Qrr Test equipment of a reverse recovery charge in the power

thyristors and power diodes

Tester specifications

Type T.QRR.4000

supply voltage 3x400VAC;

50/60Hz

phase current consumption 12A max

short time power consumption 3kVA

temperature operating 15ºC - 40ºC

relative humidity (operating) 10% - 90%

dimensions (LxWxH)

1177x1365x2470

weight 300kg

Parameters of a test current

waveform shape trapezoid

current rise (front of a waveform) ap. 5-14A/μs

set up current back 100-4000A

set up current pulse duration 100-1000μs

set up current fall rate di/dt (voltage and a coil tap) 5-200A/μs

linearity di/dt better then 10%

maximum value of a measured reverse current Ir 600A

maximum value of a reverse current measurement time 100μs

gate current of a tested thyristor 500mA

impulse duration 40μs

Measurements and results presentation

Reverse current waveform diagram on the monitor

Calculated value of a Qrr as an integral of waveform on the monitor in μC

Calculated value according to the definition 1 (10%) in μC

Calculated value according to the definition 2 (25%) in μC

Calculated value according to the definition 3 (50%) in μC

Measurements trr (tra+trb) in μs

Equipment tester

• The tester is equipped with a PC and monitor

Can work with another computer, an external database and barcode reader.

• Connection to the press, the ability to communicate with the press via RS-232

• Light Tower operating status tester