CN103108435A - Damping circuit, light-emitting diode (LED) driver and LED lighting system - Google Patents
Damping circuit, light-emitting diode (LED) driver and LED lighting system Download PDFInfo
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- CN103108435A CN103108435A CN2011103594811A CN201110359481A CN103108435A CN 103108435 A CN103108435 A CN 103108435A CN 2011103594811 A CN2011103594811 A CN 2011103594811A CN 201110359481 A CN201110359481 A CN 201110359481A CN 103108435 A CN103108435 A CN 103108435A
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- 238000001514 detection method Methods 0.000 claims abstract description 62
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- 239000003990 capacitor Substances 0.000 abstract description 16
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention relates to a damping circuit used for a driver and for restraining flickering. The damping circuit comprises a first subcircuit and at least one damping element, wherein the first subcircuit is composed of a first capacitor and a first resistor which are in serial connection, and the first subcircuit is connected with an input voltage end. The damping circuit further comprises an identification control circuit comprising a detection module and a switch module, wherein the detection module collects at least one detection signal to produce a first control signal and a second control signal or to produce a third control signal or a fourth control signal, the representation of the at least one detection signal comes from voltage changes of the input voltage end, the first control signal is used for identifying that the front of the driver is not connected with a light modulator, the second control signal is used for identifying that the front of the driver is connected with the light modulator, the third control signal is used for identifying that the front of the driver is connected with a light modulator achieving a preset measurement, and the fourth control signal is used for identifying that the front of the driver is connected with the light modulator which does not achieve a preset measurement; and the switch module controls a working state of the damping element according to the first control signal or the third control signal and according to the second control signal or the fourth control signal. The damping circuit has the advantages of high generality, efficiency and energy conservation.
Description
Technical field
The present invention relates to a kind of antihunt circuit, LED driver and LED illuminator.
Background technology
In the lighting device in modern times, particularly in the LED lighting device, in order to obtain to be applicable to the brightness of different lighting environments, propose to have the improvement design of dimming function.The LED lighting device of installation dimmer of the prior art generally includes dimmer 1 and LED driver 100 and load LED8, and this LED driver 100 comprises rectifying device 9, antihunt circuit 10, power converter 7, as shown in Figure 1.This antihunt circuit 10 generally includes capacitor C 1, resistance R 1 and powerful damping element R ' for example.The reason that antihunt circuit 10 is set is, carries out light modulation work on LED driver and can cause the flicker of LED constantly when dimmer is connected to, and antihunt circuit need to additionally be set usually for avoiding glimmering be used for flicker is suppressed.In this antihunt circuit, principal current is through higher high-power damping element R ' or other the damping element of resistance.But, because damping element R ' has consumed a lot of power, therefore cause the power of LED driver to reduce.For example usually for the driver of 15W, the effect loss can reach 4%.Consume in addition after the electric energy conversion on damping element R ' is heat energy, also will produce adverse influence to the life-span of the electronic component of LED driver.
In order to improve the power of LED driver, must reduce to consume the power on high-power damping resistance, therefore often use dynamic switch.The shortcoming of this method is, whether applied dynamic switch can not identify driver and link together with dimmer, be the operating state of None-identified dimmer.Consequent consequence is: when driver is not connected with dimmer or dimmer not during conducting, during R ' is still in running order and and then affect the power output of the driver of lighting device.
Summary of the invention
Therefore the object of the invention is to, propose a kind of antihunt circuit for LED driver, this antihunt circuit can according to different actual needs, provide higher power output, reduce to consume the power loss on damping device in non-light modulation process, have stronger versatility.
according to the present invention proposes a kind of antihunt circuit for driver, be used for suppressing flicker, comprise: by the first electric capacity that is one another in series, the first branch road that the first resistance consists of and at least one damping element, the first branch road connects Input voltage terminal, it is characterized in that, also comprise recognition control circuit, recognition control circuit comprises measuring ability module and switching function module, at least one detection signal that the collection of measuring ability module characterizes the change in voltage that comes from Input voltage terminal is not connected with the first control signal of dimmer and before is connected to the second control signal of dimmer before producing the identification driver, perhaps produce and be connected to the 3rd control signal or the dimmer that reach the predetermined dimmer of measuring before driver and do not reach predetermined the 4th control signal of measuring, the switching function module is according to the first control signal or the 3rd control signal and the operating state of controlling damping element according to the second control signal or the 4th control signal.Dimmer reaches predetermined and measures the not on-state that for example can be understood as dimmer, and dimmer does not reach the predetermined conducting state that can be understood as dimmer of measuring.
Design starting point of the present invention is, by gathering on one's own initiative at least one detection signal that characterizes the change in voltage that comes from Input voltage terminal, identify whether had dimmer before this LED driver, and control the operating state of the damping element in antihunt circuit according to recognition result.For example by controlling the operating state of powerful damping element, can avoid powerful damping element to be in the operating state of power consumption always.For example by control example as the damping element as inductor design, the noise that brings due to inductance work when can be reduced in dimmer work.The LED driver of using such antihunt circuit both had been applicable to have the lighting circuit of dimmer, also be suitable for not having the direct illumination apparatus of dimmer to carry out the lighting circuit that state is controlled, cut before also being applicable to dimmer and after cut dimmer different situations, and can control damping device according to different applicable cases, thereby reduce as much as possible unnecessary power loss, for example driving power can be improved 2% or improve for other performance of antihunt circuit for the driver of 15W.The further improvement of the present invention point is, not only identify for having or not of dimmer, further identify for the operating state of dimmer, so that really just connect powerful damping element in the moment that causes flicker, thereby improved further energy-saving effect.
Preferred embodiment damping element is power resistor according to one of the present invention, and the switching function module is connected damping element with the damping element short circuit and according to the second control signal or the 4th control signal according to the first control signal or the 3rd control signal.Thereby improved the driving effect of antihunt circuit, reduced unnecessary power loss.
Preferred embodiment damping element is inductance according to one of the present invention, the switching function module according to the first control signal or the 3rd control signal connects damping element and according to the second control signal or the 4th control signal with the damping element short circuit.Thereby the noise that brings due to inductance work when being reduced in dimmer work.
Preferably, the measuring ability module comprises first detection module, the switching function module comprises the first switch module, to produce the first control signal and the second control signal, the first switch module is controlled the operating state of damping element to first detection module according to first, second control signal from first detection signal end collection the first detection signal between the first electric capacity and the first resistance.Can reflect well from first detection signal end collection the first detection signal between the first electric capacity and the first resistance the voltage that is applied on the first resistance and power resistor, can characterize out well the speed through the variation of the input voltage of rectification, thereby detect the connection of dimmer or do not connect.
In order to improve the versatility of antihunt circuit, to realize and before cut the coupling of dimmer, first detection module comprises the first detecting unit of cutting the first control signal and second control signal of dimmer before whether produce identification before is connected to.When preferably, the first detecting unit is cut dimmer before before not being connected to output as the low level signal of the first control signal or cut dimmer before front being connected to time output as the high level signal of the second control signal.Cut before the cut angle dimmer that adopts due to different lighting device is divided into dimmer and after cut dimmer, therefore, cut before being directed to dimmer and after cut dimmer and considered different detecting units, improved versatility.
In a specific embodiment according to the present invention, the first detecting unit comprises the first diode, the second resistance that is one another in series and the 3rd resistance and the second electric capacity, the positive pole of the first diode is connected to an end of negative pole connection second resistance of the first detection signal end and the first diode, the second electric capacity and the second resistance that is one another in series, the 3rd resistance are in parallel, be provided for the signal end with the control signal of first or second control signal input the first switch module between the second resistance and the 3rd resistance, the other end of the 3rd resistance is connected to earth potential.
When preferably, the first detecting unit is cut dimmer before front not being connected to output as the low level signal of the first control signal or cut dimmer before front being connected to time output as the high level signal of the second control signal.
According to of the present invention one preferred embodiment, the first detecting unit comprises the first diode, the second resistance that is one another in series and the 3rd resistance and the second electric capacity, the positive pole of the first diode is connected to an end of negative pole connection second resistance of the first detection signal end and the first diode, the second electric capacity and the second resistance that is one another in series, the 3rd resistance are in parallel, be provided for the signal end with first or second control signal input the first switch module control signal between the second resistance and the 3rd resistance, the other end of the second resistance is connected to earth potential.Provide at the same time cut before detection dimmer and after cut in the situation of function of dimmer, the positive pole of the first diode can indirect joint the first detection signal end.This first detecting unit has just produced the first control signal and second control signal of cutting dimmer before whether detection before is connected to exactly with less components and parts, possess with low cost, the high advantage of detection precision.
Preferably, the first switch module comprises the first switch element.The first switch element is the first transistor preferably, and damping element is connected between the work electrode and reference electrode of the first transistor, the reference electrode earthing potential of the first transistor.Utilize the first switch element to realize direct control for damping element.
According to a preferred embodiment of the present invention, the first switch module also comprises the first clamp circuit for the first transistor, and the first clamp circuit comprises control electrode and the 4th electric capacity between earth potential and/or the first voltage stabilizing didoe that is connected to the first transistor.Utilize the first clamp circuit that the control of control electrode under different situations for the first transistor can be provided.This first clamp circuit is used in the situation of the 4th electric capacity, can realize in light modulation in guaranteed output resistance still current flowing, plays certain damping action, prevents that the concussion of dimmer electric current from causing light flash.
Preferably, the first switch module also comprises the second switch element, is used for the switch of controlling the first switch element according to from the first control signal and second control signal of signal end.The application that is complementary of the second control signal of second switch element and low level the first control signal or high level.The second switch element is transistor seconds, and the control electrode connection signal end of transistor seconds and the work electrode of transistor seconds are connected to control electrode and the reference electrode earthing potential of the first transistor.
According to a preferred embodiment of the present invention, the first switch module also comprises the second clamp circuit for transistor seconds, and the second clamp circuit comprises control electrode and the 3rd electric capacity between earth potential and/or the second voltage stabilizing didoe that is connected to transistor seconds.Utilize the second clamp circuit, realization is for the control of the voltage of the control electrode of transistor seconds.
According to further preferred embodiment of the present invention, the first switch module also comprises the 3rd voltage stabilizing didoe, and an end of the 3rd voltage stabilizing didoe is connected to the control electrode of signal end and other end connection transistor seconds.Utilize the 3rd voltage stabilizing didoe, only further guarantee just might open transistor seconds in the situation that connect the 3rd voltage stabilizing didoe, thereby realized control for the voltage of the control electrode of transistor seconds.
According to a preferred embodiment of the present invention, antihunt circuit also comprises the second branch road that is connected to Input voltage terminal, the second branch road comprises the 5th resistance and the 6th resistance as divider resistance that is one another in series, and the control electrode of the first transistor is connected between the 5th resistance and the 6th resistance.By selecting the resistance of appropriate the 5th resistance and the 6th resistance, can apply stable high level voltage on the first transistor, the first control signal and the second control signal affect it afterwards.
According to a preferred embodiment of the present invention, in order to improve the versatility of antihunt circuit, realize with after cut dimmer coupling, the second detecting unit is provided, this second detecting unit comprises the 5th electric capacity, the second diode, the 5th electric capacity one end connects the first detection signal end, and the other end is connected to respectively the positive terminal of the first diode and the negative pole end of described the second diode, and the positive terminal of the second diode is connected to the other end of the 3rd resistance.Utilize the second detecting unit, in conjunction with the first detecting unit, satisfied equally for after cut the needs of dimmer.The 5th electric capacity, the second diode and the first diode are adjusted to high level with the first detection signal.
According to a preferred embodiment of the present invention, for function is controlled in the identification that improves antihunt circuit, the measuring ability module comprises the second detection module, and whether the second detection module generation identification before is connected to the 3rd control signal or the dimmer that reach the predetermined dimmer of measuring does not reach predetermined the 4th control signal of measuring.Concrete implement embodiment at one, the second detection module is the 3rd branch road that is comprised of the 7th resistance and the 8th resistance that is connected with Input voltage terminal, from exporting the 3rd control signal or the 4th control signal between the 7th resistance and the 8th resistance.Thereby directly obtain the voltage after voltage input end Voltage-output dividing potential drop.
Corresponding with the preferred embodiment, the switching function module comprises the second switch module, and the first switch module is controlled the switch of damping element according to the second control signal and second switch module according to the 3rd control signal or the 4th control signal.
In a preferred embodiment, the second switch module comprises the 3rd transistor, the 4th transistor, the 4th voltage stabilizing didoe and the 9th resistance, the 3rd transistorized work electrode is connected with the reference electrode of transistor seconds and its reference electrode connects earth potential, the 4th transistorized control electrode is connected with the 4th voltage stabilizing didoe, and its work electrode is connected with the work electrode of transistor seconds through the 9th resistance and work electrode is connected with the 3rd transistorized control electrode.Thereby sensing function and the control ability of antihunt circuit have further been improved, the light efficiency of the LED driver under having improved.
The present invention also relates to a kind of driver and illuminator simultaneously.
Should be appreciated that, above generality is described and the following detailed description is all enumerated and illustrative, and purpose is for to the claimed further instruction that the invention provides.
Description of drawings
Accompanying drawing consists of the part of this specification, is used for helping further to understand the present invention.These accompanying drawings illustrate embodiments of the invention, and are used for illustrating principle of the present invention together with specification.Identical parts represent with identical label in the accompanying drawings.Shown in figure:
Fig. 1 is according to the dimmer of prior art and the layout of LED driver;
Fig. 2 a is the antihunt circuit according to the first specific embodiment of the present invention;
Fig. 2 b is another embodiment that uses according to the antihunt circuit of the first specific embodiment of the present invention;
Fig. 3 a-3b, Fig. 4 a-4b respectively according to cut before in the first specific embodiment of the present invention dimmer, after cut the voltage waveform view of the control electrode of the unrectified input voltage waveform of dimmer and corresponding the first transistor.
Fig. 5 is the antihunt circuit according to the second specific embodiment of the present invention;
Fig. 6 a is the voltage oscillogram of the Input voltage terminal after rectification when cutting dimmer in the antihunt circuit of first, second specific embodiment of the present invention before connection, the voltage oscillogram of the first detection signal end and the current waveform figure that flows into damping element this moment;
Fig. 6 b is the comparison of wave shape figure when cutting dimmer before cutting dimmer and be connected before not connecting according to the voltage of the Input voltage terminal after rectification in the antihunt circuit of first, second specific embodiment of the present invention;
Fig. 6 c is the comparison of wave shape figure of voltage of the control electrode of the first transistor when cutting dimmer before cutting dimmer and be connected in the antihunt circuit of first, second specific embodiment of the present invention before not connecting;
Fig. 7 is the antihunt circuit according to the 3rd specific embodiment of the present invention.
Embodiment
Fig. 2 a is the antihunt circuit 10 according to the first specific embodiment of the present invention.Antihunt circuit 10 according to the present invention has the first capacitor C 1, the first resistance R 1 and is mainly used in playing the damping element powerful element in other words that suppresses flicker, and for example in this specific embodiment, this powerful damping element is power resistor.For example it is pointed out that the first capacitor C 1, the first resistance R 1 and power resistor have the same with antihunt circuit of the prior art, its effect is mainly to suppress flicker.
According to the first specific embodiment of the present invention, antihunt circuit 10 of the present invention also comprises recognition control circuit, after increasing this recognition control circuit, the respective control function that antihunt circuit 10 of the present invention has had the dimmer recognition function and carried out according to the dimmer recognition function.For example, can the power ratio control resistive short when antihunt circuit 10 is not connected with dimmer before identifying driver, and can connect by power ratio control resistance when being connected with dimmer before identifying driver, thereby realize good energy-saving effect.Certainly in other embodiments shown in (for example Fig. 2 b), antihunt circuit 10 also can be controlled other damping element and for example control inductance L 2, can control inductance L 2 accesses when not being connected with dimmer before identifying driver, to improve EMI and PF performance, and when being connected with dimmer before identifying driver, can control inductance L 2 short circuits, to reduce the noise that is brought due to inductance L 2 work.
The recognition control circuit of antihunt circuit 10 of the present invention comprises measuring ability module and switching function module, be not connected with the first control signal S1 of dimmer 1 and before be connected to the second control signal S2 of dimmer 1 before producing identification driver 100, antihunt circuit 10 comprises first detection module 4, and the switching function module comprises the first switch module 5.1.First detection module 4 gathers at least one detection signal that characterizes the change in voltage that comes from Input voltage terminal Vin_DC and is not connected with the first control signal S1 of dimmer 1 and before is connected to the second control signal S2 of dimmer 1 before producing identification driver 100.In this specific embodiment, first detection module 4 gathers the first detection signal from the first detection signal end V_Detector1 between the first capacitor C 1 and the first resistance R 1 and produces the first control signal S1 and the second control signal S2.
In order to increase the versatility of antihunt circuit 10 of the present invention, first detection module 4 comprises before whether produce identification before is connected to cuts the first control signal S1 of dimmer and the first detecting unit 4.1 of the second control signal S2.as shown in Fig. 2 a, the first detecting unit 4.1 comprises the first diode D1, the second resistance R 2 that is one another in series and the 3rd resistance R 3, and second capacitor C 2, the positive pole of the first diode D1 is connected to an end of negative pole connection the second resistance R 2 of the first detection signal end V_Detector1 and the first diode D1, the second capacitor C 2 and the second resistance R 2 that is one another in series, the 3rd resistance R 3 parallel connections, be provided for the first or second control signal S1 between the second resistance R 2 and the 3rd resistance R 3, the signal end V_out of the control signal of S2 input the first switch module 5.1, the 3rd resistance R 3 other ends are connected to earth potential.The first diode D1, the second resistance R 2 that is one another in series and the 3rd resistance R 3 and the second capacitor C 2 have consisted of the first detecting unit 4.1.
For according to the first or second control signal S1, S2 carries out control procedure, the first switch module 5.1 is set, this first switch module 5.1 comprises the first switch element, the first switch element is the first transistor Q1, damping element R ' is connected between the work electrode and reference electrode of the first transistor Q1, the reference electrode earthing potential of the first transistor Q1.The first switch module 5.1 also comprises the second switch element, is used for the switch of controlling the first switch element Q1 according to the first control signal S1 and the second control signal S2 from signal end V_out.The second switch element is transistor seconds Q2, and the control electrode connection signal end V_out of transistor seconds Q2 and the work electrode of transistor seconds Q2 are connected to control electrode and the reference electrode earthing potential of the first transistor Q1.In this specific embodiment, the first switch module 5.1 also comprises the first clamp circuit for the first transistor Q1, the first clamp circuit comprises control electrode and the 4th capacitor C 4 between earth potential and/or the first voltage stabilizing didoe D1 ' that is connected to the first transistor Q1, is used for the voltage levvl of the control electrode of control the first transistor Q1.
According to this specific embodiment, (Fig. 3 a) is converted to unidirectional sinusoidal voltage (curve 1 ' in Fig. 6 a) to the sine voltage of Symmetrical after rectifying device 9 (rectifier bridge) is adjusted, so in this embodiment, the speed of the change in voltage of detection Input voltage terminal Vin_DC is the magnitude of voltage V of the first detection signal end V_Detector1 of degree in other words
R1, R '=C1 (R1+R ') dv/dt.
In conjunction with Fig. 6 a, can know, in the situation that cut dimmer 1 before increase, according to being unidirectional sinusoidal voltage (as shown in the curve 1 ' in Fig. 6 a take the curve 5 ' of 90 °, angle of cut as example and Fig. 6 b) through the voltage oscillogram of the Input voltage terminal Vin_DC after rectification when cutting dimmer 1 before connection in antihunt circuit 10 of the present invention.Through above-mentioned formula V
R1, R 'After=C1 (R1+R ') dv/dt converts, can find out that the voltage oscillogram of the first detection signal end V_Detector1 is for as shown in the curve 3 ' in Fig. 6 a.Therefore, utilize the first detecting unit 4.1, generation acts on the high potential signal on transistor seconds Q2, make transistor seconds Q2 conducting, due to transistor seconds Q2 conducting, the lower voltage of the control electrode of the first transistor Q1 is to electronegative potential (with reference to the voltage oscillogram of the control electrode of the first transistor Q1 of demonstration on Fig. 3 b, referring to the curve 7 ' in Fig. 6 c).At this moment, the first transistor Q1 disconnects, and the electric current that therefore has the current waveform as shown in the curve 11 ' in Fig. 6 a flows through power resistor R '.If do not cut in the situation of dimmer 1 before or not connecing, at this moment, the voltage waveform of Input voltage terminal Vin_DC is as shown in curve 4 ' in Fig. 6 b, this moment is due to the voltage that is applied on the first resistance R 1 and power resistor R ', namely the voltage on the first detection signal end V_Detector1 is very low, because produce low-down dv/dt value.like this through after voltage detecting and dividing potential drop, level on the 3rd resistance R 3 in the first detecting unit 4.1 is lower, be not enough to open transistor seconds Q2, because the first transistor Q1 is subject to the first clamp circuit (can consider by consisting of one of in the 4th capacitor C 4 and the first voltage stabilizing didoe D1 ' or both) and is subject to resistance R 5 on the second branch road 12, the control of R6, therefore by choosing appropriate divider resistance R5, the resistance value of R6, can apply stable high level voltage (referring to the curve 6 ' in Fig. 6 c) on the first transistor Q1, therefore, the first transistor Q1 conducting, power resistor R ' is by short circuit.
In order further to increase the versatility of antihunt circuit 10 of the present invention, first detection module 4 comprises after whether produce identification together with the first detecting unit 4.1 before is connected to cuts the first control signal S1 of dimmer and the second detecting unit 4.2 of the second control signal S2.The second detecting unit 4.2 comprises the 5th capacitor C 5, the second diode D2, the 5th capacitor C 5 one ends connect the first detection signal end V_Detector1, the other end is connected to respectively the positive terminal of the first diode D1 and the negative pole end of the second diode D2, and the positive terminal of the second diode D2 is connected to the other end of the 3rd resistance R 3.At this moment, when cutting dimmer after connection, after cut the Symmetrical of dimmer sine voltage (Fig. 4 a) is converted to unidirectional sinusoidal voltage after rectifying device 9 is adjusted, from the voltage signal of the first detection signal end V_Detector1 according to formula V
R1, R 'After converting ,=C1 (R1+R ') dv/dt produced the level different with before cutting dimmer, utilize the 5th capacitor C 5, the first diode D1, the second diode D2 to be adjusted to high level from the voltage signal of the first detection signal end V_Detector1 this moment, carries out corresponding control.Utilize the first detecting unit 4.1 and the second detecting unit 4.2, generation acts on the high potential signal of transistor seconds Q2, make transistor seconds Q2 conducting, due to transistor seconds Q2 conducting, the grid voltage of the first transistor Q1 is reduced to electronegative potential (with reference to the voltage oscillogram of the control electrode of the first transistor Q1 of demonstration on Fig. 4 b).At this moment, the first transistor Q1 disconnects, so electric current flows through power resistor R '.
Fig. 5 a is the antihunt circuit 10 according to the second specific embodiment of the present invention.Content in the first specific embodiment in the most content of Fig. 5 a and Fig. 2 a is identical.Different is, Fig. 5 a take detect cut before whether before being connected to dimmer 1 for example further abundant and perfect the first specific embodiment, for example in Fig. 5 a for the voltage of the control electrode of controlling further transistor seconds Q2, the first switch module 5.1 has also comprised second a voltage stabilizing didoe D2 ', be connected between the control electrode and earth potential of transistor seconds Q2, consisted of the second clamp circuit together with the 3rd capacitor C 3 between the control electrode that is connected to equally transistor seconds Q2 and earth potential.In addition, different is, the first switch module 5.1 also comprises the 3rd voltage stabilizing didoe D3 ', and the end of the 3rd voltage stabilizing didoe D3 ' is connected to the control electrode that signal end V_out and the other end connect transistor seconds Q2, with the voltage of the control electrode of further control transistor seconds Q2.For example, in the situation that do not connect dimmer 1, after voltage detecting and dividing potential drop, do not have the enough voltage can conducting the 3rd voltage stabilizing didoe D3 ' and conducting transistor seconds Q2 then.
Fig. 6 a is the voltage oscillogram of the Input voltage terminal after rectification when cutting dimmer in the antihunt circuit of first, second specific embodiment of the present invention before connection, the voltage oscillogram of the first detection signal end and the current waveform figure that flows into damping element this moment; Fig. 6 b is the comparison of wave shape figure when cutting dimmer in the antihunt circuit of first, second specific embodiment of the present invention before the voltage of the Input voltage terminal after rectification is not connecting dimmer and is being connected; Fig. 6 c is the comparison of wave shape figure of voltage of the control electrode of the first transistor when cutting dimmer in the antihunt circuit of first, second specific embodiment of the present invention before not connecting dimmer and being connected.In conjunction with the curve 1 ', 3 ' in Fig. 6 a, 11 ' and Fig. 6 b in curve 4 ', 5 ' and Fig. 6 c in curve 6 ', 7 ' can be well understood to the concrete design of the present invention's the first and second specific embodiments.
Fig. 7 is the antihunt circuit according to the 3rd specific embodiment of the present invention.Antihunt circuit 10 in Fig. 7 is further for Fig. 5, and the antihunt circuit 10 in 6 is improved.Whether before be connected to dimmer 1 except identifying, antihunt circuit 10 can also identify dimmer 1 and whether reach predetermined and measure.Reaching predetermined measuring can be for example dimmer 1 nonconducting state.Can be the conducting state of dimmer 1 and do not reach predetermined measuring.Whether for this reason, produce identification according to recognition control circuit according to the present invention before is connected to the 3rd control signal S3 or the dimmer 1 that reach the predetermined dimmer 1 of measuring and does not reach predetermined the 4th control signal S4 that measures.The switching function module is controlled the operating state of damping element R ' according to the 3rd control signal S3 or the 4th control signal S4., compare with the second specific embodiment with the first specific embodiment of the present invention, the 3rd embodiment has increased corresponding detection module and switch module for this reason.In this specific embodiment, the measuring ability module comprises also whether the second detection module 6, the second detection modules 6 generation identifications before are connected to the 3rd control signal S3 or the dimmer 1 that reach the predetermined dimmer 1 of measuring and do not reach predetermined the 4th control signal S4 that measures.In this specific embodiment, the second detection module 6 is the 3rd branch roads that are comprised of the 7th resistance R 7 and the 8th resistance R 8 that are connected with Input voltage terminal Vin_DC, from output the 3rd control signal S3 or the 4th control signal S4 between the 7th resistance R 7 and the 8th resistance R 8.Accordingly, the switching function module also comprises second switch module 5.2, this second switch module 5.2 comprises the 3rd transistor Q3, the 4th transistor Q4, the 4th voltage stabilizing didoe D4 ' and the 9th resistance R 9, the work electrode of the 3rd transistor Q3 is connected with the reference electrode of transistor seconds Q2 and its reference electrode connects earth potential, the control electrode of the 4th transistor Q4 is connected with the 4th voltage stabilizing didoe D4 ', and its work electrode is connected with the work electrode of transistor seconds Q2 through the 9th resistance R 9 and work electrode is connected with the control electrode of the 3rd transistor Q3.
Below elaborate this specific embodiment detection dimmer 1 and whether reach predetermined operation principle and the course of work of measuring.
The situation of cutting in the past dimmer illustrates, in the situation that before connect dimmer 1, comprise that the level on the 3rd resistance R 3 in the first detecting unit 4.1 of the first diode D1, the second resistance R 2 that is one another in series and the 3rd resistance R 3 and the second capacitor C 2 is higher, the 3rd voltage stabilizing didoe D3 ' conducting is high level on the control electrode of transistor seconds Q2.When reaching predetermined, dimmer 1 measures, for example during dimmer 1 not conducting, on the 8th resistance R 8, level is lower, the 4th not conducting of voltage stabilizing didoe D4 ', the level of the work electrode of the 4th transistor Q4, the level of control electrode that is to say the 3rd transistor Q3 is higher, the 3rd transistor Q3 and transistor seconds Q2 conducting, and the first transistor Q1 is turned off because its control electrode level drags down; When the conducting edge of dimmer 1 arrives, level on the 8th resistance R 8 uprises, the 4th voltage stabilizing didoe D4 ' conducting, the 4th transistor Q4 conducting and the 3rd transistor Q3 turn-offs, the 4th capacitor C 4 is through the first transistor Q1 meeting conducting after the charging of certain hour, when this section regular time can guarantee that rising edge arrives, damping element R ' current flowing still, play certain damping action, prevents that the vibration of dimmer 1 electric current from causing light flash.
According to antihunt circuit of the present invention can with LED driver in dissimilar converter mutually mate use, for example can mate use with different topology structure example such as reaction type converter and decompression transducer.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Label list
1 dimmer
S1-S4 the first, the second, the three, the four control signal
4 first detection modules
4.1 the first detecting unit
4.2 the second detecting unit
5.1 the first switch module
5.2 second switch module
6 second detection modules
7 power converters
8 load LED
9 rectifying devices
10 antihunt circuits
11 first branch roads
12 second branch roads
100 (LED) driver
The V_out signal end
V_Detector1 the first detection signal end
The Vin_DC Input voltage terminal
R ' damping element
R1, R2....R9 the first, the second ... .. the 9th resistance
C1, C2....C5 the first, the second ... .. the 5th electric capacity
D1, D2 the first, the second diode
D1 ', D2 ', D3 ', D4 ' the first, the second, the three, the four voltage stabilizing didoe
Q1, Q2, Q3, Q4 the first, the second, the three, the four transistor
Claims (23)
1. antihunt circuit (10) that is used for driver (100), be used for suppressing flicker, comprise: by the first electric capacity (C1) that is one another in series, the first branch road (11) that the first resistance (R1) consists of and at least one damping element (R '), described the first branch road (11) connects Input voltage terminal (Vin_DC), it is characterized in that, described antihunt circuit (10) also comprises recognition control circuit, described recognition control circuit comprises measuring ability module and switching function module, at least one detection signal that described measuring ability module collection characterizes the change in voltage that comes from described Input voltage terminal (Vin_DC) with produce front the first control signal (S1) that is not connected with dimmer (1) of the described driver of identification (100) and before be connected to second control signal (S2) of dimmer, perhaps produce front the 3rd control signal (S3) or the described dimmer (1) that reach the predetermined described dimmer (1) of measuring of being connected to of described driver (100) and do not reach described predetermined the 4th control signal (S4) of measuring, described switching function module is according to described the first control signal (S1) or the 3rd control signal (S3) and the operating state of controlling described damping element (R ') according to the second control signal (S2) or the 4th control signal (S4).
2. antihunt circuit according to claim 1 (10), it is characterized in that, described damping element (R ') is power resistor, and described switching function module is connected described damping element (R ') according to described the first control signal (S1) or the 3rd control signal (S3) with described damping element (R ') short circuit and according to the second control signal (S2) or the 4th control signal (S4).
3. antihunt circuit according to claim 1 (10), it is characterized in that, described damping element (R ') is inductance, described switching function module connect described damping element (R ') according to described the first control signal (S1) or the 3rd control signal (S3) and according to the second control signal (S2) or the 4th control signal (S4) with described damping element (R ') short circuit.
4. the described antihunt circuit of any one (10) according to claim 1-3, it is characterized in that, described measuring ability module comprises described first detection module (4), described switching function module comprises the first switch module (5.1), described first detection module (4) gathers the first detection signal to produce described the first control signal (S1) or the second control signal (S2) from the first detection signal end (V_Detector1) between described the first electric capacity (C1) and the first resistance (R1), described the first switch module (5.1) is according to described first, the second control signal (S1, S2) control the operating state of described damping element (R ').
5. antihunt circuit according to claim 4 (10), it is characterized in that, described first detection module (4) comprises the first detecting unit (4.1) of cutting described the first control signal (S1) and described second control signal (S2) of dimmer (1) before whether produce identification before is connected to.
6. antihunt circuit according to claim 5 (10), it is characterized in that, when described the first detecting unit (4.1) is cut dimmer (1) before before not being connected to output as the low level signal of described the first control signal (S1) or cut dimmer (1) before front being connected to time output as the high level signal of described the second control signal (S2).
7. antihunt circuit according to claim 6 (10), it is characterized in that, described the first detecting unit (4.1) comprises the first diode (D1), the second resistance (R2) that is one another in series and the 3rd resistance (R3), and second electric capacity (C2), the positive pole of described the first diode (D1) is connected to an end of negative pole described second resistance of connection (R2) of described the first detection signal end (V_Detector1) and the first diode (D1), described the second electric capacity (C2) and described the second resistance (R2) that is one another in series, described the 3rd resistance (R3) parallel connection, be provided between described the second resistance (R2) and described the 3rd resistance (R3) the described first or second control signal (S1, S2) signal end (V_out) of the control signal of described the first switch module of input (5.1), the other end of described the 3rd resistance (R3) is connected to earth potential.
8. antihunt circuit according to claim 4 (10), is characterized in that, described the first switch module (5.1) comprises the first switch element.
9. antihunt circuit according to claim 8 (10), it is characterized in that, described the first switch element is the first transistor (Q1), described damping element (R ') be connected between the work electrode and reference electrode of described the first transistor (Q1) the reference electrode earthing potential of described the first transistor (Q1).
10. antihunt circuit according to claim 9 (10), it is characterized in that, described the first switch module (5.1) also comprises the first clamp circuit for described the first transistor (Q1), and described the first clamp circuit comprises the control electrode that is connected to described the first transistor (Q1) and the 4th electric capacity (C4) between earth potential and/or the first voltage stabilizing didoe (D1 ').
11. antihunt circuit according to claim 8 (10), it is characterized in that, described the first switch module (5.1) also comprises the second switch element, is used for the switch of controlling described the first switch element according to from described the first control signal (S1) and described second control signal (S2) of signal end (V_out).
12. antihunt circuit according to claim 11 (10), it is characterized in that, described second switch element is transistor seconds (Q2), and the control electrode connection described signal end (V_out) of described transistor seconds (Q2) and the work electrode of described transistor seconds (Q2) are connected to control electrode and the reference electrode earthing potential of described the first transistor (Q1).
13. antihunt circuit according to claim 12 (10), it is characterized in that, described the first switch module (5.1) also comprises the second clamp circuit for described transistor seconds (Q2), and described the second clamp circuit comprises the described control electrode that is connected to described transistor seconds (Q2) and the 3rd electric capacity (C3) between described earth potential and/or the second voltage stabilizing didoe (D2 ').
14. antihunt circuit according to claim 12 (10), it is characterized in that, described the first switch module (5.1) also comprises the 3rd voltage stabilizing didoe (D3 '), and an end of described the 3rd voltage stabilizing didoe (D3 ') is connected to the described control electrode that described signal end (V_out) and the other end connect described transistor seconds (Q2).
15. antihunt circuit according to claim 7 (10), it is characterized in that, described antihunt circuit (100) also comprises the second branch road (12) that is connected to described Input voltage terminal (Vin_DC), described the second branch road (12) comprises the 5th resistance (R5) and the 6th resistance (R6) as divider resistance that is one another in series, and the control electrode of described the first transistor (Q1) is connected between described the 5th resistance (R5) and described the 6th resistance (R6).
16. antihunt circuit according to claim 7 (10), it is characterized in that, described first detection module (4) comprises the second detecting unit (4.2) of cutting described the first control signal (S1) and described second control signal (S2) of dimmer (1) after whether produce identification together with described the first detecting unit (4.1) before is connected to.
17. antihunt circuit according to claim 16 (10), it is characterized in that, described the second detecting unit (4.2) comprises the 5th electric capacity (C5), the second diode (D2), described the 5th electric capacity (C5) end connects described the first detection signal end (V_Detector1), the described other end is connected to respectively the described positive terminal of described the first diode (D1) and the negative pole end of described the second diode (D2), and the positive terminal of described the second diode (D2) is connected to the other end of described the 3rd resistance (R3).
18. the described antihunt circuit of any one (10) according to claim 2-17, it is characterized in that, described measuring ability module also comprises the second detection module (6), and whether described the second detection module (6) generation identification before is connected to described the 3rd control signal (S3) or the described dimmer (1) that reach the described predetermined described dimmer (1) of measuring does not reach described predetermined described the 4th control signal (S4) of measuring.
19. antihunt circuit according to claim 18 (10), it is characterized in that, described the second detection module (6) is the 3rd branch road that is comprised of the 7th resistance (R7) and the 8th resistance (R8) that is connected with described Input voltage terminal (Vin), from output described the 3rd control signal (S3), the 4th control signal (S4) between described the 7th resistance (R7) and described the 8th resistance (R8).
20. antihunt circuit according to claim 19 (10), it is characterized in that, described switching function module comprises second switch module (5.2), and described the first switch module (5.1) is controlled the operating state of described damping element (R ') according to described the 3rd control signal (S3) or the 4th control signal (S4) according to described the second control signal (S2) and described second switch module (5.2).
21. antihunt circuit according to claim 20 (10), it is characterized in that, described second switch module (5.2) comprises the 3rd transistor (Q3), the 4th transistor (Q4), the 4th voltage stabilizing didoe (D4 ') and the 9th resistance (R9), the work electrode of described the 3rd transistor (Q3) is connected with the reference electrode of described transistor seconds (Q2) and its reference electrode connects earth potential, the control electrode of described the 4th transistor (Q4) and the 4th voltage stabilizing didoe (D4 ') be connected, its work electrode is connected with the work electrode of described transistor seconds (Q2) through described the 9th resistance (R9) and work electrode is connected with the control electrode of described the 3rd transistor (Q3).
22. a driver (100) comprises the described antihunt circuit of any one (10) according to claim 1-21.
23. an illuminator comprises driver according to claim 22 (100).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110359481.1A CN103108435B (en) | 2011-11-14 | 2011-11-14 | Damping circuit, light-emitting diode (LED) driver and LED lighting system |
| PCT/EP2012/069022 WO2013072111A1 (en) | 2011-11-14 | 2012-09-27 | Damping circuit, led driver and led illuminating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110359481.1A CN103108435B (en) | 2011-11-14 | 2011-11-14 | Damping circuit, light-emitting diode (LED) driver and LED lighting system |
Publications (2)
| Publication Number | Publication Date |
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| CN103108435A true CN103108435A (en) | 2013-05-15 |
| CN103108435B CN103108435B (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110359481.1A Expired - Fee Related CN103108435B (en) | 2011-11-14 | 2011-11-14 | Damping circuit, light-emitting diode (LED) driver and LED lighting system |
Country Status (2)
| Country | Link |
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| CN (1) | CN103108435B (en) |
| WO (1) | WO2013072111A1 (en) |
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| CN105282916A (en) * | 2014-06-09 | 2016-01-27 | 恩智浦有限公司 | Lighting circuits, luminaries and methods compatible with phase-cut mains supplies |
| CN105491754A (en) * | 2014-10-01 | 2016-04-13 | 美格纳半导体有限公司 | Light emitting diode driving circuit and lighting apparatus having the same |
| CN106714401A (en) * | 2015-08-14 | 2017-05-24 | 通用电气照明解决方案有限公司 | Damping circuit, LED driver and LED lighting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2977781C (en) * | 2015-02-25 | 2020-03-24 | Osram Sylvania Inc. | Active damping circuit |
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Also Published As
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| CN103108435B (en) | 2017-05-24 |
| WO2013072111A1 (en) | 2013-05-23 |
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