CN203688646U - Zero crossing detection circuit - Google Patents

Zero crossing detection circuit Download PDF

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Publication number
CN203688646U
CN203688646U CN201420040309.9U CN201420040309U CN203688646U CN 203688646 U CN203688646 U CN 203688646U CN 201420040309 U CN201420040309 U CN 201420040309U CN 203688646 U CN203688646 U CN 203688646U
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input
zero
power supply
resistance
unit
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CN201420040309.9U
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林子其
何乐涛
王龙和
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Shenzhen Kaifa Technology Co Ltd
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Shenzhen Kaifa Technology Co Ltd
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Abstract

A zero crossing detection circuit includes a power supply unit, a zero crossing detection unit and an isolation output unit. The power supply unit is used for converting a high-voltage alternating-current voltage into a direct-current voltage, wherein an input end of the power supply unit is connected with a live wire of a high-voltage alternating-current power source while an output end of the power supply unit outputs a direct-current voltage; and a first voltage step-down capacitor is connected between the input end and the output end of the power supply unit. The zero crossing detection circuit is used for detecting a zero crossing point of the alternating-current power source, and is connected with a live wire and a neutral wire of the alternating-current power source. The isolation output unit is used for isolating the alternating-current power source and a subordinate circuit, wherein a first input end of the isolation output unit is connected with the output end of the power supply unit, a second input end of the isolation output unit is connected with an output end of the zero crossing detection unit, and an output end of the isolation output unit outputs a zero crossing detection signal. The zero crossing detection circuit can help to reduce power consumption, has strong anti-interference capability, can work stably and reliably in power grid interference, fluctuation and environmental changes, is structurally simple, and is low in cost.

Description

Zero cross detection circuit
Technical field
The utility model relates to testing circuit, relates in particular to zero cross detection circuit.
Background technology
At present, the development of intelligent grid is very swift and violent.Power carrier communication technology is widely used in intelligent long-distance meterage system.This communication modes needs the zero crossing that accurately detects alternating current on line of electric force to realize good communication.Mostly existing zero cross detection circuit is to obtain zero crossing by the mode of electric resistance partial pressure or stabilivolt, although this method easily realizes, cost is lower, poor aspect electrical isolation and antijamming capability; Some zero cross detection circuits need power source special to power to it, cost is high, complex structure, take up room large; Though not needing of having be with power source special power supply, and adopt RC mode from electrical network power taking, due to resistance at work constantly power consumption cause power consumption larger; What have is directly connected in series current-limiting resistance on line of electric force, directly drives optocoupler, detects zero cross signal, and which is simple in structure, can play buffer action, but is also that power consumption is larger, and signal exists skew.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of zero cross detection circuit is proposed, it can solve, and the zero cross detection circuit electrical isolation of prior art and poor anti jamming capability, cost are high, complex structure and the large problem of power consumption.
For solving the problems of the technologies described above, the utility model proposes a kind of zero cross detection circuit, it comprises: power supply unit, it is for being converted to DC voltage High AC voltage, it comprises: input end, output terminal and the first decompression capacitor, the input end of power supply unit connects the live wire of high-voltage ac power, and the output terminal of power supply unit is exported a DC voltage, and the first decompression capacitor is connected between the input end and output terminal of power supply unit; Zero passage detection unit, it is for detection of the zero crossing of AC power, it comprises: first input end, the second input end and output terminal, and the first input end of zero passage detection unit connects the live wire of AC power, and the second input end of zero passage detection unit connects the zero line of AC power; Isolation output unit, it is for isolating AC power and subordinate's circuit, its output zero passage detection signal, it comprises: first input end, the second input end and output terminal, the first input end of isolation output unit connects the output terminal of power supply unit, the second input end of isolation output unit connects the output terminal of zero passage detection unit, the output terminal output zero passage detection signal of isolation output unit, and zero passage detection signal is pulse signal.
Preferably, power supply unit also comprises that string is located at commutation diode and the current-limiting resistance between the first decompression capacitor and the output terminal of power supply unit, and the positive pole of commutation diode is connected with the first decompression capacitor.
Preferably, power supply unit also comprises that string is located at the Transient Suppression Diode between live wire and the zero line of high-voltage ac power, and the negative pole of Transient Suppression Diode is connected with the first decompression capacitor.
Preferably, power supply unit also comprises that string is located at the second decompression capacitor between live wire and the zero line of high-voltage ac power, and the second decompression capacitor comprises multiple electric capacity parallel with one another.
Preferably, zero passage detection unit comprises resistance-capacitance depressurization subelement and the signal processing subelement being connected with resistance-capacitance depressurization subelement, wherein, this resistance-capacitance depressurization subelement further comprises dropping resistor and the decompression capacitor between live wire and the zero line that is mutually in series arranged on high-voltage ac power, and the tie point of dropping resistor and decompression capacitor is the output terminal of this resistance-capacitance depressurization subelement.
Preferably, dropping resistor comprises the resistance of multiple mutual series connection.
Preferably, signal is processed two triodes that subelement comprises mutual cascade, and the first input end that signal is processed subelement is connected with the output terminal of resistance-capacitance depressurization subelement, and the second input end that signal is processed subelement is connected with the second input end of isolation output unit.
Preferably, this resistance-capacitance depressurization subelement further comprises the diode for reverse protection, and the positive pole of diode is connected with the zero line of high-voltage ac power, and the negative pole of diode is connected with the output terminal of resistance-capacitance depressurization subelement.
Preferably, isolation output unit comprises photoelectric coupled circuit, photoelectric coupled circuit comprises that the positive pole of photodiode forms the first input end of isolation output unit as the photodiode of input with as the phototriode of exporting, and the negative pole of photodiode forms the second input end of isolation output unit.
Preferably, isolation output unit also comprises the driving circuit being connected with photoelectric coupled circuit, and driving circuit comprises triode, and the base stage of triode is connected with the phototriode of photoelectric coupled circuit.
Compared with prior art, the utlity model has following beneficial effect: zero cross detection circuit of the present utility model, adopt decompression capacitor step-down, there are more low-power consumption and stronger antijamming capability with respect to existing similar circuit, can reliable and stable work in electrical network interference, fluctuation and environmental change, and circuit is simple, cost is lower.
Accompanying drawing explanation
Fig. 1 is the structural representation of zero cross detection circuit of the present utility model.
Fig. 2 is input and the output waveform of the utility model zero cross detection circuit embodiment.
Wherein, description of reference numerals is as follows: power supply unit 1 first decompression capacitor C5 commutation diode D37 current-limiting resistance R1 Transient Suppression Diode Z1 capacitor C 1 capacitor C 2 capacitor C 3 capacitor C 4 zero passage detection unit 2 resistance-capacitance depressurization subelement 21 decompression capacitor C6 diode D5 resistance R 14 resistance R 15 resistance R 16 signals are processed subelement 22 triode Q2 triode Q3 resistance R 17 resistance R 13 and isolated output unit 3 photoelectric coupled circuit U1 resistance R 9 triode Q1 resistance R 5 resistance R 4.
Embodiment
In order to further illustrate principle of the present utility model and structure, now by reference to the accompanying drawings preferred embodiment of the present utility model is elaborated.
zero cross detection circuit embodiment
Refer to Fig. 1, a kind of zero cross detection circuit, it comprises: power supply unit 1, zero passage detection unit 2, isolation output unit 3.
Power supply unit 1 comprises: input end, output terminal and the first decompression capacitor.Zero passage detection unit 2 comprises: first input end, the second input end and output terminal.Isolation output unit 3 comprises: first input end, the second input end and output terminal.
The input end of power supply unit 1 connects the live wire of high-voltage ac power, and the output terminal of power supply unit 1 is exported a DC voltage, and the first decompression capacitor is connected between the input end and output terminal of power supply unit 1.The first input end of zero passage detection unit 2 connects the live wire of AC power, and the second input end of zero passage detection unit 2 connects the zero line of AC power.The first input end of isolation output unit 3 connects the output terminal of power supply unit 1, the second input end of isolation output unit 3 connects the output terminal of zero passage detection unit 2, the output terminal output zero passage detection signal of isolation output unit 3, zero passage detection signal is pulse signal.
Power supply unit 1 is for High AC voltage is converted to DC voltage, and zero passage detection unit 2 is for detection of the zero crossing of AC power, and isolation output unit 3 is for isolating AC power and subordinate's circuit, and it exports zero passage detection signal.
Power supply unit 1 also comprises: commutation diode D37, current-limiting resistance R1, Transient Suppression Diode Z1 and the second decompression capacitor.
Commutation diode D37 and current-limiting resistance R1 string are located between the first decompression capacitor C5 and the output terminal of power supply unit 1, and the positive pole of commutation diode D37 is connected with the first decompression capacitor C5.Transient Suppression Diode Z1 string is located between the live wire and zero line of high-voltage ac power, and the negative pole of Transient Suppression Diode Z1 is connected with the first decompression capacitor C5.The second decompression capacitor string is located between the live wire and zero line of high-voltage ac power, and the second decompression capacitor comprises multiple capacitor C 1, C2, C3, C4 parallel with one another.
In the present embodiment, the magnitude of voltage of DC voltage is 6V.Transient Suppression Diode Z1 plays the effect of clamper, pressure limiting, has limited the voltage of capacitor C 1, capacitor C 2, capacitor C 3 and capacitor C 4.Adopt Transient Suppression Diode Z1 can resist the various interference above electrical network, be not easy to damage.Diode D37 resistance R 1 below can play metering function, the surge current while reducing diode current flow.
Power supply unit 1 of the present utility model, by the first decompression capacitor C5, is obtained the direct supply of a general 6V to subordinate's circuit supply in AC network.Existing similar techniques is to adopt the mode of resistance step-down, current limliting on alternating current, to obtain DC source, but resistance itself is continuous consumes power at work, cause power consumption larger, and adopt the mode of resistance step-down, current limliting power taking, in the time of variation of ambient temperature, voltage ripple of power network or lower voltage, be easily interfered, cause output distortion.And the utility model can keep low-power consumption after having adopted the first decompression capacitor C5, and antijamming capability is strong, is subject to the interference of variation of ambient temperature, voltage ripple of power network also little.
Zero passage detection unit 2 comprises resistance-capacitance depressurization subelement 21 and the signal processing subelement 22 being connected with resistance-capacitance depressurization subelement 21.
This resistance-capacitance depressurization subelement 21 further comprises dropping resistor, decompression capacitor C6 and the diode D5 for reverse protection.Dropping resistor and decompression capacitor are in series arranged between the live wire and zero line of high-voltage ac power mutually, and the tie point of dropping resistor and decompression capacitor is the output terminal of this resistance-capacitance depressurization subelement 21.The positive pole of diode is connected with the zero line of high-voltage ac power, and the negative pole of diode is connected with the output terminal of resistance-capacitance depressurization subelement 21.Wherein, dropping resistor comprises resistance R 14, R15, the R16 of multiple mutual series connection.
Signal is processed two triode Q2, Q3, resistance R 17 and the resistance R 13 that subelement 22 comprises mutual cascade.The first input end that signal is processed subelement 22 is connected with the output terminal of resistance-capacitance depressurization subelement 21, and the second input end that signal is processed subelement 22 is connected with the second input end of isolation output unit 3.Be specially, resistance R 17 is connected to signal and processes between the first input end of subelement 22 and the base stage of triode Q3, resistance R 13 is connected between the output terminal of power supply unit 1 and the collector of triode Q3, the grounded emitter of triode Q3, the collector of the base stage connecting triode Q3 of triode Q2, the collector of triode Q2 connects the second input end of signal processing subelement 22, the grounded emitter of triode Q2.
In the present embodiment, resistance R 14, resistance R 15, resistance R 16 and resistance R 17 play dividing potential drop metering function, simultaneously and capacitor C 6 form RC filtering, various interference that can be above elimination line of electric force.Diode D5 is voltage reversal protective effect, in order to avoid triode Q3 is damaged.
The driving circuit that isolation output unit 3 comprises photoelectric coupled circuit U1 and is connected with photoelectric coupled circuit.Photoelectric coupled circuit U1 comprises as the photodiode of input, as phototriode and the resistance R 9 exported, the positive pole of photodiode forms the first input end of isolation output unit 3, the negative pole of photodiode forms the second input end of isolation output unit 3, and resistance R 9 is connected between the output terminal of power supply unit 1 and the positive pole of photodiode.Driving circuit comprises triode Q1, resistance R 4 and resistance R 5, and the base stage of triode is connected with the phototriode of photoelectric coupled circuit.Resistance R 4 is connected between the base stage of triode Q1 and the power supply of 3.3V, and resistance R 5 is connected between the collector of triode Q1 and the power supply of 3.3V, the grounded emitter of triode Q1.
Refer to Fig. 2, the synchronous waveform of the waveform of exporting by zero cross detection circuit of the present utility model alternating current on line of electric force, approaches without skew, and waveform duty cycle is 50%.
Compared with prior art, the utlity model has following beneficial effect: zero cross detection circuit of the present utility model, adopt capacitance decompression, there are more low-power consumption and stronger antijamming capability with respect to existing similar circuit, can reliable and stable work in electrical network interference, fluctuation and environmental change, be embodied in: 1, fast response time; 2, with respect to the testing circuit of various band isolation in the past, power consumption is lower; 3, antijamming capability is strong, all can normally detect signal even be reduced to volt more than 30 at power voltage line; 4, affected by the factors such as environment temperature little, at-40 degrees Celsius to+85 degrees Celsius, working stability, reliable; 5, realize the isolation of high-voltage power line and weak electricity measuring system, effectively avoiding getting an electric shock occurs, and guarantees personal safety; 6, without increase power source special in high-pressure side, this circuit can self-powered; 7, circuit is simple, and cost is lower.
These are only better possible embodiments of the present utility model, and unrestricted protection domain of the present utility model, the equivalent structure that all utilization the utility model instructionss and accompanying drawing content have been done changes, and is all included in protection domain of the present utility model.

Claims (10)

1. a zero cross detection circuit, is characterized in that, it comprises:
Power supply unit, it is for being converted to DC voltage High AC voltage, it comprises: input end, output terminal and the first decompression capacitor, the input end of described power supply unit connects the live wire of described high-voltage ac power, DC voltage described in the output terminal output one of described power supply unit, described the first decompression capacitor is connected between the input end and output terminal of described power supply unit;
Zero passage detection unit, it is for detection of the zero crossing of described AC power, it comprises: first input end, the second input end and output terminal, the first input end of described zero passage detection unit connects the live wire of described AC power, and the second input end of described zero passage detection unit connects the zero line of described AC power;
Isolation output unit, it is for isolating described AC power and subordinate's circuit, its output zero passage detection signal, it comprises: first input end, the second input end and output terminal, the first input end of described isolation output unit connects the output terminal of described power supply unit, the second input end of described isolation output unit connects the output terminal of described zero passage detection unit, and the output terminal of described isolation output unit is exported described zero passage detection signal, and described zero passage detection signal is pulse signal.
2. zero cross detection circuit as claimed in claim 1, it is characterized in that, described power supply unit also comprises that string is located at commutation diode and the current-limiting resistance between described the first decompression capacitor and the output terminal of described power supply unit, and the positive pole of described commutation diode is connected with described the first decompression capacitor.
3. zero cross detection circuit as claimed in claim 2, it is characterized in that, described power supply unit also comprises that string is located at the Transient Suppression Diode between live wire and the zero line of described high-voltage ac power, and the negative pole of described Transient Suppression Diode is connected with described the first decompression capacitor.
4. zero cross detection circuit as claimed in claim 3, is characterized in that, described power supply unit also comprises that string is located at the second decompression capacitor between live wire and the zero line of described high-voltage ac power, and described the second decompression capacitor comprises multiple electric capacity parallel with one another.
5. zero cross detection circuit as claimed in claim 1, it is characterized in that, described zero passage detection unit comprises resistance-capacitance depressurization subelement and the signal processing subelement being connected with described resistance-capacitance depressurization subelement, wherein, this resistance-capacitance depressurization subelement further comprises dropping resistor and the decompression capacitor between live wire and the zero line that is mutually in series arranged on described high-voltage ac power, and the tie point of described dropping resistor and decompression capacitor is the output terminal of this resistance-capacitance depressurization subelement.
6. zero cross detection circuit as claimed in claim 5, is characterized in that, described dropping resistor comprises the resistance of multiple mutual series connection.
7. zero cross detection circuit as claimed in claim 5, it is characterized in that, described signal is processed two triodes that subelement comprises mutual cascade, the first input end that described signal is processed subelement is connected with the output terminal of described resistance-capacitance depressurization subelement, and described signal is processed the second input end of subelement and the second input end of described isolation output unit is connected.
8. zero cross detection circuit as claimed in claim 5; it is characterized in that; this resistance-capacitance depressurization subelement further comprises the diode for reverse protection; the positive pole of described diode is connected with the zero line of described high-voltage ac power, and the negative pole of described diode is connected with the output terminal of described resistance-capacitance depressurization subelement.
9. zero cross detection circuit as claimed in claim 1, it is characterized in that, described isolation output unit comprises photoelectric coupled circuit, described photoelectric coupled circuit comprises as the photodiode of input with as the phototriode of exporting, the positive pole of described photodiode forms the first input end of isolation output unit, and the negative pole of described photodiode forms the second input end of isolation output unit.
10. zero cross detection circuit as claimed in claim 9, it is characterized in that, described isolation output unit also comprises the driving circuit being connected with described photoelectric coupled circuit, and described driving circuit comprises triode, and the base stage of described triode is connected with the phototriode of described photoelectric coupled circuit.
CN201420040309.9U 2014-01-22 2014-01-22 Zero crossing detection circuit Active CN203688646U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698262A (en) * 2015-03-04 2015-06-10 广东美的制冷设备有限公司 Zero cross detection circuit and variable frequency air conditioner
CN106501587A (en) * 2016-11-04 2017-03-15 青岛新芯智能电子科技有限公司 Isolated accurate zero cross detection circuit
CN108680784A (en) * 2018-05-17 2018-10-19 深圳市共进电子股份有限公司 Zero cross detection circuit
CN109061278A (en) * 2018-06-19 2018-12-21 飞雕电器集团有限公司 A kind of zero cross detection circuit of super low-power consumption

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698262A (en) * 2015-03-04 2015-06-10 广东美的制冷设备有限公司 Zero cross detection circuit and variable frequency air conditioner
CN104698262B (en) * 2015-03-04 2017-06-09 广东美的制冷设备有限公司 A kind of zero cross detection circuit and convertible frequency air-conditioner
CN106501587A (en) * 2016-11-04 2017-03-15 青岛新芯智能电子科技有限公司 Isolated accurate zero cross detection circuit
CN108680784A (en) * 2018-05-17 2018-10-19 深圳市共进电子股份有限公司 Zero cross detection circuit
CN109061278A (en) * 2018-06-19 2018-12-21 飞雕电器集团有限公司 A kind of zero cross detection circuit of super low-power consumption
CN109061278B (en) * 2018-06-19 2020-11-13 飞雕电器集团有限公司 Zero-crossing detection circuit with ultralow power consumption

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