Patent ID: 7327124

Claim:
A control apparatus for a boost-inverting converter having a first switch connected between a first output and a first node, a second switch connected between a first input and the first node, an inductor connected between the first node and a second node to flow with an current therethrough, a third switch connected between the second node and a second input, a fourth switch connected between the second node and a second output, a first capacitor connected between the first output and second input, and a second capacitor connected between the second output and second input, the control apparatus comprising: a first error amplifier for producing a first signal by amplifying a first difference between a first reference signal and a first feedback signal derived from a first output voltage at the first output; a second error amplifier for producing a second signal by amplifying a second difference between a second reference signal and a second feedback signal derived from a second output voltage at the second output; a combiner for producing a third signal by combining the first signal multiplied by a first parameter and the second signal multiplied by a second parameter; a waveform generator for producing a fourth signal; a first comparator for producing a first control signal by comparing the first signal with the fourth signal; a second comparator for producing a second control signal by comparing the second signal with the fourth signal; a third comparator for producing a third control signal by comparing the third signal with the fourth signal; and a logical circuit for switching the four switches based on the three control signals, wherein the first and second switches will not turn on simultaneously, and the third and fourth switches will not turn on simultaneously; whereby when the second and third switches turn on and the first and fourth switches turn off, the inductor is energized, and when the second and third switches turn off and the first and fourth switches turn on, the first capacitor is discharged to produce the first output voltage, and the second capacitor is charged to produce the second output voltage.