CN1311715C - Electronic ballast with protector - Google Patents
Electronic ballast with protector Download PDFInfo
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- CN1311715C CN1311715C CNB021226059A CN02122605A CN1311715C CN 1311715 C CN1311715 C CN 1311715C CN B021226059 A CNB021226059 A CN B021226059A CN 02122605 A CN02122605 A CN 02122605A CN 1311715 C CN1311715 C CN 1311715C
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Abstract
The present invention relates to an electronic ballast with a protector. The protector is positioned between a power input end and a main circuit of the electronic ballast, and comprises a voltage division rectifying circuit, a delay circuit, a threshold circuit, a trigger circuit, a switching circuit and a thermal protection circuit, wherein the voltage division rectifying circuit outputs a DC voltage after dividing and rectifying the input sensing voltage, the delay circuit short-circuits the input DC voltage with the ground for 0.2 to 0.5 seconds and then outputs the DC voltage, the threshold circuit outputs a pulse triggering signal through a filter circuit and a secondary threshold circuit when the voltage at both ends of the threshold circuit is higher than the threshold voltage of the threshold circuit, the trigger circuit outputs a switching signal when the pulse triggering signal is input, the switching circuit disconnects the power input end and the main circuit of the ballast when the switching signal is received, and the thermal protection circuit drives the trigger circuit to work so as to cut off power input when the temperature of transistors rises. The protector has the advantages of safety and reliability, and can prevent a lamp tube from aging or avoid the damage to the ballast duo the voltage rise of a power supply.
Description
Technical field
The present invention relates to a kind of electric ballast, particularly a kind of electric ballast that has protective device.
Background technology
In recent years, the electric ballast that is applied to home lighting fluorescent lamp current limliting had come out.Compared with old-fashioned ferromagnetic core Wound-rotor type ballast, it can save 30% with electric energy.Simultaneously, the structure of electric ballast is not too complicated, and raw material also obtains easily.Therefore national governments and power plant all do one's utmost to encourage to replace old-fashioned iron core Wound-rotor type ballast with electric ballast.As a result, in a short period of time, the electric ballast of various brands and model is competitively released market in large quantities.
But the electric ballast life-span originally is but extremely short, and have more than is needed how long electric ballast just can burn.Because this defective, producer is thought because the transistor temperature in the electric ballast is too high, then strengthened the area of semiconductor heat-dissipating sheet, and change the part circuit, and change individual part, the temperature of transistor truly decreases.Electric ballast just puts goods on the market once again, but spent a period of time, the problem that product burns has occurred again, and the spread of voltage of fault from power line thought by producer, low when high during voltage, and cause transistor to puncture from the burst high-voltage pulse that power line transmits and burn.Its solution is to load onto a piezo-resistance at power input, makes high-voltage pulse not remove to endanger transistor at piezo-resistance two terminal shortcircuits.But this way also don't work.Product still burns easily, causes people that electric ballast is lost the confidence gradually.The structure that people think electronic component is too fragile, can't be used for making electric ballast.
In fact, the quality of present electronic devices and components is superior, and it can be used in the various electrical equipment, as: radio station, TV, electronic computer or the like, can use many decades.In these electrical equipment, electronic component quantity is hundreds and thousands of, in harsh environment, and only one or two of damage.
That what reason causes electric ballast to burn? at first should analyze from the structure and the operation principle aspect of electric ballast.According to investigations, the electric ballast of all trades mark on the market, its structure is similar substantially, its circuit structure as shown in Figure 1, as can be seen from Figure 1: transistor Tr
1And transistor Tr
2It is the generation source of the high-frequency current of the about 25KHz of frequency.High-frequency current is from some A coils L1, a coil L, capacitor C and fluorescent lamp Lm, capacitor C
2, transistor Tr
1, resistance R
1And regression point A; And capacitor C
1, resistance R
2, transistor Tr
2Regression point A finishes electric loop.This loop can be reduced to Fig. 2.
According to electrical principles, as can be seen from Figure 2, inductance L, capacitor C form a serial resonant loop.If fluorescent lamp Lm does not exist, during resonance, impedance Z=0 between some A, the some D.At this moment, flowing through the electric current of an A, inductance L, some B, capacitor C, some D will be greatly.Voltage between the two ends (some B, some D) of two ends of inductance L (some A, some B) and capacitor C is with high.
If with the two ends access point B and some D of fluorescent lamp Lm, the electric current that flows into capacitor C will be told part inflow fluorescent lamp Lm.Now, the voltage of capacitor C two ends (some B, some D), i.e. V
BD, with the voltage of inductance L two ends (some B, some A), i.e. V
BA, it is inequality that its phase place will become.V
BA-V
BDTo be not equal to 0, this looks like in other words: the impedance between some A and the some D will not be 0, and the electric current of an A that flows through will not be greatly and to some extent to reduce C both end voltage V
BDThe electric current of fluorescent lamp Lm of also will being flowed through limits and decreases.
The low resistance of new fluorescent tube Lm similar about 250 Ω when work.Fluorescent lamp Lm two is terminated at a B and some D, the induction reactance at inductance coil L two ends and the capacitive reactance X at electric capacity two ends
L-X
CBe not equal to 0, this time point B and some D are that the voltage at capacitor C two ends will get because of the gas conduction physical characteristic of fluorescent lamp Lm and be maintained at the balance steady state for a long time.If fluorescent lamp Lm is 40W, then voltage is approximately about 100V.This moment the transistor Tr of flowing through
1, transistor Tr
2Electric current with constant and can not surpass safety value.
After fluorescent lamp Lm worked one section long time, its filament electron emission ability lowered gradually, and inert gas conductive ion number also and then reduces in the fluorescent tube.The fluorescent tube conductive capability reduces, and becomes a high value resistor gradually.The voltage at capacitor C two ends increases thereupon, LC series resonant circuit middle impedance X
L-X
CGradually level off to 0, the transistor Tr of flowing through
1, transistor Tr
2Electric current become gradually greatly, finally surpass point of safes, cause the capacitor C both end voltage too high and capacitor C is punctured, and electric current is excessive transistor Tr
1, transistor Tr
2Burn.
Can be clearly seen that now: be that old and feeble fluorescent tube causes electric ballast to burn.In average about 8000 hours of the life-span of every fluorescent tube, in other words: unless the filament of fluorescent tube blows earlier, the life-span of each electric ballast will be no more than 8000 hours.If the ballast of usefulness is old-fashioned coiling, when fluorescent tube was old and feeble, two ends glowed, and what danger the flicker of light and dark does not then bring to ballast, if usefulness is electric ballast, fluorescent tube flashes quick and frequent.The fluorescent tube that also do not have enough time to change, electric ballast has burnt.
If the lamp foot socket of fluorescent lamp adopts unsuitable made, use after a period of time, will cause the lamp base loose contact because of following the string or corrosion, glimmer when bright when making fluorescent tube with putting out.Though this moment, fluorescent tube was not old and feeble, and electric ballast is burnt.
Summary of the invention
The purpose of this invention is to provide a kind of electric ballast that has protective device; it is exempted from because of fluorescent tube is old and feeble burns; in the danger of electric ballast experience; power supply circuits are cut off; the safety of protection ballast main circuit; after this, only must change new fluorescent tube, this electric ballast just can operate as normal.
Another object of the present invention provides a kind of electric ballast that has protective device, it is exempted from because supply power voltage is too high, causes by lamp tube current and by excessive the burning out of causing of the electric current of semiconductor transistor.
For realizing purpose of the present invention, a kind of electric ballast that has protective device is provided, this protective device is between power input and electric ballast main circuit, this protective device comprises: divide voltage rectifier, this circuit receives the sensing voltage from ballast output end or lamp tube ends, and, export a direct current voltage through dividing potential drop and rectification; Delay circuit is used for when starting working, and will after this section time delay, again direct voltage be delivered to threshold circuit from the direct voltage of dividing potential drop rectification circuit and ground short circuit 0.2-0.5 second; Threshold circuit, the direct voltage of this circuit receive delay circuit input when described direct voltage makes the voltage at threshold circuit two ends be higher than the threshold voltage of threshold circuit, is exported a pulse triggering signal; Filter circuit, the pulse triggering signal of this filter circuit threshold level circuit output, elimination is very brief, the spuious impulse wave of high-amplitude, and output one is pulse triggering signal stably; The accept filter pulse triggering signal of circuit output of second level threshold circuit, this threshold circuit when the voltage of this triggering signal is higher than threshold voltage, is exported a pulse triggering signal and is given circuits for triggering; Circuits for triggering, when a pulse triggering signal is imported, this circuits for triggering work, and export a switching signal and give switching circuit; Switching circuit, it links to each other with the main circuit of ballast with the power supply input, and when receiving the switching signal of automatic triggering circuit, the powered-down input is connected with the ballast main circuit; Thermal protection circuit; the output of this protective circuit links to each other with the input of described threshold circuit; and contain the thermistor of at least one positive temperature coefficient; when the transistorized temperature in the electric ballast raises; its output voltage increases gradually, when being higher than threshold voltage, makes gate circuit export a triggering signal; wave circuit and second level threshold circuit make circuits for triggering work after filtration, thereby block the input power supply.
The described electric ballast that protective device is arranged; wherein said switching circuit comprises thyristor and at least two resistance; the anode of thyratron links to each other with power input; negative electrode links to each other with the main circuit of ballast; described at least two resistance string are associated between anode and the gate; the intermediate node of two resistance links to each other with the anode of circuits for triggering; when circuits for triggering are triggered; the current potential that makes node between two resistance is an earth potential; thyratron is ended, and power circuit is not powered to the main circuit of ballast.
The described electric ballast that protective device is arranged; wherein said thermal protection circuit comprises: be close on the transistor semistor and with it series connection with the high resistance measurement that links to each other of input power supply, between the input point of the tie point of thermistor and described high resistance measurement and threshold circuit, be connected a clamping diode.
As seen from the above; a kind of electric ballast that has protective device provided by the invention; when because of the fluorescent tube aging; electric ballast meets with in the danger; can cut off power supply circuits; thereby the safety of protection ballast main circuit only need be changed new fluorescent tube, and this electric ballast just can operate as normal.Circuits for triggering particularly of the present invention and switching circuit use thyristor, can save electric energy effectively.Simultaneously; for protecting owing to the too high damage that causes of the nonstandard and supply power voltage in the fluorescent tube manufacture process to ballast; special design has thermal protection circuit, can avoid causing for above-mentioned reasons pass through lamp tube current and by the excessive phenomenon that burns out ballast of the electric current of semiconductor transistor.
Description of drawings
Fig. 1 is the basic diagram of existing electric ballast;
The operation principle that Fig. 2 simplifies for electric ballast;
Fig. 3 is the circuit theory diagrams that have the electric ballast of protective device;
Fig. 4 is the circuit structure diagram of an embodiment of protective device of the present invention.
Embodiment
Fig. 3 is the circuit theory diagrams that have the electric ballast of protective device, and from this schematic diagram as can be seen: it has a kind of electric ballast that has protective device.Protective circuit is installed between power supply circuits and the ballast main circuit; have sensing circuit in the protective device; be used for detecting the voltage of fluorescent lamp two ends lamp base; when the fluorescent lamp aging; two ends lamp base voltage increases is during to dangerous spot, and sensing circuit monitors dangerous voltage, just the trigger protection circuit; ballast main body and power pack are disconnected, play the purpose of protection electric ballast like this.
Be example with the 40W fluorescent lamp below, under normal circumstances, the voltage between some D, the some B is approximately 100V (some D voltage extremely is approximately 10-20 and lies prostrate more), in the aging of fluorescent lamp pipe, the voltage between some B, the some D will raise, if voltage is higher than 160-170V, and permanent maintenance, transistor Tr
1And transistor Tr
2Promptly be damaged.We just protect electric ballast with this voltage between a B, the some D as sensing voltage conversely.This sensing voltage is from a M process capacitor C
3, some P enters protective device, trigger point F
1, F
2Between the circuit of original conducting, make its disconnection, the protection electric ballast is not burnt.
In addition, because the fluorescent tube of various brands has the substandard situation of manufacturing on the market, the filament in glass tube, metallic support or tube wall exist other gas or contaminating impurity, or poorly sealed, slight gas leakage etc.These fluorescent tubes are after using a period of time, and the conductive ion in the pipe in the indifferent gas obviously increases, and cause voltage between the lamp tube ends to drop to and be lower than 40-50V, the obvious deepening of lighting tube brightness this moment, lamp current but rolls up, and the result causes and flows through transistor Tr
1, transistor Tr
2Electric current surpass point of safes and transistor Tr
1, transistor Tr
2Burn.
It is the overtension (being higher than 250V) of power supply electric line that another one causes the electric ballast deadline factor, makes to roll up by lamp tube current, and this moment, lighting tube brightness was strong unusually.Transistor Tr
1, transistor Tr
2In electric current also roll up thereby the safety value that surpass to allow thereupon.Two kinds of situations of aftermentioned are different from aforementioned normal fluorescent tube aging, the voltage drop of promptly putting between B and the some D does not raise, but reduce on the contrary, transistor does not damage immediately in such cases, the damage time will see that the electric current that passes through causes transistorized temperature to surpass safe temperature and decides, sometimes several minutes, a few days sometimes.Because of lamp tube ends voltage does not raise, sensing circuit originally can't detect, and for this reason, the present invention places on the transistor as another group sensing element with for example two positive resistance coefficient thermistor PTC1 and PCT2 respectively, thereby has solved this problem.
Fig. 4 is operation principle and the circuit structure diagram of an embodiment of electronic ballast protection device of the present invention, and this protective device circuit comprises eight modules as can be seen from Figure 4, and the function of each module is described in detail as follows:
Module 1: module 1 is for dividing voltage rectifier.Reception is input to the alternating voltage that P is ordered from the M point through capacitor C 3, and through dividing potential drop and rectification, exports a direct current voltage.If fluorescent tube is 40W, under the normal condition, will there be the alternating voltage of volt more than 100 to enter module 1 during work by a P, through electric resistance partial pressure, behind diode rectification, draw the direct voltage of about more than 20 volts.If the alternating voltage that P is ordered is increased to volt more than 170, then the direct voltage after the rectification is with 40 volts of height to 30 as many as.
Module 2: module 2 is a delay circuit.Be 0.2-0.5 second its time of delay, and it mainly acts on and being: when the fluorescent lamp starting point is bright, in the time less than 0.1 second, between some B and the some D two ends, a string up to the alternating voltage more than the 300V with producing.If allow this string high-voltage pulse act on protective circuit, then it cuts off the path between power supply and the ballast main circuit with the circuit of trigger module 6 with module 7, and electric ballast is quit work.Therefore, when fluorescent tube began to conduct electricity, voltage and ground short circuit exporting after module 1 rectification made it be in zero potential, approximately rose to normal current potential after 0.2 to 0.5 second.What use herein is monostable multiplex circuit, and perhaps the applying frequency counting circuit also can.
After module 2 postpones for example about 0.5 second, promptly enter module 3 from the voltage of module 1 output.
Module 3: module 3 is threshold circuits, and its main element is a two-way trigger switch diode (DIAC).This element is used for deboost, must just allow electric current to pass through when two end electrodes surpasses 32V.If surpass assigned voltage from the voltage of module 2 output, i.e. 32V, its electric current just will enter module 4 by this switching diode, and export a pulse triggering signal.
Module 4: module 4 is filter circuits; in order to improve the reliability of this protective device; prevent that the very brief high voltage pulse that produces because of the switch of other electrical equipment from may touch circuits for triggering; increase by a filter circuit; it will enter the high voltage pulse elimination that time is short and pressing from module 3; if there is not this circuit, then as long as switch normal domestic use such as electric fan, electric light electrical equipment once, thyristor Th that just may trigger module 6
1Electric ballast is quit work.
Module 5: module 5 is second level threshold circuits, and its function is to prevent that some unforeseen stray voltages from removing the thyristor Th of trigger module 6
1Only allow high signal voltage extremely to a certain degree pass through, thus the unfailing performance of strict guarantee circuit.
Module 6: module 6 is circuits for triggering.Be a thyristor (SCR).This element is a kind of in the semiconductor transistor family, but its working method and common half conduit transistor and inequality.It also has three electrodes, i.e. anode (A), gate (G) and negative electrode (K).Anode (A) connects positive potential; Gate (G) is a trigger electrode; Negative electrode (K) earthing potential.If gate does not have signal to trigger, then not conducting of electric current between anode and the negative electrode.If gate has signal voltage to trigger, keep just flow through the electric current of anode and negative electrode, no longer be subjected to the influence of gate.Cut off this electric current and will be reduced to it and keep under the electric current (Holdcurrent), perhaps remove power supply.Utilize this operating characteristic:, triggered the thyristor Th of module 6 when trigger voltage from module 5
1Gate (G) afterwards, one direct current is just arranged from putting F
1Through resistance R
A, resistance R
GBetween contact flow to thyristor Th
1Anode (A), go into ground through negative electrode (K) again.Make resistance R
A, resistance R
GBetween contact be in earth potential.Make thyristor Th
1Quit work, must cut-out point F
1Circuit or turn off power supply.
Module 7: module 7 is a switching circuit.One little electric current is arranged through resistance R during work
AAnd resistance R
GRemove to trigger thyristor Th
2Gate (G), make thyristor Th
2Conduction, thyristor Th
2Anode current just offer the electric ballast main body, make whole system work.Thyristor Th when module 6
1Be triggered, will remove the thyristor Th in the trigger module 7 originally
2The electric current of gate (G) is just through thyristor Th
1Anode (A), negative electrode (K) go into ground, making does not have electric current to remove to trigger thyristor Th
2Under normal circumstances, the alternating current that enters from power supply electric line by rectification after, become the Rectified alternating current that direct current and 100Hz alternating current mix.This strand Rectified alternating current is connected to thyristor Th
2Anode (A), make its resistance R of flowing through again
AAnd resistance R
GRemove to trigger thyristor Th
2Gate (G), make this strand Rectified alternating current from a F
1Through thyristor Th
2Anode (A), negative electrode (K) flow to some F
2If flow through resistance R
AElectric inflow place, do not have the electric current resistance R of flowing through
GRemove to trigger thyristor Th
2Gate (G), F then
1To F
2Path will be cut off, so just protected electric ballast not burnt.
As seen from the above; by above-mentioned module can finish since the undesired rising of lamp tube ends voltage cause to ballast the protection of damage; but in order to protect overtension because of power supply electric line; make by lamp tube current and roll up; thereby make the electric current that flows through in the ballast transistor along with increase; and damage transistorized situation, also can increase module 8.
Module 8: module 8 is thermal protection circuits, and the work of this circuit is protective transistor Tr
1With transistor Tr
2Can Yin Wendu do not surpass point of safes and burn.In a preferred embodiment, semistor PTC
1Be close to transistor Tr
1On, thermistor PTC
2Be close to transistor Tr
2On.Resistance R
3Be the resistance of a high value.Under the normal temperature situation, thermistor PTC
1With thermistor PTC
2Be in low resistance state, S point current potential is very low.If transistor Tr
1With transistor Tr
2Heat is to surpassing temperature point of safes, thermistor PTC
1With thermistor PTC
2Resistance just and then increase to tens of megaohms, make electric current from a F
1Or some F
2Through resistance R
3, the some S, thermistor PTC
1, thermistor PTC
2Inflow place then.Voltage between some S and the ground will be increased to more than the 34V.
The effect of diode Dp is a unidirectional electronic switch.Be higher than a S if put the voltage of K, diode Dp makes it be higher than a S voltage of holding point K.Be higher than the voltage of a K as the voltage of fruit dot S, electric current will flow to a K through diode Dp from a S, and a K voltage is raise, and will be high to reaching the thyristor Th of trigger module 6 by the two-way trigger switch diode (DIAC) of module 3
1, cut off thyristor Th in the module 7
2Anode current, make from F
1Flow to F
2Current interruptions.Thereby protected semiconductor transistor not damage because of overheated.
Obviously, the effect of module 8 also is to prevent to cause owing to aforesaid fluorescent tube product is substandard voltage between the lamp tube ends to reduce to make the obvious deepening of lighting tube brightness, lamp current but rolls up, the result burns electric ballast accident to take place.
In sum; the present invention has provided detailed embodiment and has been used for illustrating the present invention program; yet for a person skilled in the art; can carry out various modifications within the spirit and scope of the present invention; can realize with being different from circuit of the present invention as some modules; and this protective device is applied to different electric pressures, for example be applied to the voltage of 110 volts of 60Hz.Therefore, the change of structurally visibly different modification and embodiment and variation will can not depart from the scope of the present invention.Content and the accompanying drawing mentioned in describing in front only are used to furnish an explanation.So the description of front should be thought illustrative rather than be used for limiting the present invention.
Claims (6)
1. electric ballast that protective device is arranged, this protective device is characterized in that this protective device comprises between power input and electric ballast main circuit:
Divide voltage rectifier, this circuit receives the voltage from ballast output end or lamp tube ends, and through dividing potential drop and rectification, exports a direct current voltage;
Delay circuit is used for when starting working, and will after this section time delay, again direct voltage be delivered to threshold circuit from the direct voltage of dividing potential drop rectification circuit and ground short circuit 0.2-0.5 second;
Threshold circuit, the direct voltage of this circuit receive delay circuit input when described direct voltage makes the voltage at threshold circuit two ends be higher than the threshold voltage of threshold circuit, is exported a pulse triggering signal;
Filter circuit, the pulse triggering signal of this filter circuit threshold level circuit output, elimination is very brief, the spuious impulse wave of high-amplitude, and output one is pulse triggering signal stably;
The accept filter pulse triggering signal of circuit output of second level threshold circuit, this threshold circuit when the voltage of this triggering signal is higher than threshold voltage, is exported a pulse triggering signal and is given circuits for triggering;
Circuits for triggering, when a pulse triggering signal is imported, this circuits for triggering work, and export a switching signal and give switching circuit;
Switching circuit, it links to each other with the main circuit of ballast with the power supply input, and when receiving the switching signal of automatic triggering circuit, the powered-down input is connected with the ballast main circuit;
Thermal protection circuit; the output of this protective circuit links to each other with the input of described threshold circuit; and contain the thermistor of at least one positive temperature coefficient; when the transistorized temperature in the electric ballast raises; its output voltage increases gradually, when being higher than threshold voltage, makes gate circuit export a triggering signal; wave circuit and second level threshold circuit make circuits for triggering work after filtration, thereby block the input power supply.
2. the electric ballast that protective device is arranged as claimed in claim 1; it is characterized in that described circuits for triggering comprise a thyristor; its gate receives the pulse triggering signal of input; negative electrode links to each other with earth potential; anode links to each other with switching circuit; when gate receives a pulse triggering signal, this thyratron conducting, the voltage that makes anode is earth potential.
3. the electric ballast that protective device is arranged as claimed in claim 1; it is characterized in that described switching circuit comprises thyristor and at least two resistance; the anode of thyratron links to each other with power input; negative electrode links to each other with the main circuit of ballast; described at least two resistance string are associated between anode and the gate; the intermediate node of two resistance links to each other with the anode of circuits for triggering; when circuits for triggering are triggered; the current potential that makes node between two resistance is an earth potential; thyratron is ended, and power circuit is not powered to the main circuit of ballast.
4. the electric ballast that protective device is arranged as claimed in claim 1 is characterized in that described delay circuit is a monostable multiplex circuit or a frequency counting circuit.
5. the electric ballast that protective device is arranged as claimed in claim 1 is characterized in that described threshold circuit is a two-way trigger switch diode.
6. the electric ballast that protective device is arranged as claimed in claim 1; it is characterized in that described thermal protection circuit comprises: be close on the transistor semistor and with it series connection with the high resistance measurement that links to each other of input power supply, between the input point of the tie point of thermistor and described high resistance measurement and threshold circuit, be connected a clamping diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021226059A CN1311715C (en) | 2002-06-18 | 2002-06-18 | Electronic ballast with protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021226059A CN1311715C (en) | 2002-06-18 | 2002-06-18 | Electronic ballast with protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1466407A CN1466407A (en) | 2004-01-07 |
| CN1311715C true CN1311715C (en) | 2007-04-18 |
Family
ID=34142252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021226059A Expired - Fee Related CN1311715C (en) | 2002-06-18 | 2002-06-18 | Electronic ballast with protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1311715C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0063507A1 (en) * | 1981-04-03 | 1982-10-27 | Mazda Eclairage | Electronic starter for fluorescent lamps comprising a time delay circuit cooperating with an overvoltage circuit and a preheating circuit |
| CN2235185Y (en) * | 1995-07-12 | 1996-09-11 | 庄晓虹 | Electronic ballast with protector at abnormal state |
| CN1194569A (en) * | 1997-03-25 | 1998-09-30 | 宝岩产业株式会社 | Circuit for protecting fluorescent lamp from overload |
-
2002
- 2002-06-18 CN CNB021226059A patent/CN1311715C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0063507A1 (en) * | 1981-04-03 | 1982-10-27 | Mazda Eclairage | Electronic starter for fluorescent lamps comprising a time delay circuit cooperating with an overvoltage circuit and a preheating circuit |
| CN2235185Y (en) * | 1995-07-12 | 1996-09-11 | 庄晓虹 | Electronic ballast with protector at abnormal state |
| CN1194569A (en) * | 1997-03-25 | 1998-09-30 | 宝岩产业株式会社 | Circuit for protecting fluorescent lamp from overload |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1466407A (en) | 2004-01-07 |
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