CN110461055A - Illumination driving circuit and method and lighting system - Google Patents
Illumination driving circuit and method and lighting system Download PDFInfo
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- CN110461055A CN110461055A CN201910547062.7A CN201910547062A CN110461055A CN 110461055 A CN110461055 A CN 110461055A CN 201910547062 A CN201910547062 A CN 201910547062A CN 110461055 A CN110461055 A CN 110461055A
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- 238000005286 illumination Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 85
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 85
- 239000010703 silicon Substances 0.000 claims abstract description 85
- 230000003466 anti-cipated effect Effects 0.000 claims abstract description 66
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000012512 characterization method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- 238000012886 linear function Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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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]
Abstract
The invention discloses a kind of illumination driving circuits and method and lighting system, the rectified bridge of AC power source obtains input voltage to load supplying, controllable silicon dimmer is connected between the AC power source and rectifier bridge, the driving circuit includes controlled silicon conducting moment detection circuit, first module, second module and current regulating circuit, the controlled silicon conducting moment detection circuit detects silicon-controlled turn-on instant, obtain silicon-controlled turn-on instant signal, first module receives silicon-controlled turn-on instant signal, obtain anticipated output average current value, second module receives anticipated output average current value, and sample load current, load current reference value is adjusted according to anticipated output average current value and load current, the current regulating circuit receives load current reference value, so that load current is equal to load current reference value.Output average current of the invention will not change with input voltage or load voltage, improve consistency and line regulation.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of illumination driving circuit and method and illumination system
System.
Background technique
In illumination driving circuit, LED is common lighting source, by taking LED drive circuit as an example, the prior art it is linear
LED drive circuit is at low cost since route is simple, is widely used in lighting system.As shown in Figure 1, linear for the prior art
LED drive circuit schematic diagram, the first end of the negative terminal connection adjustment pipe M1 of the LED, the second end of adjustment pipe M1 connect sampling
One end of resistance, sampling resistor other end ground connection, the public affairs of first input end connection the adjustment pipe and sampling resistor of operational amplifier
End altogether, the second input terminal receive reference voltage Vref, the control terminal of output end connection adjustment pipe M1, and sampling resistor R1 is adopted
Sample flows through the electric current of LED, and the operational amplifier U1 and adjustment pipe M1 form negative-feedback circuit, and operational amplifier U1 is relatively adopted
Voltage and reference voltage Vref on sample resistance R1 are equal to the current sampling data of LED by the grid of control adjustment pipe M1
Vref/R1。
Fig. 2 give input voltage be Vin1 when, with the controllable silicon dimmer angle of flow variation LED electric current variation
Figure, Fig. 3 give input voltage be Vin2 when, with the controllable silicon dimmer angle of flow variation LED current variation diagram,
In, t1, t2, t3 are three turn-on instants of controllable silicon dimmer, and T1 is LED turn-on time, and T is the input voltage period.From figure
2 and Fig. 3 can be seen that during controllable silicon dimmer conducting, and when voltage of the input voltage greater than LED, LED conducting, output
Average current is ILED*(T1/T).Compare Fig. 2 and Fig. 3 it can be concluded that, input voltage variation after, even if controllable silicon dimmer is led
Current flow angle degree is constant, and the turn-on time T1 of LED is also changed, so that output average current is changed.Therefore,
There are following technical problems for the linear LED drive circuit of the prior art: when input voltage or LED voltage change, output is average
Electric current can also change, and consistency is poor, i.e., its line regulation is poor.
Summary of the invention
In view of this, the purpose of the present invention is to provide the illuminations of a kind of raising line regulation and consistency to drive electricity
There is output average current with input voltage or load voltage to solve the prior art in road and method and lighting system
The technical issues of changing and changing.
The present invention provides a kind of illumination driving circuit, the rectified bridge of AC power source obtains input voltage to load supplying,
Controllable silicon dimmer is connected between the AC power source and rectifier bridge, the driving circuit includes the inspection of controlled silicon conducting moment
Slowdown monitoring circuit, the first module, the second module and current regulating circuit, the controlled silicon conducting moment detection circuit detection are silicon-controlled
Turn-on instant, obtain silicon-controlled turn-on instant signal, first module receives silicon-controlled turn-on instant signal, obtains
To anticipated output average current value, second module receives anticipated output average current value, and samples load current, according to
Anticipated output average current value and load current adjust load current reference value, and the current regulating circuit receives load current
Reference value, so that load current is equal to load current reference value.
Preferably, the first signal is generated according to anticipated output average current value and load current, according to first signal
With the second signal adjusting load current reference value, the variation tendency of the second signal and input voltage is opposite.
Preferably, first module sets anticipated output average current value according to silicon-controlled turn-on instant, when controllable
When silicon turn-on instant is earlier than the first moment, the anticipated output average current value is equal to the first electric current；When the controlled silicon conducting moment
When being later than for the first moment earlier than the second moment, the anticipated output average current value changes with the controlled silicon conducting moment；When can
When control silicon turn-on instant was later than for the second moment, the anticipated output average current value is the second electric current；First moment is later than
At the time of input voltage is equal to load voltage for the first time in a cycle, second moment is electric earlier than exporting in a cycle
At the time of pressure is equal to load voltage for the second time.
Preferably, when being later than for the first moment earlier than the second moment at the controlled silicon conducting moment, the average electricity of the anticipated output
Flow valuve is equal to the product of the first coefficient and the first electric current, and first coefficient is the difference at the second moment and controlled silicon conducting moment
It is worth the difference than the second moment and the first moment.
Preferably, second module includes first capacitor, using the current source of characterization output average current to the first electricity
Capacity charge discharges to first capacitor using the current source of characterization load current, the voltage characterization load electricity in the first capacitor
Flow reference value.
Preferably, the current regulating circuit and load in series, the current regulating circuit include the first adjustment pipe and tune
Homogeneous tube control circuit, the load are connected with the first adjustment pipe, adjustment control circuit sampling load current processed, and according to
Load current and load current reference value, to adjust the control terminal of the first adjustment pipe, so that load current is equal to load electricity
Flow reference value.
Preferably, the illumination driving circuit is LED drive circuit.
Of the invention also proposed a kind of illumination driving method, comprising the following steps:
Silicon-controlled turn-on instant is detected, silicon-controlled turn-on instant signal is obtained；
Silicon-controlled turn-on instant signal is received, anticipated output average current value is obtained；
Anticipated output average current value is received, and samples load current, according to anticipated output average current value and load electricity
Stream adjusts load current reference value；
Load current reference value is received, so that load current is equal to load current reference value.
Preferably, the first signal is generated according to anticipated output average current value and load current, according to first signal
With the second signal adjusting load current reference value, the variation tendency of the second signal and input voltage is opposite.
Preferably, anticipated output average current value is set according to silicon-controlled turn-on instant, when morning at controlled silicon conducting moment
When the first moment, the anticipated output average current value is equal to the first electric current；It was later than for the first moment when the controlled silicon conducting moment
When earlier than the second moment, the anticipated output average current value changes with the controlled silicon conducting moment；When the controlled silicon conducting moment
When being later than for the second moment, the anticipated output average current value is the second electric current；First moment is later than defeated in a cycle
Enter voltage for the first time at the time of be equal to load voltage, second moment is equal to for the second time earlier than output voltage in a cycle
At the time of load voltage.
Preferably, when being later than for the first moment earlier than the second moment at the controlled silicon conducting moment, the average electricity of the anticipated output
Flow valuve is equal to the product of the first coefficient and the first electric current, and first coefficient is the difference at the second moment and controlled silicon conducting moment
It is worth the difference than the second moment and the first moment.
The present invention also provides a kind of lighting systems, including any one of the above illumination driving circuit.
Using circuit structure of the invention, compared with prior art, current regulation electricity of the invention is had the advantage that
Road has instantaneous value current-limiting function, so that load current is equal to load current reference value, the first module is according to silicon-controlled conducting
Anticipated output average current value is arranged in moment, and second module is adjusted according to anticipated output average current value and load current
Load current reference value, so that output average current is anticipated output average current value.The present invention is adjusted by closed loop,
It will not change with input voltage or load voltage to export average current, improve consistency and line regulation.
Detailed description of the invention
Fig. 1 is the LED drive circuit schematic diagram of the prior art；
Fig. 2 is the prior art when input voltage is V1, the waveform diagram that load current changes with the angle of flow；
Fig. 3 is the prior art when input voltage is V2, the waveform diagram that load current changes with the angle of flow；
Fig. 4 is the circuit structure diagram of illumination driving circuit of the invention；
Efficient LED driver circuit schematic diagram Fig. 5 of the invention；
Fig. 6 is the waveform diagram that load current of the present invention changes with the angle of flow；
Fig. 7 is that embodiment schematic diagram is arranged in the anticipated output average current value of the first module of the invention；
Fig. 8 is the embodiment schematic diagram of the second module of the invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to this
A little embodiments.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, tool is described in detail in the following preferred embodiment of the present invention
The details of body, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Fig. 4 illustrates the schematic diagram of illumination driving circuit of the invention, loads by taking LED as an example, and input power is to hand over
Stream input, the rectified bridge of AC power source obtain input voltage to load supplying, are connected between the AC power source and rectifier bridge
Controllable silicon dimmer, exchange input are connected to rectifier bridge by controllable silicon dimmer, and the positive output end of rectifier bridge is connected to load
Anode, load negative terminal are connected to the negative output terminal of rectifier bridge by current regulating circuit.
The driving circuit includes controlled silicon conducting moment detection circuit, the first module, the second module and current regulation electricity
Road, the controlled silicon conducting moment detection circuit detect silicon-controlled turn-on instant, obtain silicon-controlled turn-on instant signal,
First module receives silicon-controlled turn-on instant signal, obtains anticipated output average current value, and second module receives
Anticipated output average current value, and load current is sampled, load electricity is adjusted according to anticipated output average current value and load current
Reference value is flowed, the current regulating circuit receives load current reference value, so that load current is equal to load current reference value.
The current regulating circuit and load in series, the current regulating circuit include the first adjustment pipe M1 and adjustment pipe
Control circuit, the load are connected with the first adjustment pipe M1, and circuit sampling load current processed is managed in the adjustment, and according to negative
Electric current and load current reference value are carried, to adjust the control terminal of the first adjustment pipe, so that load current is equal to load current
Reference value.The adjustment pipe control circuit includes the of the first operational amplifier and sampling resistor R1, the first adjustment pipe M1
One end connection load LED negative terminal, second end connect one end of sampling resistor R1, and the other end of sampling resistor R1 connects rectification
The first input end of the negative output terminal of bridge, the first operational amplifier U1 receives reference voltage Vref, first operation
Second input terminal of amplifier connects the common end of the sampling resistor R1 and the first adjustment pipe M1, described in output end connection
The control terminal of the first adjustment pipe.The load current reference value is equal to reference voltage Vref/R1, when R1 is fixed, the load
Current reference value is only related with the reference voltage, thus in the present invention adjust load current reference value actually adjust be ginseng
Examine voltage value.
Fig. 5 illustrates the schematic diagram of efficient illumination driving circuit of the invention；According to anticipated output average current value and bear
It carries electric current and generates the first signal, adjust the load current reference value according to the first signal and the second signal, described second
The variation tendency of signal and input voltage is opposite.Due to second signal and input voltage trend on the contrary, so that load current compared with
It is low, and keep constant, to reach efficient purpose.
Rest part is identical with illumination driving circuit described in Fig. 4.
Fig. 6 is the waveform diagram that load current of the present invention changes with the angle of flow；Wherein T_TRIAC refers to controlled silicon conducting
Moment, T1 were the first moment, and T2 was the second moment, and Vin is input voltage.T1, T2 are two moment chosen, the first moment
At the time of T1 is later than in a cycle input voltage and is equal to load voltage for the first time, the second moment T2 is earlier than a cycle
At the time of interior output voltage is equal to load voltage for the second time.It can be seen that when the controlled silicon conducting moment, T_TRIAC was earlier than T1,
The then entire section T1 to T2 load is all conducting, when controlled silicon conducting moment T_TRIAC is earlier than T2 and is later than T1, then T1
There was only load conduction in the T_TRIAC-T2 period in the section T2, when controlled silicon conducting moment T_TRIAC is later than T2, then T1-
The load of the section T2 is not turned on completely.
Therefore the first module sets anticipated output average current value according to silicon-controlled turn-on instant, when controlled silicon conducting
When carving earlier than the first moment, the anticipated output average current value is equal to the first electric current；It is later than first when the controlled silicon conducting moment
When moment is earlier than the second moment, the anticipated output average current value changes with the controlled silicon conducting moment；Work as controlled silicon conducting
When moment was later than for the second moment, the anticipated output average current value is the second electric current；First moment is later than a cycle
At the time of interior input voltage is equal to load voltage for the first time, second moment is earlier than second of output voltage in a cycle
At the time of equal to load voltage.
Wherein when being later than for the first moment earlier than the second moment at the controlled silicon conducting moment, the anticipated output average current
Value can according to need setting, is the linear or nonlinear function at controlled silicon conducting moment, exports average current at this time
It will not change with the variation of input voltage.First electric current and the second electric current are also configured as needed.
During the first module anticipated output average current value setting embodiment described in Fig. 7 is illustrated, when controlled silicon conducting
When being later than for the first moment quarter earlier than the second moment, the anticipated output average current value can according to need setting, be silicon-controlled
The linear function of turn-on instant.Second electric current is 0.Specifically, the controlled silicon conducting moment detection circuit detection can
The turn-on instant for controlling silicon, obtains silicon-controlled turn-on instant signal, and first module is set according to silicon-controlled turn-on instant
Anticipated output average current value carves when the triac is conductive earlier than T1, ILED_AVERAGE=I1, carves evening when the triac is conductive
In T2, ILED_AVERAGE=0, when TRAIC turn-on instant is between T1 and T2, the first system of ILED_AVERAGE=I1*
Number, wherein the first coefficient is (T2-T_TRIAC)/(T2-T1).
Wherein anticipated output average current value is set to off in the linear function of controlled silicon conducting moment T_TRIAC, at it
In his embodiment, nonlinear function may be set to be, the present invention simply shows a kind of embodiment of setting, but its
Anticipated output average current value is set to off other functions in controlled silicon conducting moment T_TRIAC and also existed by he relevant
In protection scope of the present invention.First electric current, which can according to need, to be configured.
Anticipated output average current value is arranged in the present invention, (or is also wrapped according to anticipated output average current value and load current
Include second signal) load current reference value is adjusted, so that output average current value is equal to anticipated output average current value.Fig. 7 is
Its one embodiment being arranged.
First module calculates the dimming curve of anticipated output average current value, the second module according to controlled silicon conducting angle
It receives anticipated output average current value and passes through sampling load current (or further including second signal) simultaneously, it is flat according to anticipated output
Equal current value and load current (or further including second signal) adjust reference voltage, so that closed-loop control output average current is pressed
According to the dimming curve variation of anticipated output average current value.
Second module adjusts reference voltage according to anticipated output average current value and load current, so that output is flat
Equal electric current is anticipated output average current value.According to anticipated output average current value and the difference of load current average value to defeated
The integral for entering voltage cycle is equal to 0, determines the load current reference value, i.e. reference voltage.
Fig. 8 gives one embodiment of the second module, and second module includes first capacitor C1, defeated using characterizing
The current source I1 of average current charges to first capacitor C1 out, using the current source I2 of characterization load current to first capacitor C1
It discharges, the voltage Vc1 on the first capacitor C1 is reference voltage.
Physical circuit described in figure 8 above is only a kind of implementation, and replacement and variation also may be present, such as may be used
It is realized in a manner of through counter.
In addition to this, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ability
Domain those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and note is not known
The content of load then can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (12)
1. a kind of illumination driving circuit, the rectified bridge of AC power source obtains input voltage to load supplying, the AC power source and
Controllable silicon dimmer is connected between rectifier bridge, it is characterised in that: the driving circuit includes controlled silicon conducting moment detection electricity
Road, the first module, the second module and current regulating circuit, the controlled silicon conducting moment detection circuit detect silicon-controlled conducting
At the moment, silicon-controlled turn-on instant signal is obtained, first module receives silicon-controlled turn-on instant signal, obtains being expected defeated
Average current value out, second module receives anticipated output average current value, and samples load current, flat according to anticipated output
Equal current value and load current adjust load current reference value, and the current regulating circuit receives load current reference value, so that
Load current is equal to load current reference value.
2. illumination driving circuit according to claim 1, it is characterised in that: according to anticipated output average current value and load
Electric current generates the first signal, adjusts the load current reference value, second letter according to the first signal and the second signal
It is number opposite with the variation tendency of input voltage.
3. illumination driving circuit according to claim 1 or 2, it is characterised in that: first module is according to silicon-controlled
Turn-on instant sets anticipated output average current value, and when the controlled silicon conducting moment is earlier than the first moment, the anticipated output is flat
Equal current value is equal to the first electric current；When being later than for the first moment earlier than the second moment at the controlled silicon conducting moment, the anticipated output
Average current value changes with the controlled silicon conducting moment；When being later than for the second moment at the controlled silicon conducting moment, the anticipated output
Average current value is the second electric current；First moment be later than input voltage in a cycle be equal to for the first time load voltage when
It carves, at the time of second moment is equal to load voltage earlier than output voltage in a cycle for the second time.
4. illumination driving circuit according to claim 3, it is characterised in that: be later than for the first moment when the controlled silicon conducting moment
When earlier than the second moment, the anticipated output average current value is equal to the product of the first coefficient and the first electric current, first system
Number is the difference at the second moment and controlled silicon conducting moment than the difference at the second moment and the first moment.
5. illumination driving circuit according to claim 1 or 2, it is characterised in that: second module includes first capacitor,
It is charged using the current source of characterization output average current to first capacitor, using the current source of characterization load current to first capacitor
It discharges, the voltage in the first capacitor characterizes load current reference value.
6. illumination driving circuit according to claim 1 or 2, it is characterised in that: the current regulating circuit and load string
Connection, the current regulating circuit include the first adjustment pipe and adjustment pipe control circuit, and the load is connected with the first adjustment pipe, institute
It states adjustment and manages circuit sampling load current processed, and according to load current and load current reference value, adjusted to adjust described first
The control terminal of homogeneous tube, so that load current is equal to load current reference value.
7. illumination driving circuit according to any one of claims 1 or 2, it is characterised in that: the illumination drives electricity
Road is LED drive circuit.
8. a kind of illumination driving method, which comprises the following steps:
Silicon-controlled turn-on instant is detected, silicon-controlled turn-on instant signal is obtained；
Silicon-controlled turn-on instant signal is received, anticipated output average current value is obtained；
Anticipated output average current value is received, and samples load current, according to anticipated output average current value and load current tune
Save load current reference value；
Load current reference value is received, so that load current is equal to load current reference value.
9. illumination driving method according to claim 8, it is characterised in that: according to anticipated output average current value and load
Electric current generates the first signal, adjusts the load current reference value, second letter according to the first signal and the second signal
It is number opposite with the variation tendency of input voltage.
10. illumination driving method according to claim 8 or claim 9, it is characterised in that: set according to silicon-controlled turn-on instant
Anticipated output average current value, when the controlled silicon conducting moment is earlier than the first moment, the anticipated output average current value is equal to
First electric current；When being later than for the first moment earlier than the second moment at the controlled silicon conducting moment, the anticipated output average current value with
The controlled silicon conducting moment variation；When being later than for the second moment at the controlled silicon conducting moment, the anticipated output average current value is
Second electric current；At the time of first moment is later than in a cycle input voltage and is equal to load voltage for the first time, described second
At the time of moment is equal to load voltage earlier than output voltage in a cycle for the second time.
11. illumination driving method according to claim 10, it is characterised in that: when being later than first at the controlled silicon conducting moment
Carve earlier than the second moment when, the anticipated output average current value be equal to the first coefficient and the first electric current product, described first
Coefficient is the difference at the second moment and controlled silicon conducting moment than the difference at the second moment and the first moment.
12. a kind of lighting system, it is characterised in that: including any one illumination driving circuit in claim 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910547062.7A CN110461055B (en) | 2019-06-24 | 2019-06-24 | Lighting driving circuit and method and lighting system |
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| CN113038657A (en) * | 2019-12-30 | 2021-06-25 | 杰华特微电子股份有限公司 | Linear LED silicon controlled rectifier dimming driving circuit |
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