27 results about "Snubber capacitor" patented technology

The invention discloses a neural tissue stimulator, characterized in that the neural tissue stimulator comprises a multiple of microneedles and a chip comprising at least one comparator with adaptive level, sequence control circuit, at least one capacitor stack built by n capacitors and 2n switches, at least one buffer capacitor outside the at least one capacitor stack, at least two additional switches outside the at least one capacitor stack, a CMOS-Logic, wherein further, the neural tissue stimulator comprises an interposer layer comprising holes for the multiple of microneedles and a lid. The neural tissue stimulator is characterized in, that the chip is located on one surface of the interposer layer and that the lid and the interposer layer form a capsule for the chip. Further, the neural tissue stimulator is adapted to be electrically self-sufficient.

Provided is a technique for preventing an inrush current from flowing through a snubber capacitor. A dual inverter system for an open winding motor includes: a motor; a first inverter and a second inverter; a positive electrode switching circuit and a negative electrode switching circuit disposed between the second inverter and the battery; and a control device capable of switching a driving mode of the motor between a single mode in which the two switching circuits are turned off and only the first inverter is switched, and a dual mode in which the two switching circuits are turned on and the first inverter and the second inverter are switched. The second inverter has a snubber circuit that electrically connects the positive electrode terminal and the negative electrode terminal and is provided with a snubber capacitor, and when the driving mode of the motor is switched from a single mode to a dual mode, the control device closes only the negative electrode switching circuit in a state in which the positive electrode switching circuit is kept open and only closes the negative electrode switching circuit in a state in which the positive electrode switching circuit is kept open. Therefore, the buffer capacitor is pre-charged.

The invention relates to a capacitive energy store (108) for a piece of embedded equipment (100), comprising: a succession of storage capacitors (3, 4, 5, 6) that are connected in parallel and that each have a capacitance less than 25,000 μF; a buffer capacitor (2) of lower capacitance; a switch (20) for connecting / disconnecting the buffer capacitor to / from a power supply (102) of the equipment; switches (30, 40, 50, 60) for connecting / disconnecting each storage capacitor to / from the preceding capacitor; a sequencer (8), configured to measure the voltage across the terminals of the buffer capacitor and of the storage capacitors and, when the equipment is switched on, control the various switches according to an initial charging process comprising a succession of cycles of charging / discharging the buffer capacitor (2) into the succession of storage capacitors.

Systems and methods for operating an electromechanical lock are described herein. According to one embodiment, the method includes harvesting ambient energy using an energy harvesting circuit and charging a buffer capacitor using the harvested ambient energy. The method also includes alternately connecting and disconnecting an electrical load and the buffer capacitor, wherein a capacitor voltage provided by the buffer capacitor during a discharge phase is applied to the electrical load, during which the electrical load is connected to the buffer capacitor and the capacitor voltage decreases, and wherein the buffer capacitor is recharged during a charging phase, during which the electrical load is disconnected from the buffer capacitor, during which the capacitor voltage increases again. The duration of the charging phase and the discharge phase are designed such that the capacitor voltage remains above a minimum supply voltage of the electrical load.

A bidirectional circuit breaker has Breaking Speed Control (BSC) to prevent false triggering when an upstream fault occurs. A semiconductor switch has a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and a varistor in three parallel branches that drive a positive output. An input capacitor between positive and negative inputs forms an LC network with an inductor connected to the positive input. A current sensor is connected between the inductor and the semiconductor switch. When the current sensor detects reverse current, a snubber switch is closed, connecting a snubber capacitor across both terminals of the inductor. A LCC network is formed that stores more energy than the LC network, spreading out a current spike caused by the upstream fault, reducing peak reverse current pulled through the circuit breaker by the upstream fault. Thus breaking speed is reduced when the snubber switch closes.

An interface control for a powered device (PD) is provided, including a switch and a control circuit. The switch controls the current to a PD from a power supply unit (PSE). The PD draws power from a network cable carrying data, and the PSE supplies power to the network cable. The PD also draws power from an auxiliary power source. The control circuit detects a switchover from the auxiliary power source to the PSE as the power source. The control circuit turns on the switch to control the current to a short-circuit current limit, greater than the PD's inrush current limit, for a duration less than the short-circuit time limit, to charge a buffer capacitor in the PD. The control circuit then fully turns on the switch to allow current to flow to the PD.

A method for controlling a converter unit for an electric machine of a vehicle. The converter unit includes an electric power source interface, an electric machine interface, at least one H-bridge and at least one snubber capacitor. The H-bridge and the at least one snubber capacitor are electrically interposed between the electric power source interface and the electric machine interface. A switch is provided on each leg of the H-bridge. The method includes causing closure of a pair of switches for supplying electric current to the electric machine interface during a first predefined time span. The method further includes causing closure of the pair of switches for supplying an electric induction current to the electric machine interface during a second predefined time span and after a predefined waiting time. The first predefined time span and the second predefined time span are associated with the same electric current supply half cycle.

A bidirectional circuit breaker has Breaking Speed Control to prevent false triggering when an upstream fault occurs. A semiconductor switch has a Metal Oxide Semiconductor Field Effect Transistor (22), an Insulated Gate Bipolar Transistor (24), and a varistor (30) in three parallel branches that drive a positive output. An input capacitor (36) between positive and negative inputs forms an LC network with an inductor (42) connected to the positive input. A current sensor (40) is connected between the inductor (42) and the semiconductor switch. When the current sensor (40) detects reverse current, a snubber switch (32) is closed, connecting a snubber capacitor (34) across both terminals of the inductor (42). A LCC network is formed that stores more energy than the LC network, spreading out a current spike caused by the upstream fault, reducing peak reverse current pulled through the circuit breaker by the upstream fault. Thus breaking speed is reduced when the snubber switch (32) closes.

In one implementation, a gate drive unit includes a high rail and a low rail configured to be coupled to input dc voltage; an intermediate rail configured to be coupled to a main terminal of a power switch; a linear voltage regulator coupled to either the high rail or the low rail, wherein the linear voltage regulator is configured to output a regulated voltage; a buffer capacitor coupled between the output of the linear voltage regulator and the intermediate rail; and a switch that is configured to couple the output of the linear voltage regulator to a control terminal of the power switch, thereby driving the power switch into or out of conduction.

A busbar device, a corresponding intermediate circuit capacitor apparatus and a motor vehicle equipped therewith are provided. The busbar device has electrical contact elements, each forming a contact surface region in which they extend parallel to one another in a planar manner. On at least one end thereof each of the contact elements has a connection region as an outer connection. The contact elements form a snubber capacitor. For this purpose the contact surface regions are spaced apart from one another, perpendicularly to their main extension plane, only by an electrical insulation layer. Moreover, the contact surface regions extend, in the directions which span their main extension plane, over the majority of a total extent of the busbar device. The height of the busbar device perpendicularly to the main extension plane of the contact surface regions is less than the extent thereof in this main extension plane.

The invention relates to a method, a device and a medium for controlling a converter unit of a vehicle. The converter unit includes a power interface, a motor interface, at least one H-bridge, and at least one snubber capacitor. The H-bridge and the at least one snubber capacitor are electrically interposed between the power interface and the motor interface. A switch is disposed on each branch of the H-bridge. The method includes closing a pair of switches for supplying current to the motor interface during a first predetermined time span. The method further includes, during a second predetermined time span and after the predetermined latency, closing the pair of switches to supply an induced current to the motor interface. The first predetermined time span and the second predetermined time span are associated with the same current supply half cycle. In addition, the present disclosure relates to a data processing device, a computer program, and a computer-readable storage medium.

A circuit arrangement discharges at least one energy store charged to a high voltage in a motor vehicle. The circuit arrangement includes a discharge circuit which is connected in parallel with the energy store and contains an auxiliary microcontroller for actuating the discharge circuit. The auxiliary microcontroller can be operated with a low voltage of 3-5 volts and contains a first voltage supply circuit for supplying the auxiliary microcontroller with the low voltage of 3-5 volts, which first voltage supply circuit is fed from a buffer capacitor with a voltage of 10-15 volts. The circuit arrangement further contains a main microcontroller, which is configured to actuate the auxiliary microcontroller so that the latter actuates the discharge circuit.

To provide a technique for preventing a rush current from flowing through a snubber capacitor.SOLUTION: A dual inverter system for an open-winding motor includes a motor, first and second inverters, positive and negative switch circuits disposed between the second inverter and a battery, and a control device capable of switching a drive mode of the motor between a single mode in which the two switch circuits are opened and only the first inverter is subjected to switching control and a dual mode in which the two switch circuits are closed and the first and second inverters are subjected to switching control. When the drive mode of the motor is switched from the single mode to the dual mode, the control device performs precharging of the snubber capacitor by closing only the negative electrode switch circuit in a state where the positive electrode switch circuit is opened.SELECTED DRAWING: Figure 3

It suppresses voltage surges and voltage noise during switching. [Solution] The nitride semiconductor device 10 includes a conductive substrate 11, a nitride semiconductor layer 15 located on the conductive substrate 11, a transistor 100 that includes a part of the nitride semiconductor layer 15 and has a gate electrode 24, a source electrode 28, and a drain electrode 30 located on the nitride semiconductor layer 15, and a snubber circuit 200 connected in parallel to the source electrode 28 and the drain electrode 30. The conductive substrate 11 is electrically connected to the source electrode 28. The snubber circuit 200 includes a snubber resistor 201 located on the nitride semiconductor layer 15 and electrically connected to the drain electrode 30, and a snubber capacitor 210 electrically connected to the snubber resistor 201 and the conductive substrate 11 and including parasitic capacitance formed by the nitride semiconductor layer 15.

A capacitive energy reserve (108) for an onboard device (100) comprises: a series of reserve capacitors (3, 4, 5, 6) connected in parallel, each having a capacitance of less than 25,000 µF; a buffer capacitor (2) of lower capacitance; a switch (20) for connecting / disconnecting the buffer capacitor from a power supply (102) to the device; switches (30, 40, 50, 60) for connecting / disconnecting each reserve capacitor from the preceding capacitor; and a sequencer (8) configured to measure the voltage across the buffer capacitor and the reserve capacitors and, upon power-up of the device, to control the various switches according to an initial charging process comprising a series of charge / discharge cycles of the buffer capacitor (2) through the series of reserve capacitors. Figure for the abstract: Fig. 1

A charger (200), in particular for a vehicle, has a conversion circuit (250) and a DC voltage output (220), which, for each phase (L1, L2, L3) of an input connection unit (210), comprises an AC voltage input (330, 430, 530) on the input side, and is connected on the output side to the DC voltage output (220). The charger (200) comprises a switching switch element (520), which is connected on the one hand to a third AC voltage input (530) of the conversion circuit (250) and is designed to connect the third AC voltage input (530) of the conversion circuit (250) either to a third phase (L3) of the input connection unit (210) associated therewith or to a buffer capacitor (540), wherein the charger (200) comprises the buffer capacitor (540) on the input side of the conversion circuit (250), which is connected on the one hand to a switchable contact of the switching switch element (520) and on the other hand to a ground potential (N).

This power conversion device comprises a first rectifier circuit, a first snubber circuit, a second rectifier circuit, a second snubber circuit, and a control unit. The first snubber circuit has a first snubber capacitor and a first snubber switch. The second snubber circuit has a second snubber capacitor and a second snubber switch. The control unit controls the first snubber switch and the second snubber switch so that the first snubber switch and the second snubber switch are periodically turned on and off in synchronization repeatedly regardless of the inter-terminal voltage of the first snubber capacitor and the inter-terminal voltage of the second snubber capacitor.

This application discloses a stage circuit, a display device, and an electronic device including the display device. The stage circuit includes: a first input terminal configured to receive a clock signal; a second input terminal configured to receive a drive signal; an output terminal configured to output a carry signal; an input circuit configured to transmit the drive signal to a first node in response to the clock signal; a voltage control circuit configured to control the voltage of a first control node and the voltage of a second control node in response to the drive signal transmitted to the first node; and a carry driver circuit including a boost capacitor connected between the first control node and the output terminal and a buffer capacitor configured to maintain the voltage of the output terminal.

In a power semiconductor module including a snubber capacitor, the power semiconductor module capable of achieving both a high current density and prevention of heating of the snubber capacitor is provided. The power semiconductor module includes: a positive electrode terminal; a negative electrode terminal of which at least a part is disposed to overlap the positive electrode terminal in a plan view; a first wiring branching from the positive electrode terminal; a second wiring branching from the negative electrode terminal; and a snubber capacitor disposed outside of a position at which the positive electrode terminal and the negative terminal overlap each other in the plan view and connected through the first wiring and the second wiring.

The invention relates to a quick start-up circuit and method for a self-powered single stage driver with a large energy storage snubber capacitor. An auxiliary winding for supplying power to a controller on the primary side of the transformer may include a tap winding and a selector for selecting an appropriate winding for supplying power to the controller. During an initial charging phase of the output capacitor in the start-up phase, a voltage supply capacitor of the controller is connected to the enlarged auxiliary winding, thereby applying a higher voltage to the voltage supply capacitor. Once the supply voltage reaches a maximum level, the selector switches to the tap, reducing the connected voltage.

An induction heating cooker (1) includes an induction load (3) and a power converter (100) configured to supply electrical power to the induction load (3). The power converter (100) includes a converter circuit (8) and a converter control module (9) that controls the converter circuit (8) to regulate the electrical power supplied to the induction load (3). The converter circuit (8) includes a switching circuit with a pair of converter switches (11) (12) connected in series with each other via a first node (17), which is connected to a first terminal of the induction load (3) via a converter line (24). The converter circuit (8) further includes a buffer circuit (38) having a pair of buffer capacitors (21) (22) connected in series with each other via a second node (23) connected to the converter line (24), and a pair of damping circuits (25) (26) connected in parallel with both the buffer capacitors (21) (22) and the converter switch (11) (12).

A low voltage power stage of a DC-DC converter includes a plurality of switching transistors coupled in parallel with each other associated with a DC voltage. The low voltage power stage also includes a plurality of snubber capacitors having mixed capacitance values coupled in parallel to different switching transistors.

A system (10) including an energy harvesting circuit (12) connectable to an antenna (14) and configured to execute an autonomous matching procedure to match the antenna (14) to an electric load (15), a buffer capacitor (16) connected to the energy harvesting circuit (14) and chargeable by the energy harvesting circuit (14), and a control circuit (20) connected to the energy harvesting circuit (14) and to the buffer capacitor (16) and connectable to the electric load (15), wherein the control circuit (20) is configured to control a supply voltage of the electric load (15), and wherein the control circuit (20) comprises an auxiliary capacitor (22) chargeable during execution of the autonomous matching procedure.

The invention relates to the technical field of inverters, and provides an ANPC type inverter and a control method thereof, and the inverter comprises an upper bridge arm switch tube, a lower bridge arm switch tube, an absorption capacitor, a clamping switch tube and a controller. According to the invention, the commutation path of the upper and lower bridge arm switch tubes is reduced through the absorption capacitor, the stray inductance and the voltage peak generated during high-frequency switching are reduced, the absorption capacitor is pre-charged in the process of pre-charging the bus capacitor at the direct current side, the pre-charging of the absorption capacitor is realized by using the existing switch tubes in the topology, and the pre-charging efficiency is improved. And an additional pre-charging hardware circuit is reduced. According to the invention, the overvoltage phenomenon of a switching device on the bridge arm during zero-crossing switching can be avoided, the short circuit, overvoltage and rapid charging and discharging phenomena of an absorption capacitor can be avoided, in addition, during zero-crossing switching, the switching state of only one switching tube is changed at the same time, and the switching efficiency is improved. The switching state of short circuit of the absorption capacitor caused by simultaneous conduction of the upper bridge arm switching tube and the lower bridge arm switching tube and simultaneous conduction of the two clamping switches is eliminated.

The utility model relates to a welding positioning tool of a buffer capacitor, which comprises a soldering lug bottom plate, an element bottom plate, an element limiting block, a spring baffle plate, a soldering lug pressing plate and a pull rod, one end of the element bottom plate is connected with one end of the soldering lug bottom plate, the height of the element bottom plate is higher than that of the soldering lug bottom plate, and the other end of the soldering lug bottom plate is provided with the spring baffle plate. The other end of the element bottom plate is provided with an element limiting block, the soldering lug bottom plate is provided with a first soldering lug clamping groove, the element bottom plate is provided with a second soldering lug clamping groove, the soldering lug pressing plate is arranged on the soldering lug bottom plate in a sliding mode, the pull rod is connected with the soldering lug pressing plate and penetrates through the spring baffle, and the spring is arranged between the soldering lug pressing plate and the spring baffle. A heightening block is arranged on the surface of the element bottom plate and located at one end of the element bottom plate. The positioning device is simple in structure, convenient to use, accurate in positioning and high in production and manufacturing efficiency. The soldering lug is positioned through the height difference between the soldering lug bottom plate and the element bottom plate and the soldering lug clamping groove, and the capacitor element is positioned through the element limiting block and the heightening block.

The invention relates to a power supply, a controller for the power supply and a method for controlling the power supply. The disclosed concept relates to a power supply including a power ripple buffer (PPB). A power supply includes a power factor correction (PFC) stage including a DC link capacitor and an unregulated DC-DC converter that receives a DC link voltage across the DC link capacitor and generates an output voltage. The PPB is connected between the PFC stage and the unregulated DC-DC converter, and includes a snubber capacitor. The PFC stage is configured to regulate a voltage across the snubber capacitor, and the PPB is configured to regulate a DC link voltage across the DC link capacitor. As a result, the voltage across the DC link capacitor may be maintained at a near constant value, while the voltage across the buffer capacitor varies. This means that the DC-DC converter may be unregulated, efficient, and highly compact because the input voltage is tightly regulated.