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1.发明授权公开(公告)号：US11611286B2
公开(公告)日：2023-03-21
申请号：US16935474
申请日：2020-07-22
Applicant: Danfoss Power Electronics A/S
Inventor： Henrik Rosendal Andersen
Abstract: A method for determining rectifier-stage output current and/or grid-side currents (iu, iv, iw) of a frequency converter (1) having a passive rectifier (3), an inverter (4), a DC-link with a DC-link inductor (Ldc) and a DC-link capacitor (Cdc) between the rectification stage (3) and the inverter stage (4) is described. In a frequency converter the current information for the grid-side currents (iu, iv, iw) should be obtained without a current sensor at the grid-side (2). To this end the method comprises the step of calculating a current in the DC-link (5) by using at least a voltage value (Urec) and characteristics of the rectifier (3) in the DC-link (5) and/or grid side currents to form a corrected current using the calculated current and a measured current or currents or a fraction of a measured current or currents, or a fraction of a measured current or currents.
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公开(公告)号：US20220182005A1
公开(公告)日：2022-06-09
申请号：US17541512
申请日：2021-12-03
Applicant: Danfoss Power Electronics A/S
IPC: H02P29/024
Abstract: The present invention is directed at a pulse shift protection method for detecting a phase-to-phase short circuit in a drive for controlling electric motors, wherein the drive provides an output voltage to the electric motor, and wherein the instant, at which a short circuit detection function is executed, is chosen to minimize disturbance in the output voltage of the drive. The invention is also directed at a drive for controlling electric motors, said drive including a controlling portion for generating an output signal and an output portion connectable to an electric motor. The drive is provided for executing the above-mentioned pulse shift protection method.
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公开(公告)号：US11558001B2
公开(公告)日：2023-01-17
申请号：US17541512
申请日：2021-12-03
Applicant: Danfoss Power Electronics A/S
IPC: H02P29/024
Abstract: The present invention is directed at a pulse shift protection method for detecting a phase-to-phase short circuit in a drive for controlling electric motors, wherein the drive provides an output voltage to the electric motor, and wherein the instant, at which a short circuit detection function is executed, is chosen to minimize disturbance in the output voltage of the drive. The invention is also directed at a drive for controlling electric motors, said drive including a controlling portion for generating an output signal and an output portion connectable to an electric motor. The drive is provided for executing the above-mentioned pulse shift protection method.
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公开(公告)号：US20210296882A1
公开(公告)日：2021-09-23
申请号：US17206366
申请日：2021-03-19
Applicant: Danfoss Power Electronics A/S
Inventor： Per Knudsen , Ansgar Nielsen , Henrik Rosendal Andersen
Abstract: The present invention relates to a motor controller providing a dual-channel functional-safety (FS) safe-torque-off (STO) function when controlling a motor. The motor controller includes an inverter with low-side switches and high-side switches, a low-side gate drive connected to the low-side switches, a high-side gate drive connected to the high-side switches, a first functional-safety safe-torque-off circuit connected to the high-side gate drive and a second functional-safety safe-torque-off circuit connected to the low-side gate drive, and a non-rein-forced high-voltage isolation barrier.
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公开(公告)号：US20210028715A1
公开(公告)日：2021-01-28
申请号：US16935474
申请日：2020-07-22
Applicant: Danfoss Power Electronics A/S
Inventor： Henrik Rosendal Andersen
Abstract: A method for determining rectifier-stage output current and/or grid-side currents (iu, iv, iw) of a frequency converter (1) having a passive rectifier (3), an inverter (4), a DC-link with a DC-link inductor (Ldc) and a DC-link capacitor (Cdc) between the rectification stage (3) and the inverter stage (4) is described. In a frequency converter the current information for the grid-side currents (iu, iv, iw) should be obtained without a current sensor at the grid-side (2). To this end the method comprises the step of calculating a current in the DC-link (5) by using at least a voltage value (Urec) and characteristics of the rectifier (3) in the DC-link (5) and/or grid side currents to form a corrected current using the calculated current and a measured current or currents or a fraction of a measured current or currents, or a fraction of a measured current or currents.
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Patent Agency Ranking
公开(公告)号：US12015334B2
公开(公告)日：2024-06-18
申请号：US16695567
申请日：2019-11-26
Applicant: Danfoss Power Electronics A/S
Inventor： Ansgar Nielsen , Henrik Rosendal Andersen , Steen Hornsleth
CPC classification number: H02M1/32 , H02M5/4585 , H02M1/327
Abstract: A power electronic device includes an input which is connected to an over-current-protection device arrangement and a DC-link, wherein the DC-link includes a series connection of at least two DC-link capacitors. In such a power electronic device the risk of a fire hazard should be minimized. To this end fault detecting element(s) are provided detecting an imbalance between the DC-link capacitors or an overload of at least one of the DC-link capacitors, wherein the fault detecting element(s) control maximum current inducing element(s) connected to the DC-link.
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公开(公告)号：US11516947B2
公开(公告)日：2022-11-29
申请号：US17189898
申请日：2021-03-02
Applicant: Danfoss Power Electronics A/S
Inventor： Amol Ramesh Chopade , Marian Lungeanu , Henrik Rosendal Andersen
Abstract: The present invention refers to an air-cooled motor controller for controlling electric motors, comprising a heat-sink and a variable fan for cooling passive and active components of the motor controller by means of an air stream generated by the fan. The invention is directed towards a fan control means and a coupled fan control method for controlling the speed of the fan of the motor controller in response to the losses in both passive and active devices inside the motor controller.
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公开(公告)号：US20210282302A1
公开(公告)日：2021-09-09
申请号：US17189898
申请日：2021-03-02
Applicant: Danfoss Power Electronics A/S
Inventor： Amol Ramesh Chopade , Marian Lungeanu , Henrik Rosendal Andersen
Abstract: The present invention refers to an air-cooled motor controller for controlling electric motors, comprising a heat-sink and a variable fan for cooling passive and active components of the motor controller by means of an air stream generated by the fan. The invention is directed towards a fan control means and a coupled fan control method for controlling the speed of the fan of the motor controller in response to the losses in both passive and active devices inside the motor controller.
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公开(公告)号：US20200169163A1
公开(公告)日：2020-05-28
申请号：US16695567
申请日：2019-11-26
Applicant: Danfoss Power Electronics A/S
Inventor： Ansgar Nielsen , Henrik Rosendal Andersen , Steen Hornsleth
Abstract: A power electronic device (1) is described comprising an input which is connected to an over-current-protection device arrangement (3) and a DC-link (7, 8), wherein the DC-link (7, 8) comprises a series connection of at least two DC-link capacitors (Cdc). In such a power electronic device the risk of a fire hazard should be minimized. To this end fault detecting means (14) are provided detecting an imbalance between the DC-link capacitors (Cdc) or an overload of at least one of the DC-link capacitors (Cdc), wherein the fault detecting means (14) control maximum current inducing means connected to the DC-link.
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公开(公告)号：US11749982B2
公开(公告)日：2023-09-05
申请号：US17206366
申请日：2021-03-19
Applicant: Danfoss Power Electronics A/S
Inventor： Per Knudsen , Ansgar Nielsen , Henrik Rosendal Andersen
CPC classification number: H02H7/0844 , H02P23/14 , H02P27/085
Abstract: The present invention relates to a motor controller providing a dual-channel func-tional-safety (FS) safe-torque-off (STO) function when controlling a motor. The motor controller includes an inverter with low-side switches and high-side switches, a low-side gate drive connected to the low-side switches, a high-side gate drive connected to the high-side switches, a first functional-safety safe-torque-off circuit connected to the high-side gate drive and a second functional-safety safe-torque-off circuit connected to the low-side gate drive, and a non-reinforced high-voltage isolation barrier.
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