CN102480820B - Lighting device and control method thereof - Google Patents
Lighting device and control method thereof Download PDFInfo
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- CN102480820B CN102480820B CN201010558931.5A CN201010558931A CN102480820B CN 102480820 B CN102480820 B CN 102480820B CN 201010558931 A CN201010558931 A CN 201010558931A CN 102480820 B CN102480820 B CN 102480820B
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Abstract
The invention provides a lighting device and a control method of the lighting device. The lighting device comprises a first luminous module, a second luminous module, a rectifying unit and a control module. The rectifying unit converts alternating current into an input power supply. The control module is coupled to the rectifying unit, the first luminous module and the second luminous module and is used for receiving the input power supply. The control module controls the first luminous module, the second luminous module and the rectifying unit to form a first connecting state when the input power supply is less than a setting value, and controls the first luminous module, the second luminous module and the rectifying unit to form a second connecting state when the input power supply is more than the setting value. In the invention, the current peak value flowing through the luminous module in each voltage period can be reduced, and the effect of high luminous efficiency and long service life is achieved.
Description
Technical field
The present invention relates to a kind of lighting device, and be particularly related to a kind of lighting device of light-emitting diode.
Background technology
In the Driving technique of light-emitting diode (LED), general normal employing alternating current AC drives the mode of light-emitting diode.This kind of mode be for to input to rectification circuit BR by alternating current AC, alternating current AC after full-wave rectification, then via current-limiting resistance R1 to drive LED light lamp array LA, as shown in Figure 1.But this kind of type of drive may produce following shortcoming because of unsettled alternating current AC.
One, power output is unstable.In other words, the average electrical that flows through LED light lamp array LA fails to be convened for lack of a quorum and changes with the crest voltage of alternating current AC, cause the unstable problem large with luminance fluctuation of power output of LED light lamp array LA, and easily cause LED light lamp array LA to damage or light decay.
Two, luminous efficiency is low.The conducting voltage of LED light lamp array LA can be designed to approach the crest voltage of alternating current AC conventionally, and this design can cause the short situation of its ON time of lamp current of each voltage cycle.The in the situation that of short in the current lead-through time, must relatively increase the peak value of lamp current, can maintain fixing average current and flow through LED light lamp array LA.In general, the luminous intensity of light-emitting diode becomes non-linear relation with lamp current, and as when the specific currents 1A, luminous intensity is 1, and in the time increasing electric current 2A, luminous intensity is only 1.6 but not 2.Therefore, the conducting voltage of LED light lamp array LA is designed to approach to the crest voltage of alternating current AC, can cause LED light lamp array LA luminous efficiency step-down, and then remote-effects overall system efficiency, i.e. overall system efficiency=light-emitting diode drives conversion efficiency × light-emitting diode luminous efficiency.
Summary of the invention
The embodiment of the present invention provides a kind of lighting device and control method thereof, the wherein input power of lighting device after according to AC power rectification, the relation linking between light emitting module in corresponding change lighting device more than two and rectification unit, to reach high luminous efficiency and long useful life.
According to an embodiment, lighting device of the present invention receives an alternating current, comprises one first light emitting module, one second light emitting module, a rectification unit and a control module.Alternating current is changed into an input power by rectification unit.Control module is coupled to rectification unit, the first light emitting module and the second light emitting module, it receives input power, and in the time that input power is less than a reference value, control the first light emitting module, the second light emitting module and rectification unit and form the first connecting state, or in the time that input power is greater than reference value, controls the first light emitting module, the second light emitting module and rectification unit and form the second connecting state.
According to another embodiment, the control method of lighting device of the present invention, is applicable to the control of a control module to one first light emitting module and one second light emitting module, and its step includes: first, obtain an input power, this input power is the power supply of alternating current after rectification; Then,, in the time that input power is less than a reference value, controls the first light emitting module and the second light emitting module and input power and form the first connecting state; Then,, in the time that input power is greater than reference value, controls the first light emitting module and the second light emitting module and input power and form the second connecting state.
A foundation embodiment again, the control method of lighting device of the present invention, is applicable to the control of a control module to multiple light emitting modules, and its step includes: first, obtain an input power, this input power is the power supply of alternating current after rectification; Then,, in the time that input power is less than first reference value, controls multiple light emitting modules and input power and form the first connecting state; Then, be greater than this first reference value at input power, and while being less than second reference value, controlling multiple light emitting modules and input power and form the second connecting state; Then,, in the time that input power is greater than the second reference value, controls multiple light emitting modules and input power and form the 3rd connecting state.
In sum, the input power of the lighting device that the embodiment of the present invention provides after according to AC power rectification, the relation linking between two or more light emitting modules and rectification unit in corresponding change lighting device, and try to achieve under a fixing average current, can reduce the current peak that every voltage cycle flows through light emitting module, and then reach the effect of high-luminous-efficiency and long service life.
For enabling further to understand feature of the present invention and technology contents, refer to following about detailed description of the present invention and accompanying drawing, but these explanations are only used for illustrating the present invention with accompanying drawing, but not interest field of the present invention are done to any restriction.
Brief description of the drawings
Fig. 1 is traditional light-emitting diode (LED) drive circuit;
Fig. 2 is the function structure schematic diagram of the embodiment of the present invention;
Fig. 3 is the circuit diagram of first embodiment of the invention;
Fig. 4 is the circuit waveform schematic diagram of Fig. 3;
Fig. 5 is the circuit diagram of second embodiment of the invention;
Fig. 6 is the circuit diagram of third embodiment of the invention;
Fig. 7 is the circuit waveform schematic diagram of Fig. 6;
Fig. 8 is the circuit diagram of fourth embodiment of the invention;
Fig. 9 is the circuit diagram of fifth embodiment of the invention; And
Figure 10 is the circuit waveform schematic diagram of Fig. 9.
Description of reference numerals in above-mentioned accompanying drawing is as follows:
Known:
Alternating current AC
Rectification circuit BR
LED light lamp array LA
Current-limiting resistance R1
The present invention:
The first light emitting module 12
The second light emitting module 14
Alternating current AC
Earth terminal Gnd
Input power Vbr
Switch element 102
Control unit 104,501
Diode D1
The first transistor Q1
Transistor seconds Q2
Current-limiting resistance R1, R2, R3
Transistor Q3, Q4, Q5, Q6
Input voltage ratio value VR
Set point Vth
Reference value Vref
The first reference value Vref1
The second reference value Vref2
Switch element 202
Power back-off module 16,46,56
Voltage-controlled Current Source 162,462
Constant current source 164,464
Offset current Ibr
Total current ILED
Flow through the electric current I D of resistance R 6
Voltage VR6, VR12
Light emitting module 52,52A, 52B, 52C, 52D
Embodiment
The lighting device that the embodiment of the present invention provides, its type of drive utilizes the input power after AC rectification directly to drive the technology of two or more light emitting modules.In the embodiment of the present invention, preferably light emitting module can be light-emitting diode (LED) or light emitting diode matrix (LED Array), and light emitting diode matrix comprises multiple light-emitting diodes connected to one another (LED).In aforementioned, these light-emitting diodes (LED) comprise be one another in series, the annexation such as parallel connection or connection in series-parallel.But light-emitting diode or light emitting diode matrix are not the unique restriction of the present invention, all light emitting modules that can directly be driven by the input power after AC rectification are all scope of the present invention.
Consult Fig. 2.Fig. 2 is the function structure schematic diagram of the embodiment of the present invention.Lighting device 1 comprises a control module 10, a rectification unit 11, one first light emitting module 12 and one second light emitting module 14, and wherein control module 10 is coupled to rectification unit 11, the first light emitting module 12 and the second light emitting module 14.An alternating current AC is changed into an input power Vbr by rectification unit 11, the voltage waveform of this input power Vbr is the alternating current AC of sinusoidal wave (sine wave) waveform after over commutation, therefore, the voltage swing of input power Vbr changes along with alternating current AC.
Referring again to Fig. 2.Control module 10 receives input power Vbr, and detects the voltage swing of input power Vbr.Meanwhile, control module 10 is provided with a reference value, and wherein, in the time that the voltage of input power Vbr is less than reference value, control module 10 is controlled the first light emitting module 12 and the second light emitting module 14 and rectification unit 11 and formed the first connecting state.In addition, in the time that the voltage of input power Vbr is greater than reference value, 10 of control modules are controlled the first light emitting module 10 and the second light emitting module 14 and rectification unit 11 and are formed the second connecting state.
So, lighting device 1 can be according to the input power Vbr after alternating current AC rectification, the corresponding connection relationship changing between the first light emitting module 10, the second light emitting module 14 and rectification unit 11, try to achieve under a fixing average current, can reduce the current peak that every voltage cycle flows through the first light emitting module 10 and the second light emitting module 14, and then reach the effect of high-luminous-efficiency and long service life.
With reference to figure 3.Fig. 3 is the circuit diagram of first embodiment of the invention.Rectification unit 11 is a full-wave rectifier, and it is used for alternating current AC to be rectified into input power Vbr, and wherein rectification unit 11 can be a rectification chip or be connected to form by 4 diode BR1～BR4, and this,, for generally knowing technology, does not repeat them here.
Referring again to Fig. 3.Switch element 102 comprises a diode D1, a first transistor Q1 and a transistor seconds Q2, and annexation and action specification between aforementioned each element are as follows.The anode tap of diode D1 connects the output T12 of the first light emitting module 12, and the cathode terminal of diode D1 connects the input T21 of the second light emitting module 14.The defeated in/out end C1 of the first transistor Q1 connects the cathode terminal of diode D1 via current-limiting resistance R3, the defeated in/out end E1 of the first transistor Q1 connects the input T11 of the first light emitting module 12, and the controlled end B1 connection control unit 104 of the first transistor Q1.Simultaneously, the defeated in/out end C2 of the Q2 of transistor seconds connects the output T22 of the second light emitting module 14 via current-limiting resistance R2, the output T22 of the second light emitting module 14 connects earth terminal Gnd and rectification unit 11 via current-limiting resistance R1, the defeated in/out end E2 of the Q2 of transistor seconds connects the anode tap of diode D1, the controlled end B2 connection control unit 104 of the Q2 of transistor seconds.
The current-limiting circuit of the present embodiment is connect and is formed by current-limiting resistance R1, R2, R3 connection in series-parallel, but this kind of mode is not unique current-limiting circuit, the every circuit that can control according to input power Vbr the electric current that flows through light emitting module is all the scope that the present invention advocates right.
Referring again to Fig. 3.Control unit 104 comprises a bleeder circuit 1042 and one drive circuit 1044.Bleeder circuit 1042 is connected in rectification unit 11, and it sets up an input voltage ratio value VR according to input power Vbr, and voltage swing and the input power Vbr of this input voltage ratio value VR are proportional.The bleeder circuit 1042 of the present embodiment is composed in series by resistance R 12, R13, but this kind of mode is not unique bleeder circuit, and the every bleeder circuit that can set up according to input power Vbr input voltage ratio value VR is all the scope that the present invention advocates right.
The drive circuit 1044 of the present embodiment comprises two transistor Q3, Q4, so this kind of circuit is not unique drive circuit, every can be according to the comparative result between input voltage ratio value VR and set point Vth, the circuit that is driven the first transistor Q1 and transistor seconds Q2 is all the scope that the present invention advocates right.
With reference to figure 3 and Fig. 4.Fig. 4 is the circuit waveform schematic diagram of Fig. 3.Control unit 104 receives input power Vbr from rectification unit 11, and sets up input voltage ratio value VR in the resistance R 13 of bleeder circuit 1042.When input power Vbr during when T1, even be based upon the set point Vth (meaning is that input power Vbr is less than reference value Vref) that input voltage ratio value VR in resistance R 13 is less than transistor Q4.T1 during this period, the resistance voltage VR12 being based upon on bleeder circuit 1042 can make transistor Q3 conducting, enter conducting (turn on) state to control the first transistor Q1 and transistor seconds Q2, and then allow the first light emitting module 12 be electrically connected at rectification unit 11 in parallel with the second light emitting module 14 to form the first connecting state.Now, the electric current I 1 that flows through respectively the first light emitting module 12 and the second light emitting module 14 as shown in Figure 4.
In addition, during T2, be based upon input voltage ratio value VR in resistance R 13 is greater than transistor Q4 set point Vth (meaning is that input power Vbr is greater than reference value Vref) along with the increase of input power Vbr voltage.T2 during this period, transistor Q4 enters conducting, to make transistor Q3 enter cut-off.The transistor Q3 of cut-off controls the first transistor Q1 and transistor seconds Q2 enters cut-off (turn off) state, and then allows the first light emitting module 12 connect and to be electrically connected at rectification unit 11 to form the second connecting state with the second light emitting module 14.Now, the electric current I 2 that flows through the first light emitting module 12 and the second light emitting module 14 as shown in Figure 4.
In other words, control unit 104 is control switch unit 102 under lower input power Vbr, to make the first light emitting module 12 and the second light emitting module 14 be connected in parallel, and then allow lower input power Vbr power to the first light emitting module 12 and second light emitting module 14 of parallel connection.Because the first light emitting module 12 and second light emitting module 14 of parallel connection have lower conducting voltage, therefore, lower input power Vbr can allow the first light emitting module 12 and the second light emitting module 14 in parallel move with generation current I1.In addition, control unit 104 is control switch unit 102 under higher input power Vbr, to make the first light emitting module 12 and the second light emitting module 14 be connected in series, and then allow higher input power Vbr power to the first light emitting module 12 and second light emitting module 14 of series connection.Because the first light emitting module 12 and second light emitting module 14 of series connection have higher conducting voltage, therefore, higher input power Vbr can allow the first light emitting module 12 and second light emitting module 14 of series connection move with generation current I2.
So, utilize lower input power Vbr to power to the first light emitting module 12 and second light emitting module 14 of parallel connection, and higher input power Vbr powers to the first light emitting module 12 of series connection and the mode of the second light emitting module 14, try to achieve under a fixing average current, can reduce the current peak that every voltage cycle flows through the first light emitting module 12 and the second light emitting module 14, and then reach the effect of high-luminous-efficiency and long service life.
Referring again to Fig. 3 and Fig. 4.Input power Vbr (or input voltage ratio value VR) is the power supply after sinusoidal wave alternating current AC rectification, its voltage waveform is taking 90 degree as symmetrical increase and decrease, therefore, control unit 104 during T3, T4 to the action control of transistor Q3, Q4 corresponding and be same as during T2, T1, as shown in Figure 4.
In sum, control unit 104 can be followed the voltage swing of input power Vbr, in a voltage cycle, allow connection relationship between the first light emitting module 12, the second light emitting module 14 and rectification unit 11 sequentially do action between the first connecting state, the second connecting state, the first connecting state.So, under the type of drive of fixing average current, the control mode of control unit 104, can reduce the current peak (as electric current I 2) that every voltage cycle flows through the first light emitting module 12, the second light emitting module 14, and then improve luminous efficiency and the useful life of lighting device 1 entirety.
With reference to figure 5.Fig. 5 is the circuit diagram of second embodiment of the invention.Difference main between the lighting device 2 of the present embodiment and the lighting device 1 of Fig. 3 is control module 20.The control module 20 of lighting device 2 comprises a switch element 202 and a control unit 204.Switch element 202 is a transistor Q3, and wherein the defeated in/out end C3 of transistor Q3 connects the output T12 of the first light emitting module 12 and the input T21 of the second light emitting module 14 via current-limiting resistance R2.The defeated in/out end E3 of transistor Q3 is connected in earth terminal Gnd, and the output T22 of the second light emitting module 14 is connected in earth terminal Gnd via current-limiting resistance R1, the controlled end B3 connection control unit 204 of transistor Q3.
Referring again to Fig. 5.Control unit 204 comprises a bleeder circuit 2042 and one drive circuit 2044, and wherein bleeder circuit 2042 is identical with the bleeder circuit 1042 of Fig. 3, does not repeat them here.In addition, the drive circuit 2044 of the present embodiment comprises a transistor Q4, it is according to the comparative result between input voltage ratio value VR and set point Vth, with driving transistors Q3, and then make the first light emitting module 12, the second light emitting module 14 and rectification unit 11 form the first connecting state or the second connecting state.
So, control unit 204 receives input power Vbr from rectification unit 11, and sets up input voltage ratio value VR in the resistance R 13 of bleeder circuit 2042.During even input voltage ratio value VR is less than the set point Vth of transistor Q4, being based upon resistance voltage VR12 on bleeder circuit 2042 can a shilling transistor Q3 conducting, so allow the first light emitting module 12 independent be electrically connected at rectification unit 11 and the second light emitting module 14 cuts off rectification unit 11 to form the first connecting state.
In addition, at input voltage ratio value VR along with the increase of input power Vbr voltage during being greater than the set point Vth of transistor Q4.Transistor Q4 enters conducting, to make transistor Q3 cut-off, and then allows the first light emitting module 12 connect and to be electrically connected at rectification unit 11 to form the second connecting state with the second light emitting module 14.
In other words, control unit 204 is control switch unit 202 under lower input power Vbr, to make the independent series connection of the first light emitting module 12 be electrically connected at rectification unit 11, and then allows lower input power Vbr power to the first light emitting module 12.Because the first independent light emitting module 12 has lower conducting voltage, therefore, lower input power Vbr can allow the first independent light emitting module 12 move in advance.In addition, control unit 204 is control switch unit 202 under higher input power Vbr, to make the first light emitting module 12 and the second light emitting module 14 be connected in series, and then allow higher input power Vbr power to the first light emitting module 12 and second light emitting module 14 of series connection.Because the first light emitting module 12 and second light emitting module 14 of series connection have higher conducting voltage, therefore, higher input power Vbr can allow the first light emitting module 12 and second light emitting module 14 of series connection move.
So, utilize lower input power Vbr to power to the first independent light emitting module 12, and higher input power Vbr powers to the first light emitting module 12 of series connection and the mode of the second light emitting module 14, can reduce the current peak that every voltage cycle flows through the first light emitting module 12 and the second light emitting module 14, and then reach the effect of high-luminous-efficiency and long service life.
In sum, control unit 204 can be followed the voltage swing of input power Vbr, in a voltage cycle, allow connection relationship between the first light emitting module 12, the second light emitting module 14 and rectification unit 11 sequentially do action between the first connecting state, the second connecting state, the first connecting state.So, under the type of drive of fixing average current, the control mode of control unit 204, can reduce every voltage cycle and flow through the current peak of the first light emitting module 12, the second light emitting module 14 and then luminous efficiency and the useful life of improving lighting device 2 entirety.
Coordinate Fig. 3, please refer to Fig. 6.Fig. 6 is the circuit diagram of third embodiment of the invention.Difference main between the lighting device 3 of the present embodiment and the lighting device 1 of Fig. 3 is, the lighting device 3 of the present embodiment more comprises a power back-off module 16.Power back-off module 16 is coupled to rectification unit 11, control module 10, the first light emitting module 12 and the second light emitting module 14, and it is according to the voltage swing of input power Vbr, and the total current ILED of the first light emitting module 12 and the second light emitting module 14 is flow through in corresponding adjustment.In other words, power back-off module 16 is along with the voltage swing of input power Vbr, so that the total current ILED that flows through the first light emitting module 12 and the second light emitting module 14 is compensated, to make under specified alternating current AC scope, allow input power maintain in a rated range.
In aforementioned, lighting device 3, by the compensating action of power back-off module 16 to electric current, can effectively suppress to flow through the current peak of the first light emitting module 12 and the second light emitting module 14.Compared to Fig. 4, as shown in Figure 7, during T1 to flow through electric current I 1 peak value of the first light emitting module 12 and the second light emitting module 14 comparatively smooth.In addition, during T2, electric current I 2 peak values that flow through the first light emitting module 12 and the second light emitting module 14 are also comparatively smooth.
It is worth mentioning that, power back-off module 16 does not need the control module 10 of arranging in pairs or groups, also can be independent couple and form a kind of lighting device (do not indicate) with rectification unit 11, the first light emitting module 12 and the second light emitting module 14, using the current compensation as this kind of lighting device, make the input power of this kind of lighting device can maintain in a rated range.
Power back-off module 16 comprises a Voltage-controlled Current Source 162 and a constant current source 164.Voltage-controlled Current Source 162 is coupled to rectification unit 11, according to the voltage swing of input power Vbr, and corresponding output one offset current Ibr.For instance, the voltage of input power Vbr is larger, and it is large that the offset current Ibr of corresponding output also becomes relatively, otherwise the voltage of input power Vbr is less, and the offset current Ibr of corresponding output also diminishes relatively.In aforementioned, Voltage-controlled Current Source 162 comprises resistance R 1, R2 and Zener diode ZD1, and it utilizes front end sampling mode to obtain the voltage swing of input power Vbr, then according to the voltage swing of input power Vbr, corresponding output offset current Ibr, using the compensation as total current ILED.
In addition, constant current source 164 couples Voltage-controlled Current Source 162, control module 10, the first light emitting module 12 and the second light emitting module 14, it receives offset current Ibr from Voltage-controlled Current Source 162, and according to the size of offset current Ibr, adjusted the total current ILED that flows through the first light emitting module 12 and the second light emitting module 14.For instance, offset current Ibr is larger, flows through relative the diminishing of total current ILED of the first light emitting module 12 and the second light emitting module 14, otherwise, offset current Ibr is less, flows through the first light emitting module 12 large with the relative change of total current ILED of the second light emitting module 14.
In sum, power back-off module 16 obtains the voltage of input power Vbr, and follow the voltage swing of input power Vbr, cross the total current ILED of the first light emitting module 12 and the second light emitting module 14 with corresponding flow compensated, and then allow within total current ILED can maintain rated range.
So, the lighting device 3 of the present embodiment can utilize the compensation of power back-off module 16 as total current ILED, allow total current ILED be unlikely to be subject to unsettled input power Vbr impact, and then input power can be maintained in rated range, solved the impact that the first light emitting module 12 and the second light emitting module 14 be subject to unsettled alternating current AC and caused the problem of damaging with light decay.
Referring again to Fig. 6.Constant current source 164 comprises transistor Q5, Q6, resistance R 4, R5, R6.Resistance R 4 is coupled to input power Vbr, and the drive current of transistor Q5 bias current and transistor Q6 is provided, and the controlled end B6 of transistor Q6 is controlled by transistor Q5.The electric current I D that now flows through resistance R 6 is about total current ILED, and the voltage VR6 that electric current I D sets up in resistance R 6, to allow transistor Q5 be operated in active region (active region).So, the transistor Q5 that is connected in the controlled end B6 of transistor Q6 can be used for adjusting the total current ILED that flows through transistor Q6, makes it maintain a fixing current value.
In addition, the offset current Ibr that Voltage-controlled Current Source 162 is exported flow to resistance R 6 via the resistance R 5 of constant current source 164, when resistance R 5 is during much larger than resistance R 6, voltage VR6 can form the offset voltage (Offset Voltage) of Ibr × R5, can try to achieve ID × R6=VR6-Ibr × R5 according to Thevenin's theorem.So, the offset current Ibr that Voltage-controlled Current Source 162 is exported can be used as the compensation of total current ILED, make the total current ILED can be along with the corresponding variation of the voltage swing of input power Vbr, and then input power can be maintained in rated range, the impact that is subject to unsettled alternating current AC to solve the first light emitting module 12 and the second light emitting module 14 is caused the problem of damaging with light decay.
Referring again to Fig. 6.Voltage-controlled Current Source 162 also can be coupled to the output T12 of the first light emitting module 12 and the output T22 of the second light emitting module 14, and then according to the voltage difference delta V between input power Vbr and the first light emitting module 12 and the second light emitting module 14, with correspondence output offset current Ibr.Aforesaid Voltage-controlled Current Source 162 comprises resistance R 3 and Zener diode ZD2, and it utilizes rear end sampling mode to obtain voltage difference delta V, then according to the corresponding output of voltage difference delta V offset current Ibr, using the compensation as total current ILED.
For instance, form under connecting state in parallel with the second light emitting module 14 at the first light emitting module 12, voltage difference delta V approximates greatly conducting forward bias voltage drop (forward biased) V1 that input power Vbr deducts the first light emitting module 12 or conducting forward bias voltage drop (forward biased) V2 that deducts the second light emitting module 14, i.e. Δ V=Vbr-V1 or Δ V=Vbr-V2.Form and connect under connecting state with the second light emitting module 14 at the first light emitting module 12, voltage difference delta V approximates greatly the conducting forward bias voltage drop (forward biased) that input power Vbr deducts the first light emitting module 12 and the second light emitting module 14, i.e. Δ V=Vbr-(V1+V2).
Referring again to Fig. 6.Aforesaid Voltage-controlled Current Source 162 also can comprise resistance R 1～R3, Zener diode ZD1～ZD2, and it is simultaneously in conjunction with front end and rear end sampling mode, and corresponding output offset current Ibr, using the compensation as total current ILED.
Coordinate Fig. 5, please refer to Fig. 8.Fig. 8 is the circuit diagram of fourth embodiment of the invention.Difference main between the lighting device 4 of the present embodiment and the lighting device 2 of Fig. 5 is, the lighting device 4 of the present embodiment more comprises a power back-off module 46.Power back-off module 46 is coupled to rectification unit 11, control module 20, the first light emitting module 12 and the second light emitting module 14, and it is according to the voltage swing of input power Vbr, and the total current ILED of the first light emitting module 12 and the second light emitting module 14 is flow through in corresponding adjustment.In aforementioned, the enforcement of power back-off module 46 is identical with the power back-off module 16 shown in Fig. 6, does not repeat them here.
With reference to figure 9.Fig. 9 is the circuit diagram of fifth embodiment of the invention.Lighting device 5 comprises a control module 50 and multiple light emitting modules 52, and multiple light emitting modules 52 comprise four light emitting module 52A, 52B, 52C, 52D, so not as limit.Control module 50 couples rectification unit 51 and multiple light emitting modules 52, and wherein control module 50 receives input power Vbr from rectification unit 51.
The input power Vbr of control unit 501 in control module 50 after according to alternating current AC rectification, corresponding control switch (S_H1～S_H3, S_L1～S_L3, S_M1～S_M3), to change the relation linking between multiple light emitting modules 52 and rectification unit 51, and then reduce every voltage cycle and flow through the current peak of light emitting module 52, reach lighting device 5 and have the effect of high-luminous-efficiency and long service life.
With reference to figure 9 and Figure 10.Figure 10 is the circuit waveform schematic diagram of Fig. 9.T1 during input power Vbr is less than one first set point Vref1, the controlled conducting of switch S _ H1～S_H3, S_L1～S_L3 of control module 50 inside, the controlled cut-off of switch S _ M1～S_M3, and then allow light emitting module 52A, 52B, the common parallel connection of 52C, 52D be electrically connected at rectification unit 51 to form the first connecting state.Now, the electric current I 11 that flows through respectively light emitting module 52A, 52B, 52C, 52D as shown in figure 10.
Then, T2 during input power Vbr is greater than the first set point Vref1 and is less than one second set point Vref2, the controlled cut-off of switch S _ H1, S_H3, S_L1, S_L3, S_M2 of control module 50 inside, switch S _ H2, S_L2, the controlled conducting of S_M1, S_M3, and then allow light emitting module 52A, 52B series connection be electrically connected at rectification unit 51 and light emitting module 52C, 52D series connection to be electrically connected at rectification unit 51 to form the second connecting state.Now, flow through respectively light emitting module 52A, 52 and the electric current I 12 of 52C, 52D as shown in figure 10.
Then, T3 during input power Vbr is greater than the second set point Vref2, the controlled cut-off of switch S _ H1, S_H3, S_L1, S_L3, S_H2, S_L2 of control module 50 inside, the controlled conducting of switch S _ M1～S_M3, and then allow light emitting module 52A, 52B, 52C, 52D be one another in series to be electrically connected at rectification unit 51 to form the 3rd connecting state.Now, the electric current I 13 that flows through light emitting module 52A, 52B, 52C, 52D as shown in figure 10.
Referring again to Figure 10 and Fig. 9.Input power Vbr is the power supply after sinusoidal wave alternating current AC rectification, its voltage waveform is taking 90 degree as symmetrical increase and decrease, therefore, control module 50 during T4, T5, T6 to the action control of inner switch S _ H1～S_H3, S_L1～S_L3, S_M1～S_M3 corresponding and be same as during T3, T2, T1, as shown in figure 10.
In sum, control module 50 can be followed the voltage swing of input power Vbr, allow connection relationship between light emitting module 52A, 52B, 52C, 52D and rectification unit 51 sequentially do action between the first connecting state, the second connecting state, the 3rd connecting state, the second connecting state, the first connecting state.So, under the type of drive of fixing average current, the control mode of control module 50, can reduce every voltage cycle and flow through the current peak of light emitting module 52A, 52B, 52C, 52D and then luminous efficiency and the useful life of improving lighting device 5 entirety.
Referring again to Fig. 9.Lighting device 5 more comprises a power back-off module 56.Power back-off module 56 is coupled to rectification unit 51, control module 50 and multiple light emitting module 52, and it is according to the voltage swing of input power Vbr, and the total current ILED of multiple light emitting modules 52 is flow through in corresponding adjustment.In aforementioned, the enforcement of power back-off module 56 is identical with the power back-off module 16 shown in Fig. 6, does not repeat them here.
The switch control time sequence that the control module 50 of fifth embodiment of the invention discloses according to Figure 10, use the connection relationship between symmetric mode control light emitting module 52A, 52B, 52C, 52D and rectification unit 51, this kind of mode is not unique sequencing control mode, and the every circuit that can control according to input power Vbr the connection relationship between light emitting module is all the scope that the present invention advocates right.
The foregoing is only embodiments of the invention, it is not in order to limit to the scope of the claims of the present invention.
Claims (17)
1. a lighting device, is characterized in that, receives an alternating current, comprising:
One first light emitting module;
One second light emitting module;
One rectification unit, changes into an input power by this alternating current; And
One control module, be coupled to this rectification unit, this first light emitting module and this second light emitting module, this control module receives this input power, and in the time that this input power is less than a reference value, control this first light emitting module, this second light emitting module and this rectification unit and form the first connecting state, or in the time that this input power is greater than this reference value, controls this first light emitting module, this second light emitting module and this rectification unit and form the second connecting state; And
One power back-off module, this power back-off module is coupled to this rectification unit, this control module, this first light emitting module and this second light emitting module, according to the corresponding output of the voltage swing of this input power one offset current, and according to the corresponding total current that flows through this first light emitting module and this second light emitting module of adjusting of this offset current;
This offset current of wherein exporting when the larger correspondence of voltage of this input power also becomes large relatively, and this offset current of exporting when the less correspondence of voltage of this input power also diminishes relatively;
Wherein, when this offset current is larger, flow through relative the diminishing of total current of this first light emitting module and this second light emitting module, and when this offset current less, flow through the relative change of total current of this first light emitting module and this second light emitting module greatly.
2. lighting device as claimed in claim 1, is characterized in that, this control module comprises:
One switch element, is coupled to this first light emitting module and this second light emitting module; And
One control unit, be coupled to this rectification unit and this switch element, this this switch element of control unit control, to make this first light emitting module, this second light emitting module and this rectification unit form the first connecting state or to make this first light emitting module, this second light emitting module and this rectification unit form the second connecting state.
3. lighting device as claimed in claim 2, it is characterized in that, this first connecting state is this first light emitting module and the state of this second light emitting module this rectification unit of electrically connect in parallel, and this second connecting state is the connect state of this rectification unit of electrically connect of this first light emitting module and this second light emitting module.
4. lighting device as claimed in claim 2, it is characterized in that, this first connecting state is this this rectification unit of the first light emitting module electrically connect, and this second light emitting module cuts off the state of this rectification unit, this second connecting state is the connect state of this rectification unit of electrically connect of this first light emitting module and this second light emitting module.
5. lighting device as claimed in claim 1, is characterized in that, this first light emitting module and this second light emitting module all comprise a light-emitting diode or multiple light-emitting diode connected to one another.
6. lighting device as claimed in claim 1, is characterized in that, this power back-off module comprises:
One Voltage-controlled Current Source, is coupled to this rectification unit, according to the voltage swing of this input power, and corresponding this offset current of output; And
One constant current source, couple this Voltage-controlled Current Source, this control module, this first light emitting module and this second light emitting module, this constant current source receives this offset current, and flows through the total current of this first light emitting module and this second light emitting module according to this offset current adjustment.
7. lighting device as claimed in claim 1, is characterized in that, this power back-off module comprises:
One Voltage-controlled Current Source, is coupled to the output of this first light emitting module and this second light emitting module, and this Voltage-controlled Current Source is according to the voltage difference between this input power and this first light emitting module and this second light emitting module, corresponding output one offset current; And
One constant current source, couple this Voltage-controlled Current Source, this control module, this first light emitting module and this second light emitting module, this constant current source receives this offset current, and flows through the total current of this first light emitting module and this second light emitting module according to this offset current adjustment.
8. lighting device as claimed in claim 2, is characterized in that, this switch element comprises:
One diode, has an anode tap and a cathode terminal, and this anode tap connects the output of this first light emitting module, and this cathode terminal connects the input of this second light emitting module;
One the first transistor, there is one first defeated in/out end, one second defeated in/out end and one first controlled end, wherein this first defeated in/out end connects the cathode terminal of this diode, and this second defeated in/out end connects the input of this first light emitting module, and this first controlled end connects this control unit; And
One transistor seconds, there is one the 3rd defeated in/out end, one the 4th defeated in/out end and one second control end, wherein the 3rd defeated in/out end connects output, an earth terminal and this rectification unit of this second light emitting module, the 4th defeated in/out end connects the anode tap of this diode, and this second controlled end connects this control unit.
9. lighting device as claimed in claim 8, is characterized in that, this control unit comprises:
One bleeder circuit, is connected in this rectification unit, sets up an input voltage ratio value according to this input power; And
One drive circuit, be coupled to this bleeder circuit, this drive circuit is in the time that this input voltage ratio value is less than a set point, control this first transistor and this transistor seconds conducting, to make this first light emitting module, this second light emitting module and rectification unit form the first connecting state, and, this drive circuit is in the time that this input voltage ratio value is greater than this set point, control this first transistor and the cut-off of this transistor seconds, to make this first light emitting module, this second light emitting module and rectification unit form the second connecting state.
10. lighting device as claimed in claim 9, it is characterized in that, this first connecting state is this first light emitting module and the state of this second light emitting module this rectification unit of electrically connect in parallel, and this second connecting state is the connect state of this rectification unit of electrically connect of this first light emitting module and this second light emitting module.
11. lighting devices as claimed in claim 2, it is characterized in that, this switch element is a transistor, it has one first defeated in/out end, one second defeated in/out end and a controlled end, wherein this first defeated in/out end connects between this first light emitting module and this second light emitting module via a current-limiting resistance, this second defeated in/out end connects an earth terminal, and this controlled end connects this control unit.
12. lighting devices as claimed in claim 11, is characterized in that, this control unit comprises:
One bleeder circuit, is connected in this rectification unit, sets up an input voltage ratio value according to this input power; And
One drive circuit, be coupled to this bleeder circuit, this drive circuit is in the time that this input voltage ratio value is less than a set point, control this transistor turns, to make this first light emitting module, this second light emitting module and this rectification unit form the first connecting state, and this drive circuit is in the time that this input voltage ratio value is greater than this set point, control this transistor cut-off, to make this first light emitting module, this second light emitting module and this rectification unit form the second connecting state.
13. lighting devices as claimed in claim 12, it is characterized in that, this first connecting state is the state that this this input power of the first light emitting module electrically connect and this second light emitting module cut off this rectification unit, and this second connecting state is the connect state of this rectification unit of electrically connect of this first light emitting module and this second light emitting module.
The control method of 14. 1 kinds of lighting devices, is characterized in that, is applicable to the control of a control module to one first light emitting module and one second light emitting module, comprising:
Obtain an input power, this input power is the power supply of alternating current after rectification;
In the time that this input power is less than a reference value, controls this first light emitting module, this second light emitting module and this input power and form the first connecting state;
In the time that this input power is greater than this reference value, controls this first light emitting module, this second light emitting module and this input power and form the second connecting state; And
According to the corresponding output of the voltage swing of this input power one offset current, and according to the corresponding total current that flows through this first light emitting module and this second light emitting module of adjusting of this offset current;
This offset current of wherein exporting when the larger correspondence of voltage of this input power also becomes large relatively, and this offset current of exporting when the less correspondence of voltage of this input power also diminishes relatively;
Wherein, when this offset current is larger, flow through relative the diminishing of total current of this first light emitting module and this second light emitting module, and when this offset current less, flow through the relative change of total current of this first light emitting module and this second light emitting module greatly.
The control method of 15. lighting devices as claimed in claim 14, it is characterized in that, this first connecting state is this first light emitting module and the state of this second light emitting module this input power of electrically connect in parallel, and this second connecting state is the connect state of this input power of electrically connect of this first light emitting module and this second light emitting module.
The control method of 16. lighting devices as claimed in claim 14, it is characterized in that, this first connecting state is this this input power of the first light emitting module electrically connect, and this second light emitting module cuts off the state of this input power, this second connecting state is the connect state of this input power of electrically connect of this first light emitting module and this second light emitting module.
The control method of 17. 1 kinds of lighting devices, is characterized in that, is applicable to the control of a control module to multiple light emitting modules, comprising:
Obtain an input power, this input power is the power supply of alternating current after rectification;
In the time that this input power is less than first reference value, controls the plurality of light emitting module and form the first connecting state;
Be greater than this first reference value at this input power, and while being less than second reference value, controlling the plurality of light emitting module and form the second connecting state;
In the time that this input power is greater than this second reference value, controls the plurality of light emitting module and form the 3rd connecting state; And
According to the corresponding output of the voltage swing of this input power one offset current, and according to the corresponding total current that flows through the plurality of light emitting module of adjusting of this offset current;
This offset current of wherein exporting when the larger correspondence of voltage of this input power also becomes large relatively, and this offset current of exporting when the less correspondence of voltage of this input power also diminishes relatively;
Wherein, when this offset current is larger, the total current that flows through the plurality of light emitting module diminishes relatively, and when this offset current less, the total current that flows through the plurality of light emitting module relatively becomes large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010558931.5A CN102480820B (en) | 2010-11-22 | 2010-11-22 | Lighting device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010558931.5A CN102480820B (en) | 2010-11-22 | 2010-11-22 | Lighting device and control method thereof |
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| CN102480820A CN102480820A (en) | 2012-05-30 |
| CN102480820B true CN102480820B (en) | 2014-07-02 |
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| US7479743B2 (en) * | 2005-12-12 | 2009-01-20 | Koito Manufacturing Co., Ltd. | Vehicle lighting apparatus |
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| CN101827481A (en) * | 2009-09-29 | 2010-09-08 | 李云霄 | Alternating-current power supply LED light source drive circuit with segmented conversion input |
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| CN1717858A (en) * | 2002-12-24 | 2006-01-04 | 照明技术电子工业有限公司 | Energy saving startup circuit for power supply |
| US7479743B2 (en) * | 2005-12-12 | 2009-01-20 | Koito Manufacturing Co., Ltd. | Vehicle lighting apparatus |
| CN101707874A (en) * | 2007-03-12 | 2010-05-12 | 塞瑞斯逻辑公司 | Power control system for current regulated light sources |
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| CN102480820A (en) | 2012-05-30 |
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