FR2594270A1 - Protection of series supply circuits for lamps - Google Patents
Protection of series supply circuits for lamps Download PDFInfo
- Publication number
- FR2594270A1 FR2594270A1 FR8601877A FR8601877A FR2594270A1 FR 2594270 A1 FR2594270 A1 FR 2594270A1 FR 8601877 A FR8601877 A FR 8601877A FR 8601877 A FR8601877 A FR 8601877A FR 2594270 A1 FR2594270 A1 FR 2594270A1
- Authority
- FR
- France
- Prior art keywords
- varistor
- protection
- lamps
- series
- terminals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/10—Circuits providing for substitution of the light source in case of its failure
- H05B39/105—Circuits providing for substitution of the light source in case of its failure with a spare lamp in the circuit, and a possibility of shunting a failed lamp
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/043—Protection of over-voltage protection device by short-circuiting
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
La présente invention à pour objet le perfectionnement des systèmes d'éclairage utilisant des circuits de lampes alimentées en série l'invention s'applique en particulier au système décrit dans le Brevet nO 8204959 où l'intensité du circuit est réglée pàr l'intermédiaire d'un condensateur. The subject of the present invention is the improvement of lighting systems using circuits of lamps supplied in series. The invention applies in particular to the system described in Patent No. 8204959 where the intensity of the circuit is adjusted by means of 'a capacitor.
Dans un tel montage, il est nécessaire de prévoir un dispositif de protection du circuit contre les effets néfastes que peuvent causer les impulsions transitoires non controlées. Ces impulsions d'origines très diverses sont souvent présentes de manière aléatoire ou répétitive dans les réseaux d'alimentations à tension alternative et peuvent entrainer la destruction de la série de lampes. I1 est donc important de les neutraliser d'une manière efficace pour assurer la sécurité de fonctionnement indispensable à toute installation d'éclairage. In such an arrangement, it is necessary to provide a device for protecting the circuit against the harmful effects which uncontrolled transient pulses can cause. These pulses of very diverse origins are often present randomly or repetitively in AC power supply networks and can lead to the destruction of the series of lamps. It is therefore important to neutralize them effectively to ensure the operational safety essential to any lighting installation.
C'est ce que propose la présente invention qui prévoit l'utilisation conjuguée de composants du type écréteurs de tension par résistances variables ou varistances couplées avec un interrupteur et un coupe circuit automatique du qenre relais, qui entre en action lorsque le circuit devient anormal. This is what the present invention provides, which provides for the combined use of components of the voltage clipping type by variable resistors or varistors coupled with a switch and an automatic circuit breaker of the qenre relay, which comes into action when the circuit becomes abnormal.
Le courant dérivé par le semi-conducteur qui est une résistance non linéaire ou varistance, augmente très fortement avec la tension appliquée et actionne le contact du relais qui assure la fermeture du circuit et le shuntage de la varistance. The current derived by the semiconductor which is a nonlinear resistor or varistor, increases very strongly with the applied voltage and activates the contact of the relay which ensures the closing of the circuit and the shunting of the varistor.
Selon une première forme d'application de l'invention, un seul dispositif peut être branché en parallèle sur le circuit des lampes, mais ne prévoit pas la continuité de fonctionnement en cas de rupture d'un filament (défectuosité d'une lampe de la série). According to a first form of application of the invention, a single device can be connected in parallel to the lamp circuit, but does not provide for continuity of operation in the event of a filament breakage (failure of a lamp in the series).
Selon une seconde forme d'application plus évoluée, un dispositif relais et varistance est branché aux bornes de chaque lampe, et assure une protection simultanée du circuit contre les surtensions et la coupure éventuelle du circuit (lorsque la lampe s'arrête de fonctionner par défaillance). According to a second, more advanced form of application, a relay and varistor device is connected to the terminals of each lamp, and ensures simultaneous protection of the circuit against overvoltage and possible interruption of the circuit (when the lamp stops operating by failure ).
Une forme d'éxécution de l'invention est décrite ci-aprés, à titre indicatif en se référant aux dessins annexés
La Figure 1 représente le schéma du circuit d'alimentation.An embodiment of the invention is described below, by way of indication with reference to the accompanying drawings.
Figure 1 shows the diagram of the supply circuit.
La Figure 2 le même schéma avec le dispositif de protection général du circuit. Figure 2 the same diagram with the general protection device of the circuit.
La Figure 3 représente une variante de cette protection. Figure 3 shows a variant of this protection.
La Figure 4 représente le schéma du dispositif de protection au niveau de chaque lampe. Figure 4 shows the diagram of the protection device at each lamp.
Le circuit comporte l'alimentation du condensateur C commandé par l'interrupteur I, les lampes L étant reliées en série à la sortie du condensateur par le conducteur P qui rejoint le neutre N. The circuit includes the supply of the capacitor C controlled by the switch I, the lamps L being connected in series to the output of the capacitor by the conductor P which joins the neutral N.
La première protection consiste à insérer un écréteur haute-tension e du type parafoudre qui sera disposé en parallèle sur la ligne en amont du condensateur. Bien que non négligeable, cette protection est insuffisante au niveau des lampes. The first protection consists in inserting a high voltage th surge arrester of the arrester type which will be placed in parallel on the line upstream of the capacitor. Although not negligible, this protection is insufficient in terms of lamps.
Ainsi une meilleure protection du circuit lampes doit être opérée ; entre phase et neutre à la sortie du condensateur. Pour cela on place la varistance V dont la tension efficace de service est légèrement supérieure à la tension du circuit -(somme des tensions élémentaires des lampes). Afin que cette varistance ne soit détérioréepar le courant dérivé consécutif à-la défectuosité d'une lampe, il est nécessaire de la shunter. Pour cela, on utilise un bilame thermique constitué par un starter à lueur S, semblable à ceux utilisés pour l'amorçage des lampes fluorescentes (Fig. 2), une autre solution consiste à utiliser un relai Ampèremétrique R, dont la bobine b est en série avec le contact, lequel ferme le circuit en shuntant la varistance V, branchée aux bornes 1 et 2 dudit contact (Fig. 3). Thus a better protection of the lamp circuit must be operated; between phase and neutral at the output of the capacitor. For this we place the varistor V whose effective operating voltage is slightly higher than the circuit voltage - (sum of the elementary voltages of the lamps). In order that this varistor is not deteriorated by the derivative current consecutive to the defectiveness of a lamp, it is necessary to shunt it. For this, we use a thermal bimetal consisting of a glow starter S, similar to those used for lighting fluorescent lamps (Fig. 2), another solution consists in using an ammeter relay R, whose coil b is in series with the contact, which closes the circuit by shunting the varistor V, connected to terminals 1 and 2 of said contact (Fig. 3).
Une autre forme de protection trés efficace consiste à placer un relais ampèremétrique aux bornes de chaque lampe du circuit (Fig. 4); la bobine du relais R étant en série avec le contact C lorsque le courant dérivé par la varistance V,- branchée aux bornes des dits contacts excite la bobine, le circuit est fermé et la varistance est shuntée.Another very effective form of protection consists in placing an ammeter relay at the terminals of each lamp in the circuit (Fig. 4); the coil of relay R being in series with contact C when the current derived by the varistor V, - connected to the terminals of said contacts excites the coil, the circuit is closed and the varistor is shunted.
Ce dispositif offre l'avantage d'une double protection du circuit, car il peut également se substituer à la lampe défectueuse pour assurer la continuité de fonctionnement des autres lampes du circuit. This device offers the advantage of a double protection of the circuit, because it can also replace the defective lamp to ensure the continuity of operation of the other lamps of the circuit.
Bien entendu, dans un tel montage, on devra s'arranger pour que la tension efficace de la varistance soit légèrement supérieure à la tension d'utilisation de la lampe, et que le relais ampèremétrique soit capable de supporter l'intensité du courant traversant le circuit.Of course, in such an arrangement, it will have to be arranged so that the effective voltage of the varistor is slightly greater than the voltage of use of the lamp, and that the ammeter relay is able to withstand the intensity of the current passing through the circuit.
L'invention s'applique à tout système d'éclairage utilisant des circuits de lampes alimentées en série. The invention applies to any lighting system using circuits of lamps supplied in series.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8601877A FR2594270A1 (en) | 1986-02-10 | 1986-02-10 | Protection of series supply circuits for lamps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8601877A FR2594270A1 (en) | 1986-02-10 | 1986-02-10 | Protection of series supply circuits for lamps |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2594270A1 true FR2594270A1 (en) | 1987-08-14 |
Family
ID=9332040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8601877A Withdrawn FR2594270A1 (en) | 1986-02-10 | 1986-02-10 | Protection of series supply circuits for lamps |
Country Status (1)
Country | Link |
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FR (1) | FR2594270A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1759023A (en) * | 1927-08-16 | 1930-05-20 | American Telephone & Telegraph | Electrical protective device |
GB1073068A (en) * | 1965-06-16 | 1967-06-21 | British Lighting Ind Ltd | Series operation of electric lamps |
GB1095673A (en) * | 1964-07-03 | 1967-12-20 | Danfoss As | A circuit arrangement for indicating component failure in a series-connected chain ofresistive components, each producing a perceptible output during use |
US3912966A (en) * | 1973-04-30 | 1975-10-14 | Gen Electric | Incandescent lamp series string having protection against voltage surges |
FR2523798A1 (en) * | 1982-03-22 | 1983-09-23 | Pierre Jean | LV lamp from mains using capacitive current limiting - uses series connected capacitor to limit lamp current when connected to AC mains supply |
DE3318588A1 (en) * | 1983-05-21 | 1984-11-22 | Brown, Boveri & Cie Ag, 6800 Mannheim | VARISTOR LOCKING ELEMENT |
-
1986
- 1986-02-10 FR FR8601877A patent/FR2594270A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1759023A (en) * | 1927-08-16 | 1930-05-20 | American Telephone & Telegraph | Electrical protective device |
GB1095673A (en) * | 1964-07-03 | 1967-12-20 | Danfoss As | A circuit arrangement for indicating component failure in a series-connected chain ofresistive components, each producing a perceptible output during use |
GB1073068A (en) * | 1965-06-16 | 1967-06-21 | British Lighting Ind Ltd | Series operation of electric lamps |
US3912966A (en) * | 1973-04-30 | 1975-10-14 | Gen Electric | Incandescent lamp series string having protection against voltage surges |
FR2523798A1 (en) * | 1982-03-22 | 1983-09-23 | Pierre Jean | LV lamp from mains using capacitive current limiting - uses series connected capacitor to limit lamp current when connected to AC mains supply |
DE3318588A1 (en) * | 1983-05-21 | 1984-11-22 | Brown, Boveri & Cie Ag, 6800 Mannheim | VARISTOR LOCKING ELEMENT |
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ST | Notification of lapse |