A system development method by Jackson M.A

By Jackson M.A

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This requires that ia = (i2 + i3). i3 +48 volts i2 +15 volts i 1(t) + – Stage 1 + ou v Zg1 ib Z g2 new ground connection ECEN 5797 Power Electronics 1 Stage 3 – 2 – Stage 2 + v in t1 + – i2 + i 3 v in2 = v out 1 – Zg1 i b ia 34 Department of Electrical and Computer Engineering University of Colorado at Boulder i3 +48 volts i2 +15 volts i 1(t) + – Stage 1 2 ou v ib v in Zg1 1:1 – Stage 2 + + t1 + – ib Stage 3 – i2 + i 3 Zg2 ia = i2 + i 3 The common-mode choke forces the high frequency return current (i2 + i3) to flow through the alternate ground path: ia = (i2 + i3).

I CM 31 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of a common-mode choke to reduce the magnitude of currents in transformer interwinding capacitances iCM LM 1:1 Vg iDM D1 + – iCM Q1 – V + iCM + vsg (t) – iCM Common-mode choke inserts inductance LM to oppose flow of highfrequency common-mode currents ECEN 5797 Power Electronics 1 32 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of common-mode chokes to filter the power supply input and output CCMF + – D1 1:1 Vg 1:1 CCMF – V + CCMF CCMF The common-mode chokes, along with the capacitors CCMF, form two-pole low pass filters which oppose the flow of high-frequency common-mode currents ECEN 5797 Power Electronics 1 33 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of a common-mode choke to prevent corruption of ground reference voltage Back to example of slide #14: Attempt to prevent coupling of signal (i2 + i3) into input signal vin2 by adding another ground connection, for conduction of return current (i2 + i3).

I CM 31 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of a common-mode choke to reduce the magnitude of currents in transformer interwinding capacitances iCM LM 1:1 Vg iDM D1 + – iCM Q1 – V + iCM + vsg (t) – iCM Common-mode choke inserts inductance LM to oppose flow of highfrequency common-mode currents ECEN 5797 Power Electronics 1 32 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of common-mode chokes to filter the power supply input and output CCMF + – D1 1:1 Vg 1:1 CCMF – V + CCMF CCMF The common-mode chokes, along with the capacitors CCMF, form two-pole low pass filters which oppose the flow of high-frequency common-mode currents ECEN 5797 Power Electronics 1 33 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of a common-mode choke to prevent corruption of ground reference voltage Back to example of slide #14: Attempt to prevent coupling of signal (i2 + i3) into input signal vin2 by adding another ground connection, for conduction of return current (i2 + i3).

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