Solid state Bedini charger from John Peters

[crowclaw]

Hi Crowclaw, tx for the reply. I'm keen to try your circuit. As a newbie it's a variation of Daftmans circuit (on energetix) which I've been playing with. Do you have any pics of your working setup? My end goal is to help a poor rural community pulse charge their battery banks using lower power (therefore cost) PV panels. I will need to parallel up those high-side switches! Any advice would be appreciated. Tx for sharing your knowledge as you do!

Hi heathzap, most of my experimental projects tend to be tested and then dismantled as the project progresses, however I have been using a four parallel version of my BSP452 I posted previously. For this design I use four  identical 22R small air cored inductors each connected to it's own BSP452 and each having a diode output. The anodes are all common ed up and each BSP452 inputs  are also common connected to the 555 timer IC's output. This circuit then provides four times the BEMF into the charge cell. The BSP's inputs are high impedance so provide negligible loading from the timers output, and each output is also matched and summed when presented to the charging cell. If you haven't already done so put together a 555 timer with both frequency and mark space ratio control Potts. The timer circuit then gives you maximum flexability in controlling the best charging method for the type of cell in use. I will post a pic of this set up as soon as I can.

[heathzap]

Hi Crowclaw, thanks for the added info. I'll be trying this config during the next couple of weeks and hope to post some results. Thanks once again for sharing your expertise!

[heathzap]

@Crowclaw: Further to my last, I have access to the ITS4140 high-side switch. Here is the link: http://www.infineon.com/dgdl/ITS4140N_DS_Rev21.pdf?folderId=db3a304412b407950112b408e8c90004&fileId=db3a304412b407950112b4298dc34130

Seems that it should do the business but any thoughts would be appreciated.

Regards

[crowclaw]

@Crowclaw: Further to my last, I have access to the ITS4140 high-side switch. Here is the link: http://www.infineon.com/dgdl/ITS4140N_DS_Rev21.pdf?folderId=db3a304412b407950112b408e8c90004&fileId=db3a304412b407950112b4298dc34130

Seems that it should do the business but any thoughts would be appreciated.

Regards

Hi heathzap, Yes worth a try... these devices adapt easily. Make sure your drive signal switches at or very near ground, a general purpose signal type mosfet would be ideal at the input to achieve this purpose. These devices draw very little gate current and are high impedance of course so can be paralleld up if needed. One last point... depending on power dissipation include a heatsink. I've used short lengths of copper water pipe with a flattened tab formed out of one end and soldered to the tab. You can use plastic type pipe fittings to secure the pipe to the project chassis, remember the tab is electrically connected. Have fun

[heathzap]

@Crowclaw: as always, thanks for the advice!