Abstract: Control console for a powered surgical tool that includes a transformer with a secondary winding across which the tool drive signal is present. Also internal to the transformer is a matched current source that consists of a leakage control winding and a capacitor. The current sourced by the matched current at least partially cancels out leakage current that may be present.

Abstract: In an example, a system includes a differential amplifier having a first input terminal and a second input terminal, the differential amplifier configured to be coupled to a boost diode of a boost converter. The system also includes an input diode coupled to the first input terminal and the second input terminal. The system includes a pull-up circuit coupled to the input diode and configured to be coupled to the boost diode. The system also includes a pull-down circuit coupled to the pull-up circuit. The system includes a transistor coupled to the pull-up circuit and the pull-down circuit.

Abstract: A power converter incorporating a synchronous rectifier implements adaptive gate voltage regulation for fast turn-off of the synchronous rectifier. In some embodiments, the adaptive gate voltage regulation circuit and method monitors the slope of the synchronous rectifier current during the on period of the synchronous rectifier. In response to detecting the synchronous rectifier current decreasing rapidly, a larger gate discharge current is applied to quickly discharge the synchronous rectifier gate voltage. In response to detecting the synchronous rectifier current decreasing more moderately, a smaller gate discharge current is applied to discharge the synchronous rectifier gate voltage in a moderate manner. When the synchronous rectifier can be turned off quickly, large reverse current and large drain voltage spike at the synchronous rectifier is avoided. The adaptive gate voltage regulation circuit and method is particularly useful when the power converter is operated in the discontinuous conduction mode.

Abstract: An integrated circuit with galvanic isolation is described herein. In accordance with one example, the circuit comprises a galvanic insulation barrier including a first isolation element configured to separate a first isolation domain from a second isolation domain and a first channel configured to transmit—in a first mode of operation and across the first isolation element—a logic signal from a first input in the first isolation domain to a first output in the second isolation domain. The first channel is further configured to transmit—in a second mode of operation and across the first isolation element—a serial data stream from the first input to a logic circuit in the second isolation domain, wherein the logic circuit is configured to receive—in the second mode of operation—the serial data stream and to store configuration information included in the serial data stream in a memory.

Abstract: A main comparator compares a feedback voltage VFB corresponding to an output voltage VOUT of a DC/DC converter with a reference voltage VREF and asserts a turn-on signal when the feedback voltage VFB falls below the reference voltage VREF. A timer circuit generates a turn-off signal S2 that transitions in level after an ON time TON proportional to (VOUT?VIN/VOUT has elapsed from assertion of the turn-on signal.

Abstract: A charging circuit can include: a first module having a plurality of power transistors, and being coupled between a first port and a reference ground; a second module having a plurality of power transistors, and being coupled between a second port and the reference ground; at least one inductor coupled between the first module and the second module; and where at least one of the first module and the second module forms a multi-level converter with the at least one inductor.

Abstract: The present disclosure describes a system with a first counter circuit, a first converter circuit, a second counter circuit, and a second converter circuit. The first counter circuit is configured to output a first count value based on a comparison between a first reference value and a switched node value of a voltage regulator. The first converter circuit is configured to adjust an activation time of the voltage regulator based on the first count value. The second counter circuit is configured to output a second count value based on a comparison between a second reference value and the switched node value of the voltage regulator. The second converter circuit is configured to adjust an amount of current drawn away from an output of the voltage regulator based on the second count value.

Abstract: An apparatus includes first and second pluralities of switches, a controller for controlling these switches, gate-drivers for driving switches from the first plurality of switches, and first and second terminals configured for coupling to corresponding first and second external circuits at corresponding first and second voltages. During operation, the controller causes the first plurality of switches to transition between states. These transitions result in the second voltage being maintained at a value that is a multiple of the first voltage. The controller also causes the second plurality of switches to transition between states. These transitions resulting in capacitors being coupled or decoupled from the second voltage. The gate drivers derive, from the capacitors, charge for causing a voltage that enables switches from the first plurality of switches to be driven.

Abstract: There is provided a method of controlling a plurality of converter cells in a phase arm of a modular multilevel converter (MMC) in accordance with a main reference. The method includes dividing the main reference into a plurality of reference parts, and, by using a grouping of the plurality of converter cells into a plurality of groups, operating a plurality of modulators in parallel, each modulator controlling a respective one of the groups of converter cells in accordance with one of the reference parts. A phase arm controlled in accordance with such a method is also provided, as well as an MMC including at least one such phase arm, and a converter station including at least one such MMC.

Abstract: A device for providing a bandgap voltage reference. The device comprises a first switching circuit for providing a first temperature voltage which behaves proportionally to a present temperature, wherein the first switching circuit has two parallel current paths, first and second diode elements being respectively arranged in first and second current paths of the parallel current paths, a second switching circuit for providing a second temperature voltage which behaves in a complementary manner relative to the present temperature, a control circuit which is designed to control a voltage difference between the parallel current paths of the first switching circuit, and a current-bias circuit which is designed to control a ratio of a flow of current through the first diode element to a flow of current through the second diode element, the current-bias circuit comprising a calibration circuit which sets the ratio to a target value.

Abstract: A power conversion device and a control circuit are provided. The power conversion device includes a power conversion circuit and a control circuit. The control circuit includes a first controller and a second controller. The power conversion circuit includes an input capacitor, a rectifier circuit, and a power switch. The input capacitor is coupled to an input terminal of the power conversion device. The rectifier circuit converts an input AC power into a rectified power. The first controller operates the power switch to cause the power conversion circuit to convert the rectified power into an output power. The second controller detects a signal waveform at the input terminal, and controls the first controller in response to the signal waveform at the input terminal, so as to utilize the power switch to discharge the charge stored in the input capacitor.

Abstract: A brushless motor is at least partially located in a hermetically sealed space. An electric work machine includes a brushless motor, an output unit, a motor case, a lead wire, and a first seal. The brushless motor includes a stator, a rotor rotatable with respect to the stator, and a rotor shaft fixed to the rotor. The output unit is drivable by the rotor shaft. The motor case includes an internal space and a wiring passage. The internal space accommodates the stator and the rotor. The lead wire is located in the wiring passage connecting the internal space and an external space of the motor case. The first seal seals between the lead wire and the motor case.

Abstract: A method of DC-DC power conversion includes converting a DC link voltage to a DC output voltage for a load that is lower than the DC link voltage using a buck converter. The method includes controlling the buck converter in a normal switching mode in response to the DC link voltage being below a predetermined high threshold. The method also includes controlling the buck converter in a rate limited switching mode in response to the DC link voltage being at or above the predetermined high threshold.

Abstract: A soft start module includes a power component, a current sensing component, a reference voltage generating circuit, and a constant current control circuit. The power component has a first terminal connected to a first node, a second terminal connected to an Output node, and a third terminal connected to a third node. The current sensing component has a fourth terminal connected to an input node and a fifth terminal connected to the first node. The reference voltage generating circuit has a seventh terminal connected to a fourth node and an eighth terminal connected to a ground node. The constant current control circuit has a ninth terminal connected directly or indirectly to the fifth terminal of the current sensing component, a tenth terminal connected the fourth node, and an eleventh terminal connected to the third node.

Abstract: The present document relates to a power converter. The power converter may be configured to convert an input voltage at the input of the power converter into an output voltage at an output of the power converter. The power converter may comprise a pass device, a feedback circuit, and a bypass circuit. The pass device may be coupled between the input of the power converter and the output of the power converter. The feedback circuit may be configured to generate, in a voltage regulation mode, a drive signal for driving a control terminal of the pass device. The bypass circuit may be configured to apply, in a bypass mode, a predetermined voltage to the control terminal of the pass device.

Abstract: A totem pole PFC (Power Factor Correction) circuit, having: a first switch, a second switch and a control circuit. When the totem pole PFC circuit works in CCM (Continuous Current Mode), the control circuit is configured to turn on a main switch when a current detecting signal indicative of an AC input current of the totem pole PFC circuit decreases to a current valley reference signal, and keep the main switch ON for a first on-time period. When the totem pole PFC circuit works in DCM (Discontinuous Current Mode), the control circuit is configured to turn on the main switch at a valley of a switching voltage after expiry of a time delay started from when the AC input current decreases to zero, and keep the main switch ON for a second on-time period.

Abstract: The present invention provides a controller, a switched-mode power supply and a method for controlling a switched-mode power supply. In response to a change of the switched-mode power supply from a continuous conduction mode to a discontinuous conduction mode, slope compensation is carried out with an output peak voltage raised by a compensating DC offset. Moreover, in response to a change of the switched-mode power supply from the discontinuous conduction mode to the continuous conduction mode, the compensating DC offset is subtracted from the peak voltage. In this way, an additional DC offset that would be introduced by a conventional slope compensation approach can be eliminated, maintaining a valley of a sampled feedback voltage constant both under steady load conditions and during load jumps.

Abstract: A flyback converter with improved over-voltage protection (OVP) functionality, which includes a primary winding arranged to receive an input voltage, a secondary winding coupled to the primary winding and connected to a rectifier circuit to generate DC output voltage, a primary side regulating controller, an auxiliary winding arranged to provide electric power to the primary side regulating controller, an external detection circuit connected between the auxiliary winding and the primary side regulating controller, an internal detection circuit arranged inside the primary side regulating controller and coupled to the external detection circuit by detecting the current value flowing through the external detection circuit and comparing it with a predetermined current value of the internal detection circuit to enable or disable an OVP circuit to protect the primary side regulating controller, and a switching device arranged to receive on/off signals generated for regulating current flowing through the primary win

Abstract: A switching module includes a substrate, a switching element, a first control part, a second control part, a first power part and a second power part. The switching element is disposed on the substrate. The switching element includes a first control terminal, a second control terminal, a first power terminal and a second power terminal. The first control part is connected with the first control terminal of the switching element. The second control part is connected with the second control terminal of the switching element. A projection area of the first control part on a reference plane intersects with a projection area of the second control part on the reference plane at one or more first intersections. The first power part is connected with the first power terminal of the switching element. The second power part is connected with the second power terminal of the switching element.

Abstract: A method for suppressing a narrow pulse is provided. The method is applied to a bridge switch circuit having at least one bridge arm which has an upper switch transistor and a lower switch transistor, and includes: detecting whether an original comparison value of a modulated wave in a current cycle is in a preset narrow pulse interval of the upper switch transistor, and if so, determining an adjustment interval of the upper switch transistor to which the original comparison value of the modulated wave currently pertains; and adjusting the original comparison value of the modulated wave to an adjusted comparison value of the modulated wave corresponding to the adjustment interval of the upper switch transistor to which the original comparison value of the modulated wave currently pertains according to a corresponding relationship between adjustment intervals of the upper switch transistor and adjusted comparison values of the modulated wave.