| 摘要 |
<p>An improved switching regulator (12) power supply (150) with a variable duty cycle is disclosed which forms part of a compact Winchester disk drive system (see Figs. 6, 7 and 8) having a storage capacity in excess of 380M bytes of information. The switching regulator is designed for frequencies in excess of 80 kilocycles per second and may therefore be constructed using smaller capacitive (36) and inductive (34) elements. Also, very low heat dissipation and high regulator efficiency may be achieved by the improved power supply to drive a brushless D.C. motor (see Fig. 7), encased within a hard disk assembly where no separate fan or cooling system is used to aid in heat removal. Circuitry (20) is provided to control the motor speed while simultaneously limiting the motorcurrent to a predetermined level.</p> |
