Abstract: A switching converter controller includes an on-time timer circuit coupled to a switch driver circuit. The on-time timer circuit includes an up/down counter with a clock input node. The on-time timer circuit also includes a latch with an input coupled to an external clock signal and with an output coupled to the clock input node. The on-time timer circuit also includes an on-time capacitor array with a control terminal coupled an output of the up/down counter.
Abstract: A power controller for use in a PFC power converter is capable being immune from audible noise during the test of load transient response. A transconductor with a transconductance compares an output voltage of the PFC power converter with a target voltage to provide a compensation current, which builds up a compensation voltage. An ON-time controller is configured to end an ON time of a power switch in response to the compensation voltage. An OFF-time controller is configured to end an OFF time of the power switch. A compensation-voltage designator presets the compensation voltage. A status detector controls the transconductor, the ON-time controller, the OFF-time controller, and the compensation-voltage designator, in response to the output voltage, a top-boundary voltage and a bottom-boundary voltage.
Abstract: A power converter, comprising an energy transfer element, an output of the power converter, a power switch, an active clamp circuit, and a first controller. The active clamp circuit comprising a capacitance, a steering diode network coupled to the capacitance and configured to transfer a charge to the capacitance, a clamp switch coupled to the capacitance and configured to transfer the charge stored in the capacitance to the energy transfer element, and an offset element coupled to the clamp switch and configured to provide a path to discharge a capacitance associated with the clamp switch. The first controller configured to output a clamp drive signal to control the turn on and turn off of the clamp switch and a primary drive signal to control the turn on and turn off of the power switch.
Abstract: A bandgap reference circuit and a method for providing a reference voltage are disclosed. In an embodiment a bandgap reference circuit includes a voltage generator including a first branch and a second branch and being configured to produce a reference voltage with a temperature coefficient lower than a given threshold, a supply circuit configured to provide a first current to the first branch and a second current to the second branch, and a control loop including a transconductance amplifier configured to provide an output signal representative of a difference between a first voltage of the first branch and a second voltage of the second branch and a filter coupled to an output of the transconductance amplifier, the filter configured to provide an output signal for controlling the first current and second current of the supply circuit.
Abstract: An electrostatic chuck includes a base having a support surface configured to retain a retaining target by electrostatic retention, and a thermocouple configured to detect a temperature of the base. The thermocouple includes first and second metal parts provided inside the base and having ends connected to each other to form a measuring junction, a first wire part having one end connected to the other end of the first metal part inside the base, and another end extending outside the base, and a second wire part having one end connected to the other end of the second metal part inside the base, and another end extending outside the base. The first metal part and the first wire part are formed from a first material, and the second metal part and the second wire part are formed from a second material different from the first material.
Abstract: A battery protection system with a voltage sensing circuit for sensing the voltage of a battery and disconnecting all loads from the battery, including the voltage sensing circuit itself, when the voltage of the battery drops below a preset limit or when a battery charger is connected to the battery. The battery protection system reconnects the voltage sensing circuit upon disconnection of the battery charger.
Abstract: An ESD circuit is connected to a power pad and a first node. The ESD circuit includes a RC circuit and a first ESD current path. The RC circuit is connected between the power pad and the first node. The RC circuit is capable of providing a first control voltage and a second control voltage. The first ESD current path is connected between the power pad and the first node. When the power pad receives a positive ESD zap, the first ESD current path is turned on in response to the first control voltage and the second control voltages provided by the RC circuit, so that an ESD current flows from the power pad to the first node through the first ESD current path.
Abstract: A method for current limiting an operational amplifier includes sensing a first current through a first branch of the operational amplifier. The first branch conducts the first current from a limited current supply connected to an operational amplifier output. The first current is compared to a reference current to generate a regulation signal. A variable current source is controlled with the regulation signal. An output current of a transconductance amplifier is limited with the variable current source to limit the first current in response thereto.
Abstract: An electronic device includes a voltage regulator circuit having a power NFET coupled between an upper supply voltage and a pre-regulator output node and a current source coupled in series with a diode element between the upper supply voltage and a lower supply voltage. A gate of the power NFET is coupled to a first node between the current source and a diode element. A bypass circuit includes a power PFET coupled between the upper supply voltage and the pre-regulator output node. A comparison circuit is coupled to turn the bypass circuit off when the upper supply voltage is greater than a regulation threshold voltage.
Abstract: An AC-DC conversion device that includes a major circuit portion and a control circuit. The major circuit portion includes a converter in which multiple switch portions in a bridge connection include separately-excited switching elements and snubber circuits connected in parallel with the switching elements; and the major circuit portion is connected to an alternating current power supply and a direct current circuit and applies, to the direct current circuit, an alternating current voltage applied from the alternating current power supply by an ON of the multiple switch portions. The control circuit controls the voltage applied to the direct current circuit by controlling the ON timing of the multiple switch portions by inputting a control pulse to each of the multiple switch portions.
May 22, 2019
Date of Patent:
March 2, 2021
TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
Abstract: An electromagnetic relay deicing system includes an electromagnetic relay that includes a common terminal, a normally open terminal, and a normally closed terminal and that supplies electric power from an electric power supplier to an electrical apparatus when the common terminal and the normally open terminal are connected, and a control circuit that controls an on-state and an off-state of the electromagnetic relay. During the on-state of the electromagnetic relay, the common terminal and the normally open terminal are connected by a movable piece. During the off-state of the electromagnetic relay, the common terminal and the normally closed terminal are connected by the movable piece. The control circuit deices the electromagnetic relay by causing, during the off-state of the electromagnetic relay, electric conduction between the common terminal and the normally closed terminal connected by the movable piece so that ice on a surface of the normally open terminal melts.
Abstract: An inverter circuit (120) is configured so as to perform synchronous rectification by six switching elements (130). The switching element (130) is formed of an unipolar device (SiC MOSFET in this case) using a wideband gap semiconductor. The inverter circuit (120) uses the body diode (131) of SiC MOSFET (130) as a freewheeling diode during synchronous rectification.
Abstract: A tubing structure includes a first unit, a second unit movably connected to the first unit, and a controller. The first unit includes a first body and at least one first magnetic component disposed inside the first body. The second unit includes a second body movably engaging with the first body and at least one second magnetic component disposed inside the second body and located at a position corresponding to the at least one first magnetic component. The controller is electrically connected to at least one of the at least one first magnetic component and the at least one second magnetic component. The controller selectively controls the at least one first magnetic component and the at least one second magnetic component to magnetically attract or repulse each other to drive the second body to move relative to the first body for inclining the second unit relative to the first unit.
Abstract: A method for circuit breaker failure (CBF) protection in a power substation is disclosed. The power substation includes a first circuit breaker (CB), a second CB coupled to the first CB, a feeder coupled to the first CB and the second CB, a power plant coupled to the feeder, a first plurality of CBs coupled to the first CB, and a second plurality of CBs coupled to the second CB.
October 3, 2018
Date of Patent:
February 9, 2021
Mohammad Rezaei Jegarluei, Sina Moatar Rashkhari, Nader Kayvan, Mohammad Nabi Faraji
Abstract: The anti-windup circuit generally has a voltage clamping device in series with a current limiting device operatively connectable to the output current path of a feedback compensator; the feedback compensator being part of a switch-mode power supply (SMPS) having an input voltage source and a load and generating constrained control values required to generate control on-off actions for tight power regulation. The inclusion of the disclosed anti-windup circuit in an SMPS may lead to hardware based overvoltage protection, reduced overall size and faster response to load changes.
Abstract: A power supply device includes a power supply, a conversion unit performing voltage conversion on electric power to be supplied from the power supply, and a control unit generating a first control signal for inputting or outputting a target voltage or a target current to and from the conversion unit by a feedback loop, and controlling the conversion unit based on the first control signal and a second control signal for detecting a state of the power supply, generated outside the feedback loop. The control unit sets a specific parameter of the second control signal based on a feedforward term based on the output of the power supply and a feedback term in which the specific parameter included in at least one of electric power output from the power supply and input into the conversion unit and electric power output from the conversion unit, is a feedback component.
Abstract: A power supply control device includes a switch disposed in a first current path of a current flowing from a battery. A first comparator compares a voltage value of a current input end of the switch to which the current is inputted with a voltage threshold. When the voltage value of the current input end is less than the voltage threshold, a drive circuit turns off the switch. The battery supplies, via a second current path, power to a starter that starts an engine of a vehicle. The voltage threshold is less than the voltage value of the current input end of the switch in the case where the battery supplies the power to the starter.
Abstract: A multi-level inverter having one or more banks, each bank containing a plurality of low voltage MOSFET transistors. A processor configured to switch the plurality of low voltage MOSFET transistors in each bank to switch at multiple times during each cycle.
May 8, 2020
Date of Patent:
January 5, 2021
Solaredge Technologies Ltd.
Ilan Yoscovich, Tzachi Glovinsky, Guy Sella, Yoav Galin
Abstract: An electrical power converter includes a dual buck power stage with a first half bridge and second half bridge. Each of the half bridges is arranged between a first common node and a second common node. Each of the half bridges comprises an upper switching element and a lower switching element. The upper switching element is configured to switch a current between the first common node and a respective first or second bridge midpoint. The lower switching element is configured to switch a current between the respective first or second bridge midpoint and the second common node. The first and second bridge midpoints are connected to a summing node via respective first and second dual buck inductors. A main switching stage is arranged to supply, through a main stage inductor and through a main output line, a main stage current to the summing node.
Abstract: The invention relates to a method for distributing the total power of an energy conversion device between at least two converters in said energy conversion device, the sum of the conversion powers of the converters being the total power of the conversion device, the energy conversion device converting energy between a first electrical entity and a second electrical entity, characterised in that: said at least two converters correspond to at least two portions of a ring (29), the portions being proportional to a predetermined power value of the respective converters (1) thereof, the combination of the at least two portions forming the whole ring; and in that the total power of the conversion device corresponds to an arc of the ring between the positions of a first slider and a second slider that are movable around the ring, and the distribution of power between the converters is determined by the positions of the first slider and the second slider that are movable around the ring.