Voltage transformer

Details Voltage transformer Voltage transformer

1996-08-23

1998-10-06

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323285, 315307, G05F 140

Patent

active

058182055

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The present invention relates to a voltage transformer of the type including a storage reactor, at least one circuit breaker, a sensor for acquiring a current flowing in the storage reactor, and means for comparison of the acquired current with a stipulated threshold value and for switching the circuit breaker when the threshold value is traversed. A technical book by U. Tietze and Ch. Schenk, Semiconductor Circuit Engineering, 9th edition, Springer-Verlag 1989, pages 561-572 describes voltage transformers which transform one direct current voltage into a stipulated direct current voltage at the output. Voltage transformers are based on a clocked switching principle in which the inductive energy stored in an inductive element is fixed depending on the ratio between the make time and the break time of a circuit breaker. The simplest circuits contain simply one circuit breaker and one storage reactor. A smoothing capacitor located at the output of the AC voltage transformer reduces the AC voltage portion in the output voltage. Chapter 18.6.1 of the above mentioned book describes three basic forms of voltage transformers. They are down transformers, up transformers, and inverting transformers. In chapter 18.6.2, an example of a down transformer circuit is shown in which the output voltage is controlled to a stipulated voltage. The control circuit and the modules necessary for driving the circuit breaker are contained in an integrated circuit.


SUMMARY OF THE INVENTION

The object of present the invention is to provide a voltage transformer which can be built especially cost-favorably.
The above object generally is achieved by a voltage transformer including a storage reactor, at least one circuit breaker, a sensor for acquiring a current flowing in the storage reactor, and means for comparison of the acquired current with a stipulated threshold value and for switching the circuit breaker when the threshold value is traversed, and further comprising a timer which, after a voltage jump occurs on the storage reactor as a result of switching of the circuit breaker, keeps the circuit breaker in the existing switching state for the time fixed by timer.


ADVANTAGES OF THE INVENTION

The voltage transformer according to the invention has the advantage that only a few discrete components are necessary. The voltage transformer according to the invention can therefore be built especially cost-favorably. According to the invention it is provided that a sensor for acquiring a current flowing in a storage reactor and means for comparison of the acquired current with a stipulated threshold value are provided. When the threshold value is traversed the circuit breaker is connected. Furthermore, there is a timer which after a voltage jump occurs on the storage reactor keeps the circuit breaker in the existing state for the time fixed by the timer. The voltage jump on the storage reactor occurs as a result of switching of the circuit breaker. The timer fixes the break time or make time of the clocked voltage transformer.
Advantageous developments and embodiments of the voltage transformer according to the invention are described.
According to a first advantageous embodiment of the voltage transformer according to the invention it is provided that when the threshold value is exceeded the circuit breaker is turned off. The timer then keeps the circuit breaker in the off state for the time fixed by the timer. This embodiment is especially advantageous for a fluctuating input voltage.
According to another advantageous embodiment of the voltage transformer according to the invention it is provided that when the threshold value is not reached the circuit breaker is turned on. The timer keeps the circuit breaker in the on state for the time fixed by the timer after the voltage jump has occurred on the storage reactor. In this embodiment the timer fixes the make time of the circuit breaker. This embodiment is especially suited in voltage transformers with an input voltage which is relatively constant.
One especially econom

REFERENCES:
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patent: 4642550 (1987-02-01), Illuzzi et al.
patent: 5402056 (1995-03-01), Ketterling
patent: 5457379 (1995-10-01), Jacobs et al.
patent: 5506493 (1996-04-01), Stengel
patent: 5517399 (1996-05-01), Yamauchi et al.
Engineering!, 9th edition, Springer Verlag 1989, pp. 561-572.
"Aufwarts--/Abwarts-Schaltregler". In: Elektronik, 26/27 Dec. 1985, pp. 57-59.

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