CN106018935A - Phase-locked grid zero-crossing detection system based on sampling amplifier circuit - Google Patents
Phase-locked grid zero-crossing detection system based on sampling amplifier circuit Download PDFInfo
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- CN106018935A CN106018935A CN201610565902.9A CN201610565902A CN106018935A CN 106018935 A CN106018935 A CN 106018935A CN 201610565902 A CN201610565902 A CN 201610565902A CN 106018935 A CN106018935 A CN 106018935A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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Abstract
The invention discloses a phase-locked grid zero-crossing detection system based on a sampling amplifier circuit. The system is characterized by mainly comprising a detection chip U, a power circuit, a sampling circuit connected with the power circuit, and a sampling amplifier circuit connected with the sampling circuit. The system, which combines an SN74121N integrated chip and a peripheral circuit, has stronger anti-interference ability. Even if the grid fluctuates, the system can work stably and detect out the zero-crossing point of AC power on a power line accurately. Meanwhile, the system can amplify signals and lock the phase of voltage. Thus, signals can be better identified and processed, and the detection accuracy of the system is improved.
Description
Technical field
The present invention relates to a kind of detecting system, specifically refer to a kind of phase-locking type electrical network based on amplifier circuit
Zero-crossing detection system.
Background technology
Along with the fast development of intelligent grid, power carrier communication technology is also widely used.Electric power carries
Ripple mechanics of communication needs the zero crossing of alternating current on accurate detection electric lines of force when application, to guarantee its communication
Performance.On electric lines of force, the zero crossing of alternating current generally uses zero-crossing detection system to detect at present, but,
Existing zero-crossing detection system capacity of resisting disturbance is poor, and when fluctuation occurs in electrical network, skew easily occurs in signal,
Cause accuracy of detection poor, it is impossible to meet the demand of people.
Summary of the invention
It is an object of the invention to solve the defect that existing zero-crossing detection system capacity of resisting disturbance is poor, it is provided that
A kind of phase-locking type electrical network zero-crossing detection system based on amplifier circuit.
The purpose of the present invention is by following technical proposals reality: a kind of phase-locking type based on amplifier circuit electricity
Net zero-crossing detection system, mainly by detection chip U, power circuit, the sampling being connected with power circuit electricity
Road, the amplifier circuit being connected with sample circuit, negative pole is connected with the B pin of detection chip U,
The electric capacity C3 that positive pole is connected with amplifier circuit, positive pole is connected with the CEXT pin of detection chip U,
The VCC of the electric capacity C4 that negative pole is connected with the REXT pin of detection chip U, one end and detection chip U
The resistance R4 that pin is connected, the other end is connected with power circuit, is connected with the Q pin of detection chip U
The phase-locked loop circuit connect, and the inspection being connected with the GND pin of phase-locked loop circuit and detection chip U respectively
Survey output circuit forms；Described detection output circuit is also connected with power circuit.
Further, described phase-locked loop circuit, by amplifier P1, amplifier P2, audion VT5, is serially connected in
Resistance R9 between outfan and the positive pole of amplifier P1 of amplifier P2, is serially connected in the defeated of amplifier P2
Go out the resistance R10 between end and the negative pole of amplifier P1, be serially connected in negative pole and the audion VT5 of amplifier P1
Emitter stage between resistance R11, be serially connected between the positive pole of amplifier P1 and the colelctor electrode of audion VT5
Resistance R13, positive pole is connected with the positive pole of amplifier P1, negative pole is connected with the outfan of amplifier P1
The electric capacity C10 connect, positive pole is connected with the outfan of amplifier P1, negative pole after resistance R14 with audion
Electric capacity C11, the N pole that the base stage of VT5 is connected is connected with the positive pole of amplifier P2, P pole is through resistance R15
The diode D8 that negative pole with electric capacity C11 is connected afterwards, and be serially connected in the outfan of amplifier P2 and bear
Resistance R12 composition between pole；The outfan of described amplifier P2 as this phase-locked loop circuit input also
It is connected with the Q pin of detection chip U；The grounded emitter of described audion VT5；Described amplifier
The outfan of P1 as the outfan of this phase-locked loop circuit and is connected with detection output circuit.
Described amplifier circuit is by the base stage of audion VT3, audion VT4, negative pole and audion VT3
Be connected, positive pole is sent out with audion VT3's as the electric capacity C7 of the input of this amplifier circuit, one end
Emitter-base bandgap grading is connected, resistance R6, the N pole of other end ground connection is connected with the emitter stage of audion VT4, P pole
The diode D7 of ground connection, positive pole is connected with the emitter stage of audion VT4, the P of negative pole and diode D7
The electric capacity C8 that pole is connected, is serially connected in the resistance between the P pole of diode D7 and the base stage of audion VT3
R7, positive pole emitter stage with audion VT3 after resistance R8 is connected, negative pole is as this amplifier electricity
Electric capacity C9, the N pole of the outfan on road is connected with the positive pole of electric capacity C9, the collection of P pole and audion VT4
The diode D6 that electrode is connected, and N pole is connected with the positive pole of electric capacity C9, P pole and audion VT3
Colelctor electrode be connected diode D5 composition；The base stage of described audion VT4 and the collection of audion VT3
Electrode is connected；The input of described amplifier circuit is connected with sample circuit, its outfan then with electricity
The positive pole holding C3 is connected.
Described power circuit by transformator T, the non-same polarity phase of positive pole and the secondary inductance coil of transformator T
The electric capacity C1 composition that connection, negative pole are connected with the Same Name of Ends of the secondary inductance coil of transformator T；Described electricity
The positive pole holding C1 is all connected with sample circuit with negative pole.
Described sample circuit is connected with the negative pole of amplifier P by amplifier P, N pole, P pole is through resistance R2
Diode D3, the P pole that negative pole with amplifier P is connected afterwards is connected with the negative pole of amplifier P, N pole
Diode D2, the N pole being connected with the P pole of diode D3 is connected with the positive pole of amplifier P, P pole
The diode being connected with the negative pole of electric capacity C1 and the GND pin of detection chip U respectively after resistance R3
D1, the electric capacity C2 that positive pole is connected with the negative pole of amplifier P, negative pole is connected with the P pole of diode D3,
And the resistance R1 that one end is connected with the negative pole of amplifier P, the other end is connected with the positive pole of electric capacity C1
Composition；The outfan of described amplifier P is connected with the input of amplifier circuit；Described electric capacity C1's
Positive pole also after resistance R4 VCC pin with detection chip U be connected.
Described detection output circuit is by the output of audion VT1, audion VT2, positive pole and phase-locked loop circuit
The electric capacity C5 that end is connected, negative pole is connected with the base stage of audion VT1, one end is with audion VT1's
The resistance R5 that emitter stage is connected, the other end is connected with the GND pin of detection chip U, positive pole and three
Ground connection while the emitter stage of pole pipe VT2 is connected, negative pole is connected with the GND pin of detection chip U
Electric capacity C6, and N pole is connected with the positive pole of electric capacity C1, P pole is connected with the base stage of audion VT2
The diode D4 composition connect；The base stage of described audion VT2 is connected with the colelctor electrode of audion VT1,
Its colelctor electrode is connected with the N pole of diode D4, its emitter stage is as outfan.
Described detection chip U is the integrated chip of SN74121N.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) present invention uses the integrated chip of SN74121N to combine with peripheral circuit so that it is have higher
Capacity of resisting disturbance, even if remaining able to stable work in the case of fluctuation occurs in electrical network, detects accurately
Go out the zero crossing of alternating current on electric lines of force.
(2) signal can be amplified by the present invention, enable the invention to preferably signal to be identified,
Process, such that it is able to improve the accuracy of detection of the present invention.
(3) phase place of voltage can be locked by the present invention, it is to avoid voltage-phase fluctuates and affects the present invention
Zero passage detection precision.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the amplifier circuit of the present invention.
Fig. 3 is the structure chart of the phase-locked loop circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by detection chip U, power circuit, it is connected with power circuit
Sample circuit, the amplifier circuit being connected with sample circuit, the B pin phase of negative pole and detection chip U
The CEXT pin of the electric capacity C3 that connection, positive pole are connected with amplifier circuit, positive pole and detection chip U
Be connected, electric capacity C4 that negative pole is connected with the REXT pin of detection chip U, one end and detection chip U
The resistance R4 that VCC pin is connected, the other end is connected with power circuit, with the Q of detection chip U
The phase-locked loop circuit that pin is connected, and respectively with the GND pin phase of phase-locked loop circuit and detection chip U
The detection output circuit composition connected；Described detection output circuit is also connected with power circuit.In order to more preferably
The enforcement present invention, the integrated chip of the preferred SN74121N of described detection chip U realizes.
Wherein, described power circuit is by transformator T, and positive pole is non-same with the secondary inductance coil of transformator T
The name electric capacity C1 that end is connected, negative pole is connected with the Same Name of Ends of the secondary inductance coil of transformator T composition；
The positive pole of described electric capacity C1 is all connected with sample circuit with negative pole.
This described sample circuit is by amplifier P, resistance R1, resistance R2, resistance R3, electric capacity C2, two poles
Pipe D1, diode D2 and diode D3 form.
During connection, the N pole of diode D3 is connected with the negative pole of amplifier P, its P pole is after resistance R2
It is connected with the negative pole of amplifier P.The P pole of diode D2 is connected with the negative pole of amplifier P, its N
Pole is connected with the P pole of diode D3.The N pole of diode D1 is connected with the positive pole of amplifier P, it
P pole is connected with the negative pole of electric capacity C1 and the GND pin of detection chip U after resistance R3 respectively.Electricity
The positive pole of appearance C2 is connected with the negative pole of amplifier P, its negative pole is connected with the P pole of diode D3.Electricity
It is described that one end of resistance R1 is connected with the negative pole of amplifier P, its other end is connected with the positive pole of electric capacity C1
The positive pole of electric capacity C1 also after resistance R4 VCC pin with detection chip U be connected.Described amplifier P
Outfan be connected with the input of amplifier circuit.
It addition, described detection output circuit is by audion VT1, audion VT2, resistance R5, electric capacity C5,
Electric capacity C6 and diode D4 composition.
During connection, the positive pole of electric capacity C5 is connected with the outfan of phase-locked loop circuit, its negative pole and audion
The base stage of VT1 is connected.One end of resistance R5 is connected with the emitter stage of audion VT1, its other end
It is connected with the GND pin of detection chip U.The positive pole of electric capacity C6 is connected with the emitter stage of audion VT2
Connect, its negative pole be connected with the GND pin of detection chip U while ground connection.The N pole of diode D4 with
The positive pole of electric capacity C1 is connected, its P pole is connected with the base stage of audion VT2.Described audion VT2
Base stage be connected with the colelctor electrode of audion VT1, its colelctor electrode is connected with the N pole of diode D4,
Its emitter stage is as outfan and connects external microcontroller.
As in figure 2 it is shown, described amplifier circuit is by audion VT3, audion VT4, resistance R6, electricity
Resistance R7, resistance R8, diode D5, diode D6, diode D7, electric capacity C7, electric capacity C8 and
Electric capacity C9 forms.
During connection, the negative pole of electric capacity C7 is connected with the base stage of audion VT3, its positive pole is as this sampling
The input of amplifying circuit is also connected with the outfan of amplifier P.One end of resistance R6 and audion VT3
Emitter stage be connected, its other end ground connection.The N pole of diode D7 and the emitter stage phase of audion VT4
Connection, its P pole ground connection.The positive pole of electric capacity C8 is connected with the emitter stage of audion VT4, its negative pole with
The P pole of diode D7 is connected.Resistance R7 is serially connected in P pole and the base of audion VT3 of diode D7
Between pole.The positive pole of electric capacity C9 emitter stage with audion VT3 after resistance R8 is connected, its negative pole is made
For the outfan of this amplifier circuit and it is connected with the positive pole of electric capacity C3.The N pole of diode D6 and electricity
The positive pole of appearance C9 is connected, its P pole is connected with the colelctor electrode of audion VT4.The N of diode D5
Pole is connected with the positive pole of electric capacity C9, its P pole is connected with the colelctor electrode of audion VT3.Described three poles
The base stage of pipe VT4 is connected with the colelctor electrode of audion VT3.
As it is shown on figure 3, described phase-locked loop circuit is by amplifier P1, amplifier P2, audion VT5, resistance
R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, diode
D8, electric capacity C10 and electric capacity C11 form.
During connection, resistance R9 is serially connected between the outfan of amplifier P2 and the positive pole of amplifier P1.Resistance
R10 is serially connected between the outfan of amplifier P2 and the negative pole of amplifier P1.Resistance R11 is serially connected in amplification
Between negative pole and the emitter stage of audion VT5 of device P1.Resistance R13 be serially connected in amplifier P1 positive pole and
Between the colelctor electrode of audion VT5.The positive pole of electric capacity C10 is connected with the positive pole of amplifier P1, it is born
Pole is connected with the outfan of amplifier P1.The positive pole of electric capacity C11 is connected with the outfan of amplifier P1,
Its negative pole base stage with audion VT5 after resistance R14 is connected.The N pole of diode D8 and amplifier
The positive pole of P2 is connected, its P pole negative pole with electric capacity C11 after resistance R15 is connected.Resistance R12
It is serially connected between outfan and the negative pole of amplifier P2.The outfan of described amplifier P2 is as this phaselocked loop
The input of circuit is also connected with the Q pin of detection chip U.The grounded emitter of described audion VT5；
The outfan of described amplifier P1 as the outfan of this phase-locked loop circuit and is connected with the positive pole of electric capacity C5.
The present invention uses the integrated chip of SN74121N to combine with peripheral circuit so that it is has higher resisting and does
Disturbing ability, even if remaining able to stable work in the case of fluctuation occurs in electrical network, detecting electricity accurately
The zero crossing of alternating current in the line of force.Meanwhile, signal can be amplified by the present invention, and the phase place to voltage
Carry out locking to enable the invention to preferably signal is identified, process, such that it is able to improve the present invention's
Accuracy of detection.
As it has been described above, just can well realize the present invention.
Claims (7)
1. a phase-locking type electrical network zero-crossing detection system based on amplifier circuit, it is characterised in that: main
By detection chip U, power circuit, the sample circuit being connected with power circuit, it is connected with sample circuit
Amplifier circuit, negative pole is connected with the B pin of detection chip U, positive pole and amplifier circuit phase
The electric capacity C3 connected, positive pole is connected with the CEXT pin of detection chip U, negative pole and detection chip U
The electric capacity C4 that is connected of REXT pin, one end is connected with the VCC pin of detection chip U, another
The resistance R4 that end is connected with power circuit, the phase-locked loop circuit being connected with the Q pin of detection chip U,
And the detection output circuit composition being connected with the GND pin of phase-locked loop circuit and detection chip U respectively；
Described detection output circuit is also connected with power circuit.
A kind of phase-locking type of based on amplifier circuit the most according to claim 1 electrical network zero passage detection system
System, it is characterised in that: described phase-locked loop circuit is by amplifier P1, amplifier P2, audion VT5, concatenation
Resistance R9 between the outfan and the positive pole of amplifier P1 of amplifier P2, is serially connected in amplifier P2's
Resistance R10 between the negative pole of outfan and amplifier P1, is serially connected in negative pole and the audion of amplifier P1
Resistance R11 between the emitter stage of VT5, is serially connected in positive pole and the colelctor electrode of audion VT5 of amplifier P1
Between resistance R13, positive pole is connected with the positive pole of amplifier P1, the outfan of negative pole and amplifier P1
The electric capacity C10 being connected, positive pole is connected with the outfan of amplifier P1, negative pole after resistance R14 with three
Electric capacity C11, the N pole that the base stage of pole pipe VT5 is connected is connected with the positive pole of amplifier P2, P pole is through electricity
The diode D8 being connected with the negative pole of electric capacity C11 after resistance R15, and it is serially connected in the output of amplifier P2
Resistance R12 composition between end and negative pole；Defeated as this phase-locked loop circuit of the outfan of described amplifier P2
Enter end and be connected with the Q pin of detection chip U；The grounded emitter of described audion VT5；Described put
The outfan of big device P1 as the outfan of this phase-locked loop circuit and is connected with detection output circuit.
A kind of phase-locking type of based on amplifier circuit the most according to claim 2 electrical network zero passage detection system
System, it is characterised in that: described amplifier circuit is by audion VT3, audion VT4, negative pole and three poles
The base stage of pipe VT3 is connected, positive pole is as the electric capacity C7 of the input of this amplifier circuit, one end and three
The emitter stage of pole pipe VT3 is connected, the transmitting of resistance R6, the N pole of other end ground connection and audion VT4
Pole is connected, the diode D7 of P pole ground connection, positive pole is connected with the emitter stage of audion VT4, negative pole with
The electric capacity C8 that the P pole of diode D7 is connected, is serially connected in the P pole of diode D7 and audion VT3
Resistance R7 between base stage, positive pole emitter stage with audion VT3 after resistance R8 is connected, negative pole is made
Be connected with the positive pole of electric capacity C9 for electric capacity C9, the N pole of the outfan of this amplifier circuit, P pole and three
The diode D6 that the colelctor electrode of pole pipe VT4 is connected, and N pole is connected with the positive pole of electric capacity C9, P
The diode D5 composition that pole is connected with the colelctor electrode of audion VT3；The base stage of described audion VT4 with
The colelctor electrode of audion VT3 is connected；The input of described amplifier circuit is connected with sample circuit,
Its outfan then positive pole with electric capacity C3 is connected.
A kind of phase-locking type of based on amplifier circuit the most according to claim 3 electrical network zero passage detection system
System, it is characterised in that: described power circuit is by the secondary inductance coil of transformator T, positive pole and transformator T
The electric capacity C1 that non-same polarity is connected, negative pole is connected with the Same Name of Ends of the secondary inductance coil of transformator T
Composition；The positive pole of described electric capacity C1 is all connected with sample circuit with negative pole.
A kind of phase-locking type electrical network zero passage detection based on amplifier circuit the most according to claim 4
System, it is characterised in that: described sample circuit is connected with the negative pole of amplifier P by amplifier P, N pole,
The negative pole of diode D3, the P pole that P pole negative pole with amplifier P after resistance R2 is connected and amplifier P
Be connected, the positive pole of diode D2, N pole that N pole is connected with the P pole of diode D3 and amplifier P
Be connected, P pole after resistance R3 respectively with negative pole and the GND pin phase of detection chip U of electric capacity C1
The diode D1 connected, positive pole is connected with the negative pole of amplifier P, the P pole phase of negative pole and diode D3
The electric capacity C2 connected, and one end is connected with the negative pole of amplifier P, the positive pole of the other end and electric capacity C1
The resistance R1 composition being connected；The outfan of described amplifier P is connected with the input of amplifier circuit；
The positive pole of described electric capacity C1 also after resistance R4 VCC pin with detection chip U be connected.
A kind of phase-locking type of based on amplifier circuit the most according to claim 5 electrical network zero passage detection system
System, it is characterised in that: described detection output circuit is by audion VT1, audion VT2, and positive pole is with phase-locked
The electric capacity C5 that the outfan of loop circuit is connected, negative pole is connected with the base stage of audion VT1, one end and three
The resistance R5 that the emitter stage of pole pipe VT1 is connected, the other end is connected with the GND pin of detection chip U,
Positive pole is connected with the emitter stage of audion VT2, negative pole is connected with the GND pin of detection chip U
The positive pole of the electric capacity C6 of ground connection, and N pole simultaneously and electric capacity C1 is connected, P pole and audion VT2
The diode D4 composition that base stage is connected；The base stage of described audion VT2 and the colelctor electrode of audion VT1
Be connected, its colelctor electrode is connected with the N pole of diode D4, its emitter stage is as outfan.
A kind of phase-locking type of based on amplifier circuit the most according to claim 6 electrical network zero passage detection system
System, it is characterised in that: described detection chip U is the integrated chip of SN74121N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610565902.9A CN106018935A (en) | 2016-07-18 | 2016-07-18 | Phase-locked grid zero-crossing detection system based on sampling amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610565902.9A CN106018935A (en) | 2016-07-18 | 2016-07-18 | Phase-locked grid zero-crossing detection system based on sampling amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106018935A true CN106018935A (en) | 2016-10-12 |
Family
ID=57119700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610565902.9A Pending CN106018935A (en) | 2016-07-18 | 2016-07-18 | Phase-locked grid zero-crossing detection system based on sampling amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106018935A (en) |
-
2016
- 2016-07-18 CN CN201610565902.9A patent/CN106018935A/en active Pending
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Application publication date: 20161012 |