US-20260128705-A1 - Protection Apparatus And Protection Method For Driver, And Driver

US20260128705A1US 20260128705 A1US20260128705 A1US 20260128705A1US-20260128705-A1

Abstract

The present disclosure provides protection apparatus and methods for a driver. An example protection apparatus includes a meter, a loop unit, and a controller. The detection unit is configured to detect a current flowing through an inverter unit. The loop unit is configured to connect a positive terminal to a negative terminal of a DC bus or disconnect the positive terminal from the negative terminal of o the DC bus. The control unit is configured to, in response to power on of the driver, control the loop unit to connect the DC bus, and determine, based on a detection result of the detection unit, whether a three-phase AC power is connected to the three-phase motor wiring terminal, wherein in the case that a three-phase AC power is connected to the three-phase motor wiring terminal, the control unit stops.

Inventors

Kai Jiang
Yu Xu

Assignees

SIEMENS AKTIENGESELLSCHAFT

Dates

Publication Date: 20260507
Application Date: 20220930

Claims (10)

1 . A protection apparatus for a driver, the driver comprising a three-phase AC power wiring terminal, a rectifier unit, a DC bus, an inverter unit, and a three-phase motor wiring terminal that are successively connected, the protection apparatus comprising: a meter to detect a current flowing through the inverter unit; a loop arranged between a positive terminal and a negative terminal of the DC bus and operable to connect and disconnect the positive terminal to the negative terminal of the DC bus under control of a drive signal; and a controller to generate the drive signal in response to power on of the driver, driving the loop unit to connect the positive terminal to the negative terminal of the DC bus, and to determine, based on a detection result of the meter, whether a three-phase AC power is connected to the three-phase motor wiring terminal; wherein in a case that a three-phase AC power is connected to the three-phase motor wiring terminal, the controller stops the inverter unit from being started in response to receiving a start command, and in a case that no three-phase AC power is connected to the three-phase motor wiring terminal, the controller generate the drive signal to drive the loop unit to disconnect the positive terminal from the negative terminal of the DC bus, and drives, in response to receiving the start command, the inverter unit to operate.
2 . The protection apparatus according to claim 1 , wherein: the control unit is preassigned with a current threshold greater than or equal to 0 A and is configured to compare the current detected by the meter with the current threshold; in a case that the current detected by the meter is greater than the current threshold, assess a three-phase AC power is connected to the three-phase motor wiring terminal, and in a case that the current detected by the meter is less than or equal to the current threshold, no three-phase AC power is connected to the three-phase motor wiring terminal.
3 . The protection apparatus according to claim 1 , further comprising an alarm module to generate an alarm under control of an alarm signal; wherein the controller controls the alarm module to generate the alarm by generating the alarm signal in response to determining that a three-phase AC power is connected to the three-phase motor wiring terminal.
4 . The protection apparatus according to claim 1 , wherein: the meter comprises: a sampling resistor module arranged between the DC bus and the inverter unit; and sampling resistor module is connected to the controller.
5 . The protection apparatus according to claim 4 , wherein: the meter further comprises an analog-to-digital converter module connected to the sampling resistor module and the controller; the analog-to-digital converter module is configured to perform analog-to-digital conversion on the current detected by the sampling resistor module and send the analog-to-digital converted current to the controller.
6 . The protection apparatus according to claim 1 , wherein: the loop unit comprises: an insulated gate bipolar transistor and a consuming resistor connected in series between the positive terminal and the negative terminal of the DC bus; and the drive signal comprises a PWM signal output by the controller to a gate electrode of the insulated gate bipolar transistor.
7 . The protection apparatus according to claim 1 , wherein: the driver further comprises a brake unit; and the loop unit comprises the brake unit of the driver.
8 . A driver comprising: three three-phase AC power wiring terminals connected to a three-phase AC power; a rectifier unit connected to the three three-phase AC power wiring terminals and configured to convert a three-phase AC power to a DC power; a DC bus connected to the rectifier unit and configured to receive a DC power; an inverter unit, connected to the DC bus and configured to convert a DC power to a three-phase AC power for controlling a motor; three three-phase motor wiring terminals, connected to a three-phase motor; and a protection apparatus including: a meter to detect a current flowing through the inverter unit; a loop unit arranged between a positive terminal and a negative terminal of the DC bus and operable to connect and disconnect the positive terminal to the negative terminal of the DC bus under control of a drive signal; and a controller to generate the drive signal in response to power on of the driver, driving the loop unit to connect the positive terminal to the negative terminal of the DC bus, and to determine, based on a detection result of the meter, whether a three-phase AC power is connected to the three-phase motor wiring terminal; wherein the meter is configured to detect a current flowing through the inverter unit, the loop unit is arranged between a positive terminal and a negative terminal of the DC bus and is configured to connect the positive terminal to the negative terminal of the DC bus or disconnect the positive terminal from the negative terminal of the DC bus under control of a drive signal, and the controller, is configured to, in response to power on of the driver, control, based on the drive signal, the loop unit to connect the positive terminal to the negative terminal of the DC bus, and determine, based on a detection result of the meter, whether a three-phase AC power is connected to the three-phase motor wiring terminal, wherein in a case that a three-phase AC power is connected to the three-phase motor wiring terminal ( 55 ), the controller stops, in response to receiving a start command, the inverter unit from being started, and in a case that no three-phase AC power is connected to the three-phase motor wiring terminal, the controller controls, based on the drive signal, the loop unit to disconnect the positive terminal from the negative terminal of the DC bus, and drives, in response to receiving the start command, the inverter unit to operate.
9 . A protection method for a driver, the driver comprising a three-phase AC power wiring terminal, a rectifier unit, a DC bus, an inverter unit, and a three-phase motor wiring terminal that are successively connected, the protection method comprising: connecting a positive terminal to a negative terminal of the DC bus in response to power on of the driver; detecting a current flowing through the inverter unit, and determining the current as a detected current; determining whether a three-phase AC power is connected to the three-phase motor wiring terminal based on the detected current; stopping the inverter unit from being started, in a case that a three-phase AC power is connected to the three-phase motor wiring terminal in response to receiving a start command; and disconnecting the positive terminal from the negative terminal of the DC bus and driving the inverter unit to operate in response to receiving the start command, and in a case that no three-phase AC power is connected to the three-phase motor wiring terminal.
10 . The protection method according to claim 9 , wherein: determining, whether a three-phase AC power is connected to the three-phase motor wiring terminal based on the detected current includes comparing, the detected current to a current threshold greater than or equal to 0 A in a case that the detected current is greater than the current threshold, determining that a three-phase AC power is connected to the three-phase motor wiring terminal, and in a case that the detected current is less than or equal to the current threshold, determining that no three-phase AC power is connected to the three-phase motor wiring terminal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a U.S. National Stage Application of International Application No. PCT/CN2022/123526 filed Sep. 30, 2022, which designates the United States of America, the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD The present disclosure relates to a protection apparatus. Various embodiments of the teachings herein include protection systems and/or methods for a driver, and/or drivers having a protection apparatus. BACKGROUND A driver acts as a controller to control a motor. A three-phase AC power is typically input to the driver and the driver achieves a three-phase output upon rectification and inversion. The driver is provided with three-phase AC power wiring terminals (L1, L2, and L3) and three-phase motor wiring terminals (U, V, and W). In use, the three-phase AC power is prone to being connected by mistake to the three-phase motor wiring terminals, thereby causing damage to the driver. SUMMARY Teachings of the present disclosure include protection apparatus for a driver, such that the driver is protected in the case that a three-phase AC power is connected by mistake to a three-phase motor wiring terminal. For example, some embodiments include a protection apparatus for a driver, the driver comprising a three-phase AC power wiring terminal, a rectifier unit, a DC bus, an inverter unit, and a three-phase motor wiring terminal that are successively connected, wherein the protection apparatus for the driver comprises: a detection unit (10), configured to detect a current flowing through the inverter unit; a loop unit (20), arranged between a positive terminal and a negative terminal of the DC bus and configured to connect the positive terminal to the negative terminal of the DC bus or disconnect the positive terminal from the negative terminal of the DC bus under control of a drive signal; and a control unit (30), configured to, in response to power on of the driver, control, by generating the drive signal, the loop unit (20) to connect the positive terminal to the negative terminal of the DC bus, and determine, based on a detection result of the detection unit (10), whether a three-phase AC power is connected to the three-phase motor wiring terminal, wherein in a case that a three-phase AC power is connected to the three-phase motor wiring terminal, the control unit (30) stops, in response to receiving a start command, the inverter unit from being started, and in a case that no three-phase AC power is connected to the three-phase motor wiring terminal, the control unit (30) controls, by generating the drive signal, the loop unit (20) to disconnect the positive terminal from the negative terminal of the DC bus, and drives, in response to receiving the start command, the inverter unit to operate. In some embodiments, the control unit (30) is preassigned with a current threshold greater than or equal to 0 A and is configured to compare the current detected by the detection unit (10) with the current threshold, wherein in a case that the current detected by the detection unit (10) is greater than the current threshold, it is determined that a three-phase AC power is connected to the three-phase motor wiring terminal, and in a case that the current detected by the detection unit (10) is less than or equal to the current threshold, it is determined that no three-phase AC power is connected to the three-phase motor wiring terminal. In some embodiments, the protection apparatus further comprises an alarm module (40), configured to generate an alarm under control of an alarm signal, wherein the control unit (30) is further configured to control, in response to determining that a three-phase AC power is connected to the three-phase motor wiring terminal, the alarm module (40) to generate the alarm by generating the alarm signal. In some embodiments, the detection unit (10) comprises: a sampling resistor module (12), arranged between the DC bus and the inverter unit, wherein the sampling resistor module (12) is connected to the control unit (30). In some embodiments, the detection unit (10) further comprises: an analog-to-digital converter module (14), connected to the sampling resistor module (12) and the control unit (30), wherein the analog-to-digital converter module (14) is configured to perform analog-to-digital conversion on the current detected by the sampling resistor module (12) and send the analog-to-digital converted current to the control unit (30). In some embodiments, the loop unit (20) comprises: an insulated gate bipolar transistor (22) and a consuming resistor (24), wherein the insulated gate bipolar transistor (22) and the consuming resistor (24) are connected in series between the positive terminal and the negative terminal of the DC bus, and the drive signal is a PWM signal output by the control unit (30) to a gate electrode of the insulated gate bipolar transistor (22). In some embodiments, the driver