CN210803576U - Three-phase alternating current zero-crossing detection circuit based on optical coupling isolation - Google Patents
Three-phase alternating current zero-crossing detection circuit based on optical coupling isolation Download PDFInfo
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- CN210803576U CN210803576U CN201920798566.1U CN201920798566U CN210803576U CN 210803576 U CN210803576 U CN 210803576U CN 201920798566 U CN201920798566 U CN 201920798566U CN 210803576 U CN210803576 U CN 210803576U
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Abstract
The utility model discloses a three-phase alternating current zero-crossing detection circuit based on optical coupling isolation, including the protection circuit who is connected with three-phase alternating current power supply, the protection circuit is connected with optical coupling circuit, optical coupling circuit is connected with signal output circuit, signal output circuit links to each other with the singlechip; the voltage of three-phase alternating current power supply passes through protection circuit and is connected with opto-coupler coupling circuit, and opto-coupler coupling circuit turns into 220V's alternating current into the control signal to signal output circuit through keeping apart the conversion, and signal output circuit output and the same high low level signal of input alternating current frequency, singlechip are through the detection to high low level, calculate the zero crossing point moment of alternating current, and the pulsation signal voltage error that can greatly reduced detect measures accurately measures the zero crossing point of alternating current, the utility model discloses can be used for the zero crossing point of alternating current to detect.
Description
Technical Field
The utility model relates to a detection circuit.
Background art:
zero-crossing detection is to detect the zero-crossing point moment of the alternating current by using an electronic circuit. The existing traditional detection method is realized by adopting a hardware zero-crossing comparator, the circuit of the method is complex, the comparator can realize the detection of a zero-crossing signal only by double power supplies, and an optical coupler is also used, namely, when the waveform is converted from a positive half cycle to a negative half cycle through resistance voltage division and passes through a zero position, a pulse signal voltage is taken out. The alternating current zero-crossing detection circuit is single in circuit, the voltage error of the detected pulse signal is large, and the zero crossing point of the alternating current cannot be accurately detected. Therefore, the simple and accurate zero-crossing detection circuit and the detection method thereof are of great significance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a three-phase alternating current zero passage detection circuit based on opto-coupler isolation, the zero crossing of alternating current is measured accurately to the pulsating signal voltage error that can greatly reduced detect.
In order to achieve the above object, the utility model provides a three-phase alternating current zero cross detection circuit based on opto-coupler isolation, include the protection circuit who is connected with three-phase alternating current power supply, protection circuit and opto-coupler coupling circuit are connected, opto-coupler coupling circuit and signal output circuit are connected, signal output circuit links to each other with the singlechip.
Compared with the prior art, the beneficial effects of the utility model reside in that, the voltage of three-phase alternating current power supply passes through protection circuit and opto-coupler coupling circuit connection, opto-coupler coupling circuit turns into 220V's alternating current into the control signal to signal output circuit through keeping apart the conversion, signal output circuit output and the same high low level signal of input alternating current frequency, the singlechip is through the detection to high low level, calculates the zero crossing point moment of alternating current, the pulsating signal voltage error that can greatly reduced detect, accurately measures the zero crossing point of alternating current, the utility model discloses can be used for the zero crossing point of alternating current to detect.
As a further improvement of the present invention, the optical coupling circuit includes a photocoupler U1A, a photocoupler U1B and a photocoupler U1C, an input of the photocoupler U1A, an input of the photocoupler U1B and an input of the photocoupler U1C are connected to the protection circuit, and a collector of an output end of the photocoupler U1A, a collector of an output end of the photocoupler U1B and a collector of an output end of the photocoupler U1C are connected to the 5V power supply; the output end of the photoelectric coupler U1A, the output end of the photoelectric coupler U1B and the output end of the photoelectric coupler U1C are connected with a signal output circuit; the emitting stage of the output end of the photoelectric coupler U1A is connected in series with the resistor R4 and is grounded, the emitting stage of the output end of the photoelectric coupler U1B is connected in series with the resistor R7 and is grounded, and the emitting stage of the output end of the photoelectric coupler U1C is connected in series with the resistor R6 and is grounded, so that alternating current can be better converted into a control signal for a signal input circuit through the photoelectric coupler, and the signal input circuit is more accurately switched on and switched off.
As a further improvement of the present invention, the signal circuit output circuit includes a switching transistor Q1, a switching transistor Q2, and a switching transistor Q3; the base electrode of the switching triode Q1 is connected with the emitter of the output end of the photoelectric coupler U1A, the collector electrode of the switching triode Q1 is connected with the 5V power supply, and the emitter of the switching triode Q1 is connected with the resistor R5 in series and is grounded; the base electrode of the switching triode Q2 is connected with the emitter of the output end of the photoelectric coupler U1B, the collector electrode of the switching triode Q2 is connected with the 5V power supply, and the emitter of the switching triode Q2 is connected with the resistor R8 in series and is grounded; the base electrode of the switching triode Q3 is connected with the emitter of the output end of the photoelectric coupler U1C, the collector electrode of the switching triode Q3 is connected with the 5V power supply, and the emitter of the switching triode Q3 is connected with the resistor R9 in series and is grounded; the output ends of the resistor R5, the resistor R8 and the resistor R9 are connected with the single chip microcomputer, so that the voltages of the resistors R5, R8 and R9 serve as signal voltages for the single chip microcomputer to detect the zero crossing of the three-phase alternating current, the switching triode outputs high and low level signals with the same frequency as the input alternating current, the single chip microcomputer calculates the zero crossing point time of the alternating current through detecting the high and low levels output by the switching triode, the detection precision is further improved, and errors are reduced.
As a further improvement of the present invention, the protection circuit includes a diode D1, a diode D2, and a diode D3, the negative electrode of the diode D1 is connected to the positive electrode of the input terminal of the photocoupler U1A, the positive electrode of the diode D1 is connected to the negative electrode of the input terminal of the photocoupler U1A, the negative electrode of the diode D2 is connected to the positive electrode of the input terminal of the photocoupler U1B, the positive electrode of the diode D2 is connected to the negative electrode of the input terminal of the photocoupler U1B, the negative electrode of the diode D3 is connected to the positive electrode of the input terminal of the photocoupler U1C, the positive electrode of the diode D3 is connected to the negative electrode of the input terminal of the photocoupler U1C, so that the diode is turned on when the ac circuit is in the negative half cycle, and the photocoupler is prevented from being reversely broken down.
As a further improvement of the utility model, the protection circuit still includes current-limiting resistor R1, current-limiting resistor R2 and current-limiting resistor R3, current-limiting resistor R1's one end is continuous with the three-phase alternating current power supply, current-limiting resistor R1's the other end links to each other with diode D1's negative pole, current-limiting resistor R2's one end links to each other with the three-phase alternating current power supply, current-limiting resistor R2's the other end links to each other with diode D2's negative pole, current-limiting resistor R3's one end is continuous with the three-phase alternating current power supply, current-limiting resistor R1's the other end links to each other with diode D3's negative pole, prevents the electric current too big.
As a further improvement of the utility model, the emitter of switch triode Q1 links to each other with oscilloscope's A + interface, oscilloscope's A-interface ground connection can carry out real-time detection to signal waveform through oscilloscope like this.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a waveform diagram of the present invention.
Detailed Description
The optical coupling isolation-based three-phase alternating current zero-crossing detection circuit comprises a protection circuit connected with a three-phase alternating current power supply, the protection circuit is connected with an optical coupling circuit, the optical coupling circuit is connected with a signal output circuit, and the signal output circuit is connected with a single chip microcomputer.
The optical coupling circuit comprises a photoelectric coupler U1A, a photoelectric coupler U1B and a photoelectric coupler U1C, the input end of the photoelectric coupler U1A, the input end of the photoelectric coupler U1B and the input end of the photoelectric coupler U1C are connected with the protection circuit, and the collector of the output end of the photoelectric coupler U1A, the collector of the output end of the photoelectric coupler U1B and the collector of the output end of the photoelectric coupler U1C are connected with a 5V power supply; the output end of the photoelectric coupler U1A, the output end of the photoelectric coupler U1B and the output end of the photoelectric coupler U1C are connected with a signal output circuit; the emitting stage of the output end of the photoelectric coupler U1A is connected in series with the resistor R4 and is grounded, the emitting stage of the output end of the photoelectric coupler U1B is connected in series with the resistor R7 and is grounded, and the emitting stage of the output end of the photoelectric coupler U1C is connected in series with the resistor R6 and is grounded.
The signal circuit output circuit comprises a switching triode Q1, a switching triode Q2 and a switching triode Q3; the base electrode of the switching triode Q1 is connected with the emitter of the output end of the photoelectric coupler U1A, the collector electrode of the switching triode Q1 is connected with the 5V power supply, and the emitter of the switching triode Q1 is connected with the resistor R5 in series and is grounded; the base electrode of the switching triode Q2 is connected with the emitter of the output end of the photoelectric coupler U1B, the collector electrode of the switching triode Q2 is connected with the 5V power supply, and the emitter of the switching triode Q2 is connected with the resistor R8 in series and is grounded; the base electrode of the switching triode Q3 is connected with the emitter of the output end of the photoelectric coupler U1C, the collector electrode of the switching triode Q3 is connected with the 5V power supply, and the emitter of the switching triode Q3 is connected with the resistor R9 in series and is grounded; the output ends of the resistor R5, the resistor R8 and the resistor R9 are connected with the singlechip.
The protection circuit comprises a diode D1, a diode D2 and a diode D3, wherein the cathode of the diode D1 is connected with the anode of the input end of the photoelectric coupler U1A, the anode of the diode D1 is connected with the cathode of the input end of the photoelectric coupler U1A, the cathode of the diode D2 is connected with the anode of the input end of the photoelectric coupler U1B, the anode of the diode D2 is connected with the cathode of the input end of the photoelectric coupler U1B, the cathode of the diode D3 is connected with the anode of the input end of the photoelectric coupler U1C, and the anode of the diode D3 is connected with the cathode of the input end of the photoelectric coupler U1C.
The protection circuit further comprises a current-limiting resistor R1, a current-limiting resistor R2 and a current-limiting resistor R3, wherein one end of the current-limiting resistor R1 is connected with a three-phase alternating current power supply, the other end of the current-limiting resistor R1 is connected with the negative electrode of a diode D1, one end of a current-limiting resistor R2 is connected with the three-phase alternating current power supply, the other end of the current-limiting resistor R2 is connected with the negative electrode of a diode D2, one end of the current-limiting resistor R3 is connected with the three-phase alternating current power supply, and the other end of the current-; the emitter of the switching triode Q1 is connected with the A + interface of the oscilloscope, and the A-interface of the oscilloscope is grounded.
When the photoelectric coupler works, the current limiting resistors R1, R2 and R3 carry out current limiting and voltage dividing, and working point bias voltage is provided for the photoelectric couplers U1A, U1B and U1C; when the alternating current is in the negative half cycle, the diodes D1, D2 and D3 are conducted, the photoelectric coupler is cut off, and the photoelectric coupler is prevented from being reversely broken down; through the isolation conversion of the photoelectric coupler, the photoelectric coupler converts the 220V alternating current into a control signal for the switching triode, and controls the conduction and the cut-off of the switching triode; through the conduction and the cut-off of the switching triode, the switching triode outputs high and low level signals which can be detected by the singlechip, when the alternating current is positive half cycle, the output of the zero-crossing detection circuit is high level, and when the alternating current is negative half cycle, the output of the zero-crossing detection circuit is low level; in one period of the zero-crossing detection circuit, the singlechip detects the high and low levels of the zero-crossing detection circuit. Setting the time of the level from low to high as 0 point and the level from high to low as t point in one period1At the moment t, the level is again low to high2The time of day.
Thus alternating current for one cycle:
T＝t2；
positive peak time in the sine wave of this one period
The obtained alternating current zero point moment is as follows:
in the same way, the detection principle of the phase B and the phase C in the three-phase alternating current is the same as that of the phase A.
The present invention is not limited to the above embodiments, and based on the technical solutions of the present disclosure, those skilled in the art can make some substitutions and transformations to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and transformations are all within the protection scope of the present invention.
Claims (6)
1. The utility model provides a three-phase alternating current zero passage detection circuit based on optical coupling isolation which characterized in that: the protection circuit is connected with an optical coupling circuit, the optical coupling circuit is connected with a signal output circuit, and the signal output circuit is connected with a single chip microcomputer.
2. The optical coupling isolation-based three-phase alternating current zero-crossing detection circuit as claimed in claim 1, wherein: the optical coupling circuit comprises an optical coupler U1A, an optical coupler U1B and an optical coupler U1C, the input end of the optical coupler U1A, the input end of the optical coupler U1B and the input end of the optical coupler U1C are connected with a protection circuit, and a collector of the output end of the optical coupler U1A, a collector of the output end of the optical coupler U1B and a collector of the output end of the optical coupler U1C are connected with a 5V power supply;
the output end of the photoelectric coupler U1A, the output end of the photoelectric coupler U1B and the output end of the photoelectric coupler U1C are connected with a signal output circuit;
the emitting stage of the output end of the photoelectric coupler U1A is connected in series with the resistor R4 and is grounded, the emitting stage of the output end of the photoelectric coupler U1B is connected in series with the resistor R7 and is grounded, and the emitting stage of the output end of the photoelectric coupler U1C is connected in series with the resistor R6 and is grounded.
3. The optical coupling isolation-based three-phase alternating current zero-crossing detection circuit as claimed in claim 2, wherein: the signal output circuit comprises a switching transistor Q1, a switching transistor Q2 and a switching transistor Q3;
the base electrode of the switching triode Q1 is connected with the emitter of the output end of the photoelectric coupler U1A, the collector electrode of the switching triode Q1 is connected with the 5V power supply, and the emitter of the switching triode Q1 is connected with the resistor R5 in series and is grounded;
the base electrode of the switching triode Q2 is connected with the emitter of the output end of the photoelectric coupler U1B, the collector electrode of the switching triode Q2 is connected with the 5V power supply, and the emitter of the switching triode Q2 is connected with the resistor R8 in series and is grounded;
the base electrode of the switching triode Q3 is connected with the emitter of the output end of the photoelectric coupler U1C, the collector electrode of the switching triode Q3 is connected with the 5V power supply, and the emitter of the switching triode Q3 is connected with the resistor R9 in series and is grounded;
and the output ends of the resistor R5, the resistor R8 and the resistor R9 are connected with the singlechip.
4. The optical coupling isolation-based three-phase alternating current zero-crossing detection circuit according to claim 3, characterized in that: the protection circuit comprises a diode D1, a diode D2 and a diode D3, wherein the cathode of the diode D1 is connected with the anode of the input end of a photoelectric coupler U1A, the anode of the diode D1 is connected with the cathode of the input end of a photoelectric coupler U1A, the cathode of the diode D2 is connected with the anode of the input end of the photoelectric coupler U1B, the anode of the diode D2 is connected with the cathode of the input end of the photoelectric coupler U1B, the cathode of the diode D3 is connected with the anode of the input end of the photoelectric coupler U1C, and the anode of the diode D3 is connected with the cathode of the input end of the photoelectric coupler U1C.
5. The optical coupling isolation-based three-phase alternating current zero-crossing detection circuit according to claim 4, characterized in that: the protection circuit further comprises a current-limiting resistor R1, a current-limiting resistor R2 and a current-limiting resistor R3, wherein one end of the current-limiting resistor R1 is connected with a three-phase alternating current power supply, the other end of the current-limiting resistor R1 is connected with the negative electrode of a diode D1, one end of the current-limiting resistor R2 is connected with the three-phase alternating current power supply, the other end of the current-limiting resistor R2 is connected with the negative electrode of a diode D2, one end of the current-limiting resistor R3 is connected with the three-phase alternating current power supply, and the other end of the current-limiting resistor R1 is connected.
6. The optical coupling isolation-based three-phase alternating current zero-crossing detection circuit according to claim 5, characterized in that: the emitter of the switching triode Q1 is connected with the A + interface of the oscilloscope, and the A-interface of the oscilloscope is grounded.
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| CN201920798566.1U CN210803576U (en) | 2019-05-30 | 2019-05-30 | Three-phase alternating current zero-crossing detection circuit based on optical coupling isolation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969999A (en) * | 2020-06-28 | 2020-11-20 | 上海宇航系统工程研究所 | Reliable carrier rocket separation signal isolation detection and self-locking circuit |
| CN112415260A (en) * | 2020-12-02 | 2021-02-26 | 中山市优胜电子科技有限公司 | Isolated form singlechip alternating current zero crossing signal detection circuitry |
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2019
- 2019-05-30 CN CN201920798566.1U patent/CN210803576U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969999A (en) * | 2020-06-28 | 2020-11-20 | 上海宇航系统工程研究所 | Reliable carrier rocket separation signal isolation detection and self-locking circuit |
| CN111969999B (en) * | 2020-06-28 | 2023-08-11 | 上海宇航系统工程研究所 | Reliable carrier rocket separation signal isolation detection and self-locking circuit |
| CN112415260A (en) * | 2020-12-02 | 2021-02-26 | 中山市优胜电子科技有限公司 | Isolated form singlechip alternating current zero crossing signal detection circuitry |
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