Abstract: A maximum power point tracking method is provided. The method includes temporarily determining a next voltage command using voltage and power measured at current and previous time points. When an increase or decrease in voltage command is continued predetermined times or more, it is decided that the next voltage command temporarily determined to be increased is decreased or that the next voltage command temporarily determined to be decreased is increased. The output voltage of a solar cell is regulated based on the decided next voltage command.

Abstract: A power control method for tracking a Maximum Power Point (MPP) in a photovoltaic system including a solar cell and a boost converter. The power control method includes finding the MPP by applying a continuous ON/OFF signal to the boost converter as a first control signal for controlling a duty ratio of the boost converter, and maintaining an operating point of the photovoltaic system at the MPP by applying a second control signal for controlling the duty ratio to the boost converter depending on a constant-voltage command. In tracking an MPP in a photovoltaic system, an MPPT algorithm may remain at the MPP, without self oscillation, improving fast dynamic characteristics upon a change in solar radiation.

Abstract: The invention relates an electrical device for providing an output depending on an electrical input. The electrical device (1) is adapted to provide a constant output, if the electrical input is in a first electrical input range, and a dependent output, if the electrical input is in a second electrical input range, wherein the dependent output depends on the electrical input. The output can therefore remain constant, even if the electrical input, which is preferentially a DC grid voltage, fluctuates within the first electrical input range. Moreover, in the second electrical input range the output can be controlled by just controlling the electrical input like the DC grid voltage, without necessarily requiring an additional control construction of the electrical device. A resistance against fluctuations of the electrical input and a controllability of the output can therefore be realized in a relatively simple way.

Abstract: A method and apparatus are provided for implementing dynamic regulator output current limiting. An input power to the regulator is measured, and the measured input power is related to a regulator output current and a regulator over current trip point, and dynamically used for providing dynamic regulator output current limiting.

Abstract: The present invention relates to a quick response power supply switching device. It also relates to a power supply network equipped with such a switch. The electrical power supply is connected to a set of blocks, the device comprises at least one switch (3) connecting the power supply (VDD) and the block (1), the value of the power supply current passing through the switch being controlled according to the difference between the power supply voltage (VDD) at the level of the other blocks and voltage threshold. The invention applies notably to all integrated circuits of recent technology in which it is important to reduce the leakage currents of the transistors in the unused circuit parts. The invention thus applies particularly to most systems powered by cell or battery and more particularly to portable telephone circuits.

Abstract: A client device manages consumption of power supplied by an electric utility to multiple power consuming devices. Power flow to the power consuming devices is selectively enabled and disabled by one or more controllable devices controlled by the client device. The client device receives a power control message from a load management server. In one embodiment, the power control message indicates at least one of an amount of electric power to be reduced and an identification of at least one controllable device to be instructed to disable a flow of electric power to one or more associated power consuming devices. Responsive to the power control message, the client device issues a power management command or instruction to one or more controllable devices under the client device's control. The power management command causes the controllable device(s) to disable a flow of electric power to at least one associated power consuming device.

Abstract: A maximum-power-point tracking device is provided for a solar electric-generation system that includes a solar battery and a DC/DC converter connected to the solar battery. The device includes a sampling module configured to detect output current and voltage values of the solar battery. A controlling module is configured to calculate a target current value according to the output current and voltage values and a preset current value, and output a controlling signal for controlling the value of a current according to the output current of the solar battery and the target current value. The device also includes a driving module configured to receive the controlling signal from the controlling module and output a driving signal to adjust a output current value of the DC/DC converter to close to the target current value and adjust an output power of the DC/DC converter.

Abstract: Example energy management systems and methods are described. In one implementation, a system includes an inverter and a combiner module coupled to the inverter. The combiner module receives DC signals from multiple DC sources and delivers a DC output signal. A control module manages a voltage and a current associated with the DC output signal delivered by the combiner module.

Abstract: A method of queuing access to a power supply shared by a set of electrical access points. The access points turn on independently from one another and thus have independent power draws. Each access point has a specific power draw when on. The on state and associated power draw of each of access point is identified, and a load duration curve for each access point is normalized (i.e., combined with load duration curve(s)) from the other access points) into a probability distribution function. The probability distribution function is a normalized load duration curve that thus accounts for a varying set of “operating states” that may occur with respect to the set of access points (when viewed collectively). Each operating state has an associated probability of occurrence. As the operating state of the set (of access points) changes, access to the power supply is selectively queued, or de-queued (if previously queued).

Abstract: A system and method for extracting power from a power source having a high internal resistance are presented. A capacitor is connected to the power source. A switch is configured to selectively connect and disconnect the capacitor from a load. A processor is configured to monitor an energy flow from the power source into the capacitor and an amount of energy in the capacitor. When the energy flow from the power source into the capacitor falls below a first threshold, the processor is configured to close the switch to dissipate energy from the capacitor to the load. When the energy in the capacitor falls below a second threshold, the processor is configured to open the switch to disconnect the capacitor from the load.

Abstract: A voltage-regulating circuit according to the present invention includes a power conversion circuit, an input voltage detecting circuit and a feedback circuit. The power conversion circuit includes at least one switch element, wherein during operation of the at least one switch element, an input voltage is converted into a transition voltage. The input voltage detecting circuit is connected to the power conversion circuit for outputting a detected voltage signal corresponding to the input voltage. The feedback circuit is connected to the power conversion circuit and the input voltage detecting circuit for generating a feedback control signal. In such way, as the input voltage is changed, the feedback circuit will adjust to make the transition voltage changed as with the change of the detected voltage signal corresponding to the input voltage.

Abstract: In one embodiment the present invention includes a circuit comprising a voltage adjust circuit and an input terminal of an electronic system. The voltage adjust circuit is coupled to receive an input voltage. The input terminal of the electronic system is coupled to receive a supply voltage from an output terminal of the voltage adjust circuit. The voltage adjust circuit makes an adjustment to the supply voltage based on a minimum voltage requirement of the electronic system. Accordingly, the leakage current supplied to the electronic system reduces, thereby saving power.

Abstract: A power supply device includes a step-down unit to step down an input voltage, a switching unit to perform switching on a stepped-down voltage obtained through the stepping down by the step-down unit so as to externally output the voltage, an output variation detection unit to detect a corresponding variation of output from the switching unit, a delay unit to delay the input voltage by a prescribed time period, a delay variation detection unit to detect a corresponding variation of a delayed voltage output from the delay unit, an addition unit to add corresponding variations of the power supply voltage and the delayed voltage respectively detected by the output variation detection unit and the delay variation detection unit, and a control unit to perform feedback control on the basis of the corresponding variations of the power supply voltage and the delayed voltage added by the addition unit.

Abstract: A method for generating an output voltage from an input voltage with a switched mode power supply at a switching frequency is provided. At the switching frequency, a transistor within a switching circuit is deactivated so as to enter into a dead time interval, where the switching circuit includes a switching node. A negative inductor current is used during the dead time interval so as to slew the switching node, where switching frequency and the input voltage are sufficiently large so as to overcome a loss incurred by using the negative inductor current.

Abstract: In general, in one aspect, a direct-current to direct-current (DC-DC) converter adapted for converting a plurality of input voltages to a plurality of output voltages, comprising: a plurality of capacitors, a plurality of inductors, and a plurality of switches, and said switches interconnect said capacitors creating a switched capacitor circuit capable of operating at one of a plurality of distinct conversion ratios, wherein said plurality of inductors provide continuous modes from the plurality of distinct ratios and selection of an overall converter mode is based on an input voltage received.

Abstract: The present disclosure is directed to an input impedance control circuit. In one embodiment, the automatic input impedance control circuit includes a circuit controller that comprises a module for calculating an impedance and a control logic module, wherein the control logic module provides a current enable signal and a current control output signal, a driver in communication with the circuit controller for receiving the current enable signal and the current control output signal, an input voltage sensing circuit in communication with the module for calculating the impedance and the control logic module and an input current sensing circuit in communication with the module for calculating the impedance.

Abstract: A mobile device may be provided that includes an input port, an adjusting device, and a voltage regulator. The input port may receive power from an alternative power source or a DC power supply. The mobile device may receive the power from the input port, adjust a power characteristic of the power, and provide the power having the adjusted power characteristic. The voltage regulator may receive the adjusted power and provide a regulated voltage to a load.

Abstract: There is provided a multi-screw chaotic oscillator circuit with simple configuration, that can use various multi-hysteresis VCCS characteristics and generate a variety of multi-screw attractors. The multi-screw chaotic oscillator circuit comprises: a linear two-port VCCS circuit 1 consisting of a set of linear VCCS circuits G1 and G2; a multi-hysteresis two-port VCCS circuit 2 consisting of a set of multi-hysteresis VCCS circuits MH1 and MH2 having multi-hysteresis characteristic; and capacitors C1 and C2 connected to each end of a circuit configured by parallel-connecting the linear two-port VCCS circuit 1 and the multi-hysteresis two-port VCCS circuit 2.

Abstract: Provided is a maximum power extraction devices including: a battery; a voltage control unit adjusting a size of a first power outputted from the battery according to a resistor selected from a plurality of resistors, and generating a compare signal according to a size difference between an operating voltage adjusting the size of the first power depending on the selected resistor and a reference voltage; a switching unit connected between the battery and a load and adjusting a size of the operating voltage according to a size difference of the compare signal in response to first and second switching control signals; a switching control unit generating the first and second switching control signals to allow a size between the operating voltage according to the compare signal and the reference voltage to be within an error range; and a maximum power control unit measuring the number of first operations obtained by counting the occurrence number of the first or second switching control signals for a predetermined

Abstract: Controlling a photovoltaic system includes providing a photovoltaic device having a variable DC voltage output and a variable DC current output. The photovoltaic device has a combination of a voltage output level and a current output level corresponding to a predetermined, desired power point. A DC power supply is connected in a parallel and/or series combination with the photovoltaic device. A DC load is connected in series to the combination of the DC power supply and the photovoltaic device such that the load is powered by the combination. A characteristic of the DC power supply is adjusted such that the voltage output and the current output of the photovoltaic device substantially match the voltage output level and the current output level corresponding to the desired power point.

Abstract: A solar power supply device includes a solar panel converting solar energy to electrical power with a DC voltage, a voltage convertor connected to the solar panel, a control unit, and a PWM signal processing unit. The voltage convertor converts the DC voltage to a power voltage to power the electrical equipment. The control unit outputs a first and a second PWM signal, and adjusts duty cycles of the first PWM signal and/or the second PWM signal by determining whether the electrical power output by the solar panel can drive the electrical equipment. The PWM signal processing unit multiplies the first PWM signal and the second PWM signal to obtain a third PWM signal, and output the third PWM signal to the voltage convertor to control the voltage convertor to output the corresponding power voltage.

Abstract: A negative voltage regulation circuit includes an operational amplifier configured to receive a feedback voltage and an input voltage, a pull-up element configured to pull-up drive a first node based on output voltage of the operational amplifier, a load element coupled between the first node and a negative voltage terminal, a pull-down element configured to pull-down drive a final negative voltage output terminal using a voltage of the negative voltage terminal based on a voltage level of the first node, and a voltage division unit coupled between the final negative voltage output terminal and a pull-up voltage terminal, and configured to generate the feedback voltage by voltage division.

Abstract: A method for tracking a power point for a power source includes calculating voltage and current errors for the power source, selecting either the voltage error or the current error, and controlling the power converter with a first control loop in response to the selected error. The voltage and current errors may be calculated in response to voltage and current targets, respectively, which may be calculated by a second control loop that implements an MPPT algorithm. The second control loop may calculate the voltage and current targets in response to which error the first control loop selects. A method for tracking a power point for a power source having multiple local power maxima includes measuring the individual voltage across one or more series-connected power elements in the power source, and controlling the power in response to the overall voltage and current as well as the individual voltage.

Abstract: Disclosed is an energy conversion apparatus. An energy conversion apparatus may comprise a control part controlling a length of a first time duration in which input current is inputted and accumulated, a length of a second time duration in which the accumulated current is provided to a load, and a length of a third time duration in which inverse current flows; and a DC-to-DC converter including an inductor, a output capacitor, and at least one switching element, wherein the input current is accumulated during the first time duration by switching the at least one switching element according to a control of the control part so as to perform input impedance matching, and the DC-to-DC convert provides a current corresponding to a difference between the accumulated current provided during the second time duration and the inverse current flowing from the output capacitor during the third time duration to the load.

Abstract: A power conversion circuit comprising a voltage estimation circuit, a current estimation circuit, and a pulse width modulation circuit. The voltage estimation circuit is configured to receive a voltage corresponding to an input of an inductor of the power conversion circuit and generate an estimate of an output voltage of the power conversion circuit based on the voltage. The current estimation circuit is configured to receive a current corresponding to a switch connected in series with the inductor and generate an estimate of an output current of the power conversion circuit based on the current. The pulse width modulation circuit is configured to produce a pulse width modulated signal based on the estimate of the output voltage and the estimate of the output current.

Abstract: In an embodiment, an apparatus may include a sense element that may measure a property such as, for example, pressure. The sense element may produce an output based on the measured property. Circuitry associated with the sense element may store a voltage that represents the output produced by the sense element. The circuitry may include, for example, a capacitor which may store the voltage. The stored voltage may include one or more parasitic components such as, for example, an offset voltage and/or voltage associated with current leakage. The circuitry may adjust the stored voltage to compensate for the parasitic components. The adjustment may occur over a series of phases of operation of the circuitry.

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: Power monitoring circuitry is provided, comprising a capacitor configured to receive a current, so as to charge the capacitor and a switching device, connected to the capacitor. The switching device is configured to periodically discharge the capacitor in response to receipt of a clock signal from a circuit being monitored. The power monitoring circuitry also comprises a comparator, configured to perform a comparison of a voltage developed by the capacitor with a threshold voltage, and to output an indication of a change in power supplied to the circuit in response to the comparison. Other embodiments are also described.

Abstract: An energy storage system (ESS) and a method thereof are disclosed. The system includes a maximum power tracking control unit changing a controlled variable for maximum power point extraction in proportion to an hourly current and power slope of the power generating unit, setting the change amount of the controlled variable to be relatively large if the hourly current and power slope is out of a predetermined hourly current and power slope range, and setting the change amount of the controlled variable to be relatively small if the hourly current and power slope is within a predetermined hourly current and power slope range, and a maximum power extracting unit extracting and converting a maximum power from the power generating unit in response to a control of the maximum power tracking control unit.

Abstract: A reception unit sequentially receives input of voltage values indicating an AC input voltage from an AC power supply. A ROM stores a power control table in which a power control parameter corresponding to the AC power supply voltage is matched with each group of the voltage values indicating the same AC power supply voltage. A decision unit determines to which group the received voltage values belong among the plurality of groups, whenever the reception unit receives the input of the voltage value and decides the group, to which a predetermined number of voltage values belongs among the plurality of voltage values sequentially received by the reception unit, among the plurality of groups using the determination result. A power control unit controls power supply according to the power control parameter matched with the decided group.

Abstract: A method is provided for mitigating hydrogen evolution within a flow battery system that includes a plurality of flow battery cells, a power converter and an electrochemical cell. The method includes providing hydrogen generated by the hydrogen evolution within the flow battery system to the electrochemical cell. A first electrical current generated by an electrochemical reaction between the hydrogen and a reactant is sensed, and the sensed current is used to control an exchange of electrical power between the flow battery cells and the power converter.

Abstract: A power supply system includes a battery and a power management system. The power management system is coupled to the battery and to an external power source that is operable to charge the battery using a first charge level. The power management system is operable to determine that a battery power level of the battery is greater than a first predetermined level that depends on a battery storage option and, in response, disable power from being supplied from the external power source such that power is supplied from the battery until the battery power level is below the first predetermined level. The power management system is also operable to determine that the battery power level of the battery is less than the first predetermined level and, in response, charge the battery with a second charge level that is less than the first charge level until the battery power level is above a second predetermined level that depends on the battery storage option.

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: Apparatus and methods for envelope tracking are disclosed. In one embodiment, a power amplifier system including a power amplifier and an envelope tracker is provided. The power amplifier is configured to amplify a radio frequency (RF) signal, and the envelope tracker is configured to control a supply voltage of the power amplifier using an envelope of the RF signal. The envelope tracker includes a buck converter for generating a buck voltage from a battery voltage and a digital-to-analog conversion (DAC) module for adjusting the buck voltage based on the envelope of the RF signal to generate the supply voltage for the power amplifier.

Abstract: A circuit for generating an output current includes a control signal generating circuit that is configured to generate a control signal. The control signal is a function of a level of an analog input voltage signal, and a level of the output current is a function of a level of an analog input current signal and the level of the analog input voltage signal.

Abstract: The present invention relates to an energy converter for converting energy received from at least one energy source, wherein the at least one energy source includes a first photovoltaic generator, wherein the energy converter is configured to be connected to a second photovoltaic generator; the energy converter further includes a sensing unit configured to sense an open circuit voltage (VPVSS) of the second photovoltaic generator; and the energy converter is configured to convert energy received from the first photovoltaic generator based on the open voltage circuit sensed by the sensing unit. Moreover, the present invention relates to an energy conversion and storage system including the energy converter and least one energy storage element.

Abstract: An electric power planning apparatus is provided. The apparatus has an initial plan creating section, a generation amount probability density distribution creating section, an economic load dispatch calculating section, and a display section. The initial plan creating section creates an initial plan based on a demand predicted value, a predicted value of a natural energy electric power source power generation output amount, and electric power source equipment data. The generation amount probability density distribution creating section creates a probability density distribution using fluctuation bands of the demand and of the natural energy electric power source power generation output amount. The economic load dispatch calculating section calculates an output allocation based on the initial plan and the probability density distribution to create a prediction distribution of a power generation output of the controllable electric power source. The display section displays the prediction distribution.

Abstract: A system manages consumption of power supplied by at least one electric utility to multiple power consuming devices. Power flow to the power consuming devices is enabled and disabled by controllable devices controlled by one or more client devices. According to one embodiment, a group of one or more client devices to which to communicate a power control message is determined. The power control message indicates at least one of an amount of electric power to be reduced and an identification of one or more controllable devices to be instructed to disable a flow of electric power to one or more associated power consuming devices. The power control message is communicated to the determined group of client devices to initiate a power reduction event. Subsequent to initiation of the power reduction event, a determination is made that at least one controllable device has prematurely exited the power reduction event.

Abstract: A direct current (DC)-to-DC conversion apparatus is provided. The provided DC-to-DC conversion apparatus is composed of two boost circuits, in which inputs of both boost circuits are connected in parallel, and outputs of both boost circuits are connected in series. Accordingly, when the provided DC-to-DC conversion apparatus is operated, the DC input power would be firstly sampled and determined, and then the operations of the first and the second switch devices disposed therein would be controlled in response to the sampled-determined result, such that both boost circuits would be respectively operated in different input conditions, for example, the input is normally-connected or the input is reverse-connected. Accordingly, regardless of the input of normal connection or the input of reverse connection, the provided DC-to-DC conversion apparatus can perform the function of DC-to-DC conversion, thereby enabling the applied product to be normally operated even the input is reverse-connected.

Abstract: A semiconductor device includes a reference voltage generation circuit to which a power source voltage is applied; an output terminal for outputting an output voltage; a determining circuit connected to the reference voltage generation circuit and the output terminal for generating the output voltage according to a determination target voltage; and a constant electric current source connected to the determining circuit and a ground potential for generating a constant electrical current.

Abstract: A device for converting power from a floating source of DC power to a dual direct current (DC) output, the device includes: positive and negative input terminals connectible to the floating source of DC power; and positive and negative, and ground output terminals connectible to the dual DC output that may feed an inverter. The inverter may be either a two or three level inverter. A charge storage device may be connected in parallel to, and charged from, the positive and negative input terminals. A resonant circuit may be also connected between the charge storage device and the dual DC output. The resonant circuit may include an inductor connected in series with a capacitor. The charge storage device may discharge through the resonant circuit by switching through to either the negative output terminal or the positive output terminal.

Abstract: Disclosed is a power supply circuit of an electric device. The power supply circuit comprises a power source configured to output a power source voltage; a power source voltage detecting circuit configured to detect the power source voltage, and to output a first voltage control signal; a leading edge delay circuit configured to receive the first voltage control signal, and to output a second voltage control signal; an electronic switch connected in series between the power source and the load, configured to turn on or turn off power supply from the power source to the load; and a slow turn-on circuit configured to receive the second voltage control signal.

Abstract: A method of controlling a photovoltaic system includes providing a photovoltaic device having a variable DC voltage output and a variable DC current output. The photovoltaic device has a combination of a voltage output level and a current output level corresponding to a maximum power point. A DC power supply is connected in a parallel and/or series combination with the photovoltaic device. A DC load is connected in series to the combination of the DC power supply and the photovoltaic device such that the load is powered by the combination. A characteristic of the DC power supply is adjusted such that the voltage output and the current output of the photovoltaic device substantially match the voltage output level and the current output level corresponding to the maximum power point or other desired power point.

Abstract: A boost converter comprises an inductance that receives an input signal. A switch controls current supplied by the inductance to a load. A power factor control module comprises a mode control module that selects an operating mode of the boost converter and a switch control module that switches the switch at a frequency. The frequency is equal to a first frequency when the mode control module selects a continuous mode and equal to a second frequency when the mode control module selects a discontinuous mode. The first frequency is greater than the second frequency.

Abstract: A power supply apparatus includes a front-stage power circuit, a bus capacitor, a standby power circuit, a standby power circuit, an auxiliary switching circuit and a controlling unit. The auxiliary switching circuit is electrically connected between the bus capacitor and the standby power circuit. The controlling unit is electrically connected with the auxiliary switching circuit and the front-stage power circuit for controlling operations of the front-stage power circuit and the auxiliary switching circuit. When the input voltage is normal but the front-stage power circuit is disabled, the auxiliary switching circuit is turned off under control of the controlling unit, so that electric energy of the input voltage is transmitted to an input terminal of the standby power circuit through the protecting circuit.

Abstract: A regulator apparatus having an input terminal and an output terminal, the regulator apparatus includes: a plurality of regulators arranged in parallel between the input terminal and the output terminal; an conversion efficiency characteristic information obtaining unit that obtains conversion efficiency characteristic information representing a characteristic of a conversion efficiency with respect to an output current with regard to each of the plurality of regulators; a memory that stores the conversion efficiency characteristic information of each of the plurality of regulators obtained by the conversion efficiency characteristic information obtaining unit; and a switching control unit that performs a switching control on the plurality of regulators based on a value of the output current output from the output terminal and the conversion efficiency characteristic information stored in the memory.

Abstract: The invention provides an analog photovoltaic power circuit with auto zero calibration, which judges whether the current trend or voltage trend has the same direction as or different direction from the power trend, and adjusts an input/output power conversion accordingly, so that an input current approaches to an optimum current corresponding to a maximum power point, in which the judgments of the current trend, voltage trend and power trend is calibrated with auto-zero circuitry.

Abstract: A power converter and an operating method therefore are disclosed. The power converter includes an output stage, an input voltage detecting unit, and a pulse width modulation (PWM) unit. The output stage is coupled between an input terminal and a ground terminal. The input voltage detecting unit is used to detect an input voltage. The PWM unit is coupled to the output stage and the input voltage detecting unit and used to provide a PWM signal to the output stage. The PWM unit adjusts an on-time of a switch conducting signal of the PWM signal according to the input voltage and a default voltage. When the input voltage is lower than the default voltage, the PWM unit increases the on-time of the switch conducting signal and a period of the PWM signal.

Abstract: One object is to provide a boosting circuit whose boosting efficiency is enhanced. Another object is to provide an RFID tag including a boosting circuit whose boosting efficiency is enhanced. A node corresponding to an output terminal of a unit boosting circuit or a gate electrode of a transistor connected to the node is boosted by bootstrap operation, so that a decrease in potential which corresponds to substantially the same as the threshold potential of the transistor can be prevented and a decrease in output potential of the unit boosting circuit can be prevented.

Abstract: In a power supply device 1 including a switching element 12 and a control section 11 configured to control the switching element 12, the control section 11 receives an input of a first signal fluctuating according to an output voltage of the power supply device 1 and fixed with respect to an input voltage of the power supply device 1 and a second signal, the amplitude of which fluctuates according to the input voltage of the power supply device 1, and controls ON or OFF of the switching element 12 according to time until a value of the second signal reaches a value of the first signal.