How can I judge whether or not the product is usable for the transitional surge current. If the current pulse duration is shorter than the described condition, is the larger surge current acceptable?
Published：2024-06-20
-
- 用户_5489 (0)
- In past days, surGE CURRENT capability of a discrete diode had been considered to follow the I2t-constant law, as is the case with current fusing phenomenon. However, for more accurate estimation, the I2√t-constant law is preferABLE. therefore, guaranteed values for higher current products like as diode modules are calculated by I2･t , and lower current products like as discrete diodes should be calculated by I2√t. Even in this case, the resistance does not increase without limit, and the value at 100 μs is considered as the upper limit value for energization of 100 μs or less. In the case of a few micro SECOnds of electricity energizing time and a large duty, a limit could be caused due to the root mean squared value. ●Calculating formula for allowable current: I2√t =（IFSM／√2）2× √10ms IFSM: SURGE forward current resistance value shown in specifications or catalogues ｔ: Current Pulse duration (100μs = 0.0001s at minimum) The allowable current "I" can be obtained by substituting each value into the above formula. However, it would be corrected due to waveforms and energizing frequency. Square waveform: I itself Triangular waveform: I×√3 Half sine wave: I×√2 1. One shot current pulse: Current forcing only once in the circuit during the lifetime The calculated value as above 2. A few current pulses in a day: Irregular and long-interval current pulses when the power turns on etc. Half of the calculated value as above 3. Energizing continuously: Continuous energization A quarter of calculated value as above
- Published：2024-06-20
Recommend
Integrated Circuits
Discrete Components
Connectors & Structural Components
Assembly UnitModules & Accessories
Power Supplies & Power Modules
Electronic Materials
Instrumentation & Test Kit
Electrical Tools & Materials
Mechatronics
Processing & Customization
