Abstract: A control circuit for controlling a switching circuit is disclosed. The control circuit has a ramp compensation circuit, a ramp regulating circuit and a comparison circuit. The ramp compensation circuit generates a ramp compensation signal with the amplitude proportional to the difference between 1 and the duty cycle of a main switch of the switching circuit. The ramp regulating circuit generates a ramp regulating signal with the amplitude proportional to the duty cycle of the main switch. The comparison circuit compares a reference signal with the sum of the ramp compensation signal, the ramp regulating signal and a feedback signal representative of an output voltage of the switching circuit, so as to provide a comparison result to control the switching circuit.

Abstract: The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a sinusoidal reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.

Abstract: An apparatus and method for compensating for a ripple and offset of an inverter and an apparatus and method for compensating for a ripple and offset of an inverter which removes a ripple component by compensating for an offset component included in a signal input to the inverter from an inverter controller. A method that senses a direct current (DC) input to an inverter from an inverter controller and an alternating current (AC) output from the inverter and removes a ripple component included in the DC based on the sensed currents, a method that removes a ripple component included in a reference voltage that is output from an inverter controller and is input to an inverter, and a method that compensates for an offset component of an AC voltage/AC used for inverter control and reduces a ripple component corresponding to an output frequency of an inverter.

Abstract: An output voltage of an LLC resonant converter circuit is received. The received output voltage is analyzed to determine whether the received output voltage is within an acceptable operational range. When the output voltage is not within the acceptable operational range and the operational frequency is below a maximum predetermined frequency, the operational frequency of the LLC resonant converter circuit is adjusted. The adjustment of the operational frequency is effective to change the output voltage to a value that is within the acceptable operational range. When the output voltage is not within the acceptable operational range and the operational frequency is above the maximum predetermined frequency, a phase shift in the LLC resonant converter circuit is adjusted. This adjustment is effective to change the output voltage to a value that is within the acceptable operational range.

Abstract: A voltage conversion circuit has a plurality of primary capacitors charged by a power supply, a secondary capacitor connected in parallel to the respective plurality of primary capacitors that is charged at a voltage supplied to a load circuit, a plurality of switching circuits provided in association with the respective plurality of primary capacitors that change over a connection state between the primary capacitors and the secondary capacitor, and a connection control circuit that successively connects the respective primary capacitors to the secondary capacitor through the corresponding switching circuits, the respective primary capacitors across which the charging voltages reach a predetermined connection voltage higher than a charging voltage across the secondary capacitor.

Abstract: According to an embodiment, a power supply circuit is provided. The power supply circuit includes a switching transistor which is controlled to be ON/OFF by a PWM signal, and a mode switching control circuit configured to switch a control mode between peak current mode control and valley current mode control depending on the length of an ON time of the PWM signal which drives the switching transistor.

Abstract: Regulation of powertrain converter circuits is provided. The power conversion may include converting between direct current and alternating current and the regulation may include reduction of distortion on switching start up and zero-crossings. Solid-state implementations, code implementations, and mixed implementations are provided.

Abstract: A power converter (e.g., AC-DC converter) includes an input inductor coupled between a first AC voltage source input node and a central node, a first switch coupled between the central node and a first rail node, a second switch coupled between the central node and a second rail node, and a resonant output circuit. The first switch has a body diode that passes current from the first rail node to the central node. The second switch has a body diode that passes current from the central node to the second rail node. A first input device controls current flow between the first rail node and the second AC voltage source input node, and a second input device controls current flow between the second rail node and the second AC voltage source input. The output circuit includes at least one capacitor and at least one inductor which form a resonant network, hence are denominated as resonant capacitor(s) and resonant inductor(s).

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

Abstract: A power converter system includes first and second input terminals; a converter connected to the first and second input terminals and including an output terminal; a start-up circuit connected to a first capacitor and configured to charge the first capacitor during start-up and hiccup conditions; a voltage source connected to the first and second input terminals and configured to provide, during the start-up and hiccup conditions, a voltage proportional to a voltage applied to the first and second input terminals; and a voltage buffer including a MOSFET with a gate connected to the voltage source, a source connected to the start-up circuit, and a drain connected to one of the first and second input terminals.

Abstract: A high efficiency switched capacitor voltage regulator circuit and a method of efficiently generating an enhanced voltage from an input voltage supply. An input voltage Vin from a main power source is the base voltage to be pumped to an enhanced voltage. Auxiliary voltage sources V1 and V2 are from sources (or grounds) available in the system. During phase 1 of a clock signal, a pump capacitor is charged to ?V=V2?V1. During phase 2 of the clock signal, the pump capacitor is connected in series between Vin and an output capacitor, resulting in the sum voltage V=Vin+?V being generated across the output capacitor.

Abstract: A power conversion device includes a power switch a first main terminal coupled to a higher potential portion, a second main terminal coupled to a lower potential portion, and a tap coupled to the first main terminal to provide a current for charging a supply terminal capacitor. A controller is coupled to a control terminal of the power switch to control switching of the power switch to produce a regulated output. A supply terminal is to be coupled to a supply terminal capacitor to store a charge for supplying power to at least some of the components of the controller. A voltage regulator is coupled to regulate the charge stored and a potential on the supply terminal capacitor. The current for charging the supply terminal capacitor is selectively drawn from the tap of the power switch in response to the supply terminal capacitor being below a threshold.

Abstract: A regulator circuit includes: a current detector configured to sense a load current and convert the sensed load current to a DC current sense signal; and an adjustment circuit configured to adjust an output voltage within predetermined upper and lower voltage limits based on the DC current sense signal.

Abstract: Systems and methods for facilitating online to offline commerce are disclosed. In one embodiment, a system configured to receive a request to check-in a customer at a merchant facility is disclosed. The system receives a request to access real-time pre-sale transaction data associated with a first customer and transmits the real-time pre-sale transaction data associated with the first customer to a mobile client device. The request to check-in and the request to access the real-time pre-sale transaction data are transmitted by the first mobile client device. The system is configured to authenticate the request to check-in at the merchant facility, process the request to access the real-time pre-sale transaction data, and responsively access the real-time pre-sale transaction data associated with the first customer from a point of sale device located at the merchant facility.

Abstract: A switching DC-DC voltage regulator (VR) provides for light and sinking loads by compute components of an information handling system (IHS). A controller detects a load current value and a voltage output value of a synchronous Buck VR. In response to detecting that the load current value is less than a threshold value, the controller drives a high side control switch (HS) and low side synchronous switch (LS) to regulate an output voltage value across a capacitor by causing an inductor current ripple through an inductor of the synchronous Buck VR in discontinuous conduction mode (DCM) to reduce power consumption during a light load. In response to detecting an electrical characteristic indicative of a voltage overshoot of the output voltage, the controller drives the HS and LS to cause the synchronous Buck VR to perform forced continuous conduction mode (FCCM) to sink the load current each switching cycle.

Abstract: An information processing system including plural terminals, a base station to communicate with the terminals, and a management server coupled via a network to the base station, in which each terminal includes a behavioral information sensor to acquire behavioral information on the person wearing the terminal, and the management server retains the predefined relations among the persons within the organization, receives and retains the behavioral information from each terminal, calculates the behavioral characteristic quantity showing behavioral characteristics of each person relative to other persons based on the behavioral information, sums the calculated behavioral characteristic quantities for each of the defined relations between the person and the other persons, and when information showing changes in the still non-implemented defined relations is acquired, estimates the behavioral characteristic quantity of the person after changing the defined relation according to the acquired information, based on th

Abstract: Disclosed is a buck converter for converting a high voltage at the input of the buck converter to a low voltage at the output of the buck converter. The buck converter includes a control circuitry configured to control a duty cycle of a control switch, the control switch being interposed between the input and the output of the buck converter. A synchronous switch is interposed between the output and ground. The control switch and the synchronous switch comprise depletion-mode III-nitride transistors. In one embodiment, at least one of the control switch and the synchronous switches comprises a depletion-mode GaN HEMT. The buck converter further includes protection circuitry configured to disable current conduction through the control switch while the control circuitry is not powered up.

Abstract: In one embodiment a method of extending power supply hold-up time by controlling a transformer turn ratio may include an input capacitor receiving an input voltage of a transformer unit. A first control transistor may switch a first transformer winding to an on state in response to the input voltage being above a voltage threshold level. The first control transistor may switch the first transformer winding to an off state in response to the input voltage being below the voltage threshold level. A second control transistor may switch a second transformer winding to an on state in response to the input voltage being below the voltage threshold level, wherein the first transformer winding and the second transformer winding may include separate windings located on a same side of a magnetic core of the transformer unit. In an embodiment the transformer unit may include a power supply unit.

Abstract: A circuit including: a three-level buck converter having: a plurality of input switches and an inductor configured to receive a voltage from the plurality of input switches, the plurality of input switches coupled with a first capacitor and configured to charge and discharge the first capacitor; a second capacitor at an output of the buck converter; and a switched capacitor at an input node of the inductor, wherein the switched capacitor is smaller than either the first capacitor or the second capacitor.

Abstract: Exemplary embodiments are related to switching power converters. A switching power converter may comprise a plurality of control unit configured for average current mode control, wherein each control unit of the plurality comprises a dedicated proportional control unit. The switching power converter may further comprise an integrator coupled to each control unit of the plurality of control unit and configured to convey a signal to each control unit.