Brake resistor wiring detection device and two-quadrant frequency converter brake unit

By installing a brake resistor wiring detection device in the brake unit of the two-quadrant inverter, the wiring misconnection problem is solved, and wiring errors are found during the power-on self-test of the inverter, avoiding system failures and inverter damage, and ensuring stable system operation and equipment reliability.

CN222689830UActive Publication Date: 2025-03-28SHANGHAI SIGRINER STEP ELECTRIC
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Patent Information

Application Number
CN202323669678.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-29
Publication Date
2025-03-28
Estimated Expiration
2033-12-29

AI Technical Summary

Technical Problem

The brake resistor wiring of the two-quadrant inverter is prone to misconnection, resulting in system shutdown, alarm or more serious problems such as overvoltage damage to the inverter.

Method used

A brake resistor wiring detection device is designed, including a detection circuit, a protection circuit and a feedback circuit, which is installed between the brake resistor B terminal and the DC-terminal in the brake unit of the two-quadrant inverter, and is connected in parallel with the brake IGBT. The device uses the detection circuit to output current information to determine whether the wiring is correct, so as to find wiring errors when powering on the inverter.

Benefits of technology

It effectively avoids system failures and inverter damage caused by brake resistor wiring errors, ensuring stable system operation and continuous reliability of equipment.

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Abstract

The utility model relates to the technical field of frequency converters, in particular to a brake resistor wiring detection device and a two-quadrant frequency converter brake unit, which are arranged in the two-quadrant frequency converter brake unit, are connected in series between a B terminal and a DC-terminal of a brake resistor of the brake unit, and comprise a detection circuit, a protection circuit and a feedback circuit. The detection circuit is connected in series between the terminal B of the brake resistor and the protection circuit and is used for controlling the detection circuit to be in an off state when the voltage value of the terminal B of the brake resistor is higher than a first preset setting value; the protection circuit is connected in series between the detection circuit and the feedback circuit and is used for maintaining the feedback circuit in an off state when the detection circuit is in an off state; the feedback circuit is used for detecting first current information in the disconnected state and detecting second current information in the connected state, the first current information is used for indicating that the brake resistor is correctly connected, and the second current information is used for indicating that the brake resistor is wrongly connected.
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