Isolated converter and led driver using the isolated converter
US11638341B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2020 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Mar 30, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An isolated converter has a transformer with a primary winding (in a primary side circuit) and a secondary winding magnetically coupled to the primary winding. A first Y-capacitor is electrically connected between the primary side circuit and the secondary winding. The detection circuit is for detecting information at the primary side, preferably information about the input supply received at the input, and more preferably the information is that whether the input supply is an alternating current (AC) supply or a direct current (DC) supply, and the detection circuit includes the first Y-capacitor. The detection circuit enables the detected information to be provided directly to a secondary side controller, without needing opto-isolators or other isolated data transmission. The detection circuit (20) comprises a capacitor divider comprising the first Y-capacitor (C5), and further comprising a second impedance and a third capacitor (C7) connected in series with the first Y-capacitor (C5), with the first Y-capacitor (C1), the second impedance, and the third capacitors (C5, C6, C7) in series between a primary side ground (PGND) and the input (12), wherein the detection circuit is for d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.