CN203691374U - Two-wire sensor interface circuit - Google Patents
Two-wire sensor interface circuit Download PDFInfo
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- CN203691374U CN203691374U CN201320832773.7U CN201320832773U CN203691374U CN 203691374 U CN203691374 U CN 203691374U CN 201320832773 U CN201320832773 U CN 201320832773U CN 203691374 U CN203691374 U CN 203691374U
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Abstract
The utility model relates to a two-wire sensor interface circuit which is respectively connected with a power line and a ground wire. The interface circuit comprises a detection chip, at least one sensor, a voltage conversation module, an analog-to-digital conversion module, a diode D1, a resistor R3 and control modules of which the number is same with that of the sensors. The control modules are corresponding to the sensors one by one. The detection chip is respectively connected to the voltage conversation module, each sensor and the each control module. The resistor R3 is connected to each control module and the positive pole of the diode D1 respectively through the power line. The negative pole of the diode D1 is connected to the voltage conversation module. The analog-to-digital conversion module is connected between the resistor R3 and the diode D1. Compared with the prior art, the two-wire sensor interface circuit has advantages of fewer wire harnesses and interfaces, and easy assembling.
Description
Technical field
The utility model relates to a kind of interface circuit, especially relates to a kind of two line sensor interface circuits.
Background technology
Along with the development of auto industry, the application of transducer is more and more, more and more general.In the time of design sensor application circuit.Domestic main employing four-wire system, i.e. transducer one holding wire, transducer binary signal line, power line, ground wire.
There is following shortcoming in the design of four-wire system:
1, adopt four-wire system, do not save wire harness;
2, need more interface;
3, four-wire circuit is more complicated, installs not easy.
Utility model content
The purpose of this utility model is exactly to provide a kind of in order to overcome the defect that above-mentioned prior art exists and reduced wire harness, reduced interface and be easy to two line sensor interface circuits of assembling.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of two line sensor interface circuits, this interface circuit respectively with power line, ground wire connects, it is characterized in that, described interface circuit comprises detection chip, at least one transducer, voltage transformation module, analog-to-digital conversion module, diode D1, resistance R 3 and the control module identical with number of sensors, each control module is corresponding one by one with each transducer, described detection chip respectively with voltage transformation module, each transducer, each control module connects, described resistance R 3 by power line respectively with each control module, diode D1 is anodal to be connected, the negative pole of described diode D1 is connected with voltage transformation module, described analog-to-digital conversion module is connected between resistance R 3 and diode D1.
Described control module comprises switching device and resistance, and the control end of described switching device is connected with detection chip, and the power end of described switching device is connected with power line by resistance, and remaining one end of described switching device is connected with ground wire.
Described switching device is triode, and control end is base stage, and power end is collector electrode/emitter, and remaining one end is connected with ground wire.
Described switching device is field effect transistor, and control end is grid, is drain/source power supply, and remaining one end is connected with ground wire.
When described sensor-triggered, described switching device conducting corresponding to this transducer of detection chip control.
The described capacitor C 1 that also comprises, these capacitor C 1 one ends are connected between the negative pole of diode D1 and the input of voltage transformation module, and the other end is connected between the earth terminal and ground wire of voltage transformation module.
Compared with prior art, the utlity model has and adopt two-wire system to replace four-wire system, saved like this wire harness, saved interface, and easy for installation, reduce the cost in Integral automobile design.
Accompanying drawing explanation
Fig. 1 is physical circuit figure of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Embodiment
Take two transducers as example, as shown in Figure 1, a kind of two line sensor interface circuits, this interface circuit is connected with power line Power line, ground wire Gnd line respectively, and described interface circuit comprises detection chip 2, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3, diode D1, voltage transformation module 1, analog-to-digital conversion module 5, first sensor 3 and the second transducer 4;
Described detection chip 2 respectively with voltage transformation module 1, first sensor 3, the second transducer 4, the base stage of triode Q1 is connected with the base stage of triode Q2, described resistance R 3 by power line respectively with resistance R 1 one end, resistance R 2 one end, diode D1 is anodal to be connected, described resistance R 1 other end is connected with the collector electrode of triode Q1, described resistance R 2 is connected with the collector electrode of triode Q2, the negative pole of described diode D1 is connected with voltage transformation module 1, described analog-to-digital conversion module 5 is connected between resistance R 3 and resistance R 1, the emitter of described triode Q1 is all connected with ground wire with the emitter of triode Q2.
Described detection chip 2 comprises voltage input end Vin1, voltage input end Vin2, voltage output end Vout1, voltage output end Vout2, first sensor interface and the second sensor interface, described voltage input end Vin1, voltage input end Vin2 are connected with voltage transformation module respectively, described voltage output end Vout1 is connected with the base stage of triode Q1, described voltage output end Vout2 is connected with the base stage of triode Q2, described first sensor interface is connected with first sensor 3, and the second described sensor interface is connected with the second transducer 4.
When described first sensor 1 triggers, described detection chip is controlled triode Q1 conducting by voltage output end Vout1, and when the second described transducer 2 triggers, described detection chip is controlled triode Q2 conducting by voltage output end Vout2.Once triode Q1 conducting, power line voltage is decided by the ratio of R3 and R1.If triode Q2 conducting, power line power supply is decided by the ratio of R3 and R2.Analog-to-digital conversion module 5 can detect voltage on power line, determines it is triode Q1 or triode Q2 conducting, and then determines it is that first sensor 3 or the second transducer 2 are triggered.
Described voltage transformation module 1 comprises voltage input end Vin, voltage output end Vout, the first earth terminal and the second earth terminal, described voltage input end Vin is connected with the negative pole of diode D1, described voltage output end Vout is connected with voltage input end Vin1, the first described earth terminal is connected with ground wire, and the second described earth terminal is connected with voltage input end Vin2.
The described capacitor C 1 that also comprises, these capacitor C 1 one ends are connected between the negative pole of diode D1 and the voltage input end Vin of voltage transformation module, and the other end is connected between first earth terminal and ground wire of voltage transformation module.
The power supply of this interface circuit is provided by power line power line, and diode D1 is rectified action, and power line, by voltage transformation module 1, converts the operating voltage of detection chip to.Capacitor C 1 is chip energy storage.In the time of triode Q1 and triode Q2 conducting, supply voltage can decline, if when supply voltage drops to the operating voltage lower than voltage transformation module, and system cisco unity malfunction.Capacitor C 1 is in order to guarantee that voltage transformation module normally works.If when voltage can not drop to the operating voltage of voltage transformation module, capacitor C 1 can not need.
Claims (6)
1. a line sensor interface circuit, this interface circuit respectively with power line, ground wire connects, it is characterized in that, described interface circuit comprises detection chip, at least one transducer, voltage transformation module, analog-to-digital conversion module, diode D1, resistance R 3 and the control module identical with number of sensors, each control module is corresponding one by one with each transducer, described detection chip respectively with voltage transformation module, each transducer, each control module connects, described resistance R 3 by power line respectively with each control module, diode D1 is anodal to be connected, the negative pole of described diode D1 is connected with voltage transformation module, described analog-to-digital conversion module is connected between resistance R 3 and diode D1.
2. two line sensor interface circuits according to claim 1, it is characterized in that, described control module comprises switching device and resistance, the control end of described switching device is connected with detection chip, the power end of described switching device is connected with power line by resistance, and remaining one end of described switching device is connected with ground wire.
3. two line sensor interface circuits according to claim 2, is characterized in that, described switching device is triode, and control end is base stage, and power end is collector electrode/emitter, and remaining one end is connected with ground wire.
4. two line sensor interface circuits according to claim 2, is characterized in that, described switching device is field effect transistor, and control end is grid, are drain/source power supply, and remaining one end is connected with ground wire.
5. two line sensor interface circuits according to claim 2, is characterized in that, when described sensor-triggered, and described switching device conducting corresponding to this transducer of detection chip control.
6. two line sensor interface circuits according to claim 1, it is characterized in that, also comprise capacitor C 1, these capacitor C 1 one ends are connected between the negative pole of diode D1 and the input of voltage transformation module, and the other end is connected between the earth terminal and ground wire of voltage transformation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320832773.7U CN203691374U (en) | 2013-12-17 | 2013-12-17 | Two-wire sensor interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320832773.7U CN203691374U (en) | 2013-12-17 | 2013-12-17 | Two-wire sensor interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691374U true CN203691374U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320832773.7U Expired - Fee Related CN203691374U (en) | 2013-12-17 | 2013-12-17 | Two-wire sensor interface circuit |
Country Status (1)
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| CN (1) | CN203691374U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716949A (en) * | 2013-12-17 | 2015-06-17 | 德尔福电子(苏州)有限公司 | Two-line sensor interface circuit |
-
2013
- 2013-12-17 CN CN201320832773.7U patent/CN203691374U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716949A (en) * | 2013-12-17 | 2015-06-17 | 德尔福电子(苏州)有限公司 | Two-line sensor interface circuit |
| CN104716949B (en) * | 2013-12-17 | 2018-09-28 | 安波福电子(苏州)有限公司 | A kind of two line sensor interface circuitries |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215126 No. 123 Changyang street, Suzhou Industrial Park, Suzhou, Jiangsu. Patentee after: Annex Electronics (Suzhou) Co., Ltd. Address before: 215126 No. 123 Changyang street, Suzhou Industrial Park, Suzhou, Jiangsu. Patentee before: Delphi Electronics (Suzhou) Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20181217 |
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| CF01 | Termination of patent right due to non-payment of annual fee |