Abstract: A controller for use in a power converter includes a comparator that receives an output signal representative of an output voltage of the power converter. The comparator generates a constant voltage signal in response to a comparison of the output signal and a reference signal. A switch request circuit receives the constant voltage signal and a fault signal. The switch request circuit generates a request signal in response to the constant voltage signal and the fault signal to control switching of a power switch of the power converter to control a transfer of energy from an input of the power converter to the output of the power converter. A power limit fault circuit receives the request signal. The power limit fault circuit generates the fault signal to indicate a fault existence in the power converter in response to a rate of consecutive request pulses greater than a threshold.
May 21, 2018
Date of Patent:
July 16, 2019
Power Integrations, Inc.
Karl Moore, Antonius Jacobus Johannes Werner
Abstract: A semiconductor device includes a semiconductor chip, a cell surface electrode portion, and a peripheral edge surface structure portion. The semiconductor chip has a cell portion and a peripheral edge portion provided around the cell portion in plan view. The cell surface electrode portion is provided on the cell portion. The peripheral edge surface structure portion is provided on the peripheral edge portion. The peripheral edge portion is made thinner than the cell portion so that a back surface of the peripheral edge portion is more concave than a back surface of the cell portion. When the thickness of the cell portion is represented by tc and the size of the step between the cell portion and the peripheral edge portion on the back surface is represented by dtb, 0%<dtb/tc?1.5% is satisfied.
Abstract: Methods and apparatus for detecting a zero inductor current to control switch transitions for a power converter. An example method includes outputting a first voltage and a first current, receiving the first voltage and output a second voltage into an input of a comparator, when the second voltage is above a third voltage, outputting a first output voltage, when the second voltage is below the third voltage, outputting a second output voltage, determining when the first current is zero based the output of the comparator, enabling a set of switches based on when the first current is zero.
Abstract: A multi-controllable high voltage power supply having a plurality of filters, a high voltage divider, and a processor with memory. The memory contains operating set points. The processor is configured to receive scaled voltage feedback signals from the high voltage divider, compare the scaled voltage feedback signals to the plurality of operating set points in memory, compute and store revised operating set points using the compared scaled voltage feedback signal, use the revised operating set points to simultaneously and automatically regulate output voltage to be within all operating set points, and generate an alert when output conditions exceed any operating set points.
July 2, 2018
Date of Patent:
July 16, 2019
Craig Sean Dean, Lynn Edward Roszel, Scott Richard Wilson, Erik Steven Haugarth, Jan Simon Reuning
Abstract: A DC-DC converter includes a voltage input portion that receives a DC voltage, a voltage output portion to which a load is connected, a transformer that includes at least a primary winding and a secondary winding, a main switch element between the voltage input portion and the primary winding of the transformer, a rectifier circuit between the voltage output portion and the secondary winding of the transformer, and a reset voltage suppressing circuit that detects a magnitude of a reset voltage generated when excitation energy accumulated in the transformer is reset and reduces a voltage which is applied to the main switch element when the magnitude of the reset voltage exceeds, for example, a predetermined threshold value.
Abstract: Controlling a switching power supply can include: generating a ramp signal having an amplitude that follows an output feedback signal of the switching power supply; and controlling a switching state of a main power transistor in the switching power supply to be switched when the ramp signal reaches a peak value such that an output signal of the switching power supply is maintained as substantially constant.
Abstract: A novel low dropout regulator (LDO) is presented. The LDO includes the generation of a first feedback signal and a second feedback signal. The first feedback signal and a reference signal connect to a first error amplifier. The second feedback signal and the first error amplifier output signal connect to a second error amplifier. The output signal from the second error amplifier is coupled to the gate of a FET transistor. The FET transistor can be either a p-channel FET transistor, an n-channel FET transistor, a NMOS pass transistor, or a PMOS pass transistor. The positive input terminal or the negative input terminal of the first amplifier or of the second amplifier therefore need to be configured accordingly. When the source of the FET transistor is connected to the input voltage VIN, the drain of the FET transistor is the output voltage VOUT; when the drain of the FET transistor is connected to the input voltage VIN, the source of the FET transistor is the VOUT.
Abstract: A method for sensing an output current of a Direct Current-to-Direct Current (DC/DC) converter having an external power stage configured to supply a converted current to an external inductor. During a calibration phase at a first start-up of the DC/DC converter: the method includes injecting a calibration current through a switching node of the power stage and through the inductor; and determining a calibration gain of the DC/DC converter to compensate for DC Resistance (DCR) variation by comparing a gain-adjusted voltage across the inductor with a reference voltage. During a measurement phase, the method includes reducing ripple voltage of a switching voltage at the switching node to generate a ripple-reduced switching voltage; and sensing the output current based on a DCR-compensated voltage across the inductor, which is a difference between the ripple-reduced switching voltage and an output voltage of the DC/DC converter with compensation for the DCR variation based on the calibration gain.
Abstract: A device includes a three phase supply input including a first phase input, a second phase input, and a third phase input. The device further includes a three phase supply output including a first phase output, a second phase output, and a third phase output. The device further includes a three-phase wye-connected auto-transformer having windings including a first winding, a second winding, and a third winding. At least one of the windings is rated for at least a maximum line to line voltage of the three phase supply input. The other two windings are rated for at least a maximum line to neutral voltage of the three phase supply input. One or more of the windings of the three-phase wye-connected auto-transformer are configured to be tapped to generate a voltage sag output as the three phase supply output.
Abstract: A switched capacitor converter includes a primary switching circuit, a flying capacitor circuit, and a secondary switching circuit. The primary switching circuit includes plurality of switching transistors in series. The flying capacitor circuit includes one or more flying capacitors with each flying capacitor connected to a switching transistor. The secondary switching circuit includes two or more switching transistors and provides a first path for charging and a second path for discharging the flying capacitors. At startup, the flying capacitors are discharged via a first current source while the switching transistors are turned off. After discharging, the flying capacitors are charged via a second current source, while a first switching transistor of the primary switching circuit is kept turned off and the rest of the switching transistors perform switching according to a switching cycle. After charging, the switched capacitor converter may enter a steady state operation.
Abstract: A step-up/down power supply, in which a circuit area is small, includes a step-down unit that generates an output voltage lower than an input voltage by turning on or off a step-down switch in which the input voltage of the step-up/down power supply is applied, and a step-up unit that generates an output voltage higher than the input voltage by turning on or off a step-up switch in which a ground is applied. A step-down gate voltage control circuit controls a gate voltage of the step-down switch and includes a gate voltage generating circuit that generates a first voltage and a second voltage for turning on the step-down switch. A gate voltage switching circuit switches between the first voltage and the second voltage, and the gate voltage generating circuit includes a first voltage source that generates the first voltage and a second voltage source that generates the second voltage.
Abstract: A reference circuit constituted of: a voltage/current bias circuitry; a first transistor coupled between a common voltage and an first bias circuitry output; a second transistor coupled between the common voltage and a second bias circuitry output; a third transistor coupled between the common voltage and an output providing a temperature and supply invariant current; a resistor coupled between the second transistor and the second output of the bias circuitry; and an output providing a temperature and supply invariant voltage coupled between the resistor and the second transistor, the voltage output terminal further coupled to a gate of the third transistor, wherein the bias circuitry is arranged, in cooperation with the first transistor, to generate a first current at the first output thereof, and, in cooperation with the second transistor, to generate a second current at the second output thereof, the current magnitudes exhibiting a ratio of a predetermined value.
Abstract: The inverter circuit has a first silicon carbide MOSFET and a second silicon carbide MOSFET connected in series and external freewheel diodes respectively connected in anti-parallel to the first and second MOSFETs. The inverter circuit is configured such that during a deadtime when the first silicon carbide MOSFET and the second silicon carbide MOSFET are OFF and freewheeling current starts flowing, a pulse width of a transient current flowing to a built-in diode of the first silicon carbide MOSFET or a built-in diode of the second silicon carbide MOSFET is less than 2 ?s.
Abstract: The switching power supply device includes switching circuits, a transformer, an LLC resonance circuit, a microcomputer and a frequency regulator that sets switching frequencies of the switching circuits and a current detection circuit that detects the current Ir. The microcomputer and the frequency regulator sweep a switching frequency, and set a switching frequency on the basis of times to start the dead times of the switching elements, the current Ir detected by the current detection circuit, and the threshold current Imin.
Abstract: A control device applied to a flyback converter including an auxiliary switch includes: an output voltage integrator, configured to integrate an output voltage of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller, configured to compare the obtained amplitude of the negative magnetizing current with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero voltage switching of a primary-side switch of the flyback converter with variable outputs.
Abstract: A switching regulator includes: a controller power ON reset (POR) circuit, a controller post-POR signal generation circuit, and a pulse width modulation (PWM) signal generation circuit. The controller post-POR signal generation circuit switches the controller post-POR signal to a ready level after a controller pre-POR signal is switched to a controller reset-accomplished level and a driver signal starts switching levels to operate a power switch. The PWM signal generation circuit sets a duty ratio of a PWM signal to a predetermined minimum duty ratio after the controller pre-POR signal is switched to the controller reset-accomplished level and before the controller post-POR signal is switched to a ready level.
Abstract: A switching regulator includes a clamp circuit which clamps the output voltage of the error amplifier to the clamp voltage when an output voltage of an error amplifier is higher than a clamp voltage, a constant voltage generation circuit having one end connected to an output terminal of the error amplifier, and a phase compensation capacitor having one end connected to the other end of the constant voltage generation circuit, and the other end connected to a ground terminal. When the clamp circuit clamps the output voltage of the error amplifier, the constant voltage generation circuit lowers the voltage at one end of the phase compensation capacitor by a prescribed voltage. When the clamped state of the output voltage of the error amplifier is released, the constant voltage generation circuit lowers the voltage of the output terminal of the error amplifier from the clamp voltage by the prescribed voltage.
Abstract: Systems and methods for controlling a DC to AC inverter providing a multiphase output at a fundamental frequency are provided. More particularly, a synchronous reference frame control scheme can be employed to regulate a DC to AC inverter to attenuate error at various frequencies of interest for the DC to AC inverter. According to particular example aspects of the present disclosure, the synchronous reference frame control scheme can include control structures to provide for attenuation of the negative sequence and zero sequence currents, leading to reduced total harmonic distortion and voltage unbalance in the output voltage of the inverter.
Abstract: A power supply device that can perform feedback control with high responsivity when an output current greatly changes is realized with a configuration that can further reduce power consumption. A power supply device is configured to (i) detect a current change ratio ?Ir of a current output from a voltage conversion unit; (ii) determine a processing speed in such a manner that the larger the detected current change ratio ?Ir is, the higher the processing speed is; and (iii) compute a duty ratio of a PWM signal that is to be supplied, based on a predetermined target values Ita and Vta and a current value Iout and a voltage value Vout, and that outputs, a PWM signal that has been set so as to have the duty ratio obtained through the computation.
Abstract: A converter includes first and second coupled inductors. A first phase includes first high side and low side switches connected to the first inductor. A second phase includes second high side and low side switches connected to the second inductor. In discontinuous conduction mode, the controller determines, in response to the first high side switch being turned on and the second low side switch being turned off, that coupling between the first and second inductors is strong or weak based on whether body diode of the second low side switch will conduct if not prevented from conducting. The controller prevents second low side switch body diode conduction in response to the first high side switch being turned on when the coupling is strong, and does not prevent second low side switch body diode conduction in response to the first high side switch being turned on when the coupling is weak.
May 7, 2018
Date of Patent:
June 18, 2019
MAXIM INTEGRATED PRODUCTS, INC.
Xin Zhou, Justin Michael Burkhart, Brett A. Miwa