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Equivalent assessment method and prediction method of current-carrying life of pulse fuse in repetitive frequency operation
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A repetition frequency and fuse technology, which is applied in the field of efficiency assessment, can solve the problem of difficulty in testing the high-frequency resonance current-carrying life of pulse fuses in inverter power supplies, and achieve accurate and reliable results, accurate prediction, and simple operation.
Active Publication Date: 2021-12-24
NORTHWEST INST OF NUCLEAR TECH
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[0005] In order to solve the technical problem that it is difficult to test the high-frequency resonance current-carrying life of the pulse fuse in the inverter power supply in the prior art, the present invention provides an equivalent assessment method and prediction method for the current-carrying life of the pulse fuse with repeated frequency operation
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Embodiment 1
[0227]Using the existing 0-DC150A adjustable DC power supply in the laboratory, the equivalent pulsed DC current-carrying life of a DC1600V / 250A / 10kHz pulse fuse was assessed for the high-frequency resonance current-carrying life, including the following steps:
[0228] Step 1. Determine the equivalent pulsed DC loading method
[0229] The resonant frequency carried by the pulse fuse is f 0 =10kHz sinusoidal resonant current I(t)=141sin(20π×10 3 t), the static resistance of the fuse at room temperature is R f0 =6mΩ; from t=0 moment, the pulse fuse carries current T continuously 0 =Pause after 10ms, the pause time is ΔT=10ms, T 0 +ΔT as the time T for one job 1 ,T 1 =T 0 +ΔT=20ms; at t=T 1 At this moment, the pulse fuse starts carrying current for the second time, completely repeats the whole process of carrying current and suspending the first time, and the working time is still T 1 ;According to the above mode, the pulse fuse repeats work n times, n=3000, repetition f...
Embodiment 2
[0239] Using the existing 0-DC150A adjustable DC power supply in the laboratory, a DC1600V / 250A / 10kHz high-frequency resonant current-carrying pulse fuse was used for aging and prediction of equivalent pulsed DC current-carrying pulse, including the following steps:
[0240] Step 1. Determine the equivalent pulsed DC loading method
[0241] The resonant frequency carried by the pulse fuse is f 0 =10kHz sinusoidal resonant current I(t)=141sin(20π×10 3 t), the static resistance of the fuse at room temperature is R f0 =6mΩ; from t=0 moment, the pulse fuse carries current T continuously 0 =Pause after 10ms, the pause time is ΔT=10ms, T 0 +ΔT as the time T for one job 1 ,T 1 =T 0 +ΔT=20ms; at t=T 1 At this moment, the pulse fuse starts carrying current for the second time, completely repeats the whole process of carrying current and suspending the first time, and the working time is still T 1 ;According to the above mode, the pulse fuse repeats work n times, n=3000, repetit...
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Abstract
The invention provides an equivalent assessment method and prediction method for the current-carrying life of a pulse fuse with repeated frequency operation, which solves the problem that it is difficult to test the high-frequency resonance current-carrying life of a pulse fuse in an inverter power supply in the prior art. The assessment method includes the following steps: 1) Determine the equivalent pulsed DC loading method, specifically including the equivalent treatment of current-carrying heating DC and the equivalent treatment of intermittent heat dissipation; 2) Assemble the pulse fuse, and the surface temperature T fuse Meet the conditions: T in ‑1℃≤T fuse ≤ T in +1°C; 3) Pulse fuse current-carrying life assessment, specifically setting the output DC current amplitude of the power supply and the time parameters for each group of power supply assessment, until the pulse fuse life is exhausted and broken, and the pulse fuse group i is completed Equivalent pulse DC current-carrying assessment, the pulse fuse current-carrying life N life＝ i*n or t life =i*nT 0 .
Description
technical field [0001] The invention relates to a method for assessing and predicting the current-carrying life of a pulse fuse, in particular to an equivalent assessment method and a predicting method for the current-carrying life of a pulse fuse with repeated frequency operation. Background technique [0002] Fuse is a short circuit overcurrent protection device, which is widely used in power electronics, inverter power supply, new energy vehicle battery, ship power system, high-speed rail locomotive, aerospace and other fields. According to the different characteristics of current-carrying current, fuses can be divided into DC fuses, AC fuses, pulse fuses and other types. There are two core functions of the fuse, which are to realize the current-carrying function under the normal operation of the system, and to realize the rapid breaking protection function under the short-circuit and over-current situation of the system. The fuse carries current through the melt with a ...
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