CN102695347B - Power supply circuit for electronic ballast control chip - Google Patents
Power supply circuit for electronic ballast control chip Download PDFInfo
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- CN102695347B CN102695347B CN201110069605.2A CN201110069605A CN102695347B CN 102695347 B CN102695347 B CN 102695347B CN 201110069605 A CN201110069605 A CN 201110069605A CN 102695347 B CN102695347 B CN 102695347B
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Abstract
The invention relates to a power supply circuit for an electronic ballast control chip, comprising an EMI filter circuit, a rectifying circuit, a power factor correction circuit, a ballast control circuit, an output-level circuit and a chip power-supply circuit, wherein the input end Net1 of the chip power-supply circuit is connected with the output-level circuit, and is sequentially connected with a coupling capacitance C1 and a rectifier diode D1; the cathode of the rectifier diode D1 is sequentially connected with a rectifier diode D2, a filter capacitance C2, and is respectively connected with an adjusting triode Q1 collector and one end of a resistor R1; the other end of the resistor R1 is respectively connected with the adjusting triode Q1 base, a stabilizing diode Z1 cathode and a stabilizing diode Z2 cathode; the adjusting triode Q1 emitter sequentially is connected with the adjusting triode Q1 base through a current-limiting resistor R2 and the stabilizing diode Z2; and the stabilizing diode Z2 anode is respectively connected with the other end of a resistor R3, an energy storage capacitance C3 anode and an output VCC.
Description
[technical field]
The present invention relates to a kind of circuit of electronic ballast, relate in particular to a kind of power supply circuits of electronic ballast control chip, be applied to the electronic ballast for fluoresent lamp of series resonance working method.
[background technology]
The circuit of electronic ballast of mature and reliable, generally all can use professional electronic ballast control chip at present, as L6574D, and IR21592 etc., the pfc circuit of front end adopts professional PFC control chip, and conventional chip is as L6561, UC3854, MC34262 etc.
But, for electric ballast chip used provides stable power supply, be the key that is related to ballast monolithic stability reliably working.Although adopt the reliable still high cost of special power control circuit, and make ballast piece electrical Efficiency Decreasing, adopt simple power supply circuits can have influence on again the reliability of circuit.
Prior art as shown in Figure 1, comprise EMI filter circuit 101, rectification circuit 102, circuit of power factor correction 103, power supply chip 104, ballast control circuit 105 and output-stage circuit 106, it adopts power supply chip, add peripheral circuit and form chip power supply circuit, for PFC chip and ballast control chip provide power supply, also have partial PFC chip power supply power acquisition to power with the auxiliary winding of PFC inductance.
The shortcoming of foregoing circuit comprise following some:
The first, adopt power supply chip supply power mode, cost is higher;
The second, when after circuit abnormal, although circuit enters after protection by abnormity protection circuit, electric ballast can not damage, and PFC chip and ballast control chip still, in work, have increased stand-by power consumption;
The 3rd, adopt power supply chip supply power mode, because circuit structure complexity increases, ballast piece electrical efficiency can reduce.
Therefore, prior art needs to improve.
[summary of the invention]
In view of this, be necessary to propose a kind of power supply circuits of electronic ballast control chip.
A technical scheme of the present invention is, a kind of power supply circuits of electronic ballast control chip, and it comprises EMI filter circuit, rectification circuit, circuit of power factor correction, ballast control circuit, output-stage circuit and chip power supply circuit; EMI filter circuit input current, carries out sending to rectification circuit after filtering; Rectification circuit carries out sending to circuit of power factor correction after rectification; The output of circuit of power factor correction, output DC power supply is to resistance R 3 one end of output-stage circuit and chip power supply circuit; The output VCC of chip power supply circuit, is connected to the power input of circuit of power factor correction and the power input of ballast control circuit; Ballast control circuit, is connected to output-stage circuit;
In chip power supply circuit, its input Net1 is connected with output-stage circuit, input Net1 butt coupling capacitor C 1 one end, and the other end of coupling capacitance C1 is connected with rectifier diode D1 negative electrode, rectifier diode D1 plus earth; Rectifier diode D1 negative electrode also be connected rectifier diode D2 anodic bonding, rectifier diode D2 negative electrode and filter capacitor C2 are anodal to be connected, filter capacitor C2 minus earth; Rectifier diode D1 negative electrode is also connected with resistance R 1 one end with adjustment triode Q1 collector electrode respectively, and resistance R 1 other end is connected with adjustment triode Q1 base stage, zener diode Z1 negative electrode and zener diode Z2 negative electrode respectively; Zener diode Z1 plus earth; Adjust triode Q1 emitter and connect successively current-limiting resistance R2, zener diode Z2 anode, zener diode negative electrode is connected with adjustment triode Q1 base stage; Zener diode Z2 anode is also connected with the output VCC of resistance R 3 other ends, storage capacitor C3 positive pole and chip power supply circuit respectively; Storage capacitor C3 minus earth.
Be applied to such scheme, in described power supply circuits, output-stage circuit comprises inductance L 1, capacitor C 4, capacitor C 5, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor; The input Net1 of chip power supply circuit is connected with one end, metal-oxide-semiconductor Q3 source electrode and the metal-oxide-semiconductor Q4 drain electrode of the inductance L 1 of output-stage circuit respectively; The output of circuit of power factor correction, output DC power supply is to the metal-oxide-semiconductor Q3 drain electrode of output-stage circuit; Metal-oxide-semiconductor Q4 source ground; The other end of inductance L 1 is exported after connecting with capacitor C 4.
Be applied to such scheme, in described power supply circuits, also comprise capacitor C 5, capacitor C 5 one end connect capacitor C 4 and inductance L 1 successively, other end ground connection, and capacitor C 5 is in parallel with external loading.
Be applied to such scheme, in described power supply circuits, the input Net1 of chip power supply circuit, is connected with the metal-oxide-semiconductor Q3 source electrode that inductance L 1 is connected of output-stage circuit and one end of metal-oxide-semiconductor Q4 drain electrode.
Be applied to above-mentioned each scheme, in described power supply circuits, adopt the tie point of resistance R 3 other ends and storage capacitor C3 positive pole as the output VCC of chip power supply circuit.
Be applied to above-mentioned each scheme, in described power supply circuits, the output VCC of chip power supply circuit, is connected to the power pins VCC of PFC control chip of circuit of power factor correction and the power pins VCC of the ballast control chip of ballast control circuit.
Be applied to such scheme, in described power supply circuits, storage capacitor C3 negative pole is also connected altogether with metal-oxide-semiconductor Q4 source electrode.
Be applied to above-mentioned each scheme, in described power supply circuits, the output of circuit of power factor correction is output as direct current 400V.
Such scheme, by simple discrete component compositing chip power supply circuits, saves circuit cost, and in the time there is abnormality, PFC control chip and ballast control chip quit work, and stand-by power consumption is extremely low, saves energy; Meanwhile, this chip power supply circuit has the function of abnormal protection, can effectively avoid circuit to break down time, damages ballast, safer; Can also realize fluorescent tube protection not in place, make electric ballast more reliable; Because this circuit has the function of abnormal protection, can save the abnormity protection circuit of traditional circuit, can further reduce circuit cost, economic benefit is high.
[accompanying drawing explanation]
Fig. 1 is the circuit diagram of prior art;
Fig. 2 is the circuit diagram of one embodiment of the invention;
Fig. 3 is the circuit theory schematic diagram of Fig. 2.
[embodiment]
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
As shown in Figure 2, one embodiment of the present of invention are, power supply circuits for electronic ballast control chip, it comprises EMI filter circuit 201, rectification circuit 202, circuit of power factor correction 203, ballast control circuit 205, output-stage circuit 206 and chip power supply circuit 204.As shown in Figure 3, the 201 access power supplies of EMI filter circuit, send to rectification circuit 202 after filtering, carry out, after rectification, sending to circuit of power factor correction 203, and output DC power supply is to chip power supply circuit 204 and output-stage circuit 206; And ballast control circuit 205 also outputs to output-stage circuit 206; Output-stage circuit 206 outputs to chip power supply circuit 204, and chip power supply circuit 204 provides VCC to ballast control circuit 205 and circuit of power factor correction 203.
Wherein, as shown in Figure 2, EMI filter circuit 201 input currents, carry out sending to rectification circuit 202 after filtering; For example, EMI filter circuit 201 accesses external communication electricity, as conventional input AC electricity of 220V etc.Then, carry out, after rectification, sending to circuit of power factor correction 203 via rectification circuit 202.For example, rectification circuit 202 can adopt bridge diode rectification circuit etc.
Circuit of power factor correction 203 is at its output, and output DC power supply is to resistance R 3 one end of output-stage circuit 206 and chip power supply circuit 204; Circuit of power factor correction 203 can adopt APFC 203 to obtain better output effect, preferably, adopt the output VCC of chip power supply circuit 204, for example, by the output VCC of chip power supply circuit 204, be connected to the power pins VCC of the PFC control chip of circuit of power factor correction 203, like this, both combine, can effectively realize the power supply effect of the present embodiment, in the time there is abnormality, PFC control chip just can quit work in time, stand-by power consumption is extremely low, with saves energy.Preferably, as shown in Figure 2, the output of circuit of power factor correction 203 is output as direct current 400V.
As shown in Figure 2, the output VCC of chip power supply circuit 204, is connected to the power input of circuit of power factor correction 203 and the power input of ballast control circuit 205; And ballast control circuit 205, is connected to output-stage circuit 206.
Be applied to above-mentioned each example, as shown in Figure 2, in chip power supply circuit 204, the input Net1 of chip power supply circuit 204 is connected with output-stage circuit 206.
And, input Net1 butt coupling capacitor C 1 one end, the coupling capacitance C1 other end is connected with rectifier diode D1 negative electrode, and, rectifier diode D1 plus earth.
Meanwhile, rectifier diode D1 negative electrode also with rectifier diode D2 anodic bonding, rectifier diode D2 negative electrode and filter capacitor C2 are anodal to be connected, and, filter capacitor C2 minus earth.
Meanwhile, rectifier diode D1 negative electrode is also connected with resistance R 1 one end with adjustment triode Q1 collector electrode respectively, and resistance R 1 other end is connected with adjustment triode Q1 base stage, zener diode Z1 negative electrode and zener diode Z2 negative electrode respectively; And, zener diode Z1 plus earth.
Adjust triode Q1 emitter and connect successively current-limiting resistance R2, zener diode Z2 anode, zener diode Z2 negative electrode is connected with adjustment triode Q1 base stage; And zener diode Z2 anode is also connected with the output VCC of resistance R 3 other ends, storage capacitor C3 positive pole and chip power supply circuit 204 respectively; Storage capacitor C3 minus earth.For example, zener diode Z1 negative electrode connects after being connected with filter capacitor C2 negative pole altogether.Preferably, storage capacitor C3 negative pole is connected altogether with filter capacitor C2 and rectifier diode D1 anode.
Be applied to above-mentioned each example, preferred, as shown in Figure 2, in described power supply circuits, output-stage circuit 206 comprises inductance L 1, capacitor C 4, capacitor C 5, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor; The input Net1 of chip power supply circuit 204 is connected with one end, metal-oxide-semiconductor Q3 source electrode and the metal-oxide-semiconductor Q4 drain electrode of the inductance L 1 of output-stage circuit 206 respectively; Circuit of power factor correction is at its output, and output DC power supply is to the metal-oxide-semiconductor Q3 drain electrode of output-stage circuit 206; Metal-oxide-semiconductor Q4 source ground; The other end of inductance L 1 is exported after connecting with capacitor C 4.For example, the other end of inductance L 1 is series capacitance C4, capacitor C 5 successively, and capacitor C 5 is in parallel with external loading.Preferably, the input Net1 of chip power supply circuit 204, is connected with the metal-oxide-semiconductor Q3 source electrode that inductance L 1 is connected of output-stage circuit 206 and one end of metal-oxide-semiconductor Q4 drain electrode.
Be applied to above-mentioned each example, preferred, in described power supply circuits, adopt the tie point of resistance R 3 other ends and storage capacitor C3 positive pole as the output VCC of chip power supply circuit 204.Another example is, in described power supply circuits, the output VCC of chip power supply circuit 204, is connected to the power pins VCC of PFC control chip of circuit of power factor correction 203 and the power pins VCC of the ballast control chip of ballast control circuit 205.
Be applied to above-mentioned each example, preferred, in described power supply circuits, zener diode Z1 negative electrode connects after being connected with filter capacitor C2 negative pole altogether.And for example, storage capacitor C3 negative pole is connected altogether with filter capacitor C2 and rectifier diode D1 anode.Or storage capacitor C3 negative pole is also connected altogether with metal-oxide-semiconductor Q4 source electrode.An example is that all earth elements all connect altogether, in the product of specific implementation, contribute to wiring setting like this.
Above-mentioned each example, need not be used abnormity protection circuit, has solved prior art and has adopted power supply chip supply power mode, the problem that cost is higher; Also having solved when after circuit abnormal, still, in work, there is higher stand-by power consumption problem in PFC chip and ballast control chip; Again by reference to the accompanying drawings, further by embodiment, structure of the present invention and function are described below.
As shown in Figure 2, the present embodiment comprises 6 parts, comprise EMI filter circuit 201, rectification circuit 202, circuit of power factor correction 203, ballast control circuit 205, output-stage circuit 206 and chip power supply circuit 204, key point is the improvement of chip power supply circuit 204.For example, AC220V civil power, through EMI filter circuit 201, to rectification circuit 202, then to circuit of power factor correction 203, becomes direct current 400V.Direct current 400V is as the input of the Q3 drain electrode d of output-stage circuit 206, and the input of R3 in chip power supply circuit 204.And ballast control circuit 205, is connected to output-stage circuit 206; The output stage VCC of chip power supply circuit 204, is connected to the power pins VCC of PFC control chip and ballast control chip; The input Net1 of chip power supply circuit 204 is connected to the common intersection of the drain electrode d of the inductance L 1 of output-stage circuit 206 and the source electrode s of Q3 and Q4; The input termination coupling capacitance C1 of chip power supply circuit 204, another pin of C1 is connected with D2 anode with rectifier diode D1 negative electrode, D1 plus earth.D2 negative electrode is connected with filter capacitor C2 is anodal, is connected in simultaneously and adjusts the pipe collector electrode of Q1 and one end of R1, the minus earth of filter capacitor C2.Adjust the base stage of pipe and the other end of R1 and be connected, connect the negative electrode of zener diode Z1 and Z2, the plus earth of voltage-stabiliser tube Z1 simultaneously.The emitter of adjusting pipe Q1 is connected with current-limiting resistance R2 one end, and the other end of R2 is connected with the anode of voltage-stabiliser tube Z2, is connected to the intersection point of resistance R 3 and storage capacitor C3 simultaneously, and this is as the output VCC of chip power supply circuit 204.Storage capacitor C3 minus earth, the output of another termination power factor correction circuit of R3.
Above-mentioned each example of the present invention, the chip power supply circuit 204 being formed by several discrete components by ingenious setting, not only solve employing power supply chip supply power mode, the problem that cost is higher, also solve when after circuit abnormal, still, in work, there is higher stand-by power consumption problem in PFC chip and ballast control chip; Can also realize the function of abnormal protection, can save the abnormity protection circuit of traditional circuit, further reduce costs simultaneously.If do not remove abnormity protection circuit, form duplicate protection, make circuit of electronic ballast more safe and reliable.Its operation principle is described as follows: in the time that circuit is connected 220V alternating current, not yet work at powered on moment PFC control chip and ballast control chip, now the voltage of the output of power factor correction circuit is close to rectification circuit 202 output voltage 311V, this voltage is storage capacitor C3 charging by current-limiting resistance R3, when storage capacitor C3 voltage rises to after the threshold voltage of PFC control chip and ballast control chip, PFC control chip and ballast control chip moment start, direct voltage is reverse into sinusoidal ac by half-bridge inversion circuit Q3 and Q4, offer resonant inductance L1, series resonant circuit produces vibration, the sinusoidal ac of Net1 is coupled capacitor C 1 and is coupled, through diode D1, diode D2 rectification, become half-wave, after capacitor C 2 filtering, become direct current.Adjust pipe Q1 and resistance R 1 and voltage-stabiliser tube Z1 composition linear voltage-stabilizing circuit, output voltage values equals voltage-stabiliser tube Z1 value and deducts the be junction voltage of adjusting pipe Q1.Adjust pipe output voltage and provide stable power supply for PFC control chip and ballast control chip after by current-limiting resistance R2.PFC control chip and ballast control chip start steady operation, normally light fluorescent tube.The inverter voltage waveform that now Net1 is ordered tends towards stability, and chip power supply circuit 204 also starts steady operation, continuous for PFC control chip and ballast control chip provide power supply, as shown in Figures 2 and 3.
If output stage breaks down in powered on moment or work, while open circuit such as fluorescent tube, for example do not connect fluorescent tube or fluorescent tube disconnects suddenly, the series resonant circuit Net1 generation high voltage pulse of naming a person for a particular job, this high pressure moment inputs to voltage stabilizing circuit after being coupled capacitive coupling, voltage stabilizing circuit causes output current moment to increase because voltage raises, current-limiting resistance R2 is because electric current is excessive, pressure drop moment is elevated, cause the emitter voltage of triode Q1 to be raised by moment, but the base voltage of triode Q1 is by zener diode Z2 pressure limiting, when the emitter voltage of triode Q1 exceeds base voltage, voltage stabilizing circuit quits work, now VCC voltage is not because having supply supply voltage to be dragged down, lower than the threshold voltage of PFC control chip and ballast control chip, two chip blocks quit work.And then cause again half-bridge inversion circuit to quit work, and at this moment Net1 point inverter voltage disappears, the coupling of coupling capacitance no-voltage, and chip power supply circuit 204 also will quit work reliably.Circuit is protected by safety.Therefore, during due to generation abnormality, PFC control chip and ballast control chip quit work, so stand-by power consumption is extremely low.Power supply circuits have abnormity protection function in addition, can replace the independent abnormity protection circuit of traditional circuit.
The present invention designs by the topological structure of circuit of electronic ballast and concrete chip power supply circuit 204, can realize following effect: 1, by simple discrete component compositing chip power supply circuits 204, save circuit cost; 2, while there is abnormality, PFC control chip and ballast control chip quit work, and stand-by power consumption is extremely low, saves energy; 3, this chip power supply circuit 204 has the function of abnormal protection, can effectively avoid circuit to break down time, damages ballast, safer; 4, can realize fluorescent tube protection not in place by this circuit, make electric ballast more reliable; 5, there is the function of abnormal protection because of this circuit, can save the abnormity protection circuit of traditional circuit, can further reduce circuit cost.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention; And, each technical characterictic listed above, it mutually combines and can form each embodiment, should be regarded as belonging to the scope that specification of the present invention is recorded.For the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. power supply circuits for electronic ballast control chip, comprise EMI filter circuit, rectification circuit, circuit of power factor correction, ballast control circuit, output-stage circuit and chip power supply circuit;
EMI filter circuit input current, carries out sending to rectification circuit after filtering;
Rectification circuit carries out sending to circuit of power factor correction after rectification;
The output of circuit of power factor correction, output DC power supply is to resistance R 3 one end of output-stage circuit and chip power supply circuit;
The output VCC of chip power supply circuit, is connected to the power input of circuit of power factor correction and the power input of ballast control circuit;
Ballast control circuit, is connected to output-stage circuit;
It is characterized in that, in chip power supply circuit,
Its input Net1 is connected with output-stage circuit, input Net1 butt coupling capacitor C 1 one end, and the other end of coupling capacitance C1 is connected with rectifier diode D1 negative electrode, rectifier diode D1 plus earth;
Rectifier diode D1 negative electrode also with rectifier diode D2 anodic bonding, rectifier diode D2 negative electrode and filter capacitor C2 are anodal to be connected, filter capacitor C2 minus earth;
Rectifier diode D2 negative electrode is also connected with resistance R 1 one end with adjustment triode Q1 collector electrode respectively, and resistance R 1 other end is connected with adjustment triode Q1 base stage, zener diode Z1 negative electrode and zener diode Z2 negative electrode respectively;
Zener diode Z1 plus earth;
Adjust one end of triode Q1 emitter connection current-limiting resistance R2, the other end connection zener diode Z2 anode of current-limiting resistance R2, zener diode Z2 negative electrode is connected with adjustment triode Q1 base stage;
Zener diode Z2 anode is also connected with the output VCC of resistance R 3 other ends, storage capacitor C3 positive pole and chip power supply circuit respectively;
Storage capacitor C3 minus earth.
2. power supply circuits according to claim 1, is characterized in that, output-stage circuit comprises inductance L 1, capacitor C 4, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4;
The input Net1 of chip power supply circuit is connected with one end, metal-oxide-semiconductor Q3 source electrode and the metal-oxide-semiconductor Q4 drain electrode of the inductance L 1 of output-stage circuit respectively;
The output of circuit of power factor correction, output DC power supply is to the metal-oxide-semiconductor Q3 drain electrode of output-stage circuit;
Metal-oxide-semiconductor Q4 source ground;
The other end of inductance L 1 is exported after connecting with capacitor C 4.
3. power supply circuits according to claim 2, is characterized in that, output-stage circuit also comprises capacitor C 5, and capacitor C 5 one end are connected with one end of capacitor C 4, other end ground connection, and capacitor C 5 is in parallel with external loading.
4. power supply circuits according to claim 3, is characterized in that, the input Net1 of chip power supply circuit is connected with the metal-oxide-semiconductor Q3 source electrode that inductance L 1 is connected of output-stage circuit and one end of metal-oxide-semiconductor Q4 drain electrode.
5. power supply circuits according to claim 1, is characterized in that, adopt the tie point of resistance R 3 other ends and storage capacitor C3 positive pole as the output VCC of chip power supply circuit.
6. power supply circuits according to claim 5, it is characterized in that, the output VCC of chip power supply circuit, is connected to the power pins VCC of PFC control chip of circuit of power factor correction and the power pins VCC of the ballast control chip of ballast control circuit.
7. power supply circuits according to claim 2, is characterized in that, zener diode Z1 anode connects after being connected with filter capacitor C2 negative pole altogether.
8. power supply circuits according to claim 7, is characterized in that, storage capacitor C3 negative pole is connected altogether with filter capacitor C2 and rectifier diode D1 anode.
9. power supply circuits according to claim 8, is characterized in that, storage capacitor C3 negative pole is also connected altogether with metal-oxide-semiconductor Q4 source electrode.
10. according to the arbitrary described power supply circuits of claim 1 to 9, it is characterized in that, the output of circuit of power factor correction is output as direct current 400V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110069605.2A CN102695347B (en) | 2011-03-22 | 2011-03-22 | Power supply circuit for electronic ballast control chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110069605.2A CN102695347B (en) | 2011-03-22 | 2011-03-22 | Power supply circuit for electronic ballast control chip |
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| CN102695347A CN102695347A (en) | 2012-09-26 |
| CN102695347B true CN102695347B (en) | 2014-05-21 |
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| CN201110069605.2A Expired - Fee Related CN102695347B (en) | 2011-03-22 | 2011-03-22 | Power supply circuit for electronic ballast control chip |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103327710B (en) * | 2013-04-15 | 2015-02-18 | 张根清 | Solar energy power source injection locking power synthesis light-dimmer electrodeless lamp |
| CN103313496B (en) * | 2013-06-17 | 2016-01-20 | 武汉迪奥尔照明有限责任公司 | A kind of high-performance low distortion electronic ballast |
| CN109861217B (en) * | 2019-03-13 | 2022-08-19 | 上海源微电子科技有限公司 | Novel chip power supply circuit |
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| CN1430458A (en) * | 2001-12-19 | 2003-07-16 | 尼古拉斯·伯埃诺肯托 | Electronic ballast system with emergency lighting apparatus |
| TW200926898A (en) * | 2007-12-12 | 2009-06-16 | World Light Lighting Technology Co Ltd | Electronic ballast with a stable preheat circuit |
| CN101772250A (en) * | 2010-02-08 | 2010-07-07 | 海洋王照明科技股份有限公司 | Dimmable electronic ballast |
| CN101945524A (en) * | 2010-09-29 | 2011-01-12 | 海洋王照明科技股份有限公司 | Electronic ballast and lamp |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430458A (en) * | 2001-12-19 | 2003-07-16 | 尼古拉斯·伯埃诺肯托 | Electronic ballast system with emergency lighting apparatus |
| TW200926898A (en) * | 2007-12-12 | 2009-06-16 | World Light Lighting Technology Co Ltd | Electronic ballast with a stable preheat circuit |
| CN101772250A (en) * | 2010-02-08 | 2010-07-07 | 海洋王照明科技股份有限公司 | Dimmable electronic ballast |
| CN101945524A (en) * | 2010-09-29 | 2011-01-12 | 海洋王照明科技股份有限公司 | Electronic ballast and lamp |
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