Switching regulator provided with error amplifier circuit having overcurrent protecting function
US4263643A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Aug 30, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/3385
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching regulator in which a DC input voltage is chopped by an oscillator applied to a transformer the output of which in turn is rectified by a rectifier circuit; a DC voltage derived from the rectifier is compared with a reference voltage so that a voltage is produced which corresponds to the deviation from said reference voltage of the aforementioned DC voltage derived from the rectifier; the voltage thus produced is amplified by means of an error amplifier; a current proportional to the transformer driving current provided by the oscillator is detected by a current detector; and the output of the error amplifier is compared with the output of the current detector so that only when the former exceeds the latter, a trigger signal is applied to the oscillator, whereby the oscillation of the oscillator is changed from an ON state to an OFF state. In such a switching regulator, there is provided circuitry for limiting the operation range of the aforementioned error amplifier by the difference between a voltage proportional to said DC voltage derived from the rectifier and a voltage proportional to the input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.