CN100392537C - Onboard power supply unit managing method - Google Patents
Onboard power supply unit managing method Download PDFInfo
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- CN100392537C CN100392537C CNB2004100175661A CN200410017566A CN100392537C CN 100392537 C CN100392537 C CN 100392537C CN B2004100175661 A CNB2004100175661 A CN B2004100175661A CN 200410017566 A CN200410017566 A CN 200410017566A CN 100392537 C CN100392537 C CN 100392537C
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- 238000000034 method Methods 0.000 title claims description 17
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 101001093748 Homo sapiens Phosphatidylinositol N-acetylglucosaminyltransferase subunit P Proteins 0.000 claims abstract 2
- 238000001914 filtration Methods 0.000 claims description 4
- 238000007726 management method Methods 0.000 abstract description 6
- 230000004913 activation Effects 0.000 abstract 5
- 238000004891 communication Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910006762 Li—SOCl2 Inorganic materials 0.000 description 1
- SESRESPLYXIWKJ-UHFFFAOYSA-N [Cl].S(O)(O)=O.[Li] Chemical compound [Cl].S(O)(O)=O.[Li] SESRESPLYXIWKJ-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000002618 waking effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The present invention discloses a power supply management method for on-board units. Batteries continuously supply power to a wake-up circuit and a safety check circuit in an MCU and a 5.8G microwave module; the OBU has two operation modes, namely, a sleep mode and an activation mode; under the activation mode, the MCU can control the OBU to enter the sleep mode; under the sleep mode, the MCU controls the OBU to enter the activation mode through activation interruption; power supplies of an IC card read-write module, a DSRC chip, a man-machine interface circuit, a modulation-demodulation circuit in the 5.8G microwave module and a low voltage detection circuit in the MCU start to supply power only under the activation mode. The present invention can effectively raise the availability ratio and load capability of batteries, reduce the stand-by electric current of the products, and prolong the service life of products.
Description
Technical field
The present invention relates to the method for managing power supply of wireless telecommunications system in a kind of intelligent transportation field, particularly relate to a kind of implementation method of board units electric power management circuit.
Background technology
In highway tolling system, non-parking charge (ETC) because its operation is convenient and efficient, more and more is subjected to the favor and the popularization of international market as a kind of novel charge method at present.This charge method is generally finished identification, charge and the statistical work by vehicle on the track automatically by means of infrared or microwave technology, and charge efficient height can solve the situation that charge station's vehicle blocks up effectively.ETC still is in the starting stage at home, but will become the inexorable trend of future development.
In the ETC system, OBU (On Board Unit board units) generally adopts powered battery, and selects lithium-sulphurous acid chlorine (Li-SOCl2 Battery) battery of not reproducible charging for use.It has following characteristics: discharge is pressed high; Discharge curve is very smooth; The low-temperature operation function admirable; Year self-discharge rate is low; Storage life is long.Adopt this powered battery to save the worry of battery recharge, but also have problems:
1. the battery utilization factor is not high: the consumption of back along with battery capacity works long hours, powered battery voltage reduces, even be lower than some device or module, the minimum of IC-card module for reading and writing for example, yet this moment, battery still existed a large amount of capacity to be not used, and caused the battery capacity utilization factor to reduce.
2. carrying load ability is poor: for large current load, IC-card module for reading and writing for example is after DSRC (Dedicated Short Range Communications) chip etc. is started working, the cell voltage amplitude of oscillation is bigger, can not guarantee constant voltage output, to making some device or module, for example the IC-card module for reading and writing can't operate as normal.
3. standby current (electric current under the sleep pattern) is excessive: OBU overwhelming majority time service is in sleep pattern in the whole life of OBU, yet the working current during the sleep pattern is difficult to again be controlled in the scope that is allowed, therefore cause the waste for no reason of the big energy of battery, thus the serviceable life of reducing product.
Summary of the invention
For solving the existing in prior technology problem, the invention provides a kind of method for managing power supply of board units, it can effectively improve the utilization factor and the carrying load ability of battery, reduces the standby current of product, strengthens the serviceable life of product.
For solving the problems of the technologies described above, the method for managing power supply of board units of the present invention is MCU (microcontroller), the wake-up circuit in the 5.8G microwave module, safety check electric routing battery continued power in the board units; Described OBU has two kinds of mode of operations, sleep pattern and enable mode, and under enable mode, MCU can make it enter sleep pattern by software instruction, and under sleep pattern, MCU can make it enter enable mode by the interruption that activates; The power supply of the modulation/demodulation circuit in IC-card module for reading and writing, DSRC chip, man-machine interface circuit, the 5.8G microwave module and the low-voltage testing circuit of MCU inside only just begins power supply under enable mode.
The power supply of IC-card module for reading and writing, DSRC chip is controlled by the DC/DC circuit, MCU realizes the switch control of DC/DC circuit by the work enable pin of its delivery outlet control DC/DC circuit, when the unlatching DC/DC of MCU pin output high level, then the DC/DC circuit begins power supply, and output 3.3V voltage, when the unlatching DC/DC of MCU pin output low level, then the DC/DC circuit turn-offs and stops voltage output.
The present invention adopts software instruction to make MCU before entering sleep pattern it be opened RF output pin output high level, and all the other output pin output low levels are to prevent that the MCU output pin is to the caused power consumption of the power supply of power cutoff chip; Adopt software instruction to make to wake interrupt request singal up and the corresponding MCU input pin of safety check interrupt request singal interrupt function before entering sleep pattern enables, so that MCU can be under sleep pattern be waken up by interrupting; At enable mode, MCU is for the module that can select the visit of inquiry mode and interrupt mode, and for example interrupt mode is adopted in the operation of DSRC chip and IC-card module for reading and writing, the power consumption that the bus change is caused when reducing inquiry mode to outside module accesses; On hardware circuit, adopt the DC/DC circuit to give the power supply of the large current loads such as modulation-demodulation circuit in IC-card module for reading and writing, DSRC chip, man-machine interface circuit, the 5.8G microwave module, improved carrying load ability and the battery utilization factor of OBU effectively; Adopt the analog to digital converter (AD) of MCU inside and only under enable mode, carry out battery voltage detection, with further reduction hardware cost and power consumption.
In sum, the method for managing power supply of board units of the present invention is with the core devices of MCU as power management, the method that adopts hardware circuit and software control to combine, the utilization factor and the carrying load ability of battery have been improved effectively, reduce the standby current of product, strengthened the serviceable life of product.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Accompanying drawing is the structural drawing of the method for managing power supply of board units of the present invention.
Embodiment
As shown in the figure, the method for managing power supply of board units of the present invention is responsible for the OBU all functions are carried out unified management by MCU U8, comprising power management.For the power management of OBU, but MCU mainly realizes by the power switch of the control mode switch of OBU and power cutoff chip or module.
The mode of operation of OBU is controlled by MCU, and described OBU has two kinds of mode of operations, sleep pattern and enable mode, under enable mode, MCU can make it enter sleep pattern by software instruction, and under sleep pattern, MCU can make it enter enable mode by the interruption that activates.For realizing OBU waking up from the sleep pattern to the enable mode, OBU is before entering sleep pattern, MCU enables the input pin interrupt function of wake-up interrupts request signal and the corresponding MCU of safety check interrupt request singal, so that MCU can wake up by the interruption that activates under sleep pattern.In addition, OBU is before entering sleep pattern, and the unlatching RF output pin of MCU is exported high level, and all the other output pin output low levels are to prevent that the MCU output pin is to the caused power consumption of the power supply of power cutoff chip or module.Under enable mode, MCU adopts interrupt mode for the operation of the module that can select the visit of inquiry mode and interrupt mode, the power consumption that the bus change is caused when reducing inquiry mode to outside module accesses, for example the interrupt request of MCU by DSRC interrupt request singal and IC-card module interrupt request singal realizes the interruption visit to DSRC and IC module for reading and writing.The power supply of the modulation/demodulation circuit among IC-card module for reading and writing U5, DSRC chip U6, man-machine interface circuit U 9, the 5.8G microwave module U3 and the low-voltage testing circuit of MCU inside only just begins power supply under enable mode.
But the power switch of power cutoff chip or module is MCU to be controlled by delivery outlet.The power supply of IC-card module for reading and writing U5, DSRC chip U6 is by 7 controls of DC/DC circuit U.MCU realizes the switch control of DC/DC circuit U 7 by the work enable pin of its delivery outlet control DC/DC circuit U 7.When the unlatching DC/DC of MCU pin output high level, then DC/DC circuit U 7 begins power supply, and output 3.3V voltage; When the unlatching DC/DC of MCU pin output low level, then DC/DC circuit U 7 is turn-offed and is stopped voltage output.
The power supply of man-machine interface circuit U 9 is controlled jointly by DC/DC circuit and switching tube Q2, the first step, the unlatching DC/DC pin output high level of MCU makes the DC/DC circuit that voltage output be arranged, second step, the unlatching man-machine interface pin output high level of MCU, switching tube Q2 is opened, above any one does not satisfy in two steps, the power supply of then man-machine interface circuit U 9 disconnects.
5.8G the power supply of the modulation/demodulation circuit among the microwave module U3 is by switching tube Q1 control, when the unlatching RF of MCU pin output low level, then switching tube Q1 opens, the power connection of modulation/demodulation circuit among the 5.8G microwave module U3; When the unlatching RF of MCU pin output high level, then switching tube Q1 closes, and the power supply of modulation/demodulation circuit disconnects among the 5.8G microwave module U3.
The present invention turn-offs before adopting software instruction to make DC/DC circuit, switching tube Q1, Q2 enter sleep pattern, stop power supply, to reduce the OBU standby current to modulation-demodulation circuit among IC-card module for reading and writing, DSRC chip, man-machine interface circuit and the 5.8G microwave module U3.
In the ETC system, the OBU most of the time all is in sleep pattern, has only after the vehicle that OBU equipment is installed enters roadside equipment (RSU) transaction communications zone, and ability and RSU carry out communication.Therefore, require OBU to have the function whether the identification vehicle enters the RSU communications zone, this function realizes by the wake-up circuit among the 5.8G microwave module U3; In addition, also require function that OBU has a safety detection to prevent that OBU internal security data from illegally being stolen, this function realizes by safety check circuit U 2.The realization of two kinds of functions of the above OBU all has randomness, and therefore, this two parts functional circuit need be by battery U1 continued power.In addition, as the core devices MCU of whole OBU, also by battery U1 continued power.
The detection of cell voltage adopts the analog to digital converter (AD) of MCU inside to realize.MCU realizes the control that AD changes by the corresponding register of this AD converter of visit, and transformation result is converted to the correspondent voltage value.The detection of cell voltage is only carried out under enable mode, and before entering sleep pattern, the power supply that is turn-offed described AD converter by MCU is with further reduction OBU standby current.
For removing 5.8G microwave module U3 power supply, carry out filtering at the power input increase filtering circuit U4 of 5.8G microwave module U3, effectively 5.8G microwave module U3 power supply is isolated with the low-frequency channel power supply with influencing each other between the low-frequency power.
Claims (5)
1. MCU, the wake-up circuit in the 5.8G microwave module, safety check electric routing battery continued power in the method for managing power supply of a board units, board units; Described board units has two kinds of mode of operations, sleep pattern and enable mode, and under enable mode, MCU can control board units and enter sleep pattern, and under sleep pattern, MCU can make board units enter enable mode by the interruption that activates; It is characterized in that: the power supply of the modulation/demodulation circuit in IC-card module for reading and writing, DSRC chip, man-machine interface circuit, the 5.8G microwave module and the low-voltage testing circuit of MCU inside only just begins power supply under enable mode.
2. the method for managing power supply of board units as claimed in claim 1, it is characterized in that: before entering sleep pattern, MCU opens the output pin output high level of RF, all the other output pin output low levels, and MCU enables wake-up interrupts request signal and the corresponding interruption input pin of safety check interrupt request singal interrupt function; At enable mode, MCU adopts interrupt mode for the operation of the module that can select the visit of inquiry mode and interrupt mode.
3. the method for managing power supply of board units as claimed in claim 1, it is characterized in that: the power supply of man-machine interface circuit is controlled jointly by DC/DC circuit and switching tube Q2, the first step, the unlatching DC/DC pin output high level of MCU makes the DC/DC circuit that voltage output be arranged; In second step, the unlatching man-machine interface pin of MCU output high level is opened switching tube Q2, above any one does not satisfy in two steps, then the power supply of man-machine interface circuit disconnects.
4. the method for managing power supply of board units as claimed in claim 1, it is characterized in that: the power supply of the modulation/demodulation circuit in the 5.8G microwave module is controlled by switching tube Q1, when the unlatching RF of MCU pin output low level, then switching tube Q1 opens, the power connection of modulation/demodulation circuit in the 5.8G microwave module; When the unlatching RF of MCU pin output high level, then switching tube Q1 closes, and the power supply of modulation/demodulation circuit disconnects in the 5.8G microwave module.
5. the method for managing power supply of board units as claimed in claim 1 is characterized in that: the detection of cell voltage adopts the analog to digital converter of MCU inside to realize, and only carries out voltage detecting under enable mode; 5.8G the power supply of microwave module is imported wave circuit filtering after filtration, effectively 5.8G microwave module power supply is isolated with the low-frequency channel power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100175661A CN100392537C (en) | 2004-04-08 | 2004-04-08 | Onboard power supply unit managing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100175661A CN100392537C (en) | 2004-04-08 | 2004-04-08 | Onboard power supply unit managing method |
Publications (2)
| Publication Number | Publication Date |
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| CN1680895A CN1680895A (en) | 2005-10-12 |
| CN100392537C true CN100392537C (en) | 2008-06-04 |
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| CNB2004100175661A Expired - Lifetime CN100392537C (en) | 2004-04-08 | 2004-04-08 | Onboard power supply unit managing method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101030434B (en) * | 2006-02-27 | 2010-05-12 | 比亚迪股份有限公司 | Vehicle video/audio controlling system |
| CN101364740B (en) * | 2007-08-07 | 2013-05-22 | 奇瑞汽车股份有限公司 | Control method for hybrid powered automobile |
| JP5093777B2 (en) * | 2008-03-31 | 2012-12-12 | 本田技研工業株式会社 | Vehicle state management system, vehicle, vehicle state management program |
| CN102208134A (en) * | 2010-03-31 | 2011-10-05 | 中兴智能交通（无锡）有限公司 | Method and system for highway information service |
| CN101872995B (en) * | 2010-05-17 | 2012-08-15 | 深圳市金溢科技有限公司 | Electronic vehicle unit for automatic charging |
| CN102436222B (en) * | 2011-07-29 | 2014-05-07 | 中联重科股份有限公司 | Power supply management method, device and system of remote service terminal and engineering machine |
| CN103164877B (en) * | 2011-12-13 | 2015-07-08 | 北京北大千方科技有限公司 | Vehicle-mounted terminal and power management method of vehicle-mounted terminal |
| CN111292431A (en) * | 2018-12-06 | 2020-06-16 | 上海搜林信息技术有限公司 | Vehicle-mounted unit operation method and vehicle-mounted unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248105A (en) * | 1998-09-11 | 2000-03-22 | 三菱电机株式会社 | Vehicle-mounted device for charge system on toll highway |
| US6166649A (en) * | 1999-04-12 | 2000-12-26 | Mitsubishi Denki Kabushiki Kaisha | DSRC on-vehicle device |
| US20020177931A1 (en) * | 2001-05-24 | 2002-11-28 | Tatsuya Iwasaki | On-board control system and method for vehicles |
| CN2595065Y (en) * | 2002-12-31 | 2003-12-24 | 上海华虹集成电路有限责任公司 | Power supply circuit of portable product |
| JP2004054416A (en) * | 2002-07-17 | 2004-02-19 | Matsushita Electric Ind Co Ltd | Dsrc on-vehicle equipment |
-
2004
- 2004-04-08 CN CNB2004100175661A patent/CN100392537C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248105A (en) * | 1998-09-11 | 2000-03-22 | 三菱电机株式会社 | Vehicle-mounted device for charge system on toll highway |
| US6166649A (en) * | 1999-04-12 | 2000-12-26 | Mitsubishi Denki Kabushiki Kaisha | DSRC on-vehicle device |
| US20020177931A1 (en) * | 2001-05-24 | 2002-11-28 | Tatsuya Iwasaki | On-board control system and method for vehicles |
| JP2004054416A (en) * | 2002-07-17 | 2004-02-19 | Matsushita Electric Ind Co Ltd | Dsrc on-vehicle equipment |
| CN2595065Y (en) * | 2002-12-31 | 2003-12-24 | 上海华虹集成电路有限责任公司 | Power supply circuit of portable product |
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| CN1680895A (en) | 2005-10-12 |
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