CN106680575B - Voltage jump detection circuit and method - Google Patents
Voltage jump detection circuit and method Download PDFInfo
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- CN106680575B CN106680575B CN201611256770.8A CN201611256770A CN106680575B CN 106680575 B CN106680575 B CN 106680575B CN 201611256770 A CN201611256770 A CN 201611256770A CN 106680575 B CN106680575 B CN 106680575B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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Abstract
The invention discloses a kind of voltage jump detection circuit and methods, its circuit includes that sequentially connected voltage signal processing circuit, split-phase delay circuit and compare output circuit, voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R10 and zener diode D1, it includes capacitor C1 that split-phase, which delays circuit, the first proportion resistor network being made of resistance R5 and resistance R7, and the second proportion resistor network being made of resistance R6 and resistance R8；Comparing output circuit includes comparator U2 and resistance R11；Its method is comprising steps of the connection of one, detection circuit, two, voltage sampling, three, voltage jump judgement.The case where circuit structure of the present invention is simple, and rationally, it is convenient and at low cost to realize for design, can be quickly and effectively detected voltage jump, it is practical, it is applied widely, there is good application value.
Description
Technical field
The invention belongs to voltage jump detection technique fields, and in particular to a kind of voltage jump detection circuit and method.
Background technique
Passive perceptual device includes inductance, transformer etc., is widely used in various circuits, when containing these perceptual devices
When disjunction failure occurs for the tie point in the circuit of part, it will generate voltage jump at the disjunction in circuit, and may cause electricity
Arc or instantaneous high pressure, at this point, if not using certain safeguard measure, it would be possible to the important devices in defective loop, very
Personal safety to around harm, therefore it is necessary to carry out voltage jump detection to the both end voltage of perceptual device.
Realize that the mode of voltage jump detection has at present: the 1. design based on high-speed a/d sampling A/D chip and microprocessor,
Main operational principle be within the regular hour, according to the amplitude of front and back double sampling voltage change whether be more than setting threshold value
To realize detection；2. being divided into two paths of signals by differential and integral simulation signal processing circuit to be compared, voltage slope is realized
Change the detection at very fast moment, main operational principle is the time rate of change according to differential circuit output voltage and input voltage
Proportional, the output voltage of integrating circuit delays input voltage, and the input voltage signal of processing is compared, so that it is determined that electric
At the time of pressure mutation.The design of employing mode 1., although it is high to the detection accuracy of voltage jump, fast response time, it is needed
The programming of microprocessor is wanted, design complexities are high, and higher cost, have inconvenience to application person more；Employing mode setting 2.
Meter, working principle is simple, and cost of implementation is lower, and using convenience, but detection accuracy is not high, and the selection of circuit parameter is more
It is not easy.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of circuit structure
Simply, design is rationally, realization is convenient and at low cost, can fast and effeciently detect the case where voltage jump, is practical, applicable
Range is wide, the inductance disjunction voltage jump detection circuit with good application value.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of voltage jump detection circuit, feature
It is: delays circuit including sequentially connected voltage signal processing circuit, split-phase and compare output circuit, at the voltage signal
Reason circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R10 and zener diode D1, described
One end of resistance R1 is that one end of sample point cathode voltage the input terminal VIN-, the resistance R3 of voltage signal processing circuit are electricity
The sample point cathode voltage input terminal VIN+ of signal processing circuit is pressed, sample point cathode voltage is by concatenated resistance R1 and resistance R2
The resistor voltage divider network of composition is connected to ground, the anti-phase input of the connecting pin and instrumentation amplifier U1 of the resistance R1 and resistance R2
End connection, sample point cathode voltage are connected to ground, the electricity by the resistor voltage divider network that concatenated resistance R3 and resistance R4 are constituted
The connecting pin of resistance R3 and resistance R4 is connect with the non-inverting input terminal of instrumentation amplifier U1, two gains of the instrumentation amplifier U1
Gain setting resistor RG, the plus earth of the zener diode D1, the zener diode D1 are connected between resistance connecting pin
Cathode connect with the Voltage Reference end of instrumentation amplifier U1, the Voltage Reference end of the instrumentation amplifier U1 also passes through resistance
R10 is connect with the output end VCC of external power supply power supply；It includes capacitor C1 that the split-phase, which delays circuit, by resistance R5 and resistance R7
First proportion resistor network of composition, and the second proportion resistor network being made of resistance R6 and resistance R8；The resistance R5
Resistance value, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionIt is described
One end of resistance R5 is connect with the output end of instrumentation amplifier U1, and the other end of the resistance R5 is grounded by resistance R7, described
One end of resistance R6 is connect with the output end of instrumentation amplifier U1, and the other end of the resistance R6 is grounded by resistance R8, described
One end of capacitor C1 is connect with the connecting pin of resistance R6 and resistance R8, the other end ground connection of the capacitor C1；It is described relatively to export
Circuit includes that the non-inverting input terminal of comparator U2 and resistance R11, the comparator U2 and the connecting pin of resistance R5 and resistance R7 connect
It connects, the inverting input terminal of the comparator U2 is connect with the connecting pin of resistance R6 and resistance R8, the output end of the comparator U2
To compare the output end OUT of output circuit and being connect by resistance R11 with the output end VCC of external power supply power supply.
Above-mentioned voltage jump detection circuit, it is characterised in that: the model AD623 of the instrumentation amplifier U1.
Above-mentioned voltage jump detection circuit, it is characterised in that: the model 1N5222 of the zener diode D1.
Above-mentioned voltage jump detection circuit, it is characterised in that: the model LM2903 of the comparator U2.
The present invention also provides a kind of designs rationally, it is convenient to realize, can fast and effeciently detect the case where voltage jump,
Voltage jump practical, with good application value carries out detection method, which is characterized in that this method include with
Lower step:
Step 1: detection circuit connects: will need to detect at the sample point anode and voltage signal of the circuit of voltage jump
The sample point cathode voltage input terminal VIN+ connection for managing circuit will need to detect the sample point cathode and electricity of the circuit of voltage jump
Press the sample point cathode voltage input terminal VIN- connection of signal processing circuit；
Step 2: voltage signal is handled: needing to detect in the circuit course of work of voltage jump, voltage signal processing circuit
Processing is amplified to the double-width grinding differential signal of the sample point positive electrode and negative electrode voltage for the circuit for needing to detect voltage jump
Afterwards, it is converted into single-ended voltage signal and exports to delay circuit to split-phase；
Step 3: voltage jump judges: when the circuit for needing to detect voltage jump works normally, that is, needing to detect voltage
Voltage between the sample point positive electrode and negative electrode of the circuit of mutation does not mutate, and the voltage of voltage signal processing circuit output is
One stabilization input voltage proportional to the differential input voltage of the instrumentation amplifier U1, voltage signal processing circuit output
Voltage be divided into two-way, all the way by the split-phase delay the first proportion resistor network in circuit divide after be output to it is more defeated
Out in circuit comparator U2 non-inverting input terminal, another way delays the second proportion resistor network in circuit point by the split-phase
The inverting input terminal for comparing comparator U2 in output circuit is output to after pressure, due to the resistance value of resistance R5, the resistance value of resistance R6, electricity
The resistance value of the resistance value and resistance R8 that hinder R7 meets relational expressionTherefore the non-inverting input terminal of comparator U2
Voltage is less than the voltage of its inverting input terminal, and comparator U2 exports low level, at this point, being judged as the voltage signal processing circuit
Input do not mutate；
When disjunction failure occurs in the circuit for needing to detect voltage jump, need to detect the sample point of the circuit of voltage jump
Voltage between positive electrode and negative electrode mutates, and the voltage of voltage signal processing circuit output is also the voltage letter of a mutation
Number, the voltage of voltage signal processing circuit output is divided into two-way, delays the first ratio in circuit electric by the split-phase all the way
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit after resistance network partial pressure, another way delays electricity by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit after the second proportion resistor network partial pressure in road, although resistance
The resistance value of R5, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionBut
The variation of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1, so that the same phase of comparator U2
The voltage of input terminal is greater than the voltage of its inverting input terminal, and comparator U2 exports high level, at this point, being judged as the voltage signal
The input voltage of processing circuit is mutated.
Compared with the prior art, the present invention has the following advantages:
1, the circuit structure of voltage jump detection circuit of the present invention is simple, and rationally, it is convenient and at low cost to realize for design.
2, compared with prior art, voltage jump detection circuit of the invention, not only without being programmed design, but also be not necessarily into
The complicated circuit parameter of row selects design, being capable of inductance disjunction occurs in reliable detection circuit voltage jump.
3, voltage jump detection circuit of the invention delays the parameter of circuit by changing split-phase, can be realized to voltage
It is mutated the detection of wide scope, it is applied widely.
4, voltage jump detection circuit of the invention, by selecting suitable instrumentation amplifier, it will be able to in circuit
Voltage is sampled, and interferes smaller, readily available more accurate voltage jump testing result to the circuit sampled itself.
5, voltage jump detection circuit of the invention, the instrumentation amplifier and comparator response speed of selection are very fast, energy
Enough detect that the voltage jump situation of microsecond rank or more, real-time detection effect are obvious.
6, the method and step of voltage jump detection method of the present invention is simple, and rationally, it is convenient to realize for design.
7, the present invention can be suitable in the various circuits for needing to detect voltage jump, can cooperate corresponding protection electricity
Road, it is applied widely, it is practical, there is good application value.
In conclusion circuit structure of the present invention is simple, rationally, it is convenient and at low cost to realize for design, can be quickly and efficiently
The case where detecting voltage jump, it is practical, it is applied widely, there is good application value.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of voltage jump detection circuit of the present invention.
Fig. 2 is the circuit diagram of voltage jump detection circuit of the present invention.
Fig. 3 is the method flow block diagram of voltage jump detection method of the present invention.
Fig. 4 is the circuit theory being applied to the circuit of voltage jump detection circuit of the invention and method in inductive circuit
Figure.
Description of symbols:
1-voltage signal processing circuit；2-split-phases delay circuit；3-compare output circuit；
4-inductive circuits.
Specific embodiment
As shown in Figure 1, voltage jump detection circuit of the invention, including sequentially connected voltage signal processing circuit 1, point
Mutually delay circuit 2 and compare output circuit 3, as shown in Fig. 2, the voltage signal processing circuit 1 includes instrumentation amplifier U1, electricity
The one end for hindering R1, resistance R2, resistance R3, resistance R4, resistance R10 and zener diode D1, the resistance R1 is at voltage signal
The one end for managing sample point cathode voltage the input terminal VIN-, the resistance R3 of circuit 1 is the sample point of voltage signal processing circuit 1
Cathode voltage input terminal VIN+, sample point cathode voltage are connected by concatenated resistance R1 with the resistance R2 resistor voltage divider network constituted
To ground, the connecting pin of the resistance R1 and resistance R2 are connect with the inverting input terminal of instrumentation amplifier U1, sample point cathode voltage
Ground is connected to by the resistor voltage divider network that concatenated resistance R3 and resistance R4 are constituted, the connecting pin of the resistance R3 and resistance R4 with
The non-inverting input terminal of instrumentation amplifier U1 connects, and is connected to gain between two gain resistor connecting pins of the instrumentation amplifier U1
Resistance RG is adjusted, the plus earth of the zener diode D1, the cathode of the zener diode D1 is with instrumentation amplifier U1's
The connection of Voltage Reference end, the Voltage Reference end of the instrumentation amplifier U1 also passes through the output of resistance R10 Yu external power supply power supply
Hold VCC connection；The split-phase delays circuit 2 including capacitor C1, the first proportion resistor network being made of resistance R5 and resistance R7,
And the second proportion resistor network being made of resistance R6 and resistance R8；Resistance value, the resistance value of resistance R6, resistance of the resistance R5
The resistance value of R7 and the resistance value of resistance R8 meet relational expressionOne end of the resistance R5 and instrumentation amplifier
The output end of U1 connects, and the other end of the resistance R5 is grounded by resistance R7, one end of the resistance R6 and instrumentation amplifier
The output end of U1 connects, and the other end of the resistance R6 is grounded by resistance R8, one end of the capacitor C1 and resistance R6 and electricity
Hinder the connecting pin connection of R8, the other end ground connection of the capacitor C1；The relatively output circuit 3 includes comparator U2 and resistance
The non-inverting input terminal of R11, the comparator U2 are connect with the connecting pin of resistance R5 and resistance R7, and the reverse phase of the comparator U2 is defeated
Enter end to connect with the connecting pin of resistance R6 and resistance R8, the output end of the comparator U2 is the output end for comparing output circuit 3
It OUT and is connect with the output end VCC of external power supply power supply by resistance R11.When it is implemented, the electricity of the instrumentation amplifier U1
Source is connect with the output end VCC of external power supply power supply, the ground terminal ground connection of the instrumentation amplifier U1；The comparator U2's
Power end is connect with the output end VCC of external power supply power supply, the ground terminal ground connection of the comparator U2.The external power supply power supply
Output end VCC output voltage be 5V.
In the present embodiment, as shown in Fig. 2, the model AD623 of the instrumentation amplifier U1.The instrument of model AD623 is used
The pin 2 of amplifier U1 is inverting input terminal, and pin 3 is non-inverting input terminal, and pin 1 is that two gain resistors connect with pin 8
End, pin 5 are Voltage Reference end, and pin 4 is ground terminal, and pin 7 is power end, and pin 6 is output end.
In the present embodiment, the model 1N5222 of the zener diode D1.
In the present embodiment, the model LM2903 of the comparator U2.
As shown in figure 3, voltage jump detection method of the invention, comprising the following steps:
Step 1: detection circuit connects: will need to detect at the sample point anode and voltage signal of the circuit of voltage jump
The sample point cathode voltage input terminal VIN+ connection for managing circuit 1, will need to detect the sampling of the circuit of inductance disjunction voltage jump
Point cathode is connect with the sample point cathode voltage input terminal VIN- of voltage signal processing circuit 1；
Step 2: voltage signal is handled: needing to detect in the circuit course of work of voltage jump, voltage signal processing circuit
The double-width grinding differential signal of the sample point positive electrode and negative electrode voltage of 1 pair of circuit for needing to detect voltage jump amplifies processing
Afterwards, it is converted into single-ended voltage signal and exports to delay circuit 2 to split-phase；
Step 3: voltage jump judges: when the circuit for needing to detect voltage jump works normally, that is, needing to detect voltage
Voltage between the sample point positive electrode and negative electrode of the circuit of mutation does not mutate, the voltage that voltage signal processing circuit 1 exports
It is a stabilization input voltage proportional to the differential input voltage of the instrumentation amplifier U1, voltage signal processing circuit 1
The voltage of output is divided into two-way, is output to after the split-phase delays the first proportion resistor network in circuit 2 to divide all the way
Compare the non-inverting input terminal of comparator U2 in output circuit 3, another way delays the second ratio in circuit 2 electric by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 3 after resistance network partial pressure, due to the resistance value of resistance R5, resistance R6
Resistance value, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionTherefore comparator U2's is same
The voltage of phase input terminal is less than the voltage of its inverting input terminal, and comparator U2 exports low level, at this point, being judged as the voltage letter
The input of number processing circuit 1 does not mutate；
When disjunction failure occurs in the circuit for needing to detect voltage jump, need to detect the sample point of the circuit of voltage jump
Voltage between positive electrode and negative electrode mutates, and the voltage that voltage signal processing circuit 1 exports is also the voltage letter of a mutation
Number, the voltage that voltage signal processing circuit 1 exports is divided into two-way, delays the first ratio in circuit 2 by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit 3 is output to after resistor network partial pressure, another way is prolonged by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 3 after the second proportion resistor network partial pressure in slow circuit 2, though
So the resistance value, the resistance value of resistance R6, the resistance value of resistance R7 of resistance R5 and the resistance value of resistance R8 meet relational expressionBut the change of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1
Change, so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal, comparator U2 exports high level, this
When, it is judged as that the input voltage of the voltage signal processing circuit 1 is mutated.
By the above detection method step can be seen that according to the output state of comparator U2 variation just can determine it is described
The input voltage mutation situation of voltage signal processing circuit 1.
For example, as shown in figure 4, voltage jump detection circuit of the invention and method to be applied to the voltage of inductive circuit 4
In abrupt climatic change, that is, the circuit for needing to detect voltage jump is inductive circuit 4, and the inductive circuit 4 is by DC voltage source Vi, electricity
Feel L1 and current-limiting resistance R0 concatenation to constitute, by the connecting line of the inductance L1 and current-limiting resistance R0 close to one end of connection inductance L1
A point A be set to the sample point cathode of the inductive circuit 4, by the connecting line of the inductance L1 and current-limiting resistance R0 close to connection
The one point B of one end of current-limiting resistance R0 is set to the sample point anode of the inductive circuit 4, and by the sampling of the inductive circuit 4
Point cathode is connect with the sample point cathode voltage input terminal VIN- of voltage signal processing circuit 1, by the sampling of the inductive circuit 4
Point anode is connect with the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit 1；The voltage jump detection circuit
In, resistance R10 is used for current limliting；In order to reduce influence of the resistor voltage divider network to the inductive circuit 4, resistance R1, resistance are chosen
The resistance value of R2, resistance R3 and resistance R4 are much larger than the resistance value of current-limiting resistance R0.
When the inductive circuit 4 works normally, the inductive circuit 4 tends to stable state, the voltage of this time point A is equal to point B
Voltage, comparator U2 export low level, at this point, being judged as that the input voltage of the voltage signal processing circuit 1 is not dashed forward
Become；
When the inductive circuit 4 since disjunction failure causes the connecting line of the inductance L1 and current-limiting resistance R0 from positioned at point
When point C between A and point B is disconnected, due to the presence of inductance L1, the loop current of the inductive circuit 4 will not be mutated, it will
Biggish induced voltage is generated at point C, the voltage of this time point A is much larger than the voltage of point B, and comparator U2 exports high level, at this point,
It is judged as that the input voltage of the voltage signal processing circuit 1 is mutated.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (3)
1. a kind of voltage jump detection circuit, it is characterised in that: including sequentially connected voltage signal processing circuit (1), split-phase
Delay circuit (2) and compare output circuit (3), the voltage signal processing circuit (1) include instrumentation amplifier U1, resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R10 and zener diode D1, the resistance R1 one end be voltage signal processing circuit
(1) one end of sample point cathode voltage input terminal VIN-, the resistance R3 be voltage signal processing circuit (1) sample point just
Pole tension input terminal VIN+, sample point cathode voltage are connected to by the resistor voltage divider network that concatenated resistance R1 and resistance R2 are constituted
The connecting pin of ground, the resistance R1 and resistance R2 are connect with the inverting input terminal of instrumentation amplifier U1, sample point cathode voltage by
The resistor voltage divider network that concatenated resistance R3 and resistance R4 is constituted is connected to ground, connecting pin and the instrument of the resistance R3 and resistance R4
It is connected with the non-inverting input terminal of amplifier U1, is connected to gain tune between two gain resistor connecting pins of the instrumentation amplifier U1
Economize on electricity resistance RG, the plus earth of the zener diode D1, the cathode of the zener diode D1 and the electricity of instrumentation amplifier U1
Reference end connection is pressed, the Voltage Reference end of the instrumentation amplifier U1 also passes through the output end of resistance R10 Yu external power supply power supply
VCC connection；It includes capacitor C1 that the split-phase, which delays circuit (2), the first proportion resistor network being made of resistance R5 and resistance R7,
And the second proportion resistor network being made of resistance R6 and resistance R8；Resistance value, the resistance value of resistance R6, resistance of the resistance R5
The resistance value of R7 and the resistance value of resistance R8 meet relational expressionOne end of the resistance R5 and instrumentation amplifier
The output end of U1 connects, and the other end of the resistance R5 is grounded by resistance R7, one end of the resistance R6 and instrumentation amplifier
The output end of U1 connects, and the other end of the resistance R6 is grounded by resistance R8, one end of the capacitor C1 and resistance R6 and electricity
Hinder the connecting pin connection of R8, the other end ground connection of the capacitor C1；Relatively output circuit (3) include comparator U2 and resistance
The non-inverting input terminal of R11, the comparator U2 are connect with the connecting pin of resistance R5 and resistance R7, and the reverse phase of the comparator U2 is defeated
Enter end to connect with the connecting pin of resistance R6 and resistance R8, the output end of the comparator U2 is the output for comparing output circuit (3)
It holds OUT and is connect by resistance R11 with the output end VCC of external power supply power supply；
The model AD623 of the instrumentation amplifier U1；The model 1N5222 of the zener diode D1.
2. voltage jump detection circuit described in accordance with the claim 1, it is characterised in that: the model of the comparator U2
LM2903。
3. a kind of method detected using detection circuit as described in claim 1 to voltage jump, which is characterized in that should
Method the following steps are included:
Step 1: detection circuit connects: will need to detect the sample point anode and voltage signal processing electricity of the circuit of voltage jump
The sample point cathode voltage input terminal VIN+ connection on road (1) will need to detect the sample point cathode and electricity of the circuit of voltage jump
Press the sample point cathode voltage input terminal VIN- connection of signal processing circuit (1)；
Step 2: voltage signal is handled: needing to detect in the circuit course of work of voltage jump, voltage signal processing circuit (1)
Processing is amplified to the double-width grinding differential signal of the sample point positive electrode and negative electrode voltage for the circuit for needing to detect voltage jump
Afterwards, it is converted into single-ended voltage signal and exports to delay circuit (2) to split-phase；
Step 3: voltage jump judges: when the circuit for needing to detect voltage jump works normally, that is, needing to detect voltage jump
Circuit sample point positive electrode and negative electrode between voltage do not mutate, voltage signal processing circuit (1) output voltage be
One stabilization input voltage proportional to the differential input voltage of the instrumentation amplifier U1, voltage signal processing circuit (1)
The voltage of output is divided into two-way, exports after the split-phase delays the first proportion resistor network in circuit (2) to divide all the way
To the non-inverting input terminal for comparing comparator U2 in output circuit (3), another way delays second in circuit (2) by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit (3) after proportion resistor network partial pressure, due to the resistance of resistance R5
Value, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionTherefore compare
The voltage of the non-inverting input terminal of device U2 is less than the voltage of its inverting input terminal, and comparator U2 exports low level, at this point, being judged as institute
The input for stating voltage signal processing circuit (1) does not mutate；
When disjunction failure occurs in the circuit for needing to detect voltage jump, need to detect the sample point anode of the circuit of voltage jump
Voltage between cathode mutates, and the voltage of voltage signal processing circuit (1) output is also the voltage signal of a mutation,
The voltage of voltage signal processing circuit (1) output is divided into two-way, delays the first ratio in circuit (2) by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit (3) is output to after resistor network partial pressure, another way passes through the split-phase
Be output to after delaying the second proportion resistor network in circuit (2) to divide compare comparator U2 in output circuit (3) reverse phase it is defeated
Enter end, although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionBut the change of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1
Change, so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal, comparator U2 exports high level, this
When, it is judged as that the input voltage of the voltage signal processing circuit (1) is mutated.
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| CN106680575A (en) | 2017-05-17 |
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