CN1429059A - Fault protection circuit for electronic balast of fluorescent lamp - Google Patents
Fault protection circuit for electronic balast of fluorescent lamp Download PDFInfo
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- CN1429059A CN1429059A CN 01144874 CN01144874A CN1429059A CN 1429059 A CN1429059 A CN 1429059A CN 01144874 CN01144874 CN 01144874 CN 01144874 A CN01144874 A CN 01144874A CN 1429059 A CN1429059 A CN 1429059A
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Abstract
The protective circuit of oscillation stopping for electronic stabilizer in fluorescent lamp consists of several resonant capacitors, a sampling transformer, a processing circuit of protective signal and a oscillation-stopping circuit as the sampling transformer will separately sample of a normal sampling signal and a fault sampling signal which they two are made into a great deal of difference when lamp tube is in normal and in fault, the protective signal processing circuit will sent out a fault signal when it receives the fault sampling signal and the oscillation-stopping circuit will send out a oscillation-stopping signal to inverter to make it stop working when the oscillation-stopping circuit receives the fault signal.
Description
Technical field
The invention relates to a kind of electric stabilizer of fluorescent lamp, and particularly relevant for a kind of fault protection circuit of electronic fluorescent lamp stabilizer.
Background technology
Lighting apparatus has been the part that people live, thus also more and more higher for the requirement of lighting apparatus, as the flicker that reduces fluorescent tube, the life-span of increase fluorescent tube, luminous efficiency of raising fluorescent tube or the like.In order to reach above-mentioned requirement, electric stabilizer (Electronic Ballast) just accumulates educates and gives birth to.
Electric stabilizer can be with driving single tube daylight or multitube fluorescent lamp, when electric stabilizer when driving the multitube fluorescent lamp, must consider the situation of part fluorescent tube fault.The multitube fluorescent lamp is when operate as normal, and the operating characteristic of each fluorescent tube is relatively more consistent, i.e. the loaded work piece balance, when if the part fluorescent tube breaks down, as lamp tube air leaking, do not start, end of lifetime rectification state and load short circuits etc. because the loaded work piece imbalance can produce a certain amount of fault-signal.
Electric stabilizer at work; when the fluorescent tube fault; the protective circuit of general electric stabilizer is the electric current in sample-power loop; or the voltage on the sampling fluorescent tube; the difference of the curtage signal of being taken a sample when protective circuit is utilized operate as normal and fault is protected; if electric stabilizer is in order to drive the multitube fluorescent lamp; and has only part fluorescent tube fault; then the difference of sampled signal is little when sampled signal just often and part fluorescent tube fault; if consider that again lamp works is under different situations; situation as low-voltage or low temperature; the scope of sampled signal is intersected in the time of then can taking place just often sampled signal with part fluorescent tube fault, can't select the suitable protection action critical value of protective circuit and cause.
Summary of the invention
Therefore the invention provides a kind of fault protection circuit of electronic fluorescent lamp stabilizer, its make just often sampled signal and the sampled signal during part fluorescent tube fault enough big difference is arranged, protective circuit can correctly be moved.
The invention provides a kind of fault protection circuit of electronic fluorescent lamp stabilizer, this electric stabilizer has a converter, and this converter is a square wave power with a direct current power source conversion, and provides this square wave power to several fluorescent tubes.This fault protection circuit comprises several resonant capacitances, a sampling transformer, a guard signal treatment circuit and a failure of oscillation circuit.First end of these resonant capacitances is electrically connected an end of these fluorescent tubes respectively.Sampling transformer has an output winding and several detecting windings, first end of these detecting windings is electrically connected the other end of these fluorescent tubes respectively, second end of these detecting windings is electrically connected second end of these resonant capacitances respectively, this sampling transformer is in order to producing a normal sampled signal and a fault sampled signal, and makes normal sampled signal and fault sampled signal have very big difference.The guard signal treatment circuit is electrically connected the output winding, in order to receiving normal sampled signal and fault sampled signal, and sends a fault-signal when reception fault sampled signal.And the failure of oscillation circuit is electrically connected between guard signal treatment circuit and the converter, when receiving fault-signal, then sends a failure of oscillation signal, so that converter quits work.
Wherein, the failure of oscillation circuit comprises a load resistance, a diode and a gate-controlled switch.Load is electrically connected the anode of DC power supply with first end of resistance; the positive electrical of diode connects converter; and negative electricity connects second end of load with resistance; and; gate-controlled switch has power end, load end and control end; the power end of this gate-controlled switch is electrically connected load second end of resistance and the negative pole of diode, and the load end of this gate-controlled switch is electrically connected the negative terminal of DC power supply, and the control end of this gate-controlled switch is electrically connected the guard signal treatment circuit.The guard signal treatment circuit comprise a diode, a filtering with electric capacity, one first time-delay with resistance, one second time-delay with resistance, a time-delay with electric capacity, a zener diode and an elimination interference electric capacity.The positive electrical of diode connects an end of output winding, filtering is electrically connected the negative pole of diode with first end of electric capacity, and second end is electrically connected the other end of output winding and the negative terminal of DC power supply, first time-delay is electrically connected the negative pole of diode and first end that electric capacity is used in filtering with first end of resistance, second time-delay is electrically connected second end of first time-delay with resistance with first end of resistance, and second end is electrically connected the negative terminal of DC power supply, time-delay uses first end of electric capacity to be electrically connected first end that first time-delay is used resistance with second end and second time-delay of resistance, and second end is electrically connected the negative terminal of DC power supply, the negative electricity of zener diode connects second end of first time-delay with resistance, first end that second time-delay is used electric capacity with first end and the time-delay of resistance, and positive electrical connects the failure of oscillation circuit, and, eliminate and disturb positive pole and the failure of oscillation circuit that is electrically connected zener diode with first end of electric capacity, and second end is electrically connected the negative terminal of DC power supply.
Description of drawings
Fig. 1 is the circuit block diagram of the electric stabilizer of the embodiment of the invention;
Fig. 2 is the circuit block diagram of the another kind of embodiment electric stabilizer of the present invention;
Fig. 3 is the guard signal treatment circuit and the failure of oscillation circuit block diagram of the embodiment of the invention.
Description of reference numerals:
10: electric stabilizer
11: the anode of DC power supply
12: the negative terminal of DC power supply
15: converter
20: drive circuit
21: load resistance
22,33,34,61: diode
23：SCR
25: the failure of oscillation circuit
31,32: commutation switch
35: the square wave output
38: semi bridge type inversion circuit
41: isolated DC electric capacity
42,43: resonant inductance
51,52: fluorescent tube
53,54: resonant capacitance
55,56: the detecting winding
57: the output winding
59: sampling transformer
60: the guard signal treatment circuit
62: filtering electric capacity
63,64: time-delay resistance
65: time-delay electric capacity
66: zener diode
67: eliminate to disturb and use electric capacity
69: fault protection circuit
71: the output of failure of oscillation circuit
73: the output of guard signal treatment circuit
81～84: filament
Embodiment
Electric stabilizer generally includes circuit such as rectification, filtering, the change of current and error protection; the fault protection circuit that present embodiment is carried is the electricity consumption situation of each fluorescent tube of sampling; surpass the action critical value of setting when the signal of being taken a sample after; fault protection circuit quits work converter circuit; to reach the purpose of protection; please refer to Fig. 1, it is the circuit block diagram of embodiment of the invention electric stabilizer.
In Fig. 1; electric stabilizer 10 has a converter (Inverter) 15 and fault protection circuit 69; converter 15 is in order to be converted to square wave power with DC power supply; and square wave power is provided, and (present embodiment is to be example to be applied in two fluorescent tubes to fluorescent tube 51,52; but in fact can be applicable to two more than the fluorescent tube), and fault protection circuit 69 comprises resonant capacitance 53,54, a sampling transformer 59, guard signal treatment circuit 60 and a failure of oscillation circuit 25.Fluorescent tube 51,52 is for being connected in series; second end of the filament 82 of fluorescent tube 51 is electrically connected second end of the filament 83 of fluorescent tube 52; second end of the filament 84 of fluorescent tube 52 is electrically connected the negative terminal 12 of DC power supply; and second end of the filament 81 of fluorescent tube 51 is electrically connected converter 15, and first end of the filament 83 of first end of the filament 81 of fluorescent tube 51, the first end fluorescent tube 52 of filament 82 is electrically connected fault protection circuit 69 respectively with first end of filament 84.
In Fig. 1, converter 15 comprises a bridge-type converter circuit 38, one drive circuit 20, an isolated DC electric capacity 41 and a resonant inductance 42.Semi bridge type inversion circuit 38 (also can use the full-bridge current circuit) is electrically connected fault protection circuit 69, and semi bridge type inversion circuit 38 is converted to square wave power with DC power supply.Drive circuit 20 is electrically connected semi bridge type inversion circuit 38, and drive circuit 20 drives semi bridge type inversion circuit 38.Isolated DC is electrically connected semi bridge type inversion circuit 38 with first end of electric capacity 41, and first end of resonant inductance 42 is electrically connected second end of isolated DC with electric capacity 41, and second end of resonant inductance 42 is electrically connected second end of the filament 81 of fluorescent tube 51.
Wherein, the square wave output 35 of semi bridge type inversion circuit 38 is electrically connected first end of isolated DC with electric capacity 41, and semi bridge type inversion circuit 38 comprises commutation switch 31,32 and diode 33,34.The negative electricity of diode 33 connects the anode 11 of DC power supply, and positive electrical connection side's wave output terminal 35 of diode 33, the negative electricity connection side wave output terminal 35 of diode 34, and the positive electrical of diode 34 connects the negative terminal 12 of DC power supply.The power end of commutation switch 31 is electrically connected the anode 11 of DC power supply, the load end of commutation switch 31 is electrically connected square wave output 35, the control end of commutation switch 31 is electrically connected drive circuit 20, the power end of commutation switch 32 is electrically connected square wave output 35, the load end of commutation switch 32 is electrically connected the negative terminal 12 of DC power supply, and the control end of commutation switch 32 is electrically connected drive circuit.Wherein, commutation switch 31,32 can use two-carrier transistor (Bipolar Transistor) or MOSFET.
In Fig. 1, sampling transformer 59 comprises detecting winding 55,56 and output winding 57, and the winding number of turns of detecting winding 55,56 is identical.The filament 81 of fluorescent tube 51 and first end of the filament 84 of fluorescent tube 52 are electrically connected first end of resonant capacitance 53,54 respectively, second end of resonant capacitance 53,54 is electrically connected second end of detecting winding 55,56 respectively, the filament 82 of fluorescent tube 51 and first end of the filament 83 of fluorescent tube 52 be electrically connected respectively first end of detecting winding 55,56 (in Fig. 1, have annotation "
*" locate).
When fluorescent tube 51,52 just often, then load is a poised state, electric current on detecting winding 55,56 is identical, because the mode that detecting winding 55,56 connects fluorescent tube will make detecting winding 55,56 magnetic fluxs that produced cancel each other, so the voltage on output winding 57 is 0V, even consider the error of sampling transformer 59 itself, the voltage on output winding 57 also is very little.When fluorescent tube 51,52 has at least a fluorescent tube to break down, then load is a non-equilibrium state, electric current on detecting winding 55,56 can be inequality, so detecting winding 55,56 magnetic fluxs that produced can not be cancelled each other, therefore can form a certain amount of voltage on output winding 57.
Guard signal treatment circuit 60 is electrically connected output winding 57; and the voltage that winding 57 is sent is exported in reception; when guard signal treatment circuit 60 can receive a certain amount of voltage; expression fluorescent tube 51,52 has a fluorescent tube fault at least, then sends a fault-signal to failure of oscillation circuit 25 by guard signal treatment circuit 60.Failure of oscillation circuit 25 is connected electrically between guard signal treatment circuit 60 and the converter 15; when failure of oscillation circuit 25 receives the fault-signal that guard signal treatment circuit 60 sent; then failure of oscillation circuit 25 is sent a failure of oscillation signal to converter 15, so that converter 15 quits work.
Fig. 2 is the circuit block diagram of the another kind of embodiment electric stabilizer of the present invention.Fig. 2 is different with Fig. 1 to be in fluorescent tube 51,52 and to make parallel way into by series system, and the filament 82 of fluorescent tube 51 and second end of the filament 84 of fluorescent tube 52 are electrically connected the negative terminal 12 of DC power supply jointly, and increase to two resonant inductances 42,43 by a resonant inductance 42, first end of this resonant inductance 42,43 is electrically connected second end of isolated DC with electric capacity 41 jointly, and second end of resonant inductance 42,43 is electrically connected the filament 81 of fluorescent tube 51 and second end of the filament 83 of fluorescent tube 52 respectively.The operating principle of Fig. 2 is identical with Fig. 1, does not add to give unnecessary details at this.
Fig. 3 is the guard signal treatment circuit and the failure of oscillation circuit block diagram of embodiments of the invention.In Fig. 3, the guard signal treatment circuit comprises a diode 61, filtering electric capacity 62, delays time and use resistance 63,64, a time-delay electric capacity 65, a zener diode 66 and an elimination interference electric capacity 67.
The positive electrical of diode 61 connects output winding 57 (as Fig. 1 or shown in Figure 2), filtering is electrically connected the negative pole of diode 61 with first end of electric capacity 62, and filtering is electrically connected the negative terminal 12 of DC power supply with second end of electric capacity 62, the voltage that has AC signal on the output winding 57 by diode 61 rectifications and filtering with electric capacity 62 filtering after and form a direct current signal.Time-delay is electrically connected the negative pole of diode 61 and first end that electric capacity 62 is used in filtering with first end of resistance 63, time-delay is electrically connected second end of time-delay with resistance 63 with first end of resistance 64, and time-delay is electrically connected the negative terminal 12 of DC power supply with second end of resistance 64, time-delay is electrically connected second end and time-delay first end with resistance 64 of time-delay with resistance 63 with first end of electric capacity 65, and time-delay is electrically connected the negative terminal 12 of DC power supply with second end of electric capacity 65, aforesaid direct current signal is by time-delay resistance 63,64 with time-delay with the time-delay of electric capacity 65, to eliminate because of disturbing and fluorescent tube formation misoperation that laod unbalance was produced when starting.The negative electricity of zener diode (Zener Diode) 66 connects second end, time-delay first end of using resistance 64 and first end of delaying time with electric capacity 65 of delaying time with resistance 63; and the positive electrical of zener diode 66 connects failure of oscillation circuit 25, and zener diode 66 is in order to set the action critical value of protection.Eliminate and disturb positive pole and the failure of oscillation circuit 25 that is electrically connected zener diode 66 with first end of electric capacity 67, disturb the negative terminal 12 that is electrically connected DC power supply with second end of electric capacity 67 and eliminate, eliminate and disturb with electric capacity 67 in order to absorb the interference that the operate as normal circuit is produced.
In Fig. 3, failure of oscillation circuit 25 comprises a load resistance 21, a diode 22 and a SCR 23.Load is electrically connected the anode 11 of DC power supply with first end of resistance 21; the positive electrical of diode 22 connects the control end of the commutation switch 31 of the half-bridge circuit 38 in the converter 15; and the negative electricity of diode 22 connects second end of load with resistance 21; the power end of SCR 23 is electrically connected load second end of resistance 21 and the negative pole of diode 22; the load end of SCR 23 is electrically connected the negative terminal 12 of DC power supply, and the control end of SCR 23 is electrically connected the positive pole and first end of elimination interference with electric capacity 67 of the zener diode 66 in the guard signal treatment circuit 60.
Therefore; when the part fluorescent tube breaks down; after sufficiently high voltage being arranged and keeps the regular hour on the output winding 57; the reverse biased that is higher than zener diode 66 in time-delay with the voltage on the electric capacity 65; make zener diode 66 reverse-conductings, and form a high voltage signal at the output 73 of guard signal treatment circuit 60.The output 73 of guard signal treatment circuit 60 is connected to the control end of the SCR 23 in the failure of oscillation circuit 25; this high voltage signal makes SCR 23 conductings; because load is connected the anode 11 of DC power supply and the power end of SCR 23 with resistance 21; therefore SCR 23 still keeps conducting; so the output 71 of failure of oscillation circuit 25 is kept the voltage near 0V.The control end of the commutation switch 31 of half-bridge circuit 38 makes no longer conducting of commutation switch 31 behind the voltage of output 71 outputs near 0V that receives failure of oscillation circuit 25, so converter circuit 15 reaches the purpose of failure of oscillation.When external power source was turned off, the voltage of DC power supply descended, then no longer conducting of SCR 23.If the fluorescent tube fault is eliminated, after externally power supply was opened again, electric stabilizer 10 (with reference to figure 1) is operate as normal again.
The present invention also is useful in two fluorescent tubes above series connection and application in parallel; need only change the number of turns ratio of detecting winding in the sampling transformer; can make the voltage on the output winding when operate as normal is 0V; and when part fluorescent tube fault takes place, because of laod unbalance makes the voltage on the output winding raise to protect.
Therefore, feature of the present invention be make fluorescent tube just often sampled signal and the sampled signal during part fluorescent tube fault enough big difference is arranged, fault protection circuit can correctly be moved.
In sum, though the present invention with the embodiment explanation as above, so it is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention, when can being used for a variety of modifications and variations, so protection scope of the present invention is when being as the criterion with claims.
Claims (15)
1. the fault protection circuit of an electronic fluorescent lamp stabilizer, this electric stabilizer has a converter, and this converter is a square wave power with a direct current power source conversion, and provides this square wave power to a plurality of fluorescent tubes, and it is characterized by: this fault protection circuit comprises:
A plurality of resonant capacitances, its first end is electrically connected an end of those fluorescent tubes respectively;
One sampling transformer, have an output winding and an a plurality of detecting winding, first end of those detecting windings is electrically connected the other end of those fluorescent tubes respectively, second end of those detecting windings is electrically connected second end of those resonant capacitances respectively, this sampling transformer is in order to producing a normal sampled signal and a fault sampled signal, and makes this normal sampled signal and this fault sampled signal have very big difference;
One guard signal treatment circuit is electrically connected this output winding, in order to this normal sampled signal of reception and this fault sampled signal, and sends a fault-signal when receiving this fault sampled signal; And
One failure of oscillation circuit is electrically connected between this guard signal treatment circuit and this converter, when receiving this fault-signal, then sends a failure of oscillation signal, so that this converter quits work.
2. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 1 is characterized by: this failure of oscillation circuit also comprises:
One load resistance, its first end is electrically connected the anode of this DC power supply;
One diode, its positive electrical connects this converter, and negative electricity connects second end of this load with resistance; And
One gate-controlled switch; have power end, load end and control end; the power end of this gate-controlled switch is electrically connected this load second end of resistance and the negative pole of this diode; the load end of this gate-controlled switch is electrically connected the negative terminal of this DC power supply, and the control end of this gate-controlled switch is electrically connected this guard signal treatment circuit.
3. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 2 is characterized by: this gate-controlled switch is a SCR.
4. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 1 is characterized by: this guard signal treatment circuit also comprises:
One diode, its positive electrical connect an end of this output winding;
One filtering electric capacity, its first end is electrically connected the negative pole of this diode, and second end is electrically connected the other end of this output winding and the negative terminal of this DC power supply;
One first time-delay uses resistance, its first end to be electrically connected the negative pole of this diode and first end that electric capacity is used in this filtering;
One second time-delay uses resistance, its first end to be electrically connected second end of this first time-delay with resistance, and second end electrically connects the negative terminal of this DC power supply;
One time-delay uses electric capacity, its first end to be electrically connected first end that this first time-delay is used resistance with second end and this second time-delay of resistance, and second end is electrically connected the negative terminal of this DC power supply;
One zener diode, its negative electricity connect this first time-delay second end, this second first end of delaying time and using electric capacity with first end and this time-delay of resistance with resistance, and positive electrical connects this failure of oscillation circuit; And
One eliminate to disturb and to use electric capacity, its first end to be electrically connected positive pole and this failure of oscillation circuit of this zener diode, and second end is electrically connected the negative terminal of this DC power supply.
5. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 1 is characterized by: those fluorescent tubes have one first filament and one second filament respectively.
6. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 5; it is characterized by: when those fluorescent tubes are series connection; be electrically connected second end of this first filament of next fluorescent tube by second end of this second filament of first fluorescent tube; connect in regular turn; be electrically connected the negative terminal of this DC power supply to second end of this second filament of last fluorescent tube, and second end of this first filament of first fluorescent tube is electrically connected this converter.
7. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 6 is characterized by: this converter also comprises:
One bridge-type converter circuit is electrically connected this failure of oscillation circuit, in order to this DC power supply is converted to this square wave power;
One drive circuit is electrically connected this bridge-type converter circuit, in order to drive this bridge-type converter circuit;
One isolated DC electric capacity, its first end is electrically connected this bridge-type converter circuit; And
One resonant inductance, its first end are electrically connected second end of this isolated DC with electric capacity, and second end is electrically connected second end of this first filament of first fluorescent tube.
8. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 7 is characterized by: this bridge-type converter circuit is the either-or of a semibridge system converter circuit and a full-bridge current circuit.
9. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 8 is characterized by: a square wave output of this semi bridge type inversion circuit is electrically connected first end of this isolated DC with electric capacity, and this semi bridge type inversion circuit also comprises:
One first diode, its negative electricity connects the anode of this DC power supply, and positive electrical connects this square wave output;
One second diode, its negative electricity connect this square wave output, and positive electrical connects the negative terminal of this DC power supply;
One first commutation switch, have power end, load end and control end, the power end of this first commutation switch is electrically connected the anode of this DC power supply, and the load end of this first commutation switch is electrically connected this square wave output, and the control end of this first commutation switch is electrically connected this drive circuit; And
One second commutation switch, have power end, load end and control end, the power end of this second commutation switch is electrically connected this square wave output, and the load end of this second commutation switch is electrically connected the negative terminal of this DC power supply, and the control end of this second commutation switch is electrically connected this drive circuit.
10. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 9 is characterized by: this first commutation switch and this second commutation switch are to select one among a two-carrier transistor AND gate one MOSFET.
11. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 5; it is characterized by: when those fluorescent tubes are in parallel; second end of this of those fluorescent tubes first filament is electrically connected this converter respectively, and second end of this of those fluorescent tubes second filament is electrically connected the negative terminal of this DC power supply jointly.
12. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 11 is characterized by: this converter also comprises:
One bridge-type converter circuit is electrically connected this failure of oscillation circuit, in order to this DC power supply is converted to this square wave power;
One drive circuit is electrically connected this bridge-type converter circuit, in order to drive this bridge-type converter circuit;
One isolated DC electric capacity, its first end is electrically connected this bridge-type converter circuit; And
A plurality of resonant inductances, first end of those resonant inductances are electrically connected second end of this isolated DC with electric capacity jointly, and second end of those resonant inductances is electrically connected second end of this first filament of those fluorescent tubes respectively.
13. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 12 is characterized by: this bridge-type converter circuit is the either-or of a semibridge system converter circuit and a full-bridge current circuit.
14. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 13 is characterized by: a square wave output of this semi bridge type inversion circuit is electrically connected first end of this isolated DC with electric capacity, and this semi bridge type inversion circuit also comprises:
One first diode, its negative electricity connects the anode of this DC power supply, and positive electrical connects this square wave output;
One second diode, its negative electricity connect this square wave output, and positive electrical connects the negative terminal of this DC power supply;
One first commutation switch, have power end, load end and control end, the power end of this first commutation switch is electrically connected the anode of this DC power supply, and the load end of this first commutation switch is electrically connected this square wave output, and the control end of this first commutation switch is electrically connected this drive circuit; And
One second commutation switch, have power end, load end and control end, the power end of this second commutation switch is electrically connected this square wave output, and the load end of this second commutation switch is electrically connected the negative terminal of this DC power supply, and the control end of this second commutation switch is electrically connected this drive circuit.
15. the fault protection circuit of electronic fluorescent lamp stabilizer as claimed in claim 14 is characterized by: this first commutation switch and this second commutation switch are to select one among a two-carrier transistor AND gate one MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144874 CN1429059A (en) | 2001-12-27 | 2001-12-27 | Fault protection circuit for electronic balast of fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144874 CN1429059A (en) | 2001-12-27 | 2001-12-27 | Fault protection circuit for electronic balast of fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1429059A true CN1429059A (en) | 2003-07-09 |
Family
ID=4677856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01144874 Pending CN1429059A (en) | 2001-12-27 | 2001-12-27 | Fault protection circuit for electronic balast of fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1429059A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1984520B (en) * | 2005-12-15 | 2011-06-29 | 财团法人工业技术研究院 | Modular protector of electronic positioner |
| CN1984521B (en) * | 2005-12-15 | 2011-08-10 | 财团法人工业技术研究院 | Protector of electronic positioner |
| TWI492665B (en) * | 2013-10-11 | 2015-07-11 | 啟耀光電股份有限公司 | Tubular light emitting device |
-
2001
- 2001-12-27 CN CN 01144874 patent/CN1429059A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1984520B (en) * | 2005-12-15 | 2011-06-29 | 财团法人工业技术研究院 | Modular protector of electronic positioner |
| CN1984521B (en) * | 2005-12-15 | 2011-08-10 | 财团法人工业技术研究院 | Protector of electronic positioner |
| TWI492665B (en) * | 2013-10-11 | 2015-07-11 | 啟耀光電股份有限公司 | Tubular light emitting device |
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