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.

The invention relates to a method and to a device for operating a bidirectional voltage transformer connectable to a primary battery and having a primary-side smoothing capacitor, an inductive transformer, and a secondary-side clamping capacitor, wherein, before the primary battery is connected, a voltage at the primary-side smoothing capacitor is matched to a voltage of the primary battery by a cyclical transfer of charge from the secondary-side clamping capacitor. The voltage of the primary-side smoothing capacitor is matchable in this way to the voltage of the primary battery before the primary battery is connected, and current spikes thus avoided during connection of the primary battery.

A direct-current power supply parallel-machine input reverse connection prevention circuit and a server. The circuit comprises a first switch tube, second switch tube (Q2). A first end of the first switch tube is used for being connected to a positive end of a first power supply and a second end of the first switch tube is connected to a positive input end of a first driving module. A first end of the second switch tube is used for being connected to a positive end of a second power supply and a second end of the second switch tube is connected to a positive input end of a second driving module.

The present invention relates to a door operator with an abnormal voltage protection function and a method for abnormal voltage protection of a door operator. According to the present invention, before a door operator motor is electrically energized by an external power source, a controller determines whether the external power source meets the rated voltage of the door operator. In the case that the external power source meets the rated voltage, the controller activates the door operator motor; in the case that the external power source does not meet the rated voltage, the door operator motor is deactivated, and the controller issues a warning.

A safety device capable of being connected between a circuit breaker device and an electric installation powered by an electric grid providing three-phase current having a first associated frequency, using a line for conveying electric current including three phase conductors, a neutral conductor and a protection conductor. The safety device makes it possible to verify at least one electric safety condition following a cut off of electric power of the electric installation by the circuit breaker device. The safety device comprises circuitry or a processor configured to verify presence of a residual voltage above a predetermined safety threshold on at least one of the conductors, and verify isolation between a tested pair of conductors, among the phase conductors. The safety device can be used to perform an associated safety verification method.

A switching power supply device includes: a latch circuit to be set by a latch signal that is generated when an anomaly is detected, the latch circuit stopping the turning ON and OFF of the switching element when set by the latch signal; a pulse generator that receives said latch signal and generates a pulse signal at a prescribed cycle in response to said latch signal; a discharge circuit that is activated every time said pulse signal is provided so as to discharge electric charges stored in the capacitor; and a comparator for undervoltage protection that, when said control power supply voltage decreases to a prescribed operation stop voltage as said capacitor discharges, resets the latch circuit and the pulse generator, respectively.

An electronic device is configured with sub-assemblies including a main logic board, flexible printed circuit, and dual battery packs that are assembled together with electrical connectors to enable power from the battery packs to flow over a power bus that is distributed along the flexible printed circuit and main logic board. A protection circuit module (PCM) in each battery pack is configured to determine a state of each of the connections among the sub-assemblies (i.e., whether or not properly assembled to provide electrical continuity through the connector) so that power from the battery packs is switched on to the power bus only when electrical continuity is verified at each of the connectors. In the event that any connection is faulty, for example due to a misalignment of a connector during assembly that prevents electrical continuity to be established through a connector, neither PCM will switch power on to the power bus.

The present invention relates to a glow time control device (100) for controlling glow rods (206-209) in a vehicle (200). The glow time control device (100) comprises a control unit (IC1), at least two power transistors (T1, T4) and a protective circuit (T6, T7). The control unit (IC1) comprises a control output (GG1) for emitting a control signal, a supply voltage input (VCC) and a supply voltage output (VDD). The control unit (IC1) provides an output voltage at the supply voltage output (VDD) depending on a voltage at the supply voltage input (VCC). A corresponding glow rod control output (G1, G4) is assigned to each of the power transistors (T1, T4) and the control inputs of the power transistors (T1, T4) are coupled to the control output (GG1). The protective circuit (T6, T7) comprises a protective circuit output which is coupled to the control inputs of the power transistors (T1, T4), and an input which is coupled to the supply voltage output (VDD). The protective circuit adjusts a predefined potential at the protective circuit output if the output voltage of the control unit (IC1) is below a predefined value.

Circuits and methods concerning voltage surge protection are disclosed. In an example embodiment, an apparatus includes a switching circuit configured to enable a current path between a first node and a second node in a first mode and disable the current path in a second mode. A biasing circuit configured to, in the surge protection mode, prevent a voltage surge at the first node from enabling the current path to the second node by biasing a voltage of the control node.

A data interface with overvoltage protection circuitry includes a bus interface and power rectification stage configured to provide supply and return voltages for the data interface and overvoltage protection circuitry, a first power level overvoltage protection circuit, a second power level overvoltage protection circuit, a DALI endpoint power output port, a power supply for a DALI endpoint device drawing current from the power output port, a receiver configured to receive signals on the DALI bus, and, a transmitter configured to send signals on the DALI bus.