| 摘要 |
<P>PROBLEM TO BE SOLVED: To more widely regulate active power to be injected into a resonant load circuit of an inverter device. <P>SOLUTION: This inverter device receives the regulated output of a power-regulating circuit (23) and generates a frequency control signal for deciding the frequency (f) of a control pulse signal (V<SB>G</SB>) by a PFM circuit (42), and gives the frequency control signal of the PFM circuit (42) to a PWM circuit (24). The PWM circuit (24) decides the time ratio (λ) of the control pulse signal (V<SB>G</SB>) with the frequency (f) decided by the PFM circuit (42). Since the PFM circuit (42) generates an optimal frequency output by the regulated power of a power-regulating circuit (23) and the PWM circuit (24) superposedly controls the pulse width of the frequency output generated by the PFM circuit (42), this inverter device will not need a switching circuit which individually controls the PWM circuit (24) and the PFM circuit (42), so the circuit constitution can be simplified. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
