| CPC H02M 3/07 (2013.01) | 7 Claims |
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1. A voltage converter connected with a load, the voltage converter providing an output voltage to the load, the voltage converter comprising:
a power source providing an input voltage;
a first switching element connected between a first terminal of the power source and a first node;
a second switching element connected between the first node and a second node, wherein a second terminal of the power source is connected with the second node;
an energy storage inductor connected between the first node and a third node;
N capacitor modules connected between the third node and a fourth node, wherein N is a positive integer; and
an energy storage capacitor, wherein a first terminal of the energy storage capacitor is connected to the second node and a second terminal of the energy storage capacitor is directly connected to the fourth node, wherein the load is connected between the second node and the fourth node,
wherein each of the N capacitor modules comprises a capacitor, wherein when the voltage converter is in a first operating mode, a connection relationship between the N capacitor modules is controlled, and the energy storage inductor, the energy storage capacitor and the N capacitors of the N capacitor modules are connected with each other in series, so that the energy storage inductor, the energy storage capacitor and the N capacitors are charged by the input voltage, wherein when the voltage converter is in a second operating mode, the connection relationship between the N capacitor modules is controlled, and the energy storage inductor, the energy storage capacitor and the N capacitors of the N capacitor modules are connected with each other in parallel, so that the energy storage inductor discharges electricity and a stored energy in the energy storage inductor is transferred to the energy storage capacitor and the N capacitors,
wherein during operation of the voltage converter, M capacitor modules in the voltage converter are selected to work, wherein the M capacitor modules in the voltage converter are controlled to be in an enabled state, and (N−M) capacitor modules in the voltage converter are controlled to be in a disabled state, wherein M is a positive integer, and M is smaller than or equal to N;
wherein each of the N capacitor modules further comprises a first end, a second end, a first switching circuit, a second switching circuit and a third switching circuit, wherein a first terminal of the capacitor is connected with the first end, the first switching circuit is connected between a second terminal of the capacitor and the second end, the second switching circuit is connected between the first end and a fifth node, and the third switching circuit is connected between the second terminal of the capacitor and the second node, wherein the fourth node is coupled with the fifth node, and
wherein the voltage converter further comprises a connecting element, wherein the connecting element is coupled between the fourth node and the fifth node, and the connecting element is a third switching element or a short circuit element.
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