CN101404848A - Electronic ballast and general lamp seat having the same - Google Patents
Electronic ballast and general lamp seat having the same Download PDFInfo
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- CN101404848A CN101404848A CNA2008102184644A CN200810218464A CN101404848A CN 101404848 A CN101404848 A CN 101404848A CN A2008102184644 A CNA2008102184644 A CN A2008102184644A CN 200810218464 A CN200810218464 A CN 200810218464A CN 101404848 A CN101404848 A CN 101404848A
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Abstract
The invention discloses an electronic ballast which comprises a filter circuit, a rectification circuit, a phase shedding detection circuit, a power factor correction circuit, a resonance circuit and a control circuit. The filter circuit and the rectification circuit are connected with an alternating power supply. One end of the phase shedding detection circuit is connected with an output end of a rectification circuit, and the other end thereof is connected with the control circuit. The power factor correction circuit is connected with the output end of the rectification circuit and comprises a half-bridge which consists of two switch transistors connected in series. One end of the resonance circuit is connected with the output end of the half-bridge, and the other end thereof is connected with a lighting tube. The control circuit is connected with control ends of the switch transistors, and the control circuit controls the switch transistors to be switched on and off and the output frequency of the half-bridge by a detection signal of the phase shedding detection circuit. The electronic ballast has simple circuit, low cost and good dimming effect. The invention also discloses a universal lamp holder of an energy saving lamp with the electronic ballast and a dimming method used by the electronic ballast.
Description
Technical field
The present invention relates to a kind of ballast, relate in particular to a kind of energy-saving lamp electronic ballast of tunable optical and have the electricity-saving lamp universal lamp holder of this electric ballast.
Background technology
In daily life, the use of bulb is very extensive.As shown in Figure 1, traditional incandescent lighting circuit comprises: phase-cut dimming device 100, incandescent lamp 200 and the circuit 300 of incandescent lamp brightness imported, is used to regulate to alternating current.Because the service efficiency of incandescent lamp is lower, useful life is short, and along with the raising of life requirement, the enhancing of environmental consciousness, people have just invested durable, flexible, as to reach environmental protection electricity-saving lamp to sight.
Yet existing phase-cut dimming device 100 adopts bidirectional triode thyristor control usually, uses such dimmer not control electricity-saving lamp.This is because for not having power factor correction circuit PFC or having the electricity-saving lamp of power factor correction circuit PPFC for no reason at all, its load characteristic is not resistive, if so directly replace, can find that electricity-saving lamp is not worked or the light modulation process in can flicker, even damage dimmer or electricity-saving lamp.Therefore, in traditional light modulation circuit, can not directly replace and process lamp in vain, thereby cause the user who uses this dimmer on original circuit, to use electricity-saving lamp with electricity-saving lamp.
Development along with the electric ballast technology, using silicon controlled phase modulation dimmer carries out the also development to some extent of technology of light modulation to electricity-saving lamp, but the product of prior art all exists following shortcoming: when dimming behavior reaches stable, all even when not glimmering, complex circuit, the element of its formation is many, cost is high, volume is big, thereby is difficult to apply; The simple product of circuit when light modulation then regular meeting flicker appears and light modulation inhomogeneous, so the better brightness adjustment control circuit of demand is the direction that the electricity-saving lamp light regulating technology develops.
Summary of the invention
One of purpose of the present invention is, a kind of electric ballast that utilizes power factor correction circuit is provided, and it is simple in structure, cost is low, and can use traditional phase-cut dimming device to the electricity-saving lamp light modulation.
Another object of the present invention is to, a kind of electricity-saving lamp universal lamp holder is provided, can realize that the electricity-saving lamp of multiple model is directly replaced, and can use traditional phase-cut dimming device light modulation.
Another purpose of the present invention is, a kind of electricity-saving lamp dimming controlling method is provided, and can realize stablizing light modulation.
To achieve these goals, the invention provides a kind of electric ballast, comprise filtering and rectification circuit, cut testing circuit, power factor correction circuit, resonant circuit and control circuit.Described filtering and rectification circuit are connected with AC power.Described cut testing circuit one end links to each other with the output of described rectification circuit, and the other end links to each other with described control circuit.Described power factor correction circuit links to each other with the output of described rectification circuit, described power factor correction circuit comprises half-bridge, described half-bridge is in series by two switching transistors, and described resonant circuit one end links to each other with the output of described half-bridge, and the other end links to each other with electricity-saving lamp.Described control circuit links to each other with the control end of described switching transistor, and described control circuit is controlled the break-make of described switching transistor and the output frequency of described half-bridge by the detection signal of described cut testing circuit.
In an embodiment of electric ballast of the present invention, described power factor correction circuit also comprises first diode, second diode, first electric capacity, second electric capacity, first inductance and storage capacitor, described storage capacitor is in parallel with described half-bridge, described first electric capacity and second capacitances in series are between described rectification circuit, the tie point of described first electric capacity and second electric capacity links to each other with the output of described half-bridge by described first inductance, and the other end of described first electric capacity and second electric capacity links to each other with the two ends of described storage capacitor with described second diode by described first diode respectively.
In another embodiment of electric ballast of the present invention, the detection signal of described cut testing circuit is the phase sample voltage of signals.
In the another embodiment of electric ballast of the present invention, described electric ballast also comprises and is used to detect fluorescent tube testing circuit whether fluorescent tube install and the lamp current sense circuit that is used for sensed lamp current.Described fluorescent tube testing circuit links to each other with described fluorescent tube with described control unit, and described control circuit is controlled the output frequency of described half-bridge according to the detection signal of described lamp current sense circuit.
Preferably, described half-bridge output frequency is 40KHz-100KHz.
Preferably, described switching transistor is a field effect transistor.
In order to realize another object of the present invention, the invention provides a kind of electricity-saving lamp universal lamp holder, comprise: lamp socket, electric ballast and electricity-saving lamp plug, described electric ballast comprise filtering and rectification circuit, cut testing circuit, power factor correction circuit, resonant circuit and control circuit.Described filtering and rectification circuit are connected with AC power.Described cut testing circuit one end links to each other with the output of described rectification circuit, and the other end links to each other with described control circuit.Described power factor correction circuit links to each other with the output of described rectification circuit, described power factor correction circuit comprises half-bridge, described half-bridge is in series by two switching transistors, and described resonant circuit one end links to each other with the output of described half-bridge, and the other end links to each other with electricity-saving lamp.Described control circuit links to each other with the control end of described switching transistor, and described control circuit is controlled the break-make of described switching transistor and the output frequency of described half-bridge by the detection signal of described cut testing circuit.
In order to realize another purpose of the present invention, the invention provides a kind of dimming controlling method, comprising:
(1) control unit reads the phase sample signal voltage by the cut testing circuit;
(2) table look-up or calculate and the corresponding cut angle of described phase sample signal voltage;
(3) calculate the power that to regulate according to described cut goniometer;
(4) control half-bridge output frequency;
(5) repetition (1)-(4) reach until photometric output numerical value are set.
Compared with prior art, electric ballast of the present invention makes by PFC control need not change traditional illuminating line, directly electricity-saving lamp is carried out brightness adjustment control, and change the frequency of oscillation of ballast, reach the purpose of light modulation according to the angle of flow of dimmer by traditional dimmer.Electric ballast of the present invention is simple in structure, cost is low, and good dimming effect.
Description of drawings
Fig. 1 is the circuit connection diagram of traditional incandescent lighting circuit;
Fig. 2 is the structure function block diagram of an embodiment of electric ballast of the present invention;
Fig. 3 is the circuit theory diagrams of electric ballast shown in Figure 2;
Fig. 4 a is the rough schematic view of the power factor correction circuit of electric ballast shown in Figure 3;
Fig. 4 b is the change curve of power factor correction circuit electric current shown in Fig. 4 a;
Fig. 5 is the rough schematic view of the lamp current sense circuit of electric ballast shown in Figure 3;
Fig. 6 has shown the angle of flow of phase-cut dimming device and the corresponding relation of phase sample signal voltage;
Fig. 7 is the flow chart of the light-dimming method of electric ballast of the present invention;
Fig. 8 is the structural representation of an embodiment of universal lamp holder of the present invention.
Embodiment
Below in conjunction with the accompanying drawing of the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.
With reference to the accompanying drawings, Fig. 2 is the functional block diagram of an embodiment of tunable optical type energy-saving lamp electronic ballast of the present invention.The electric ballast of present embodiment comprises filter circuit 1, rectification circuit 2, power factor correction circuit 3, cut testing circuit 4, control circuit 5, fluorescent tube testing circuit 6, lamp current sense circuit 7 and resonant circuit 9.
In conjunction with Fig. 3, described filter circuit 1 is the EMC filter circuit, comprises filter element CX1, CX2, Rin and ∏ mode filter, and its input is connected with city's AC power by dimmer, and effect is an elimination High-frequency Interference electric wave.Also can be by the EMC filter circuit of other type.
Described rectification circuit 2 comprises four diode D1-D4, is used for the filtered alternating voltage of process is converted to dc pulse moving voltage.Rectification circuit 2 also can be integrated rectifier bridge.
Described power factor correction circuit 3 comprises two switching transistor Q1, Q2, the first diode Db1, the second diode Db2, the first capacitor C f1, the second capacitor C f2, the first inductance L f and storage capacitor Cc.Switching transistor Q1, the Q2 formation half-bridge of connecting from beginning to end.This storage capacitor Cc is in parallel with described half-bridge 3a, and the first capacitor C f1 and the second capacitor C f2 are connected between the described rectification circuit 2, and the tie point M1 of the first capacitor C f1 and the second capacitor C f2 links to each other with the output M2 of half-bridge by the first inductance L f.The other end of the first capacitor C f1 links to each other with storage capacitor Cc one end by the first diode Db1, and the other end of the second capacitor C f2 links to each other with the other end of storage capacitor Cc by the second diode Db2.
In the present embodiment, switching transistor Q1, Q2 are field effect transistor.
Fig. 4 a is the rough schematic view of the power factor correction circuit of electric ballast shown in Figure 3, and Fig. 4 b is the change curve of power factor correction circuit electric current shown in Fig. 4 a.Simply introduce the operation principle of this power factor correction circuit below in conjunction with Fig. 4 a and 4b.In the period 1, i.e. the t0-t1 time period among Fig. 4 b, inductance L f charges.At t0 constantly, the electric current among the inductance L f is 0, and at this moment, Q1 opens, Q2 closes, and Lf charges to Lf by Cf1, Db1, Q1, the linear rising of electric current.Electric current in Lf reaches positive peak, i.e. in the t1 moment, Q1 closes, Q2 opens, and enters second round, and inductance L f charges to storage capacitor Cc simultaneously by Cf1, Db1, Cc and Q2d discharge.The electric current that is discharged to wherein as Lf is 0, i.e. in the t2 moment, in the period 3, i.e. the t2-t3 time period among Fig. 4 b, inductance L f is by Cf2, Lf, Q2, Db2 charging, the linear once more rising of electric current.Electric current in inductance L f reaches negative peak, promptly arrives t3 constantly, and Q1 opens, Q2 closes, and in the period 4, i.e. the t3-t4 time period among Fig. 4 b, Lf charges to storage capacitor Cc simultaneously by Cf2, Lf, Q1d, Cc, Db2 discharge.Above loop cycle reaches the control of capability correction element circuit to electric current.Make that by this power factor correction circuit operating current is continuous in whole ac period, thereby make electricity-saving lamp can directly replace incandescent lamp.
In the present embodiment, described switching transistor Q1, Q2 are controlled by microcontroller U1.
Please consult Fig. 3 once more, described resonant circuit 9 comprises elements such as capacitor C b, Cr, inductance L r.Capacitor C b and inductance L r are connected between the output M2 of electricity-saving lamp 9 and described half-bridge.
Described control circuit 5 comprises microcontroller U1, is used to microcontroller that the AC/DC circuit and the half-bridge drive circuit of power supply are provided.Described AC/DC circuit is made of R3, D5, Z1, Z2, R4, Ca, C1, C2, before half-bridge does not have vibration, by R3 C1, C2 is charged, for microcontroller U1 provides the startup power supply; After lamp work, by Ca, R4, D5 and Z2 C1, C2 are charged, to keep the work of microcontroller U1.Described half-bridge drive circuit is made up of transformer T1, voltage-stabiliser tube Z3-Z6, resistance R 7, R8.Described half-bridge driven also can adopt other type of drive, is not limited only to the half-bridge drive circuit in the present embodiment.
Described cut testing circuit 4 is made up of resistance R 1-R2, R15, capacitor C 5, C6, after resistance R 1, the R2 series connection, one end links to each other with rectification circuit 2, one end ground connection, resistance R 15 is connected between the pin 7 of the tie point of resistance R 1, R2 and described microprocessor U1, and capacitor C 5, C6 are connected in parallel between the pin 7 and ground of described microprocessor.Described control circuit reads the detection signal of described cut testing circuit 4, controls the break-make of described switching transistor and the output frequency of described half-bridge according to described detection signal.In the present embodiment, described detection signal is the phase sample voltage of signals.Any other suitable detection signal all can be employed, and is not limited only to phase sample voltage of signals value.
Described lamp current sense circuit is made up of in conjunction with the operational amplifier of microcontroller U1 inside sampling resistor RCS, resistance R 9-R12, capacitor C 8-C10.Fig. 5 is the rough schematic view of the lamp current sense circuit of electric ballast shown in Figure 3.When electricity-saving lamp work 9, obtain sample rate current by lamp current sampling resistor RCS, amplify through the built-in operational amplifier of microcontroller U1, obtain lamp current Vcs after the filtering, microcontroller U1 draws the operating current of electricity-saving lamp according to Vcs numerical value, thereby obtains the power of electricity-saving lamp.When the electricity-saving lamp operate as normal, less than setting numerical value, microcontroller U1 judges that fluorescent tube is undesired to lamp current suddenly, and can turn off the light so that it is protected this moment.
Described fluorescent tube testing circuit is made up of resistance R 13-R14 and capacitor C 11.As shown in Figure 3, when electricity-saving lamp 8 does not exist,, thereby can cause microcontroller U1 pin 8 voltages to rise, thereby judge that lamp does not exist or filament damages, at this moment, not open, then not turn on light, promptly control half-bridge not export if wait because filament do not exist; If lamp is opened, then close lamp, i.e. half-bridge output is closed.
The operation principle of the ballast in the present embodiment is: city's alternating current passes through rectification circuit 2 rectifications then by 1 filtering of EMC filter circuit, obtains direct voltage VDD.Before electricity-saving lamp started, described microcontroller U1 control half-bridge output frequency was higher than the resonance frequency fs of described resonant circuit, thereby gives filament pre-heating, the heat of filament is increased, thereby lower the high pressure that produces when lamp starts.After preheating was finished, microcontroller U1 controlled described half-bridge and arrives resonance frequency fs rapidly, thereby lighted fluorescent tube.After lamp is lighted, promptly enter light-modulating mode.Owing to adopted soft start, made that the life-span of electricity-saving lamp is prolonged.
When the user regulates dimmer and carries out light modulation, dimmer can be controlled the output of alternating current, thereby the cut voltage Vphase that microcontroller U1 obtains by the cut testing circuit can be along with variation, this moment, microcontroller was according to its voltage that obtains, calculate the lighting level that the user need be provided with, be power, and then obtain the predetermined current Is of lamp.Microcontroller U1 can be by tabling look-up or calculate the value of predetermined current Is, this table and calculate desired data and all be set in advance in the microcontroller U1.At this moment, by the lamp current sense circuit sensed lamp current, when lamp current during less than preset value, microcontroller U1 control half-bridge output frequency makes its increase; When lamp current during greater than preset value, microcontroller U1 control half-bridge output frequency reduces it, thereby reaches the purpose of light modulation.
When the user or the like brightness be transferred to be lower than minimum brightness after, lamp plays pendulum, and can produce flicker or damages.For fear of this situation, sensed lamp current is found lamp current less than setting numerical value or occurring when interrupted, and microcontroller can cut out lamp automatically.Have only when the user readjusts the voltage that dimmer makes lamp to reach the voltage that it can normally start, just can reopen lamp.
Because the output end voltage of power factor correction circuit is along with the angle of flow of dimmer changes in the present embodiment, as shown in Figure 6, when dimmer in the angle of flow is the F-90 degree during conducting, the output voltage of PFC remains on about the alternating current peak value, voltage does not change with the angle of flow, at this moment, microcontroller U1 comes light modulation by the output frequency of regulating half-bridge; When the angle of flow of dimmer when the 90-M degree changes, the output end voltage of power factor correction circuit is along with the angle of flow changes, at this moment, light modulation is by output voltage and regulating frequency acting in conjunction.
Angle of flow F depends on dimmer and circuit, is generally the 40-50 degree.Angle of flow M depends on lamp type.
In the present embodiment, the operating frequency of electricity-saving lamp is between the 40KHz-100KHz, and its power reduces along with the increase of frequency, is nonlinear change.After energy-saving lamp tube was lighted, modulating voltage remained unchanged substantially, so lamp power such as depends primarily at electric current.When lamp current during, increase frequency less than preset value; Otherwise reduce frequency, thereby reach the purpose of light modulation.
Consult Fig. 7, the light-dimming method in the present embodiment may further comprise the steps: (111) microcontroller U1 reads phase sample signal voltage Vphase by the cut testing circuit; (112) table look-up or calculate the cut angle of described phase sample signal voltage Vphase correspondence; (113) calculate the power (or luminosity) that to regulate according to described cut goniometer; (114) control half-bridge output frequency; (115) repeating step (111)-(114) reach up to photometric output numerical value are set.
In the present embodiment, the output frequency of half-bridge is between 40KHz-100KHz.
By this light-dimming method, the dimming scope of electric ballast of the present invention is 100%-20%, and omnidistance flicker free.
Fig. 8 is the schematic diagram of an embodiment of electricity-saving lamp universal lamp holder of the present invention.Universal lamp holder 500 of the present invention comprises socket 502 and built-in ballasts and the electricity-saving lamp plug that is used to insert power supply.Ballast in the present embodiment does not repeat them here as previously mentioned.Because present embodiment separates ballast and fluorescent tube 506, makes the fluorescent tube of number of different types can use same lamp socket.
In another embodiment of electricity-saving lamp universal lamp holder of the present invention, this ballast and electricity-saving lamp plug are integral structure, are convenient to install and the replacing fluorescent tube.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (16)
1. an energy-saving lamp electronic ballast is characterized in that, comprising:
Filtering and rectification circuit are connected with AC power;
The cut testing circuit, an end links to each other with the output of described rectification circuit;
Power factor correction circuit, described power factor correction circuit links to each other with the output of described rectification circuit, and described power factor correction circuit comprises half-bridge, and described half-bridge is in series by two switching transistors;
Resonant circuit, described resonant circuit one end links to each other with the output of described half-bridge, and the other end links to each other with fluorescent tube;
Control circuit, described control circuit links to each other with the other end of described cut testing circuit and links to each other with the control end of described switching transistor, and described control circuit is controlled the break-make of described switching transistor and the output frequency of described half-bridge by the detection signal of described cut testing circuit.
2. energy-saving lamp electronic ballast as claimed in claim 1 is characterized in that: described control circuit comprises control unit and half-bridge drive circuit, and described control unit is controlled described half-bridge by described half-bridge drive circuit.
3. energy-saving lamp electronic ballast as claimed in claim 2, it is characterized in that: described half-bridge drive circuit comprises transformer, the input of described transformer links to each other with described control circuit, and the output of described transformer links to each other with the control end of described switching transistor respectively.
4. energy-saving lamp electronic ballast as claimed in claim 1 is characterized in that: also comprise being used to detect the fluorescent tube testing circuit whether fluorescent tube is installed, described fluorescent tube testing circuit links to each other with described fluorescent tube with described control unit.
5. energy-saving lamp electronic ballast as claimed in claim 1 is characterized in that: also comprise the lamp current sense circuit that is used for sensed lamp current, described control circuit is controlled the output frequency of described half-bridge according to the detection signal of described lamp current sense circuit.
6. as each described energy-saving lamp electronic ballast of claim 1-5, it is characterized in that: described power factor correction circuit also comprises first diode, second diode, first electric capacity, second electric capacity, first inductance and storage capacitor, described storage capacitor is in parallel with described half-bridge, described first electric capacity and second capacitances in series are between described rectification circuit, the tie point of described first electric capacity and second electric capacity links to each other with the output of described half-bridge by described first inductance, and the other end of described first electric capacity and second electric capacity links to each other with the two ends of described storage capacitor with described second diode by described first diode respectively.
7. energy-saving lamp electronic ballast as claimed in claim 6 is characterized in that: described switching transistor is a field effect transistor.
8. energy-saving lamp electronic ballast as claimed in claim 6 is characterized in that: described control unit is microcontroller or integrated circuit (IC).
9. energy-saving lamp electronic ballast as claimed in claim 6 is characterized in that: the detection signal of described cut testing circuit is the phase sample signal voltage.
10. energy-saving lamp electronic ballast as claimed in claim 6 is characterized in that: described output frequency is 40KHz-100KHz.
11. an electricity-saving lamp universal lamp holder is characterized in that: lamp socket, electric ballast and electricity-saving lamp plug, described electric ballast comprises:
Filtering and rectification circuit are connected with AC power;
The cut testing circuit, an end links to each other with the output of described rectification circuit;
Power factor correction circuit, described power factor correction circuit links to each other with the output of described rectification circuit, and described power factor correction circuit comprises half-bridge, and described half-bridge is in series by two switching transistors;
Resonant circuit, described resonant circuit one end links to each other with the output of described half-bridge, and the other end links to each other with fluorescent tube;
Control circuit, described control circuit links to each other with the other end of described cut testing circuit and links to each other with the control end of described switching transistor, and described control circuit is controlled the break-make of described switching transistor and the output frequency of described half-bridge by the detection signal of described cut testing circuit.
12. electricity-saving lamp universal lamp holder as claimed in claim 11, it is characterized in that: described power factor correction circuit also comprises first diode, second diode, first electric capacity, second electric capacity, first inductance and storage capacitor, described storage capacitor is in parallel with described half-bridge, described first electric capacity and second capacitances in series are between described rectification circuit, the tie point of described first electric capacity and second electric capacity links to each other with the output of described half-bridge by described first inductance, and the other end of described first electric capacity and second electric capacity links to each other with the two ends of described storage capacitor with described second diode by described first diode respectively.
13. electricity-saving lamp universal lamp holder as claimed in claim 12 is characterized in that: described switching transistor is a field effect transistor.
14. as each described electricity-saving lamp universal lamp holder of claim 11-13, it is characterized in that: described electric ballast and described plug are integral structure.
15. an electricity-saving lamp light-dimming method is characterized in that, may further comprise the steps:
(1) control unit reads the phase sample signal voltage by the cut testing circuit;
(2) table look-up or calculate and the corresponding cut angle of described phase sample signal voltage;
(3) calculate the power that to regulate according to described cut goniometer;
(4) control half-bridge output frequency;
(5) repetition (1)-(4) reach until photometric output numerical value are set.
16. electricity-saving lamp light-dimming method as claimed in claim 15 is characterized in that: described half-bridge reference frequency output is 40KHz-100KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102184644A CN101404848A (en) | 2008-10-20 | 2008-10-20 | Electronic ballast and general lamp seat having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102184644A CN101404848A (en) | 2008-10-20 | 2008-10-20 | Electronic ballast and general lamp seat having the same |
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| CN101404848A true CN101404848A (en) | 2009-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008102184644A Pending CN101404848A (en) | 2008-10-20 | 2008-10-20 | Electronic ballast and general lamp seat having the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281694A (en) * | 2011-06-10 | 2011-12-14 | 惠州雷士光电科技有限公司 | Electronic ballast and automatic hot-restarting circuit thereof |
| CN102595751A (en) * | 2012-02-21 | 2012-07-18 | 胡志强 | Double-line intelligent dimming ballast |
| CN101778524B (en) * | 2009-09-02 | 2012-12-05 | 海洋王照明科技股份有限公司 | Fluorescent lamp dimming control circuit and dimmable fluorescent lamp thereof |
| CN103260292A (en) * | 2012-02-17 | 2013-08-21 | 欧司朗股份有限公司 | Drive circuit for load and luminous device comprising the drive circuit |
| CN103792491A (en) * | 2014-01-22 | 2014-05-14 | 浙江精雷电器有限公司 | Storage battery state display device |
-
2008
- 2008-10-20 CN CNA2008102184644A patent/CN101404848A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778524B (en) * | 2009-09-02 | 2012-12-05 | 海洋王照明科技股份有限公司 | Fluorescent lamp dimming control circuit and dimmable fluorescent lamp thereof |
| CN102281694A (en) * | 2011-06-10 | 2011-12-14 | 惠州雷士光电科技有限公司 | Electronic ballast and automatic hot-restarting circuit thereof |
| CN102281694B (en) * | 2011-06-10 | 2015-05-20 | 惠州雷士光电科技有限公司 | Electronic ballast and automatic hot-restarting circuit thereof |
| CN103260292A (en) * | 2012-02-17 | 2013-08-21 | 欧司朗股份有限公司 | Drive circuit for load and luminous device comprising the drive circuit |
| CN102595751A (en) * | 2012-02-21 | 2012-07-18 | 胡志强 | Double-line intelligent dimming ballast |
| CN102595751B (en) * | 2012-02-21 | 2015-02-18 | 胡志强 | Double-line intelligent dimming ballast |
| CN103792491A (en) * | 2014-01-22 | 2014-05-14 | 浙江精雷电器有限公司 | Storage battery state display device |
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