Abstract: Disclosed is a stack structure and its manufacturing method. The stack structure includes at least two stacked modules, wherein at least one of the modules is a power module; at least one metal connection component which is in integrated structure and comprises a first end, a second end and a connection portion with the first end being electrically connected to one of the modules and the second end being electrically connected to the other module; at least one molding compound packaging the at least one module and the end of the metal connection component which is electrically connected to the module, respectively.

Abstract: A converter module includes: a system board; and an isolated rectifier unit connected with the system board via at least one pin, the isolated rectifier unit including: a system board; a circuit module; and an isolated rectifier unit arranged adjacent to the circuit module and connected with the system board; wherein the isolated rectifier unit includes: a magnetic core comprising at least one core column parallel to the system board and two cover plates provided at both ends of the core column; and multiple carrier board units provided between the two cover plates and perpendicular to the system board, wherein each of the carrier board units comprises at least one via hole, at least one primary winding, at least one secondary winding and at least one switch connected with the at least one secondary winding.

Abstract: A control device applied to a flyback converter including an auxiliary switch includes: an output voltage integrator, configured to integrate an output voltage of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller, configured to compare the obtained amplitude of the negative magnetizing current with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero voltage switching of a primary-side switch of the flyback converter with variable outputs.

Abstract: A control device, which is applied to a flyback converter including an auxiliary switch, includes: an on-time setter, configured to set an on-time threshold according to a reference value and an output voltage of the flyback converter; and an on-time controller, configured to output a control signal to turn on the auxiliary switch, and turn off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold. According to the present disclosure, it is able to achieve zero voltage switching of a primary-side switch of the flyback converter with variable outputs.

Abstract: A method for distributing unbalanced and harmonic power among a plurality of inverters connected in parallel and operating in an islanded state, by respectively injecting an small-AC-signal in each inverter, including: sampling an output voltage and an output current of each inverter, extracting a fundamental positive sequence component, a fundamental negative sequence component, at least one major order of harmonic component from the current, and current components of the small-AC-signal; calculating an active power and a reactive power of the inverter, calculating the unbalanced and harmonic power; calculating a frequency and an amplitude of a fundamental positive sequence reference voltage, calculating a frequency reference value of the small-AC-signal; calculating a virtual impedance; calculating a voltage drop of the virtual impedance; generating a total reference voltage; and regulating the output voltage of the inverter to follow the total reference voltage.

Abstract: A regulator converting an input voltage into a supply voltage includes a first differential amplifier, a second differential amplifier, a pass element, and a feedback voltage divider. The first differential amplifier includes a reference voltage with a feedback voltage to generate a first output voltage and a first inverse output voltage. The second differential amplifier compares the first output voltage and the first inverse output voltage to generate a second output voltage. The pass element passes an output current from the input voltage to the supply voltage according to the second output voltage. The feedback voltage divider divides the supply voltage by a feedback factor to generate the feedback voltage.

Abstract: Disclosed are a photovoltaic system and its rapid shutdown method. The photovoltaic system includes a photovoltaic array including a photovoltaic array panel and a shutdown device, a junction box and an inverter, the shutdown device is electrically connected to the photovoltaic array panel and is connected to the inverter; the photovoltaic system further includes a shutdown device controller, which is coupled to the high voltage wires, and is configured for receiving a first detection signal reflecting a state of the AC side of the inverter, determining whether the AC side of the inverter is in a power-off state, outputting a first power-off signal when the AC side of the inverter is in the power-off state, and transferring the first power-off signal to the shutdown device; and the shutdown device receives the first power-off signal and prohibits the electric energy from transferring to the inverter.

Abstract: Method, apparatus and system for crosstalk suppression of power line communication are provided. The method includes: receiving a joining request message; judging a matching state of the communication terminal based on a history matching record and communication terminal identifier, if matching state of the communication terminal is unmatched: sending a joining response message to the communication terminal; receiving an acknowledgment request message sent by the communication terminal after switch of the communication terminal is turned on; detecting voltage on power line between the communication terminal and an inverter corresponding to the power line communication transmitter, if voltage is within preset voltage range, sending an acknowledgment response message to the communication terminal; storing communication terminal identifier in history matching record and storing matching state of the communication terminal as successfully-matched.

Abstract: A power module and a method for manufacturing the same are provided. The power module comprises: a substrate, at least one power device, and an organic heat dissipating structure. The substrate has an upper surface and a lower surface. The organic heat dissipating structure comprises a plurality of organic heat dissipating protrusions and it is located on the upper surface side or the lower surface side of the substrate and configured to transfer heat generated by the power device outwardly.

Abstract: The present disclosure provides an alternatingly-switched parallel circuit, an integrated power module and an integrated power package. The alternatingly-switched parallel circuit includes a first bridge arm and a second bridge arm at least partly formed in a chip containing a plurality of first cell groups and a plurality of second cell groups The plurality of first cell groups are configured to form the first upper bridge-arm switch and the plurality of second cell groups are configured to form the second upper bridge-arm switch, or the plurality of first cell groups are configured to form the first lower bridge-arm switch and the plurality of second cell groups are configured to form the second lower bridge-arm switch. The plurality of first cell groups and the plurality of second cell groups are switched on and off alternatingly.

Abstract: According to the invention, a current measurement circuit for providing a measurement signal for a controller for controlling a switching of power switches of a power converter comprises a first current sensing circuit for sensing a first bidirectional current representative of a current through a first power switch of the power converter. The first current sensing circuit is being adapted to provide a first sensing signal indicative of the first bidirectional current. The current measurement circuit further comprises a second current sensing circuit for sensing a second bidirectional current representative of a current through a second power switch of the power converter. The second current sensing circuit is adapted to provide a second sensing signal indicative of the second bidirectional current.

Abstract: The disclosure provides a preparation method of a porous copper alloy wick, including the steps of: a) preparing an electrolyte, which is an aqueous solution including 0.5-1.8 mol/L sulfuric acid and 0.1-0.5 mol/L copper sulfate; b) cleaning with a mixed solution of a surfactant and a basic compound, activating with dilute hydrochloric acid and then cleaning the surface of a copper alloy substrate; c) forming a porous structure on the substrate by electrodeposition on the treated substrate in the electrolyte; and d) washing with water, drying and then sintering the product obtained in step c). By the method of the disclosure, the porous structure with the specific arrangement, excellent capillary force and permeability can be directly obtained on the surface of the substrate, which is good for the transmission of the working liquid.

Abstract: The disclosure provides a method for preparing a porous wick, including the steps of: a) preparing an first electrolyte, which is an aqueous solution including 0.5-1.8 mol/L sulfuric acid and 0.1-0.5 mol/L copper sulfate; b) preparing a second electrodeposition electrolyte, which is an aqueous solution including 0.2-0.9 mol/L sulfuric acid and 0.4-0.9 mol/L copper sulfate; c) cleaning the surface of a metal substrate with a mixed solution of a surfactant and a basic compound, activating with dilute hydrochloric acid, and then rinsing; and d) carrying out a first elctrodeposition on the treated substrate in the first electrodeposition electrolyte, and then carrying out the second electrodeposition in the second electrodeposition electrolyte, wherein the second electrodeposition current density is smaller than the first electrodeposition current density.

Abstract: A control device applied to a flyback converter including an auxiliary switch includes: a current detector configured to detect an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller configured to compare the amplitude of the negative magnetizing current obtained by the current detector with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero-voltage switching of a primary-side switch of the flyback converter with variable outputs.

Abstract: The present application provides a method of controlling an electrical power system and an apparatus using the same. The electrical power system includes a DC bus and a DC bus capacitor connected to the DC bus. The method includes: receiving a virtual DC bus capacitance value of the DC bus capacitor; detecting a DC bus voltage; calculating an expected value of a DC bus current based on the virtual DC bus capacitance value and the DC bus voltage; and adjusting the DC bus current, so that the DC bus current reaches the expected value and thus the DC bus capacitor is equivalent to the virtual DC bus capacitance value.

Abstract: A converter module includes: a system board; and an isolated rectifier unit connected with the system board via at least one pin, the isolated rectifier unit including: a magnetic core including at least one core column parallel to the system board and two cover plates provided at both ends of the core column; and multiple carrier board units provided between the two cover plates and perpendicular to the system board, wherein the carrier board unit includes at least one via hole, at least one primary winding and at least one secondary winding; and wherein the at least one core column passes through the via hole of the carrier board unit, the pin is provided at one side of at least one of the carrier board units close to the system board and configured to connect the carrier board units with the system board.

Abstract: The present disclosure provides a DC concentrated illumination system, including a DC distribution box configured for converting a command specification that controls the state of lamps into a voltage signal with a varying amplitude, and outputting the voltage signal via a power line; and a plurality of lamp units, each includes a lamp, a power conversion unit and a simulated load unit, wherein the power conversion unit is coupled to the lamp and the simulated load unit, and is coupled to the DC distribution box via the power line. The power conversion unit receives the voltage signal and collects the state information of the lamps when the voltage signal matches a preset convention rule successfully; and the power conversion unit controls the action of the simulated load unit to get a current signal, the DC distribution box parses the current signal to obtain the state information of the lamps.

Abstract: The present disclosure provides a high-voltage transformer and an electronic power apparatus. The high-voltage transformer includes a magnetic core, a secondary coil unit, and a primary coil unit. The secondary coil unit includes a secondary winding; and the primary coil unit includes a primary winding and an insulating portion. The insulating portion forms at least one through hole. At least one primary winding encircle at least one through hole and is wrapped by the insulating portion and fixed in the insulating portion. The magnetic core passes through at least one through hole. A shielding layer is formed on a surface of the insulating portion, and the shielding layer is used for connecting a safety ground and the electrical conductivity of the shielding layer is not more than 5000 S/m.

Abstract: A coupled-inductor module includes: a magnetic core including a first magnetic column, a second magnetic column, a third magnetic column extending in a first direction and two covers extending in a second direction, the first magnetic column disposed between the second magnetic column and the third magnetic column, the two covers respectively connected to the ends of the first magnetic column, the second magnetic column and the third magnetic column; and windings including a first winding and a second winding respectively wound around the first magnetic column, the first winding and the second winding being spaced apart from each other in the first direction. The magnetic core is provided with at least one air gap, and the windings and the air gap are not overlapped with each other.

Abstract: A power chip includes: a first power switch, formed in a wafer region and having a first and a second metal electrodes; a second power switch, formed in the wafer region and having a third and a fourth metal electrodes, wherein the first and second power switches respectively constitute an upper bridge arm and a lower bridge arm of a bridge circuit, and the first and second power switches are alternately arranged along a first direction; and a metal region, at least including a first metal layer, a second metal layer and a third metal layer that are stacked, each metal layer including a first to a third strip electrodes, and strip electrodes with the same voltage potential in two adjacent metal layers are electrically coupled, wherein a routing direction of the strip electrode in the first metal layer is substantially perpendicular to the first direction.