초록 ▼

An inverter for producing a one or three phase output with neutral is disclosed. An LC resonant circuit is selectively switched by an inverter to produce one or three phases having a fundamental frequency equal to the frequency of each switching circuit within the phases of the inverter. The outputs

An inverter for producing a one or three phase output with neutral is disclosed. An LC resonant circuit is selectively switched by an inverter to produce one or three phases having a fundamental frequency equal to the frequency of each switching circuit within the phases of the inverter. The outputs are filtered to remove higher harmonics to pass the filtered output to the load. Energy is fed back into the resonant circuit by short circulating the switching circuits at the time that the ouput voltage across a switching circuit is zero to minimize switching losses.

대표청구항 ▼

An inverter for producing an output signal at a fundamental frequency for connection to a load with a load neutral comprising: (a) a DC power supply means for providing a DC potential; (b) a first LC circuit, coupled to the DC power supply means, having a resonant frequency and resonating at the res

An inverter for producing an output signal at a fundamental frequency for connection to a load with a load neutral comprising: (a) a DC power supply means for providing a DC potential; (b) a first LC circuit, coupled to the DC power supply means, having a resonant frequency and resonating at the resonant frequency when the DC potential is applied to the first LC circuit to cause current flow between the DC power supply means and the first LC circuit; (c) a second LC circuit, coupled to the DC power supply means, having the resonant frequency and resonating at the resonant frequency when the DC potential is applied to the second LC circuit to cause current flow between the DC power supply means and the second LC circuit; (d) first switching means having a conductivity controlled by a first control signal, coupled to the first LC circuit and the load, and having a first conductivity state permitting current to flow from the first LC circuit to the load and a second conductivity state blocking current flow to the load; (e) second switching means having a conductivity controlled by a second control signal, coupled to the second LC circuit and the load, and having a first conductivity state permitting current to flow from the second LC circuit to the load and a second conductivity state blocking flow to the load; and (f) control means for generating the first and second control signals to cause the first and second conductivity states of the first switching means to cyclically vary at a fundamental frequency and to cause the first and second states of the second switching means to cyclically vary at the fundamental frequency with the first and second control signals being 180°out of phase with each other and the fundamental frequency being lower than the resonant frequency.