Patent ID: 6646849
Filing Date: 2003-11-11
Classification: H02M

Abstract:
A method of controlling a digital electric power inverter, said method is characterized by that:a. said digital electric power inverter is controlled interiorly by a CPU, an overload detecting circuit, a current detecting circuit, a voltage detecting circuit and a temperature detecting circuit are provided between said CPU and an output loop; b. said digital electric power inverter is provided interiorly thereof with a PWM driving circuit, an AC driving circuit, a voltage regulation circuit, a PWM converting circuit, a rectifying circuit and a DC/AC inverting circuit; c. said CPU controls by cooperation the working of said overload detecting circuit, and turns off output in time before the output power makes the elements of said electric power inverter crumbled, a short time after restoration, said CPU turns on output again; d. in a mode of continuous on/off outputting, said CPU clearly distinguishes a short circuit from a false short circuit according to variation of output current detected, and makes suitable disposing of deciding whether power supplying is continued; e. the process of c. is repeated again and again intermittently to protect said elements from being damaged, and the normal working power for a machine load is afforded, the larger actuating power for the machine is provided; f. said circuits built in said CPU has normal values within their working scopes; g. said CPU actively controls and compares the situations of said circuits to adjust said output PWM signals and AC driving signals of them in pursuance of the loading state of working of loops.