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    Systems and methods for isolated low voltage energy storage for data centers
    11.
    发明授权
    Systems and methods for isolated low voltage energy storage for data centers 有权

    公开(公告)号：US11424677B2

    公开(公告)日：2022-08-23

    申请号：US16890856

    申请日：2020-06-02

    Applicant: Inertech IP LLC

    Inventor： Subrata K. Mondal

    IPC: H02J7/00 ,  H02M3/155 ,  H02M7/527 ,  H02M1/04 ,  H02M1/08 ,  H02J9/00 ,  H02M7/487 ,  H02M3/158 ,  H02M3/335 ,  H02J9/06 ,  H02M1/00

    Abstract: Systems and methods of this disclosure use low voltage energy storage devices to supply power at a medium voltage from an uninterruptible power supply (UPS) to a data center load. The UPS includes a low voltage energy storage device (ultracapacitor/battery), a high frequency (HF) bidirectional DC-DC converter, and a multi-level (ML) inverter. The HF DC-DC converter uses a plurality of HF planar transformers, multiple H-bridge circuits, and gate drivers for driving IGBT devices to generate a medium DC voltage from the ultracapacitor/battery energy storage. The gate drivers are controlled by a zero voltage switching (ZVS) controller, which introduces a phase shift between the voltage on the primary and secondary sides of the transformers. When the primary side leads the secondary side, the ultracapacitor/battery discharges and causes the UPS to supply power to the data center, and when the secondary side leads the primary side, power flows from the grid back to the UPS, thereby recharging the ultracapacitor/battery.

    SYSTEMS AND METHODS FOR CONTROLLING MULTI-LEVEL DIODE-CLAMPED INVERTERS USING SPACE VECTOR PULSE WIDTH MODULATION (SVPWM)
    13.
    发明申请
    SYSTEMS AND METHODS FOR CONTROLLING MULTI-LEVEL DIODE-CLAMPED INVERTERS USING SPACE VECTOR PULSE WIDTH MODULATION (SVPWM) 有权

    公开(公告)号：US20210184595A1

    公开(公告)日：2021-06-17

    申请号：US17130779

    申请日：2020-12-22

    Applicant: Inertech IP LLC

    Inventor： Subrata K. Mondal

    IPC: H02M7/487 ,  H02J9/06 ,  H02M3/04

    Abstract: Control systems for a multi-level diode-clamped inverter and corresponding methods include a processor and a digital logic circuit forming a hybrid controller. The processor identifies sector and region locations based on a sampled reference voltage vector V* and angle Θe*. The processor then selects predefined switching sequences and pre-calculated turn-on time values based on the identified sector and region locations. The digital logic circuit generates PWM switching signals for driving power transistors of a multi-level diode-clamped inverter based on the turn-on time values and the selected switching sequences. The control system takes care of the existing capacitor voltage balancing issues of multi-level diode-clamped inverters while supplying both active and reactive power to an IT load. Using the control system, one can generate a symmetrical PWM signal that fully covers the linear under-modulation region.

    Systems and methods for mitigating harmonics in electrical systems by using active and passive filtering techniques
    14.
    发明授权
    Systems and methods for mitigating harmonics in electrical systems by using active and passive filtering techniques 有权

    公开(公告)号：US10931190B2

    公开(公告)日：2021-02-23

    申请号：US15333177

    申请日：2016-10-24

    Applicant: Inertech IP LLC

    Inventor： Subrata K. Mondal

    IPC: H02J9/06 ,  H02M1/12 ,  H02M3/158 ,  H02M7/537 ,  H02J3/18 ,  H02J3/32 ,  H02M7/487 ,  H02J3/01 ,  H02J3/28

    Abstract: Systems and methods of the present disclosure involve passive, hybrid, and active filtering configurations to mitigate current harmonics for various electrical loads. One hybrid filtering configuration is medium voltage (MV) active filtering using a DC-DC converter and a multi-level inverter, and low voltage (LV) passive filtering. Another hybrid filtering configuration is MV passive filtering and LV active filtering using a two-level inverter. An active filtering configuration includes both MV and LV active filtering. The present disclosure also features power distribution unit (PDU) transformers electrically coupled to respective power supplies on the LV side of an electrical system. Each PDU transformer includes primary coils in a delta configuration and secondary coils in a wye configuration. The secondary coils are in series with respective leakage inductance coils. The secondary coils and the leakage inductance coils are integrated together into a single unit or module.

    Energy efficient electrical systems and methods for modular data centers and modular data pods
    15.
    发明授权
    Energy efficient electrical systems and methods for modular data centers and modular data pods 有权

    公开(公告)号：US10693312B2

    公开(公告)日：2020-06-23

    申请号：US15883496

    申请日：2018-01-30

    Applicant: INERTECH IP LLC

    Inventor： Subrata K. Mondal

    IPC: H02J1/10 ,  H02J9/06 ,  H02J9/04 ,  G06F1/30

    Abstract: An efficient, modular, direct current (DC) uninterruptible power supply (UPS) for at least one server of a data center is disclosed. The single-conversion DC UPS includes an AC-DC converter, an energy storage device electrically coupled to the output of the AC-DC converter, and a single conversion server supply DC-DC converter electrically coupled to the AC-DC converter and the energy storage device, which may be a low-voltage lithium-ion battery or combined with an ultra capacitor. The DC UPS may be incorporated into a UPS system for a data center including a plurality of server rack assemblies and a plurality of cooling distribution units (CDUs). The UPS system includes an electric generator, an AC UPS electrically coupled between the electric generator and the plurality of CDUs, and a plurality of DC UPSs coupled between the electric generator and the plurality of server rack assemblies.

    SYSTEMS AND METHODS FOR CONTROLLING MULTI-LEVEL DIODE-CLAMPED INVERTERS USING SPACE VECTOR PULSE WIDTH MODULATION (SVPWM)
    16.
    发明申请
    SYSTEMS AND METHODS FOR CONTROLLING MULTI-LEVEL DIODE-CLAMPED INVERTERS USING SPACE VECTOR PULSE WIDTH MODULATION (SVPWM) 审中-公开

    公开(公告)号：US20200076322A1

    公开(公告)日：2020-03-05

    申请号：US16545974

    申请日：2019-08-20

    Applicant: Inertech IP LLC

    Inventor： Subrata K. Mondal

    IPC: H02M7/487 ,  H02M3/04 ,  H02J9/06

    Abstract: Control systems for a multi-level diode-clamped inverter and corresponding methods include a processor and a digital logic circuit forming a hybrid controller. The processor identifies sector and region locations based on a sampled reference voltage vector V* and angle θe*. The processor then selects predefined switching sequences and pre-calculated turn-on time values based on the identified sector and region locations. The digital logic circuit generates PWM switching signals for driving power transistors of a multi-level diode-clamped inverter based on the turn-on time values and the selected switching sequences. The control system takes care of the existing capacitor voltage balancing issues of multi-level diode-clamped inverters while supplying both active and reactive power to an IT load. Using the control system, one can generate a symmetrical PWM signal that fully covers the linear under-modulation region.

    Power sources and systems utilizing a common ultra-capacitor and battery hybrid energy storage system for both uninterruptible power supply and generator start-up functions
    17.
    发明授权
    Power sources and systems utilizing a common ultra-capacitor and battery hybrid energy storage system for both uninterruptible power supply and generator start-up functions 有权

    公开(公告)号：US10193380B2

    公开(公告)日：2019-01-29

    申请号：US14994850

    申请日：2016-01-13

    Applicant: Inertech IP LLC

    Inventor： Subrata K. Mondal ,  Jakob Carnemark

    IPC: H02J7/00 ,  H02J9/00 ,  H02J9/06

    Abstract: Modular dual power sources and corresponding systems include a common hybrid energy storage system, a high frequency DC-DC converter coupled between the common hybrid energy storage system, and an ultra-capacitor module for starting up a generator, and a two-level inverter coupled to the common hybrid energy storage system to provide power in case of an interruption in power supplied by a utility supply. The hybrid energy storage system includes an ultra-capacitor module and a battery module. A fast charger is coupled to the hybrid energy storage system to quickly charge the ultra-capacitor module and the battery module, which, in turn, charge the ultra-capacitor module for starting up a generator via a high frequency DC-DC converter. High frequency transformers are used to magnetically isolate electrical noise of the generator and UPS functions and operate independently. The modular dual power sources can be connected in parallel to provide large MW output power.

    SYSTEMS AND METHODS FOR CONTROLLING MULTI-LEVEL DIODE-CLAMPED INVERTERS USING SPACE VECTOR PULSE WIDTH MODULATION (SVPWM)
    18.
    发明申请
    SYSTEMS AND METHODS FOR CONTROLLING MULTI-LEVEL DIODE-CLAMPED INVERTERS USING SPACE VECTOR PULSE WIDTH MODULATION (SVPWM) 审中-公开

    公开(公告)号：US20180294741A1

    公开(公告)日：2018-10-11

    申请号：US15913387

    申请日：2018-03-06

    Applicant: Inertech IP LLC

    Inventor： Subrata K. Mondal

    IPC: H02M7/487 ,  H02M3/04 ,  H02J9/06 ,  H02M7/5387

    CPC classification number: H02M7/487 ,  H02J9/061 ,  H02M1/0845 ,  H02M3/04 ,  H02M7/49 ,  H02M7/53873 ,  H02M2007/53876

    Abstract: Control systems for a multi-level diode-clamped inverter and corresponding methods include a processor and a digital logic circuit forming a hybrid controller. The processor identifies sector and region locations based on a sampled reference voltage vector V* and angle θe*. The processor then selects predefined switching sequences and pre-calculated turn-on time values based on the identified sector and region locations. The digital logic circuit generates PWM switching signals for driving power transistors of a multi-level diode-clamped inverter based on the turn-on time values and the selected switching sequences. The control system takes care of the existing capacitor voltage balancing issues of multi-level diode-clamped inverters while supplying both active and reactive power to an IT load. Using the control system, one can generate a symmetrical PWM signal that fully covers the linear under-modulation region.

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