A power inverter topology for converting a DC input to one or more phases of AC output, and methods for operating the same. The power inverter includes a switching circuit, an input circuit and a freewheeling diode bridge arrangement. The switching circuit comprises switch arms extending between the upper and lower branches of the switching circuit. The input circuit includes upper and lower isolating switches that can be selectively operated to respectively isolate the upper and/or lower branches of the switching circuit.

A photovoltaic power generation system according to an embodiment of the present invention comprises: a first converter for converting and outputting power applied from a photovoltaic power generation panel; a second converter for receiving, via a first input/output terminal, the power output by the first converter, converting same, and outputting same via a second input/output terminal, or receiving power from the second input/output terminal, converting same, and outputting same via the first input/output terminal; a third converter for receiving power from the first converter or the second converter and charging an energy storage device, or transmitting power charged in the energy storage device to the second converter; and an active power filter for reducing ripples in the second converter, wherein power stored in the active power filter is transmitted to the first converter.

An energy storage system can include a battery, a power converter comprising a first plurality of switching devices coupled to the battery and a second plurality of switching devices coupled between the first plurality of switching devices and an AC power system, and control circuitry that determines whether the AC power system is a single/split phase system or a three phase system and operates the first and second pluralities of switching devices accordingly. The control circuitry can include a microcontroller and a plurality of voltage sensors each configured to monitor a magnitude and a phase of a voltage to allow the control circuitry to determine whether the AC power system is a single/split phase system or a three phase system and whether the AC power system is connected with a line to line or line to neutral fault condition

An energy storage system can include a battery, a power converter comprising a first plurality of switching devices coupled to the battery and a second plurality of switching devices coupled between the first plurality of switching devices and an AC power system, and control circuitry that determines whether the AC power system is a single/split phase system or a three phase system and operates the first and second pluralities of switching devices accordingly. The control circuitry can include a microcontroller and a plurality of voltage sensors each configured to monitor a magnitude and a phase of a voltage to allow the control circuitry to determine whether the AC power system is a single/split phase system or a three phase system and whether the AC power system is connected with a line to line or line to neutral fault condition

An energy conversion device is provided. The device includes: a reversible pulse width modulation (PWM) rectifier (11) and a motor coil (12), where the motor coil (12) includes at least a first winding unit and a second winding unit, and the first winding unit and the second winding unit are both connected with the reversible PWM rectifier (11). The first winding unit is connected with at least one of neutral lines in the second winding unit, where at least one neutral line of at least one of the winding units is connected with a first end of a first direct current (DC) charging and discharging port (3), the reversible PWM rectifier (11) is connected with a first end of a external battery (2) and a second end of the external battery (2) respectively, and a second end of the first DC charging and discharging port (3) is connected with the second end of the external battery (2).

An energy conversion device is provided. The device includes: a reversible pulse width modulation (PWM) rectifier (11) and a motor coil (12), where the motor coil (12) includes at least a first winding unit and a second winding unit, and the first winding unit and the second winding unit are both connected with the reversible PWM rectifier (11). The first winding unit is connected with at least one of neutral lines in the second winding unit, where at least one neutral line of at least one of the winding units is connected with a first end of a first direct current (DC) charging and discharging port (3), the reversible PWM rectifier (11) is connected with a first end of a external battery (2) and a second end of the external battery (2) respectively, and a second end of the first DC charging and discharging port (3) is connected with the second end of the external battery (2).

According to the present disclosure, a bidirectional switch circuit includes a first semiconductor device including a first backside electrode electrically connected to a first pattern and a first upper surface electrode, a second semiconductor device including a second backside electrode electrically connected to a second pattern and a second upper surface electrode, a first diode including a first cathode electrode electrically connected to the first pattern and a first anode electrode, a second diode including a second cathode electrode electrically connected to the first pattern and a second anode electrode, first wiring electrically connecting the first upper surface electrode and the second anode electrode and second wiring electrically connecting the second upper surface electrode and the first anode electrode, wherein the first upper surface electrode, the second upper surface electrode, the first anode electrode and the second anode electrode are electrically connected to each other.

According to the present disclosure, a bidirectional switch circuit includes a first semiconductor device including a first backside electrode electrically connected to a first pattern and a first upper surface electrode, a second semiconductor device including a second backside electrode electrically connected to a second pattern and a second upper surface electrode, a first diode including a first cathode electrode electrically connected to the first pattern and a first anode electrode, a second diode including a second cathode electrode electrically connected to the first pattern and a second anode electrode, first wiring electrically connecting the first upper surface electrode and the second anode electrode and second wiring electrically connecting the second upper surface electrode and the first anode electrode, wherein the first upper surface electrode, the second upper surface electrode, the first anode electrode and the second anode electrode are electrically connected to each other.

An AC-AC converter can include a stack of four switches. An input of the converter can be coupled across the stack of four switches, and an output of the converter can be taken from first terminal coupled to a connection point of first and second switches of the stack and a second terminal coupled to a connection point of third and fourth switches of the stack. The converter can further include a controller that operates the switches such that during a positive half cycle of an AC input voltage, the first and second switches are operated with an alternating 50% duty cycle and the third and fourth switches are constantly on, and during the negative half cycle of the AC input voltage, the third and fourth switches are operated with an alternating 50% duty cycle and the first and second switches are constantly on.

A vehicle power system has a DC to AC converter, a pair of AC to DC converters, a transformer including a core, a primary winding wound about the core and electrically connected to an output of the DC to AC converter, and a pair of secondary windings wound about the core, a traction battery electrically connected to a collective output of the AC to DC converters, and a controller.