Method for switching off a switched-mode power supply in the event of short-circuit, and a switched-mode power supply
US6434023B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2001 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Jan 17, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/335
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In order to achieve complete short-circuit protection irrespective of a location of a short-circuit in a switched-mode power supply having a controllable switch in a primary circuit, the controllable switch is opened when a voltage drop across an electrolytic capacitor in a primary circuit falls below a threshold value which can be predetermined. For this purpose, a capacitive voltage device containing two capacitances is connected in parallel with the electrolytic capacitor. A potential at a center tap of the capacitive voltage divider is compared in a comparator with a reference voltage, which opens the controllable switch when the potential at the center tap falls below the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.