CN202957657U - Standby battery switching protection circuit of vehicle-mounted GPS terminal - Google Patents
Standby battery switching protection circuit of vehicle-mounted GPS terminal Download PDFInfo
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- CN202957657U CN202957657U CN 201220726478 CN201220726478U CN202957657U CN 202957657 U CN202957657 U CN 202957657U CN 201220726478 CN201220726478 CN 201220726478 CN 201220726478 U CN201220726478 U CN 201220726478U CN 202957657 U CN202957657 U CN 202957657U
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Abstract
The utility model discloses a standby battery switching protection circuit of a vehicle-mounted GPS terminal, which comprises a charging chip, an electronic switch, a first voltage detection chip, a logic circuit and a second voltage detection chip. An external 5V power supply is input through three paths, wherein the external 5V power supply is input to the first voltage detection chip through a first path and then the first voltage detection chip outputs a detection result to the logic circuit. Meanwhile, the external 5V power supply is directly input to the electronic switch through a second path and is input to the charging chip through a third path, and then the input is input to the electronic switch through a battery connected with the charging chip. The second voltage detection chip is connected with the output end of the electronic switch. The logic circuit is used for generating a judging signal so as to control the electronic switch, switch the power supply between the external power supply and the battery, and protect the battery, according to the voltage of the external power supply detected by the first voltage detection chip, and the battery voltage input by the second voltage detection chip. Due to the adoption of the standby battery switching protection circuit, when a terminal is installed and electrified, the standby battery is automatically switched on to facilitate the installation and application thereof. When the external power supply of the terminal is cut off, the battery discharges electricity till the voltage of the battery reaches a preset storage voltage. Then the battery is automatically switched off to stop discharge electricity to the outside. Therefore, the over-discharge is avoided and the service life of the battery is prolonged.
Description
Technical field
The utility model relates to the GPS terminal equipment, and what be specifically related to is a kind of GPS terminal reserve battery switch protecting circuit.
Background technology
Battery, in discharge process, if surpass the final voltage value of battery discharge, also continues electric discharge and just may cause inner pressure of battery to raise, and the invertibity of positive and negative electrode active material is damaged, and the capacity generation of battery is obviously reduced, and causes battery over-discharge; In the battery use procedure, when the percentage that the capacity that battery discharge is emitted accounts for its rated capacity is 100%, be called depth of discharge, there are much relations in the charging life-span of the height of depth of discharge and secondary cell, when the depth of discharge of secondary cell darker, its charging life-span is just shorter, therefore should avoid deep discharge in use as far as possible.Because not used meeting cause battery to cross by self-discharge phenomenon for a long time, lithium battery do not put, in order to protect lithium battery, lithium ion battery or lithium polymer battery major part have the protective circuit plate, protection voltage is generally 2.8-3V, voltage lower than this voltage after, not outwards power supply of battery, self discharge continues, now battery charging must the use special equipment could be by battery activated charging, therefore the battery storage voltage that battery manufacturer is recommended is that 3.8V (be take the 1C electric discharge as example, battery discharge is 70% left and right in whole battery capacity to the discharge capacity of 3.8V) to guarantee that self-discharge of battery can not cause battery over-discharge more than three months, surpass and within 3 months, need battery is charged.
Current GPS terminal generally can be used the following lithium battery of 1000mAH as the outage reserve battery, warning during for abnormal power-down is used, the design battery working time is in 24 hours, different from consumer electronics products such as mobile phones, GPS terminal dispatches from the factory and gets on the bus that install will be through the longer storage time, particularly the terminal of auto-loading, also have the dealer to store in a warehouse the time, generally all is greater than 3 months that battery storage is recommended.Therefore GPS terminal is for reaching the storage purpose, be designed with the mechanical type cell switch, when installing and using terminal, the reserve battery switch opens could must be used, if before storage, mistake is opened battery, battery will be in discharge condition, battery will discharge into below the protection voltage 3V of battery autoprotection plate in 24 hours, battery will need special equipment ability activating charge, if GPS terminal in use runs into abnormal power-down, or the burglar destroys outage, battery will discharge into below the protection voltage 3V of battery autoprotection plate in 24 hours, battery will need the special equipment could be to battery activated charging.
Hence one can see that; must be by the battery machine switch opens when car-mounted terminal is used battery at present; there is inconvenient problem with use; and open rear battery and will discharge into battery protecting plate protection always; there will be the battery deep discharge, or even the problem of overdischarge, thereby cause battery to charge normal; affect battery life, cause terminal must change battery.
The utility model content
Given this, the purpose of this utility model is to provide a kind of GPS terminal reserve battery switch protecting circuit, to solve current GPS terminal reserve battery, needs mechanical switch, without the shortcoming of storage discharge prevention.
The purpose of this utility model is achieved through the following technical solutions.
A kind of GPS terminal reserve battery switch protecting circuit, comprise charging chip, electronic switch, the first voltage checking chip, logical circuit and second voltage detection chip, outside 5V power supply divides three tunnel inputs, the first via is input to the first voltage checking chip, for detection of input voltage, and by the first voltage checking chip, testing result is input to logical circuit, the second road is directly inputted to electronic switch, Third Road input charging chip, and be input to electronic switch through the battery of charging chip connection, control the output cell voltage by electronic switch, described second voltage detection chip is connected with the electronic switch output, cell voltage for detection of output, and testing result is sent to logical circuit, described logical circuit produces judgement signal controlling electronic switch for the voltage that detects externally fed according to the first voltage checking chip and the cell voltage that the second voltage detection chip is inputted, for outside 5V Power supply and battery powered switching and battery protection, when battery is closed, during without outside 5V power voltage supply, electronic switch is in closed condition, and battery is outwards power supply not, when external power source 5V voltage normally accesses, the first voltage checking chip is exported to logical circuit by testing result, logical circuit is controlled the battery charging and is controlled electronic switch A end (5V) and the conducting of C end, export 5V voltage to terminal by the C end, the 5V power voltage supply that now terminal is provided by external power supply, simultaneously the second voltage detection chip detects the voltage of output, by battery in pre-open mode, when outside 5V power supply is inputted abnormal, and during lower than 4.5V, the first voltage checking chip is exported to logical circuit by 5V electric voltage exception signal, the second voltage detection chip by battery in pre-open mode, logical circuit is by the B of electronic switch end (battery-end) and the conducting of C end, and by the output of C end, now terminal is battery-powered, work as battery discharge, voltage is during lower than the protection voltage 3.8V that sets, the second voltage detection chip is exported to logical circuit by testing result, logical circuit is controlled the power supply that electronic switch cuts off battery, control signal and electronic switch output switch form the positive feedback relation.
Preferably, described logical circuit also is connected with the MCU interface, for being controlled by the MCU interface, and closes or setting voltage is closed battery by the terminal interconnection network is long-range.
Preferably, also be connected with battery between described charging chip and electronic switch.
Preferably, described the first voltage checking chip U1 is the XC61CC4502M chip, for output high level when detection voltage is greater than 4.5V.
Preferably, described second voltage detection chip U2 is the XC61CC3802M chip, for output high level when detection voltage is greater than 3.8V.
Preferably, described electronic switch U3 is that AP2301SG is 2 amperes of mains switch chips.
Compared with prior art, beneficial effect is the utility model: the GPS terminal reserve battery switch protecting circuit that the utility model provides, and can make terminal install while powering on and automatically open reserve battery, conveniently install and use; And during the exterior of terminal dump, battery discharge can automatically cut off battery during to storage voltage and outwards discharge, and can prevent deep discharge, reaches and extends terminal (battery) purpose of storage time, extends the useful life of battery.
The accompanying drawing explanation
The theory diagram that Fig. 1 is the utility model GPS terminal reserve battery switch protecting circuit.
Fig. 2 is the utility model GPS terminal reserve battery switch protecting circuit theory diagrams.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to shown in Fig. 1 the theory diagram that Fig. 1 is the utility model GPS terminal reserve battery switch protecting circuit.The utility model provides a kind of GPS terminal reserve battery switch protecting circuit, and being mainly used in solving current GPS terminal reserve battery needs mechanical switch, without the shortcoming of storage discharge prevention.
Wherein the utility model GPS terminal reserve battery switch protecting circuit mainly includes charging chip, electronic switch, the first voltage checking chip, logical circuit and second voltage detection chip, outside 5V power supply divides three tunnel inputs, the first via is input to the first voltage checking chip, for detection of input voltage, and by the first voltage checking chip, testing result is input to logical circuit; The second road is directly inputted to electronic switch; Third Road input charging chip, and charge the battery through charging chip, battery is input to electronic switch, by electronic switch, controls the output cell voltage; Described second voltage detection chip is connected with the electronic switch output; cell voltage for detection of output; and testing result is sent to logical circuit; described logical circuit produces judgement signal controlling electronic switch for the voltage that detects externally fed according to the first voltage checking chip and the cell voltage that the second voltage detection chip is inputted, for outside 5V Power supply and battery powered switching and battery protection.
When battery is closed, during without outside 5V power voltage supply, the electronics electronic switch is in closed condition, battery is outwards power supply not, and when 5V voltage normally accesses, the first voltage checking chip is exported to logical circuit by testing result, logical circuit is controlled the battery charging and is controlled electronic switch A and hold (5V) and the conducting of C end by the output of C end, the 5V power voltage supply that terminal is provided by external power supply, simultaneously the second voltage detection chip is also at the voltage that detects output, by battery in pre-open mode.
When the 5V power supply is inputted abnormal, during lower than 4.5V, the first voltage checking chip is exported to logical circuit by 5V electric voltage exception signal, the second voltage detection chip by battery in pre-open mode, logical circuit is exported the B of electronic switch end (battery-end) and the conducting of C end by the C end; Terminal is battery-powered; work as battery discharge; voltage is during lower than the protection voltage 3.8V that sets; the second voltage detection chip is exported to logical circuit by testing result; logical circuit is controlled the power supply that electronic switch cuts off battery; control signal and electronic switch output switch form the positive feedback relation; after output voltage is lower than 3.8V; electronic switch cuts out; the voltage of output (C end) will be more and more lower; can not produce oscillatory occurences, due to the physical connection of battery, between electronic switch and charging chip, battery is closed by the outside leakage current of charging chip below 1uA.
The utility model circuit also possesses the MCU interface; detected the voltage of battery by AD by MCU; can control battery closing higher than automatic protection voltage 3.8V the time by MCU; equally due to the regenerative circuit design; after MCU triggering battery is closed; battery can outwards not powered, after realizing Default Value or long-range (terminal possesses remote communicating function) control the purpose close battery.
Shown in Figure 2, Fig. 2 is the utility model GPS terminal reserve battery switch protecting circuit theory diagrams.Include the first power supply detection chip U1 in this circuit, adopt the 4.5V power supply detection chip of XC61CC4502M, output high level while for detection of voltage, being greater than 4.5V; Second source detection chip U2, the 3.8V power supply detection chip of employing XC61CC3802M, output high level while for detection of voltage, being greater than 3.8V; Electronic switch U3, adopt two amperes of mains switch chips of AP2301SG, and its 4th pin is enable signal, and Low level effective, by switch connection; When input supply voltage equals 5V, power supply outputs to the OUT end through diode D2, output high level when U1 detects input voltage and is greater than 4.5V, through diode D1, the 4th pin of U3 is locked in to high level state, U2 detects output voltage and is greater than 3.8V output high level, triode Q1 conducting, the Q1 conducting can not drag down mains switch chip the 4th pin through the R3 current limliting, and switch cuts out, and battery is outwards power supply not; When externally fed abnormal, the 5V supply voltage drops into 4.5V when following, U1 is output as low level, U2 detects output voltage still higher than 3.8V, triode Q1 conducting, the dividing potential drop that the level voltage of U3 the 4th pin is R1 and R3, U3 the 4th pin is dragged down by Q1, enable effectively, switch opens, battery is powered to the OUT end by U3.
When externally fed interrupts, cell voltage is battery-powered higher than 3.8V, in the time of need to closing battery by MCU, as long as MCU is to MCU_OFF signal low level, now Q1 will end, and U3 enable signal (the 4th pin) is drawn high by resistance R 1, switch U3 closes, the OUT terminal voltage drops into below 3.8V rapidly, and U2 is output low level, the locking switch closed condition; When battery due to electric discharge, make voltage drop into 3.8V when following, U2 is by output low level, and Q1 ends, and U3 enable signal (the 4th pin) is drawn high by resistance R 1, battery is closed, owing to being the positive feedback relation, after switch cuts out, the voltage of OUT end can be more and more lower, even cell voltage is now arranged because of the load reduction voltage recovery, switch can conducting not produce vibration yet.
The utility model efficiently solves the GPS terminal reserve battery needs mechanical switch, without the problem of storage discharge prevention; Can make terminal install while powering on and automatically open reserve battery, facilitate and installed and used; The exterior of terminal dump, battery discharge can automatically cut off battery during to storage voltage and outwards discharge, and prevents deep discharge, reaches and extends terminal (battery) purpose of storage time, extending battery life.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. a GPS terminal reserve battery switch protecting circuit, it is characterized in that comprising charging chip, electronic switch, the first voltage checking chip, logical circuit and second voltage detection chip, outside 5V power supply divides three tunnel inputs, the first via is input to the first voltage checking chip, for detection of input voltage, and by the first voltage checking chip, testing result is input to logical circuit, the second road is directly inputted to electronic switch, Third Road input charging chip, and charge the battery through charging chip, battery is input to electronic switch, by electronic switch, controls the output cell voltage, described second voltage detection chip is connected with the electronic switch output, cell voltage for detection of output, and testing result is sent to logical circuit, described logical circuit produces judgement signal controlling electronic switch for the voltage that detects externally fed according to the first voltage checking chip and the cell voltage that the second voltage detection chip is inputted, for outside 5V Power supply and battery powered switching and battery protection, when battery is closed, during without outside 5V power voltage supply, electronic switch is in closed condition, and battery is outwards power supply not, when external power source 5V voltage normally accesses, the first voltage checking chip is exported to logical circuit by testing result, logical circuit is controlled the battery charging and is controlled electronic switch A end 5V and the conducting of C end, export 5V voltage to terminal by the C end, the 5V power voltage supply that now terminal is provided by external power supply, simultaneously the second voltage detection chip detects the voltage of output, by battery in pre-open mode, when outside 5V power supply is inputted abnormal, during lower than 4.5V, the first voltage checking chip is exported to logical circuit by 5V electric voltage exception signal, the second voltage detection chip by battery in pre-open mode, logical circuit is by electronic switch, B end cell end and the conducting of C end, and by the output of C end, now terminal is battery-powered, work as battery discharge, voltage is during lower than the protection voltage 3.8V that sets, the second voltage detection chip is exported to logical circuit by testing result, logical circuit is controlled the power supply that electronic switch cuts off battery, output forms the positive feedback relation with control switch, the voltage of closing rear output is more and more lower, can not cause oscillatory occurences.
2. GPS terminal reserve battery switch protecting circuit according to claim 1; it is characterized in that described logical circuit also is connected with the MCU interface; for being controlled by the MCU interface, and close or setting voltage is closed battery by the terminal interconnection network is long-range.
3. GPS terminal reserve battery switch protecting circuit according to claim 1, is characterized in that between described charging chip and electronic switch also being connected with battery.
4. GPS terminal reserve battery switch protecting circuit according to claim 1, is characterized in that described the first voltage checking chip U1 is the XC61CC4502M chip, for output high level when detection voltage is greater than 4.5V.
5. GPS terminal reserve battery switch protecting circuit according to claim 1, is characterized in that described second voltage detection chip U2 is the XC61CC3802M chip, for output high level when detection voltage is greater than 3.8V.
6. GPS terminal reserve battery switch protecting circuit according to claim 1, is characterized in that described electronic switch U3 is that AP2301SG is 2 amperes of mains switch chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220726478 CN202957657U (en) | 2012-12-26 | 2012-12-26 | Standby battery switching protection circuit of vehicle-mounted GPS terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220726478 CN202957657U (en) | 2012-12-26 | 2012-12-26 | Standby battery switching protection circuit of vehicle-mounted GPS terminal |
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| Publication Number | Publication Date |
|---|---|
| CN202957657U true CN202957657U (en) | 2013-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220726478 Withdrawn - After Issue CN202957657U (en) | 2012-12-26 | 2012-12-26 | Standby battery switching protection circuit of vehicle-mounted GPS terminal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023134A (en) * | 2012-12-26 | 2013-04-03 | 深圳市伊爱高新技术开发有限公司 | Switching and protection circuit for standby battery of vehicle-mounted GPS (global positioning system) terminal |
| WO2015131586A1 (en) * | 2014-09-29 | 2015-09-11 | 中兴通讯股份有限公司 | Power supply switching method and device, and hand-held terminal |
| CN105406575A (en) * | 2015-12-29 | 2016-03-16 | 深圳市伊爱高新技术开发有限公司 | Power supply follow current circuit for USB wireless network card |
| CN109041360A (en) * | 2018-06-07 | 2018-12-18 | 佛山市毅丰电器实业有限公司 | A kind of upgrading control device of stage lamp |
-
2012
- 2012-12-26 CN CN 201220726478 patent/CN202957657U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023134A (en) * | 2012-12-26 | 2013-04-03 | 深圳市伊爱高新技术开发有限公司 | Switching and protection circuit for standby battery of vehicle-mounted GPS (global positioning system) terminal |
| WO2015131586A1 (en) * | 2014-09-29 | 2015-09-11 | 中兴通讯股份有限公司 | Power supply switching method and device, and hand-held terminal |
| CN105406575A (en) * | 2015-12-29 | 2016-03-16 | 深圳市伊爱高新技术开发有限公司 | Power supply follow current circuit for USB wireless network card |
| CN109041360A (en) * | 2018-06-07 | 2018-12-18 | 佛山市毅丰电器实业有限公司 | A kind of upgrading control device of stage lamp |
| CN109041360B (en) * | 2018-06-07 | 2021-03-19 | 佛山市毅丰电器实业有限公司 | Upgrading control device of stage lamp |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130529 Effective date of abandoning: 20150114 |
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| RGAV | Abandon patent right to avoid regrant |