Abstract: A method for testing and controlling a rapid shutdown device, and a tester are provided. The method includes: transmitting a heartbeat signal of first signal strength to a target rapid shutdown device in a target rapid shutdown module to switch the target rapid shutdown device on and testing the target rapid shutdown device using a preset testing program t, on receipt of a rapid shutdown device testing request, where all rapid shutdown devices in the target rapid shutdown module are previously off; and transmitting a heartbeat signal of second signal strength to the target rapid shutdown module to switch the rapid shutdown devices on or off, on receipt of a rapid shutdown device control request, where the first signal strength is lower than the second signal strength. The rapid shutdown devices can be tested and controlled efficiently, thereby effectively avoiding safety hazards and thus protecting workers.

Abstract: Disclosed are a hexavalent norovirus VLP vaccine formulation and a preparation method thereof. The formulation comprises six proteins having amino acid sequences shown in SEQ ID No. 2, SEQ ID No. 4, SEQ ID No. 6, SEQ ID No. 8, SEQ ID No. 10, and SEQ ID No. 12. A Pichia pastoris expression system was used to develop the hexavalent norovirus vaccine. Sequencing, digestion, and exogenous gene expression detection were conducted to identify recombinant vectors and select high-expression strains. VLPs were purified by sucrose density gradient centrifugation and identified by electron microscopy, with the results demonstrating that the obtained candidate hexavalent vaccine VLPs had a purity of over 95% and each VLP was intact in structure and uniform in size, indicating structural integrity and stable performance of the VLPs. The hexavalent VLP vaccine induced long-lasting and high-titer antibody responses and generated specific blocking antibodies and T cell immune responses.

Abstract: A photovoltaic solar assembly and a switching method therefor. The photovoltaic solar assembly includes an execution junction box, a single master control junction box, and a plurality of solar cell strings that are connected in series; the execution junction box includes a corresponding bypass diode; the master control junction box includes a corresponding bypass diode and a control assembly, and the control assembly is merely arranged in the master control junction box; the solar cell strings are connected in series with each other by means of the corresponding bypass diode of the execution junction box or the corresponding bypass diode of the master control junction box; and the control assembly is used for controlling connection and disconnection between the solar cell strings and a main power circuit.

Abstract: A shutdown device control method, system and apparatus, and a shutdown controller. If the shutdown controller detects that an input voltage of the shutdown controller is reduced, when the input voltage of the shutdown controller is reduced to a preset protection voltage but has not been reduced to an undervoltage protection threshold voltage, the shutdown controller controls the shutdown of a shutdown device connected to a power supply photovoltaic assembly that supplies power to the shutdown controller, so that a bypass diode connected to the power supply photovoltaic assembly bypasses the power supply photovoltaic assembly, so that the power supply photovoltaic assembly only supplies power to the shutdown controller.

Abstract: A method and a device for a current source to respond, and a computer-readable storage medium are provided. Parallel control for the current source and a voltage source is established, and a voltage across an alternating-current bus is acquired. When the voltage is lower than a first threshold, the current source outputs a current to increase the voltage across the alternating-current bus. Then, it is determined whether the voltage exceeds a second threshold. When the voltage exceeds the second threshold, the current source stops outputting the current. When the voltage does not exceed the second threshold, power is distributed between the current source and the voltage source after power synchronization. The current source directly outputs the current, and therefore unnecessarily wait for the power from the voltage source.

Abstract: A rapid shutdown device and a photovoltaic device are provided. The rapid shutdown device according to the present disclosure includes a first on-off switching transistor, a voltage module, a first driving module and a control chip. The voltage module adapts voltage outputted by a controlled photovoltaic module to the control chip. Therefore, the rapid shutdown device for a photovoltaic device formed by multiple photovoltaic modules connected in series unnecessitated a high-voltage chip. Instead, a common low-voltage chip is suitable for such photovoltaic device. Further, since an output voltage signal of the low-voltage chip is insufficient to directly drive the first on-off switching transistor connected to the controlled photovoltaic module in series, the first driving module is added to adapt the electric signal sent by the control chip to the first on-off switching transistor.

Abstract: A micro-inverter and a grid-tied output control method and device therefor. The micro-inverter comprises an inverter full-bridge circuit and an LC filter circuit. The LC filter circuit is grid-tied to a power grid by means of an output switch. The method comprises: obtaining a voltage amplitude, a frequency, and a phase of a voltage of the power grid by using phase locking; adjusting a power switching transistor driving the inverter full-bridge circuit to cause an output voltage of the micro-inverter to track the voltage of the power grid; and controlling the output switch to be switched on so that the micro-inverter operates normally. In the present application, before the output switch is turned off to grid-tie the micro-inverter, the power grid voltage is phase-locked and the output voltage of the micro-inverter is controlled to track the power grid voltage.

Abstract: A method and an apparatus for controlling a shutoff device, and a shutoff device. The method is applied to a processor of the shutoff device. The method includes: determining whether a heartbeat signal is received continuously during a first preset period; if so, controlling the N main switching transistors to be turned on, and determining whether the heartbeat signal is not received continuously during a second preset period; and if so, controlling the N main switching transistors to be turned off, and controlling the release circuit to be turned on to release a voltage on the bus. A release circuit is controlled to release voltage on the bus to the ground, thereby rapidly reducing the voltage on the bus, avoiding person danger and safety accidents caused by the long-term presence of the direct current high voltage on the bus, and improving the safety and reliability of a photovoltaic system.

Abstract: A method and an apparatus for controlling a shutoff device, and a shutoff device. The shutoff device includes N main switching transistors and N bypass switching transistors. The method includes: controlling the N main switching transistors to be turned on after receiving a heartbeat signal; determining whether a power supply voltage of a processor is less than a first under-voltage protection voltage; and if so, controlling the N main switching transistors to be turned off, and controlling the N bypass switching transistors to be turned on. Thus, N photovoltaic modules and N main switching transistors corresponding to a shutoff device are separated from multiple photovoltaic module groups, so that the photovoltaic module groups corresponding to other shutoff devices can normally output DC voltage to an inverter, and the inverter can normally output AC power for integration into a power grid, thereby ensuring the normal operation of the photovoltaic system.

Abstract: A shutoff device, including a shutoff device control chip, where the shutoff device control chip includes a voltage output port, and a configuration module configured to adjust an output voltage of the voltage output port. Since the shutoff device control chip is provided in the shutoff device, and a voltage output port and a configuration module configured to adjust the output voltage of the voltage output port are provided in the shutoff device control chip, the shutoff device output can output different voltage values by configuring the configuration module. In this case, when a connection structure between the shutoff device and the photovoltaic module in the photovoltaic system changes, it is only necessary to reconfigure the configuration module to achieve the purpose of adjusting the output voltage of shutoff device.

Abstract: Provided is a detection apparatus for a photovoltaic component, including a detection device and a control device. An input terminal of the detection device is connected to an output terminal of the breaking device. The detection device is configured to detect, based on at least one of a voltage and a current outputted from the photovoltaic component, whether the photovoltaic component and a connection circuit for the photovoltaic component operate normally. The control device is connected with the breaking device and the detection device. The control device is configured to control to switch on the breaking device, to transmit the at least one of a voltage and a current outputted from the photovoltaic component to the detection device.

Abstract: A module switchoff device and a security protection system of a photovoltaic power generation system.

Abstract: A module switchoff device and a security protection system of a photovoltaic power generation system.

Abstract: A method includes determining, by a first wireless local area network (WLAN) controller, that a first access point (AP) is an edge AP when a first STA associates with the first AP, where the edge AP is an AP neighboring to another AP, and the other AP and the edge AP are respectively managed by different WLAN controllers, and sending, by the first WLAN controller, authentication data of the first STA to at least one WLAN controller.

Abstract: A method includes determining, by a first wireless local area network (WLAN) controller, that a first access point (AP) is an edge AP when a first STA associates with the first AP, where the edge AP is an AP neighboring to another AP, and the other AP and the edge AP are respectively managed by different WLAN controllers, and sending, by the first WLAN controller, authentication data of the first STA to at least one WLAN controller.

Abstract: A method, an apparatus, and a device for managing authentication data of a station (STA), where the method includes determining, by a first wireless local area network (WLAN) controller, that a first access point (AP) is an edge AP when a first STA associates with the first AP, where the edge AP is an AP neighboring to another AP, and the other AP and the edge AP are respectively managed by different WLAN controllers, and sending, by the first WLAN controller, authentication data of the first STA to at least one WLAN controller in order to resolve a problem that system performance is affected because relatively much signaling is required by processing when a WLAN controller synchronizes authentication data of a STA when the STA associates with an AP.

Abstract: A method, an apparatus, and a device for managing authentication data of a station (STA), where the method includes determining, by a first wireless local area network (WLAN) controller, that a first access point (AP) is an edge AP when a first STA associates with the first AP, where the edge AP is an AP neighboring to another AP, and the other AP and the edge AP are respectively managed by different WLAN controllers, and sending, by the first WLAN controller, authentication data of the first STA to at least one WLAN controller in order to resolve a problem that system performance is affected because relatively much signaling is required by processing when a WLAN controller synchronizes authentication data of a STA when the STA associates with an AP.

Abstract: The invention provides a solar photovoltaic three-phase micro-inverter system comprising a plurality of three-phase micro-inverters. Every three of the three-phase micro-inverters form a group and are coupled to a three-phase AC power grid. Each of the three-phase micro-inverters comprises 3 single-phase inverter circuits, each of the single-phase inverter circuits comprises 2 conversion circuits, and each of the conversion circuits corresponds to one phase of the three-phase AC power grid. AC outputs of the same conversion circuits of the three micro-inverters in one group are coupled to three-phase live wires of the three-phase AC power grid respectively. Accordingly, the invention provides a method for improving conversion efficiency of the solar photovoltaic three-phase micro-inverter system.

Abstract: This disclosure provides universal influenza vaccines which can provide extended protection for several years, provide improved protection to circulating influenza strains that were not predicted accurately for annual vaccine manufacturing, and provide protection against newly emerging strains of influenza virus which carry the potential for establishing global pandemics.

Abstract: The invention provides a solar photovoltaic three-phase micro-inverter system comprising a plurality of three-phase micro-inverters. Every three of the three-phase micro-inverters form a group and are coupled to a three-phase AC power grid. Each of the three-phase micro-inverters comprises 3 single-phase inverter circuits, each of the single-phase inverter circuits comprises 2 conversion circuits, and each of the conversion circuits corresponds to one phase of the three-phase AC power grid. AC outputs of the same conversion circuits of the three micro-inverters in one group are coupled to three-phase live wires of the three-phase AC power grid respectively. Accordingly, the invention provides a method for improving conversion efficiency of the solar photovoltaic three-phase micro-inverter system.