CN109946506A - Zero-crossing detection system - Google Patents
Zero-crossing detection system Download PDFInfo
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- CN109946506A CN109946506A CN201910305914.1A CN201910305914A CN109946506A CN 109946506 A CN109946506 A CN 109946506A CN 201910305914 A CN201910305914 A CN 201910305914A CN 109946506 A CN109946506 A CN 109946506A
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Abstract
The invention discloses a kind of zero-crossing detection systems, including zero cross signal sampling module, power module and DC filtering module；Zero cross signal sampling module includes anti-lightning surge interference circuit and mutual inductor, anti-lightning surge interference circuit is connect with the armature winding of exchange firewire input terminal, AC neutral line input terminal and mutual inductor respectively, anti-lightning surge interferes circuit to include at least safety capacitor, the armature winding and safety capacitor of mutual inductor form the first filter circuit, and the primary windings connected in series of mutual inductor accesses AC network；Power module includes bridge heap, clamp circuit, adjustment transformer, primary side feedback system, clamp circuit is connect with the second auxiliary winding of adjustment transformer, first auxiliary winding of adjustment transformer is connect with primary side feedback system, and the vice-side winding and DC voltage output end of the adjustment transformer are equipped with buffer circuit.The problem that the present invention is able to solve sample circuit delay, sampling consistency is poor, loss is big.
Description
Technical field
The present invention relates to electronic circuit technology fields, more particularly to a kind of zero-crossing detection system.
Background technique
With the development of power line carrier communication, requirement of the people to the synchronization of carrier data is higher and higher, thus right
The requirement of the accuracy of the zero point detection of ac grid voltage is also being continuously improved.Currently used zero cross detection circuit is inputting
End limits the electric current for flowing through photoelectrical coupler using current-limiting resistance, and zero passage detection has application in many electronic equipments.
Existing zero cross detection circuit principle is simple, generallys use electric resistance partial pressure and takes high-voltage signal, or is dropped using capacitance-resistance
The mode Sample AC input signal of pressure and electric resistance partial pressure, in addition, using LC oscillating circuit there are also some, non-isolated technology is adopted
Sample circuit detects zero cross signal.But these above-mentioned existing zero passage detection technical solutions, there is also sample circuit delays, sampling
The problem that consistency is poor, loss is big.
Summary of the invention
For this purpose, it is an object of the invention to propose a kind of zero-crossing detection system, to solve sample circuit delay, sampling unanimously
Property poor, the big problem of loss.
A kind of zero-crossing detection system, including zero cross signal sampling module, power module and DC filtering module；
The zero cross signal sampling module includes anti-lightning surge interference circuit and mutual inductor, the anti-lightning surge interference
Circuit is connect with the armature winding of exchange firewire input terminal, AC neutral line input terminal and the mutual inductor respectively, the anti-thunder
It hits surge interference circuit and includes at least safety capacitor, the first filtering of the armature winding of the mutual inductor and safety capacitor composition
The primary windings connected in series of circuit, the mutual inductor accesses AC network；
The power module include bridge heap, clamp circuit, adjustment transformer, primary side feedback system, the bridge heap respectively with
The zero cross signal sampling module is connected with the clamp circuit, the second auxiliary of the clamp circuit and the adjustment transformer
First auxiliary winding of winding connection, the adjustment transformer is connect with the primary side feedback system, the adjustment transformer
Vice-side winding exports DC voltage, and the vice-side winding and DC voltage output end of the adjustment transformer are equipped with for reducing ripple
With the buffer circuit of noise；
The DC filtering module connects the DC voltage output end.
The zero-crossing detection system provided according to the present invention, in zero cross signal sampling module, by the armature winding of mutual inductor
The first filter circuit is formed with safety capacitor, can be avoided the interference of harmonic wave, since the armature winding of mutual inductor is series connection access
AC network, so, when armature winding has AC signal process, electric current changes, in secondary substantially without loss
Winding will incude, and sample circuit is avoided to be delayed, no matter the voltage AC of exchange firewire input terminal or AC neutral line input terminal is 85V
Or 265V or other values can be all greater than as long as there is minimum electric current to flow through mutual inductor in the secondary windings of mutual inductor
UV grades of signal, sampling consistency is good, in addition, the low-power consumption in power module, when primary side feedback system can replenish standby
Effect, buffer circuit can reduce ripple, noise, to provide the reliable DC voltage of low ripple, low noise for rear end.
In addition, above-mentioned zero-crossing detection system according to the present invention, can also have the following additional technical features:
Further, the primary side feedback system includes rectification circuit, π type filter circuit, phase compensating circuit, feedback electricity
Road and control chip, the rectification circuit connect the first auxiliary winding of the adjustment transformer, the π type filter circuit difference
Connect the rectification circuit and the control chip, the phase compensating circuit is connected to the π type filter circuit and described whole
Between current circuit, the feed circuit is connect with the first auxiliary winding of the adjustment transformer and the control chip respectively.
Further, the DC filtering module includes active filter circuit, the active filter circuit by the tenth resistance,
Eleventh resistor, the 11st capacitor, the 12nd capacitor and second operational amplifier composition, the first end of the eleventh resistor connect
Connecing the DC voltage output end, the second end of the eleventh resistor connects the first end of the 11st capacitor, and described
The second end of 11 capacitors connects the inverting input terminal of the second operational amplifier, the second operational amplifier it is same mutually defeated
Enter end ground connection, the tenth resistance is connected to the inverting input terminal and the second operational amplifier of the second operational amplifier
Output end between, the first end of the 12nd capacitor connects the output end of the second operational amplifier, the described 12nd
The second end of capacitor is separately connected the second end of 11 resistance and the first end of the 11st capacitor.
Further, the zero-crossing detection system further includes filter and amplification module, the secondary windings connection of the mutual inductor
Secondary induction signal end, the filter and amplification module are connect with the secondary induction signal end.
Further, the filter and amplification module includes low-pass filter, third operational amplifier, four-operational amplifier
And anti-clutter circuit, the low-pass filter are connect with the non-inverting input terminal of the third operational amplifier, the third
The output end of operational amplifier connects the non-inverting input terminal of the four-operational amplifier, the input of the four-operational amplifier
End connects the anti-clutter circuit.
Further, the anti-clutter circuit includes the second triode, third transistor, the 21st resistance, the
22 resistance, the 19th capacitor, the 20th capacitor, the signal of the four-operational amplifier output, by the described 2nd 3
The isolation of pole pipe samples, the 21st resistance, the 22nd resistance, the 19th capacitor, the 20th electricity
Hold composition second level π type filtering, for controlling the conducting of the third transistor.
Further, the anti-lightning surge interference circuit further includes varistor and insurance resistance, the varistor
It is connected between the exchange firewire input terminal and the AC neutral line input terminal, the insurance resistance is connected to the exchange fire
Between line input terminal and the safety capacitor, the buffer circuit includes third capacitor and second resistance, the third capacitor and
The second resistance is connected between the vice-side winding and the DC voltage output end of the adjustment transformer.
Further, the power module further includes the second filter circuit, and second filter circuit and the bridge heap connect
It connects, the clamp circuit includes first resistor, first capacitor and first diode, and the first resistor and the first capacitor are simultaneously
Connection is connected between the bridge heap and the cathode of the first diode, and the anode of the first diode connects the adjustment and becomes
Second auxiliary winding of depressor.
Further, the filter and amplification module further includes the 13rd capacitor, the 17th resistance, the 18th resistance, the tenth
Seven capacitors, the 14th capacitor and the 19th resistance, decoupling capacitance of the 13rd capacitor as the third operational amplifier,
Negative feedback resistor of 17th resistance as the third operational amplifier, the 18th resistance and the 17th electricity
Hold the zero compensation circuit for forming the third operational amplifier, the 14th capacitor is as the four-operational amplifier
Decoupling capacitance, negative feedback resistor of the 19th resistance as the four-operational amplifier.
Further, the magnetic core of the mutual inductor use amorphous nano magnet ring, diameter 5.5mm, sensibility reciprocal 350uH, around
Line use 0.25mm composite material line, the composite material line include 95.5% Sn, 3% Ag, 1.5% Cu, it is described
The armature winding and secondary windings of mutual inductor are the same as mutually around 50 circles, the sensibility reciprocal of coil is 5uH.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the logic diagram of zero-crossing detection system according to an embodiment of the invention；
Fig. 2 is the electrical block diagram of zero cross signal sampling module and power module；
Fig. 3 is the electrical block diagram of DC filtering module；
Fig. 4 is the electrical block diagram of filter and amplification module.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Several embodiments of the invention are given in attached drawing.But the present invention can be to be permitted
Mostly different form is realized, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes
It is more thorough and comprehensive to the disclosure.
It should be noted that it can directly on the other element when element is referred to as " being fixedly arranged on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side ", "upper", "lower" and similar statement for illustrative purposes only, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.Term " and or " used herein include the arbitrary of one or more relevant listed items and
All combinations.
The zero-crossing detection system that one embodiment of the invention provides referring to FIG. 1 to FIG. 4, including zero cross signal sampling module
10, power module 20 and DC filtering module 30.
The zero cross signal sampling module 10 includes anti-lightning surge interference circuit 11 and mutual inductor L1, the anti-lightning wave
Gush interference circuit 11 respectively with exchange firewire input terminal (L), AC neutral line input terminal (N) and the mutual inductor L1 primary around
Group connection, the anti-lightning surge interference circuit 11 include at least safety capacitor C5, the armature winding of the mutual inductor L1 and institute
It states safety capacitor C5 and forms the first filter circuit, the primary windings connected in series of the mutual inductor L1 accesses AC network.By mutual inductor
The armature winding and safety capacitance group C5 of L1 can be avoided the interference of harmonic wave at the first filter circuit, due at the beginning of mutual inductor L1
Grade winding is series connection access AC network, so substantially without loss, when armature winding has AC signal process, electric current
It changes, will incude in secondary windings, the signal of secondary induction is S_in, avoids sample circuit from being delayed, no matter exchange fire
The voltage AC of line input terminal or AC neutral line input terminal is 85V or 265V or other values, as long as there is minimum electric current to flow through
Mutual inductor can all obtain the signal greater than uV grades in the secondary windings of mutual inductor, and sampling consistency is good.
It is noted that when it is implemented, exchange firewire input terminal (L) and AC neutral line input terminal (N) can be interchanged, no
It will affect workflow.
Specifically, the anti-lightning surge interference circuit 11 further includes varistor RV1 and insurance resistance in the present embodiment
FR1, the varistor RV1 are connected between the exchange firewire input terminal (L) and the AC neutral line input terminal (N), institute
Insurance resistance FR1 is stated to be connected between the exchange firewire input terminal (L) and the safety capacitor C5.
In addition, the present embodiment also improves mutual inductor L1, specifically, the magnetic core of the mutual inductor L1 uses amorphous
Nanometer magnet ring, diameter 5.5mm, sensibility reciprocal 350uH, coiling use the composite material line of 0.25mm, the composite material line packet
Include 95.5% Sn, 3% Ag, 1.5% Cu, the armature winding and secondary windings of the mutual inductor L1 are the same as mutually around 50 circles, line
The sensibility reciprocal of circle is 5uH.The mutual inductor designed in this way is small in size, high magnetic permeability, high squareness ratio and ideal high-temperature stability.
The power module 20 includes bridge heap D3, clamp circuit 21, adjusts transformer T1, primary side feedback system 22, described
Bridge heap D3 is connect with the zero cross signal sampling module 10 and the clamp circuit 21 respectively, the clamp circuit 21 and the tune
The second auxiliary winding (i.e. the end 4-5) of whole transformer T1 connects, the first auxiliary winding (i.e. the end 1-2) of the adjustment transformer T1
It is connect with the primary side feedback system 22, the vice-side winding (i.e. the end 6-10) of the adjustment transformer T1 exports DC voltage, institute
The vice-side winding and DC voltage output end VDD of stating adjustment transformer T1 are equipped with the buffer circuit for reducing ripple and noise
23。
In power module 20, low-power consumption effect when primary side feedback system 22 can replenish standby, buffer circuit 23
It can reduce ripple, noise, to provide the reliable DC voltage of low ripple, low noise for rear end.
Specifically, the buffer circuit 23 includes third capacitor C3 and second resistance R2, the third capacitor C3 and described
Second resistance R2 is connected between the vice-side winding and the DC voltage output end VDD of the adjustment transformer T1.
In the present embodiment, the power module 20 further includes the second filter circuit, and the second filter circuit specifically uses second
Capacitor C2, second filter circuit are connect with the bridge heap D3, and the clamp circuit 21 specifically includes first resistor R1, first
Capacitor C1 and first diode D1, the first resistor R1 and the first capacitor C1 are connected in the bridge heap D3 and described in parallel
Between the cathode of first diode D1, the anode of the first diode D1 connect it is described adjustment transformer T1 second auxiliary around
Group.
The primary side feedback system 22 includes rectification circuit 221, π type filter circuit 222, phase compensating circuit 223, feedback
Circuit 224 and control chip U1, the rectification circuit 221 connect the first auxiliary winding of the adjustment transformer T1, the π type
Filter circuit 222 is separately connected the rectification circuit 221 and the control chip U1, and the phase compensating circuit 223 is connected to
Between the π type filter circuit 222 and the rectification circuit 221, the feed circuit 224 respectively with the adjustment transformer T1
The first auxiliary winding connected with the control chip U1.
Specifically, the rectification circuit 221 is made of the 4th diode D4 and the 5th resistance R5, the π type filter circuit
222 are made of the 8th resistance R8, the 9th capacitor C9, the tenth capacitor C10, for providing DC voltage, supplement to control chip U1
Low-power consumption effect when standby, the phase compensating circuit 223 are made of the 6th resistance R6 and the 7th capacitor C7, the feedback
Circuit 224 is made of the 7th resistance R7 and the 9th resistance R9.
Above-mentioned power module 20 have the advantages that low cost, colleges and universities lead, stand-by power consumption it is low, can give rear stage MCU,
OP, etc. control units, radio frequency unit provide low ripple, low noise reliable DC voltage.
The DC filtering module 30 connects the DC voltage output end VDD.In output DC voltage 5V, electric current 1A
When, ripple, noise are lower than 50mV, and it is all very outstanding in many applications, but in radio frequency unit and AFE(analog front end)
In power supply, the power-supply system that more low noise is needed in the amplification of receiving sensitivity and analog signal of radiofrequency signal is considered, just
Better active power filtering is needed to design, therefore the present embodiment also improves DC filtering module 30.
Specifically, the DC filtering module 30 includes active filter circuit, the active filter circuit is by the tenth resistance
R10, eleventh resistor R11, the 11st capacitor C11, the 12nd capacitor C12 and second operational amplifier U2 composition, the described tenth
Described in the second end connection of first end connection the DC voltage output end VDD, the eleventh resistor R11 of one resistance R11
The second end of the first end of 11st capacitor C11, the 11st capacitor C11 connects the reverse phase of the second operational amplifier U2
Input terminal, the non-inverting input terminal ground connection of the second operational amplifier U2, the tenth resistance R10 are connected to second operation
Between the inverting input terminal of amplifier U2 and the output end of the second operational amplifier U2, the of the 12nd capacitor C12
One end connects the output end of the second operational amplifier U2, and the second end of the 12nd capacitor C12 is separately connected described ten
The first end of the second end of one resistance R11 and the 11st capacitor C11.
Ripple and the reverse phase that noise enters second operational amplifier U2 by eleventh resistor R11, the 11st capacitor C11 are defeated
Inbound port, amplified output ripple, noise are that antiphase is converged in image dotted line dot by the 12nd capacitor C12,
The AC signal for not entering into the positive phase of the 11st capacitor C11 is cancelled out each other, and the smaller VCC of ripple, noise can be obtained.Meter
Calculate model are as follows: VO=Vi/[R10·R11·C11·C12·S2+ R11 (C11+C12) S+1], V hereOOutput ripple is made an uproar
Sound, ViRipple, noise for input, S are to calculate Variable Factors, are determined according to the characteristic of different operational amplifiers.At this
Ripple, the noise of the middle output direct current VCC of embodiment is 5mV hereinafter, output voltage is direct current 5V, in the case that electric current is 1A.
The reliability of circuit is verified by simulation model by the foundation and verifying of Pspice model, the results show that defeated
Enter the waveform of 1V, output only has the waveform of 140mV, and ripple and noise only have 2.9mV.In actual witness plate, the ripple of VCC
Noise is less than 50mV (output 5V/1A), and after the filtering of DC filtering module 30, Ripple Noise falls below 5mV or less.?
In the application of the present embodiment, R10=R11 is set, less than 100 ohm, C11=C12 is greater than 10uF.Therefore, above-mentioned DC filtering
Module 30 has played obviously effect in attenuating ripple, noise.
Optionally, as further optimization, the zero-crossing detection system of the present embodiment further includes filter and amplification module 40, institute
The secondary windings connection secondary induction signal end S_in of mutual inductor T1 is stated, the filter and amplification module 40 is believed with the secondary induction
Number end S_in connection.
Specifically, the filter and amplification module 40 is put including low-pass filter 41, third operational amplifier U3, the 4th operation
The non-inverting input terminal of big device U4 and anti-clutter circuit 42, the low-pass filter 41 and third operational amplifier U3 connects
It connecing, the output end of the third operational amplifier U3 connects the non-inverting input terminal of the four-operational amplifier U4, and the described 4th
The input terminal of operational amplifier U4 connects the anti-clutter circuit 42.
Wherein, low-pass filter 41 is made of the 15th capacitor C15, twelfth resistor R12, the 14th resistance R14.
The filter and amplification module 40 further comprises the 13rd capacitor C13, the 17th resistance R17, the 18th resistance
R18, the 17th capacitor C17, the 14th capacitor C14 and the 19th resistance R19, the 13rd capacitor C13 is as the third
The decoupling capacitance of operational amplifier U3, negative feedback resistor of the 17th resistance R17 as the third operational amplifier U3,
The 18th resistance R18 and the 17th capacitor C17 forms the zero compensation circuit of the third operational amplifier U3, institute
Decoupling capacitance of the 14th capacitor C14 as the four-operational amplifier U4 is stated, the 19th resistance R19 is as described
The negative feedback resistor of four-operational amplifier U4.
Output loading of the 15th resistance R15 as mutual inductor L1, filter and amplification module 40 obtain sampling obtain mutual inductance
Device sampled signal S_in, by there is low-pass filter 41 to enter in amplifier U3, while twelfth resistor R12, the 14th resistance R14
U3 bias current and voltage, F are given to VCC partial pressurehpass=1/ [2 π C15 (R12 | | R14)] (high-pass filtering cutoff frequency
Rate).C13 is the decoupling capacitance of U3, and R17 is the negative feedback resistor of U3, and R18, C17 form the zero compensation circuit of U3, zero point frequency
Rate is FZ1=1/ (2 π C17R18), the zero frequency that U3 transport and placing device is arranged here is 30Hz.By the amplified signal of U3
In-phase end into U4 amplifies.C14 is the decoupling capacitance of U4, and R19 is the negative feedback resistor of U4, and C16, R19 form U4's
Pole frequency FP1=1/ (2 π C16R19), the pole frequency that U4 is arranged herein is 70Hz.The zero point of C18, R20 composition U4
Frequency FZ2=1/ (2 π C18R20).The zero frequency that U4 is arranged herein is 40Hz.
The anti-clutter circuit 42 includes the second triode Q2, third transistor Q3, the 21st resistance R21, the
22 resistance R22, the 19th capacitor C19, the 20th capacitor C20, the signal of the four-operational amplifier U4 output, pass through
The isolation of the second triode Q2 samples, the 21st resistance R21, the 22nd resistance R22, the described 19th
Capacitor C19, the 20th capacitor C20 form the filtering of second level π type, for controlling the conducting of the third transistor Q3, thus
Allow the noise filtering of input terminal, due to having filtered out noise, required precision to operational amplifier can select precision lower
Operational amplifier can realize signal amplify, to reduce costs.
In addition, above-mentioned zero cross detection circuit, in the specific implementation, the bottom of PCB can be designed to one completely
Plane guarantees to avoid clutter interference, while having better EMC, each electronic device can be arranged in PCB in signal amplifying system
Top layer convenient for decoupling and good ground level matched signal.
In addition, being based on foregoing circuit structure, according to the interference of the waveform of signal acquisition and clutter, number is tested with oscillograph
According to consideration interference problem, the present embodiment additionally provides a jamproof filtering method, comprising:
Start；
Be delayed 5ms；
Start down trigger；
Open counter；
The time interval of adjacent rising edges in calculating；
Judge whether the time interval on two rising edge edges is greater than 1.5ms；
If so, trigger data is effective, be then delayed 5ms, opens the I/O port of output control, control output order；It returns
If not, returning to the step of starting down trigger.
To sum up, in above-mentioned zero-crossing detection system, available reliable and stable zero cross signal, while sample circuit does not damage
Consumption can save wear and tear expense, environmental protection, low-carbon for the market of this application field.In addition, the design of low noise power supply can be
The intelligent field IOT provides the minimum power-supply system of noise and powers to the radio frequency unit of equipment, improves radio-frequency performance, allows all set
Standby relatively reliable connection of interconnecting guarantees the stability of data transmission, avoids the interference of clutter, improve radio frequency unit
Receiving sensitivity.Amplify neighborhood in tiny signal, strong antijamming capability can be realized using common amplifier, low noise amplification
Characteristic, at low cost, performance is stable, reliable.
It should be pointed out that can be applied to need strong antijamming capability, zero in zero-crossing detection system provided by the invention
The system application field of the zero passage detection of loss can be applied to need low noise, high-efficiency power designing system and can be with
It is applied to realize using common amplifier, realizes the application field of low noise amplification.Such as instrument, instrument microvolt signal are put
Big field.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of zero-crossing detection system, which is characterized in that including zero cross signal sampling module, power module and DC filtering mould
Block；
The zero cross signal sampling module includes anti-lightning surge interference circuit and mutual inductor, and the anti-lightning surge interferes circuit
It is connect respectively with the armature winding of exchange firewire input terminal, AC neutral line input terminal and the mutual inductor, the anti-lightning wave
It gushes interference circuit and includes at least safety capacitor, the armature winding of the mutual inductor and the safety capacitor form the first filtered electrical
The primary windings connected in series on road, the mutual inductor accesses AC network；
The power module include bridge heap, clamp circuit, adjustment transformer, primary side feedback system, the bridge heap respectively with it is described
Zero cross signal sampling module is connected with the clamp circuit, the second auxiliary winding of the clamp circuit and the adjustment transformer
First auxiliary winding of connection, the adjustment transformer is connect with the primary side feedback system, the secondary side of the adjustment transformer
Winding exports DC voltage, and the vice-side winding of the adjustment transformer is equipped with for reducing ripple and makes an uproar with DC voltage output end
The buffer circuit of sound；
The DC filtering module connects the DC voltage output end.
2. zero-crossing detection system according to claim 1, which is characterized in that the primary side feedback system includes rectified current
Road, π type filter circuit, phase compensating circuit, feed circuit and control chip, the rectification circuit connect the adjustment transformer
The first auxiliary winding, the π type filter circuit is separately connected the rectification circuit and the control chip, the phase compensation
Be electrically connected between the π type filter circuit and the rectification circuit, the feed circuit respectively with the adjustment transformer
The first auxiliary winding connected with the control chip.
3. zero-crossing detection system according to claim 1, which is characterized in that the DC filtering module includes active power filtering
Circuit, the active filter circuit are put by the tenth resistance, eleventh resistor, the 11st capacitor, the 12nd capacitor and the second operation
Big device composition, the first end of the eleventh resistor connect the DC voltage output end, the second end of the eleventh resistor
The first end of the 11st capacitor is connected, the second end of the 11st capacitor connects the reverse phase of the second operational amplifier
Input terminal, the non-inverting input terminal ground connection of the second operational amplifier, the tenth resistance are connected to second operation amplifier
Between the inverting input terminal of device and the output end of the second operational amplifier, described in the first end connection of the 12nd capacitor
The output end of second operational amplifier, the second end of the 12nd capacitor be separately connected 11 resistance second end and
The first end of 11st capacitor.
4. zero-crossing detection system according to claim 1, which is characterized in that the zero-crossing detection system further includes that filtering is put
The secondary windings of big module, the mutual inductor connects secondary induction signal end, the filter and amplification module and the secondary induction
Signal end connection.
5. zero-crossing detection system according to claim 4, which is characterized in that the filter and amplification module includes low-pass filtering
Device, third operational amplifier, four-operational amplifier and anti-clutter circuit, the low-pass filter and the third operation
The non-inverting input terminal of amplifier connects, and the output end of the third operational amplifier connects the same phase of the four-operational amplifier
The input terminal of input terminal, the four-operational amplifier connects the anti-clutter circuit.
6. zero-crossing detection system according to claim 5, which is characterized in that the anti-clutter circuit includes the two or three
Pole pipe, third transistor, the 21st resistance, the 22nd resistance, the 19th capacitor, the 20th capacitor, the 4th operation
The signal of amplifier output is sampled by the isolation of second triode, the 21st resistance, the 22nd electricity
Resistance, the composition second level π type filtering of the 19th capacitor, the 20th capacitor, for controlling the conducting of the third transistor.
7. zero-crossing detection system according to claim 1, which is characterized in that anti-lightning surge interference circuit further includes
Varistor and insurance resistance, the varistor be connected to the exchange firewire input terminal and the AC neutral line input terminal it
Between, the insurance resistance is connected between the exchange firewire input terminal and the safety capacitor, and the buffer circuit includes the
Three capacitors and second resistance, the third capacitor and the second resistance are connected on vice-side winding and the institute of the adjustment transformer
It states between DC voltage output end.
8. zero-crossing detection system according to claim 1, which is characterized in that the power module further includes the second filtered electrical
Road, second filter circuit are connect with the bridge heap, and the clamp circuit includes first resistor, first capacitor and the one or two pole
Pipe, the first resistor and the first capacitor are connected in parallel between the bridge heap and the cathode of the first diode, institute
The anode for stating first diode connects the second auxiliary winding of the adjustment transformer.
9. zero-crossing detection system according to claim 5, which is characterized in that the filter and amplification module further includes the 13rd
Capacitor, the 17th resistance, the 18th resistance, the 17th capacitor, the 14th capacitor and the 19th resistance, the 13rd capacitor are made
For the decoupling capacitance of the third operational amplifier, negative-feedback electricity of the 17th resistance as the third operational amplifier
Resistance, the 18th resistance and the 17th capacitor form the zero compensation circuit of the third operational amplifier, and described the
Decoupling capacitance of 14 capacitors as the four-operational amplifier, the 19th resistance is as the four-operational amplifier
Negative feedback resistor.
10. according to claim 1 to zero-crossing detection system described in 9 any one, which is characterized in that the magnetic core of the mutual inductor
Using amorphous nano magnet ring, diameter 5.5mm, sensibility reciprocal 350uH, coiling uses the composite material line of 0.25mm, described compound
Line of material include 95.5% Sn, 3% Ag, 1.5% Cu, the armature winding and secondary windings of the mutual inductor are the same as mutually around 50
Circle, the sensibility reciprocal of coil are 5uH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910305914.1A CN109946506B (en) | 2019-04-16 | 2019-04-16 | Zero crossing detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910305914.1A CN109946506B (en) | 2019-04-16 | 2019-04-16 | Zero crossing detection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446936A (en) * | 2020-05-14 | 2020-07-24 | 山东恒德智能装备科技有限公司 | Instrument circuit and ship instrument adopting same |
| CN112505421A (en) * | 2020-11-16 | 2021-03-16 | 广东电网有限责任公司 | Measuring circuit for direct current resistance of dry-type air-core reactor |
| CN112540219A (en) * | 2020-11-13 | 2021-03-23 | 珠海格力电器股份有限公司 | Zero-crossing detection circuit and control circuit |
| CN116567906A (en) * | 2023-06-26 | 2023-08-08 | 江苏神州半导体科技有限公司 | Ignition circuit structure of plasma system and ignition protection method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2824296A (en) * | 1955-09-20 | 1958-02-18 | Sperry Rand Corp | Redundant fail-proof amplifier and alarm |
| CN201156708Y (en) * | 2008-01-16 | 2008-11-26 | 李党卫 | Power adapter having active power factor correcting function |
| CN205103301U (en) * | 2015-10-14 | 2016-03-23 | 嘉兴金尚节能科技有限公司 | Hourglass current detection circuit who restraines common mode interference |
| CN206250965U (en) * | 2016-11-09 | 2017-06-13 | 苏州工业职业技术学院 | Voltage adaptive Switching Power Supply |
| CN206640841U (en) * | 2017-04-10 | 2017-11-14 | 深圳天源中芯半导体有限公司 | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power |
| CN108599594A (en) * | 2018-04-03 | 2018-09-28 | 西安电子科技大学 | A kind of AC-DC Isobarically Controls converter |
| CN108667285A (en) * | 2018-04-20 | 2018-10-16 | 深圳市芯飞凌半导体有限公司 | Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship |
| CN208369896U (en) * | 2017-12-27 | 2019-01-11 | 东莞市盈聚电源有限公司 | A kind of anti-lightning LED drive circuit |
| CN109214377A (en) * | 2018-07-27 | 2019-01-15 | 深圳市闿思科技有限公司 | Sequence number recognition methods, system, mobile terminal and storage medium |
-
2019
- 2019-04-16 CN CN201910305914.1A patent/CN109946506B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2824296A (en) * | 1955-09-20 | 1958-02-18 | Sperry Rand Corp | Redundant fail-proof amplifier and alarm |
| CN201156708Y (en) * | 2008-01-16 | 2008-11-26 | 李党卫 | Power adapter having active power factor correcting function |
| CN205103301U (en) * | 2015-10-14 | 2016-03-23 | 嘉兴金尚节能科技有限公司 | Hourglass current detection circuit who restraines common mode interference |
| CN206250965U (en) * | 2016-11-09 | 2017-06-13 | 苏州工业职业技术学院 | Voltage adaptive Switching Power Supply |
| CN206640841U (en) * | 2017-04-10 | 2017-11-14 | 深圳天源中芯半导体有限公司 | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power |
| CN208369896U (en) * | 2017-12-27 | 2019-01-11 | 东莞市盈聚电源有限公司 | A kind of anti-lightning LED drive circuit |
| CN108599594A (en) * | 2018-04-03 | 2018-09-28 | 西安电子科技大学 | A kind of AC-DC Isobarically Controls converter |
| CN108667285A (en) * | 2018-04-20 | 2018-10-16 | 深圳市芯飞凌半导体有限公司 | Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship |
| CN109214377A (en) * | 2018-07-27 | 2019-01-15 | 深圳市闿思科技有限公司 | Sequence number recognition methods, system, mobile terminal and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 李琳 等: "一种低压TSC的过零触发电路设计", 《工业控制计算机》, vol. 28, no. 3, pages 171 - 172 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446936A (en) * | 2020-05-14 | 2020-07-24 | 山东恒德智能装备科技有限公司 | Instrument circuit and ship instrument adopting same |
| CN111446936B (en) * | 2020-05-14 | 2023-08-25 | 山东恒力电机有限公司 | Instrument circuit and ship instrument adopting same |
| CN112540219A (en) * | 2020-11-13 | 2021-03-23 | 珠海格力电器股份有限公司 | Zero-crossing detection circuit and control circuit |
| CN112505421A (en) * | 2020-11-16 | 2021-03-16 | 广东电网有限责任公司 | Measuring circuit for direct current resistance of dry-type air-core reactor |
| CN116567906A (en) * | 2023-06-26 | 2023-08-08 | 江苏神州半导体科技有限公司 | Ignition circuit structure of plasma system and ignition protection method |
| CN116567906B (en) * | 2023-06-26 | 2024-01-30 | 江苏神州半导体科技有限公司 | Ignition circuit structure of plasma system and ignition protection method |
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