PWM control circuit for the post-adjustment of multi-output switching power supplies
US6885176B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2003 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Aug 16, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33561
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A multi-output switching power supply may include a PWM regulator circuit arranged in cascade upstream of each output to receive, as an input, a square wave voltage signal with a predetermined duty cycle. The regulator circuit may include an auxiliary switching device for modulating the duty cycle of the input signal to supply, as an output, a regulated direct current voltage. A control circuit for the PWM regulator circuit may include a detector circuit for detecting the trailing edges of the voltage signal input to the regulator circuit which emits a pulse coinciding with each of the trailing edges. The control circuit may also include a ramp signal generator that is controlled by the emitted pulses. The ramp signal generator may be connected to the non-inverting input of a comparator having an inverting input for receiving a signal indicative of the error in the regulator output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.