Electrical transmission or interconnection systems – Plural load circuit systems – Control of current or power
Patent
1998-05-29
1999-12-21
Paladini, Albert W.
Electrical transmission or interconnection systems
Plural load circuit systems
Control of current or power
307 30, 315 77, 315DIG7, 323299, H05B 3702
Patent
active
06005302&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a clocked power supply circuit having an at least intermittently active load that is independent of a consumer, (e.g., a particular load) in particular for supplying power to gas discharge lamps as consumers.
BACKGROUND INFORMATION
In German Patent No. 42 31 968.4 A1, a clocked power supply circuit is described in which on the output side there is an at least intermittently active load that is independent of the electrical consumer, preferably a gas discharge lamp. The arrangement comprises contains a dc/dc converter, which is connected by way of switching elements to a dc power supply. The switching signals for the switching elements are made available by a control arrangement as a function of the load condition existing on the output side. In this known power supply circuit, only one voltage is available on the output side. If the consumer is a gas discharge lamp, then to ignite it, a much greater ignition voltage is needed in comparison to the operating voltage. In the known power supply circuitry, this voltage is applied by injection of an appropriate ignition pulse by means of a transformer to be specially provided. According to the known power supply circuit, after the ignition circuit reaches the specified voltage, it outputs an ignition pulse to the smoothing capacitor. This means that the output voltage has to be boosted to this elevated value. In this known power supply circuit, the load can be switched off and has a capacitor connected in outgoing circuit. Its stored energy is not sufficient to provide the energy required within a short time, to end the ignition process with certainty after said ignition process is introduced. Due to the load having the at least intermittently active converter load, a current is applied to it and the energy stored inductively in the secondary winding will be made available after the ignition to cover the elevated power requirement of the lamp. In accordance with the objective, the at least intermittently active converter load in this known array is active for the period following ignition, until its completion.
This is not the case in the circuit according to the present invention. Rather, here, it is not the ignition, but rather the time until ignition, which is quite significant to the operation of the intermittently active converter load.
SUMMARY OF THE INVENTION
The clocked power supply circuit of the present invention having an at least intermittently active load, that is independent of a consumer, in particular for the power supply of gas discharge lamps, as consumers, has the advantage compared thereto of the provision of two voltages, of which in each case one is regulated, wherein the voltage difference between these two voltages is sufficient for the provision of the ignition supply voltage and the thereby required speed of provision of the rated voltage is assured. This is possible in a low-cost implementation.
According to the present invention, this is achieved in principle, in that the transformer of the dc/dc converter is designed so that two voltages of differing polarity and magnitude can be tapped off from the output side, at least one of these voltages is regulated and provided for a power supply during operation of the consumer, and the at least intermittently active load can be switched to the regulated voltage.
In the preferred application of the power supply circuit designed according to the present invention for the energy supply to gas discharge lamps and their ignition device, the following discussion is essential. Based on the internal circuit design of the ignition device, a close tolerance supply voltage of, e.g., 460 V is needed to assure an orderly function. After the application of this supply voltage to the ignition device, the ignition voltage will build up within a short time. Due to the low loading which the ignition device represents up to the moment of ignition of the lamp, the situation is similar to an idle, and the converter has a very small load. A certain ti
REFERENCES:
patent: 4748398 (1988-05-01), Laue
patent: 5541500 (1996-07-01), Krahl
patent: 5552674 (1996-09-01), George et al.
patent: 5625258 (1997-04-01), Preis
patent: 5631546 (1997-05-01), Heinke
Borho Lothar
Decker Gerhard
Eckert Klaus
Kern Robert
Preis Karl-Heinrich
Paladini Albert W.
Robert & Bosch GmbH
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