CN1652658A - Abnormal state protector for electronic ballast - Google Patents
Abnormal state protector for electronic ballast Download PDFInfo
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- CN1652658A CN1652658A CN 200410015287 CN200410015287A CN1652658A CN 1652658 A CN1652658 A CN 1652658A CN 200410015287 CN200410015287 CN 200410015287 CN 200410015287 A CN200410015287 A CN 200410015287A CN 1652658 A CN1652658 A CN 1652658A
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- circuit
- relay
- fluorescent tube
- electric ballast
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Abstract
The protector is composed of sampling circuit, control circuit, circuit for turning on/off lamp tube and holding circuit. When abnormal state of not started lamp occurs, operation of fluorescent lamp is stopped and maintained rapidly. Defective fluorescent lamp is pulled out, and disconnected circuit is maintained. A tube in good condition is replaced so that lamp is operated normally again. When two or more tubes are installed on one piece of electronic ballast, if only one tube is in defective, then its lamp circuit is protected, and other tubes are operated normally and will not be affected. Moreover, adjusting power for these operated tubes is carried out to make tubes operate in rated operation.
Description
Technical field
The present invention relates to a kind of electron ballast abnormality state protection technology, especially electronic ballast for fluorescent lamps abnormal condition protection technology.
Background technology
The output operating frequency of electric ballast is generally more than 20Khz; and fluorescent lamp is worked under high frequency and can be improved system's light efficiency about 30%; it is the important technique measure of energy-saving illumination; therefore the development of electronic ballast for fluorescent lamps and production just are subjected to extensive attention both domestic and external from the eighties; in two standards of IEC928, IEC929 of International Electrotechnical Commission's promulgation, automatic protection has all proposed corresponding requirement to the electron ballast abnormality state.Abnormality described in the related standards is mainly following two kinds: a kind of is the lamp open circuit, and another kind is that lamp does not start.Be equivalent to resonant tank and be cut off under the lamp open-circuit condition, at this moment electric ballast can not be damaged.Lamp not starting state normally causes because of fluorescent tube is aging or the gas leakage filament is intact again.Because at this moment the transistor operating current in the electric ballast is much larger than running current, so the time may be burnt transistor once long.In order to prevent the generation of this phenomenon, usually the abnormality automatic safety device to be set in electric ballast.The Electronic Protection circuit of substantially all forming that electric ballast adopted that has at present the abnormal condition protection device on the market by transistor; shown in Figure 1 is a kind of reliable abnormal state protection circuit; be characterized in that driving transformer T increases a winding Td; under the normality, the current potential deficiency that resitstance voltage divider M is ordered makes Zener diode puncture conducting.Controllable silicon SCR is turn-offed, once abnormality occurs, P point certainly leads to a very high electromotive force, needs only M point current potential and reaches 10V, and Zener diode is with regard to conducting, makes the SCR conducting that is triggered.The electric current that winding Td produces arrives ground by speed-sensitive switch diode and SCR, and the switch-off power switching transistor quits work switching circuit simultaneously.At this moment, if take off the fluorescent tube of damage, change intact fluorescent tube again, because abnormal state protection circuit still is in the protection operating state, so fluorescent tube can not be lighted, reclose power supply again after having only power cutoff, electric ballast just can be reworked.If two or two above fluorescent tubes of a ballast load, so, as long as there is a fluorescent tube to break down, electric ballast is protected immediately, and the fluorescent tube of institute's load extinguishes immediately, the user is used cause bad influence.
Summary of the invention
The object of the present invention is to provide a kind of abnormal condition protection device; after fluorescent tube lamp occurs and does not start abnormality; tube circuit cut-offs; fluorescent tube quits work; change behind the intact fluorescent tube again operate as normal immediately, when a ballast used two or two above fluorescent tubes, the A fluorescent tube damaged protection A tube circuit; all the other fluorescent tubes pass through to regulate endure automatically in the rated power scope, thereby guarantee the safe handling of electric ballast and all the other fluorescent tubes.
The objective of the invention is and can realize by following technical measures: the fluorescent lamp abnormal condition protection device by sample circuit, control circuit, circuit is cut-off in fluorescent tube output and holding circuit is formed.When lamp lamp occurs and does not start abnormality, sample circuit makes the control circuit action, the relay adhesive, the normally opened contact tripping disconnects the fluorescent lamp output loop, fluorescent lamp is quit work, meanwhile, because the relay normally open contact closure, holding circuit adds to control circuit with electric ballast input circuit voltage, make relay keep adhesive, continue to disconnect the fluorescent lamp output circuit.When taking out the fluorescent tube that damages; disconnection electric ballast output major loop is connected with control circuit; relay is discharged, change intact fluorescent tube after, fluorescent lamp again can operate as normal; when two of uses or two above fluorescent tubes; relay is owing to two groups of contacts of employing, thereby except that reaching above-mentioned defencive function, another group normally-closed contact of relay cut-offs the adjusting inductance L; make power adjusted, thereby guarantee that remaining fluorescent tube can be operated within the fluorescent tube rated power scope.
The present invention compares with existing technologies, has the following advantages:
1. cut-off circuit owing to adopted the relay normally-closed contact to do fluorescent tube output; just to the tube circuit effect; changing behind the intact fluorescent tube can operate as normal; again Switching Power Supply; avoided turn-offing when abnormality appears in fluorescent tube in the prior art electric ballast power switch transistor; switching circuit is quit work; still make switching circuit be in the state of quitting work even change intact abnormal condition of lamp tube state protection; this moment, fluorescent tube can not be lighted; reclose power supply again after having only power cutoff, electric ballast is the weak point of operate as normal again.
2. when two of electric ballast uses or two above fluorescent tubes, wherein the abnormality phenomenon appears in the A fluorescent tube, turn-off the A tube circuit, the abnormality phenomenon appears in the B fluorescent tube, turn-off the B tube circuit, can not influence the operate as normal of electric ballast, as long as when having avoided prior art to have a tubes abnormality to occur, the electric ballast switching circuit quits work, and all out-of-work defective of all fluorescent tubes.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments:
Fig. 1 is the electrical schematic diagram of electron ballast abnormality state protection device on the market;
Fig. 2 is the electrical schematic diagram of electron ballast abnormality state protection device of the present invention;
Fig. 3 is the electrical schematic diagram of the another kind of connection of holding circuit of the present invention;
Fig. 4 is the electrical schematic diagram of the another kind of scheme of control circuit of the present invention;
Fig. 5 uses the electrical schematic diagram of two or two above fluorescent tubes for ballast of the present invention;
The electrical schematic diagram of Fig. 6 another kind of connection of single tubes abnormal condition protection device for ballast of the present invention uses;
Fig. 7 uses two or two electrical schematic diagrams that above fluorescent tube has automatic adjusting power functions for ballast of the present invention.
Embodiment
As shown in Figure 2, electron ballast abnormality state protection device by sample circuit 1, control circuit 2, circuit is cut-off in fluorescent tube output and holding circuit is formed.One end of control circuit 2 relay J 1 coil is connected by resistance R 3 and electric ballast are anodal, and the other end of relay J 1 coil is connected on the collector electrode of triode V1, and the emitter of triode V1 is connected with the electric ballast negative pole.On the fluorescent tube Rf1 of electric ballast output circuit, be connected to the normally-closed contact J1-B of relay J 1, constitute fluorescent tube output and cut-off circuit.The input circuit of fluorescent tube is connected on the output circuit of fluorescent tube by resistance R 1, and is connected on the base stage of control circuit 2 triode V1 by the normally opened contact J1-K of relay J 1, constitutes holding circuit.The sampling current potential is to take out at the tie point P of electric ballast outputting inductance L1 and fluorescent tube input circuit, receive on the base stage of triode V1 by resistance R 2, diode D1, voltage-stabiliser tube D2, electrochemical capacitor C3 in parallel between triode V1 base stage and the electric ballast negative pole, constitute sample circuit 1, sample circuit can also adopt embodied in other.When electric ballast normally used, M point current potential deficiency was so that voltage-stabiliser tube D2 punctures conducting, and control circuit 2 triode V1 end because of the base stage no-voltage, relay J 1 not adhesive.In case abnormality occurs, the P point certainly leads to a very high electromotive force, as long as M point current potential reaches trigger voltage, voltage-stabiliser tube D2 is with regard to conducting, and sampling voltage makes its conducting by the base stage that voltage-stabiliser tube D2 is added to control circuit 2 triode V1, relay J 1 adhesive, the fluorescent tube output circuit is cut-off in the rapid tripping of normally-closed contact J1-B of relay J 1, and fluorescent tube is quit work.Meanwhile, the normally opened contact J1-K closure of relay J 1, electric ballast P point current potential is added on the base stage of control circuit 2 triode V1 by the normally opened contact J1-K of fluorescent tube Rf1 input circuit, resistance R 1, output circuit relay J 1, make triode V1 continue to keep conducting state, relay J 1 keeps adhesive, and fluorescent tube Rf1 continues to quit work.When pulling down the damage fluorescent tube, promptly disconnect electric ballast P point current potential and be connected by the base stage of holding circuit with control circuit 2 triodes (V1), triode V1 is ended, relay J 1 discharges, its normally-closed contact J1-B closure, as change intact fluorescent tube, again can operate as normal.
Fig. 3 is the another kind of connection of the resistance R 1 of electron ballast abnormality state protection device holding circuit of the present invention, and resistance R 1 is connected in the fluorescent tube resonant tank after being connected in parallel with resonant capacitance Cx, and its effect is the same with being attempted by the fluorescent tube input with output.
Fig. 4 is the another kind of scheme of control circuit 2 of the present invention.One of resistance R 5, R6 terminates on the positive pole of electric ballast, the other end of resistance R 5 is connected with the collector electrode of triode V2, its node is connected to the base stage of triode V3, the other end of resistance R 6 is connected with triode V3 collector electrode, the emitter of triode V3 is connected on the negative pole of electric ballast by the coil of relay J 1, and the emitter of triode V2 also is connected on the negative pole of electric ballast.Sample circuit can also adopt the transformer sampling mode to carry out, the elementary of sampling transformer is serially connected on the electric ballast major loop, the secondary end of sampling transformer is connected with the electric ballast negative pole, the other end is received on the base stage of triode V2 by diode D1, resistance R 2, voltage-stabiliser tube D2, electrochemical capacitor C3 is connected in parallel between triode V2 base stage and the electric ballast negative pole, and it is the same with holding circuit with Fig. 2 that circuit is cut-off in its fluorescent tube output.During the electric ballast energized, owing to triode V2 base stage does not have voltage to end, the electric ballast positive voltage is added to positive voltage on the base stage of triode V3 by resistance R 5, triode V3 conducting, relay J 1 adhesive, the normally opened contact J1-K of relay J 1 connects the electric ballast operate as normal with electric ballast fluorescent tube major loop.When abnormality occurring, sampling transformer is secondary to certainly lead to a high sampling voltage, sampling voltage is by diode D1, resistance R 2 punctures voltage-stabiliser tube D2 and directly is added on the triode V2 base stage, at this moment, because electrochemical capacitor C3 both end voltage can not be suddenlyd change, thereby play time-lag action, avoid false triggering at ordinary times, treat that the electrochemical capacitor charging finishes, its sampling voltage makes the base potential of triode V3 transfer electronegative potential to and end relay J 1 release for triode V2 provides the base flow conducting, the normally-closed contact J1-B of relay J 1 resets, and disconnects the electric ballast load circuit and quits work.At this moment, P point current potential provides base current to keep conducting for triode V2 by filament 1, resistance R 1, filament 2, relay J 1, the normally-closed contact J1-B of fluorescent tube Rf1, and electric ballast continues to keep this state.When taking off fluorescent tube Rf1, disconnect being connected of P point current potential and triode V2 base stage, change intact fluorescent tube after, electric ballast again can operate as normal.
Fig. 5 is the electrical schematic diagram that electric ballast of the present invention uses two or two above fluorescent tubes.As shown in the figure; it is that cover abnormal condition protection device of the present invention is set in the every tubes circuit of electric ballast; and the principle of every cover abnormal condition protection device described with Fig. 2 be the same; when the abnormality phenomenon appears in the Rf1 fluorescent tube; the abnormal condition protection device effect of Rf1 tube circuit; stop the Rf1 lamp works; when the abnormality phenomenon appears in the Rf2 fluorescent tube; the abnormal condition protection device effect of Rf2 tube circuit; stop the Rf2 lamp works and can not influence the operate as normal of electric ballast; after changing intact fluorescent tube, can work immediately again.
Fig. 6 is the another kind of protected mode that electric ballast of the present invention uses single tubes abnormality.On magnetic ring transformer B, increase winding B-3, the end of its winding B-3 is connected with electrochemical capacitor C negative pole with switching circuit triode T2 base stage, the other end is connected by diode D and electrochemical capacitor C are anodal, its node is connected on the negative pole of electric ballast by the normally opened contact J1-2K of diode D3, two groups of contact relay J 1, when fluorescent tube lamp occurs and does not start abnormality, the high electrical breakdown voltage-stabiliser tube D2 of sample circuit makes triode V2 conducting, relay J 1 adhesive.The normally opened contact J1-2K closure of relay J 1, the switch triode T2 base stage of electric ballast is pressed onto ground by the negative bias of being made up of magnetic ring transformer winding B-3, diode D3, electrochemical capacitor C, has turn-offed the switch vibration of electric ballast, makes it to quit work.The filament 1 of electric ballast P point voltage by fluorescent tube Rf1, the normally opened contact J1-1K that keeps resistance R 1, filament 2, relay J 1 keep base flow to make relay continue adhesive to triode V1 base stage, disconnect being connected of P point and triode V1 base stage when change damaging fluorescent tube, behind the fluorescent tube of changing, electric ballast again can operate as normal.Under the situation for high power load, can avoid adopting big current contact to cut-off the electric ballast major loop, reach with the big function of little control.
Fig. 7 is that two of ballast uses of the present invention or two above fluorescent tubes have the electrical schematic diagram that fluorescent tube is regulated power functions automatically.Because electric ballast is when using two or two above fluorescent tubes, its electric ballast switch controlled circuit parameter determines, reducing when using the fluorescent tube number, and the use power ratio of all the other fluorescent tubes is higher, thereby can shorten fluorescent tube useful life.The relay that the utility model will use in every group of abnormality device changes the relay of two groups of contacts into; as shown in the figure; the normally-closed contact J1-1B of relay J 1 is connected on the output circuit of fluorescent tube Rf1; normally opened contact J1-1K is connected on the holding circuit; and another group normally-closed contact J1-2B and other fluorescent tube Rf2; relay normally-closed contact J2-2B in the device of Rf3; J3-2B is connected in series; being connected in parallel on electric ballast output regulates on the inductance L; when abnormality appears in any tubes; the abnormal condition protection device of this tubes works immediately; after its relay adhesive; when disconnecting this tubes output loop, short circuit is regulated the normally-closed contact tripping at inductance L two ends at electronic ballast output end; reduce power output; can be operated within the specified use power bracket of fluorescent tube so that remain fluorescent tube, thereby guarantee that effectively the residue fluorescent tube is safe in utilization.
Claims (6)
1. electron ballast abnormality state protection device, by sample circuit, control circuit, circuit is cut-off in fluorescent tube output and holding circuit is formed, an end that it is characterized in that relay (J1) coil is connected by resistance (R3) and electric ballast are anodal, the other end of relay (J1) coil is connected on the collector electrode of triode (V1), the emitter of triode (V1) is connected with the electric ballast negative pole, forms control circuit; On the fluorescent tube output circuit of electric ballast, be connected to the normally-closed contact of relay, constitute fluorescent tube output and cut-off circuit; The input circuit of fluorescent tube is connected on the output circuit of fluorescent tube by resistance (R1), and is connected on the base stage of control circuit triode (V1) by the normally opened contact of relay, constitutes holding circuit.
2. abnormal condition protection device according to claim 1 is characterized in that the resistance (R1) in the holding circuit, can also be serially connected in the fluorescent tube loop after resonant capacitance (Cx) is in parallel.
3. according to claim 1,2 described abnormal condition protection devices; it is characterized in that control circuit can also adopt two triodes (V2), (V3) to form; wherein one of resistance (R5), (R6) terminate on the positive pole of electric ballast; one end of resistance (R5) is connected with the collector electrode of triode (V2); the base stage that connects triode (V3) on its node, the emitter of triode (V2) directly is connected with the negative pole of electric ballast.Resistance (R6) is connected with the collector electrode of triode (V3), and the emitter of triode (V3) is connected on the negative pole of electric ballast by relay (J1).
4. according to claim 1,2,3 described abnormal condition protection devices; when it is characterized in that adopting electric ballast to use the above fluorescent tube of two or two, the circuit of forming every tubes all can independently be provided with the above-mentioned abnormal condition protection device of a cover.
5. according to claim 1,2 described abnormal condition protection devices; it is characterized in that in the protection of single electric ballast; can also on magnetic ring transformer, increase winding (B-3); one end of its winding (B-3) is connected with electrochemical capacitor (C8) negative pole with switching circuit triode (T2) base stage; the other end is connected by diode (D) and electrochemical capacitor (C8) are anodal, and its node is connected on the negative pole of electric ballast by the normally opened contact (J1-2K) of relay (J1).
6. according to claim 1,2,3 described abnormal condition protection devices; when it is characterized in that ballast uses the above fluorescent tube of two or two; relay in the self-contained unit of every tubes circuit setting can also adopt the relay of two groups contact; one group of normally closed normally opened contact of relay is used for the output of this group fluorescent tube and cut-offs circuit and holding circuit; after another group normally-closed contact of relay in the self-contained unit of another group normally-closed contact and other tube circuit setting is connected in series, is connected in parallel on electric ballast output and regulates on the inductance (L).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410015287 CN1652658A (en) | 2004-02-06 | 2004-02-06 | Abnormal state protector for electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410015287 CN1652658A (en) | 2004-02-06 | 2004-02-06 | Abnormal state protector for electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1652658A true CN1652658A (en) | 2005-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410015287 Pending CN1652658A (en) | 2004-02-06 | 2004-02-06 | Abnormal state protector for electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1652658A (en) |
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2004
- 2004-02-06 CN CN 200410015287 patent/CN1652658A/en active Pending
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Open date: 20050810 |