AN2383 datasheet(17/39 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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17 / 39 page

AN2383

Measurements at 50 Hz

Doc ID 12433 Rev 3

17/39

5.3

Powering the plate (with pot)

Figure 9.

Plate power-on (with pot on the plate)

The DC link voltage is applied to the plate and the PWM signal is applied to the half-bridge

driver for half a second. Due to the resonant tank consumption, a voltage drop appears on

the VLINK signal. The voltage drop is read by the MCU to detect if a pot is present on the

plate.

In this case, the pot is on the plate and the voltage drop is high enough to exceed the pot

detection threshold (PDT), set by software at 500 mV. A certain current is now flowing

through the plate.

The pot is detected, so the system can move to the first working level: level 1.

The waveform shown in Figure 9 was taken while a 22 cm-diameter iron pot filled with water

was placed on the plate.

MAINS

VLINK

ZVS

I - CTRL

PDT

AN2383 Datasheet(PDF) 17 Page - STMicroelectronics