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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2383 датащи(PDF) 25 Page - STMicroelectronics |
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AN2383 датащи(HTML) 25 Page - STMicroelectronics |
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25 / 39 page  AN2383 Alarm management Doc ID 12433 Rev 3 25/39 7 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). |
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