Week 4 Session 5

If the battery voltage is greater than 10 V, then to give power to horn which uses less than 10 V, we need a DC DC converter which will step down the voltage: BUCK CONVERTER is suitable for this application.

Applications of DC DC BUCK CONVERTER

a). To power auxiliary devices(Light, horn, etc.) which require lesser DC than the input DC Voltage.

b). To charge the auxiliary battery from the main battery

Applications of DC DC BOOST CONVERTER

a). Used in regenerating braking of dc motors and battery power system

b). Communication applications and battery charging system

c). Power amplifier applications and automotive equipment

d). Power factor correction circuit

Applications of DC DC BUCK BOOST CONVERTER

a) . For applications which require stepping up operation as well as stepping down operation

b). If a solar cell input is taken to charge a battery, sometimes step up/ step down will be required depending on the output from PV cell.

Applications of DC AC INVERTER

a). To control the operation of AC Traction motor

b). In integrated on board chargers

On‐board battery charger (OBC) and a starter generator system (SGS) are separately used for the HEV. The OBC is necessary for battery charging the HEV by using the grid source commonly provided in households and various control methods for OBC, including battery charging methods. The SGS is composed of a drive inverter with a starter generator. It is necessary for engine starting from an idle stop and to increase driving efficiency of HEVs. In other words, its role is mainly classified into two parts. First, the SGS converts the mechanical energy, such as kinetic energy of the HEV, into the electrical energy for
battery charging. Second, it relieves exhaust emission in case the HEV is stopped briefly while driving in downtown.

Applications of AC DC RECTIFIER

a). In charging device or onboard charger for conversion of ac to dc.

b). Used for power factor correction.