| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pulse width modulation drive circuit which does not have the necessity of providing an input dead zone and can drive a load even in the range of a minute input voltage. <P>SOLUTION: The pulse width modulation drive circuit drives the load M by individually turning on/off switching elements Q1-Q4 of a bridge circuit based on pulse signals outputted from operational amplifiers 3a, 3b to which sawtooth signals and an input signals are given generated from sawtooth wave generating means 2a, 2b. The sawtooth wave generating means 2a, 2b output two sawtooth wave signals having different phases. The operational amplifiers 3a, 3b have operational amplifiers 3a, 3b each of which given one of the input signal and the sawtooth wave signal. The pulse signals pulse-width modulated in response to the input signals and outputted from the two operational amplifiers 3a, 3b individually turn on/off the sets Q1-Q3 and Q2-Q4 of the opposed switching elements of the bridge circuit to drive the load M. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
