CN101060737A - A circuit of displaying the functional status of detecting lamp and ballast - Google Patents
A circuit of displaying the functional status of detecting lamp and ballast Download PDFInfo
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- CN101060737A CN101060737A CNA200610073794XA CN200610073794A CN101060737A CN 101060737 A CN101060737 A CN 101060737A CN A200610073794X A CNA200610073794X A CN A200610073794XA CN 200610073794 A CN200610073794 A CN 200610073794A CN 101060737 A CN101060737 A CN 101060737A
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- lamp
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- functional status
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
- H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
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- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The disclosed circuit for detecting lamp with at least one electrode comprises: a voltage-dividing device with an intermediate point for outputting voltage signal reflected lamp state, a one-way conductive unit connected with both the electrode and intermediate point to block the positive or negative component from lamp to the voltage-dividing device. This invention improves detecting accuracy on lamp state.
Description
Technical field
The present invention relates to a kind of detection circuit of lamp, and the ballast that uses this detection circuit.
Technical background
Detection circuit is widely used in the control device of lamp.For example, a kind of detection circuit that is used for fluorescent lamp ballast is used for surveying the safety problem that fluorescent lamp may occur in working.When safety problem takes place, for example start mistake, fluorescent tube does not exist, and starting resistor deficiencies etc. will be detected circuit to detect, thereby trigger the safety protecting mechanism of lamp.Usually, the functional status of lamp is the important indicator of safety problem.The functional status of lamp comprises: lamp exists and is working properly; Lamp does not exist; Lamp exists, but because damage can't operate as normal.
But, find that in practice known detection circuit is too responsive sometimes in actual moving process.In other words, even the functional status of lamp is normal fully, the functional status that known detection circuit also may indicator light is undesired, thereby triggers safety protecting mechanism.
Summary of the invention
The present invention attempts to propose a kind of new detection circuit to avoid can not accurately surveying under some situation the problem of the functional status of lamp.
Based on this purpose, the present invention proposes a kind of circuit that is used to survey the functional status of lamp, and this light fixture has at least one electrode, and this circuit comprises: a bleeder mechanism, have an intermediate point, and be used to export the voltage signal of the functional status of a reflection lamp; A unilateal conduction unit is connected with described at least one electrode, and is connected with described intermediate point, is used to stop along a current signal from described lamp to described bleeder mechanism direction one section on the occasion of composition or one section negative value composition.
Preferably, described unilateal conduction unit is a diode.
Preferably, described circuit further comprises: a conductive unit is communicated with a reference voltage and described at least one electrode.
Preferably, described circuit further comprises: a comparing unit is used for voltage signal and a contrast signal of the output of described bleeder mechanism are compared, thereby produces a value that is used to illustrate the functional status of lamp.
The present invention proposes a kind of ballast that is used to drive a lamp simultaneously, and described ballast comprises the circuit that the present invention proposes.
With reference to the description of following examples, these and other aspects of the present invention will further be set forth and be further obvious.
Description of drawings
Now, only as an example, explain the present invention with reference to the accompanying drawings, wherein
Fig. 1 schematically shows the embodiment according to a detection circuit of the present invention.
Fig. 2 schematically show detection circuit according to another preferred embodiment.
In above-mentioned accompanying drawing, identical reference symbol is represented identical, similar or function corresponding feature.
Embodiment
Fig. 1 is the circuit diagram of the detection circuit according to the present invention.As shown in the figure, lamp L has two electrode E1, E2, and these two electrodes are connected with the end of a conductive unit CU.The other end of this conductive unit CU is connected to a reference voltage Vr at the P1 point, in this figure for being connected to no-voltage, Vr=0, i.e. ground connection.Simultaneously, described two electrode E1, the electric current outflow end of an E2 and a unilateal conduction cells D, for example the negative electrode of a diode is connected; The electric current of this unilateal conduction cells D flows into end, and for example the anode of a diode is connected with the intermediate point P2 of a bleeder mechanism VT by a resistance R 1.The resistance on bleeder mechanism VT intermediate point P2 both sides is respectively R2 and R3, is connected to a direct voltage source Vs P3 point ground connection with at the P4 point respectively.The magnitude of voltage that P2 is ordered can be output to a comparing unit CM, and magnitude of voltage and a contrast signal that this comparing unit CM is used for P2 is ordered compare, to obtain a value that the functional status of lamp is described.Wherein, we to set electric current be the reference direction of electric current from the direction that lamp L flow to bleeder mechanism VT.Above-mentioned unilateal conduction unit will only allow the electric current direction opposite along reference side, and promptly the electric current of negative value flows, and the current signal of forward part will be prevented from.
When lamp L functional status just often, form closed circuit between P1 point and the P2 point.Because P1 and 2 equal ground connection of P3, current potential is zero, and electric current will be from the P2 of high potential on the one hand along R1, D, and E2, E1, CU, the P1 direction flows, and on the other hand along R2, the P3 direction flows.At this moment, resistance R 1 is born the dividing potential drop effect jointly with R2.The resistance of R1 after in parallel with R2 represents with R1//R2, and then the P2 magnitude of voltage of ordering should be
V
p2-1＝(R1//R2)/(R3+R1//R2)*Vs
When lamp L is in improper functional status, promptly L does not exist, and perhaps L is impaired, and for example electrode E1 or E2 damage, and then formation is opened a way between P1 and the P2 point.The magnitude of voltage that this moment, P2 was ordered is exactly the partial pressure value of calculating according to resistance R 2 and resistance R 3, promptly
V
p2-2＝R2/(R2+R3)*Vs
Obviously, V
P2-1＜V
P2-2, in other words, lamp is in magnitude of voltage that normal function state P2 of following time orders, and should to be in improper functional status less than lamp be the magnitude of voltage that lamp does not exist or P2 when having damaged is ordered.
Based on above-mentioned principle, the magnitude of voltage that P2 can be ordered is input to a comparing unit CM.The magnitude of voltage that this comparison means can be ordered P2 is compared with a default contrast signal.This contrast signal can be according to the input voltage Vs of bleeder mechanism VT, R1, and R2, the resistance value of R3 preestablishes.For example, this contrast signal can be the reference voltage value of a 0.6V; The voltage V of ordering as P2
P2During＜0.6V, think that then lamp is in normal functional status; Work as V
P2During＞0.6V, think that then lamp is in the abnormal function state, thereby start safety protecting mechanism.
Above-mentioned analysis is not particularly related to the effect of asymmetrical circuit element D.In fact, this asymmetrical circuit element plays important effect in detection circuit of the present invention.
There is this situation in the practice: when lamp is in normal functional status, in foregoing circuit, may have forward current signal from lamp L to bleeder mechanism VT direction.There is resistance in the existence of forward current in the side circuit in addition, will cause there is boosting in the voltage that P2 is ordered.Simultaneously, will there be hypotensive effect in negative current to the voltage that P2 is ordered.General industry all is symmetrical with the waveform of alternating current, and the forward composition is suitable with the negative sense composition, thereby can't influence the voltage that P2 is ordered.But in some cases, current waveform and asymmetric may occur, in other words, forward composition and negative sense composition are unsuitable in the electric current, show as the characteristic of forward dc or negative sense direct current on the whole.(being referred to as " asymmetrical current ").In addition, common direct current also belongs to asymmetrical current on above-mentioned meaning.
The reason that asymmetrical current produces may be many aspects.For example, in the start-up course of fluorescent lamp, an electrode that lamp might occur has been in emission state, and the another one electrode does not reach emission state because temperature is too low, thereby may cause producing asymmetry by the electric current of electrode.This situation may be since useful life of fluorescent tube near finishing, perhaps fluorescent tube since repeatedly fast startup do not pass through suitable warm-up time, perhaps because the quality of different electrodes is consistent inadequately, or the like.Often just there is the very short time in this situation in the process that fluorescent tube starts, fluorescent tube still can operate as normal, but as mentioned above, may cause the mistake of security mechanism to start fully, influences the normal use of lamp.
Other situation also may be: the disturbance current that produces in circuit because other interference sources produce, the influence of other power supplys or other parts of circuit etc.
In circuit shown in Figure 1, when the forward composition in the electric current is less than the negative sense composition, when promptly having the negative sense asymmetrical current, electric current will show as the characteristic of negative current on the whole, thereby the voltage that causes P2 to be ordered descends.The decline of P2 point voltage can't trigger any security mechanism, to the function realization did not influence of detection circuit of the present invention.On the contrary, when the forward composition in the electric current during more than the negative sense composition, when promptly having the forward asymmetrical current, electric current will show as the characteristic of forward current on the whole, thereby the voltage that causes P2 to be ordered rises.The magnitude of voltage of ordering as P2 is output to comparison means CM, and when surpassing default reference voltage value, the functional status of lamp will be thought unusually, thereby trigger safety protecting mechanism.Like this, because the interference of forward asymmetrical current may cause the false judgment of detection circuit to the functional status of lamp.
In fact, the forward current of this reference direction realizes not being necessary to the function of above-mentioned detection circuit; As long as the functional status of lamp just often can be realized electric current and flow from P2 to the P1 direction, promptly allow electric current to flow along the negative sense of reference direction, just can guarantee that R1 realizes above-mentioned common dividing potential drop effect, thereby guarantee the detecting function of circuit.Therefore, as shown in Figure 1, the present invention promptly between the tie point electrode E2 of the intermediate point P2 of bleeder mechanism VT and lamp L, is provided with an asymmetrical circuit element D, for example a diode between lamp L and bleeder mechanism VT.The end that this asymmetrical circuit element D electric current flows into, the anode of a diode for example, with bleeder mechanism VT in other words the direction of P2 is connected, be connected with P2 for passing through resistance R 1 shown in the figure; The end that this individual event conducting element D electric current flows out, the negative electrode of a diode for example, with the direction of lamp, the E2 direction connects in other words.By the existence of this asymmetrical circuit element, both guaranteed that electric current can flow along the negative sense of reference current direction, thus the operate as normal of detection circuit; Limited the forward flow of electric current again, thereby reduced or got rid of along the interference of the forward asymmetrical current of reference direction to result of detection along the reference current direction.
Fig.2 is the circuit diagram of the another one embodiment of the detection circuit that proposes of the present invention.In this figure, each electric component and connected mode thereof and Fig. 1 are basic identical, difference is following two aspects: first, in circuit shown in Figure 2, the reference voltage Vr=Vs that the conducting element CU that links to each other with lamp L is connected to, in other words, be same voltage source with the external direct voltage source Vs that is connected bleeder mechanism VT; The second, what present embodiment inserted is an asymmetrical circuit element just opposite with embodiment conducting direction shown in Figure 1, for example a diode.
When lamp L functional status just often, form closed circuit between P1 point and the P2 point.R1, R3 are relations in parallel, bear the dividing potential drop effect jointly.The resistance of R1 after in parallel with R3 represents with R1//R3, and then the P2 magnitude of voltage of ordering should be
V
p2-1＝R2/(R2+R1//R3)*Vs
When lamp L is in improper functional status, promptly L does not exist, and perhaps L is impaired, and for example electrode E1 or E2 damage, and formation is opened a way between P1 and the P2 point.The magnitude of voltage that this moment, P2 was ordered is exactly the partial pressure value of calculating according to resistance R 2 and resistance R 3, promptly
V
p2-2＝R2/(R2+R3)*Vs
Obviously, V
P2-1＞V
P2-2, in other words, lamp is in magnitude of voltage that normal function state P2 of following time orders and should be higher than lamp to be in improper functional status be the magnitude of voltage that lamp does not exist or the P2 when having damaged is ordered.
Based on above-mentioned principle, the magnitude of voltage that P2 can be ordered is input to a comparing unit CM.The magnitude of voltage that this comparison means can be ordered P2 is compared with a default contrast signal.This contrast signal can be according to the input voltage Vs of bleeder mechanism VT, R1, and R2, the resistance value of R3 preestablishes.For example, this contrast signal can be the reference voltage value of a 0.6V; The voltage V of ordering as P2
P2During＞0.6V, think that then lamp is in normal functional status; Work as V
P2During＜0.6V, think that then lamp is in the abnormal function state, thereby start safety protecting mechanism.
Opposite with embodiment shown in Figure 1, in the present embodiment, as long as the functional status of lamp just often can be realized electric current and flow from P1 to the P2 direction, promptly allow the forward flow of electric current along reference direction, just can guarantee that R1 realizes above-mentioned common dividing potential drop effect, thereby the detecting function that guarantees circuit is realized.Is not necessary along the negative current of reference direction to the realization of detection circuit function of the present invention; Moreover, the voltage that the asymmetric electric current of negative sense also may cause P2 to order descends, and the magnitude of voltage that causes P2 to be ordered is lower than the reference voltage value, thereby is in abnormality by system's erroneous judgement for lamp, triggers safety protecting mechanism, influences the normal use of lamp.Therefore, present embodiment promptly between the tie point electrode E2 of the intermediate point P2 of bleeder mechanism VT and lamp L, is provided with an asymmetrical circuit element D, for example a diode between lamp L and bleeder mechanism VT.The end that this individual event conducting element D electric current flows into, the anode of a diode for example, with the direction of lamp, the E2 direction connects in other words; The end that this asymmetrical circuit element D electric current flows out, the negative electrode of a diode for example, with bleeder mechanism VT in other words the direction of P2 is connected, be connected with P2 for passing through resistance R 1 shown in the figure.By the existence of this asymmetrical circuit element, both guaranteed that electric current can be along the forward flow of reference current direction, thus the operate as normal of detection circuit; Limited electric current again and flowed, thereby reduced or got rid of along the interference of the negative sense asymmetrical current of reference direction to result of detection along the negative sense of reference current direction.
More than among two embodiment the external reference voltage Vr of conductive unit CU be respectively ground connection, Vr=0, and the external voltage common, Vr=Vs with bleeder mechanism VT.Sense of current difference when the difference of external reference voltage can cause lamp to be in the normal function state, thus the closure of the asymmetrical circuit element D that the present invention inserts influenced.Those of ordinary skill in the art should be clear, and the external reference voltage Vr of conductive unit CU also may be other values except that ground connection or bleeder mechanism VT external voltage Vs; The closure of unilateal conduction cells D may be influenced thus, corresponding adjustment can be made as required.
In the schematic diagram of above two embodiment, show a capacitor C, an end connects the intermediate point P2 of bleeder mechanism VT, an end ground connection.The effect of this capacitor C is to postpone the speed that P2 point voltage value changes, and can alleviate the susceptibility of detection circuit reflection, can be used with other elements of detection circuit of the present invention.Obviously, for the purpose of the present invention, this electric capacity is optionally, and inessential.
More than resistance R 1 among two embodiment can be resistance independently, also can be the in esse resistance value of each element in the circuit.Simultaneously, the realization of this resistance R 1 is not necessary for realization of the present invention, in above embodiment, describe this resistance and just consider the electricresistance effect that exists in the side circuit, and the convenience of narrating relevant voltage or current relationship.
Although sets forth in detail and described the present invention in accompanying drawing and aforesaid description should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The invention is not restricted to disclosed execution mode.
Those those skilled in the art can be by research accompanying drawing, disclosed content and appending claims, and understanding and enforcement are to other changes of disclosed execution mode.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.A plurality of the function that a single processor or other unit are quoted in can enforcement of rights requiring.Any reference marker in the claim should not be construed as the restriction to scope.
Claims (5)
1. circuit that is used to survey the functional status of lamp (L), this lamp (L) have at least one electrode (E1, E2), this circuit comprises:
A bleeder mechanism (VT) has an intermediate point (P2), is used to export a voltage signal that reflects the functional status of lamp;
A unilateal conduction unit (D), with described at least one electrode (E1, E2) be connected, and be connected with described intermediate point (P2), one section that is used for the current signal of prevention edge from described lamp (L) to described bleeder mechanism (VT) direction on the occasion of composition or one section negative value composition.
2. circuit as claimed in claim 1, wherein said unilateal conduction unit (D) are diodes.
3. circuit as claimed in claim 1, wherein said circuit further comprises:
A conductive unit (CU), be communicated with a reference voltage (Vr) and described at least one electrode (E1, E2).
4. as claim 1,2, or 3 described circuit, further comprise:
A comparing unit (CM) is used for voltage signal and a contrast signal of described bleeder mechanism (VT) output are compared, thereby produces a value that is used to illustrate the functional status of lamp.
5. ballast that is used to drive a lamp (L), described ballast comprises claim 1, one of 2,3 or 4 circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610073794XA CN101060737A (en) | 2006-04-19 | 2006-04-19 | A circuit of displaying the functional status of detecting lamp and ballast |
| PCT/IB2007/051194 WO2007119189A1 (en) | 2006-04-19 | 2007-04-04 | A circuit for detecting function status of a lamp and a ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610073794XA CN101060737A (en) | 2006-04-19 | 2006-04-19 | A circuit of displaying the functional status of detecting lamp and ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101060737A true CN101060737A (en) | 2007-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610073794XA Pending CN101060737A (en) | 2006-04-19 | 2006-04-19 | A circuit of displaying the functional status of detecting lamp and ballast |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101060737A (en) |
| WO (1) | WO2007119189A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008012452A1 (en) * | 2008-03-04 | 2009-09-10 | Tridonicatco Gmbh & Co. Kg | Circuit for heating and monitoring the heating coils of at least one operated with an electronic ballast gas discharge lamp on spiral breakage |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3247863A1 (en) * | 1982-12-23 | 1984-06-28 | Siemens AG, 1000 Berlin und 8000 München | ARRANGEMENT FOR SWITCHING OFF A INVERTER |
| DE19619580A1 (en) * | 1996-05-15 | 1997-11-20 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Safety shutdown with asymmetrical lamp power |
| US5770925A (en) * | 1997-05-30 | 1998-06-23 | Motorola Inc. | Electronic ballast with inverter protection and relamping circuits |
| DE19819027A1 (en) * | 1998-04-29 | 1999-11-04 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating at least one discharge lamp |
| US7176636B2 (en) * | 2001-11-23 | 2007-02-13 | Koninklijke Philips Electronics N.V. | Circuit arrangement for operating a lamp |
| DE10209619A1 (en) * | 2002-03-05 | 2003-09-25 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Operating circuit for discharge lamp with EOL early detection |
-
2006
- 2006-04-19 CN CNA200610073794XA patent/CN101060737A/en active Pending
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2007
- 2007-04-04 WO PCT/IB2007/051194 patent/WO2007119189A1/en active Application Filing
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| WO2007119189A1 (en) | 2007-10-25 |
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