SPLIT PHASE SYNCHRONIZATION OF WELDER/CUTTER INVERTER MODULES FOR RIPPLE IMPROVEMENT
A modular power supply is provided. The modular power supply includes multiple inverters and a controller. Each inverter is configured to receive an input voltage and provide an output to a load. The controller is configured to provide a synchronization signal to each inverter of the plurality of inverters.
1 . A modular power supply comprising:
a first module including a first converter and a first inverter, the first converter providing a first converter output to the first inverter;
a second module including a second converter and a second inverter, the second converter providing a second converter output to the second inverter; and
a controller providing a first synchronization signal to the first inverter and a second synchronization signal to the second inverter.
2 . The power supply according to claim 1 , wherein the controller synchronizes the first inverter to be a specified number of degrees out of phase with the second inverter.
3 . The power supply according to claim 1 , wherein the first module includes a first capacitance between a positive line and a negative line of the first converter output.
4 . The power supply according to claim 1 , wherein the first module includes a third converter and the second module includes a fourth converter.
5 . The power supply according to claim 1 , wherein the first converter is an AC to DC converter.
6 . The power supply according to claim 1 , wherein the first module is connected to a load through a first inductor.
7 . The power supply according to claim 1 , wherein the second module is connected to a load through a second inductor.
8 . The power supply according to claim 1 , wherein the first and second inductors are in a parallel electrical connection.
9 . A modular power supply comprising:
a plurality of inverters configured to receive an input voltage and provide an output to a load; and
a controller providing a synchronization signal to each inverter of the plurality of inverters, the controller determining a phase of each inverter such that each phase is equally spaced throughout a cycle.
10 . The power supply according to claim 9 , wherein the inverter phase spacing is defined by:
phase spacing=360°/(number of inverter pulses per cycle*number of inverters).
11 . The power supply according to claim 9 , wherein each inverter is configured to receive the input voltage from a corresponding first converter, a capacitance being connected between a positive input line and a negative input line of the inverter.
12 . The power supply according to claim 11 , wherein each inverter is configured to provide an output voltage to a corresponding second converter.
13 . The power supply according to claim 12 , wherein each second converter is configured to provide a voltage to a load in parallel.
14 . The power supply according to claim 13 , wherein each second converter is configured to provide a voltage to a load through a corresponding inductor.
15 . The power supply according to claim 12 , wherein the first converter is an AC to DC converter.
16 . The power supply according to claim 15 , wherein the second converter is an AC to DC converter.