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A bridge arm junction temperature detection device, method and air conditioner

A detection device and bridge arm technology, applied in the direction of measuring devices, electrical devices, thermometers, etc., can solve problems such as device burnout and failure, and achieve the effects of eliminating potential safety hazards, improving device life, and saving after-sales costs

Active Publication Date: 2022-04-26
GREE ELECTRIC APPLIANCES INC
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  • Claims
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Problems solved by technology

However, judging from the current after-sales feedback, there are cases where the FET (field effect transistor) power device integrated in the three-phase inverter bridge arm of the IPM (or discrete three-phase bridge inverter circuit) is overheated every year, causing the device to burn out and fail. It is increasing year by year, and the air conditioner will face greater pressure after it realizes all frequency conversion

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  • A bridge arm junction temperature detection device, method and air conditioner
  • A bridge arm junction temperature detection device, method and air conditioner

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Embodiment Construction

[0025] As used herein, the words "first", "second", etc. may be used to describe elements in the exemplary embodiments of the present invention. These words are only used to distinguish one element from another element, and the inherent characteristics or order, etc. of the corresponding elements are not limited by the words. Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Those terms as defined in commonly used dictionaries are interpreted as having the same meaning as the contextual meaning in the relevant technical field, and are not interpreted as having ideal or overly formal meanings unless clearly defined as having such in the present invention meaning.

[0026] Those skilled in the art will appreciate that the devices and methods of the present invention described herein and illustrated in the accompanying drawings...

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Abstract

A bridge arm junction temperature detection device is provided, each bridge arm includes an upper bridge arm and a lower bridge arm, the drain of the lower bridge arm is connected to the source of the upper bridge arm, and the device includes: an NTC resistor, a high voltage diode, a branch Piezoresistor and control module, wherein the drain of the lower bridge arm is connected to one end of the NTC resistor, the other end of the NTC resistor is connected to the cathode of the high voltage diode, and the anode of the high voltage diode is connected to the voltage dividing resistor The first end of the voltage dividing resistor is connected to the source voltage; wherein the device also includes a control module, the voltage sampling positive end of the control module is connected to the anode of the high voltage diode and the first end of the voltage dividing resistor Between, used to detect the junction temperature of the bridge arm. The scheme of the present invention can realize the real-time detection of the junction temperature of all devices in the IPM or three-phase bridge arm circuit, and intelligently adjust the power of the whole machine when the junction temperature is too high, so as to avoid damage to the devices.

Description

technical field [0001] The invention relates to the field of intelligent control, and more particularly relates to a bridge arm junction temperature detection device, method and air conditioner. Background technique [0002] IPM (Intelligent Power Module) is an advanced power switching device that combines the advantages of GTR (High Power Transistor) high current, low saturation voltage and high withstand voltage, and MOSFET (Metal-Oxide Semiconductor Field Effect Transistor) high input Impedance, high switching frequency and low drive power advantages. The logic, control, detection and protection circuits are integrated inside the IPM, which is easy to use, not only reduces the size of the system, shortens the development time, but also enhances the reliability of the system, adapting to the development direction of today's power devices, IPM in power The field of electronics has been more and more widely used. [0003] With the upgrading of national energy efficiency, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/22
CPCG01K7/22
Inventor 周伟苏兆华刘超万如姜学想张杰添
Owner GREE ELECTRIC APPLIANCES INC
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