CN109066642A - A kind of two-way over-voltage hysteresis protection circuit of high-precision - Google Patents
A kind of two-way over-voltage hysteresis protection circuit of high-precision Download PDFInfo
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- CN109066642A CN109066642A CN201811102439.XA CN201811102439A CN109066642A CN 109066642 A CN109066642 A CN 109066642A CN 201811102439 A CN201811102439 A CN 201811102439A CN 109066642 A CN109066642 A CN 109066642A
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- 238000005070 sampling Methods 0.000 claims abstract description 24
- 230000003750 conditioning effect Effects 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of two-way over-voltage hysteresis protection circuit of high-precision, including sampling conditioning module, positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module；The input terminal of the sampling conditioning module connects input signal; output end is separately connected the input terminal of the positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module; the output end of the positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module is connected with each other, output over-voltage protection signal.The present invention can need the signal of two-way hysteresis protection to carry out accurately over-voltage hysteresis protection to sine wave, triangular wave etc., mention high control precision and avoid judging over-voltage signal by accident.
Description
Technical field
The present invention relates to electronic circuit field, in particular to processor can only identify positive signal, cannot identify and sample and be negative
The two-way hysteresis of the over-voltage and over-current of signal protects circuit.
Background technique
With the high speed development of power electronics and intelligence science and technology, control and operation processor is constantly updated, and processor is wide
It is general to control aspect applied to data, voice, the high speed mathematical operation of video signal and processing in real time.In current processor,
Most of processor can only identify positive signal and positive level, and negative signal cannot be identified and sampling processing, however
In, often it is related to sampling and handling negative signal, it is common practice to will lift on signal level, make its signal minimum
Greater than 0, maximum value is in processor sampling and identification range.It is well known that also need to carry out overpressure treatment in signal processing,
In order to enable processor effectively to identify over-voltage signal and not false triggering, an effectively reliable voltage sample conditioning circuit and two-way
Hysteresis protection circuit is very important.
Summary of the invention
In order to effectively solve the problems, such as generating positive and negative voltage overvoltage protection and hysteresis point, enable a processor to effectively identify positive and negative
Signal, the present invention provide a kind of two-way over-voltage hysteresis protection circuit of high-precision.
The present invention specifically adopts the following technical scheme that
A kind of two-way over-voltage hysteresis protection circuit of high-precision, it is characterised in that including sampling conditioning module, positive half cycle overvoltage protection
Hysteresis module and negative half period overvoltage protection hysteresis module；The input terminal of the sampling conditioning module connects input signal, output end
It is separately connected the input terminal of the positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module, the positive half cycle
The output end of overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module is connected with each other, output over-voltage protection signal.
Preferably, the negative half period overvoltage protection hysteresis module is by resistance R8 ~ R10, resistance R14, resistance R15, comparator
U4 and triode Q1 composition, one end of resistance R8 connect VDD, and the other end connects the negative input end of comparator U4；Comparator U4's
Output end of the positive input terminal as the input terminal connection sampling conditioning module of negative half period overvoltage protection hysteresis module；Resistance R9 connection
Between the negative input end of comparator U4 and the emitter of triode Q1, the emitter of Q1 is grounded；Resistance R10 is connected to comparator
Between the negative input end of U4 and the collector of triode Q1；One end of the base stage connection resistance R14 of triode Q1, resistance R14's
Output end of the other end as negative half period overvoltage protection hysteresis module, at the same the other end be also connected with resistance R15 after connect VDD；
When negative half period over-voltage does not occur, triode Q1 depth saturation conduction, conduction voltage drop 0V；When negative half period over-voltage, triode is disconnected
It opens.
Beneficial effect
The present invention combines positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module, realizes two-way
The protection of over-voltage hysteresis can need the signal of two-way hysteresis protection to carry out accurately over-voltage hysteresis to sine wave, triangular wave etc. and protect
Shield mentions high control precision and avoids judging over-voltage signal by accident.In negative half period overvoltage protection, the present invention is deep using triode
Saturation conduction technology is spent, two-way over-voltage hysteresis protection has effectively been carried out.
Detailed description of the invention
Fig. 1: the two-way over-voltage hysteresis of present invention high-precision protects circuit diagram；
Fig. 2: input signal triangular wave waveform；
Fig. 3: the triangular wave waveform after conditioning；
Fig. 4: over-voltage protection point and hysteresis point waveform diagram；
Fig. 5: positive half cycle over-voltage simplifies circuit；
Fig. 6: simplification circuit when over-voltage does not occur for negative half period.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without creative efforts
Range.
High-precision of the invention two-way over-voltage hysteresis protection circuit topological structure as shown in Figure 1, include sampling conditioning module,
Positive half cycle overvoltage protection hysteresis module, negative half period overvoltage protection hysteresis module.
Sampling conditioning module includes: R1, R2, R3, R4, R5, R6, C1, C2, C3, C4 and operational amplifier U1, U2.Resistance
One end of R1, R3 are separately connected the positive and negative electrode of input signal, and the other end of resistance R1, R3 are separately connected the reverse phase of amplifier U1
Input terminal, normal phase input end；Resistance R2 and capacitor C2 are connected in parallel between the inverting input terminal and output end of operational amplifier U1；Electricity
Resistance R4 and capacitor C1 is connected in parallel between the normal phase input end and ground of amplifier U1；The output of the one end resistance R5 connection amplifier U1
End, the other end connect the normal phase input end of amplifier U2, and one end of resistance R6 connects reference voltage Vref, other end connection amplification
The normal phase input end of device U2；Capacitor C3 is connected between the normal phase input end and ground of amplifier U2；The anti-phase input of amplifier U2
End connects its output end, and capacitor C4 is connected between the output end and ground of amplifier U2；The normal phase input end conduct of amplifier U2
The output end of sampling conditioning module is connected to the defeated of positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module
Enter end.
Positive half cycle overvoltage protection hysteresis module includes: R11, R12, R13, D1 and comparator U3.One end of resistance R11 connects
VDD, the other end connect the positive input terminal of comparator U3, the positive input terminal of one end connection comparator U3 of resistance R12, another termination
Ground, resistance R13 and diode D1 are connected between the positive input terminal and output end of comparator U3；The negative input end of comparator U3 is made
For the output end of the input terminal connection sampling conditioning module of positive half cycle overvoltage protection hysteresis module, the output end conduct of comparator U3
The output end of the output end connection negative half period overvoltage protection hysteresis module of positive half cycle overvoltage protection hysteresis module.
Negative half period overvoltage protection hysteresis module includes: R8, R9, R10, R14, R15, Q1 and U4.One end of resistance R8 connects
VDD, the other end connect the negative input end of comparator U4；The positive input terminal of comparator U4 is as negative half period overvoltage protection hysteresis module
Input terminal connection sampling conditioning module output end；Resistance R9 is connected to the negative input end of comparator U4 and the hair of triode Q1
Between emitter-base bandgap grading, the emitter of Q1 is grounded；Resistance R10 be connected to comparator U4 negative input end and triode Q1 collector it
Between；One end of the base stage connection resistance R14 of triode Q1, the other end of resistance R14 is as negative half period overvoltage protection hysteresis module
Output end, while the other end be also connected with resistance R15 after connect VDD.
Over-sampling modulate circuit main function is conditioning sampling no-load voltage ratio, negative voltage signal is carried out upper lift and enhances signal matter
Amount, makes it meet processor sampling request.Positive half cycle overvoltage protection hysteresis module is substantially carried out positive half cycle overvoltage protection protection point
It is arranged with hysteresis point, positive half cycle sampling comparison signal enters comparator U3 negative input.Negative half period overvoltage protection hysteresis module is main
Negative half period overvoltage protection protection point and the setting of hysteresis point are carried out, negative half period sampling comparison signal enters comparator U4 positive input.
Two-way over-voltage hysteresis protection circuit is mainly used in needing to carry out in bidirectional protective circuit in high precision, such as sinusoidal
Wave, triangular wave and other signals for needing two-way hysteresis to protect introduce the two-way mistake of high-precision below using triangular wave as input signal
Hysteresis is pressed to protect circuit operation principle, i.e. input signal V1 in Fig. 1 is triangular wave, waveform such as Fig. 2.
1. detection voltage V1 is triangular wave, signal obtains V2 and V3 after flowing through signal conditioning circuit, and conditioning circuit is mainly adopted
With differential amplifier circuit, follower and refer to upper lift circuit.Be 0 according to differential amplification principle and node current, as R1=R3, R2
=R4, it is known that gain amplifier A=R2/R1, voltage lifting are referenced as REF=R5*Vref/ (R5+R6).Vref is reference voltage, in mesh
In the processor of preceding application, sample range is generally 0-3V, therefore Vref is traditionally arranged to be 3V.V2=V3=(V1*R6*R2/R1+
Vref*R5)/(R5+R6) due to consideration that processor can only sample the signal greater than 0, and requires peak signal that cannot be greater than
Processor sample range, therefore only need to adjust R1, R2, R3, R4, R5, R6 and sample reference waveform, waveform such as Fig. 3 institute can be obtained
Show.
2. sample reference waveform such as Fig. 3 after conditioning needs to protect equipment and personnel safety etc. in engineering, when
It when voltage is greater than certain setting value, needs to issue over-voltage signal, while signal being needed to be kept for certain time, facilitate to handle in this way
Device identifies and takes action, while avoiding malfunctioning.Such as Fig. 4, it is A that positive half cycle, which needs pressure point to be protected of crossing, and hysteresis point is B, is born
The protection point that half cycle needs is C, and hysteresis point is D.
3. as can be seen from FIG. 1, when non-over-voltage, comparator U3, U4 export high-impedance state, therefore over-voltage signal Over signal is
High level, when over-voltage occurs, U3, U4 export low resistance state, therefore over-voltage signal Over signal is low level, when processor is examined
Over-voltage is reported after measuring low level certain time.
4. positive half cycle over-voltage hysteresis principle, when V3 point voltage is greater than V5, positive half cycle over-voltage, comparator U3 exports low electricity
Flat, with being equivalent to sample reference, reference point voltage V5 is reduced, therefore over-voltage signal is just removed when voltage being needed to drop to hysteresis value, just
Reference waveform such as Fig. 5 after half cycle over-voltage, according to Fig. 1 and Fig. 5:
Positive half cycle crosses the voltage of pressure point A: A=VDD*R12/ (R12+R11)
The voltage of positive half cycle over-voltage hysteresis point B: B=VDD*(R12 | | R13)/(R12 | | R13+R11)
5. negative half period over-voltage hysteresis principle, when negative half period over-voltage does not occur, the conducting of triode depth is equivalent to R9 and R8 simultaneously
Connection, comparison voltage is parallel resistance institute component voltage V4.When V3 point voltage is less than V4, negative half period over-voltage, comparator exports low electricity
Flat, with being equivalent to sample reference, triode turns off at this time, and reference point voltage V4 is increased, therefore when voltage being needed to rise to hysteresis value
Over-voltage signal is just removed, reference waveform such as Fig. 6 when the non-over-voltage of negative half period, as can be seen from FIG. 6:
Negative half period crosses the voltage of pressure point C: C=VDD*(R9 | | R10)/(R9 | | R10+R8)
The voltage of negative half period over-voltage hysteresis point D: D=VDD*R9/ (R8+R9)
6. positive half cycle hysteresis depth can adjust R11, R12 and R13 according to actual needs.
7. negative half period hysteresis depth can adjust R8, R8 and R10 according to actual needs.
8. configuration is connected in the triode Q1 of negative half period, this circuit uses triode depth and is saturated function, in this way can be true
The conduction voltage drop for protecting triode is 0V, excludes triode pressure drop interference, improves protection point precision.
9. in order to ensure the conducting of triode Q1 depth, the current transfer ratio of general triode is 1:10, i.e. IB=1mA can be with
IC=10mA of saturation conduction, so the condition of two-way hysteresis protection circuit triode depth conducting are as follows:
V4/R10 < < 10*VDD/ (R14+R15).
Claims (5)
1. a kind of two-way over-voltage hysteresis of high-precision protects circuit, it is characterised in that protected including sampling conditioning module, positive half cycle over-voltage
Protect hysteresis module and negative half period overvoltage protection hysteresis module；The input terminal of the sampling conditioning module connects input signal, output
End is separately connected the input terminal of the positive half cycle overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module, and described just half
The output end of all overvoltage protection hysteresis modules and negative half period overvoltage protection hysteresis module is connected with each other, output over-voltage protection signal.
2. the two-way over-voltage hysteresis of high-precision as described in claim 1 protects circuit, it is characterised in that the sampling conditioning module
It is made of resistance R1 ~ R6, capacitor C1 ~ C4, operational amplifier U1, U2, one end of resistance R1, R3 are separately connected input signal
Positive and negative electrode, the other end of resistance R1, R3 are separately connected the inverting input terminal of amplifier U1, normal phase input end；Resistance R2 and capacitor
C2 is connected in parallel between the inverting input terminal and output end of operational amplifier U1；Resistance R4 and capacitor C1 are being connected in parallel on amplifier U1 just
Between phase input terminal and ground；The one end resistance R5 connects the output end of amplifier U1, and the other end connects the positive input of amplifier U2
End, one end of resistance R6 connect reference voltage Vref, and the other end connects the normal phase input end of amplifier U2；Capacitor C3, which is connected to, to be put
Between the normal phase input end and ground of big device U2；The inverting input terminal of amplifier U2 connects its output end, and capacitor C4 is connected to amplification
Between the output end and ground of device U2；The normal phase input end of amplifier U2 is connected to positive half cycle as the output end of sampling conditioning module
Overvoltage protection hysteresis module and negative half period overvoltage protection hysteresis module.
3. the two-way over-voltage hysteresis of high-precision as described in claim 1 protects circuit, it is characterised in that the positive half cycle over-voltage is protected
Shield hysteresis module is made of resistance R11 ~ R13, comparator U3, diode D1, and one end of resistance R11 connects VDD, other end connection
The positive input terminal of comparator U3, the positive input terminal of one end connection comparator U3 of resistance R12, other end ground connection, resistance R13 and two
Pole pipe D1 is connected between the positive input terminal and output end of comparator U3；The negative input end connection sampling conditioning module of comparator U3
Output end, the output end of comparator U3 connects negative half period overvoltage protection as the output end of positive half cycle overvoltage protection hysteresis module
The output end of hysteresis module.
4. the two-way over-voltage hysteresis of high-precision as described in claim 1 protects circuit, it is characterised in that the negative half period over-voltage is protected
Shield hysteresis module is made of resistance R8 ~ R10, resistance R14, resistance R15, comparator U4 and triode Q1, and one end of resistance R8 connects
VDD is met, the other end connects the negative input end of comparator U4；The positive input terminal of comparator U4 is as negative half period overvoltage protection hysteresis mould
The output end of the input terminal connection sampling conditioning module of block；Resistance R9 is connected to the negative input end and triode Q1 of comparator U4
Between emitter, the emitter of Q1 is grounded；Resistance R10 be connected to comparator U4 negative input end and triode Q1 collector it
Between；One end of the base stage connection resistance R14 of triode Q1, the other end of resistance R14 is as negative half period overvoltage protection hysteresis module
Output end, while the other end be also connected with resistance R15 after connect VDD；When negative half period over-voltage does not occur, triode Q1 depth
Saturation conduction, conduction voltage drop 0V；When negative half period over-voltage, triode is disconnected.
5. the two-way over-voltage hysteresis of high-precision as claimed in claim 4 protects circuit, it is characterised in that:
V4/R10 < < 10*VDD/ (R14+R15), wherein V4 is the input voltage of comparator U4 negative input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811102439.XA CN109066642B (en) | 2018-09-20 | 2018-09-20 | High-precision bidirectional overvoltage hysteresis protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811102439.XA CN109066642B (en) | 2018-09-20 | 2018-09-20 | High-precision bidirectional overvoltage hysteresis protection circuit |
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| CN109066642A true CN109066642A (en) | 2018-12-21 |
| CN109066642B CN109066642B (en) | 2024-04-05 |
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| Publication number | Publication date |
|---|---|
| CN109066642B (en) | 2024-04-05 |
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