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DEVICE FOR PRESERVING FRESH, DEVICE FOR FRYING, GENERATOR OF SPATIAL POTENTIAL, DEVICE FOR WATER ACTIVATION, DEVICE FOR CULTIVATION, DEVICE FOR DRYING, DEVICE FOR MATURING, DEVICE FOR GROWING
DEVICE FOR PRESERVING FRESH, DEVICE FOR FRYING, GENERATOR OF SPATIAL POTENTIAL, DEVICE FOR WATER ACTIVATION, DEVICE FOR CULTIVATION, DEVICE FOR DRYING, DEVICE FOR MATURING, DEVICE FOR GROWING
A voltage application device (3) provided to this freshness keeping device is provided with: a feedback control circuit (32) which returns, to one terminal (35a) of a primary coil (35) of a transformer (31), one terminal (36a) of a secondary coil (36) of the transformer (31); an output control unit (33) which is connected to another terminal (36b) of the secondary coil (36); and a voltage adjustment unit (41) which switches the voltage value of an AC voltage (VL3) inputted from an AC power supply to a plurality of voltage values, and applies the voltage values to the primary coil (35) to adjust the voltage value of an AC voltage (VL1).
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