AEG ST 500 Service Manual download pdf (Page 18)

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Technology

The transformation of the 12 V DC into 230 V AC,

follows in two stages.

Stage 1:

The device increases the incoming DC voltage to

300 V.

Stage 2:

This voltage is then converted into alternating

current with a voltage of 230 V and a frequency

of 50 Hz per second.

For this process a kind of transistor is used,

which consists of a highly integrated chip

named MOSFET (metal oxide semiconductor

ﬁeld-effect transistor).

Output voltage, wave shape ST devices:

The output voltage in this device is reproduced

as a modiﬁed sine wave. This has a gradated form,

which shows nearly exactly the same character-

istics like a pure sine wave. This modiﬁed sine

wave is recognized by most modern external

devices with a voltage of 230 V. Power supply

systems in electronic components belong to it,

transformers and / or small motors. The modiﬁed

sine wave produced by this voltage inverter uses

an effective voltage of 230 V. Most digital and

similar voltmeters cannot read the effective

voltage and show a value, which is around 20 to

30 V below the actual value of the output voltage.

In order to obtain an exact measurement result,

please use a measuring instrument suitable for

the measurement of the effective voltage.

Output voltage, wave shape SW devices:

The output voltage of the voltage converter SW

is reproduced as a pure sine wave and the out-

put voltage reaches the same quality like your

home socket.

This pure sine wave is suitable for all sensitive

appliances which require a pure sine wave. These

include appliances which have internal electronic

controls, like for example coffee pad machines,

automated coffee machines or electrical razors.

In television, stripes can occur in the picture

with the modiﬁed sine wave, with a pure sine

converter you can get an absolute stripe free.

WARNING!

Some external devices, particularly radios and / or

other audio and rechargeable appliances can

damage the voltage inverter and / or the attached

appliances.

Examine whether the external equipment attached

to the voltage converter “hums”, warms up

strongly or heats up excessively during the ﬁrst

few minutes. In this case separate the external

devices and all cables immediately.

This means in fact that the devices are not com-

patible and cannot be used together. Should

something be unclear you, refer to the specialist

dealers of your external device.

This problem does not arise with modern and / or

high-quality devices, since these are able to

recognise and process modiﬁed sine waves.

Soft starting technology.

The voltage inverter is equipped with soft start-

ing technology, which contributes to the fact

that the voltage conversion takes place in stag-

es. In this way appliances can be used, which

need a higher starter current. By increase of

the output voltage in stages, a damage of the

voltage converter, the 12-V-input socket and

the attached appliances is prevented.

Security

General safety guidelines

WARNING!

Read all safety guidelines and

instructions. Omissions regarding the compliance

to safety guidelines and instructions can cause

electrical shock, ﬁre and / or serious injuries.

Keep all safety guidelines and instructions for

future reference.

DANGER OF ACCIDENT AND LIFE

FOR INFANTS AND CHILDREN!

Never leave children unsupervised

Introduction / Security

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