CN108093523B - The control circuit and power supply of AC dump and light modulation shutdown - Google Patents
The control circuit and power supply of AC dump and light modulation shutdown Download PDFInfo
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- CN108093523B CN108093523B CN201711437359.5A CN201711437359A CN108093523B CN 108093523 B CN108093523 B CN 108093523B CN 201711437359 A CN201711437359 A CN 201711437359A CN 108093523 B CN108093523 B CN 108093523B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The present invention relates to the control circuit and power supply of AC dump and light modulation shutdown, including for input AC electricity first input end, the second input terminal, the AC detection circuit being connected with first input end and the second input terminal, by control terminal with AC detection circuit connected and the breaking circuit being connected on the output bus of power supply, the dimming detection circuit being connect with the control terminal of breaking circuit；AC detection circuit is for detecting alternating current, and the output exchange cut-off signals in the power-off of the alternating current of input；Dimming detection circuit detects dim signal, and the output light modulation cut-off signals when dimming shutdown；When power supply works normally, breaking circuit is connected, and the output end of control power supply disconnects after receiving exchange cut-off signals and/or dimming cut-off signals；Or the output end disconnection of power supply is controlled in the output end misconnection of power supply.The present invention solves the problems, such as that long power cut-off back loading fall time or flashing, light modulation cannot turn off and wrong causes power supply to damage.
Description
Technical field
The present invention relates to the technical fields of power supply, more specifically to the control of a kind of AC dump and light modulation shutdown
Circuit and power supply.
Background technique
The voltage decline of power output end after AC dump and light modulation shutdown, LED lamp bead, which quickly takes off, to be carried, and LED power is defeated
Output load is reduced, and the internal capacitance of LED power is slowly discharged, and added with voltage in LED lamp bead, causes part LED lamp bead complete
Fall time is extremely long or flashes, and influences client's use feeling.To this problem, after exchange input power-off more traditional way be
Output end increases false load, is equivalent to increase stand-by power consumption.And the shutdown for dim signal: current way is by one
Output voltage is pulled down to the state for being unable to lightening LED lamp pearl by the control on road.The former cannot control output voltage well, exist
The phenomenon that LED lamp bead glimmer or micro- sudden strain of a muscle；Or independent auxiliary electric power supply can also be increased, control LED power is in shutdown
State.But increase accessory power supply and then will increase cost and occupied space, reduce the reliability of power supply.
It follows that existing LED drive power has the following deficiencies:
1, the problem of the influence of fictitious load: fictitious load is equivalent to increase stand-by power consumption, is unable to satisfy global energy regulation pair
The specification requirement of no-load loss, while also will affect the transfer efficiency of power supply；
2, shut down LED lamp bead quenching problem: LED light time Outflow-Rate-Nearby-Inclined or has the phenomenon that flashing in extinguishing process, gives client
Experience sense it is bad, influence the use of client；
3, the problem of light modulation shutdown: as intelligent dimming is using more and more extensive, often being needed when light modulation is to certain darkness
It complete switching off, traditional mode is turned off capable AC input terminal using switch, and such mode is not intelligent, increase cost,
It will affect the life and reliability of power supply simultaneously.
4, input AC wrong is to the problem of output: in Practical Project installation, often will appear a certain proportion of LED electricity
The problem of input AC wrong causes power supply to damage to output end in operation in source.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, provide a kind of AC dump and
Dim the control circuit and power supply of shutdown.
The technical solution adopted by the present invention to solve the technical problems is: constructing the control of a kind of AC dump and light modulation shutdown
Circuit processed, including for input AC electricity first input end, the second input terminal, with the first input end and the second input terminal
Connected AC detection circuit is connected and is connected on the AC detection circuit on the output bus of power supply by control terminal
Breaking circuit, the dimming detection circuit being connect with the control terminal of the breaking circuit；
The AC detection circuit for detecting to alternating current, and in the power-off of the alternating current of input, close by output exchange
Break signal；
The dimming detection circuit is for detecting dim signal, and the output light modulation shutdown letter when dimming shutdown
Number；
When power supply works normally, breaking circuit conducting, and receiving exchange cut-off signals and/or described
The output end that power supply is controlled after light modulation cut-off signals disconnects；Or the output end of control power supply is disconnected in the output end misconnection of power supply
It opens.
Preferably, the AC detection circuit includes diode D1, diode D2, resistance R5, resistance R6, resistance R8, electricity
Hinder R9, first switch circuit, turning circuit, the first bleeder circuit and second switch circuit；
The turning circuit includes first end, second end, third end and the 4th end, and the first switch circuit includes the
One pin, second pin and third pin, the second switch circuit include the first control terminal, the second control terminal and third control
End；
The anode of the diode D2 is connect with the first input end, the cathode and the diode of the diode D2
The cathode of D1 connects, and the anode of the diode D1 is connect with second input terminal, the cathode of the diode D1 with it is described
The connecting node of the cathode of diode D2 is connect with the first end of the resistance R6, and the second end of the resistance R6 passes through the electricity
Hinder R8 ground connection；The second end of the first termination high level of the resistance R5, the second end of the resistance R5 and the resistance R6 connect
Connect, and the connecting node of the second end of the second end of the resistance R5 and the resistance R6 also with the first switch circuit the
The connection of one pin；
The second pin of the first switch circuit is connect with the second end of the turning circuit, the first switch circuit
Third pin ground connection；First termination high level of the turning circuit, the third end ground connection of the turning circuit, the conducting
4th end of circuit is connect with the first bleeder circuit third end, the first termination high voltage of first bleeder circuit, institute
State the first bleeder circuit second end ground connection, the third end of first bleeder circuit also with the second switch circuit first
Control terminal connection；
Second control terminal of the second switch circuit connects high voltage by the resistance R9, the second switch circuit
Third control terminal ground connection, the second control terminal of the second switch circuit are also connect with the control terminal of the breaking circuit.
Preferably, the first switch circuit includes triode Q4, and the first pin of the first switch circuit is described
The base stage of triode Q4, the second pin of the first switch circuit are the emitter of the triode Q4, the first switch
The third pin of circuit is the collector of the triode Q4.
Preferably, first bleeder circuit includes the first termination high voltage of resistance R3 and resistance R7, the resistance R3,
The second end of the resistance R3 is connect with the first end of the resistance R7, the second end ground connection of the resistance R7；
The connecting node of the first end of the second end of the resistance R3 and the resistance R7 also respectively with the turning circuit
The 4th end connected with the first control terminal of the second switch circuit；
The first end of the resistance R3 is the first end of first bleeder circuit, and the second end of the resistance R7 is described
The second end of first bleeder circuit；The connecting node of the first end of the second end of the resistance R3 and the resistance R7 is described the
The third end of one bleeder circuit.
Preferably, the second switch circuit includes triode Q3, and the first control terminal of the second switch circuit is institute
State the base stage of triode Q3, the second control terminal of the second switch circuit is the emitter of the triode Q3, described second
The third control terminal of switching circuit is the collector of the triode Q3.
Preferably, the dimming detection circuit includes third switching circuit, the second bleeder circuit, resistance R1 and diode
D3；
The first end of the third switching circuit is connect with second bleeder circuit, and the second of the third switching circuit
End is connect with the control terminal of the breaking circuit, the third end ground connection of the third switching circuit；
First termination high voltage of second bleeder circuit, the second end ground connection of second bleeder circuit, described the
The third end of two bleeder circuits is connect with the first end of the first end of the third switching circuit and the resistance R1 respectively, described
The second end of resistance R1 is connect with the anode of the diode D3, cathode and the offer dim signal of the diode D3
Light adjusting circuit connection.
Preferably, the third switching circuit includes triode Q2, and the base stage of the triode Q2 is third switch
The first end of circuit, the second end of the extremely described third switching circuit of transmitting of the triode Q2, the collection of the triode Q2
Electrode is the third end of the third switching circuit；
Second bleeder circuit includes resistance R4 and resistance R2；
The first end of the first termination high voltage of the resistance R4, the second end of the resistance R4 and the resistance R2 connect
It connects, the second end ground connection of the resistance R2, the second end of the R4 and the connecting node of the first end of the resistance R2 are also distinguished
It is connect with the first end of the base stage of the triode Q2 and the resistance R1；
The first end of the resistance R4 is the first end of second bleeder circuit, and the second end of the resistance R2 is described
The second end of second bleeder circuit, the connecting node of the first end of the second end of the resistance R4 and the resistance R2 are described the
The third end of two bleeder circuits.
It preferably, further include being connect with the first input end and the second input terminal, being defeated for rectify to alternating current
The driving circuit of driving voltage out；
The driving circuit includes the first output end and second output terminal；
First output end of the driving circuit and the positive output end of power supply connect, the second output terminal of the driving circuit
It is connect with the negative output terminal of power supply.
Preferably, the breaking circuit includes metal-oxide-semiconductor Q1, and the grid of the metal-oxide-semiconductor Q1 exchanges detection electricity with described respectively
Road is connected with the dimming detection circuit, and the drain electrode of the metal-oxide-semiconductor Q1 is connect with the negative output terminal of the power supply, the metal-oxide-semiconductor
The source electrode of Q1 is connect with the second output terminal of the driving circuit.
The present invention also provides a kind of power supplys, the control circuit including above-described AC dump and light modulation shutdown.
The control circuit for implementing AC dump and light modulation shutdown of the invention, has the advantages that friendship of the invention
The control circuit of stream power-off and light modulation shutdown can effectively solve power cut-off back loading fall time length or flashing, light modulation cannot
The problem of shutdown and the output end of input AC misconnection to power supply cause power supply to damage improves the service life, surely of power supply
Qualitative and reliability.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of the control circuit embodiment one of AC dump of the present invention and light modulation shutdown；
Fig. 2 is the structural schematic diagram of the control circuit embodiment two of AC dump of the present invention and light modulation shutdown；
Fig. 3 is the circuit diagram of the control circuit of AC dump of the present invention and light modulation shutdown.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
Refering to fig. 1, Fig. 1 is the structural schematic diagram of the control circuit embodiment one of AC dump of the present invention and light modulation shutdown.
The AC dump of the present embodiment and the control circuit of light modulation shutdown are applicable to LED power.
As shown in Figure 1, the AC dump of the present embodiment and the control circuit of light modulation shutdown include: for input AC electricity
First input end, the AC detection circuit 10 being connected with first input end and the second input terminal, passes through control terminal at the second input terminal
It is connected and is connected on the breaking circuit 30 on the output bus of power supply, the control terminal with breaking circuit 30 with AC detection circuit 10
The dimming detection circuit 20 of connection.
Wherein, AC detection circuit 10 for detecting to alternating current, and in the power-off of the alternating current of input, hand over by output
Flow cut-off signals.It, can be with it is to be appreciated that in the present embodiment, the ac input end of power supply is arranged in AC detection circuit 10
The ac input signal of power supply is measured in real time, when the exchange of power supply input power-off (i.e. when power cut-off) can be at first
Between detected, and first time export exchange cut-off signals.The output end that the exchange cut-off signals are used to control power supply is disconnected
It opens, so that the output end of power supply can be disconnected quickly, avoid having energy output again, be made connect negative in exchange input power-off
Carrying (such as LED light or LED lamp bead) can quickly extinguish, and avoiding LED light or LED lamp bead, there are still long-times to extinguish after power cut-off
Or the problem of flashing, improve user's use feeling.
Dimming detection circuit 20 is for detecting dim signal, and the output light modulation cut-off signals when dimming shutdown.
In the present embodiment, by the effect of dimming detection circuit 20, can dim signal in real-time detection circuit, and in light modulation to one
It detected at the first time when determining darkness (such as needing to turn off dim signal), and export light modulation cut-off signals in first time, lead to
The output end for crossing light modulation cut-off signals control power supply disconnects, and then makes the output end of power supply can be according to the light modulation cut-off signals certainly
Dynamic circuit breaker is opened, and the service life and reliability of power supply are improved, while also avoiding the friendship using traditional switch mode power cutoff
The problem of flowing input terminal and making increased costs.
Breaking circuit 30 is on state when power supply works normally, does not influence on the normal work of power supply.Work as shutdown
It when circuit 30 receives the exchange cut-off signals of the output of AC detection circuit 10, disconnects immediately, and then keeps the output end of power supply vertical
It disconnects, noenergy output；Or when receiving the light modulation cut-off signals of the output of dimming detection circuit 20, disconnect immediately, into
And disconnect the output end of power supply immediately, noenergy output；Or power supply output end misconnection and when accessing alternating current immediately
Disconnect, and then disconnect the output end of power supply immediately, be effectively protected power source internal device, avoid power source internal device because by
High pressure and damage.
The present invention accesses AC detection circuit 10 by the ac input end in power supply, light modulation detection is arranged in light adjusting circuit
Circuit 20 and on the output bus of power supply connect breaking circuit 30, can the exchange of power supply input power-off, light modulation shutdown or
It when person's misconnection input AC electricity, is quickly disconnected by the output end that breaking circuit 30 controls power supply, keeps the output end of power supply incompetent
Amount output efficiently solves the long ground power cut-off back loading fall time or flashing, light modulation cannot turn off and input AC is wrong
The problem of being connected to the output end of power supply causes power supply to damage improves the service life, stability and reliability of power supply, simultaneously also
Improve the transfer efficiency of power supply.
Referring to Fig.2, Fig. 2 is the structural schematic diagram of the control circuit embodiment one of AC dump of the present invention and light modulation shutdown.
As shown in Fig. 2, the present embodiment is on the basis of example 1, further can also include: with first input end and
The connection of second input terminal, the driving circuit 40 for carrying out rectification outputting drive voltage to alternating current.Wherein, driving circuit 40 wraps
Include the first output end and second output terminal；First output end of driving circuit 40 and the positive output end of power supply connect, driving circuit
40 second output terminal and the negative output terminal of power supply connect.
Specifically, as shown in Fig. 2, the driving circuit 40 of the present embodiment may include bridge rectifier, capacitor C2, transformation
Device T1 and capacitor C3.
Bridge rectifier includes first end, second end, third end and the 4th end, the first end of bridge rectifier and the
The connection of one input terminal, the second end of bridge rectifier are connect with the second input terminal, the third end of bridge rectifier and transformation
The input terminal of the armature winding of device T1 connects, and the output end of the armature winding at the 4th end and transformer T1 of bridge rectifier is total
With ground connection, capacitor C2 is connected in parallel between the input terminal and output end of the armature winding of transformer T1, the secondary windings of transformer T1
First end and the positive output end of power supply connect, the second end of the secondary windings of transformer T1 connect with breaking circuit 30.
The first end of capacitor C3 is connect with the first end of the secondary windings of transformer T1, the second end and transformer of capacitor C3
The second end of the secondary windings of T1 connects, and the connection section of the second end of the secondary windings of the second end of capacitor C3 and transformer T1
Point is additionally coupled to ground.
It should be noted that the first end of the secondary windings of the first end of capacitor C3 and transformer T1 is driving circuit
The second end of 40 the first output end, the second end of capacitor C3 and the secondary windings of transformer T1 is the second defeated of driving circuit 40
Outlet.
In the present embodiment, it is alternatively that, AC detection circuit 10 includes diode D1, diode D2, resistance R5, resistance
R6, resistance R8, resistance R9, first switch circuit 102, turning circuit 101, the first bleeder circuit 103 and second switch circuit
104。
Turning circuit 101 includes first end, second end, third end and the 4th end, and first switch circuit 102 includes first
Pin, second pin and third pin, second switch circuit 104 include the first control terminal, the second control terminal and third control terminal.
The anode of diode D2 is connect with first input end, and the cathode of diode D2 is connect with the cathode of diode D1, and two
The anode of pole pipe D1 is connect with the second input terminal, and the cathode of diode D1 is connect with the cathode of diode D2, and diode D1
Cathode is connect with the connecting node of the cathode of diode D2 with the first end of resistance R6, and the second end of resistance R6 is connect by resistance R8
Ground；The first termination high level of resistance R5, the second end of resistance R5 is connect with the second end of resistance R6, and the second end of resistance R5
It is also connect with the first pin of first switch circuit 102 with the connecting node of the second end of resistance R6.
The second pin of first switch circuit 102 is connect with the second end of turning circuit 101, first switch circuit 102
Third pin ground connection；First termination high level of turning circuit 101, the third end ground connection of turning circuit 101, turning circuit 101
The 4th end connect with 103 third end of the first bleeder circuit, the first bleeder circuit 103 first termination high voltage, first partial pressure
The second end of circuit 103 is grounded, and the third end of the first bleeder circuit 103 also connects with the first control terminal of second switch circuit 104
It connects.
Second control terminal of second switch circuit 104 connects high voltage, the third control of second switch circuit 104 by resistance R9
End ground connection processed, the second control terminal of second switch circuit 104 are also connect with the control terminal of breaking circuit 30.
Optionally, in the present embodiment, turning circuit 101 may include photoelectrical coupler OT1.It is to be appreciated that photoelectricity
The on or off of coupler OT1 is controlled by first switch circuit 102.The first end of photoelectrical coupler OT1 is turning circuit 101
First end, the second end of photoelectrical coupler OT1 is the second end of turning circuit 101, and the third end of photoelectrical coupler OT1 is to lead
The third end of circuit passband 101, the 4th end of photoelectrical coupler OT1 are the 4th end of turning circuit 101.
First switch circuit 102, for controlling the on or off of turning circuit 101.In the present embodiment, first switch
Circuit 102 may include triode Q4, and the first pin of first switch circuit 102 is the base stage of triode Q4, first switch electricity
The second pin on road 102 is the emitter of triode Q4, and the third pin of first switch circuit 102 is the current collection of triode Q4
Pole.It is to be appreciated that the on or off of triode Q4 depends primarily on the received voltage of its base stage institute, that is, depend on resistance R6
The node voltage of connecting node between resistance R8, when the node voltage of the connecting node between resistance R6 and resistance R8 reaches
When the conducting voltage of triode Q4, triode Q4 conducting, conversely, triode Q4 ends.
First bleeder circuit 103, including the first termination high voltage (VDD) of resistance R3 and resistance R7, resistance R3, resistance R3
Second end connect with the first end of resistance R7, the second end of resistance R7 ground connection；The second end of resistance R3 and the first of resistance R7
The connecting node at end is also connect with first control terminal at the 4th end of turning circuit 101 and second switch circuit 104 respectively.
The first end of resistance R3 is the first end of the first bleeder circuit 103, and the second end of resistance R7 is the first bleeder circuit
103 second end；The connecting node of the first end of the second end and resistance R7 of resistance R3 is the third of the first bleeder circuit 103
End.
It is to be appreciated that the node voltage between resistance R3 and resistance R7 is used to control the conducting of second switch circuit 104
Or shutdown, wherein the node voltage between resistance R3 and resistance R7 is the end-point voltage at the third end of the first bleeder circuit 103.
Second switch circuit 104, according to the end-point voltage on or off at the third end of the first bleeder circuit 103.Into one
Step ground, when second switch circuit 104 is connected, breaking circuit 30 receives AC dump signal, at this point, breaking circuit 30 is
It disconnects, and then disconnects the output end of power supply.
Optionally, in the present embodiment, second switch circuit 104 may include triode Q3, second switch circuit 104
First control terminal is the base stage of triode Q3, and the second control terminal of second switch circuit 104 is the emitter of triode Q3, second
The third control terminal of switching circuit 104 is the collector of triode Q3.
Dimming detection circuit 20 may include third switching circuit 201, the second bleeder circuit 202, resistance R1 and diode
D3。
The first end of third switching circuit 201 is connect with the third end of the second bleeder circuit 202, third switching circuit 201
Second end connect with the control terminal of breaking circuit 30, the third end of third switching circuit 201 ground connection.
First termination high voltage (VDD) of the second bleeder circuit 202, the second end ground connection of the second bleeder circuit 202, second
The third end of bleeder circuit 202 is connect with the first end of the first end of third switching circuit 201 and resistance R1 respectively, resistance R1's
Second end is connect with the anode of diode D3, and the cathode of diode D3 is connect with the light adjusting circuit for providing dim signal.
Third switching circuit 201 may include triode Q2, and the base stage of triode Q2 is the first of third switching circuit 201
End, the second end of the transmitting extremely third switching circuit 201 of triode Q2, the current collection of triode Q2 extremely third switching circuit
201 third end.
Second bleeder circuit 202 may include resistance R4 and resistance R2.
The first termination high voltage (VDD) of resistance R4, the second end of resistance R4 are connect with the first end of resistance R2, resistance R2
Second end ground connection, the connecting node of the first end of the second end and resistance R2 of R4 also respectively with the base stage and resistance of triode Q2
The first end of R1 connects.
The first end of resistance R4 is the first end of the second bleeder circuit 202, and the second end of resistance R2 is the second bleeder circuit
202 second end, the connecting node of the first end of the second end and resistance R2 of resistance R4 are the third of the second bleeder circuit 202
End.It is to be appreciated that the node voltage between resistance R4 and resistance R2 is the endpoint electricity at the third end of the second bleeder circuit 202
Pressure, can control the on or off of third switching circuit 201 by the end-point voltage at the third end of the second bleeder circuit 202.
Alternatively, breaking circuit 30 may include metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 respectively with AC detection circuit 10
It is connected with dimming detection circuit 20, the drain electrode of metal-oxide-semiconductor Q1 and the negative output terminal of power supply connect, the source electrode and driving electricity of metal-oxide-semiconductor Q1
The second output terminal on road 40 connects.Wherein the grid of metal-oxide-semiconductor Q1 is the control terminal of breaking circuit 30.
The present invention accesses AC detection circuit 10 by the ac input end in power supply, light modulation detection is arranged in light adjusting circuit
Circuit 20 and on the output bus of power supply connect breaking circuit 30, can the exchange of power supply input power-off, light modulation shutdown or
It when person's misconnection input AC electricity, is quickly disconnected by the output end that breaking circuit 30 controls power supply, keeps the output end of power supply incompetent
Amount output efficiently solves the long ground power cut-off back loading fall time or flashing, light modulation cannot turn off and input AC is wrong
The problem of being connected to the output end of power supply causes power supply to damage improves the service life, stability and reliability of power supply, simultaneously also
Improve the transfer efficiency of power supply.
Refering to Fig. 3, Fig. 3 is the circuit diagram of the control circuit of AC dump of the present invention and light modulation shutdown.Such as Fig. 3 institute
Show:
Driving circuit 40 includes bridge rectifier, capacitor C2, transformer T1 and capacitor C3, first input end L, second
Input terminal is N, and the positive output end of power supply is V+, the negative output terminal of power supply is V-, and AC detection circuit 10 includes diode D1, two
Pole pipe D2, resistance R5, resistance R6, resistance R8, capacitor C1, turning circuit 101, first switch circuit 102, the first bleeder circuit
103 and resistance R9, turning circuit 101 include triode Q4, the first partial pressure including photoelectrical coupler OT1, first switch circuit 102
Circuit 103 includes resistance R3 and resistance R7, and second switch circuit 104 includes triode Q3；Dimming detection circuit 20 includes third
Switching circuit 201, the second bleeder circuit 202, resistance R7 and diode D3, third switching circuit 201 include triode Q2, second
Bleeder circuit 202 includes resistance R4 and resistance R2；Breaking circuit 30 includes metal-oxide-semiconductor Q1.
As shown in figure 3, the specific connection relationship of the AC dump of the present embodiment and the control circuit of light modulation shutdown are as follows:
The first end of bridge rectifier is connect with first input end L, the second end of bridge rectifier and the second input
N connection is held, the third end of bridge rectifier connect with the input terminal of the armature winding of transformer T1, and the of bridge rectifier
Four ends and the output end of the armature winding of transformer T1 are grounded jointly, and capacitor C2 is connected in parallel on the input of the armature winding of transformer T1
Between end and output end.The first end of the secondary windings of transformer T1 and the positive output end V+ connection of power supply, time of transformer T1
The second end of grade winding is connect with the source electrode of metal-oxide-semiconductor Q1；The first end of the secondary windings of the first end and transformer T1 of capacitor C3
Connection, the second end of capacitor C3 connect and are connected to the ground with the second end of the secondary windings of transformer T1.
The anode of diode D2 is connect with first input end, and the anode of diode D1 is connect with the second input terminal, diode
The cathode of D2 connect with the cathode of diode D1 and connect with the first end of resistance R6, and the of the second end of resistance R6 and resistance R8
One end connection, the second end ground connection of resistance R8.The first termination high level (VCC) of resistance R5, the second end of resistance R5 pass through electricity
Hold C1 ground connection, and the node between resistance R5 and capacitor C1 also connect with the base stage of triode Q4, the emitter of triode Q4 and
The second end of photoelectrical coupler OT1 connects, the grounded collector of triode Q4；The first termination high level of photoelectrical coupler OT1
(VCC), the third end ground connection of photoelectrical coupler OT1, the company between the 4th end of photoelectrical coupler OT1 and resistance R3 and resistance R4
Connect node connection.The first termination high voltage (VDD) of resistance R8, the second end of resistance R8 is grounded by resistance R7, and resistance R8
Connecting node between resistance R7 is also connect with the base stage of triode Q3, and the emitter of triode Q3 connects high electricity by resistance R9
It presses (VDD), the grounded collector of triode Q3, the emitter of triode Q3 is also connect with the grid of metal-oxide-semiconductor Q1.
The emitter of triode Q2 is connect with the grid of metal-oxide-semiconductor Q1, the grounded collector of triode Q2, the base of triode Q2
Connecting node connection between pole and resistance R4 and resistance R2, the first termination high voltage (VDD) of resistance R4, the second of resistance R4
End is grounded by resistance R2, and the connecting node between resistance R4 and resistance R2 is also connect with the first end of resistance R1, resistance R1
Second end connect with the anode of diode D3, the cathode of diode D3 and the light adjusting circuit for providing dim signal are (not shown) even
It connects.
From the figure 3, it may be seen that the specific working principle is as follows for the AC dump of the present embodiment and the control circuit of light modulation shutdown:
By the alternating current of diode D1 and diode D2 real-time detection ac input end, the resistance R8 partial pressure through resistance R6
Afterwards, the on or off of triode Q4 is controlled by the node voltage between resistance R6 and resistance R8.When power supply works normally,
Triode Q4 is on state, is not influenced on the work of power supply.When the exchange of ac input end is electrically disconnected, (power supply is disconnected
Open, no alternating current input), triode Q4 conducting, and then photoelectrical coupler OT1 is connected, while triode Q3 is also switched on, this
When, when due to triode Q3 conducting, the grid of metal-oxide-semiconductor Q1 pulled down to ground, and metal-oxide-semiconductor Q1 is disconnected, and the output end of power supply disconnects, electricity
Hold the output end that the discharge current exported after the ac input end power-off of power supply cannot flow into power supply, noenergy output.
Alternatively, triode Q2 conducting, the grid of metal-oxide-semiconductor Q1 pulled down to ground when dimming shutdown, metal-oxide-semiconductor Q1 is disconnected, electricity
The output end in source disconnects, and the driving voltage that driving circuit 40 exports cannot flow into the output end of power supply, noenergy output.
Alternatively, metal-oxide-semiconductor Q1 is disconnected in the output end misconnection input AC electricity of power supply, the output end of power supply is disconnected, protected
Shield power source internal device damages due to by high pressure.
The present invention also provides a kind of power supplys, the control circuit including AC dump as described above and light modulation shutdown.It should
Power supply can be LED power, which can be disconnected in power supply by the way that the control circuit of above-mentioned AC dump and light modulation shutdown is arranged
It when electric, quickly disconnects the output end of power supply, exports power supply noenergy, and then make to connect load (such as LED light or LED lamp bead)
It avoids the problem that the fall time is too long or flashes generation；Or keep the output end of power supply automatic with dim signal when dimming shutdown
It disconnects, while power supply is in standby, noenergy output improves the transfer efficiency of power supply, reduces the power consumption of power supply；Or
Person in operation misconnection make power supply output end access alternating current when, disconnect the output end of power supply quickly, effectively protect
The internal components for protecting power supply, avoid power supply from being damaged, improve service life, the reliability and stability of power supply.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. the control circuit of a kind of AC dump and light modulation shutdown, which is characterized in that defeated including first for input AC electricity
Enter end, the second input terminal, the AC detection circuit being connected with the first input end and the second input terminal, by control terminal and institute
It states AC detection circuit and is connected and is connected on the breaking circuit on the output bus of power supply, the control terminal company with the breaking circuit
The dimming detection circuit connect；
The AC detection circuit is for detecting alternating current, and the output exchange shutdown letter in the power-off of the alternating current of input
Number；
The dimming detection circuit is for detecting dim signal, and the output light modulation cut-off signals when dimming shutdown；
When power supply works normally, the breaking circuit conducting, and receiving the exchange cut-off signals and/or the light modulation
The output end that power supply is controlled after cut-off signals disconnects；Or the output end disconnection of power supply is controlled in the output end misconnection of power supply；
AC detection circuit includes diode D1, diode D2, resistance R5, resistance R6, resistance R8, resistance R9, first switch electricity
Road, turning circuit, the first bleeder circuit and second switch circuit；
The turning circuit includes first end, second end, third end and the 4th end, and the first switch circuit draws including first
Foot, second pin and third pin, the second switch circuit include the first control terminal, the second control terminal and third control terminal；
The anode of the diode D2 is connect with the first input end, and the cathode of the diode D2 is with the diode D1's
Cathode connection, the anode of the diode D1 are connect with second input terminal, the cathode of the diode D1 and two pole
The connecting node of the cathode of pipe D2 is connect with the first end of the resistance R6, and the second end of the resistance R6 passes through the resistance R8
Ground connection；The first termination high level of the resistance R5, the second end of the resistance R5 are connect with the second end of the resistance R6, and
The second end of the resistance R5 and the connecting node of the second end of the resistance R6 are also drawn with the first of the first switch circuit
Foot connection；
The second pin of the first switch circuit is connect with the second end of the turning circuit, and the of the first switch circuit
Three pins ground connection；First termination high level of the turning circuit, the third end ground connection of the turning circuit, the turning circuit
The 4th end connect with the first bleeder circuit third end, the first termination high voltage of first bleeder circuit, described the
The second end of one bleeder circuit is grounded, and the third end of first bleeder circuit is also controlled with the first of the second switch circuit
End connection；
Second control terminal of the second switch circuit connects high voltage, the third of the second switch circuit by the resistance R9
Control terminal ground connection, the second control terminal of the second switch circuit are also connect with the control terminal of the breaking circuit.
2. the control circuit of AC dump according to claim 1 and light modulation shutdown, which is characterized in that described first opens
Powered-down road includes triode Q4, and the first pin of the first switch circuit is the base stage of the triode Q4, and described first opens
The second pin on powered-down road is the emitter of the triode Q4, and the third pin of the first switch circuit is the triode
The collector of Q4.
3. the control circuit of AC dump according to claim 1 and light modulation shutdown, which is characterized in that first partial pressure
Circuit includes the first termination high voltage of resistance R3 and resistance R7, the resistance R3, the second end of the resistance R3 and the electricity
Hinder the first end connection of R7, the second end ground connection of the resistance R7；
The connecting node of the first end of the second end of the resistance R3 and the resistance R7 also respectively with the turning circuit the
Four ends are connected with the first control terminal of the second switch circuit；
The first end of the resistance R3 is the first end of first bleeder circuit, and the second end of the resistance R7 is described first
The second end of bleeder circuit；The connecting node of the second end of the resistance R3 and the first end of the resistance R7 is described first point
The third end of volt circuit.
4. the control circuit of AC dump according to claim 1 and light modulation shutdown, which is characterized in that the second switch
Circuit includes triode Q3, and the first control terminal of the second switch circuit is the base stage of the triode Q3, and described second opens
Second control terminal on powered-down road is the emitter of the triode Q3, and the third control terminal of the second switch circuit is described three
The collector of pole pipe Q3.
5. the control circuit of AC dump according to claim 1 and light modulation shutdown, which is characterized in that the light modulation detection
Circuit includes third switching circuit, the second bleeder circuit, resistance R1 and diode D3；
The first end of the third switching circuit is connect with the third end of second bleeder circuit, the third switching circuit
Second end is connect with the control terminal of the breaking circuit, the third end ground connection of the third switching circuit；
First termination high voltage of second bleeder circuit, the second end ground connection of second bleeder circuit, described second point
The third end of volt circuit is connect with the first end of the first end of the third switching circuit and the resistance R1 respectively, the resistance
The second end of R1 is connect with the anode of the diode D3, the light modulation of the cathode and the offer dim signal of the diode D3
Circuit connection.
6. the control circuit of AC dump according to claim 5 and light modulation shutdown, which is characterized in that the third switch
Circuit includes triode Q2, and the base stage of the triode Q2 is the first end of the third switching circuit, the triode Q2's
Emit the second end of the extremely described third switching circuit, the third of the extremely described third switching circuit of the current collection of the triode Q2
End；
Second bleeder circuit includes resistance R4 and resistance R2；
The first termination high voltage of the resistance R4, the second end of the resistance R4 are connect with the first end of the resistance R2, institute
State the second end ground connection of resistance R2, the connecting node of the first end of the second end of the resistance R4 and the resistance R2 also respectively with
The base stage of the triode Q2 is connected with the first end of the resistance R1；
The first end of the resistance R4 is the first end of second bleeder circuit, and the second end of the resistance R2 is described second
The connecting node of the first end of the second end of bleeder circuit, the second end of the resistance R4 and the resistance R2 is described second point
The third end of volt circuit.
7. AC dump according to claim 1 and light modulation shutdown control circuit, which is characterized in that further include with it is described
First input end and the connection of the second input terminal, the driving circuit for carrying out rectification outputting drive voltage to alternating current；
The driving circuit includes the first output end and second output terminal；
First output end of the driving circuit and the positive output end of power supply connect, the second output terminal and electricity of the driving circuit
The negative output terminal in source connects.
8. the control circuit of AC dump according to claim 7 and light modulation shutdown, which is characterized in that the breaking circuit
Including metal-oxide-semiconductor Q1, the grid of the metal-oxide-semiconductor Q1 is connect with the AC detection circuit and the dimming detection circuit respectively, institute
The drain electrode for stating metal-oxide-semiconductor Q1 is connect with the negative output terminal of the power supply, the source electrode of the metal-oxide-semiconductor Q1 and the second of the driving circuit
Output end connection.
9. a kind of power supply, which is characterized in that the control including the described in any item AC dumps of claim 1-8 and light modulation shutdown
Circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711437359.5A CN108093523B (en) | 2017-12-26 | 2017-12-26 | The control circuit and power supply of AC dump and light modulation shutdown |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711437359.5A CN108093523B (en) | 2017-12-26 | 2017-12-26 | The control circuit and power supply of AC dump and light modulation shutdown |
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| CN108093523A CN108093523A (en) | 2018-05-29 |
| CN108093523B true CN108093523B (en) | 2019-08-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111174390A (en) * | 2020-02-17 | 2020-05-19 | 珠海格力电器股份有限公司 | Power taking circuit, wire controller, air conditioner and resistance control method |
| CN111885764B (en) * | 2020-07-15 | 2022-05-17 | 宁波公牛光电科技有限公司 | Power supply circuit and lamp |
| CN112423422A (en) * | 2020-11-27 | 2021-02-26 | 广州易而达科技股份有限公司 | Design method of light-adjusting switch and light-adjusting switch |
| CN113365391B (en) * | 2021-04-28 | 2022-08-05 | 深圳市崧盛电子股份有限公司 | Intelligent dimming turn-off control circuit and driving power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105430828B (en) * | 2014-09-22 | 2018-09-11 | 比亚迪股份有限公司 | Led drive device |
| CN204546977U (en) * | 2015-01-05 | 2015-08-12 | 苏州工业园区超群自动化设备有限公司 | A kind of controller with anti-misconnection function |
| CN104853476B (en) * | 2015-02-10 | 2017-07-18 | 深圳市佳比泰电子科技有限公司 | LED light adjusting circuits and LED lamp |
| CN206533573U (en) * | 2016-12-19 | 2017-09-29 | 深圳市崧盛电子股份有限公司 | A kind of power supply adjusting control circuit and power supply |
| CN206413223U (en) * | 2016-12-29 | 2017-08-15 | 深圳市崧盛电子股份有限公司 | A kind of single I/O interface LED adjusting control circuits |
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