Patent ID: 8897043

Claim:
A power conversion apparatus comprising: a converter which receives AC voltage as an input, and converts the AC voltage into a DC voltage without full-wave rectification by turning on and off a first switching element which operates when the AC voltage is positive, and a second switching element which operates when the AC voltage is negative; and a controller which receives the AC input voltage, an alternating input current to the converter, and the DC voltage, as inputs, determines a pulse width of a first pulse signal to turn on the first switching element, and a pulse width of a second pulse signal to turn on the second switching element, and sends the first pulse signal and the second pulse signal to the converter, the controller including: a generator that generates a signal to control the alternating input current to be sinusoidal, from the AC input voltage and a difference voltage of the DC voltage to a reference voltage, and a determinator that compares a detection signal of the alternating input current with the signal generated by the generator, and determines pulse widths of the first pulse signal and second pulse signal, wherein the generator comprises: a resistance divider circuit to divide a potential difference between a rated voltage and the AC input voltage, and an inverting amplifier circuit to invert he voltage divided by the resistance divider circuit, and wherein the generator generates a first signal to control the alternating input current to be sinusoidal, from the difference voltage and AC input voltage, when the AC input voltage is positive, and generates a second signal to control the alternating input current to be sinusoidal, from the difference voltage and voltage inverted by the inverting amplifier circuit, when the AC input voltage is negative, and the determinator compares a negative signal of the alternating input current with the first signal, and generates the first pulse signal, and compares a positive signal of the alternating input current with the second signal, and generates the second pulse signal.