CN204575671U - A kind of change-over circuit of wheel spin-up transducer - Google Patents
A kind of change-over circuit of wheel spin-up transducer Download PDFInfo
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- CN204575671U CN204575671U CN201520179855.5U CN201520179855U CN204575671U CN 204575671 U CN204575671 U CN 204575671U CN 201520179855 U CN201520179855 U CN 201520179855U CN 204575671 U CN204575671 U CN 204575671U
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Abstract
The utility model provides a kind of change-over circuit of wheel spin-up transducer, comprise voltage comparator circuit and signal coupling circuit, input signal is coupled to voltage comparator circuit by signal coupling circuit, and voltage comparator circuit exports the equal pulse signal of a positive and negative time width.The utility model overcomes in speed sensor circuit in the past can only the shortcoming of sine wave output signal, directly can export square wave, ensure that the consistance of high-low level time width.
Description
Technical field
The invention belongs to wheel spin-up transducer to test the speed field, particularly the pulse modulate circuit of wheel spin-up transducer.
Background technology
Along with the application of electronic anti-skid braking system technology reaches its maturity, this system all installed by a large amount of aircraft at present, wheel spin-up transducer is as a vitals of electronic anti-skid braking system, for experiencing the speed of wheel, and the frequency signal that generation is directly proportional to wheel rate signal passes to controller, how much determined whether braking according to frequency signal by controller, as can be seen here, the quality of wheel spin-up transducer and measuring accuracy height, to the normal work important of brake system.
The speed pickup of conventional braking system mainly contains inertial sensor, excitation sensor and permanent magnet sensor, and its principle of work is different, respectively has its relative merits.Inertial sensor is primarily of the part such as flywheel, electric switch composition complex structure and without remaining, excitation sensor is relative with permanent magnet sensor structure simple, but limits by magnet steel volume, and low speed copies lower, output signal is easily subject to ectocine, and antijamming capability is poor.
In order to the needs of satisfied different controller, a kind of light electricity velocity sensor need be designed, compare with general sensor and have the following advantages: be applied widely, meet different system needs; Low speed amplitude is high; Direct output square-wave signal.For this reason, need design a kind of change-over circuit and load in light electricity velocity sensor, its performance quality will directly affect output of products characteristic.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of change-over circuit of wheel spin-up transducer.
The technical solution adopted for the present invention to solve the technical problems is: comprise voltage comparator circuit and signal coupling circuit, input signal is coupled to voltage comparator circuit by signal coupling circuit, and voltage comparator circuit exports the equal pulse signal of a positive and negative time width.
Described voltage comparator circuit adopts voltage comparator or integrated operational amplifier.
Described voltage comparator circuit is operated in open loop situations, adopts integrated operational amplifier or the voltage comparator of rail-to-rail input and output.
Described signal coupling circuit is made up of resistance-capacitance network.
Described signal coupling circuit comprises and connect resistance R1 and electric capacity C1, No. two resistance R2 and No. three resistance R3 also connect formation biasing circuit, reference voltage Verf is connected two input ends of voltage comparator circuit respectively by No. two resistance R2 and No. three resistance R3, and input signal inputs the tie point of No. two resistance R2 and voltage comparator circuit by signal coupling circuit.
Described reference voltage Verf is taken as 0.4 ~ 0.6 times of supply voltage and remains constant, and the resistance of a resistance R1 is more than 10 times of No. two resistance R2 resistances, and the error of No. two resistance R2 and No. three resistance R3 is less than 1%, and electric capacity C1 adopts Leaded Ceramic Disc Capacitor.
The invention has the beneficial effects as follows: overcoming in speed sensor circuit in the past can only the shortcoming of sine wave output signal, directly can export square wave, ensure that the consistance of high-low level time width.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described, the present invention includes but be not limited only to following embodiment.
The invention provides AC analogue signal in a kind of speed probe, to the change-over circuit of pulse signal, to be made up of voltage comparator circuit and signal coupling circuit two parts.Described voltage comparator circuit is made up of voltage comparator or integrated operational amplifier and peripheral circuit; Described signal coupling circuit is made up of resistance-capacitance network.
Voltage comparator circuit described in the present invention is operated in open loop situations.Adopt operational amplifier or the voltage comparator of rail-to-rail input and output, ensure the voltage range exporting pulse.
Signal coupling circuit of the present invention is made up of resistance-capacitance network, rational build-out resistor capacitance size, and signal coupling can be made to be applicable to from the slow-speed of revolution to the FR requirement of high rotating speed.
The present invention is used for the signaling conversion circuit of speed probe, utilizes resistance-capacitance network coupled signal to voltage comparator circuit, thus obtains the substantially equal pulse signal of a positive and negative time width at output terminal.
As shown in Figure 1, Verf is the reference voltage in circuit, is set in the half neighbouring (being generally taken as 0.4 ~ 0.6 times of supply voltage) of supply voltage and remains constant.R1, C1 form signal coupling network, and R2, R3 form biasing circuit.R1>>R2 (R1 is more than 10 times of R2), R2 ≈ R3 (error of R2 and R3 is less than 1%) in circuit.When the slow-speed of revolution, signal is mainly coupled to rear class through resistance R1; Then mainly during high rotating speed be coupled to rear class through C1.Required pulse signal is obtained after voltage comparator circuit.Whole circuit is simple and reliable, and metalfilmresistor used is 1% precision; Capacitor adopts Leaded Ceramic Disc Capacitor, nonpolarity and reliability is high.
Claims (6)
1. the change-over circuit of a wheel spin-up transducer, comprise voltage comparator circuit and signal coupling circuit, it is characterized in that: input signal is coupled to voltage comparator circuit by signal coupling circuit, voltage comparator circuit exports the equal pulse signal of a positive and negative time width.
2. the change-over circuit of wheel spin-up transducer according to claim 1, is characterized in that: described voltage comparator circuit adopts voltage comparator or integrated operational amplifier.
3. the change-over circuit of wheel spin-up transducer according to claim 1, is characterized in that: described voltage comparator circuit is operated in open loop situations, adopts integrated operational amplifier or the voltage comparator of rail-to-rail input and output.
4. the change-over circuit of wheel spin-up transducer according to claim 1, is characterized in that: described signal coupling circuit is made up of resistance-capacitance network.
5. the change-over circuit of wheel spin-up transducer according to claim 1, it is characterized in that: described signal coupling circuit comprises and connect resistance R1 and electric capacity C1, No. two resistance R2 and No. three resistance R3 also connect formation biasing circuit, reference voltage Verf is connected two input ends of voltage comparator circuit respectively by No. two resistance R2 and No. three resistance R3, and input signal inputs the tie point of No. two resistance R2 and voltage comparator circuit by signal coupling circuit.
6. the change-over circuit of wheel spin-up transducer according to claim 1, it is characterized in that: described reference voltage Verf is taken as 0.4 ~ 0.6 times of supply voltage and remains constant, the resistance of a resistance R1 is more than 10 times of No. two resistance R2 resistances, the error of No. two resistance R2 and No. three resistance R3 is less than 1%, and electric capacity C1 adopts Leaded Ceramic Disc Capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520179855.5U CN204575671U (en) | 2015-03-27 | 2015-03-27 | A kind of change-over circuit of wheel spin-up transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520179855.5U CN204575671U (en) | 2015-03-27 | 2015-03-27 | A kind of change-over circuit of wheel spin-up transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204575671U true CN204575671U (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520179855.5U Active CN204575671U (en) | 2015-03-27 | 2015-03-27 | A kind of change-over circuit of wheel spin-up transducer |
Country Status (1)
| Country | Link |
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| CN (1) | CN204575671U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403726A (en) * | 2015-12-17 | 2016-03-16 | 滁州市博创电气有限公司 | Pulse velocity measurement module |
| CN111478673A (en) * | 2020-04-22 | 2020-07-31 | 西安航空制动科技有限公司 | Signal conditioning circuit of wheel speed sensor |
-
2015
- 2015-03-27 CN CN201520179855.5U patent/CN204575671U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403726A (en) * | 2015-12-17 | 2016-03-16 | 滁州市博创电气有限公司 | Pulse velocity measurement module |
| CN111478673A (en) * | 2020-04-22 | 2020-07-31 | 西安航空制动科技有限公司 | Signal conditioning circuit of wheel speed sensor |
| CN111478673B (en) * | 2020-04-22 | 2023-03-14 | 西安航空制动科技有限公司 | Signal conditioning circuit of wheel speed sensor |
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