About the article

Simple 12-to-230V Power Inverter

A mobile power outlet

Simple 12-to-230V Power Inverter
The absence of a mains power outlet is often keenly felt on camping sites, with car repairs in the middle of nowhere and with picnic or party events in the countryside. In some cases, mains power can only be brought to a remote site by running a very long cable — which either dangerous, impossible or not available. Whatever the occasion, planned or unexpected, it is great to have a power inverter available capable of changing the 12-V car battery voltage into 230 volts AC.The idea for a simple, portable ‘power outlet’ was first suggested by a trainee at the Aixcom company, which is normally involved with high-tech power inverters and special high-current power supplies. The trainee, called Dirk, had been trying for quite some time to build a power inverter for his model aircraft club. In his enthusiastic attempts he ran into problems obtaining the special integrated circuit that was to form the heart of his project. When he was finally successful in obtaining the elusive chip, albeit at horrific costs, all the circuit did was produce a loud bang at switch-on, wrecking a lot of components.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1 = 15kOhm
R2 = 22kOhm
R3 = 2kOhm 7
R4 = 10kOhm
R5 = 12kOhm
R6 = 4kOhm 7
R7 = 47kOhm
R8 = 0Ohm 01 (max. lead pitch 24mm)
R9 = 1kOhm (PTC, see text)
R10 = 8Ohm 2
R11 = 16kOhm 9
R12 = 33Ohm
R13,R15 = 22Ohm
R14 = 18Ohm
R16 = 1kOhm
R17 = 470Ohm
C1,C2 = 220µF 16V radial
C3,C7,C9,C10 = 220nF
C4 = 1µF 63V radial
C5,C6 = 33nF
C8 = 2µF2 63V, 15mm lead pitch, MKS4 (Wima)
D1 = LED, red, low current
D2 = 1N4148
D3 = 1N4002
D4 = 18V 1.3W zener diode
D5,D6 = BYV27-200
IC1 = LM393N
IC2 = SG3526N
T1,T2 = IRFP054N (IRF)
X1-X6 = AMP spade terminals, PCB mount
PCB, order code 020435-1
Toroidal mains transformer, see text, e.g., Aixcon 230V /12-0-12 V / 200W (www.geist-electronic.de)
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