230v to 110v Circuit Required Please - Page 3 - Electronic Circuits Projects Diagrams Free

RODALCO · 18th August 2007, 08:16 AM

To add to this post is that the first TX is connected to L1 and L2, the second TX to L2 and L3, the third TX to L3 and L1 to keep the system balanced.

For the SWER the same applies.
The isolating TX is supplied from 2 phases. The output is 1 phase and the other terminal is earthed.

The isolating TX is used to avoid tripping the line protection on earth fault.

Hero999 · 18th August 2007, 12:08 PM

Quote:

Originally Posted by RODALCO

The system Hero999 describes is also used a lot in rural New Zealand.

From the 3 phase line a 2 phase transformer with secondairies of 2 x 230 Volts or 2 x 240 Volts is used with the windings in parallel.

With the windings in series 460 or 480 Volts can be taken off for a 1 Ø motor with an extrernal capacitor to create the phaseshift.

In the second case the neutral will be on the link between the secondairies to keep the phase to neutral; voltages below 250 Volts.

This set up is also used on the SWER systems which have only a 1 phase line fed from an isolating TX at a voltage of 6.6 or 11 kV.

I think you're missing the point. That's a split phase system, not a two phase system.

RODALCO · 18th August 2007, 10:50 PM

Correct! with the common neutral the phases are 180° apart. we refer this as a 1 Ø system for the secondary, regardless if 230 or 460 Volts is supplied.

For the primary, it is a single phase supply taken of 2 phases of the network.

Gordz · 27th October 2007, 02:58 PM

You may get away with connecting a diode in series with the charger, without knowing exactly how your charger is designed it would be all guesswork. If it is an 'international' charger it may have a doubler inside, but it is likely that an autotransformer is your answer here.

Hero999 · 27th October 2007, 03:38 PM

Never connect a diode in series with anything other than a resistive load such as a heater of incandescent lamp.

If the charger has a transformer on the input it'll go into core saturation and melt down.

If the charger uses a switch mode power supply then the higher input voltage will pop the capacitors and destroy the switching transistors.

The only way of powering anything other than a simple resistive load of a higher voltage source is to use a transformer.

audioguru · 27th October 2007, 07:13 PM

The Lithium battery charger has a 3A low voltage output. Since it is probably a single "3.6V" cell then the charger's max output voltage is 4.2V and the power is only 12.6W.

If the charger has a very poor transformer then its primary power is 25W.
A stepdown transformer that is 230V to 110V at only 25W is small.

Hero999 · 28th October 2007, 12:15 AM

Yeah, but how many 25VA 230:110V transformers have you seen?

100VA is normally the smallest size they come in.

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18th August 2007, 08:16 AM	(permalink)
RODALCO	To add to this post is that the first TX is connected to L1 and L2, the second TX to L2 and L3, the third TX to L3 and L1 to keep the system balanced. For the SWER the same applies. The isolating TX is supplied from 2 phases. The output is 1 phase and the other terminal is earthed. The isolating TX is used to avoid tripping the line protection on earth fault. __________________ There are more ways to get to Rome. Electricity, Electric clocks, Meters and Trains are great.

18th August 2007, 10:50 PM	(permalink)
RODALCO	Correct! with the common neutral the phases are 180° apart. we refer this as a 1 Ø system for the secondary, regardless if 230 or 460 Volts is supplied. For the primary, it is a single phase supply taken of 2 phases of the network. __________________ There are more ways to get to Rome. Electricity, Electric clocks, Meters and Trains are great.

27th October 2007, 02:58 PM	(permalink)
Gordz	You may get away with connecting a diode in series with the charger, without knowing exactly how your charger is designed it would be all guesswork. If it is an 'international' charger it may have a doubler inside, but it is likely that an autotransformer is your answer here.

27th October 2007, 03:38 PM	(permalink)
Hero999	Never connect a diode in series with anything other than a resistive load such as a heater of incandescent lamp. If the charger has a transformer on the input it'll go into core saturation and melt down. If the charger uses a switch mode power supply then the higher input voltage will pop the capacitors and destroy the switching transistors. The only way of powering anything other than a simple resistive load of a higher voltage source is to use a transformer. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

27th October 2007, 07:13 PM	(permalink)
audioguru	The Lithium battery charger has a 3A low voltage output. Since it is probably a single "3.6V" cell then the charger's max output voltage is 4.2V and the power is only 12.6W. If the charger has a very poor transformer then its primary power is 25W. A stepdown transformer that is 230V to 110V at only 25W is small. __________________ Uncle $crooge

28th October 2007, 12:15 AM	(permalink)
Hero999	Yeah, but how many 25VA 230:110V transformers have you seen? 100VA is normally the smallest size they come in. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.