SCM2000MKF datasheet(28/44 Pages) SANKEN

28 / 44 page

SCM2000MKF Series

SCM2000MKF-DSE Rev.1.0

SANKEN ELECTRIC CO., LTD

Nov. 12, 2018

https://www.sanken-ele.co.jp/en

Figure 14-1.

Linear Approximate Equation of VCE(SAT)

vs. IC Curve

14.2. IGBT Switching Loss, PSW

Switching loss in an IGBT, PSW, can be calculated by

Equation (4), letting IM be the effective current value of

the motor:

PSW=√2π×fC×αE×IM×VDC300.

(4)

Where:

fC is the PWM carrier frequency (Hz),

VDC is the main power supply voltage (V), i.e., the

VBB pin input voltage, and

E is the slope of the switching loss curve (see Section

15.3.2).

14.3. Estimating Junction Temperature of

IGBT

The junction temperature of an IGBT, Tj, can be

estimated with Equation (5):

Tj=R(j−C)Q×(PON+PSW)+TC.

(5)

Where:

R(j-c)Q is the junction-to-case thermal resistance per

IGBT (°C/W), and

TC is the case temperature (°C), measured at the point

defined in Figure 3-1.

y = 0.108x + 0.831

y = 0.036x + 1.359

0.0

0.5

1.0

1.5

2.0

2.5

C (A)

VCC = 15 V

°C

125

°C

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