Circuit and method for adaptive leading edge blanking in pulse width modulated current mode switching power supply controllers
US6219262A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 2000 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | May 8, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0038
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A current sensing device incorporated into the gate charge current path of the power transistor in a typical pulse-width modulated current mode switching power supply controller provides adaptive leading edge blanking of the current-sense waveform present in the feedback signal to prevent erroneous response in the feedback control circuitry and improve regulation of the power supply output voltage. A serial switch located within the current-sense feedback signal path is directly controlled by the current sensing device to open and close the signal path and generate a blanking interval which is optimally aligned to blank out or remove the leading edge spike in the current-sense waveform which corresponds to the gate charge current pulse that occurs during the turn-on transition of the power transistor. The optimal alignment of the blanking interval is an inherent feature of the current sensing device since the device utilizes the gate charge current pulse to define the timing of the opening and closing of the serial switch. Furthermore, the current sensing device is inherently responsive to variables such as the transistor's Miller capacitance or other manufacturing process and temp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.