Solar battery charger question

[Lyker1]

I have just read a data sheet for a solar battery charger which claims to be a PWM type, however the switching frequency was quoted as being only 100Hz. Would I be incorrect if I assumed that this is simply pulse width modulating a series transistor (between the panel and the battery) to keep the battery voltage constant, but that the current consists of pulses from zero to whatever the panel and battery combination turns out to be. I find it hard to except that true switch-mode PSU (buck converter for example) with an output current of 10A can switch at such a low frequency.  Many thanks.

 

[Riccardo1]

Not necessarily. All it means is that it is using PWM as part of the charging process rather than a constant DC. There still may (or not) be some voltage conversion / regulation involved.