Lighting has entered the LED era in an all-round way, and has penetrated into all aspects of our lives. With the continuous decline of LED costs and the increasing emphasis on energy conservation and environmental protection by governments, the market prospects for LED lamps have become more and more extensive. High-brightness LED lamps have been widely used in home, commercial, industrial, automotive and other fields.
LED is a very fragile device, which is threatened by thermal, mechanical shock, and transient surge currents caused by lightning and electrostatic discharge (ESD). The drive power is also exposed to transient voltage and surge current. And the risk of other problems being destroyed. Since the single LED lamp bead has a low voltage and a small power, the application uses a series or series-parallel structure, and its power can be supplied from a few watts to hundreds of watts with a constant current.
However, such a series LED lamp has a disadvantage. If one of the LEDs connected in series has an open LED, the entire lamp is not lit. This applies to certain types of lamps (such as warning lights, mining lights, emergency lights, etc.). Very dangerous. In order to keep the LED lamp continuously lit when an LED is open, it is very effective to use the LED open circuit protector, which can ensure the safety of the lamp. In addition, most of the LED drivers are constant current sources. After the LED is opened, a high voltage will appear in the circuit, which may cause breakdown of the electrolytic capacitor, causing deflagration and causing safety hazards.
One of the existing solutions is to use existing protection devices on the market, such as MOV, TVS, etc.; the other is that the LED driver IC integrates OVP overvoltage protection, but this solution may generate false triggers, resulting in continuous flashing. . Therefore, many new ICs use an OVP-free protection scheme (such as BP2356X), which is the first solution.
In the existing OVP protection circuit, the use of Zener diode (including TVS), metal oxide varistor, controllable 矽 rectifier, explosion-proof electrolytic capacitor and other open circuit protectors is more common, but these open circuit protectors have excellent Disadvantages:
Zener diodes (including TVS): Usually their size is smaller than SCR, which has inherent defects that are difficult to solve, and may only be short-circuited after the power is exceeded. Before the short circuit, there is a state of clamping for a long time in a high voltage state. At this time, the device has to withstand the same power of the original LED, and the heat is severe, which may easily cause overheating failure of the surrounding LED, and there is still a safety hazard;
Metal Oxide Varistor (MOV): Ideal for relatively high-energy power line transients typically caused by lightning strikes and large inductive load switches. However, it is not fast enough for low-voltage transients that may cause a single LED to fail. Similar to Zener diodes, there is a process of continuous over-heating, and there are still safety hazards;
Controllable 矽 Rectifier (SCR): fast response, clamped at low voltage, good protection and recovery. The disadvantage is high cost and complicated circuitry, requiring a resistive divider network to set the trigger voltage. The SCR trigger voltage variation can be quite large at different temperatures. In addition, the reverse blocking voltage is too high, so the SCR cannot provide reverse polarity protection.
Explosion-proof electrolytic capacitor: When the protection is activated, the explosion-proof electrolysis heating safety valve is opened, the electrolyte vaporization is slowly ejected to release the pressure until it is exhausted, there is no sound in the vaporization ejection process, and the circuit is disconnected; however, the explosion-proof electrolytic capacitor uses the high voltage in the line to persist, the internal capacitance Chemicals can spill into the board and pose a safety hazard.
Since these open circuit protectors are not perfect, is there an open circuit protector with fast response, high sensitivity, good protection effect and low cost? The answer is yes. For LED applications, Changzhou Yinhe Century Microelectronics Co., Ltd. has launched GP05/10 series LED open circuit protection diodes. Galaxy Microelectronics is a leading company in the field of semiconductor discrete devices. The company's products cover a full range of semiconductor devices, including diodes, transistors, rectifier bridges, LED lamp beads, optocouplers, ASICs and more.
GP05/10 series LED open circuit protection diodes provide over-voltage protection better than IC integration, which can completely avoid stroboscopic caused by malfunction. In addition, the GP05/10 series of LED open-circuit protection diodes are available in a small SOD-123F package with a typical thickness of 0.98mm, making them ideal for space-constrained boards.
According to reports, GP05/10 series LED open circuit protection diodes can provide different voltage position selection between 5V~250V, which can meet the protection application from single to multi-string. It provides a low-power, low-voltage path when an LED has an open-circuit fault in one of the LED beads or strings. Effectively protect electrolytic capacitors to avoid potential safety hazards such as bursting and burning. And when the peripheral fault is removed and the power is turned back on, the device function is automatically restored.
GP05/10 series LED open circuit protection diode open circuit protection principle
According to Galaxy Microelectronics, it can also be connected in parallel with one or several of the LED strings to provide bypass. When the LED in parallel with it is open, the GP05/10 series LED open circuit protection diode can provide a low-voltage path, keeping the other LED lamp beads of the whole lamp working normally, keeping the whole lamp intact. Compared with the currently widely used Zener diodes, the conduction voltage is lower, the power consumption is smaller, and the efficiency is higher.
In addition, GP05/10 series LED open circuit protection diode adopts planar passivation technology, featuring fast overvoltage response, strong transient surge absorption capability, reduced conduction voltage, and high temperature leakage. It can complete overvoltage protection within 1ms. (As shown below).
The GP05/10 series LED open circuit protection diode has a simple structure and only two pins. It can clamp to a low voltage of about 1.3V during protection, which can achieve the same protection effect as the thyristor rectifier and has low cost.
In summary, compared to Zener diode (including TVS), metal oxide varistor, controllable 矽 rectifier, explosion-proof electrolytic capacitor and other open circuit protectors. GP05/10 series LED open circuit protection diodes have the following advantages:
1. Fast response and reliable protection. After protection, it is in a lower power consumption state and will not cause overheating. After the abnormal release, the power supply function can be completely restored and the maintenance cost can be reduced.
2. Avoid stroboscopic caused by malfunction of IC integrated protection function;
3. It can provide low power consumption bypass. When used for local protection, it can bypass the local abnormal LED lamp bead to keep the whole lamp intact.
4. Optional small SOD-123F package, typical thickness 0.98mm, ideal for space compact circuit boards;
5. Provide a wide range of voltage gear options to meet different application needs.
6. Multiple protection, in addition to open circuit fault protection, provides additional surge and ESD protection as well as reverse connection protection. The protection action does not have any negative impact on the power supply.
In view of the excellent performance and advantages of GP05/10 series LED open circuit protection diodes, the maintenance cost of LED lamps can be greatly reduced, the service life can be prolonged, and the brand value of products can be improved. The product can be used in all applications from ordinary low-power LED lights to industrial lighting, automotive, commercial lighting, road lighting LED lights, especially for applications with safety requirements and high reliability and low maintenance requirements.
"At present, customers are mainly used for the protection of the whole string of lamps, the relative voltage is relatively high (such as 95V, 115V, 210V, 240V, etc.), and many customers have verified and purchased in large quantities. Other voltage gears are being serialized. For example, 35V, 63V, etc. have been developed and available. The low-voltage products for single or several LED bypass protection are under development.†The person in charge of Galaxy Microelectronics revealed to Gaogong LED.
Future Bus connectors Description
Future Bus connectors, which use 2mm style have a mating distance of 10mm. Both Future bus and the upgrade Future bus+ are out-dated.No additional work has been done to upgrade the specification over the years. However we still produce products which meet the Physical and Electrical layers of IEE P896.
Antenk future bus connecto feature
designed in metric dirnension on 2 millimeters grid over 5 rows.
1 Standardized product through EIA (USA), IEC and CECC (international).
2 Selected by IEEE as the interconnection system for Futurebus + / SCI / VicBus.
3 Multi-sources product,use for telecommunication, network, server / workstation market.
4 High tempersture materials SMT compatible.
5 Modular design giving flexibility for system design.
6 Stackable end to end without loss of contact position.
7 High density (more than 2 times as compared to the standard inch based " Euroconnector DIN 41612" ).
8 Tuning Fork female contact concept for higher robustness and improved reliability
(low contact resistance and high normal force).
9 Low insertion force design.
10 Inverse connector system (signal and power).
11 Optimized solder and compliant press-fit terminations for backplane and circuit board connectors.
12 differents mating lengths on signal and 3 on power for standard connector system.
Future Bus connectors Application
Telecom backplane board
Antenk offers a complete line of 5+2 and 8+2 Hard Metric Connectors as well as a complete line of 4 and 5 row Future bus Connectors.
4 and 5 row Future bus Connectors
4 Rows Signal & Power
5 Rows Signal & Power
Female IDC Type 4&5 Rows
Power Connector & Cable
Shroud
Vertical, 5 Rows
Right Aangle, 5 Rows
Vertical, 4 Rows
Right Angle, 4 Rows
5+2 and 8+2 Hard Metric Connectors
2.0mm Future Bus Connector Male DIP
2.0mm Future Bus Connector Female DIP
2.0mm Future Bus Connector Male Press Fit
2.0mm Future Bus Connector Female Press Fit
2.0mm Future Bus Connector Power Type
2mm HM (hardmetric) Connector Introduction
System designed to meet the current and future needs of instrumentation applications giving excellent electrical and mechanical characteristics. It is a high performance, high density system with flexible configuration which offers upgradeability. The connector system is fully supported by Antenk spice models to guarantee choosing the right product to match the application.
ANTENK 2.0mm HARD METRIC CONNECTOR MODULES comply with international IEC 917and IEC 61076-4-101
standards. The connector systems in telecommunication and other industries require hight density connectors to support
larger amounts of data increasingly higher speeds antenk 2mm hardmetric modules offer the solution
Features and Benefits:
This high density connector modules can be stacked end to end without loss of space.
1,ANTENK developed the 2.0mm series under thorough consideration of impedance match, propagation delay,
cross talk, reflection. It is the ideal connector for digital high speed data application.
2,ANTENK offers differend types with inverted mating configuration. The male connector is a fixed module at the
backplane and the female commector is a free component of the plug-in module. The male connector has 5 signal row.
3 The outer shielding rows z and f of the male connector engage the shielding contacts of the famale connector. theshield
is also designed for gas tight, press-fit installation.
4 The connector system offers 15 contact length that utilize the proven press-fit assembly technique. Within the 15
contact length are 3 mating levels, achievable on both the plug-in and rear I / 0 side.
5 Coding system prevents mix-up and wrong mating between male and female connectors.
6 The 2.0mm hard metric connectors and DIN 41612 connectors can be used on the same PC board as both have the
same mating distance.
7 Staggered make-break pin populations for optional hot-swap capability.
8 Rear pin option for through-the-backplane I/O application.
9 High density PCI capability,shield for EMI/RFI protection.
2mm HM (hardmetric) Connector Features:
High density system with small real estate on backplane and daughtercard
Extensive range of signal, power, coaxial and fibre board-to-board and cable-to-board connections
Modular units give flexible configuration
Special versions for VME64 extensions and CompactPCI
Signal contact rating 1.5a fully energized
Universal power module rated at 7.8A/line, 23.4A fully energized
All lines impedance controlled to 50 (single ended) and 100Ω (differential) nominal
Safe design, complies with IEC950 in mated condition
Universal power module is safe in unmated condition
Several performance levels for board and cable connectors with unshielded and shielded versions
Mismatching keys block mating before any contact touch
Small press fit board hole allows maximum track width and minimum signal corruption
1.4 to 5.6mm (0.055 to 0.220 inch) Backplane thickness range
2mm HM (hardmetric) Connector Applications
Communications & Networking, Computers & Computer Peripherals, Sensing & Instrumentation
Metric Connectors,2.0Mm Hard Metric Connectors,Hard Metric Connectors,Hard Metric Female Connector,2.0mm Future Bus Connector Male DIP,2.0mm Future Bus Connector Female DIP
ShenZhen Antenk Electronics Co,Ltd , https://www.antenkelec.com