Abstract: A startup control method for a DC/DC converter is used for starting the DC/DC converter with energy transferred from a low-voltage side to a high-voltage side, and includes: determining a duty cycle or a frequency of a driving signal based on at least a voltage spike reference value and a voltage spike measurement value of a power switch at the low-voltage side; and outputting the driving signal to the power switch, thereby controlling the on and off of the power switch. The startup control method for a DC/DC converter of the disclosure can improve a reverse charging power of the converter to the maximum extent and reduce the time needed for charging a bus capacitor during a reverse startup process while ensuring voltage stress on the power switch not to exceed a limit.

Abstract: An islanding detection system and method for multiple inverters operating in parallel, wherein the multiple inverters at least comprises a first inverter and a second inverter connected in parallel. The islanding detection system comprises a current detection circuit arranged on a grid side or an AC side of the second inverter; and a controller connected to the current detection circuit and the first inverter. The controller determines whether to perform distributed islanding detection or centralized islanding detection on the first inverter and the second inverter according to a grid voltage signal and a current detection signal of the current detection circuit. By recognizing the islanding detection mode of the second inverter, matching it with typical islanding detection modes preset in a library, and determining to perform a distributed or centralized islanding detection according to matching results, the application improves the success ratio of islanding detection.

Abstract: The application provides a dispersed carrier phase-shifting method and system. The method includes connecting at least two power modules to form a modular system; each power module including a control module for sampling at least twice a common state variate, signs of slopes of the common state variate at a first and second sampling time are opposite, and a reference time of the first sampling time for each control module is the same; and regulating a carrier frequency of the power module according to a relative size between a sampled values at the first and second sampling time. According to embodiments herein, carrier phase-shifting of modular system may be implemented without communication between respective modules. Under closed-loop control, optimal carrier phase-shifting can be automatically achieved under various duty ratios, thereby having good stability.

Abstract: A high-voltage DC transformation apparatus, a power system and a control method of the power system. The high-voltage DC transformation apparatus is electrically connected to at least one high-voltage DC power generator. The high-voltage DC transformation apparatus includes at least one bidirectional AC/DC conversion module, at least one first transformer and at least one unidirectional rectifier module. A DC terminal of the bidirectional AC/DC conversion module is electrically connected to the corresponding high-voltage DC power generator. The first transformer includes a first transmission terminal and a second transmission terminal. The first transmission terminal is electrically connected to an AC terminal of the corresponding bidirectional AC/DC conversion module. The unidirectional rectifier module includes an input terminal and an output terminal.

Abstract: The application relates to battery internal resistance detection device and method for power conversion device. The detection device includes a data acquisition module for acquiring a battery voltage and a battery current to obtain a DC voltage, an AC voltage, a DC current and an AC current, a first calculation module for receiving the AC current and the AC voltage at a certain instant to output a first internal resistance value and a battery capacitance, a second calculation module for receiving a plurality of DC currents and a plurality of DC voltages at multiple instants and the battery capacitance to output a second internal resistance value, and a selection module for receiving the first and second internal resistance value and selecting one of the first and second internal resistance value as battery internal resistance value. The application improves detection accuracy of battery internal resistance by combining DC and AC algorithms.

Abstract: A transformer includes an insulation member, a high voltage part, and a low voltage part, the insulation member includes a first insulator, a second insulator, and a reference plane, the high voltage part is disposed on a first side of the reference plane, the low voltage part is disposed on a second side of the reference plane, the first insulator is disposed on the reference plane, at least a portion of the second insulator is located around the high voltage part, at least one air passage is formed by the insulation member, and at least a portion of the air passage is located within a height of the high voltage part in a normal direction of the reference plane.

Abstract: The present application provides a detecting method of an operating state of a power supply and a detecting apparatus, where the power supply includes a primary circuit, a transformer and a secondary circuit. The secondary circuit includes a secondary current detecting unit, a temperature detecting unit and a secondary controlling unit. Firstly the secondary current detecting unit detects a current value of the secondary circuit, then the secondary controlling unit compares the current value of the secondary circuit with a preset current threshold. When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature detecting unit detects a temperature value of the power supply and the secondary controlling unit determines the operating state of the power supply according to the acquired temperature value of the power supply.

Abstract: The present disclosure provides an islanding detection method for an inverter and a corresponding apparatus. The islanding detection method includes: step A1: obtaining a parameter of an output voltage of a three-phase AC system and a steady-state value corresponding to the parameter within a period of time; step A2: obtaining a disturbance signal based on the parameter and the steady-state value; step A3: superimposing the disturbance signal on at least one reference value of a droop control; and step A4: detecting the parameter added with the disturbance signal, and determining that island occurs in response to the parameter greater than an upper limit or less than a lower limit.

Abstract: A precharge system and method are provided. The precharge system comprises a load circuit, a precharge circuit and a control circuit. The load circuit comprises an input terminal, an input switch and a bus capacitor. The precharge circuit comprises a precharge resistor and a precharge switch. The precharge method comprises: during the load circuit being in a precharge mode, controlling the input switch to be in an off state, and controlling the precharge switch to switch between the on and off state for multiple times; and during the load circuit being in a work mode, controlling the input switch to be in an on state. During the load circuit being in the precharge mode, when the precharge switch is in the on state, a consuming power of the precharge resistor is larger than a threshold power and is smaller than or equal to a limit power of the precharge resistor.

Abstract: The invention discloses a converter adaptable to a wide range output voltage and a control method thereof. The converter comprises a PWM half-bridge circuit. The control method comprises the steps of: controlling the PWM half-bridge circuit to enter into a discontinuous conduction mode by regulating a switching frequency; when the PWM half-bridge circuit is operated in the discontinuous conduction mode, oscillation occurs among the output inductor, a magnetizing inductor of the transformer and a parasitic capacitor of the PWM half-bridge circuit, and when a center point voltage of the primary switching bridge arm reaches a valley or a peak, turning on the corresponding power switch. The invention reduces switching loss by controlling the corresponding power switch in the PWM half-bridge circuit to turn on when a voltage across the power switch is oscillated to valley.

Abstract: A multilevel conversion circuit having a flying capacitor is provided, including: a first bridge arm; a second bridge arm including a flying capacitor, the midpoints of the second and first bridge arms connected to a series branch defined by a first current limiting circuit, a power supply and an inductor; a DC bus capacitor connected in parallel to the first and second bridge arms; a rectifier circuit having an input end coupled to the power supply and an output end connected to a first auxiliary power supply; and a controller coupled to the first auxiliary power supply and the plurality of switches of the second bridge arm to control corresponding switches of the second bridge arm, the power supply charges the flying capacitor through the corresponding switches of the first and second bridge arms and the first current limiting circuit.

Abstract: The present disclosure provides a wireless charging system and a control method thereof. The control method includes: when the battery pack is in over-discharged state, controlling the power transmitting module to wirelessly transmit first preset power, i.e.

Abstract: The present disclosure provides a wireless communication device and a control method thereof. The wireless communication device includes a first communication control module and a second communication control module.

Abstract: Provided are a wireless power transmission apparatus and a control method thereof. The apparatus includes a transmitting unit which includes an inverter circuit, a first compensation circuit, and a transmitting coil; a receiving unit which includes a receiving coil, a second compensation circuit, and a rectifier circuit; a power regulation unit configured to regulate an output signal of the wireless power transmission apparatus; and a control unit configured to: acquire a voltage-and-current phase difference of the transmitting unit, a detection signal, and a power detection value of the wireless power transmission apparatus; control an operating frequency of the inverter circuit according to the voltage-and-current phase difference and a preset phase difference, and generate a power derating signal according to the detection signal, and control, according to the power derating signal, the power detection value and a power reference signal, the power regulation unit to regulate the output signal.

Abstract: The disclosure provides a method for supplying power to a power receiving device, comprising performing a wireless charging function comprising a first detection operation for transmitting a detection signal to detect the power receiving device; and a wireless communication function comprising a second detection operation for detecting a wireless communication tag; wherein the first detection operation comprises periodically transmitting a first group of detection signals and a second group of detection signals each comprising a plurality of detection signals, there is no other detection signal transmitted between transmission of the first group of detection signals and transmission of the second group of detection signals, and the second detection operation is performed between transmission of the first group of detection signals and transmission of the second group of detection signals. The disclosure further provides a wireless charging device for performing the wireless charging method.

Abstract: A system of providing power to a chip on a mainboard includes: a first power supply, located on the mainboard, and being configured to receive a first voltage and to provide a second voltage; and a second power supply and a third power supply, located on the mainboard and disposed at different sides of the chip, each of the second power supply and the third power supply is electrically connected to the first power supply to receive the second voltage, the second power supply provides a third voltage to the chip, the third power supply provides a fourth voltage to the chip, and ZBUS_2 ?5*(ZPS2_2+ZPDN_2), ZBUS_2 is bus impedance between the first power supply and the third power supply, ZPS2_2 is equivalent output impedance of the third power supply, and ZPDN_2 is transmission impedance between the third power supply and the chip.

Abstract: The present disclosure provides a power supply system and an electronic device. The power supply system is used to supply power to a load and includes a system board where the load is disposed; a substrate; at least one output capacitor surface-mounted on the second side of the system board; at least one positive output conductive-connected region disposed on the first side of the substrate, and being electrically connected to one terminal of the at least one output capacitor; at least one negative output conductive-connected region disposed on the first side of the substrate, and being electrically connected to other terminal of the at least one output capacitor; and at least one power unit disposed on the second side of the substrate, and being electrically connected to the at least one positive output conductive-connected region and the at least one negative output conductive-connected region.

Abstract: The invention discloses a power module and a power conversion device. The power module includes a primary converting unit including a first active device unit; a secondary converting unit including a second active device unit; a transformer including a primary unit connected to the primary converting unit and a secondary unit connected to the secondary converting unit; a first heat dissipating unit on which the primary unit and the first active device unit are disposed; a second heat dissipating unit on which the secondary unit and the second active device unit are disposed; and an insulating plate including an insulating plate body and a semi-conducting layer disposed on a surface of the insulating plate body.

Abstract: The application provides a method for controlling a PFC circuit including a diode bridge arm, DNPC bridge arm and capacitor group connected in parallel. The control method includes: switching working mode of the PFC circuit back and forth between first mode and third mode via second mode in each switching cycle when positive half cycle of a modulation wave is modulated, and switching working mode of the PFC circuit back and forth between sixth mode and fourth mode via fifth mode in each switching cycle when negative half cycle of the modulation wave is modulated. The durations of the second and fifth modes are as short as possible, thereby decreasing a current flowing into or out from midpoint of the capacitor group, and reducing voltage fluctuation at the midpoint. The application further provides a PFC circuit using the control method and a power conversion device having the PFC circuit.