CN108333506A - A kind of nearly zero-signal extraction and alternating-current switch position detecting circuit - Google Patents
A kind of nearly zero-signal extraction and alternating-current switch position detecting circuit Download PDFInfo
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- CN108333506A CN108333506A CN201810305884.XA CN201810305884A CN108333506A CN 108333506 A CN108333506 A CN 108333506A CN 201810305884 A CN201810305884 A CN 201810305884A CN 108333506 A CN108333506 A CN 108333506A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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Abstract
The invention discloses a kind of nearly zero-signal extractions and alternating-current switch position detecting circuit, it is characterised in that：Including first order waveform processing circuit, peak extraction circuit, filter circuit, return difference circuit and second level waveform processing circuit, the Waveform Input at alternating-current switch both ends is connect with 1 foot of first order waveform processing circuit, 2 feet of first order waveform processing circuit and 1 foot of filter circuit, 1 foot of peak extraction circuit connects, 3 feet of peak extraction circuit and 2 feet of peak extraction circuit, 1 foot of return difference circuit connects, 2 feet of filter circuit are connect with 1 foot of second level waveform processing circuit, 2 feet of return difference circuit are connect with 2 feet of second level waveform processing circuit, 3 foot signal output waveforms of second level waveform processing circuit.The present invention detects nearly zero-signal and the position of the switch simultaneously, can filter out the interference signals such as harmonic wave, adaptive to the DC component of switch ends, extracts clear accurately nearly zero burst pulse.
Description
Technical field
Technical problem to be solved by the invention is to provide a kind of detection circuit, especially a kind of nearly zero-signal extraction and friendship
Flow position of the switch detection circuit.
Background technology
With the progress of the development and Industry Control of society, in mesolow field, there are two types of modes for switching power capacitor：
When not operating passing zero, second is that operating passing zero.Since there are inrush phenomenons, big, separating brake arcing does not generate overvoltage to operating passing zero,
To fling-cut switch, capacitor and around other electrical equipments have an adverse effect；And voltage zero-cross input, current over-zero is used to cut
It removes and carrys out switching power capacitor mode because inrush phenomenon is small, separating brake is accepted without restriking by everybody extensively, this is realized in middle pressure field
The switch of technology has high-voltage thyristor valve group switch, nearly zero switching AC vacuum circuit-breaker.High-voltage thyristor valve group is switched because of body
Product is big, cost is high, poor reliability, and practice is less.
The nearly zero switching AC vacuum circuit-breaker of shunt capacitor is traditional vacuum switching tube, operating mechanism and modern microelectronic
The product that technology combines is aided with high-precision sampling circuit and rational programming realization is highly reliable using microcontroller as core
Nearly zero fling-cut switch of property.But the judgement in the case where mains by harmonics is big, switch ends have capacitor residual voltage to nearly zero-signal
It will appear error.
Invention content
Technical problem to be solved by the invention is to provide a kind of nearly zero-signal extraction and alternating-current switch position detecting circuit,
It detects nearly zero-signal and the position of the switch simultaneously, can filter out the interference signals such as harmonic wave, adaptive to the DC component of switch ends,
Extract clear accurately nearly zero burst pulse.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of nearly zero-signal extraction and alternating-current switch position detecting circuit, it is characterised in that：Including first order waveform processing circuit,
Peak extraction circuit, filter circuit, return difference circuit and second level waveform processing circuit, the Waveform Input at alternating-current switch both ends and
1 foot of level-one waveform processing circuit connects, 2 feet of first order waveform processing circuit and 1 foot of filter circuit, peak extraction circuit
The connection of 1 foot, 3 feet of peak extraction circuit connect with 1 foot of 2 feet of peak extraction circuit, return difference circuit, the 2 of filter circuit
Foot is connect with 1 foot of second level waveform processing circuit, and 2 feet of return difference circuit are connect with 2 feet of second level waveform processing circuit, the
3 foot signal output waveforms of two level waveform processing circuit.
Further, the first order waveform processing circuit includes bridge heap B1 and isolating chip Q1, and 1 foot of bridge heap B1 connects
The one end resistance R1, one end of the 2 feet connection resistance R2 of bridge heap B1, the other end of resistance R1 are exchanged with the connection of the other end of resistance R2
Open the light both ends Waveform Input, and 3 feet of bridge heap B1 are connect with the A feet of isolating chip Q1, the K of 4 feet and isolating chip Q1 of bridge heap B1
Foot connects, and C feet connection one end resistance R3 of isolating chip Q1 simultaneously exports unidirectional waveform MC1, and the resistance R3 other ends connect power supply
The E feet connection common ground VSS of VCC, isolating chip Q1.
Further, the first order waveform processing circuit include isolating chip Q1, Q2, the A feet of isolating chip Q1 and every
The K feet of off-chip piece Q2 are connect with the one end resistance R1, and the K feet of isolating chip Q1 and the A feet of isolating chip Q2 connect with the one end resistance R2
It connects, the other end of resistance R1 exchanges the both ends Waveform Input that opens the light, the C feet of isolating chip Q1, Q2 with the connection of the other end of resistance R2
Connection one end resistance R3 simultaneously exports unidirectional waveform MC1, and the resistance R3 other ends connect power supply VCC, and the E feet of isolating chip Q1, Q2 connect
Meet common ground VSS.
Further, the first order waveform processing circuit includes isolating chip Q1, and the A feet of isolating chip Q1 connect resistance
The one end R1, one end K feet connection resistance R2 of isolating chip Q1, the other end of resistance R1 exchange out with the connection of the other end of resistance R2
Light both ends Waveform Input, C feet connection one end resistance R3 of isolating chip Q1 simultaneously export unidirectional waveform MC1, and the resistance R3 other ends connect
Meet power supply VCC, the E feet connection common ground VSS of isolating chip Q1.
Further, the peak extraction circuit includes amplifier U1A and amplifier U1B, the 3 foot conducts of amplifier U1A
2 feet of peak extraction circuit input end and 5 feet for connecting amplifier U1B, amplifier U1A connect 7 feet and the conduct of amplifier U1B
Peak extraction circuit output end, while peak extraction circuit output end forms feedback to 2 feet of amplifier U1A, amplifier U1A's
1 foot connects diode D2 anodes, and diode D2 cathodes connect 6 feet of the one end capacitance C1 and amplifier U1B, the other end of capacitance C1
Connect common ground VSS.
Further, the filter circuit includes resistance R4 and capacitance C2, the one end resistance R4 as filter circuit input terminal,
The resistance R4 other ends connect with one end of capacitance C2 and as filter circuit output ends, and the capacitance C2 other ends connect common ground
VSS。
Further, the filter circuit includes amplifier U2A, 3 feet and the one end resistance R5 and the capacitance C3 of amplifier U2A
One end connects, and the resistance R5 other ends connect common ground VSS, amplifier as filter circuit input terminal, the other end of capacitance C3
2 feet connection one end resistance R6 of U2A and the one end capacitance C4, the resistance R6 other ends connect the 1 of amplifier U2A with the capacitance C4 other ends
Foot and as filter circuit output end.
Further, the return difference circuit includes amplifier U3A, one end 2 feet connection resistance R8 of amplifier U3A, resistance
The R8 other ends connect the one end resistance R7 and the one end capacitance C5, and for the resistance R7 other ends as return difference circuit input end, capacitance C5 is another
8,4 feet of end ground connection, amplifier U3A are separately connected ± 5V power supplys, one end 3 feet connection resistance R9 of amplifier U3A, resistance R10
One end and the one end resistance R11, resistance R9 other ends ground connection, the resistance R10 other ends connect the one end capacitance C6, and the capacitance C6 other ends connect
The connecting resistance R11 other ends, 1 foot of amplifier U3A and as return difference circuit output end.
Further, the second level waveform processing circuit includes amplifier U4A, and 2 feet of amplifier U4A connect resistance
The other end of the one end R12 and the one end resistance R14, one end 3 feet connection resistance R13 of amplifier U4A, resistance R12 and resistance R13 are made
For the two-way input terminal of second level waveform processing circuit, the resistance R14 other ends connect 1 foot of amplifier U4A and as the second level
The output end of waveform processing circuit.
Compared with prior art, the present invention haing the following advantages and effect：The present invention detects nearly zero-signal and switch simultaneously
Position can filter out the interference signals such as harmonic wave, adaptive to the DC component of switch ends, extract clear accurately nearly zero narrow arteries and veins
Punching, stronger, close zero error smaller, reliability higher using nearly zero switching AC vacuum circuit-breaker adaptability of this circuit.
Description of the drawings
Fig. 1 is the schematic diagram of a kind of nearly the zero-signal extraction and alternating-current switch position detecting circuit of the present invention.
Fig. 2 is the schematic diagram of the embodiment 1 of the first order waveform processing circuit of the present invention.
Fig. 3 is the schematic diagram of the embodiment 2 of the first order waveform processing circuit of the present invention.
Fig. 4 is the schematic diagram of the embodiment 3 of the first order waveform processing circuit of the present invention.
Fig. 5 is the schematic diagram of the peak extraction circuit of the present invention.
Fig. 6 is the schematic diagram of the embodiment 1 of the filter circuit of the present invention.
Fig. 7 is the schematic diagram of the embodiment 2 of the filter circuit of the present invention.
Fig. 8 is the schematic diagram of the return difference circuit of the present invention.
Fig. 9 is the schematic diagram of the second level waveform processing circuit of the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited in following embodiments.
Embodiment 1：
As shown in Figure 1, a kind of nearly zero-signal extraction of the present invention at alternating-current switch position detecting circuit, including first order waveform
Circuit 1, peak extraction circuit 2, filter circuit 3, return difference circuit 4 and second level waveform processing circuit 5 are managed, alternating-current switch both ends
Waveform Input is connect with 1 foot of first order waveform processing circuit 1,2 feet of first order waveform processing circuit 1 and the 1 of filter circuit 3
The 1 of the 1 foot connection of foot, peak extraction circuit 2,3 feet of peak extraction circuit 2 and 2 feet of peak extraction circuit 2, return difference circuit 4
Foot connects, and 2 feet of filter circuit 3 are connect with 1 foot of second level waveform processing circuit 5,2 feet and the second level wave of return difference circuit 4
2 feet of shape processing circuit 5 connect, 3 foot signal output waveforms of second level waveform processing circuit 5.
The operation principle of the present invention：The bidirectional waveform of exchange is treated as unidirectional wave by first order waveform processing circuit 1
Shape.Peak extraction circuit 2 proposes the waveform exported from first order waveform processing circuit 1 to obtain the direct current with peak value equal proportion
It is flat.The waveform that filter circuit 3 exports first order waveform processing circuit 1, filters out high fdrequency component.Return difference circuit 4 is by peak extraction
The DC voltage that circuit 2 exports carries out return difference processing.Second level waveform processing circuit 5 is by the two of filter circuit 3 and return difference circuit 4
A input signal is compared, and obtains nearly zero square-wave pulse signal.
As shown in Fig. 2, it includes bridge heap B1 and isolating chip that B1 chips, which use bridge heap LT06, first order waveform processing circuit,
One end 1 foot connection resistance R1 of Q1, bridge heap B1, one end of the 2 feet connection resistance R2 of bridge heap B1, the other end and resistance of resistance R1
The other end connection of R2 exchanges the both ends Waveform Input that opens the light, and 3 feet of bridge heap B1 are connect with the A feet of isolating chip Q1, and the 4 of bridge heap B1
Foot is connect with the K feet of isolating chip Q1, and C feet connection one end resistance R3 of isolating chip Q1 simultaneously exports unidirectional waveform MC1, resistance R3
The other end connects power supply VCC, the E feet connection common ground VSS of isolating chip Q1.
As shown in figure 5, peak extraction circuit includes amplifier U1A and amplifier U1B, 3 feet of amplifier U1A are as peak value
2 feet of extraction circuit input end and 5 feet for connecting amplifier U1B, amplifier U1A connect 7 feet of amplifier U1B and as peak value
Circuit output end is extracted, while peak extraction circuit output end forms feedback, 1 foot of amplifier U1A to 2 feet of amplifier U1A
Diode D2 anodes are connected, diode D2 cathodes connect 6 feet of the one end capacitance C1 and amplifier U1B, and the other end of capacitance C1 connects
Meet common ground VSS.
As shown in fig. 6, filter circuit includes resistance R4 and capacitance C2, the one end resistance R4 is as filter circuit input terminal, electricity
The resistance R4 other ends connect with one end of capacitance C2 and as filter circuit output ends, and the capacitance C2 other ends connect common ground VSS.
As shown in figure 8, return difference circuit includes amplifier U3A, 2 feet of amplifier U3A connect the one end resistance R8, and resistance R8 is another
One end connects the one end resistance R7 and the one end capacitance C5, and the resistance R7 other ends are as return difference circuit input end, another terminations of capacitance C5
8,4 feet on ground, amplifier U3A are separately connected ± 5V power supplys, the one end 3 feet connection resistance R9, the one end resistance R10 of amplifier U3A
With the one end resistance R11, resistance R9 other ends ground connection, the resistance R10 other ends connect the one end capacitance C6, capacitance C6 other ends connection electricity
Hinder the R11 other ends, 1 foot of amplifier U3A and as return difference circuit output end.
As shown in figure 9, second level waveform processing circuit includes amplifier U4A, the 2 feet connection resistance R12 mono- of amplifier U4A
The other end of end and the one end resistance R14,3 feet connection resistance R13 one end of amplifier U4A, resistance R12 and resistance R13 are as the
The two-way input terminal of two level waveform processing circuit, the resistance R14 other ends connect 1 foot of amplifier U4A and as second level waveforms
The output end of processing circuit.
Embodiment 2：
As shown in Figure 1, a kind of nearly zero-signal extraction of the present invention at alternating-current switch position detecting circuit, including first order waveform
Circuit 1, peak extraction circuit 2, filter circuit 3, return difference circuit 4 and second level waveform processing circuit 5 are managed, alternating-current switch both ends
Waveform Input is connect with 1 foot of first order waveform processing circuit 1,2 feet of first order waveform processing circuit 1 and the 1 of filter circuit 3
The 1 of the 1 foot connection of foot, peak extraction circuit 2,3 feet of peak extraction circuit 2 and 2 feet of peak extraction circuit 2, return difference circuit 4
Foot connects, and 2 feet of filter circuit 3 are connect with 1 foot of second level waveform processing circuit 5,2 feet and the second level wave of return difference circuit 4
2 feet of shape processing circuit 5 connect, 3 foot signal output waveforms of second level waveform processing circuit 5.
The operation principle of the present invention：The bidirectional waveform of exchange is treated as unidirectional wave by first order waveform processing circuit 1
Shape.Peak extraction circuit 2 proposes the waveform exported from first order waveform processing circuit 1 to obtain the direct current with peak value equal proportion
It is flat.The waveform that filter circuit 3 exports first order waveform processing circuit 1, filters out high fdrequency component.Return difference circuit 4 is by peak extraction
The DC voltage that circuit 2 exports carries out return difference processing.Second level waveform processing circuit 5 is by the two of filter circuit 3 and return difference circuit 4
A input signal is compared, and obtains nearly zero square-wave pulse signal.
As shown in figure 3, first order waveform processing circuit includes isolating chip Q1, Q2, the A feet and isolated core of isolating chip Q1
The K feet of piece Q2 are connect with the one end resistance R1, and the K feet of isolating chip Q1 and the A feet of isolating chip Q2 are connect with the one end resistance R2, electricity
It hinders the other end of R1 and the connection of the other end of resistance R2 exchanges the both ends Waveform Input that opens the light, the C feet connection electricity of isolating chip Q1, Q2
Resistance one end R3 simultaneously exports unidirectional waveform MC1, and the resistance R3 other ends connect power supply VCC, and the E feet connection of isolating chip Q1, Q2 are public
It is grounded VSS.
As shown in figure 5, peak extraction circuit includes amplifier U1A and amplifier U1B, 3 feet of amplifier U1A are as peak value
2 feet of extraction circuit input end and 5 feet for connecting amplifier U1B, amplifier U1A connect 7 feet of amplifier U1B and as peak value
Circuit output end is extracted, while peak extraction circuit output end forms feedback, 1 foot of amplifier U1A to 2 feet of amplifier U1A
Diode D2 anodes are connected, diode D2 cathodes connect 6 feet of the one end capacitance C1 and amplifier U1B, and the other end of capacitance C1 connects
Meet common ground VSS.
As shown in fig. 6, filter circuit includes resistance R4 and capacitance C2, the one end resistance R4 is as filter circuit input terminal, electricity
The resistance R4 other ends connect with one end of capacitance C2 and as filter circuit output ends, and the capacitance C2 other ends connect common ground VSS.
As shown in figure 8, return difference circuit includes amplifier U3A, 2 feet of amplifier U3A connect the one end resistance R8, and resistance R8 is another
One end connects the one end resistance R7 and the one end capacitance C5, and the resistance R7 other ends are as return difference circuit input end, another terminations of capacitance C5
8,4 feet on ground, amplifier U3A are separately connected ± 5V power supplys, the one end 3 feet connection resistance R9, the one end resistance R10 of amplifier U3A
With the one end resistance R11, resistance R9 other ends ground connection, the resistance R10 other ends connect the one end capacitance C6, capacitance C6 other ends connection electricity
Hinder the R11 other ends, 1 foot of amplifier U3A and as return difference circuit output end.
As shown in figure 9, second level waveform processing circuit includes amplifier U4A, the 2 feet connection resistance R12 mono- of amplifier U4A
The other end of end and the one end resistance R14,3 feet connection resistance R13 one end of amplifier U4A, resistance R12 and resistance R13 are as the
The two-way input terminal of two level waveform processing circuit, the resistance R14 other ends connect 1 foot of amplifier U4A and as second level waveforms
The output end of processing circuit.
Embodiment 3：
As shown in Figure 1, a kind of nearly zero-signal extraction of the present invention at alternating-current switch position detecting circuit, including first order waveform
Circuit 1, peak extraction circuit 2, filter circuit 3, return difference circuit 4 and second level waveform processing circuit 5 are managed, alternating-current switch both ends
Waveform Input is connect with 1 foot of first order waveform processing circuit 1,2 feet of first order waveform processing circuit 1 and the 1 of filter circuit 3
The 1 of the 1 foot connection of foot, peak extraction circuit 2,3 feet of peak extraction circuit 2 and 2 feet of peak extraction circuit 2, return difference circuit 4
Foot connects, and 2 feet of filter circuit 3 are connect with 1 foot of second level waveform processing circuit 5,2 feet and the second level wave of return difference circuit 4
2 feet of shape processing circuit 5 connect, 3 foot signal output waveforms of second level waveform processing circuit 5.
The operation principle of the present invention：The bidirectional waveform of exchange is treated as unidirectional wave by first order waveform processing circuit 1
Shape.Peak extraction circuit 2 proposes the waveform exported from first order waveform processing circuit 1 to obtain the direct current with peak value equal proportion
It is flat.The waveform that filter circuit 3 exports first order waveform processing circuit 1, filters out high fdrequency component.Return difference circuit 4 is by peak extraction
The DC voltage that circuit 2 exports carries out return difference processing.Second level waveform processing circuit 5 is by the two of filter circuit 3 and return difference circuit 4
A input signal is compared, and obtains nearly zero square-wave pulse signal.
As shown in figure 4, first order waveform processing circuit includes isolating chip Q1, the A feet connection resistance R1 of isolating chip Q1
One end, one end K feet connection resistance R2 of isolating chip Q1, the other end of resistance R1 is exchanged with the connection of the other end of resistance R2 to open the light
Both ends Waveform Input, C feet connection one end resistance R3 of isolating chip Q1 simultaneously export unidirectional waveform MC1, the connection of the resistance R3 other ends
The E feet connection common ground VSS of power supply VCC, isolating chip Q1.
As shown in figure 5, peak extraction circuit includes amplifier U1A and amplifier U1B, 3 feet of amplifier U1A are as peak value
2 feet of extraction circuit input end and 5 feet for connecting amplifier U1B, amplifier U1A connect 7 feet of amplifier U1B and as peak value
Circuit output end is extracted, while peak extraction circuit output end forms feedback, 1 foot of amplifier U1A to 2 feet of amplifier U1A
Diode D2 anodes are connected, diode D2 cathodes connect 6 feet of the one end capacitance C1 and amplifier U1B, and the other end of capacitance C1 connects
Meet common ground VSS.
As shown in fig. 7, filter circuit includes amplifier U2A, 3 feet and the one end resistance R5 and the capacitance C3 mono- of amplifier U2A
End connection, the resistance R5 other ends connect common ground VSS, amplifier U2A as filter circuit input terminal, the other end of capacitance C3
2 feet connection the one end resistance R6 and the one end capacitance C4, the resistance R6 other ends 1 foot of amplifier U2A is connected with the capacitance C4 other ends
And as filter circuit output end.
As shown in figure 8, return difference circuit includes amplifier U3A, 2 feet of amplifier U3A connect the one end resistance R8, and resistance R8 is another
One end connects the one end resistance R7 and the one end capacitance C5, and the resistance R7 other ends are as return difference circuit input end, another terminations of capacitance C5
8,4 feet on ground, amplifier U3A are separately connected ± 5V power supplys, the one end 3 feet connection resistance R9, the one end resistance R10 of amplifier U3A
With the one end resistance R11, resistance R9 other ends ground connection, the resistance R10 other ends connect the one end capacitance C6, capacitance C6 other ends connection electricity
Hinder the R11 other ends, 1 foot of amplifier U3A and as return difference circuit output end.
As shown in figure 9, second level waveform processing circuit includes amplifier U4A, the 2 feet connection resistance R12 mono- of amplifier U4A
The other end of end and the one end resistance R14,3 feet connection resistance R13 one end of amplifier U4A, resistance R12 and resistance R13 are as the
The two-way input terminal of two level waveform processing circuit, the resistance R14 other ends connect 1 foot of amplifier U4A and as second level waveforms
The output end of processing circuit.
Described in this specification above content is only illustrations made for the present invention.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement to described specific embodiment or substitute by a similar method, only
The guarantor of the present invention should all be belonged to without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (9)
1. a kind of nearly zero-signal extraction and alternating-current switch position detecting circuit, it is characterised in that：Including first order waveform processing electricity
Road, peak extraction circuit, filter circuit, return difference circuit and second level waveform processing circuit, the Waveform Input at alternating-current switch both ends
It is connect with 1 foot of first order waveform processing circuit, 2 feet and 1 foot of filter circuit, peak extraction of first order waveform processing circuit
1 foot of circuit connects, and 3 feet of peak extraction circuit are connect with 1 foot of 2 feet of peak extraction circuit, return difference circuit, filter circuit
2 feet connect with 1 foot of second level waveform processing circuit, 2 feet of return difference circuit and 2 feet of second level waveform processing circuit connect
It connects, 3 foot signal output waveforms of second level waveform processing circuit.
2. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes bridge heap B1 and isolating chip Q1 to state first order waveform processing circuit, and 1 foot of bridge heap B1 connects the one end resistance R1, bridge heap B1's
2 feet connect one end of resistance R2, and the other end of resistance R1 connects alternating-current switch both ends Waveform Input, bridge with the other end of resistance R2
3 feet of heap B1 are connect with the A feet of isolating chip Q1, and 4 feet of bridge heap B1 are connect with the K feet of isolating chip Q1, the C of isolating chip Q1
Foot connects the one end resistance R3 and exports unidirectional waveform MC1, and the resistance R3 other ends connect power supply VCC, the E feet connection of isolating chip Q1
Common ground VSS.
3. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It states first order waveform processing circuit and includes isolating chip Q1, Q2, the A feet of isolating chip Q1 and the K feet and resistance of isolating chip Q2
The one end R1 connects, and the K feet of isolating chip Q1 and the A feet of isolating chip Q2 connect with the one end resistance R2, the other end of resistance R1 with
The other end connection of resistance R2 exchanges the both ends Waveform Input that opens the light, and C feet connection one end resistance R3 of isolating chip Q1, Q2 simultaneously export
Unidirectional waveform MC1, the resistance R3 other ends connect power supply VCC, the E feet connection common ground VSS of isolating chip Q1, Q2.
4. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes isolating chip Q1 to state first order waveform processing circuit, and the A feet of isolating chip Q1 connect the one end resistance R1, isolating chip Q1's
K feet connect the one end resistance R2, and the other end of resistance R1 exchanges the both ends Waveform Input that opens the light with the connection of the other end of resistance R2, is isolated
C feet connection one end resistance R3 of chip Q1 simultaneously exports unidirectional waveform MC1, and the resistance R3 other ends connect power supply VCC, isolating chip Q1
E feet connection common ground VSS.
5. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes amplifier U1A and amplifier U1B to state peak extraction circuit, 3 feet of amplifier U1A as peak extraction circuit input end simultaneously
Connect 5 feet of amplifier U1B, 7 feet of the 2 feet connection amplifier U1B of amplifier U1A and as peak extraction circuit output end,
Peak extraction circuit output end forms feedback, the 1 foot connection diode D2 sun of amplifier U1A to 2 feet of amplifier U1A simultaneously
Pole, diode D2 cathodes connect 6 feet of the one end capacitance C1 and amplifier U1B, the other end connection common ground VSS of capacitance C1.
6. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes resistance R4 and capacitance C2 to state filter circuit, and the one end resistance R4 is as filter circuit input terminal, the resistance R4 other ends and capacitance
One end of C2 connects and as filter circuit output end, and the capacitance C2 other ends connect common ground VSS.
7. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes amplifier U2A to state filter circuit, and 3 feet of amplifier U2A are connect with the one end resistance R5 and the one end capacitance C3, and resistance R5 is another
End is used as filter circuit input terminal, the other end of capacitance C3 to connect common ground VSS, the 2 feet connection resistance R6 mono- of amplifier U2A
End and the one end capacitance C4, the resistance R6 other ends connect 1 foot of amplifier U2A with the capacitance C4 other ends and are exported as filter circuit
End.
8. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes amplifier U3A, one end 2 feet connection resistance R8 of amplifier U3A, resistance R8 other ends connection resistance R7 mono- to state return difference circuit
End and the one end capacitance C5, the resistance R7 other ends are grounded as return difference circuit input end, the capacitance C5 other ends, and 8, the 4 of amplifier U3A
Foot is separately connected ± 5V power supplys, the one end 3 feet connection resistance R9, the one end resistance R10 and the one end resistance R11 of amplifier U3A, resistance
The R9 other ends are grounded, and the resistance R10 other ends connect the one end capacitance C6, and the capacitance C6 other ends connect the resistance R11 other ends, amplifier
1 foot of U3A and as return difference circuit output end.
9. a kind of nearly zero-signal extraction described in accordance with the claim 1 and alternating-current switch position detecting circuit, it is characterised in that：Institute
It includes amplifier U4A to state second level waveform processing circuit, and 2 feet of amplifier U4A connect the one end resistance R12 and the one end resistance R14,
The other end of one end 3 feet connection resistance R13 of amplifier U4A, resistance R12 and resistance R13 are as second level waveform processing circuit
Two-way input terminal, the resistance R14 other ends connect 1 foot of amplifier U4A and as the output ends of second level waveform processing circuit.
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| CN201810305884.XA CN108333506A (en) | 2018-04-08 | 2018-04-08 | A kind of nearly zero-signal extraction and alternating-current switch position detecting circuit |
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