Abstract: An electric folding device for exterior rear-view mirror of a vehicle is provided which comprises a centralized connection piece, having a mounting portion provided for the drive gear to slide circumferentially; a limiting seat is integrally disposed on an upper part of the mounting portion, a spring is abutted against an upper end of the limiting seat; the drive gear is abutted between the limiting seat and the base. In an initial state, a reserved gap is present between the drive gear and the limiting seat/the base; the electric drive unit drives the base cam assembly to gradually slide relative to the seat cam assembly; the reserved gap is gradually eliminated until the base cam assembly is abutted against the seat cam assembly as the base is lifted up, achieving a smooth lifting function, with low requirements for the bearing capacity of gear, suitable for lightweight development, and cost-effective.

Abstract: This application provides an LLC converter, a control circuit, a soft start method, an apparatus, and a chip, to reduce start duration of the LLC converter and avoid generating a current impulse in a resonant tank. The LLC converter includes a control circuit, and a switch circuit and a resonant tank that are sequentially coupled and connected. The control circuit is configured to: generate a second drive signal based on the current of the resonant tank and a first drive signal, the second drive signal is at a preset level in a time period in which the current is greater than or equal to a current threshold, the second drive signal is used to turn off the power switch in the switch circuit, and the second drive signal is the same as the first drive signal in a time period in which the current is less than the current threshold.

Abstract: A modular multilevel converter (MMC) includes an input conversion module, an output conversion module, a common conversion module, and a common bridge arm. One end of the input conversion module is connected to Vin, the other end of the input conversion module is connected to the common conversion module through the common bridge arm, and the common conversion module is connected to Vin and Vout. One end of the output conversion module is connected to the common conversion module through the common bridge arm, and the other end of the output conversion module is connected to Vout. The input conversion module and the output conversion module share one bus capacitor.

Abstract: A DC/DC converter and a voltage gain switching method and system. A first resonance unit of the DC/DC converter includes a first terminal and a second terminal connected to a second capacitor unit, and a third terminal and a fourth terminal connected to a first capacitor unit. A second resonance unit of the DC/DC converter includes a first terminal connected to a second terminal of the second capacitor unit, and a second terminal of the second resonance unit connected to a first input/output terminal of the DC/DC converter, a third terminal connected to the ground terminal of the DC/DC converter, and a fourth terminal connected to a first voltage gain changeover switch. The DC/DC converter can improve voltage gain switching efficiency.

Abstract: A solid-state transformer (10) that maintains output voltage continuity during maintenance is provided. The solid-state transformer includes an input end (101), a plurality of power units (U1 to UM), and an output end (102). The input end is configured to input first three-phase alternating-current electrical power. The plurality of power units are connected in parallel to the input end and the output end, and each power unit is configured to convert the first three-phase alternating-current electrical power into first direct-current electrical power, and output the first direct-current electrical power from the output end. A power supply system (100) including the foregoing solid-state transformer is further included.

Abstract: Embodiments of this application disclose a power supply apparatus, a power supply system, and a data center designed to reduce the number of power conversion steps, equipment costs, and circuit loss. The power supply apparatus includes: a solid-state transformer configured to convert an alternating current into a first direct current; a first direct current/direct current converter, coupled to the solid-state transformer and configured to convert the first direct current into a second direct current; an energy storage component, coupled to the first direct current/direct current converter and configured to perform energy storage on the second direct current; and a second direct current/direct current converter, coupled to the first direct current/direct current converter and configured to convert the second direct current into a third direct current, where the third direct current is used to supply power to a load.

Abstract: Embodiments of the present invention disclose a troubleshooting method and device. The method is applicable to an inverter power supply system in the power supply device. The inverter power supply system includes at least two DC/DC modules, and any one of the DC/DC modules includes fuses F1 and F2, relays K1 and K2, inductors L1 and L2, switch modules Q1, Q2, and Q3, and direct current bus capacitors C1 and C2. The troubleshooting method includes: if it is detected that any one of the DC/DC modules is faulty, determining a faulty component in the faulty module; and if the faulty component is a C1 or a C2, and the inverter power supply system is in a battery discharging mode, turning on a Q2 in the faulty module, so that an F1 and an F2 of the faulty module are blown, to disconnect the faulty module from another DC/DC module.

Abstract: Embodiments of the application disclose a troubleshooting method and device. The method is applicable to an inverter power supply system in the power supply device. The inverter power supply system includes at least two direct current to direct current (DC/DC) power supply modules, and any DC/DC power supply module of the at least two DC/DC power supply modules includes fuses F1 and F2, relays K1 and K2, inductors L1 and L2, switch modules Q1, Q2, and Q3, and direct current bus capacitors C1 and C2. The troubleshooting method includes: if it is detected that any DC/DC power supply module of the at least two DC/DC power supply modules is a faulty module, determining a faulty component in the faulty module; and if the faulty component is a C1 or a C2, and the inverter power supply system is in a battery discharging mode, turning on a Q2 in the faulty module, so that an F1 and an F2 of the faulty module are blown, thereby disconnecting the faulty module from another DC/DC power supply module.

Abstract: An electric folding device for an outer rearview mirror includes a shell, a foundation bed, a base, a pin shaft, an electric driving unit used for driving the shell to rotate relative to the base around the axis of the pin shaft. A spring is arranged on the pin shaft in a sleeving mode, and a connecting piece is provided, which makes the shell manually rotate relatively to the foundation bed. A cam assembly is provided among the connecting piece, the foundation bed and the base. During the electric folding process, driven by the electric driving unit, the cam assembly enables the foundation bed to lift up and rotate along the pin shaft through the relative slide of the cam assembly and the elastic force of the spring. The device is compact in structure with better anti-jitter performance and smooth electric folding.

Abstract: Embodiments of the application disclose a troubleshooting method and device. The method is applicable to an inverter power supply system in the power supply device. The inverter power supply system includes at least two DC/DC modules, and any one of the DC/DC modules includes fuses F1 and F2, relays K1 and K2, inductors L1 and L2, switch modules Q1, Q2, and Q3, and direct current bus capacitors C1 and C2. The troubleshooting method includes: if it is detected that any one of the DC/DC modules is faulty, determining a faulty component in the faulty module; and if the faulty component is a C1 or a C2, and the inverter power supply system is in a battery discharging mode, turning on a Q2 in the faulty module, so that an F1 and an F2 of the faulty module are blown, to disconnect the faulty module from another DC/DC module.

Abstract: The present disclosure discloses an electric folding device for outer rearview mirror of a vehicle, which includes a shell, a foundation bed, a base, a pin shaft, an electric driving unit used for driving the shell to rotate relatively to the base around the axis of the pin shaft a spring arranged on the pin shaft in a sleeving mode, and a connecting piece which makes the shell manually rotate relatively to the foundation bed. A cam assembly is provided among the connecting piece, the foundation bed and the base. During the electric folding process, driven by the electric driving unit, the cam assembly enables the, foundation bed to lift up and rotate along the pin shaft through the relative slide of the cam assembly and the elastic force of the spring. The device is compact in structure, with better anti-jitter performance, smooth electric folding process, and less folding failure.