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IRPT5051D Datasheet(PDF) 3 Page - International Rectifier |
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IRPT5051D Datasheet(HTML) 3 Page - International Rectifier |
3 / 12 page IRPT5051 page 3 gate, deactivating the gate drive circuits and shutting off the in- verter. The relay control circuit delivers an on/off signal via an opto-isolator to the relay driver which controls the relay (K1). The relay contact is open during power-up, inserting the resistor R in series with the DC bus capacitor and limiting the capacitor charging current. In normal operation, the relay contact is closed. If the AC line voltage falls below 300V or if one input phase is lost, or if the DC line voltage falls to less than 82% of the peak line voltage, the relay contact opens. The UV circuit senses the voltage of the local power supply, and sends a signal via an opto-isolator to the latch in the event of undervoltage. The UV circuit normally activates the latch only during power-up and power-down, preventing the IGBTs from Figure 3. IRPT5051D Driver-Plus Board being turned on when the local power supply voltage is too low for proper IGBT switching. The current signal processing circuit receives inputs from current transformers connected in series with the input lines and the DC bus capacitor. The output of the current signal processing circuit, IFB, is essentially an isolated replica of the inverter input current. An isolated current feedback signal, IFB, is provided as an output of the IRPT5051A. If the inverter current exceeds the trip level of 65A, IFB also activates the latch. The thermistor activates the latch if the temperature of the IMS substrate exceeds a set level. The 15V isolated power supply used to power the IRPT5051 should be the same as the one for the PWM gnereation, otherwise the protection functions will be disabled. |
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Similar Description - IRPT5051D |
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