Abstract: An electrified vehicle includes: a power storage device; an electric motor configured to drive a drive wheel; a drive device configured to drive the electric motor by using electric power in the power storage device; relays configured to connect or disconnect the power storage device and the drive device; a converter connected to power lines between the relays and the drive device; and a control device configured to activate the converter or stop the converter when a voltage is applied to the power lines to which the converter is connected.

Abstract: A charge and discharge system capable of being charged and discharged from and to an external device includes a charge and discharge circuit, a switching system and a controller. The charge and discharge circuit converts electric power from an inlet to direct-current power compatible with an electrical storage device and converts direct-current power of the electrical storage device to electric power that is discharged from an outlet. The switching system connects the charge and discharge circuit to the inlet or to the outlet. The controller determines that the switching system has a failure on condition that an alternating-current voltage has been detected at the inlet and an alternating-current voltage has been detected at the outlet, and disable charging and discharging.

Abstract: A DC-DC converter includes a synchronous rectification converter that converts electric power, a voltage detection circuit that detects a voltage proportional to an output voltage of the converter, a converter controller that compares a detection voltage detected by the voltage detection circuit with a reference voltage and controls an operation of the converter to provide a constant or substantially constant voltage of the detection voltage, and a command processor that sets, in a case where a target voltage command value input from an ECU is lower than a voltage value of the output voltage of the converter, a voltage value of the reference voltage to be equal or substantially equal to a voltage value of the detection voltage.

Abstract: An abnormality determiner turns OFF a third switch and controls a converter controller to stop operating in a case where a voltage value detected by a voltage detector during a normal mode exceeds a first threshold value. The abnormality determiner determines that a first switch has an abnormality in a case where the voltage value exceeds a second threshold value in a state where the converter controller is stopped. The abnormality determiner controls the converter controller to operate in a case where the voltage value is equal to or smaller than the second threshold value in a state where the converter controller is stopped. The abnormality determiner determines that the converter controller has an abnormality in a case where the voltage value exceeds a third threshold value in a state where the converter controller is operated.

Abstract: A DC-DC converter includes a synchronous rectification converter that converts electric power, a voltage detection circuit that detects a voltage proportional to an output voltage of the converter, a converter controller that compares a detection voltage detected by the voltage detection circuit with a reference voltage and controls an operation of the converter to provide a constant or substantially constant voltage of the detection voltage, and a command processor that sets, in a case where a target voltage command value input from an ECU is lower than a voltage value of the output voltage of the converter, a voltage value of the reference voltage to be equal or substantially equal to a voltage value of the detection voltage.

Abstract: An abnormality determiner turns OFF a third switch and controls a converter controller to stop operating in a case where a voltage value detected by a voltage detector during a normal mode exceeds a first threshold value. The abnormality determiner determines that a first switch has an abnormality in a case where the voltage value exceeds a second threshold value in a state where the converter controller is stopped. The abnormality determiner controls the converter controller to operate in a case where the voltage value is equal to or smaller than the second threshold value in a state where the converter controller is stopped. The abnormality determiner determines that the converter controller has an abnormality in a case where the voltage value exceeds a third threshold value in a state where the converter controller is operated.

Abstract: In a switching power supply apparatus, a magnitude of an output current of a first converter, which has been detected in a state in which a second converter is stopped, is transmitted to a measurement tool and a magnitude of an output current of the second converter, which has been detected in a state in which the first converter is stopped, is transmitted to the measurement tool. Correction values determined by the measurement tool based on transmission contents are received and stored in a memory. A magnitude of the output current which is used for PWM control of the first converter and a magnitude of the output current which is used for PWM control of the second converter are respectively corrected with the correction values.

Abstract: In a switching power-supply apparatus that controls magnitudes of output voltages of respective converters connected in parallel to be equal to a target voltage value, only a selected one of the converters is made to operate. In this state, correction values generated by the respective converters are received and stored in memory. Droop characteristics generated for the respective converters are corrected using the correction values. Accordingly, a switching power-supply apparatus and a droop characteristic correction method capable of correcting variations in droop characteristics generated for respective power converters are provided.

Abstract: In a switching power supply apparatus, a magnitude of an output current of a first converter, which has been detected in a state in which a second converter is stopped, is transmitted to a measurement tool and a magnitude of an output current of the second converter, which has been detected in a state in which the first converter is stopped, is transmitted to the measurement tool. Correction values determined by the measurement tool based on transmission contents are received and stored in a memory. A magnitude of the output current which is used for PWM control of the first converter and a magnitude of the output current which is used for PWM control of the second converter are respectively corrected with the correction values.

Abstract: In a switching power-supply apparatus that controls magnitudes of output voltages of respective converters connected in parallel to be equal to a target voltage value, only a selected one of the converters is made to operate. In this state, correction values generated by the respective converters are received and stored in memory. Droop characteristics generated for the respective converters are corrected using the correction values. Accordingly, a switching power-supply apparatus and a droop characteristic correction method capable of correcting variations in droop characteristics generated for respective power converters are provided.

Abstract: A power supply system includes a plurality of power supply apparatuses whose inputs and outputs are respectively connected in parallel with one another. The output of each of the plurality of power supply apparatuses is wired-OR connected to a synchronization pulse bus line in an open collector structure or an open drain structure. The plurality of power supply apparatuses each include a synchronization pulse generator generating a synchronization pulse for synchronization of a switching cycle, and a switching control circuit, connected to the synchronization pulse bus line, performing switching control of a switch device in synchronization with a signal of the synchronization pulse bus line. There is no distinction between a master power supply apparatus and a slave power supply apparatus in the plurality of power supply apparatuses. Further, generation of noise due to a transmission line for a synchronization signal is avoided.

Abstract: A switching power supply apparatus includes a step-down converter that steps down an input current by turning on/off switching elements, a switching element electrically connected between the step-down converter and voltage outputs, and a microcontroller. An input-side resistor voltage dividing circuit and an output-side resistor voltage dividing circuit including elements with the same or similar specifications are electrically connected to the input and output of the switching element, respectively. The microcontroller stores coefficients of an expression which have been externally calculated according to a voltage detected by the output-side resistor voltage dividing circuit and a voltage detected at the voltage output portions. The microcontroller corrects a measurement value of an intermediate bus voltage detected by the input-side resistor voltage dividing circuit according to an expression and the stored coefficients.

Abstract: A switching power supply apparatus includes a step-down converter that steps down an input current by turning on/off switching elements, a switching element electrically connected between the step-down converter and voltage outputs, and a microcontroller. An input-side resistor voltage dividing circuit and an output-side resistor voltage dividing circuit including elements with the same or similar specifications are electrically connected to the input and output of the switching element, respectively. The microcontroller stores coefficients of an expression which have been externally calculated according to a voltage detected by the output-side resistor voltage dividing circuit and a voltage detected at the voltage output portions. The microcontroller corrects a measurement value of an intermediate bus voltage detected by the input-side resistor voltage dividing circuit according to an expression and the stored coefficients.

Abstract: A power supply system includes a plurality of power supply apparatuses whose inputs and outputs are respectively connected in parallel with one another. The output of each of the plurality of power supply apparatuses is wired-OR connected to a synchronization pulse bus line in an open collector structure or an open drain structure. The plurality of power supply apparatuses each include a synchronization pulse generator generating a synchronization pulse for synchronization of a switching cycle, and a switching control circuit, connected to the synchronization pulse bus line, performing switching control of a switch device in synchronization with a signal of the synchronization pulse bus line. There is no distinction between a master power supply apparatus and a slave power supply apparatus in the plurality of power supply apparatuses. Further, generation of noise due to a transmission line for a synchronization signal is avoided.

Abstract: A switching power supply apparatus includes a voltage step-up converter that increases input voltage in response to turning on and off of a switching element, a transformer including a primary winding and a secondary winding and the primary winding of which is connected to the output of the voltage step-up converter, a microcontroller that controls the turning on and off of the switching element, an input voltage detection circuit that detects input voltage of the microcontroller, and an intermediate bus voltage detection circuit that detects intermediate bus voltage from the microcontroller. The input voltage detection circuit and the intermediate bus voltage detection circuit are circuits including elements having the same specifications. The microcontroller controls the turning on and off of the switching element based on a result of calculation from voltage values detected by the input voltage detection circuit and the intermediate bus voltage detection circuit.

Abstract: A resonant converter circuit generates an output voltage from an input voltage by switching first and second FETs. A subsequent-stage switching control circuit alternately subjects the first and second FETs in the resonant converter circuit to on/off control with a fixed on-duty ratio and a fixed switching frequency. A boost converter circuit includes an inductor, a smoothing capacitor, and a third FET arranged to switch the energization of the inductor. A previous-stage switching control circuit subjects the third FET in the boost converter circuit to on/off control with a controlled on-duty ratio, and adjusts an output voltage to the resonant converter circuit.

Abstract: A resonant capacitor and an inductor are connected in series between a primary winding of a transformer and a second switching element. A first rectifying and smoothing circuit including a first rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a first secondary winding of the transformer, and takes out a first output voltage. A second rectifying and smoothing circuit including a second rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a second secondary winding of the transformer, and takes out a second output voltage. A control circuit controls an on-time of a first switching element and an on-time of the second switching element in accordance with the first output voltage and the second output voltage, respectively.

Abstract: A switching power supply apparatus includes a voltage step-up converter that increases input voltage in response to turning on and off of a switching element, a transformer including a primary winding and a secondary winding and the primary winding of which is connected to the output of the voltage step-up converter, a microcontroller that controls the turning on and off of the switching element, an input voltage detection circuit that detects input voltage of the microcontroller, and an intermediate bus voltage detection circuit that detects intermediate bus voltage from the microcontroller. The input voltage detection circuit and the intermediate bus voltage detection circuit are circuits including elements having the same specifications. The microcontroller controls the turning on and off of the switching element based on a result of calculation from voltage values detected by the input voltage detection circuit and the intermediate bus voltage detection circuit.

Abstract: There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.

Abstract: In a switching power supply apparatus, a resonant capacitor and an inductor are connected in series between a primary winding in a transformer and a second switching element. A first rectifier smoothing circuit including a diode and a capacitor rectifies and smoothes a voltage occurring at a first secondary winding in the transformer during an on period of a first switching element to extract a first output voltage. A second rectifier smoothing circuit including a diode and a capacitor rectifies and smoothes a voltage occurring at a second secondary winding in the transformer during an on period of the second switching element to extract a second output voltage. A control circuit controls an on time of the first switching element and an on time of the second switching element on the basis of the first output voltage and the second output voltage.