CN107228952A - A kind of high reliability rotating speed transducer module - Google Patents
A kind of high reliability rotating speed transducer module Download PDFInfo
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- CN107228952A CN107228952A CN201710470727.XA CN201710470727A CN107228952A CN 107228952 A CN107228952 A CN 107228952A CN 201710470727 A CN201710470727 A CN 201710470727A CN 107228952 A CN107228952 A CN 107228952A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
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Abstract
The invention discloses a kind of high reliability rotating speed transducer module, including：Signal conditioning circuit, for the analog signal conditioner that exports speed probe to be into square-wave signal and exports and gives FPGA digital circuit；FPGA digital circuit, by improving the frequency information of cycle test method collection square-wave signal and being converted into corresponding data signal, is exported to current output circuit, while output switch amount signal gives excess revolutions protection circuit；Current output circuit, the current signal for rotating speed data signal to be converted to 4~20mA is exported；Excess revolutions protection circuit, drives the actuating of relay, and indicate guard mode by luminous tube according to the on-off model of input.It is of the invention that the reliability for effectively increasing tachometric survey is designed using pure hardware circuit, have the advantages that precision is high, it is fast, safe and reliable to respond, while facilitating the long range transmission and the collection of control system of tach signal.
Description
Technical field
The present invention relates to a kind of high reliability rotating speed transducer module, belong to Rotating speed measring field.
Background technology
Tachometric survey is the most base tested the rotary-type dynamic power machine such as aero-engine, internal combustion engine, motor, controlled
This, most important task, its target is to obtain accurate, timely rotary speed information.Tachogenerator and rotating speed transducer are assembled
For a set of rotational speed monitor system, the real-time monitoring of the rotor speed of various rotating machineries is realized, and to rotor operation abnormality
React in time.For the higher equipment of level of security, such as nuclear power generating sets or emergency diesel-oil unit, rotating speed transducer can
Just seem particularly important by property and security.
In order to which rotational speed pulse signal is converted into current signal, conventional method is to use F/V translation circuits, i.e., by rotating speed
Pulse signal is converted into after voltage signal, is further converted into current signal, but F/V translation circuits there are low precision
The problems such as (particularly low frequency), low-response.Patent of invention CN20091021448.0 discloses a kind of rotor speed of turbo generator
Measuring method and its device, the patent using F/V change by pulse electrical signal be converted to voltage signal output so as to realize turn
Speed measurement, but F/V changes the shortcomings of there is low precision, low-response.
Although and the rotating speed transducer based on MCU microcontrollers can realize the accurate measurement and quick change of tach signal
Change, but there is software and run the Potential feasibility for flying, failing, program once failing, controller is difficult to have to rotor speed
, there is serious potential safety hazard in the control of effect.Patent of invention CN20111041622.6 discloses a kind of turbine speed measurement dress
Put and measuring method, three drive test frequency logics are divided into by CPLD rotation speed measuring modules, control module is conveyed to after updating rotating speed, but
Control module employs microprocessor, it is understood that there may be program fleet, the risk of failure.Patent of invention CN20131032656.6 is public
A kind of Rotate Speed Measure System for Hydro-turbine Generator has been opened, the measuring precision is improved using DSP operation module and D/A modular converters
And antijamming capability, but DSP operation module can also have the potential problems such as program fleet, failure.
The rotating speed transducer designed using pure hardware circuit, without micro controller unit, is also avoided software program and gone out
Wrong risk, is greatly improved the reliability of rotational speed monitor system, it is adaptable to the higher application scenario of reliability requirement.Therefore,
Those skilled in the art are directed to developing a kind of high reliability rotating speed transducer module of use pure hardware circuit design, are ensureing
Have the advantages that precision is high, it is fast to respond while high reliability.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of high reliability rotating speed pick-up
Device module, has the advantages that precision is high, it is fast, safe and reliable to respond, tachometric survey is effectively improved using pure hardware circuit design
Reliability, while facilitating the long range transmission and the collection of control system of tach signal.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
A kind of high reliability rotating speed transducer module, including：
Power-supplying circuit, including two DC-DC insulating power supply circuits, by 24V dc sources be respectively converted into ± 5V and
15V voltage outputs and realize power supply；
Signal conditioning circuit, for the analog signal conditioner that exports speed probe to be into square-wave signal and exports to can compile
Journey logic digital circuits；
FPGA (FPGA) digital circuit, for gathering the frequency information of square-wave signal and being converted into corresponding
Data signal, is exported to current output circuit, while output switch amount signal gives excess revolutions protection circuit；
Current output circuit, the current signal for the data signal of input to be converted to 4~20mA is exported；
Excess revolutions protection circuit, the actuating of relay is driven according to the on-off model of input, to control the switch of rotor circuit,
And guard mode is indicated by luminous tube.
Remote transmission is carried out with constant current source signal (such as 4~20mA current signals), as long as transmission loop occurs without branch, electricity
Electric current in road would not change with electric wire length, it is ensured that the precision of transmission signal.In addition, 4~20mA signals is electric
Zero point is 4mA, is not overlapped with mechanical zero, is conducive to the failures such as identification power-off and broken string.The signal one of speed probe collection
As be sinusoidal signal (such as magnetoelectric tachometric transducer) or square-wave signal (such as Hall revolution speed transducer) voltage signal, due to existing
The distance between field and control room are remote, the impedance of connection cables causes greatly voltage signal to occur larger decline in transmitting procedure
Subtract, so as to cause measurement error.
It is preferred that, the signal conditioning circuit includes coupled capacitor, filter circuit, clamp diode, the difference being sequentially communicated
Divide amplifier, hysteresis comparator and transistor；Specifically circuit flow is：
The analog signal of speed probe output first passes through coupled capacitor and removes DC component, then circuit is removed after filtering
High-frequency Interference, then passes through the clamping action of clamp diode and is amplified by difference amplifier, finally by hysteresis comparator
More afterwards through transistor level conversion, the standard block signal for exporting 0~3.3V gives FPGA digital circuit.
It is preferred that, the speed probe uses magnetoelectric tachometric transducer or hall-effect speed sensor, and signal is adjusted
Reason circuit is that magnetoelectric tachometric transducer does not need rotating speed to become by switching the sensor type that selection is connected into, its main distinction
Device module for power supply is sent, Hall sensor needs rotating speed transducer module to provide operating voltage.
It is preferred that, it is low and high level that the FPGA digital circuit, which is exported to the on-off model of excess revolutions protection circuit,
Signal, to realize simple efficient control.
It is preferred that, the FPGA digital circuit is used based on the improved cycle test method collection square-wave signal of principle of inertia
Frequency information and be converted into corresponding data signal, the improvement cycle test method comprises the following steps：
Step A：The square-wave signal that signal conditioning circuit is inputted is divided, divided signal is then measured and each counts
The number of cycle internal standard pulse (i.e. clock pulses), i.e. count value X1, X2... Xn；
Step B：Using tolling measurement mode, that is, choose recent renewal m counts cycle count value Xn-m, Xn-m+1... Xn
As rolling parameters sequence, and ask its average value, i.e. roll count value
Step C：To currently real-time count value XnWith roll count valueIt is compared, if both deviations are more than in fact
When count value Xn1/64, then choose real-time counting value XnNext step calculating is carried out as count value X, otherwise selection, which is rolled, counts
Value
Step D：The count value X by obtained by is calculated as the division logic in formula (a) and is converted to corresponding digital quantity Q, and
Exported by SPI communication to current output circuit；Formula (a) is：
Wherein, dividend A is setting value.
Be using tolling measurement mode in order to prevent impulse generator (phonic wheel) mismachining tolerance produce tachometric survey in count
Error, chooses nearest m and counts cycle count value as rolling parameters sequence, a new count value is obtained when the (n+1)th cycle
Xn+1, Xn+1It will be added to the arrival end of rolling parameters sequence, whole sequence is to right translation (i.e. first in first out), Xn-mFrom sequence
Remove, the like realize roll.Wherein, m groups sequence is that phonic wheel processing is missed during suppressing rotor even running as inertia
The fluctuation of speed caused by poor, effectively increases measurement accuracy.
Real-time counting value is the count value that current period is obtained, and is placed on the arrival end of rolling parameters sequence, is counted with rolling
It is for the quickening response in dynamic process, that is, dynamic process that value, which compares, (when instantaneous value and larger rolling average value difference)
Selection real-time counting value is to ensure that it is followed to the quick of rotating speed, and steady-state process (difference is little) selection roll count value.
Count value from big to small will be corresponding to digital quantity 0~2000, so to carry out division arithmetic, but FPGA is hardware electricity
Road can not directly carry out division arithmetic, it is necessary to be obtained by multiple subtraction.Dividend is unrestricted choice, can be passed through
Regulation dividend meets the measurement scheme of different phonic wheels and the range of speeds, so the versatility of this module is also very strong；Divisor is
For count value.
It is preferred that, the FPGA digital circuit is included with lower module：
(a) time-delay reset module：The 100ms that is delayed after electrifying startup sends reset signal to lower module, wait FPGA from
Load after program and resetted again in FLASH, it is ensured that each dwell vessel original state is reliable and stable；
(b) watchdog module：Clock signal is counted by house dog counter, counted when rising edge clock arrives
Numerical value adds 1；If count value exceedes threshold value, count value is locked, and by threshold value mark position 1, otherwise rising edge clock is held
It is continuous to count；When square-wave signal rising edge arrives, house dog counter clear 0, and by threshold value mark position 0；When threshold value flag bit
For 0 when, into the divide portion of state machine module；If threshold value flag bit is 1, does not enter divide portion and be directly entered state
The conversion portion of machine module and condition adjudgement part；
(c) counting module：Square-wave signal is counted under clock pulses by frequency counter, and by recent renewal
M count cycle count value Xn-m, Xn-m+1... XnRolling is stored in m roll counter；By in m roll counter
Count value is added, divided by m obtains rolling average valueAnd be saved in register A, into the assignment section of state machine module；
(d) state machine module：Including assignment section, divide portion, conversion portion and condition adjudgement part；Wherein, assignment
Part is used to read the rolling average value in register AAnd average value is rolled to gainedWith real-time counting value XnIt is compared,
If both deviations are more than real-time counting value Xn1/64, then choose real-time counting value XnThe divisor X of divide portion is assigned to,
Otherwise roll count value is selectedThe divisor X of divide portion is assigned to, while to the dividend A assignment of divide portion；Divide portion
For realizing that the division logic in formula (a) is calculated, so that the digital quantity Q corresponding to count value X is obtained, and conversion portion passes through
Gained data signal is sent to current output circuit by SPI communication；Condition adjudgement part is according to count value X size to working as forward
Sub- state is judged and exports corresponding low and high level signal to give excess revolutions protection circuit.
Wherein, watchdog module is primarily used to detection either with or without square-wave signal entrance, does not such as access sensor or biography
Sensor breaks down, and now watchdog module will work always, points out no square-wave signal input；Rising edge clock is FPGA
The clock signal that external crystal-controlled oscillation is produced, such as uses 1MHz crystal oscillators, rising edge is exactly that 1ns occurs once, as FPGA internal clocking,
And square-wave signal is signal conditioning circuit generation；Time-delay reset module is only performed once after the power-up, and watchdog module is independent
In counting module and state machine module；Counting module uses parallel organization with state machine module, and counting is being carried out always, and will be every
Secondary count results are deposited in a register；State machine module first takes out count results before division assignment is carried out from register, then
Subsequently calculated.
It is preferred that, the current output circuit includes D/A (D/A switch) devices and V/I (voltages/electricity being sequentially connected
Stream) device, wherein, D/A devices are used to receive the rotating speed digital quantity of FPGA digital circuit output and are converted into mould
Intend voltage, the analog voltage amount that V/I devices are used to export D/A devices is converted to the output of 4~20mA electric currents.
Beneficial effect：A kind of high reliability rotating speed transducer module that the present invention is provided, relative to prior art, with
Lower advantage：1st, designed using pure hardware circuit, run without program out of control fly, Problem of Failure, effectively increase tachometric survey can
By property；2nd, realize that rotating speed is gathered by PLD, and by D/A and V/I devices conversion 4~20mA of output electric current letters
Number, its Process Precision is high, response is fast；3rd, tachometric survey is realized using improvement cycle test method, effectively reduces counting error and pulse
Measurement fluctuation caused by the mismachining tolerance of generator.
Brief description of the drawings
Fig. 1 is a kind of flow chart of high reliability rotating speed transducer module of the invention；
Fig. 2 is the circuit diagram of signal conditioning circuit in a kind of high reliability rotating speed transducer module of the invention；
Fig. 3 is the program flow diagram of FPGA digital circuits in a kind of high reliability rotating speed transducer module of the invention；
Fig. 4 is the flow chart of current output circuit in a kind of high reliability rotating speed transducer module of the invention；
Figure includes：1st, power-supplying circuit, 2, signal conditioning circuit, 3, FPGA (FPGA) digital circuit, 4,
Current output circuit, 5, excess revolutions protection circuit, 6, speed probe, 2-1, coupled capacitor, 2-2, filter circuit, 2-3, clamper two
Pole pipe, 2-4, difference amplifier, 2-5, hysteresis comparator, 2-6, transistor.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is further described to the present invention.
It is a kind of high reliability rotating speed transducer module as shown in Figure 1, including：
Power-supplying circuit 1, including two DC-DC insulating power supply circuits, by 24V dc sources be respectively converted into ± 5V and
15V voltage outputs and realize power supply；Wherein ,+5V voltages are supplied to analog device to use after isolating using inductance, and+15V is used for V/
I devices are powered；+ 5V voltages supply FPGA and other respectively through 1.2V and 3.3V voltages are converted to after two linear voltage regulators
Circuit is used；- 5V voltages provide the reverse power supply voltage of amplifier and comparator.
Signal conditioning circuit 2, the analog pulse signal for speed probe 6 to be exported is nursed one's health into square-wave signal and exported
To FPGA digital circuit 3；
FPGA digital circuit 3, for gathering the frequency information of square-wave signal and being converted into corresponding numeral
Signal, is exported to current output circuit 4, while output switch amount signal is low and high level signal to excess revolutions protection circuit 5；
Current output circuit 4, the current signal for the data signal of input to be converted to 4~20mA is exported；
Excess revolutions protection circuit 5, driven according to the on-off model controlling switch triode of input the actuating of relay there is provided
4 roads Control contact, for shutting down, lighting a fire, the output of specified, excess revolutions status switch amount, and indicate by LED to open
Off status.
As shown in Fig. 2 the signal conditioning circuit 2 includes the coupled capacitor 2-1, filter circuit 2-2, clamper being sequentially communicated
Diode 2-3, difference amplifier 2-4, hysteresis comparator 2-5 and transistor 2-6；Specifically circuit flow is：
The simulation tach signal that speed probe 6 is exported first passes through coupled capacitor 2-1 and removes DC component, then after filtering
Circuit 2-2 removes High-frequency Interference, then passes through clamp diode 2-3 clamping action and is amplified by difference amplifier 2-4, most
Afterwards by hysteresis comparator 2-5 more afterwards through transistor 2-6 level conversions, export 0~3.3V standard block signal to
FPGA digital circuit 3.
In the present embodiment, the speed probe can use magnetoelectric tachometric transducer or hall-effect speed sensor, and
Signal conditioning circuit is by switching the sensor type that selection is connected into.
In the present embodiment, the FPGA digital circuit 3 is using based on the improved cycle test method collection side of principle of inertia
The frequency information of ripple signal is simultaneously converted into corresponding data signal, and the improvement cycle test method comprises the following steps：
Step A：The square-wave signal that signal conditioning circuit 2 is inputted is divided, divided signal is then measured and each counts
The number of internal standard pulse one number time, i.e. count value X1, X2... Xn；
Step B：Using tolling measurement mode, that is, choose recent renewal 16 count cycle count value Xn-16, Xn-15...
XnAs rolling parameters sequence, and ask its average value, i.e. roll count value
Step C：To currently real-time count value XnWith roll count valueIt is compared, if both deviations are more than in fact
When count value Xn1/64, then choose real-time counting value XnNext step calculating is carried out as count value X, otherwise selection, which is rolled, counts
Value
Step D：The count value X by obtained by is calculated as the division logic in formula (a) and is converted to corresponding digital quantity Q, and
Exported by SPI communication to current output circuit 4；Formula (a) is：
Wherein, dividend A is setting value.
As shown in figure 3, the FPGA digital circuit 3 is included with lower module：
(a) time-delay reset module：The 100ms that is delayed after electrifying startup sends reset signal to module b, c, d, it is ensured that each deposit
Device original state is reliable and stable；
(b) watchdog module：1MHz clock signal is counted by house dog counter, when rising edge clock is arrived
Count value adds 1 when coming；If count value exceedes threshold value, count value is locked, and by threshold value mark position 1, otherwise on clock
Rise along keeping count；When square-wave signal rising edge arrives, house dog counter clear 0, and by threshold value mark position 0；Work as threshold value
When flag bit is 0, into the divide portion of state machine module；If threshold value flag bit is 1, does not enter divide portion and directly enter
Enter conversion portion and the condition adjudgement part of state machine module, point out no square-wave signal to enter；
(c) counting module：Square-wave signal is counted under 1MHz clock pulses by four frequency counters, and will
16 of recent renewal count cycle count value Xn-16, Xn-15... XnRolling is stored in 16 roll counters；By 16 rollings
Count value in dynamic counter is added, divided by 16 obtain rolling average valueAnd be saved in register A, into state machine module
Assignment section；
(d) state machine module：Including assignment section, divide portion, conversion portion and condition adjudgement part；Wherein, assignment
Part is used to read the rolling average value in register AAnd average value is rolled to gainedWith real-time counting value XnIt is compared,
If both deviations are more than real-time counting value Xn1/64, then choose real-time counting value XnThe divisor X of divide portion is assigned to,
Otherwise roll count value is selectedThe divisor X of divide portion is assigned to, while to the dividend A assignment of divide portion；Divide portion
Realize that the division logic in formula (a) is calculated by add operation, obtain the digital quantity Q corresponding to count value X, and conversion portion
12 position digital signals are sent to by current output circuit 4 by SPI communication；Condition adjudgement part is according to count value X size pair
Current rotor state is judged and exports corresponding low and high level signal to excess revolutions protection circuit 5.
As shown in figure 4, the current output circuit 4 include D/A (D/A switch) the device DAC7611 that are sequentially connected and
V/I (voltage/current conversion) device AD694；Wherein, D/A devices are used for the numeral for receiving the output of FPGA digital circuit 3
Signal is simultaneously converted into analog voltage amount, and V/I devices be used for the analog voltage amount that exports D/A devices be converted to 4~
20mA electric currents are exported.
By taking FPGA-A types as an example, Type B and c-type are substantially similar in mentality of designing, and setting range is as follows：
(1) 0~900r/min of the range of speeds, 47 teeth, frequency range is 0~705Hz；
(2) using cycle test method collection speed-frequency signal is improved, 12 bit digital quantity signals are exported；
(3) 4 road Control contacts are provided, for shutting down, lighting a fire, the output of specified, excess revolutions status switch amount；
(4) independent house dog logic, stopped status is indicated when being accessed without tach signal.
By taking A type tachometric surveies as an example, 0~900r/min of the range of speeds, 47 teeth, frequency range is 0~705Hz, but is worked as
When frequency tends to 0, the count value of cycle test method will tend to be infinitely great, therefore remove part low-frequency range, frequency range 0.5Hz~
Frequency is between 0.125Hz~176.25Hz after 705Hz, four frequency dividings.Selected external clock is 1MHz, to four divided signals
A cycle counted, so input signal be 0.5Hz when, count value is 8000000, count value be more than 8000000 when
It is 0 then to think frequency；During input signal 705Hz, count value is 5674, when count value is less than 5674, then it is assumed that frequency is
705Hz。
By the V/I converters used export 20mA when voltage is 2V, in order that D/A converter is in input signal
2V voltages are exported during 705Hz it is necessary to which count value 5674 is converted into digital quantity 2000,5674*2000=11347517 is taken for this
As dividend, with the number divided by count value, the corresponding business of such 0Hz~705Hz is 0~2000.
As shown in table 1, the corresponding count value of some key frequency points of A pattern blocks and 12 bit digital quantities of output are given
Business (with decimal representation).
The corresponding count value of the FPGA-A type key frequency points of table 1
| Rotating speed (rpm) | Frequency (Hz) | Count value | Business |
| 0.638 | 0.5 | 8000000 | 1 |
| 3 | 2.35 | 1702128 | 6 |
| 5 | 3.92 | 1020408 | 11 |
| 92 | 72.07 | 55502 | 204 |
| 100 | 78.33 | 51066 | 222 |
| 702 | 549.9 | 7274 | 1560 |
| 710 | 556.17 | 7192 | 1577 |
| 840 | 658 | 6079 | 1866 |
| 848 | 664.27 | 6022 | 1884 |
| 900 | 705 | 5674 | 2000 |
Here dividend A is provided, by measured frequency f, the corresponding calculated relationship between business Q, by measured frequency f by four frequency dividings
Afterwards, the calibration pulse for being 1MHz with frequency carries out cycle test method counting, and its count value X is：
As can be seen that count value is reflected by the size of measured frequency, the more big then frequency of count value is lower.
Substitute into according to formula (a), can obtain：
By above formula, the application scenario of different rotating speeds measurement range is directed to, the dividend that can change division logic comes
Realize versatility, such as two kinds of models of B, C：
(1) 0~40000r/min of the Type B range of speeds, 2 teeth, frequency range is 0~1333.33Hz, exports 4~20mA, is
Make D/A converter when input signal is 1333.33Hz output 2V voltages it is necessary to count value 3000 is converted into digital quantity
2000,3000*2000=6000000 is taken for this as dividend, with the number divided by count value；
(2) 0~2000r/min of the c-type range of speeds, 182 teeth, frequency range is 0~6.067KHz, exports 4~20mA, is
Make D/A converter when input signal is 6.067Hz output 2V voltages it is necessary to count value 659 is converted into digital quantity 2000,
659*2000=1318000 is taken for this as dividend, with the number divided by count value.
Table 2 gives the pass of the corresponding count value of maximum of three types rotating speed transducer module measurement rotating speed
System.
The A of table 2, B, c-type highest output speed
| Type | Rotating speed (rpm) | Frequency (Hz) | Dividend | Count value | Business |
| A | 900 | 705 | 11347517 | 5674 | 2000 |
| B | 40000 | 1333.33 | 6000000 | 3000 | 2000 |
| C | 2000 | 6067 | 1318000 | 659 | 2000 |
The electronic component normal working temperature scope that the present invention is used has carried out three proofings protection for -40 DEG C~80 DEG C, warp
Test can reliably work under the rugged environments such as high/low temperature, humidity.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of high reliability rotating speed transducer module, it is characterised in that including：
Power-supplying circuit (1), including two DC-DC insulating power supply circuits, by 24V dc sources be respectively converted into ± 5V and
15V voltage outputs and realize power supply；
Signal conditioning circuit (2), for the analog signal conditioner that exports speed probe (6) to be into square-wave signal and exports to can
Programmed logic digital circuit (3)；
FPGA digital circuit (3), for gathering the frequency information of square-wave signal and being converted into corresponding numeral letter
Number, export and give current output circuit (4), while output switch amount signal gives excess revolutions protection circuit (5)；
Current output circuit (4), the current signal for the data signal of input to be converted to 4~20mA is exported；
Excess revolutions protection circuit (5), drives the actuating of relay, and indicate protection shape by luminous tube according to the on-off model of input
State.
2. a kind of high reliability rotating speed transducer module according to claim 1, it is characterised in that the signal condition electricity
Road (2) includes the coupled capacitor (2-1) being sequentially connected, filter circuit (2-2), clamp diode (2-3), difference amplifier (2-
4), hysteresis comparator (2-5) and transistor (2-6).
3. a kind of high reliability rotating speed transducer module according to claim 1, it is characterised in that the speed probe
(6) magnetoelectric tachometric transducer or hall-effect speed sensor are used.
4. a kind of high reliability rotating speed transducer module according to claim 1, it is characterised in that the FPGA
It is low and high level signal that digital circuit (3), which is exported to the on-off model of excess revolutions protection circuit (5),.
5. a kind of high reliability rotating speed transducer module according to claim 1, it is characterised in that the FPGA
Digital circuit (3) is using the frequency information for improving cycle test method collection square-wave signal and is converted into corresponding data signal, and
The improvement cycle test method comprises the following steps：
Step A：The square-wave signal that signal conditioning circuit (2) is inputted is divided, divided signal is then measured and each counts
The number of cycle internal standard pulse, i.e. count value X1, X2... Xn；
Step B：Choose recent renewal m counts cycle count value Xn-m, Xn-m+1... XnAs rolling parameters sequence, and ask it
Average value, i.e. roll count value
Step C：To currently real-time count value XnWith roll count valueIt is compared, if both deviations are more than real-time counting
Value Xn1/64, then choose real-time counting value XnNext step calculating is carried out as count value X, roll count value is otherwise selected
Step D：The count value X by obtained by is calculated as the division logic in formula (a) and is converted to corresponding digital quantity Q, and is passed through
SPI communication, which is exported, gives current output circuit (4)；Formula (a) is：
Wherein, dividend A is setting value.
6. a kind of high reliability rotating speed transducer module according to claim 5, it is characterised in that the FPGA
Digital circuit (3) is included with lower module：
(a) time-delay reset module：The 100ms that is delayed after electrifying startup sends reset signal to lower module；
(b) watchdog module：Clock signal is counted by house dog counter, the count value when rising edge clock arrives
Plus 1；If count value exceedes threshold value, count value is locked, and by threshold value mark position 1, otherwise rising edge clock is persistently counted
Number；When square-wave signal rising edge arrives, house dog counter clear 0, and by threshold value mark position 0；When threshold value flag bit is 0
When, into the divide portion of state machine module；If threshold value flag bit is 1, does not enter divide portion and be directly entered state machine
The conversion portion of module and condition adjudgement part；
(c) counting module：Square-wave signal is counted under clock pulses by frequency counter, and by the m of recent renewal
Individual counting cycle count value Xn-m, Xn-m+1... XnRolling is stored in m roll counter；By the meter in m roll counter
Numerical value is added, divided by m obtains rolling average valueAnd be saved in register A, into the assignment section of state machine module；
(d) state machine module：Including assignment section, divide portion, conversion portion and condition adjudgement part；Wherein, assignment section
For reading the rolling average value in register AAnd average value is rolled to gainedWith real-time counting value XnIt is compared, if two
The deviation of person is more than real-time counting value Xn1/64, then choose real-time counting value XnThe divisor X of divide portion is assigned to, otherwise
Select roll count valueThe divisor X of divide portion is assigned to, while to the dividend A assignment of divide portion；Divide portion is used for
Realize that the division logic in formula (a) is calculated, obtain the digital quantity Q corresponding to count value X, and conversion portion passes through SPI communication
Gained data signal is sent to current output circuit (4)；Condition adjudgement part is according to count value X size to current rotor shape
State is judged and exports corresponding on-off model to give excess revolutions protection circuit (5).
7. a kind of high reliability rotating speed transducer module according to claim 1, it is characterised in that the electric current output electricity
Road (4) includes the D/A devices and V/I devices being sequentially connected；Wherein, D/A devices are used to receive FPGA digital circuit (3)
The data signal of output is simultaneously converted into analog voltage amount, and the analog voltage amount that V/I devices are used to export D/A devices turns
It is changed to the output of 4~20mA electric currents.
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| CN107765100A (en) * | 2017-10-19 | 2018-03-06 | 山东大学 | A kind of waveform signal prejudges period Analysis |
| CN108152524A (en) * | 2017-12-22 | 2018-06-12 | 辽宁奇辉电子系统工程有限公司 | A kind of Hall wheel detector and its method of work |
| CN110068698A (en) * | 2019-04-12 | 2019-07-30 | 西安爱生技术集团公司 | A kind of unmanned plane piston engine revolving speed Acquisition Circuit |
| CN111610342A (en) * | 2020-06-09 | 2020-09-01 | 杭州澎康自动化科技有限公司 | Rotating machinery frequency measuring method and conversion device |
| CN114020070A (en) * | 2021-10-15 | 2022-02-08 | 北京航天控制仪器研究所 | Temperature control system for compatible two-type inertial platform |
| CN114660322A (en) * | 2022-03-18 | 2022-06-24 | 陕西工业职业技术学院 | Instantaneous rotating speed fluctuation monitoring device of hydraulic system and fluctuation information acquisition method |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
| CN117129705A (en) * | 2023-10-25 | 2023-11-28 | 成都维客昕微电子有限公司 | Motor rotating speed detection system and method based on working current |
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| CN107729980A (en) * | 2017-10-19 | 2018-02-23 | 中南大学 | A kind of waveform signal adaptometer counting method |
| CN107765100A (en) * | 2017-10-19 | 2018-03-06 | 山东大学 | A kind of waveform signal prejudges period Analysis |
| CN107765100B (en) * | 2017-10-19 | 2020-08-18 | 山东大学 | Waveform signal pre-judging period analysis method |
| CN108152524A (en) * | 2017-12-22 | 2018-06-12 | 辽宁奇辉电子系统工程有限公司 | A kind of Hall wheel detector and its method of work |
| CN110068698A (en) * | 2019-04-12 | 2019-07-30 | 西安爱生技术集团公司 | A kind of unmanned plane piston engine revolving speed Acquisition Circuit |
| CN111610342A (en) * | 2020-06-09 | 2020-09-01 | 杭州澎康自动化科技有限公司 | Rotating machinery frequency measuring method and conversion device |
| CN114020070A (en) * | 2021-10-15 | 2022-02-08 | 北京航天控制仪器研究所 | Temperature control system for compatible two-type inertial platform |
| CN114020070B (en) * | 2021-10-15 | 2023-03-31 | 北京航天控制仪器研究所 | Temperature control system for compatible two-type inertial platform |
| CN114660322A (en) * | 2022-03-18 | 2022-06-24 | 陕西工业职业技术学院 | Instantaneous rotating speed fluctuation monitoring device of hydraulic system and fluctuation information acquisition method |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
| CN117129705A (en) * | 2023-10-25 | 2023-11-28 | 成都维客昕微电子有限公司 | Motor rotating speed detection system and method based on working current |
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Application publication date: 20171003 |