CN108770124A - A kind of LED drive circuit and lighting apparatus - Google Patents
A kind of LED drive circuit and lighting apparatus Download PDFInfo
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- CN108770124A CN108770124A CN201810644245.6A CN201810644245A CN108770124A CN 108770124 A CN108770124 A CN 108770124A CN 201810644245 A CN201810644245 A CN 201810644245A CN 108770124 A CN108770124 A CN 108770124A
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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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- 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 invention discloses a kind of LED drive circuit and lighting apparatus, including control circuit and resonance circuit, control circuit includes feedback regulating circuit, is switched off control circuit and switching circuit.Wherein, feedback regulating circuit detects the output parameter of resonance circuit and obtains detection parameters first, and given basic parameter and detection parameters is made poor, then adjusts deviation through proportional integration to obtain feedback voltage.Switch off control circuit when detecting that the voltage of resonant capacitance rises to feedback voltage, the switching tube shutdown being attached thereto is controlled, to adjust the drive signal of switching tube up and down, so as to adjust the working frequency of resonance circuit to stablize output parameter.Under the control model of the application, switching circuit only need to can be arranged control circuit according to the output voltage of resonance circuit and be operated in fast ring or slow ring, to simplify switching foundation；And even if LED matrix has dimming function, without dim signal is considered, to which the circuit for making control switch loop circuit state becomes simple accurate.
Description
Technical field
The present invention relates to lighting technical fields, more particularly to a kind of LED drive circuit and lighting apparatus.
Background technology
Currently, since LED (Light Emitting Diode, light emitting diode) has high light efficiency, long lifespan and without dirt
The advantages that dye, is widely used in lighting area.In the prior art, for driving the LED drive circuit of LED operation to include：Packet
The resonance circuit of Cr containing the resonant capacitance and upper switch pipe Q1 of alternate conduction and lower switch pipe Q2 (please refers to Fig. 1, Fig. 1 is existing
A kind of topological diagram of resonance circuit in technology) and control resonance circuit control circuit.
For the wider circuit occasion of working range, for stabilization control circuit, inner loop is usually arranged in control circuit
Road is two kinds of working conditions：Fast loop state (fast ring) and at a slow speed loop circuit state (slow ring).Generally, control circuit is selected voltage-controlled
Type controls chip, and in the resonance circuit of voltage-controlled type control, the switching foundation of loop circuit state is the output power of resonance circuit, when
When output power is relatively low, fast ring is switched to, when output power is higher, switches to slow ring.As it can be seen that for voltage-controlled type control circuit,
The switching of loop circuit state causes switching according to more complicated according to consider output voltage and output current simultaneously；If LED also has
There are dimming function, dim signal also to consider that in switching according within, the circuit so as to cause control switching loop circuit state becomes
Complexity, and switching is more according to the variable considered, can not more coordinate the relationship between variable, be cut so as to cause determining
It changes a little inaccurate.
Therefore, how to provide it is a kind of solve above-mentioned technical problem scheme be that those skilled in the art needs to solve at present
The problem of.
Invention content
The object of the present invention is to provide a kind of LED drive circuit and lighting apparatus, switching circuit only need to be according to resonance circuit
Output voltage control circuit can be set be operated in fast ring or slow ring, to simplify switching foundation；Due to switching electricity
The switching foundation on road is only related to the output voltage of resonance circuit, even if LED matrix has dimming function, is dimmed without consideration
Signal, to which the circuit for making control switch loop circuit state becomes simple accurate.
In order to solve the above technical problems, the present invention provides a kind of LED drive circuit, including control circuit and include resonance
The resonance circuit of capacitance and the upper switch pipe of alternate conduction with lower switch pipe, for driving Light-emitting diode LED device luminous,
In, the control circuit includes：
Feedback regulating circuit, the output parameter for detecting the resonance circuit, and default will give basic parameter and obtain
It is poor that the detection parameters that arrive are made, and deviation adjusted through proportional integration to obtain feedback voltage；
Input terminal switches off control circuit with what the output end of the feedback regulating circuit was connect, for working as the resonant capacitance
Voltage when rising to the feedback voltage, control any selected switching tube shutdown in the resonance circuit, and accordingly adjust
The drive signal of another switching tube；
Test side is connect with the output end of the resonance circuit, control terminal is connect with the switch terminal of the feedback regulating circuit
Switching circuit, for when the output voltage of the resonance circuit of detection is not less than predeterminated voltage, controlling feedback tune
Economize on electricity road switches to fast ring, to accelerate its response speed, conversely, switching to slow ring.
Preferably, the output parameter of the resonance circuit of detection is specially output current.
Preferably, the output end of the resonance circuit includes output plus terminal and output negative terminal；The feedback regulating circuit packet
Sampling resistor, input resistance, operational amplifier and loop circuit are included, wherein：
The first end of the sampling resistor is connect with the output negative terminal of the resonance circuit, and common end grounding is described to adopt
The second end of sample resistance is connect with the first end of the input negative terminal of the LED matrix and the input resistance respectively, the input
The second end of resistance is connect with the first end of the input negative terminal of the operational amplifier and the loop circuit respectively, the operation
The input positive terminal of amplifier inputs the given basic parameter, and the of the output end of the operational amplifier and the loop circuit
Two ends connect, output end of the common end as the feedback regulating circuit, and the switch terminal of the loop circuit is as described anti-
Feedback adjusts the switch terminal of circuit；
Then the switching circuit is specifically used for when the output voltage of the resonance circuit of detection is not less than predeterminated voltage,
Increase the equivalent resistance of the loop circuit or reduce the equivalent capacitance value of the loop circuit, to control the feedback regulation
Circuit switches to fast ring, conversely, switching to slow ring.
Preferably, the loop circuit includes first switch pipe, first resistor, second resistance, 3rd resistor and the first electricity
Hold, wherein：
The first end of the first switch pipe respectively with the first end of the second resistance and the 3rd resistor first
End connection, first end of the common end as the loop circuit, the second end of the 3rd resistor and first capacitance
First end connects, and the second end of the first switch pipe connect with the first end of the first resistor, and the of the first resistor
Two ends are connect with the second end of the second end of the second resistance and first capacitance respectively, and common end is as the loop
The second end of circuit, the switch terminal of the control terminal of the first switch pipe as the loop circuit.
Preferably, the loop circuit includes second switch pipe, the 4th resistance, the 5th resistance and the second capacitance, wherein：
The first end of second switch pipe is connect with the first end of the 5th resistance, common end as loop circuit first
End, the second end of second switch pipe connect with the first end of the 4th resistance, the second end of the 4th resistance respectively with the 5th resistance
Second end and the connection of the first end of the second capacitance, the second end of the second end of the second capacitance as loop circuit, second switch pipe
Switch terminal of the control terminal as loop circuit.
Preferably, it is described switch off control circuit including：
The comparison circuit for the input terminal that input terminal switches off control circuit as described in is used for the electricity of the resonant capacitance
Pressure and the feedback voltage generate cut-off signals when the voltage of the resonant capacitance rises to the feedback voltage；
Driving circuit for when detecting the cut-off signals, controlling selected switching tube shutdown, and is accordingly adjusted
The drive signal of whole another switching tube.
Preferably, the comparison circuit is specially first comparator, and one of described first comparator input terminal is made
For the input terminal of the comparison circuit, another input terminal of the first comparator input the resonant capacitance voltage or its
Sampled value, the output end of the first comparator are connect with the input terminal of the driving circuit.
Preferably, the switching circuit includes：
Detection comparison circuit of the test side as the test side of the switching circuit, for detecting the defeated of the resonance circuit
Go out voltage, and compare the output voltage and predeterminated voltage of detection, when the output voltage of detection is not less than the predeterminated voltage
When, output end generates fast ring switching signal, conversely, generating slow ring switching signal；
Switch driving circuit of the end as the control terminal of the switching circuit is driven, detects that the fast ring cutting changes for working as
When signal or the slow ring switching signal, feedback regulating circuit switches to fast ring or slow ring described in respective drive, accordingly to add
It is fast or slow down its response speed.
Preferably, the test side of the detection comparison circuit includes the first test side and the second test side, the resonance electricity
The output end on road includes output plus terminal and output negative terminal, the first test side and the resonance circuit of the detection comparison circuit
Output plus terminal connects, and the second test side of the detection comparison circuit is connect with the output negative terminal of the resonance circuit, public
End ground connection；The detection comparison circuit includes the first divider resistance, the second divider resistance and the second comparator, wherein：
First test side of the first end of first divider resistance as the detection comparison circuit, first partial pressure
The second end of resistance connects with one of the first end of second divider resistance and second comparator input terminal respectively
It connects, the second test side of the second end of second divider resistance as the detection comparison circuit, second comparator
Another input terminal inputs the predeterminated voltage, and the output end of second comparator is as the output for detecting comparison circuit
End.
In order to solve the above technical problems, the present invention also provides a kind of lighting apparatus, including LED matrix, further include above-mentioned
Any LED drive circuit.
The present invention provides a kind of LED drive circuit, the LED drive circuit in the application includes control circuit and resonance electricity
Road, compared with voltage-controlled type control circuit in the prior art, the control circuit in the application includes feedback regulating circuit, shutdown control
Circuit processed and switching circuit.Wherein, feedback regulating circuit detects the output parameter of resonance circuit and obtains detection parameters first, and will
It is poor that given basic parameter is made with detection parameters, then adjusts deviation through proportional integration to obtain feedback voltage, feedback electricity here
Pressure represents the two departure degree.Then, switch off control circuit when detecting that the voltage of resonant capacitance rises to feedback voltage, control
The switching tube shutdown being attached thereto, to adjust the drive signal of upper switch pipe and lower switch pipe, so as to adjust the work of resonance circuit
Working frequency, and the size of the output parameter by working frequency control resonance circuit, make output parameter move closer to given benchmark
Parameter, to stablize output parameter.
Under the control model of the application, the stability of control circuit depends no longer on the output power of resonance circuit, only
Related to the output voltage of resonance circuit, specifically, switching circuit detects that the output voltage of resonance circuit is not less than set electricity
When pressure, control feedback regulating circuit switches to fast ring, to accelerate the response speed of feedback regulating circuit, conversely, switching to slow ring.
As it can be seen that only control circuit, which need to can be arranged, according to the output voltage of resonance circuit in switching circuit is operated in fast ring or slow ring,
To simplify switching foundation；Since the switching foundation of switching circuit is only related to the output voltage of resonance circuit, even if LED is filled
It sets with dimming function, without dim signal is considered, to which the circuit for making control switch loop circuit state becomes simple accurate.
The present invention also provides a kind of lighting apparatus, with above-mentioned LED drive circuit advantageous effect having the same.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of topological diagram of resonance circuit in the prior art；
Fig. 2 is a kind of structural schematic diagram of LED drive circuit provided by the invention；
Fig. 3 is the structural schematic diagram of another LED drive circuit provided by the invention；
Fig. 4 (a) is the structural schematic diagram of the first loop circuit provided by the invention；
Fig. 4 (b) is the structural schematic diagram of second of loop circuit provided by the invention；
Fig. 4 (c) is the structural schematic diagram of the third loop circuit provided by the invention.
Specific implementation mode
Core of the invention is to provide a kind of LED drive circuit and lighting apparatus, switching circuit only need to be according to resonance circuits
Output voltage control circuit can be set be operated in fast ring or slow ring, to simplify switching foundation；Due to switching electricity
The switching foundation on road is only related to the output voltage of resonance circuit, even if LED matrix has dimming function, is dimmed without consideration
Signal, to which the circuit for making control switch loop circuit state becomes simple accurate.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 2 is please referred to, Fig. 2 is the structural schematic diagram of the first LED drive circuit provided by the invention.
The LED drive circuit, including control circuit 1 and upper switch pipe and lower switch comprising resonant capacitance and alternate conduction
Pipe, the resonance circuit 2 for driving Light-emitting diode LED device luminous, wherein control circuit 1 includes：
Feedback regulating circuit 21, the output parameter for detecting resonance circuit 2, and give basic parameter by default and obtain
Detection parameters make poor, and deviation adjusted through proportional integration to obtain feedback voltage；
What input terminal was connect with the output end of feedback regulating circuit 21 switch off control circuit 22, for the electricity when resonant capacitance
When pressure rises to feedback voltage, any selected switching tube shutdown in resonance circuit 2 is controlled, and accordingly adjust another switching tube
Drive signal；
Test side connect with the output end of resonance circuit 2, the switch terminal connection of control terminal and feedback regulating circuit 21 is cut
Circuit 23 is changed, for when the output voltage of the resonance circuit 2 of detection is not less than predeterminated voltage, control feedback regulating circuit 21 to be cut
Fast ring is shifted to, to accelerate its response speed, conversely, switching to slow ring.
It should be noted that default in the application sets in advance, it is only necessary to which setting is primary, unless according to reality
Situation needs to change, and otherwise need not reset.
Specifically, the LED drive circuit in the application includes control circuit 1 and resonance circuit 2, resonance circuit 2 here
Can be ternary part resonance circuit, as LLC resonance circuits (Fig. 1, Lm represent the magnetizing inductance of transformer, and Lr represents resonant inductance,
Cr represents resonant capacitance) and LCC resonance circuits, or four element resonance circuits or other multicomponent resonance circuits, this Shen
It is not particularly limited herein please.But a few element resonance circuits no matter are selected, a condition will be followed：In resonance circuit
Including resonant capacitance.
In addition, include the upper switch pipe and lower switch pipe of alternate conduction in resonance circuit 2, and for drive upper switch pipe and
The duty ratio of the drive signal of lower switch pipe conducting is 50%, so the on/off moment of known one of switching tube,
It can speculate the on/off moment of another switching tube.
Control circuit 1 is for controlling resonance circuit 2 in the application comprising feedback regulating circuit 21 switches off control circuit
22 and switching circuit 23, wherein feedback regulating circuit 21 and 22 outputs for collectively constituting control resonance circuit 2 that switch off control circuit
The circuit of parameter stability, switching circuit 23 are used to control the loop circuit state of feedback regulating circuit 21, that is, control feedback regulating circuit
21 response speeds changed for output parameter.
More specifically, the output parameter for the resonance circuit 2 that the application stablizes can be output current, or output electricity
Pressure, can play the role of stable resonant oscillation circuit 2.For the output parameter that the application stablizes, the application is arranged one in advance
Given basic parameter, that is, stable resonant oscillation circuit 2 the value that reaches of output parameter.Then control the output parameter of resonance circuit 2
Stablize to the process of given basic parameter and includes：
First, feedback regulating circuit 21 detects the output parameter of resonance circuit 2, obtains detection parameters, and by given benchmark
It is poor that parameter and obtained detection parameters are made, and obtains the deviation of the two, and deviation is adjusted through proportional integration to obtain feedback voltage, institute
Deviate the degree for giving basic parameter, when the two departure degree increases, feedback voltage with feedback voltage reflection detection parameters
Value also increases.
Secondly, the application consider resonance circuit 2 in up and down switching tube work alternatively, it includes resonant capacitance voltage
Also it is in the mechanical periodicity of rising and downward trend, so the on/off moment of the switching tube up and down of resonance circuit 2 and resonance electricity
There is certain correspondence between the voltage of appearance；The application is additionally contemplates that opening/closing for the switching tube up and down for changing resonance circuit 2
The disconnected moment can change the working frequency of resonance circuit 2, and then change the output parameter of resonance circuit 2, so switching off control circuit
The voltage (Vcs represents the voltage of resonant capacitance in Fig. 2) of 22 detection resonant capacitances, when the voltage of resonant capacitance rises to feedback electricity
When pressure, any selected switching tube in resonance circuit 2 (upper switch pipe or lower switch pipe, based on selected switching tube is are controlled
Switching tube) shutdown, to accordingly adjust the drive signal of another switching tube, to adjust the working frequency of resonance circuit 2, and then tune
The output parameter of whole resonance circuit 2 makes output parameter move closer to given basic parameter, to stablize output parameter.Further,
The application selectes lower switch pipe as main switch.
As it can be seen that different from existing voltage-controlled type control circuit, the control circuit 1 of the application uses new control model, i.e.,
By detecting the voltage of resonant capacitance, turned off to control main switch in resonance circuit 2.This control model is different from voltage-controlled
The control model of type, the control model of voltage-controlled type adjust the frequency of resonance circuit by directly controlling the working frequency of switching tube
Rate, and the control model of the application has selected the shutdown moment of control switching tube, the working frequency for being indirectly controlled switching tube is come
Influence the frequency of resonance circuit 2 (frequency of resonance circuit 2 is directly related to the output power of resonance circuit 2).The application this
Planting the inherent characteristics of control model is：The stability of circuit is only related to the output voltage of resonance circuit 2, and eliminates the reliance on resonance
The output power of circuit 2 makes the circuit of control switching loop circuit state become simple accurate to simplify switching foundation.
Under the control model of the application, the output voltage of resonance circuit 2 needs control loop quick response, output when high
Control loop slow response is needed when voltage is low.So switching circuit 23 detects output voltage (Vo generations in Fig. 2 of resonance circuit 2
Table output voltage), when the output voltage of resonance circuit 2 is not less than set voltage, control feedback regulating circuit 21 switches to soon
Ring, to accelerate the response speed that it changes output parameter；When the output voltage of resonance circuit 2 is less than set voltage, control
Feedback regulating circuit 21 processed switches to slow ring, to slow down the response speed that it changes output parameter, to stability contorting electricity
Road 1.
The present invention provides a kind of LED drive circuit, the LED drive circuit in the application includes control circuit and resonance electricity
Road, compared with voltage-controlled type control circuit in the prior art, the control circuit in the application includes feedback regulating circuit, shutdown control
Circuit processed and switching circuit.Wherein, feedback regulating circuit detects the output parameter of resonance circuit and obtains detection parameters first, and will
It is poor that given basic parameter is made with detection parameters, then adjusts deviation through proportional integration to obtain feedback voltage, feedback electricity here
Pressure represents the two departure degree.Then, switch off control circuit when detecting that the voltage of resonant capacitance rises to feedback voltage, control
The switching tube shutdown being attached thereto, to adjust the drive signal of upper switch pipe and lower switch pipe, so as to adjust the work of resonance circuit
Working frequency, and the size of the output parameter by working frequency control resonance circuit, make output parameter move closer to given benchmark
Parameter, to stablize output parameter.
Under the control model of the application, the stability of control circuit depends no longer on the output power of resonance circuit, only
Related to the output voltage of resonance circuit, specifically, switching circuit detects that the output voltage of resonance circuit is not less than set electricity
When pressure, control feedback regulating circuit switches to fast ring, to accelerate the response speed of feedback regulating circuit, conversely, switching to slow ring.
As it can be seen that only control circuit, which need to can be arranged, according to the output voltage of resonance circuit in switching circuit is operated in fast ring or slow ring,
To simplify switching foundation；Since the switching foundation of switching circuit is only related to the output voltage of resonance circuit, even if LED is filled
It sets with dimming function, without dim signal is considered, to which the circuit for making control switch loop circuit state becomes simple accurate.
Fig. 3 is please referred to, Fig. 3 is the structural schematic diagram of another LED drive circuit provided by the invention, LED driving electricity
Road is on the basis of the above embodiments：
As a kind of preferred embodiment, the output parameter of the resonance circuit 2 of detection is specially output current.
Specifically, in the application feedback regulating circuit 21 detect be resonance circuit 2 output current (the Io tables in Fig. 3
Show output current), then what control circuit 1 controlled is the output current of resonance circuit 2.
As a kind of preferred embodiment, the output end of resonance circuit 2 includes output plus terminal and output negative terminal；Feedback regulation
Circuit 21 includes sampling resistor Rsc, input resistance Re, operational amplifier U and loop circuit 211, wherein：
The first end of sampling resistor Rsc is connect with the output negative terminal of resonance circuit 2, common end grounding, sampling resistor Rsc
Second end connect respectively with the first end of the input negative terminal of LED matrix and input resistance Re, the second end of input resistance Re point
It is not connect with the first end of the input negative terminal of operational amplifier U and loop circuit 211, the input positive terminal input of operational amplifier U
Given basic parameter, the output end of operational amplifier U are connect with the second end of loop circuit 211, and common end is adjusted as feedback
Economize on electricity the output end on road 21, the switch terminal of the switch terminal of loop circuit 211 as feedback regulating circuit 21；
Then switching circuit 23 is specifically used for, when the output voltage of the resonance circuit 2 of detection is not less than predeterminated voltage, increasing
The equivalent resistance of loop circuit 211 or the equivalent capacitance value for reducing loop circuit 211, to control the switching of feedback regulating circuit 21
To fast ring, conversely, switching to slow ring.
Specifically, about " detection " of feedback regulating circuit 21, detection circuit should be set inside feedback regulating circuit 21, with inspection
The output parameter for surveying resonance circuit 2 obtains detection signal (detection parameters), for example the output current of resonance circuit 2 is adopted by series connection
Sample resistance detection, to obtain current detection signal；The output voltage of resonance circuit 2 is detected by divider resistance, to obtain
Voltage detection signal.Similarly, " detection " of switching circuit 23 is also that detection circuit is accordingly set in circuit.
What it is based on the detection of feedback regulating circuit 21 is the output current of resonance circuit 2, and feedback regulating circuit 21 includes sampling
Resistance Rsc, input resistance Re, operational amplifier U and loop circuit 211, wherein the amplification of operational amplifier U is adjusted actually
It is that proportional integration is adjusted, determines that scale parameter, capacitance determine integral ginseng according to the resistance in loop circuit 211 and input resistance Re
Number.
The principle of feedback regulating circuit 21：Sampling resistor Rsc is detected the output current of resonance circuit 2, obtains electricity
Stream detection signal, current detection signal obtain the input voltage of the input negative terminal of operational amplifier U after input resistance Re current limlitings,
Since the input positive terminal input of operational amplifier U gives basic parameter (Vr in Fig. 3 indicates to give basic parameter), so operation
Amplifier U seeks the difference of given basic parameter and input voltage, and it is corresponded to according to loop circuit 211 and input resistance Re
Proportional integration parameter the two difference is adjusted, obtain feedback voltage.
For foregoing circuit, the application is actually by the stabilized input voltage of operational amplifier U input negative terminals to given
Basic parameter, and what input voltage represented is the output current of resonance circuit 2, so joining to given basic parameter setting is specific
When numerical value, actual circuit should be directed to and be arranged.
In addition, for the feedback regulating circuit 21 of the present embodiment, switching circuit 23 controls the loop of feedback regulating circuit 21
The principle of state switching：When the output voltage of the resonance circuit 2 of detection is not less than set voltage, switching circuit 23 increases loop
The equivalent resistance of circuit 211 or the equivalent capacitance value for reducing loop circuit 211, switch to control feedback regulating circuit 21
Fast ring；When the output voltage of the resonance circuit 2 of detection is less than set voltage, the reduction loop circuit 211 of switching circuit 23 etc.
It imitates resistance value or increases the equivalent capacitance value of loop circuit 211, slow ring is switched to control feedback regulating circuit 21.
As a kind of preferred embodiment, loop circuit 211 includes first switch pipe K1, first resistor R1, second resistance
R2,3rd resistor R3 and the first capacitance C1, wherein：
The first end of first switch pipe K1 is connect with the first end of the first end of second resistance R2 and 3rd resistor R3 respectively,
First end of its common end as loop circuit 211, the second end of 3rd resistor R3 are connect with the first end of the first capacitance C1, the
The second end of one switching tube K1 is connect with the first end of first resistor R1, the second end of first resistor R1 respectively with second resistance R2
Second end and the first capacitance C1 second end connection, second end of the common end as loop circuit 211, first switch pipe K1
Switch terminal of the control terminal as loop circuit 211.
Specifically, switching circuit 23 realizes loop circuit 211 by the break-make of control first switch pipe K1 in the present embodiment
Equivalent resistance change：When controlling first switch pipe K1 conductings, the equivalent resistance of loop circuit 211 reduces, and makes anti-
Feedback adjusts circuit 21 and switches to slow ring；When controlling first switch pipe K1 shutdowns, the equivalent resistance of loop circuit 211 increases,
Feedback regulating circuit 21 is set to switch to fast ring.
The application intermediate ring road circuit 211 can also be other circuit structures, please refer to Fig. 4 in addition to the circuit structure in Fig. 3
(a), Fig. 4 (b) and Fig. 4 (c), Fig. 4 (a) are the structural schematic diagram of the first loop circuit provided by the invention；Fig. 4 (b) is this
The structural schematic diagram of second of the loop circuit provided is provided；Fig. 4 (c) is the structure of the third loop circuit provided by the invention
Schematic diagram.
As a kind of preferred embodiment, loop circuit include second switch pipe K2, the 4th resistance R4, the 5th resistance R5 and
Second capacitance C2, wherein：
The first end of second switch pipe K2 is connect with the first end of the 5th resistance R5, and common end is as loop circuit 211
First end, the second end of second switch pipe K2 connect with the first end of the 4th resistance R4, the second end difference of the 4th resistance R4
It is connect with the first end of the second end of the 5th resistance R5 and the second capacitance C2, the second end of the second capacitance C2 is as loop circuit
211 second end, the switch terminal of the control terminal of second switch pipe K2 as loop circuit 211.
Fig. 4 (a) is please referred to, similarly, switching circuit 23 passes through the break-make of control second switch pipe K2, reality in the present embodiment
The change of the equivalent resistance of existing loop circuit 211, and then realize the switching of the loop circuit state of feedback regulating circuit 21.
Alternatively, please refer to Fig. 4 (b), loop circuit 211 include third switching tube K3, third capacitance C3, the 4th capacitance C4 and
6th resistance R6, wherein：
The first end of third switching tube K3 is connect with the first end of the 4th capacitance C4, and common end is as loop circuit 211
First end, the second end of third switching tube K3 connect with the first end of third capacitance C3, the second end difference of third capacitance C3
It is connect with the first end of the second end of the 4th capacitance C4 and the 6th resistance R6, the second end of the 6th resistance R6 is as loop circuit
211 second end, the switch terminal of the control terminal of third switching tube K3 as loop circuit 211.
Specifically, switching circuit 23 realizes loop circuit 211 by the break-make of control third switching tube K3 in the present embodiment
Equivalent capacitance value change：When controlling third switching tube K3 conductings, the equivalent capacitance value of loop circuit 211 increases, and makes anti-
Feedback adjusts circuit 21 and switches to slow ring；When controlling third switching tube K3 shutdowns, the equivalent capacitance value of loop circuit 211 reduces,
Feedback regulating circuit 21 is set to switch to fast ring.
Alternatively, please refer to Fig. 4 (c), loop circuit 211 include the 7th resistance R7, the 8th resistance R8, the 4th switching tube K4 and
5th capacitance C5, wherein：First end of the first end of 7th resistance R7 as loop circuit 211, the second end of the 7th resistance R7
It is connect respectively with the first end of the first end of the 8th resistance R8 and the 4th switching tube K4, the second end of the 8th resistance R8 is respectively with
The second end of four switching tube K4 and the first end connection of the 5th capacitance C5, the second end of the 5th capacitance C5 is as loop circuit 211
Second end, the switch terminal of the control terminal of the 4th switching tube K4 as loop circuit 211.
It is understood that as long as the switching tube of loop circuit 211 can change the big of 211 equivalent resistance value of loop circuit
Small or equivalent capacitance value size is not limited to the embodiment that the application mentions.
As a kind of preferred embodiment, switching off control circuit 22 includes：
Input terminal as switch off control circuit 22 input terminal comparison circuit, for compare the voltage of resonant capacitance with it is anti-
Feedthrough voltage generates cut-off signals when the voltage of resonant capacitance rises to feedback voltage；
Driving circuit for when detecting cut-off signals, controlling selected switching tube shutdown, and accordingly adjusts another open
Close the drive signal of pipe.
Specifically, switch off control circuit 22 include comparison circuit and driving circuit, first by comparison circuit compare resonance electricity
The voltage and feedback voltage of appearance generate cut-off signals, and be input to driving when the voltage of resonant capacitance rises to feedback voltage
Circuit；Then selected switching tube shutdown is controlled after receiving cut-off signals by driving circuit, and accordingly adjusts another switch
The drive signal of pipe.
As a kind of preferred embodiment, comparison circuit is specially first comparator U1, and wherein the one of first comparator U1
Input terminal of a input terminal as comparison circuit, first comparator U1 another input terminal input resonant capacitance voltage or its
Sampled value, the output end of first comparator U1 and the input terminal of driving circuit connect.
Further, the comparison circuit in the application can select first comparator U1, the input terminal of first comparator U1
There are two types of connection types：The first, input terminal (the input feedback electricity of the input positive terminal of first comparator U1 as comparison circuit
Pressure), input negative terminal input resonant capacitance voltage (be not suitable for being input to control circuit 1 when the overtension of usual resonant capacitance
In, therefore, the sampled value of input resonant capacitor voltage is generally selected here), when on the voltage (or its sampled value) of resonant capacitance
When rising to feedback voltage, the output of first comparator U1 switchs to low level by high level, that is, generates cut-off signals；Second, the
The input negative terminal of one comparator U1 inputs voltage (or its sampling of resonant capacitance as the input terminal of comparison circuit, input positive terminal
Value), when the voltage of resonant capacitance rises to feedback voltage, the output of first comparator U1 switchs to high level by low level, i.e.,
Generate cut-off signals.
As a kind of preferred embodiment, switching circuit 23 includes：
Detection comparison circuit of the test side as the test side of switching circuit 23, the output electricity for detecting resonance circuit 2
Pressure, and compare the output voltage and predeterminated voltage of detection, when the output voltage of detection is not less than predeterminated voltage, output end generates
Fast ring switching signal, conversely, generating slow ring switching signal；
Drive switch driving circuit of the end as the control terminal of switching circuit 23, for ought detect fast ring switching signal or
When the slow ring switching signal of person, respective drive feedback regulating circuit 21 switches to fast ring or slow ring, accordingly to accelerate or slow down its sound
Answer speed.
Specifically, switching circuit 23 includes detection comparison circuit and switch driving circuit, is examined first by detection comparison circuit
The output voltage of resonance circuit 2 is surveyed, and compares the output voltage of detection and set voltage, when the output voltage of detection is not less than institute
If when voltage, generating fast ring switching signal；When the output voltage of detection is less than set voltage, slow ring switching signal is generated, and
Fast ring switching signal or slow ring switching signal are input to switch driving circuit；Then fast ring is being received by switch driving circuit
Respective drive feedback regulating circuit 21 switches to fast ring or slow ring after switching signal or slow ring switching signal.
As a kind of preferred embodiment, the test side for detecting comparison circuit includes the first test side and the second test side,
The output end of resonance circuit 2 includes output plus terminal and output negative terminal, detects the first test side and the resonance circuit 2 of comparison circuit
Output plus terminal connects, and the second test side for detecting comparison circuit is connect with the output negative terminal of resonance circuit 2, common end grounding；
It detects comparison circuit and includes the first divider resistance Rd1, the second divider resistance Rd2 and the second comparator U2, wherein：
First test side of the first end of first divider resistance Rd1 as detection comparison circuit, the first divider resistance Rd1's
Second end is connect with one of the first end of the second divider resistance Rd2 and the second comparator U2 input terminal respectively, second point
Second test side of the second end of piezoresistance Rd2 as detection comparison circuit, another input terminal input of the second comparator U2
Predeterminated voltage, the output end of the second comparator U2 is as the output end for detecting comparison circuit.
Further, the detection comparison circuit in the application include the first divider resistance Rd1, the second divider resistance Rd2 and
Second comparator U2, wherein the first divider resistance Rd1 and the second divider resistance Rd2 is used to detect the output electricity of resonance circuit 2
Pressure, the signal divided is the detection signal of output voltage；There are two types of connection types for the input terminal of second comparator U2：The
One kind, the input positive terminal input detection signal of the second comparator U2, input negative terminal input set voltage (set by Vs is represented in Fig. 3
Voltage), when the voltage for detecting signal is not less than set voltage, the second comparator U2 output high level, i.e., fast ring switching signal,
Conversely, output low level, i.e., slow ring switching signal；Second, the set voltage of input positive terminal input of the second comparator U2, input
Negative terminal input detection signal, when the voltage for detecting signal is not less than set voltage, the second comparator U2 exports low level, i.e., soon
Ring switching signal, conversely, output high level, i.e., slow ring switching signal.
The present invention also provides a kind of lighting apparatus, including LED matrix, further include any of the above-described kind of LED drive circuit.
The introduction of lighting apparatus provided by the present application, please refers to above-mentioned driving circuit embodiment, and the application is no longer superfluous herein
It states.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only that
A little elements, but also include other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (10)
1. a kind of LED drive circuit, which is characterized in that the upper switch including control circuit and comprising resonant capacitance and alternate conduction
Resonance circuit of the pipe with lower switch pipe, for driving Light-emitting diode LED device luminous, wherein the control circuit includes：
Feedback regulating circuit, the output parameter for detecting the resonance circuit, and by default given basic parameter and obtain
It is poor that detection parameters are made, and deviation adjusted through proportional integration to obtain feedback voltage；
Input terminal switches off control circuit with what the output end of the feedback regulating circuit was connect, for the electricity when the resonant capacitance
When pressure rises to the feedback voltage, any selected switching tube shutdown in the resonance circuit is controlled, and accordingly adjust another
The drive signal of switching tube；
Test side is connect with the output end of the resonance circuit, control terminal is cut with what the switch terminal of the feedback regulating circuit was connect
Circuit is changed, for when the output voltage of the resonance circuit of detection is not less than predeterminated voltage, controlling the feedback regulation electricity
Road switches to fast ring, to accelerate its response speed, conversely, switching to slow ring.
2. LED drive circuit as described in claim 1, which is characterized in that the output parameter of the resonance circuit of detection has
Body is output current.
3. LED drive circuit as claimed in claim 2, which is characterized in that the output end of the resonance circuit includes exporting just
End and output negative terminal；The feedback regulating circuit includes sampling resistor, input resistance, operational amplifier and loop circuit, wherein：
The first end of the sampling resistor is connect with the output negative terminal of the resonance circuit, common end grounding, the sampling electricity
The second end of resistance is connect with the first end of the input negative terminal of the LED matrix and the input resistance respectively, the input resistance
Second end connect respectively with the first end of the input negative terminal of the operational amplifier and the loop circuit, the operation amplifier
The input positive terminal of device inputs the given basic parameter, the second end of the output end of the operational amplifier and the loop circuit
Connection, the switch terminal of output end of the common end as the feedback regulating circuit, the loop circuit are adjusted as the feedback
The switch terminal on economize on electricity road；
Then the switching circuit is specifically used for, when the output voltage of the resonance circuit of detection is not less than predeterminated voltage, increasing
The equivalent resistance of the loop circuit or the equivalent capacitance value for reducing the loop circuit, to control the feedback regulating circuit
Fast ring is switched to, conversely, switching to slow ring.
4. LED drive circuit as claimed in claim 3, which is characterized in that the loop circuit includes first switch pipe, first
Resistance, second resistance, 3rd resistor and the first capacitance, wherein：
The first end of the first switch pipe connects with the first end of the first end of the second resistance and the 3rd resistor respectively
It connects, first end of the common end as the loop circuit, the second end of the 3rd resistor and the first of first capacitance
End connection, the second end of the first switch pipe are connect with the first end of the first resistor, the second end of the first resistor
It is connect respectively with the second end of the second end of the second resistance and first capacitance, common end is as the loop circuit
Second end, the switch terminal of the control terminal of the first switch pipe as the loop circuit.
5. LED drive circuit as claimed in claim 3, which is characterized in that the loop circuit includes second switch pipe, the 4th
Resistance, the 5th resistance and the second capacitance, wherein：
The first end of second switch pipe is connect with the first end of the 5th resistance, first end of the common end as loop circuit, the
The second end of two switching tubes is connect with the first end of the 4th resistance, the second end of the 4th resistance second end with the 5th resistance respectively
And second capacitance first end connection, the second end of the second end of the second capacitance as loop circuit, the control of second switch pipe
Hold the switch terminal as loop circuit.
6. LED drive circuit as described in claim 1, which is characterized in that it is described switch off control circuit including：
The comparison circuit for the input terminal that input terminal switches off control circuit as described in, for the resonant capacitance voltage with
The feedback voltage generates cut-off signals when the voltage of the resonant capacitance rises to the feedback voltage；
Driving circuit, for when detecting the cut-off signals, controlling selected switching tube shutdown, and accordingly adjustment is another
The drive signal of one switching tube.
7. LED drive circuit as claimed in claim 6, which is characterized in that the comparison circuit is specially first comparator, institute
Input terminal of one of first comparator input terminal as the comparison circuit is stated, another of the first comparator is defeated
Enter voltage or its sampled value that end inputs the resonant capacitance, the output end of the first comparator is defeated with the driving circuit
Enter end connection.
8. such as claim 1-7 any one of them LED drive circuits, which is characterized in that the switching circuit includes：
Detection comparison circuit of the test side as the test side of the switching circuit, the output electricity for detecting the resonance circuit
Pressure, and compare the output voltage and predeterminated voltage of detection, it is defeated when the output voltage of detection is not less than the predeterminated voltage
Outlet generates fast ring switching signal, conversely, generating slow ring switching signal；
Switch driving circuit of the end as the control terminal of the switching circuit is driven, the fast ring switching signal is detected for working as
Or when the slow ring switching signal, feedback regulating circuit switches to fast ring or slow ring described in respective drive, accordingly to accelerate or
Slow down its response speed.
9. LED drive circuit as claimed in claim 8, which is characterized in that the test side of the detection comparison circuit includes the
The output end of one test side and the second test side, the resonance circuit includes output plus terminal and output negative terminal, and the detection is compared
First test side of circuit is connect with the output plus terminal of the resonance circuit, the second test side of the detection comparison circuit and institute
State the output negative terminal connection of resonance circuit, common end grounding；The detection comparison circuit include the first divider resistance, second point
Piezoresistance and the second comparator, wherein：
First test side of the first end of first divider resistance as the detection comparison circuit, first divider resistance
Second end connect respectively with one of the first end of second divider resistance and second comparator input terminal, institute
State the second test side of the second end of the second divider resistance as the detection comparison circuit, second comparator another
Input terminal inputs the predeterminated voltage, and the output end of second comparator is as the output end for detecting comparison circuit.
10. a kind of lighting apparatus, which is characterized in that further include such as claim 1-9 any one of them LED including LED matrix
Driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810644245.6A CN108770124B (en) | 2018-06-21 | 2018-06-21 | LED drive circuit and lighting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810644245.6A CN108770124B (en) | 2018-06-21 | 2018-06-21 | LED drive circuit and lighting equipment |
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| CN108770124A true CN108770124A (en) | 2018-11-06 |
| CN108770124B CN108770124B (en) | 2023-08-18 |
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| CN1909351A (en) * | 2006-06-30 | 2007-02-07 | 艾默生网络能源有限公司 | Feedback circuit adapted for series resonance dc-dc converter |
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| US20120181952A1 (en) * | 2011-01-14 | 2012-07-19 | Norbert Roeer | Drive circuit for light-emmiting diode array |
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| US20140103962A1 (en) * | 2012-10-11 | 2014-04-17 | Sl3J Systems S.A.R.L. | High-speed gate driver for power switches with reduced voltage ringing |
| CN104143920A (en) * | 2013-05-10 | 2014-11-12 | 国钰电子(北海)有限公司 | Resonant transformation circuit |
| WO2016000259A1 (en) * | 2014-07-04 | 2016-01-07 | 深圳欧陆通电子有限公司 | Power supply |
| CN208490012U (en) * | 2018-06-21 | 2019-02-12 | 英飞特电子（杭州）股份有限公司 | A kind of LED drive circuit and lighting apparatus |
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|---|---|---|---|---|
| CN1909351A (en) * | 2006-06-30 | 2007-02-07 | 艾默生网络能源有限公司 | Feedback circuit adapted for series resonance dc-dc converter |
| US20100283391A1 (en) * | 2006-11-26 | 2010-11-11 | Tritonics Technologies Ltd | PLC based smart dimmers that function with no new wires |
| US20130100713A1 (en) * | 2010-07-14 | 2013-04-25 | Delta Electronics (Shanghai) Co., Ltd | Switching power conversion circuit and power supply using same |
| US20120181952A1 (en) * | 2011-01-14 | 2012-07-19 | Norbert Roeer | Drive circuit for light-emmiting diode array |
| US20140103962A1 (en) * | 2012-10-11 | 2014-04-17 | Sl3J Systems S.A.R.L. | High-speed gate driver for power switches with reduced voltage ringing |
| CN104143920A (en) * | 2013-05-10 | 2014-11-12 | 国钰电子(北海)有限公司 | Resonant transformation circuit |
| WO2016000259A1 (en) * | 2014-07-04 | 2016-01-07 | 深圳欧陆通电子有限公司 | Power supply |
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|---|---|
| CN108770124B (en) | 2023-08-18 |
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Denomination of invention: A LED driver circuit and lighting equipment Granted publication date: 20230818 Pledgee: Industrial and Commercial Bank of China Limited Hangzhou Qianjiang Branch Pledgor: INVENTRONICS (HANGZHOU), Inc. Registration number: Y2024330000378 |
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