Hello. I have 2 transformers:
1. Toroidal transformer, primary 230V, secondary 2x15Vac connected in series to have 30V and 100VA total power
2. E+I sheets transformer, same primary, but with only one 30Vac secondary, and 120VA power.
The problem is when powering a load, for example when using the transformer for a variable power supply, the E+I transformer output goes down to 29Vac, and the output of a rectifier and filter, made by a 8A bridge rectifier and 3X2200uF/63V and one 4700uF/80V in parallel is 33Vdc, when powering an 1.6A load.
When using the toroidal transformer to power the same variable power supply with the same rectifier and filter as described above, which is powering the same 1.6A load, the output of the toroidal transformer is 30Vac and the voltage after filtering is 37-38Vdc.
While no load, the output of the 2 transformers are:
1. 31.72Vac
2. 30.51Vac
With 1.8A load the output of E+I transformer is 29.6Vac, and with the same load, the output of the toroidal transformer is 30.2Vac.
My misunderstanding is why the rectified and filtered voltage is lower when using the transformer at point 2, despite its more VA ?
1. Toroidal transformer, primary 230V, secondary 2x15Vac connected in series to have 30V and 100VA total power
2. E+I sheets transformer, same primary, but with only one 30Vac secondary, and 120VA power.
The problem is when powering a load, for example when using the transformer for a variable power supply, the E+I transformer output goes down to 29Vac, and the output of a rectifier and filter, made by a 8A bridge rectifier and 3X2200uF/63V and one 4700uF/80V in parallel is 33Vdc, when powering an 1.6A load.
When using the toroidal transformer to power the same variable power supply with the same rectifier and filter as described above, which is powering the same 1.6A load, the output of the toroidal transformer is 30Vac and the voltage after filtering is 37-38Vdc.
While no load, the output of the 2 transformers are:
1. 31.72Vac
2. 30.51Vac
With 1.8A load the output of E+I transformer is 29.6Vac, and with the same load, the output of the toroidal transformer is 30.2Vac.
My misunderstanding is why the rectified and filtered voltage is lower when using the transformer at point 2, despite its more VA ?