US 6,549,441 B1Granted

Voltage switch-over device

AssigneeFronius Schweissmaschinen Produktion GmbH & Co. KG

InventorsHubert Aigner, Alfred Hiesmayr, Friedrich Oberzaucher, Walter Pammer

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Abstract

The invention relates to a voltage switching device (23) consisting of a power rectifier (26), a boost chopper (34, 35) having at least one storage element (50, 51), a transformer (40), a switching device (59), a control device (4) and a plurality of mains leads (27 to 29), the power rectifier (26) being connected to an energy source (24) by the mains leads (27 to 29) and a consumer (25) with a secondary winding (42) of the transformer (40), a power evaluating device (32) supplied with voltage from the energy source (24) being provided, the output of which is connected to the switching device (59) or to the control device (4). A boost chopper (34, 35) is provided respectively in a positive and a negative supply line (30, 31) from the power rectifier (26), the storage elements (50, 51) provided in the boost choppers (34, 35) each being connected independently of one another to a respective high frequency inverter (36, 37), the high frequency inverters (36, 37) being connected respectively to a primary winding (38, 39) of one or more transformers (40).

Claims18

Dependent claims

A voltage switching device comprising

(a) a power rectifier connected to a positive supply line and a negative supply line,
(b) a boost chopper arranged in each supply line, each boost chopper comprising a choke, a switching element, a diode and a storage element,
(c) at least one transformer having a primary winding and a secondary winding,
(d) a switching device for switching the boost choppers in series or in parallel, depending on a voltage delivered by an energy source,
(e) a control device, the switching elements having inputs connected to the control device for controlling the boost choppers,
(f) a plurality of mains leads connecting the power rectifier to the energy source,
(g) a consumer connected to the secondary winding of the transformer,
(h) a power evaluating device for evaluating the value of the voltage delivered by the energy source, the power evaluating device having an output connected to the switching device or the control device, and
(i) a high frequency inverter independently connected to each storage element, and each high frequency inverter being connected to the primary winding of the transformer.

6 more elements

Dependencies are inferred from the claim text.