CN109061277A - A kind of zero crossing detection device and detection method based on electromagnetic induction - Google Patents
A kind of zero crossing detection device and detection method based on electromagnetic induction Download PDFInfo
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- CN109061277A CN109061277A CN201810599218.1A CN201810599218A CN109061277A CN 109061277 A CN109061277 A CN 109061277A CN 201810599218 A CN201810599218 A CN 201810599218A CN 109061277 A CN109061277 A CN 109061277A
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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
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Abstract
The present invention proposes a kind of zero crossing detection device based on electromagnetic induction, comprising: AC power source provides AC signal；Ac signal is converted into low-voltage ac signal by electromagnetic induction unit, and the input terminal of electromagnetic induction unit is arranged close to AC power source load wire, and the output end of electromagnetic induction unit is connect with the input terminal of AC signal amplifying unit；The positive half-wave signal and output, output end of AC signal amplifying unit amplification low-voltage ac signal are connect with the input terminal of Zero-cross comparator unit；Zero-cross comparator unit compares the low-voltage ac signal after enhanced processing and zero passage detection signal, exports zero cross signal and the signal is exported to microprocessor；Microprocessor determines the zero crossing of ac signal according to zero cross signal.Circuit of the present invention is simple, cost is relatively low, does not need isolation output unit circuit, it is only necessary to which the zero passage detection of high-voltage ac power can be realized in electromagnetic induction unit and Zero-cross comparator unit, can track zero crossing immediately when load changes greatly.
Description
Technical field
The invention belongs to electronic technology field, especially a kind of zero crossing detection device based on electromagnetic induction and detection side
Method.
Background technique
Currently, the development of intelligent appliance is very swift and violent.And zero cross detection circuit then obtains in intelligent appliance system extensively
Application.Existing zero cross detection circuit is mostly to obtain zero crossing with the mode of electric resistance partial pressure or voltage-stabiliser tube, although this method
It is easy to accomplish, cost is relatively low, but poor in terms of electrical isolation and anti-interference ability；Some zero passage detections are with RC mode from power grid
Electricity is taken, but since continuous power consumption causes power consumption larger to resistance at work；Some then concatenates current limliting electricity directly on power line
Resistance, directly drives optocoupler, detects zero cross signal, and which structure is simple, can play buffer action, but be also power consumption compared with
Greatly, and there is offset in signal.
Summary of the invention
Technical problem solved by the invention is to provide a kind of zero crossing detection device based on electromagnetic induction and detection side
Method solves the problems, such as that the zero cross detection circuit electrical isolation of the prior art and poor anti jamming capability, at high cost and power consumption are big.
The technical solution for realizing the aim of the invention is as follows:
A kind of zero crossing detection device based on electromagnetic induction, including sequentially connected AC power source, electromagnetic induction unit, friendship
Flow signal amplification unit, Zero-cross comparator unit and microprocessor；
AC power source, for providing AC signal；
Electromagnetic induction unit, for ac signal to be converted into low-voltage ac signal, the input terminal of electromagnetic induction unit
It is arranged close to AC power source load wire, the output end of electromagnetic induction unit is connect with the input terminal of AC signal amplifying unit；
AC signal amplifying unit, for amplifying positive half-wave signal and the output of low-voltage ac signal, output end and zero passage
The input terminal of comparing unit connects；
Zero-cross comparator unit is exported for comparing the low-voltage ac signal after enhanced processing and zero passage detection signal
Zero cross signal is simultaneously exported the signal to microprocessor；
Microprocessor, for determining the zero crossing of ac signal according to zero cross signal.
Optionally, zero passage detection signal is square-wave signal, and the phase of the phase of zero passage detection signal and low-voltage ac signal
Bit synchronization.
Optionally, electromagnetic induction unit includes the first inductance, first capacitor and the second capacitor, the first inductance and first capacitor
Parallel connection, the contact altogether of the first inductance and first capacitor connects the second capacitor, and the first inductance and the another of first capacitor are total to contact
It is the input terminal of electromagnetic induction unit, the other end of the second capacitor is the output end of electromagnetic induction unit.
Optionally, the first inductance is m concatenated inductance, and first capacitor is n capacitor in parallel, and m, n are positive integer.
Optionally, AC signal amplifying unit includes the first operational amplifier, first resistor and second resistance, the first operation
The output end of the forward signal input terminal connection electromagnetic induction unit of amplifier, one end of first resistor and one end of second resistance
The total contact of connection, the other end ground connection of first resistor, first resistor and second resistance connects the negative sense of the first operational amplifier
Signal input part, the other end of second resistance connect the output end of the first operational amplifier, second resistance and the first operation amplifier
The total contact of device output end is the output end of AC signal amplifying unit, and the resistance value of first resistor is much smaller than the resistance of second resistance
Value.
Optionally, first resistor is the mutually series-parallel resistance of p, and second resistance is q mutually series-parallel resistance, p,
Q is positive integer.
Optionally, Zero-cross comparator unit includes 3rd resistor, the 4th resistance, the 5th resistance, first comparator, third capacitor
And first diode,
The output end of one end connection AC signal amplifying unit of 3rd resistor, the first ratio of other end connection of 3rd resistor
Compared with the forward signal input terminal of device, one end of the 4th resistance connects the negative-going signal input terminal of first comparator, the 4th resistance
Other end ground connection, the output end of one end connection first comparator of the 5th resistance, the other end of the 5th resistance connect third capacitor
One end, the other end ground connection of third capacitor, third capacitor connect the cathode of first diode with the total contact of the 5th resistance, the
The plus earth of one diode, the total contact of the 5th resistance, third capacitor and first diode cathode are Zero-cross comparator units
It output end and is connect with microprocessor, first diode filters out surge voltage.
Optionally, 3rd resistor is i mutually series-parallel resistance, and the 4th resistance is j mutually series-parallel resistance, the
Five resistance are k mutually series-parallel resistance, and third capacitor is l capacitor in parallel, and i, j, k, l are positive integer.
The zero passage detection method based on electromagnetic induction that the present invention also provides a kind of, specifically includes the following steps:
Step 1: electromagnetic induction unit detects the magnetic field signal of AC power source load wire output, and resonance circuit therein will
Magnetic field signal is converted to the consistent low-voltage alternating-current electric signal of intensity, and inhibits DC signal component by ac-coupled circuit, then
It exports and gives AC signal amplifying unit；
Step 2: operational amplifier in AC signal amplifying unit to the positive half-wave signal in low-voltage alternating-current electric signal into
Row enhanced processing does not handle negative half-wave signa, is then output to Zero-cross comparator unit；
Step 3: the comparator in Zero-cross comparator unit carries out Zero-cross comparator output to low-voltage alternating-current electric signal, in positive half-wave
Signal exports high level when arriving, and exports low level when non-positive half-wave signal arrives, and filter out high-frequency ac by RC filter
Signal is filtered out the surge voltage of square wave by diode, then exports zero cross signal and the signal is exported to microprocessor；
Step 4: microprocessor determines the zero crossing of ac signal according to zero cross signal.
The present invention also provides a kind of electric appliances, including the zero passage based on electromagnetic induction any in claim 1 to 8
Detection device.
Through the above technical solutions, the beneficial effects of the present invention are: the present invention acquires High Level AC Voltage using electromagnetic induction
Waveform signal, compared with the existing technology have stronger isolation effect, higher anti-interference ability and lower power consumption, and
Circuit of the invention is simple, and cost is relatively low.
Detailed description of the invention
Fig. 1 is the overall schematic of the zero crossing detection device of the invention based on electromagnetic induction；
Fig. 2 is the zero crossing detection device circuit structure diagram of the invention based on electromagnetic induction；
Fig. 3 is the signal waveforms of the zero crossing detection device of the invention based on electromagnetic induction；
Fig. 4 is the flow chart of the zero passage detection method of the invention based on electromagnetic induction.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
A kind of zero crossing detection device 100 based on electromagnetic induction, as shown in Figure 1-Figure 3, including sequentially connected alternating current
Source, electromagnetic induction unit, AC signal amplifying unit, Zero-cross comparator unit and microprocessor.
AC power source, for providing AC signal.
Electromagnetic induction unit 101, for ac signal to be converted into low-voltage ac signal, the input of electromagnetic induction unit
It holds and is arranged close to AC power source load wire, the output end of electromagnetic induction unit and the input terminal of AC signal amplifying unit connect
It connects.Electromagnetic induction unit include the first inductance L1, first capacitor C1 and the second capacitor C2, the first inductance L1 and first capacitor C1 simultaneously
The contact that has altogether of connection, the first inductance L1 and first capacitor C1 is connected the second capacitor C2, and the first inductance L1 and first capacitor C1's is another
Contact is the input terminal of electromagnetic induction unit altogether, and the other end of the second capacitor C2 is the output end of electromagnetic induction unit.
AC signal amplifying unit 102, for amplifying positive half-wave signal and the output of low-voltage ac signal, output end and mistake
The input terminal of zero balancing unit connects.AC signal amplifying unit includes the first operational amplifier U1, first resistor R1 and second
The output end of the forward signal input terminal connection electromagnetic induction unit of resistance R2, the first operational amplifier U1, first resistor R1's
One end is connect with one end of second resistance R2, and the other end ground connection of first resistor R1, first resistor R1 is total to second resistance R2's
Contact connects the negative-going signal input terminal of the first operational amplifier U1, and the other end of second resistance R2 connects the first operational amplifier
The total contact of the output end of U1, second resistance R2 and the first operational amplifier U1 output end is the output of AC signal amplifying unit
End, and the resistance value of first resistor R1 is much smaller than the resistance value of second resistance R2.
Zero-cross comparator unit 103, for comparing the low-voltage ac signal after enhanced processing and zero passage detection signal, mistake
Zero detection signal is the Phase synchronization of square-wave signal and phase and low-voltage ac signal, exports zero cross signal and the signal is exported
To microprocessor.Zero-cross comparator unit includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first comparator U2, third
The output end of one end connection AC signal amplifying unit of capacitor C3 and first diode D1,3rd resistor R3,3rd resistor R3
Other end connection first comparator U2 forward signal input terminal, one end connection first comparator U2's of the 4th resistance R4 is negative
To signal input part, the other end of the 4th resistance R4 is grounded, the output end of one end connection first comparator U2 of the 5th resistance R5,
One end of the other end connection third capacitor C3 of 5th resistance R5, the other end ground connection of third capacitor C3, third capacitor C3 and the
The cathode of the total contact connection first diode D1 of five resistance R5, the plus earth of first diode D1, the 5th resistance R5, third
The total contact of capacitor C3 and first diode D1 cathode is the output end of Zero-cross comparator unit and connect with microprocessor, the one or two
Pole pipe D1 filters out surge voltage.
Microprocessor 200, for determining the zero crossing of ac signal according to zero cross signal.
Based on identical working principle, the embodiment of the invention also provides a kind of zero passage detection sides based on electromagnetic induction
Method, as shown in figure 4, specifically includes the following steps:
Step 1: electromagnetic induction unit detects the magnetic field signal of AC power source load wire output, and resonance circuit therein will
Magnetic field signal is converted to the consistent low-voltage alternating-current electric signal of intensity, and inhibits DC signal component by ac-coupled circuit, then
It exports and gives AC signal amplifying unit.Assuming that AC power source AC output alternating current Uac be 220V alternating current, the first inductance L1 and
First capacitor C1 forms resonance circuit, and resonance frequency is consistent with the frequency of AC power source AC, and the magnetic field that AC power source AC is generated is strong
Spend consistent with the current strength of AC power source AC, it is consistent that the AC power source AC magnetic field signal generated is transformed into intensity by resonance circuit
Low-voltage alternating-current electric signal, it is, resonance circuit output low-voltage alternating-current electrical signal intensity and AC power source AC electric current it is strong
Degree is consistent.Second capacitor C2 is ac coupling capacitor, its effect is that the low-voltage alternating-current electric signal for allowing resonance circuit to export leads to
It crosses, inhibits DC signal component.
Step 2: operational amplifier in AC signal amplifying unit to the positive half-wave signal in low-voltage alternating-current electric signal into
Row enhanced processing does not handle negative half-wave signa, is then output to Zero-cross comparator unit.Assuming that the first operational amplifier U1 and
The mid-point voltage of the first operational amplifier is set 0V, the first operational amplifier by the direct current supply VCC=5V of one comparator U2
U1 only amplifies the positive half-wave signal of input low-voltage ac signal, and the signal of negative half-wave is then non-treated, wherein first resistor
The ratio of R1 and second resistance R2 determine the first operational amplifier U1 to the amplification factor of input low-voltage ac signal positive half-wave.
Step 3: the comparator in Zero-cross comparator unit carries out Zero-cross comparator output to low-voltage alternating-current electric signal, in positive half-wave
Signal exports high level when arriving, and exports low level when non-positive half-wave signal arrives, and filter out high-frequency ac by RC filter
Signal is filtered out the surge voltage of square wave by diode, then exports zero cross signal and the signal is exported to microprocessor.Exchange
Signal amplification unit amplification output positive half-wave signal by 3rd resistor R3 input first comparator U2, U2 pairs of first comparator
The positive half-wave signal of AC signal amplifying unit amplification output carries out Zero-cross comparator output, in the output of AC signal amplifying unit
When positive half-wave signal arrives, first comparator U2 exports high level VCC, does not export positive half-wave signal in AC signal amplifying unit
When, first comparator U2 exports low level GND.5th resistance R5 and third capacitor C3 forms RC filter, filters out the friendship of high frequency
Signal is flowed, guarantees the quality of first comparator U2 output signal；Wherein first diode D1 connection microprocessor, its effect be
The surge voltage for filtering out first comparator U2 output square wave, protects microprocessor.
Step 4: microprocessor determines the zero crossing of ac signal according to zero cross signal.
Zero crossing detection device and zero passage detection method based on electromagnetic induction are all the low-voltage ac signals of processing, and not
Specialized voltages are needed to power, it follows that the produced power consumption of its in detection process will be very low, isolation effect is fine, Jin Eryou
Guarantee the safety of machine system while helping reduce the Overall Power Consumption of equipment.
In addition, the embodiment of the invention also provides a kind of electric appliances comprising the above-mentioned zero passage detection based on electromagnetic induction
Device.The electric appliance can be the living electric apparatus such as new blower, kitchen ventilator, washing machine.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement should be regarded as guarantor of the invention
Protect range.
Claims (10)
1. a kind of zero crossing detection device based on electromagnetic induction, which is characterized in that including sequentially connected AC power source, electromagnetism sense
Answer unit, AC signal amplifying unit, Zero-cross comparator unit and microprocessor；
AC power source, for providing AC signal；
Electromagnetic induction unit, for ac signal to be converted into low-voltage ac signal, the input terminal of electromagnetic induction unit is close
The setting of AC power source load wire, the output end of electromagnetic induction unit are connect with the input terminal of AC signal amplifying unit；
AC signal amplifying unit, for amplifying positive half-wave signal and the output of low-voltage ac signal, output end and Zero-cross comparator
The input terminal of unit connects；
Zero-cross comparator unit exports zero passage for comparing the low-voltage ac signal after enhanced processing and zero passage detection signal
Signal is simultaneously exported the signal to microprocessor；
Microprocessor, for determining the zero crossing of ac signal according to zero cross signal.
2. the zero crossing detection device according to claim 1 based on electromagnetic induction, which is characterized in that zero passage detection signal is
Square-wave signal, and the Phase synchronization of the phase of zero passage detection signal and low-voltage ac signal.
3. the zero crossing detection device according to claim 1 based on electromagnetic induction, which is characterized in that electromagnetic induction unit packet
Include the first inductance, first capacitor and the second capacitor, the first inductance is in parallel with first capacitor, the first inductance and first capacitor altogether
Another contact altogether of contact the second capacitor of series connection, the first inductance and first capacitor is the input terminal of electromagnetic induction unit, the second electricity
The other end of appearance is the output end of electromagnetic induction unit.
4. the zero crossing detection device according to claim 3 based on electromagnetic induction, which is characterized in that the first inductance is m
Concatenated inductance, first capacitor are n capacitor in parallel, and m, n are positive integer.
5. the zero crossing detection device according to claim 1 based on electromagnetic induction, which is characterized in that AC signal amplification is single
Member includes the first operational amplifier, first resistor and second resistance, and the forward signal input terminal of the first operational amplifier connects electricity
The output end of magnetic induction unit, one end of first resistor and one end of second resistance connect, the other end ground connection of first resistor, the
One resistance and the total contact of second resistance connect the negative-going signal input terminal of the first operational amplifier, and the other end of second resistance connects
Connect the output end of the first operational amplifier, the total contact of second resistance and the first operational amplifier output terminal is AC signal amplification
The output end of unit, and the resistance value of first resistor is much smaller than the resistance value of second resistance.
6. the zero crossing detection device according to claim 5 based on electromagnetic induction, which is characterized in that first resistor is p
Mutually series-parallel resistance, second resistance are q mutually series-parallel resistance, and p, q are positive integer.
7. the zero crossing detection device according to claim 1 based on electromagnetic induction, which is characterized in that Zero-cross comparator unit packet
3rd resistor, the 4th resistance, the 5th resistance, first comparator, third capacitor and first diode are included,
The output end of one end connection AC signal amplifying unit of 3rd resistor, the other end of 3rd resistor connect first comparator
Forward signal input terminal, the 4th resistance one end connection first comparator negative-going signal input terminal, the 4th resistance it is another
End ground connection, the output end of one end connection first comparator of the 5th resistance, the one of the other end connection third capacitor of the 5th resistance
End, the other end ground connection of third capacitor, third capacitor connect the cathode of first diode with the total contact of the 5th resistance, and the one or two
The total contact of the plus earth of pole pipe, the 5th resistance, third capacitor and first diode cathode is the output of Zero-cross comparator unit
It holds and is connect with microprocessor, first diode filters out surge voltage.
8. the zero crossing detection device according to claim 7 based on electromagnetic induction, which is characterized in that 3rd resistor is i
Mutually series-parallel resistance, the 4th resistance are j mutually series-parallel resistance, and the 5th resistance is k mutually series-parallel resistance,
Third capacitor is l capacitor in parallel, and i, j, k, l are positive integer.
9. a kind of zero passage detection method based on electromagnetic induction, which comprises the following steps:
Step 1: electromagnetic induction unit detects the magnetic field signal of AC power source load wire output, and resonance circuit therein is by magnetic field
Signal is converted to the consistent low-voltage alternating-current electric signal of intensity, and inhibits DC signal component by ac-coupled circuit, then exports
Give AC signal amplifying unit；
Step 2: the operational amplifier in AC signal amplifying unit puts the positive half-wave signal in low-voltage alternating-current electric signal
Whether big processing negative half-wave signa or not, is then output to Zero-cross comparator unit；
Step 3: the comparator in Zero-cross comparator unit carries out Zero-cross comparator output to low-voltage alternating-current electric signal, in positive half-wave signal
High level is exported when arrival, exports low level when non-positive half-wave signal arrives, and high frequency ac signal is filtered out by RC filter,
The surge voltage of square wave is filtered out by diode, then exports zero cross signal and this is exported to microprocessor；
Step 4: microprocessor determines the zero crossing of ac signal according to zero cross signal.
10. a kind of electric appliance, which is characterized in that including the zero passage detection based on electromagnetic induction any in claim 1 to 8
Device.
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| CN114808366A (en) * | 2022-05-27 | 2022-07-29 | 无锡小天鹅电器有限公司 | Clothes treating apparatus |
| CN117990982A (en) * | 2024-04-02 | 2024-05-07 | 成都金诺信高科技有限公司 | Same-frequency signal phase measuring circuit, chip and device based on trigger |
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