CN204142820U - A kind of current detection circuit and board units - Google Patents
A kind of current detection circuit and board units Download PDFInfo
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- CN204142820U CN204142820U CN201420539320.XU CN201420539320U CN204142820U CN 204142820 U CN204142820 U CN 204142820U CN 201420539320 U CN201420539320 U CN 201420539320U CN 204142820 U CN204142820 U CN 204142820U
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- switching tube
- detection circuit
- current detection
- operational amplifier
- board units
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Abstract
The utility model provides a kind of current detection circuit and board units, and described current detection circuit comprises: current sense resistor, the first input resistance, the second input resistance, operational amplifier, the first switching tube and output resistance.In the utility model, in board units, increase the current detection circuit that the utility model provides, by the electric current of wake-up circuit in current detection circuit inspection vehicle carrier unit.Because current detection circuit can detect the electric current of wake-up circuit, therefore board units is when finding current anomaly (namely electric current is excessive) of wake-up circuit, can reset or close wake-up circuit, the electricity of rechargeable battery is avoided to be exhausted by the wake-up circuit of exception, thus avoid disposable battery to serve as reserve battery, therefore the electricity of disposable battery can not be exhausted very soon, extends the serviceable life of the disposable battery of board units.
Description
Technical field
The application relates to intelligent transportation field, particularly a kind of current detection circuit and board units.
Background technology
Electronic non-parking automatic charging (Electronic Toll Collection, ETC), that a kind of payment that do not need to stop comes by the charging method of charge station, board units (On Board Unit has been installed, OBU) when vehicle is by charge station, board units and roadside unit (RSU, Road Side Unit) carry out communication, complete transaction.
Roadside unit, also claims road side base station, and its major function carries out communication, related transmitting information with the board units installed on vehicle and track computing machine.
Board units is arranged in car, is the equipment carrying out communication with roadside unit, also stores the information relevant to electric non-stop toll, as the information such as license plate number, vehicle simultaneously.
The power consumption of board units mainly comprises stand-by power consumption and transaction power consumption, and because the board units most of the time is in holding state, therefore stand-by power consumption is the principal element affecting board units serviceable life, accounts for 70% of total power consumption.And stand-by power consumption causes primarily of wake-up circuit, because wake-up circuit is in normally open under holding state, main control module is in dormant state, and other external unit is in closed condition.Due to some unpredictable reason, there is the instability of certain probability in the electric current of wake-up circuit, the electric current of wake-up circuit is at about 10 microamperes under normal circumstances, under abnormal conditions, the electric current of wake-up circuit can reach tens microamperes up to a hundred even milliampere level, and existing board units is inner owing to not having current detection circuit, the electric current of wake-up circuit cannot be detected, therefore when abnormal (namely electric current is excessive) appears in the electric current of wake-up circuit, board units can not the abnormal row relax of going forward side by side of Timeliness coverage, the electricity of the rechargeable battery of board units is caused to be exhausted very soon, when the electricity of the rechargeable battery of board units is depleted, the disposable battery of board units serves as reserve battery, charge to rechargeable battery.Due to after the electricity of disposable battery is depleted, cannot recover, can only scrap, therefore when abnormal (namely electric current is excessive) appears in the electric current of wake-up circuit, will seriously reduce the serviceable life of the disposable battery of board units.
Utility model content
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of current detection circuit and board units, and to reach the object in the serviceable life of the disposable battery extending board units, technical scheme is as follows:
A kind of current detection circuit, comprising: current sense resistor, the first input resistance, the second input resistance, operational amplifier, the first switching tube and output resistance;
The first end of described current sense resistor is connected with the second switch pipe of board units belonging to described current detection circuit, and the second end of described current sense resistor is connected with the wake-up circuit of described board units;
The first end of described first input resistance is connected with the first end of described current sense resistor, and the second end of described first input resistance is connected with the inverting input of described operational amplifier;
The first end of described second input resistance is connected with the first end of described current sense resistor, and the second end of described second input resistance is connected with the in-phase input end of described operational amplifier;
First power end of described operational amplifier is connected with the first end of described first input resistance, the second source end ground connection of described operational amplifier;
The first end of described first switching tube is connected with the output terminal of described operational amplifier, and the second end of described first switching tube is connected with the inverting input of described operational amplifier, and the 3rd end of described first switching tube is connected with the first end of described output resistance;
The first end of described output resistance is connected with the analog-to-digital conversion module of the main control module of described board units, the second end ground connection of described output resistance.
Preferably, described first switching tube comprises:
PMOS;
The grid of described PMOS is connected with the output terminal of described operational amplifier, and the source electrode of described PMOS is connected with the inverting input of described operational amplifier, and the drain electrode of described PMOS is connected with the first end of described output resistance.
Preferably, described first switching tube comprises: PNP triode and biasing resistor;
The base stage of described PNP triode is connected with the first end of described biasing resistor, second end of described biasing resistor is connected with the output terminal of described operational amplifier, the emitter of described PNP triode is connected with the inverting input of described operational amplifier, and the collector of described PNP triode is connected with the first end of described output resistance.
Preferably, also comprise:
3rd switching tube;
The first end of described first input resistance is connected with the first end of described current sense resistor by described 3rd switching tube;
Described 3rd switching tube is connected with described main control module.
A kind of board units, comprising: wake-up circuit, main control module, second switch pipe, supply module, the 4th switching tube, external unit and the current detection circuit as described in above-mentioned any one;
The output terminal of described supply module is connected with described main control module with described second switch pipe, described 4th switching tube respectively;
Described main control module is connected with described second switch pipe, described 4th switching tube, described external unit respectively;
Described 4th switching tube is connected with described external unit;
Described external unit ground connection;
Described main control module ground connection;
Described wake-up circuit ground connection.
Preferably, described external unit at least comprises:
Acousto-optic hint module.
Preferably, described external unit at least comprises:
IC-card module for reading and writing.
Compared with prior art, the beneficial effect of the application is:
In the utility model, in board units, increase the current detection circuit that the utility model provides, by the electric current of wake-up circuit in current detection circuit inspection vehicle carrier unit.Because current detection circuit can detect the electric current of wake-up circuit, therefore board units is when finding current anomaly (namely electric current is excessive) of wake-up circuit, can reset or close wake-up circuit, the electricity of rechargeable battery is avoided to be exhausted by the wake-up circuit of exception, thus avoid disposable battery to serve as reserve battery, therefore the electricity of disposable battery can not be exhausted very soon, extends the serviceable life of the disposable battery of board units.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of electronic schematic diagram of the current detection circuit that the utility model provides;
Fig. 2 is the another kind of electronic schematic diagram of the current detection circuit that the utility model provides;
Fig. 3 is another electronic schematic diagram of the current detection circuit that the utility model provides;
Fig. 4 is another electronic schematic diagram of the current detection circuit that the utility model provides;
Fig. 5 is a kind of structural representation of the board units that the utility model provides;
Fig. 6 is the another kind of structural representation of the board units that the utility model provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
Refer to Fig. 1, it illustrates a kind of electronic schematic diagram of the current detection circuit that the utility model provides, current detection circuit comprises: current sense resistor R
sENSE, the first input resistance R
1, the second input resistance R
2, operational amplifier 11, first switching tube 12 and output resistance R
oUT.Wherein:
Current sense resistor R
sENSEfirst end be connected with the second switch pipe of board units belonging to described current detection circuit, described current sense resistor R
sENSEthe second end be connected with the wake-up circuit of board units belonging to described current detection circuit.
Described first input resistance R
1first end and described current sense resistor R
sENSEfirst end be connected, described first input resistance R
1the second end be connected with the inverting input of described operational amplifier 11.
Described second input resistance R
2first end and described current sense resistor R
sENSEfirst end be connected, described second input resistance R
2the second end be connected with the in-phase input end of described operational amplifier 11.
First power end of described operational amplifier 11 and described first input resistance R
1first end be connected, the second source end ground connection of described operational amplifier 11.
The first end of described first switching tube 12 is connected with the output terminal of described operational amplifier 11, and the second end of described first switching tube 12 is connected with the inverting input of described operational amplifier 11, the 3rd end of described first switching tube 12 and described output resistance R
oUTfirst end be connected.
Described output resistance R
oUTfirst end be connected with analog to digital conversion (ADC) module of the main control module of described board units, described output resistance R
oUTthe second end ground connection.
In the present embodiment, the specific works process for the current detection circuit shown in Fig. 1 is described, as follows:
Current sense resistor R
sENSEfor the electric current I of wake-up circuit is converted to voltage V
sENSE, i.e. V
sENSE=I × R
sENSE, and operational amplifier 11, first switching tube 12, first input resistance R
1, the second input pickup resistance R
2with output resistance R
oUTthe amplifying circuit formed is used for current sense resistor R
sENSEthe voltage V at two ends
sENSEamplify certain multiple N, obtain output voltage V
oUT, i.e. V
oUT=V
sENSE× N, described N be greater than 1 real number.
Current detection circuit is by output voltage V
oUTexport to and output resistance R
oUTthe described current detection circuit that is connected of first end belonging to the analog-to-digital conversion module of main control module of board units.
The analog-to-digital conversion module of the main control module of board units belonging to described current detection circuit is at the output voltage V receiving current detection circuit output
oUTafter, due to output voltage V
oUTfor analog voltage, therefore described analog-to-digital conversion module is by output voltage V
oUTbe converted to numeral to export.The numerical value that main control module then exports according to analog-to-digital conversion module extrapolates the current value of wake-up circuit, i.e. I=V
oUT/ (N × R
sENSE), and judge that whether the electric current of wake-up circuit is abnormal according to the current value of the wake-up circuit extrapolated.When main control module finds current anomaly (namely electric current is excessive) of wake-up circuit, by controlling second switch pipe reset wake-up circuit (namely first closed by second switch pipe and open wake-up circuit again), then the electric current of wake-up circuit is detected again by current detection circuit, if find that the electric current of wake-up circuit recovers normal, then wake-up circuit is held open state, if find that the electric current of wake-up circuit is still abnormal, then close wake-up circuit.
In the present embodiment, current detection circuit is in normally open, is in normally open is applicable to the very low situation of the power consumption of current detection circuit at current detection circuit.
In the present embodiment, the main control module of described board units can be opened wake-up circuit and be detected the electric current of wake-up circuit by current detection circuit after completing the operations such as plug-in card, distribution, activation, transaction.The advantage of this processing mode is that current detection circuit carries out current detecting and carries out together with other operates, very little on the power consumption impact of board units.
Further, the main control module of described board units can be waken up by timer timing and then opened wake-up circuit and detect the electric current of wake-up circuit by current detection circuit from dormant state.The advantage of all processing modes is fixed the time that current detection circuit carries out current detecting, can the abnormal conditions of Timeliness coverage wake-up circuit, resets or close wake-up circuit, avoiding the electricity of rechargeable battery and disposable battery depleted.
In the utility model, in board units, increase the current detection circuit that the utility model provides, by the electric current of wake-up circuit in current detection circuit inspection vehicle carrier unit.Because current detection circuit can detect the electric current of wake-up circuit, therefore board units is when finding current anomaly (namely electric current is excessive) of wake-up circuit, can reset or close wake-up circuit, the electricity of rechargeable battery is avoided to be exhausted by the wake-up circuit of exception, thus avoid disposable battery to serve as reserve battery, therefore the electricity of disposable battery can not be exhausted very soon, extends the serviceable life of the disposable battery of board units.
In the present embodiment, the first switching tube is specifically as follows PMOS 121, as shown in Figure 2.
When the first switching tube 12 is PMOS 121, the grid of PMOS 121 is as the first end of described first switching tube 12, the source electrode of PMOS 121 is as the second end of described first switching tube 12, and the drain electrode of PMOS 121 is as the 3rd end of described first switching tube 12.Concrete is: the grid of described PMOS 121 is connected with the output terminal of described operational amplifier 11, the source electrode of described PMOS121 pipe is connected with the inverting input of described operational amplifier 11, and the drain electrode of described PMOS121 pipe is connected with the first end of described output resistance ROUT.
Certainly, the form of the first switching tube 12 is not limited to PMOS 121, can also be specifically: PNP triode 122 and biasing resistor 123, as shown in Figure 3.
The first switching tube 12 be PNP triode 122 and biasing resistor 123 time, second end of biasing resistor 123 is as the first end of described first switching tube 12, the emitter of described PNP triode 122 is as the second end of described first switching tube 12, and the collector of described PNP triode 122 is as the 3rd end of described first switching tube 12.Concrete, the base stage of described PNP triode 122 is connected with the first end of described biasing resistor 123, second end of described biasing resistor 123 is connected with the output terminal of described operational amplifier 11, the emitter of described PNP triode 122 is connected with the inverting input of described operational amplifier 11, the collector of described PNP triode 122 and described output resistance R
oUTfirst end be connected.
Wherein, the base stage of described PNP triode 122 is connected with the first end of described biasing resistor 123, be connected with the output terminal of described operational amplifier 11 base stage of i.e. described PNP triode 122 of second end of described biasing resistor 123 be connected in series biasing resistor 123, and passes through biasing resistor 123 and be connected with the output terminal of described operational amplifier 11.
Embodiment two
In the present embodiment, the basis of the current detection circuit shown in Fig. 1 expands another current detection circuit, refers to Fig. 4, the basis of the current detection circuit shown in Fig. 1 also comprises: the 3rd switching tube 21.Wherein:
First input resistance R
1first end by the 3rd switching tube 21 and current sense resistor R
sENSEfirst end be connected; 3rd switching tube 21 is connected with described main control module.
Current detection circuit shown in the present embodiment is after adding the 3rd switching tube 21, normal off status can be in, when needs carry out current detecting, described main control module just controls the 3rd switching tube 21 firing current testing circuit, and current detection circuit is then in running order.
Current detection circuit is in normal off status, and the working method being just in opening is when needed applicable to the higher situation of the power consumption of current detection circuit.
Wherein, the type selecting difference of operational amplifier 11 can cause the power consumption of current detection circuit different.
Equally, in the present embodiment, the main control module of described board units can be opened wake-up circuit and be detected the electric current of wake-up circuit by current detection circuit after completing the operations such as plug-in card, distribution, activation, transaction.The advantage of this processing mode is that current detection circuit carries out current detecting and carries out together with other operates, very little on the power consumption impact of board units.
Further, the main control module of described board units can be waken up by timer timing and then opened wake-up circuit and detect the electric current of wake-up circuit by current detection circuit from dormant state.The advantage of all processing modes is fixed the time that current detection circuit carries out current detecting, can the abnormal conditions of Timeliness coverage wake-up circuit, resets or close wake-up circuit, avoiding the electricity of rechargeable battery and disposable battery depleted.
Illustrating of the specific works process for current detection circuit Fig. 1 shown in of the specific works process of current detection circuit shown in the present embodiment when in running order as shown in embodiment one, does not repeat them here.
Embodiment three
In the present embodiment, show a kind of structural representation of the board units that the utility model provides, refer to Fig. 5, board units comprises: wake-up circuit 31, main control module 32, second switch pipe 33, supply module 34, the 4th switching tube 35, external unit 36 and current detection circuit 37.Wherein, the current detection circuit of concrete structure as shown in embodiment one of current detection circuit 37, does not repeat them here.
The output terminal of supply module 34 is connected with main control module 32 with second switch pipe 33, the 4th switching tube 35 respectively.
Wherein, supply module 34 forms, for power supply primarily of rechargeable battery and disposable battery.
Main control module 32 is connected with second switch pipe 33, the 4th switching tube 35, external unit 36 respectively.
4th switching tube 35 is connected with described external unit 36.
External unit 36 ground connection.
Main control module 32 ground connection.
Wake-up circuit 31 ground connection.
The wake-up signal that wake-up circuit 31 is launched for receiving roadside unit.
In the present embodiment, also show the another kind of structural representation of the board units that the utility model provides, refer to Fig. 6, board units comprises: wake-up circuit 31, main control module 32, second switch pipe 33, supply module 34, the 4th switching tube 35, external unit 36 and current detection circuit 41.Wherein, the current detection circuit of concrete structure as shown in embodiment two of current detection circuit 41, does not repeat them here.
The output terminal of supply module 34 is connected with main control module 32 with second switch pipe 33, the 4th switching tube 35 respectively.
Main control module 32 is connected with second switch pipe 33, the 4th switching tube 35, external unit 36 respectively.
4th switching tube 35 is connected with described external unit 36.
External unit 36 ground connection.
Main control module 32 ground connection.
Wake-up circuit 31 ground connection.
In the present embodiment, external unit 36 specifically can but be not limited to acousto-optic hint module or IC-card (Integrated Circuit Card, integrated circuit card) module for reading and writing.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.Be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the most wide region consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a current detection circuit, is characterized in that, comprising: current sense resistor, the first input resistance, the second input resistance, operational amplifier, the first switching tube and output resistance;
The first end of described current sense resistor is connected with the second switch pipe of board units belonging to described current detection circuit, and the second end of described current sense resistor is connected with the wake-up circuit of described board units;
The first end of described first input resistance is connected with the first end of described current sense resistor, and the second end of described first input resistance is connected with the inverting input of described operational amplifier;
The first end of described second input resistance is connected with the first end of described current sense resistor, and the second end of described second input resistance is connected with the in-phase input end of described operational amplifier;
First power end of described operational amplifier is connected with the first end of described first input resistance, the second source end ground connection of described operational amplifier;
The first end of described first switching tube is connected with the output terminal of described operational amplifier, and the second end of described first switching tube is connected with the inverting input of described operational amplifier, and the 3rd end of described first switching tube is connected with the first end of described output resistance;
The first end of described output resistance is connected with the analog-to-digital conversion module of the main control module of described board units, the second end ground connection of described output resistance.
2. current detection circuit according to claim 1, is characterized in that, described first switching tube comprises:
PMOS;
The grid of described PMOS is connected with the output terminal of described operational amplifier, and the source electrode of described PMOS is connected with the inverting input of described operational amplifier, and the drain electrode of described PMOS is connected with the first end of described output resistance.
3. current detection circuit according to claim 1, is characterized in that, described first switching tube comprises: PNP triode and biasing resistor;
The base stage of described PNP triode is connected with the first end of described biasing resistor, second end of described biasing resistor is connected with the output terminal of described operational amplifier, the emitter of described PNP triode is connected with the inverting input of described operational amplifier, and the collector of described PNP triode is connected with the first end of described output resistance.
4. the current detection circuit according to any one of claim 1-3, is characterized in that, also comprises:
3rd switching tube;
The first end of described first input resistance is connected with the first end of described current sense resistor by described 3rd switching tube;
Described 3rd switching tube is connected with described main control module.
5. a board units, is characterized in that, comprising: wake-up circuit, main control module, second switch pipe, supply module, the 4th switching tube, external unit and the current detection circuit as described in claim 1-4 any one;
The output terminal of described supply module is connected with described main control module with described second switch pipe, described 4th switching tube respectively;
Described main control module is connected with described second switch pipe, described 4th switching tube, described external unit respectively;
Described 4th switching tube is connected with described external unit;
Described external unit ground connection;
Described main control module ground connection;
Described wake-up circuit ground connection.
6. board units according to claim 5, is characterized in that, described external unit at least comprises:
Acousto-optic hint module.
7. board units according to claim 5, is characterized in that, described external unit at least comprises:
IC-card module for reading and writing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420539320.XU CN204142820U (en) | 2014-09-18 | 2014-09-18 | A kind of current detection circuit and board units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420539320.XU CN204142820U (en) | 2014-09-18 | 2014-09-18 | A kind of current detection circuit and board units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204142820U true CN204142820U (en) | 2015-02-04 |
Family
ID=52419500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420539320.XU Active CN204142820U (en) | 2014-09-18 | 2014-09-18 | A kind of current detection circuit and board units |
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| Country | Link |
|---|---|
| CN (1) | CN204142820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110827425A (en) * | 2019-09-30 | 2020-02-21 | 北京握奇数据股份有限公司 | Intelligent card detecting and reading method and device for OBU |
-
2014
- 2014-09-18 CN CN201420539320.XU patent/CN204142820U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110827425A (en) * | 2019-09-30 | 2020-02-21 | 北京握奇数据股份有限公司 | Intelligent card detecting and reading method and device for OBU |
| CN110827425B (en) * | 2019-09-30 | 2021-04-27 | 北京握奇数据股份有限公司 | Intelligent card detecting and reading method and device for OBU |
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