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STCC08 Arkusz danych(PDF) 6 Page - STMicroelectronics |
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STCC08 Arkusz danych(HTML) 6 Page - STMicroelectronics |
6 / 13 page Functional description STCC08 6/13 Failure mode detection This function detects AC switch failure modes required by the IEC 60335 standard: ● The AC switch diode mode failure in both negative and positive AC line polarities This failure is simulated with a diode placed in parallel with the power switch according to the IEC 60335-1 standard. ● The AC switch short-circuit failure mode, any external shorting and any spurious power switch turn-on ● The open AC switch failure mode This function improves the system safety. A diode mode failure, a short circuit or an AC switch open can lead to dangerous situations for the system or the user. The AVF block monitors the state of the AC switch in both AC polarities. Its output AVF is transmitted to the MCU for failure detection. The MCU detects the failure according to the following truth table: For a diode mode, the AVF output toggles from open collector to GND each the half of the AC mains. Therefore, the AVF output is a pulsed signal during a diode mode failure. The MCU can put the system in a safe configuration, switching off the front end relay already existing in home appliance designs. Status reading The AVF output is an open collector, active at low level. It can either be connected to a MCU input, in pull up input configuration, or through an opto-coupler in insulated designs. For inductive loads, there is a phase shift between load current and AC line voltage. When the ACS control is removed: ● The AC switch - latch structure - still conducts and the AVF is at low level until the next zero current crossing. ● The AVF is at low level until next zero current crossing. ● In the worst case, the load current crosses zero close to peak mains voltage. Then the AVF signal should be read at peak mains voltage. Table 8. STCC08 status truth table with RSHUNT in parallel with the load IN (MCU generated) AVF MCU DIAGNOSTIC 0 Open collector AC switch OK 0 Open collector to 0 toggle Diode mode 0 0 Short AC switch 10 AC switch OK 1 Open collector Open AC switch |
Podobny numer części - STCC08 |
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Podobny opis - STCC08 |
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