CN109194205A - A kind of HALL input signal conditioning circuit - Google Patents
A kind of HALL input signal conditioning circuit Download PDFInfo
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- CN109194205A CN109194205A CN201810827762.7A CN201810827762A CN109194205A CN 109194205 A CN109194205 A CN 109194205A CN 201810827762 A CN201810827762 A CN 201810827762A CN 109194205 A CN109194205 A CN 109194205A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
Abstract
A kind of HALL input signal conditioning circuit of the present invention controls hardware electronic technology for brshless DC motor, belongs to digital signal processing circuit application field.The present invention causes the problem of HALL signal identification mistake for signal fluctuation, level unstability, burr interference etc. occur in HALL signal processing circuit, carry out the optimization design of circuit level, circuit after optimization, so that conditioning of the waveform of HALL input signal Jing Guo multiple links, it is ultimately converted to the low and high level signal that digital device can be identified clearly, has effectively evaded the phenomenon for leading to identification mistake in HALL signals transmission because of interference.
Description
Technical field
A kind of HALL input signal conditioning circuit of the present invention, belongs to digital signal processing circuit application field.
Background technique
It is inputted using HALL sensor as motor position signal for many brshless DC motor SERVO CONTROL projects
Technical background, in real work because the problems such as HALL signal fluctuation, level unstability, burr interference, control circuit is easy to appear
To the identification mistake of HALL signal low and high level, thus work is caused to interfere motor control.Therefore needing one kind can evade
Interference is realized to the reliable circuit of HALL input signal conditioning.A kind of HALL input signal conditioning circuit of the present invention, by right
HALL input signal carries out the work such as capacitance-resistance filter, one-way conduction, stagnant ring compare, phase inverter buffers, so that HALL input signal
It is optimised conditioning, is converted to the digital signal level that can be clearly identified, improves and is inputted based on HALL sensor feedback
Electromotor servo control circuit work reliability.
Summary of the invention
The purpose of the present invention: signal occurs for the present invention because of voltage fluctuation, level to the HALL signal in servo control circuit
Unstability, burr interference etc. cause the problem of HALL signal identification mistake, a kind of HALL input signal conditioning circuit are proposed, to HALL
Input signal optimizes solution, the circuit after optimization change, so that tune of the waveform of HALL input signal Jing Guo multiple links
Reason, be ultimately converted to the low and high level signal that digital device can be identified clearly, effectively evaded in HALL signals transmission because
Interfere and cause the phenomenon of identification mistake.
Technical solution of the present invention:
A kind of HALL input signal conditioning circuit of the present invention, which is characterized in that the circuit includes entrance pull-up circuit, one
Rank filter circuit, one-way conduction circuit, stagnant ring comparison circuit, reversed buffer circuit；
Entrance pull-up circuit: its function is the DC analogue quantity signal for inputting HALL sensor 1, by resistance 1 into
Signal one is obtained after the processing of row pull-up, one numerical value of signal is V1, wherein one 2 one end of resistance connects DC simulation power positive end, directly
Flow field simulation power supply numerical value is VAA；
First-order filtering circuit: its function is to obtain signal two, two numerical value of signal after carrying out first-order filtering processing to signal one
For V2；
One-way conduction circuit: its function is to realize to obtain letter to after the progress one-way conduction processing of signal two using diode 5
Numbers three, three numerical value of signal is V3, and the effect of one-way conduction circuit is to prevent negative interference pulse from entering circuit；
Stagnant ring comparison circuit: its function be signal three is compared with reference voltage by operational amplifier 6, and than
The stagnant ring window of voltage threshold is formed during relatively, wherein signal three is inputted from the in-phase end of operational amplifier 6, reference voltage
It is inputted from the backward end of operational amplifier 6, reference voltage is signal four, numerical value V4, when the in-phase end of operational amplifier 6 is defeated
When entering backward end input signal of the signal greater than operational amplifier 6,6 output end signal of operational amplifier is "ON" signal；Conversely,
When the backward end of the in-phase end input signal less-than operation amplifier 6 of operational amplifier 6 inputs wire size, operational amplifier 6
Output end is " ground " signal, after signal three is compared by operational amplifier 6 with reference voltage, from the output of operational amplifier 6
The signal of end output "/open " characteristic, the signal obtain the signal five that numerical value is V5 after pulling up by resistance 6 10, wherein electricity
It hinders 6 10 one end and connects digital power positive end, digital power numerical value is VCC；
Reversed buffer circuit: its function is to increase the steepness of signal after signal five to be sent into the reversed buffer circuit of two-stage, instead
Signal five is converted to the signal six for the discrete magnitude form that digital circuit can accurately identify to buffer circuit, six numerical value of signal is
V6, signal six are signal after a kind of HALL of HALL input signal conditioning circuit final output of the present invention is improved.
The entrance pull-up circuit, including resistance 1, one end of output end " OUT " and resistance 1 of HALL sensor 1
Connection, DC simulation power positive end are connect with the other end of resistance 1.
The first-order filtering circuit, including resistance 23, capacitor 4, one end of resistance 23 and the output end of HALL sensor 1
" OUT " is connected, and the other end of resistance 23 is connected with one end of capacitor 4, which is the output end of first-order filtering circuit,
Output signal is signal two, and two numerical value of signal is V2, and the other end of capacitor 4 is connected with simulation ground AGND.
The anode of the one-way conduction circuit, including diode 5, diode 5 is connected with the output end of first-order filtering circuit,
The cathode of diode 5 is the output end of one-way conduction circuit, and output signal three, three numerical value of signal is V3.
The stagnant ring comparison circuit, including operational amplifier 6, resistance 37, resistance 48, resistance 59, operational amplifier 6
In-phase end be connected with the output end of one-way conduction circuit, while one end phase of the in-phase end of operational amplifier 6 and resistance 37
Even, the output end of operational amplifier 6 is connected with the other end of resistance 37, while the output end of operational amplifier 6 and resistance 6 10
One end be connected, the other end of resistance 6 10 is connected with digital power anode, the reverse side of operational amplifier 6 and resistance 48
One end is connected, and the other end of resistance 48 is connected with the anode of DC simulation power supply, while the reverse side of operational amplifier 6 and electricity
It hinders 59 one end to be connected, with simulation AGND is connected for the other end of resistance 59, and the reverse side of operational amplifier 6 is obtained by resistance
48, the reference voltage that the partial pressure of resistance 59 generates is signal four, numerical value V4.
The reversed buffer circuit, including phase inverter 1, phase inverter 2 12, the input terminal of phase inverter 1 and stagnant ring ratio
Output end compared with circuit is connected, and the output signal that the output end of stagnant ring comparison circuit obtains is exactly signal five, phase inverter 1
Output end is connected with the input terminal of phase inverter 2 12, and output end, that is, reversed buffer circuit output end of phase inverter 2 12, this is defeated
Outlet output signal six, six numerical value of signal are V6.
The stagnant ring comparison circuit, which is characterized in that when one-way conduction circuit output signal three voltage from low to high
When variation, the voltage threshold of stagnant ring comparison circuit is point of accumulation voltage threshold of visiting, when signal three rises above point of accumulation electricity of visiting
When pressing threshold value, the voltage of the output signal V5 of stagnant ring comparison circuit is high level；When the output signal three of one-way conduction circuit
When voltage changes from high to low, the voltage threshold of stagnant ring comparison circuit is Xiamen point of accumulation voltage threshold, when signal three drop to it is small
When the point of accumulation voltage threshold of Xiamen, the voltage of the output signal V5 of stagnant ring comparison circuit is low level；Therefore, one-way conduction circuit
Output signal in the conversion process of stagnant ring comparison circuit, there are two trip points and visit point of accumulation voltage threshold and Lower Threshold
Point voltage threshold, the difference of two trip point voltage thresholds is hysteresis voltage or stagnant ring window；The resistance value of resistance 48, resistance 59
Identical, resistance 48, the model of resistance 59 are consistent, the numerical value V4 of reference voltage signal four, are DC simulation supply voltage numerical value
The half of VAA.
The reversed buffer circuit, which is characterized in that phase inverter 1, the model of phase inverter 2 12 are consistent, reversed slow
Rush circuit input signal and output signal after two-stage reverse process voltage levels level be consistent.
The present invention has the advantage that and the utility model has the advantages that the present invention improves HALL signal in servo control circuit,
So that the interference effect that HALL input signal is subject to has obtained timely abatement.The present invention is excellent to the circuit of HALL input signal conditioning
Change scheme simple possible, required main components are a piece of operational amplifier, two panels reverser, a capacitor, a diode
And six resistance, it is low to manufacturing technique requirent in terms of productivity, it is convenient to carry out in actual operation in terms of maintainability.According to this
The HALL input signal conditioning circuit for inventing design, has effectively cut down unfavorable interference, the HALL sensor after oversampling circuit improves
Input signal is converted to the digital level discrete magnitude signal that stabilization can be identified clearly, can be directly entered the progress of processor pin
Capture is read, and the reliability of the servo closed control circuit work based on HALL sensor is improved.
Detailed description of the invention
Fig. 1 is HALL input signal conditioning circuit theory schematic diagram；
Wherein, 1 is HALL sensor, and 2 be resistance one, and 3 be resistance two, and 4 be capacitor, and 5 be diode, and 6 be operation amplifier
Device, 7 be resistance three, and 8 be resistance four, and 9 be resistance five, and 10 be resistance six, and 11 be phase inverter one, and 12 be phase inverter two.
Specific embodiment
The principle of the present invention:
A kind of HALL input signal conditioning circuit of the present invention, working principle be, to the input signal of HALL sensor,
Inlet is pulled up, and is determined the voltage value of HALL sensor input signal "ON" turntable, is then carried out first-order filtering, filter out
High frequency impurity signal existing for HALL input signal prevents negative sense disturbing pulse from entering rear class electricity using one-way conduction circuit
Then road obtains state clearly low and high level digital signal by stagnant ring comparison circuit, finally passes through reversed buffer circuit pair
Signal carries out steepness optimization, thus to obtain the HALL signal by conditioning.
The present invention is described in more detail in following combination attached drawing.
A kind of HALL input signal conditioning circuit of the present invention, which is characterized in that the circuit includes entrance pull-up circuit, one
Rank filter circuit, one-way conduction circuit, stagnant ring comparison circuit, reversed buffer circuit；
Entrance pull-up circuit: its function is the DC analogue quantity signal for inputting HALL sensor (1), passes through resistance 1
Signal one being obtained after carrying out pull-up processing, one numerical value of signal is V1, wherein one 2 one end of resistance connects DC simulation power positive end,
DC simulation power supply numerical value is VAA；
The selection of one 2 model of resistance is according to the handbook of HALL sensor component, and recommendation selects resistance value for the resistance of 2K,
To improve anti-interference, pull-up processing is carried out to HALL input signal with 15V DC simulation power supply or 5V DC simulation power supply.Choosing
After determining DC simulation supply voltage grade, the rated power for paying particular attention to resistance 1 has to be larger than corresponding resistance calculations
Power consumption therefore ensures that resistance 1 can work normally under febrile state, and resistor power calculation formula is as follows:
P=VA 2/R (1)
In formula (1), P is resistor power, VAFor DC simulation supply voltage value, R is resistance；
First-order filtering circuit: its function is to obtain signal two, two numerical value of signal after carrying out first-order filtering processing to signal one
For V2, due to HALL input signal is "/open " signal, when HALL input signal is "On" state, time constant filter meter
It is as follows to calculate formula:
T=(R1+R2) * C (2)
When HALL signal is " ground ", time constant filter calculation formula is as follows:
T=R2*C (3)
In formula (2), formula (3), T is first-order filtering time constant, and R1 is resistance one described in entrance pull-up circuit
2, R2 be resistance 23 described in first-order filtering circuit, and C is capacitor 4 described in first-order filtering circuit, and time constant filter
The calculation formula for being converted to filter cutoff frequency is as follows:
F=1/ (2*PI*T) (4)
In formula (4), F is first-order filtering cutoff frequency, and PI is pi, and T is first-order filtering time constant, according to tradition
The cutoff frequency of the requirement of circuit filtering parameter designing, the first-order filtering circuit should input the 10 of frequency at least more than HALL maximum
Times, and the calculation formula of HALL input frequency is as follows:
F=n*p/60 (5)
In formula (5), f is that HALL inputs frequency, and n is empty load of motor revolving speed, and p is the extremely right of HALL sensor in motor
Number；
One-way conduction circuit: its function is to realize to obtain letter to after the progress one-way conduction processing of signal two using diode 5
Numbers three, three numerical value of signal is V3, and the effect of one-way conduction circuit is to prevent negative interference pulse from entering circuit, is chosen common
G1N4148 fast switching diodes are preventing negative sense disturbing pulse from entering the same of the stagnant ring comparison circuit of rear class as diode 5
When, play the role of switching and rectifying, protect operational amplifier 6 in stagnant ring comparison circuit；
Stagnant ring comparison circuit: its function be by operational amplifier 6 to signal three carry out compared with reference voltage, and than
The stagnant ring window of voltage threshold is formed during relatively, wherein resistance 48 and resistance 59 generate reference voltage letter after dividing VAA
Numbers four, four numerical value of signal is V4, and operational amplifier 6 is according to the output of the comparison result of signal three and signal four "/open " characteristic
Signal, and signal five is obtained after the signal is carried out pull-up processing by resistance 6 10, five numerical value of signal is V5, wherein resistance six
10 one end connect digital power positive end, and digital power numerical value is VCC；Stagnant ring compares using 59 pairs of resistance 48, resistance direct current moulds
As the reference voltage, numerical value V4, resistance 48, the resistance value of resistance 59 are identical for the partial pressure of quasi- supply voltage, resistance 48, electricity
Hinder 59 model it is consistent, it is ensured that the numerical value V4 of reference voltage signal four is the half of DC simulation supply voltage numerical value VAA；
The stagnant ring comparison circuit, which is characterized in that when one-way conduction circuit output signal three voltage from low to high
When variation, the voltage threshold of stagnant ring comparison circuit is point of accumulation voltage threshold of visiting, when signal three rises above point of accumulation electricity of visiting
When pressing threshold value, the voltage of the output signal V5 of stagnant ring comparison circuit is high level；When the output signal three of one-way conduction circuit
When voltage changes from high to low, the voltage threshold of stagnant ring comparison circuit is Xiamen point of accumulation voltage threshold, when signal three drop to it is small
When the point of accumulation voltage threshold of Xiamen, the voltage of the output signal V5 of stagnant ring comparison circuit is low level；Therefore, one-way conduction circuit
Output signal in the conversion process of stagnant ring comparison circuit, there are two trip points and visit point of accumulation voltage threshold and Lower Threshold
Point voltage threshold, the difference of two trip point voltage thresholds is hysteresis voltage or stagnant ring window；
Point of accumulation of visiting voltage threshold calculation formula is as follows:
In formula (6), Vi(L→H)For the point of accumulation voltage of visiting of stagnant ring comparison loop, R2 is resistance 23, and R3 is resistance 37,
Vref is reference voltage signal four, VOLFor operational amplifier 6LM139 export low level when voltage value, room temperature maximum 0.4V, entirely
Warm range maximum 0.7V, Vd are the conduction voltage drop of diode 5G1N4148, it is believed that operational amplifier 6LM139 output voltage is low
When level, as " ground " signal inputs wire size when in-phase end input signal is greater than backward end for operational amplifier 6LM139
When, operational amplifier 6LM139 output is "ON", conversely, when in-phase end input signal is less than backward end input wire size, operation
Amplifier 6LM139 output is " ground "；
Xiamen point of accumulation voltage threshold calculation formula is as follows:
In formula (7), Vi(H→L)For the Xiamen point of accumulation voltage of stagnant ring comparison loop, R2 is resistance 23, and R3 is resistance 37,
Vref is reference voltage signal four, VCCFor the pull-up digital power electricity through resistance 6 10 of operational amplifier 6LM139 output end
Pressure is the conduction voltage drop of diode 5G1N4148 using 3.3V or 5V, Vd；
There is a parametric assumption herein, it is assumed that R3 > 10*R6, R3 are resistance 37, and R6 is resistance 6 10, so be can ensure that
The useful effect of digital power voltage is pulled up in operational amplifier 6LM139 output end, will not be led due to being divided by hysteresis comparison circuit
Cause pull-up level value insufficient,
By obtaining the stagnant ring window calculation formula of stagnant ring comparison circuit in formula (6), formula (7) are as follows:
In formula (8), Δ V is stagnant ring window, whether meets stagnant ring window from the point of view of the maximum and minimum value by calculating Δ V
Parameter request, general to require, the stagnant ring window of stagnant ring comparison circuit is not less than 0.6, is not more than 1.2V；
Reversed buffer circuit: its function is to increase the steepness of signal after signal five to be sent into the reversed buffer circuit of two-stage, instead
Signal five is converted to the signal six for the discrete magnitude form that digital circuit can accurately identify to buffer circuit, six numerical value of signal is
V6, signal six are signal after a kind of HALL of HALL input signal conditioning circuit final output of the present invention is improved；Described is anti-
To buffer circuit, which is characterized in that phase inverter 1, the model of phase inverter 2 12 are consistent, the input signal of reversed buffer circuit
With output signal after two-stage reverse process voltage levels level be consistent；At this time it is noted that 6 10 pull-up resistor of resistance
Selection, the resistance value of resistance 6 10 cannot be excessive, it is ensured that phase inverter 1, phase inverter 2 12 input terminal have enough electric currents defeated
Enter, it is proposed that the resistance value of resistance 6 10 chooses 4.7K.
Embodiment
A kind of HALL input signal conditioning circuit, which is characterized in that the circuit includes entrance pull-up circuit, first-order filtering
Circuit, one-way conduction circuit, stagnant ring comparison circuit, reversed buffer circuit；
Entrance pull-up circuit: its function is the DC analogue quantity signal for inputting HALL sensor 1, by resistance 1 into
Signal one is obtained after the processing of row pull-up, one numerical value of signal is V1, wherein one 2 one end of resistance connects DC simulation power positive end, directly
Flow field simulation power supply numerical value is VAA；
The selection of one 2 model of resistance is according to the handbook of HALL sensor component, and recommendation selects resistance value for the resistance of 2K,
To improve anti-interference, pull-up processing, i.e. VAA=+15V are carried out to HALL input signal with 15V DC simulation power supply.It is selected straight
After flow field simulation supply voltage grade, the rated power for paying particular attention to resistance 1 has to be larger than corresponding resistance calculations power consumption,
Therefore ensure that resistance 1 can work normally under febrile state, the selected resistance value of resistance 1 is the resistance of 2K Ω, according to formula
(1), resistor power P=V is calculatedA 2/ R=(15V)2/ 2K Ω=0.1125W considers margin of power and common resistor power
Application Range selects the resistance model RMK3216-1/4W-2Kohm-J of resistance 1；
First-order filtering circuit: its function is that signal one is obtained signal two after carrying out first-order filtering processing, numerical value is
V2, HALL input frequency calculation method are that revolving speed multiplies number of pole-pairs, such as steering engine Hall sensor maximum no-load speed n is
9000rpm, number of pole-pairs p are 2, then according to formula (5), calculate f=n*p/60=9000*2/60=300HZ, input is calculated
Frequency f is 300HZ, and according to design experiences, cutoff frequency is at least greater than 10 times of HALL signal frequency, is just unlikely to so that having
It is attenuated with signal, therefore selects 23 model RMK1608KB124FMB of resistance, i.e., resistance two (3) resistance value is 120K Ω, selection
Time constant filter T=R2*C is calculated according to formula (2) in 4 model GCT41L-0603-2C1-50V-330PF-K of capacitor
=120K*330P=39.6uS, and according to formula (4), calculate first-order filtering cutoff frequency F=1/ (2*PI*T)=1/ (2*
3.1415926*39.6uS)=4KHZ, it can be seen that 4KHZ > 10*f=3KHZ meets first-order filtering cutoff frequency and at least wants
Requirement of 10 times greater than HALL signal frequency；
One-way conduction circuit: its function is to realize to carry out one-way conduction processing, one-way conduction to signal two using diode 5
The effect of circuit is to prevent negative interference pulse from entering circuit, and signal two is converted to signal three after one-way conduction circuit is handled,
Its numerical value is V3, chooses common G1N4148 fast switching diodes as diode 5, enters preventing negative sense from bothering pulse
While rear class stagnant ring comparison circuit, play the role of switching and rectifying, operational amplifier 6 in the stagnant ring comparison circuit of protection；
Stagnant ring comparison circuit: its function be by operational amplifier 6 to signal three carry out compared with reference voltage, and than
The stagnant ring window of voltage threshold is formed during relatively, wherein reference voltage is signal four, numerical value V4, according to comparison result
The signal of output "/open " characteristic, and the "On" state of the signal is pulled to digital power voltage level by resistance 6 10, by
This obtains low and high level signal five, numerical value V5, using+15V DC simulation supply voltage, stagnant ring compare using resistance 48,
The partial pressure of 59 pairs of DC simulation supply voltages of resistance as the reference voltage, numerical value V4, it is proposed that resistance 48, resistance 59 select
It is selected as the resistance that model is consistent, resistance value is the same, so that reference voltage numerical value is the half of DC simulation supply voltage, uses 15V
Partial pressure is Vref=7.5V, considers that resistance precision and common resistor power Application Range, divider resistance resistance 48, resistance 59 select
With RMK1608YB103BMT, i.e., resistance 48, resistance 59 resistance value be 10K Ω, resistance 37 selects RMK1608KB914FMB,
I.e. the resistance value of resistance 37 is 910K Ω, when the voltage of the output signal three of one-way conduction circuit changes from low to high, stagnant ring ratio
Voltage threshold compared with circuit is point of accumulation voltage threshold of visiting, when signal three, which rises above, visits point of accumulation voltage threshold, stagnant ring
The voltage of the output signal V5 of comparison circuit is high level；When the voltage of the output signal three of one-way conduction circuit becomes from high to low
When change, the voltage threshold of stagnant ring comparison circuit is Xiamen point of accumulation voltage threshold, when signal three drops to less than Xiamen point of accumulation voltage
When threshold value, the voltage of the output signal V5 of stagnant ring comparison circuit is low level；Therefore, the output signal of one-way conduction circuit is stagnant
In the conversion process of ring comparison circuit, there are two trip points and visit point of accumulation voltage threshold and Xiamen point of accumulation voltage threshold, two
The difference of a trip point voltage threshold is hysteresis voltage or stagnant ring window；
There is a parametric assumption herein, it is assumed that R3 > 10*R6, R3 are resistance 37, and R6 is resistance 6 10, so be can ensure that
The useful effect of digital power voltage is pulled up in operational amplifier 6LM139 output end, will not be led due to being divided by hysteresis comparison circuit
Cause pull-up level value insufficient；
According to formula (8), the stagnant ring window delta V=0.607V of stagnant ring comparison circuit is calculated, meets stagnant ring window and is not less than
0.6V, the requirement no more than 1.2V；
Reversed buffer circuit: its function is that signal five is sent into the reversed buffer circuit of two-stage, increases the steepness of signal, will believe
Numbers five are converted to the digital signal level six that digital circuit can accurately identify, numerical value V6, and signal six is to have been converted into number
The HALL conditioned signal of word level, to make the rising and falling edges of rear class digital signal steeper, it is proposed that phase inverter 1, phase inverter
2 12 are buffered using 14 phase inverter of the two poles of the earth, it is proposed that and phase inverter 1, phase inverter 2 12 use SNJ54HCT14W chip, this
When it is noted that 6 10 pull-up resistor of resistance selection, the resistance value of resistance 6 10 cannot be excessive, it is ensured that phase inverter 1, phase inverter
2 12 input terminal has enough electric currents to input, it is proposed that the resistance value of resistance 6 10 chooses 4.7K, and the resistance value of resistance 37 is 910K
Ω meets the parametric assumption of R3 > 10*R6, and R3 is resistance 37, and R6 is resistance 6 10.
By the actual observation to reversed buffer circuit output end signal six, the HALL conditioned signal of output, which has been converted into, to be connect
The digital signal level of nearly standard block, a kind of HALL input signal conditioning circuit of the verifying present invention realize desired design mesh
Mark.
Claims (9)
1. a kind of HALL input signal conditioning circuit of the present invention, which is characterized in that the circuit includes entrance pull-up circuit, single order
Filter circuit, one-way conduction circuit, stagnant ring comparison circuit, reversed buffer circuit；
Entrance pull-up circuit: its function be by HALL sensor (1) input DC analogue quantity signal, by resistance one (2) into
Signal one being obtained after the processing of row pull-up, one numerical value of signal is V1, wherein resistance one (2) one end connects DC simulation power positive end,
DC simulation power supply numerical value is VAA；
First-order filtering circuit: its function is that signal two is obtained after carrying out first-order filtering processing to signal one, and two numerical value of signal is V2；
One-way conduction circuit: its function is to realize to obtain signal to after the progress one-way conduction processing of signal two using diode (5)
Three, three numerical value of signal is V3, and the effect of one-way conduction circuit is to prevent negative interference pulse from entering circuit；
Stagnant ring comparison circuit: its function is to be compared signal three with reference voltage by operational amplifier (6), and comparing
The stagnant ring window of voltage threshold is formed in the process, wherein signal three is inputted from the in-phase end of operational amplifier (6), reference voltage
It is inputted from the backward end of operational amplifier (6), reference voltage is signal four, numerical value V4, when the same phase of operational amplifier (6)
When input signal being held to be greater than the backward end input signal of operational amplifier (6), operational amplifier (6) output end signal is "ON" letter
Number；Conversely, when the backward end of the in-phase end input signal less-than operation amplifier (6) of operational amplifier (6) inputs wire size, fortune
The output end for calculating amplifier (6) is " ground " signal, after signal three is compared by operational amplifier (6) with reference voltage, from fortune
The signal of output end output "/open " characteristic of amplifier (6) is calculated, which obtains numerical value after pulling up by resistance six (10) and be
The signal five of V5, wherein resistance six (10) one end connects digital power positive end, and digital power numerical value is VCC；
Reversed buffer circuit: its function is to increase the steepness of signal after signal five to be sent into the reversed buffer circuit of two-stage, reversed slow
The signal six that signal five is converted to the discrete magnitude form that digital circuit can accurately identify by circuit is rushed, six numerical value of signal is V6, letter
Numbers six be a kind of HALL input signal conditioning circuit final outputs of the present invention HALL conditioning after signal.
2. a kind of HALL input signal conditioning circuit according to claim 1, which is characterized in that the entrance pull-up electricity
The output end " OUT " on road, including resistance one (2), HALL sensor (1) is connect with one end of resistance one (2), DC simulation power supply
Anode is connect with the other end of resistance one (2).
3. a kind of HALL input signal conditioning circuit according to claim 1, which is characterized in that the first-order filtering electricity
Road, including resistance two (3), capacitor (4), one end of resistance two (3) are connected with the output end " OUT " of HALL sensor (1), resistance
The other end of two (3) is connected with the one end of capacitor (4), which is the output end of first-order filtering circuit, and output signal is
For signal two, two numerical value of signal is V2, and the other end of capacitor (4) is connected with simulation ground AGND.
4. a kind of HALL input signal conditioning circuit according to claim 1, which is characterized in that the one-way conduction electricity
Road, including diode (5), the anode of diode (5) are connected with the output end of first-order filtering circuit, and the cathode of diode (5) is
The output end of one-way conduction circuit, output signal three, three numerical value of signal are V3.
5. a kind of HALL input signal conditioning circuit according to claim 1, which is characterized in that the stagnant ring is more electric
Road, including operational amplifier (6), resistance three (7), resistance four (8), resistance five (9), the in-phase end and list of operational amplifier (6)
It is connected to the output end of turning circuit, while the in-phase end of operational amplifier (6) is connected with one end of resistance three (7), operation is put
The output end of big device (6) is connected with the other end of resistance three (7), while the output end of operational amplifier (6) and resistance six (10)
One end be connected, the other end of resistance six (10) is connected with digital power anode, the reverse side of operational amplifier (6) and resistance four
(8) one end is connected, and the other end of resistance four (8) is connected with the anode of DC simulation power supply, while operational amplifier (6) is anti-
Phase end is connected with one end of resistance five (9), and the other end of resistance five (9) is connected with simulation ground AGND, operational amplifier (6) it is anti-
Phase end obtains by the reference voltage that resistance four (8), resistance five (9) partial pressure generate being signal four, numerical value V4.
6. a kind of HALL input signal conditioning circuit according to claim 1, which is characterized in that the reversed buffering electricity
Road, including phase inverter one (11), phase inverter two (12), the output end phase of the input terminal of phase inverter one (11) and stagnant ring comparison circuit
Even, the output signal that the output end of stagnant ring comparison circuit obtains is exactly signal five, the output end and phase inverter of phase inverter one (11)
The input terminal of two (12) is connected, output end, that is, reversed buffer circuit output end of phase inverter two (12), output end output letter
Numbers six, six numerical value of signal is V6.
7. a kind of HALL input signal conditioning circuit according to claim 5, which is characterized in that the stagnant ring is more electric
Road, when the voltage of the output signal three of one-way conduction circuit changes from low to high, on the voltage threshold of stagnant ring comparison circuit is
Threshold point voltage threshold, when signal three, which rises above, visits point of accumulation voltage threshold, the output signal V5 of stagnant ring comparison circuit
Voltage be high level；When the voltage of the output signal three of one-way conduction circuit changes from high to low, stagnant ring comparison circuit
Voltage threshold is Xiamen point of accumulation voltage threshold, when signal three drops to less than Xiamen point of accumulation voltage threshold, stagnant ring comparison circuit
Output signal V5 voltage be low level；Therefore, the output signal of one-way conduction circuit is in the converted of stagnant ring comparison circuit
There are two trip points and visits point of accumulation voltage threshold and Xiamen point of accumulation voltage threshold in Cheng Zhong, two trip point voltage thresholds it
Difference is hysteresis voltage or stagnant ring window.
8. a kind of HALL input signal conditioning circuit according to claim 5, which is characterized in that the stagnant ring is more electric
Road, resistance four (8), the resistance value of resistance five (9) are identical, and resistance four (8), the model of resistance five (9) are consistent, reference voltage signal four
Numerical value V4, be the half of DC simulation supply voltage numerical value VAA.
9. a kind of HALL input signal conditioning circuit according to claim 6, which is characterized in that the reversed buffering electricity
Road, phase inverter one (11), the model of phase inverter two (12) are consistent, and the input signal and output signal of reversed buffer circuit are being passed through
Voltage levels level is consistent after two-stage reverse process.
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Application publication date: 20190111 |