Driving capacitive loads with an H bridge
in [Design]
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From: markp on 21 Jul 2010 07:48 Hi All, I need to drive capacitor with a triangle wave with no DC across the capacitor (i.e. a symmetrical bipolar drive but triangular) but it has to be efficient, i.e some kind of energy retrieval. Is it possible to use standard H bridge circuits to do this? Does anyone have any links or app notes? Thanks! Mark.
From: John Fields on 21 Jul 2010 09:50 On Wed, 21 Jul 2010 12:48:55 +0100, "markp" <map.nospam(a)f2s.com> wrote: >Hi All, > >I need to drive capacitor with a triangle wave with no DC across the >capacitor (i.e. a symmetrical bipolar drive but triangular) but it has to be >efficient, i.e some kind of energy retrieval. --- What are you trying to do? JF
From: Tim Williams on 21 Jul 2010 10:44 Assuming you mean triangle voltage waveform (= square current waveform), you can do this with an H bridge and an arbitrarily large inductor in series with the supply. You will actually have an arc segment of the LC oscillation, so you need a big L to make the frequency low enough that the arc looks straight. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "markp" <map.nospam(a)f2s.com> wrote in message news:8ao4m9F7alU1(a)mid.individual.net... > Hi All, > > I need to drive capacitor with a triangle wave with no DC across the > capacitor (i.e. a symmetrical bipolar drive but triangular) but it has to be > efficient, i.e some kind of energy retrieval. > > Is it possible to use standard H bridge circuits to do this? Does anyone > have any links or app notes? > > Thanks! > Mark. > >
From: markp on 21 Jul 2010 10:58 "John Fields" <jfields(a)austininstruments.com> wrote in message news:jlud46hi4c0qu507cpb11465jgi3fs4ndo(a)4ax.com... > On Wed, 21 Jul 2010 12:48:55 +0100, "markp" <map.nospam(a)f2s.com> > wrote: > >>Hi All, >> >>I need to drive capacitor with a triangle wave with no DC across the >>capacitor (i.e. a symmetrical bipolar drive but triangular) but it has to >>be >>efficient, i.e some kind of energy retrieval. > > --- > What are you trying to do? > I can't really say as I'm under NDA, suffice it to say the load is mostly capacitive (in the order of a few uF) and musn't have any DC component across it. Mark.
From: langwadt on 21 Jul 2010 11:00
On 21 Jul., 13:48, "markp" <map.nos...(a)f2s.com> wrote: > Hi All, > > I need to drive capacitor with a triangle wave with no DC across the > capacitor (i.e. a symmetrical bipolar drive but triangular) but it has to be > efficient, i.e some kind of energy retrieval. > > Is it possible to use standard H bridge circuits to do this? Does anyone > have any links or app notes? > > Thanks! > Mark. what kind of frequencies, voltages? class-d audio amplifier? -Lasse |