| 摘要 |
PURPOSE: A DC type electric mat using a resonant type switching mode power supply device is provided to prevent the resonant type switching mode power supply device from being overheated since a value measured in a temperature sensor is fed back to a control means. CONSTITUTION: A rectifying circuit part(231) changes an AC power source into a direct current. A switching circuit part(232) switches a direct current outputted from the rectifying circuit part to a high frequency. A trans part(233) generates an inductive voltage of AC 24V-48V in a secondary side coil(Ls). An output rectifying circuit part(234) full-wave rectifies the AC power source generated in the secondary side coil of the trans part. A resonance condenser(CR) and a capacity of a primary side coil(Lp) is determined by a frequency outputted from a frequency control circuit(236). |
