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US 9,960,682 B2Granted
Single inductor positive and negative voltage output device
AssigneeSg Micro Corp
InventorXiang Yu
Life of this patent
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AssigneeSg Micro Corp
InventorXiang Yu
Estimating the term…
A single inductor positive and negative voltage output device, which not only reduces a chip area, but also meets mutual independent application needs of positive and negative voltage output load currents, which includes an inductor L, one end of the inductor L is connected to the drain of a first PMOS power switch M1 and to the drain of a third NMOS power switch M3 respectively, the other end of the inductor L is connected to the drain of a second NMOS power switch M2 and to the source of a fourth PMOS power switch M4 respectively, the gates of M1, M2, M3 and M4 are respectively connected to a drive circuit (1), the source of M1 is connected to a power supply terminal VIN, the source of M2 is connected to a ground terminal (6), the source of M3 is connected to a negative voltage output end VON, the drain of M4 is connected to a positive voltage output end VOP, the negative voltage output end VON is connected to ground terminal by a negative terminal capacitor CON, the positive voltage output end VOP is connected to ground terminal by a positive terminal capacitor COP, the positive voltage output end VOP by a positive terminal feedback circuit and the negative voltage output end VON by a negative terminal feedback are respectively connected to the drive circuit (1) by a logic control circuit (15).
A single inductor positive and negative voltage output device, which includes an inductor, one end of the inductor is connected to the drain of a first PMOS power switch and to the drain of a third NMOS power switch respectively, the other end of the inductor is connected to the drain of a second NMOS power switch and to the source of a fourth PMOS power switch respectively, the gate s of the first PMOS power switch, the second NMOS power switch, the third NMOS power switch and the fourth PMOS power switch are respectively connected to a drive circuit, the source of the first PMOS power switch is connected to a power supply terminal, the source of the second NMOS power switch is connected to a ground terminal, the source of the third NMOS power switch is connected to a negative voltage output terminal, the drain of the fourth PMOS power switch is connected to a positive voltage output terminal, the negative voltage output terminal is connected to ground terminal by a negative terminal capacitor, the positive voltage output terminal is connected to ground terminal by a positive terminal capacitor, the positive voltage output terminal is connected to a logic control circuit by a positive terminal feedback circuit, the negative voltage output is connected to the logic control circuit by a negative terminal feedback circuit, the logic control circuit is connected to the drive circuit, the positive terminal feedback circuit includes a first amplifier, the positive voltage output terminal is connected to the negative terminal of the first amplifier, the positive terminal of the first amplifier is connected to a reference voltage terminal, the negative terminal feedback circuit includes a second amplifier, the negative voltage output terminal is connected to the positive terminal of the second amplifier, the negative terminal of the second amplifier is connected to ground terminal, the output terminals of the first amplifier and the second amplifier are respectively connected to a feedback control voltage high-low selection circuit, the feedback control voltage high-low selection circuit is connected to the negative terminal of a first comparator to transmit relatively high voltage, the feedback control voltage high-low selection circuit is connected to the positive terminal of a second comparator to transmit relatively low voltage, the positive terminal of the first comparator is connected to the negative terminal of the second comparator, the feedback control voltage high-low selection circuit is connected to the logic control circuit.
A single inductor positive and negative voltage output device, which includes an inductor, one end of the inductor is connected to the drain of a first PMOS power switch and to the drain of a third NMOS power switch respectively, the other end of the inductor is connected to the drain of a second NMOS power switch and to the source of a fourth PMOS power switch respectively, the gate s of the first PMOS power switch, the second NMOS power switch, the third NMOS power switch and the fourth PMOS power switch are respectively connected to a drive circuit, the source of the first PMOS power switch is connected to a power supply terminal, the source of the second NMOS power switch is connected to a ground terminal, the source of the third NMOS power switch is connected to a negative voltage output terminal, the drain of the fourth PMOS power switch is connected to a positive voltage output terminal, the negative voltage output terminal is connected to ground terminal by a negative terminal capacitor, the positive voltage output terminal is connected to ground terminal by a positive terminal capacitor, the positive voltage output terminal is connected to a logic control circuit by a positive terminal feedback circuit, the negative voltage output is connected to the logic control circuit by a negative terminal feedback circuit, the logic control circuit is connected to the drive circuit, the positive terminal feedback circuit includes a first amplifier, the positive voltage output terminal is connected to the negative terminal of the first amplifier, the positive terminal of the first amplifier is connected to a reference voltage terminal, the negative terminal feedback circuit includes a second amplifier, the negative voltage output terminal is connected to the positive terminal of the second amplifier, the negative terminal of the second amplifier is connected to ground terminal, the output terminals of the first amplifier and the second amplifier are respectively connected to a feedback control voltage high-low selection circuit, the logic control circuit is connected to an oscillator, the oscillator is connected to a current detection device by a voltage adder, the current detection device is connected to a detection point which is located at the drain of the second NMOS power switch.
Dependencies are inferred from the claim text.