Switching Loss Measurements - Wolfspeed SPEEDVAL KIT HALF-BRIDGE MOD-MB-HB-0900V-40A User Manual

B. Switching Loss Measurements
Once the circuit has been deskewed, remove the deskew resistor and replace with the air core
inductor.
Switching Energy Measurement Setup
 Ensure the power daughter card has been configured per the user guide to use a high-
resolution current shunt or two-stage CT in order to get accurate results.
 It is recommended to use the SpeedVal Kit air core inductor that has been optimized to have
low parallel capacitance.
 Select an inductance value to achieve the desired switching current using a pulse width of
15us or less to avoid self-heating the part.
 The fan does not need to run for this test.
Select A Control Option
1. External Function Generator
 Connect function generator to "LS IN" BNC connector
 Set the two 3-pin jumpers near the BNC connectors to the "BNC" setting
2. Control Card
 Plug a control card into the control card slot. Ensure firmware has been loaded per
instructions in user guide.
 Connect control card to PC to operate the program
 Set the two 3-pin jumpers near the BNC connectors to the "CTRLR" setting
Switching Energy Measurement Procedure
Figure 34 shows the connection diagram for taking double pulse measurements.
F 36: S
IGURE PEED
PRD-06829 REV. 1, December 2022
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sponsorship or association.
V K ™ C
AL IT ONNECTIONS FOR
SpeedVal Kit™ Half-Bridge User Guide
T S E
AKING WITCHING NERGY
M
EASUREMENTS
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