CN102843802A - Control method and circuit applied to two-line light modulator - Google Patents
Control method and circuit applied to two-line light modulator Download PDFInfo
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- CN102843802A CN102843802A CN2011101049793A CN201110104979A CN102843802A CN 102843802 A CN102843802 A CN 102843802A CN 2011101049793 A CN2011101049793 A CN 2011101049793A CN 201110104979 A CN201110104979 A CN 201110104979A CN 102843802 A CN102843802 A CN 102843802A
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Abstract
The invention discloses a control method applied to a two-line light modulator. According to the invention, a chopper switch in the two-line light modulator is always in a chopping state in all periods, and an after-class driver of the two-line light modulator comprises an impedance matching circuit and an impedance matching control circuit; the method comprises the following steps that: the impedance matching control circuit detects driver input voltages Vac, and controls the impedance matching circuit to work at a low impedance level within a maximum chopping angle of each AC half cycle and work at a high impedance level at other times. The invention provides a control method and a circuit applied to the two-line light modulator, which are used for enabling an output waveform of the two-line light modulator to close to the ideal waveform.
Description
Technical field
The present invention relates to circuit field, particularly a kind of control method and circuit that is applicable to two-wire dimmer.
Background technology
Existing two-wire dimmer is connected between electrical network (Hot) and the load end (DimmedHot) usually, because the wiring of dimmer and electrical network and load end has only two, so the called after two-wire dimmer.
Two-wire dimmer inside can be adopted MOSFET pipe usually, IGBT, perhaps semiconductor power device such as controllable silicon is as chopping switch, when dimmer when half AC power cycle has output to continue no-voltage, claim that this dimmer output voltage is a chopping voltage.Corresponding chopping switch operating state is the copped wave state.
In half ac cycle, corresponding phase angle is the copped wave phase angle no-voltage duration in the dimmer output voltage, exports the chopping voltage of different copped wave phase angles through the control chopping switch, and the size of copped wave phase angle is represented the size of dim signal.And in the driver of back level,, export the electric current of corresponding amplitude according to copped wave phase angle Control Driver through the size of copped wave phase angle in the detection chopping voltage, the size of Control Driver output current.
In dimmer, generally need confirm the zero crossing of alternating voltage Vin through the voltage that detects the chopping switch two ends, like the circuit block diagram of the existing said two-wire dimmer of Fig. 1.Zero cross detection circuit detects the zero crossing of Vin among Fig. 1.
Control circuit is through the zero cross signal of zero cross detection circuit output, and the control chopping switch makes the corresponding chopping voltage of its output control signal.Referring to Fig. 2, this figure is desirable chopping voltage oscillogram.When two-wire dimmer output voltage V ac was chopping voltage, desirable chopping voltage waveform was as shown in Figure 2.
But in fact, under the dimmer band opens the light the situation of power supply quasi-driver load, filter capacitor is all arranged usually at the interchange input side of driver; Being equivalent to has increased capacitive load to dimmer, when the dimmer chopping switch turn-offs, when the not conducting of rectifier bridge of Switching Power Supply or ac-side current are very little; The velocity of discharge of AC side filter capacitor is very slow; So the output waveform of actual dimmer is common, as shown in Figure 3, this figure is the output waveform figure of the actual dimmer of existing said two-wire dimmer.
The imperfect waveform of Fig. 3, can influence in dimmer zero cross detection circuit export the accuracy of zero cross signal, make control circuit correctly detect zero crossing, the phase angle of the chopping voltage that causes exporting is inaccurate.Simultaneously, the Switching Power Supply quasi-driver of back level also detects less than correct chopping voltage phase angle, can not export real copped wave phase angle current corresponding amplitude.
Therefore, how a kind of control method and circuit that is applicable to two-wire dimmer is provided, the output waveform that makes two-wire dimmer is those skilled in the art's technical issues that need to address near ideal waveform.
Summary of the invention
The purpose of this invention is to provide a kind of control method and circuit that is applicable to two-wire dimmer, the output waveform that is used to make two-wire dimmer is near ideal waveform.
For addressing the above problem; The present invention provides a kind of control method that is applicable to two-wire dimmer; Chopping switch in the two-wire dimmer always works in the copped wave state in all cycles; Comprise impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer, said method comprises:
Said impedance matching control circuit detects driver input voltage Vac, controls said impedance matching circuit and in the maximum copped wave angle of each interchange half period, is operated in Low ESR, and all the other time services are at high impedance.
The present invention provides a kind of circuit that is applicable to two-wire dimmer, and said circuit comprises:
Be arranged on impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer;
Said impedance matching control circuit comprises detection sub-unit, control sub unit;
Said detection sub-unit detects driver input voltage Vac;
Said control sub unit is controlled said impedance matching circuit and in maximum copped wave angle, is operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
The present invention provides a kind of control method that is applicable to two-wire dimmer; The chopping switch of two-wire dimmer only is operated in the copped wave state in the partial periodicity of alternating voltage; And in other cycle, be operated in complete conducting state; Comprise impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer, said method comprises:
Said impedance matching control circuit detects driver input voltage Vac; And judge whether input voltage Vac is chopping voltage; When driver input voltage Vac is chopping voltage,, controls said impedance matching circuit and in maximum copped wave angle, be operated in Low ESR in each half period of driver input voltage Vac; When the driver input voltage was non-chopping voltage, impedance matching circuit was operated in high impedance.
The present invention provides a kind of circuit that is applicable to two-wire dimmer, and said circuit comprises:
Be arranged on impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer;
Said impedance matching control circuit comprises detection sub-unit, judgment sub-unit, control sub unit;
Said detection sub-unit detects driver input voltage Vac;
Said judgment sub-unit judges whether input voltage Vac is chopping voltage; When Vac is chopping voltage, in each half period of driver input voltage Vac, control said impedance matching circuit through said control sub unit and in maximum copped wave angle, be operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
Preferably, the input side of said impedance matching control circuit is connected with rectification circuit.
Preferably, said rectification circuit is a rectifier bridge.
Preferably, said rectification circuit both sides are parallel with filter capacitor.
Preferably, be connected with constant-current circuit between said impedance matching circuit and the light source load.
Compare with above-mentioned prior art; The said control method that is applicable to two-wire dimmer of the embodiment of the invention; Chopping switch in the two-wire dimmer always works in the copped wave state in all cycles; Comprise impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer; Said method comprises: said impedance matching control circuit detects driver input voltage Vac, controls said impedance matching circuit and in the maximum copped wave angle of each interchange half period, is operated in Low ESR, and all the other time services are at high impedance.So just make the two-wire dimmer output waveform approach ideal waveform, be convenient to the part control circuit operate as normal of two-wire dimmer inside and back level driver.
The said circuit that is applicable to two-wire dimmer of the embodiment of the invention is owing to increased impedance matching circuit and the impedance matching control circuit in the back level driver that is arranged on two-wire dimmer; Said impedance matching control circuit comprises detection sub-unit, control sub unit; Detection sub-unit detects driver input voltage Vac; When Vac is chopping voltage,, in maximum copped wave angle, be operated in Low ESR through the control group match circuit in each half period of driver input voltage Vac.So just make the two-wire dimmer output waveform approach ideal waveform, be convenient to the part control circuit operate as normal of two-wire dimmer inside and back level driver.
The chopping switch of two-wire dimmer only is operated in the copped wave state in the partial periodicity of ac output voltage, and in other cycle, is operated in complete conducting state; And impedance matching circuit only is operated in Low ESR in the maximum copped wave angle of copped wave state, can unnecessary power consumption be dropped to minimum.
Description of drawings
Fig. 1 is the circuit block diagram of existing said two-wire dimmer;
Fig. 2 is desirable chopping voltage oscillogram;
Fig. 3 is the output waveform figure of the actual dimmer of existing said two-wire dimmer;
Fig. 4 is the oscillogram of dimmer output voltage V ac under first kind of situation of the circuit that is applicable to two-wire dimmer according to the invention;
Fig. 5 is the said circuit block diagram that is applicable to two-wire dimmer under first kind of situation of the present invention.
When Fig. 6 is first kind of situation of circuit that is applicable to two-wire dimmer according to the invention, the process chart of impedance matching control circuit;
Fig. 7 is the oscillogram of dimmer output voltage V ac under second kind of situation of the circuit that is applicable to two-wire dimmer according to the invention;
The circuit block diagram that Fig. 8 embodiment of the invention is said when being applicable to second kind of situation of two-wire dimmer;
When Fig. 9 is second kind of situation of circuit that is applicable to two-wire dimmer according to the invention, the process chart of impedance matching control circuit;
Figure 10 is dimmer output voltage V ac under second kind of situation of the circuit that is applicable to two-wire dimmer according to the invention, the oscillogram of the detected signal Vs of rectifier bridge output voltage V dc and impedance matching.
Embodiment
The present invention provides a kind of control method and circuit that is applicable to two-wire dimmer, and the output waveform that is used to make two-wire dimmer is near ideal waveform.
For describing conveniently definition:
1, the cycle of dimmer output chopping voltage is a chopping cycle, and the cycle of not exporting chopping voltage is non-chopping cycle.
2, chopping voltage in half ac cycle, has the voltage of lasting zero level.
3, chopping voltage phase angle, in chopping voltage, the zero level duration is at AC power pairing phase angle in the cycle.
4, maximum copped wave angle is the maximum of chopping voltage phase angle, also is in the chopping voltage, the phase angle in the corresponding ac cycle of the maximum of zero level duration.
Preferably; In the non-chopping cycle of the predetermined number of chopping switch before chopping cycle, the control chopping switch is operated in linear condition, helps obtaining more accurately the zero passage moment or the peak value moment of AC power like this; In remaining non-chopping cycle, chopping switch is operated in the saturation region.
For the technical staff who makes the present technique field understands the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
The operating state of the chopping switch of two-wire dimmer is divided into two kinds:
First kind of situation, the chopping switch of two-wire dimmer always work in the copped wave state in all cycles.
Second kind of situation, the chopping switch of two-wire dimmer only is operated in the copped wave state in the partial periodicity of alternating voltage, and in other cycle, is operated in complete conducting state.
Under first kind of situation, the oscillogram of two-wire dimmer output voltage V ac, as shown in Figure 4.
Referring to Fig. 5, this figure is the said circuit block diagram that is applicable to two-wire dimmer under first kind of situation of the present invention.
The said circuit that is applicable to two-wire dimmer of the embodiment of the invention comprises:
Be arranged on impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer.
Said impedance matching control circuit comprises detection sub-unit, control sub unit.
Said detection sub-unit detects driver input voltage Vac;
Said control sub unit is controlled said impedance matching circuit and in maximum copped wave angle, is operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
Need to prove that " the said maximum copped wave angle " mentioned among the application is the maximum of the copped wave phase angle of dimmer output chopping voltage.For example, dimmer is under the effect of control signal, and the excursion of copped wave phase angle is 0 °～90 °, and then maximum copped wave angle is 90 °.
Need to prove; " impedance matching circuit is operated in Low ESR in maximum copped wave angle " mentioned among the application; Be meant: how many no matter copped wave angles is, in the half period of each chopping voltage, impedance matching circuit is operated in Low ESR all the time in maximum copped wave angle.For example, the excursion of copped wave phase angle is 0 °～90 °, and maximum copped wave angle is 90 °; If the chopping voltage in a certain moment is forward position formula copped wave; Its copped wave phase angle is the unspecified angle in 0 °～90 °, and impedance matching circuit is operated in Low ESR in 0 °～90 ° of half period of this chopping voltage; If behind the chopping voltage in a certain moment along formula copped wave; Its copped wave phase angle is the unspecified angle in 0 °～90 °, impedance matching circuit half period of this chopping voltage in 90 °～180 °, be operated in Low ESR; Also promptly, as long as chopping voltage is arranged, no matter the phase angle of chopping voltage is which angle in its excursion, and impedance matching circuit all is operated in Low ESR in maximum copped wave angle.
The input side of said impedance matching control circuit is connected with rectification circuit.Said rectification circuit specifically can be rectifier bridge.
Wherein, the impedance matching control circuit be input as the rectifier bridge output voltage, its output control signal is given impedance matching circuit, the impedance of control group match circuit.
Be connected with constant-current circuit between said impedance matching circuit and the said light source load, for the light source load provides constant current.
Under first kind of situation, the chopping switch of two-wire dimmer all is operated in the copped wave state in all cycles, and said impedance matching circuit is operated in Low ESR in the maximum copped wave angle of each interchange half period.Like this, guaranteed any moment that chopping switch turn-offs, the impedance matching circuit in the driver all is in Low ESR, therefore, has quickened the discharge process of capacitive load of the interchange input side of driver, makes the chopping voltage more near ideal waveform.
Participate in Fig. 6, during first kind of situation of circuit that is applicable to two-wire dimmer according to the invention, the process chart of impedance matching control circuit.
First kind of situation; The chopping switch of two-wire dimmer is in all cycles of alternating voltage; All be operated in the copped wave state; The detection sub-unit of said impedance matching control circuit detects driver input voltage Vac, and control sub unit is controlled said impedance matching circuit and in maximum copped wave angle, is operated in Low ESR.
Said maximum copped wave angle is the maximum of the copped wave phase angle of dimmer output chopping voltage.For example, dimmer is under the effect of control signal, and the excursion of copped wave phase angle is 0 °～90 °, and then maximum copped wave angle is 90 °.
Because in the chopping switch turn off process, the impedance matching circuit in the driver is operated in Low ESR, therefore, has quickened the discharge process of capacitive load of the interchange input side of driver, makes chopping voltage more near ideal waveform.
The said control method that is applicable to two-wire dimmer of the embodiment of the invention; Chopping switch in the two-wire dimmer always works in the copped wave state in all cycles; Promptly under first kind of situation; Comprise impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer, said method comprises:
Said impedance matching control circuit detects driver input voltage Vac, controls said impedance matching circuit and in the maximum copped wave angle of each interchange half period, is operated in Low ESR, and all the other time services are at high impedance.
Under second kind of situation, the oscillogram of two-wire dimmer output voltage V ac, as shown in Figure 7.
Referring to Fig. 8, this figure is the said circuit block diagram that is applicable to two-wire dimmer under second kind of situation of the present invention.
The said circuit that is applicable to two-wire dimmer of the embodiment of the invention comprises:
Be arranged on impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer.
Said impedance matching control circuit comprises detection sub-unit, judgment sub-unit, control sub unit.
Said detection sub-unit detects driver input voltage Vac;
Said judgment sub-unit judges whether input voltage Vac is chopping voltage; When Vac is chopping voltage, in each half period of driver input voltage Vac, control said impedance matching circuit through said control sub unit and in maximum copped wave angle, be operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
The input side of said impedance matching control circuit is connected with rectification circuit.Said rectification circuit specifically can be rectifier bridge.
Wherein, the impedance matching control circuit be input as the rectifier bridge output voltage, its output control signal is given impedance matching circuit, the impedance of control group match circuit.
Be connected with constant-current circuit between said impedance matching circuit and the said light source load, for the light source load provides constant current.
Referring to Fig. 9, during second kind of situation of circuit that is applicable to two-wire dimmer according to the invention, the process chart of impedance matching control circuit.
Second kind of situation; Only be operated in the copped wave state in the partial periodicity at alternating voltage when the chopping switch of two-wire dimmer; And when in other cycle, being operated in complete conducting state, the detection sub-unit of said impedance matching control circuit detects driver input voltage Vac, judges through judgment sub-unit whether input voltage Vac is chopping voltage; When Vac is chopping voltage; In each half period of Vac, control sub unit is controlled said impedance matching circuit and in maximum copped wave angle, is operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
Said maximum copped wave angle is the maximum of the copped wave phase angle of dimmer output chopping voltage.For example, dimmer is under the effect of control signal, and the excursion of copped wave phase angle is 0 °～90 °, and then maximum copped wave angle is 90 °.
The said control method that is applicable to two-wire dimmer of the embodiment of the invention; The chopping switch of two-wire dimmer only is operated in the copped wave state in the partial periodicity of alternating voltage; And in other cycle, be operated in complete conducting state; Promptly during second kind of situation, comprise impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer, said method comprises:
Said impedance matching control circuit detects driver input voltage Vac; And judge whether input voltage Vac is chopping voltage; When driver input voltage Vac is chopping voltage,, controls said impedance matching circuit and in maximum copped wave angle, be operated in Low ESR in each half period of driver input voltage Vac; When the driver input voltage was non-chopping voltage, impedance matching circuit was operated in high impedance.
The said circuit that is applicable to two-wire dimmer of the embodiment of the invention is owing to increased impedance matching circuit and the impedance matching control circuit in the back level driver that is arranged on two-wire dimmer; When the chopping switch of two-wire dimmer in all cycles; When all being operated in the copped wave state; Said impedance matching control circuit detects driver input voltage Vac; Control said impedance matching circuit and in the maximum copped wave angle of each interchange half period, be operated in Low ESR, all the other time services are at high impedance; Only be operated in the copped wave state in the partial periodicity at alternating voltage when the chopping switch of two-wire dimmer; And when in other cycle, being operated in complete conducting state, said impedance matching control circuit detects driver input voltage Vac, and judges whether input voltage Vac is chopping voltage; When Vac is chopping voltage; In each half period of Vac, to control said impedance matching circuit and in maximum copped wave angle, be operated in Low ESR, all the other time services are at high impedance; Make the two-wire dimmer output waveform approach ideal waveform, be convenient to the part control circuit operate as normal of two-wire dimmer inside and back level driver.
With reference to Figure 10, this figure is dimmer output voltage V ac under second kind of situation of the circuit that is applicable to two-wire dimmer according to the invention, the oscillogram of the detected signal Vs of rectifier bridge output voltage V dc and impedance matching.
Under second kind of situation, two-wire dimmer output voltage V ac (being the driver input voltage), rectifier bridge output voltage V dc (being impedance matching control circuit input voltage in the present embodiment), and the detected signal Vs of impedance matching.
When the complete conducting of chopping switch; When promptly being operated in non-chopping cycle; The detected signal of impedance matching control circuit of back level internal drive is at the periodic narrow pulse signal of zero cross near, and like the pulse signal A1 of Vs among the figure, impedance matching circuit is operated in high impedance;
Said rectification circuit both sides specifically can be parallel with filter capacitor Cx.When chopping switch begins operating in the copped wave state; This moment is because impedance matching circuit is operated in high impedance; The velocity of discharge of driver AC side filter capacitor Cx is very slow, and two-wire dimmer output voltage V ac is nonideal chopping voltage waveform, and the detected signal of impedance matching control circuit of back level internal drive will change; Not periodic signal, like the pulse signal A2 of Vs among Figure 10.The variation of pulse signal A2 shows that the dimmer chopping switch begins copped wave, then need be operated in Low ESR in the maximum copped wave angle of driver middle impedance match circuit each interchange half period after this.
When chopping switch begins operating in the copped wave state; When impedance matching circuit is operated in Low ESR in maximum copped wave angle; Two-wire dimmer output voltage V ac is desirable chopping voltage waveform; The detected pulse signal of impedance matching control circuit of back level internal drive is for reflecting the signal of prime copped wave phase angle really, like the pulse signal A3 among Figure 10.
The said circuit of the embodiment of the invention makes the two-wire dimmer output waveform approach ideal waveform owing to add impedance matching circuit, is convenient to the part control circuit operate as normal of dimmer inside and back level driver.
The chopping switch of the said two-wire dimmer of the embodiment of the invention only is operated in the copped wave state in the partial periodicity of ac output voltage, and in other cycle, is operated in complete conducting state; And impedance matching circuit only is operated in Low ESR in the maximum copped wave angle of copped wave state, has realized unnecessary power consumption is dropped to minimum effect.
The above only is the preferred implementation that is applicable to the circuit of two-wire dimmer according to the invention; Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (8)
1. control method that is applicable to two-wire dimmer; It is characterized in that; Chopping switch in the two-wire dimmer always works in the copped wave state in all cycles, comprise impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer, and said method comprises:
Said impedance matching control circuit detects driver input voltage Vac, controls said impedance matching circuit and in the maximum copped wave angle of each interchange half period, is operated in Low ESR, and all the other time services are at high impedance.
2. a circuit that is applicable to two-wire dimmer is characterized in that, said circuit comprises:
Be arranged on impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer;
Said impedance matching control circuit comprises detection sub-unit, control sub unit;
Said detection sub-unit detects driver input voltage Vac;
Said control sub unit is controlled said impedance matching circuit and in maximum copped wave angle, is operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
3. control method that is applicable to two-wire dimmer; It is characterized in that; The chopping switch of two-wire dimmer only is operated in the copped wave state in the partial periodicity of alternating voltage; And in other cycle, be operated in complete conducting state, and comprising impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer, said method comprises:
Said impedance matching control circuit detects driver input voltage Vac; And judge whether input voltage Vac is chopping voltage; When driver input voltage Vac is chopping voltage,, controls said impedance matching circuit and in maximum copped wave angle, be operated in Low ESR in each half period of driver input voltage Vac; When the driver input voltage was non-chopping voltage, impedance matching circuit was operated in high impedance.
4. a circuit that is applicable to two-wire dimmer is characterized in that, said circuit comprises:
Be arranged on impedance matching circuit and impedance matching control circuit in the back level driver of two-wire dimmer;
Said impedance matching control circuit comprises detection sub-unit, judgment sub-unit, control sub unit;
Said detection sub-unit detects driver input voltage Vac;
Said judgment sub-unit judges whether input voltage Vac is chopping voltage; When Vac is chopping voltage, in each half period of driver input voltage Vac, control said impedance matching circuit through said control sub unit and in maximum copped wave angle, be operated in Low ESR, control said impedance matching circuit in all the other time services at high impedance.
5. the circuit that is applicable to two-wire dimmer according to claim 4 is characterized in that the input side of said impedance matching control circuit is connected with rectification circuit.
6. the circuit that is applicable to two-wire dimmer according to claim 5 is characterized in that, said rectification circuit is a rectifier bridge.
7. the circuit that is applicable to two-wire dimmer according to claim 5 is characterized in that, said rectification circuit both sides are parallel with filter capacitor.
8. the circuit that is applicable to two-wire dimmer according to claim 4 is characterized in that, is connected with constant-current circuit between said impedance matching circuit and the light source load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101049793A CN102843802A (en) | 2011-04-26 | 2011-04-26 | Control method and circuit applied to two-line light modulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101049793A CN102843802A (en) | 2011-04-26 | 2011-04-26 | Control method and circuit applied to two-line light modulator |
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| CN102843802A true CN102843802A (en) | 2012-12-26 |
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| CN2011101049793A Pending CN102843802A (en) | 2011-04-26 | 2011-04-26 | Control method and circuit applied to two-line light modulator |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008541370A (en) * | 2005-05-09 | 2008-11-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Method and circuit for realizing dimming by a triac dimmer |
| CN101588673A (en) * | 2008-05-23 | 2009-11-25 | 上海阿卡得电子有限公司 | Method and device for controlling dimming of online integral-type gas discharge lamp |
-
2011
- 2011-04-26 CN CN2011101049793A patent/CN102843802A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008541370A (en) * | 2005-05-09 | 2008-11-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Method and circuit for realizing dimming by a triac dimmer |
| CN101588673A (en) * | 2008-05-23 | 2009-11-25 | 上海阿卡得电子有限公司 | Method and device for controlling dimming of online integral-type gas discharge lamp |
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Application publication date: 20121226 |