High Power Semiconductor Crowbar Protector for AC Power Line Applications Application Note
■AC power line disturbances are the cause of many equipment failures. The damage can be as elusive as occasional data loss or as dramatic as the destruction of a power supply, LED Lighting, Industrial system and consumer equipment such as ovens or refrigerators and television sets.
■Power line disturbances go by many names---transients, surges, spikes, glitches, etc. But regardless of the specific name, an understanding of their characteristics and the operation of the various protection components available is necessary to design an effective protection circuit.
■There are some popular protection components for these power input lines. The most common over voltage protection components are MOVs (Metal Oxide Varistor), high power TVS (Transient Voltage Suppression) Diodes and GDTs (Gas Discharge Tube). In this article, we are going to discuss a new and innovative method of using a silicon crowbar component known as, the SIDACtor® Protection Thyristor, for the main over voltage protection solution for AC power lines.
●Surge Protection
■Surge protection components can be divided into two basic types: Crowbar type devices such as GDTs and protection thyristor type SIDACtor® components and clamp type components such as TVS diodes, MOVs etc.
■The clamp type components have faster response time but are limited in their current handling ability because the transient energy must be dissipated by the clamping component. Also, the voltage drop across a clamp type component increases as a function of the conducted current passing through it. Thus a higher clamping voltage threshold component will have a lower peak current capability. (The power rating remains the same for all components in a particular series but since power is the product of the voltage and current, an increasing voltage demands a decrease of current).
■A crowbar type component can handle much higher surge current because during their on-state condition, the voltage across the component is extremely low. These crowbarring components act as a “near short circuit value” path shunting the transient energy away from the protected equipment. And this, low on-state voltage will further reduce any electrical over stress to the protected circuit.
●SIDACtor® Component in AC Power Line Protection
■Questions may arise due to the nature of the SIDACtor® component being a crowbar protection and its compatibility with an AC power source. This article will review the design parameters for selecting a SIDACtor® component for AC power line protection. Please note that this discussion of the SIDACtor® component use is confined to AC power line only; it is not compatible for high current DC supply ports. The SIDACtor® component will reset on an AC port at the zero-crossing every half-cycle for an AC signal. However, for high current DC power lines, the SIDACtor® component will not reset if the short circuit current available is higher than its holding current parameter. Of course if you connect the SIDACtor® component with TVS or MOV in series, it can be used on DC power line too. TVS or MOV Vbr should be equal or higher than DC max voltage
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Pxxx0FNL Series 、 Pxxx0ME Series 、 Pxxx0S3N Series 、 Pxxx0FNL 、 Pxxx0ME 、 Pxxx0S3N 、 P1500MEL 、 P1900MEL 、 P2300MEL 、 P3800MEL 、 P4800MEL 、 P0640FNL 、 P0720FNL 、 P0900FNL 、 P1100FNL 、 P1300FNL 、 P1500FNL 、 P1900FNL 、 P2300FNL 、 P2600FNL 、 P3100FNL 、 P3500FNL 、 P3800FNL 、 P0080S3NLRP 、 P0300S3NLRP 、 P0640S3NLRP 、 P0720S3NLRP 、 P0900S3NLRP 、 P1100S3NLRP 、 P1300S3NLRP 、 P1500S3NLRP 、 P1900S3NLRP 、 P2300S3NLRP 、 P2600S3NLRP 、 P3100S3NLRP 、 P3500S3NLRP 、 P3800S3NLRP 、 V20E130P |
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High Power Semiconductor Crowbar Protector 、 Protection Thyristor |
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Application note & Design Guide |
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Please see the document for details |
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TO-218;TO-262M;DO-214AB |
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English Chinese Chinese and English Japanese |
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2022/5/27 |
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1.4 MB |
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