Z – SOURCE INVERTER – DESIGN

• POWER =16W
• V_IN=12V 
•  I_IN=1.33A
•  V_OUT=16V ,
• I_OUT =1A
• Gain of converter = T /( T_OFF -T_ON)

ON TIME CYCLE CALCULATION Gain of converter = V_OUT /V_IN Gain of converter = 16V /12V Gain of converter =1.33 V_OUT = V_IN T /( T_OFF -T_ON) 16 = 12 T /( T_OFF -T_ON) 1.33 = T /( T_OFF -T_ON) T_OFF = T-T_ON take swithching frequency is 60Khz the time=16uS 1.33 = T /( T-T_ON -T_ON) 1.33 = T /( T -2T_ON) 1.33 = 16uS /( 16uS -2T_ON) solving above we get T_ON = 2uS INDUCTOR VALUE CALCULATION  WHEN THE SHOOT THROUGH STATE , V_IN = V_L =12 FOR AN INDUCTOR VOLTAGE CURRENT BASIC RELATION IS V_L = L * dI / dt         THEN,  L = V_L  *  dt  / dI L =  V_IN  *  dt   / dI  HERE dt =2uS—- DUTY CYCLE / FREQUENCY Assume that operating frequency of the switch (mosfet here) =60 kHz AND dI IS THE RIPPLE CURRENT OF INDUCTOR I_L = I_IN =1.33A Assume that inductor ripple current = 10% of inductor current dI =10%  *  I_L dI =10%  *  1.33A dI =10%  *  1.33A dI = .133A L =  V_IN  *  dt   / dI   L = 12V  * 2uS   / * .133A L = 180uH OUTPUT CAPACITOR C1 AND C2 VALUE FOR A CAPACITOR VOLTAGE CURRENT BASIC RELATION IS I = C * dV / dt   C = I * dt / dV    dV  is output ripple voltage. Assume that output ripple voltage is about 0.01% of output voltage dV = 0.01% * 18V dV =  0.0016 V C = I * dt / dV   C = 1.33 * 2uS / 0.0016   C = 1662uF SIMULATION 3-PHASE SIMUALTION 3-PHASE GATE SIGNAL TABLE SINGLE PHASE HARDWARE -SINGLE PHASE CIRCUIT-SINGLE PHASE GATE SIGNALS WITH SHOOT THROUGH-SINGLE PHASE Program – single phase (compiler -mikro c for dspic) //crystal of 16 MHz #define s1  LATE.F0          //S1 #define s2  LATE.F1           //S2 void main() { TRISE.F0=0;TRISE.F1=0; s1=0;s2=0; while (1) { s1 =1;   Delay_us(15);    s2 =1;Delay_us(2);s1 =0; s2 =1;   Delay_us(15);    s1 =1;Delay_us(2);s2 =0; } } Program – 3 phase -not tested it with hardware (compiler -mikro c for dspic) //crystal of 16 MHz #define s1  LATE.F0          //S1 #define s2  LATE.F1           //S2 #define s3  LATE.F2   //S3 #define s4  LATE.F3  //S4 #define s5  LATE.F4   //S3 #define s6  LATE.F5  //S4 void main() { TRISE.F0=0;TRISE.F1=0;TRISE.F2=0;TRISE.F3=0; TRISE.F4=0;TRISE.F5=0; s1=0;s2=0;s3=0;s4=0;s5=0;s6=0; while (1) { s1 =1;s3 =1;s5 =1;   Delay_us(16);    s6 =1;Delay_us(1);s3 =0; s1 =1;s6 =1;s5 =1;   Delay_us(16);    s2 =1;Delay_us(1);s5 =0; s1 =1;s6 =1;s2 =1;   Delay_us(16);    s4 =1;Delay_us(1);s1 =0; s4 =1;s6 =1;s2 =1;   Delay_us(16);    s3 =1;Delay_us(1);s6 =0; s4 =1;s3 =1;s2 =1;   Delay_us(16);    s5 =1;Delay_us(1);s2 =0; s4 =1;s3 =1;s5=1;   Delay_us(16);     s1 =1;Delay_us(1);s4 =0; } } more