CN106841762A - Zero cross detection circuit and home appliance - Google Patents
Zero cross detection circuit and home appliance Download PDFInfo
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- CN106841762A CN106841762A CN201710068484.7A CN201710068484A CN106841762A CN 106841762 A CN106841762 A CN 106841762A CN 201710068484 A CN201710068484 A CN 201710068484A CN 106841762 A CN106841762 A CN 106841762A
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- detection circuit
- zero cross
- cross detection
- optical coupling
- diode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
Abstract
The invention provides a kind of zero cross detection circuit and home appliance, wherein, zero cross detection circuit includes：Transistor switch, is connected in series between the negative electrode interface of optical coupling module and the sampling end L of civil power live wire；Current-limiting resistance, current-limiting resistance is connected in series between the sampling end of the drive end of transistor switch and civil power zero line, wherein, when transistor switch is turned on, the first output end of optical coupling module exports zero cross signal to load control module.By technical scheme, the power consumption of zero cross detection circuit is reduced, and then improve the versatility of zero cross detection circuit.
Description
Technical field
The present invention relate to home appliance technical field, set in particular to a kind of zero cross detection circuit and a kind of household electrical appliances
It is standby.
Background technology
(civil power zero line N, civil power live wire L and civil power ground wire three-phase alternating current are generally included in home appliance incoming transport civil power
Signal) work when, it is necessary to zero cross detection circuit is set control the high power load in home appliance opening point and close point,
Particularly it is used to reduce the dash current that moment is opened in load, so as to reduce the risk of device failure and power network ripple in home appliance
It is dynamic.
In correlation technique, the connected mode of zero cross detection circuit is as shown in figure 1, specifically include current-limiting resistance R1, optocoupler mould
The devices such as block (or being photoelectrical coupler) IC, commutation diode D1, pull-up resistor R3, output protection resistance R4 and filter capacitor C
Part, wherein, current-limiting resistance R1 is used to control the operating current I of optical coupling module IC to meet 1mA≤I≤50mA.
As shown in Fig. 2 optical coupling module IC includes light emitting diode and light-sensitive device, pull-up resistor R3 and light-sensitive device are connected
Between DC source U and ground wire GND, when the electrical potential difference of the anode interface a1 and negative electrode interface a2 of optical coupling module IC is more than luminous two
During the conducting voltage of pole pipe, LEDs ON lights.
When electric main overturns, light emitting diode is not turned on lighting, because light-sensitive device is sent out in light emitting diode
Light and light two kinds in the case of, the electric signal such as partial pressure value and current value of light-sensitive device are differed, therefore, by optocoupler mould
Electric signal is passed through output protection resistance R4 and filtering by the first output end a3 and the second output end a4 of block IC
Electric capacity C is transmitted to a specified I/O interface of processor.
But, at least there is following technological deficiency in the zero cross detection circuit in correlation technique：
(1) zero cross detection circuit as shown in Figure 1 is applied in European countries, and its electric main is 230V/50Hz, zero passage
Detect that the consumption power of circuit is about 0.24 watt, no more than 0.5 watt of stand-by power consumption of screen is closed for the household electrical appliances that European Union proposes
Requirement, account for the power consumption of nearly half.
(2) CTR (Current Transfer Ratio, current transfer ratio) value of optical coupling module can be with the rising of temperature
And decay, it is therefore necessary to ensure the input electric current of optical coupling module more than or equal to 1 milliampere, therefore, it is necessary to match corresponding limit
Leakage resistance, result in zero cross detection circuit versatility poor.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art or correlation technique.
Therefore, it is an object of the present invention to propose a kind of zero cross detection circuit.
It is another object of the present invention to propose a kind of home appliance.
To achieve the above object, a kind of technical scheme according to the first aspect of the invention, it is proposed that zero cross detection circuit,
Including：Transistor switch, is connected in series between the negative electrode interface of optical coupling module and the sampling end L of civil power live wire；Current-limiting resistance,
Current-limiting resistance is connected in series between the sampling end of the drive end of transistor switch and civil power zero line, wherein, transistor switch is led
When logical, the first output end of optical coupling module exports zero cross signal to load control module.
In the technical scheme, above-mentioned zero cross detection circuit also includes optical coupling module, and the first output end of optical coupling module connects
Load control module is connected to, civil power is sampled with reference to optical coupling module and transistor switch, it is brilliant in the presence of current-limiting resistance
Body pipe switch can enter saturation state under less curent change, so that optical coupling module conducting is triggered, optical coupling module output
Zero cross signal, and then reach the purpose of zero passage detection.
It is worth it is emphasized that being connected by by the drive end of current-limiting resistance and transistor switch, transistor switch can
To obtain less electric current under different electric mains, the power consumption of zero cross detection circuit is significantly reduced, improve zero passage
Detect the versatility of circuit.
The zero cross detection circuit of above-mentioned technical proposal of the invention, can also have following technical characteristic：
In the above-mentioned technical solutions, it is preferable that when transistor switch is triode, drive end is the base stage of triode, three
The colelctor electrode of pole pipe is connected to the negative electrode interface of optical coupling module, and the emitter stage of triode is connected to ground wire.
In the technical scheme, when transistor switch is triode, the base stage using triode as drive end, and by three
The colelctor electrode of pole pipe is connected to the negative electrode interface of optical coupling module, the grounded emitter of triode.
Specifically, the conducting and cut-off of the anode interface and negative electrode interface of triode control optical coupling module, triode is led
Logical (saturation or amplification) is determined with cut-off by the positive half cycle and negative half period of simple alternating current civil power, when triode is NPN type, its
When voltage between base stage and emitter stage is more than 0.7V, very small base current can just make triode enter saturation state, from
And make optical coupling module in the conduction state.
Wherein, triode can be NPN type or positive-negative-positive according to the actual demand selection of detection zero crossing.
It is connected with the sampling end L of civil power live wire by setting the emitter stage of triode, base stage passes through the current limliting being connected in series
Resistance is connected with the sampling end of civil power zero line, for the civil power of any country, can make when the positive half cycle of civil power arrives
Triode enters saturation state, and smaller because of the base current demand of triode, generally microampere order, so current-limiting resistance
Resistance can obtain very big.
Specifically, it can be seen from horse-power formula P=U × U/R, resistance R is bigger, and power P is just smaller, it is assumed that use above-mentioned mistake
The electric equipment of zero detection circuit is used in Europe, and electric main is 230V, and the resistance for taking current-limiting resistance is 3 megaohms, then electricity
The power on road is P=230 × 230/3000000=0.0176W, and the power consumption of far smaller than existing zero cross detection circuit can meet
Stand-by power consumption requirement.
Wherein, current-limiting resistance can be that multiple is connected and/or the resistive element, or a resistance of parallel connection are larger
Resistive element.
In the above-mentioned technical solutions, it is preferable that zero cross detection circuit also includes：First diode, the sun of the first diode
Pole is connected to the emitter stage of triode, and the negative electrode of the first diode is connected to the sampling end L of civil power live wire.
In the technical scheme, the first diode is connected between the emitter stage of triode and the sampling end L of civil power live wire,
And the anode of the first diode is connected to the emitter stage of triode, negative electrode is connected to the sampling end L of above-mentioned civil power live wire, this
Sample, due to the unilateral conduction of diode, when electric main arrives in the negative half period of electric main, the first diode is in and cuts
Only state, now triode exit saturation state, optical coupling module is in cut-off state, when electric main in electric main just
When half cycle arrives, electric current can be by the first diode, and now triode enters saturation state, turns on optical coupling module, so that
The change of the level state that can be collected according to the output end of optical coupling module, judges the time of civil power zero crossing.
Wherein, the unilateral conduction of diode is the effect of the PN junction in diode, when backward voltage is larger, may be led
Cause PN junction to be damaged, i.e., when diode is in cut-off state, if electric main is beyond the breakdown reverse voltage of diode,
Diode may be caused to be reversed puncture, diode is reversed when puncturing, the electric current in circuit may be caused to sharply increase, may
Other components in destruction zero cross detection circuit.
In the above-mentioned technical solutions, it is preferable that zero cross detection circuit also includes：Second diode, the moon of the second diode
Pole is connected to the base stage of triode, and the anode of the second diode is connected to the emitter stage of triode.
In the technical scheme, by connecting the second diode between the base stage of triode and emitter stage two ends, and
The negative electrode of above-mentioned second diode is connected to the base stage of triode, and anode is connected to the emitter stage of triode, reduces triode
The possibility for puncturing is reversed, the reliability of zero cross detection circuit is improved.
In any of the above-described technical scheme, it is preferable that the resistance of current-limiting resistance is more than or equal to 3 megaohms.
In the technical scheme, because the base current demand of triode is smaller, generally microampere order, so in order to drop
The power consumption of low zero cross detection circuit is, it is necessary to current value in reducing zero cross detection circuit, so the resistance of current-limiting resistance is obtained
It is very big.
Wherein, when the resistance of current-limiting resistance is more than or equal to 3 megaohms, the computing formula according to power can draw, pin
For the electric main different to our times various countries, the power consumption of zero cross detection circuit is far smaller than in the world to home appliance
The requirement of stand-by power consumption.
Such as, when Europe uses, electric main is 230V to the electric equipment with above-mentioned zero cross detection circuit, takes current limliting
The resistance of resistance is 3 megaohms, then the power of circuit is P=230 × 230/3000000=0.0176W, far smaller than existing mistake
The power consumption of zero detection circuit, can meet stand-by power consumption requirement.Wherein, current-limiting resistance can be using multiple series connection and/or parallel connection
The mode of resistive element, it is also possible to use a resistance, concrete practice situation of the invention determines.
In the above-mentioned technical solutions, it is preferable that optical coupling module includes the light emitting diode and light-sensitive device that are oppositely arranged, light
First output end of coupling module is connected to the first end of light-sensitive device, and the second end of light-sensitive device is connected to ground wire, zero passage detection
Circuit also includes：High frequency transformation winding；3rd diode, the first of the anode connection tremendously high frequency transformation winding of the 3rd diode is defeated
Go out end, the negative electrode of the 3rd diode is connected to anode interface；Electrochemical capacitor, the positive pole of electrochemical capacitor is connected to the 3rd diode
Negative electrode, the negative pole of electrochemical capacitor is connected to the second output end of ground wire and high frequency transformation winding simultaneously, wherein, the 3rd diode
The positive pole of negative electrode and electrochemical capacitor is connected to the anode interface of optical coupling module simultaneously, for providing luminous telecommunications to light emitting diode
Number, negative electrode interface is connected to the negative electrode of light emitting diode, and anode interface is connected to the anode of light emitting diode.
In the technical scheme, optical coupling module includes the Light-Emitting Diode and light-sensitive device that are oppositely arranged, be a kind of electricity-
Electro-optic detector part, light emitting source and light-receiving device are located in same closed housing, are isolated with transparent insulator each other, conventional
Light emitting source is Light-Emitting Diode, and light-receiving device is light-sensitive device, generally photo resistance.
Light-Emitting Diode sends the light of specific wavelength in the presence of input electrical signal, is received and produced by light-sensitive device
Photoelectric current is exported, and is electrically insulated between the input and output of optical coupling module, and the transmission of electric signal has one-way, therefore, light-emitting diode
Pipe has a good buffer action to input, output electric signal, antijamming capability preferably, reduce in zero cross detection circuit because
Unstable signal caused by fluctuation interference in external disturbance or circuit.
Wherein, the voltage for being produced by multigroup high frequency transformation winding (main winding and multiple assists windings) is used as optocoupler
The voltage supplied of module, it is also possible to use one group of high frequency transformation winding, to drive Light-Emitting Diode to light.
Specifically, because the working frequency of high frequency transformation winding is higher, several class can be divided into, it is higher in switching frequency
In the case of, the ripple of output voltage is smaller, voltage smooth steady, meanwhile, because working frequency is higher, the efficiency of transmission of voltage
It is higher, the power consumption of zero detection circuit can be further reduced over.
In addition, also include the 3rd diode and electrochemical capacitor in zero cross detection circuit, for being produced to high frequency transformation winding
Voltage carry out rectification and filtering, so as to protect optical coupling module, reduce the big wink that optical coupling module is produced by high frequency transformation winding
Between circuit damage possibility, and then improve zero cross detection circuit reliability.
In the above-mentioned technical solutions, it is preferable that the second output end of optical coupling module is connected to ground wire, and zero cross detection circuit is also
Including：DC source, is connected to the first output end of optical coupling module；Pull-up resistor, is connected in series in DC source with optical coupling module
Between first output end；Output protection resistance, is connected in series between the first output end of optical coupling module and load control module；
Filter capacitor, is connected in series between load control module and ground wire.
In the technical scheme, connected with light-sensitive device by setting pull-up resistor, namely when light-sensitive device is turned on, on
Pull-up resistor plays a part of partial pressure and protection, in addition, by between first output end and load control module of optical coupling module
Output protection resistance is connected in series, the electric current up to load control module can be further reduced to, reduced the electric current and load is controlled
Molding block causes the possibility damaged.Filter capacitor can also be connected in series between load control module and ground wire, reduces electricity
The influence of voltage pulsation in road to load control module, improves the reliability of zero cross detection circuit.
In the above-mentioned technical solutions, it is preferable that the voltage range of DC source output is 3~24 volts.
In the technical scheme, DC source could be arranged to 3~24 volts of DC source, wherein, when DC source voltage is more than
, it is necessary to be isolated using triode during 5V, to reduce the possibility that bigger voltage causes to damage to zero cross detection circuit, but
Circuit power consumption can be improved, and preferably the voltage range of DC source is 3.0~5V, and it is the DC source of 3.5V generally to use DC source.
In the above-mentioned technical solutions, it is preferable that zero cross detection circuit also includes：Anodic protection resistance, is connected in series in
Between the negative electrode of three diodes and the anode interface of optical coupling module.
In the technical scheme, anode is connected in series between the negative electrode of the 3rd diode and the anode interface of optical coupling module
Protective resistance, can carry out partial pressure, so as to reduce the electricity of high frequency transformation winding generation to the voltage supplied of high frequency transformation winding transmission
Stream damages the possibility of Light-Emitting Diode, improves the reliability of zero cross detection circuit.
A kind of technical scheme according to a second aspect of the present invention, it is also proposed that home appliance, including：Such as first party of the present invention
The zero cross detection circuit proposed in any one technical scheme in face, therefore, the family of the technical scheme proposition of second aspect present invention
Electric equipment, whole beneficial effects of the zero cross detection circuit that the technical scheme with first aspect present invention is proposed, herein no longer
Repeat.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 shows the schematic diagram of the circuit structure of zero cross detection circuit in the prior art；
Fig. 2 shows the schematic diagram of the voltage waveform of zero cross detection circuit in the prior art；
Fig. 3 shows the schematic diagram of the circuit structure of the embodiment one of zero cross detection circuit of the invention；
Fig. 4 shows the schematic diagram of the circuit structure of the embodiment two of zero cross detection circuit of the invention.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied to be further described in detail the present invention.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
On the basis of the existing zero cross detection circuit shown in Fig. 1 and Fig. 2, with reference to Fig. 3 and Fig. 4 to according to the present invention
The zero cross detection circuit of embodiment be specifically described.
Embodiment one：
Fig. 3 shows the schematic diagram of the circuit structure of the embodiment one of zero cross detection circuit of the invention.
As shown in figure 3, the zero cross detection circuit of embodiments in accordance with the present invention one, including：Transistor switch Q, series connection connects
It is connected between the negative electrode interface a2 of optical coupling module IC and the sampling end L of civil power live wire；Current-limiting resistance R1, current-limiting resistance R1 series connection connect
It is connected between the drive end of transistor switch Q and the sampling end N of civil power zero line, wherein, when transistor switch Q is turned on, optocoupler mould
To load control module output zero cross signal, (I/O oral thermometers show that of load control module is general to the first output end a3 of block IC
Interface).
In the technical scheme, above-mentioned zero cross detection circuit also includes optical coupling module IC, first output of optical coupling module IC
End a3 is connected to load control module, civil power is sampled with reference to optical coupling module IC and transistor switch Q, in current-limiting resistance R1
In the presence of transistor switch Q can enter saturation state under less curent change, so as to the first of optical coupling module IC
Optical coupling module IC conductings, optical coupling module IC output zero cross signals, Jin Erda are triggered in the presence of the voltage U2 of output end a3 connections
To the purpose of zero passage detection.
It is worth it is emphasized that connected by by the drive end of current-limiting resistance R1 and transistor switch Q, transistor switch
Q can obtain less electric current under different electric mains, significantly reduce the power consumption of zero cross detection circuit, improve
The versatility of zero detection circuit.
Wherein, transistor switch Q can be positive-negative-positive structure, or NPN structures, or metal-oxide-semiconductor, but whole mistake
The control method of zero detection circuit is the same, is all according to the positive-negative half-cycle of simple alternating current civil power (including simple alternating current civil power
All-wave and half-wave mode) the transistor switch Q is operated in conducting (saturation or amplification) or cut-off state, so as to determine optocoupler mould
The on or off of block IC, and then determine the height of the output level of optical coupling module IC, it is determined whether zero crossing.Current-limiting resistance R1
Can be the resistive element, or the larger resistive element of a resistance of multiple series connection and/or parallel connection, but its purpose is all
By the demand for selecting the resistance of larger resistance to realize low-power consumption.
Further, since under electric main, the very little change of the electric current in the drive end of transistor switch Q can just make crystal
Pipe switch Q enters saturation state, therefore, it is connected in series between the drive end of transistor switch Q and the sampling end N of civil power zero line
Current-limiting resistance R1, reduces the electric current in zero cross detection circuit, and just can enter saturation state in transistor switch Q controls optocoupler
On the premise of module I C, the power of zero cross detection circuit is reduced, so as to reduce electric equipment where the circuit under holding state
Power consumption.
Further, due to the presence of current-limiting resistance R1, for the electric main of country variant, can be by zero passage detection electricity
Current limit in road makes the lower power consumption of zero cross detection circuit in range of needs, so as to improve zero passage detection electricity to very little
The versatility on road.
Embodiment two：
Fig. 4 shows the schematic diagram of the circuit structure of the embodiment two of zero cross detection circuit of the invention.
As shown in figure 4, on the basis of the zero cross detection circuit of embodiment one, it is preferable that transistor switch Q is triode
When, drive end is the base stage of triode, and the colelctor electrode of triode is connected to the negative electrode interface a2 of optical coupling module IC, the hair of triode
Emitter-base bandgap grading is connected to ground wire.
In the technical scheme, when transistor switch Q is triode, using the base stage of triode as drive end, and will
The colelctor electrode of triode is connected to the negative electrode interface a2 of optical coupling module IC, the grounded emitter of triode.
Specifically, the conducting and cut-off of the anode interface a1 and negative electrode interface a2 of triode control optical coupling module IC, three poles
The conducting (saturation or amplification) of pipe is determined with cut-off by the positive half cycle and negative half period of simple alternating current civil power, when triode is NPN
During type, when the voltage between its base stage and emitter stage is more than 0.7V, very small base current can just make triode enter saturation
State, so that optical coupling module IC is in the conduction state.
Wherein, triode can be NPN type or positive-negative-positive according to the actual demand selection of detection zero crossing.
It is connected with the sampling end L of civil power live wire by setting the emitter stage of triode, base stage passes through the current limliting being connected in series
Resistance R1 is connected with the sampling end N of civil power zero line, for the civil power of any country, can be arrived in the positive half cycle of civil power
When, triode is entered saturation state, and because the base current demand of triode is smaller, generally microampere order, so limit
The resistance of leakage resistance R1 can obtain very big.
Specifically, it can be seen from horse-power formula P=U × U/R, resistance R is bigger, and power P is just smaller, it is assumed that use above-mentioned mistake
The electric equipment of zero detection circuit is used in Europe, and electric main is 230V, and the resistance for taking current-limiting resistance R1 is 3 megaohms, then
The power of circuit is P=230 × 230/3000000=0.0176W, and the power consumption of far smaller than existing zero cross detection circuit can expire
Sufficient stand-by power consumption requirement.
Wherein, current-limiting resistance R1 can be that multiple is connected and/or the resistive element, or a resistance of parallel connection are larger
Resistive element.
In the above-mentioned technical solutions, it is preferable that zero cross detection circuit also includes：First diode D1, the first diode D1
Anode be connected to the emitter stage of triode, the negative electrode of the first diode D1 is connected to the sampling end L of civil power live wire.
In the technical scheme, the first diode is connected between the emitter stage of triode and the sampling end L of civil power live wire
D1, and the anode of the first diode D1 is connected to the emitter stage of triode, and negative electrode is connected to the sampling end of above-mentioned civil power live wire
L, so, due to the unilateral conduction of diode, when the negative half period of electric main arrives, the first diode D1 is in cut-off shape
State, now triode exit saturation state, make optical coupling module IC be in cut-off state, electric main positive half cycle arrive when,
Electric current can be by the first diode D1, and now triode enters saturation state, turns on optical coupling module IC, such that it is able to basis
The change of the level state that the output end of optical coupling module IC is collected, judges the time of civil power zero crossing.
Wherein, the unilateral conduction of diode is the effect of the PN junction in diode, when backward voltage is larger, may be led
Cause PN junction to be damaged, i.e., when diode is in cut-off state, if electric main is beyond the breakdown reverse voltage of diode,
Diode may be caused to be reversed puncture, diode is reversed when puncturing, the electric current in circuit may be caused to sharply increase, may
Other components in destruction zero cross detection circuit.
In the above-mentioned technical solutions, it is preferable that zero cross detection circuit also includes：Second diode D2, the second diode D2
Negative electrode be connected to the base stage of triode, the anode of the second diode D2 is connected to the emitter stage of triode.
In the technical scheme, by connecting the second diode D2 between the base stage of triode and emitter stage two ends, and
And the negative electrode of above-mentioned second diode D2 is connected to the base stage of triode, anode is connected to the emitter stage of triode, reduces three
Pole pipe is reversed the possibility for puncturing, and improves the reliability of zero cross detection circuit.
In any of the above-described technical scheme, it is preferable that the resistance of current-limiting resistance R1 is more than or equal to 3 megaohms.
In the technical scheme, because the base current demand of triode is smaller, generally microampere order, so in order to drop
The power consumption of low zero cross detection circuit is, it is necessary to current value in reducing zero cross detection circuit, so the resistance of current-limiting resistance R1 is taken
Obtain very big.
Wherein, when the resistance of current-limiting resistance R1 is more than or equal to 3 megaohms, the computing formula according to power can draw,
For the different electric main in our times various countries, the power consumption of zero cross detection circuit is far smaller than in the world to home appliance
Stand-by power consumption requirement.
Such as, when Europe uses, electric main is 230V to the electric equipment with above-mentioned zero cross detection circuit, takes current limliting
The resistance of resistance R1 is 3 megaohms, then the power of circuit is P=230 × 230/3000000=0.0176W, far smaller than existing
The power consumption of zero cross detection circuit, can meet stand-by power consumption requirement.Wherein, current-limiting resistance R1 can using multiple series connection and/or simultaneously
The mode of the resistive element of connection, it is also possible to use a resistance, concrete practice situation of the invention determines.
In the above-mentioned technical solutions, it is preferable that optical coupling module IC includes the LED and photosensor that are oppositely arranged
The first output end a3 of part PR, optical coupling module IC is connected to the first end of light-sensitive device PR, the second end connection of light-sensitive device PR
To ground wire GND, zero cross detection circuit also includes：High frequency transformation winding T1 (assists winding T2 can be set in addition)；3rd diode
The anode of D3, the 3rd diode D3 connects the first output end d of tremendously high frequency transformation winding, the negative electrode c connections of the 3rd diode D3
To anode interface a1；Electrochemical capacitor E, the positive pole of electrochemical capacitor E is connected to the negative electrode c of the 3rd diode D3, and electrochemical capacitor E's is negative
Pole is connected to the second output end b of ground wire and high frequency transformation winding simultaneously, wherein, the negative electrode and electrochemical capacitor of the 3rd diode D3
Positive pole be connected to the anode interface a1 of optical coupling module IC simultaneously, for providing luminous electric signal, negative electrode to LED
Interface a2 is connected to the negative electrode of LED, and anode interface a1 is connected to the anode of LED.
In the technical scheme, optical coupling module IC includes the Light-Emitting Diode LED and light-sensitive device PR that are oppositely arranged, is one
Electrical-optical-electrical switching device is planted, light emitting source and light-receiving device are located in same closed housing, are isolated with transparent insulator each other, often
Light emitting source is Light-Emitting Diode LED, and light-receiving device is light-sensitive device PR, generally photo resistance.
Light-Emitting Diode LED sends the light of specific wavelength in the presence of input electrical signal, is received by light-sensitive device PR
And produce photoelectric current to export, and being electrically insulated between the input and output of optical coupling module IC, the transmission of electric signal has one-way, therefore,
Light-Emitting Diode LED has good buffer action to input, output electric signal, and antijamming capability preferably, reduces zero passage inspection
Because caused unstable signal is disturbed in the fluctuation in external disturbance or circuit in slowdown monitoring circuit.
Wherein, multigroup voltage produced by multigroup high frequency transformation winding T1 and other setting assists winding T2 is used as optocoupler
The voltage supplied of module I C, it is also possible to use one group of high frequency transformation winding T1, to drive Light-Emitting Diode LED to light.
Specifically, because the working frequency of high frequency transformation winding T1 is higher, several class can be divided into, switching frequency compared with
In the case of height, the ripple of output voltage is smaller, voltage smooth steady, meanwhile, because working frequency is higher, the transmission effect of voltage
Rate is higher, can further reduce over the power consumption of zero detection circuit.
In addition, also include the 3rd diode D3 and electrochemical capacitor E in zero cross detection circuit, for high frequency transformation winding T1
The voltage of generation carries out rectification and filtering, so as to protect optical coupling module IC, reduces optical coupling module IC and is produced by high frequency transformation winding T1
The possibility that raw big immediate current is damaged, and then improve the reliability of zero cross detection circuit.
In the above-mentioned technical solutions, it is preferable that the second output end a4 of optical coupling module IC is connected to ground wire GND, zero passage inspection
Slowdown monitoring circuit also includes：DC source U1, is connected to the first output end a3 of optical coupling module IC；Pull-up resistor R3, is connected in series in straight
Between the first output end a3 of stream source U1 and optical coupling module IC；Output protection resistance R4, is connected in series in the of optical coupling module IC
Between one output end a3 and load control module；Filter capacitor C, is connected in series between load control module and ground wire GND.
In the technical scheme, connected with light-sensitive device PR by setting pull-up resistor R3, namely led in light-sensitive device PR
When logical, pull-up resistor R3 plays a part of partial pressure and protection, in addition, by the first output end a3 of optical coupling module IC and load
Output protection resistance R4 is connected in series between control module, the electric current up to load control module can be further reduced to, reduced
The possibility that the electric current causes to damage to load control module.Can also between load control module and ground wire GND the company of series connection
Filter capacitor C is met, reduces influence of the voltage pulsation in circuit to load control module, improve the reliability of zero cross detection circuit
Property.
In the above-mentioned technical solutions, it is preferable that the voltage range of DC source U1 outputs is 3~24 volts.
In the technical scheme, DC source U1 could be arranged to 3~24 volts of DC source, wherein, when DC source U1 voltages
, it is necessary to be isolated using triode during more than 5V, to reduce the possibility that bigger voltage causes to damage to zero cross detection circuit
Property, but circuit power consumption can improve, and the preferably voltage range of DC source is 3.0~5V, and it is the direct current of 3.5V generally to use DC source
Source U1.
In the above-mentioned technical solutions, it is preferable that zero cross detection circuit also includes：Anodic protection resistance R2, is connected in series in
Between the negative electrode of the 3rd diode D3 and the anode interface a1 of optical coupling module IC.
In the technical scheme, the company of series connection between the negative electrode of the 3rd diode D3 and the anode interface a1 of optical coupling module IC
Meet anodic protection resistance R2, can to high frequency transformation winding T1 transmission voltage supplied carry out partial pressure so that reduce high frequency transformation around
The possibility of the circuit damage Light-Emitting Diode LED that group T1 is produced, improves the reliability of zero cross detection circuit.
Wherein, home appliance includes but is not limited to refrigerator, washing machine, electric cooker, electromagnetic oven and television set.
Be worth it is emphasized that the zero cross detection circuit in the technical program be by discrete element erect come,
Belong to analogue signal circuit, therefore, the anti-leaky wave interference performance of the circuit is stronger.Wherein, leaky wave interference refers to microwave equipment
During microwave operational, because microwave encounters the specular characteristic of metal, can typically produce 0.1 at circuit control panel installing
To the leaky wave interference signal of 3 milliwatts or so, can be acted directly on the component body of circuit control panel by space radiation, it is right
Comparator etc. causes large effect than more sensitive device, makes its operation irregularity.
Embodiments of the invention are described in detail above in association with accompanying drawing, it is contemplated that the existing zero passage proposed in correlation technique
Detection circuit power consumption is higher and technical problem of circuit poor universality, and the present invention proposes a kind of zero passage detection scheme, by will
The drive end series connection of current-limiting resistance and transistor switch, transistor switch can obtain less electricity under different electric mains
Stream, significantly reduces the power consumption of zero cross detection circuit, improves the versatility of zero cross detection circuit.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of zero cross detection circuit, the zero cross detection circuit includes optical coupling module, the first output end of the optical coupling module
It is connected to load control module, it is characterised in that the zero cross detection circuit also includes：
Transistor switch, is connected in series between the negative electrode interface of the optical coupling module and the sampling end of civil power live wire；
Current-limiting resistance, the current-limiting resistance be connected in series in the transistor switch drive end and civil power zero line sampling end it
Between,
Wherein, when the transistor switch is turned on, the first output end of the optical coupling module is exported to the load control module
Zero cross signal.
2. zero cross detection circuit according to claim 1, it is characterised in that
When the transistor switch is triode, the drive end is the base stage of the triode, the colelctor electrode of the triode
The anode interface of the optical coupling module is connected to, the emitter stage of the triode is connected to ground wire.
3. zero cross detection circuit according to claim 2, it is characterised in that also include：
First diode, the anode of first diode is connected to the emitter stage of the triode, first diode
Negative electrode is connected to the sampling end of the civil power live wire.
4. zero cross detection circuit according to claim 2, it is characterised in that also include：
Second diode, the anode of second diode is connected to the base stage of the triode, the moon of second diode
Pole is connected to the emitter stage of the triode.
5. zero cross detection circuit according to any one of claim 1 to 4, it is characterised in that
The resistance of the current-limiting resistance is more than or equal to 3 megaohms.
6. zero cross detection circuit according to claim 5, it is characterised in that
The optical coupling module includes the light emitting diode and light-sensitive device that are oppositely arranged, and the first output end of the optical coupling module connects
The first end of the light-sensitive device is connected to, the second end of the light-sensitive device is connected to ground wire, and the zero cross detection circuit is also wrapped
Include：
High frequency transformation winds；
3rd diode, the anode of the 3rd diode is connected to the first output end of the high frequency transformation winding, and described the
The negative electrode of three diodes is connected to the anode interface；
Electrochemical capacitor, the positive pole of the electrochemical capacitor is connected to the anode of the 3rd diode, the negative pole of the electrochemical capacitor
The second output end of ground wire and high frequency transformation winding is connected to simultaneously,
Wherein, the positive pole of the anode of the 3rd diode and the electrochemical capacitor is connected to the anode of the optical coupling module simultaneously
Interface, for providing luminous electric signal to the light emitting diode, the negative electrode interface is connected to the moon of the light emitting diode
Pole, the anode interface is connected to the anode of the light emitting diode.
7. zero cross detection circuit according to claim 6, it is characterised in that the second output end connection of the optical coupling module
To ground wire, the zero cross detection circuit also includes：
DC source, is connected to the first output end of the optical coupling module；
Pull-up resistor, is connected in series between the DC source and the first output end of the optical coupling module；
Output protection resistance, is connected in series between the first output end of the optical coupling module and the load control module；
Filter capacitor, is connected in series between the load control module and ground wire.
8. zero cross detection circuit according to claim 7, it is characterised in that
The voltage range of the DC source output is 3~24 volts.
9. the zero cross detection circuit according to any one of claim 6 to 8, it is characterised in that also include：
Anodic protection resistance, is connected in series between the anode of the 3rd diode and the anode interface of the optical coupling module.
10. a kind of home appliance, it is characterised in that including：
Zero cross detection circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068484.7A CN106841762A (en) | 2017-02-08 | 2017-02-08 | Zero cross detection circuit and home appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068484.7A CN106841762A (en) | 2017-02-08 | 2017-02-08 | Zero cross detection circuit and home appliance |
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|---|---|
| CN106841762A true CN106841762A (en) | 2017-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710068484.7A Pending CN106841762A (en) | 2017-02-08 | 2017-02-08 | Zero cross detection circuit and home appliance |
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| CN107844071A (en) * | 2017-08-30 | 2018-03-27 | 松下家电研究开发（杭州）有限公司 | Control method, zero standby power switch and household electrical appliance |
| CN110380663A (en) * | 2019-07-12 | 2019-10-25 | 郑宏峰 | The method for carrying out length control using ac adjustable speed motor feedback winding |
| CN110448168A (en) * | 2019-08-29 | 2019-11-15 | 九阳股份有限公司 | A kind of method for heating and controlling of boiling water pot |
| CN110579639A (en) * | 2019-10-08 | 2019-12-17 | 苏州博创集成电路设计有限公司 | Commercial power zero-crossing detection circuit and switching power supply system using same |
| CN111781417A (en) * | 2020-07-17 | 2020-10-16 | 四川长虹空调有限公司 | Zero-crossing detection circuit and method |
| CN112462131A (en) * | 2020-11-05 | 2021-03-09 | 无锡芯朋微电子股份有限公司 | Commercial power zero-crossing detection circuit and non-isolated power supply system applying same |
| CN113054965A (en) * | 2021-03-11 | 2021-06-29 | 重庆大学 | Detection circuit for closed and suspended states of high-low level effective switch of vehicle |
| CN114113759A (en) * | 2021-12-22 | 2022-03-01 | 杭州联芯通半导体有限公司 | Zero-crossing detection circuit |
| CN114966187A (en) * | 2022-07-27 | 2022-08-30 | 华录易云科技有限公司 | Commercial power voltage monitoring circuit and method and application in traffic signal machine |
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| CN110448168A (en) * | 2019-08-29 | 2019-11-15 | 九阳股份有限公司 | A kind of method for heating and controlling of boiling water pot |
| CN110448168B (en) * | 2019-08-29 | 2021-09-10 | 九阳股份有限公司 | Heating control method of water boiler |
| CN110579639A (en) * | 2019-10-08 | 2019-12-17 | 苏州博创集成电路设计有限公司 | Commercial power zero-crossing detection circuit and switching power supply system using same |
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| CN112462131A (en) * | 2020-11-05 | 2021-03-09 | 无锡芯朋微电子股份有限公司 | Commercial power zero-crossing detection circuit and non-isolated power supply system applying same |
| CN112462131B (en) * | 2020-11-05 | 2024-04-02 | 无锡芯朋微电子股份有限公司 | Mains supply zero-crossing detection circuit and non-isolated power supply system using same |
| CN113054965A (en) * | 2021-03-11 | 2021-06-29 | 重庆大学 | Detection circuit for closed and suspended states of high-low level effective switch of vehicle |
| CN114113759A (en) * | 2021-12-22 | 2022-03-01 | 杭州联芯通半导体有限公司 | Zero-crossing detection circuit |
| CN114966187A (en) * | 2022-07-27 | 2022-08-30 | 华录易云科技有限公司 | Commercial power voltage monitoring circuit and method and application in traffic signal machine |
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Application publication date: 20170613 |