Current negative-feedback circuit and DC-DC converter using the circuit
US8098059B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2009 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Jul 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A current negative-feedback circuit comprises a current detection unit and a sawtooth-shaped waveform generation unit. The current detection unit comprises a first P-ch MOSFET Q2 and a second P-ch MOSFET Q3 which constitute a current mirror circuit, a current adjustment resistor R4, a current detection resistor R1, and a constant current source I1. The current mirror circuit outputs current almost proportional to the charge current of an inductance via a switching device or outputs a current which is the quadratic function of the charge current of an inductance. The sawtooth-shaped waveform generation means adds the constant charge current of the constant current source I2 and the current output from the current mirror circuit, charges the capacitor C1, and generates a sawtooth-shaped waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.