Patents by Inventor Masaru Toyoda

Masaru Toyoda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11005384
    Abstract: When a load current is larger than a predetermined value, a control device of an uninterruptible power supply device controls an inverter by gate signals having a relatively high frequency and having controlled pulse widths, and when the load current is smaller than the predetermined value, the control device controls the inverter by the gate signals having a relatively low frequency and having fixed pulse widths. Therefore, when a load is a light load, switching losses occurring in IGBTs of the inverter can be decreased.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: May 11, 2021
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Publication number: 20210135488
    Abstract: An uninterruptible power supply device includes: a converter that converts AC power supplied from an AC power supply into DC power and outputs the DC power to a first power supply node; a first bidirectional chopper that outputs DC power in a lead storage device to the first power supply node when the AC power supply has a power failure; a diode connected between the first power supply node and a second power supply node; a second bidirectional chopper that supplies and receives DC power between the second power supply node and a lithium ion battery; and a controller that controls the second bidirectional chopper to charge the lithium ion battery during regenerative operation of a load and to discharge the lithium ion battery during power running operation of the load.
    Type: Application
    Filed: July 4, 2018
    Publication date: May 6, 2021
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Masaru TOYODA, Hiroki SHIGETA
  • Patent number: 10910876
    Abstract: A generation circuit is configured to generate an output voltage command value Vor* for an inverter based on a three-phase reference value Vr, a zero-phase reference value, a detected value of a current sensor, and a detected value of a voltage sensor. A compensation circuit is configured to compensate for a voltage drop in a three-phase AC line when three-phase AC power is supplied from the inverter to an AC load. A corrector is configured to correct the output voltage command value Vor* based on a compensation command value Vol. A control circuit is configured to control the inverter based on an output voltage command value Vo* corrected by the corrector.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: February 2, 2021
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Patent number: 10833528
    Abstract: An uninterruptible power supply system includes a regular uninterruptible power supply device configured to supply AC power to a load, and an auxiliary power conversion device configured to supply AC power to the load when the regular uninterruptible power supply device has a failure. The auxiliary power conversion device includes a converter and an inverter. When a DC voltage generated by the converter is higher than a lower limit voltage, the auxiliary power conversion device outputs an AC voltage having a sinusoidal wave and falling within an acceptable input voltage range of the load. When the DC voltage is lower than the lower limit voltage, the auxiliary power conversion device outputs an AC voltage having waveform distortion within an acceptable range for the load and falling within the acceptable input voltage range of the load.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: November 10, 2020
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Patent number: 10811898
    Abstract: An uninterruptible power supply device includes: an inverter configured to convert AC power from an AC power supply into DC power and output the DC power to a DC bus; a converter configured to convert the DC power received from the DC bus into AC power and supply the AC power to a load; a bidirectional chopper configured to transmit and receive DC power between the DC bus and a storage battery; a bidirectional chopper configured to transmit and receive DC power between the DC bus and a lithium ion battery; a controller configured to cause the storage battery to be charged during normal operation, and to be discharged during power failure; and a controller configured to cause the lithium ion battery to be charged when the load is performing a regenerative operation, and to be discharged when the load is performing a power running operation.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: October 20, 2020
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Patent number: 10784713
    Abstract: During power running operation of a load, a control unit turns off a switch unit to supply AC power from an uninterruptible power supply unit to the load. During regenerative operation of the load, in a case where an AC power supply can recover regenerative power, the control unit turns off the switch unit to supply the regenerative power to the AC power supply via the uninterruptible power supply unit. In contrast, in a case where the AC power supply cannot recover the regenerative power, the control unit turns on the switch unit to cause an auxiliary load unit to consume the regenerative power.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: September 22, 2020
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Patent number: 10734903
    Abstract: An uninterruptible power supply apparatus (1) drives a converter (6) at a relatively high frequency (fH) and supplies an output voltage (VDC) of the converter (6) directly to a load (23) when a load current (IL) is greater than a predetermined value (Ic), and drives the converter (6) at a relatively low frequency (fL), steps up the output voltage (VDC) of the converter (6) by a bidirectional chopper (11), and supplies the output voltage (VDC) of the converter (6) to the load (23) when the load current (IL) is smaller than the predetermined value (Ic).
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: August 4, 2020
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Publication number: 20200185960
    Abstract: A generation circuit is configured to generate an output voltage command value Vor* for an inverter based on a three-phase reference value Vr, a zero-phase reference value, a detected value of a current sensor, and a detected value of a voltage sensor. A compensation circuit is configured to compensate for a voltage drop in a three-phase AC line when three-phase AC power is supplied from the inverter to an AC load. A corrector is configured to correct the output voltage command value Vor* based on a compensation command value Vol. A control circuit is configured to control the inverter based on an output voltage command value Vo* corrected by the corrector.
    Type: Application
    Filed: September 30, 2016
    Publication date: June 11, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Publication number: 20200067417
    Abstract: When a load current is larger than a predetermined value, a control device of an uninterruptible power supply device controls an inverter by gate signals having a relatively high frequency and having controlled pulse widths, and when the load current is smaller than the predetermined value, the control device controls the inverter by the gate signals having a relatively low frequency and having fixed pulse widths. Therefore, when a load is a light load, switching losses occurring in IGBTs of the inverter can be decreased.
    Type: Application
    Filed: April 3, 2017
    Publication date: February 27, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Publication number: 20200044566
    Abstract: An uninterruptible power supply apparatus (1) drives a converter (6) at a relatively high frequency (fH) and supplies an output voltage (VDC) of the converter (6) directly to a load (23) when a load current (IL) is greater than a predetermined value (Ic), and drives the converter (6) at a relatively low frequency (fL), steps up the output voltage (VDC) of the converter (6) by a bidirectional chopper (11), and supplies the output voltage (VDC) of the converter (6) to the load (23) when the load current (IL) is smaller than the predetermined value (Ic).
    Type: Application
    Filed: April 25, 2017
    Publication date: February 6, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Publication number: 20200014241
    Abstract: A control device of an uninterruptible power supply device is configured to perform a mode selected from a normal operation mode in which a frequency of a triangular wave signal is set to a relatively high frequency and a power saving operation mode in which the frequency of the triangular wave signal is set to a relatively low frequency. Therefore, by selecting the power saving operation mode in the case of driving a load having a large acceptable range for a voltage fluctuation rate of an AC output voltage, switching losses occurring in IGBTs of an inverter can be decreased.
    Type: Application
    Filed: April 3, 2017
    Publication date: January 9, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Patent number: 10523049
    Abstract: An uninterruptible power supply apparatus supplies AC power from any one of a first inverter of a first power conversion device and a second inverter of a second power conversion device to a load, and when this inverter has a malfunction, the uninterruptible power supply apparatus supplies the AC power from the other inverter to the load. When a DC voltage provided to the second inverter is higher than a lower limit voltage, the second power conversion device outputs an AC voltage having a sinusoidal waveform and falling within an acceptable input voltage range of the load, and when the DC voltage is lower than the lower limit voltage, the second power conversion device outputs an AC voltage having waveform distortion within a range acceptable to the load and falling within the acceptable input voltage range of the load.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: December 31, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Publication number: 20190363569
    Abstract: In an uninterruptible power supply device for supplying DC power to a load, a control device is configured such that, when the load is performing power running operation, the control device turns on a second switch to supply DC power from a diode rectifier to the load, turns off a first switch, and controls a converter to suppress a harmonic current contained in an AC current flowing from an AC power supply to the diode rectifier, and when the load is performing regenerative operation, the control device turns off the second switch, turns on the first switch, and controls the converter to convert regenerative power generated by the load into AC power.
    Type: Application
    Filed: February 3, 2017
    Publication date: November 28, 2019
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Patent number: 10476300
    Abstract: An uninterruptible power supply device includes N UPS modules connected in parallel with one another between an AC power supply and a load, a current detector configured to detect a load current, and a controller configured to select n UPS modules, and an auxiliary UPS module, based on a result of detection by the current detector. Each of the n UPS modules is configured to supply, to the load, a shared current which is 1/n of the load current. The auxiliary UPS module is configured to output, to the load, a counter voltage having a value in accordance with output voltages of the n UPS modules, and thereby to stand by in a state where no current flows between the auxiliary UPS module and the n UPS modules and between the auxiliary UPS module and the load.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: November 12, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Masaru Toyoda, Kenta Hayashi, Akihiro Yamanishi
  • Publication number: 20190334376
    Abstract: During power running operation of a load, a control unit turns off a switch unit to supply AC power from an uninterruptible power supply unit to the load. During regenerative operation of the load, in a case where an AC power supply can recover regenerative power, the control unit turns off the switch unit to supply the regenerative power to the AC power supply via the uninterruptible power supply unit. In contrast, in a case where the AC power supply cannot recover the regenerative power, the control unit turns on the switch unit to cause an auxiliary load unit to consume the regenerative power.
    Type: Application
    Filed: November 11, 2016
    Publication date: October 31, 2019
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Patent number: 10461576
    Abstract: The present uninterruptible power supply apparatus includes a converter (5) configured to convert AC power into DC power; an inverter (10) configured to convert DC power into AC power and supply the converted AC power to a load (24); and a control device (18) configured to control the converter (5) and the inverter (10). The control device (18) is configured to execute a mode selected from a sinusoidal wave output mode and a waveform distortion generation mode. In the sinusoidal wave output mode, an AC voltage (VO) with a sinusoidal waveform and with no waveform distortion is supplied to the load (24). In the waveform distortion generation mode, an AC voltage (VO) with waveform distortion within an allowable range for the load (24) is supplied to the load (24).
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: October 29, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Masaru Toyoda, Masahiro Kinoshita
  • Patent number: 10418851
    Abstract: A control device controls an uninterruptible power supply device such that a transition is made to an inverter power supply mode when a power source abnormality detecting unit detects a power failure of an AC power source in a case where a commercial power supply mode is selected. The power source abnormality detecting unit computes an estimated value of the maximum value of AC input voltage, based on detected values of the instantaneous value and the phase of AC input voltage supplied to an input terminal. The power source abnormality detecting unit is configured to store temporal transition of the maximum value when the AC power source undergoes a simulated power failure and determine a power failure of the AC power source, based on comparison between temporal transition of the estimated value of the maximum value and the stored temporal transition of the maximum value during power failure.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: September 17, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda
  • Patent number: 10340730
    Abstract: An uninterruptible power supply apparatus includes a converter (5) configured to convert AC power into DC power, and an inverter (10) configured to convert DC power into AC power and supply the converted power to a load (24). The load (24) is configured to receive an AC voltage within a range of allowable input voltage to consume constant AC power. The uninterruptible power supply apparatus has maximum efficiency ? when a ratio of load capacity to rated capacity of the uninterruptible power supply apparatus is a predetermined value ?. The uninterruptible power supply apparatus further includes a control device (18) configured to control an output voltage of the inverter (10) within the range of allowable input voltage so as to increase the efficiency ?, when the ratio of the load capacity to the rated capacity is different from the predetermined value ?.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: July 2, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Masaru Toyoda, Masahiro Kinoshita
  • Publication number: 20190181677
    Abstract: An uninterruptible power supply device includes: an inverter configured to convert AC power from an AC power supply into DC power and output the DC power to a DC bus; a converter configured to convert the DC power received from the DC bus into AC power and supply the AC power to a load; a bidirectional chopper configured to transmit and receive DC power between the DC bus and a storage battery; a bidirectional chopper configured to transmit and receive DC power between the DC bus and a lithium ion battery; a controller configured to cause the storage battery to be charged during normal operation, and to be discharged during power failure; and a controller configured to cause the lithium ion battery to be charged when the load is performing a regenerative operation, and to be discharged when the load is performing a power running operation.
    Type: Application
    Filed: April 14, 2016
    Publication date: June 13, 2019
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru TOYODA
  • Patent number: 10298054
    Abstract: An uninterruptible power supply is configured to receive, together with a first load, AC power supplied from an AC power source. The uninterruptible power supply includes: a converter configured to convert AC power from the AC power source into DC power; an inverter configured to convert DC power generated by the converter or DC power in a battery into AC power to supply the converted power to a second load; a controller configured to control reactive power generated at the converter to compensate at least a part of reactive power generated at the first load; and a limiter configured to limit reactive power generated at the converter to upper limit power or lower. The upper limit power is set to a value according to the difference between the rated capacity of the uninterruptible power supply and AC power supplied to the second load.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: May 21, 2019
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Masaru Toyoda