Abstract: A secondary cell degradation state judgment system which includes: operation information measurement means (5) measuring operations information on a secondary cell (3) such as a temperature, an elapse time, a discharge depth, and a discharge capacitance of the secondary cell; degradation value calculation means (7) which calculates degradation values (15) respectively corresponding to the measurement values according to the measurement values; degradation accumulation value storage means (8) which stores degradation accumulation values (14) accumulated for each of the calculated degradation values; main accumulation value selection means (9) which selects the greatest degradation value as a main accumulation value (16) from the degradation accumulation values; and overall degradation value calculation means (10) which calculates an overall degradation value (18) according to the selected main accumulation value and a degradation value corresponding to the degradation accumulation values which have not been se

Abstract: An object of the present invention is to provide a computer power supply in which, by improving the circuit itself, internal heat loss can be reduced, thereby greatly improving efficiency. A partial resonance circuit 8 is constituted by a primary side winding N1 of a high frequency transformer 3, a resonance condenser 7, and two switching elements Q1, Q2, a secondary side output circuit 4 for driving a load is connected to a secondary side of the high frequency transformer 3 via a winding, and a reverse converter 11 for driving and halting the first switching element and second switching element by causing the respective phases thereof to differ on the basis of a driving signal is provided.

Abstract: An object of the present invention is to provide a power supply device that permits high efficiency and miniaturization, that makes the constitution of a power supply device advantageous from a cost perspective and an assembly work standpoint, and that also allows the cooling fan to be changed rapidly. A protective member H is mounted so as to be displaceable to a removal disabling position in which the protective member H obstructs the removal of the cooling fan F by abutting against the cooling fan F, and to a removal enabling position that permits removal of the cooling fan F. Stopper members, which serve to obstruct movement of the protective member H to the removal disabling position by abutting against the protective member H in a state where the cooling fan F is not disposed in a predetermined position, are provided.

Abstract: An object of the present invention is to provide a computer power supply in which, by improving the circuit itself, internal heat loss can be reduced, thereby greatly improving efficiency. A partial resonance circuit 8 is constituted by a primary side winding N1 of a high frequency transformer 3, a resonance condenser 7, and two switching elements Q1, Q2, a secondary side output circuit 4 for driving a load is connected to a secondary side of the high frequency transformer 3 via a winding, and a reverse converter 11 for driving and halting the first switching element and second switching element by causing the respective phases thereof to differ on the basis of a driving signal is provided.