Title:
【発明の名称】調整された反転電力供給装置
Document Type and Number:
Japanese Patent JP3420242
Kind Code:
B2
Abstract:
An inverting power supply (10) having first and second charging capacitors (22, 24) that are alternately connected to a positive power source (12) and a negative output terminal (18) which is to be maintained at a negative voltage with respect to a common ground for the power source and the power supply. Switches (34, 36) connect a positive plate of each charging capacitor to the power supply positive terminal during alternate half cycles of a two-phase clock (20) and charge is bled from the positive plates by switching transistors (46, 50) during the other half cycle to enable charge to be transferred via diodes (52, 54) from the negative output terminal to negative plate of the charging capacitors during the other half cycle. The base-emitter currents of the switching transistors are controlled by a charge transfer control circuit (56) in relation to the voltage at the negative output terminal to regulate the voltage at the negative output terminal by controlling the rate of charge transfer to the negative output terminal. Additional regulation can be provided by a current control circuit (106) that adjusts the switching transistor base-emitter currents in relation to the collector currents of the switching transistors.
Inventors:
Jeans, Donald W.
Application Number:
JP51671595A
Publication Date:
June 23, 2003
Filing Date:
December 14, 1993
Export Citation:
Assignee:
Seagate Technology LLC
International Classes:
H02M3/07; G11B5/39; (IPC1-7): H02M3/07; G11B5/39
Domestic Patent References:
| JP446556A | ||||
| JP18865A |
Other References:
【文献】欧州特許出願公開489412(EP,A1)
Attorney, Agent or Firm:
Akira Asamura (3 outside)