Abstract: A method of determining whether an electrical appliance can tolerate variations in supplied electrical energy. In some embodiments, the method may include coupling the electrical appliance to a source of electrical energy, delivering electrical energy to the electrical appliance, wherein the electrical energy is delivered at a first electrical energy level, obtaining a first measurement of current consumed by the electrical appliance at the first electrical energy level, delivering electrical energy to the electrical appliance at a second electrical energy level different than the first electrical energy level, obtaining a second measurement of current consumed by the electrical appliance at the second electrical energy level, and comparing the first measurement of current to the second measurement of current.

Abstract: A voltage generating unit generates a standard output voltage and sends to a voltage output side. A voltage detection unit detects a voltage of the voltage output side and informs a voltage gain control unit. When the voltage of the voltage output side is decreasing due to a dynamic load, the voltage gain control unit is configured to control the voltage generating unit to increase a gain of a voltage generated by the voltage generating unit, and the voltage generated by the voltage generating unit is lower than the standard output voltage. Then, the voltage gain control unit is configured to control the voltage generating unit to decrease the gain of the voltage generated by the voltage generating unit, and the voltage generated by the voltage generating unit is equal to the standard output voltage.

Abstract: Consistent with an example embodiment, a method of tracking a maximum power point (MPP) of a PV (photovoltaic) system comprises a circuit with a controller controlling a DC voltage-DC voltage converter for converting an output current of the PV system; the controller further comprises a memory. The method comprises measuring a first value of a PV system voltage at an initial MPP; storing said first value in said memory; periodically sampling a power output level of said PV system, and upon detecting a change in said power output level exceeding a first threshold, reading the first value from the memory; and adjusting a duty cycle of the DC voltage-DC voltage converter until the circuit voltage matches said first value; the method further comprising fine-tuning the duty cycle of the DC voltage-DC voltage converter to a further MPP following detecting a change in said power output level exceeding a first threshold.

Abstract: Systems and methods for monitoring excitation of a generator based on a faulty status of a generator breaker are provided. According to one embodiment, a system may include a controller and a processor communicatively coupled to the controller. The processor may be configured to receive, from a contact associated with a generator breaker, a reported status of the generator breaker, receive operational data associated with one or more parameters of a generator associated with the generator breaker, and correlate the reported status of the generator breaker and the operational data. Based on the correlation, the processor may establish an actual status of the generator breaker, and, based on the actual status, selectively modify a mode of excitation of the generator.

Abstract: A power supply system comprising a power stabilization stage configured to combine a first reference signal having a first frequency range with a second reference signal having a second frequency range that is different than the first frequency range to generate a combined reference for driving a reference load. A first power supply (e.g. SMPS) is configured to generate a first output based on the first reference signal. A second power supply (e.g. linear regulator) is configured to generate a second output based on the second reference signal. A power combiner circuit is configured to combine the first output with the second output to generate a combined output for driving an output load.

Abstract: The present invention relates to a voltage boosting circuit capable of modulating duty cycle automatically, which comprises an inductor, a switching module, and a control circuit. The inductor is coupled to an input for receiving an input power. The switching module is coupled among the inductor, a ground, and an output for switching so that the input power can charge the inductor and produce charged energy, or for switching so that the charged energy of the inductor can discharge to the output and produce an output voltage. The control circuit outputs at least a control signal according to the charged energy and the output voltage for controlling the switching module to switch the inductor and provide the input power to the output, to switch the charged energy of the inductor to discharge to the output, or to switch the input power to charge the inductor.

Abstract: A method of maximum power point tracking for a photovoltaic module system is disclosed. The photovoltaic module system may comprise a photovoltaic module array comprising a plurality of identical photovoltaic modules, and the tracking method may comprise: detecting system parameters and environmental parameters of the photovoltaic module array; estimating a first voltage coefficient of one photovoltaic module according to the system parameters and the environmental parameters; estimating a plurality of second voltage coefficients of the photovoltaic module array according to the first voltage coefficient with different shading ratios; estimating a plurality of local maximum power point powers according to corresponding second voltage coefficients; and determining a whole maximum power point by comparing the local maximum power point powers with one another.

Abstract: The high accuracy pulse duty-cycle calculation hardware implementation scheme is composed of a clock generator block, digital pulse width account block, digital memory block to store pulse width in digital and digital-analog divider block with two digital-analog converters. The digital pulse width account block is used to account the two pulse width of a pulse, e.g. turn-on time TON, turn-off time TOFF, cycle time TS or other time variable in digital method. The digital memory block is used to store digital information from the digital pulse width account block until next cycle.

Abstract: A universal serial bus (USB) power supply is disclosed as including a main body (12) and a cable (24) releasably connectable with each other, the main body (12) being releasably connectable to a direct current (DC) power source and having a USB receptacle (20) electrically connectable with the DC power source. The cable (24) includes a USB plug (26) releasably connectable with the USB receptacle (20) to establish electrical connection and data communication there-between and a connector (30) electrically connected with the USB plug (26). The power supply is operable in a detached mode in which the main body (12) is out of connection with the cable (24) and in an attached mode in which the main body (12) is releasably connected with the cable (24). The power supply is adapted, when in the attached mode, to automatically change the voltage of a DC power output from the connector (30).

Abstract: In accordance with an embodiment, a circuit includes a switch coupled between a first reference terminal and a first output terminal, an inductive element coupled between an input terminal and a second output terminal, and a diode coupled between the first output terminal and the input terminal. The circuit further includes a controller coupled to a control terminal of the switch. The controller is configured to determine a switching signal based on an output signal at the second output terminal and provide the switching signal to the control terminal of the switch.

Abstract: A circuit may include a detector, a modulator, a switch, and a stabilizer. The detector may detect current supplied to an output of the circuit to generate an overcurrent signal. The modulator may modulate a pulse signal based upon the output of the circuit. The switch may control a power stage to generate the output of the circuit based upon the overcurrent signal and the pulse signal. The stabilizer may send an offset signal to the modulator. The stabilizer may generate the offset signal with a magnitude adjusted based upon the overcurrent signal, and the modulator may adjust the pulse signal based upon the offset signal.

Abstract: A control circuit (115), a control method, a DC-DC converter and an electronic device are provided. The control circuit (115) is used to control the DC-DC converter to switch its operation modes. In the control circuit (115), whether mode of the DC-DC converter is to be switched is judged according to parameters of a first duration of an active duration and a second duration of an inactive duration. Comparison of analogue values is prevented, and as a result, the use of the analogue comparator is reduced, thus the influence of the semiconductor processes on designing a controller can be reduced.

Abstract: Methods and apparatus are provided for controlling a boost converter. In one embodiment, the method includes processing an input current command through a plurality of prioritized limiting circuits to determine whether to limit the input current command and limiting the input current command to limit the boost converter when it is determined to limit the input current command. In one embodiment, the apparatus includes an energy source coupled to a boost converter that provides an output voltage responsive to a current command signal. An inverter is coupled to the boost converter to provide multiple phased currents to a multi-phase motor for a vehicle. A controller coupled to the boost converter for providing the current command signal by processing an input current command through a plurality of prioritized limiting circuits and determining whether to limit the input current command to provide the current command signal to the boost converter.

Abstract: An adjusting device of an output voltage of a switch power supply and an adjusting method are provided. The adjusting device includes a potential setting module generating a high level signal and an adjustor being connected to the potential setting module to receive the high level signal. The adjustor includes a signal emitting module and a comparison module. The signal emitting module emits a pulse drive signal to the switch power supply when receiving the high level signal. The switch power supply automatically adjusts the output voltage when receiving the pulse drive signal. The comparison module reads the output voltage, compares with a preset voltage, and adjusts the output voltage according to a comparison result. The switch power supply can stop the automatic adjustment when an output level of a switch port of the switch power supply is inverted. An integrated chip is also provided.

Abstract: A controller (306) executes a method (400) of controlling a solar power converter (20, 300) connected to receive output power from a solar power source (10). The method comprises: measuring (430) an open circuit voltage (VOC) of the solar power source; determining a short circuit current (ISC) output by the solar power source; using (440) the measured open circuit voltage (VOC) and the measured short circuit current (ISC) to determine an estimate of a voltage maximum power point (VMPP) for the solar power source corresponding to a maximum power point (MPP) for transferring the output power from the solar power source to a load; executing (450) a perturb-and-observe algorithm (500) beginning at the estimated VMPP to determine an actual VMPP for transferring the output power from the solar power source to the load; and operating (470) the solar power converter at or approximately at the actual VMPP.

Abstract: In accordance with one embodiment of the present disclosure, a multi-phase voltage regulator may comprise a plurality of phases, each phase configured to supply electrical current to one or more information handling resources electrically coupled to the voltage regulator. A controller may be electrically coupled to the plurality of phases. The controller may designate at least one of the plurality of phases as a first state phase, and designate each of the plurality of phases not designated as a first state phase as a second state phase. The controller may alternate the designation of at least two of the plurality of phases between a first state phase and a second state phase. Each first state phase may be configured to supply a first electrical current regardless of electrical current demand. Each second state phase may be configured to supply a second electrical current based on the current demand.

Abstract: A voltage converter for converting an input voltage to an output voltage is disclosed. The voltage converter includes a voltage converter circuit having a set of switches, a switch driver connected to the voltage converter circuit, a controller connected to the switch driver and the output voltage, a target output voltage connected to the controller, a control signal generated by the controller for the switch driver that includes a duty ratio based on the target output voltage and the output voltage. The switch driver is configured to apply the control signal to the set of switches and the voltage converter circuit generates the output voltage based on the duty ratio to match the target output voltage.

Abstract: An illumination system detects a peak value of a voltage of a transformer supplying an LED module by analyzing the current value of the voltage and an on-time of the voltage. Based on the detected peak value, a property of the illumination system is adjusted.

Abstract: The present disclosure provides a method for controlling a multilevel converter, the method including, detecting modulation state values and current directions of sub-modules, and designating, by one sub-module, an average number of switching for each period of an output waveform, wherein the step of designating the average number of switching includes, grouping the sub-modules according to being in ON state or in OFF state, comparing the number of sub-modules in previous ON state and the number of sub-modules in OFF state to obtain a difference therebetween, and changing a state as much as the difference, comparing a sub-module of ON state in charged state and in discharged state with a sub-module of OFF state, and changing the compared states of sub-modules of ON state and OFF state.

Abstract: A power controller controls power to a load and includes a primary conductor, a current divider, first and second current sensors, and a controller. The primary conductor carries a primary current to the load. The current divider is connected between the primary conductor and the load and includes a first conductor and a second conductor. The second conductor has a greater impedance than the first conductor. The first current sensor provides a first output representative of the primary current, and the second current sensor provides a second output representative of a secondary current in the second conductor of the current divider. The controller determines the primary current to the load based upon the first output when the primary current is less than a threshold value, and based upon the second output when the primary current is greater than the threshold value.

Abstract: The present invention relates to a voltage regulator and to a method of operating a voltage regulator that is operable in a reset mode and in a sampling mode. The voltage regulator comprises: a capacitive voltage divider having a first capacitor and a second capacitor in series with the first capacitor, wherein the capacitive voltage divider is connectable to an output of a voltage supply to activate the sampling mode, a comparator having an output connected to an input of the voltage supply, the comparator further having a first input connected to a sampling node arranged between the first capacitor and the second capacitor and the comparator having a second input connected to a reference voltage, wherein the sampling node is connectable to the reference voltage for activating the reset mode.

Abstract: A semiconductor device includes a power supply voltage level/slope detection unit configured to detect a level of a power supply voltage and a slope of a power supply voltage curve, and output a power supply voltage level/slope detection signal, a pumping voltage detection unit configured to detect a level of a pumping voltage based on a reference pumping level to output a pumping detection signal, an oscillation signal generation unit configured to generate an oscillation signal in response to the pumping detection signal and the power supply voltage level/slope detection signal, and a pumping unit configured to generate the pumping voltage by performing a charge pumping operation in response to the oscillation signal.

Abstract: Provided is a voltage regulator including a soft-start circuit having a small area and capable of suppressing an inrush current by causing a reference voltage circuit to rise gently with time. In the soft-start circuit, a capacitor is connected to an output of a reference voltage circuit driven by a constant current of a constant current circuit, and hence the soft-start circuit can raise a reference voltage gently to prevent an inrush current with a small area. After the end of a soft-start period, the constant current circuit is disconnected, and the reference voltage circuit is driven by a power source. Thus, the operation becomes stable.

Abstract: A device determines a first voltage measurement of an output of a first brick. The device further determines a second voltage measurement associated with a second brick. The first brick is larger in size than the second brick. The device ramps up an output voltage of the second brick when the second voltage measurement is less than the first voltage measurement.

Abstract: Provided is an electronic device including a power supply circuit. The power supply circuit includes: a voltage driving unit configured to pull-up drive an output node and generate an output voltage; and a driving control unit configured to receive the output voltage, disable the voltage driving unit from the time at which a divided voltage obtained by dividing the output voltage at a set ratio becomes higher than a first level, and enable the voltage driving unit from the time at which the divided voltage becomes lower than a second level, which is higher than the first level.

Abstract: Voltage regulators in a current share arrangement may provide a total current to a common load, and may be simultaneously turned on to ramp up member currents. Each voltage regulator may provide a respective member current in the current share configuration. A target current value may be determined from a cycle-averaged current value of the member currents and a voltage error value of the voltage regulator, and each member current may be ramped to the target current value instead of the cycle-averaged current value when the voltage regulators are turned on, resulting in more stable and balanced current ramping. A predictive multi-phase digital controller may therefore operate according to a target current determined based on a measured or inferred inductor current and an error voltage. Pulse-width, pulse position and pulse frequency (adding or skipping pulses) may be calculated according to the operation of the predictive multi-phase digital controller.

Abstract: A feedforward control method, which includes: determining, whether the input voltage rapidly changes or slowly changes; when the input voltage rapidly changes, determining, a first feedforward gain coefficient corresponding to the difference between a input voltage reference value and a first input voltage measurement value acquired by a high-speed low-precision analog-to-digital converter in a current sampling period; when the input voltage slowly changes, determining a second feedforward gain coefficient which is a ratio of the input voltage reference value to a second input voltage measurement value acquired by a low-speed high-precision analog-to-digital converter in the current sampling period; and using the first or the second feedforward gain coefficient as a feedforward gain coefficient of a current input voltage, multiplying the feedforward gain coefficient by an output value of a feedback loop of an output voltage, so as to control stable output of the output voltage.

Abstract: The present disclosure relates to methods, a system and a module for operating a power converter module. The power converter module comprises a voltage converter, an output circuitry and a processing circuitry operable for controlling the voltage converter. One method comprises transmitting a first status signal representing operating parameters of the voltage converter to the processing circuitry. Determining whether the first status signal of the voltage converter is acceptable. The method also comprises transmitting a second status signal representing the operating parameters of the output circuitry to the processing circuitry. The method also comprises determining if the second status signal is above a predetermined threshold value. When the second status signal is above said predetermined threshold value and the status of the voltage converter is acceptable, entering a peak output mode operating the voltage converter at maximum power dissipation.

Abstract: The present disclosure is directed to a fast load transient response power supply system using dynamic reference voltage generation. A system may comprise, for example, at least power supply circuitry, voltage reference circuitry and dynamic reference generation circuitry. The power supply circuitry may be configured to generate an output voltage (e.g., for driving a load) based on a power supply input voltage. The voltage reference circuitry may be configured to generate a reference voltage for use in controlling the generation of the output voltage. The dynamic reference generation circuitry may be configured to generate a dynamic reference voltage as the input voltage for the power supply circuitry based on the reference voltage and the output voltage.

Abstract: A control circuitry can be configured to receive an error signal indicating a difference between an output voltage of the power supply and a desired setpoint for the output voltage. According to one configuration, depending on the error signal, the control circuitry initiates switching between operating the control circuitry in a pulse width modulation mode and operating the control circuitry in a pulse frequency modulation mode to produce an output voltage. Operation of the control circuitry in the pulse frequency modulation mode during a transient condition, such as when a dynamic load instantaneously requires a different amount of current, enables the power supply to satisfy current consumption by the dynamic load. Subsequent to the transient condition, the control circuitry switches back to operation in the pulse width modulation mode.

Abstract: An adjustable output power supply with a data communications connector that at least partially complies with physical specifications of a defined data interface standard connector, such as a USB connector. The data communications connector has a number of data contacts and power contacts coupled to and providing output electrical power from a programmable power supply. A controller receives an indication of a detection of a feature of a mating connector coupled to the data communications connector, determines, based on receiving the detection, at least one resistance value between a data contact and at least one power contact, and adjusts an output voltage of the programmable power supply based on the at least one resistance value.

Abstract: A switched-mode power supply in a set of parallel-connected switched-mode power supplies is operated to (1) monitor both output current and operating temperature, and (2) auto-tune an output voltage using two-dimensional control that employs a two-dimensional function of the output current and the operating temperature. The two-dimensional function is a sharing function whose use in each of the supplies effects a coordinated sharing of both load current and operating temperature across the set of supplies. Temperature sharing includes monitoring and controlling distribution of operating temperatures across the set of supplies to reduce undesirable temperature imbalance that can cause excessive thermal stress and reduce reliability.

Abstract: The placement of fully available prime movers having a DC output at a location inside or adjacent to an inverter-based intermittently available renewable energy site is disclosed. The fully available prime movers add reliability to an unreliable energy asset that is reaching its maximum penetration within the grid due to its unpredictability and the requirement for additional spinning reserves in other parts of the grid. The present invention can provide a portion or all of the power to an intermittently available renewable power generating facility so that the power output to the power grid is dispatchable power. In particular, a method and means are disclosed to utilize high-efficiency engines operated on various fuels some of which may be non-fossil fuels to maintain a constant power output from an otherwise intermittent power generating facility.

Abstract: A circuit for testing digital-to-analog (DAC) and analog-to-digital converters (ADC) is provided. The circuit applies a code pattern having a plurality of sequential values to the digital to analog converter. A plurality of built-in test switches (BTS) couple at least one tap voltage from the DAC to a test bus and to the ADC as a variable reference input voltage. In one form, the circuit uses incremental digital codes to test for defects in a resistor string, a switch array, and a decode logic that form part of the DAC. In another form, the circuit uses the tap voltages from the DAC to test the comparators that form part of the ADC. Instead of performing time-consuming analog to digital conversions, the functionality of the above mentioned circuitry is tested by varying the code pattern around a reference point and by selecting the appropriate combination of BTS switches.

Abstract: A method and a circuit dynamically adjust a frequency of a clock signal that drives the operations of a power converter. The method includes (a) detecting a change from a predetermined value in an output voltage of the power converter; and (b) upon detecting the change, changing the frequency of the clock signal so as to restore the output voltage. The change, such as a load step-up, may be detected by comparing a feedback signal generated from the output voltage and a predetermined threshold voltage. In one implementation, changing the switching frequency is achieved in increasing (e.g., doubling) the frequency of the clock signal, as needed. The frequency of the clock signal need only be changed for a predetermined time period.

Abstract: A method for improving a power converter's efficiency comprises detecting an input voltage of a power converter, determining an operation mode of the power converter based upon the input voltage of the power converter and generating a plurality of gate drive signals based upon a damped gain control, wherein the damped gain control is configured such that an output voltage of the power converter is in a range from a tightly regulated output voltage to an unregulated output voltage.

Abstract: An apparatus for power conversion comprises a voltage transformation element, a regulating element, and a controller; wherein, a period of the voltage transformation element is equal to a product of a coefficient and a period of the regulating circuit, and wherein the coefficient is selected from a group consisting of a positive integer and a reciprocal of said integer.

Abstract: An energy saving device that is adapted to be connected to a power outlet and further connected to at least one electrical device, said electrical devices drawing power through the energy saving device, the energy saving device including testing means adapted to perform at least one installation verification test and communication means adapted to communicate a validation signal to a monitoring entity when a result of the installation verification test indicates that a correct installation has occurred.

Abstract: Providing a fast current sensor direct feedback path to a modulator for controlling switching of a switched power converter in addition to an integrating feedback path which monitors average current for control of a modulator provides fast dynamic response consistent with system stability and average current mode control. Feedback of output voltage for voltage regulation can be combined with current information in the integrating feedback path to limit bandwidth of the voltage feedback signal.

Abstract: A voltage booster allowing for increased utilization of low voltage, high current, unregulated DC power (“LVDC source”), such as, but not limited to, fuel cells, batteries, solar cells, wind turbines, and hydro-turbines. LVDC generation systems employing a variable low voltage DC-DC converter of the present disclosure may be used without a power inverter in applications requiring high voltage DC inputs and can also allow for the employment of common, low cost, reliable, low voltage energy storage chemistries (operating in the 12-48 VDC range) while continuing to employ the use of traditional inverters designed for high voltage power supplies. An embodiment of the DC boost converter includes a plurality of interleaved, isolated, full-bridge DC-DC converters arranged in a Delta-Wye configuration and a multi-leg bridge.

Abstract: A method of supplying electrical power to a load is provided. The method includes the step of providing a removable plug-in cartridge having markings related to a desired value of an electrical output of a power supply unit. The method further includes configuring the power supply unit to receive the removable plug-in cartridge such that the removable plug-in cartridge operates to set an output value of the power supply to the desired value.

Abstract: The present disclosure relates to methods and circuits to achieve a buck-boost switching regulator that allows changing operation modes without causing large output ripples during transition of operation modes Increased error amplifier output voltage range over which the converter stays in its present operating mode (buck or boost or buck-boost), resulting in hysteresis between error amplifier output voltage and output voltage). The larger the hysteresis, the smaller will be the likeliness of having to switch between modes. A first embodiment is combining masking logic applied to signals driving the switches of the switching regulator and offset feedback to outputs of the error amplifier in order to providing hysteresis to suppress operation mode bounce and to minimize ripples while a second embodiment is monitoring pulse width of PWM pulses by a pulse width checker.

Abstract: Disclosed is a dual-source converter for a hybrid power supply. The converter includes a first power circuit, a second power circuit, an auxiliary circuit, an output circuit and a closed loop circuit. The first power circuit is electrically connected to the second power circuit in series for receiving two varied voltage sources. The auxiliary circuit is configured to achieve soft switching of all switches. The closed loop circuit is configured to control the duty cycles of the first power circuit, the second power circuit and the auxiliary circuit so as to improve the efficiency of the dual-source converter.

Abstract: An ultrasonic generator is provided, in which the control system can easily be changed in accordance with a cleaning application and a cleaning process. The ultrasonic generator according to the present invention, which causes an ultrasonic transducer to oscillate a signal for ultrasonic vibration, includes a programmable multiple control circuit having a signal generation circuit for generating a signal, and an output adjustment circuit for adjusting the output of the signal from the programmable multiple control circuit, wherein the programmable multiple control circuit has a power control circuit electrically connected to the output adjustment circuit, a phase comparison circuit electrically connected to the output adjustment circuit, a frequency control circuit electrically connected to the phase comparison circuit, and a signal modulation circuit electrically connected to the frequency control circuit via the signal generation circuit.

Abstract: A safe electric power regulating circuit is connected between a power supply and a voltage boost/buck circuit to regulate the output voltage by the power supply to have a target voltage through the voltage boost/buck circuit. A switching device includes a switch unit, a first diode, and a first capacitor. The switch unit includes a first end, a second end, and a third end. The first end is connected to the power supply, and the second end is connected to the voltage boost/buck circuit. The switch unit is controlled to connect the third end to the first end or the second end. The first diode has one end connected to the first end of the switch unit. The first capacitor has one end connected to the third end of the switch unit and the other end connected to circuit ground.

Abstract: A system includes a triple modular redundant (TMR) control system comprising three controllers. Each controller of the three controllers includes a current driver system configured to detect and regulate a portion of a total current output of the TMR control system, and a universal input-output (UIO) system comprising a plurality of universal input-output (UIO) ports, wherein the universal input-output (UIO) system is configured to detect the portion of the total current output and the total current output of the TMR control system via one or more of the plurality of the UIO ports, compare the portion of the current output and the total current output of the TMR control system, and adjust the portion of the total current output according to a predetermined total current output threshold.

Abstract: An apparatus and a method to control peak current mode controlled power converter system using selective noise blanking are disclosed. The control of the peak current mode controlled power converter system using selective noise blanking is implemented by hardware, software and/or combination of both to carry out adjusting a blanking time and a blanking time period to prevent change of an output of a pulse modulated waveform generator starting at the blanking time for the blanking time period.

Abstract: DC-DC converter, wherein in a case of positive voltage generation, the controlling circuit controls the first to fourth switch circuits with the first to fourth controlling signals, thereby permitting conduction between the first node and the first reference node and conduction between the eighth node and the fourth reference node, then permitting conduction between the fourth node and the second reference node and conduction between the sixth node and the third reference node, and then permitting conduction between the second node and the first reference node.

Abstract: A power supply apparatus for applying a method of supplying a loading with an electric power within a predetermined range of a default power, which includes a driving unit, a voltage sensing unit, and a feedback control unit. The driving unit receives power from a power source, and supplies the loading with a working voltage and a working current; the voltage sensing unit detects the working voltage; the feedback control unit keeps a plurality of reference voltages, wherein each two neighboring reference voltages are defined to have a voltage section therebetween. The feedback control unit sends a current signal to the driving unit according to the working voltage and a slope parameter of the voltage section which the working voltage falls in, and the driving unit supplies the working current according to the current signal to maintain the electric power in the predetermined range of the default power.

Abstract: There is provided a power management device including a load current control unit configured to set an upper limit on a load current supplied from a connected feeding device and to control the load current on the basis of the upper limit, and a determination unit configured to, when the load current control unit has reset the upper limit to a higher value, determine if the upper limit has exceeded a current capacity of the feeding device on the basis of a voltage drop level of an input voltage. The load current control unit may reset the upper limit in increments or decrements of a predetermined value, and the load current control unit may, when the determination unit has determined that the upper limit had exceeded the current capacity of the feeding device, control the load current by resetting the upper limit to a value not exceeding the current capacity.