how can I light a 100 watt lamp with simple circuit? - Page 1
Forum section: electronics / beginners

author: mirsaeed
author_rank: Newbie
timestamp: October 28, 2016, 04:27:29 am
content: hello all.I tried to design a circuit that I can convert 1.5 to 220 ac to light up a 100 watt lamp.but I faced with many problem.there are many sample but no one said chrachter of poly ster capacitor?transistor and tiny transformer?could you help me?pleasemiralisaeed@gmail.comthanks for good helps

author: NottheDan
author_rank: Frequent Contributor
timestamp: October 28, 2016, 04:42:02 am
content: 100 Watts? Wouldn't that draw in excess of 60A on the 1.5V side?

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: October 28, 2016, 04:42:53 am
content: Can you show what circuit idea you have so far?What are you using for a 1.5V source of power?100 Watts is a lot of power for any 1.5V source I know. You realize that if a load takes 100Watts then the source must supply that much plus some more lost in the voltage conversion?

author: Skimask
author_rank: Super Contributor
timestamp: October 28, 2016, 04:44:08 am
content: Did anybody else google that email address?

author: NottheDan
author_rank: Frequent Contributor
timestamp: October 28, 2016, 05:29:55 am
content: Quote from: Skimask on October 28, 2016, 04:44:08 amNow I did.And now I have the urge to listen to West End Girls.

author: jonovid
author_rank: Super Contributor
timestamp: October 28, 2016, 05:44:27 am
content: QuoteI seen that happen on stage then he then went on to pull a rabbit out of a hat.magic is an art. and a magician never reveals his secrets.

author: Psi
author_rank: Super Contributor
timestamp: October 28, 2016, 07:48:30 am
content: It's totally doable. Just going to be terribly inefficient.Maybe 20%?And its going to need a big ass heatsink to handle all that wasted power

author: Brumby
author_rank: Unknown
timestamp: October 28, 2016, 07:54:20 am
content: I'll reserve comment until I know what the 1.5V source is going to be....

author: DimitriP
author_rank: Super Contributor
timestamp: October 28, 2016, 08:12:35 am
content: Quote from: Brumby on October 28, 2016, 07:54:20 amHere you go:

author: DimitriP
author_rank: Super Contributor
timestamp: October 28, 2016, 08:28:49 am
content: Quote from: Brumby on October 28, 2016, 07:54:20 amSo many possibilities....

author: obiwanjacobi
author_rank: Super Contributor
timestamp: October 28, 2016, 10:39:51 am
content: I would design a circuit that uses normal mains to light the 100W lamp and switch it with a Triac using the 1.5V to drive the gate...

author: Psi
author_rank: Super Contributor
timestamp: October 28, 2016, 10:49:29 am
content: Quote from: obiwanjacobi on October 28, 2016, 10:39:51 amThat's way to sensible, i want to see an array of 100 AA batteries in parallel driving this thing

author: DimitriP
author_rank: Super Contributor
timestamp: October 28, 2016, 11:04:52 am
content: Quote from: obiwanjacobi on October 28, 2016, 10:39:51 amHere is a start:http://www.instructables.com/id/Small-Triac-Switch/

author: Ian.M
author_rank: Super Contributor
timestamp: October 28, 2016, 11:22:05 am
content: Quote from: Psi on October 28, 2016, 10:49:29 amNo. Far too complex. Just put app0rox 150 in series and light the bulb directly.The worrying thing is: I immediately had a vision of a stack of groups of seven batteries packed in a plastic tube with a round double sided PCB with alignment pins between each group and as end plates so each group of seven cells is in series. Should be a nice 1.2m stack in a length of class 200 2" rigid PVC pipe. Its not quite as dangerous as theEEVBLOG BOFH cattleprodbut should still be treated with respect.On the saner side of things, 1.5V latching mains rated relays are readily available. They are commonly used in time-switches powered by a single AA battery.

author: danadak
author_rank: Super Contributor
timestamp: October 28, 2016, 03:49:53 pm
content: Something like this, fully isolated so control side not a shock hazard.Control V to switch on and off simple dc, can use with UP like Arduino,or a solar cell or simple 2 cell battery and a switch.http://www.ebay.com/itm/Crydom-Photo-Isolated-Solid-State-Relay-D1225-/112061716586?hash=item1a1766186a:g:2m8AAOSwqfNXjm7YRegards, Dana.

author: IanB
author_rank: Super Contributor
timestamp: October 28, 2016, 04:47:28 pm
content: It's instructive to look at the history of cellphone boost chargers that tried to produce a 5 V 1 A output from a 1.5 V battery. The only one that was even half way successful used an Energizer Lithium battery rather than a simple alkaline cell. The others all resorted to using two AA cells rather than one. Since none of these solutions were really effective all the later power banks use a rechargeable lithium ion cell instead.Therefore, we can say that if it is not feasible to boost 1.5 V to 5 V at 5 W, it will be beyond impossible to boost 1.5 V to 120 V at 100 W.

author: Ian.M
author_rank: Super Contributor
timestamp: October 28, 2016, 05:03:23 pm
content: That depends - with enough capacitance on the HV bus, and enough time to charge it, it could light the bulb briefly once. A new Alkaline AA holds about 5KJ of energy, Assuming 50% losses, it should be possible to transfer about 2.5KJ into a 87000uF 250V capacitor bank, charged to 240V, which should light the bulb adequately for about 10 seconds before the voltage drops too low.Caution: the circuit would not only bite, if anything goes wrong it could do you enough damage to make a closed coffin funeral advisable.Edit: cant do basic maths. Now fixed

author: Zero999
author_rank: Super Contributor
timestamp: October 28, 2016, 06:28:06 pm
content: Presumably you're talking about an incandescent lamp? If so it's a bad idea. Go for LEDs, they will give the same amount of light with only 15W.

author: P90
author_rank: Frequent Contributor
timestamp: October 29, 2016, 10:51:45 am
content: But, where's the fun in that?

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: October 29, 2016, 08:45:09 pm
content: How about a supercapacitor? That should give you the current, if you have the rest of the circuit to give whatever voltage the bulb needs.