Inverter, inverter control method, and program
AssigneeOMRON Corporation
InventorQian ZHAO
Life of this patent
Estimating the term…
Abstract
An inverter converts DC power into three-phase AC power using a power conversion circuit with three legs, each corresponding to a phase. Each leg contains two switching elements. A controller manages switching control of these elements based on a PWM modulation method to regulate power conversion and output. The controller generates a PWM modulation signal to sequentially modulate only two of the three phases. For one phase, both switching elements in its leg undergo modulation. For another phase, only one switching element in its leg is modulated while the other is fixed to OFF. For the remaining phase, the switching elements in its leg are fixed to complementary ON or OFF states. This method ensures efficient and sequential control of power conversion across the three phases.
Claims5
An inverter configured to convert DC power into three phase AC power and output the three phase AC power, the inverter comprising:
- a power conversion circuit including three legs corresponding to three phases, respectively, each of the three legs including two switching elements;
- and
- a controller configured to perform switching control on each of the switching elements to control the conversion and the output based on a PWM modulation method, wherein
- the controller generates a PWM modulation signal configured to sequentially modulate only two phases of the three phases
- by performing the switching control on both of the two switching elements included in one of the three legs for any one of the three phases,
- performing the switching control on only one of the two switching elements included in another one of the three legs and fixing another switching element to OFF for another one of the three phases, and
- fixing the two switching elements included in a remaining one of the three legs to complementarily ON or OFF for a remaining one of the three phases.
A control method for an inverter, the inverter including a power conversion circuit including three legs each including two switching elements, and the inverter being configured to convert DC power into three phase AC power using the power conversion circuit and output the three phase AC power, the control method comprising:
- performing PWM modulation configured to sequentially modulate only two phases of three phases
- by performing the switching control on both of the two switching elements included in one of the three legs for any one of the three phases,
- performing the switching control on only one of the two switching elements included in another one of the three legs and fixing another switching element to OFF for another one of the three phases, and
- fixing the two switching elements included in a remaining one of the three legs to complementarily ON or OFF for a remaining one of the three phases.
Dependencies are inferred from the claim text.