47 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.

The invention discloses a cardiac pacemaker, characterized in that the cardiac pacemaker 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 cardiac pacemaker comprises an interposer layer comprising holes for the multiple of microneedles and a lid. The cardiac pacemaker 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, each microneedle of the array of microneedles has a distal end which protrudes from the chip and the cardiac pacemaker 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.

The invention relates to a circuit arrangement for supplying power to a gate driver (4) of a transistor (2), comprising a first input (32) which is connected or connectable to a drain terminal (22) of the transistor, a second input (34) which is connected or connectable to a source terminal (24) of the transistor, a first output (36) which is connected or connectable to a first voltage supply terminal (40) of the gate driver, and a second output (38) which is connected or connectable to a second voltage supply terminal (42) of the gate driver, and comprising a coupling capacitor (6) which is connected to the first input (32);a first diode (8) and a first buffer capacitor (10) connected in series between the coupling capacitor (6) and the second input (34), wherein the first diode allows current flow from the coupling capacitor to the first buffer capacitor, and wherein the first output (36) is connected between the first diode (8) and the first buffer capacitor (10); and a second buffer capacitor (14) and a second diode (16) connected in series between the second input (34) and the coupling capacitor (6), wherein the second diode allows current flow from the second buffer capacitor to the coupling capacitor, and wherein the second output (36) is connected between the second buffer capacitor (14) and the second diode (16).

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.

The invention relates to an intelligent electronic switch. Accordingly, a smart switchgear is described herein. In one embodiment, an apparatus includes a first supply circuit configured to provide a first voltage at a first output node based on a first supply voltage; a second power supply circuit configured to provide a second voltage at a second output node based on a second power supply voltage; and a power management unit configured to provide a third voltage at a third output node based on both the first supply voltage and the second supply voltage. The first output node, the second output node, and the third output node are coupled to the snubber capacitor. The device also includes a wake-up circuit configured to detect a wake-up event, and further configured to enable the power management unit upon detection of the wake-up event.

A power electronics system (1) for supplying an electric machine (100), preferably a motor vehicle (101), is proposed, wherein the power electronics system (1) comprises an n-phase resonant inverter (2), the resonant inverter (2) comprising a first semiconductor switch (3) and a second semiconductor switch (4) per phase, the resonant inverter (2) comprising a plurality of first snubber capacitors (5) and a plurality of second snubber capacitors (6), wherein the first snubber capacitors (5) can be selectively connected in parallel with the first semiconductor switch (3) and the second snubber capacitors (6) can be selectively connected in parallel with the first semiconductor switch (4). Furthermore, a method for operating a power electronics system (1) and a motor vehicle (101) are proposed.

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.

This invention provides an electric motor drive device. It enables an easy-to-construct, compact, and low-cost electric motor drive device that reduces heat loss from both the smoothing capacitor and the buffer capacitor. The electric motor drive device includes: a smoothing capacitor section having at least one smoothing capacitor disposed between a converter circuit and an inverter circuit within a power conversion circuit that generates drive power for the electric motor; a buffer capacitor that suppresses surge voltages of power elements constituting part of the power conversion circuit; and a support plate for housing the smoothing capacitor section, wherein the electrode terminals of the smoothing capacitor section and the electrode terminals of the buffer capacitor are disposed close to each other across the support plate, the positive terminal of the smoothing capacitor section is electrically connected to the positive terminal of the buffer capacitor, and the negative terminal of the smoothing capacitor section is electrically connected to the negative terminal of the buffer capacitor.

Provided is a snubber circuit. The snubber circuit may include a first snubber diode connected to a first node connected to a DC-DC converter, a snubber capacitor connected between the first snubber diode and a second node connected to the DC-DC converter, a snubber voltage source connected to the first node, a snubber inductor connected to a third node between the first snubber diode and the snubber capacitor, and a second snubber diode connected between the snubber inductor and the snubber voltage source.

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.

Device (100) for intelligent grid power regulation by means of capacitive energy storage, wherein the device (100) is designed to supply at least one electric drive (150) with electrical energy from a power supply network (110), wherein the device (100) has the following features: - a buffer capacity (220); - a DC intermediate circuit (140, 210) configured to be coupled to the buffer capacitor (220) via a first interface (200a) or which is coupled to the buffer capacitor via the first interface; and - a second interface (200b) via which the DC link (140, 210) can be coupled or connected to the power supply network (110), wherein the second interface (200b) is designed to limit a current flow between the power supply network (110) and the DC link (140, 210) when the voltage in the DC link (140, 210) has a value that is within a set voltage range (U) DC,min - U DC,max ) lies, characterized in that the second interface (200b) is further configured to dynamically increase the current flow between the power supply network (110) and the DC intermediate circuit (140, 210) to the current limit allowed between the power supply network (110) and the DC intermediate circuit (140, 210), if a voltage level of the voltage in the DC intermediate circuit (140, 210) is outside the nominal voltage range (UDC,min - You DC,max ) lies.

A power converter for converting an input to an output for driving a load, said power converter comprising a switched mode power supply, SMPS, arranged for receiving an input and for converting said input to an output for driving said load, a buffer capacitor connected in a parallel branch across said load and arranged for buffering said output from said SMPS, a charge circuit, separate from said SMPS, and arranged for providing a charge current to said buffer capacitor until a voltage over said buffer capacitor exceeds a voltage threshold.

Accordingly, an intelligent switching device is described herein. In one embodiment, the device includes a first supply circuit configured to provide a first voltage at a first output node based on a first supply voltage; a second supply circuit configured to provide a second voltage at a second output node based on a second supply voltage; and a power management unit configured to provide a third voltage at a third output node based on both the first supply voltage and the second supply voltage. The first, second, and third output nodes are coupled to a buffer capacitor.The device further includes a wake-up circuit configured to detect a wake-up event and further configured to activate the power management unit when it detects a wake-up event.

An active voltage snubber includes a ground terminal and an input terminal, and a snubber capacitor. A snubbing-activation device is designed to connect the input terminal to a second terminal of the snubber capacitor with a view to charging the snubber capacitor via this second terminal. Also included is a discharging switch for discharging the snubber capacitor, and a control circuit for controlling the discharging switch, which is designed to close the discharging switch so as to make the snubber capacitor discharge via its second terminal through the discharging switch. The control circuit is powered electrically by the snubber capacitor by being connected to the second terminal of the snubber capacitor so as to receive current from the snubber capacitor.

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

A power switching assembly includes a first driver circuit and a second driver circuit. The first driver circuit is supplied via a first internal supply node and a first reference node and drives a first gate signal. The second driver circuit is supplied via a second internal supply node and a second reference node and drives a second gate signal. The first gate signal and the second gate signal are configured to be in phase with each other. The first reference node and the second reference node are separated. A first buffer capacitor is electrically connected between the first internal supply node and the first reference node. A second buffer capacitor electrically connected between the second internal supply node and the second reference node.

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

The invention relates to a device for stabilizing an on-board electrical system voltage in an on-board electrical system (10) of a vehicle, comprising a first energy store (22), a bidirectional DC transformer (24), a series circuit and an on-board electrical system connection (A) for connection to the on-board electrical system (10). The series circuit includes a current measurement component (27) and a snubber capacitor (28). The bidirectional DC-DC converter (24) is connected to the first energy store (22) by means of a first DCDC connection and to the on-board electrical system connection (A) by means of a second DCDC connection. The current measuring arrangement (27) is designed to provide a first measuring signal for the control unit (25), which first measuring signal represents the current flowing in the series circuit, and the DC transformer (24) is designed to operate in a buck converter mode or in a boost converter mode in dependence on a control signal provided by the control unit (25) depending on the first measuring signal.

An electric pulse fragmentation device and method are provided, the device comprising a pulse transformer, one or more buffer capacitors, a plurality of IGBT modules, a storage capacitor, a spark gap, and a fragmentation chamber, the spark gap being defined by spark gap first and second electrodes, the fragmentation chamber comprising fragmentation chamber first and second electrodes. The buffer capacitors are electrically connected to a voltage rectifier. The buffer capacitors are charged by electrical current received from the voltage rectifier. The IGBT modules control partial discharge of the buffer capacitors to permit and restrict current flow from the buffer capacitor to transformer primary windings for a duration of a control pulse. The storage capacitor is charged by electrical current from transformer secondary windings. The storage capacitor is adapted to discharge current across the spark gap to the fragmentation chamber electrodes. Raw material positioned between fragmentation electrodes can be fractured.

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).