Clocked power supply circuit with auxillary load

Details Clocked power supply circuit with auxillary load Clocked power supply circuit with auxillary load

1995-04-13

1996-09-03

Pascal, Robert

Electric lamp and discharge devices: systems

Special application

Vehicle

315289, 315DIG7, H05B 3700

Patent

active

055526748

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention proceeds from a clocked power supply circuit, in particular for the energy supply of gas discharge lamps, which has a control arrangement which provides switching signals for switching means as a function of a load condition present on the output side, and which has at least one inductive element. Exemplary clocked power supply circuits are known from the textbook by U. Tietze and C. H. Schenk, "Halbleiterschaltungstechnik" ("Semiconductor circuit engineering"), 6th Edition, Springer-Verlag 1983, pages 545 to 552, and respectively include at least one inductive element and one control arrangement. The control arrangement provides switching signals for switching means as a function of a load condition present on the output side. The control arrangement is included in a control loop whose task is to keep at least approximately constant the output voltage or the output current of the clocked power supply circuit. The control loop reacts to a change in the load condition with a system-induced settling time. A change in the load condition occurs, in particular, at the instant when electric consumers or loads are switched on. A gas discharge lamp represents a particularly critical load in this respect. In the case of a gas discharge lamp, in particular a high-pressure gas discharge lamp, it is necessary to ensure a rapid supply of energy after the initiation of the ignition process so that the lamp is not immediately extinguished again.
DE-U 901 567 4.9 discloses a clocked power supply circuit which in accordance with a first exemplary embodiment achieves this object by means of a series circuit, provided on the output side, of a capacitor with a coil. The capacitive energy stored in the capacitor ensures a rapid feeding of energy after the initiation of the ignition process of the gas discharge lamp. The coil limits the temporal current variation to a prescribed value and thereby prevents a sudden discharge of the capacitor. The high requirements placed on the coil and on the capacitor both with regard to voltage endurance and permissible maximum current, and also with respect to temporal voltage variation and temporal current variation necessitate the use of high quality components which are correspondingly expensive.


SUMMARY OF THE INVENTION

It is the object of the invention to provide a clocked power supply circuit which renders possible a rapid reaction to a change in the load condition.
The above object is achieved by a clocked power supply circuit, in particular for the energy supply of gas discharge lamps, which has a control arrangement which provides switching signals for switching means as a function of a load condition present on the output side, which has at least one inductive element, and which on the output side, is provided with a further load, in addition to and independent of the primary gas discharge lamp load, which further load, when the gas discharge lamp is turned off, makes available a predetermined load condition for the clocked power supply.


ADVANTAGES OF THE INVENTION

The measure provided according to the invention to provide on the output side of the supply a further load which is independent of the consumer or lamp load and is active at least temporarily renders it possible to store energy in the inductive element of the power supply circuit, with the result that an additional component is eliminated. The stored inductive energy is immediately available when required. The at least temporarily active load renders it possible to operate the power supply circuit independently of the condition of the electric consumer up to full load, thus eliminating a system-induced settling process from no-load operation to full-load operation.
The clocked power supply circuit provided according to the invention is suitable, in particular, for the energy supply of high-pressure gas discharge lamps which after the initiation of the ignition process have a power requirement which is increased with respect to the stationary operating condition, it is necessary to supply th

REFERENCES:
patent: 4095139 (1978-06-01), Symonds et al.
patent: 4410837 (1983-10-01), Suzuki et al.
patent: 5046152 (1991-09-01), Bartscher
patent: 5343125 (1994-08-01), Bernitz et al.

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