Circuit for supplying current

Details Circuit for supplying current Circuit for supplying current

1997-06-24

1999-08-24

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323224, 323351, G05F 1613, G05F 140, G05B 2402

Patent

active

059428830

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a current-supply circuit for feeding an electrical consumer or load, with, the circuit having a switching regulator that is known from background literature. Corresponding circuits are known, for example, from the technical reference book by J. Beckmann, "Getaktete The switching regulator includes at least one semiconductor power component that is switched completely on or off with a switching signal produced by an actuation circuit. An energy source produces energy with a predetermined output voltage or a predetermined output current through cooperation with inductive and capacitive components. The aforementioned background literature describes current-supply circuits that convert a predetermined input DC voltage into either a smaller or a larger output DC voltage. A DC voltage converter that corresponds to a combination up-down converter is known from the proceedings of the IEEE Power Electronics Specialists Conference in Palo Alto, Calif., Jun. 14-16, 1977. In the known current-supply circuit, the positive terminal of an input DC voltage source is coupled to a first coil. The first coil is connected to a first capacitor. A semiconductor power component alternatingly switches the connecting point between the first coil and the first capacitor, and the connecting point between the first capacitor and a second coil, to a common point between the input DC voltage source and a load. The second coil is in series with the load. A second capacitor is switched in parallel to the load for smoothing. The semiconductor power component can be realized by a transistor connected to the first coil and a diode connected to the second coil, with both the transistor and the diode being switched to the common point between the input DC voltage source and the load.
The output voltage or output current to be predetermined can be varied within specific limits through a corresponding actuation of the at least one semiconductor power component. A large predetermined range is accompanied by the disadvantage that the effectiveness of the current-supply circuit drops in partial ranges. Moreover, the increase in the generation of electromagnetic disturbing radiation, at least in partial ranges, must be taken into account.


SUMMARY AND ADVANTAGES OF THE INVENTION

The current-supply circuit of the invention has the advantage that the voltage or current made available to a load connected to an output of the current-supply circuit can have a wide range.
According to the invention, of a first output, a switching regulator produces an output voltage, which is in a first voltage range, through a switching operation of at least one semiconductor power element. At a second output, an additional circuit produces an output voltage, which is in a second voltage range, from an alternating quantity occurring inside the switching regulator. The second voltage range is higher than the first output voltage range. The two outputs are guided by way of decoupling diodes to a common output, to which the load is connected.
The establishment of two different output currents can be provided instead of the establishment of the two output voltages, with the internal resistance of the load establishing the voltage. The establishment of either the voltages or the currents includes the case that a smaller current is available at the output at which the higher voltage is present.
The essential advantage of the current-supply circuit of the invention lies in the simple embodiment possible with multiplexing of electrical components that are present anyway in the switching regulator having the first output. The coupling out of an alternating quantity for the additional circuit is possible in all converter types. At least the semiconductor power component of the switching regulator can be omitted in the additional circuit. The current-supply circuit of the invention permits the configuration of the switching regulator as, for example, a flow-through converter, while the additional circuit is configured as a bl

REFERENCES:
patent: 4904907 (1990-02-01), Allison et al.
patent: 5412308 (1995-05-01), Brown
patent: 5519306 (1996-05-01), Itoh et al.
patent: 5633579 (1997-05-01), Kim
Franzis-Verlag, 1990, pp. 9-34.
IEEE Power Electronics Specialists Conference in Palo Alto, California, Jun. 14-16, 1977.

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