5- Power Electronics – Dual Converters

Power Electronics – Dual Converters

Twin converters are primarily present in variable pace drives VFDsVFDs. In a twin converter, two converters are linked collectively again to again. The operation of a twin converter is defined utilizing the diagram beneath. It’s assumed that −

• A twin converter is a perfect one givespureDCoutputgivespureDCoutput at its terminals.
• Every two-quadrant converter is a managed DC supply in sequence with a diode.
• Diodes D1 and D2 present the unidirectional movement of the present.

Contemplating a twin converter working without circulating present, the AC present is barred from flowing by managed firing pulses. This ensures that the converter carrying the load present conducts whereas the opposite converter is blocked. Because of this, a reactor between the converters isn’t wanted.

Battery Charger

A battery charger also called a recharger makes use of the electrical present to retail vitality in a secondary cell. The charging course is set by the kind and measurement of the battery. Several types of batteries have completely different tolerance ranges to overcharging. The recharging course could also be achieved by connecting it to a relentless voltage or fixed present supply.

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Charging Price CC

The charging charge is outlined as the speed of charging or discharging a battery and is the same as the battery capacity in a single hour.

A battery charger is specified by way of its charging charge C. For instance, a battery charger with a ranking of C/10 would give a charging capability in 10 hours whereas one rated 3C would cost a battery in 20 minutes.

Kinds of Battery Chargers

There are numerous sorts of battery chargers. In this tutorial, we’ll take into account the 5 essential sorts.

• Easy chargers − Operates by supplying a relentless DC energy supply into the battery being charged.
• Quick chargers − Makes use of management circuitry to charge the battery quickly and within the course of forestalling the battery cells from harm.
• Inductive chargers − Makes use of electromagnetic induction to cost the battery.
• Clever chargers − Used to cost a battery that accommodates a chip that communicates with the good charger.
• Movement powered charger − Makes use of human movement to cost a battery. A magnet positioned between two springs is moved up and down by human movement thus charging the battery.

A separately excited DC motor has the following parameters: 220V, 100A, and 1450 rpm. Its armature has a resistance of 0.1 Ω. In addition, it is supplied from a 3 phase fully controlled converter connected to a 3-phase AC source with a frequency of 50 Hz and inductive reactance of 0.5 Ω and 50Hz. At α = 0, the motor operation is at rated torque and speed. Assume the motor brakes re-generatively using the reverse direction at its rated speed. Calculate the maximum current under which commutation is not affected.

Solution −

We know that,

Substituting the values, we get,

220=32π−−√×VL−3π×0.5×100220=32π×VL−3π×0.5×100

Therefore,

VL=198VVL=198V

Voltage at rated speed = 220−(100×0.1)=210V220−(100×0.1)=210V

At the rated speed, the regenerative braking in the reverse direction,

=32π−−√×198cosα−(3π×0.5+0.1)×Idb=−210V=32π×198cos⁡α−(3π×0.5+0.1)×Idb=−210V

But cosα−cos(μ+α)=2√198×0.5Idbcos⁡α−cos⁡(μ+α)=2198×0.5Idb

For commutation to fail, the following limiting condition should be satisfied.

μ+α≈180∘μ+α≈180∘

Therefore, cosα=Idb1982√−1cos⁡α=Idb1982−1

Also,

3πIdb−32√π×198−(3π×0.5+0.1)Idb=−2103πIdb−32π×198−(3π×0.5+0.1)Idb=−210

This gives, 0.3771Idb=57.40.3771Idb=57.4

Therefore, Idb=152.2A

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