Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Patent
1987-07-07
1990-01-23
Salce, Patrick R.
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
323335, 363 91, G05F 132
Patent
active
048960918
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric power converter.
Electric power converters serve to transform and to provide an electrical power for a load when, in the source of the electrical power such as, for example, the 50 Hz alternating-current network or a solar cell battery, the electrical values such as voltage, frequency, etc. do not correspond to the needs of the consumer. In a broad sense, each power transformer corresponds to a power converter. In a restricted sense, one speaks of power converters if the output values, for example the output voltage, are controlled or automatically regulated.
There are known electric power converters with power capacities of a few watts up to several hundreds of kilowatts and they operate according to an entire series of different principles. The switched mode principle in various variants has asserted itself in the past decade, in particular for the feeding of electronic apparatus of medium power requirements; the latter based on a high degree of efficiency and small construction size.
The automatic regulation of such power converters is predominantly performed by pulse-width modulation or by resonance cells through frequency control. In this case, regular important secondary conditions are to be taken into account, such as switching on and switching off behavior, short-circuit safety, dynamic control behavior in case of sudden load changes, etc. These secondary conditions and their domination are frequently decisive for the technical and economic value of a power converter.
It is the object of the invention to provide a new class of power converters which exhibit substantially improved control properties while essentially retaining the switched mode principle.
This object is solved by using a novel component, as it is described in detail in a patent application, forming a parent application of this application and published as a PCT-application (PCT/CH86/00119) (U.S. Ser. No. 053,367).
In the following, the invention is described in detail by way of example by means of nine figures. In this connection, reference is being made in various instances to the state of the art. They show:
FIG. 1--Schematic representation of a controlled electric power converter
FIG. 2--Schematic representation of an automatically regulated power converter
FIG. 3--Sectional drawing of an actuator
FIG. 4--Symbolic representation of the actuator
FIGS. 5 to 9--Block diagram of various forms of execution of electric power converters.
FIG. 1 shows a first, very schematic and in fact known block diagram of an electric power converter 10, that transmits the power from an arbitrary power source 11 to an also arbitrary load 12. As possible power sources, there are named, among others, the general 50-Hz alternating-current network, a direct-current source fed from said network, i.e. a power rectifier with smoothing filter, a rechargeable battery, a buffered solar-cell battery; as a possible load 12, there is preferred an electric or electronic circuit arrangement, for example, an oscillograph.
The power converter 10 comprises an isolating transformer or power transformer 13 that, on the one hand, galvanically separates the primary side of the converter 10 from its secondary side and, on the other, transforms an alternating current i of a primary-side level to a secondary-side level. The power converter 10 further comprises an actuator 14 over which the power that is supplied to the consumer is adjustable by means of a suitable actuating variable 15.
Preferably, the alternating current i exhibits a frequency w which, due to the size of the transformer 13, is higher than 1 kHz and, due to the acoustical audibility, is higher than 15 kHz. The frequency is upwardly restricted to approximately 100 kHz due to today's material and circuit properties of the actuator 14 and of the transformer 13. However, this value should soon be able to be increased to 1 MHz. The form of the alternating current i can be sinusoidal or, as a chopped direct current, rectangular. Other forms are not customarily used, are however
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Hasler AG
Kasper Horst M.
Peckman Kristine
Salce Patrick R.
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