Multi-output power converter having single inductor

A multi-output power converter having a single inductor, comprising:

• a high-side switch, wherein a first terminal of the high-side switch is coupled with an input voltage;
• a low-side switch, wherein a first terminal of the low-side switch is connected to a second terminal of the high-side switch, a second terminal of the low-side switch is grounded, and a node between the first terminal of the low-side switch and the second terminal of the high-side switch is connected to a first terminal of the inductor;
• a control circuit connected to a control terminal of the high-side switch and a control terminal of the low-side switch, and configured to control the high-side switch and the low-side switch;
• a plurality of output switches, wherein a first terminal of each of the plurality of output switches is connected to a second terminal of the inductor;
• a signal duty distributing circuit connected to a second terminal and a control terminal of each of the plurality of output switches, wherein the signal duty distributing circuit sets duty cycles of a plurality of waveforms of a plurality of switching signals according to a plurality of output voltages respectively from the second terminals of the plurality of output switches, and the signal duty distributing circuit outputs the plurality of switching signals respectively to the control terminals of the plurality of output switches;
• a plurality of voltage divider circuits, wherein input terminals of the plurality of voltage divider circuits are respectively connected to the second terminals of the plurality of output switches;
• and
• a plurality of error amplifiers, wherein first input terminals of the plurality of error amplifiers are respectively connected to output terminals of the plurality of voltage divider circuits, second input terminals of the plurality of error amplifiers are respectively coupled with a plurality of reference voltages, and the plurality of error amplifiers are configured to respectively output a plurality of error amplified signals;
• and
• wherein the signal duty distributing circuit includes:
• a plurality of voltage-current converting circuits having input terminals that are respectively connected to the output terminals of the plurality of error amplifiers, and configured to respectively convert voltages of the plurality of error amplified signals into a plurality of error amplified currents;
• and
• a duty cycle setting circuit including:
• a charging resistor, wherein a first terminal of the charging resistor is connected to output terminals of the plurality of voltage-current converting circuits, and a second terminal of the charging resistor is grounded;
• a charging capacitor, wherein a first terminal of the charging capacitor is connected to the output terminals of the plurality of voltage-current converting circuits, and a second terminal of the charging capacitor is grounded;
• a first comparator, wherein a first input terminal of the first comparator is connected to the first terminal of the charging capacitor, and a second input terminal of the first comparator is connected to the output terminal of one of the plurality of error amplifiers;
• a second comparator, wherein a first input terminal of the second comparator is connected to the first terminal of the charging capacitor, and a second input terminal of the second comparator is connected to the first terminal of the charging resistor;
• and
• a switching signal generator circuit configured to output the plurality of switching signals respectively to the control terminals of the plurality of output switches according to a plurality of comparing signals from an output terminal of the first comparator and an output terminal of the second comparator.