The rapid development of flat panel LCD technology enables large screens, wide viewing angles, and high quality video images to be realized. However, as the screen of the LCD TV is larger and the brightness is higher, the voltage and current required for operation are gradually increased. Moreover, since a variety of interfaces for the user to use are arranged in the screen of the liquid crystal television, it is particularly susceptible to damage due to overcurrent and overvoltage.
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Circuit protection devices help protect the screen from damage due to excessive current. This protection can take the form of a fuse or a resettable polymer positive temperature coefficient (PPTC) device. The type of threat that LCD screen design and equipment can suffer depends on whether a PPTC device or a one-time fuse is used.
Due to the user's incorrect wiring and operational errors, the LCD screen may experience more serious overload and short circuit. Designers can prevent costly screen components from being damaged by isolating critical circuits. The resettable nature of PPTC devices is generally best suited for situations where the metal interface is likely to be an inlet for overcurrent conditions and overvoltage transients.
In the inverter power supply application mode shown in Figure 1, the PPTC device or fuse can be used before the inverter, which helps protect the user from the fatal high voltage short circuit of the device.
PPTC devices are also commonly used to protect circuits that are subject to large inrush currents during startup. PPTC devices are much more adaptable to inrush currents than fuses, helping to eliminate the maintenance effort caused by fuses being repeatedly subjected to inrush currents due to fuses.
Figure 1 PPTC device helps protect liquid crystal components and improves system safety and reliability
The fuses are well suited for use in circuits where the device does not have a resettable feature, or for faults that only occur under system fault conditions. After using a soft-start circuit to limit the inrush current, the use of fuses is also a more practical solution. Raychem Circuit Protection offers both a small PPTC device and a single-use chip fuse, providing designers with a complete circuit protection solution.
Ruisui Circuit Protection's miniSMD and nanoSMD series of PolySwitch ǹ 次 骷î’æ“ éª·î’æ“ éª·î’æ“ ç³œè¯®î²ç¼ 糜诮î²ç¼ 糜诮î²ç¼ 糜诮î²ç¼ 糜诮î²ç¼ 蹇 蹇 蹇 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌 庖幌艿 æ“ž æ“ž æ“ž 缌鞯 缌鞯 跋欤 跋欤 ┦褂 ┦褂 Т Т Т Т Т Т Т Т Т? These devices also provide fast operating times and very low on-board resistance values.
Raychem Circuit Protection's fast-acting electronic chip fuses are available in industry-standard 0402, 0603, and 1206 chip sizes. The surface mount fuse series offers a low profile, high reliability, strong arc suppression and the highest current rating possible with 0402 and 0603 form factor.
The fuses complying with the RoHS Hazardous Substances Safety Directive use a monolithic integrated circuit and multi-layer design to provide the highest holding current at the minimum board area, reducing the aging process associated with heat dissipation and improving the product. Reliability and adaptability, and higher temperature performance in a wide range of circuit protection designs.
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