CN108594082A - A kind of alternating current power-off signal transmission circuit and method - Google Patents
A kind of alternating current power-off signal transmission circuit and method Download PDFInfo
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Abstract
The present invention provides a kind of alternating current power-off signal detection circuit and method, which includes：Prime power circuit and post-stage drive circuit；Prime power circuit is provided with power-fail detection circuit and output regulating circuitry；The power-fail detection circuit is electrically connected with city, for transmitting power-off signal to the output regulating circuitry after detecting alternating current power down；Output regulating circuitry is used to change the voltage or electric current exported to post-stage drive circuit based on the power-off signal that power-fail detection circuit transmits；Post-stage drive circuit, is provided with input detecting circuit, and the input terminal of input detecting circuit is connect with the output end of output regulating circuitry in institute prime power circuit, and the variation of voltage or electric current for being exported according to output regulating circuitry is to obtain alternating current power-off signal.Detection circuit is provided based on the present invention, it can be directly by adjusting the out-put supply of power supply in power down moment, then the rear class wireline inspection voltage value judges power-down state, simplify the interface of circuit structure, unified power supply.
Description
Technical field
The present invention relates to detection circuit technical fields, more particularly to a kind of alternating current power-off signal detection circuit and method.
Background technology
With the continuous development of industrial technology, various electrical equipments are also growing day by day, and then also increase the need to power supply
It asks.System for using electric main, it is often necessary to react in the moment of alternating current power down, and then effective protection loads.
Currently, detection module of the majority circuit in alternating current power-fail detection circuit can be exported by signal wire a signal to
Rear class drives and control, but since product programming occasionally wants to the power module of prime and the drive control of rear class is made individually
Physical entity then reconnect, so, just more signal wires need to connect other than power supply output line,
The use of product may be interfered.
Invention content
The present invention provides a kind of alternating current power-off signal transmission circuit and methods to overcome the above problem or at least partly
Ground solves the above problems.
According to an aspect of the invention, there is provided a kind of alternating current power-off signal transmission circuit, which is characterized in that including：
Prime power circuit and post-stage drive circuit；
The prime power circuit, is provided with power-fail detection circuit and output regulating circuitry；The power-fail detection circuit with
City is electrically connected, for transmitting power-off signal to the output regulating circuitry after detecting alternating current power down；The output adjusts electricity
Road is used to change the voltage or electricity exported to the post-stage drive circuit based on the power-off signal that the power-fail detection circuit transmits
Stream；
The post-stage drive circuit, is provided with input detecting circuit, the input terminal of the input detecting circuit with it is described before
The output end connection of output regulating circuitry, voltage or electric current for being exported according to the output regulating circuitry in level power supply circuit
Variation to obtain alternating current power-off signal.
Optionally, the output regulating circuitry include the first transistor Q1 and with the first transistor Q1 concatenated
One resistance R1；The input detecting circuit includes operational amplifier U1；
One end of the first resistor R1 is connect with the first transistor Q1, and the other end is just defeated with the operational amplifier U1's
Enter end connection；The positive input terminal of the operational amplifier U1 also passes through second resistance R2 connection reference power supplies Vref；The operation
The negative input end of amplifier U1 is grounded by 3rd resistor R3；
When alternating current is normal, the first transistor Q1 cut-offs, the operational amplifier U1 positive input terminal voltages are equal to described
Reference power supply Vref；
When alternating current power down, the first transistor Q1 conductings, the operational amplifier U1 positive input terminal voltages reduce, and small
In the reference power supply Vref.
Optionally, the first transistor Q1 is metal-oxide-semiconductor, one end of the first resistor R1 and the first transistor Q1
Drain electrode connection；
The source electrode of the first transistor Q1 is grounded, and grid passes through the 4th resistance R4 the first supply voltages of connection VCC1.
Optionally, the power-fail detection circuit includes：The second transistor Q2 that is electrically connected with city and with it is described second brilliant
First photo-coupler U2 of body pipe Q2 connections；
The second transistor Q2 connects the light-emitting diodes in the first photo-coupler U2 primary sides in the output regulating circuitry
The voltage signal of city's electrical transmission is transmitted to the first photo-coupler U2 by the cathode of pipe D3；The first photo-coupler U2 is former
The anode of light emitting diode D3 in side passes through the 8th resistance R8 connection second source voltages VCC2；
The emitter of pair side triode Q3 connects the source electrode of the first transistor Q1, in the first photo-coupler U2
The collector of pair side triode Q3 connects the grid of the first transistor Q1 in one photo-coupler U2；
When alternating current is normal, the second transistor Q2 conductings, the first photo-coupler U2 conductings；
When alternating current power down, the second transistor Q2 cut-offs, the first photo-coupler U2 shutdowns.
Optionally, the second transistor Q2 is triode；
The collector of the second transistor Q2 connects the light emitting diode D3's in the first photo-coupler U2 primary sides
Cathode；The base stage connection alternating current of the second transistor Q2, emitter ground connection.
Optionally, the power-fail detection circuit further includes：First diode D1, the second diode D2, the 5th resistance R5,
Six resistance R6 and the 7th resistance R7；
The anode of the first diode D1 is connect with firewire L, and the anode of the second transistor D2 is connect with zero curve N；
The cathode of the first transistor D1 and second transistor D2 passes through concatenated 5th resistance R5 and the 6th resistance R6 ground connection simultaneously；
One end of the 5th resistance R5 and the 6th resistance R6 connections connects the base stage of the second transistor Q2 by the 7th resistance.
Optionally, the power-fail detection circuit further includes：First capacitance C1；
The first capacitance C1 is in parallel with the 6th resistance R6, and one end is brilliant by the 7th resistance R7 connections second
The emitter of the base stage of body pipe Q2, the other end and the second transistor Q2 is grounded simultaneously.
When alternating current is normal, the first capacitance C1 can store voltage, in city when the zero-crossing of alternating current of electricity output, to described
Second transistor Q2 provides voltage.
Optionally, the input detecting circuit further includes：9th resistance R9, the second capacitance C2 and the second photoelectrical coupler
U3；
The one end the 9th resistance R9 connects the output end of the operational amplifier U1, and the other end is connected the second capacitance C2,
The second capacitance C2 is also connect with the negative input end of the operational amplifier U1；
Wherein, the operational amplifier U1, the 9th resistance R9, the second capacitance C2 constitute Voltage Feedback ring, and the voltage is anti-
Feedback ring is used to obtain feedback reference by the mains voltage signal that the power-fail detection circuit detects, is driven with adjusting the rear class
The electric power output voltage of dynamic circuit.
Optionally, the input detecting circuit further includes：Second photo-coupler U3, the tenth resistance R10；
The cathode of light emitting diode D4 connects the output of the operational amplifier U1 in the second photo-coupler U3 primary sides
End, anode pass through the tenth resistance R10 the first supply voltages of connection VCC1；
The connection of second photo-coupler U3 pairs side controls IC, and the control IC is used for according to the operational amplifier U1 just
Input terminal voltage controls the second photo-coupler U3 primary sides, to adjust the output voltage of power supply, and drives electricity by the rear class
Road judges whether that normal driving loads according to the output voltage of power supply.
Optionally, the input detecting circuit further includes resistance R0, and one end of the resistance R0 connects the operation simultaneously
The negative input end of amplifier U1 and the second capacitance C2；
When alternating current is normal, the control IC adjustment electric power output voltage is (R0+R3) Vref/R3, post-stage drive circuit
Normal driving loads；
When alternating current power down, the control IC adjustment electric power output voltage is
(R0+R3) R1Vref/ (R1+R2) R3, post-stage drive circuit stop driving load.
According to another aspect of the present invention, a kind of alternating current power-off signal transmission method is additionally provided, including：
Alternating current power-off signal is detected by the power-fail detection circuit being arranged in prime power circuit, in the detection of power loss
After signal detection to alternating current power down, the output regulating circuitry into the prime power circuit transmits power-off signal, by described defeated
Go out to adjust circuit and changes the voltage or electric current exported to post-stage drive circuit；
The voltage or electric current that input detecting circuit in the post-stage drive circuit is exported according to the output regulating circuitry
Variation to obtain alternating current power-off signal.
Optionally, the output regulating circuitry changes the voltage or electric current exported to the post-stage drive circuit, including：
If the first transistor Q1 cut-offs in the output regulating circuitry, connect operation in the input detecting circuit and put
The first resistor R1 of the positive input terminal of big device U1 does not work；
If the first transistor Q1 conductings in the output regulating circuitry, connect the positive input of the operational amplifier U1
The first resistor R1 work at end.
Optionally, the positive input terminal of the operational amplifier U1 also passes through second resistance R2 connection reference power supplies Vref；Institute
The negative input end for stating operational amplifier U1 is grounded by 3rd resistor R3；
If the first resistor R1 for connecting the positive input terminal of operational amplifier U1 in the input detecting circuit does not work, transport
The voltage for calculating amplifier U1 positive input terminals is Vref, judges that alternating current is normal；
If connecting the first resistor R1 work of the positive input terminal of the operational amplifier U1, operational amplifier U1 positive inputs
The voltage at end is R1Vref/ (R1+R2), judges alternating current power down.
Optionally, the power-fail detection circuit being arranged in the power circuit by prime detects alternating current power-off signal, packet
It includes：
Power-fail detection circuit detects the zero curve of alternating current, the voltage of firewire by second transistor Q2, when detection of power loss electricity
When second transistor Q2 in road is connected, judge that alternating current is normal, and the normal signal of alternating current is passed through into the first photo-coupler U2 couplings
Secondary side is closed, the output regulating circuitry is transmitted to；
When the second transistor Q2 cut-off in power-fail detection circuit, alternating current power down is judged, and by the signal of alternating current power down
It is coupled to secondary side by the first photo-coupler U2, is transmitted to the output regulating circuitry.
Optionally, the power-fail detection circuit also stores voltage, the alternating current mistake of electricity output in city by the first capacitance C1
When zero, voltage is provided to the second transistor Q2.
Optionally, the voltage that the input detecting circuit in the post-stage drive circuit is exported according to the output regulating circuitry
Or after the variation of electric current is to obtain alternating current power-off signal, further include：
Change electric power output voltage based on the alternating current power-off signal, by the post-stage drive circuit according to the output of power supply
Voltage judges whether that normal driving loads.
Optionally, described that electric power output voltage is changed based on the alternating current power-off signal, including：
The input detecting circuit includes by operational amplifier U1 and surrounding 9th resistance R9, the second capacitance
The Voltage Feedback ring of C2 compositions；The second capacitance C2 passes through resistance R0 connection supply voltage output ends；
It is normal or power-off signal changes the feedback reference of the Voltage Feedback ring by the alternating current that detects, and then change electricity
Source output voltage.
Optionally, described by the way that the alternating current that detects is normal or power-off signal changes the feedback base of the Voltage Feedback ring
Standard, and then change electric power output voltage, including：
When the voltage of operational amplifier U1 positive input terminals is Vref, pass through the control of the second photo-coupler U3 pairs side connection
It is (R0+R3) Vref/R3, the load of post-stage drive circuit normal driving that IC, which adjusts electric power output voltage,；
When the voltage of operational amplifier U1 positive input terminals is R1Vref/ (R1+R2), pass through the second photo-coupler U3 pairs side
The control IC of connection adjusts electric power output voltage：
(R0+R3) R1Vref/ (R1+R2) R3, post-stage drive circuit stop driving load.
An embodiment of the present invention provides a kind of alternating current power-off signal transmission circuit and methods, by prime power circuit
Power-fail detection circuit is set to detect the power-off signal of alternating current in real time, once detect alternating current power down, it is fast by output regulating circuitry
Speed changes output to the voltage or electric current in post-stage drive circuit, and the input detecting circuit carried in post-stage drive circuit detects
Voltage or curent change will obtain alternating current power-off signal to make corresponding reaction.City based on the embodiment of the present invention
Electric power-off signal transmission circuit obviate it is traditional by independent signal line transmit alternating current power-off signal in the way of, directly using directly
It connects and transmits alternating current power-off signal by the main output of power supply, can not only simplify circuit structure, power supply can also be unified
Connect, reduce or avoid the signal interference caused by independent signal line.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, below the special specific implementation mode for lifting the present invention.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is traditional alternating current power-off signal transmission circuit structural schematic diagram；
Fig. 2 is alternating current power-off signal transmission circuit structural schematic diagram according to the ... of the embodiment of the present invention；
Fig. 3 is alternating current power-off signal transmission circuit structural schematic diagram according to the preferred embodiment of the invention；
Fig. 4 is alternating current power-off signal transmission method flow diagram according to the ... of the embodiment of the present invention.
Specific implementation mode
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.
Currently, in most electronic products, as shown in Figure 1, power output end is controlled with rear class and drive module, due to mould
Block need the moment of mains AC AC power down preserve rapidly data so as to next time be switched on when can remember current working condition,
It thus needs to integrate the one correspondingly power down of an alternating current detection of power loss unit or external addition on prime power module
Detection unit.Other than being just used for the connecting line of voltage output originally, in alternating current power down, detection of power loss circuit can also pass through
Signal wire exports a signal to rear class driving and control module, and is made rapidly to alternating current power down by rear class driving and control module
Go out reaction.In the above scheme, it is to be transmitted to power-off signal by individual signal wire, the use of product may be made
At interference.
Fig. 2 is alternating current power-off signal detection circuit structural schematic diagram according to the ... of the embodiment of the present invention, as shown in Fig. 2, this hair
The alternating current power-off signal detection circuit that bright embodiment provides may include：Prime power circuit 10 and post-stage drive circuit 20, it is preceding
Level power supply circuit 10 is provided with power-fail detection circuit 11 and output regulating circuitry 12；The alternating current of power-fail detection circuit 11 and alternating current
AC connections, for transmitting signal to output regulating circuitry 12 after detecting alternating current power down, output regulating circuitry 12 is for being based on
The power-off signal that power-fail detection circuit 11 transmits changes the voltage or electric current exported to post-stage drive circuit 20；
Post-stage drive circuit 20 is set between the output end and load of prime power circuit 10, is provided with input detection
The input terminal of circuit 21, input detecting circuit 21 is connect with the output end of output regulating circuitry 12 in prime power circuit 10, is used
In the voltage or electric current exported according to output regulating circuitry 12 variation to obtain alternating current power-off signal.
Alternating current power-off signal detection circuit provided in an embodiment of the present invention, by the way that power down is arranged in prime power circuit 10
The power-off signal that detection circuit 11 detects alternating current in real time is rapidly changed once detecting alternating current power down by output regulating circuitry 12
To the voltage or electric current in post-stage drive circuit 20, the input detecting circuit 21 carried in post-stage drive circuit detects electricity for output
Pressure or curent change will obtain alternating current power-off signal to make corresponding reaction.Based on alternating current power down provided in this embodiment
Signal deteching circuit, can be directly by adjusting the out-put supply of power supply in power down moment, and the rear class wireline inspection voltage value is right
After judge power-down state, and then save preceding level power supply and rear class driving between transmission power-off signal signal wire, Ke Yi
Auxiliary rear class circuit effectively obtains alternating current power-off signal while simplifying circuit setting, and then makes a response rapidly.
Rear rank light-adjusting module (containing MCU) composition, MCU is combined to need currently, most products are all prime constant voltage sources
Power down moment preserves current state, and next time, booting continued the state.Since prime and rear class are integral structures physically, so
Inside can have a signal wire to transmit power-off signal.But the individual signal wire may be interfered to using.Base
In scheme provided in an embodiment of the present invention, preceding level power supply can both be produced as common constant voltage source application when being applied to light modulation
When in product, the prime of light adjusting system is can also be used as, application range is more extensive.
Fig. 3 shows alternating current power-off signal detection circuit schematic diagram according to the preferred embodiment of the invention, as shown in figure 3,
Output regulating circuitry 12 may include the first transistor Q1 and with the concatenated first resistor R1 of the first transistor Q1；Input detection
Circuit 21 may include operational amplifier (abbreviation amplifier) U1；Wherein, one end of first resistor R1 is connect with the first transistor Q1,
The other end is connect with the positive input terminal of operational amplifier U1；The positive input terminal of operational amplifier U1 is also connected by second resistance R2
Reference power supply Vref；The negative input end of operational amplifier U1 is grounded by 3rd resistor R3.
When alternating current is normal, the first transistor Q1 cut-offs, operational amplifier U1 positive input terminal voltages are equal to reference power supply Vref；
When alternating current power down, the first transistor Q1 conductings, operational amplifier U1 positive input terminal voltages reduce, and are less than reference power supply Vref.
It in the present embodiment, i.e., will be defeated mainly by the acquiring size alternating current power-off signal of the input voltage of detection calculations amplifier U1
Enter voltage and be compared with the voltage inputted under normal circumstances, if it find that voltage changes, you can judges alternating current power down.It removes
Except the present embodiment introduction, the height of prime power circuit output voltage can also be judged by comparing device or other modes,
The present invention does not limit.Preferably, the first transistor Q1 can be metal-oxide-semiconductor, one end and the first transistor Q1 of first resistor R1
Drain electrode connection；The source electrode of the first transistor Q1 is grounded, and grid passes through the 4th resistance R4 the first supply voltages of connection VCC1.
With continued reference to Fig. 3, power-fail detection circuit 11 may include：The second transistor Q2 that is electrically connected with city and with second
First photo-coupler U2 of transistor Q2 connections.Wherein, the first optical coupling in second transistor Q2 connections output regulating circuitry 12
The voltage signal of city's electrical transmission is transmitted to the first photo-coupler U2 by the cathode of the light emitting diode D3 in device U2 primary sides；First
The anode of light emitting diode D3 in photo-coupler U2 primary sides passes through the 8th resistance R8 connection second source voltages VCC2.First light
Three poles when pair is secondary in the source electrode, the first photo-coupler U2 of the emitter connection the first transistor Q1 of triode Q3 in coupler U2
The grid of the collector connection the first transistor Q1 of pipe Q3；When alternating current is normal, second transistor Q2 conductings, the first photo-coupler
U2 is connected；When alternating current power down, second transistor Q2 cut-offs, the first photo-coupler U2 shutdowns.Optionally, second transistor Q2 is
Triode；The collector of second transistor Q2 connects the cathode of the light emitting diode D3 in the first photo-coupler U2 primary sides；Second
The base stage connection alternating current of transistor Q2, emitter ground connection.Power-fail detection circuit 12 predominantly detects alternating current (the i.e. alternating current of input
Whether AC) normal, under normal circumstances, Q2 can be connected, and then U2 is open-minded, and Q1 does not work；When alternating current power down, Q2 ends, and Q1 is open-minded
Work is less than reference voltage V ref so that amplifier U1 positive input terminal voltages reduce.
Power-fail detection circuit 11 can also include：First diode D1, the second diode D2, the 5th resistance R5, the 6th electricity
Hinder R6 and the 7th resistance R7；The anode of first diode D1 is connect with firewire L, and anode and the zero curve N of second transistor D2 connect
It connects；The cathode of the first transistor D1 and second transistor D2 pass through concatenated 5th resistance R5 and the 6th resistance R6 ground connection simultaneously；
One end of 5th resistance R5 and the 6th resistance R6 connections connects the base stage of second transistor Q2 by the 7th resistance.5th resistance
In R5, the 6th resistance R6 and the 7th resistance R7 circuits shown in Fig. 3, partial pressure can be played the role of.It, can be in practical application
Different number is set according to different demands and different size of resistance device, the present invention do not limit.
Optionally, power-fail detection circuit can also include：First capacitance C1；First capacitance C1 is in parallel with the 6th resistance R6,
And one end, by the base stage of the 7th resistance R7 connection second transistors Q2, the emitter of the other end and second transistor Q2 connects simultaneously
Ground.When alternating current is normal, the first capacitance C1 can store voltage, in city when the zero-crossing of alternating current of electricity output, to second transistor Q2
Voltage is provided.Since there are one zero crossings can cause second transistor Q2 conductings that may interrupt under normal circumstances for alternating current, still
Due to the presence of the first capacitance C1, the voltage that it is stored can avoid alternating current zero passage in a flash, but if alternating current power down
, second transistor Q2 very short times that can be delayed are then powered off.
Input detecting circuit 21 can also include：9th resistance R9, the second capacitance C2 and the second photoelectrical coupler U3；9th
The one end resistance R9 connects the output end of operational amplifier U1, the other end the second capacitance of series connection C2, and the second capacitance C2 is also put with operation
The negative input end connection of big device U1；Wherein, operational amplifier U1, the 9th resistance R9, the second capacitance C2 constitute Voltage Feedback ring, electricity
Pressure feedback loop is used to obtain feedback reference by the mains voltage signal that power-fail detection circuit 12 detects, to adjust rear class driving
The electric power output voltage of circuit 20.
Further, input detecting circuit 21 can also include：Second photo-coupler U3, the tenth resistance R10；Second optocoupler
Output end, the anode of light emitting diode D4 cathode connection operational amplifier U1 in clutch U3 primary sides is connected by the tenth resistance R10
Meet the first supply voltage VCC1；Triode Q4 connections in second photo-coupler U3 pairs side control IC, and control IC can be according to operation
Amplifier U1 positive input terminal voltages control the second photo-coupler U3 primary sides, to adjust the output voltage of power supply, and are driven by rear class
Circuit judges whether that normal driving loads according to the output voltage of power supply.
With continued reference to Fig. 3, input detecting circuit 21 further includes resistance R0, and one end of resistance R0 connects operational amplifier simultaneously
The negative input end of U1 and the second capacitance C2.When alternating current is normal, it is (R0+R3) Vref/ that control IC, which can adjust electric power output voltage,
R3, at this point, post-stage drive circuit normal driving loads；When alternating current power down, it is (R0+ that control IC, which can adjust electric power output voltage,
R3) R1Vref/ (R1+R2) R3 stops at this point, post-stage drive circuit stops driving load to load output current.In Fig. 3
Also show the partial circuit of power supply output, the third capacitance C3 in parallel with output end V0, the 4th capacitance C4, third diode D5
And transformer T etc..In alternating current power down, prime power circuit 10 is equivalent to unloaded output, power source internal third capacitance C3,
The energy of four capacitance C4 storages can ensure have output voltage, post-stage drive circuit 20 also just to have time enough for a long time
Store current state, uploaded state.
In the alternating current power-off signal transmission circuit that the preferred embodiment of the present invention is provided, whether detection alternating current first is normal,
And then fed back to city's electrical output signal in output regulating circuitry by optocoupler, after output regulating circuitry judges alternating current power down,
The Voltage Feedback benchmark of amplifier can be rapidly changed, and then combines the output voltage of control IC change power supplys.The embodiment of the present invention is logical
It crosses and adjusts the out-put supply of power supply in power down moment, then the rear class wireline inspection voltage value judges power-down state, thus may be used
To save independent signal wire, directly alternating current power-off signal can be transmitted by the main output of power supply, can not only be simplified
Circuit structure can also unify the interface of power supply.Above-described embodiment mainly describes after detecting alternating current power-off signal, to preceding
The voltage that level power supply output circuit is exported is adjusted, and based on similar method, can also be exported to prime power circuit
Electric current is adjusted, by the variation of comparator or other units test input currents, to obtain alternating current power-off signal, Jin Eryou
Post-stage drive circuit controls the output to load.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of alternating current power-off signal transmission method, such as Fig. 4 institutes
Show, alternating current power-off signal transmission method provided in this embodiment may include：
Step S402 detects alternating current power-off signal by the power-fail detection circuit being arranged in prime power circuit, is falling
After power detection signal detects alternating current power down, the output regulating circuitry in level power supply circuit transmits power-off signal forward, by exporting
It adjusts circuit and changes the voltage or electric current exported to post-stage drive circuit；
Step S404, the voltage or electric current that the input detecting circuit in post-stage drive circuit is exported according to output regulating circuitry
Variation to obtain alternating current power-off signal.
Alternating current power-off signal transmission method provided in an embodiment of the present invention, the power down in current level power supply circuit add slowdown monitoring circuit
After detecting alternating current power down, can the voltage or electric current that are exported to post-stage drive circuit be changed from output regulating circuitry rapidly, in turn
Alternating current power-off signal is transmitted using the change of prime power circuit output voltage or electric current, improves and is transmitted by independent signal line
Alternating current power-off signal is directly transmitted by the main output of power supply, can not only simplify circuit knot by the mode of power-off signal
Structure can also unify the interface of power supply.
Wherein, it is referred in step S402, the voltage or electricity exported to post-stage drive circuit can be changed from output regulating circuitry
Stream, it is preferable that it may include：
If the first transistor Q1 cut-offs in output regulating circuitry, connect operational amplifier U1 in input detecting circuit
The first resistor R1 of positive input terminal does not work；If the first transistor Q1 conductings in output regulating circuitry, connect operation amplifier
The first resistor R1 work of the positive input terminal of device U1.That is, transmitted whether by first there is the first transistor Q1 conductings alternating current it is normal or
Power-off signal, and then the electric first resistor R1 working conditions being connect with amplifier U1 positive input terminals are controlled, to change operational amplifier
The input voltage of the positive input terminal of U1.
Preferably, the positive input terminal of operational amplifier U1 also passes through second resistance R2 connection reference power supplies Vref；Operation is put
The negative input end of big device U1 is grounded by 3rd resistor R3；
If the first resistor R1 of the positive input terminal of operational amplifier U1 does not work in connection input detecting circuit, operation is put
The voltage of big device U1 positive input terminals is Vref, judges that alternating current is normal；If connecting the first electricity of the positive input terminal of operational amplifier U1
R1 work is hindered, then the voltage of operational amplifier U1 positive input terminals is R1Vref/ (R1+R2), judges alternating current power down.
In above-mentioned steps S402, it can also be detected by the power-fail detection circuit by being arranged in prime power circuit
Alternating current power-off signal, specifically may include：
Power-fail detection circuit detects the zero curve of alternating current, the voltage of firewire by second transistor Q2, when detection of power loss electricity
When second transistor Q2 in road is connected, judge that alternating current is normal, and the normal signal of alternating current is passed through into the first photo-coupler U2 couplings
Secondary side is closed, output regulating circuitry is transmitted to；
When the second transistor Q2 cut-off in power-fail detection circuit, alternating current power down is judged, and by the signal of alternating current power down
It is coupled to secondary side by the first photo-coupler U2, is transmitted to output regulating circuitry.
Since there are one zero crossings can cause second transistor Q2 conductings that may interrupt under normal circumstances for alternating current, in this hair
In a bright preferred embodiment, power-fail detection circuit can also store voltage by the first capacitance C1 being provided with, in alternating current
When the zero-crossing of alternating current of output, voltage is provided to second transistor Q2.
Preferably, input detecting circuit includes by operational amplifier U1 and surrounding 9th resistance R9, the second electricity
Hold the Voltage Feedback ring of C2 compositions；Second capacitance C2 passes through resistance R0 connection supply voltage output ends；It is mentioned above, it can be with base
Change electric power output voltage in alternating current power-off signal, at this point, can or power-off signal change voltage normal by the alternating current detected
The feedback reference of feedback loop, and then change electric power output voltage.Further, when the voltage of operational amplifier U1 positive input terminals is
When Vref, it is (R0+ to adjust electric power output voltage by the control IC of the triode Q4 connections in the second photo-coupler U3 pairs side
R3) Vref/R3, the load of post-stage drive circuit normal driving；When the voltage of operational amplifier U1 positive input terminals is R1Vref/ (R1+
When R2), adjusting electric power output voltage by the control IC of the triode Q4 connections in the second photo-coupler U3 pairs side is：(R0+
R3) R1Vref/ (R1+R2) R3, post-stage drive circuit stop driving load.
In embodiments of the present invention, the electricity that the input detecting circuit in post-stage drive circuit is exported according to output regulating circuitry
After the variation of pressure or electric current is to obtain alternating current power-off signal, it is also based on alternating current power-off signal and changes electric power output voltage,
Judge whether that normal driving loads according to the output voltage of power supply by post-stage drive circuit.It is rapid to stop if alternating current power down
To load output current.
Alternating current power-off signal transmission method based on the embodiment of the present invention obviates traditional utilization independent signal line
The mode of alternating current power-off signal is transmitted, directly using directly transmitting alternating current power-off signal by the main output of power supply, no
Circuit structure can only be simplified, connecing for power supply can also be unified, reduce or avoid the signal interference caused by independent signal line.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：At this
It, still can be with technical scheme described in the above embodiments is modified or right within the spirit and principle of invention
Which part or all technical features carry out equivalent replacement；And these modifications or replacements, do not make corresponding technical solution de-
From protection scope of the present invention.
Claims (18)
1. a kind of alternating current power-off signal transmission circuit, which is characterized in that including：
Prime power circuit and post-stage drive circuit；
The prime power circuit, is provided with power-fail detection circuit and output regulating circuitry；The power-fail detection circuit and alternating current
Connection, for transmitting power-off signal to the output regulating circuitry after detecting alternating current power down；The output regulating circuitry is used
Change the voltage or electric current exported to the post-stage drive circuit in the power-off signal transmitted based on the power-fail detection circuit；
The post-stage drive circuit is provided with input detecting circuit, the input terminal of the input detecting circuit and prime electricity
The output end connection of output regulating circuitry, the change of voltage or electric current for being exported according to the output regulating circuitry in source circuit
Change to obtain alternating current power-off signal.
2. alternating current power-off signal transmission circuit according to claim 1, which is characterized in that the output regulating circuitry includes
The first transistor Q1 and with the concatenated first resistor R1 of the first transistor Q1；The input detecting circuit includes that operation is put
Big device U1；
One end of the first resistor R1 is connect with the first transistor Q1, the positive input terminal of the other end and the operational amplifier U1
Connection；The positive input terminal of the operational amplifier U1 also passes through second resistance R2 connection reference power supplies Vref；The operation amplifier
The negative input end of device U1 is grounded by 3rd resistor R3；
When alternating current is normal, the first transistor Q1 cut-offs, the operational amplifier U1 positive input terminal voltages are equal to the benchmark
Power supply Vref；
When alternating current power down, the first transistor Q1 conductings, the operational amplifier U1 positive input terminal voltages reduce, and are less than institute
State reference power supply Vref.
3. alternating current power-off signal transmission circuit according to claim 2, which is characterized in that the first transistor Q1 is
Metal-oxide-semiconductor, one end of the first resistor R1 are connect with the drain electrode of the first transistor Q1；
The source electrode of the first transistor Q1 is grounded, and grid passes through the 4th resistance R4 the first supply voltages of connection VCC1.
4. alternating current power-off signal transmission circuit according to claim 3, which is characterized in that the power-fail detection circuit packet
It includes：With the second transistor Q2 of city's electrical connection and the first photo-coupler U2 being connect with the second transistor Q2；
The second transistor Q2 connects the light emitting diode D3 in the first photo-coupler U2 primary sides in the output regulating circuitry
Cathode, the voltage signal of city's electrical transmission is transmitted to the first photo-coupler U2；In the first photo-coupler U2 primary sides
Light emitting diode D3 anode pass through the 8th resistance R8 connection second source voltages VCC2；
The emitter of pair side triode Q3 connects the source electrode of the first transistor Q1, the first light in the first photo-coupler U2
The collector of pair side triode Q3 connects the grid of the first transistor Q1 in coupler U2；
When alternating current is normal, the second transistor Q2 conductings, the first photo-coupler U2 conductings；
When alternating current power down, the second transistor Q2 cut-offs, the first photo-coupler U2 shutdowns.
5. alternating current power-off signal transmission circuit according to claim 4, which is characterized in that the second transistor Q2 is three
Pole pipe；
The collector of the second transistor Q2 connects the cathode of the light emitting diode D3 in the first photo-coupler U2 primary sides；
The base stage connection alternating current of the second transistor Q2, emitter ground connection.
6. alternating current power-off signal transmission circuit according to claim 5, which is characterized in that the power-fail detection circuit also wraps
It includes：First diode D1, the second diode D2, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7；
The anode of the first diode D1 is connect with firewire L, and the anode of the second transistor D2 is connect with zero curve N；It is described
The cathode of the first transistor D1 and second transistor D2 pass through concatenated 5th resistance R5 and the 6th resistance R6 ground connection simultaneously；It is described
One end of 5th resistance R5 and the 6th resistance R6 connections connects the base stage of the second transistor Q2 by the 7th resistance.
7. alternating current power-off signal transmission circuit according to claim 6, which is characterized in that the power-fail detection circuit also wraps
It includes：First capacitance C1；
The first capacitance C1 is in parallel with the 6th resistance R6, and one end passes through the 7th resistance R7 connection second transistors
The emitter of the base stage of Q2, the other end and the second transistor Q2 is grounded simultaneously.
When alternating current is normal, the first capacitance C1 can store voltage, in city when the zero-crossing of alternating current of electricity output, to described second
Transistor Q2 provides voltage.
8. according to claim 2-6 any one of them alternating current power-off signal transmission circuits, which is characterized in that the input detection
Circuit further includes：9th resistance R9, the second capacitance C2 and the second photoelectrical coupler U3；
The one end the 9th resistance R9 connects the output end of the operational amplifier U1, the other end the second capacitance of series connection C2, described
Second capacitance C2 is also connect with the negative input end of the operational amplifier U1；
Wherein, the operational amplifier U1, the 9th resistance R9, the second capacitance C2 constitute Voltage Feedback ring, the Voltage Feedback ring
Mains voltage signal for being detected by the power-fail detection circuit obtains feedback reference, to adjust the rear class driving electricity
The electric power output voltage on road.
9. alternating current power-off signal transmission circuit according to claim 8, which is characterized in that the input detecting circuit also wraps
It includes：Second photo-coupler U3, the tenth resistance R10；
The cathode of light emitting diode D4 connects the output end, just of the operational amplifier U1 in the second photo-coupler U3 primary sides
Pole passes through the tenth resistance R10 the first supply voltages of connection VCC1；
The second photo-coupler U3 pairs side connection control IC, the control IC are for according to the operational amplifier U1 positive inputs
Terminal voltage controls the second photo-coupler U3 primary sides, to adjust the output voltage of power supply, and by the post-stage drive circuit root
Judge whether that normal driving loads according to the output voltage of power supply.
10. alternating current power-off signal transmission circuit according to claim 9, which is characterized in that the input detecting circuit is also
Including resistance R0, one end of the resistance R0 connects the negative input end and the second capacitance C2 of the operational amplifier U1 simultaneously；
When alternating current is normal, the control IC adjustment electric power output voltage is (R0+R3) Vref/R3, and post-stage drive circuit is normal
Driving load；
When alternating current power down, the control IC adjustment electric power output voltage is
(R0+R3) R1Vref/ (R1+R2) R3, post-stage drive circuit stop driving load.
11. a kind of alternating current power-off signal transmission method, including：
Alternating current power-off signal is detected by the power-fail detection circuit being arranged in prime power circuit, in the detection of power loss signal
After detecting alternating current power down, the output regulating circuitry into the prime power circuit transmits power-off signal, is adjusted by the output
Economize on electricity road changes the voltage or electric current exported to post-stage drive circuit；
The change for the voltage or electric current that input detecting circuit in the post-stage drive circuit is exported according to the output regulating circuitry
Change to obtain alternating current power-off signal.
12. according to the method for claim 11, which is characterized in that the output regulating circuitry changes to be driven to the rear class
The voltage or electric current of circuit output, including：
If the first transistor Q1 cut-offs in the output regulating circuitry, connect operational amplifier in the input detecting circuit
The first resistor R1 of the positive input terminal of U1 does not work；
If the first transistor Q1 conductings in the output regulating circuitry, connect the positive input terminal of the operational amplifier U1
First resistor R1 work.
13. according to the method for claim 12, which is characterized in that the positive input terminal of the operational amplifier U1 is also by the
Two resistance R2 connection reference power supplies Vref；The negative input end of the operational amplifier U1 is grounded by 3rd resistor R3；
If the first resistor R1 for connecting the positive input terminal of operational amplifier U1 in the input detecting circuit does not work, operation is put
The voltage of big device U1 positive input terminals is Vref, judges that alternating current is normal；
If connecting the first resistor R1 work of the positive input terminal of the operational amplifier U1, operational amplifier U1 positive input terminals
Voltage is R1Vref/ (R1+R2), judges alternating current power down.
14. according to the method for claim 13, which is characterized in that the power down inspection being arranged in the power circuit by prime
Slowdown monitoring circuit detects alternating current power-off signal, including：
Power-fail detection circuit detects the zero curve of alternating current, the voltage of firewire by second transistor Q2, when in power-fail detection circuit
Second transistor Q2 conducting when, judge that alternating current is normal, and the normal signal of alternating current is coupled to by the first photo-coupler U2
Secondary side is transmitted to the output regulating circuitry；
When the second transistor Q2 cut-offs in power-fail detection circuit, alternating current power down is judged, and the signal of alternating current power down is passed through
First photo-coupler U2 is coupled to secondary side, is transmitted to the output regulating circuitry.
15. according to the method for claim 14, which is characterized in that the power-fail detection circuit is also deposited by the first capacitance C1
In city when the zero-crossing of alternating current of electricity output, voltage is provided to the second transistor Q2 for storing up electricity pressure.
16. according to claim 12-15 any one of them methods, which is characterized in that the input in the post-stage drive circuit
After the variation for the voltage or electric current that detection circuit is exported according to the output regulating circuitry is to obtain alternating current power-off signal, also wrap
It includes：
Change electric power output voltage based on the alternating current power-off signal, by the post-stage drive circuit according to the output voltage of power supply
Judge whether that normal driving loads.
17. according to the method for claim 16, which is characterized in that described defeated based on alternating current power-off signal change power supply
Go out voltage, including：
The input detecting circuit includes by operational amplifier U1 and surrounding 9th resistance R9, the second capacitance C2 groups
At Voltage Feedback ring；The second capacitance C2 passes through resistance R0 connection supply voltage output ends；
By the way that the alternating current that detects is normal or power-off signal changes the feedback reference of the Voltage Feedback ring, and then it is defeated to change power supply
Go out voltage.
18. according to the method for claim 17, which is characterized in that described by the way that the alternating current that detects is normal or power-off signal
Change the feedback reference of the Voltage Feedback ring, and then changes electric power output voltage, including：
When the voltage of operational amplifier U1 positive input terminals is Vref, pass through the control IC tune of the second photo-coupler U3 pairs side connection
Whole electric power output voltage is (R0+R3) Vref/R3, the load of post-stage drive circuit normal driving；
When the voltage of operational amplifier U1 positive input terminals is R1Vref/ (R1+R2), connected by the second photo-coupler U3 pairs side
Control IC adjustment electric power output voltage be：
(R0+R3) R1Vref/ (R1+R2) R3, post-stage drive circuit stop driving load.
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| CN108594082B (en) | 2024-01-26 |
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