CN206618797U - A kind of zero-crossing detection circuit of power line carrier - Google Patents
A kind of zero-crossing detection circuit of power line carrier Download PDFInfo
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- CN206618797U CN206618797U CN201720367737.6U CN201720367737U CN206618797U CN 206618797 U CN206618797 U CN 206618797U CN 201720367737 U CN201720367737 U CN 201720367737U CN 206618797 U CN206618797 U CN 206618797U
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- 238000007600 charging Methods 0.000 description 3
- 206010014357 Electric shock Diseases 0.000 description 2
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Abstract
The utility model discloses a kind of zero-crossing detection circuit of power line carrier, including：Resistance R1, electric capacity C1, resistance R, diode VD1, diode VD2, electric capacity C, triode VT1, triode VT2, optocoupler D1, resistance R1 first end are connected with live wire, and resistance R1 the second end is connected with electric capacity C1 first end, resistance R first end；Electric capacity C1 the second end, diode VD1 negative pole, electric capacity C first end, optocoupler D1 anode are respectively connected with, and diode VD1 positive pole, electric capacity C the second end, diode VD2 positive pole, triode VT2 emitter stage are connected with live wire respectively；R the second end, VD2 negative pole, VT1 base stage are respectively connected with；VT1 emitter stage is connected with VT2 base stage, and VT1 colelctor electrode and VT2 colelctor electrode, D1 negative electrode are respectively connected with；D1 colelctor electrode is connected with supply voltage VCC, D1 grounded emitter.Zero-crossing detection circuit of power line carrier of the present utility model realizes strong and weak electric isolution, and precision is high, low in energy consumption, strong interference immunity.
Description
Technical field
The utility model is related to power line carrier communication field, more particularly to a kind of zero-crossing detection circuit of power line carrier.
Background technology
With continuing to develop and ripe for intelligent electric meter and power-line carrier communication, Guo Wang companies carry for power line
The meter reading success rate of wave communication is gradually stepped up.At the same time the popularization with Switching Power Supply in household electrical appliance, the leakage of its harmonic wave
Pollution for power network is also stepped up, and because frequency band is close, the harmonic wave directly influences the success rate of power line carrier communication,
Therefore it is difficult to meet requirement of the Guo Wang companies for meter reading success rate.The big amount measurement data in low-voltage power scene shows simultaneously, hands over
Stream electricity is especially suitable for doing carrier wave the features such as near zero-crossing point has continuous impedance, low harmonic pollution value, cycle and phase stabilization
Communication.
Therefore zero crossing communication is used by major carrier communication scheme manufacturers, by mass communication field measurement data
Checking, also achieves good communication efficiency and communication success rate.Zero cross detection circuit as carrier communication circuit a part,
For the zero crossing of accurate detection alternating current, carrier communication chip splits long frame data according to the zero crossing detected, even
Continue and enter row data communication in multiple near zero-crossing points very short time range, and then reduce due to load and impedance discontinuity, humorous
Communication caused by the reasons such as ripple pollution is unsuccessful.
Because zero cross detection circuit directly exchanges electrical connection with 220V, existing zero cross detection circuit typically uses resistance-capacitance depressurization
Or voltage-stabiliser tube clamper mode directly alternating current is depressured after driving triode or optocoupler.The former does not isolate at strong and weak electricity, in use
There is potential safety hazard, and power consumption is big, precision is low, anti-interference is very poor, false triggering easily occurs；Although the latter's strong and weak electricity every
From, but same anti-interference is poor, when power network has heavy duty start-stop, it is easy to cause optocoupler false triggering.
During the utility model is realized, inventor has found that prior art has following technical problem：Firstth, it is conventional
Zero cross detection circuit strong and weak electricity is not isolated；Secondth, conventional zero cross detection circuit accuracy of detection is low；3rd, conventional zero passage detection electricity
Road power consumption is high；4th, conventional zero cross detection circuit interference free performance is poor.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implies that the information structure has been existing well known to persons skilled in the art in any form
Technology.
Utility model content
The purpose of this utility model is to provide a kind of circuit for detecting power line carrier zero crossing, so as to overcome
Zero cross detection circuit strong and weak electricity present in prior art is not isolated, precision is low, power consumption is high and the problems such as poor interference free performance.
To achieve the above object, the utility model provides a kind of zero-crossing detection circuit of power line carrier, including：Resistance
R1, electric capacity C1, resistance R, diode VD1, diode VD2, electric capacity C, triode VT1, triode VT2, optocoupler D1, the resistance
R1 first end is connected with live wire, the second end of the resistance R1 and first end, the first end of the resistance R of the electric capacity C1
It is connected；The second end of the electric capacity C1, the negative pole of the diode VD1, the first end of the electric capacity C, the sun of the optocoupler D1
Pole is respectively connected with, the positive pole of the diode VD1, the second end of the electric capacity C, the positive pole of the diode VD2, three pole
Pipe VT2 emitter stage is connected with live wire respectively；The second end of the resistance R, the negative pole of the diode VD2, the triode
VT1 base stage is respectively connected with；The emitter stage of the triode VT1 is connected with the base stage of the triode VT2, the triode
VT1 colelctor electrode is respectively connected with the colelctor electrode of the triode VT2, the negative electrode of the optocoupler D1；The current collection of the optocoupler D1
Pole is connected with supply voltage VCC, the grounded emitter of the optocoupler D1.
In a kind of possible implementation, the circuit also includes：Resistance R2, the resistance R2 first end and the electricity
The second end for holding C1 is connected, and the second end of the resistance R2 is connected with the anode of the optocoupler D1.
In a kind of possible implementation, the circuit also includes：Resistance R5, the optocoupler D1 colelctor electrode pass through described
Resistance R5 is connected with the supply voltage VCC.
In a kind of possible implementation, the circuit also includes：Electric capacity C4, the electric capacity C4 first end and the light
Coupling D1 colelctor electrode is connected, the second end ground connection of the electric capacity C4.
In a kind of possible implementation, the resistance R includes resistance R3, resistance R4, resistance R6, resistance R7, resistance
R8, the resistance R3, resistance R4, resistance R6, resistance R7, resistance R8 are serially connected.
In a kind of possible implementation, the electric capacity C includes electric capacity C2, electric capacity C3, the electric capacity C2 and the electricity
Hold C3 in parallel.
In a kind of possible implementation, the diode VD1 is voltage-regulator diode.
Compared with prior art, the utility model has the advantages that：By the capacitance size for adjusting storage capacitor
The delay size between the zero crossing detected and actual zero point is directly adjusted, zero crossing is more accurately detected, reduces into
This while, improves the security, reliability, anti-interference of circuit, also reduces power consumption.Power line of the present utility model is carried
Ripple zero cross detection circuit can be realized：Zero crossing is accurately detected in the delay of near zero-crossing point very short time；Power is electrically isolated,
Eliminate the Danger Electric shock risk in use；Low-power consumption, can greatly improve product efficiency, the problems such as being generated heat without extra process；It is anti-interference
Property it is strong, it is applied widely, can preferably adapt to power line load changing, solve the problems, such as false triggering；It is with low cost, take PCB
Area is small, is applicable and produces in enormous quantities.
Brief description of the drawings
Fig. 1 is the principle schematic of zero-crossing detection circuit of power line carrier of the present utility model.
Fig. 2 is the oscillogram of ac power waveform figure of the present utility model and CLK50_IA port output signals.
Embodiment
Below in conjunction with the accompanying drawings, embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
As shown in figure 1, a kind of zero-crossing detection circuit of power line carrier of the present utility model, including：Resistance R1, electric capacity C1,
Resistance R, diode VD1, diode VD2, electric capacity C, triode VT1, triode VT2, optocoupler D1, the first end of the resistance R1
It is connected with live wire, the second end of the resistance R1 is connected with the first end of the electric capacity C1, the first end of the resistance R；It is described
Electric capacity C1 the second end, the negative pole of the diode VD1, the first end of the electric capacity C, the anode difference phase of the optocoupler D1
Even, the positive pole of the diode VD1, the second end of the electric capacity C, the positive pole of the diode VD2, the triode VT2
Emitter stage is connected with live wire respectively；The second end of the resistance R, the negative pole of the diode VD2, the base of the triode VT1
Pole is respectively connected with；The emitter stage of the triode VT1 is connected with the base stage of the triode VT2, the current collection of the triode VT1
Pole is respectively connected with the colelctor electrode of the triode VT2, the negative electrode of the optocoupler D1；The colelctor electrode of the optocoupler D1 and power supply electricity
VCC is pressed to be connected, the grounded emitter of the optocoupler D1.
In a kind of possible implementation, the circuit also includes：Resistance R2, the resistance R2 first end and the electricity
The second end for holding C1 is connected, and the second end of the resistance R2 is connected with the anode of the optocoupler D1.R2 limits conducting electric current, prevents
Caused optocoupler misoperation is changed by power line load transients, circuit stability and anti-interference is improved；R2 plays metering function,
Prevent because load changing causes optocoupler false triggering between L/N；
In a kind of possible implementation, the circuit also includes：Resistance R5, the optocoupler D1 colelctor electrode pass through described
Resistance R5 is connected with the supply voltage VCC.R5 controls optocoupler secondary current size, it is ensured that the normal output of class square wave, also leads to
Overregulate VCC magnitudes of voltage, the high level voltage value of regulation output square wave.
In a kind of possible implementation, the circuit also includes：Electric capacity C4, the electric capacity C4 first end and the light
Coupling D1 colelctor electrode is connected, the second end ground connection of the electric capacity C4.Electric capacity C4 is mainly strobed, and letter is done to output class square wave
Single filtering.
In a kind of possible implementation, the resistance R includes resistance R3, resistance R4, resistance R6, resistance R7, resistance
R8, the resistance R3, resistance R4, resistance R6, resistance R7, resistance R8 are serially connected.
In a kind of possible implementation, the electric capacity C includes electric capacity C2, electric capacity C3, the electric capacity C2 and the electricity
Hold C3 in parallel.
In a kind of possible implementation, the diode VD1 is voltage-regulator diode.
The workflow to zero-crossing detection circuit of power line carrier of the present utility model is described in detail below：
During live wire L point alternating voltages are by negative become just, after 220V alternating currents are depressured through R1, R3, R4, R6, R7, R8
Triode VT1, VT2 conducting are driven, while optocoupler D1 is turned on after being depressured through R1, C1, VD1, CLK50_IA output low levels.Resistance
R3, R4, R6, R7, R8 resistance can be properly increased, but if resistance, which crosses conference, causes the electricity by R3, R4, R6, R7, R8
Flow through small, C2, C3 charging interval are long, and VT1, VT2 are unable to normally.As alternating voltage is by the positive process of negative change, voltage
Value is improved constantly, and VT1 base voltages are also improved constantly after being depressured through R1, R3, R4, R6, R7, R8, are led when more than VT1, VT2 base stage
VT1, VT2 will be turned on after the pressure that is powered.In the utility model, if R1 is individually depressured, alternating voltage is dropped into optocoupler
It is higher to resistance R1 power requirement if D1 normal working voltages, cause resistance R1 sufficiently bulky, power consumption is also very big, and
R1, C1 are depressured simultaneously voltage to drop to suitable scope under the premise of control resistance power consumption and volume, and VD1 is the pole of voltage stabilizing two
Pipe, is clamped the voltage in certain limit, it is ensured that optocoupler D1 normal works.
When L point alternating voltages by peak to zero axle during, triode VT1, VT2 cut-off, optocoupler D1 cut-off,
CLK50_IA exports high level；As shown in Fig. 2 the output waveform that square wave is output port CLK50_IA is (when alternating current is by negative change
Positive near zero-crossing point, one low level of optocoupler D1 conducting outputs), sine wave is ac power waveform.
The zero crossing of CLK50_IA level transition point closely alternating current, for completing zero passage detection；R1 is power
Resistance has certain Anti-surging characteristic, improves the stabilization and security of whole circuit；C2, C3 energy storage ensure optocoupler and triode
Stable normally, while the time delay for detecting zero crossing can be adjusted by adjusting the capacitance size；In the utility model
In, electric capacity C2, C3 parallel connection is in order to improve capacitance, to be also convenient for adjusting prolonging for the zero crossing that detects by capacitance value
The slow time, afterflow effect is played when optocoupler is turned on.The size of C2, C3 capacitance determines that two electric capacity chargings (ensure optocoupler
D1 normallies) the time required to length, and the effective charging process of electric capacity is when sine wave is by zero point, therefore fill
The length of electric time determine CLK50_IA ports when exporting low level with time difference of actual zero crossing, that is, the zero passage detected
The time delay of point.
VD2, which provides loop, prevents VT1, VT2 reverse breakdown, alternating current by it is positive become negative during, zero line N-terminal voltage it is high and
Live wire L terminal voltages are low, and VD2 conductings, VD2 both end voltages about 0.7V, for protecting VT1, VT2, prevents VT1, VT2 from reversely hitting
Wear.If without VD2, ac voltage (because VT1, VT2 cut-off) is directly born between VT1 base stages and VT2 transmitting bases easily anti-
To puncturing.Optocoupler D1 plays strong and weak electric isolution, solves isolating problem；Whole circuit is with low cost all using passive device.
Zero-crossing detection circuit of power line carrier of the present utility model, is directly adjusted by the capacitance size for adjusting storage capacitor
Delay size between the zero crossing detected and actual zero point, more accurately detects zero crossing, while reducing cost
The security, reliability, anti-interference of circuit are improved, power consumption is also reduced.Power line carrier zero passage inspection of the present utility model
Slowdown monitoring circuit can be realized：Zero crossing is accurately detected in the delay of near zero-crossing point very short time；Power is electrically isolated, and elimination is used
In Danger Electric shock risk；Low-power consumption, can greatly improve product efficiency, the problems such as being generated heat without extra process；Strong interference immunity, is applicable
Scope is wide, can preferably adapt to power line load changing, solve the problems, such as false triggering；It is with low cost, take PCB surface and accumulate small, fit
With production in enormous quantities.
The foregoing description to specific illustrative embodiment of the present utility model be in order to illustrate and illustration purpose.These
Description is not wishing to being defined to the utility model into disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explaining certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and a variety of selections and change.Scope of the present utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (7)
1. a kind of zero-crossing detection circuit of power line carrier, it is characterised in that including：Resistance R1, electric capacity C1, resistance R, diode
VD1, diode VD2, electric capacity C, triode VT1, triode VT2, optocoupler D1, the first end of the resistance R1 are connected with live wire,
The second end of the resistance R1 is connected with the first end of the electric capacity C1, the first end of the resistance R；
The second end of the electric capacity C1, the negative pole of the diode VD1, the first end of the electric capacity C, the anode of the optocoupler D1
It is respectively connected with, the positive pole of the diode VD1, the second end of the electric capacity C, the positive pole of the diode VD2, the triode
VT2 emitter stage is connected with live wire respectively；
The second end of the resistance R, the negative pole of the diode VD2, the base stage of the triode VT1 are respectively connected with；
The emitter stage of the triode VT1 is connected with the base stage of the triode VT2, the colelctor electrode of the triode VT1 and institute
Triode VT2 colelctor electrode, the negative electrode of the optocoupler D1 is stated to be respectively connected with；
The colelctor electrode of the optocoupler D1 is connected with supply voltage VCC, the grounded emitter of the optocoupler D1.
2. zero-crossing detection circuit of power line carrier according to claim 1, it is characterised in that the circuit also includes：Resistance
R2, the first end of the resistance R2 is connected with the second end of the electric capacity C1, the second end of the resistance R2 and the optocoupler D1
Anode be connected.
3. zero-crossing detection circuit of power line carrier according to claim 1, it is characterised in that the circuit also includes：Resistance
R5, the optocoupler D1 colelctor electrode are connected by the resistance R5 with the supply voltage VCC.
4. zero-crossing detection circuit of power line carrier according to claim 1, it is characterised in that the circuit also includes：Electric capacity
C4, the first end of the electric capacity C4 is connected with the colelctor electrode of the optocoupler D1, the second end ground connection of the electric capacity C4.
5. zero-crossing detection circuit of power line carrier according to claim 1, it is characterised in that the resistance R includes resistance
R3, resistance R4, resistance R6, resistance R7, resistance R8, the resistance R3, resistance R4, resistance R6, resistance R7, resistance R8 mutually go here and there
Connection.
6. zero-crossing detection circuit of power line carrier according to claim 1, it is characterised in that the electric capacity C includes electric capacity
C2, electric capacity C3, the electric capacity C2 are in parallel with the electric capacity C3.
7. zero-crossing detection circuit of power line carrier according to claim 1, it is characterised in that the diode VD1 is steady
Press diode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720367737.6U CN206618797U (en) | 2017-04-10 | 2017-04-10 | A kind of zero-crossing detection circuit of power line carrier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720367737.6U CN206618797U (en) | 2017-04-10 | 2017-04-10 | A kind of zero-crossing detection circuit of power line carrier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781417A (en) * | 2020-07-17 | 2020-10-16 | 四川长虹空调有限公司 | Zero-crossing detection circuit and method |
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2017
- 2017-04-10 CN CN201720367737.6U patent/CN206618797U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781417A (en) * | 2020-07-17 | 2020-10-16 | 四川长虹空调有限公司 | Zero-crossing detection circuit and method |
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