Patent ID: 11949346
Assignee: HL MANDO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 11:
12. An inverter apparatus comprising:
an inverter circuit module configured to convert a DC input voltage into an AC voltage, and output the AC voltage;
a filter module connected to the inverter circuit module in series, and configured to supply an AC output voltage obtained by filtering the AC voltage to a load, the filter module including no damping resistor;
a control module configured to calculate a control signal for controlling the inverter circuit module by receiving a feedback on the AC output voltage; and
a switch driver module configured to control switching elements in the inverter circuit module to be turned on or off according to the control signal,
wherein the control module is configured to calculate the control signal by reflecting a virtual damping component corresponding to a value of a virtual damping resistor,
wherein the control module comprises:
a voltage controller configured to output a voltage control signal, based on an error value that is a difference between a reference voltage and the AC output voltage;
a damping controller configured to output a damping control signal, by reflecting the virtual damping component to the AC output voltage; and
a proportional controller configured to calculate the control signal from a signal obtained by subtracting the damping control signal from the voltage control signal, in consideration of the AC voltage; and
wherein the voltage controller is any one of a proportional integral (PI) controller, a proportional differential (PD) controller, and a proportional integral differential (PID) controller.