Abstract: Carrier signal generators are provided. The carrier signal generator includes a master processing module and a plurality of slave processing modules. Each slave processing module is used to control a corresponding one of universal power units of the UPS. The slave processing modules output, according to a synchronously received reference signal, control signals to control the universal power units to receive power from the mains or a rechargeable battery. When the mains is normal, each slave processing module synchronously generates a three-phase rectification control signal to rectify and output power from the mains. When the mains is abnormal, each slave processing module generates a first DC-DC control signal independently of the reference signal output by the master processing module, so as to convert and output power from the rechargeable battery. The carrier signal generator has improved compatibility and improved current conversion quality and is low cost.

Abstract: A stable control system for a three-phase rectification controller circuit is provided. The stable control system filters voltage harmonics and performs attenuation feedback compensation on current harmonics to enable a rectification circuit to achieve high stability and low THDi, while performing filtering on a direct current bus voltage in the case of an unbalanced load, so as to filter out voltage harmonics and enable the circuit to support the unbalanced load. A stable control system for an interleaved direct current booster circuit is also provided. The stable control system equalizes inter-leg currents such that a battery has good dynamic effects and good current equalization performance.

Abstract: The present disclosure provides a multi-input power converter, including three bridge arm units connected between a three-phase alternating current power supply and a positive/negative direct current bus. A first capacitor and a second capacitor are connected in series between the positive direct current bus and the negative direct current bus, and a node formed by connecting the capacitors is connected to a neutral point. Each bridge arm unit includes an inductor and a bidirectional switch unit that are connected in series, and a current direction control bridge arm connected between the positive direct current bus and the negative direct current bus, and a node formed by connecting the inductor to the bidirectional switch unit is connected to the current direction control bridge arm. Second ends of bidirectional switch units of the three bridge arm units are connected to the neutral point.

Abstract: The present invention provides a control system for a three-phase inverter, which comprises an instantaneous value voltage controller and an equivalent effective value voltage controller, wherein the instantaneous value voltage controller is configured to feed back and control an instantaneous value of an inverter output voltage, the equivalent effective value voltage controller is configured to perform an orthogonal decomposition feedback control on an effective value of the inverter output voltage, and wherein the equivalent effective value voltage controller is configured to perform integral compensation respectively on a real-axis voltage and an imaginary-axis voltage of a two-phase rotating coordinate system of the three-phase inverter, and an output of the instantaneous value voltage controller and an output of the equivalent effective value voltage controller are used to obtain the inverter output voltage through a delay stage transfer function and a controlled object transfer function.