CN207182120U - A kind of rotating speed process circuit based on PWM adjusting threshold voltages - Google Patents
A kind of rotating speed process circuit based on PWM adjusting threshold voltages Download PDFInfo
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- CN207182120U CN207182120U CN201721219471.7U CN201721219471U CN207182120U CN 207182120 U CN207182120 U CN 207182120U CN 201721219471 U CN201721219471 U CN 201721219471U CN 207182120 U CN207182120 U CN 207182120U
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Abstract
The utility model discloses a kind of rotating speed process circuit based on PWM adjusting threshold voltages, and it is made up of 1 PWM adjusting threshold voltages circuit and 1 hysteresis voltage comparator circuit.PWM adjusting threshold voltages circuit includes reverse driven reverse driven reverse driven U2AA, resistance R6, resistance R7, resistance R8, resistance R9；Capacitance C4, electric capacity C5, electric capacity C6, electric capacity C7；Hysteresis voltage comparator circuit includes comparator U1A；Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5；Capacitance C1, electric capacity C2, electric capacity C3；Voltage-stabiliser tube Z1；The utility model mainly using hysteresis loop comparator circuit collection input signal Hall-type PWM square waves or magneto-electric sine wave, can effectively prevent pulse signal from being beated near the threshold point that comparator is set, increase jamproof ability.Control output PWM square wave patterns that hysteresis loop comparator threshold voltage is set by single-chip microcomputer, compatibility, reversion hysteresis threshold accuracy and system flexibility in vehicle speed sensor hardware circuit design can be effectively improved.
Description
Technical field
It the utility model is related to a kind of rotating speed process circuit based on PWM adjusting threshold voltages, more particularly to automotive electronics
Speed and engine rotational speed signal processing technology field.
Background technology
Speed or tach signal are typically all Hall-type PWM square waves or the sinusoidal output of magneto-electric, are adopted using hysteresis loop comparator
Collect input signal, can effectively prevent pulse signal from being beated near the threshold point that comparator is set, increase jamproof energy
Power.But many times Hall or magneto-electric vehicle speed sensor signal hardware process circuit use the electric resistance partial pressure side of fixed resistance value
Formula sets the voltage threshold of comparator, and compatibility and the Vehicular system matching to hardware circuit cause very big inconvenience.This
Patent proposes a kind of rotating speed process circuit based on PWM adjusting threshold voltages, by single-chip microcomputer control output PWM square wave patterns come
Threshold voltage is set, the compatibility in vehicle speed sensor hardware circuit design, reversion hysteresis threshold accuracy can be effectively improved and be
System flexibility.
The content of the invention
The utility model is directed to existing technical problem, there is provided a kind of rotating speed processing electricity based on PWM adjusting threshold voltages
Road, it is therefore an objective to improve compatibility, reversion hysteresis threshold accuracy and the system flexibility in vehicle speed sensor hardware circuit design, intend
Solve the problems, such as that prior art is present.
To achieve the above object, the utility model provides following technical scheme：It is a kind of to be turned based on PWM adjusting threshold voltages
Fast process circuit, it is characterised in that：It is made up of 1 PWM adjusting threshold voltages circuit and 1 hysteresis voltage comparator circuit；
The PWM adjusting threshold voltages circuit includes reverse driven U2A, resistance R6, resistance R7, resistance R8, resistance R9；
Electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7；
The reverse driven U2A the 1st, 2 pins meet SCM PWM output port ETPU_A12, the 14th pin connects
VCC, the 8th pin connect GND, the 3rd pin difference connecting resistance R9 and resistance R7 one end；
Described resistance R9 one end meets the pins of reverse driven U2A the 3rd, another termination GND；
Described resistance R7 one end connects the pins of reverse driven U2A the 3rd, another termination capacitor C6 of the resistance R7, electric capacity C7
GND is concatenated after parallel connection；
At the termination capacitor C6 of resistance R8 mono-, electric capacity C7 parallel connection, another pins of termination comparator U1A the 2nd；
At the termination capacitor C6 of resistance R6 mono-, electric capacity C7 parallel connection, the other end meets single-chip microcomputer AD conversion interface AN25；
Electric capacity C5 mono- the terminating resistor R6, another termination GND；
The hysteresis voltage comparator circuit includes comparator U1A, resistance R1, resistance R2, resistance R3, resistance R4, resistance
R5, electric capacity C1, electric capacity C2, electric capacity C3, voltage-stabiliser tube Z1；
The pins of comparator U1A the 1st meet SCM PWM input port ETPU_A14, the 2nd pin connecting resistance R8 one end,
3rd pin connecting resistance R3 one end, the 8th pin meet VCC, and the 4th pin meets GND；
The resistance R1 mono- terminates VC C, another termination input Hall-type PWM square waves or magneto-electric sine wave；
Resistance R2 mono- the terminating resistor R1, another terminating resistor R3；
The electric capacity C1 and Z1 latter terminating resistor R2 in parallel, other end meet GND；
The terminating resistor R2 of resistance R3 mono-, other end connect the pins of comparator U1A the 3rd；
The terminating resistor R3 of resistance R5 mono-, other end connect the pins of comparator U1A the 1st；
The resistance R4 mono- terminates VCC, and other end connects the pins of comparator U1A the 1st；
The electric capacity C2, electric capacity C3 latter termination VCC in parallel, other end meet GND.
Further, preferably, adjustable voltage exports volt circuit, PWM square waves are exported by SCM PWM port, by anti-
Increase fan-out capability, then the R C formed by resistance R7 and electric capacity C6, electric capacity C7 to device reverse driven reverse driven U2AA
LPF produces stable voltage output, sets U1A hysteresis voltage threshold, and then voltage signal passes through resistance R6 and electric capacity
The AD ports that the R C LPFs of C5 compositions feed back to single-chip microcomputer carry out PID closed-loop controls.
Further, preferably, hysteresis voltage comparator circuit, input signal Hall-type PWM square waves or magneto-electric are sinusoidal
Ripple is pulled upward to VCC through pull-up resistor resistance R1, and hysteresis ratio is carried out to comparator U1A by the amplitude limiter circuit of resistance R2 and Z1 composition
Compared with.
Compared with prior art, the beneficial effects of the utility model are：
A) different rotating speeds, the magneto-electric of different voltage magnitudes and Hall-type signal acquisition are applicable, can be applicable under the slow-speed of revolution
Signal amplitude is small, and and can is applicable the situation that signal amplitude is big under high rotating speed.
B) it is used for different manufacturers and different types of sensor matching, improves the compatibility of hardware circuit.
C) the AD mouths of single-chip microcomputer are fed back to using PWM output adjustable voltages, improve output voltage threshold accuracy.
D) using the adjustable hysteresis voltage difference of threshold voltage is exported, hysteresis pressure difference is bigger, and antijamming capability is stronger, improves
System EMC.
E) circuit design is simple, has higher cost advantage and cost performance.
Brief description of the drawings
Fig. 1 be a kind of rotating speed process circuit based on PWM adjusting threshold voltages of the present utility model hysteresis voltage ratio compared with
Device electrical block diagram；
Fig. 2 is that a kind of PWM of rotating speed process circuit based on PWM adjusting threshold voltages of the present utility model adjusts threshold value
Potential circuit structural representation.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Fig. 1-2 is referred to, the utility model provides a kind of technical scheme：A kind of rotating speed based on PWM adjusting threshold voltages
Process circuit, it is characterised in that：It is made up of 1 PWM adjusting threshold voltages circuit and 1 hysteresis voltage comparator circuit；
The PWM adjusting threshold voltages circuit includes reverse driven U2A, resistance R6, resistance R7, resistance R8, resistance R9；
Electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7；
The reverse driven U2A the 1st, 2 pins meet SCM PWM output port ETPU_A12, the 14th pin connects
VCC, the 8th pin connect GND, the 3rd pin difference connecting resistance R9 and resistance R7 one end；
Described resistance R9 one end meets the pins of reverse driven U2A the 3rd, another termination GND；
Described resistance R7 one end connects the pins of reverse driven U2A the 3rd, another termination capacitor C6 of the resistance R7, electric capacity C7
GND is concatenated after parallel connection；
At the termination capacitor C6 of resistance R8 mono-, electric capacity C7 parallel connection, another pins of termination comparator U1A the 2nd；
At the termination capacitor C6 of resistance R6 mono-, electric capacity C7 parallel connection, the other end meets single-chip microcomputer AD conversion interface AN25；
Electric capacity C5 mono- the terminating resistor R6, another termination GND；
The hysteresis voltage comparator circuit includes comparator U1A, resistance R1, resistance R2, resistance R3, resistance R4, resistance
R5, electric capacity C1, electric capacity C2, electric capacity C3, voltage-stabiliser tube Z1；
The pins of comparator U1A the 1st meet SCM PWM input port ETPU_A14, the 2nd pin connecting resistance R8 one end,
3rd pin connecting resistance R3 one end, the 8th pin meet VCC, and the 4th pin meets GND；
The resistance R1 mono- terminates VC C, another termination input Hall-type PWM square waves or magneto-electric sine wave；
Resistance R2 mono- the terminating resistor R1, another terminating resistor R3；
The electric capacity C1 and Z1 latter terminating resistor R2 in parallel, other end meet GND；
The terminating resistor R2 of resistance R3 mono-, other end connect the pins of comparator U1A the 3rd；
The terminating resistor R3 of resistance R5 mono-, other end connect the pins of comparator U1A the 1st；
The resistance R4 mono- terminates VCC, and other end connects the pins of comparator U1A the 1st；
The electric capacity C2, electric capacity C3 latter termination VCC in parallel, other end meet GND.
In the present embodiment, as illustrated, adjustable voltage exports volt circuit, PWM square waves are exported by SCM PWM port,
Increase fan-out capability by reverser reverse driven reverse driven U2AA, then by resistance R7 and electric capacity C6, electric capacity C7 groups
Into R C LPFs produce stable voltage output, U1A hysteresis voltage threshold is set, and then voltage signal passes through resistance
The AD ports that the R C LPFs of R6 and electric capacity C5 compositions feed back to single-chip microcomputer carry out PID closed-loop controls.Hysteresis voltage comparator
Circuit, input signal Hall-type PWM square waves or magneto-electric sine wave are pulled upward to VCC through pull-up resistor resistance R1, pass through resistance R2
With the amplitude limiter circuit of Z1 compositions hysteresis comparison is carried out to comparator U1A.
In fig. 2,0 ~ 5V square-wave signals are exported using SCM PWM port ETPU_A12, increased by reverser U2A defeated
Output capacity, then the RC LPFs formed by resistance R7 and electric capacity C6, electric capacity C7 produce stable voltage output, then voltage
The AD ports that signal feeds back to single-chip microcomputer by the RC LPFs of resistance R6 and electric capacity C5 compositions carry out PID closed-loop controls, can
To realize comparator threshold voltage dynamic regulation, then it is connected with hysteresis loop comparator in figure and one kind can be achieved based on PWM regulation thresholds
The rotating speed process circuit of threshold voltage.In theory,For SCM PWM port
Output frequency, Duty are SCM PWM port output duty cycle.
The utility model is applicable different rotating speeds, the magneto-electric of different voltage magnitudes and Hall-type signal acquisition, can be applicable
Signal amplitude is small under the slow-speed of revolution, and and can is applicable the situation that signal amplitude is big under high rotating speed.For different manufacturers and different types of
Sensor matching, the compatibility of hardware circuit is improved, the AD mouths of single-chip microcomputer are fed back to using PWM output adjustable voltages, are improved
Output voltage threshold accuracy, hysteresis voltage difference is can adjust using threshold voltage is exported, hysteresis pressure difference is bigger, antijamming capability is got over
By force, system EMC is improved, the utility model circuit design is simple, has higher cost advantage and cost performance.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (3)
- A kind of 1. rotating speed process circuit based on PWM adjusting threshold voltages, it is characterised in that：By 1 PWM adjusting threshold voltages electricity Road and 1 hysteresis voltage comparator circuit are formed；The PWM adjusting threshold voltages circuit includes reverse driven U2A, resistance R6, resistance R7, resistance R8, resistance R9；Electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7；The reverse driven U2A the 1st, 2 pins meet SCM PWM output port ETPU_A12, the 14th pin meets VCC, 8th pin connects GND, the 3rd pin difference connecting resistance R9 and resistance R7 one end；Described resistance R9 one end meets the pins of reverse driven U2A the 3rd, another termination GND；Described resistance R7 one end connects the pins of reverse driven U2A the 3rd, and another termination capacitor C6 of the resistance R7, electric capacity C7 are in parallel After concatenate GND；At the termination capacitor C6 of resistance R8 mono-, electric capacity C7 parallel connection, another pins of termination comparator U1A the 2nd；At the termination capacitor C6 of resistance R6 mono-, electric capacity C7 parallel connection, the other end meets single-chip microcomputer AD conversion interface AN25；Electric capacity C5 mono- the terminating resistor R6, another termination GND；The hysteresis voltage comparator circuit includes comparator U1A, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity Hold C1, electric capacity C2, electric capacity C3, voltage-stabiliser tube Z1；The pins of comparator U1A the 1st meet SCM PWM input port ETPU_A14, the 2nd pin connecting resistance R8 one end, and the 3rd Pin connecting resistance R3 one end, the 8th pin meet VCC, and the 4th pin meets GND；The resistance R1 mono- terminates VC C, another termination input Hall-type PWM square waves or magneto-electric sine wave；Resistance R2 mono- the terminating resistor R1, another terminating resistor R3；The electric capacity C1 and Z1 latter terminating resistor R2 in parallel, other end meet GND；The terminating resistor R2 of resistance R3 mono-, other end connect the pins of comparator U1A the 3rd；The terminating resistor R3 of resistance R5 mono-, other end connect the pins of comparator U1A the 1st；The resistance R4 mono- terminates VCC, and other end connects the pins of comparator U1A the 1st；The electric capacity C2, electric capacity C3 latter termination VCC in parallel, other end meet GND.
- A kind of 2. rotating speed process circuit based on PWM adjusting threshold voltages according to claim 1, it is characterised in that：Can Voltage output volt circuit is adjusted, PWM square waves are exported by SCM PWM port, by reverser reverse driven reverse driven U2AA increases fan-out capability, then defeated by the stable voltage of the R C LPFs generation of resistance R7 and electric capacity C6, electric capacity C7 composition Go out, U1A hysteresis voltage threshold is set, then voltage signal feeds back by the R C LPFs of resistance R6 and electric capacity C5 compositions PID closed-loop controls are carried out to the AD ports of single-chip microcomputer.
- A kind of 3. rotating speed process circuit based on PWM adjusting threshold voltages according to claim 1：Hysteresis voltage comparator Circuit, input signal Hall-type PWM square waves or magneto-electric sine wave are pulled upward to VCC through pull-up resistor resistance R1, pass through resistance R2 With the amplitude limiter circuit of Z1 compositions hysteresis comparison is carried out to comparator U1A.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219471.7U CN207182120U (en) | 2017-09-22 | 2017-09-22 | A kind of rotating speed process circuit based on PWM adjusting threshold voltages |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721219471.7U CN207182120U (en) | 2017-09-22 | 2017-09-22 | A kind of rotating speed process circuit based on PWM adjusting threshold voltages |
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| CN207182120U true CN207182120U (en) | 2018-04-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213513A (en) * | 2020-09-23 | 2021-01-12 | 陕西法士特齿轮有限责任公司 | Transmission rotating speed measuring device with specific filtering function and measuring distance adjusting function |
| CN113189905A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Magnetoelectric rotating speed processing system with adjustable reference threshold |
-
2017
- 2017-09-22 CN CN201721219471.7U patent/CN207182120U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213513A (en) * | 2020-09-23 | 2021-01-12 | 陕西法士特齿轮有限责任公司 | Transmission rotating speed measuring device with specific filtering function and measuring distance adjusting function |
| CN113189905A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Magnetoelectric rotating speed processing system with adjustable reference threshold |
| CN113189905B (en) * | 2021-04-15 | 2023-01-10 | 常州易控汽车电子股份有限公司 | Magnetoelectric rotating speed processing system with adjustable reference threshold |
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