Using output drop detection pulses to achieve fast transient response from a low-power mode
US8059429B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 31, 2009 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Dec 31, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly sampled after each pulse. The samples are used to regulate the power supply output voltage (VOUT). Other primary current pulses, however, are of a smaller peak amplitude. These pulses are not used for VOUT regulation, but rather are used to determine whether the VOUT has dropped. In a second aspect, a transient current detector circuit within the PSR controller integrated circuit detects whether an optocoupler current has dropped in a predetermined way. If the TRS current detector detects that the optocoupler current has dropped, then the power supply stops operating in a sleep mode and is made to operate in another higher power operating mode in which the power supply switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.