5SHX1960L0004 3BHL000390P0104 ABB rectifier thyristor

Blocking Parameters in IGCT Datasheet:

Maximum Rated Values:

1. VDRM (Maximum Repetitive Voltage in Forward Direction):
   • VDRM is the maximum repetitive voltage in the forward direction.
   • IGCT can block this voltage at line frequencies of 50 or 60 Hz, assuming a sinusoidal waveform.
   • Exceeding VDRM may lead to increased leakage current, power loss, and potential thermal runaway.
2. VDC-link (Maximum Continuous DC Voltage):
   • VDC-link is the maximum continuous DC voltage for a specified failure rate (e.g., 100 FIT) due to cosmic radiation.
   • Exceeding VDC-link does not immediately cause device failure, but the probability of cosmic radiation failure increases progressively.
3. VRRM (Maximum Repetitive Voltage in Reverse Direction):
   • VRRM is the maximum repetitive voltage in the reverse direction.
   • For asymmetric IGCTs, VRRM is in the range of 17 V, determined by the reverse blocking capability of the gate-to-cathode junction (VGRM).
   • The datasheet distinguishes between off-state (VRRM = 17 V) and “on-state” (VRRM = 10 V).
   • “On-state” reverse voltages of up to 17 V are allowed when the device is gated “on” without feedback.
   • The term “on-state” refers to the gating status, where the device may be ordered “on” but circuit conditions may require the anti-parallel diode to conduct.

Characteristic Values:

1. IDRM (Maximum Leakage Current):
   • IDRM specifies the maximum leakage current when VDRM is applied.
   • Measured at Tvj max, with sinusoidal voltage pulses (tp = 10 ms) and an energized gate unit.

Important Considerations:

• VDRM is the quasi-static blocking capability, but it represents the maximum dynamic voltage (VDM) following turn-off.
• IGCT can only block the rated voltage if the gate unit is energized.
• VDC-link exceeding does not lead to immediate failure but increases the probability of cosmic radiation failure.
• VRRM distinguishes between off-state and “on-state,” where reverse voltages up to 17 V are allowed when gated “on.”
• IDRM measures the maximum leakage current when VDRM is applied.

Note:

• Specific calculations related to cosmic radiation failure can be found in application note 5SYA2046 “Failure rate of IGCTs due to cosmic rays.”

Understanding these parameters is essential for ensuring the proper operation and reliability of IGCTs in different applications. Subsequent sections will provide insights into additional parameters and their significance.