CN105703023A - Charging-discharging method and apparatus for standby battery of vehicle-mounted terminal - Google Patents
Charging-discharging method and apparatus for standby battery of vehicle-mounted terminal Download PDFInfo
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- CN105703023A CN105703023A CN201410709283.7A CN201410709283A CN105703023A CN 105703023 A CN105703023 A CN 105703023A CN 201410709283 A CN201410709283 A CN 201410709283A CN 105703023 A CN105703023 A CN 105703023A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
Embodiments of the invention disclose a charging-discharging method and apparatus for a standby battery of a vehicle-mounted terminal. The charging method for the standby battery of the vehicle-mounted terminal comprises the steps that when the voltage of the standby battery of the vehicle-mounted terminal reaches a charging threshold value, the standby battery is initially charged by a first current; the charging voltage of the standby battery in the charging process is monitored; when the charging voltage is boosted to the voltage threshold value for switching the charging current, the standby battery is continuously charged by a second current, wherein the second current numerical value is less than the first current numerical value. By adoption of the charging method, the condition of over-charge or over-discharge of the standby battery can be avoided, so that the service life of the standby battery is prolonged.
Description
Technical field
The present invention relates to car networking technology field, particularly relate to a kind of car-mounted terminal reserve battery charging/discharging thereof and device。
Background technology
Electric automobile refers to vehicle power for power, drives wheels travel with motor, meets the vehicle of road traffic, security legislation requirements。Owing to electric automobile uses vehicle power to be powered, and non-exhaust emission in use procedure, its prospect is extensively had an optimistic view of。
In order to realize for the monitoring of various performance parameters in electric automobile during traveling process, car-mounted terminal is generally installed in electric automobile, to monitor running state parameter and the positional information of electric automobile in real time, and is uploaded to monitor supervision platform。
Chargeable reserve battery is requisite parts on car-mounted terminal。Under normal circumstances, the power supply of car-mounted terminal from storage battery built-in on electric automobile, car-mounted terminal by the system interface that is connected with vehicle from storage battery power taking。When vehicle power supply does not have electric, reserve battery enables, and car-mounted terminal can continue to keep the data communication of a period of time with monitor supervision platform。
But, owing to current electric automobile is still in developmental stage, its technical development is also immature。In the use procedure of reserve battery, it may occur however that the situation that charge and discharge are excessive, thus affecting the life-span of reserve battery。
Summary of the invention
The embodiment of the present invention provides a kind of car-mounted terminal reserve battery charging/discharging thereof and device, it is possible to avoid the occurrence of the situation that reserve battery charge and discharge are excessive, extend the life-span of reserve battery。
In order to solve above-mentioned technical problem, the embodiment of the invention discloses following technical scheme:
The present invention provides a kind of car-mounted terminal reserve battery charging method, including:
When car-mounted terminal backup battery voltage reaches charge threshold, with the first electric current, described reserve battery is carried out initial charge；
The charging voltage of reserve battery described in monitoring charging process；
When described charging voltage rises to the voltage threshold of switching charging current, with the second electric current, described reserve battery being continued charging, described second current values is less than described first current values。
Further, also include: when described charging voltage rises to charging termination threshold value, stop described reserve battery is charged。
On the other hand, the present invention also provides for a kind of car-mounted terminal backup batteries discharge method, including:
When car-mounted terminal reserve battery starts to discharge, the discharge voltage of reserve battery described in monitoring discharge process；
When described discharge voltage is down to first threshold, only maintain the power supply to described car-mounted terminal internal clock module of the described reserve battery。
Further, also include: when described discharge voltage continues to be down to Second Threshold, interrupt the power supply to described clock module of the described reserve battery。
Further, described car-mounted terminal reserve battery starts electric discharge, including:
When the vehicle stall residing for described car-mounted terminal, when described car-mounted terminal needs to enter resting state, described reserve battery starts electric discharge。
Another further aspect, the present invention also provides for a kind of car-mounted terminal reserve battery charging device, including:
First charging module, for when car-mounted terminal backup battery voltage reaches charge threshold, carrying out initial charge with the first electric current to described reserve battery；
Charging voltage monitoring module, for monitoring the charging voltage of reserve battery described in charging process；
Second charging module, for when described charging voltage rises to the voltage threshold switching charging current, described reserve battery being continued charging with the second electric current, described second current values is less than described first current values。
Further, also include: module is closed in charging, for when described charging voltage rises to charging termination threshold value, stopping described reserve battery is charged。
Another aspect, the present invention also provides for a kind of car-mounted terminal backup batteries discharge device, including:
Discharge voltage monitoring module, for when car-mounted terminal reserve battery starts to discharge, monitoring the discharge voltage of reserve battery described in discharge process；
Control of discharge module, for when described discharge voltage is down to first threshold, only maintaining the power supply to described car-mounted terminal internal clock module of the described reserve battery。
Further, also include: module is closed in electric discharge, for when described discharge voltage continues to be down to Second Threshold, interrupting the power supply to described clock module of the described reserve battery。
Further, when the vehicle stall residing for described car-mounted terminal, when described car-mounted terminal needs to enter resting state, described reserve battery starts electric discharge。
In the embodiment of the present invention, when car-mounted terminal reserve battery needs to charge, not adopt fixed current to be charged, but when initial charge, adopt the first bigger electric current that reserve battery is charged；Meanwhile, in charging process, the charging voltage of reserve battery is monitored, when this charging voltage rises to the voltage threshold of switching charging current, continues reserve battery is charged with the second less electric current。Owing to initial charge current matches with the voltage in reserve battery charging process, it is possible to avoid the situation occurring charging excessive in reserve battery charging process, extend the life-span of reserve battery。
Additionally, when car-mounted terminal reserve battery needs to discharge, discharge voltage in backup batteries discharge process is monitored, when reaching the voltage threshold preset, reserve battery only provides the power supply to car-mounted terminal internal clock module, cut off the power supply of other functional modules in car-mounted terminal so that reserve battery can retain enough battery electric quantities, it is ensured that the continuity of car-mounted terminal clock simultaneously。Simultaneously, it is prevented that the situation that backup batteries discharge is excessive occurs, the life-span of reserve battery is extended。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, for those of ordinary skills, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is a kind of car-mounted terminal reserve battery charging method schematic flow sheet provided by the invention；
Fig. 2 is another kind of car-mounted terminal reserve battery charging method schematic flow sheet provided by the invention；
Fig. 3 is a kind of car-mounted terminal backup batteries discharge method flow schematic diagram provided by the invention；
Fig. 4 is another kind of car-mounted terminal backup batteries discharge method flow schematic diagram provided by the invention；
Fig. 5 is a kind of mounted terminal reserve battery charging device structural representation provided by the invention；
Fig. 6 is another kind of mounted terminal reserve battery charging device structural representation provided by the invention；
Fig. 7 is a kind of mounted terminal backup batteries discharge apparatus structure schematic diagram provided by the invention；
Fig. 8 is another kind of mounted terminal backup batteries discharge apparatus structure schematic diagram provided by the invention；
Fig. 9 show power selection circuit schematic diagram provided by the invention；
Figure 10 show car-mounted terminal reserve battery charge-discharge control circuit schematic diagram provided by the invention；
Figure 11 show car-mounted terminal backup batteries discharge cutoff control circuit schematic diagram provided by the invention；
Figure 12 show the ON-OFF control circuit schematic diagram that car-mounted terminal reserve battery provided by the invention is powered to each functional module。
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the technical scheme in the embodiment of the present invention, and it is understandable to enable the above-mentioned purpose of the embodiment of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, technical scheme in the embodiment of the present invention is described in further detail。
Providing a kind of car-mounted terminal reserve battery charging method in the embodiment of the present invention, idiographic flow is as it is shown in figure 1, may include that
Step 101, when car-mounted terminal backup battery voltage reaches charge threshold, with the first electric current, reserve battery is carried out initial charge。
In the embodiment of the present invention, the charge threshold of preset car-mounted terminal reserve battery, namely reserve battery starts the voltage threshold of charging, when the voltage of reserve battery reaches charge threshold, starts reserve battery is charged, and now, charging current is the first electric current。
The charging voltage of reserve battery in step 102, monitoring charging process。
In the embodiment of the present invention, it is necessary to be monitored for the charging voltage of reserve battery in charging process。This is because, in the embodiment of the present invention, the charging current adopted in charging process is associated with the charging voltage of reserve battery。In charging process, when the charging voltage of reserve battery changes, the charging current adopted also changes accordingly。
Step 103, when charging voltage rise to switching charging current voltage threshold time, with the second electric current to reserve battery continue charging, the second current values is less than the first current values。
In the embodiment of the present invention, for reserve battery, the voltage threshold of preset switching charging current, it may be assumed that need to switch the magnitude of voltage that during charging current, reserve battery is corresponding。When the charging voltage of reserve battery reaches this voltage threshold, charging current will switch。
Specifically, being found by charging voltage monitoring, when the voltage of reserve battery rises to the voltage threshold of switching charging current, then with the second electric current, reserve battery being continued charging, now, the second current values should be less than the first current values。Switched by charging current so that when the charging voltage of reserve battery rises to the voltage threshold of switching charging current, continue reserve battery is charged by the second electric current little compared with initial charge current。
In the embodiment of the present invention, when car-mounted terminal reserve battery needs to charge, not adopt fixed current to be charged, but when initial charge, adopt the first bigger electric current that reserve battery is charged；Meanwhile, in charging process, the charging voltage of reserve battery is monitored, when this charging voltage rises to the voltage threshold of switching charging current, continues reserve battery is charged with the second less electric current。Owing to initial charge current matches with the voltage in reserve battery charging process, it is possible to avoid the situation occurring charging excessive in reserve battery charging process, extend the life-span of reserve battery。
In the flow process shown in Fig. 2, car-mounted terminal reserve battery charging method can include step performed below:
Step 101, when car-mounted terminal backup battery voltage reaches charge threshold, with the first electric current, reserve battery is carried out initial charge。
The charging voltage of reserve battery in step 102, monitoring charging process。
Step 103, when charging voltage rise to switching charging current voltage threshold time, with the second electric current to reserve battery continue charging, the second current values is less than the first current values。
Step 104, when charging voltage rises to charging termination threshold value, stop to reserve battery charge。
In this embodiment, the voltage threshold of reserve battery during preset stopping charging, it may be assumed that charging termination threshold value。When the charging voltage of reserve battery rises to charging termination threshold value, represent that reserve battery current electric quantity fills with, it is necessary to stop reserve battery being charged。
Said process describes the charging process of car-mounted terminal reserve battery, below the discharge process of car-mounted terminal reserve battery is described in detail。
Fig. 3 show the charging method embodiment of a car-mounted terminal reserve battery provided by the invention, it is possible to include step performed below:
Step 301, when car-mounted terminal reserve battery starts to discharge, the discharge voltage of reserve battery in monitoring discharge process。
In the embodiment of the present invention, under normal circumstances, the power supply of car-mounted terminal from storage battery built-in on electric automobile, car-mounted terminal by the system interface that is connected with vehicle from storage battery power taking。When vehicle power supply does not have electric, reserve battery enables, and car-mounted terminal can continue to keep the data communication of a period of time with monitor supervision platform。Such as: after electric automobile is flame-out, before car-mounted terminal needs entrance resting state, vehicle termination needs to continue to and the monitor supervision platform data communication of 3 minutes, in order to state parameter interior during this period of time after monitor supervision platform continuation monitoring electric automobile is flame-out。
When car-mounted terminal needs to be powered with reserve battery, namely reserve battery starts electric discharge。In the discharge process of reserve battery, it is necessary to the discharge voltage of monitor in real time reserve battery。
Step 302, when discharge voltage is down to first threshold, only maintain the reserve battery power supply to car-mounted terminal internal clock module。
It should be noted that reserve battery is in discharge process, internal electricity can gradually decrease along with discharge process。For car-mounted terminal, when the external power source of car-mounted terminal is stopped power supply, in order to ensure the normal use of car-mounted terminal, at least need to keep the clock signal of car-mounted terminal。Therefore, the first threshold of backup batteries discharge voltage is set, when the discharge voltage of reserve battery is down to this first threshold, represent that reserve battery cannot ensure to continue the power supply to other functional modules of car-mounted terminal inside, it is only capable of the power supply preferentially maintained car-mounted terminal internal clock module, to keep the clock signal of car-mounted terminal。Now, reserve battery, to cutting off the power supply of other functional modules in car-mounted terminal, only provides the power supply to car-mounted terminal internal clock module。
In the embodiment of the present invention, when car-mounted terminal reserve battery needs to discharge, discharge voltage in backup batteries discharge process is monitored, when reaching the voltage threshold preset, reserve battery only provides the power supply to car-mounted terminal internal clock module, cut off the power supply of other functional modules in car-mounted terminal so that reserve battery can retain enough battery electric quantities, it is ensured that the continuity of car-mounted terminal clock simultaneously。Simultaneously, it is prevented that the situation that backup batteries discharge is excessive occurs, the life-span of reserve battery is extended。
Fig. 4 show the charging method embodiment of a car-mounted terminal reserve battery provided by the invention, it is possible to include step performed below:
Step 301, when car-mounted terminal reserve battery starts to discharge, the discharge voltage of reserve battery in monitoring discharge process。
Step 302, when discharge voltage is down to first threshold, only maintain the reserve battery power supply to car-mounted terminal internal clock module。
Step 303, when discharge voltage continues to be down to Second Threshold, interrupt the reserve battery power supply to clock module。
In this embodiment, the voltage threshold of reserve battery during preset stopping electric discharge, it may be assumed that Second Threshold。When the charging voltage of reserve battery continues to be down to Second Threshold, represent that reserve battery current electric quantity cannot meet the power supply of car-mounted terminal clock module, need to stop reserve battery outwards discharging, prevent the situation that backup batteries discharge is excessive further, extend the life-span of reserve battery。
Corresponding above-mentioned car-mounted terminal reserve battery charging method, present invention also offers a kind of car-mounted terminal reserve battery charging device。
As it is shown in figure 5, be a kind of mounted terminal reserve battery charging device embodiment, this charging device specifically may include that
First charging module 501, for when car-mounted terminal backup battery voltage reaches charge threshold, carrying out initial charge with the first electric current to reserve battery；
Charging voltage monitoring module 502, for monitoring the charging voltage of reserve battery in charging process；
Second charging module 503, for when charging voltage rises to the voltage threshold switching charging current, reserve battery being continued charging with the second electric current, the second current values is less than the first current values。
In above-mentioned car-mounted terminal reserve battery charging device, the charge threshold of preset car-mounted terminal reserve battery, namely reserve battery starts the voltage threshold of charging, when the voltage of reserve battery reaches charge threshold, by the first charging module, reserve battery is charged, now, charging current is the first electric current。By charging voltage monitoring module, the charging voltage of reserve battery in charging process is monitored。This is because, in the embodiment of the present invention, the charging current adopted in charging process is associated with the charging voltage of reserve battery。In charging process, when the charging voltage of reserve battery changes, the charging current adopted also changes accordingly。Additionally, the voltage threshold of preset switching charging current, it may be assumed that need to switch the magnitude of voltage that during charging current, reserve battery is corresponding。When the charging voltage of reserve battery reaches this voltage threshold, charging current will switch。Being found by charging voltage monitoring, when the voltage of reserve battery rises to the voltage threshold of switching charging current, then with the second electric current, reserve battery being continued charging by the second charging module, now, the second current values should be less than the first current values。
In the embodiment of the present invention, when car-mounted terminal reserve battery needs to charge, not adopt fixed current to be charged, but when initial charge, adopt the first bigger electric current that reserve battery is charged；Meanwhile, in charging process, the charging voltage of reserve battery is monitored, when this charging voltage rises to the voltage threshold of switching charging current, continues reserve battery is charged with the second less electric current。Owing to initial charge current matches with the voltage in reserve battery charging process, it is possible to avoid the situation occurring charging excessive in reserve battery charging process, extend the life-span of reserve battery。
As shown in Figure 6, for another kind of mounted terminal reserve battery charging device embodiment, this charging device specifically may include that
First charging module 501, for when car-mounted terminal backup battery voltage reaches charge threshold, carrying out initial charge with the first electric current to reserve battery；
Charging voltage monitoring module 502, for monitoring the charging voltage of reserve battery in charging process；
Second charging module 503, for when charging voltage rises to the voltage threshold switching charging current, reserve battery being continued charging with the second electric current, the second current values is less than the first current values；
Module 504 is closed in charging, for when charging voltage rises to charging termination threshold value, stopping reserve battery being charged。
In this device embodiment, the voltage threshold of reserve battery during preset stopping charging, it may be assumed that charging termination threshold value。When the charging voltage of reserve battery rises to charging termination threshold value, represent that reserve battery current electric quantity fills with, it is necessary to close module by charging and stop reserve battery being charged。
Corresponding above-mentioned car-mounted terminal backup batteries discharge method, present invention also offers a kind of car-mounted terminal backup batteries discharge device。
As it is shown in fig. 7, be a kind of mounted terminal backup batteries discharge device embodiment, this electric discharge device specifically may include that
Discharge voltage monitoring module 701, for when car-mounted terminal reserve battery starts to discharge, monitoring the discharge voltage of reserve battery in discharge process；
Control of discharge module 702, for when discharge voltage is down to first threshold, only maintaining the reserve battery power supply to car-mounted terminal internal clock module。
Under normal circumstances, the power supply of car-mounted terminal from storage battery built-in on electric automobile, car-mounted terminal by the system interface that is connected with vehicle from storage battery power taking。When vehicle power supply does not have electric, reserve battery enables, and car-mounted terminal can continue to keep the data communication of a period of time with monitor supervision platform。Such as: after electric automobile is flame-out, before car-mounted terminal needs entrance resting state, vehicle termination needs to continue to and the monitor supervision platform data communication of 3 minutes, in order to state parameter interior during this period of time after monitor supervision platform continuation monitoring electric automobile is flame-out。
In above-mentioned car-mounted terminal backup batteries discharge device, when car-mounted terminal needs to be powered with reserve battery, namely reserve battery starts electric discharge。In the discharge process of reserve battery, it is necessary to by the discharge voltage of discharge voltage monitoring module monitor in real time reserve battery。
It should be noted that reserve battery is in discharge process, internal electricity can gradually decrease along with discharge process。For car-mounted terminal, when the external power source of car-mounted terminal is stopped power supply, in order to ensure the normal use of car-mounted terminal, at least need to keep the clock signal of car-mounted terminal。Therefore, the first threshold of backup batteries discharge voltage is set, when the discharge voltage of reserve battery is down to this first threshold, represent that reserve battery cannot ensure to continue the power supply to other functional modules of car-mounted terminal inside, it is only capable of the power supply preferentially maintained car-mounted terminal internal clock module, to keep the clock signal of car-mounted terminal。Now, reserve battery, to cutting off the power supply of other functional modules in car-mounted terminal, only provides the power supply to car-mounted terminal internal clock module by control of discharge module。
In the embodiment of the present invention, when car-mounted terminal reserve battery needs to discharge, discharge voltage in backup batteries discharge process is monitored, when reaching the voltage threshold preset, reserve battery only provides the power supply to car-mounted terminal internal clock module, cut off the power supply of other functional modules in car-mounted terminal so that reserve battery can retain enough battery electric quantities, it is ensured that the continuity of car-mounted terminal clock simultaneously。Simultaneously, it is prevented that the situation that backup batteries discharge is excessive occurs, the life-span of reserve battery is extended。
As shown in Figure 8, for another kind of mounted terminal backup batteries discharge device embodiment, this electric discharge device specifically may include that
Discharge voltage monitoring module 701, for when car-mounted terminal reserve battery starts to discharge, monitoring the discharge voltage of reserve battery in discharge process；
Control of discharge module 702, for when discharge voltage is down to first threshold, only maintaining the reserve battery power supply to car-mounted terminal internal clock module；
Module 703 is closed in electric discharge, for when described discharge voltage continues to be down to Second Threshold, interrupting the reserve battery power supply to clock module。
In this embodiment, the voltage threshold of reserve battery during preset stopping electric discharge, it may be assumed that Second Threshold。When the charging voltage of reserve battery continues to be down to Second Threshold, represent that reserve battery current electric quantity cannot meet the power supply of car-mounted terminal clock module, require over electric discharge closedown module stopping reserve battery outwards discharging, prevent the situation that backup batteries discharge is excessive further, extend the life-span of reserve battery。
Below by concrete application scenarios, the charging of above-mentioned car-mounted terminal reserve battery, discharge process are described in detail。
In practical application scene, car-mounted terminal reserve battery can adopt lithium battery or Ni-MH battery。Below for Ni-MH battery, the charging of Ni-MH battery, discharge process are described in detail。The powered operation temperature of Ni-MH battery is-20～80 DEG C。
Under normal circumstances, the power supply of car-mounted terminal is from storage battery built-in on electric automobile, car-mounted terminal is by the system interface that is connected with vehicle from storage battery power taking, and voltage range is 9-18V, and car-mounted terminal obtains 5V and the 3.3V voltage needed by the power-switching circuit of self。When vehicle power supply does not have electric, Ni-MH battery enables。In power selection circuit shown in Fig. 9, VCC5VIN is the 5V voltage that external power source is converted to by voltage, VBAT_OUT_5V is the 5V voltage that car-mounted terminal reserve battery is converted to by voltage, provides the voltage of power supply finally to by VCC5VOUT each functional module of car-mounted terminal。When there being external voltage, the source electrode of VCC5VIN to be 5V, VBAT_OUT_5V be also 5V, metal-oxide-semiconductor AO3421E and grid pressure reduction are 0, Q524 be not turned on, and VCC5VIN is powered to car-mounted terminal by diode D35；When external power source does not have, due to the drop-down effect of pull down resistor R808, the grid voltage of Q524 is 0, Q524 conducting, and VBAT_OUT_5V is powered to car-mounted terminal by metal-oxide-semiconductor Q524。
In the car-mounted terminal reserve battery charge-discharge control circuit shown in Figure 10, the voltage of VCC5VIN is 5V, car-mounted terminal be transformed from the power supply input of vehicle。VBAT_charging_control1 and VBAT_charging_control2 is the control pin of single-chip microcomputer, is used for controlling the charging process of battery。LTC1734 is a low-power consumption, constant current/constant voltage charging chip。By the voltage of input VBAT_charging_control1 and VBAT_charging_control2, the electric current of PROG end on LTC1734 can be adjusted, control the charging current of battery afterwards。In running, the voltage of car-mounted terminal meeting monitor in real time battery, charge characteristic according to battery and requirement, when the voltage of battery is less than 3.9V, VBAT_charging_control1 and VBAT_charging_control2 all sets high, charge with the big current versus cell of 300mA, when cell voltage more than 3.9V less than 4.1V time, VBAT_charging_control1 and VBAT_charging_control2 only one of which sets high, with the small area analysis of 150mA, battery is charged, when cell voltage is more than 4.1V, VBAT_charging_control1 and VBAT_charging_control2 all sets low, closedown battery charges。
Additionally, Figure 11 show car-mounted terminal backup batteries discharge cutoff control circuit schematic diagram provided by the invention。It should be noted that the clock of car-mounted terminal is from RTC (Real-TimeClock, the real-time clock) module of single-chip microcomputer。In order to keep the continuous of car-mounted terminal clock, RTC block not power-off need to be ensured。The power supply source of RTC block has two: external power source and reserve battery。When reserve battery is powered, it is necessary to meet RTC not power-off。As shown in figure 11, AP2120 is blanking voltage is the switch chip of 2.5V, when cell voltage drops to 2.5V, switches off, and battery is no longer outwards powered, it is prevented that crosses and puts, and extends battery life。
In order to ensure RTC not power-off, increase the ON-OFF control circuit that the reserve battery shown in Figure 12 is powered to each functional module。Wherein, TPS55330RTE is one and turns off the adjustable switch control chip of voltage, and BAT_Control is the control end of switch, and single-chip microcomputer can gather cell voltage by AD conversion, and the device portions that ellipsis represents is filter capacitor。When voltage drops to 2.7V, namely to BAT_Control end low level, powering thus turning off reserve battery to each functional module, now, reserve battery is only powered for RTC block, until voltage drops to 2.5V。So remaining enough battery electric quantities as RTC, it is ensured that RTC not power down, the clock of car-mounted terminal is maintained。
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention。Therefore, protection scope of the present invention should described be as the criterion with scope of the claims。
Claims (10)
1. a car-mounted terminal reserve battery charging method, it is characterised in that including:
When car-mounted terminal backup battery voltage reaches charge threshold, with the first electric current, described reserve battery is carried out initial charge；
The charging voltage of reserve battery described in monitoring charging process；
When described charging voltage rises to the voltage threshold of switching charging current, with the second electric current, described reserve battery being continued charging, described second current values is less than described first current values。
2. method according to claim 1, it is characterised in that also include:
When described charging voltage rises to charging termination threshold value, stop described reserve battery is charged。
3. a car-mounted terminal backup batteries discharge method, it is characterised in that including:
When car-mounted terminal reserve battery starts to discharge, the discharge voltage of reserve battery described in monitoring discharge process；
When described discharge voltage is down to first threshold, only maintain the power supply to described car-mounted terminal internal clock module of the described reserve battery。
4. method according to claim 3, it is characterised in that also include:
When described discharge voltage continues to be down to Second Threshold, interrupt the power supply to described clock module of the described reserve battery。
5. the method according to claim 3 or 4, it is characterised in that described car-mounted terminal reserve battery starts electric discharge, including:
When the vehicle stall residing for described car-mounted terminal, when described car-mounted terminal needs to enter resting state, described reserve battery starts electric discharge。
6. a car-mounted terminal reserve battery charging device, it is characterised in that including:
First charging module, for when car-mounted terminal backup battery voltage reaches charge threshold, carrying out initial charge with the first electric current to described reserve battery；
Charging voltage monitoring module, for monitoring the charging voltage of reserve battery described in charging process；
Second charging module, for when described charging voltage rises to the voltage threshold switching charging current, described reserve battery being continued charging with the second electric current, described second current values is less than described first current values。
7. device according to claim 6, it is characterised in that also include:
Module is closed in charging, for when described charging voltage rises to charging termination threshold value, stopping described reserve battery is charged。
8. a car-mounted terminal backup batteries discharge device, it is characterised in that including:
Discharge voltage monitoring module, for when car-mounted terminal reserve battery starts to discharge, monitoring the discharge voltage of reserve battery described in discharge process；
Control of discharge module, for when described discharge voltage is down to first threshold, only maintaining the power supply to described car-mounted terminal internal clock module of the described reserve battery。
9. device according to claim 8, it is characterised in that also include:
Module is closed in electric discharge, for when described discharge voltage continues to be down to Second Threshold, interrupting the power supply to described clock module of the described reserve battery。
10. device according to claim 8 or claim 9, it is characterised in that when the vehicle stall residing for described car-mounted terminal, when described car-mounted terminal needs to enter resting state, described reserve battery starts electric discharge。
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| CN201410709283.7A CN105703023A (en) | 2014-11-28 | 2014-11-28 | Charging-discharging method and apparatus for standby battery of vehicle-mounted terminal |
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| CN107994676A (en) * | 2017-11-20 | 2018-05-04 | 深圳创维汽车智能有限公司 | Vehicle communication terminal |
| CN111478402A (en) * | 2020-05-09 | 2020-07-31 | 兴民智通(武汉)汽车技术有限公司 | Vehicle-mounted terminal T-BOX standby battery charging method and system |
| CN112366803A (en) * | 2020-11-06 | 2021-02-12 | 杭州叙简未兰电子有限公司 | Power supply method, power supply circuit and law enforcement recorder |
| CN112421733A (en) * | 2020-12-02 | 2021-02-26 | 歌尔科技有限公司 | Wireless charging control method and related components |
| CN113451671A (en) * | 2019-02-01 | 2021-09-28 | 神讯电脑(昆山)有限公司 | Charging method of standby battery module and electronic device |
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Application publication date: 20160622 |