CN103529232A - Interface circuit for wheel speed sensor of motor vehicle - Google Patents
Interface circuit for wheel speed sensor of motor vehicle Download PDFInfo
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- CN103529232A CN103529232A CN201310501370.9A CN201310501370A CN103529232A CN 103529232 A CN103529232 A CN 103529232A CN 201310501370 A CN201310501370 A CN 201310501370A CN 103529232 A CN103529232 A CN 103529232A
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- resistance
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- operational amplifier
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- motor vehicle
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Abstract
The invention discloses an interface circuit for a wheel speed sensor of a motor vehicle. The interface circuit comprises an operational amplifier, a capacitor C, a resistor R1, a resistor R2, a bidirectional conducting diode D, a resistor R3 and a resistor R4, wherein the bidirectional conducting diode D is connected onto the non-inverting input end of the operational amplifier; the resistor R3 and the resistor R4 are connected in series and then connected onto the output end of the bidirectional conducting diode D at one end, the other end is grounded, common terminals of the resistor R3 and the resistor R4 are connected onto the inverted input end of the operational amplifier; one end of the resistor R1 is connected with the non-inverting input end of the operational amplifier; and one end of the resistor R2 and one end of the capacitor C are connected to two ends of the resistor R1 respectively, and the other end of the resistor R2 and the other end of the capacitor C are connected and grounded together. The interface circuit for the wheel speed sensor of the motor vehicle has the advantages that the performance is good, the circuit structure is simple, and the area of a circuit board can be reduced.
Description
Technical field
The present invention relates to a kind of integrated circuit, relate in particular a kind of interface circuit for motor vehicle wheel speed sensor.
Background technology
Motor vehicle by propulsion system, driven or draw, on road, travel, for riding or (with) conveying articles or move the wheeled vehicle two of special operation.Motor vehicle is as people's walking-replacing tool, and its popularity rate is more and more higher.The safety coefficient of motor vehicle, concerning travelling, is vital.When the ruuning situation of vehicle is monitored, need to monitor many kinds of parameters, so that human pilot has enough understandings to the situation of vehicle, guarantee traffic safety.Sensor, after wheel speed data are gathered, need send data to data handling system by interface circuit.It comprises multiple circuit structure existing interface circuit, as shown in Figure 2, comprises filtering circuit and comparator circuit, and its filtering circuit comprises operational amplifier, resistance, electric capacity etc., and comparator circuit comprises resistance and operational amplifier, and its circuit structure is complicated.
Summary of the invention
The invention provides a kind of interface circuit for motor vehicle wheel speed sensor, it is functional, and circuit structure is simple, can reduce the area of circuit board.
For solving above-mentioned technical matters, the present invention by the following technical solutions:
For the interface circuit of motor vehicle wheel speed sensor, it comprises operational amplifier, capacitor C, resistance R 1, resistance R 2, two-way admittance diode D, resistance R 3 and resistance R 4; Described two-way admittance diode is connected on the in-phase input end of operational amplifier; After described resistance R 3 and resistance R 4 series connection, one end is connected on the output terminal of two-way admittance diode D, other end ground connection, and the common port of resistance R 3 and resistance R 4 is connected on the inverting input of operational amplifier; Described one end of resistance R 1 and the in-phase input end of operational amplifier are connected; Described one end of resistance R 2 and one end of capacitor C are connected to the two ends of resistance R 1, and the other end of the resistance R 2 and other end of capacitor C is connected and ground connection simultaneously.
Further technical scheme is:
As preferably, described resistance R 3 and the resistance value ratio of resistance R 4 are 3:1.
Further, the Standard resistance range of described resistance R 4 is 500 ohm-1000 ohm.
As preferably, described operational amplifier is LMX324.
The present invention includes filtering circuit, voltage clamp circuit and feedback circuit, filtering circuit is simpler than its circuit of existing interface circuit.And the electronic devices and components that the quantity of the electronic devices and components that whole circuit is used is used compared to existing interface circuit, its quantity is few, simple in structure.
Compared with prior art, the invention has the beneficial effects as follows:
Interface circuit of the present invention comprises filtering circuit, voltage clamp circuit and feedback circuit, and it is functional, realize transmission and the processing of data, and its circuit structure is simple, can effectively reduce the integrated area of circuit board.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the circuit theory diagrams of existing interface circuit.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Embodiments of the present invention include but not limited to the following example.
[embodiment]
The interface circuit for motor vehicle wheel speed sensor as shown in Figure 1, it comprises operational amplifier, capacitor C, resistance R 1, resistance R 2, two-way admittance diode D, resistance R 3 and resistance R 4; Described two-way admittance diode is connected on the in-phase input end of operational amplifier; After described resistance R 3 and resistance R 4 series connection, one end is connected on the output terminal of two-way admittance diode D, other end ground connection, and the common port of resistance R 3 and resistance R 4 is connected on the inverting input of operational amplifier; Described one end of resistance R 1 and the in-phase input end of operational amplifier are connected; Described one end of resistance R 2 and one end of capacitor C are connected to the two ends of resistance R 1, and the other end of the resistance R 2 and other end of capacitor C is connected and ground connection simultaneously.
Described resistance R 3 and the resistance value ratio of resistance R 4 are 3:1.Proportionate relationship between resistance R 3 and resistance R 4 is greater than 1, but better for the stability of whole circuit, preferred ratio is 3.
The Standard resistance range of described resistance R 4 is 500 ohm-1000 ohm.
Described operational amplifier is LMX324.LM324 family device is with the four-operational amplifier of differential input.It has lot of advantages, for example: the input of work mould comprises negative supply, can eliminate the necessity that many application scenarios adopt external bias element, its high-gain.
In the present invention, capacitor C, resistance R 1 and resistance R 2 form input filter circuit, and the signal of input is carried out to filtering processing; Two-way admittance diode D carries out clamper to input voltage, and operational amplifier and circuit are protected, and avoids overtension to damage operational amplifier or circuit; Resistance R 3 and resistance R 4 forms feedback circuits, makes input signal and output signal and resistance R 3 and the proportional relation of resistance R 4 of the inverting input of operational amplifier, stability that can intensifier circuit;
Be as mentioned above embodiments of the invention.The present invention is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (4)
1. for the interface circuit of motor vehicle wheel speed sensor, it is characterized in that: it comprises operational amplifier, capacitor C, resistance R 1, resistance R 2, two-way admittance diode D, resistance R 3 and resistance R 4; Described two-way admittance diode is connected on the in-phase input end of operational amplifier; After described resistance R 3 and resistance R 4 series connection, one end is connected on the output terminal of two-way admittance diode D, other end ground connection, and the common port of resistance R 3 and resistance R 4 is connected on the inverting input of operational amplifier; Described one end of resistance R 1 and the in-phase input end of operational amplifier are connected; Described one end of resistance R 2 and one end of capacitor C are connected to the two ends of resistance R 1, and the other end of the resistance R 2 and other end of capacitor C is connected and ground connection simultaneously.
2. the interface circuit for motor vehicle wheel speed sensor according to claim 1, is characterized in that: described resistance R 3 and the resistance value ratio of resistance R 4 are 3:1.
3. the interface circuit for motor vehicle wheel speed sensor according to claim 2, is characterized in that: the Standard resistance range of described resistance R 4 is 500 ohm-1000 ohm.
4. the interface circuit for motor vehicle wheel speed sensor according to claim 1, is characterized in that: described operational amplifier is LMX324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310501370.9A CN103529232A (en) | 2013-10-23 | 2013-10-23 | Interface circuit for wheel speed sensor of motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310501370.9A CN103529232A (en) | 2013-10-23 | 2013-10-23 | Interface circuit for wheel speed sensor of motor vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103529232A true CN103529232A (en) | 2014-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310501370.9A Pending CN103529232A (en) | 2013-10-23 | 2013-10-23 | Interface circuit for wheel speed sensor of motor vehicle |
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| Country | Link |
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| CN (1) | CN103529232A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137123A (en) * | 2014-04-16 | 2015-12-09 | 株式会社万都 | Signal processing device for wheel speed sensor |
| CN109141495A (en) * | 2018-06-28 | 2019-01-04 | 华为技术有限公司 | Sensor interface apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09119864A (en) * | 1994-09-28 | 1997-05-06 | Murata Mfg Co Ltd | Signal processor for pyroelectric infrared sensor |
| CN101178581A (en) * | 2007-09-19 | 2008-05-14 | 同济大学 | Integrated control device and method of motorcar chassis |
| CN202178830U (en) * | 2011-06-08 | 2012-03-28 | 北京中科美伦科技有限公司 | Amplifying device for CCD image signal |
| CN102435781A (en) * | 2011-10-28 | 2012-05-02 | 奇瑞汽车股份有限公司 | Collecting circuit for wheel speed of vehicle |
| US8482338B1 (en) * | 2005-10-13 | 2013-07-09 | Marvell International Ltd. | Shock detector with DC offset suppression using internal components |
-
2013
- 2013-10-23 CN CN201310501370.9A patent/CN103529232A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09119864A (en) * | 1994-09-28 | 1997-05-06 | Murata Mfg Co Ltd | Signal processor for pyroelectric infrared sensor |
| US8482338B1 (en) * | 2005-10-13 | 2013-07-09 | Marvell International Ltd. | Shock detector with DC offset suppression using internal components |
| CN101178581A (en) * | 2007-09-19 | 2008-05-14 | 同济大学 | Integrated control device and method of motorcar chassis |
| CN202178830U (en) * | 2011-06-08 | 2012-03-28 | 北京中科美伦科技有限公司 | Amplifying device for CCD image signal |
| CN102435781A (en) * | 2011-10-28 | 2012-05-02 | 奇瑞汽车股份有限公司 | Collecting circuit for wheel speed of vehicle |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137123A (en) * | 2014-04-16 | 2015-12-09 | 株式会社万都 | Signal processing device for wheel speed sensor |
| CN105137123B (en) * | 2014-04-16 | 2018-05-01 | 株式会社万都 | The signal processing apparatus of wheel speed sensors |
| CN109141495A (en) * | 2018-06-28 | 2019-01-04 | 华为技术有限公司 | Sensor interface apparatus |
| CN109141495B (en) * | 2018-06-28 | 2020-10-09 | 华为技术有限公司 | Sensor interface device |
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Application publication date: 20140122 |