Patent ID: 6504484
Filing Date: 2003-01-07
Classification: H02H

Abstract:
A control method using power to prevent overheat inside of an electric equipment comprising the steps of:(1) when a detecting value (TA) is greater than a first temperature setting value (TS1) plus a setting difference value (X), namely, TA>TS1+X, the load is unloaded to a first grade of power (P1); (2) when said detecting value (TA) minus a second temperature setting value (TS2) is equal to a second temperature setting difference value (&Dgr;T2), and said second temperature setting difference value (&Dgr;T2) is greater than a first temperature setting difference value (&Dgr;T1) plus said setting difference value (X), namely, TAâˆ’TS2=&Dgr;T2, and &Dgr;T2>&Dgr;T1+X, then the load is continuously unloaded to a second grade of power (P2), then, when said detecting value (TA) sequentially minus each grade of temperature setting value (TS3 . . . TSn) is equal to each grade of temperature setting difference value (&Dgr;T3 . . . &Dgr;Tnâˆ’1, &Dgr;Tn), and each grade of said temperature setting difference value (&Dgr;T3 . . . &Dgr;Tnâˆ’1, &Dgr;Tn) is greater than a former grade of temperature setting difference value (&Dgr;T4 . . . &Dgr;Tnâˆ’2, &Dgr;Tnâˆ’1) plus said grade of setting difference value (X), namely, TAâˆ’TSn=&Dgr;Tn, and &Dgr;Tn>&Dgr;Tnâˆ’1+X, then the load is successively unloaded to a minimum power (Pmin); (3) when said detecting value (TA) minus a first reload temperature setting value (TSâ€²1) is equal to a first reload temperature setting difference value (&Dgr;Tâ€²1), and said first reload temperature setting difference value (&Dgr;Tâ€²1) is smaller than a temperature setting difference value (&Dgr;Tâ€²) minus said setting difference value (X), namely, TAâˆ’TSâ€²1=&Dgr;Tâ€²1, and &Dgr;Tâ€²11), then, when said detecting value (TA) sequentially minus each grade of reload temperature setting value (TSâ€²2 . . . TSâ€²n) is equal to each grade of reload temperature setting difference value (&Dgr;Tâ€²2 . . . &Dgr;Tâ€²nâˆ’1, &Dgr;Tâ€²n), and each grade of said reload temperature setting difference value (&Dgr;Tâ€²2 . . . &Dgr;Tâ€²nâˆ’1, &Dgr;Tâ€²n) is smaller than a former grade of reload temperature setting difference value (&Dgr;Tâ€²1 . . . &Dgr;Tâ€²nâˆ’2, &Dgr;Tâ€²nâˆ’1) minus said grade of setting difference value (X), namely, TAâˆ’TSâ€²n=&Dgr;Tâ€²n, and &Dgr;Tâ€²n>&Dgr;Tâ€²nâˆ’1âˆ’X, then the load is successively reloaded to a maximum power (Pmax).