CN203759106U - Commercial power zero cross detection circuit - Google Patents

Commercial power zero cross detection circuit Download PDF

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Publication number
CN203759106U
CN203759106U CN201420122786.XU CN201420122786U CN203759106U CN 203759106 U CN203759106 U CN 203759106U CN 201420122786 U CN201420122786 U CN 201420122786U CN 203759106 U CN203759106 U CN 203759106U
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CN
China
Prior art keywords
civil power
resistance
triode
control module
connects
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Expired - Fee Related
Application number
CN201420122786.XU
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Chinese (zh)
Inventor
顾健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RISECOMM MICROELECTRONICS (SHENZHEN) CO Ltd
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RISECOMM MICROELECTRONICS (SHENZHEN) CO Ltd
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Priority to CN201420122786.XU priority Critical patent/CN203759106U/en
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Publication of CN203759106U publication Critical patent/CN203759106U/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero

Abstract

The utility model provides a commercial power zero cross detection circuit, which relates to the carrier wave technology of power lines, and comprises a pulse generation control module which accelerates the power-discharging process when the commercial power voltage is from a positive half cycle to zero crossing, and an optical coupler. The first end of the pulse generation control module is connected to a live wire of the commercial power, and the second end of the pulse generation control module is connected to the zero line of the commercial power, and the third end of the pulse generation control module is connected to the anode of a light emitting diode in the optical coupler. The cathode of the light emitting diode in the optical coupler is connected to the zero line of the commercial power, and the collector electrode of a photoelectric triode in the optical coupler is connected to low-voltage direct current, and an emitter electrode of the photoelectric triode in the optical coupler is grounded and is used as an output terminal of zero-crossing pulse. The commercial power zero cross detection circuit is advantageous in that the circuit is simple, and is not easy to be affected by commercial power voltage or component parameters.

Description

A kind of civil power zero cross detection circuit
Technical field
The utility model belongs to power-line carrier communication, relates in particular to a kind of civil power zero cross detection circuit.
Background technology
Power-line carrier communication is a kind of technology of carrying out data communication by the supply line of civil power, and this technology is greater than on sinusoidal wave carrier waves more than tens of KHz from different being generally of mains frequency (50Hz or 60Hz) for modulating data on one.In power-line carrier communication system, in order to reach good communication efficiency, need to detect civil power zero crossing.Existing civil power zero cross detection circuit or too complicated, or have larger impact for its precision is subject to the variation of component parameters and line voltage.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of civil power zero cross detection circuit, is intended to solve existing zero cross detection circuit more complicated and is subject to voltage fluctuation to affect larger problem.
The utility model is achieved in that a kind of civil power zero cross detection circuit, makes the pulse that discharge process is accelerated produce control module and optocoupler while being included in line voltage from positive half cycle to zero crossing; Described pulse produces the first end of control module and the live wire of civil power is connected, the second end that described pulse produces control module is connected with the zero line of civil power, the 3rd end that described pulse the produces control module pulse generation control module that is connected with the anode of light emitting diode in optocoupler;
In described optocoupler, the negative electrode of light emitting diode and the zero line of civil power are connected, and the collector of the phototriode in described optocoupler connects low-voltage DC, the grounded emitter of the phototriode in described optocoupler and the output terminal as zero-crossing pulse.
Further, described pulse generation control module comprises the triode Q1 of resistance R 1, resistance R 2, capacitor C 1, NPN type and the triode Q2 of NPN type;
The first end of described capacitor C 1 connects the zero line of civil power, and the second end of described capacitor C 1 connects the live wire of civil power by resistance R 1; The base stage of described triode Q2 connects described live wire, and the emitter of described triode Q2 connects zero line, and the collector of described triode Q2 connects the live wire of civil power by resistance R 2, resistance R 1; The base stage of described triode Q1 connects the collector of described triode Q2, and the collector of described triode Q1 is connected on live wire by described resistance R 1, and the emitter of described triode Q1 connects the anode of light emitting diode in described optocoupler.
Further, described pulse generation control module also comprises resistance R 3 and diode D1;
Described capacitor C 1 is connected with resistance R 1 by described diode D1; One end of resistance R 1 described in the anodic bonding of described diode D1, described diode D1 negative electrode connects the positive pole of described capacitor C 1;
The base stage of described triode Q2 is connected to the live wire of civil power by described resistance R 3.
Further, described civil power zero cross detection circuit also comprises diode D2, the anodic bonding zero line of described diode D2, and the negative electrode of described diode D2 connects the base stage of described triode Q2.
Compared with prior art, beneficial effect is the utility model: described civil power zero cross detection circuit is simple, and is not subject to the impact of line voltage or component parameter, and accuracy of detection can be in ten microseconds.
Brief description of the drawings
Fig. 1 is the basic circuit diagram of the utility model civil power zero cross detection circuit;
Fig. 2 is the illustraton of model of the utility model civil power zero cross detection circuit in the time that computing machine is simulated;
Fig. 3 is the oscillogram while simulating by the illustraton of model in Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, for the utility model one preferred embodiment, a kind of civil power zero cross detection circuit, while being included in line voltage from positive half cycle to zero crossing, make the pulse that discharge process is accelerated produce control module 101 and optocoupler U1, described pulse produces the first end of control module 101 and the live wire of civil power (being the line that is labeled as L in Fig. 1) is connected, described pulse produces the second end of control module 101 and the zero line of civil power (being the line that is labeled as N in Fig. 1) is connected, the 3rd end that described pulse produces control module 101 is connected with the anode of light emitting diode in optocoupler U1.In described optocoupler U1, the negative electrode of light emitting diode and the zero line of civil power are connected, the collector of the phototriode in described optocoupler U1 connects low-voltage DC, the grounded emitter of the phototriode in described optocoupler U1 and as the output terminal of zero-crossing pulse, the output terminal that ZC_DTC in Fig. 1 is zero-crossing pulse.Optocoupler U1, for isolating live wire and the zero line of civil power, uses the signal processing system of 5 volts of low pressure simultaneously.
Described pulse produces control module 101 and comprises the triode Q1 of resistance R 1, resistance R 2, capacitor C 1, NPN type and the triode Q2 of NPN type.The first end of capacitor C 1 connects the zero line of civil power, and the second end of capacitor C 1 is connected on the live wire of civil power by resistance R 1.The base stage of triode Q2 connects described live wire, and the emitter of triode Q2 is connected on zero line, and the collector of triode Q2 is connected on the live wire of civil power by resistance R 2, resistance R 1.The collector of the base stage connecting triode Q2 of triode Q1, the collector of triode Q1 is connected on live wire by described resistance R 1, and the emitter of described triode Q1 connects the anode of light emitting diode in described optocoupler.The resistance of resistance R 1 and resistance R 2 is all larger, and preferred, resistance R 1 is 560K Ω, and R2 is 30K Ω, and capacitor C 1 is 1 μ F.
When the positive half cycle of civil power, triode Q2 conducting in state of saturation, because the resistance of resistance R 1 and resistance R 2 is all larger, now triode Q1 is in cut-off state, and capacitor C 1 starts energy storage, and the maximum voltage of capacitor C 1 is determined by resistance R 1 and the intrinsic standoff ratio of resistance R 2.Line voltage is during from positive half cycle to zero crossing, and triode Q2 cut-off, makes triode Q1 conducting, and capacitor C 1 is discharged by triode Q1, accelerates, thereby make the rapid discharge off of capacitor C 1 because the unexpected conducting of triode Q1 makes discharge process.Electric current in discharge process flows through the diode of optocoupler U1, makes optocoupler U1 outgoing side produce instantaneous large-current pulse.The value of capacitor C 1 is less, and output pulse is narrower.When changing 50%, the parameter of components and parts also can not affect the precision of this civil power zero cross detection circuit.The accuracy requirement of described civil power zero cross detection circuit can reach 1% of null cycle, and existing ball bearing made using scheme can only reach 10% conventionally.
Combine with above-mentioned each embodiment, described pulse produces control module 101 and also comprises resistance R 3 and diode D1.Described capacitor C 1 is connected with resistance R 1 by described diode D1.One end of resistance R 1 described in the anodic bonding of described diode D1, the negative electrode of described diode D1 connects the positive pole of described capacitor C 1.The base stage of described triode Q2 is connected to the live wire of civil power by described resistance R 3.Be the other end that one end of described resistance R 3 connects described resistance R 1, the other end of described resistance R 3 connects the base stage of described triode Q2.Preferably, the resistance of resistance R 3 is 560K Ω.
Combine with above-mentioned each embodiment, described civil power zero cross detection circuit also comprises diode D2, the anodic bonding zero line of described diode D2, and the negative electrode of described diode D2 connects the base stage of described triode Q2.
Fig. 2 is the illustraton of model that adopts civil power zero cross detection circuit of the present utility model to simulate on computers, and wherein resistance R 4 and resistance R 5 are reference point of setting up for display simulation result magnitude of voltage in same table, irrelevant with practical application.Fig. 3 is simulated the waveform result drawing by computing machine according to the illustraton of model in Fig. 2.
Described civil power zero cross detection circuit is simple, and output pulse position precision is high and pulse is narrow.Precision is subject to the influence of fluctuations of line voltage little, and line voltage is flowing in the scope of 100V to 250V almost not to be affected this zero cross detection circuit.The component parameter error range of allowing can be larger, can in 50% scope, change.The electric current drawing from civil power is little, is generally less than 0.5 milliampere.Described civil power zero cross detection circuit will replace the zero cross detection circuit being used at present in power line carrier module.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims (4)

1. a civil power zero cross detection circuit, is characterized in that, makes the pulse that discharge process is accelerated produce control module and optocoupler while being included in line voltage from positive half cycle to zero crossing; Described pulse produces the first end of control module and the live wire of civil power is connected, the second end that described pulse produces control module is connected with the zero line of civil power, the 3rd end that described pulse the produces control module pulse generation control module that is connected with the anode of light emitting diode in optocoupler;
In described optocoupler, the negative electrode of light emitting diode and the zero line of civil power are connected, and the collector of the phototriode in described optocoupler connects low-voltage DC, the grounded emitter of the phototriode in described optocoupler and the output terminal as zero-crossing pulse.
2. civil power zero cross detection circuit according to claim 1, is characterized in that, described pulse produces control module and comprises the triode Q1 of resistance R 1, resistance R 2, capacitor C 1, NPN type and the triode Q2 of NPN type;
The first end of described capacitor C 1 connects the zero line of civil power, and the second end of described capacitor C 1 connects the live wire of civil power by resistance R 1; The base stage of described triode Q2 connects described live wire, and the emitter of described triode Q2 connects zero line, and the collector of described triode Q2 connects the live wire of civil power by resistance R 2, resistance R 1; The base stage of described triode Q1 connects the collector of described triode Q2, and the collector of described triode Q1 is connected on live wire by described resistance R 1, and the emitter of described triode Q1 connects the anode of light emitting diode in described optocoupler.
3. civil power zero cross detection circuit according to claim 2, is characterized in that, described pulse produces control module and also comprises resistance R 3 and diode D1;
Described capacitor C 1 is connected with resistance R 1 by described diode D1; One end of resistance R 1 described in the anodic bonding of described diode D1, described diode D1 negative electrode connects the positive pole of described capacitor C 1; The base stage of described triode Q2 is connected to the live wire of civil power by described resistance R 3.
4. according to the civil power zero cross detection circuit described in claim 2 or 3, it is characterized in that, described civil power zero cross detection circuit also comprises diode D2, the anodic bonding zero line of described diode D2, and the negative electrode of described diode D2 connects the base stage of described triode Q2.
CN201420122786.XU 2014-03-18 2014-03-18 Commercial power zero cross detection circuit Expired - Fee Related CN203759106U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420122786.XU CN203759106U (en) 2014-03-18 2014-03-18 Commercial power zero cross detection circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201420122786.XU CN203759106U (en) 2014-03-18 2014-03-18 Commercial power zero cross detection circuit
PCT/CN2014/089343 WO2015139456A1 (en) 2014-03-18 2014-10-23 Zero-cross detection circuit for mains supply

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CN203759106U true CN203759106U (en) 2014-08-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015139456A1 (en) * 2014-03-18 2015-09-24 瑞斯康微电子(深圳)有限公司 Zero-cross detection circuit for mains supply
CN107656132A (en) * 2017-09-30 2018-02-02 漳州科能电器有限公司 The antidote of the alternating voltage zero-crossing point detection of power line carrier module

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE789423A (en) * 1971-09-30 1973-03-28 Westinghouse Electric Corp ZERO PASSAGE DETECTOR
CN101059554B (en) * 2007-04-28 2011-07-20 何毓宁 Specific exciting frequency accumulator on-line internal resistance four-line measurement method and signal source device
CN102215035B (en) * 2011-05-12 2016-02-10 青岛鼎信通讯股份有限公司 A kind of isolation of the electric main in conjunction with low-voltage powerline carrier communication signal coupling zero cross detection circuit
CN102508014B (en) * 2011-12-09 2013-11-27 上海翊昊微电子有限公司 Power line carrier communication zero-crossing detection system and method thereof
CN103063904A (en) * 2012-12-30 2013-04-24 青岛东软载波科技股份有限公司 Zero cross detection circuit
CN203759106U (en) * 2014-03-18 2014-08-06 瑞斯康微电子(深圳)有限公司 Commercial power zero cross detection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015139456A1 (en) * 2014-03-18 2015-09-24 瑞斯康微电子(深圳)有限公司 Zero-cross detection circuit for mains supply
CN107656132A (en) * 2017-09-30 2018-02-02 漳州科能电器有限公司 The antidote of the alternating voltage zero-crossing point detection of power line carrier module
CN107656132B (en) * 2017-09-30 2021-07-13 漳州科能电器有限公司 Correction method for alternating voltage zero crossing point detection of power carrier module

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Granted publication date: 20140806

Termination date: 20190318