83 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 subject of the invention is capacitor health diagnosis. A capacitor health diagnostic circuit is provided that is configured to run a diagnostic test to determine a capacity of the at least one snubber capacitor. The diagnostic test includes a multi-stage discharge test performed under varying current conditions to determine a leakage current of the at least one capacitor and determine a capacitance of the at least one capacitor based at least in part on the determined leakage current.

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.

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

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.

An induction heating hob (1) comprising an induction load (3) and a power converter (100) which is configured to provide an electric power to the induction load (3). The power converter (100) comprises a converter circuit (8), and a converter control module (9) which controls the converter circuit (8) for regulating the electric power supplied to the induction load (3). The converter circuit (8) comprises a switching circuit which is provided with a couple of converter switches (11)(12) which are connected in series to each other by a first node (17) connected to a first terminal of the induction load (3) by a converter line (24). The converter circuit (8) further comprises a snubber circuit (38) which is provided with a couple of snubber capacitors (21)(22) which are connected in series to each other by a second node (23) connected to the converter line (24), and a couple of damping circuits (25)(26), which are connected both in parallel to the snubber capacitors (21)(22) and to the converter switches (11)(12), respectively.

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 switching power supply includes a power converter having a transformer, a low-side switch and a high-side switch, wherein the low-side switch is configured to draw current from a power supply voltage through a primary winding of the transformer, and the high-side switch is configured to couple the primary winding of the transformer to a buffer capacitor. A controller is configured to synchronously control the opening and closing of the low-side switch and the high-side switch, wherein the low-side switch and the high-side switch are repeatedly opened and closed in a series of switching cycles, respectively, to form an adjusted output voltage. A first voltage is generated at a node between the low-side switch and the high-side switch. The controller is also configured to disconnect the high-side switch when the first voltage drops to a determined level during each switching cycle. The determined level is higher than the power supply voltage by an amount adjusted according to the level of the monitored power supply voltage.

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.

A switching power supply comprises a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to couple the primary winding of the transformer to a snubber capacitor. A controller is configured to synchronously control the opening and closing of the low side switch and the high side switch so as to form a regulated output voltage. A first voltage is generated at a node between the low side switch and the high side switch. The controller is further configured to open the high side switch during each switching cycle when the first voltage reaches a determined level. The determined level is higher than the supply voltage by an amount that is adjusted dependent on a monitored level of the supply voltage.

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.

An induction heating hob (1) comprising an induction load (3) and a power converter (100) which is configured to provide an electric power to the induction load (3). The power converter (100) comprises a converter circuit (8), and a converter control module (9) which controls the converter circuit (8) for regulating the electric power supplied to the induction load (3). The converter circuit (8) comprises a switching circuit which is provided with a couple of converter switches (11)(12) which are connected in series to each other by a first node (17) connected to a first terminal of the induction load (3) by a converter line (24). The converter circuit (8) further comprises a snubber circuit (38) which is provided with a couple of snubber capacitors (21)(22) which are connected in series to each other by a second node (23) connected to the converter line (24), and a couple of damping circuits (25)(26), which are connected both in parallel to the snubber capacitors (21)(22) and to the converter switches (11)(12), respectively.

The invention relates to a charging device (200), in particular for a vehicle, comprising a converter circuit (250) and a direct voltage output (220). For each phase (L1, L2, L3) of the input connection unit (210), the converter circuit (250) comprises an alternating voltage input (330, 430, 530) on the input side, and the converter circuit (250) is connected to the direct voltage output (220) on the output side. The charging device (200) comprises a changeover switching element (520) which is connected to a third alternating voltage input (530) of the converter circuit (250) and is designed to either connect the third alternating voltage input (530) of the converter circuit (250) to the corresponding third phase (L3) of the input connection unit (210) or connect the third alternating voltage input (530) of the converter circuit (250) to a buffer capacitor (540), wherein the charging device (200) comprises the buffer capacitor (540) on the input side of the converter circuit (250), said buffer capacitor being connected to the switchable contact of the changeover switching element (520) and to a ground potential (N).

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.

An apparatus comprises a power source connected to a buffer capacitor. The apparatus comprises a first switch connected between the buffer capacitor and a driven switch. The buffer capacitor is charged by the power source when the first switch is turned off. The apparatus comprises a comparator. The comparator monitors the charging of the buffer capacitor. In response to the buffer capacitor reaching a threshold amount of charge, the comparator turns on the first switch to initiate a charge redistribution of charge from the buffer capacitor to the driven switch.

Disclosed are a metallized film for a buffer capacitor and a method for preparing the same. The method comprises: providing an organic plastic film as a dielectric film; depositing a metallized layer on the dielectric film to obtain a metallized film; and cutting the metallized film into predetermined dimensions. In this manner, the metallized film for the buffer capacitor is produced.

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.

A liquid crystal display apparatus has a three-TFT structure in which each of pixels includes a first liquid crystal capacitor including a first pixel electrode, a second liquid crystal capacitor including a second pixel electrode, a first TFT including a drain electrode connected to the first pixel electrode, a second TFT including a drain electrode connected to the second pixel electrode, and a buffer capacitor including a buffer capacitor electrode connected to the second pixel electrode via a third TFT. In the liquid crystal display apparatus, a configuration is adopted in which a gate scanning signal is independently supplied to a plurality of gate bus lines one by one, and a sub-gate-on pulse is substantially simultaneously applied to the third TFTs belonging to at least two pixel rows.

A power converter for compensating voltage variation in a circuit, the circuit comprising: a power stage arranged for receiving a mains input and for converting the mains input into a direct current, DC, output for driving a load; and a first buffer capacitor connected in a parallel branch with the load; wherein the power converter comprises an output capacitor connected in series with the first buffer capacitor, wherein the output capacitor is arranged for connecting in series with the first buffer capacitor in said parallel branch with the load; wherein the power converter comprises a second buffer capacitor arranged for connecting in series with the first buffer capacitor; and wherein the power converter is configured to charge the output capacitor from the second buffer capacitor, when the DC output is below a predetermined threshold.

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.

In a power converter, a first current loop includes a first snubber capacitor, a first high-side switch, and a first low-side switch, and a second current loop includes a second snubber capacitor, a second high-side switch, and a second low-side switch. In a plan view in a direction perpendicular or substantially perpendicular to a substrate, third low-potential wiring defining a portion of the second power line is located between the first current loop and the second current loop. A direction of current flowing through the first current loop is opposite to a direction of current flowing through the second current loop.

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.

The invention relates to a circuit arrangement for discharging at least one energy storage device (ES) charged to a high voltage in a motor vehicle, comprising: a discharge circuit (RD, TD; DC‑DC1, DC‑DC2) connected in parallel with the energy storage device (ES); an auxiliary microcontroller (MC1) for controlling the discharge circuit (RD, TD; DC‑DC1, DC‑DC2), the auxiliary microcontroller being capable of operating with a low voltage of 3‑5 volts; a first voltage supply circuit (SV1) for supplying the auxiliary microcontroller (MC1) with a low voltage of 3‑5 volts, the first voltage supply circuit being supplied with a voltage of 10‑15 volts by a buffer capacitor (C_Puffer); and a main microcontroller (MC2), the main microcontroller being configured to control the auxiliary microcontroller (MC1) for controlling the discharge circuit (RD, TD; DC‑DC1, DC‑DC2).

The device (7) for stabilizing a voltage supply in an on-board electrical system of a vehicle comprises a first connection (T1) for direct or indirect connection to an energy source (3) and a second connection (T2) for direct or indirect connection to at least one load (5) of the on-board electrical system. The device (7) also comprises a first buffer capacitor (CP1) which is arranged in a first branch (B1) which is connected to the second connection (T2) and a reference potential. The device (7) comprises a buffer capacitor arrangement (11) having at least two capacitors (C1, C2) and a switchover apparatus having a plurality of controllable switches (S1, S2, S3). The buffer capacitor arrangement is arranged in parallel with the first buffer capacitor (CP1) and, when the switchover apparatus is in a first switching state, the at least two capacitors (C1, C2) are arranged in series and, when the switchover apparatus is in a second switching state, the at least two capacitors (C1, C2) are arranged in parallel branches. The device (7) also comprises a current sensor and a voltage sensor.

The invention relates to a power-off circuit system. A power-off circuitry for a controller of a process control system is provided. The power-off circuitry comprises: at least one snubber capacitor for buffering sufficient energy to complete a power-off sequence; a power voter configured to select at least one snubber capacitor as an energy source in response to detection of a power failure; a non-volatile memory for holding process data after the detection of the power failure; and logic circuitry configured to coordinate transfer of process data to the non-volatile memory during the power down sequence.