| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive circuit capable of suppressing variation in the operating duty of a SW element to be driven even if, for example, temperature variation exists.SOLUTION: Drive circuits 10U and 10L of a power conversion system 10 include: a command-duty detection section 20 receiving a first signal S1 on the basis of a command signal SU, detecting a command duty, and outputting a second signal S2 on the basis of the command duty; operating-duty detection sections 30U and 30L receiving a third signal S3a on the basis of the actual operation of SW elements QU and QL, detecting an operating duty, and outputting a fourth signal S4 on the basis of the operating duty; and a duty comparison section 40 receiving the second signal S2 and the fourth signal S4, comparing the command duty and the operating duty, and outputting a fifth signal S5 on the basis of the comparison result. Gate control sections 1U and 1L receive the fifth signal S5 and control the pulse width of a gate signal GU so that the operating duty is not varied. |
