Patent ID: 8072170
Filing Date: 2011-12-06
Classification: F24F,H02H,H02P

Abstract:
1. A motor controller for an air conditioner, comprising: a converter having at least one switching element, the converter converting AC power into DC power by a switching operation of the switching element; an inverter having at least one switching element, the inverter converting the DC power into AC power by a switching operation of the switching element; a microcomputer adapted to output a converter switching control signal that controls the switching element of the converter; and a DC terminal signal generator adapted to detect a DC terminal voltage that is applied across a DC terminal of the converter to sequentially generate a pulse type DC terminal signal and to insulate the DC terminal from the microcomputer, wherein the microcomputer comprises: a switching control signal output unit adapted to output the converter switching control signal to the converter; an error determination unit adapted to determine whether there is an error based on the DC terminal signal; and a stop determination unit adapted to pause an operation of the switching control signal output unit if it is determined there is an error.