Controllable converter power supply
First Claim
1. A power supply for providing an output to a load comprising:
- a first source of dc power having a first non-zero voltage;
a converter in electrical communication with the source of dc power and capable of being connected to the load;
a second source of dc power having a second non-zero voltage; and
at least one controllable switch, capable of connecting the first and second sources of dc power, in an additive, and non-parallel arrangement across the input of the converter, wherein the voltage applied to the converter input is the sum of the voltages of the first and second non-zero voltages.
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Accused Products
Abstract
In accordance with the present invention a power supply for providing an ac/dc output to a load is disclosed. The power supply includes a first source of dc power and an inverter that provides an ac output to the load. A second source of dc power is provided and selectably connects the first and second sources of dc power in series with the load when the output current reverses. In one embodiment the power sources are connected in series with every output current reversal. The first source of dc power is controllable and the magnitude of the dc current is responsive to a current reference signal. A control circuit provides the current reference signal, wherein the current reference signal is pulsed immediately prior to the ac output reversing polarity. The first source of dc power source preferably includes a buck converter that is switched at a variable frequency, depending upon the desired output current. In the event the user selects either an ac or dc electrode negative output a period of electrode positive dc energy is provided at start up to help establish the arc.
59 Citations
14 Claims
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1. A power supply for providing an output to a load comprising:
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a first source of dc power having a first non-zero voltage; a converter in electrical communication with the source of dc power and capable of being connected to the load; a second source of dc power having a second non-zero voltage; and at least one controllable switch, capable of connecting the first and second sources of dc power, in an additive, and non-parallel arrangement across the input of the converter, wherein the voltage applied to the converter input is the sum of the voltages of the first and second non-zero voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power supply for providing an ac output to a load comprising:
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a converter having a source of first source of non-zero dc voltage; an inductor in series with the converter; a second source of non-zero dc voltage; and a switch capable of connecting the substantially dc voltage and the second source of dc voltage in an additive, non-parallel arrangement across the input of the converter, wherein the voltage across the converter is clamped by the first and second dc source of voltage, and wherein the voltage applied to the converter input is the sum of the voltages of the first and second sources. - View Dependent Claims (11, 12, 13, 14)
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Specification