Abstract: A hybrid modular multilevel converter is provided. After the voltage difference is added to the original voltage of each half-bridge submodule or the original voltage of each full-bridge submodule, a compensation voltage is obtained. According to a bridge arm current and a voltage reference value, signals of one type of submodules with the compensation voltage and signals of the other type of submodules with the original voltages are sorted. Consequently, an operating sequence of the plurality of half-bridge submodules and the plurality of full-bridge submodules is acquired. The operating modes of the half-bridge submodules and the full-bridge submodules are calculated according to the original voltages of the half-bridge submodules, the original voltages of the full-bridge submodules, the voltage reference value and the operating sequence. A corresponding driving signal is generated to control the half-bridge submodules and the full-bridge submodules.

Abstract: An AC-AC converter and a power supply system are provided. The AC-AC converter of the present disclosure includes a first AC terminal with two sub terminals, a second AC terminal with three sub terminals, and a first bridge arm with two switch assemblies. The AC-AC converter receives and converts the input power between two wires and three wires. The two switch assemblies are activated, and bidirectional power flow is allowed. The two switch assemblies are performed as a voltage source for supporting both balanced and unbalanced loads. Both active and reactive power are also supported. Moreover, the AC-AC converter of the present disclosure has the advantages of reducing weight, size and cost, and enhancing conversion efficiency.

Abstract: This disclosure provides a bipolar-independent DC power delivery system. The bipolar-independent DC power delivery system includes a grid-tied power electronic converter, a bipolar DC power busway, and a power conversion unit. The grid-tied power electronic converter connects to a medium-voltage distribution grid and converts the distribution grid voltage to two independent DC voltages with same magnitude and opposite polarities. The bipolar DC power busway connects two independent DC voltages generated from the grid-tied power electronic converter to the power conversion unit. The power conversion unit can receive or send electric power from one or two independent DC voltage(s). The proposed DC power delivery system can continue to operate at de-rated power when one of two independent DC voltages fails.

Abstract: An AC-AC converter is provided. The AC-AC converter includes a primary circuit, a secondary circuit, a transformer, a resonant tank, and a controller. The primary circuit includes four bidirectional switches, each including upper and lower switches connected back-to-back and capable of operating in four quadrants in a voltage-current plane. The first and fourth bidirectional switches operate synchronously, and the second and third bidirectional switches operate synchronously. When the input voltage is greater than a predefined threshold voltage, the first and second lower switches are maintained in an on state, and the first and second upper switches operate with PWM signals and are complementary to each other. When the input voltage is smaller than an additive inverse of the predefined threshold voltage, the first and second upper switches are maintained in the on state, and the first and second lower switches operate with PWM signals and are complementary to each other.

Abstract: A magnetic component is provided. The magnetic component includes a main magnetic core, a main winding, an auxiliary magnetic core and an auxiliary winding. The main magnetic core has a gap. The main winding is wound around the main magnetic core, and a main magnetic flux is formed by a main current flowing through the main winding. The auxiliary magnetic core is at least partially disposed in the gap. The auxiliary winding is wound around the auxiliary magnetic core, a bias magnetic flux is formed by a bias current flowing through the auxiliary winding, and a path of the bias magnetic flux is perpendicular to a path of the main magnetic flux. An inductance of the magnetic component is adjustable by controlling the bias current which determines if the auxiliary magnetic core is at least partially magnetically saturated.

Abstract: A hybrid circuit breaker and a pre-charge control method are provided. The hybrid circuit breaker includes an outer branch, a first branch, a first mechanical switch module, a second branch, an electronic switch and a current commutation circuit. The first branch is connected with the outer branch in series. The first mechanical switch module is located on the first branch. The second branch is connected with the first branch in parallel. The electronic switch is located on the second branch. The current commutation circuit includes a voltage source module and an inductor. The voltage source module is located on the second branch. The inductor is located on one of the first branch or the second branch.

Abstract: A DC power system and an insulation resistance monitor device thereof are provided. The DC power system includes positive, neutral and negative lines, a protective earthing terminal and a grounding resistor. The grounding resistor is electrically connected between the neutral line and the protective earthing terminal. The insulation resistance monitor device includes a first resistor, a first sensing resistor and a first detection circuit. The first resistor is coupled to the positive or negative line. The first sensing resistor is coupled between a second terminal of the first resistor and the protective earthing terminal. The first detection circuit is electrically connected to the first sensing resistor, and is configured to measure a sensing voltage across the first sensing resistor and detect whether an insulation resistance between the protective earthing terminal and any of the positive, neutral and negative lines is abnormal according to the sensing voltage.

Abstract: A DC-DC converter includes N upper switches, N lower switches, N pairs of flying capacitors and N subcircuits. The N lower switches are electrically connected between the N upper switches and the second terminal of the voltage source. A n-th pair of flying capacitors is coupled between a common node between the n-th and (n+1)-th upper switches and a common node between the n-th and (n+1)-th lower switches. A N-th pair of flying capacitors is coupled with the N-th upper switch and the N-th lower switch. A first subcircuit is coupled between a common node between the first upper switch and the first lower switch and a middle node of a first pair of flying capacitors. A i-th subcircuit is coupled between a middle node of a (i?1)-th pair of flying capacitors and a middle node of a i-th pair of flying capacitors.

Abstract: The present disclosure provides a printed circuit board (PCB) based planar winding structure for a main power transformer and/or an auxiliary power need. The PCB-based planar winding structure can confine electric field through magnetic core potential control and thus create partial discharge (PD) free design for medium voltage (MV) applications. Meanwhile, the winding structure can be formed in the PCB manufacturing process to create a more modular and reliable structure, thereby enhancing manufacturability. Techniques, such as termination treatment, primary and secondary winding arrangements, etc., can be used to control the electrical stress in the medium voltage applications.

Abstract: A solid-state transformer is provided. The solid-state transformer includes a first stage, a first DC bus and a second stage. The first stage is configured to receive an AC power and convert the AC power into a first DC power. The first DC bus is electrically connected to the first DC power. The second stage is electrically connected to the first stage through the first DC bus, and is configured to perform isolated step-down DC/DC conversion on the first DC power to generate a second DC power. The first stage is configured to operate at a modulation index higher than 1, and the modulation index is defined by a ratio of twice AC voltage provided by the AC power to voltage across the first DC bus.

Abstract: A power electronic system with conductor having damping function is provided. The power electronic system includes power components and a conductor. The conductor is configured to connect the power components, and includes a damping part disposed on a surface of the conductor. The damping part is at least partially formed with a damping material having different resistances at different frequencies, and a relative permeability of the damping material is greater than 1 at a frequency higher than 1 MHz. The damping part forms first and second paths for first and second power currents flowing between the power components respectively, the first power current is at a frequency higher than 1 MHz, the second power current is at a frequency lower than 1 MHz, and a resistance of the first path is higher than a resistance of the second path.

Abstract: An electric power source includes: a battery defining a state of charge; a converter in electrical communication with the battery; and a controller in operable communication with the converter, the controller including a compensation toggle circuit configured to provide a compensation toggle value based on a power output of the battery; a dynamic droop control circuit configured to receive the compensation toggle value and switch an output droop value of the dynamic droop control circuit from an upper output droop measurement to a lower output droop measurement, wherein the lower output droop measurement is based on the state of charge of the battery.

Abstract: The present disclosure provides an inductor including plural cores, each of the plural cores including a center post, the plural cores separated from each other by corresponding first gaps, each of the first gaps dimensioned to enable a flux path with a value that is one-half a value of the flux through one of the center posts.

Abstract: The present disclosure provides a wireless power transfer system and a wireless power transfer assembly. In one aspect, a wireless power transfer assembly includes a flexible printed circuit board, which is also referred to as a flexible printed circuit board structure. The flexible printed circuit board includes a litz winding. The litz winding has multiple layers of electrically insulated strands. The wireless power transfer assembly also includes a ceramic heat sink. The ceramic heat sink is arranged relative to the flexible printed circuit board in a manner that dissipates heat away from the litz winding. In another aspect, a wireless power transfer system includes a transmit unit or receive unit having an input stage, a resonator, and the wireless power transfer assembly.

Abstract: A hybrid circuit breaker and a pre-charge control method are provided. The hybrid circuit breaker includes an outer branch, a first branch, a first mechanical switch module, a second branch, an electronic switch and a current commutation circuit. The first branch is connected with the outer branch in series. The first mechanical switch module is located on the first branch. The second branch is connected with the first branch in parallel. The electronic switch is located on the second branch. The current commutation circuit includes a voltage source module and an inductor. The voltage source module is located on the second branch. The inductor is located on one of the first branch or the second branch.

Abstract: The present disclosure provides a high voltage device built from modular low voltage cells. Each low voltage cell includes a plurality of low voltage semiconductor devices and one or more low voltage passive components. Each cell can be a current-bidirectional two-quadrant switch or a four-quadrant switch. All the cells may be identical and controlled with a delay time in between. Therefore, the total on and off time of the high voltage device can be controlled to reduce the output equivalent dv/dt. The cell's voltage balancing can be achieved through a control algorithm disclosed herein.

Abstract: The present disclosure provides a motor drive integrated on-board charger to reduce the quantity of components in an electric system of an electric vehicle. Reduction of components is achieved by utilizing the motor and the motor driving inverter as a part of the on-board charger in the charging mode. By controlling relays, electrical connections of the system may be reconfigured according to its mode of operation. In one aspect, the motor and the motor driving inverter play the roles of a boost PFC, a current regulator, or both.

Abstract: The present disclosure provides a motor drive integrated on-board charger to reduce the quantity of components in an electric system of an electric vehicle. Reduction of components is achieved by utilizing the motor and the motor driving inverter as a part of the on-board charger in the charging mode. By controlling relays, electrical connections of the system may be reconfigured according to its mode of operation. In one aspect, the motor and the motor driving inverter play the roles of a boost PFC, a current regulator, or both.

Abstract: A switch circuit electrically connected to a power source and a first control source and including a plurality of switch bridge arms is provided. Each of the plurality of switch bridge arms includes a first switch and a second switch electrically connected in series. A loop formed by the first switch, the second switch and the power source is defined as a power loop. A loop formed by the first control source and the first switch is defined as a first control loop. A first mutual inductance is formed between the power loop and the first control loop. Among all the first switches, the first switch with the longer power loop has the smaller first mutual inductance.

Abstract: A component includes a magnetic core having a body formed of a first material, defining a first opening and a second opening thereon. A duct formed of a second material extends at least partially through the body between the first opening and the second opening. The first opening and the second opening are in fluid communication by way of the duct.