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Over-temperature protection method for IGBT in frequency converter

An over-temperature protection and frequency converter technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as junction temperature fluctuations, inability to achieve over-temperature protection well, and achieve improved real-time performance, simple calculation, and reduced calculation. The effect of complexity

Active Publication Date: 2016-06-08
GUANGZHOU HEDY INTELLIGENT EQUIP CO LTD
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Problems solved by technology

At present, most manufacturers only perform thermal protection on the average junction temperature of the IGBT, but in the actual process, the junction temperature of the IGBT fluctuates, and the fluctuation range depends on the transient loss and operating conditions, especially in low-frequency and high-current applications. In some cases, the IGBT's junction temperature will fluctuate more, so the average junction temperature cannot achieve over-temperature protection well

Method used

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  • Over-temperature protection method for IGBT in frequency converter
  • Over-temperature protection method for IGBT in frequency converter
  • Over-temperature protection method for IGBT in frequency converter

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Embodiment 1

[0034] see figure 1 , the present embodiment provides a method for IGBT over-temperature protection in a frequency converter, the method comprising steps:

[0035] 1. Calculate the maximum junction temperature of the IGBT.

[0036] 2. Dynamically monitor the IGBT junction temperature. Once the current IGBT junction temperature exceeds the IGBT maximum junction temperature, the over-temperature protection will be activated.

[0037] The calculation method of the maximum junction temperature of the IGBT is described in detail below.

[0038] IGBT maximum junction temperature T jmax The calculation formula is:

[0039] T jmax =T jav +0.5ΔT j (1),

[0040] where T jav is the average junction temperature of the IGBT, ΔT j is the junction temperature fluctuation of the IGBT. In the present embodiment, formula (2) is used to obtain T jav :

[0041] T jav =P av R th_jh +T h (2),

[0042] in,

[0043] P av : Average loss of IGBT

[0044] R th_jh : IGBT junction-to-...

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Abstract

The invention discloses an over-temperature protection method for an IGBT in a frequency converter. The method comprises the steps that the maximum junction temperature of the IGBT is calculated; the junction temperature of the IGBT is monitored dynamically, and once the current junction temperature of the IGBT exceeds the maximum junction temperature of the IGBT, over-temperature protection is started; the calculation formula of the maximum junction temperature of the IGBT is: Tjmax=Tjav+0.5 delta Tj, wherein Tjmax is the maximum junction temperature of the IGBT, Tjav is the average junction temperature of the IGBT, and delta Tj is junction temperature fluctuations of the IGBT; the calculation formula of delta Tj is shown in the description, wherein f is the output frequency of the frequency converter (please see the description), T0 is the frequency cycle of the frequency converter (please see the description), Pav is the average power consumption of the IGBT, Pmax is equal to pi Pav, Z(t) is transient thermal resistance (please see the description), tau is a thermal resistance time constant, n is the total number of time constant sets and will be given by an IGBT manufacturer, and r is a transient thermal resistance value corresponding to each time constant. The maximum junction temperature is utilized for over-temperature protection, and therefore the IGBT can be effectively prevented from being damaged by over high junction temperature.

Description

technical field [0001] The invention relates to the research field of frequency converter temperature protection, in particular to an IGBT over-temperature protection method in a frequency converter. Background technique [0002] IGBT has the characteristics of easy driving, large peak current capacity, self-shutoff, and high switching frequency (10-40kHz). It is the most rapidly developing new generation of power electronic devices. IGBT is widely used in frequency conversion power supply, speed control motor, uninterruptible power supply and inverter welding machine. [0003] The junction temperature of the IGBT is the most intuitive reflection of the working state of the IGBT. The junction temperature of the third-generation IGBT is 125°C. In normal operation, the junction temperature of the IGBT must not exceed this temperature, otherwise the IGBT will be damaged due to overheating of the junction temperature. At present, most manufacturers only perform thermal protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12
CPCH02H7/1216
Inventor 李俊
Owner GUANGZHOU HEDY INTELLIGENT EQUIP CO LTD
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