g******u
发帖数: 3060 | 1 Hi:
I know it's hardly a technical forum here, forgive me for being desperate.
I designed a non-power factor corrected flyback converter type battery
charger before, it works not bad, about 80% efficiency, 90-240VAC in, 24VDC,
2.5A out. 0.8W no-load loss.
Recently I added a PFC boost stage in the front of the flyback with the
same transformer, the new charger also works, gives the same load, power
factor as high as 0.99, total efficiency 78%.
Its no-load behavior is sort of weird, the no-load l | E*****a
发帖数: 757 | 2 FET热很多，这个按说你用scope看一下电压电流一定容易解决
后面的loss，看看transformer current吧，会不会transformer过热了？
24VDC,
watts
【在 g******u 的大作中提到】
: Hi:
: I know it's hardly a technical forum here, forgive me for being desperate.
: I designed a non-power factor corrected flyback converter type battery
: charger before, it works not bad, about 80% efficiency, 90-240VAC in, 24VDC,
: 2.5A out. 0.8W no-load loss.
: Recently I added a PFC boost stage in the front of the flyback with the
: same transformer, the new charger also works, gives the same load, power
: factor as high as 0.99, total efficiency 78%.
: Its no-load behavior is sort of weird, the no-load l
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