CN208109925U - A kind of zero-crossing detection system of alternating current and electronic equipment with the system - Google Patents
A kind of zero-crossing detection system of alternating current and electronic equipment with the system Download PDFInfo
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- CN208109925U CN208109925U CN201721896396.8U CN201721896396U CN208109925U CN 208109925 U CN208109925 U CN 208109925U CN 201721896396 U CN201721896396 U CN 201721896396U CN 208109925 U CN208109925 U CN 208109925U
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Abstract
The utility model provides a kind of zero-crossing detection system of alternating current and the electronic equipment with the system, the zero-crossing detection system of alternating current include：Detection module and zero cross signal output module connected to it；Wherein, if being started to charge inside detection module, it is to be charged to after the first burning voltage, the voltage of first input end is begun to decline, when being down to the second burning voltage, it is connected between detection module and zero cross signal output module, discharges inside detection module zero cross signal output module, to be converted for indicating that positive half-wave is converted to the zero cross signal of the zero crossing of negative half-wave or negative half-wave to the zero cross signal of the zero crossing of positive half-wave by the output of zero cross signal output module.The utility model can promote the reliability of power line carrier communication, it avoids carrying out data transmission near the peak valley point of line voltage, and selects to carry out data transmission before and after the zero crossing of line voltage, reduction can be negatively affected caused by the capacitance charging current by impulse type, and low cost, low-power consumption.
Description
Technical field
The utility model belongs to power line carrier communication field, is related to a kind of detection system, more particularly to a kind of exchange
Electric zero-crossing detection system and the electronic equipment with the system.
Background technique
Electric main zero passage detection refers to electric main waveform from negative half-wave to positive half-wave or from positive half-wave to negative half-wave
In conversion process, the detection at zero potential moment is passed through to it.
With common wireless communication comparatively, the main function of power line is the transmission of carrying electric energy rather than signal biography
Defeated, power line channel has its particularity, is mainly manifested in：Due to a large amount of rectifying and wave-filtering types load (especially mains lighting supply, open
Powered-down source etc. load) presence, near the peak, valley point of line voltage, the capacitance charging current that will form pulse shape is (such as attached
Shown in Fig. 1).According to R=U/I, the maximum of electric current will lead to substitutional connection impedance pole near the peak, valley point of line voltage
The appearance of small value (shows through actual test in certain frequency ranges, voltage Power Line Carrier Channel impedance can be down near voltage peak-to-valley value
0.1 ohm).And the minimum of line impedance will lead to two problems：
1, the equivalent load of carrier signal power amplifier is near short circuit, to the output energy of carrier signal power amplifier
Power, short-circuit protection ability propose very high requirement；
2, the energy for being coupled to the carrier signal on route is eaten up by capacitance charging current, without being really loaded into route
On transmitted.
Due to the presence of above-mentioned two problems, near the peak-to-valley value of line voltage, the communication performance right and wrong of carrier communication
It is often poor.
Current zero passage detection method is as follows：
The first zero passage detection method is needed using additional capacitor, should to generate power supply (both ends VD2) all the way
Capacitor needs to increase system cost using the biggish safety capacitor of expensive, volume；It needs using Darlington triode
VT1 increases system cost.
Second of zero passage detection method, which is not done among storage capacitor and zener diode, is isolated, when alternating current is by just
When the negative half-wave of half wave direction is converted, the charge stored in storage capacitor can return to city's electrical circuit, increase power consumption.
Therefore, how a kind of zero-crossing detection system of alternating current and the electronic equipment with the system are provided, it is existing to solve
There is the defects of zero cross detection circuit is at high cost, circuit is complicated, power consumption is big, has become those skilled in the art's skill urgently to be resolved in fact
Art problem.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide a kind of inspections of the zero passage of alternating current
Examining system and electronic equipment with the system, for solving, existing zero cross detection circuit is at high cost, circuit is complicated, power consumption is big
Problem.
In order to achieve the above objects and other related objects, on the one hand the utility model provides the zero passage detection of a kind of alternating current
System, the positive half-wave for detecting alternating current are converted to the zero crossing of negative half-wave and/or negative half-wave and are converted to the zero passage of positive half-wave
Point；The zero-crossing detection system of the alternating current includes：Detection module and zero cross signal output module connected to it；Wherein, if
It is started to charge inside the detection module, it is to be charged that after the first burning voltage, the voltage of the first input end is begun to decline,
When being down to the second burning voltage, be connected between the detection module and the zero cross signal output module, the detection module
Inside discharges to the zero cross signal output module, to be used to indicate just half by zero cross signal output module output
Wave is converted to the zero cross signal of the zero crossing of negative half-wave or negative half-wave and is converted to the zero cross signal of the zero crossing of positive half-wave；Or it is described
The zero-crossing detection system of alternating current includes：Positive half-wave for detecting alternating current is converted to the first detection of the zero crossing of negative half-wave
Module and the first zero cross signal output module, the negative half-wave for detecting alternating current are converted to the second inspection of the zero crossing of positive half-wave
Survey module and the second zero cross signal output module；It is in parallel with the first detection module and the first zero cross signal output module；Its
In, to be charged to after the first burning voltage if being started to charge inside the first detection module, the voltage of the first input end
It begins to decline, when being down to the second burning voltage, between the first detection module and the first zero cross signal output module
It is connected, discharges inside the first detection module the first zero cross signal output module, to pass through first mistake
Zero-signal output module is exported for indicating that positive half-wave converts the zero cross signal of the zero crossing to negative half-wave；If second detection
Inside modules start to charge, and to be charged to after the first burning voltage, the voltage of the first input end is begun to decline, wait be down to
It when two burning voltages, is connected between second detection module and the second zero cross signal output module, second detection
Inside modules discharge to the second zero cross signal output module, to be exported by the second zero cross signal output module
For indicating that negative half-wave is converted to the zero cross signal of the zero crossing of positive half-wave.
In an embodiment of the utility model, the zero-crossing detection system of the alternating current further includes and the detection module
The current limliting module of electric connection, for limiting the electric current drawn from the alternating current.
In an embodiment of the utility model, be provided with for receiving the alternating current two of the current limliting module are defeated
Enter end, first resistor is connected after an input terminal, or connect the first resistor after another input terminal, or in two input terminals
After be separately connected the first resistor.
In an embodiment of the utility model, when the alternating current is 220V line voltage, the first resistor
Resistance value is greater than 470K Ω；Or the resistance value summation of first resistor is greater than 470K Ω.
In an embodiment of the utility model, the detection module includes voltage-stabiliser tube, diode, storage capacitor and three poles
Pipe；When the triode is PNP type triode, the cathode of the voltage-stabiliser tube and the anode of diode are connected, the diode
Cathode and one end of storage capacitor connect, the anode of the other end of the storage capacitor and voltage-stabiliser tube connects, the positive-negative-positive three
The base stage of pole pipe and the anode of diode connect, and one end of emitter and storage capacitor connects, and collector connects the zero passage letter
One input terminal of number output module；When the triode NPN type triode, the cathode of the anode and diode of the voltage-stabiliser tube
One end of connection, the cathode of the voltage-stabiliser tube and storage capacitor connects, and the anode of the diode is another with the storage capacitor
One end connection, the collector of the NPN type triode are connect with the cathode of the diode, one end of emitter and storage capacitor
Connection, collector connect another input terminal of the zero cross signal output module.
In an embodiment of the utility model, the zero cross signal output module includes second resistance, photoelectrical coupler
And 3rd resistor；Wherein, one end of the second resistance is connected to an output end of the detection module, the second resistance
The other end is connect with the anode of light emitting diode in photoelectrical coupler, the cathode of light emitting diode and the inspection in photoelectrical coupler
Survey another output end connection of module；Or in photoelectrical coupler light emitting diode anode, shine two in the photoelectrical coupler
The cathode of pole pipe is connect with one end of the second resistance, an output of the other end of the second resistance and the detection module
End connection；When the photoelectrical coupler exports the zero cross signal using the emitter of phototriode, the 3rd resistor
One end be connected to the emitter of the phototriode, the other end ground connection of the 3rd resistor；When the photoelectrical coupler
When exporting the zero cross signal using the collector of phototriode, one end of the 3rd resistor and the phototriode
Collector connection, the other end of the 3rd resistor connect a voltage source, the emitter ground connection of phototriode.
In an embodiment of the utility model, the first detection module includes the first voltage-stabiliser tube, first diode, the
One storage capacitor and the first triode；When first triode be PNP type triode when, the cathode of first voltage-stabiliser tube with
The anode connection of first diode, the cathode of the first diode are connect with one end of the first storage capacitor, first storage
The other end of energy capacitor is connect with the anode of the first voltage-stabiliser tube, the base stage of the PNP type triode and the anode of first diode
Connection, emitter connect with one end of the first storage capacitor, and it is one defeated to connect the first zero cross signal output module for collector
Enter end；When the first triode NPN type triode, the anode of first voltage-stabiliser tube connects with the cathode of first diode
It connects, the cathode of first voltage-stabiliser tube is connect with one end of the first storage capacitor, the anode of the first diode and described the
The other end of one storage capacitor connects, and the collector of the NPN type triode is connect with the cathode of the first diode, emits
Pole is connect with one end of the first storage capacitor, and collector connects another input terminal of the first zero cross signal output module.
In an embodiment of the utility model, second detection module includes the second voltage-stabiliser tube, the second diode, the
Two storage capacitors and the second triode；When second triode be PNP type triode when, the cathode of second voltage-stabiliser tube with
The anode connection of second diode, the cathode of second diode are connect with one end of the second storage capacitor, second storage
The other end of energy capacitor is connect with the anode of the second voltage-stabiliser tube, the anode of the base stage of the PNP type triode and the second diode
Connection, emitter connect with one end of the second storage capacitor, and it is one defeated to connect the second zero cross signal output module for collector
Enter end；When the second triode NPN type triode, the anode of second voltage-stabiliser tube connects with the cathode of the second diode
It connects, the cathode of second voltage-stabiliser tube is connect with one end of the second storage capacitor, the anode of second diode and described the
The other end of two storage capacitors connects, and the collector of the NPN type triode is connect with the cathode of second diode, emits
Pole is connect with one end of the second storage capacitor, and collector connects another input terminal of the second zero cross signal output module.
On the other hand the utility model provides a kind of electronic equipment, including：The zero-crossing detection system of the alternating current.
As described above, the detection system of the alternating current of the utility model and the electronic equipment with the system, have following
Beneficial effect：
The detection system of alternating current described in the utility model and electronic equipment with the system are able to ascend power line load
The reliability of wave communication avoids and carries out data transmission near the peak valley point of line voltage, and selects the mistake in line voltage
Carry out data transmission before and after zero point, can negatively affect caused by the capacitance charging current by impulse type reduces, and have it is low at
This, low-power consumption, the simple advantage of structure.
Detailed description of the invention
Fig. 1 is shown as the peak of the line voltage of the prior art, valley point is formed about the capacitance charging current of pulse shape and shows
It is intended to.
Fig. 2A is shown as theory structure signal of the zero-crossing detection system of the alternating current of the utility model in an embodiment
Figure.
Fig. 2 B is shown as a kind of implementing circuit figure of the zero-crossing detection system of the alternating current of the utility model.
Fig. 3 is shown as another embodiment circuit of detection module in the zero-crossing detection system of the alternating current of the utility model
Figure.
Fig. 4 A is shown as a kind of implementation electricity of zero passage output module in the zero-crossing detection system of the alternating current of the utility model
Lu Tu
Fig. 4 B, which is shown as the another of zero passage output module in the zero-crossing detection system of the alternating current of the utility model, to be implemented
Circuit diagram.
Fig. 5 be shown as the zero-crossing detection system of the alternating current of the utility model in another implementing circuit schematic diagram.
Component label instructions
The zero-crossing detection system of 2 alternating currents
21 current limliting modules
22 detection modules
23 zero cross signal output modules
The zero-crossing detection system of 5 alternating currents
50 current limliting modules
51 first detection modules
52 first zero cross signal output modules
53 second detection modules
54 second zero cross signal output modules
Specific embodiment
Illustrate the embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition
Different specific embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints and answer
With carrying out various modifications or alterations under the spirit without departing from the utility model.It should be noted that the case where not conflicting
Under, the feature in following embodiment and embodiment can be combined with each other.
It should be noted that diagram provided in following embodiment only illustrates the basic of the utility model in a schematic way
Conception, only shown in schema then with related component in the utility model rather than component count when according to actual implementation, shape
And size is drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout
Kenel may also be increasingly complex.
Embodiment one
The present embodiment provides a kind of zero-crossing detection systems of alternating current, and the positive half-wave for detecting alternating current is converted to negative half
The zero crossing of wave or negative half-wave are converted to the zero crossing of positive half-wave；The zero-crossing detection system of the alternating current includes：Detection module
With zero cross signal output module connected to it；
Wherein, if starting to charge inside the detection module, to be charged to after the first burning voltage, described first is defeated
The voltage for entering end is begun to decline, and when being down to the second burning voltage, the detection module and the zero cross signal output module it
Between be connected, discharge inside the detection module the zero cross signal output module, to be exported by the zero cross signal
Module output is converted for indicating that positive half-wave is converted to the zero cross signal of the zero crossing of negative half-wave or negative half-wave to the mistake of positive half-wave
The zero cross signal of zero point.
The zero-crossing detection system of alternating current provided by the present embodiment is described in detail below with reference to diagram.This reality
The positive half-wave that the zero-crossing detection system for applying alternating current described in example is applied to detect electric main is converted to the zero crossing of negative half-wave
Or negative half-wave is converted to the zero crossing of positive half-wave.Fig. 2A and 2B are please referred to, the zero-crossing detection system for being shown as alternating current is real in one
Apply a kind of implementing circuit figure of the zero-crossing detection system of the theory structure schematic diagram and alternating current in example.As shown in Figure 2 A, described
The zero-crossing detection system 2 of alternating current includes current limliting module 21, detection module 22 and zero cross signal output module 23.
The current limliting module 21 is used to limit the electric current drawn from the alternating current.In the present embodiment, the current limliting mould
Two input terminals of block 21 are initiated sb. into monkhood or numhood at zero curve/firewire input both ends of electric main.The current limliting module 2, which is provided with, to be used for
Two input terminals for receiving the alternating current, connect first resistor after an input terminal, or after another input terminal described in connection
First resistor, or the first resistor is separately connected after two input terminals.For example, refering to Fig. 2 B, the current limliting module 21
One input terminal connects first resistor R1.In the present embodiment, if when the alternating current is 220V line voltage, first electricity
The resistance value for hindering R1 is greater than 470K Ω.Preferably, the resistance value of first resistor R1 is greater than 2M Ω and even reaches 5M Ω, so as to
Under conditions of 220V electric main by the power consumption control of this zero cross detection circuit within 25~10 milliwatts.Or at two
When being separately connected the first resistor after input terminal, the summation of first resistor is greater than 470K Ω.
The detection module 22 connecting with the 21 of the current limliting module two output ends is for starting to be filled inside it
Electricity, to be charged to after the first burning voltage, the voltage of first input end A (A electricity as shown in Figure 2 B) is begun to decline, wait be down to
It when the second burning voltage, is connected between the detection module and the zero cross signal output module, inside the detection module 22
It discharges the zero cross signal output module 23, to be used to indicate just half by the zero cross signal output module 23 output
Wave converts the zero cross signal of the zero crossing to negative half-wave.
Specifically, the detection module includes voltage-stabiliser tube D1, diode D2, capacitor C1 and triode Q1.
As shown in Figure 2 B, when the triode Q1 is PNP type triode, the cathode and diode of the voltage-stabiliser tube D1
The anode connection of D2, the cathode of the diode D2 are connect with one end of capacitor C, the other end and voltage-stabiliser tube D1 of the capacitor C1
Anode connection, the positive of the base stage B and diode D2 of the PNP type triode connect, one end of emitter E and capacitor C1
Connection, collector C connect an input terminal of the zero cross signal output module 23.
Wherein, the pressure stabilizing value of zener diode D1 is VDW, diode D2 conduction voltage drop be VF, triode Q1 unlatching electricity
Pressure is VBE.As shown in Figure 2 B, in A (first input end of detection module 22) point voltage, higher than B point, (the second of detection module 22 is defeated
Enter end) voltage when, i.e., the positive half-wave of line voltage, A point voltage charge to storage capacitor C1 by diode D2,
A point voltage is higher than C point voltage at this time, and PNP type triode Q1 is in off state, and C1 gradually charges to the first burning voltage VDW-
VF.A point voltage declines later, and due to the presence of diode D2, the charge stored on storage capacitor C1 will not be lost, when A point electricity
The second burning voltage V is down in pressureDW-VF-VBEWhen, storage capacitor C1 and zero cross signal are exported mould by PNP type triode Q1 conducting
Block 23 (in the present embodiment, the zero cross signal output module 23 is isolation circuit) is connected.The storage capacitor C1 is in alternating current
The positive half-wave of voltage carries out charging at a slow speed when converting negative half-wave, so as to reduce the power demands to alternating current, high degree
On reduce the power consumption of integrated circuit.
Referring to Fig. 3, being shown as another embodiment circuit diagram of detection module.As shown in figure 3, working as the triode
When NPN type triode, the anode of the voltage-stabiliser tube is connect with the cathode of diode, and the one of the cathode of the voltage-stabiliser tube and capacitor
The anode of end connection, the diode is connect with the other end of the capacitor, the collector of the NPN type triode and described two
The cathode of pole pipe connects, and one end of emitter and capacitor connects, and collector connects the another defeated of the zero cross signal output module
Enter end.
Wherein, the pressure stabilizing value of zener diode D1 is VDW, diode D2 conduction voltage drop be VF, triode Q1 unlatching electricity
Pressure is VBE.As shown in Figure 2 B, in A ' (first input end of detection module 22) point voltage lower than B ' point (the of detection module 22
Two input terminals) voltage when, i.e. the positive half-wave of line voltage, A ' puts voltage and is carried out by diode D2 to storage capacitor C1
Charging, A ' puts voltage and puts voltage lower than C ' at this time, and NPN type triode Q1 ' is in off state, and it is steady that C1 ' gradually charges to first
Constant voltage VDW-VF.A ' puts voltage decline later, and due to the presence of diode D2, the charge stored on storage capacitor C1 ' will not flow
It loses, works as B ' point voltage and drop to the second burning voltage VDW-VF-VBEWhen, NPN type triode Q1 ' conducting, by storage capacitor C1 ' and
Zero cross signal output module 23 (in the present embodiment, the zero cross signal output module 23 is isolation circuit) is connected.The storage
Energy capacitor C1 ' carries out charging at a slow speed when the positive half-wave of line voltage converts negative half-wave, so as to reduce the confession to alternating current
Electricity demanding largely reduces the power consumption of integrated circuit.
With continued reference to Fig. 2 B, the zero passage output module 23 includes second resistance R2, photoelectrical coupler OPT1 and third electricity
Hinder R3.
Fig. 4 A and 4B are please referred to, one kind and another kind implementing circuit figure of zero passage output module are shown as.Second electricity
One end of resistance R2 is connected to an output end of the detection module 22, the other end and photoelectrical coupler of the second resistance R2
The anode of light emitting diode connects in OPT1, the cathode and the detection module 22 of light emitting diode in photoelectrical coupler OPT1
Another output end connection；Or in photoelectrical coupler OPT1 light emitting diode anode, shine in the photoelectrical coupler OPT1
The cathode of diode is connect with one end of the second resistance R2, the other end of the second resistance R2 and the detection module 22
An output end connection.
The zero passage output module includes another and another embodiment.As the photoelectrical coupler OPT1 photosensitive three
When the emitter of pole pipe exports the zero cross signal, one end of the 3rd resistor R3 is connected to the transmitting of the phototriode
The other end of pole E, the 3rd resistor R3 are grounded；When the photoelectrical coupler OPT1 is defeated using the collector C of phototriode
Out when the zero cross signal, one end of the 3rd resistor R3 is connect with the collector C of the phototriode, the third electricity
The other end for hindering OPT1 connects a voltage source, the emitter E ground connection of phototriode.
In the present embodiment, the energy storage electricity when positive half-wave of line voltage is transformed into negative half-wave in detection module 22
Hold C1 and repid discharge is carried out to the photoelectrical coupler in zero cross signal output module 23, thus in zero cross signal output module 23
Output end obtain a pulse edge precipitous enough.
The detection system of alternating current described in the present embodiment is able to ascend the reliability of power line carrier communication, avoids in city
The peak valley point of piezoelectric voltage nearby carries out data transmission, and selects to carry out data transmission before and after the zero crossing of line voltage, can be with
Negatively affecting caused by capacitance charging current by impulse type reduces, and has low cost, low-power consumption, the simple advantage of structure.
Embodiment two
The present embodiment provides a kind of zero-crossing detection systems of alternating current, and the positive half-wave for detecting alternating current is converted to negative half
The zero crossing of wave and negative half-wave are converted to the zero crossing of positive half-wave；The zero-crossing detection system of the alternating current includes：
Positive half-wave for detecting alternating current is converted to the first detection module of the zero crossing of negative half-wave and the first zero passage letter
Number output module,
Negative half-wave for detecting alternating current is converted to the second detection module of the zero crossing of positive half-wave and the second zero passage letter
Number output module；It is in parallel with the first detection module and the first zero cross signal output module；
Wherein, if starting to charge inside the first detection module, to be charged to after the first burning voltage, described first is defeated
The voltage for entering end is begun to decline, and when being down to the second burning voltage, the first detection module and first zero cross signal are defeated
It is connected, discharges inside the first detection module the first zero cross signal output module, to pass through between module out
The first zero cross signal output module output is for indicating that positive half-wave converts the zero cross signal of the zero crossing to negative half-wave；
It is to be charged to after the first burning voltage if being started to charge inside second detection module, the first input end
Voltage begin to decline, when being down to the second burning voltage, second detection module and second zero cross signal export mould
It is connected between block, discharges inside second detection module the second zero cross signal output module, by described
Second zero cross signal output module is exported for indicating that negative half-wave is converted to the zero cross signal of the zero crossing of positive half-wave.
The zero-crossing detection system of alternating current provided by the present embodiment is described in detail below with reference to diagram.It please join
Read Fig. 5, be shown as the zero-crossing detection system of alternating current in another implementing circuit schematic diagram.As shown in figure 5, shown alternating current
Zero-crossing detection system 5 include：Current limliting module 50；Positive half-wave for detecting alternating current is converted to the of the zero crossing of negative half-wave
One detection module 51 and the first zero cross signal output module 52；Negative half-wave for detecting alternating current is converted to the zero passage of positive half-wave
The second detection module 53 and the second zero cross signal output module 54 of point.
The first detection module 51 and the first zero cross signal output module 52 and second detection module 53 and second
Zero cross signal output module 54 is connected in parallel.
In this present embodiment, the current limliting module 50 is used to limit the electric current drawn from the alternating current.In the present embodiment
In, two input terminals of the current limliting module 50 are initiated sb. into monkhood or numhood at zero curve/firewire input both ends of electric main.The current limliting module
50 are provided with two input terminals for receiving the alternating current, connected after an input terminal two first resistor R1 in parallel and
R1 ', or two first resistor R1 and R1 ' in parallel are connected after another input terminal, or be separately connected two after two input terminals
The first resistor R1 and R1 ' of a parallel connection.
The first detection module 51 includes the first voltage-stabiliser tube D1, first diode D2, the first storage capacitor C1 and first
Triode Q1.
With continued reference to Fig. 5, when first triode is PNP type triode, the cathode of the first voltage-stabiliser tube D1 with
The anode connection of first diode D2, the cathode of the first diode D2 is connect with one end of the first storage capacitor C1, described
The other end of first storage capacitor C1 is connect with the anode of the first voltage-stabiliser tube D1, the base stage and first of the PNP type triode Q1
The anode connection of diode D2, emitter are connect with one end of the first storage capacitor C1, and collector connects the first zero passage letter
One input terminal of number output module 52.
When the first triode NPN type triode, the anode and the cathode of first diode of first voltage-stabiliser tube
Connection, the cathode of first voltage-stabiliser tube connect with one end of the first storage capacitor, the first diode it is positive with it is described
The other end of first storage capacitor connects, and the collector of the NPN type triode is connect with the cathode of the first diode, sends out
Emitter-base bandgap grading is connect with one end of the first storage capacitor, and collector connects another input terminal of the first zero cross signal output module.
Refering to Fig. 5, second detection module includes the second voltage-stabiliser tube D1 ', the second diode D2 ', the second storage capacitor
C1 ' and the second triode Q1 '.
When the second triode Q1 ' is PNP type triode, the cathode of the second voltage-stabiliser tube D1 ' and the two or two pole
The anode connection of pipe D2 ', the cathode of the second diode D2 ' are connect with one end of the second storage capacitor C1 ', second storage
The other end of energy capacitor C1 ' is connect with the anode of the second voltage-stabiliser tube D1 ', the base stage of the PNP type triode and the second diode
The anode connection of D2 ', emitter are connect with one end of the second storage capacitor C1 ', and it is defeated that collector connects second zero cross signal
An input terminal of module 54 out.
When the second triode NPN type triode, the cathode of the anode and the second diode of second voltage-stabiliser tube
Connection, the cathode of second voltage-stabiliser tube connect with one end of the second storage capacitor, second diode it is positive with it is described
The other end of second storage capacitor connects, and the collector of the NPN type triode is connect with the cathode of second diode, sends out
Emitter-base bandgap grading is connect with one end of the second storage capacitor, and collector connects another input terminal of the second zero cross signal output module.
With continued reference to Fig. 5, the first zero passage output module 52 includes second resistance R2, photoelectrical coupler OPT1 and third
Resistance R3.The second zero passage output module 54 includes second resistance R2 ', photoelectrical coupler OPT1 ' and 3rd resistor R3 '.
One end of the second resistance R2 is connected to an output end of the first detection module 51, the second resistance R2
The other end in photoelectrical coupler OPT1 light emitting diode anode connect, in photoelectrical coupler OPT1 light emitting diode bear
Pole connect with another output end of the detection module 22 or photoelectrical coupler OPT1 in light emitting diode anode, the light
The cathode of light emitting diode is connect with one end of the second resistance R2 in electric coupler OPT1, and the second resistance R2's is another
End is connect with an output end of the detection module 22.
One end of the second resistance R2 ' is connected to an output end of second detection module 53, the second resistance
The other end of R2 ' is connect with the anode of light emitting diode in photoelectrical coupler OPT1 ', light-emitting diodes in photoelectrical coupler OPT1 '
The cathode of pipe is connect with another output end of second detection module 53.Or light emitting diode in photoelectrical coupler OPT1 '
Anode, the cathode of light emitting diode is connect with one end of the second resistance R2 ' in the photoelectrical coupler OPT1 ', and described
The other end of two resistance R2 ' is connect with an output end of second detection module 53.
When the emitter of the photoelectrical coupler OPT1 phototriode exports the zero cross signal, the 3rd resistor
One end of R3 is connected to the emitter E of the phototriode, the other end ground connection of the 3rd resistor R3；When the photoelectricity
When coupler OPT1 exports the zero cross signal using the collector C of phototriode, one end of the 3rd resistor R3 and institute
The collector C connection of phototriode is stated, the other end of the 3rd resistor OPT1 connects a voltage source, the hair of phototriode
Emitter-base bandgap grading E ground connection.
In the present embodiment, the pressure stabilizing value of the first zener diode D1 is VDW, first diode D2 conduction voltage drop be VF、
The cut-in voltage of first triode Q1 is VBE.As shown in figure 5, high in A (first input end of first detection module 51) point voltage
When B point (the second input terminal of first detection module 51) voltage, i.e. the positive half-wave of line voltage, A point voltage passes through the
One diode D2 charges to the first storage capacitor C1, and A point voltage is higher than C point voltage at this time, at the first triode of positive-negative-positive Q1
In off state, C1 gradually charges to the first burning voltage VDW-VF.A point voltage declines later, due to depositing for first diode D2
The charge stored on the first storage capacitor C1 will not be lost, when A point voltage drops to the second burning voltage VDW-VF-VBEWhen,
PNP type triode Q1 conducting, the first storage capacitor C1 and the first zero cross signal output module 52 is (in the present embodiment, described
First zero cross signal output module 52 is isolation circuit) it connects.The first storage capacitor C1 turns in the positive half-wave of line voltage
The charging carried out when changing negative half-wave at a slow speed largely reduces whole electricity so as to reduce the power demands to alternating current
The power consumption on road.The first storage capacitor when the positive half-wave of line voltage is transformed into negative half-wave, in first detection module 51
C1 carries out repid discharge to the photoelectrical coupler OPT1 in the first zero cross signal output module 52, thus defeated in the first zero cross signal
The output end of module 52 obtains a pulse edge precipitous enough out.
In the present embodiment, the pressure stabilizing value of the second zener diode D1 ' is VDW, the second diode D2 conduction voltage drop be
VF, the second triode Q1 cut-in voltage be VBE.As shown in figure 5, in A ' (first input end of the second detection module 53) point electricity
(it is absolute voltage value, B ' point electricity that A ', which puts voltage, when pressure is higher than B ' point (the second input terminal of the second detection module 53) voltage
Pressure is absolute voltage value), i.e., the negative half-wave of line voltage, A ' put voltage by the second diode D2 ' to the second storage capacitor
C1 ' is charged and (is filled with negative voltage on second storage capacitor), and A ' puts voltage and puts voltage, positive-negative-positive second higher than C ' at this time
Triode Q1 ' is in off state, and C1 ' gradually charges to the first burning voltage VDW-VF.A ' puts voltage decline later, due to the
The presence of two diode D2 ', the charge stored on the second storage capacitor C1 ' will not be lost, and working as A ' point voltage, to drop to second steady
Constant voltage VDW-VF-VBEWhen, PNP type triode Q1 conducting, by the second storage capacitor C1 ' and the second zero cross signal output module 54
(in the present embodiment, the second zero cross signal output module 54 is isolation circuit) connects.The second storage capacitor C1 ' exists
The negative half-wave of line voltage carries out charging at a slow speed when converting positive half-wave, so as to reduce the power demands to alternating current, greatly
The power consumption of integrated circuit is reduced in degree.When the negative half-wave of line voltage is transformed into positive half-wave, the second detection module
The second storage capacitor C1 ' in 53 carries out repid discharge to the photoelectrical coupler OPT1 in the second zero cross signal output module 54,
To which the output end in the second zero cross signal output module 54 obtains a pulse edge precipitous enough.
Embodiment three
The present embodiment provides a kind of electronic equipment, including：The zero-crossing detection system of alternating current as described in embodiment one, or it is real
Apply the zero-crossing detection system of alternating current described in example two.
In conclusion the detection system of alternating current described in the utility model and the electronic equipment with the system are able to ascend
The reliability of power line carrier communication avoids and carries out data transmission near the peak valley point of line voltage, and selects in alternating current
Carry out data transmission before and after the zero crossing of voltage, reduction can be negatively affected caused by the capacitance charging current by impulse type, and
With low cost, low-power consumption, the simple advantage of structure.So the utility model effectively overcome it is in the prior art it is various lack
It puts and has high industrial utilization value.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications or change completed under mind and technical idea, should be covered by the claim of the utility model.
Claims (9)
1. a kind of zero-crossing detection system of alternating current, which is characterized in that the positive half-wave for detecting alternating current is converted to negative half-wave
Zero crossing and/or negative half-wave convert to the zero crossing of positive half-wave；The zero-crossing detection system of the alternating current includes：Current limliting mould
Block, detection module and zero cross signal output module connected to it；
Wherein, to be charged to after the first burning voltage if being started to charge inside the detection module, the first of the current limliting module
The voltage of input terminal is begun to decline, when being down to the second burning voltage, the detection module and the zero cross signal output module
Between be connected, discharge inside the detection module the zero cross signal output module, with by the zero cross signal it is defeated
Module output out is converted for indicating that positive half-wave is converted to the zero cross signal of the zero crossing of negative half-wave or negative half-wave to positive half-wave
The zero cross signal of zero crossing；Or
The zero-crossing detection system of the alternating current includes：
Positive half-wave for detecting alternating current is converted defeated to the first detection module of the zero crossing of negative half-wave and the first zero cross signal
Module out,
Negative half-wave for detecting alternating current is converted defeated to the second detection module of the zero crossing of positive half-wave and the second zero cross signal
Module out；It is in parallel with the first detection module and the first zero cross signal output module；
Wherein, to be charged to after the first burning voltage if being started to charge inside the first detection module, the first input end
Voltage begin to decline, when being down to the second burning voltage, the first detection module and first zero cross signal export mould
It is connected between block, discharges inside the first detection module the first zero cross signal output module, by described
First zero cross signal output module is exported for indicating that positive half-wave converts the zero cross signal of the zero crossing to negative half-wave；
It is to be charged to after the first burning voltage if being started to charge inside second detection module, the electricity of the first input end
Pressure is begun to decline, when being down to the second burning voltage, second detection module and the second zero cross signal output module it
Between be connected, discharge inside second detection module the second zero cross signal output module, with pass through described second
Zero cross signal output module is exported for indicating that negative half-wave is converted to the zero cross signal of the zero crossing of positive half-wave.
2. the zero-crossing detection system of alternating current according to claim 1, which is characterized in that the zero passage detection of the alternating current
System further includes the current limliting module being electrically connected with the detection module, for limiting the electric current drawn from the alternating current.
3. the zero-crossing detection system of alternating current according to claim 2, which is characterized in that the current limliting module setting is useful
In two input terminals for receiving the alternating current, first resistor is connected after an input terminal, or institute is connected after another input terminal
First resistor is stated, or is separately connected the first resistor after two input terminals.
4. the zero-crossing detection system of alternating current according to claim 3, which is characterized in that the alternating current be the city 220V
When piezoelectric voltage, the resistance value of the first resistor is greater than 470 kilo-ohms；Or the resistance value summation of first resistor is greater than 470 kilo-ohms.
5. the zero-crossing detection system of alternating current according to claim 2, which is characterized in that the detection module includes pressure stabilizing
Pipe, diode, storage capacitor and triode；
When the triode is PNP type triode, the cathode of the voltage-stabiliser tube and the anode of diode are connected, the diode
Cathode and one end of storage capacitor connect, the anode of the other end of the storage capacitor and voltage-stabiliser tube connects, the positive-negative-positive three
The base stage of pole pipe and the anode of diode connect, and one end of emitter and storage capacitor connects, and collector connects the zero passage letter
One input terminal of number output module；
When the triode is NPN type triode, the anode of the voltage-stabiliser tube is connect with the cathode of diode, the voltage-stabiliser tube
Cathode and storage capacitor one end connect, the diode anode connect with the other end of the storage capacitor, the NPN
The collector of type triode is connect with the cathode of the diode, one end connection of emitter and storage capacitor, collector connection
Another input terminal of the zero cross signal output module.
6. the zero-crossing detection system of alternating current according to claim 4, which is characterized in that
The zero cross signal output module includes second resistance, photoelectrical coupler and 3rd resistor；
Wherein, one end of the second resistance is connected to an output end of the detection module, the other end of the second resistance
It is connect with the anode of light emitting diode in photoelectrical coupler, the cathode of light emitting diode and the detection module in photoelectrical coupler
Another output end connection；Or in photoelectrical coupler light emitting diode anode, light emitting diode in the photoelectrical coupler
Cathode is connect with one end of the second resistance, and an output end of the other end of the second resistance and the detection module connects
It connects；
When the photoelectrical coupler exports the zero cross signal using the emitter of phototriode, the one of the 3rd resistor
End is connected to the emitter of the phototriode, the other end ground connection of the 3rd resistor；When the photoelectrical coupler uses
When the collector of phototriode exports the zero cross signal, the current collection of one end of the 3rd resistor and the phototriode
Pole connection, the other end of the 3rd resistor connect a voltage source, the emitter ground connection of phototriode.
7. the zero-crossing detection system of alternating current according to claim 2, which is characterized in that the first detection module includes
First voltage-stabiliser tube, first diode, the first storage capacitor and the first triode；
When first triode is PNP type triode, the cathode of first voltage-stabiliser tube and the anode of first diode connect
It connects, the cathode of the first diode is connect with one end of the first storage capacitor, the other end of first storage capacitor and
The anode connection of one voltage-stabiliser tube, the base stage of the PNP type triode and the anode of first diode connect, emitter and the first storage
One end connection of energy capacitor, collector connect an input terminal of the first zero cross signal output module；
When first triode is NPN type triode, the anode of first voltage-stabiliser tube connects with the cathode of first diode
It connects, the cathode of first voltage-stabiliser tube is connect with one end of the first storage capacitor, the anode of the first diode and described the
The other end of one storage capacitor connects, and the collector of the NPN type triode is connect with the cathode of the first diode, emits
Pole is connect with one end of the first storage capacitor, and collector connects another input terminal of the first zero cross signal output module.
8. the zero-crossing detection system of alternating current according to claim 2, which is characterized in that second detection module includes
Second voltage-stabiliser tube, the second diode, the second storage capacitor and the second triode；
When second triode is PNP type triode, the cathode of second voltage-stabiliser tube and the anode of the second diode connect
It connects, the cathode of second diode is connect with one end of the second storage capacitor, the other end of second storage capacitor and
The anode connection of two voltage-stabiliser tubes, the base stage of the PNP type triode are connect with the anode of the second diode, emitter and the second storage
One end connection of energy capacitor, collector connect an input terminal of the second zero cross signal output module；
When second triode is NPN type triode, the anode of second voltage-stabiliser tube connects with the cathode of the second diode
It connects, the cathode of second voltage-stabiliser tube is connect with one end of the second storage capacitor, the anode of second diode and described the
The other end of two storage capacitors connects, and the collector of the NPN type triode is connect with the cathode of second diode, emits
Pole is connect with one end of the second storage capacitor, and collector connects another input terminal of the second zero cross signal output module.
9. a kind of electronic equipment, which is characterized in that including：
The zero-crossing detection system of alternating current as described in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721896396.8U CN208109925U (en) | 2017-12-29 | 2017-12-29 | A kind of zero-crossing detection system of alternating current and electronic equipment with the system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721896396.8U CN208109925U (en) | 2017-12-29 | 2017-12-29 | A kind of zero-crossing detection system of alternating current and electronic equipment with the system |
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| CN208109925U true CN208109925U (en) | 2018-11-16 |
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