Abstract: The photovoltaic system includes an inverter, a fan, and a controller. A photovoltaic string and a direct current bus capacitor are connected between a positive input end and negative input end of the inverter. The controller receives a fast shutdown instruction and sends a drive signal to a switching transistor in the inverter, so that the switching transistor performs a switching action under the action of the drive signal, and the switching transistor consumes electric energy during the switching action; or the controller turns on the fan after receiving the fast shutdown instruction to consume electric energy by using the fan; or the controller may send the drive signal to the switching transistor and also control the fan to be turned on, so that both the switching transistor and the fan consume electric energy.

Abstract: An electronic atomization device includes a liquid guide substrate, a heating component, an atomizer. The liquid guide substrate includes a body that having a first surface and a second surface arranged opposite to each other. A porous layer inside the body which includes a plurality of liquid passing through holes and a plurality of bypass holes. The liquid passing through holes extend through the first surface and the second surface along a first direction. The bypass holes are in communication with the liquid passing through holes along a second direction. The liquid passing through holes and the bypass holes are curved holes.

Abstract: A power supply system including a plurality of energy storage units and a plurality of power converters, and the energy storage unit is electrically connected to a corresponding power converter. First controllers in the energy storage units sequentially control actions of the at least two switches. The second controller in the power converter obtains the direct current voltage received by the power conversion circuit; and when change amplitude of the direct current voltage is greater than a preset threshold, sends, through a communication connection, change information of the direct current voltage to the first controller that is communicatively connected to the second controller; otherwise, sends maintaining information of the direct current voltage. When controlling the voltage output by the direct current power supply to change, and when receiving the maintaining information of the direct current voltage, the first controller outputs a signal indicating a cable connection error.

Abstract: A photovoltaic power generation system and a method and a device for detecting an earth fault of a photovoltaic string. The controller obtains a terminal voltage of each photovoltaic string before voltage disturbance, where the terminal voltage is a voltage to earth of a positive electrode or negative electrode of the photovoltaic string; performs voltage disturbance on each photovoltaic string and obtains a terminal voltage of each photovoltaic string after the voltage disturbance; determines a photovoltaic string with an earth fault based on the terminal voltage of each photovoltaic string before and after the voltage disturbance; obtains a photovoltaic panel with an earth fault by using the terminal voltage and an output voltage of the photovoltaic string before the voltage disturbance, or obtains a photovoltaic panel with an earth fault by using the terminal voltage and an output voltage of the photovoltaic string after the voltage disturbance.

Abstract: A heating element for heating and atomizing an aerosol generation substrate includes: a support tube; and a conduction layer arranged on an outer side of the support tube and in communication with the support tube, the conduction layer having an integrally braided structure. In an embodiment, a thickness of the conduction layer is greater than or equal to 0.1 mm and less than or equal to 3 mm.

Abstract: The photovoltaic system includes an inverter, a fan, and a controller. A photovoltaic string and a direct current bus capacitor are connected between a positive input end and negative input end of the inverter. The controller receives a fast shutdown instruction and sends a drive signal to a switching transistor in the inverter, so that the switching transistor performs a switching action under the action of the drive signal, and the switching transistor consumes electric energy during the switching action; or the controller turns on the fan after receiving the fast shutdown instruction to consume electric energy by using the fan; or the controller may send the drive signal to the switching transistor and also control the fan to be turned on, so that both the switching transistor and the fan consume electric energy.

Abstract: A photovoltaic power generation system and a method and a device for detecting an earth fault of a photovoltaic string. The controller obtains a terminal voltage of each photovoltaic string before voltage disturbance, where the terminal voltage is a voltage to earth of a positive electrode or negative electrode of the photovoltaic string; performs voltage disturbance on each photovoltaic string and obtains a terminal voltage of each photovoltaic string after the voltage disturbance; determines a photovoltaic string with an earth fault based on the terminal voltage of each photovoltaic string before and after the voltage disturbance; obtains a photovoltaic panel with an earth fault by using the terminal voltage and an output voltage of the photovoltaic string before the voltage disturbance, or obtains a photovoltaic panel with an earth fault by using the terminal voltage and an output voltage of the photovoltaic string after the voltage disturbance.