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Figure 7.6 The trend of the S0 , 2 S7 , and S0 + 2 S7 v.s. ωt.......................................................... 84
Figure 7.7 Sine carrier modulation method .................................................................................. 86
Figure 7.8 (a) The desired converter output current of the dc-dc converter; (b) Two references
compared with the triangle carrier for the dc-dc converter; (c) Generated switching
function of v y ; (d) Generated switching function of vx ; (e) Generate Sconv using
S x ⊕ S y ....................................................................................................................... 88
Figure 7.9 The comparison of I RMS between the regular PWM strategy and modified linear
carrier modulation method ........................................................................................... 89
Figure 7.10 The comparison of A·sec between the regular PWM strategy and modified linear
carrier modulation method ........................................................................................... 90
Figure 7.11 (a) The desired dc-dc converter output; (b) The realization approach of the carrier
modulation method: two references, instead of only one, compared with the traditional
triangle carrier; (c) Generated switching function of v y from (b);(d) Generated
switching function of vx from (b); (e) Generate Sconv by S x ⊕ S y . .......................... 94
Figure 7.12 Calculation result and simulation result of the capacitor current ripple per unit value
v.s. duty cycle under test condition .............................................................................. 97
Figure 7.13 The comparison of the capacitor current ripple per unit value between the regular
PWM strategy (dash line) and modified carrier modulation method (solid line) ........ 98
Figure 7.14 The experimental result of the rms ripple current is 15.651 A at 300 V dc link
voltage (Analyzed from the saved data by WVF Viewer from Yokogawa) .............. 102
Figure 7.15 Synchronized the inverter phase A reference signal (yellow) with the converter Vx
and V y low frequency triangle reference signal ( Vx is green and V y is Purple)...... 103
Figure 7.16 The experimental result of the proposed carrier modulation signal for dc-dc boost
converter..................................................................................................................... 104
xiv
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