A DC power attachment device provides a convenient solution in adapting DC powers from AC sockets connected to an existing power distribution circuit. It enables multitude DC devices to concurrently access multiple DC powers at the same or at different voltages on the same power attachment device, which may be coupled to a DC power source, an existing socket, or directly connected to a DC power distribution circuit. The method on the assembly of a DC power attachment device is also addressed.

A power converter circuit includes a switch including a field effect transistor, the field effect transistor being a wide bandgap field effect transistor and being configured to maintain an on operational state responsive to a maintenance signal received through a gate terminal, a current sensing circuit that is configured to estimate a drain terminal current of the field effect transistor responsive to a voltage between the gate terminal of the field effect transistor and a source terminal of the field effect transistor, and a gate driving circuit that is configured to generate the maintenance signal responsive to the estimate of the drain terminal current.

A power supply system includes a power supply circuit, a sensor of the current flowing through a terminal of the power supply circuit and a protection circuit. The protection circuit includes a differentiator adapted to measure a slope of a current measurement signal and comprises a driving stage. The power supply circuit is configured to receive a disconnection signal and, alternatively, to electrically connect the internal components thereof to its terminal or electrically disconnect the internal components thereof from its terminal, as a function of the value of the disconnection signal.

Voltage converter having overcurrent protection. In some embodiments, a voltage converter can include a voltage converting circuit configured to receive an input voltage and generate an output voltage. The voltage converter can further include an overcurrent protection circuit coupled to the voltage converting circuit and having a detection unit configured to detect an overcurrent condition associated with the voltage converting circuit. The overcurrent protection circuit can further include a consumption unit configured to selectively consume and thereby reduce a current in a path associated with the voltage converting circuit based on the detection of the overcurrent condition.

A photovoltaic power generation system includes an inverter, a controller, and at least two direct current branch circuits. The leakage current detection apparatus is configured to: detect a leakage current of the direct current branch circuit on which the leakage current detection apparatus is located and send the leakage current to the controller. The controller is further configured to: when the photovoltaic power generation system runs and a value of a leakage current of the direct current branch circuit exceeds a preset range, determine that an insulation fault occurs on the direct current branch circuit. The system can determine the direct current branch circuit on which the insulation fault occurs in the photovoltaic power generation system, so that measures are taken in time for the direct current branch circuit on which the insulation fault occurs, to eliminate a potential safety hazard.

The present disclosure provides a method for controlling a surgical instrument. The method includes connecting a power assembly to a control circuit, wherein the power assembly is configured to provide a source voltage, energizing, by the power assembly, a voltage boost convertor circuit configured to provide a set voltage greater than the source voltage, and energizing, by the voltage boost convertor, one or more voltage convertors configured to provide one or more operating voltages to one or more circuit components.

Provided is a DC/DC converter capable of providing overvoltage protection reliably without being affected by, for example, an external element connected to an output terminal. The DC/DC converter includes a comparator, an RS-FF circuit, a drive circuit, and an ON-timer circuit, and the ON-timer circuit includes: a current source circuit which provides an electric current based on a power supply voltage; a ripple generation circuit which generates a ripple voltage; an averaging circuit which averages the ripple voltage; a timer circuit which generates an ON-timer signal; and an overvoltage protection circuit (clamp circuit).

Disclosed is an overvoltage protection circuit and method thereof. The overvoltage protection circuit includes a charge/discharge circuit configured to be charged or discharged based on a source voltage of a first transistor included in a non-isolated converter and a comparison circuit, based on a voltage charged in the charge/discharge circuit exceeding a threshold voltage, turn off a power supply circuit supplying power to the non-isolated converter.

Disclosed is a switch protection circuit and a power converter, configured to set upper and lower limit-value current signals which can be adjusted along with an input voltage, so that instantaneous power of a main power switch can be prevented from being too high, and the main power switch can always be operated within a safe operating range, thereby solving the problem that the power converter is easy to be damaged in applications under a high-current circumstance.

A circuit includes a first input terminal; a second input terminal; a first output terminal; a second output terminal; a first parallel circuit including a first transistor and a first capacitor; and a second parallel circuit including a first resistor, a second resistor, a diode, and a second capacitor. The first parallel circuit and the second parallel circuit are each connected in parallel between the first input terminal and the second input terminal and in parallel between the first output terminal and the second output terminal.