Lock Interface Module
Lock Interface Module
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LCD backlight, I / O ports and power protection circuit design
With the LCD TV screen becomes larger and more light, they require more voltage and more current, more stable and more reliable on the circuit protection technologies demand more urgent.
There are a variety of circuit protection devices can be used to help protect LCDled / 'target =' _blank '> display against high current or high voltage transients caused damage. Over-current protection can be taken to fuse or reset the PPTC (polymeric positive temperature coefficient) devices. Choose which programs, depending on the LCD design, the product may be exposed to the risk category, and even the relevant safety requirements.
PPTC device is generally applicable to the startup circuit withstand the large inrush current. PPTC device can withstand the impact of surge current and eliminates the trouble of replacing burned fuse. Fuse is not required for self-recovery circuit design, or only error in the system caused by circumstances that the impact of over-current circuit. When the soft start circuit is used to limit inrush current, the fuse is a practical solution.
To improve security and reliability of equipment can be a variety of over-voltage and over current protection devices, such as coordination, as discussed in this article use this overvoltage protection device includes: metal oxide varistors (MOV), multi-layer varistors (MLV) and electrostatic discharge (ESD) surge protection devices.
Protection LED backlight
LED backlighting enhances the visual experience, to provide more flexible backlight architectures, and to achieve than the traditional cold cathode fluorescent lamp (CCFL) display technology, thin design more clear. Other benefits of LED backlighting include: higher efficiency, lower power consumption, longer life, better durability and higher resolution for more contrast.
LED need accurate power and thermal management system, this is because most of the energy provided to the LED is converted to heat rather than light. If no suitable thermal management measures, these LED life and heat will have a negative impact on the color output.
Coming from the power line coupling transient voltage and surge voltage can also reduce LED life, many LED driver is easy due to incorrect polarity of the DC voltage level and the damage to the LED driver output may be due to short circuit damage. Most applications for LCD TV LED driver contains an embedded security features, such as thermal shutdown and open and short LED detection. However, the possible need for additional over-current protection devices to help protect the IC and other sensitive electronic components.
PPTC device can also be used to prevent thermal runaway, if the LCD monitor of the cooling channel is blocked, thermal runaway can occur. PPTC device has over-temperature incident detection and response capacity, so If it is installed in place, it can heat in the absence of appropriate measures to cut off the current when the LED work.
Figure 1 shows how the PolySwitch PPTC device in series with the LED to provide overcurrent protection. To take full advantage of PolySwitch devices, which can be bound to the metal core thermal circuit board or LED radiator. If the LED is no built-in ESD protection circuit can be PESD protection device in parallel with the LED, which helps protect the LED from ESD damage caused by surge voltage.
I / O port overcurrent and overvoltage protection
I / O port protection circuit to help protect components from damage, improve reliability and protect customer safety. To meet the requirements of regulatory agencies, I / O port must provide a short circuit in the case of overload or shutdown or restrict current methods.
As data rate increases, circuits become smaller and more sensitive to protect equipment from damage caused by transient voltage circuit becomes more important. HDMI, USB and DisplayPort specifications: the end user can touch the electrical connector must have overcurrent protection. Overcurrent protective device must be no user manual intervention can be automatically restored, and its pre-set the trigger threshold must be higher than the permissible transient current protection to prevent accidental movement.
Applications in a variety of high-speed interface, PPTC devices have proven their effectiveness. Like traditional fuses, they can also be specified thresholds have been exceeded limit the current. However, the difference is with the fuses, PPTC devices have the fault is cleared and re-self-recovery after power capacity. PPTC device's low-impedance, fast response time and small form factor and other characteristics have been made in many bus-powered over-current protection-based applications become the preferred method.
Ports are vulnerable, including electric pulses, including over-voltage ESD transient damage. Figure 2 shows an overcurrent protection device using a typical PolySwitch circuit protection design, in which devices and varistors used PESD help protect ports from overvoltage damage.
MLV parallel devices provide low capacitance protection, LCD TV applications, the required high current handling and energy absorption of over-voltage protection function. PESD array installed in the data line, to help the ESD sensitive to static electricity from the circuit split out. PESD low capacitance devices to help prevent the degradation of high data rate signals.
Protection of multi-output power
Switch mode power supply (SMPS) provides consumer electronics products for the size, weight and energy saving advantages, and to continue to include the LCD TV display in a number of applications, including replacing linear regulators. However, due to the lack of pre-SMPS design of the inherent impedance, they often need to be more reliable circuit protection.
PPTC overcurrent protection device can help manufacturers meet for the SMPS of UL60950-1/LPS (limited supply) requirements and help to improve equipment safety and reliability.
Under normal operating current, PPTC devices have very low resistance value. In an overcurrent condition, PPTC device "jump" into the high impedance state. By the increase in resistance may be at fault conditions the current flow is reduced to a low steady-state level to help protect the circuit device. Before the fault is cleared, PPTC device will always be locked in a high impedance state. Once re-powered, PPTC device will reset itself and allow current flow through the circuit to resume normal operation.
Although the PPTC device can not prevent failure, but they can respond quickly to limit the current to a safe level, thus helping to prevent damage to the downstream device failure. Furthermore, PPTC devices in small form factor makes them easy to use space-constrained applications.
lcm driver, uart lcm
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tft driver ic, lcd display terminal
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