Abstract: A multi-input power converter includes three bridge arm units connected between a three-phase AC power supply and a positive/negative DC bus. First and second capacitors are connected in series between the positive and negative DC buses with a node connected to a neutral point. Each bridge arm unit includes an inductor and a bidirectional switch unit connected in series with a node connected to a current direction control bridge arm between the positive and negative DC buses. Second ends of bidirectional switch units are connected to the neutral point. In a battery mode, two of the bridge arm units are as battery mounting bridge arms to constitute a DC loop with a rechargeable battery to supply power to the positive and negative DC buses, and the remaining bridge arm unit enables an inductor thereon to alternately connect the positive and negative DC buses to balance a bus capacitance voltage.

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 power converter and a UPS including the same are provided. The power converter includes: a first power conversion module including a first and a second bridge arms, and a second power conversion module including a third and a fourth bridge arms, where first terminals of the first and second power conversion modules are configured to be capable of being electrically connected to a mains supply and/or a rechargeable battery, and second terminals are configured to be capable of being electrically connected to a DC bus; and a switch module, configured to enable the first terminals of the first and second power conversion modules to be selectively electrically connected to the mains supply and/or the rechargeable battery, where the first and second power conversion modules, and the switch module are configured to charge the rechargeable battery from the DC bus through the first and fourth bridge arms.

Abstract: Some aspects of the present disclosure provide a harmonic reduce control system for controlling an inverter, including a phase-locked loop controller, a voltage sum loop controller, a repeative controller, a current loop controller, and a harmonic obtaining module. The harmonic obtaining module detects a harmonic value of a load current. The control system generates an inverter current reference value based on a first current value output by the voltage sum loop controller and the harmonic value, calculates a real-time frequency value based on a voltage of the power grid, obtains, through calculation, a repeative controller output value based on the inverter current reference value, the inverter output current, and the real-time frequency value, and outputs a first duty cycle based on the repeative controller output value. The control system limits the inverter output current based on the first duty cycle.

Abstract: Provided is an interleaved active neutral point clamped (ANPC) circuit including N (N?2) parallel bridge arms, including: direct current (DC) terminals, including a positive and a negative DC terminal; an alternating current (AC) terminal; a switching circuit connected between the positive DC terminal and the negative DC terminal and including a first, a second, a third, and a fourth switching transistor sequentially connected in series, series nodes of the first, the second, the third, and the fourth switching transistor being sequentially a first, a second, and a third node, where the second node is connected to a neutral line; and N parallel high-frequency switching circuits connected between the first node and the third node, each of the N high-frequency switching circuits including a first and a second high-frequency switching transistor connected in series, where a phase difference between two adjacent high-frequency switching circuits among the N high-frequency switching circuits is 2?/N.

Abstract: A control system for a three-phase inverter includes an instantaneous value voltage controller and an equivalent effective value voltage controller. The instantaneous value voltage controller is configured to feed back and control an instantaneous value of an inverter output voltage. The equivalent 5 effective value voltage controller is configured to perform an orthogonal decomposition feedback control on an effective value of the inverter output voltage. 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. An output of the instantaneous value 10 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.

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.