CN109459607A - A kind of isolated accurate zero cross detection circuit - Google Patents
A kind of isolated accurate zero cross detection circuit Download PDFInfo
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- CN109459607A CN109459607A CN201811271253.7A CN201811271253A CN109459607A CN 109459607 A CN109459607 A CN 109459607A CN 201811271253 A CN201811271253 A CN 201811271253A CN 109459607 A CN109459607 A CN 109459607A
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- 238000001514 detection method Methods 0.000 title claims abstract description 91
- 238000002955 isolation Methods 0.000 claims abstract description 44
- 230000005669 field effect Effects 0.000 claims description 34
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000000694 effects Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
Abstract
The present invention provides a kind of isolated accurate zero cross detection circuit, comprising: including the positive and negative detection circuit of waveform, isolation circuit and signal generating circuit；The AC signal of exchange detection source is conveyed into the positive and negative detection circuit of waveform, and the positive and negative detection circuit of waveform controls isolation circuit, and the positive and negative all signals of waveform are transferred to signal generating circuit.It the advantage is that the zero passage detection realized for alternating current source, avoid larger detection error existing for usual zero passage detection, and realize the isolation of circuit using optocoupler.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of zero cross detection circuits.
Background technique
Zero passage detection refers in AC system, when waveform is converted from positive half cycle to negative half period, when by zero-bit, is
The detection that system is made.Zero passage detection can make switching circuit or frequency detecting.It is lonely in the PFC of rectification circuit, power grid
Synchronizing for island etc. be grid-connected, it is circuit load synchronize etc. in have extensive utilization.
However, existing zero cross detection circuit, has deficiency below:
1. common optoelectronic coupler zero cross detection circuit is to issue pulse in exchange detection source zero crossing, can not differentiate positive and negative
Half cycle, and Pulse-duration cannot achieve controllable adjustment.
2. although being effectively controlled carry out zero cross detection circuit cost by triode, the precision of zero passage detection is very
It is low, and be easy by noise jamming.
3. carrying out zero passage detection by comparator, it just can not really show effective electrical isolation, and be easy to be interfered.
Summary of the invention
The isolated accurate zero cross detection circuit of one kind of offer of the invention, to overcome the deficiencies of existing technologies.
The present invention provides a kind of isolated accurate zero cross detection circuit, comprising: including the positive and negative detection circuit of waveform, isolation
Circuit and signal generating circuit；The positive and negative detection compensation circuit of waveform includes current-limiting resistance R2, diode D1 and detection compensating electric capacity
C1；Isolation circuit includes: isolation optocoupler U2, field effect transistor U1, current-limiting resistance R3 and current-limiting resistance R4；Current-limiting resistance R2's
One end is connect with one end of input signal INPUT, and the other end is connect with the anode of diode D1；Detect one end of compensating electric capacity C1
The cathode of diode D1 connects, and the other end is connect with the other end of input signal INPUT；Detect compensating electric capacity C1 one end also with
An input terminal of the isolation optocoupler U2 of isolation circuit connects；An input terminal of isolation optocoupler U2 is with detection compensating electric capacity C1's
One end connection, another input terminal are connect with one end of current-limiting resistance R3；The other end and field effect transistor of current-limiting resistance R3
The drain electrode of U1 connects；The source electrode of field effect transistor U1 and the detection other end of compensating electric capacity C1, input signal INPUT it is another
End connection；One end of current-limiting resistance R2 is connect with the grid of field effect transistor U1, one end of the other end and input signal INPUT
Connection；An output end of isolation optocoupler U2 is connect with signal generating circuit, and another output is connect with signal generating circuit,
Also by being grounded after current-limiting resistance R4.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: waveform
Positive and negative detection compensation circuit further includes zener diode D2；Zener diode D2 is connected in parallel on the both ends of detection compensating electric capacity C1.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: pressure stabilizing
The cathode of diode D2 is connect with the cathode of diode D1, and anode is connect with the other end of input signal INPUT.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: field effect
Answering transistor U1 is n type field effect transistor.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: isolation
Circuit further includes current-limiting resistance R1 and zener diode D3；Zener diode D3 is connected in parallel on the grid of n type field effect transistor U1
With source electrode both ends；One end of current-limiting resistance R1 is connect with the cathode of the grid of field effect transistor U1, zener diode D3, another
End is connect with one end of input signal INPUT.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: pressure stabilizing
The anode of diode D3 is connect with the source electrode of n type field effect transistor U1, and the grid of cathode and n type field effect transistor U1 connect
It connects.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: signal
Generative circuit includes: NAND gate chip U3, NOT gate chip U4, NAND gate chip U5, maintains capacitor C2；The one of NAND gate chip U3
The output port connection of a input end door chip U4, another input terminal are connect with the another output of isolation optocoupler U2；With
An input terminal of NOT gate chip U4 is connected with the output end of NAND gate chip U3；Maintain one end and the NAND gate chip of capacitor C2
The output end of U3 connects, and the other end is connect with another input terminal of NAND gate chip U4；Two inputs of NAND gate chip U5
End is connect with the output end of NAND gate chip U4, and output end is connect with signal output end OUTPUT.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: signal
Generative circuit further include: pull-up resistor R5, pull down resistor R6, pull-up resistor R7, pull-up resistor R8 and accessory power supply VCC；Isolation
The accessory power supply VCC connection of an output end and signal generating circuit of optocoupler U2；The output end of NAND gate chip U3 passes through upper
Pull-up resistor R5 is connect with accessory power supply VCC；The output end of NAND gate chip U4 is connected by pull-up resistor R7 and accessory power supply VCC
It connects；The output end of NAND gate chip U5 is connect by pull-up resistor R8 with accessory power supply VCC；Another of NAND gate chip U4 is defeated
Enter end to be grounded by pull down resistor R6.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: input
Signal INPUT is 110~400V, the AC signal of 50/60HZ.
Further, the present invention provides a kind of isolated accurate zero cross detection circuit, can also have the following features: input
The source electrode ground connection of the other end of signal INPUT, the other end for detecting compensating electric capacity C1, field effect transistor U1.
The present invention provides a kind of isolated accurate zero cross detection circuit, realizes the zero passage detection for alternating current source, avoids
Larger detection error existing for usual zero passage detection, and the isolation of circuit is realized using optocoupler.
Detailed description of the invention
Fig. 1 is the isolated accurate zero cross detection circuit figure of one kind of the invention.
Fig. 2 is the positive and negative detection circuit figure of waveform of the invention.
Fig. 3 is isolates circuit diagram of the invention.
Fig. 4 is signal generating circuit figure of the invention.
Specific embodiment
The present invention will be further described in the following with reference to the drawings and specific embodiments.
Fig. 1 is isolated accurate zero cross detection circuit figure of the invention.
As shown in Figure 1, the isolated accurate zero cross detection circuit of one of the present embodiment, including the positive and negative detection electricity of waveform
Road, isolation circuit and signal generating circuit.The AC signal of exchange detection source is conveyed into the positive and negative detection circuit of waveform, and waveform is positive and negative
Detection circuit controls isolation circuit, and the positive and negative all signals of waveform are transferred to signal generating circuit.
Fig. 2 is the positive and negative detection circuit figure of waveform of the invention.
As depicted in figs. 1 and 2, the positive and negative detection compensation circuit of waveform includes: current-limiting resistance R2, diode D1, detection compensation
Capacitor C1 and zener diode D2.
One end of current-limiting resistance R2 is connect with one end of input signal INPUT, and the other end is connect with the anode of diode D1.
The cathode connection of one end diode D1 of compensating electric capacity C1 is detected, the other end is connect with the other end of input signal INPUT.Detection
One end of compensating electric capacity C1 is also connect with an input terminal of the isolation optocoupler U2 of isolation circuit.Zener diode D2 is connected in parallel on inspection
The both ends of compensating electric capacity C1 are surveyed, and the cathode of zener diode D2 is connect with the cathode of diode D1, anode and input signal
The other end of INPUT connects.
Input signal INPUT in the present embodiment is 110~400V, the AC signal of 50/60HZ.AC signal passes through limit
Leakage resistance R2 and diode D1 connecting detection compensating electric capacity C1 can charge to detection compensating electric capacity C1, zener diode pair
It detects compensating electric capacity C1 and carries out pressure stabilizing.Compensating electric capacity C1 connection isolation optocoupler U2 and n type field effect transistor U1 are detected, isolation is worked as
When optocoupler U2 and n type field effect transistor U1 is connected, it can be discharged by it.
Fig. 3 is isolates circuit diagram of the invention.
As shown in figures 1 and 3, isolation circuit include: isolation optocoupler U2, n type field effect transistor U1, current-limiting resistance R1,
Current-limiting resistance R3, current-limiting resistance R4, zener diode D3.
An input terminal of isolation optocoupler U2 is connect with one end of detection compensating electric capacity C1, another input terminal and current limliting electricity
Hinder one end connection of R3；AC signal and detection compensating electric capacity C1 can discharge to it and turn it on.The other end of current-limiting resistance R3
It is connect with the drain electrode of n type field effect transistor U1；Limitation passes through the size of current of the branch.The source of n type field effect transistor U1
Pole is connect with the other end of the other end of detection compensating electric capacity C1, input signal INPUT, for controlling the branch on-off, is controlled
Detect compensating electric capacity C1 discharge time.Zener diode D3 is connected in parallel on grid and the source electrode both ends of n type field effect transistor U1；And
The anode of zener diode D3 is connect with the source electrode of n type field effect transistor U1, the grid of cathode and n type field effect transistor U1
Connection.One end of current-limiting resistance R1 is connect with the cathode of the grid of n type field effect transistor U1, zener diode D3, the other end
It is connect with one end of input signal INPUT.The conducting shutdown voltage that zener diode D3 controls n type field effect transistor U1 is big
It is small.
The other end, the detection other end of compensating electric capacity C1, the anode of zener diode D2, N-type field of input signal INPUT
The source electrode of effect transistor U1 is grounded.
The accessory power supply VCC connection of an output end and signal generating circuit of isolation optocoupler U2, another output with
Signal generating circuit connection, also by being grounded after current-limiting resistance R4.Current-limiting resistance R4 is connected to isolation optocoupler U2 output port
It, will be in the AC signal transmission rear class signal generating circuit of positive-negative half-cycle between GND.
Fig. 4 is signal generating circuit figure of the invention.
As shown in Figure 1 and Figure 4, signal generating circuit include: NAND gate chip U3, NOT gate chip U4, NAND gate chip U5,
Maintain capacitor C2, pull-up resistor R5, pull down resistor R6, pull-up resistor R7, pull-up resistor R8 and accessory power supply VCC.
The output port connection of an input end door chip U4 of NAND gate chip U3, another input terminal and isolation optocoupler
The another output of U2 connects.An input terminal of NAND gate chip U4 is connected with the output end of NAND gate chip U3.It maintains
One end of capacitor C2 is connect with the output end of NAND gate chip U3, and another input terminal of the other end and NAND gate chip U4 connect
It connects.Two input terminals of NAND gate chip U5 are connect with the output end of NAND gate chip U4, output end and signal output end
OUTPUT connection.
The output end of NAND gate chip U3 is connect by pull-up resistor R5 with accessory power supply VCC.NAND gate chip U4's is defeated
Outlet is connect by pull-up resistor R7 with accessory power supply VCC.The output end of NAND gate chip U5 passes through pull-up resistor R8 and auxiliary
Power supply VCC connection.Another input terminal of NAND gate chip U4 is grounded by pull down resistor R6.Accessory power supply VCC is to NAND gate
Chip U3, NAND gate chip U4, NAND gate chip U5 power supply.
When the mutation of NAND gate chip U3 output end, capacitor C2 is maintained to maintain both end voltage constant, to reach signal backward
The purpose of grade NAND gate chip transmission.It maintains capacitor C2 by pull-up resistor R5, pull down resistor R6 charge and discharge simultaneously, and is adjusted
Discharge time.
When powering on, when exchanging detection source and be in positive half cycle, by current-limiting resistance R1, diode D1 is to detecting compensating electric capacity
C1 charging, at the same by the direction current-limiting resistance R2, by zener diode D3, so that n type field effect transistor U1 is connected, exchange
Detection source passes through current-limiting resistance R1, diode D1, isolation optocoupler U2, n type field effect transistor U1 electric discharge, so that isolation optocoupler U2
Conducting, transmits a signal to late-class circuit, and when detection compensating electric capacity C1 charges to zener diode D2 limitation voltage, detection is mended
It repays capacitor C1 and stops charging.And when exchange detection source shortly past zero point or will be close to zero point when, provided undertension with when examine
Compensating electric capacity and n type field effect transistor U1 conducting are surveyed, compensating electric capacity C1 is detected at this time and starts to discharge, exchange detection source is carried out
Compensation, to achieve the purpose that accurate zero passage detection.
When exchange detection source be in negative half period when, electric current flows through zener diode D3, current-limiting resistance R2, conduction voltage drop make
U1 shutdown is obtained, so that isolation optocoupler U2 is turned off, and detection compensating electric capacity C1 does not have discharge loop, ties up electricity when slow zero crossing
Pressure.
When exchange detection source is in positive half cycle, isolation optocoupler U2 output end is connected, NAND gate chip U3 and isolation optocoupler
U2 connected input terminal is high level (1), and another input terminal is connected also for high electricity by pull-up resistor R7 with accessory power supply VCC
Flat, NAND gate chip U3 output end is low level (0) at this time, then two input terminals of NAND gate chip U4 are all low level,
To which NAND gate chip U4 output is high level, after inputting junior, the final output of NAND gate chip U5 is low level.
When exchange detection source is transferred to by positive half cycle zero passage the moment of negative half period, isolation optocoupler U2 shutdown, NAND gate chip U3
The input terminal moment connected with light coupling U2 is isolated will be low level from high level, and NAND gate chip U3 output at this time is at once from low
It is high level that level, which increases, and due to maintaining the presence of capacitor C2, the input terminal that NAND gate chip U4 is connected with maintenance capacitor C2
Also moment is increased to high level from low level, and NAND gate chip U4 output is low level, at this point, NAND gate chip U5's is final defeated
It is out high level.
Then (charging time can to maintaining capacitor C2 to be charged by the pull-up resistor R5 of accessory power supply, pull down resistor R6
Adjust), after a period of time, maintenance capacitor C2 both end voltage value is VCC, and capacitor C2 and the connecting pin NAND gate chip U4 is maintained to carry on the back
It is pulled down to GND, NAND gate chip U4 output end becomes high level again at this time, and NAND gate chip U5 output end becomes low electricity again
It is flat.
When power supply again through zero crossing reach positive half cycle when, detection compensating electric capacity C1 discharge so that isolation optocoupler U2 be connected,
Easily push away NAND gate chip U3 output end becomes low level from high level, maintain capacitor C2 both end voltage moment to remain unchanged, with
NOT gate chip U4 input terminal is drawn lower, keeps final NAND gate chip U5 low level output constant.
Illustrated above is only the preferred embodiment of the present invention, and present invention is not limited to the above embodiments.It is appreciated that ability
The oher improvements and changes that field technique personnel directly export or associate without departing from the basic idea of the present invention are equal
It is considered as being included within protection scope of the present invention.
Claims (10)
1. a kind of isolated accurate zero cross detection circuit, it is characterised in that: including, the positive and negative detection circuit of waveform, isolation circuit and
Signal generating circuit；
Wherein, the positive and negative detection compensation circuit of waveform includes current-limiting resistance R2, diode D1 and detection compensating electric capacity C1；
Isolation circuit includes: isolation optocoupler U2, field effect transistor U1, current-limiting resistance R3 and current-limiting resistance R4；
One end of current-limiting resistance R2 is connect with one end of input signal INPUT, and the other end is connect with the anode of diode D1；Detection
The cathode of one end diode D1 of compensating electric capacity C1 connects, and the other end is connect with the other end of input signal INPUT；Detection compensation
One end of capacitor C1 is also connect with an input terminal of the isolation optocoupler U2 of isolation circuit；
An input terminal of isolation optocoupler U2 is connect with one end of detection compensating electric capacity C1, another input terminal and current-limiting resistance R3
One end connection；The other end of current-limiting resistance R3 is connect with the drain electrode of field effect transistor U1；The source electrode of field effect transistor U1
It is connect with the other end of the other end of detection compensating electric capacity C1, input signal INPUT；One end of current-limiting resistance R2 and field-effect are brilliant
The grid of body pipe U1 connects, and the other end is connect with one end of input signal INPUT；
An output end of isolation optocoupler U2 is connect with signal generating circuit, and another output is connect with signal generating circuit,
Also by being grounded after current-limiting resistance R4.
2. isolated accurate zero cross detection circuit as described in claim 1, it is characterised in that:
The positive and negative detection compensation circuit of waveform further includes zener diode D2；Zener diode D2 is connected in parallel on detection compensating electric capacity C1's
Both ends.
3. isolated accurate zero cross detection circuit as claimed in claim 2, it is characterised in that:
The cathode of zener diode D2 is connect with the cathode of diode D1, and anode is connect with the other end of input signal INPUT.
4. isolated accurate zero cross detection circuit as described in claim 1, it is characterised in that:
Field effect transistor U1 is n type field effect transistor.
5. isolated accurate zero cross detection circuit as described in claim 1, it is characterised in that:
Isolation circuit further includes current-limiting resistance R1 and zener diode D3；
Zener diode D3 is connected in parallel on grid and the source electrode both ends of n type field effect transistor U1；One end and field of current-limiting resistance R1
The cathode connection of the grid, zener diode D3 of effect transistor U1, the other end are connect with one end of input signal INPUT.
6. isolated accurate zero cross detection circuit as claimed in claim 5, it is characterised in that:
The anode of zener diode D3 is connect with the source electrode of n type field effect transistor U1, and cathode is with n type field effect transistor U1's
Grid connection.
7. isolated accurate zero cross detection circuit as described in claim 1, it is characterised in that:
Signal generating circuit includes: NAND gate chip U3, NOT gate chip U4, NAND gate chip U5, maintains capacitor C2；
The output port connection of an input end door chip U4 of NAND gate chip U3, another input terminal and isolation optocoupler U2's
Another output connection；
An input terminal of NAND gate chip U4 is connected with the output end of NAND gate chip U3；
One end of capacitor C2 is maintained to connect with the output end of NAND gate chip U3, another of the other end and NAND gate chip U4 are defeated
Enter end connection；
Two input terminals of NAND gate chip U5 are connect with the output end of NAND gate chip U4, output end and signal output end
OUTPUT connection.
8. isolated accurate zero cross detection circuit as claimed in claim 7, it is characterised in that:
Signal generating circuit further include: pull-up resistor R5, pull down resistor R6, pull-up resistor R7, pull-up resistor R8 and accessory power supply
VCC；
The accessory power supply VCC connection of an output end and signal generating circuit of isolation optocoupler U2；
The output end of NAND gate chip U3 is connect by pull-up resistor R5 with accessory power supply VCC；The output end of NAND gate chip U4
It is connect by pull-up resistor R7 with accessory power supply VCC；The output end of NAND gate chip U5 passes through pull-up resistor R8 and accessory power supply
VCC connection；Another input terminal of NAND gate chip U4 is grounded by pull down resistor R6.
9. isolated accurate zero cross detection circuit as claimed in any of claims 1 to 8 in one of claims, it is characterised in that: input letter
Number INPUT is 110~400V, the AC signal of 50/60HZ.
10. isolated accurate zero cross detection circuit as claimed in any of claims 1 to 8 in one of claims, it is characterised in that:
The source electrode ground connection of the other end of input signal INPUT, the other end for detecting compensating electric capacity C1, field effect transistor U1.
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| CN201811271253.7A CN109459607B (en) | 2018-10-29 | 2018-10-29 | Isolated accurate zero-crossing detection circuit |
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| CN201811271253.7A CN109459607B (en) | 2018-10-29 | 2018-10-29 | Isolated accurate zero-crossing detection circuit |
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| CN109459607B CN109459607B (en) | 2024-03-12 |
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Cited By (2)
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| EP4202449A1 (en) * | 2021-12-22 | 2023-06-28 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
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| LADISLAVSTASTNY等: "Zero Cross Detection Using Phase Locked Loop", IFAC (INTERNATIONAL FEDERATION OF AUTOMATIC CONTROL), pages 294 - 298 * |
| 周子龙等: "基于PLL技术的BLDCM转子位置检测", 信息技术, pages 149 - 152 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346637A (en) * | 2019-08-23 | 2019-10-18 | 邢台子中电子科技有限公司 | A kind of method and device of sinusoid information Digital Extraction |
| EP4202449A1 (en) * | 2021-12-22 | 2023-06-28 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
| US11835553B2 (en) | 2021-12-22 | 2023-12-05 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
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| CN109459607B (en) | 2024-03-12 |
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