Abstract: A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Abstract: The present disclosure provides a power supply system and an electronic device. The power supply system is used to supply power to a load and includes a system board where the load is disposed; a substrate; at least one output capacitor surface-mounted on the second side of the system board; at least one positive output conductive-connected region disposed on the first side of the substrate, and being electrically connected to one terminal of the at least one output capacitor; at least one negative output conductive-connected region disposed on the first side of the substrate, and being electrically connected to other terminal of the at least one output capacitor; and at least one power unit disposed on the second side of the substrate, and being electrically connected to the at least one positive output conductive-connected region and the at least one negative output conductive-connected region.

Abstract: The present disclosure provides a power supply system and an electronic device. The power supply system is used to supply power to a load and includes a system board where the load is disposed; a substrate; at least one output capacitor surface-mounted on the second side of the system board; at least one positive output conductive-connected region disposed on the first side of the substrate, and being electrically connected to one terminal of the at least one output capacitor; at least one negative output conductive-connected region disposed on the first side of the substrate, and being electrically connected to other terminal of the at least one output capacitor; and at least one power unit disposed on the second side of the substrate, and being electrically connected to the at least one positive output conductive-connected region and the at least one negative output conductive-connected region.

Abstract: The present disclosure provides a power supply system and an electronic device. The power supply system is used to supply power to a load and includes a system board where the load is disposed; a substrate; at least one output capacitor surface-mounted on the second side of the system board; at least one positive output conductive-connected region disposed on the first side of the substrate, and being electrically connected to one terminal of the at least one output capacitor; at least one negative output conductive-connected region disposed on the first side of the substrate, and being electrically connected to other terminal of the at least one output capacitor; and at least one power unit disposed on the second side of the substrate, and being electrically connected to the at least one positive output conductive-connected region and the at least one negative output conductive-connected region.

Abstract: In an example, a solar power generation system includes solar panels, DC optimizers, and inverters. The numbers of the solar panels and the DC optimizers are both N, and the number of the inverters is M. An output of each solar panel is connected to a DC optimizer. The DC optimizer is mainly used to track the maximum power point of the solar panel and stabilize the current, thereby maximizing the output power of the solar panel. Moreover, outputs of all DC optimizers are connected in parallel to construct a DC bus, inputs of the M inverters are connected in parallel, the M inverters whose inputs are connected in parallel extract current from the DC bus, and outputs of the M inverters are also connected in parallel to the same power grid. Advantages of safety, reliability and high power generation efficiency are implemented.

Abstract: In one aspect of the present invention, a converter circuit with input voltage balance includes a plurality of modules having inputs electrically series-connected to each other and outputs electrically parallel-connected to each other and a plurality of switching circuits with each electrically connected to an input connection node of a corresponding module and its immediate next module, and configured such that when an input voltage of the corresponding module or its immediate next module is in a desired range from a first predetermine value to a second predetermined value greater than the first predetermined value, the switching circuit operates in an open state, while when the input voltage is out of the desired range, the switching circuit operates in a conductive state so as to regulate the input voltage of the corresponding module or its immediate next module in the desired range.

Abstract: In one aspect of the present invention, a converter circuit with input voltage balance includes a plurality of modules having inputs electrically series-connected to each other and outputs electrically parallel-connected to each other and a plurality of switching circuits with each electrically connected to an input connection node of a corresponding module and its immediate next module, and configured such that when an input voltage of the corresponding module or its immediate next module is in a desired range from a first predetermine value to a second predetermined value greater then the first predetermined value, the switching circuit operates in an open state, while when the input voltage is out of the desired range, the switching circuit operates in a conductive state so as to regulate the input voltage of the corresponding module or its immediate next module in the desired range.

Abstract: An energy recycle system for use with an AC current power supply, for example, an electronic ballast, is presented. The energy recycle system includes an energy recycle load connected to an output terminal of the AC current power supply, in which the energy recycle load includes a rectifier for rectifying the output AC current of the AC current power supply into a rectified DC current and a filter connected to the rectifier for removing the high-frequency harmonics from the rectified DC current. Also, the energy recycle system further includes a DC-AC converter connected to the energy recycle load for receiving the DC current outputted from the energy recycle load, which is in turn delivered to the utility grid to achieve energy recycling.

Abstract: An energy recycle system for use with an AC current power supply, for example, an electronic ballast, is presented. The energy recycle system includes an energy recycle load connected to an output terminal of the AC current power supply, in which the energy recycle load includes a rectifier for rectifying the output AC current of the AC current power supply into a rectified DC current and a filter connected to the rectifier for removing the high-frequency harmonics from the rectified DC current. Also, the energy recycle system further includes a DC-AC converter connected to the energy recycle load for receiving the DC current outputted from the energy recycle load, which is in turn delivered to the utility grid to achieve energy recycling.