Abstract: A metformin tablet, a metformin tablet for relieving pain and reducing inflammation, and a manufacturing method thereof. The tablet for relieving pain and reducing inflammation comprises: a filler, a diluent, an excipient, a binder, a slow-release agent, a sweetener, and a medicinal powder; the excipient comprises: at least one of PVP, PEG, and polymer; the medicinal powder comprises: at least one of metformin and the excipient. The metformin tablet comprises: a hollow part, a thick colloidal layer formed on an outer side of the hollow part, and a powder colloidal layer formed on an outer side of the thick colloidal layer. The tablet for relieving pain and reducing inflammation comprises: a thick colloidal layer, a powder colloidal layer formed on an outer side of the thick colloidal layer, and a hollow part located at a center of the tablet and on an inner side of the thick colloidal layer.

Abstract: A direct voltage/direct voltage converter comprising a switch-shaping circuit, a voltage-sensing device and a control device is provided. The direct voltage/direct voltage converter has several running modes. Through the control device, one of the running modes is selected to serve as a current operating mode. According to the current operating mode, the control device issues a switching signal for turning the switch-shaping circuit on or off.

Abstract: A direct voltage/direct voltage converter comprising a switch-shaping circuit, a voltage-sensing device and a control device is provided. The direct voltage/direct voltage converter has several running modes. Through the control device, one of the running modes is selected to serve as a current operating mode. According to the current operating mode, the control device issues a switching signal for turning the switch-shaping circuit on or off.