DC-DC converter

摘要

DC-DC converter, wherein in a case of positive voltage generation, the controlling circuit controls the first to fourth switch circuits with the first to fourth controlling signals, thereby permitting conduction between the first node and the first reference node and conduction between the eighth node and the fourth reference node, then permitting conduction between the fourth node and the second reference node and conduction between the sixth node and the third reference node, and then permitting conduction between the second node and the first reference node.

主权项

1. A DC-DC converter, comprising:
a first switch circuit that permits conduction between a first reference node and any one of a first node connected to a power supply terminal, a second node connected to a positive voltage terminal at which a positive voltage is output and a third node connected to a grounding terminal in response to a first controlling signal; a second switch circuit that permits conduction between a second reference node and any one of a fourth node connected to the positive voltage terminal and a fifth node connected to the grounding terminal in response to a second controlling signal; a third switch circuit that permits conduction between a third reference node and any one of a sixth node connected to the grounding terminal and a seventh node connected to a negative voltage terminal at which a negative voltage is output in response to a third controlling signal; a fourth switch circuit that permits conduction between a fourth reference node and any one of an eighth node connected to the grounding terminal and a ninth node connected to the negative voltage terminal in response to a fourth controlling signal; a first comparing circuit that compares a voltage at the positive voltage terminal and a preset positive first reference voltage and outputs a first comparison signal responsive to the comparison result; a second comparing circuit that compares a voltage at the negative voltage terminal and a preset negative second reference voltage and outputs a second comparison signal responsive to the comparison result; and a controlling circuit that outputs the first to fourth controlling signals based on the first and second comparison signals to control operations of the first to fourth switch circuits, wherein a first capacitor is connected between the positive voltage terminal and the grounding terminal, a second capacitor is connected between the grounding terminal and the negative voltage terminal, a third capacitor is connected between the second reference node and the third reference node, and a fourth capacitor is connected between the first reference node and the fourth reference node.