CN205015392U - Zero -crossing detection circuit - Google Patents

Zero -crossing detection circuit Download PDF

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Publication number
CN205015392U
CN205015392U CN201520631182.2U CN201520631182U CN205015392U CN 205015392 U CN205015392 U CN 205015392U CN 201520631182 U CN201520631182 U CN 201520631182U CN 205015392 U CN205015392 U CN 205015392U
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CN
China
Prior art keywords
zero
module
crossing
detection circuit
crossing detection
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Expired - Fee Related
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CN201520631182.2U
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Chinese (zh)
Inventor
李四平
韩利
孟培
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Xiamen Minke Electrical Appliance Technology Co Ltd
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Xiamen Minke Electrical Appliance Technology Co Ltd
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Abstract

The utility model discloses a zero -crossing detection circuit, this zero -crossing detection circuit exchanges voltage reducing module through setting up, zero crossing detection module and closed branch compensate the module absolutely, utilize interchange voltage reducing module to convert the high pressure into the voltage that can drive zero crossing detection module, utilize zero crossing detection module to carry out the zero crossing differentiation to the voltage of input, it is responsible for two above -mentioned modules of compensation to compensate the module absolutely through the closure branch simultaneously, make closed / minute disconnected signal give when sending one postpone in case the drive closed / can agree with at the zero crossing in minute disconnected, consequently, the synchronous wave form of realization that this zero -crossing detection circuit not only can be real detects the zero crossing, but also has closure / minute disconnected compensation function, real can the breaking at the zero crossing branch of circuit has been guaranteed, it draws the arc to have reduced the contact, the stability of life -span when whole product area capacitive load or inductive load with is improved.

Description

A kind of zero-crossing detection circuit
Technical field
The utility model relates to voltage detecting technical field, refers more particularly to a kind of voltage zero-crossing detection circuit and device.
Background technology
Voltage zero-cross refer to the voltage of AC signal from just half circumferential negative half period conversion or from negative half period to positive half cycle conversion through zero-bit, the voltage difference of this zero-bit and reference point is zero.In electronic circuitry design, usually using voltage zero-cross as time reference, creating voltage zero-crossing detection circuit to obtain the voltage zero-cross of AC signal.1. in present electronic switch socket, generally not there is zero-crossing detection circuit, particularly when electronic switch access capacitive load (being typically LED electronic transformer), inductive load (being typically ferromagnetic transformer), if switch is at 90 degree, near 270 degree of phase places during ON/OFF, easy generation contact arc discharge, reduces switch life.Although existing individual electronic switch product has zero-crossing detection circuit, sample circuit adopts DC pulse zero passage detection, and the zero crossing of detection has deviation, and effect is bad.Although and existing individual electronic switch product has zero-crossing detection circuit, do not have closed/disjunction compensate function, namely contact is not close at real zero crossing/disconnect, and still can cause high power load contact striking.
Utility model content
In order to solve the above-mentioned problems in the prior art, the utility model provide a kind of accurately can be detected zero point and can realize really cross zero-compensation close/disjunction zero-crossing detection circuit.
The technical scheme that the utility model provides is as follows: it comprises ac buck module, zero-crossing examination module and closed disjunction compensating module, alternating voltage is converted to the input voltage that can drive described zero-crossing examination module by described ac buck module, input voltage is converted to sync waveform and carries out zero-crossing examination by described zero-crossing examination module, and described closed disjunction compensating module and described ac buck module are connected with zero-crossing examination module and compensate the closed disjunction input signal of described zero-crossing examination module.
In preferred embodiment of the present utility model, described ac buck module adopts linear voltage decreasing pattern.
In preferred embodiment of the present utility model, described ac buck module is by alternating current sampling end successively resistance in series Rl and resistance R2 to earth terminal, and described resistance Rl is connected with described closed disjunction compensating module as output terminal with between resistance R2.
In preferred embodiment of the present utility model, described closed disjunction compensating module comprises triode Q1, the base stage of described triode Q1 is connected with the output terminal between described resistance Rl and resistance R2, and the collector of described triode Q1 is connected to 5V signal end, described triode Q1 grounded emitter.
In preferred embodiment of the present utility model, also comprise single-chip microcomputer, described single-chip microcomputer comprises ACI mouth and I/O port, and described Chip Microcomputer A CI mouth is connected with the collector of described triode Q1, and described single-chip I/O mouth is the input port of described zero-crossing examination module.
In preferred embodiment of the present utility model, described single-chip I/O mouth is connected with the base stage of described triode Q1 by described resistance R1.
In preferred embodiment of the present utility model, described zero-crossing examination module comprises relay and diode D1, described relay comprises A1 end and A2 end, described diode D1 comprises 1 pin and 2 pin, 1 pin of described diode D1 is held with described A2 respectively with 2 pin and A1 holds and is connected, and described diode D1 is used for absorbing the reverse voltage of described relay.
In preferred embodiment of the present utility model, the model of described relay is HF115 relay, and the model of described diode D1 is A7 diode.
In preferred embodiment of the present utility model, the collector of described triode Q1 is connected to the A1 end of described relay, and the A2 end of described relay is connected to 5V signal end.
In preferred embodiment of the present utility model, described zero-crossing examination module also comprises the first electric capacity C1, and one end of described first electric capacity C1 is connected with the emitter of described triode Q1, and the other end is connected with described resistance R1.
The beneficial effect that the utility model produces is: this zero-crossing detection circuit is by arranging ac buck module, zero-crossing examination module and closed disjunction compensating module, ac buck module is utilized high pressure to be converted to the voltage that can drive zero-crossing examination module, the voltage of zero-crossing examination module to input is utilized to differentiate, and export synchronous waveform signal at Chip Microcomputer A CI end, and judge zero crossing according to the rising edge of waveform and negative edge, be responsible for compensating above-mentioned two modules by closed disjunction compensating module simultaneously, enable to close/breaking signal give when sending one postpone in case driving closed/disjunction in agree with at zero crossing, therefore the sync waveform that realizes that this zero-crossing detection circuit not only can be real is detected zero point, but also there is closed/disjunction compensate function, ensure that circuit real can in zero crossing disjunction, reduce contact arcing, life-span when improve integral product band capacitive load or inductive load and stability.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of ac buck module in zero-crossing detection circuit of the present utility model;
Fig. 2 is the circuit diagram of zero-crossing examination module in zero-crossing detection circuit of the present utility model;
Fig. 3 is the circuit diagram of closed disjunction compensating module in zero-crossing detection circuit of the present utility model.
Embodiment
See Fig. 1, Fig. 2 and Fig. 3, this zero-crossing detection circuit comprises ac buck module 10, zero-crossing examination module 20 and closed disjunction compensating module 30, alternating voltage is converted to the input voltage that can drive zero-crossing examination module 20 by ac buck module 10, input voltage is converted to sync waveform and carries out zero-crossing examination by zero-crossing examination module 20, and closed disjunction compensating module 30 and ac buck module 10 are connected with zero-crossing examination module 20 and compensate the closed disjunction input signal of zero-crossing examination module 20.
See Fig. 1, ac buck module 10, is connected with closed disjunction compensating module 30 as output terminal between resistance Rl with resistance R2 to earth terminal by alternating current sampling end L successively resistance in series Rl and resistance R2.
See Fig. 1, Fig. 2 and Fig. 3, closed disjunction compensating module 30 comprises triode Q1, and the base stage of triode Q1 is connected with the output terminal between resistance Rl and resistance R2, and the collector of triode Q1 is connected to 5V signal end, triode Q1 grounded emitter.Also comprise single-chip microcomputer (not shown), this single-chip microcomputer comprises ACI mouth and I/O port, and Chip Microcomputer A CI mouth is connected with the collector of triode Q1, and single-chip I/O mouth Trip is delivery outlet, and this Trip port is the input port of zero-crossing examination module 20.This Trip port is connected with the base stage of triode Q1 by resistance R1.
See Fig. 2, zero-crossing examination mould 20 comprises relay R elay and diode D1, relay R elay comprises A1 end and A2 end, diode D1 comprises 1 pin and 2 pin, 1 pin of diode D1 is held with A2 respectively with 2 pin and A1 holds and is connected, diode D1 is used for absorbing the reverse voltage of relay R elay, and the collector of triode Q1 is connected to the A1 end of relay R elay, and the A2 end of relay R elay is connected to 5V signal end.The model of relay R elay is HF115 relay, and the model of diode D1 is A7 diode.Zero-crossing examination module 20 also comprises the first electric capacity C1, one end of first electric capacity C1 is connected with the emitter of triode Q1, the other end is connected with described resistance R1, this first electric capacity C1 can give a delay (time namely in next zero crossing half-wave of alternating current) in closed/breaking signal when sending, its capacitance needs to coordinate with time delay can agree with when driving closed/disjunction zero crossing (also can provide action command by single-chip microcomputer internal logic circuit after matching certain delay time, with closed/disjunction during zero crossing).
During work, this zero-crossing detection circuit utilizes ac buck module 10 high pressure to be converted to the voltage that can drive zero-crossing examination module 20, because this ac buck module 10 is by resistance Rl and resistance R2 linear voltage decreasing, so its waveform and phase place can not be changed in pressure reduction, what export after step-down is still AC signal, the voltage of zero-crossing examination module 20 to input is then utilized to differentiate, and export synchronous waveform signal at Chip Microcomputer A CI end, because this signal is square wave, therefore zero crossing can be judged according to the rising edge of waveform and negative edge, now be responsible for compensating above-mentioned ac buck module 10 and zero-crossing examination module 20 by closed disjunction compensating module 30, enable to close/breaking signal give when sending one postpone in case driving closed/disjunction in agree with at zero crossing, therefore the sync waveform that realizes that this zero-crossing detection circuit not only can be real is detected zero point, but also there is closed/disjunction compensate function, ensure that circuit real can in zero crossing disjunction, reduce contact arcing, life-span when improve integral product band capacitive load or inductive load and stability.
Above are only a specific embodiment of the present utility model, but design concept of the present utility model is not limited thereto, all changes utilizing this design the utility model to be carried out to unsubstantiality, all should belong to the behavior of invading the utility model protection domain.

Claims (10)

1. a zero-crossing detection circuit, it is characterized in that: it comprises ac buck module, zero-crossing examination module and closed disjunction compensating module, alternating voltage is converted to the input voltage that can drive described zero-crossing examination module by described ac buck module, input voltage is converted to sync waveform and carries out zero-crossing examination by described zero-crossing examination module, and described closed disjunction compensating module and described ac buck module are connected with zero-crossing examination module and compensate the closed disjunction input signal of described zero-crossing examination module.
2. zero-crossing detection circuit according to claim 1, is characterized in that: described ac buck module adopts linear voltage decreasing pattern.
3. zero-crossing detection circuit according to claim 2, it is characterized in that: described ac buck module is by alternating current sampling end successively resistance in series Rl and resistance R2 to earth terminal, and described resistance Rl is connected with described closed disjunction compensating module as output terminal with between resistance R2.
4. zero-crossing detection circuit according to claim 3, it is characterized in that: described closed disjunction compensating module comprises triode Q1, the base stage of described triode Q1 is connected with the output terminal between described resistance Rl and resistance R2, the collector of described triode Q1 is connected to 5V signal end, described triode Q1 grounded emitter.
5. zero-crossing detection circuit according to claim 4, it is characterized in that: also comprise single-chip microcomputer, described single-chip microcomputer comprises ACI mouth and I/O port, and described Chip Microcomputer A CI mouth is connected with the collector of described triode Q1, and described single-chip I/O mouth is the input port of described zero-crossing examination module.
6. zero-crossing detection circuit according to claim 5, is characterized in that: described single-chip I/O mouth is connected with the base stage of described triode Q1 by described resistance R1.
7. zero-crossing detection circuit according to claim 4, it is characterized in that: described zero-crossing examination module comprises relay and diode D1, described relay comprises A1 end and A2 end, described diode D1 comprises 1 pin and 2 pin, 1 pin of described diode D1 is held with described A2 respectively with 2 pin and A1 holds and is connected, and described diode D1 is used for absorbing the reverse voltage of described relay.
8. zero-crossing detection circuit according to claim 7, is characterized in that: the model of described relay is HF115 relay, and the model of described diode D1 is A7 diode.
9. zero-crossing detection circuit according to claim 7, is characterized in that: the collector of described triode Q1 is connected to the A1 end of described relay, and the A2 end of described relay is connected to 5V signal end.
10. zero-crossing detection circuit according to claim 4, is characterized in that: described zero-crossing examination module also comprises the first electric capacity C1, and one end of described first electric capacity C1 is connected with the emitter of described triode Q1, and the other end is connected with described resistance R1.
CN201520631182.2U 2015-08-20 2015-08-20 Zero -crossing detection circuit Expired - Fee Related CN205015392U (en)

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Application Number Priority Date Filing Date Title
CN201520631182.2U CN205015392U (en) 2015-08-20 2015-08-20 Zero -crossing detection circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106526474A (en) * 2016-12-01 2017-03-22 国网冀北电力有限公司电力科学研究院 Zero-crossing operation test system and method for load switch for electric energy meter
CN107976573A (en) * 2017-12-27 2018-05-01 厦门赛特勒磁电有限公司 A kind of relay surge voltage current management system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106526474A (en) * 2016-12-01 2017-03-22 国网冀北电力有限公司电力科学研究院 Zero-crossing operation test system and method for load switch for electric energy meter
CN106526474B (en) * 2016-12-01 2023-05-26 国网冀北电力有限公司电力科学研究院 Load switch zero crossing operation test system and method for electric energy meter
CN107976573A (en) * 2017-12-27 2018-05-01 厦门赛特勒磁电有限公司 A kind of relay surge voltage current management system

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Granted publication date: 20160203

CF01 Termination of patent right due to non-payment of annual fee