Capacitor drop type power supply circuit and air conditioner

摘要

To provide a capacitor drop type power supply circuit that can withstand a surge-current generated at power-on by use of inexpensive elements without requiring a complicated circuit configuration. A capacitor drop type power supply circuit includes: an AC power supply (1) connected to a series circuit of a resistor (2), a first capacitor (3), and a first diode (4) whose cathode is connected to the first capacitor (3); a series circuit of a second diode (5) and a Zener diode (6), which is parallel-connected to the first diode (4); and a second capacitor (7) parallel-connected to the Zener diode (6), the circuit outputting a DC voltage generated across the second capacitor (7).