[ICHIKI, Satoru 一木　智, SHIMOMUGI, Takuya 下麥　卓也, ARISAWA, Koichi 有澤　浩一, UEMURA, Keisuke 植村　啓介, IWAZAKI, Kenji 岩崎　憲嗣] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 This motor drive device (100) is provided with: a reactor (2); a converter circuit (3) which converts an AC first voltage outputted from an AC power supply (1) to a DC voltage; a capacitor (4) which smooths a second voltage, which is a voltage on the DC side of the converter circuit (3); an inverter circuit (18) which converts the DC power stored in the capacitor (3) to AC power; an overcurrent determination unit (11) which determines whether or not the first current is an overcurrent on the basis of the detected value of the AC first current flowing between the AC power supply and the converter circuit; and an overcurrent determination unit (12) which determines whether or not the second current is an overcurrent on the basis of the detected value of the DC second current flowing between the converter circuit (3) and the capacitor (4). The converter circuit (3) stops operation if either of the overcurrent detection units (11, 12) detects overcurrent, and the inverter circuit (18) stops operation if either of the overcurrent determination units (11, 12) determines overcurrent.

[ICHIKI, Satoru 一木　智, SHIMOMUGI, Takuya 下麥　卓也, ARISAWA, Koichi 有澤　浩一, UEMURA, Keisuke 植村　啓介, IWAZAKI, Kenji 岩崎　憲嗣] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 A DC power source device (100) is provided with: a reactor (2) that is connected at one end to an AC power source (1); a bridge circuit (3) that is connected to the other end of the reactor and that converts a first AC voltage outputted from the AC power source into a DC voltage; a current detector (6) that detects an AC current flowing between the AC power source and the bridge circuit. The reactor has a property that causes an inductance value to become lower in accordance with an increase in the AC current, and causes, when the AC current exceeds a first current, the inductance value of the reactor to become less than 1/3 of the inductance value obtained when a current is not flowing through the reactor. The bridge circuit is actively operated when the detected value of the AC current is equal to or larger than the first current, and is passively operated when the detected value of the AC current is lower than the first current. A DC power source device (100) is provided with: a reactor (2) that is connected at one end to an AC power source (1); a bridge circuit (3) that is connected to the other end of the reactor and that converts a first AC voltage outputted from the AC power source into a DC voltage; a current detector (6) that detects an AC current flowing between the AC power source and the bridge circuit. The reactor has a property that causes an inductance value to become lower in accordance with an increase in the AC current, and causes, when the AC current exceeds a first current, the inductance value of the reactor to become less than 1/3 of the inductance value obtained when a current is not flowing through the reactor. The bridge circuit is actively operated when the detected value of the AC current is equal to or larger than the first current, and is passively operated when the detected value of the AC current is lower than the fi

[ICHIKI, Satoru 一木　智, TANAKA, Akito 田中　章斗, SUZUKI, Daisuke 鈴木　大介, KUTSUKI, Tomohiro 沓木　知宏, SAKAI, Akira 酒井　顕] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 The present invention is provided with: a rectifier circuit 2 that rectifies AC voltage; a converter main circuit 3 connected to the output side of the rectifier circuit 2; a smoothing capacitor 4 that smoothes the DC voltage output by the converter main circuit 3; and a control unit 5 that controls the operation of the converter main circuit 3. The converter main circuit 3 has: a switching element 9; a gate drive circuit 10 that performs on/off drive of the switching element 9; a backflow prevention diode 12 connected between the switching element 9 and the smoothing capacitor 4; and a photocoupler 11 that transmits the on/off operation signal for the switching element 9 to the gate drive circuit 10. The control unit 5, by outputting the on/off operation signal to the photocoupler 11, is able to reduce malfunctions due to the effect of electromagnetic noise, is also able cut costs for an isolated power supply, a noise countermeasure component, etc., and is also able to shrink the substrate area. The present invention is provided with: a rectifier circuit 2 that rectifies AC voltage; a converter main circuit 3 connected to the output side of the rectifier circuit 2; a smoothing capacitor 4 that smoothes the DC voltage output by the converter main circuit 3; and a control unit 5 that controls the operation of the converter main circuit 3. The converter main circuit 3 has: a switching element 9; a gate drive circuit 10 that performs on/off drive of the switching element 9; a backflow prevention diode 12 connected between the switching element 9 and the smoothing capacitor 4; and a photocoupler 11 that transmits the on/off operation signal for the switching element 9 to the gate drive circuit 10. The control unit 5, by outputting the on/off operation signal to the photocoupler 11, is able to reduce malfunctions due to the effect of electromagnetic noise, is also able cut costs for an isolated power supply, a noise countermeasure component, etc., and is also able to shrink the substrate area.

[KUSUNOKI, Naoto 楠　直人, KUBOTA, Shunsuke 久保田　俊介, ICHIKI, Satoru 一木　智, UEMURA, Keisuke 植村　啓介] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 A power conversion device (1) equipped with a rectifier (4) for converting AC voltage supplied from an AC power source (51) to DC voltage, an inverter (8) for converting the output from the rectifier (4) into an alternating current, and a first smoothing capacitor (6) and a second smoothing capacitor (7) which charge by smoothing the output from the rectifier (4), and are connected in parallel to one another between the rectifier (4) and the inverter (8). The power conversion device (1) is further equipped with: an inrush current prevention circuit (12) which suppresses the inrush current to the rectifier (4) and is configured in a manner such that a first relay (2) and an inrush current prevention element (3) for suppressing the inrush current are connected in parallel to one another on the alternating current input side of the rectifier (4); a second relay (10), which is connected in series to the second smoothing capacitor (7); and a control unit (11) for controlling the first relay (2) and the second relay (10). A power conversion device (1) equipped with a rectifier (4) for converting AC voltage supplied from an AC power source (51) to DC voltage, an inverter (8) for converting the output from the rectifier (4) into an alternating current, and a first smoothing capacitor (6) and a second smoothing capacitor (7) which charge by smoothing the output from the rectifier (4), and are connected in parallel to one another between the rectifier (4) and the inverter (8). The power conversion device (1) is further equipped with: an inrush current prevention circuit (12) which suppresses the inrush current to the rectifier (4) and is configured in a manner such that a first relay (2) and an inrush current prevention element (3) for suppressing the inrush current are connected in parallel to one another on the alternating current input side of the rectifier (4); a second relay (10), which is connected in series to the second smoothing capacitor (7); and a control unit (11) for controlling the first relay (2) and the second relay (10).

[IIDA, Takeshi 飯田　岳秋, ICHIKI, Satoru 一木　智, SUZUKI, Daisuke 鈴木　大介, TAKAHARA, Takaaki ▲高▼原　貴昭] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 A motor drive device (1) comprises: a rectification circuit (10); a smoothing capacitor (12) that smoothens an output voltage outputted from the rectification circuit (10); an inverter (13) that has a plurality of switching elements (Q1, Q2, Q3, Q4, Q5, Q6), that converts an inputted DC voltage into an AC voltage, and that outputs the AC voltage to windings (Lu, Lv, Lw) of a motor (14); and a control unit (15) that has a current detection unit (15d) for detecting the magnitude of output current outputted from the rectification circuit (10) and a drive unit (15a) that outputs a signal to the switching elements (Q1, Q2, Q3, Q4, Q5, Q6) to cause the same to perform a switching operation. The smoothing capacitor (12) is a film capacitor, and sets the current to be inputted to the inverter (13) greater when the output current is greater during restrained energization in which current is passed through the windings (Lu, Lv, Lw) while rotation of the motor (14) is stopped.

[SUZUKI, Motoya 鈴木　元哉, IWAZAKI, Kenji 岩崎　憲嗣, ICHIKI, Satoru 一木　智, ARISAWA, Koichi 有澤　浩一] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 This power conversion device (120) has a converter circuit (10) for converting AC voltage output from an AC power supply (1) to DC voltage. The converter circuit (10) has unit converters (100a-100d). The power conversion device (120) generates a reference duty on the basis of detected values from a current detector (73) and a voltage detector (72) and also generates a pulse width modulation signal on the basis of the result of comparison between a corrected duty obtained by correcting the reference duty and a carrier signal. When a first reference duty in a first carrier cycle and a second reference duty in a second carrier cycle that is the cycle next to the first carrier cycle have values different from each other, the first corrected duty of a first phase in the first carrier cycle after one power supply cycle and the second corrected duty of a second phase in the first carrier cycle after the one power supply cycle are controlled to have different values. This power conversion device (120) has a converter circuit (10) for converting AC voltage output from an AC power supply (1) to DC voltage. The converter circuit (10) has unit converters (100a-100d). The power conversion device (120) generates a reference duty on the basis of detected values from a current detector (73) and a voltage detector (72) and also generates a pulse width modulation signal on the basis of the result of comparison between a corrected duty obtained by correcting the reference duty and a carrier signal. When a first reference duty in a first carrier cycle and a second reference duty in a second carrier cycle that is the cycle next to the first carrier cycle have values different from each other, the first corrected duty of a first phase in the first carrier cycle after one power supply cycle and the second corrected duty of a second phase in the first carrier cycle after the one power supply cycle are

[ICHIKI, Satoru 一木　智, KONDO, Yuya 近藤　佑弥, ARISAWA, Koichi 有澤　浩一, IWAZAKI, Kenji 岩崎　憲嗣] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 Provided is a power supply device capable of detecting the overcurrent possibly flowing through a switching element while suppressing the number of current detectors. The power supply device (100) is provided with: a converter circuit (2) having boost circuits (2a-2d) and boosting the voltage output from a power supply (1); a current detector (14) for detecting a first current flowing between the power supply (1) and the converter circuit (2); another current detectors (8, 9) for detecting second currents that are the total currents of the currents flowing through the switching elements (10-13) of the boost circuits (2a-2d); and overcurrent determination units (15a, 15b) for determining, on the basis of the detected values (IS1, IS2) of the second currents, whether the second currents are overcurrent or not. The boost circuits (2a-2d) stop the operation thereof when the determination results of the corresponding overcurrent determination units (15a, 15b) are overcurrent. Provided is a power supply device capable of detecting the overcurrent possibly flowing through a switching element while suppressing the number of current detectors. The power supply device (100) is provided with: a converter circuit (2) having boost circuits (2a-2d) and boosting the voltage output from a power supply (1); a current detector (14) for detecting a first current flowing between the power supply (1) and the converter circuit (2); another current detectors (8, 9) for detecting second currents that are the total currents of the currents flowing through the switching elements (10-13) of the boost circuits (2a-2d); and overcurrent determination units (15a, 15b) for determining, on the basis of the detected values (IS1, IS2) of the second currents, whether the second currents are overcurrent or not. The boost circuits (2a-2d) stop the operation thereof when the determination results of the corresponding overcurrent determination units (15a, 15b) are overcurrent.

[YAMAKAJI Yusuke 山梶　佑介, SUGA Ikuro 菅　郁朗, ARISAWA Koichi 有澤　浩一, ICHIKI Satoru 一木　智] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 In an electrical device (90), power is supplied from a power source (4), and communication between a separated first substrate (28) and second substrate (29) is performed via a communication line (16). The first substrate (28) is housed within a housing (22) comprising a metal part (3). The electrical device (90) comprises: a power converter circuit (45), a communication module (10), and an insulated converter circuit (12) that supplies DC power to the communication module (10), all mounted on the first substrate (28); and a communication module (11) that is mounted within the housing (22) or on the second substrate (29) within another housing (23), and communicates with the communication module (10). The electrical device (90) comprises a capacitor (17) connected between the metal part (3) of the housing (22) and a conductor to which DC power outputted from the insulated converter circuit (12) to the communication module (10) is supplied, the conductor being a negative-potential-side conductor serving as a voltage reference or a positive-potential-side conductor having a higher potential than the negative potential side.

[ICHIKI, Satoru 一木　智, HATAKEYAMA, Kazunori 畠山　和徳, ARISAWA, Koichi 有澤　浩一] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 This power conversion device (120) comprises a converter circuit (10) which converts an alternating-current voltage output from an alternating-current power supply (1) into a direct-current voltage. The converter circuit (10) includes unit converters (100a-100d). The power conversion device (120) generates a reference duty on the basis of detection values of a current detector (73) and a voltage detector (72), and generates a pulse width modulation signal for controlling a switching element on the basis of a comparison result between the reference duty and a carrier signal. In the unit converters (100a-100d), the pulse width modulation signal has one pulse within a carrier period and, in a leveling period in which the carrier period is multiplied by the number of phases, the pulse width modulation signal has pulses matching the number of phases. Furthermore, the pulses matching the number of phases in the leveling period have different phases for each carrier period. This power conversion device (120) comprises a converter circuit (10) which converts an alternating-current voltage output from an alternating-current power supply (1) into a direct-current voltage. The converter circuit (10) includes unit converters (100a-100d). The power conversion device (120) generates a reference duty on the basis of detection values of a current detector (73) and a voltage detector (72), and generates a pulse width modulation signal for controlling a switching element on the basis of a comparison result between the reference duty and a carrier signal. In the unit converters (100a-100d), the pulse width modulation signal has one pulse within a carrier period and, in a leveling period in which the carrier period is multiplied by the number of phases, the pulse width modulation signal has pulses matching the number of phases. Furthermore, the pulses matching the number of phases in the leveling period have different phases for each carrier period.

[UEMURA, Keisuke 植村　啓介, ICHIKI, Satoru 一木　智, SHIMOMUGI, Takuya 下麥　卓也, ARISAWA, Koichi 有澤　浩一, IWAZAKI, Kenji 岩崎　憲嗣] 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 〒1008310 東京都千代田区丸の内二丁目７番３号 Tokyo1008310 The present invention comprises: a bridge circuit (3) that comprises at least two or more legs with switching elements connected in series, and that converts AC voltage output from an AC power supply (1) to DC voltage; a power supply current detector (6) that detects the current of the AC power supply (1); a zero cross detection unit (9) that detects the voltage polarity of the AC power supply (1); and a control unit (10) that controls on/off of the switching element according to the output of the power supply current detector (6) and the zero cross detection unit (9), wherein the dead time of switching including the voltage polarity change of the AC power supply (1) is greater than the dead time of switching that does not include the polarity change. The present invention comprises: a bridge circuit (3) that comprises at least two or more legs with switching elements connected in series, and that converts AC voltage output from an AC power supply (1) to DC voltage; a power supply current detector (6) that detects the current of the AC power supply (1); a zero cross detection unit (9) that detects the voltage polarity of the AC power supply (1); and a control unit (10) that controls on/off of the switching element according to the output of the power supply current detector (6) and the zero cross detection unit (9), wherein the dead time of switching including the voltage polarity change of the AC power supply (1) is greater than the dead time of switching that does not include the polarity change.