Welding power supply with half bridge
First Claim
1. A welding-type power supply, comprising:
- an input circuit, disposed to receive input power, and to provide an intermediate signal;
a dc bus disposed to receive the intermediate signal;
an output circuit, disposed to receive the dc bus, wherein the output circuit provides an ac welding-type output across an electrode output and a work output, and includes a half-bridge inverter having at least a first switch and a second switch, wherein the half bridge inverter is connected to receive power from the dc bus and to provide power to the output, and further wherein the output circuit includes a commutation circuit connected to provide a first freewheeling path that includes a first commutation switch, the electrode output, the work output and a diode antiparallel to the first switch; and
a control module including an inverter control module that provides control signals to the half bridge inverter, and further including a commutation control module that provides modulating control signals to the first commutation switch, wherein the modulating control signals cause the first commutation switch to be turned on and off multiple times during a first single commutation of a current to the first switch, whereby a first rate of change of a current in the output is controlled.
1 Assignment
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Accused Products
Abstract
A method and apparatus for providing welding-type power is disclosed. The apparatus includes an input circuit, a dc bus, an output circuit, and a control module. The input circuit receives power and provides an intermediate signal to the bus. The output circuit receives the dc bus and provides an ac welding-type output. The output circuit includes a half-bridge output inverter with at least first and second switches. The output inverter further includes an output control circuit. The output control circuit provides freewheeling paths that includes control switches, the output, antiparallel diodes. The control module has a four quadrant control module that provides control signals to the half bridge output inverter and provides modulating control signals to the first and second output control switches. The modulating signals cause the output control switches to be turned on and off multiple times to control a rate of change of output current.
11 Citations
10 Claims
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1. A welding-type power supply, comprising:
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an input circuit, disposed to receive input power, and to provide an intermediate signal; a dc bus disposed to receive the intermediate signal; an output circuit, disposed to receive the dc bus, wherein the output circuit provides an ac welding-type output across an electrode output and a work output, and includes a half-bridge inverter having at least a first switch and a second switch, wherein the half bridge inverter is connected to receive power from the dc bus and to provide power to the output, and further wherein the output circuit includes a commutation circuit connected to provide a first freewheeling path that includes a first commutation switch, the electrode output, the work output and a diode antiparallel to the first switch; and a control module including an inverter control module that provides control signals to the half bridge inverter, and further including a commutation control module that provides modulating control signals to the first commutation switch, wherein the modulating control signals cause the first commutation switch to be turned on and off multiple times during a first single commutation of a current to the first switch, whereby a first rate of change of a current in the output is controlled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification