AN2383 datasheet(25/39 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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25 / 39 page

AN2383

Alarm management

Doc ID 12433 Rev 3

25/39

Alarm management

The alarm circuitry is necessary for monitoring any possible malfunctions, and to prevent the

IGBTs, the driver, or any other circuitry from burning or being damaged.

The application described here features 4 different alarms: overtemperature on the heatsink

(H), overtemperature on the plate (t), overcurrent (C) and wrong pot on the plate (P).

An alarm is generated when the heatsink temperature exceeds 115 °C, or when the plate

reaches a temperature of 200 °C.

If for any reason the current flowing through the plate goes over the limit, an alarm occurs.

Similarly, while in the power-on sequence, if a non-magnetically conducting material is

placed on the plate, an alarm occurs. In alarm condition, the PWM frequency is immediately

set to 30 kHz, and then smoothly increased to 50 kHz. The system is put in standby mode

and the display shows which alarm occurred (refer to the letters in brackets).

AN2383 Datasheet(PDF) 25 Page - STMicroelectronics