Application Note: Inductive Load Arc Suppression
When a reed switch or reed sensor is used to control an inductive device (relay coil, solenoid, transformer, small motor, etc.), the energy stored in the inductance in the device will subject the switch contacts to a high voltage when the reed switch opens. When the switch contacts open, the contact gap is initially small. Arcing across this contact gap can occur immediately after the switch opens. This can happen in resistive as well as inductive loads, but inductive loads generate a higher voltage and this causes increased arcing. Increased arcing decreases switch life. Direct current (DC) inductive circuits typically use a diode to prevent the high voltage. The diode in the circuit is called a suppression diode, flyback diode, freewheeling diode, or catch diode. However, a diode cannot be used in an alternating current (AC) circuit. AC arc suppression requires the use of a metal-oxide varistor (MOV), a bidirectional transient voltage suppressor (TVS) diode, or an RC suppression network. An RC suppression network is also called a snubber. The various arc suppression methods have various advantages and disadvantages. Using no suppression is also an option if life is adequate without it. Which method to use is determined by trade-offs between cost, contact life, packaging, etc.
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reed sensor 、 reed switch 、 suppression diode 、 metal-oxide varistor (MOV) 、 bidirectional transient voltage suppressor (TVS) diode |
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[ relay coil ][ solenoid ][ transformer ][ small motor ][ DC ][ AC ] |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2016/11/24 |
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287 KB |
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