Buck-boost regulated D.C. to D.C. power supply
US4549254A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1983 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Feb 3, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P15/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A regulated power supply for supplying DC output voltage and current to an electronic control system of an internal combustion engine, designed especially for automotive applications and cold cranking conditions encountered therein, is disclosed. The power supply has a series switching regulator section having a transformer provided with two windings, and a shunt switching regulator section that shares the transformer with the series regulator section. When normal battery voltages are available, the power supply through its series regulator section operates in a voltage dropping mode, intermittently passing current through the primary winding of the transformer to maintain the desired output voltage. When low battery voltages are encountered, such as during cold cranking conditions, the shunt regulator section of the power supply operates in a voltage boosting mode to maintain the desired output voltage. The voltage boosting function is accomplished by intermittently shunting current from the primary winding towards ground, and utilizing the resultant magnetic energy stored in the core of the transformer to boost the voltage available to the load. Mutual inductance between the prim…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.