CN201042098Y - A current excitation and no magnetic loop feedback rectifier - Google Patents
A current excitation and no magnetic loop feedback rectifier Download PDFInfo
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- CN201042098Y CN201042098Y CNU2006201374898U CN200620137489U CN201042098Y CN 201042098 Y CN201042098 Y CN 201042098Y CN U2006201374898 U CNU2006201374898 U CN U2006201374898U CN 200620137489 U CN200620137489 U CN 200620137489U CN 201042098 Y CN201042098 Y CN 201042098Y
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Abstract
The utility model discloses a current excitation feedback type stabilizer without a magnetic ring, which comprises a wave filtering rectification circuit, a switch, as well as a syntonic circuit and a lighting tube loading with capacitance, wherein, the output end of the wave filtering rectification circuit is connected with the input ends of the switch and the syntonic circuit; the output ends of the switch and the syntonic circuit are connected with the lighting tube loading. The utility model comprises a trigger circuit which consists of resistance R1, resistance R2, capacitance C3, a diode D5, and a trigger diode DB3, as well as a half bridge circuit which consists of three electrod tubes Q1 and Q2, and a three winding potential inductive transformator T which consists of a principal winding and two pairs of secondary windings T1 and T2. In the current excitation feedback type stabilizer without a magnetic ring provided in the utility model, the switch and the syntonic circuit both adopt a half bridge circuit with the three electrod tube and match the inductive transformator to realize the drive and feedback, so that the stabilizer has the advantages of no magnetic ring, thereby improving the reliability of the lighting tube loading, at the same time, simplifying the structure of the circuit, having simply production art, and being more advantageous to the miniaturization of the inductive transformator.
Description
Technical field
The utility model relates to a kind of ballast, particularly relates to a kind of current excitation no magnetic loop feedback rectifier.
Background technology
Present integrated electric ballast available on the market, wherein the overwhelming majority is made up of electromagnetic interface filter, rectifier, inverter and tube load.Inverter circuit is to convert the direct voltage after the rectification to high frequency voltage, what be used for that the driving fluorescent lamp pipe makes is luminous, wherein inverter has many types, the most frequently used have half-bridge inversion circuit, flyback inverter circuit, a push-pull inverter, and above inverter circuit is generally realized with magnetic ring transformer.And use magnetic ring transformer to exist following shortcoming:
In the circuit transistorized conducting with by driving by magnetic ring transformer, when extraneous power-supply fluctuation (rise or descend), cause that driving voltage changes, perhaps underexcitation perhaps drives too, causes the triode heating serious, even overheated and burn, reduced the reliability of tube load.
The processing and the coiling of magnet ring are time-consuming, are unfavorable for a large amount of productions.The operating frequency of circuit is subjected to the parameter of magnet ring, Temperature Influence very big, and its numerical value is difficult to control within the specific limits.If frequency range is also had requirement, in a large amount of production, be difficult to accomplish.
In order to reduce the influence of using magnet ring to bring to electric ballast, in the patent No. 99211363.6 of the Chinese utility model patent of authorizing Chinese Academy of Sciences's microelectronics center, disclose " a kind of tool does not have the electricity-saving lamp of magnet ring ballast ", the half-bridge power amplifier of this electricity-saving lamp ballast is realized by field effect transistor, but the production technology of field effect transistor is complicated, and alternative relatively poor; In addition, the driving flow restricter of this electricity-saving lamp ballast realizes by a load transformer, therefore, this drives flow restricter must be connected with inductance L 1, L2 and capacitor C 1, C2 (with reference to figure 1), cause the circuit complexity, cost increases, and also is unfavorable for the miniaturization of electric ballast.
Summary of the invention
Problem to be solved in the utility model is, a kind of current excitation no magnetic loop feedback rectifier is provided, the switch of this electric ballast and resonant circuit adopt the triode half-bridge circuit and cooperate inductive transformer to realize drive feedback, more help the miniaturization of electric ballast.
To achieve these goals, the utility model discloses a kind of current excitation no magnetic loop feedback rectifier, comprise a filter rectifier, a switch and resonant circuit and contain the tube load of electric capacity, wherein:
The output of described filter rectifier is connected with the input of switch and resonant circuit;
The output of described switch and resonant circuit is connected with tube load, it comprises one by resistance R 1, R2, capacitor C 3, diode D5, the circuits for triggering that diac DB3 forms provide the pulse current of starting working to give switch and resonant circuit, one by triode Q1, the half-bridge circuit and one that Q2 and resistance are formed is by main winding T3 and two auxiliary winding T1, the three winding inductance transformer T that T2 constitutes, wherein, the emitter-base bandgap grading of triode Q1 is connected with the collector electrode of Q2 by a resistance R 5, one node S is arranged between the collector electrode of this resistance R 5 and triode Q2, a parallel resistance R1 and a capacitor C 2 between the collector electrode of triode Q1 and the node S, one end of resistance R 1 links to each other with 3 ends of filter rectifier, resistance R 2 and diode D5 and capacitor C 31 end that be connected serially to filter rectifier of the other end by a parallel connection, the positive pole of this diode D5 is connected to the base stage of triode Q2 by a two-way diode DB3, negative pole links to each other with 4 ends of auxiliary winding T1 and 1 end of main winding T3 through the S node, the base stage of triode Q1 links to each other with 3 ends of auxiliary winding T1 by a resistance R 3, the base stage of triode Q2 links to each other with 6 ends of auxiliary winding T2 by a resistance R 4, the emitter-base bandgap grading of triode Q2 is connected with 5 ends of auxiliary winding T2 by a resistance R 6,5 ends of auxiliary winding T2 link to each other so that auxiliary winding T1 with 1 end of filter rectifier, T2 is triode Q1, Q2 provides drive current, and 2 ends of main winding T3 are connected to tube load and capacitor C 5 so that main winding T3 and capacitor C 5 constitute series resonances.
In above-mentioned current excitation no magnetic loop feedback rectifier, described switch and resonant circuit also comprise a resonant capacitance C6, and an end of this resonant capacitance is connected with 2 ends of auxiliary winding T1, and the other end links to each other with 5 ends of auxiliary winding T2.
In above-mentioned current excitation no magnetic loop feedback rectifier, described filter rectifier is a full bridge rectifier, it comprise the inductance of a bridge rectifier, a pair of parallel connection and resistance filter and one with 1 end and the 3 ends electrochemical capacitor C1 in parallel of bridge rectifier, one end of filter is connected with city's AC power by fuse, and the other end connects 4 ends of bridge rectifier.
In above-mentioned current excitation no magnetic loop feedback rectifier, the rectification circuit of described filter rectifier is a voltage doubling rectifing circuit.
In above-mentioned current excitation no magnetic loop feedback rectifier, it also comprises a circuit of power factor correction, and its input links to each other with the output of filter rectifier, and output links to each other with the input of switch resonant circuit.
In above-mentioned current excitation no magnetic loop feedback rectifier, described circuit of power factor correction comprises MOS switching tube VT1, boost inductance L, booster diode VD, output capacitance C0 and APFC controller IC, wherein the end of boost inductance L links to each other with 3 ends of bridge rectifier, the other end links to each other with the collector electrode of triode Q1 by booster diode VD, the negative pole of this diode VD links to each other with 1 end of bridge rectifier by an output capacitance C0, the positive pole of this diode VD links to each other with 1 end of bridge rectifier by a MOS switching tube VT1, and the grid of this MOS switching tube VT1 links to each other with an APFC controller.
In above-mentioned current excitation no magnetic loop feedback rectifier, described tube load comprises a fluorescent tube and capacitor C 4, C5, respectively there are two tie point a, b and a ', b ' in the two ends of this fluorescent tube, one capacitor C 5 and lamp tube ends one contact b in parallel with fluorescent tube, b ' connects, another contact a ' of this fluorescent tube one end links to each other with 2 ends of three winding inductance transformers, and another contact a of this fluorescent tube other end is connected to the collector electrode of triode Q1 by a capacitor C 4.
In above-mentioned current excitation no magnetic loop feedback rectifier, a PTC preheating device also in parallel on the described capacitor C in parallel 5 with fluorescent tube.
In above-mentioned current excitation no magnetic loop feedback rectifier, the main winding of described three winding inductance transformers and the turn ratio of auxiliary winding are between scope 30: 1～400: 1.
In above-mentioned current excitation no magnetic loop feedback rectifier, the resistance of resistance R 5 and R6 equates in the described half-bridge circuit.
The utility model provides a kind of current excitation no magnetic loop feedback rectifier, and its circuit comprises: filtering and rectification circuit; Switch and resonant circuit; Tube load.Wherein, filter circuit is used for eliminating the caused electromagnetic interference of conduction, and rectification circuit is converted to dc pulse moving voltage with alternating voltage; The switch resonant circuit mainly is fed back to triode by the auxiliary winding of inductive transformer provides drive current to form the switch vibration, and the main winding of inductive transformer T and filament capacitance are formed a LC oscillating circuit, and lamp lighting-up is lighted.Common magnet ring feeds back and promotes triode formation vibration because the switch of this ballast and the triode half-bridge circuit of resonant circuit use three winding inductance transformer feedback, make ballast have the advantage of no magnet ring, also simplified simultaneously the structure of circuit, production technology is simple, has improved the reliability of tube load.
Description of drawings
Fig. 1 is the circuit diagram of the ballast of prior art;
Fig. 2 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment one;
Fig. 3 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment two;
Fig. 4 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment three;
Fig. 5 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment four;
Fig. 6 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment five;
Fig. 7 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment six;
Fig. 8 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment seven;
Fig. 9 is the circuit structure diagram of the utility model current excitation no magnetic loop feedback rectifier embodiment eight.
Embodiment
Below in conjunction with accompanying drawing current excitation no magnetic loop feedback rectifier of the present utility model is described further.
See also Fig. 2, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment one, comprise a filter rectifier 10, a switch and resonant circuit 20 and contain the tube load 30 of electric capacity, now be described below.
The output of filter rectifier 10 is connected with the input of switch with resonant circuit 20, it is connected an alternating voltage of input and is converted to dc pulse moving voltage through filtering removal electromagnetic interference with city's AC power, in the present embodiment, filter rectifier 10 is a full bridge rectifier, it comprises a bridge rectifier (D1～D4), the inductance L 0 of a pair of parallel connection and the filter of resistance R 0 and one with 1 end and the 3 ends electrochemical capacitor C1 in parallel of bridge rectifier, one end of filter or be connected 4 ends of other end connection bridge rectifier with city's AC power by a fuse FU resistance.
The output of switch and resonant circuit 20 is connected with tube load 30, it comprises that circuits for triggering of being made up of resistance R 1, R2, capacitor C 3, diode D5, diac DB3 provide the pulse current of starting working to give switch and resonant circuit 20, the three winding inductance transformer T that one half-bridge circuit of being made up of triode Q1, Q2 and resistance that plays power switch and is made of main winding T3 and two auxiliary winding T1, T2, the main winding T3 of transformer T also plays choking effect.Preferably, the turn ratio of its main winding and auxiliary winding is between scope 30: 1～400: 1.In switch and resonant circuit 20, the emitter-base bandgap grading of triode Q1 is connected with the collector electrode of Q2 by a resistance R 5, one node S is arranged between the collector electrode of this resistance R 5 and triode Q2, a parallel resistance R1 and a capacitor C 2 between the collector electrode of triode Q1 and the node S, one end of resistance R 1 links to each other with 3 ends of the rectifier of filter rectifier 10, resistance R 2 and diode D5 and capacitor C 31 end that be connected serially to the rectifier of filter rectifier 10 of the other end by a parallel connection, the positive pole of this diode D5 is connected to the base stage of triode Q2 by a two-way diode DB3, negative pole links to each other with 4 ends of auxiliary winding T1 and 1 end of main winding T3 through the S node, the base stage of triode Q1 links to each other with 3 ends of auxiliary winding T1 by a resistance R 3, the base stage of triode Q2 links to each other with 6 ends of auxiliary winding T2 by a resistance R 4, the emitter-base bandgap grading of triode Q2 is connected with 5 ends of auxiliary winding T2 by a resistance R 6,5 ends of auxiliary winding T2 link to each other so that auxiliary winding T1 with 1 end of the rectifier of filter rectifier 10, T2 is triode Q1, Q2 provides drive current, and 2 ends of main winding T3 are connected to tube load 30 and capacitor C 5 so that main winding T3 and capacitor C 5 constitute series resonances.
See also Fig. 3, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment two, this embodiment contains the circuit of all embodiment one, just in switch and resonant circuit 20, increased by a resonant capacitance C6, one end of this resonant capacitance is connected with 2 ends of main winding T3, and the other end links to each other with 5 ends of auxiliary winding T2.
See also Fig. 4, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment three, the switch of this embodiment is identical with embodiment one with resonant circuit 20 and tube load 30, just in filter rectifier 10, the rectification circuit of the filter rectifier 10 of present embodiment is the voltage doubling rectifing circuit of being made up of diode and two electric capacity.
See also Fig. 5, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment four, this embodiment contains the circuit of all embodiment three, has just increased by a resonant capacitance C6 in switch and resonant circuit 20, and its circuit connecting mode is identical with embodiment two.
See also Fig. 6, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment five, this embodiment also comprises a circuit of power factor correction 40 except the circuit that contains all embodiment one.It should be noted that whether this circuit of power factor correction 40 is installed can select needs according to the required power that reaches of current excitation no magnetic loop feedback rectifier.This circuit input end links to each other with the output of filter rectifier 10, and output links to each other with the input of switch resonant circuit 20.This circuit of power factor correction 40 comprises MOS switching tube VT1, boost inductance L, booster diode VD, output capacitance C0 and APFC controller IC, wherein the end of boost inductance L links to each other with 3 ends of bridge rectifier, the other end links to each other with the collector electrode of triode Q1 by booster diode VD, the negative pole of this diode VD links to each other with 1 end of bridge rectifier by an output capacitance C0, the positive pole of this diode VD links to each other with 1 end of bridge rectifier by a MOS switching tube VT1, and the grid of this MOS switching tube VT1 links to each other with an APFC controller.
See also Fig. 7, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment six, this embodiment contains the circuit of all embodiment five, has just increased by a resonant capacitance C6 in switch and resonant circuit 20, and its circuit connecting mode is identical with embodiment two.
See also Fig. 8, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment seven, this embodiment contains the circuit of all embodiment three, just also comprises a circuit of power factor correction 40, and its circuit connecting mode is identical with connected mode among the embodiment five.
See also Fig. 9, as shown be the current excitation no magnetic loop feedback rectifier of the utility model embodiment eight, this embodiment contains the circuit of all embodiment seven, has just increased by a resonant capacitance C6 in switch and resonant circuit 20, and its circuit connecting mode is identical with embodiment two.
Operation principle of the present utility model is: after adding power supply, the electric current that is provided by direct voltage charges to integrating capacitor C3 through resistance R 1, the R2 of circuits for triggering, in case its voltage meets and exceeds the breakover voltage of diac DB3 (after about 30～40V), this diode breakdown conducting, and have electric current to flow into the base stage of triode Q2, make the Q2 conducting.Increase along with the collector current of triode Q2, on the main winding T3 of inductive transformer, produce induced electromotive force, T1, T2 also produce induced electromotive force on auxiliary winding simultaneously, its polarity is to make on each winding with the end of representing of the same name to just, thereby the base potential of Q2 is raise, base current, collector current further strengthen, and base potential further raises again.Like this, just in circuit, produce chain reaction, and this chain positive feedback effect makes Q2 conducting and saturated.Q2 emitter resistance R6 plays a part Current Negative Three-Point Capacitance in circuit, in the process of chain reaction, the increase of base current makes the pressure drop that produces on R6 also will increase, the increase of pressure drop partly is transmitted back in the base-emitter loop of Q2 and goes, make the outer Q2 base-emitter voltage that is added on reduce, therefore base current also reduces automatically, thereby has pind down the increase of collector current.If strengthen the resistance of emitter resistance R6, then can increase its negative feedback, can improve operating frequency.
After the triode Q2 conducting, along with the increase of flowing through triode Q2 collector current, the situation that voltage on the inductive transformer auxiliary winding T2 is lower than triode Q2 base voltage can appear, make base current reverse, therefore triode Q2 withdraws from from saturation condition, enter magnifying state, in case enter magnifying state, the decline of flowing through triode Q2 collector current reduces base current by the positive feedback of inductive transformer, and collector current further reduces, Q2 soon saltus step for ending, meanwhile, voltage on the inductive transformer auxiliary winding T1 changes polarity, on negative just down, postponed a period of time after, triode Q1 has electric current to produce, inductive transformer opposite induced electromotive force in the time of will producing and increase with the Q2 collector current causes Q1 base stage and collector current further to strengthen, so Q1 is rapidly by by becoming conducting.Q1 emitter resistance R5 plays a part Current Negative Three-Point Capacitance, and its operation principle is identical with R6, and R5, R6 select identical resistance for use in circuit.
Said process repeats down again and again, Q1, Q2 take turns conducting with end, between the mid point of two half-bridges, form the square-wave voltage of alternation, this alternating voltage is through starting capacitor C 5, the series resonance effect of inductive transformer main winding inductance T3, its current waveform becomes near sinusoidal wave, and is added on the fluorescent tube at very high voltage of generation on the C5, thereby lamp lighting-up is lighted.
The above-mentioned the technical solution of the utility model that only is illustrative rather than definitive thereof, those of ordinary skill in the art makes amendment according to the utility model or equivalent replacement, and it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (10)
1. a current excitation no magnetic loop feedback rectifier is characterized in that, comprise a filter rectifier, a switch and resonant circuit and contain the tube load of electric capacity, wherein:
The output of described filter rectifier is connected with the input of switch and resonant circuit;
The output of described switch and resonant circuit is connected with tube load, it comprises one by resistance R 1, R2, capacitor C 3, diode D5, the circuits for triggering that diac DB3 forms provide the pulse current of starting working to give switch and resonant circuit, one by triode Q1, the half-bridge circuit and one that Q2 and resistance are formed is by main winding T3 and two auxiliary winding T1, the three winding inductance transformer T that T2 constitutes, wherein, the emitter-base bandgap grading of triode Q1 is connected with the collector electrode of Q2 by a resistance R 5, one node S is arranged between the collector electrode of this resistance R 5 and triode Q2, a parallel resistance R1 and a capacitor C 2 between the collector electrode of triode Q1 and the node S, one end of resistance R 1 links to each other with 3 ends of filter rectifier, resistance R 2 and diode D5 and capacitor C 31 end that be connected serially to filter rectifier of the other end by a parallel connection, the positive pole of this diode D5 is connected to the base stage of triode Q2 by a two-way diode DB3, negative pole links to each other with 4 ends of auxiliary winding T1 and 1 end of main winding T3 through the S node, the base stage of triode Q1 links to each other with 3 ends of auxiliary winding T1 by a resistance R 3, the base stage of triode Q2 links to each other with 6 ends of auxiliary winding T2 by a resistance R 4, the emitter-base bandgap grading of triode Q2 is connected with 5 ends of auxiliary winding T2 by a resistance R 6,5 ends of auxiliary winding T2 link to each other so that auxiliary winding T1 with 1 end of filter rectifier, T2 is triode Q1, Q2 provides drive current, and 2 ends of main winding T3 are connected to tube load and capacitor C 5 so that main winding T3 and capacitor C 5 constitute series resonances.
2. current excitation no magnetic loop feedback rectifier according to claim 1, it is characterized in that, described switch and resonant circuit also comprise a resonant capacitance C6, and an end of this resonant capacitance is connected with 2 ends of auxiliary winding T1, and the other end links to each other with 5 ends of auxiliary winding T2.
3. current excitation no magnetic loop feedback rectifier according to claim 1, it is characterized in that, described filter rectifier is a full bridge rectifier, it comprise the inductance of a bridge rectifier, a pair of parallel connection and resistance filter and one with 1 end and the 3 ends electrochemical capacitor C1 in parallel of bridge rectifier, one end of filter is connected with city's AC power by fuse, and the other end connects 4 ends of bridge rectifier.
4. current excitation no magnetic loop feedback rectifier according to claim 1 is characterized in that, the rectification circuit of described filter rectifier is a voltage doubling rectifing circuit.
5. current excitation no magnetic loop feedback rectifier according to claim 1 and 2 is characterized in that it also comprises a circuit of power factor correction, and its input links to each other with the output of filter rectifier, and output links to each other with the input of switch resonant circuit.
6. current excitation no magnetic loop feedback rectifier according to claim 5, it is characterized in that, described circuit of power factor correction comprises MOS switching tube VT1, boost inductance L, booster diode VD, output capacitance C0 and APFC controller IC, wherein the end of boost inductance L links to each other with 3 ends of bridge rectifier, the other end links to each other with the collector electrode of triode Q1 by booster diode VD, the negative pole of this diode VD links to each other with 1 end of bridge rectifier by an output capacitance C0, the positive pole of this diode VD links to each other with 1 end of bridge rectifier by a MOS switching tube VT1, and the grid of this MOS switching tube VT1 links to each other with an APFC controller.
7. current excitation no magnetic loop feedback rectifier according to claim 1, it is characterized in that, described tube load comprises a fluorescent tube and capacitor C 4, C5, respectively there are two tie point a, b and a ', b ' in the two ends of this fluorescent tube, one capacitor C 5 and lamp tube ends one contact b in parallel with fluorescent tube, b ' connects, and another contact a ' of this fluorescent tube one end links to each other with 2 ends of three winding inductance transformers, and another contact a of this fluorescent tube other end is connected to the collector electrode of triode Q1 by a capacitor C 4.
8. current excitation no magnetic loop feedback rectifier according to claim 7 is characterized in that, a PTC preheating device also in parallel on the described capacitor C in parallel with fluorescent tube 5.
9. current excitation no magnetic loop feedback rectifier according to claim 1 is characterized in that, the main winding of described three winding inductance transformers and the turn ratio of auxiliary winding are between scope 30: 1～400: 1.
10. current excitation no magnetic loop feedback rectifier according to claim 1 is characterized in that, the resistance of resistance R 5 and R6 equates in the described half-bridge circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201374898U CN201042098Y (en) | 2006-10-27 | 2006-10-27 | A current excitation and no magnetic loop feedback rectifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201374898U CN201042098Y (en) | 2006-10-27 | 2006-10-27 | A current excitation and no magnetic loop feedback rectifier |
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| CN201042098Y true CN201042098Y (en) | 2008-03-26 |
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| CNU2006201374898U Expired - Fee Related CN201042098Y (en) | 2006-10-27 | 2006-10-27 | A current excitation and no magnetic loop feedback rectifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510615A (en) * | 2011-10-25 | 2012-06-20 | 杭州鸿德照明科技有限公司 | Voltage-multiplying rectifying high-voltage power-supplying constant current driving circuit for serially connected LEDs (Light Emitting Diodes) |
-
2006
- 2006-10-27 CN CNU2006201374898U patent/CN201042098Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510615A (en) * | 2011-10-25 | 2012-06-20 | 杭州鸿德照明科技有限公司 | Voltage-multiplying rectifying high-voltage power-supplying constant current driving circuit for serially connected LEDs (Light Emitting Diodes) |
| CN102510615B (en) * | 2011-10-25 | 2014-04-02 | 杭州鸿德照明科技有限公司 | Voltage-multiplying rectifying high-voltage power-supplying constant current driving circuit for serially connected LEDs (Light Emitting Diodes) |
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080326 Termination date: 20111027 |