__TEST #11 : Test of the
flat bifilar coil v1.1 with a new induction cooker__

*created on december 28, 2012 - ***JLN
Labs*** - last update january 15, 2013
*All informations and
diagrams are published

Toutes les informations et schémas sont publiés gratuitement ( freeware ) et sont destinés à un usage personnel et non commercial

Cliquez ici pour la version FRANCAISE

__January 14, 2013__
- __TEST #11 __: Here is a test of the coil
v1.1 with a new induction cooker manufactured by "Rosenstein
& Söhne" and with the reference NC-3050. This model of
induction cooker is sold for less than 40€ and it is able to
give a max power of 1800 Watts and an average power of 1200 W in
10 programmable steps.

Below some photos of the inside of this induction cooker :

The coil of the induction cooker is made with Litz wire, but the wiring setup is a bit different from the previous tested version.

The induction coil is made with spaced turns on two interleaved layers...

Below the electronic control board which drives the induction coil.

To measure the
voltage and the current at the output for powering the halogen
lamps, the two scope probes are set to X10 and are connected to
the flat bifilar coil output. The probe Ch1 is used to measure
the voltage accross the flat bifilar coil output and the probe
Ch2 is used to measure the current i.e. the voltage accross a 0.1
Ohm __non inductive resistor__ Mundorf MR10 10W. Then the
datas are sent to a datasheet to compute true RMS values and the
efficiency. The electrical power input of the induction cooker is
measured with a Wattmeter Energy Logger 4000F directly connected
on the power grid.

In this test, I have used the same setup of halogens lamps as for the TEST#5, there are :

- 1 box of 6 halogenes lamps of 105 W
- 2 sets of
halogen which contains :
- 1 set of halogens tubes : ((2 x 240 W) + (1 x 400 W)) + (2 x 500 W)
- 1 set of halogens tubes : (1 x 240 W) + (2 x 400 W)

The

**TOTAL POWER**connected at the**OUTPUT**of the GEGENE is**3550 Watts**

Here the configuration of the TEST #11:

__TEST
#11 RESULTS__ :

The True RMS values of the voltages on the Ch1 and Ch2 are computed in real time by the Rigol digital oscilloscope ...

Here is an attempt of a mathematical calculation with the Piecewise Cubic Hermite Interpolating Polynomial (PCHIP) method of the digital datas from the oscilloscope, we found :

- U rms integrated on all the datas in Volt (V) with PCHIP:

Trapeze method : 101.822 Volts RMS

Simpson method : 101.544 Volts RMS- I rms integrated on all the datas in Ampere (A) with PCHIP:

Trapeze method : 10.702 Amperes RMS

Simpson method : 10.671 Amperes RMS- Average Power integrated on all the datas in Watts (W) with PCHIP:

Trapeze method : 844.482 Watts

Simpson method : 839.802 Watts

Thanks to Pascuser for his interesting work about this mathematical calculation using the PCHIP method for the computation of the digital datas flow coming from the oscilloscope.

The electrical power for the induction cooker is measured with a Wattmeter Energy Logger 4000F directly connected on the power grid :

The Wattmeter measures 1163 Watt at the INPUT of the induction
cooker.

Above the True RMS voltage measured by the Rigol digital
oscilloscope.

The
True RMS voltage measured accross the flat bifilar coil with the
probe Ch1 is 128 V rms.

The True RMS voltage measured accross non inductive (metal)
resistor of 0.09 Ohm with the probe Ch2 is 1.21 V rms, which
gives a measured current of 13.4 A rms.

__Comments__ : We can observe that the
mathematical PCIHP method to compute the datas flow gives very
different and lower voltages values compared to the True RMS
voltages measured in real time by the digital oscillocope. We can
also notice that, if we calculate the True RMS values with a
datasheet (point to point method) after downloading the datas
from the oscilloscope, the RMS values calculated with this method
are very close to the the True RMS values calculated in real time
with the Rigol digital oscilloscope. Below the results :

True RMS Voltage (Rigol oscilloscope) = 128 V rms, computed RMS
voltage (datasheet) = 126.7 V rms,

True RMS Current (Rigol oscilloscope) = 13.4 A rms, computed RMS
current (datasheet) = 13.3 A rms

Below, the scope datas computed with GNU Octave 3.2.4 (freeware and full compatible version of MATLAB)

With this induction cooker model, I don't need to use a
ferromagnetic sheet to start the ignition of the halogen lamps.

NEXT TEST :

Stay tuned,

Email: jnaudin509@aol.com