CN205883637U - LED light modulation circuit - Google Patents
LED light modulation circuit Download PDFInfo
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- CN205883637U CN205883637U CN201620699750.7U CN201620699750U CN205883637U CN 205883637 U CN205883637 U CN 205883637U CN 201620699750 U CN201620699750 U CN 201620699750U CN 205883637 U CN205883637 U CN 205883637U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model provides a LED light modulation circuit, the first switch tube of establishing ties between constant voltage output's isolation DCDC transfer circuit and LED lamp cluster is realized having avoided the complicated problem of prior art wiring to the drive and the dimming control of a plurality of parallelly connected LED lamps clusters, light modulation control circuit exports PWM signal to first switch tube according to the signal of receiving of adjusting luminance, controls the duty cycle of first switch tube, and light modulation control circuit still according to the accent signal that goes out, breaks off first switch tube, and the control load luminous flux be zero, has realized transferring the function of going out, exports the terminate signal simultaneously, control PFC circuit stop work, consumption when having reduced the circuit and realizing that the accent goes out the function.
Description
Technical field
This utility model relates to LED actuation techniques field, particularly relates to a kind of LED light adjusting circuit.
Background technology
LED illumination has the outstanding advantages such as energy-conservation, specular removal, thus is widely used in various illumination place.Shine at LED
During bright use, in the face of the different requirements of regulation LED load brightness, the driver of prior art usually LED light source is joined
A standby external dimmer device is to realize the dimming function for LED light source.
As it is shown in figure 1, arrange input line 11 and output lead 13 on LED driver 12, wherein LED driver 12 is by input
Line 11 connects power supply, is connected to LED light source by output lead 13, for LED light source output driving current.It addition, LED driver 12
On be additionally provided with and connect from the dim signal line 14 of external dimmer device, user can be regulated by external dimmer device and be input to
Dim signal in LED driver 12 so that LED driver 12 according to dim signal to output to the driving electric current of LED light source
It is adjusted, and then realizes its dimming function.
But in above-mentioned dimming mode, LED driver 12 usually current stabilization output, when connection LED lamp bead is too much, LED drives
The output voltage of device 12 is by too high；And current stabilization output causes it limited with the connected mode of LED light source, when LED light source includes many
During individual LED string, it is impossible to on-demand parallel connection LED lamp string, can only be realized for each LED string by multiple LED drivers 12
Drive respectively, simultaneously need to introduce dim signal line 14, construction wiring trouble for each independent LED driver 12.It addition, it is above-mentioned
Dimming mode is also difficult to output it electric current and is transferred to extremely low or is zero, makes the state that LED is " going out " that user observes, the most very
Difficulty realizes tune and goes out function.
Utility model content
In view of this, this utility model provides a kind of LED light adjusting circuit, to solve cannot realize in prior art LED
Lamp connection in series-parallel and wiring complexity, the problem that simultaneously cannot realize adjusting function of going out.
To achieve these goals, the technical scheme that this utility model embodiment provides is as follows:
A kind of LED light adjusting circuit, including: rectifier bridge, Active PFC pfc circuit, the first switching tube, brightness adjustment control electricity
Road and the isolation DC/DC translation circuit of constant voltage output；Wherein:
The ac input end of described rectifier bridge is connected with power supply；
The DC output end of described rectifier bridge is connected with the input of described pfc circuit；
The outfan of described pfc circuit is connected with the input of described isolation DC/DC translation circuit；
Described first switching tube is connected between the outfan of described isolation DC/DC translation circuit and load；
The input of described adjusting control circuit receives dim signal or tune goes out signal, the of described adjusting control circuit
One outfan output pwm signal, control end with described first switching tube are connected, the second outfan of described adjusting control circuit
Output termination signal, it is connected with the control end of described pfc circuit；According to described pwm signal, described dim signal adjusts described
First switching tube dutycycle the signal of the described first switching tube disconnection of signal control of going out according to described tune；Described termination signal
According to described tune go out signal control the out-of-work signal of described pfc circuit.
Preferably, described pfc circuit includes: PFC main circuit and PFC control circuit；
The input of described PFC main circuit is connected to the input of described pfc circuit；
The outfan of described PFC main circuit is connected to the outfan of described pfc circuit；
The end that controls of described PFC main circuit is connected to the outfan of described PFC control circuit；
Described termination signal is input to described PFC control circuit, when described PFC control circuit receives described termination signal
Terminate the control to PFC main circuit.
Preferably, also include: second switch pipe；
The end that controls of described second switch pipe is connected with the second outfan of described adjusting control circuit, receives described termination
Signal；
First end of described second switch pipe is connected with the control end of described PFC main circuit；
Second end ground connection of described second switch pipe.
Preferably, also include: be connected to the 3rd switching tube between described PFC main circuit and described PFC control circuit；
The end that controls of described 3rd switching tube is connected with the second outfan of described adjusting control circuit, receives described termination
Signal；
Described first end of the 3rd switching tube is connected with the outfan of described PFC control circuit；
Second end of described 3rd switching tube is connected with the control end of described PFC main circuit.
Preferably, also include: the 4th switching tube and auxiliary source circuit；
The end that controls of described 4th switching tube is connected with the second outfan of described adjusting control circuit, receives described termination
Signal；
Described first end of the 4th switching tube is connected with the feeder ear of described PFC control circuit；
Described second end of the 4th switching tube is connected with the outfan of described auxiliary source circuit.
Preferably, the power supply of the control circuit of the outfan of described auxiliary source circuit and described isolation DC/DC translation circuit
The feeder ear of end and described adjusting control circuit is connected.
Preferably, the isolating transformer of described isolation DC/DC translation circuit also includes assisting winding；Described auxiliary winding
Two ends are connected with the input of described auxiliary source circuit.
Preferably, described PFC main circuit includes: the first inductance, the first diode and the 5th switching tube；Wherein:
One end of described first inductance is connected with the DC output end positive pole of described rectifier bridge；
First end of the other end of described first inductance and described 5th switching tube and the anode phase of described first diode
Even；
Described second end of the 5th switching tube is connected with the DC output end negative pole of described rectifier bridge；
The control end that control end is described PFC main circuit of described 5th switching tube；
The negative electrode of described first diode is the output head anode of described PFC main circuit；
The negative pole of output end that second end is described PFC main circuit of described 5th switching tube.
Preferably, described isolation DC/DC translation circuit includes: flyback main circuit and flyback control circuit；Wherein:
The feeder ear of described flyback control circuit is the feeder ear of the control circuit of described isolation DC/DC translation circuit；
The outfan of described flyback control circuit is connected with the control end of described flyback main circuit；
The input of described flyback main circuit is the input of described isolation DC/DC translation circuit；
The outfan of described flyback main circuit is the outfan of described isolation DC/DC translation circuit.
Preferably, described flyback main circuit includes: isolating transformer, the second diode and the 6th switching tube；Wherein:
The Same Name of Ends of the primary side winding of described isolating transformer is connected with the output head anode of described pfc circuit；
The different name end of the primary side winding of described isolating transformer is by the output of described 6th switching tube Yu described pfc circuit
End negative pole is connected；
The control end that control end is described flyback main circuit of described 6th switching tube；
The different name end of the vice-side winding of described isolating transformer is connected with the anode of described second diode；
The negative electrode of described second diode is the output head anode of described isolation DC/DC translation circuit；
The Same Name of Ends of the vice-side winding of described isolating transformer is the negative pole of output end of described isolation DC/DC translation circuit.
The application provides a kind of LED light adjusting circuit, between isolation DC/DC translation circuit and the LED string of constant voltage output
Connect the first switching tube, it is achieved for driving and the brightness adjustment control of multiple parallel connection LED lamp strings, it is to avoid prior art wiring complexity
Problem；Adjusting control circuit is according to the dim signal received, and output pwm signal, to the first switching tube, controls described first and opens
Close the dutycycle of pipe；And described adjusting control circuit also will go out signal according to tune, output duty cycle is that the pwm signal of zero is to the most described
First switching tube, controlling load luminous flux is zero, it is achieved that adjust function of going out；And output termination signal, control pfc circuit and stop work
Make, reduce circuit realiration and adjust power consumption when going out function.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawing can be obtained according to the accompanying drawing provided.
The structural representation of a kind of LED light adjusting circuit that Fig. 1 provides for prior art；
The structural representation of a kind of LED light adjusting circuit that Fig. 2 provides for the embodiment of the present application；
The structural representation of another LED light adjusting circuit that Fig. 3 provides for another embodiment of the application；
The structural representation of another LED light adjusting circuit that Fig. 4 provides for another embodiment of the application；
The structural representation of another LED light adjusting circuit that Fig. 5 provides for another embodiment of the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
This utility model provides a kind of LED light adjusting circuit, cannot realize LED solving constant-flow driver in prior art
The on-demand parallel connection of lamp string, it is difficult to adjust go out function and the complicated problem of wiring, and this utility model can also go out merit realizing tune
During energy, it is achieved the low power consumption characteristic of circuit.
Concrete, LED light adjusting circuit, as in figure 2 it is shown, include: rectifier bridge 101, PFC (Power
FactorCorrection, PFC) circuit 102 (Active PFC pfc circuit, referred to as pfc circuit), first
Switching tube K1, adjusting control circuit 104 and the isolation DC/DC translation circuit 103 of constant voltage output；Wherein:
The ac input end of rectifier bridge 101 is connected with power supply；
The DC output end of rectifier bridge 101 is connected with the input of pfc circuit 102；
The outfan of pfc circuit 102 with and isolation DC/DC translation circuit 103 input be connected；
First switching tube K1 is connected between outfan and the load of isolation DC/DC translation circuit 103；
The input of adjusting control circuit 104 receives dim signal or tune goes out signal, the first of adjusting control circuit 104
Outfan output PWM (Pulse Width Modulation, pulse width modulation) signal and the control end of the first switching tube K1
It is connected, the second outfan output termination signal Vcoff of adjusting control circuit 104, is connected with the control end of pfc circuit 102.
Concrete operation principle is:
Rectifier bridge 101 exports to pfc circuit 102 after the alternating current that described power supply exports is converted to unidirectional current；
Pfc circuit 102 is changed by the change of the voltage after controlling its input current and followed by rectifier bridge 101, makes defeated
The phase place entering electric current is consistent with the phase place of input voltage, thus carries out PFC, to improve the PF value of circuit.
Isolation DC/DC translation circuit 103 exports for constant voltage so that it is can connect the LED string of one or more parallel connection, when
When LED light source includes multiple LED string, only can realize the LED for multiple parallel connections by a described LED light adjusting circuit
The driving of string and brightness adjustment control.As long as the electric current sum of all of LED string is less than the maximum output electricity of described LED light adjusting circuit
Flowing, the electric current being particularly well-suited to each LED string is little, and the occasion that quantity in parallel is many.
According to the described pwm signal of adjusting control circuit 104 output, described dim signal adjusts the first switching tube K1 and accounts for
Empty ratio, the signal that goes out according to described tune control the signal that the first switching tube K1 disconnects；Described dim signal is different, and the most described PWM believes
Number dutycycle change the most therewith；Described pwm signal is for controlling the first switching tube K1, by adjusting its dutycycle, it is achieved adjust
Light function；The dutycycle of the first switching tube K1 is the biggest, and the power that LED load obtains is the biggest, and luminous flux is the biggest；Otherwise, dutycycle
The least, the power that LED load obtains is the least, and luminous flux is the least.
Adjusting control circuit 104 output termination signal Vcoff according to described tune go out signal control pfc circuit 102 stop
The only signal of work.Adjusting control circuit 104 receive described tune go out signal time, the dutycycle of the described pwm signal of output is
Zero, the first switching tube K1 disconnects；That is, described tune goes out, signal is that to make the luminous flux of whole LED load be zero, LED load not work
The signal made.Meanwhile, adjusting control circuit 104 exports another control signal (termination signal Vcoff), controls pfc circuit 102
Stop power factor emendation function, reduce with this and adjust the power consumption under state of going out.
LED light adjusting circuit described in the present embodiment, is exported by the constant voltage of isolation DC/DC translation circuit 103, it is possible to achieve
The parallel connection of multiple LED load, when the LED load demand current that is particularly well-suited to often to go here and there is less, uses mode in parallel, on-demand parallel connection
LED load, improve the compatibility of drive circuit, it is to avoid the problem that prior art wiring is complicated.Meanwhile, brightness adjustment control is passed through
Circuit 104, according to the dim signal received, exports described pwm signal to the first switching tube K1；Dutycycle when described pwm signal
When being zero, the luminous flux of the load being connected with the first switching tube K1 is zero, controls to realize dimming function with PWM, it is easy to real
Now adjust function of going out.Implement tune go out function time, adjusting control circuit 104 go out signal according to the described tune received, output
Dutycycle be the pwm signal of zero to the first switching tube K1, control first switching tube K1 disconnect, and then make load (include multiple
The LED light source of LED string) luminous flux be zero, be achieved tune and go out function；And output termination signal Vcoff, control PFC electricity
Road stops PFC, reduces circuit realiration and adjusts power consumption when going out function.
In another specific embodiment of this utility model, on the basis of Fig. 2, as shown in Figure 3 or Figure 4, pfc circuit
102 include: PFC main circuit 201 and PFC control circuit 202；
The input of PFC main circuit 201 is connected to the input of pfc circuit 102；
The outfan of PFC main circuit 201 is connected to the outfan of pfc circuit 102；
The end that controls of PFC main circuit 201 is connected to the outfan of PFC control circuit 202；
Termination signal Vcoff is input to PFC control circuit 201, and PFC control circuit 202 receives termination signal Vcoff
Time, control PFC main circuit 201 and quit work.
Preferably, as it is shown on figure 3, described LED light adjusting circuit also includes: second switch pipe K2；
The end that controls of second switch pipe K2 is connected with the second outfan of adjusting control circuit 104, receives termination signal
Vcoff；
First end of second switch pipe K2 is connected with the control end of PFC main circuit 201；
The second end ground connection of second switch pipe K2.
When adjusting control circuit 104 receive described tune go out signal time, output termination signal Vcoff, control second switch
Pipe K2 closes, and control signal Vc of PFC control circuit 201 output is placed in low level all the time, and it is right that PFC control circuit 202 stops
PFC main circuit 201 is controlled, and PFC main circuit 201 loses power factor emendation function, is only passed by the voltage after rectifier bridge 101
Pass rear class isolation DC/DC translation circuit 103.
Or, as shown in Figure 4, described LED light adjusting circuit also includes: be connected to PFC main circuit 201 and PFC control circuit
The 3rd switching tube K3 between 202；
The end that controls of the 3rd switching tube K3 is connected with the second outfan of adjusting control circuit 104, receives termination signal
Vcoff；
First end of the 3rd switching tube K3 is connected with the outfan of PFC control circuit 202；
Second end of the 3rd switching tube K3 is connected with the control end of PFC main circuit 201.
When adjusting control circuit 104 receive described tune go out signal time, output termination signal Vcoff, control the 3rd switch
Pipe K3 disconnects, and the end that controls of PFC main circuit 201 disconnects the connection of the outfan with PFC control circuit 202, PFC control circuit
202 stop being controlled PFC main circuit 201, and PFC main circuit 201 loses power factor emendation function, only by rectifier bridge 101
After voltage pass to rear class isolation DC/DC translation circuit 103.
In another specific embodiment of this utility model, on the basis of Fig. 2, as it is shown in figure 5, pfc circuit 102 wraps
Include: PFC main circuit 201 and PFC control circuit 202；
The input of PFC main circuit 201 is the input of pfc circuit 102；
The outfan of PFC main circuit 201 is the outfan of pfc circuit 102；
The end that controls of PFC main circuit 201 is connected with the outfan of PFC control circuit 202；
Described termination signal Vcoff is input to described PFC control circuit, and PFC control circuit receives described termination signal
Time, cut off power supply, therefore lose the control to PFC main circuit.
Preferably, as it is shown in figure 5, described LED light adjusting circuit also includes: the 4th switching tube K4 and auxiliary source circuit；
The end that controls of the 4th switching tube K4 is connected with the second outfan of adjusting control circuit 104, receives termination signal
Vcoff；
First end of the 4th switching tube K4 is connected with the feeder ear of PFC control circuit 202；
Second end of the 4th switching tube K4 is connected with the outfan of described auxiliary source circuit；
In the supply access of described auxiliary source circuit and PFC control circuit 202, connect by controlling the 4th switching tube K4
Or turn off the connection between described auxiliary source circuit and PFC control circuit 202, realize switching on or off PFC control circuit 202
Power supply.After PFC control circuit 202 loses power supply, it is impossible to PFC main circuit 201 is controlled, PFC main circuit
201 lose power factor emendation function, and the voltage after rectifier bridge 101 only passes to rear class isolation DC/DC translation circuit 103.
Preferably, the feeder ear of the control circuit of the outfan of described auxiliary source circuit and isolation DC/DC translation circuit 103
And the feeder ear of adjusting control circuit 104 is connected, for control circuit and the adjusting control circuit of isolation DC/DC translation circuit 103
104 provide power supply.
Preferably, the isolating transformer of isolation DC/DC translation circuit 103 also includes assisting winding；
The two ends of described auxiliary winding are connected with the input of described auxiliary source circuit, provide power supply for auxiliary source circuit.
LED light adjusting circuit shown in Fig. 3 to Fig. 5, realize tune go out function time, PFC control circuit 202 quits work, on
State the two ways described in two embodiments to reduce tune and go out the power consumption under state, be not specifically limited, visually its tool herein
Body is depending on environment.
In another specific embodiment of this utility model, on the basis of Fig. 2, as arbitrary in Fig. 3 to Fig. 5 shown in, PFC master
Circuit 201 includes: the first inductance L1, the first diode D1 and the 5th switching tube K5；Wherein:
One end of first inductance L1 is connected with the DC output end positive pole of rectifier bridge 101；
The other end of the first inductance L1 and the anode of first end of the 5th switching tube K5 and the first diode D1 are connected；
Second end of the 5th switching tube K5 is connected with the DC output end negative pole of rectifier bridge 101；
5th switching tube K5 controls the control end that end is PFC main circuit 201；
The output head anode that negative electrode is PFC main circuit 201 of the first diode D1；
The negative pole of output end that second end is PFC main circuit 201 of the 5th switching tube K5.
Because circuit of reversed excitation has the characteristic of wide-range input voltage, not only normally work at prime pfc circuit, export height
During busbar voltage, can normally work；Quit work at prime pfc circuit, in the case of voltage after rectifier bridge directly inputs, also
Can normally work.
It is preferred, therefore, that, as it is shown in figure 5, described isolation DC/DC translation circuit includes: flyback main circuit 301 and flyback control
Circuit 302 processed；Wherein:
The feeder ear of flyback control circuit 302 is the feeder ear of the control circuit of isolation DC/DC translation circuit 103；
The outfan of flyback control circuit 302 is connected with the control end of flyback main circuit 201；
The input of flyback main circuit 301 is the input of isolation DC/DC translation circuit 103；
The outfan of flyback main circuit 301 is the outfan of isolation DC/DC translation circuit 103.
Preferably, as it is shown in figure 5, flyback main circuit 301 includes: isolating transformer, the second diode D2 and the 6th switch
Pipe K6；Wherein:
The Same Name of Ends of the primary side winding of described isolating transformer is connected with the output head anode of pfc circuit 102；
The different name end of the primary side winding of described isolating transformer is by the outfan of the 6th switching tube K6 with pfc circuit 102
Negative pole is connected；
6th switching tube K6 controls the control end that end is flyback main circuit 201；
The different name end of the vice-side winding of described isolating transformer and the anode of the second diode D2 are connected；
The negative electrode of the second diode D2 is the output head anode of isolation DC/DC translation circuit 103；
The Same Name of Ends of the vice-side winding of described isolating transformer is the negative pole of output end of isolation DC/DC translation circuit 103.
Preferably, the power supply of auxiliary source circuit is from an auxiliary winding of the described isolating transformer of flyback main circuit 301
Obtain.
As it is shown in figure 5, PFC main circuit 201 is boost circuit；PFC control circuit 202, adjusting control circuit 104 and anti-
Swash the power supply of control circuit 302, by the described auxiliary source circuit described isolating transformer from flyback main circuit 302
Auxiliary winding obtains.In order to close this boost circuit, cut-out auxiliary source circuit, can to the supply access of PFC control circuit 202
To turn off the 4th switching tube K4.After 4th switching tube K4 disconnects, PFC control circuit 202 loses power supply, it is impossible to PFC master
The 5th switching tube K5 in circuit 201 provides conducting voltage, the 5th switching tube K5 normal off.This Boost circuit cannot realize power
Factor correcting function, can only be directly passed to the voltage after rectifier bridge 101 instead through the first inductance L1 and the first diode D1
Swash main circuit 301.
Now, what the 4th switching tube K4 cut off is the path between described auxiliary source circuit and PFC control circuit 202,
But flyback control circuit 302 and adjusting control circuit 104 still work on, be equivalent to whole LED light adjusting circuit and be in
Holding state, the signal that once adjusting control circuit 104 receives is gone out after signal is changed into described dim signal by described tune, and
Four switching tube K4 connect, and all circuit are all started working, and described pwm signal regulates the first switching tube K1 according to described dim signal
Dutycycle, LED load is operated in the luminance state corresponding with described dutycycle.
Certainly, in concrete actual application, pfc circuit 102 implements shape with isolation DC/DC translation circuit 103
Formula is not necessarily limited to shown in Fig. 3 to Fig. 5, it is also possible to select according to concrete practical situation, can realize respective function
Circuit implementation all in the protection domain of the application.
It addition, as shown in Figures 3 to 5, it is also possible at outfan and the isolation DC/DC translation circuit of pfc circuit 102
The outfan of 103 is all connected with a filter capacitor, exports to late-class circuit after being filtered voltage again, reduces input to load
Voltage ripple.
In this utility model, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and it
The difference of his embodiment, between each embodiment, identical similar portion sees mutually.For filling disclosed in embodiment
For putting, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, relevant part sees method part
Illustrate.
Below it is only preferred implementation of the present utility model, makes to skilled artisans appreciate that or realize this practicality
Novel.Multiple amendment to these embodiments will be apparent to one skilled in the art, defined herein
General Principle can realize in other embodiments in the case of without departing from spirit or scope of the present utility model.Therefore,
This utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and new
The widest scope that grain husk feature is consistent.
Claims (10)
1. a LED light adjusting circuit, it is characterised in that including: rectifier bridge, Active PFC pfc circuit, the first switching tube,
Adjusting control circuit and the isolation DC/DC translation circuit of constant voltage output；Wherein:
The ac input end of described rectifier bridge is connected with power supply；
The DC output end of described rectifier bridge is connected with the input of described pfc circuit；
The outfan of described pfc circuit is connected with the input of described isolation DC/DC translation circuit；
Described first switching tube is connected between the outfan of described isolation DC/DC translation circuit and load；
The input of described adjusting control circuit receives dim signal or tune goes out signal, the first of described adjusting control circuit is defeated
Go out to hold output pulse width modulation (PWM) signal, control end with described first switching tube to be connected, the of described adjusting control circuit
Two outfan output termination signals, it is connected with the control end of described pfc circuit；Described dim signal according to described pwm signal
Adjust described first switching tube dutycycle the signal of the described first switching tube disconnection of signal control of going out according to described tune；Described
According to termination signal described tune go out signal control the out-of-work signal of described pfc circuit.
LED light adjusting circuit the most according to claim 1, it is characterised in that described pfc circuit includes: PFC main circuit and
PFC control circuit；
The input of described PFC main circuit is connected to the input of described pfc circuit；
The outfan of described PFC main circuit is connected to the outfan of described pfc circuit；
The end that controls of described PFC main circuit is connected to the outfan of described PFC control circuit；
Described termination signal is input to described PFC control circuit, and described PFC control circuit terminates when receiving described termination signal
Control to PFC main circuit.
LED light adjusting circuit the most according to claim 2, it is characterised in that also include: second switch pipe；
The end that controls of described second switch pipe is connected with the second outfan of described adjusting control circuit, receives described termination letter
Number；
First end of described second switch pipe is connected with the control end of described PFC main circuit；
Second end ground connection of described second switch pipe.
LED light adjusting circuit the most according to claim 2, it is characterised in that also include: be connected to described PFC main circuit with
The 3rd switching tube between described PFC control circuit；
The end that controls of described 3rd switching tube is connected with the second outfan of described adjusting control circuit, receives described termination letter
Number；
Described first end of the 3rd switching tube is connected with the outfan of described PFC control circuit；
Second end of described 3rd switching tube is connected with the control end of described PFC main circuit.
LED light adjusting circuit the most according to claim 2, it is characterised in that also include: the 4th switching tube and auxiliary source electricity
Road；
The end that controls of described 4th switching tube is connected with the second outfan of described adjusting control circuit, receives described termination letter
Number；
Described first end of the 4th switching tube is connected with the feeder ear of described PFC control circuit；
Described second end of the 4th switching tube is connected with the outfan of described auxiliary source circuit.
LED light adjusting circuit the most according to claim 5, it is characterised in that the outfan of described auxiliary source circuit is with described
The feeder ear of the control circuit of isolation DC/DC translation circuit and the feeder ear of described adjusting control circuit are connected.
7. according to the LED light adjusting circuit described in claim 5 or 6, it is characterised in that described isolation DC/DC translation circuit every
Also include from transformator assisting winding；
The two ends of described auxiliary winding are connected with the input of described auxiliary source circuit.
8. according to the arbitrary described LED light adjusting circuit of claim 2 to 6, it is characterised in that described PFC main circuit includes: first
Inductance, the first diode and the 5th switching tube；Wherein:
One end of described first inductance is connected with the DC output end positive pole of described rectifier bridge；
The other end of described first inductance is connected with the first end of described 5th switching tube and the anode of described first diode；
Described second end of the 5th switching tube is connected with the DC output end negative pole of described rectifier bridge；
The control end that control end is described PFC main circuit of described 5th switching tube；
The negative electrode of described first diode is the output head anode of described PFC main circuit；
The negative pole of output end that second end is described PFC main circuit of described 5th switching tube.
9. according to the arbitrary described LED light adjusting circuit of claim 1 to 6, it is characterised in that described isolation DC/DC translation circuit
Including: flyback main circuit and flyback control circuit；Wherein:
The feeder ear of described flyback control circuit is the feeder ear of the control circuit of described isolation DC/DC translation circuit；
The outfan of described flyback control circuit is connected with the control end of described flyback main circuit；
The input of described flyback main circuit is the input of described isolation DC/DC translation circuit；
The outfan of described flyback main circuit is the outfan of described isolation DC/DC translation circuit.
LED light adjusting circuit the most according to claim 9, it is characterised in that described flyback main circuit includes: isolation transformation
Device, the second diode and the 6th switching tube；Wherein:
The Same Name of Ends of the primary side winding of described isolating transformer is connected with the output head anode of described pfc circuit；
The different name end of the primary side winding of described isolating transformer is born by the outfan of described 6th switching tube with described pfc circuit
The most connected；
The control end that control end is described flyback main circuit of described 6th switching tube；
The different name end of the vice-side winding of described isolating transformer is connected with the anode of described second diode；
The negative electrode of described second diode is the output head anode of described isolation DC/DC translation circuit；
The Same Name of Ends of the vice-side winding of described isolating transformer is the negative pole of output end of described isolation DC/DC translation circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620699750.7U CN205883637U (en) | 2016-07-04 | 2016-07-04 | LED light modulation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620699750.7U CN205883637U (en) | 2016-07-04 | 2016-07-04 | LED light modulation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109362153A (en) * | 2018-11-09 | 2019-02-19 | 南京博德新能源技术有限公司 | A kind of LED drive power with light modulation turn-off function |
| TWI665935B (en) * | 2017-08-14 | 2019-07-11 | 國立雲林科技大學 | Active power factor correction driving system for LED light emitting element |
-
2016
- 2016-07-04 CN CN201620699750.7U patent/CN205883637U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI665935B (en) * | 2017-08-14 | 2019-07-11 | 國立雲林科技大學 | Active power factor correction driving system for LED light emitting element |
| CN109362153A (en) * | 2018-11-09 | 2019-02-19 | 南京博德新能源技术有限公司 | A kind of LED drive power with light modulation turn-off function |
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