CN108270419A - A kind of shaping circuit - Google Patents
A kind of shaping circuit Download PDFInfo
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- CN108270419A CN108270419A CN201810169010.6A CN201810169010A CN108270419A CN 108270419 A CN108270419 A CN 108270419A CN 201810169010 A CN201810169010 A CN 201810169010A CN 108270419 A CN108270419 A CN 108270419A
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- voltage
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- threshold triggers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/12—Shaping pulses by steepening leading or trailing edges
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
Abstract
The present invention provides a kind of shaping circuit, including：First resistor, second resistance, 3rd resistor, threshold triggers module and constant current source module；The first resistor and second resistance divide input voltage, for determining the forward threshold voltage of this shaping circuit；The threshold triggers module for the magnitude relationship according to the voltage after partial pressure and the reference voltage of the threshold triggers module, selects on or off, while act on by the pull-up of the 3rd resistor, realizes the shaping feature to input signal；The constant current source module provides output to the Current Negative Three-Point Capacitance of input, for determining the negative sense threshold voltage of this shaping circuit.The present invention can accurately be set forward threshold voltage, it sets precision, and up to 0.5%, so as to reduce phase measurement error, while the setting of forward threshold voltage is not influenced by negative sense threshold voltage, it is hereby achieved that big hysteresis voltage, improves circuit anti-interference ability.
Description
Technical field
The present invention relates to shaping circuit technical field, more particularly, to a kind of shaping circuit.
Background technology
In rotating machinery vibrating measurement, key phase is the phase for measuring rotating machinery.In rotating machinery
In vibration measurement, phase has its particular meaning.It refers to the phase difference between a certain label in vibration signal and shaft.Equipped with turn
Axis is as shown in Figure 1, a certain position is made marks using reflective tape or keyway on axis, installation key phase.Whenever in shaft
When label is turned at key phase, a pulse signal will be generated.Phase is defined as reference pulse and vibration signal
Phase difference between certain upper point (such as posivtive spike or zero etc.).
Due to the physical characteristic of key phase, the pulse signal of output is not the rectangular pulse of standard, but has
The rising edge of 200-500us in addition, the pulse obtained from key phase tends to occur meeting wave distortion after transmission, works as biography
When capacitance on defeated line is larger, the rising edge of waveform will significantly slow down；When transmission line is longer, and the impedance and transmission of receiving terminal
During the impedance mismatch of line, oscillatory occurences will be generated in the rising edge and failing edge of waveform；When other pulse signals pass through conducting wire
Between distribution capacity or public power wire be added to rectangular pulse signal when, additional noise will occur on signal.Therefore it is necessary
Shaping is carried out to this pulse signal, so as to subsequent conditioning circuit processing.In order to improve antijamming capability, need using schmidt trigger
Device.Schmidt trigger is a kind of special gate circuit, different from common gate circuit, and there are two threshold value electricity for Schmidt trigger
Pressure, is referred to as forward threshold voltage and negative sense threshold voltage.In input signal from during low level rises to high level
The changed input voltage of circuit state is made to be known as forward threshold voltage, is dropped in input signal from high level low level
The changed input voltage of circuit state is made to be known as negative sense threshold voltage in the process.Forward threshold voltage and negative sense threshold voltage
Difference be known as hysteresis voltage, the presence of exactly hysteresis voltage improves the antijamming capability of Schmidt trigger.Using close with applying
Special trigger carries out shaping to the signal that key phase exports can arrive more satisfactory rectangular pulse waveform, as long as Schmidt
The forward threshold voltage and negative sense threshold voltage of trigger set properly, can receive satisfied shaping effect and provide certain
Antijamming capability.
In rotating machinery vibrating measurement, accurate phase information in order to obtain, to the signal of key phase output into
The forward threshold voltage of the accurate setting Schmidt trigger of needs during row shaping, and existing Schmidt trigger, are either adopted
It is realized with tunnel diode or transistor, can not all ensure the precision of forward threshold voltage, the higher scheme of precision is to adopt
It is realized with comparator with positive feedback mode, then is aided with zener diode and clamper is carried out to output, but due to the essence of zener diode
The problems such as offset voltage of degree and comparator, this scheme still dislikes inaccurate, precision to the control of forward threshold voltage
It can only control below 2%.In addition, key phase working environment noise is big, the noise so as to cause its output is also big, therefore
It is required that larger hysteresis voltage can be provided when carrying out shaping to the signal of key phase output, to improve the anti-interference energy of circuit
Power, and the forward threshold voltage of existing Schmidt trigger scheme and the setting of negative sense threshold voltage can be interrelated, cause very
Hardly possible obtains larger hysteresis voltage.
Invention content
The present invention provides a kind of a kind of shaping circuit for overcoming the above problem or solving the above problems at least partly.
According to an aspect of the present invention, a kind of shaping circuit is provided, including：First resistor, second resistance, third electricity
Resistance, threshold triggers module；
Input signal is connected with the first end of the first resistor, the second end of the first resistor and the second resistance
First end be connected, the second end of the second resistance is connected with ground wire；
The first end of the threshold triggers module simultaneously with the second end of the first resistor, the second resistance first
End is connected, and the second end of the threshold triggers module is connected with ground wire, third end and the third of the threshold triggers module
The first end of resistance is connected, the threshold triggers module, voltage and institute for the first end according to the threshold triggers module
The magnitude relationship of the reference voltage of threshold triggers module is stated, selects on or off, and when the threshold triggers module is connected,
The output voltage of the threshold triggers module is constant；
Output signal is connected with the first end of the 3rd resistor, the third end of the threshold triggers module, the third
The second end of resistance is connected with supply voltage.
Preferably, further include constant current source module, the first end of the constant current source module simultaneously with the first resistor the
Two ends, the second resistance first end be connected, the second end of the constant current source module simultaneously with the threshold triggers module
Third end, the 3rd resistor first end be connected, the third end of the constant current source module is connected with the supply voltage.
The present invention proposes a kind of shaping circuit, and forward threshold voltage accurately can be set, and setting precision is reachable
0.5%.So as to reduce phase measurement error.The setting of forward threshold voltage is not influenced by negative sense threshold voltage, so as to
Big hysteresis voltage is obtained, improves circuit anti-interference ability.
Description of the drawings
Fig. 1 is the schematic diagram that key phase measures rotating machinery phase in the prior art；
Fig. 2 is a kind of circuit diagram of shaping circuit of the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of shaping circuit of one embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but be not limited to the scope of the present invention.
The embodiment of the present invention provides a kind of shaping circuit, which includes：First resistor, second resistance, third electricity
Resistance, threshold triggers module and constant current source module；
Input signal is connected with the first end of the first resistor, the second end of the first resistor and the second resistance
First end be connected, the second end of the second resistance is connected with ground wire；
The first end of the threshold triggers module simultaneously with the second end of the first resistor, the second resistance first
End is connected, and the second end of the threshold triggers module is connected with ground wire, third end and the third of the threshold triggers module
The first end of resistance is connected, the threshold triggers module, voltage and institute for the first end according to the threshold triggers module
The magnitude relationship of the reference voltage of threshold triggers module is stated, selects on or off, and when the threshold triggers module is connected,
The output voltage of the threshold triggers module is constant；
Output signal is connected with the first end of the 3rd resistor, the third end of the threshold triggers module, the third
The second end of resistance is connected with supply voltage.
First resistor and second resistance first divide input signal, threshold triggers module divided after electricity
It presses, the voltage after partial pressure is exactly the voltage between first resistor and second resistance, by the voltage after partial pressure and threshold triggers module
Reference voltage compare, if more than the reference voltage of threshold triggers module, the conducting of threshold triggers module exports constant voltage,
At this point, the output voltage of shaping circuit is exactly the output voltage of threshold triggers module, by the output of shaping circuit in such cases
Voltage is known as the first output voltage.
If the input voltage of threshold triggers module first end is less than its reference voltage, threshold triggers module is always maintained at cutting
Only, in such cases, one end of 3rd resistor is connect with supply voltage, and the output signal connection of the other end and shaping circuit is led to
Cross the pull-up effect of 3rd resistor so that the output voltage of shaping circuit is equal with supply voltage, will in such cases shaping it is electric
The output voltage on road is known as the second output voltage.
The constant current source module is used to provide output to the Current Negative Three-Point Capacitance of input, and first end is electric with described first simultaneously
The second end of resistance, the first end of the second resistance are connected, the second end of the constant current source module simultaneously with the threshold triggers
The third end of module, the first end of the 3rd resistor are connected, the third end of the constant current source module and the supply voltage phase
Even.
The embodiment of the present invention compares the size of voltage and reference voltage after partial pressure, selects phase by threshold triggers module
The operating mode answered realizes the shaping operation to input signal.Pass through first resistor, second resistance and threshold triggers mould simultaneously
Block can accurately set the forward threshold voltage of this shaping circuit；It is acted on additionally by the Current Negative Three-Point Capacitance of constant current source module, it can
To set the negative sense threshold voltage of this shaping circuit, and the setting of forward threshold voltage is not influenced.
On the basis of above-described embodiment, it is preferable that the threshold triggers module is specifically used for：
If the voltage of the first end of the threshold triggers module is less than the reference voltage of the threshold triggers module, and described
The voltage of the first end of threshold triggers module gradually increases and more than the reference voltage of the threshold triggers module, and the threshold value is touched
Module conducting is sent out, the output voltage of the threshold triggers module is constant, so that the first output voltage of the shaping circuit is permanent
It is fixed.
When the shaping circuit is just started to work, the voltage after partial pressure is less than the reference voltage of threshold triggers module, at this time
Threshold triggers module is off always, and one end of 3rd resistor is connect with supply voltage, the output of the other end and shaping circuit
Signal connects, and is acted on by the pull-up of 3rd resistor so that and the output voltage of shaping circuit is equal with supply voltage, that is, the
Two output voltages are equal with supply voltage.
Then due to input voltage slowly becomes larger, the voltage after partial pressure also becomes larger, and voltage after partial pressure is more than threshold
When being worth the reference voltage of trigger module, threshold triggers module will be connected, and threshold triggers module exports constant voltage, whole at this time
The output voltage of shape circuit is equal with the output voltage of threshold triggers module, that is, the first output voltage and threshold triggers module
Output voltage it is equal.Input voltage at this time is exactly the forward threshold voltage of this shaping circuit simultaneously.
On the basis of above-described embodiment, it is preferable that constant current source module, the first end of the constant current source module simultaneously with institute
State the second end of first resistor, the first end of the second resistance is connected, the second end of the constant current source module simultaneously with it is described
The third end of threshold triggers module, the first end of the 3rd resistor are connected, third end and the confession of the constant current source module
Piezoelectric voltage is connected；
The constant current source module is used to provide output to the Current Negative Three-Point Capacitance of input, when the first of the threshold triggers module
When the voltage at end is more than the reference voltage of the threshold triggers module, the constant current source module exports constant current, described in adjustment
Voltage between first resistor and the second resistance, if the voltage after adjustment between the first resistor and the second resistance
Less than the reference voltage of the threshold triggers module, the threshold triggers module cut-off.
When the voltage of the first end of threshold triggers module is more than the reference voltage of threshold triggers module, threshold triggers module
In the conduction state, if the beginning of input voltage slowly reduces, the voltage after partial pressure also begins to slowly reduce, electricity after partial pressure
When pressure is reduced to big as the reference voltage of threshold triggers module, constant current source module starts to export constant current, at this
Under the action of constant current, the voltage between first resistor and second resistance is also affected, when continuous current and input voltage
The electric current of offer the pressure drop in second resistance just be equal to threshold triggers module reference voltage when, if at this time input voltage after
Continuous to reduce, threshold triggers module will become cut-off state from conducting, under the action of 3rd resistor, shaping circuit output second
Output voltage, the second output voltage and supply voltage it is equal in magnitude.Input voltage at this time is exactly this shaping circuit simultaneously
Negative sense threshold voltage.
On the basis of above-described embodiment, it is preferable that the threshold triggers module is three end adjustable shunt reference sources；
Wherein, the reference edge of three end adjustable shunt reference source simultaneously with the second end of the first resistor, described the
The first end of two resistance is connected, and the second end of the first resistor is connected with the first end of the second resistance, and three end can
The anode of shunt reference source is adjusted to be connected with ground wire, the cathode of three end adjustable shunt reference source and the first end phase of 3rd resistor
Even.
Fig. 2 is a kind of circuit diagram of shaping circuit of the embodiment of the present invention, as shown in Fig. 2, the circuit includes：First resistor
R1, second resistance R2,3rd resistor R3, threshold triggers module, wherein, threshold triggers module is three end adjustable shunt reference sources
TL431 chips, first resistor R1 and second resistance R2 series connection, the first end of first resistor R1 are connected with input signal Vin, and second
The second end of resistance R2 is connected with ground wire, and the reference edge REF of three end adjustable shunt reference source TL431 is simultaneously with first resistor R1's
Second end, the first end of second resistance R2 are connected, and the second end of first resistor R1 is connected with the first end of second resistance R2, three ends
The anode ANODE of adjustable shunt reference source TL431 is connected with ground wire, the cathode CATHODE of three end adjustable shunt reference source TL431
It is connected with the first end of 3rd resistor R3, the second end of 3rd resistor R3 is connected with supply voltage VCC, and output signal Vout is simultaneously
It is connected with the first end of 3rd resistor R3, the cathode CATHODE of three end adjustable shunt reference source TL431.
It should be noted that three end adjustable shunt reference sources are controllable accurate source of stable pressure.Two electricity of its output voltage
Resistance can be arbitrarily set from reference voltage VrefAny value in the range of to 36V.
TL431 is the three end adjustable shunt reference sources for having good thermal stability, when being operated in open loop mode
(i.e. REF pins are not connect with CATHODE pins) can use as comparator, wherein internal provide 2.5V high-precision references
Voltage Vref, precision 0.4%, equivalent 50ppm/ DEG C of gamut temperature coefficient, there is no imbalances when in addition it is used as comparator
Voltage.These characteristics of TL431 are exactly utilized, this circuit provides the accurate setting to forward threshold voltage.
During the circuit works, first resistor R1 and second resistance R2 are used to adjust forward threshold voltage size,
3rd resistor R3 provides operating current for TL431, while as the pulling drive of output Vout.
When Vin input amplitude it is smaller, by the REF that TL431 is input to after the partial pressure of first resistor R1 and second resistance R2
The voltage of pin is not yet more than TL431 internal reference voltages VrefWhen, TL431 cut-offs, at this time since resistance R4 is pulled upward to VCC,
Vout output voltages are also VCC.
With the increase of Vin input amplitudes, Vout still keeps output voltage as VCC, when Vin input amplitudes are more than Vref*
(R1+R2)/R2 when, the voltage of the REF pins of TL431 has been more than TL431 internal reference voltages Vref at this time, TL431 conductings,
Vout outputs are overturn, and voltage drops to about 2V (this is TL431 output characteristics), if Vin inputs amplitude continues to increase at this time,
Vout still keeps output voltage as 2V or so.Therefore, the size of this circuit forward threshold voltage is：
V+=Vref*(R1+R2)/R2 (1)
In formula (1), VrefFor the reference voltage inside TL431, precision is up to 0.4%, if choice accuracy is
0.1% resistance R1, R2, then R1, R2 can only additionally introduce 0.1% error, along with the influence of no offset voltage, therefore
The forward threshold voltage precision of this circuit can reach 0.5% precision.
Due to only focusing on the precision of forward threshold voltage in rotating machinery phase measurement, the embodiment of the present invention uses TL431
Chip improves the precision of shaping circuit forward threshold voltage, so as to improve shaping capability.Using this precision truing circuit,
The precision and antijamming capability of rotating machinery phase measurement can be improved, so as to improve rotating machinery fault is identified it is correct
Rate.
On the basis of above-described embodiment, it is preferable that the constant current source module specifically includes：4th resistance R4, the 5th electricity
Hinder R5, the first triode Q1 and the second triode Q2；
Wherein, the collector of the first triode Q1 simultaneously with the second end of the first resistor R1, second electricity
The first end of resistance R2 is connected, the base stage of the first triode Q1 simultaneously with the collector of the second triode Q2, described the
The first end of four resistance R4 is connected, the emitter of the first triode Q1 while the first end with the 5th resistance R5, institute
The base stage for stating the second triode Q2 is connected, and the second end of the 5th resistance R5 is connected with the supply voltage, and the described 2nd 3
The emitter of pole pipe Q2 is connected with the supply voltage, the second end of the 4th resistance R4 simultaneously with three end adjustable shunt
The cathode of a reference source, the 3rd resistor R3 first end be connected.
4th resistance R4 is provided partially for the constant-current source being made of the first triode Q1, the second triode Q2 and the 5th resistance R5
Put electric current.
When the shaping circuit includes constant current source module, the operation principle of the shaping circuit is as follows：
When Vin input amplitude it is smaller, by the REF that TL431 is input to after the partial pressure of first resistor R1 and second resistance R2
The voltage of pin is not yet more than TL431 internal reference voltages VrefWhen, TL431 cut-offs, at this time since resistance R4 is pulled upward to VCC,
Vout output voltages are also VCC.So as to make the constant-current source being made of the first triode Q1, the second triode Q2 and the 5th resistance R5
It does not work, is flowed out without electric current from the first triode Q1.
With the increase of Vin input amplitudes, Vout still keeps output voltage as VCC, when Vin input amplitudes are more than Vref*
(R1+R2)/R2 when, the voltage of the REF pins of TL431 has been more than TL431 internal reference voltages Vref at this time, TL431 conductings,
Vout outputs are overturn, and voltage drops to about 2V (this is TL431 output characteristics), if Vin inputs amplitude continues to increase at this time,
Vout still keeps output voltage as 2V or so.
When Vin input amplitudes are more than the forward threshold voltage V of this circuit+When, Vout output voltages drop to about 2V, at this time
The constant-current source of first triode Q1, the second triode Q2 and the 5th resistance R5 compositions is started to work, and one is provided to second resistance R2
A electric current Iq, if Vin inputs amplitude and starts to reduce at this time, when being reduced to just than forward threshold voltage V+When low, due to electric current
The presence of Iq, not yet less than TL431 internal reference voltages Vref, Vout outputs will not occur the voltage of the REF pins of TL431
Overturning, remains at 2V or so.
Only when Vin inputs amplitude continues to reduce, during so as to make to reduce Iq by the electric current of resistance R1, what constant-current source provided
Pressure drop of the sum of the electric current that electric current and input Vin are provided on R2 is just equal to TL431 internal reference voltage Vref, as long as at this time
Vin inputs amplitude continues to reduce, and TL431 can end, and Vout outputs can be overturn, and voltage becomes VCC again.
Because of Iq=Veb/R5, and R1 electric currents is allowed, which to reduce Iq, to be needed to reduce voltage V=Iq*R1, therefore this circuit negative sense threshold
The size of threshold voltage is：
V-=V+-R1*Veb/R5 (2)
The hysteresis voltage of this circuit is：
Vc=V+-V-=R1*Veb/R5 (3)
From formula (3) as can be seen that hysteresis voltage can only be powered, resistance R5 is adjusted, and does not influence positive threshold electricity completely
The setting of pressure, therefore big hysteresis voltage can be obtained.Hysteresis voltage determines the antijamming capability of shaping circuit, hysteresis voltage
Bigger, antijamming capability is stronger.
The constant-current source of the first triode Q1, the second triode Q1 and the 5th resistance R5 compositions is used in the embodiment of the present invention
The current feedback that Vout is output to Vin inputs is provided, so as to fulfill the negative sense threshold voltage of this shaping circuit.It is anti-using constant-current source
Feedback, can more accurately provide the setting of negative sense threshold voltage, while do not influence the setting of forward threshold voltage completely, so as to
Big hysteresis voltage is obtained, improves circuit anti-interference ability.
The shaping that key signal exports in being measured for rotating machinery, it is desirable that forward threshold voltage 5V, precision 0.5%,
Hysteresis voltage is 4V.According to the computational methods of formula (1) (2) (3), shown in parameter selection Fig. 3 of each component：
In figure 3, the TL431 of choice accuracy 0.4%, internal reference voltage VrefFor 2.5V, choice accuracy 0.1%
First resistor R1 and second resistance R2, first resistor R1 is 10k, second resistance R2 is 5k, can be calculated just according to formula (1)
To threshold voltage：
V+=Vref* (R1+R2)/R2=2.5* (10+5)/5=5V.
The Veb voltages of other second triode Q2 are about 0.8V, and resistance R5 selects 2k, can be calculated back according to formula (3)
Potential difference：
Vc=V+-V-=R1*Veb/R5=10*0.8/2=4V.
The 4th resistance R4 of constant-current source selects 5k, can meet the requirement of constant-current source bias electric current.
Pulling drive 3rd resistor R3 provides operating current for TL431, and operating current is bigger, and the response time of TL431 gets over
Soon, i.e., the rectangular pulse rising edge after shaping is steeper, can further improve phase measurement accuracy in this way, therefore R3 resistance values are not
Energy selection is too big, selects 1k in this realization circuit, can obtain the faster response time.
In addition, the supply voltage VCC of this circuit recommends 5V~12V, the VCC less than 4V can not make the normal work of this circuit
Make, powered in this realization circuit using 5V power supplys.
To sum up, the present invention can accurately be set forward threshold voltage, and setting precision is up to 0.5%.So as to reduce
Phase measurement error.The setting of forward threshold voltage is not influenced by negative sense threshold voltage, it is hereby achieved that big return difference electricity
Pressure improves circuit anti-interference ability.
Finally, method of the invention is only preferable embodiment, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in the protection of the present invention
Within the scope of.
Claims (9)
1. a kind of shaping circuit, which is characterized in that including：First resistor, second resistance, 3rd resistor and threshold triggers module；
Input signal is connected with the first end of the first resistor, and the of the second end of the first resistor and the second resistance
One end is connected, and the second end of the second resistance is connected with ground wire；
The first end of the threshold triggers module while second end, the first end phase of the second resistance with the first resistor
Even, the second end of the threshold triggers module is connected with ground wire, third end and the 3rd resistor of the threshold triggers module
First end be connected, the threshold triggers module, voltage and the threshold for the first end according to the threshold triggers module
It is worth the magnitude relationship of the reference voltage of trigger module, selects on or off, and when the threshold triggers module is connected, it is described
The output voltage of threshold triggers module is constant；
Output signal is connected with the first end of the 3rd resistor, the third end of the threshold triggers module, the 3rd resistor
Second end be connected with supply voltage.
2. circuit according to claim 1, which is characterized in that the threshold triggers module is specifically used for：
If the voltage of the first end of the threshold triggers module is less than the reference voltage of the threshold triggers module, and the threshold value
The voltage of the first end of trigger module gradually increases and more than the reference voltage of the threshold triggers module, the threshold triggers mould
Block is connected, and the output voltage of the threshold triggers module is constant.
3. circuit according to claim 2, which is characterized in that further include：
Constant current source module, the first end of the constant current source module while second end, the second resistance with the first resistor
First end be connected, the second end of the constant current source module simultaneously with the third end of the threshold triggers module, third electricity
The first end of resistance is connected, and the third end of the constant current source module is connected with the supply voltage；
The constant current source module is used to provide output to the Current Negative Three-Point Capacitance of input, when the first end of the threshold triggers module
When voltage is more than the reference voltage of the threshold triggers module, the constant current source module exports constant current, adjustment described first
Voltage between resistance and the second resistance, if the voltage after adjustment between the first resistor and the second resistance is less than
The reference voltage of the threshold triggers module, the threshold triggers module cut-off.
4. circuit according to claim 3, which is characterized in that the threshold triggers module is three end adjustable shunt reference sources；
Wherein, the reference edge of three end adjustable shunt reference source simultaneously with the second end of the first resistor, second electricity
The first end of resistance is connected, and the anode of three end adjustable shunt reference source is connected with ground wire, three end adjustable shunt reference source
Cathode be connected with the first end of 3rd resistor.
5. circuit according to claim 4, which is characterized in that the constant current source module specifically includes：4th resistance, the 5th electricity
Resistance, the first triode and the second triode；
Wherein, the collector of first triode simultaneously with the second end of the first resistor, the second resistance first
End is connected, the base stage of first triode first end with the collector of second triode, the 4th resistance simultaneously
It is connected, the emitter of first triode while first end, the base stage phase of second triode with the 5th resistance
Even, the second end of the 5th resistance is connected with the supply voltage, the emitter of second triode and the power supply electricity
Pressure is connected, the second end of the 4th resistance simultaneously with the cathode of three end adjustable shunt reference source, the 3rd resistor
First end is connected.
6. circuit according to claim 4, which is characterized in that three end adjustable shunt reference source is TL431 chips.
7. circuit according to claim 1, which is characterized in that the precision of three end adjustable shunt reference source is 0.4%.
8. circuit according to claim 1, which is characterized in that the precision of the first resistor is 0.1%, the second resistance
Precision be 0.1%.
9. circuit according to claim 1, which is characterized in that the reference voltage of three end adjustable shunt reference source is
2.5V, the supply voltage are 5V.
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