Optimiser Thanks for your post. Interesting that Tasmania is running 230V the same as New Zealand. However ..
It doesn't make any difference with a SMPS, switched mode power supply, as it can handle a very wide range of AC input voltages and provides a tightly regulated output by its design. The way it works is by rectifying the AC input voltage which is stored in a capacitor. A DC supply of 150 to 400V is obtained. Next a high frequency transformer which is small, is switched using "transistors". The output of the HF transformer is again rectified and smoothed with capacitors to obtain the output voltage. Voltage regulation is obtained by feeding back the output voltage to the switching "transistors" which vary the width, PWM, of the DC pulses going in to the HF transformer. Regulation is almost instantaneous but extra capacitance on the output is better. There's limited space in the SMPS for large capacitors.