CN113949148A - OBU system capable of being externally powered and charged - Google Patents
OBU system capable of being externally powered and charged Download PDFInfo
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- CN113949148A CN113949148A CN202111026453.8A CN202111026453A CN113949148A CN 113949148 A CN113949148 A CN 113949148A CN 202111026453 A CN202111026453 A CN 202111026453A CN 113949148 A CN113949148 A CN 113949148A
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- rechargeable battery
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- 238000000034 method Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 101001093748 Homo sapiens Phosphatidylinositol N-acetylglucosaminyltransferase subunit P Proteins 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- 230000006855 networking Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Engineering & Computer Science (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明公开了一种可外部供电及充电的OBU系统，其特征在于，包括：第一OBU系统或第二OBU系统；第一OBU系统包括：依次连接的第一外置供电接口、第一电源管理芯片、第一可充电电池、第一开关电路和集成有太阳能充电管理功能的第一MCU，第一MCU还连接太阳能电池板和第一可充电电池；第二OBU系统包括：依次连接的第二外置供电接口、第二电源管理芯片、第二可充电电池、第二开关电路和第二MCU，第二电源管理芯片还连接太阳能电池板和第二MCU。本发明在电路中增加外置供电接口、电源管理芯片及开关电路，没有复杂的逻辑，无需系统程序控制，对OBU的成本影响较小，即可有效的解决因高频次使用而造成的OBU电池寿命短的问题。
The invention discloses an OBU system capable of external power supply and charging, which is characterized by comprising: a first OBU system or a second OBU system; the first OBU system comprises: a first external power supply interface, a first power supply connected in sequence A management chip, a first rechargeable battery, a first switch circuit and a first MCU integrated with a solar charge management function, the first MCU is also connected to the solar panel and the first rechargeable battery; the second OBU system includes: Two external power supply interfaces, a second power management chip, a second rechargeable battery, a second switch circuit and a second MCU, the second power management chip is also connected to the solar panel and the second MCU. The invention adds an external power supply interface, a power management chip and a switch circuit to the circuit, has no complex logic, does not need system program control, and has little impact on the cost of the OBU, and can effectively solve the OBU caused by high-frequency use. Short battery life issue.
Description
Technical Field
The invention relates to the field of intelligent transportation, in particular to an OBU system capable of being externally powered and charged.
Background
ETC is short for electronic toll collection system, and the main function of ETC is to carry out background settlement processing with banks through special short-range communication DSRC between a vehicle-mounted electronic tag OBU installed on a vehicle windshield and an RSU antenna on an ETC lane of a toll station by utilizing a computer networking technology, so that the purpose that vehicles can pay road and bridge fees without parking through a road and bridge toll station is achieved.
Along with the continuous promotion of OBU's loading rate, the frequency of use of OBU on the freight train is obviously higher than normal vehicle, and from 2020, the freight train needs weigh earlier before getting into the highway, and in the in-process of weighing, the OBU is in RSU antenna below all the time, and the OBU is in long-time not dormant state. The power consumption of single transaction of the OBU is 45mAs, the dormant current is 15uA, the Bluetooth inventory current is 11mA (10 s of single inventory is completed, two times of inventory are carried out every month), the daily transaction of the truck is about 50 times, 5-10 km/h passes through an RSU antenna area with the length of about 10m in the weighing process, then the weighing is about 7.2s in the RSU antenna area, the single transaction is 250ms per month, the transaction is 28 times in the RSU antenna area, and the total number of the whole-day transaction is about 80 times. The monthly power consumption of the truck is as follows: 30 {24 × 3600 × 0.015 (sleep power consumption) +80 × 45mAs (transaction power consumption) +24 × 3600 × 0.001 (rechargeable battery self-discharge) } +2 × 10 × 11mAs (bluetooth battery charge consumption) ═ 41.6 mAh. If the rechargeable battery has a capacity of 1200mAh, the service life of the rechargeable battery cannot be maintained for 5 years even if the rechargeable battery is charged by solar energy, and the service life of the rechargeable battery is 1200 x 80%/41.6 month to 23 months according to 80% of available electricity. Based on the above, the use of the OBU on the truck has higher demand for battery capacity, and under the trend that the OBU is gradually miniaturized in size, the power supply mode of the solar energy and the rechargeable battery is difficult to meet the scene of high-frequency use. And when the OBU appears the low-voltage condition, can't normally pass through high-speed access & exit again, must arrive appointed maintenance point and change the OBU, bring very big inconvenience for the vehicle.
In view of the above problems, the prior art provides a technical solution to increase the capacity of the rechargeable battery, but the technical solution is limited by the current technology of the rechargeable battery, and the increase of the capacity inevitably leads to the increase of the size of the rechargeable battery and the increase of the cost on the premise of ensuring the safety. The OBU which is miniaturized and low in cost is difficult to use a large-capacity battery as a method for solving the problem of prolonging the service life of the battery.
The prior art still provides a technical scheme, charging capacitor + lithium cell + solar panel promptly, but, this scheme can solve the problem that long-time electric quantity power supply is not enough really, but has the drawback, mainly, when OBU equipment is long-term storage in the warehouse, equipment can only return the producer and carry out the battery change. Moreover, if the equipment installed on the client vehicle is parked in a light-resistant environment for a long time or used in a cold northern area, the illumination is insufficient, and the aim of timely replenishing the electric quantity due to the electric quantity exhaustion of the battery cannot be fulfilled.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide an OBU system capable of being externally powered and charged, which can effectively solve the problem of short service life of the OBU battery due to high frequency usage.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an OBU system that can be externally powered and charged, comprising: a first OBU system or a second OBU system;
the first OBU system comprises: the solar charging management system comprises a first external power supply interface, a first power management chip, a first rechargeable battery, a first switching circuit and a first MCU integrated with a solar charging management function, wherein the first external power supply interface, the first power management chip, the first rechargeable battery, the first switching circuit and the first MCU are sequentially connected;
when the first rechargeable battery is in low power, a power supply is accessed through the first external power supply interface, the first rechargeable battery is charged while the system is powered through the first power management chip, and in the charging process, if the first switch circuit is switched off, the first rechargeable battery does not supply power to the system;
the second OBU system comprises: the second external power supply interface, the second power management chip, the second rechargeable battery, the second switching circuit and the second MCU are sequentially connected, and the second power management chip is also connected with the solar cell panel and the second MCU;
when the second rechargeable battery is in low power, the second external power supply interface is connected to a power supply, the second rechargeable battery is charged while the system is powered by the second power management chip, and in the charging process, if the second switch circuit is switched off, the second rechargeable battery does not supply power to the system.
Further, the OBU system as described above, the first switching circuit comprising: the drain electrode of the PMOS tube is connected with the anode of the first rechargeable battery, the grid electrode of the PMOS tube is connected with one end of the first resistor and the first external power supply interface, the source electrode of the PMOS tube is connected with the first MCU, and the cathode of the first rechargeable battery and the other end of the first resistor are both grounded;
when the first external power supply interface does not supply power, the first PMOS tube is conducted, and the first rechargeable battery supplies power to the system;
when power is input into the first external power supply interface, the first PMOS tube is turned off, the first rechargeable battery does not supply power to the system, and the first external power supply interface supplies power to the system through the first power management chip and charges the first rechargeable battery.
Further, the OBU system as described above, the second switching circuit comprising: the drain electrode of the PMOS tube is connected with the anode of the second rechargeable battery, the grid electrode of the PMOS tube is connected with two ends of the second resistor and the second external power supply interface, the source electrode of the PMOS tube is connected with the second MCU, and the cathode of the second rechargeable battery and the other two ends of the second resistor are both grounded;
when the second external power supply interface is in non-power supply input, the second PMOS tube is conducted, and the second rechargeable battery supplies power to the system;
when power is input into the second external power supply interface, the second PMOS tube is switched off, the second rechargeable battery does not supply power to the system, and the second external power supply interface supplies power to the system through the second power management chip and charges the second rechargeable battery.
Further, in the OBU system described above, the first MCU is further connected to other peripheral units.
Further, in the OBU system described above, the second MCU is further connected to other peripheral units.
Further, according to the OBU system, the first external power supply interface is connected to a 12V/24V or 5V power supply.
Further, according to the OBU system, the second external power supply interface is connected to a 12V/24V or 5V power supply.
Further, according to the OBU system, the first external power supply interface is a USB or Type-C interface commonly used.
Further, according to the OBU system, the second external power supply interface adopts the commonly used USB and Type-C.
The invention has the beneficial effects that: the invention achieves the purposes of low cost and effectiveness by introducing an external power supply port, a power management chip and a switch circuit in a hardware circuit and not increasing control logic with complicated programs, thereby solving the problem of short service life of an OBU battery caused by high-frequency use.
Drawings
Fig. 1 is a block diagram of an OBU system with an MCU integrated with a solar charging management function according to an embodiment of the present invention;
fig. 2 is a block diagram of an OBU system in which the MCU provided in the embodiment of the present invention is not integrated with a solar charging management function;
fig. 3 is a diagram of a switch circuit provided in an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-2, an embodiment of the present invention provides an OBU system capable of being externally powered and charged, including: a first OBU system or a second OBU system.
The first OBU system includes: the solar charging management system comprises a first external power supply interface 11, a first power management chip 12, a first rechargeable battery 13, a first switch circuit 14 and a first MCU 15 integrated with a solar charging management function, wherein the first external power supply interface, the first power management chip 12, the first rechargeable battery 13, the first switch circuit 14 and the first MCU 15 are sequentially connected, and the first MCU 15 is also connected with a solar cell panel, the first rechargeable battery 13 and other external units; when the first rechargeable battery 13 is in a low power state, the first external power supply interface 11 is connected to a power supply, the first rechargeable battery 13 is charged while the system is supplied with power through the first power management chip 12, and in the charging process, if the first switch circuit 14 is turned off, the first rechargeable battery 13 does not supply power to the system.
The second OBU system includes: the second external power supply interface 21, the second power management chip 22, the second rechargeable battery 23, the second switch circuit 24 and the second MCU25 are connected in sequence, the second power management chip 22 is further connected with a solar panel, and the second MCU25 is further connected with the second power management chip 22 and other external units; when the second rechargeable battery 23 is in a low power state, the second external power supply interface 21 is connected to a power supply, the second rechargeable battery 23 is charged while the system is powered by the second power management chip 22, and in the charging process, if the second switch circuit 24 is turned off, the second rechargeable battery 23 does not supply power to the system.
Fig. 1 shows a block diagram of an OBU system (first OBU system) with an MCU integrated with a solar charging management function, and many MCUs are integrated with a solar charging management function, and can charge a rechargeable battery without being externally arranged in a circuit.
Fig. 2 shows a block diagram of an OBU system (a second OBU system) in which the MCU does not integrate a solar charging management function, and a solar charging management circuit is provided in the circuit to complete the solar charging function of the rechargeable battery. On the basis of a mature solar energy and rechargeable battery power supply scheme, an external power supply interface, a power supply management chip and a switch circuit (or only the external power supply interface and the switch circuit) are added in the circuit, when the rechargeable battery is in a low power state, a 12V/24V or 5V power supply is accessed through the external power supply interface, the rechargeable battery can be charged while the system is powered through the power supply management chip, in addition, in the charging process, the switch circuit is switched off, and the rechargeable battery does not supply power to the system.
As shown in fig. 3, the switch circuit (the first switch circuit and the second switch circuit) is composed of a PMOS transistor and a pull-down resistor, when no input is provided by external power, the PMOS transistor is turned on, and the rechargeable battery supplies power to the system; when the external power supply is input, the PMOS is switched off, the rechargeable battery does not supply power to the system, the external power supply outputs 3.6V to supply power to the system through the power management chip, and the rechargeable battery is charged at the same time.
On the basis of a mature solar and rechargeable battery power supply scheme, the system program control is not needed, an external power supply connection, a power management chip and a switch circuit are added in the circuit, no complex logic is needed, the system program control is not needed, the cost influence on the OBU is small, and the problem of short service life of the OBU battery caused by high-frequency use can be effectively solved.
The invention achieves the purposes of low cost and effectiveness by introducing an external power supply port, a power management chip and a switch circuit in a hardware circuit and not increasing control logic with complicated programs, thereby solving the problem of short service life of an OBU battery caused by high-frequency use. The external power supply interface can adopt USB, Type-C and the like commonly used, and any chargeable equipment can all connect external power supply through this scheme, reaches the purpose that low-cost power supply charges, solves the problem of in time replenishing the electric quantity.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (9)
1. An OBU system capable of being externally powered and charged, comprising: a first OBU system or a second OBU system;
the first OBU system comprises: the solar charging management system comprises a first external power supply interface, a first power management chip, a first rechargeable battery, a first switching circuit and a first MCU integrated with a solar charging management function, wherein the first external power supply interface, the first power management chip, the first rechargeable battery, the first switching circuit and the first MCU are sequentially connected;
when the first rechargeable battery is in low power, a power supply is accessed through the first external power supply interface, the first rechargeable battery is charged while the system is powered through the first power management chip, and in the charging process, if the first switch circuit is switched off, the first rechargeable battery does not supply power to the system;
the second OBU system comprises: the second external power supply interface, the second power management chip, the second rechargeable battery, the second switching circuit and the second MCU are sequentially connected, and the second power management chip is also connected with the solar cell panel and the second MCU;
when the second rechargeable battery is in low power, the second external power supply interface is connected to a power supply, the second rechargeable battery is charged while the system is powered by the second power management chip, and in the charging process, if the second switch circuit is switched off, the second rechargeable battery does not supply power to the system.
2. The OBU system of claim 1, wherein the first switching circuit comprises: the drain electrode of the PMOS tube is connected with the anode of the first rechargeable battery, the grid electrode of the PMOS tube is connected with one end of the first resistor and the first external power supply interface, the source electrode of the PMOS tube is connected with the first MCU, and the cathode of the first rechargeable battery and the other end of the first resistor are both grounded;
when the first external power supply interface does not supply power, the first PMOS tube is conducted, and the first rechargeable battery supplies power to the system;
when power is input into the first external power supply interface, the first PMOS tube is turned off, the first rechargeable battery does not supply power to the system, and the first external power supply interface supplies power to the system through the first power management chip and charges the first rechargeable battery.
3. The OBU system of claim 1, wherein the second switching circuit comprises: the drain electrode of the PMOS tube is connected with the anode of the second rechargeable battery, the grid electrode of the PMOS tube is connected with two ends of the second resistor and the second external power supply interface, the source electrode of the PMOS tube is connected with the second MCU, and the cathode of the second rechargeable battery and the other two ends of the second resistor are both grounded;
when the second external power supply interface is in non-power supply input, the second PMOS tube is conducted, and the second rechargeable battery supplies power to the system;
when power is input into the second external power supply interface, the second PMOS tube is switched off, the second rechargeable battery does not supply power to the system, and the second external power supply interface supplies power to the system through the second power management chip and charges the second rechargeable battery.
4. The OBU system according to claim 1, wherein the first MCU is further connected to other peripheral units.
5. The OBU system according to claim 1, wherein the second MCU is further connected to other peripheral units.
6. The OBU system of any of claims 1-4, wherein the first external power interface accesses a 12V/24V or 5V power source.
7. The OBU system of any of claims 1-4, wherein the second external power interface accesses a 12V/24V or 5V power supply.
8. The OBU system of any of claims 1-4, wherein the first external power interface is a commonly used USB, Type-C.
9. The OBU system of any of claims 1-4, wherein the second external power interface employs a commonly used USB, Type-C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111026453.8A CN113949148A (en) | 2021-09-02 | 2021-09-02 | OBU system capable of being externally powered and charged |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111026453.8A CN113949148A (en) | 2021-09-02 | 2021-09-02 | OBU system capable of being externally powered and charged |
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| CN210669608U (en) * | 2019-06-19 | 2020-06-02 | 北京万集科技股份有限公司 | Solar power supply circuit of OBU |
| CN112491115A (en) * | 2020-11-25 | 2021-03-12 | 四川长虹电器股份有限公司 | Power supply management circuit for standby rechargeable battery |
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2021
- 2021-09-02 CN CN202111026453.8A patent/CN113949148A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201364599Y (en) * | 2009-03-03 | 2009-12-16 | 深圳市金溢科技有限公司 | Solar-powered environment-friendly automatic charging on-board unit device |
| CN102682485A (en) * | 2011-03-14 | 2012-09-19 | 深圳市金溢科技有限公司 | Electronic on-board unit |
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