Buck/boost circuit that charges and discharges multi-cell batteries of a power bank device
US9479004B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2015 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Jul 22, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2207/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power bank device has a single circuit topology involving a DC-to-DC converter and four transistors so that this single topology can be used both to charge battery cells with a regulated current in a charging step-up boost mode and to drive a regulated voltage onto a power bank voltage output node in a discharging step-down buck mode. In one example, the circuit includes a first transistor coupled to conduct current between a battery voltage node and a switch node SW, a second transistor coupled to conduct current between the SW node and a ground node, and third and fourth transistors coupled in series to conduct current between a voltage input node and the voltage output node. The inductor of the converter is coupled between the SW node and the voltage output node, and the output capacitor of the converter is coupled between the voltage output node and the ground node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.