Abstract: A driver IC comprises a voltage detector configured to detect an input voltage to the driver IC, a charge pump configured to generate a regulator driving voltage by amplifying the input voltage and output the regulator driving voltage, a regulator configured to receive the regulator driving voltage and output a regulator voltage, a gamma circuit configured to generate a gray scale voltage using the regulator voltage, and a voltage controller configured to generate a command signal corresponding to the input voltage. An OLED display comprises a pixel unit configured to display an image in response to a data signal, a scan signal, a light emitting control signal, first and second voltages, the driver IC, a scan driving unit, and a power supply unit configured to adjust levels of the first and second voltages in response to the input voltage, and transmit the first and second voltages to the pixel unit.

Abstract: Methods and apparatus for controlling a digital power supply are disclosed. An example method includes storing a first set of coefficients for controlling a digital power supply in a memory of the digital power supply, associating the first set of coefficients with a first set of characteristics of an input voltage for the digital power supply, storing a second set of coefficients for controlling the digital power supply in the memory of the digital power supply, associating the second set of coefficients with a second set of characteristics of the input voltage, receiving a first voltage from a voltage source at the digital power supply, determining that the first voltage has the first set of characteristics, and, in response to determining that the first voltage has the first set of characteristics, applying the first set of coefficients to the digital power supply.

Abstract: To provide a time constant circuit and the like capable of acquiring a characteristic of an output voltage that attenuates gradually after attenuating steeply, compared to a characteristic that attenuates monotonously. The time constant circuit includes: a series/parallel circuit formed by serially connecting a plurality of parallel circuits each formed with a resistance element and a capacitance element between a first terminal and a second terminal; and a voltage-dividing resistance element connected between a third terminal connected to the second terminal and a fourth terminal. A first parallel circuit is formed with a first resistance element and a first capacitance element, a second parallel circuit with a second resistance element and a second capacitance element, and an n-th parallel circuit with an n-th resistance element and an n-th capacitance element. Note that “n” is the number of the parallel circuits and it is an integer of 2 or larger.

Abstract: An electronic device is disclosed. The electronic device comprises at least one solar cell, and voltage-detection means operable to detect an output voltage of the at least one solar cell to obtain a detected output voltage. The electronic device also comprises control means operable to detect an operation of the at least one solar cell based on the detected output voltage, and to perform a predefined control depending on the operation.

Abstract: A method of scavenging power in a circuit having a power source generating electric current includes connecting a power scavenging device having an input terminal pair and an output terminal pair to the circuit via the input terminal pair, dynamically regulating a voltage drop across the input terminal pair of the power scavenging device, harvesting electrical energy available at the regulated voltage drop from the electric current flowing through the first input terminal pair of the power scavenging device, and providing the harvested electrical energy at the output terminal pair of the power scavenging device.

Abstract: Provided is a driver circuit that outputs, from an output end, an output signal corresponding to an input signal supplied thereto, comprising an output resistance section that is provided between a constant voltage source and the output end; an output switching section that switches voltage of the output end according to the input signal; and a switching section that switches a resistance value of the output resistance section. The output resistance section includes an output resistance FET having a source/drain connection between the constant voltage source and the output end, and the switching section supplies a control voltage to a gate of the output resistance FET such that the resistance between the source and the drain of the output resistance FET switches to a designated value.

Abstract: The present invention relates to an automatic voltage regulator, and more specifically, to an automatic voltage regulator capable of precisely controlling the output voltage level by using a toroidal autotransformer. The present invention has precise voltage control to enable the output of the voltage level desired by the user, and precisely carries out a variety of applications of power saving and voltage booster. In particular, the present invention can boost/reduce the input voltage to provide a desired target voltage within an error range of 1 volt or less. The present invention also comprises a simple relay switching circuit and excludes semiconductor switching devices, thereby being capable of operating adaptively in different system environments without an additional modification.

Abstract: A detection circuit for generating a control signal for controlling output voltage of an AC adapter. The detection circuit for an electronic device receives power information from an external power supply via a cable to generate the control signal that controls DC input voltage output from the external power supply. In the detection circuit, a correction voltage generation circuit generates a correction voltage in correspondence with the parasitic resistance of the cable. A power information correction circuit corrects the power information provided from the external power supply via the cable with the correction voltage to generate corrected power information. A detection signal generation circuit calculates the total power amount of the electronic device and generates a power detection signal corresponding to the total power amount. The control signal generation circuit generates the control signal based on the corrected power information and the power detection signal.

Abstract: A method for regulating a voltage in an integrated circuit device includes providing a first regulated output based upon a first voltage input range and subsequently receiving the first regulated output and providing a second regulated output based upon a second voltage input range of the first regulated output. A circuit is further provided that operates accordingly. Additionally, a clipper circuit is provided at the input to protect for over voltage conditions that may results, for example, from a charging battery to cause an output voltage of the battery to substantially exceed ordinary output voltage levels.

Abstract: Valve positioning systems may include one or more components and a controller. Components may include one or more electric-to-pressure output converters, relays, gas supplies, and/or actuators. A controller may adjust a position of a valve by sending a signal. The valve positioning system may individually monitor components and determine the condition of each component being individually monitored. The valve positioning system may determine if a component will fail prior to failure and/or determine if a problem will occur in a component prior to the problem occurring.

Abstract: A cat-ear power supply is operable to generate a DC voltage and draws current from an AC power source near the beginning and end of a half-cycle of the AC power source. A controllably conductive switching circuit selectively charges an energy storage capacitor to produce the DC voltage and become conductive to charge the energy storage capacitor near the beginning of the half-cycle of the AC power source. A latch circuit controls the controllably conductive switching circuit to become non-conductive in response to the magnitude of the DC voltage. A switch voltage monitor circuit controls the controllably conductive switching circuit to become non-conductive and resets the latch circuit when the magnitude of a switch voltage across the switching circuit exceeds a predetermined switch voltage threshold. The switching circuit becomes conductive to charge the energy storage capacitor near the end of the half-cycle when the magnitude of the switch voltage drops below the predetermined switch voltage threshold.

Abstract: Systems and methods for producing a substantially constant output voltage in a power source boost system are provided. A power supply boost circuit includes an output node for supplying an output voltage, a feed forward loop configured to be coupled to a load and a power source, and a feedback loop including a voltage limiter coupled to the feed forward loop and the output node. One power source boost system includes the above power source boost coupled to a load and a power source. A method includes the steps of comparing, via a feedback loop, a constant voltage to a reference voltage, and stabilizing a power source boost system over a range of input voltages and load variations. The stabilizing step includes the step of limiting, via a limiter, a voltage supplied to a feed forward loop to a predetermined range of voltages based on the comparing step.

Abstract: A method and a control unit for controlling a power level being drawn from a power source (26). Based on a determined rate of change of a measured voltage (1) an estimated remaining runtime is calculated. The estimated remaining runtime represents a time where specific run criteria will no longer be fulfilled if the present power level is maintained. The estimated remaining runtime is compared to a threshold value, and in case the estimated remaining runtime is shorter than the threshold value, the power drawn from the power source (26) is decreased. Thereby the runtime for the power source (26) is maximised. This is particularly useful if the power source is a limited power source, such as a battery (26), e.g. for running a compressor (27) for a movable refrigeration system (24). The invention is suitable for automotive applications.

Abstract: In one embodiment, a power supply controller is configured to operate in a test mode that facilitates measuring the value of an output signal of an error amplifier of the power supply controller.

Abstract: The present invention provides a power-saving laser pointer mouse including a battery, a micro-controller and a laser diode. The power-saving laser pointer mouse can be operated in multi-stage power-saving modes according to the voltage value of the battery. The lighting time interval of the laser diode is adjusted by the micro-controller according to the voltage value of the battery. When the voltage value of the battery is reduced, the lighting time interval of the laser diode is shortened so as to achieve the power-saving purpose.

Abstract: This disclosure relates to a voltage regulator system where duty cycle value of an input voltage is measured, where the input voltage is supplied to a regulator circuit that provides a regulated output voltage. Based on a calculated ideal duty cycle, which is derived from the measure duty cycle, a determination is made as to whether the regular circuit operational mode is to be changed to achieve greater efficiency.

Abstract: A power supply with non-isolated DC DC splitting includes n conversion cells that are interlaced. The splitting switch of each cell is placed in a resonant circuit. The resonant circuit makes it possible to obtain a switching to the open state of said switch at zero current and voltage. The ripple at the input and output is minimized and the efficiency improved. In particular, the wiring inductances in the charge transfer loop of each cell no longer have negative effects on the efficiency. The cell may be of boost, buck, buck/boost, Cuk or SEPIC topology.

Abstract: A power supply circuit capable of providing two regulated voltages based on a D.C. input voltage, including a boost converter and a buck-boost converter, the circuit including a single inductive element common to the boost and buck-boost converters.

Abstract: A method for controlling a power supply is disclosed. An example method includes deactivating the power supply in response to a first current through a first terminal of a power supply controller falling below a first threshold value. The power supply is activated in response to the first current through the first terminal rising above a second threshold value. Deactivating the power comprises causing a power switch coupled to a primary winding of the power supply not to receive a switching waveform for more than one cycle until the power supply is activated.

Abstract: A power converter for and method of producing a monotonic rise in output voltage at start-up. In one embodiment, the power converter includes a switch and an error amplifier coupled to an output terminal of the power converter. The power converter also includes a comparator with an output terminal coupled to a control terminal of the switch and an input terminal coupled to an output terminal of the error amplifier configured to enable the switch to conduct for a duty cycle. Additionally, the switch is configured to be turned off at a start-up of the power converter until a voltage of the output terminal of the error amplifier provides a duty cycle for the switch corresponding to an output characteristic pre-charge condition.

Abstract: A current-mode controlled switching regulator and control method therefor. The switching regulator includes input and output terminals, a switching device to switch in accordance with a control signal, an inductor to store charge from an input voltage at the input terminal based on the switching device, a rectifying device to discharge the charge stored in the inductor, an error amplifier to amplify a voltage difference between a divided voltage generated by dividing an output voltage at the output terminal and a predetermined reference voltage, a slope voltage generator to generate and output a slope voltage having a slope angle corresponding to the input voltage, and a switching controller to compare a voltage output from the error amplifier with the slope voltage, generate a pulse signal with a duty cycle corresponding to a comparison result, and control the switching of the switching device according to the pulse signal.

Abstract: Methods, apparatus, and products for selecting a redundant power supply mode for powering a computer system are disclosed that include detecting, by a voltage monitoring module, an input voltage level of a power supply; determining, by the voltage monitoring module, whether the input voltage level of the power supply is greater than a predetermined threshold value; if the input voltage level of the power supply is greater than the predetermined threshold value, configuring, by the voltage monitoring module, the power supply for an N+N redundant power supply mode having N primary power supplies and N redundant power supplies; and if the input voltage level of the power supply is not greater than the predetermined threshold value, configuring, by the voltage monitoring module, the power supply for an N+M redundant power supply mode having N primary power supplies and M redundant power supplies, where N is greater than M.

Abstract: A power supply comprises an input voltage detector that detects a drop in input voltage that corresponds to an input voltage loss. A power converter is coupled to the input voltage detector. The power converter, which may be a boost converter or a power factor correction converter, has a switching device that is actuated in accordance with a duty cycle. A duty cycle adjuster is responsive to detection of the drop in the input voltage to adjust the duty cycle of the switching device in order to limit an input current surge through the switching device below a desired level after the input voltage returns.

Abstract: A circuit for driving a load includes a power line, converter circuitry, and a controller. The power line is operable for providing an input current and an input voltage. The converter circuitry coupled to the power line is operable for converting the input voltage to a regulated voltage to drive the load, and for providing a current detection signal indicating whether a converter current flowing through the converter circuitry drops to a predetermined level. The controller coupled to the converter circuitry is operable for correcting a power factor of the circuit based on the current detection signal and the input voltage such that a waveform of the input current follows a waveform of the input voltage.

Abstract: A method for sensing the supply current of a switched DC-to-DC converter is discussed. The method sensing a first voltage that is proportional to the supply current, wherein the first voltage has first noise; outputting a second voltage that is based on the first voltage, and wherein the second voltage has second noise that is smaller than the first noise; and comparing the second voltage to a reference voltage to provide an indication of the supply current. According to the systems and methods disclosed herein, accurate current sensing is provided.

Abstract: A power supply apparatus with an inrush current prevention circuit is applied to a parallel power bus. The power supply apparatus includes a filter capacitor and a current control unit. The current control unit is electrically connected to the filter capacitor. The current control unit controls a charged current flowing through the filter capacitor to prevent an inrush current generated in the parallel power bus.

Abstract: An apparatus comprises a synchronous converter for providing a regulated output voltage responsive to an input voltage, a control PWM signal to a control switch of the synchronous converter and a synchronous PWM signal to a synchronous switch of the synchronous converter. A first circuit generates the control PWM signal and the synchronous PWM signal responsive to a PWM control signal. The first circuit limits a maximum duty cycle of the synchronous PWM signal to a predetermined level.

Abstract: The power management circuit includes a sampling unit, a reference voltage unit, a comparator, and a power managing unit. The sampling unit divides an input voltage from the power supply to generate a sampling voltage. The reference voltage unit receives the input voltage and generates a reference voltage when the input voltage is larger than a predetermined value. The comparator compares the sampling voltage with the reference voltage, generates a first signal when the sampling voltage is larger than the reference voltage, and generates a second signal when the sampling voltage is smaller than the reference voltage. The power managing unit establishes an electrical connection between the power supply and the load according to the first signal, and cuts off the electrical connection between the power supply and the load according to the second signal. A related electronic device is also provided.

Abstract: Methods and circuits for power supply arrangement and control are disclosed herein. In one embodiment, a switching regulator can include: (i) a filter network coupled to an output terminal, where an output voltage is generated at the output terminal from an input source; (ii) an active switch to connect the input source to the filter network by periodically operating between on and off states over a switching period, where a duty cycle of the on state relative to the switching period is modulated based on a PWM control signal; (iii) a comparator receiving an output feedback signal, a hysteresis signal, and a reference level, and providing the PWM control signal therefrom; and (iv) a hysteresis programming circuit generating the hysteresis signal, and a ramp control signal, where the hysteresis signal is programmed based on conditions at the input source and the output voltage to achieve a pseudo constant frequency operation.

Abstract: Provided are a voltage boosting circuit and a display device including the same. The voltage boosting circuit includes a booster input voltage generator configured to receive a power supply voltage, operate with a first current drive capability, and generate a booster input voltage in a switched mode in which the voltage boosting circuit switches from a standby mode to an operation mode, and configured to receive the power supply voltage, operate with a second current drive capability higher than the first current drive capability, and generate the booster input voltage in the operation mode, and a booster configured to receive the booster input voltage and generate a boost voltage.

Abstract: A circuit arrangement and method for power regulation and an amplifier arrangement for power regulation are described.

Abstract: In a preferred embodiment for use in step-down (buck) DC-DC converters that may operate, at least part of the time, at high duty cycles (>50%), the power dissipation in the high side switch is effectively monitored and the switching frequency of the converter is lowered as needed to keep the sum of the conduction losses and switching losses in the high side switch substantially constant. In another embodiment, the ideal switching frequency is approximated. In still another embodiment having the switches integrated with the controller, the die temperature is monitored, and switching frequency, output current or both are varied to limit the die temperature.

Abstract: One embodiment of the invention includes a hysteretic power regulator system. The system includes a switching stage configured to periodically couple an input voltage to an inductor in response to a control signal to generate an output voltage. The system also includes a hysteretic control stage configured to generate the control signal based on a comparison of a feedback voltage associated with the output voltage and a predetermined reference voltage. The system also includes a feed-forward stage configured to generate a feed-forward ramp voltage in response to the control signal. The feed-forward ramp voltage can be added to the feedback voltage to set a frequency of the control signal. The system further includes a compensation stage configured to cancel a DC error associated with the feed-forward ramp voltage relative to the feedback voltage to substantially mitigate errors associated with the output voltage.

Abstract: A voltage regulator includes a node, circuitry, a regulating transistor, a disabling transistor, and a voltage follower stage. The circuitry is coupled to the node for providing a current to the node. The regulating transistor is coupled between the node and a first power supply voltage terminal. The disabling transistor is coupled in parallel with the regulating transistor for selectively disabling the regulating transistor by directly connecting the first power supply voltage terminal to the node. The voltage follower stage is coupled between the first power supply voltage terminal and a second power supply voltage terminal. The voltage follower stage has an output connected to a control electrode of the regulating transistor, and an input connected to the node.

Abstract: A driver circuit raises an output transistor signal smoothly while suppressing decreases in voltage. A motor driver includes a transistor connected to a buffer of a pre-driver. An external terminal of the motor driver is connected to a regulator to supply first and second transistors with voltage. The gates of the first and second transistors are connected to the drain of the other one of the first and second transistors. The first transistor is connected to a third transistor, which receives an input signal. The second transistor is connected to a fourth transistor, which receives the inverted input signal. The external terminal is connected to the gate of a further transistor. The further transistor has a source connected via a fifth transistor to a buffer, and a drain connected to the regulator.

Abstract: The present invention discloses a cascade device with a voltage regulating effect. The cascade device can be applied to a power supply of a cascade structure and includes a comparing element and a power control element. The comparing element provides for inputting a sampling voltage and a reference voltage, and outputs a control signal to the power control element when the sampling voltage is larger than the reference voltage. Next, the power control element can control an input voltage to be outputted to grounding, according to the control signal. Therefore, a control circuit can be provided with a stable voltage source, without requiring an extra rectifying device.

Abstract: A contact-input circuit for a power system device is described for processing a higher voltage signal from power system equipment or another power system device for use by a lower voltage circuit. The contact-input circuit generally includes a voltage threshold detection device adapted to allow current to flow therefrom when it detects that the higher voltage signal reaches a select threshold. An opto-isolator device, which is coupled to the voltage threshold detection device, provides a voltage signal suitable for use by the lower voltage circuit when the threshold detection device allows the current-flow through the opto-isolator.

Abstract: A voltage detection circuit comprises a tap to be connected to a positive line and a return tap to be connected to a return line on a power supply. The potential difference between the positive line and the return line is the input line voltage. A scaling resistor network scales down the input line voltage to be indicative of a voltage on the input line. The scaled voltage is connected to an input for a comparator. A reference voltage is supplied to the comparator. The reference voltage supplied to the comparator is indicative of a threshold voltage at which an output of the circuit changes states. An output of the comparator communicates a signal to an optical isolation device when the input line voltage is below the threshold voltage to turn the optical isolation device on and send a signal to an output of the optical isolation device. The optical isolation device is not turned on if the input line voltage exceeds the threshold voltage.

Abstract: A truly Bridgeless PFC converter is provided which eliminates the four-diode bridge rectifier and operates directly from the AC line to result in high-efficiency, small size and low cost solution for Power Factor Correction applications.

Abstract: A power supply voltage detection circuit of the present invention includes a reference signal generation circuit that generates a reference signal according to a power supply voltage, a first transistor having a current flowing between a first terminal and a second terminal, where the current is controlled according to the reference signal, a voltage generation circuit that generates a control voltage according to a potential difference between the power supply voltage and the first terminal of the first transistor, and a second transistor that controls whether or not to output the power supply voltage according to the control voltage. Such circuit configuration enables to accurately detect a low voltage state of the power supply voltage.

Abstract: A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a startup mode to a normal operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the startup mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop with a current consumption of no more than a microampere. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the normal operation mode to the startup mode when the input supply voltage is below a second threshold voltage.

Abstract: According to an exemplary embodiment, a method includes the step (910) of driving a buck section of a DC/DC converter with a buck signal that has a buck duty cycle and concurrently with driving the buck section, driving a boost section of the DC/DC converter with a boost signal that has a boost duty cycle, a difference existing between the buck duty cycle and the boost duty cycle. The method also includes the step (920) of monitoring an input voltage that is coupled to the buck section for a change in the input voltage, and in response to a change in the input voltage, the step (930) of changing the buck duty cycle and the boost duty cycle such that the difference between the buck duty cycle and the boost duty cycle is substantially constant.

Abstract: Circuits and methods for a switched power converter providing charge power for at least one battery and at the same time delivering current to operate an electronic device, wherein the converter is enabled to operate out of current limit mode, for the maximum possible range of system load requirements, have been achieved. The input current of the power converter is measured within each cycle-by-cycle, i.e. within each cycle of an external clock reference and the charge current is reduced if the input current exceeds a defined portion, e.g. 80% of the maximum allowable input current. The power converter may only enter current limited operation after the charge current has been already reduced to zero. Operating out of current limit mode ensures a maximum efficiency of the converter, maximize the current deliverable to a given load and minimizes subharmonics in the output current and voltage, thereby minimizing interference with other system component.

Abstract: Method and apparatus are disclosed for electronic simulation of a potentiometer, and for providing a potentiometric output voltage that is representative of a parameter. The invention also teaches a non-contact type of sensor apparatus producing an output voltage that is indicative of a value of a sensed physical parameter. Electrical characteristics of a potentiometer are simulated by implementing a novel combination of analog and digital circuit techniques. Some of these characteristics include low input current, wide power supply voltage range, and an output voltage range that includes the power supply voltages. The present invention also teaches a sensor comprising electronically simulated potentiometer circuitry and a non-contact sensing element.

Abstract: The invention relates to an arrangement and a method for limiting the input power of a power supply appliance (1) fitted between a power source (2) and a load (3). The arrangement according to the invention comprises a power supply appliance (1) fitted between a power source (2) and the load to be supplied (3), which power supply appliance (1) is fitted to limit its input power on the basis of the status of the aforementioned power source (2).

Abstract: A method of and system for controlling the inrush current generated in a MOSFET of an inrush current control system, wherein the MOSFET includes a source, gate and drain. The dV/dt at the drain of the MOSFET is controlled so as to set the inrush current level as a function of dV/dt, independent of current limit without requiring a separate capacitor connected between the gate and drain of the MOSFET so that the MOSFET can turn on and off more quickly.

Abstract: An electronic device with several charging modes includes a transmission module, a central control module, an interface module, and a power module. The transmission module includes a first connecting terminal for connecting an external electronic product and produces a corresponding identification signal according to each external electronic product. The central control module supplies different power supplies to each external electronic product and produces a corresponding power setting signal. The interface module obtains a different power supply for each external electronic product through the transmitting module and converts each different power supply into a same charging power according to the power setting signal and identification signal. The power is stored in the power module to charge the power module, so that the electronic device just needs a transmitting module to obtain the power from any external electronic product, and thus greatly improve the convenience of charging the electronic device.

Abstract: A system and method that analyzes at least one aspect of the power grid for demand response in order to reduce feeder circuit losses is provided. The system and method may use a demand response model to select one or more factors for the demand response, such as selecting a subset of customers for demand response from a larger pool of available demand response customers. The demand response model may include a grid structure component, such as an indication of the particular customer's position in the grid and a dynamic operation component, such as a real-time measurement of current in the feeder circuit. By using the demand response model, feeder circuit losses may thereby reduced.

Abstract: An under voltage lock out circuit which monitors an input voltage and executes a predetermined sequence when the input voltage satisfies a predetermined condition may include a voltage comparison unit which compares the input voltage and a predetermined threshold voltage, and outputs a comparison signal; a logic circuit which receives the comparison signal output from the voltage comparison unit and a start-up signal instructing start-up of an equipment mounted with the under voltage lock out circuit, and asserts a sequence control signal when start-up is instructed by the start-up signal in a state the input voltage is higher than the threshold voltage; and a sequence circuit which executes a predetermined sequence when the sequence control signal is asserted, wherein the predetermined threshold voltage is switched according to the sequence control signal.

Abstract: A disclosed operation control method of a charge pump circuit for boosting an input voltage to a desired magnitude in the range between the input voltage and twice the input voltage and outputting the boosted voltage. The method includes the steps of (a) during a charging period, charging, with the input voltage, one or more of the capacitors connected in series by selectively turning on one or more of the first switches in accordance with the desired voltage magnitude, turning on the third switch, and selectively turning on the second switch or one of the fourth switches; and (b) during a discharging period, turning off the third switch and the second switch or the fourth switch having been turned on; selectively turning on one or more of the first switches; and turning on one or more fourth and the fifth switches.