Abstract: This application relates to a pulse modulation control system, device, and method. The system includes a processor based on a RISC-V open-source instruction set architecture and a pulse modulation interface module. The processor is configured to receive an operation instruction of a user, and generate a data signal based on the operation instruction. The pulse modulation interface module is connected to the processor, and is configured to receive the data signal and output a preset waveform based on the data signal. Based on the RISC-V open-source instruction set architecture, the user may customize operations, which improves efficiency and flexibility of a pulse modulation process, and optimizes power consumption.

Abstract: Disclosed are a photovoltaic shutdown circuit and a photovoltaic system. The photovoltaic shutdown circuit comprises a shutdown power line, a signal receiving module, a signal processing module, and a controllable switch module. The signal processing module comprises a signal modulation unit and a threshold comparison unit. A switch end of the controllable switch module is connected in series to the shutdown power line. The signal receiving module is connected to the shutdown power line for receiving a first signal with a controlling signal; the signal modulation unit is for reverting the controlling signal; the threshold comparison unit is connected to the signal modulation unit to receive the reverted controlling signal and compare the reverted controlling signal with a set threshold to output a driving signal. The controllable switch module is connected to the threshold comparison unit to receive the driving signal and control an on/off of the controllable switch module.

Abstract: A sound generator provided in the present disclosure includes a frame, a magnetic circuit unit, and a first vibration unit and a second vibration unit arranged on two sides of the magnetic circuit unit. The magnetic circuit unit includes a first central magnetic yoke in the middle, a central magnet fixed to the first central magnetic yoke, a magnetic component arranged around the central magnet and fixed to the frame, and a connecting portion connecting the first central magnetic yoke to the magnetic component. The central magnet includes a first magnet portion fixed to the first central magnetic yoke and a second magnet portion fixed to the side of the first magnet portion away from the first central magnetic yoke, a projection area of the first magnet portion along a vibrating direction is greater than a projection area of the second magnet portion along the vibrating direction.

Abstract: The present disclosure discloses a sound device includes a frame, a magnet system, and a first vibration system and a second vibration system arranged on two sides of a magnet system. The magnet system includes a first central yoke, a central magnet mounted on the first central yoke, a side yoke surrounding the central magnet and fixed to the frame, and a connection portion connecting the first central yoke and the side yoke. The side yoke includes a first side yoke fixed to the frame and a second side yoke bending and extending from an edge of the first side yoke towards the central magnet; the connection portion connects the first central yoke and the second side yoke. The sound device in the present disclosure has higher magnetic ability and miniaturization ability.

Abstract: A power semiconductor module, a motor driver and a method for manufacturing a power semiconductor module. A thermal conductive layer is disposed between a heat sink and a power semiconductor package, where the thermal conductive layer is a thermal conductive material having metal bonding wires on a surface, or is a solid-state thermal conductive layer formed by curable silicone grease, so that both the power semiconductor package and the heat sink are combined with the thermal conductive layer to form the power semiconductor module, thereby reducing a risk of damage caused by stress generated by the power semiconductor module in a process of assembling the entire motor driver. This implements helium inspection of the power semiconductor module in advance, improves a qualification rate of secondary processing of the entire motor driver.

Abstract: A substrate, a packaged structure, and an electronic device are provided. The substrate is configured to be electrically connected to a chip. The chip includes a power terminal and a signal terminal. The substrate includes a first substrate and a second substrate mounted on the first substrate. The first substrate includes a first layout, and the first layout is configured to be electrically connected to the power terminal. The second substrate includes a second layout, and the second layout is configured to be electrically connected to the signal terminal. A spacing between lines of the second layout is less than a spacing between lines of the first layout. The substrate provided in this application has a small size and high integration.

Abstract: An injection mold and an injection molding method are provided. The injection mold includes a housing and a cover. The housing is provided with a mold cavity. The mold cavity is configured to accommodate a power module. The cover is provided with a plurality of vias. The cover is detachably connected to the housing. The cover is located in the mold cavity and locates the power module jointly with the housing. The plurality of vias are configured to match a plurality of pins of the power module. In this application, the cover is disposed, and the cover is provided with the vias for pins to pass through. By using covers with different arrangement manners of vias, a same set of injection molds can be compatible with power modules of a same series that have different locations of pins. Arrangement manners of vias on different covers are different.

Abstract: Methods and apparatuses to provide a pin, a pin combination structure and a package body are described. A baffle structure is sleeved on the pin. The baffle structure is used to prevent a plastic packaging material from overflowing from a cavity that accommodates the plastic packaging material. The cavity is in a mold for packaging the package body.

Abstract: A method for producing a power semiconductor system includes packaging a power device in plastic to form a power semiconductor component, forming a first heat dissipation face on a surface of the power semiconductor component; heating a first material between a first heat sink and the first heat dissipation face; and cooling the first material on the first heat dissipation face to connect the power semiconductor component and the first heat sink.

Abstract: A device for inspecting the rotor windings of a generator includes a sequential logic circuit that generates a full-cycle pulse. A high-voltage full-cycle pulse matching generator couples the full-cycle pulse generated by the sequential logic circuit to form a corresponding transient bidirectional rotating magnetic field pulse. The transient bidirectional rotating magnetic field pulse is transmitted to two ends and a large shaft of the generator rotor winding through an impedance-matched connecting line. The transient bidirectional rotating magnetic field pulse generates a resonance effect with each large coil in the rotor. The pulse signal coupling feedback acquisition circuit couples all waveforms reflected by the generator rotor to form a magnetic field waveform, and the magnetic field waveform is transmitted to a data acquisition system by an operational amplifier. A central processing unit transmits a digital information stream to an upper computer.

Abstract: Methods and apparatuses to provide a pin, a pin combination structure and a package body are described. A baffle structure is sleeved on the pin. The baffle structure is used to prevent a plastic packaging material from overflowing from a cavity that accommodates the plastic packaging material. The cavity is in a mold for packaging the package body.

Abstract: A device for inspecting the rotor windings of a generator includes a sequential logic circuit that generates a full-cycle pulse. A high-voltage full-cycle pulse matching generator couples the full-cycle pulse generated by the sequential logic circuit to form a corresponding transient bidirectional rotating magnetic field pulse. The transient bidirectional rotating magnetic field pulse is transmitted to two ends and a large shaft of the generator rotor winding through an impedance-matched connecting line. The transient bidirectional rotating magnetic field pulse generates a resonance effect with each large coil in the rotor. The pulse signal coupling feedback acquisition circuit couples all waveforms reflected by the generator rotor to form a magnetic field waveform, and the magnetic field waveform is transmitted to a data acquisition system by an operational amplifier. A central processing unit transmits a digital information stream to an upper computer.

Abstract: Methods and systems to manage refrigerant flow inside a shell and tube heat exchanger, such as a condenser, to reduce inundation effect are provided. A method of managing refrigerant flow may include collecting at least a portion the refrigerant in the liquid state and directing the collected refrigerant in the liquid state toward an end of an internal space of the condenser. The method may further include directing the refrigerant in the liquid form toward a subcooling section. The method may also include directing the collected in the liquid state toward a refrigerant outlet located at proximately a middle section of a length of the condenser through the subcooling section. The condenser may have one or more separation/collection pans positioned within heat transfer tubes to collect and direct the refrigerant in the liquid form. A two-stage refrigerant distributor is also disclosed.

Abstract: Methods and systems to manage refrigerant flow inside a shell and tube heat exchanger, such as a condenser, to reduce inundation effect are provided. A method of managing refrigerant flow may include collecting at least a portion the refrigerant in the liquid state and directing the collected refrigerant in the liquid state toward an end of an internal space of the condenser. The method may further include directing the refrigerant in the liquid form toward a subcooling section. The method may also include directing the collected in the liquid state toward a refrigerant outlet located at proximately a middle section of a length of the condenser through the subcooling section. The condenser may have one or more separation/collection pans positioned within heat transfer tubes to collect and direct the refrigerant in the liquid form. A two-stage refrigerant distributor is also disclosed.

Abstract: The present invention discloses a functional electrical stimulation system comprising a primary power, a boost module, an energy storage section, an output control relay, an automatic discharge circuit, a foot/hand controlled switch, a current detection chip and a current limiting fuse. The boost module comprises n DC chopper circuits connected in series, and outputs a high voltage of 100-200V. According to an enable signal and a current detection signal, the output control relay disables/enables the DC boost module. The automatic discharge circuit discharges capacitance of the energy storage section automatically when the relay turns off the power input. The Foot/hand controlled switch, the current detection chip and the current limiting fuse form a triple accident protection circuit. The functional electrical stimulation system maximizes the intensity of electrical stimulation within the range that the human body can withstand.

Abstract: The present invention discloses a functional electrical stimulation system comprising a primary power, a boost module, an energy storage section, an output control relay, an automatic discharge circuit, a foot/hand controlled switch, a current detection chip and a current limiting fuse. The boost module comprises n DC chopper circuits connected in series, and outputs a high voltage of 100-200V. According to an enable signal and a current detection signal, the output control relay disables/enables the DC boost module. The automatic discharge circuit discharges capacitance of the energy storage section automatically when the relay turns off the power input. The Foot/hand controlled switch, the current detection chip and the current limiting fuse form a triple accident protection circuit. The functional electrical stimulation system maximizes the intensity of electrical stimulation within the range that the human body can withstand.