| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply suppressing the loss in a rectifier by reducing harmonic currents and switching in a high frequency. SOLUTION: The power source 42 reconverting an AC power to a pseudo-sine wave of a desired frequency after converting the power to a DC power comprises a rectifier 46, a switching element 78 for short-circuiting the output of the rectifier 46 with a switching signal, a filter circuit 48 for filtering the output of the rectifier, a PWM controller for converting the DC power of the circuit 48 into a desired frequency, an input voltage detector 84 for detecting a voltage and a current input to the rectifier 46, an input current detector 86, a PAM controller 44 for outputting to the switching element so that the current waveform of the detector 86 simulates to the voltage waveform of the detector 84, a specifier 44 for validating the operation of the element 78 to a zero-crossing point, and a signal corrector 44 for lengthening the period of the signal longer as it approaches nearer to the zero-crossing point. |
