14 to start and output a voltage and the start signal to the MCU20 to start the MCU20, and after the MCU20 operates stably, the power latch signal is output to lock the power state, so that the system operates stably. The other is clock chip starting, the power management chip 14 is configured with a clock chip, and after the set clock arrives, the power management chip 14 is automatically started to output voltage and the starting signal to the MCU20 to start the MCU 20. In the stable operation of the system, the power latching signal is at a high level, the power of the power management chip 14 is latched and cannot be shut down, the comparator 15 cannot output the power event signal, meanwhile, the power management chip 14 cannot wake up the system again through the clock chip, and the system operation cannot be interrupted.
By the starting control method, the system can be started within the preset time for starting the motor vehicle engine, so that the OBD monitoring terminal can timely detect data and report the data to the background server.
In this embodiment, the system 1000 also supports low power consumption. When the device detects that the engine of the motor vehicle is turned off or the OBD communication is disconnected, the OBD monitoring terminal does not need to continuously monitor, and the MCU20 can inform the power management chip 14 to turn off the system so as to save the system power consumption. After the engine is started, the OBD monitoring terminal needs to enter a monitoring state within 60 s. Because the OBD Pin16 is a constant power supply, the power supply of the motor vehicle can be supplied after being turned off, after the engine is started, the VIN has no obvious signal jump and cannot trigger the starting system through the VIN signal jump, and at the moment, the system needs to be started by waking up by a clock chip of the power management chip 14. The MCU20 completes the wakeup setting of the clock chip through I2C before notifying the power management chip 14 to turn off. After the power management chip 14 is awakened by the clock chip, the MCU20 is started to perform monitoring detection, and when the engine is detected to be running, the engine is kept in a stable running state, otherwise the system is turned off again.
It can be understood that, besides the timely monitoring task of the motor vehicle engine after running, the system is also required to have safety, and because the working environment of the monitoring terminal is complex, the ambient temperature may reach above 75 ℃, the charging part needs to be closely monitored, and the system is prevented from being damaged or spontaneously ignited due to high temperature generated by charging.
Thus, referring also to fig. 2, the system 1000 further includes a temperature sensor 30, and the backup power source 12 further includes a battery power sensor and a battery temperature sensor. The temperature sensor 30 is connected with the MCU20, the temperature sensor 30 is used for detecting the system temperature, and when the system temperature exceeds the preset temperature, the MCU20 can control the system to be closed, and charging is not allowed. The temperature sensor 30 may in particular be a contact temperature sensor arranged on the machine surface. The battery power sensor and the battery temperature sensor are also connected with the MCU20, which can closely monitor the battery part and monitor the residual power of the battery and the current temperature of the battery. The MCU20 can grasp the battery power information and the battery temperature information in real time to perform corresponding processing.
In some other embodiments, referring to fig. 2 as well, the power module 10 further includes a power protection circuit 16 and a DC-DC circuit 17, the power protection circuit 16 is connected to the battery voltage pin of the OBD connector and the DC-DC circuit 17, respectively, and the DC-DC circuit 17 is connected to the OBD power input interface 11.
Wherein the power protection circuit 16 is used for filtering power supply ripples. When the engine is started or shut down, the influence of the drastic voltage change on the system can be relieved through the power supply protection circuit 16 due to large voltage fluctuation. The power protection circuit 16 may be a filter.
The DC-DC circuit 17 is used to convert the power supply connected to the battery voltage pin of the OBD connector into an input voltage conforming to the system. The standard power supply of the motor vehicle is 12V or 24V, and the motor vehicle power supply voltage can be converted into a 5V system power supply output through the DC-DC circuit 17.
Through the power protection circuit 16 and the DC-DC circuit 17, the voltage accessed by the voltage pin of the storage battery of the OBD connector can meet the requirement of the system, and the stable output of the voltage is ensured.
In some other embodiments, referring to fig. 2 as well, the power module 10 further includes a charger 18, the charger 18 is connected to the OBD power input interface 11 and the backup power source 12 in a distributed manner, and the charger 18 is configured to access a voltage input by the OBD power input interface 11 to charge the backup power source 12.
In other embodiments, the system 1000 further comprises an OBD module (not shown) connected to the MCU20, the MCU20 communicating with the OBD module via an automotive communication protocol, the OBD module supporting link selection and communication signal conversion with an ECU of the automotive vehicle.
Different from the prior art, the OBD power control management system provided by the embodiment of the invention can satisfy the following requirements:
1. when the system is powered on (an OBD power supply or a battery is plugged in), the system automatically operates;
2. when the system does not need to monitor and operate, the system is automatically closed, so that the energy consumption of the battery is saved;
3. the OBD monitoring terminal needs to detect data and report the data to a background server within 60s of starting the engine;
4. the power supply scheme is safe, and dangers such as faults or combustion caused by high temperature are prevented;
5. and two power supplies, namely a battery and an OBD power supply are supported, the OBD power supply has priority, the two power supplies can be smoothly switched, and the system operation is not interrupted in the switching process.
The embodiment of the invention also provides an OBD vehicle-mounted monitoring terminal which comprises the OBD power supply control management system. The OBD vehicle-mounted monitoring terminal meets the requirements related to the power supply and has the same beneficial effects as the OBD power supply control management system.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. The utility model provides an OBD power control management system, is applied to OBD monitor terminal, its characterized in that, the system includes: a power supply module and an MCU;
the power supply module comprises an OBD power supply input interface, a standby power supply, a power supply selection circuit and a power supply management chip, wherein the OBD power supply input interface is connected with a storage battery voltage pin of an OBD connector, and the power supply selection circuit is respectively connected with the OBD power supply input interface, the standby power supply and the power supply management chip; the power supply selection circuit is used for determining a power supply from the standby power supply and a storage battery voltage pin of the OBD connector according to the voltage input by the OBD power supply input interface; the power supply management chip is used for outputting a system power supply according to the power supply;
and the MCU is used for supplying power to the OBD monitoring terminal according to the system power supply.
2. The system of claim 1, wherein the power selection circuit comprises a first voltage divider circuit, a second voltage divider circuit, a first switch circuit, a second switch circuit, a third switch circuit, and a fourth switch circuit;
the first voltage division circuit is respectively connected with the first switch circuit and the OBD power input interface, the first switch circuit is respectively connected with the OBD power input interface, the second switch circuit and the third switch circuit, the second switch circuit is connected with the fourth switch circuit through the second voltage division circuit, the second voltage division circuit is connected with the OBD power input interface, one ends of the third switch circuit and the fourth switch circuit are both connected with the power management chip, the other end of the third switch circuit is connected with the OBD power input interface, and the other end of the fourth switch circuit is connected with the standby power supply;
the first switch circuit and the second switch circuit are used for being switched on when receiving a high level and being switched off when receiving a low level; the third switch circuit and the fourth switch circuit are used for being switched on when receiving a low level and being switched off when receiving a high level.
3. The system of claim 2, wherein the first and second switching circuits are N-channel MOS transistors and the third and fourth switching circuits are P-channel MOS transistors.
4. The system of claim 1, wherein the power management chip comprises a clock chip;
the clock chip is used for awakening the power management chip so that the power management chip outputs a starting signal to trigger the MCU to start.
5. The system of claim 4, wherein the power module further comprises a comparator, the comparator is connected to the power selection circuit and the power management chip respectively;
the comparator is used for sending a power event signal to the power management chip when power input is detected, so that the power management chip is awakened, and the power management chip sends the starting signal to the MCU so as to trigger the MCU to start.
6. The system of claim 5, wherein after the MCU is started, the MCU is configured to send a power latch signal to the power management chip and the comparator;
the power supply management chip is used for latching the system power supply according to the power supply latching signal and maintaining the running state;
the comparator is used for interrupting the output power supply event signal according to the power supply latching signal.
7. The system of claim 4, wherein the MCU is configured to set a wakeup time of the clock chip via the bus before the power management chip is turned off.
8. The system of any one of claims 1 to 7, wherein the power module further comprises a power protection circuit connected to the OBD power input interface and a battery voltage pin of the OBD connector, respectively;
the power supply protection circuit is used for filtering power supply ripples.
9. The system of claim 8, wherein the power module further comprises a DC-DC circuit connecting the power protection circuit and the OBD power input interface, respectively;
the DC-DC circuit is used for converting a power supply connected to a storage battery voltage pin of the OBD connector into an input voltage conforming to a system.
10. The system of claim 9, wherein the power module further comprises a charger, the charger being connected to the OBD power input interface and the backup power source, respectively;
the charger is used for accessing the voltage input by the OBD power input interface to charge the standby power supply.
11. The system of claim 10, wherein the backup power source comprises a battery, a battery level sensor, and a battery temperature sensor, the battery level sensor and the battery temperature sensor being connected to the MCU respectively.
12. The system of claim 1, further comprising a temperature sensor connected to the MCU, the temperature sensor configured to detect a temperature of the system.
13. An OBD on-board monitoring terminal comprising the OBD power control management system of any of claims 1 to 12.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357337.3A CN111443644A (en) | 2020-04-29 | 2020-04-29 | OBD power control management system and OBD monitor terminal |
| PCT/CN2021/088747 WO2021218744A1 (en) | 2020-04-29 | 2021-04-21 | Obd power supply control and management system and obd monitoring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357337.3A CN111443644A (en) | 2020-04-29 | 2020-04-29 | OBD power control management system and OBD monitor terminal |
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| CN111443644A true CN111443644A (en) | 2020-07-24 |
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| CN202010357337.3A Pending CN111443644A (en) | 2020-04-29 | 2020-04-29 | OBD power control management system and OBD monitor terminal |
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| Country | Link |
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| CN (1) | CN111443644A (en) |
| WO (1) | WO2021218744A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218744A1 (en) * | 2020-04-29 | 2021-11-04 | 深圳市道通科技股份有限公司 | Obd power supply control and management system and obd monitoring terminal |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116513082B (en) * | 2023-02-06 | 2023-10-13 | 江西新画卷科技有限公司 | Automatic switching device and method for power supply of OBD intelligent equipment |
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| WO2021218744A1 (en) | 2021-11-04 |
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