FI107578B - Procedure and ignition circuit for ignition and extinguishing of high pressure lamp - Google Patents

Description

107578

Method and Ignition Circuit for Switching On and Off High Pressure Lamp.

The invention relates to a method for igniting and extinguishing a high-pressure lamp by an ignition circuit comprising: and 10 - an intelligent control device for controlling the switch open and closed, whereby the switch closing control generates ignition voltage pulses in the secondary winding when the capacitor charge is allowed to oscillate in the oscillation circuit formed by the capacitor and the primary winding.

The invention also relates to an ignition circuit for carrying out the method.

High-pressure lamps, such as high-pressure sodium and metal halide lamps, must be lit with voltage pulses substantially higher than the mains voltage, typically within the voltage range of 1.0 kV to 5 kV. High pressure lamps are mainly used in 20 street lighting and indoors in industrial halls.

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Some high-pressure lamps have a problem that the hot off • · ·. ···. the lamp does not light up fast enough, but remains in an abnormal gas discharge state, • ·. ···. where the lamp cannot be ignited by normal ignition pulses, if not. ···. Let cool occasionally. This situation is common, for example, when the lamp is still »» · hot, it is started again with normal ignition pulses. The problem can be avoided by making ignition attempts infrequently, thus reducing the amount of heat generated by the ignition attempts. For example, ···: · * can be used. a timer that controls the ignition attempts so that they only repeat for, eg, 5 seconds. •. ···. 30 minutes, followed by a pause of eg 1 minute to allow the lamp to cool down. Such timer-controlled ignition is described, for example, in WO 97/08920 and WO 97/08921. These known ignition circuits do not act as an active extinguisher for the lamp or its gas discharge space.

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It is an object of the invention to provide an improved ignition circuit which, in addition to efficient and rapid ignition, can also turn off the lamp or its gas discharge space.

This object of the invention is achieved by the method of claim 1 and the ignition circuit of claim 7. Preferred embodiments of the invention are disclosed in the dependent method claims.

The invention will now be illustrated by reference to the accompanying drawing, which shows an ignition lamp ignition circuit according to one embodiment of the invention.

The power supply 8 is a mains-frequency alternating current, which is connected to the lamp L by the load circuit conductors 15, 11.12. The lamp current is limited by the inductor Lk. The inductive load of the inductor Lk is compensated by the capacitor Ck.

The ignition circuit 10 includes a pulse transformer through which secondary current 2 passes the lamp current. The secondary winding 2 is thus connected in series with the inductor Lk. The switch 3 is connected in series with the primary winding 1 of the pulse transformer and the pulse capacitor '4 is connected in parallel with the serial connection of the switch 3 and the primary winding 1. Ic. The switch 3 is opened and closed by means of a control device 5 which is, for example, a micro «· · • I» · · · ·. processor.

• * ·· «• · · • • • • • · · · ·; 25 Closing control of switch 3 generates ignition voltage pulses in secondary winding 2 when the charge of capacitor 4 oscillates in the form of capacitor 4 and primary winding 1. short. One ignition • · ·: *. ·. pulse duration can be, for example, two microseconds and several ignition pulses can be obtained during one semicircle. 4 · • *. · ·. 30 The rotation ratio of the pulse converter 1, .2 can be «o · * e.g., 5/80.

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The connecting ends of the secondary winding 2 and the primary winding 1 of the pulse transformer associated with the load current line 11 are connected via capacitor 4 to the second load current line 12. The free end of the primary winding 1 is also connected to the second The measuring points 6 and 7 shown are only examples and their location may vary with respect to lamp L and pulse transformer 2. The current measuring element 6 may be, for example, a shunt resistor (a piece of foil), a current transformer or a Hall element.

With this switching arrangement, when the switch 3 is controlled for a longer time (e.g., 1-2 seconds), a short circuit current of the load circuit is passed through the choke Lk, whereby the lamp voltage is reduced so that the lamp L goes out. This extinguishing function can occur for both a normally lit lamp and a lamp left in abnormal gas discharge periods in the event of a misfire, whereby the lamp does not remain in the gas discharge but goes out and attempts to ignite can be repeated more quickly.

As is known, a broken lamp often causes a partial rectification effect. The ignition circuit according to the invention contemplates the DC comm. 20 components with lamp current measuring device 6 and / or lamp voltage measuring 7% »·. The DC component is visible across capacitor 4 when a voltage measurement is performed • in front of coil 2 of the pulse transformer. The level of the DC component can be determined, • · · • »· ·. * ··. by simultaneously sensing 2 currents in the coil. With current measurement I · 4 · · / * ·. Alternatively le 6, the current measurement can also be arranged in connection with the pulse transformer coil • * ·. ***: 25 2. If the DC component of the current becomes too high, the »I · lamp is switched off by short-circuiting the choke Lk with switch 3 and stopping the lamp L: -: *** until circuit 10 is reset (after faulty lamp replacement).

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• · · • · • · · «·. ; · * ·.. When switching off the lamp with current measurement 6 and / or voltage measurement 7 «*. - *. The control element .5 controls the switch 3 to open during the noI current when the load circuit has been short-circuited for 1-2 seconds to turn off the lamp L- * »* /.-. • or to turn off its abnormal gas discharge state to cool the lamp.

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The shutdown situation is terminated by opening the switch during zero current to avoid extra voltage peaks in the circuit.

In addition, the intelligent control device formed by the microprocessor 5 can be utilized in a way that is new in these types of lighters. The intelligent control device 5 can be programmed to collect lamp status information (histories log) in its memory and send its status information to the recipient upon request. The transmission can be via, for example, a pair of wires or an infrared or radio signal.

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Claims (10)

1. A method for switching on and off a high-pressure lamp with an ignition circuit (10) consisting of 5. a pulse transformer through whose secondary winding (2) the lamp current passes and which is connected in series with a current limiting choke (Lk), - a coupling (3 ) in series with the primary winding of the pulse transformer (1), - a pulse capacitor (4) coupled in parallel with the series circuit formed by the coupling (3) and the primary winding (1), and 10. a control device (5) for controlling the coupling (3) to and of, wherein the change in the state of the coupling (3) produces an ignition voltage pulse in the secondary winding (2), since the charge of the capacitor (4) is allowed to oscillate in the swing circuit formed by the capacitor (4) and the primary winding (1), characterized in that the coupling ( 3) if necessary, is regulated for a longer period by conductive say, that the short circuit current of the load circuit passes through the throttle (Lk) and the lamp voltage drops to a small value that the lamp (L) goes out. Method according to claim 1, characterized in that the output of ignition pulses continues for a predetermined time by regulating the coupling; : j 20 (3) with the active control of an intelligent control device (5) alternately switched on and off, that the ignition of the lamp is sensed by the intelligent control device (5) of the coupling (3) • and, after the predetermined time, the abnormal lamp's ignition • · «electric discharge state is terminated with a longer time adjustment of the mentioned connection (3). • · · 25 3. A method according to claim 1 or 2, characterized in that, when the lamp is switched off, the coupling (3) is adjusted at such a phase angle of the lamp current, where the change effect of the peak current caused by the adjustment of the lamp current. is smallest possible. Method according to any one of claims 1-3, characterized in that the cup (3) is opened upon extinguishing the lamp at such a phase angle of the lamp current, where the coupling ( 3) opening causes the smallest possible voltage peak through the secondary transformer (2) of the lamp (L). Method according to any of claims 1-4, characterized in that the coupling (3) is controlled via such a control circuit (5, 6, 7), which identifies the rectifying effect of the discharge lamp (L) by means of the lamp current and / or the lamp voltage. Method according to any one of claims 1-5, characterized in that the discharge lamp (L), which can be switched on and off with the control of the coupling (3), is a multimethod lamp. 7. Ignition circuit for switching on and off a high-pressure lamp, which ignites 15. A pulse transformer through whose secondary winding (2) the lamp current likes and which is connected in series with a current limiting choke (Lk) - a coupling (3) in series with the pulse transformer primary winding (1), - a pulse capacitor (4) connected in parallel with the series circuit formed by the coupling (3) and the primary winding (1), and 20. an intelligent control device (5) for controlling the coupling (3) to and from; - a first and second load circuit line (11,12), between the white lamp (L) can: be switched, the connection of the coupling (3) generating an ignition voltage pulse in the secondary winding (2), as the charge of the capacitor (4) may oscillate in the swing circuit, formed by the capacitor • · · · ... · 25 (4) and the primary winding (1), characterized in that the secondary winding (2) and the primary winding (2) of the pulse transformer (11) connected to the first load current conduit (11) The ends of the winding (1) are coupled via the capacitor (4) to another load current line (12), so that the free end of the primary winding (1) is also connected via said coupling (3) to the other load current The line (12) and that the intelligent control device (5) of the coupling (3) is a: Y: microprocessor, which receives control data from the measuring means (6, 7) for lamp "" in the voltage of the current and / or load circuit and which is programmed to provide the coupling (3) on the base of said control data with an adjustment period long enough to extinguish the lamp. 8. Ignition circuit according to claim 7, characterized in that the switching periods of the coupling (3) for the ignition pulses are shorter than the half-life of the electricity supply and for the lamp period a grid period longer, preferably of the order of 1-2 seconds, and that when the lamp is switched off, (3) the deregulation where the actual value of the lamp current is essentially zero. 9. Ignition circuit according to claim 7 or 8 or spark ignition, which performs the method according to any of claims 1-6, characterized in that an intelligent control device (5) is programmed to collect in its memory the status data of the lamp. 10. Ignition circuit according to claim 9, characterized in that an intelligent control device (5) sends status data to the receiver upon request. * · 4 I · «4 1 · * · 4 1« · • · · • · · · · · · · M (• «* · · • ♦« • «· · · 4 4 1 ·« 1 «