Voltage conversion system and control method thereof

1 . A voltage conversion system, comprising:

a multi-phase voltage converter coupled to a load and comprising:

a first phase circuit;

a second phase circuit;

a third phase circuit, wherein the first phase circuit, the second phase circuit, and the third phase circuit enter a charging state in sequence during a first period; and

at least one driver circuit coupled to the first phase circuit, the second phase circuit, and the third phase circuit; and

a controller coupled to the at least one driver circuit, wherein according to a trigger event, the controller outputs at least one driving signal to the at least one driver circuit such that the at least one driver circuit adjusts the second phase circuit or the third phase circuit to be an activation item with highest priority during a second period after the first period,

wherein when the trigger event is that a total current decreases and the second phase circuit has a maximum current or a highest temperature in a non-power-saving mode, the controller outputs the at least one driving signal to the at least one driver circuit such that during the second period after the first period, the at least one driver circuit adjusts the third phase circuit to be the activation item with highest priority, controls the third phase circuit and the first phase circuit to enter the charging state in sequence, and controls the second phase circuit to remain in a discharging state.

2 . The voltage conversion system of claim 1 , wherein each of the first phase circuit, the second phase circuit, and the third phase circuit comprises a high-side switch and a low-side switch,

wherein when the second phase circuit is in the charging state, the high-side switch of the second phase circuit is turned on and the low-side switch of the second phase circuit is turned off,

wherein when the second phase circuit is in the discharging state, the high-side switch of the second phase circuit is turned off and the low-side switch of the second phase circuit is turned on.

3 . The voltage conversion system of claim 1 , wherein, during a third period after the second period, the controller controls the third phase circuit to enter the charging state, controls the first phase circuit to remain in the discharging state, and controls the second phase circuit to remain in an off state.

4 . The voltage conversion system of claim 3 , wherein each of the first phase circuit, the second phase circuit, and the third phase circuit comprises a high-side switch and a low-side switch,

wherein when the second phase circuit is in the off state, the high-side switch of the second phase circuit and the low-side switch of the second phase circuit are turned off.

5 . A voltage conversion system, comprising:

a multi-phase voltage converter coupled to a load and comprising:

a first phase circuit;

a second phase circuit;

a third phase circuit, wherein the first phase circuit, the second phase circuit, and the third phase circuit enter a charging state in sequence during a first period; and

at least one driver circuit coupled to the first phase circuit, the second phase circuit, and the third phase circuit; and

a controller coupled to the at least one driver circuit, wherein according to a trigger event, the controller outputs at least one driving signal to the at least one driver circuit such that the at least one driver circuit adjusts the second phase circuit or the third phase circuit to be an activation item with highest priority during a second period after the first period,

wherein when the trigger event is a power-saving mode, during a first power-saving duration after the first period, the controller controls the second phase circuit to enter the charging state according to a charging order of the first period, and controls the first phase circuit and the third phase circuit to remain in an off state, and the controller adjusts the second phase circuit to be the activation item with highest priority and the first phase circuit to be an activation item with lowest priority according to the charging order.

6 . The voltage conversion system of claim 5 , wherein in the power-saving mode, the controller controls the third phase circuit to enter the charging state and controls the first phase circuit and the second phase circuit to remain in the off state during a second power-saving duration after the first power-saving duration.

7 . A voltage conversion system, comprising:

a multi-phase voltage converter coupled to a load and comprising:

a first phase circuit;

a second phase circuit;

a third phase circuit, wherein the first phase circuit, the second phase circuit, and the third phase circuit enter a charging state in sequence during a first period; and

at least one driver circuit coupled to the first phase circuit, the second phase circuit, and the third phase circuit; and

a controller coupled to the at least one driver circuit, wherein according to a trigger event, the controller outputs at least one driving signal to the at least one driver circuit such that the at least one driver circuit adjusts the second phase circuit or the third phase circuit to be an activation item with highest priority during a second period after the first period,

wherein when the trigger event is a power-saving mode, under a condition that the second phase circuit is a present activated phase circuit while a power-saving mode command switching to a high logic value, during a first power saving duration, the controller controls the second phase circuit to enter the charging state, and the controller controls the first phase circuit and the third phase circuit to remain in an off state, and the controller adjusts the second phase circuit to be the activation item with highest priority and the first phase circuit to be an activation item with lowest priority.

8 . The voltage conversion system of claim 7 , wherein the multi-phase voltage converter further comprises a fourth phase circuit,

wherein the first phase circuit, the second phase circuit, the third phase circuit, and the fourth phase circuit enter the charging state in sequence during the first period,

wherein in the power-saving mode, under a condition that the fourth phase circuit is the present activated phase circuit while the power-saving mode command switching to the high logic value again, during a second power-saving duration, the controller controls the fourth phase circuit to enter the charging state, and the controller controls the first phase circuit, the second phase circuit, and the third phase circuit to remain in the off state.