Switching power supply unit
US5932938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1998 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Mar 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply unit controls an output voltage of a power supply without monitoring an output voltage. The switching power supply unit includes a pulse width modulator for generating a control signal to turn on and off a switching transistor. A central processing unit outputs a modulation signal to control the pulse width modulator while sensors detect an input voltage, an output current and a peripheral temperature. A table is used by the central processing unit to store information about a relation between the detected values from the sensors and an ON time of the switching transistor. The central processing unit then selects an ON time of the switching transistor from the table according to values detected by the respective sensors to thereby provide control for switching the switching transistor on and off. The switching transistor is switched according to the selected time and to thereby switch an input voltage in response to changes of an input voltage, an output current and a peripheral temperature without monitoring an output voltage. Furthermore, the output voltage can be maintained with stability at a desired output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.