Topic Battery Charger/Design1
Designing rectifier transformer for battery charger 6Vdc, 40dc
Input parameters
| Input | Voltage | 120V, +-10%, 60Hz, sine wave |
| Wire | Al, round, single insulated | |
| Output | Nominal DC output voltage | 6.3Vdc, via central tap, one phase rectifier with 2 diodes |
| Nominal DC output current | 40Adc, via central tap, one phase rectifier with 2 diodes | |
| Wire | Al, round, single insulated, wound bifilar | |
| Core | Steel | M19, alternate stacking, not annealed |
| Bobbin | Type | Single section |
| Design | Insulation class | B, max. operating temperature 120C |
| Criterion of design | 16.6% regulation of the DC output voltage for battery charging between 2.45V/cell and 2.1V/cell | |
| Ambient temperature | 40C |
General rules
1. The cell voltage of an empty battery has amount of 2.1Vdc. If it is full then the voltage is between 2.35Vdc and 2.45Vdc per cell. The criterion of design has to be
Regulation: Regulation = 100 x (2.45-2.1)/2.2 = 16.6%
2. Due to the fact that the allowed regulation is relatively low we have to use only single section bobbin.
3. The transformers with Al wires are bigger, cooler but cheaper.
