For last week problem, I have come out with a better solution. Based from my research it is better to design a combination of buck and boost circuit rather than a buck boost circuit. The combination of the circuit still can perform buck and boost in one circuit and it give a positive output value. The concepts are, during buck operation, Q1 will receive signal from PWM while Q2 is left as open circuit. And during boost operation, Q2 will receive signal from PWM while Q1 is left as closed circuit. This can be achieve by putting another switch for example double pole double throw DPDT to perform the task.
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