Abstract: A power supply device includes: a power supply mounted in an apparatus; a conversion module including a plurality of conversion units configured to perform voltage conversion of power supplied by the power supply, the plurality of conversion units being electrically connected in parallel to each other; a selection unit that selects one of a plurality of patterns indicating a combination of the conversion units performing the voltage conversion for each operation number, which is the number of the conversion units performing the voltage conversion; and a control unit that controls the conversion module such that the conversion unit indicated by the pattern selected by the selection unit performs the voltage conversion. The selection unit changes the selected pattern with an operation on the switch. In the plurality of patterns, the combination of the conversion units performing the voltage conversion in at least one of the operation numbers is different.

Abstract: A power supply device includes: a power supply; a conversion module including a plurality of conversion units configured to perform voltage conversion of power supplied by the power supply, the plurality of conversion units being electrically connected in parallel to each other; and a change unit that an operation number, which is the number of the conversion units performing the voltage conversion. The change unit prohibits a change to an operation number in which current imbalance occurs between the conversion units performing the voltage conversion.

Abstract: A power supply device includes: a power supply; a conversion module including a plurality of conversion units configured to perform voltage conversion of power supplied by the power supply; a change unit that an operation number, which is the number of the conversion units performing the voltage conversion; and a control unit that supplies a control signal having a predetermined duty ratio to the conversion unit and controls the conversion module. When the change unit changes the operation number, the control unit gradually increases a first duty ratio, which is a duty ratio of the control signal supplied to a conversion unit for starting or stopping the voltage conversion to a second duty ratio, which is a duty ratio of the control signal supplied to a conversion unit for continuously performing the voltage conversion, at a predetermined change rate, or gradually decreases the first duty ratio to zero.

Abstract: A power supply system includes a power supply, a converter, and a processor. The converter converts voltage of the electric power supplied from the power supply. The processor is configured to generate a first control signal to control the converter to output a target voltage or a target current via a feedback control based on the first control signal. The processor is configured to generate a second control signal to detect a state of the power supply. The processor is configured to combine the first control signal and the second control signal to control the converter.

Abstract: A voltage conversion device can smoothly switch between a state of performing voltage control and a state of performing current control while maintaining the stability of operation of a voltage conversion unit. A control unit (10) of the voltage conversion device (1) selectively switches the control mode of the voltage conversion unit (3) to a current control mode or a voltage control mode and performs a control process of each control mode. In the voltage control mode, the control unit (10) determines a target current for voltage control according to a voltage deviation and performs the same feedback control process as the current control mode by using the target current to control the voltage conversion unit.

Abstract: A power supply system capable of achieving size reduction, weight reduction, or cost reduction while securing sufficient performance is provided. A voltage conversion unit (3) of a power supply system (A1) includes a plurality of voltage conversion parts (15a1 to 15b2) and is configured so that power of both a first power supply (1) and a second power supply (2) can be input to the voltage conversion parts (15b1 and 15b2), and the first power supply (1) can input power to a larger number of voltage conversion parts (15a1, 15a2, 15b1, and 15b2) than the second power supply (2).

Abstract: A voltage conversion device can smoothly switch between a state of performing voltage control and a state of performing current control while maintaining the stability of operation of a voltage conversion unit. A control unit (10) of the voltage conversion device (1) selectively switches the control mode of the voltage conversion unit (3) to a current control mode or a voltage control mode and performs a control process of each control mode. In the voltage control mode, the control unit (10) determines a target current for voltage control according to a voltage deviation and performs the same feedback control process as the current control mode by using the target current to control the voltage conversion unit.

Abstract: A voltage conversion device can selectively switch between and perform voltage control and current control of a voltage conversion unit in a suitable manner in which output characteristics of a power source are reflected. A control unit (10) of the voltage conversion device (1) selectively switches the control mode of the voltage conversion unit (3) to a current control mode or a voltage control mode on the basis of current-voltage characteristics of the power source (2) and performs a control process of each control mode. The power source (2) has current-voltage characteristics such that the output voltage changes according to the output current and such that a rate of change of the output voltage with respect to a change of the output current changes according to the output current.

Abstract: A power supply system includes a power supply, a converter, and a processor. The converter converts voltage of the electric power supplied from the power supply. The processor is configured to generate a first control signal to control the converter to output a target voltage or a target current via a feedback control based on the first control signal. The processor is configured to generate a second control signal to detect a state of the power supply. The processor is configured to combine the first control signal and the second control signal to control the converter.

Abstract: A power supply system includes a power supply, a conversion module, and a processor. The conversion module includes conversion units to convert, based on a first control signal, voltage of electric power supplied from the power supply. The conversion units are electrically connected in parallel. The processor is configured to change a number of operating conversion unit among the conversion units. The processor is configured to generate the first control signal to generate a DC component in the electric power output from the power supply. The processor is configured to generate a second control signal to detect a state of the power supply. An AC component is generated according to the second control signal in the electric power output from the power supply such that the AC component has an amplitude based on the number of operating conversion unit.

Abstract: A power supply device includes a power supply, a conversion module, and an electric current sensor, and circuitry. The power supply is to output a voltage that varies in accordance with an amount of electric power output from the power supply. The conversion module includes voltage converters electrically connected in parallel to convert the voltage to a target voltage. The electric current sensor is to detect current supplied from the power supply to the conversion module. The circuitry is configured to determine a number of operating voltage converters among the voltage converters, which are to actually convert the voltage, based on the current detected by the electric current sensor, the voltage, and a representative voltage representing a target range within which the target voltage is included.

Abstract: A semiconductor device includes at least one arm series circuit. The at least one arm series circuit includes an upper arm, a lower arm, an insulating substrate, a positive terminal, a negative terminal, an upper arm control terminal, a lower arm control terminal, and an insulating member. The lower arm is connected to the upper arm in series. Each of the upper arm and the lower arm includes a switching element and a diode connected in anti-parallel to the switching element. The insulating substrate is disposed on ground. The positive terminal is provided on the insulating substrate. The negative terminal is provided on the insulating substrate. The upper arm control terminal is provided on the insulating substrate. The lower arm control terminal is provided adjacent to the negative terminal on the insulating substrate.

Abstract: A semiconductor device includes at least one arm series circuit. The at least one arm series circuit includes an upper arm, a lower arm, an insulating substrate, a positive terminal, a negative terminal, an upper arm control terminal, a lower arm control terminal, and an insulating member. The lower arm is connected to the upper arm in series. Each of the upper arm and the lower arm includes a switching element and a diode connected in anti-parallel to the switching element. The insulating substrate is disposed on ground. The positive terminal is provided on the insulating substrate. The negative terminal is provided on the insulating substrate. The upper arm control terminal is provided on the insulating substrate. The lower arm control terminal is provided adjacent to the negative terminal on the insulating substrate.