Application of oscilloscope probe in switch loss test scheme

Today's switching power supply technology largely relies on power semiconductor switching devices , Such as MOSFET and IGBT. These devices provide fast switching speeds , Able to withstand irregular voltage peaks . At the same time On or Off The power of the trumpet is very small , High conversion efficiency is achieved , Very low heat loss .

Switchgear largely determines SMPS Overall performance of . The loss of switching devices is the most important loss point in switching power supply , Switching loss test is very important in courseware . This article only introduces the probe application in the switching loss test scheme .

Use MSO5 coordination THDP0200 And TCP0030A Isoprobe .

In the above scheme, special switch loss algorithm of oscilloscope is used , Cooperate with Tektronix probe , Perfect compensation for probe delay , The error in switching loss calculation is reduced . The test results are extremely reliable .

TCP0030A And THDP0200 Parameters ：

Appearance drawing of probe

TCP0030A

THDP0200

attach ： Introduction to common parameters

1、 bandwidth , Represents the maximum signal frequency that can be measured by the probe

2、 Common mode rejection ratio , It represents the ability of the probe to suppress common mode interference , The larger the size, the stronger the inhibition

3、 Input capacitance , Represents the load effect of the probe on the system under test , The lower the input capacitance , The smaller the impact, the better the test effect .