AN2383 datasheet(18/39 Pages) STMICROELECTRONICS

Part #	AN2383

Description	A single plate induction cooker with the ST7FLITE09Y0

PDF	39 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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18 / 39 page

Measurements at 50 Hz

AN2383

18/39

Doc ID 12433 Rev 3

5.4

Working level 1

Figure 10.

System working at level 1

As soon as the pot is detected, the system moves to level 1, the lowest power working level.

The PWM signal applied changes accordingly. The lower the working level, the higher the

PWM frequency applied to the half-bridge driver, and vice-versa.

I-CTRL signal is an image of the current flowing through the plate and is sent to the MCU by

the current transformer placed in series with the plate.

With the system working properly, there must be a certain current flowing through the plate,

as the I-CTRL waveform shows in Figure 10. Even if we are talking about current, the

waveform unit is expressed in volts and processed by the MCU as a voltage level.

The waveform shown in Figure 10 was taken while a 22 cm-diameter iron pot filled with

water was placed on the plate.

MAINS

VLINK

ZVS

I - CTRL

AN2383 Datasheet(PDF) 18 Page - STMicroelectronics