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Method and device for overheat protection of elevator frequency converter power device

A technology for overheating protection and power devices, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, circuit devices, etc. Stop, improve safety effect

Active Publication Date: 2016-11-23
HITACHI ELEVATOR CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The elevator frequency converter usually adopts method 1 for overheating protection, but this will cause the elevator to stop suddenly and even trap people
Method 2 is not suitable for the occasion of the elevator, because the load of the elevator is constant during operation, so it is impossible to reduce the output power of the inverter when the temperature T1

Method used

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  • Method and device for overheat protection of elevator frequency converter power device
  • Method and device for overheat protection of elevator frequency converter power device

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Embodiment Construction

[0014] Embodiments of the present invention are described in detail below:

[0015] Such as figure 1 As shown, an overheating protection device for an elevator frequency converter power device, which includes:

[0016] The temperature detection module 10 is used to detect the temperature T of the power device of the elevator frequency converter in real time;

[0017] The temperature discrimination module 20 is used to distinguish and compare the detected temperature T of the power device of the elevator frequency converter with the first preset temperature T1 of overheating protection, and to compare the detected temperature T of the power device of the elevator frequency converter with the The overheat recovery preset temperature T0 is used for discrimination and comparison, and is used for discrimination and comparison between the temperature T and the second preset temperature T2 for overheat protection; Whether the temperature T of the power device of the elevator is gre...

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Abstract

The invention discloses an overheat protection method and device for a power device of an elevator frequency converter. The method comprises the following steps: detecting temperature T of the power device of the elevator frequency converter; comparing the detected temperature T with a first overheat protection preset temperature T1; reducing the carrier frequency of the elevator frequency converter below a preset value, switching a modulation method of the elevator frequency converter from three-phase modulation to two-phase modulation and slowing the operation of an elevator and stopping the elevator at a nearest layer when the temperature T is greater than the first preset temperature T1. The device includes a temperature detecting module, a temperature judging module, a carrier frequency switching module and a modulation mode switching module. By applying the method and device provided by the utility model, sudden stop of the elevator caused by over heat of the frequency converter and passenger trapping can be avoided, so that operation safety of the elevator can be improved.

Description

technical field [0001] The invention relates to an overheat protection method and device for an elevator inverter power device. Background technique [0002] There are two main ways to protect the inverter from overheating: [0003] The first method is to set the overheat protection temperature threshold T1 under the condition that the power device of the frequency converter does not exceed the maximum allowable temperature. During the operation of the inverter, the temperature T of the power device is detected in real time. When the temperature T is greater than the overheat protection temperature threshold T1, the output of the inverter is stopped to avoid damage to the power device of the inverter. [0004] The second method is to set the overheat protection temperature thresholds T1 and T2 under the condition that the inverter power device does not exceed the maximum allowable temperature, and T2>T1. During the operation of the inverter, the temperature T of the pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/00H02H5/04
CPCB66B5/00H02H5/04
Inventor 郭威张文俊刘俊斌赖志鹏杜永聪
Owner HITACHI ELEVATOR CHINA
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