Off-grid phase splitter and inverter system

An off-grid phase splitting method, comprising:

• providing a first input port and a second input port separately connected to a power supply that provides a first voltage;
• providing a first output port, a second output port, and a third output port, wherein the first output port and the second output port provide a second voltage, wherein the second output port and the third output port provide a third voltage, and wherein both the second voltage and the third voltage are less than the first voltage;
• controlling, based on a voltage difference between a voltage at both ends of a first capacitor and a voltage at both ends of a second capacitor, one of a first switch circuit and a second switch circuit to be switched on, so that one of the first capacitor and the second capacitor discharges to an inductor, wherein the first capacitor is connected between the first output port and the second output port, the second capacitor is connected between the second output port and the third output port, the first switch circuit and the second switch circuit are connected in series to form a first node between the first input port and the second input port, and the inductor is connected between the first node and the second output port;
• controlling the other one of the first switch circuit and the second switch circuit to be switched on, so that the inductor charges the other one of the first capacitor and the second capacitor;
• and
• controlling by a driving control system, based on the voltage at both ends of the first capacitor and the voltage at both ends of the second capacitor, the first switch circuit and the second switch circuit to be unidirectionally switched on, wherein the driving control system further performs operations:
• collecting, by a collector of the driving control system, the voltage at both ends of the first capacitor, the voltage at both ends of the second capacitor, and a current of the inductor;
• receiving, by a voltage regulator of the driving control system, a difference between a voltage value of the voltage at both ends of the first capacitor and a voltage value of the voltage at both ends of the second capacitor, to obtain a first current;
• receiving, by a current regulator of the driving control system, a generated current and the current of the inductor to obtain a fourth voltage;
• and
• calculating, based on the fourth voltage and a larger one of the voltage at both ends of the first capacitor and the voltage at both ends of the second capacitor, a duty cycle used to control the first switch circuit and the second switch circuit.

An inverter system, comprising:

• an inverter, configured to convert a direct current signal into an alternating current signal;
• and
• an off-grid phase splitter, including:
• a first input port and a second input port separately connected to a power supply that provides a first voltage,
• a first output port, a second output port, and a third output port, wherein the first output port and the second output port provide a second voltage, the second output port and the third output port provide a third voltage, and both the second voltage and the third voltage are less than the first voltage,
• a first capacitor connected between the first output port and the second output port, and a second capacitor connected between the second output port and the third output port,
• a first switch circuit and a second switch circuit connected in series to form a first node between the first input port and the second input port, wherein the first switch circuit and the second switch circuit are unidirectionally switched on in opposite directions,
• an inductor is connected between the first node and the second output port, wherein the first switch circuit and the second switch circuit enable electricity on the first capacitor to be transferred to the second capacitor through the inductor, or vice versa, and
• a driving control system to control, based on a voltage at both ends of the first capacitor and a voltage at both ends of the second capacitor, the first switch circuit and the second switch circuit to be unidirectionally switched on, wherein the driving control system comprises:
• a collector, configured to collect the voltage at both ends of the first capacitor, the voltage at both ends of the second capacitor, and a current of the inductor;
• a voltage regulator, configured to receive a difference between a voltage value of the voltage at both ends of the first capacitor and a voltage value of the voltage at both ends of the second capacitor, to obtain a first current;
• and
• a current regulator, configured to receive a generated current and the current of the inductor to obtain a fourth voltage, wherein
• the driving control system calculates, based on the fourth voltage and a larger one of the voltage at both ends of the first capacitor and the voltage at both ends of the second capacitor, a duty cycle used to control the first switch circuit and the second switch circuit.