Sungrow Power Supply

Disclosed are a soft-starting circuit, a power converter, a method for controlling a soft-starting circuit, a control apparatus, and a computer-readable storage medium. The soft-starting circuit includes a controller, a switching circuit, and at least two resistors. The at least two resistors are connected in series with each other in a circuit loop. The switching circuit includes at least two switches for bypassing a corresponding resistor of the at least two resistors respectively. The controller is configured to drive at least one of the at least two switches to be alternately turned on and off. In the present disclosure, a switch is drived to be alternately turned on and off through a pulsed control signal, such that a resistor corresponding to the switch is electrically connected in the circuit loop dynamically, thereby suppressing an inrush current in the circuit loop and protecting the resistor from being damaged.

Disclosed are a power converter (10), a method and apparatus for insulation detection thereof. The power converter (10) is provided with a switch between a node at which two alternating-current switches in any phase of an alternating-current side of the power converter are connected in series to each other and a virtual neutral point of the alternating-current side. The switch may be turned on while a second alternating-current switch connected thereto being turned on, to provide an alternating-current side detection loop for detecting the insulation impedance between an alternating-current side neutral point of the power converter and ground. The switch may also be turned on while a first alternating-current switch connected thereto being turned on and at least one switching transistor in the power converter being turned on, to provide a direct-current side detection loop for detecting the insulation impedance of the direct-current side of the power converter.

The present application provides a fan mounting assembly and a power device, and the fan mounting assembly includes a mounting bracket and a fan support. The mounting bracket is arranged on a side of the power device; and the fan support is connected to the fan and secured to the mounting bracket by means of a detachable connection structure. The detachable connection structure includes a limiting structure and a locking structure, and the limiting structure is configured to restrict the fan support from moving relative to the mounting bracket in a first direction. The mounting bracket has a supporting surface for supporting the fan support, and the first direction is perpendicular to the supporting surface. The locking structure is configured to lock the fan support to the mounting bracket on a side of the mounting bracket away from the power device. Since the locking structure is located on the side of the mounting bracket away from the power device, the operation space is more sufficient and it is more convenient to operate the locking structure, and the detached fan support is located in a relatively spacious place, so it may be more convenient for the disassembly and assembly as well as maintenance of the fan.

The present application discloses a heat dissipation apparatus, a heat sink and an electrical device. The heat dissipation apparatus includes a heat sink and a first bursting component, the heat sink has a heat-exchange medium channel, the first bursting component is provided on the heat sink and is in communication with the heat-exchange medium channel. When a temperature of the heat-exchange medium rises to a set value (a pressure of the heat-exchange medium rises to a bursting pressure of the first bursting component), the first bursting component breaks out. A spot bursting can be realized by setting the location of the first bursting component, and an orientated bursting can be realized by setting the orientation of the first bursting component, so that foreign matters or shock waves generated by bursting can be far away from a specific device or a specific area, thereby reducing the damage to the specific device or a personnel at the specific area. Therefore, the heat dissipation apparatus can reduce the damage caused by bursting.

A control method and a related apparatus are provided. The control method includes: determining actual maximum power limits of the multiple power units, in a process of the multiple power units outputting power with maximum output capacities; and issuing target unit power to the multiple power units respectively, based on the actual maximum power limits of the multiple power units; where the target unit power of each of the multiple power units is less than or equal to the actual maximum power limit of the power unit. The control method and the related apparatus can improve the rationality of power output distribution within the energy system.

A heat dissipation and flow guiding mechanism and a cabinet having the same are provided. The heat dissipation and flow guiding mechanism is configured for guiding a heat flow generated by an electrical device (10) and includes: a first enclosure structure (20) having a first accommodation cavity (22), and a second enclosure structure (30) located above the first enclosure structure (20) and having a flow guiding cavity (31). The first accommodation cavity (22) has a first opening (21) and is configured for mounting the electrical device (10), and the first accommodation cavity (22) is in communication with the flow guiding cavity (31) through the first opening (21). According to the present application, the influence of heat generated by a transformer in an exposed state in the related art on peripheral devices is effectively improved, and the heat dissipation capability of a transformer and an integrated all-in-one machine is further improved.

A power converter, a method for controlling a power converter, and a power supply system are disclosed. The power converter comprises a power converting circuit and a shunt branch. A first terminal of the shunt branch is connected to an output terminal of the power converting circuit. A second terminal of the shunt branch is connected to a DC positive or negative input terminal of the power converting circuit. The shunt branch is configured to shunt a current flowing from the output terminal of the power converter circuit to the DC positive input terminal of the power converting circuit, or a current flowing from the DC negative input terminal of the power converting circuit to the output terminal of the power converter circuit, in response to the input terminal of the power converting circuit being short-circuited.

An inverter, a short-circuit protection method for the inverter, and an energy system are provided. The inverter includes: a DC bus, configured to connect a DC source, where a semiconductor component is connected between the DC source and the DC bus; an inverter circuit, where a DC side of the inverter circuit is connected to the DC bus, an AC side of the inverter circuit is configured to connect a power grid via a designated relay; and a controller, configured to turn off the designated relay within a safe current breaking period of a short-circuit condition, in response to the short-circuit condition in which a DC line between the semiconductor component and the DC source is short-circuited to ground, or the DC source is short-circuited to ground, where during the safe current breaking period, a short-circuit current is 0 or less than a breaking current of the designated relay.

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