CN203457364U - Driving circuit and LED illumination device with same - Google Patents
Driving circuit and LED illumination device with same Download PDFInfo
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- CN203457364U CN203457364U CN201320287073.4U CN201320287073U CN203457364U CN 203457364 U CN203457364 U CN 203457364U CN 201320287073 U CN201320287073 U CN 201320287073U CN 203457364 U CN203457364 U CN 203457364U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model relates to a driving circuit and an LED illumination device with the same. The driving circuit comprises an input module, an output module, a control module, a dimming module and a compensation module, wherein the input module at least provides input signals to the output module; the control module at least provides dimming control signals, which comprise a signal for changing the maximal connection time, to the output module; the output module at least generates first output signals and second output signals for loads according to the input signals and the dimming control signals; the dimming module provides feedback signals to the control module according to the sampling signals representing the first output signals; and the compensation module receives the second output signals and outputs compensation signals compensating the maximal connection time under different loads to the control module.
Description
Technical field
The utility model relates to a kind of drive circuit and has the LED lighting device of this drive circuit.
Background technology
Along with the develop rapidly of lighting device, the particularly development of the LED lighting device of efficient low energy, the various light fixtures of employing LED technology have been widely used in the illumination of various aspects, for example room lighting or public place in daily life.So user also improves the requirement of the electrical property of LED lighting device, mechanical performance and illuminating effect thereupon.At present, due to the requirement of market for product cost, according to phase-cut dimming principle, carry out the LED drive circuit of the PSR type of work and be used widely.
For the driver of the most of phase-cut dimming devices for LED lighting device, PWM controller does not compensate Ton turn-on time of phase control element, and it has definite Ton turn-on time.If input is large electric energy enough, PWM controller is adjusted turn-on time Ton for obtaining fixing output current according to feeding back; When lighting device is dimmed, input electric energy reduces, PWM controller can increase turn-on time Ton for keeping output current, once turn-on time, Ton is increased to maximum turn-on time, output current reduces the electric energy input with compared with little, and this causes driver along with phase-cut dimming device carries out light modulation (so-called open loop light modulation).
Although output loading changes (change of LED quantity), output voltage changes, exports energy change, the numerical value of maximum turn-on time is definite, if be connected with the LED of varying number, it has different dimming curves.For example, while connecting 5 LED, Ton turn-on time of 5 μ s is suitable for the fixed current output of 700mA; While connecting 10 LED, Ton turn-on time of 10 μ s is suitable for the fixed current output of 700mA.If when therefore connecting 5 LED and being dimmed, can there is a long period " blank angle ", output current does not change completely during this period.
In the prior art, can gather Ton turn-on time that boost voltage is adjusted drive circuit by detecting from the output of drive circuit, that is to say compensating maximum turn-on time.An embodiment of this drive circuit has been shown in Fig. 1, wherein in order to have added compensating unit to compensating turn-on time, its Vaux according to the output collection from drive circuit carries out work, and can change therefore maximum turn-on time according to output voltage.But the problem still existing is, Vaux has characterized the magnitude of voltage on capacitor C1, but itself and be inaccurately equal to the output voltage V T1C that drive circuit offers load.The reason that occurs this situation is, drive circuit can produce inevitable interference signal in light modulation process, these interference signals are for example in the moment switching on and off according to the MOS field-effect transistor Q2 of dimming control signal work, the peak voltage therefore producing on capacitor C1.This peak voltage is higher than actual output voltage V T1C, so this causes the compensation of maximum turn-on time not accurate.
Utility model content
For solving the problems of the technologies described above, the utility model provides a kind of novel drive circuit.According to the utility model, drive circuit can, to effectively adjusting turn-on time in the situation that load is different, improve the efficiency of drive circuit and improve user friendly thus.In addition, the utility model also relates to a kind of LED lighting device with above-mentioned drive circuit.
First object of the present utility model realizes by a kind of like this drive circuit, this drive circuit comprises input module, output module, control module, light-adjusting module and compensating module, described input module at least provides input signal and described control module at least to described output module, to provide dimming control signal to described output module, described dimming control signal comprises the signal that changes maximum turn-on time, described output module at least produces the first output signal and the second output signal for load according to described input signal and described dimming control signal, described light-adjusting module provides feedback signal according to the sampled signal that characterizes described the first output signal to described control module, it is characterized in that, described compensating module receives described the second output signal, described compensating module compensates the compensating signal of the described maximum turn-on time under different loads state to described control module output according to described the second output signal.
According to drive circuit of the present utility model, not only can carry out light modulation by control load, but also can realize the compensation to the maximum turn-on time of phase control element simultaneously.Therefore this drive circuit comprises for carrying out the first feedback loop of light modulation and for carrying out the second feedback loop of time bias.This drive circuit with double loop structure can be realized good light modulation and time bias effect.
In design of the present utility model, described the second output signal comprises useful signal and interference signal, wherein said useful signal characterizes the described maximum turn-on time under different loads state, and described compensating module produces described compensating signal and shunts described interference signal according to described useful signal.By the unlike signal component in the second output signal, carry out separation and process separately, can guarantee only to utilize useful signal to carry out high-precision time bias.At this, can, for example particularly preferably in the mode of ground connection, the interference signal of influence time compensation in the prior art be shunted from the second output signal.
According in a preferred design of the present utility model, interference signal is the instantaneous peak value signal that described output module causes while adjusting according to described dimming control signal, and described useful signal is actual signal.Actual signal has reacted the first output signal for load, according to actual signal, can accurately realize time bias.
Preferably, described compensating module comprises adjustment unit and trigger element, and described adjustment unit receives described the second output signal and provides described useful signal to described trigger element.Like this, by the effect between adjustment unit and trigger element, can realize the separated of useful signal and interference signal, and guarantee only to utilize useful signal to carry out time bias.
Preferably, described interference signal is by described adjustment unit ground connection.The signal flow path providing by means of adjustment unit to be grounded, for example, utilizes low ohm branch road that peak voltage is imported ground.
Preferably, described adjustment unit comprises switch module, and described interference signal is by described switch module ground connection, and wherein said switch module utilizes first node and Section Point to be connected respectively described output unit and described trigger element.Realized thus for by interference signal two branch roads separated with useful signal, that is: the interference signal from output module flows through the direct ground connection of switch module through first node, useful signal from output module passes through first node, switch module and Section Point successively, then flows in trigger element.
Preferably, switch module comprises transistor, the first resistance and the second resistance, wherein said transistorized reference electrode is connected with described output module by described the first resistance, described transistorized control electrode connects described trigger element, described transistorized work electrode ground connection, described the second resistance is connected between described control electrode and described reference electrode, and described the second resistance and described reference electrode are connected to described Section Point.
Preferably, described trigger element comprises sampling capacitor and triggers branch road, wherein said triggering branch road and the parallel connection of described sampling capacitor.Trigger branch road and produce compensating signal according to the sampled signal obtaining from sampling capacitor.
Preferably, trigger branch road and comprise the 3rd resistance and the first diode, the positive pole of wherein said the first diode connects described Section Point by described the 3rd resistance, and the negative pole of described the first diode connects described control module and ground connection on the other hand on the one hand.Described the first diode defines the flow direction of the signal of telecommunication at this place, can prevent thus may be in high potential DC power supply voltage source to dividing potential drop branch road.
Preferably, described triggering branch road connects the 4th resistance, one end ground connection and the other end of described the 4th resistance connect described control module, wherein between the negative pole of described the first diode and described the 4th resistance, have the 3rd node that is connected to described control module.The 4th resistance is used as drop-down (pull-down) resistance at this.
Preferably, output module comprises the first sub-output module that contains the first power supply and the second sub-output module that contains second source, wherein said the first sub-output module provides described the first output signal for described load, and described the second sub-output module provides described the second output signal by described first node.The first and second power supplys can integrally or individually arrange.
Preferably, described the first power supply and second source are designed to respectively the first secondary winding and the second subprime winding of described output module.The first and second power supplys have shared armature winding, and the number of turn of wherein adjusting the first secondary winding and second subprime winding can make the first output signal and the second output signal exist pro rata.
Preferably, described the second sub-output module also comprises the series arm consisting of the 5th resistance and the 6th resistance, and described series arm and described second source are connected in parallel to each other and are connected between described first node and earth potential.In the situation that select the 5th and the 6th applicable resistance, the voltage that can make to be applied on sampling capacitor equals to be applied to the operating voltage in load.
Preferably, described output module also comprises the electrical switch element that receives described dimming control signal from described control module.By means of this electrical switch element, can provide the first predetermined control signal of duty ratio to load.
Preferably, described switch element is metal-oxide-semiconductor field effect transistor, the control electrode of wherein said metal-oxide-semiconductor field effect transistor is connected with two ports of described control module respectively with reference electrode, and the work electrode of described metal-oxide-semiconductor field effect transistor is connected with the primary side of described the first power supply and described second source.Metal-oxide-semiconductor field effect transistor, as a core component of this output module, is being controlled the situation of change of the first and second output signals.
Preferably, described input module comprises rectifier stack.Can carry out preliminary treatment to the electric energy from electrical network thus, to first output signal that can realize light modulation is provided to load.
Last object of the present utility model realizes by a kind of lighting device, and this lighting device comprises a plurality of being electrically connected to each other as the LED chip of load, also comprises according to above-described drive circuit.This drive circuit allows lighting device in light modulation process, to realize the compensation to maximum turn-on time simultaneously.
Accompanying drawing explanation
Accompanying drawing forms the part of this specification, for helping further to understand the utility model.These accompanying drawings illustrate embodiment of the present utility model, and are used for illustrating principle of the present utility model together with specification.Identical parts represent with identical label in the accompanying drawings.Shown in figure:
Fig. 1 is according to the schematic diagram of the drive circuit of prior art embodiment;
Fig. 2 is the schematic block diagram according to drive circuit of the present utility model;
Fig. 3 is according to the circuit diagram of drive circuit of the present utility model embodiment;
Fig. 4 is the schematic diagram of the output parameter of drive circuit of the present utility model.
Embodiment
Fig. 2 shows according to the schematic block diagram of drive circuit 100 of the present utility model.As shown in Figure 2, this novel drive circuit 100 can module turn to a plurality of unit of realizing difference in functionality, for example: input module 10, output module 20, control module 30, compensating module 40 and light-adjusting module 50.The input signal S0 from electrical network that output module 20 receives through input module 10 inputs, and the dimming control signal S4 providing according to control module 30 produces respectively the first output signal S1 and the second output signal S2 for load.
The drive circuit 100 that carries out work according to phase-cut dimming principle not only can have the effect of light modulation, also has the effect of the maximum turn-on time that changes phase control element.According to the utility model, drive circuit 100 can be realized in light modulation process compensating maximum turn-on time.Therefore through control module 30, form respectively two feedback loops for output module 20 is affected.Between control module 30 and output module 20, exist for the first feedback branch of light modulation with for compensating the second feedback branch of maximum turn-on time.Be similar to Fig. 1, in the first feedback branch, the first output signal S1 for load that output module 20 provides provides feedback signal through light-adjusting module 50 to control module 30.
Being different from Fig. 1 part is, according to the utility model, for compensating the second feedback branch of maximum turn-on time, the second output signal S2 that compensating module 40 between output module 20 and control module 30 receives from output module 20, and according to the second output signal S2, to control module 30 outputs, compensate the compensating signal S3 of the maximum turn-on time under different loads states.Therefore control module 30 provides dimming control signal S4 according to the signal from the first feedback branch and the second feedback branch to output module 20, and this dimming control signal S4 is therefore partly for changing maximum turn-on time.
Fig. 3 shows according to the circuit diagram of drive circuit 100 of the present utility model embodiment.As shown in Figure 3, drive circuit 100 comprises the input module 10 with rectifier stack and the output module 20 with two sub-output modules, wherein the first sub-output module 21 comprises for the first power supply T1B of the first output signal S1 is provided to load, second source T1C in the second sub-output module 22 for to control module 30 power supplies, is used to compensating module 40 that the second output signal S2 is provided on the one hand on the other hand.
The second sub-output module 22 also comprises the series arm consisting of the 5th resistance R 5 and the 6th resistance R 6, and series arm and second source T1C are connected in parallel to each other and are connected between first node N1 and earth potential.
The first power supply T1B and second source T1C are preferably designed to two secondary winding in transformer.Therefore based on according to phase-cut dimming principle, the second output signal S2 comprises useful signal S21 and the interference signal S22 that characterizes the maximum turn-on time under different loads state.Output module 20 can produce instantaneous peak signal while adjusting according to dimming control signal S4, so this peak signal is far longer than the useful signal S21 of waveform stabilization as interference signal S22.Useful signal S21 is the actual signal that characterizes the first output signal S1.In the situation that compatibly select the turn ratio of the first power supply T1B and second source T1C, for example during 1:1, useful signal S21 and the first output signal S1 have identical numerical value.By interference signal S22 being isolated from useful signal S21 in compensating module 40, can realize and only utilize useful signal S21 to carry out precise time compensation.
Compensating module 40 comprises adjustment unit 41 and trigger element 42, and adjustment unit 41 is received the second output signal S2 and to trigger element 42, provided useful signal S21 by Section Point N2 by the first node N1 between the second sub-output module 22 and compensating module 40.
In the present embodiment, the switch module in adjustment unit 41 comprises transistor Q1, the first resistance R 1 and the second resistance R 2, and wherein the reference electrode of transistor Q1 is connected at first node N1 with output module 20 by described the first resistance R 1.The control electrode of transistor Q1, trigger element 42 and the second resistance R 2 are connected to each other and form Section Point N2.The work electrode ground connection of transistor Q1, the second resistance R 2 is connected between control electrode and reference electrode.When interference signal S22 flows through adjustment unit 41, transistor Q1 conducting, introduces ground by interference signal S22 by work electrode thus.
After be connected to adjustment unit 41 trigger element 42 comprise sampling capacitor C1 and trigger branch road, wherein trigger branch road and sampling capacitor C1 in parallel.Useful signal S21 is applied on sampling capacitor C1 by adjustment unit 41.When this signal is magnitude of voltage, useful signal S21 is Vaux, and it equals the voltage Vc1 on sampling capacitor C1.Trigger branch road and comprise the 3rd resistance R 3 and the first diode D6, wherein the positive pole of the first diode D6 is connected to Section Point N2 by the 3rd resistance R 3, and the negative pole of the first diode D6 is link control module 30 and on the other hand by being designed to the 4th resistance R 4 ground connection of pull down resistor on the one hand.Between the negative pole of the first diode D6 and the 4th resistance R 4, there is the 3rd node N3 that is connected to control module 30.
In unshowned embodiment, can to drive circuit, be out of shape according to actual conditions.For example, in the situation that cancelling second subprime coil, compensating module can directly obtain from load-side the second output signal that another can characterize the first output signal, for carrying out compensation turn-on time.In addition can be in the situation that the turn ratio of the first secondary winding and second subprime winding be 1:1 yet, by compatibly selecting the size adjustment of each resistance in the second sub-output module and compensating module to be applied to the magnitude of voltage on sampling capacitor, guarantee that this employing magnitude of voltage is in full accord with the first output signal for load as much as possible.This is to realize the precondition of carrying out fine compensation turn-on time to maximum.
Fig. 4 is the schematic diagram of the output parameter of drive circuit of the present utility model, comprising current curve Ia and Ib and voltage curve VT1C and Vaux.In the drawings, flow through in the presentation graphs 3 respectively electric current of the second resistance and the electric current of introducing ground by transistor Q1 of Ia and Ib.For example, in Fig. 3, R2=70Ohm, the numerical value of Ia is 0.7V/70Ohm=10mA so.When the useful signal S21 in the second output signal S2 flows into compensating module 40, transistor Q1 turn-offs, and the numerical value of " Ib " is 0.Interference signal S22 in the second output signal S2, be that peak voltage is while flowing into compensating module 40, the numerical value of " Ia " is 10mA and transistor Q1 conducting, can make thus the peak current (i.e. " Ib ") corresponding to peak voltage flow through transistor Q1 and ground connection.In the case, effectively that useful signal S21 is separated with interference signal S22.When being 1:1, the turn ratio of the first power supply T1B and second source T1C draws: Vaux=VT1C=Vout.Once Vaux=Vout, just can be according to the first output signal for load, in this case Vout is to compensating maximum turn-on time.For example, when the quantity of the LED chip as load increases, compensated for larger maximum turn-on time.
Owing to comprising the compensating module that can eliminate the interference signal in the second output signal according to drive circuit of the present utility model, so the VT1C shown in figure and Vaux overlap substantially, guarantees thus to realize the fine compensation to maximum turn-on time.Owing to can change maximum turn-on time according to the utility model, so drive circuit is being connected with in unequally loaded situation, also can in light modulation process, obtain desirable dimming curve.
These are only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All any modifications of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model within spirit of the present utility model and principle.
Reference number
10 input modules
20 output modules
21 first sub-output modules
22 second sub-output modules
30 control modules
40 compensating modules
41 adjustment units
42 trigger elements
50 light-adjusting modules
100 drive circuits
D6 the first diode
C1 sampling capacitor
N1 first node
N2 Section Point
N3 the 3rd node
Q1 transistor
Q2 electrical switch element
R1 the first resistance
R2 the second resistance
R3 the 3rd resistance
R4 the 4th resistance
R5 the 5th resistance
R6 the 6th resistance
S0 input signal
S1 the first output signal
S2 the second output signal
S21 useful signal
S22 interference signal
S3 compensating signal
S4 dimming control signal
T1B the first power supply
T1C second source
Claims (16)
1. a drive circuit (100), comprise: input module (10), output module (20), control module (30), light-adjusting module (50) and compensating module (40), described input module (10) at least provides input signal (S0) and described control module (30) at least to described output module (20), to provide dimming control signal (S4) to described output module (20), described dimming control signal (S4) comprises the signal that changes maximum turn-on time, described output module (20) at least produces the first output signal (S1) and the second output signal (S2) for load according to described input signal (S0) and described dimming control signal (S4), described light-adjusting module (50) provides feedback signal according to the sampled signal that characterizes described the first output signal (S1) to described control module (30), it is characterized in that, described compensating module (40) receives described the second output signal (S2), described compensating module (40) compensates the compensating signal (S3) of the described maximum turn-on time under different loads state to described control module (30) output according to described the second output signal (S2).
2. drive circuit according to claim 1 (100), it is characterized in that, described the second output signal (S2) comprises useful signal (S21) and interference signal (S22), wherein said useful signal (S21) characterizes the described maximum turn-on time under different loads state, and described compensating module (40) produces described compensating signal (S3) and shunts described interference signal (S22) according to described useful signal (S21).
3. drive circuit according to claim 2 (100), it is characterized in that, described interference signal (S22) is the instantaneous peak value signal that described output module (20) causes while adjusting according to described dimming control signal (S4), and described useful signal (S21) is actual signal.
4. according to the drive circuit described in claim 2 or 3 (100), it is characterized in that, described compensating module (40) comprises adjustment unit (41) and trigger element (42), and described adjustment unit (41) receives described the second output signal (S2) and provides described useful signal (S21) to described trigger element (42).
5. drive circuit according to claim 4 (100), is characterized in that, described interference signal (S22) is by described adjustment unit (41) ground connection.
6. drive circuit according to claim 5 (100), it is characterized in that, described adjustment unit (41) comprises switch module, described interference signal (S22) is by described switch module ground connection, and wherein said switch module utilizes first node (N1) and Section Point (N2) to be connected respectively described output module (20) and described trigger element (42).
7. drive circuit according to claim 6 (100), it is characterized in that, described switch module comprises transistor (Q1), the first resistance (R1) and the second resistance (R2), the reference electrode of wherein said transistor (Q1) is connected with described output module (20) by described the first resistance (R1), the control electrode of described transistor (Q1) connects described trigger element (42), the work electrode ground connection of described transistor (Q1), described the second resistance (R2) is connected between described control electrode and described reference electrode, described the second resistance (R2) and described control electrode are connected to described Section Point (N2).
8. drive circuit according to claim 6 (100), is characterized in that, described trigger element (42) comprises sampling capacitor (C1) and triggers branch road, wherein said triggering branch road and described sampling capacitor (C1) parallel connection.
9. drive circuit according to claim 8 (100), it is characterized in that, described triggering branch road comprises the 3rd resistance (R3) and the first diode (D6), the positive pole of wherein said the first diode (D6) connects described Section Point (N2) by described the 3rd resistance (R3), and the negative pole of described the first diode (D6) connects described control module (30) and ground connection on the other hand on the one hand.
10. drive circuit according to claim 9 (100), it is characterized in that, described triggering branch road connects the 4th resistance (R4), one end ground connection of described the 4th resistance (R4) and the other end connect described control module (30), wherein between the negative pole of described the first diode (D6) and described the 4th resistance (R4), have the 3rd node (N3) that is connected to described control module (30).
11. drive circuits according to claim 6 (100), it is characterized in that, described output module (20) comprises the first sub-output module (21) that contains the first power supply (T1B) and the second sub-output module (22) that contains second source (T1C), wherein said the first sub-output module (21) provides described the first output signal (S1) for described load, and described the second sub-output module (22) provides described the second output signal (S2) by described first node (N1).
12. drive circuits according to claim 11 (100), is characterized in that, described the first power supply (T1B) and second source (T1C) are designed to respectively the first secondary winding and the second subprime winding of described output module (20).
13. drive circuits according to claim 11 (100), it is characterized in that, described the second sub-output module (22) also comprises the series arm consisting of the 5th resistance (R5) and the 6th resistance (R6), and described series arm and described second source (T1C) are connected in parallel to each other and are connected between described first node (N1) and earth potential.
14. drive circuits according to claim 11 (100), is characterized in that, described output module (20) also comprises the electrical switch element (Q2) that receives described dimming control signal (S4) from described control module (30).
15. drive circuits according to claim 14 (100), it is characterized in that, described switch element (Q2) is metal-oxide-semiconductor field effect transistor, the control electrode of wherein said metal-oxide-semiconductor field effect transistor is connected with two ports of described control module (30) respectively with reference electrode, and the work electrode of described metal-oxide-semiconductor field effect transistor is connected with the primary side of described second source (T1C) with described the first power supply (T1B).
16. 1 kinds of LED lighting devices, comprise a plurality of being electrically connected to each other as the LED chip of load, it is characterized in that, also comprise according to drive circuit (100) described in any one in claim 1-15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320287073.4U CN203457364U (en) | 2013-05-23 | 2013-05-23 | Driving circuit and LED illumination device with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320287073.4U CN203457364U (en) | 2013-05-23 | 2013-05-23 | Driving circuit and LED illumination device with same |
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| Publication Number | Publication Date |
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| CN203457364U true CN203457364U (en) | 2014-02-26 |
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| CN201320287073.4U Expired - Fee Related CN203457364U (en) | 2013-05-23 | 2013-05-23 | Driving circuit and LED illumination device with same |
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