{"id":8763,"date":"2013-11-05T07:35:23","date_gmt":"2013-11-05T15:35:23","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=8763"},"modified":"2013-11-05T18:43:09","modified_gmt":"2013-11-06T02:43:09","slug":"2013-11-05-blog-uses-joule-thief-as-battery-charger","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=8763","title":{"rendered":"2013-11-05 Blog Uses Joule Thief As Battery Charger"},"content":{"rendered":"

I got a Google Alert that pointed to a facebook page for a Joule Thief.\u00a0 In that page I found a link to this UK blog<\/strong><\/a> about using a Joule Thief as a battery charger (click on the link to the .PDF schematic).<\/p>\n

The Joule Thief circuit is a typical example of a conventional JT.\u00a0 Instead of a 1k resistor, the author uses a 50k pot.\u00a0 He should also include a 1k resistor in series with the pot, so if he turns it to minimum it will prevent the transistor’s base current from becoming excessive and damaging the transistor.<\/p>\n

The author winds a separate winding on the toroid core and connects this to the AC inputs of a full wave bridge rectifier (FWB).\u00a0 Then the rectified DC goes directly to a LED light (and also through a 10 ohm resistor).\u00a0 One characteristic of a full wave bridge is that it has two diodes in series with the current, so each time it rectifies there is 0.6 to 1 volt drop for each diode, or 1.2 to 2 volts drop total.\u00a0 The power wasted in the FWB is more than the power that is going to charge the battery.\u00a0 Combine this with the approximately 50 percent losses in the Joule Thief itself, and the charging battery gets less than 25 percent of the power that is drawn from the “run” battery.\u00a0 This is very wasteful.<\/p>\n

Most people don’t remember that the LED is a light emitting DIODE.\u00a0 This means that it will also rectify the AC into DC, so actually the FWB is not needed at all.\u00a0 The only thing that one has to do is try connecting the winding to the LED first one way, then the other way (swap the wire ends).\u00a0 The pulses from the winding are not symmetrical and will light the LEDs brighter one way than the other.\u00a0 Leave the leads connected whichever way the LEDs are the brightest.<\/p>\n

The idea of using the Joule Thief or a similar circuit called a Bedini SSG came from those experimenter who were trying to ‘harvest energy’ and make a circuit that has a a COP (coefficient of performance) of greater than unity.\u00a0 More can be read about this at overunity.com<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

I got a Google Alert that pointed to a facebook page for a Joule Thief.\u00a0 In that page I found a link to this UK blog about using a Joule Thief as a battery charger (click on the link to the .PDF schematic). The Joule Thief circuit is a typical example of a conventional JT.\u00a0 <\/p>\n

(Read More…)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[141,4],"tags":[],"class_list":["post-8763","post","type-post","status-publish","format-standard","hentry","category-free-energy","category-joule-thief-smps-dc-dc"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/8763","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8763"}],"version-history":[{"count":10,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/8763\/revisions"}],"predecessor-version":[{"id":8777,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/8763\/revisions\/8777"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8763"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8763"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8763"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}