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A temperature protection circuit for magnetic levitation frequency converter and magnetic levitation frequency converter

A technology for temperature protection circuits and frequency converters, applied in emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc. The effect of damage to electronic components, improving safety and reliability, and preventing fire accidents

Active Publication Date: 2021-03-02
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For some magnetic levitation frequency converters currently on the market, because there is no effective control and protection design for the temperature inside, the electrical components inside the frequency converter are burnt out due to excessive temperature. However, the burned out electrical components are frequently replaced. In this way, a certain amount of maintenance cost is also increased in terms of after-sales maintenance, and some are even more serious, causing the internal electrical components of the frequency converter to catch fire, which in turn causes a fire accident, which also seriously endangers personal safety.

Method used

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  • A temperature protection circuit for magnetic levitation frequency converter and magnetic levitation frequency converter
  • A temperature protection circuit for magnetic levitation frequency converter and magnetic levitation frequency converter

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Embodiment 1

[0027] A temperature protection circuit for a magnetic levitation frequency converter in this embodiment, such as figure 1 As shown, it includes a temperature control module 10, a first switch S1, an undervoltage control module 20, and a second switch QF2. The temperature control module 10 is electrically connected to a power module 30, and the first switch S1 is set on the power module. 30 and the path of the secondary measurement module, the undervoltage control module 20 is electrically connected to the secondary measurement module, and the second switch QF2 is set in the path of the power module 30 and the rectification and inverter power module;

[0028]The temperature control module 10 controls the first switch S1 to be turned on or off based on whether the internal temperature of the frequency converter exceeds the temperature protection threshold, and the secondary measurement module is in the power-off or power-on state, and the undervoltage control module 20 controls...

Embodiment 2

[0041] This embodiment provides a magnetic levitation frequency converter, the magnetic levitation frequency converter uses the temperature protection circuit for the magnetic levitation frequency converter described in Embodiment 1, because the temperature control module 10 controls the first frequency converter based on whether the internal temperature of the frequency converter exceeds the temperature protection threshold A switch S1 performs an on or off operation. Due to the opening or closing of the first switch S1, the secondary measurement module is in a power-off or power-on state, and the undervoltage control module 20 controls the second measurement module based on the power-off or power-on state of the secondary measurement module. The second switch QF2 performs on or off operation. That is, when the temperature exceeds the threshold, disconnecting the secondary measurement module and the rectification and inverter power module can protect the electronic components ...

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Abstract

A temperature protection circuit for a magnetic levitation inverter and a magnetic levitation inverter relate to the technical field of the magnetic levitation inverter. The temperature protection circuit for the magnetic levitation inverter comprises a temperature control module, a first switch, an undervoltage control module, and a second switch , The temperature control module is electrically connected with the power supply module, the first switch is arranged in the passage of the power supply module and the secondary measurement module, the undervoltage control module is electrically connected with the secondary measurement module, and the second switch is arranged at the power supply module and the rectified inverter power in the path of the module. In the present invention, the temperature control module controls the first switch to be turned on or off, and the secondary measurement module is in a power-off or energized state due to the on or off of the first switch, and the under-voltage control module is based on the power-off of the secondary measurement module. or the power-on state to control the second switch to be turned on or off, so as to prevent damage to the electronic components in the inverter cabinet caused by excessive temperature.

Description

technical field [0001] The invention relates to the technical field of magnetic levitation frequency converters, in particular to a temperature protection circuit for a magnetic levitation frequency converter and a magnetic levitation frequency converter. Background technique [0002] The magnetic levitation frequency conversion centrifugal chiller is a central air conditioner with low noise, small starting current, energy saving and high efficiency on the market. The magnetic levitation frequency converter is used to drive and control the compressor, which is an important core component of the whole unit. It is the application of frequency conversion Technology and Electronics Technology is a power electronic control device that controls an AC motor by changing the frequency of the motor's operating power supply. The magnetic levitation frequency converter is mainly composed of rectification, filtering, inverter, secondary measurement module, braking unit, drive unit, detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H5/04H02H7/12
CPCH02H5/047H02H7/1216
Inventor 张良浩乔一伦梁健豪邓佳伟周维邦李义丽
Owner GREE ELECTRIC APPLIANCES INC