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30-03-2020 | | by Nnamdi Anyadike
There are various types of fuses currently on the market, although they can be roughly divided into two categories: slow-acting fuses and fast-acting fuses. One of their main functions is as a circuit protection component, protecting the circuit from overcurrent and overvoltage (static electricity) in the secondary circuit of electronic equipment. The demand for fail-safe slow-blow fuses (defined as fuses that can withstand high voltages in a short period of time without short-circuiting) is growing, especially in the automotive industry. These fuses can withstand the high currents that normally pass through electronic circuits when the car engine is started. In contrast, fast fuses are the fuse of choice for household appliances, and they are very sensitive to changes in current. Fast-acting fuses allow household appliances to survive by immediately short-circuiting themselves rather than electronic circuits.
SCHURTER AG, an innovator and manufacturer of German electrical and electronic components, has introduced an anti-pulse SMD ceramic fuse, which is described as having "ultra-slow" release characteristics. It is designed to be used as a fail-safe device in particularly demanding applications. The compact UMT-W SMD fuse provides five rated currents from 5 A to 20 A. It has a rated voltage of up to 125 V (AC and DC) and a breaking capacity of up to 1000 A. Recommended applications include where high "inrush" current flows. It is particularly suitable for applications with extremely long cable lengths, such as avionics, which are mainly protected by electronics. The company explained: "If this [electronic protection] monitoring fails or the task cannot be performed correctly, UMT-W will take over as a fail-safe device and transfer the system to a safe power-off state." UMT-W fuses have "precision "The fusing time of ", which ensures that the safety channel is four times the overcurrent protection that can be implemented in combination with electronic protection.
1000A ceramic fuse anti-pulse
In March, German semiconductor manufacturer Infineon Technologies AG, a spin-off from Siemens AG, announced the introduction of OptiMOS IPOL's IR3887M, IR3888M and IR3889M devices into its new series of integrated point-of-load regulators. These regulators have a fast constant on-time (COT) engine and are designed for servers, base stations, and telecom and storage applications. Ceramic capacitors do not require external compensation. Supports a wide input voltage range of 4.3 V – 17 V, 2 V minimum, 5 V external bias, and accurate output voltage (0.5% accurate reference voltage). The company said: "The voltage regulator provides high efficiency and thermally compensated internal overcurrent protection at light loads, with four optional limits for cheaper and smaller inductors." The switching frequency is up to 2MHz. "These products provide benchmark efficiency, low power loss, and the ability to heat treat up to 30 A continuous current," it continued. Customers can also benefit from reference output voltage regulation and enhanced load transient response.
With the launch of Toshiba TCKE8xx series, Japanese conglomerate Toshiba Electric recently entered the electronic fuse market. The six device series have high-precision over-current limit, over-voltage protection, over-temperature protection, and short-circuit protection. Compared with the same resettable polymer positive temperature coefficient (PPTC) devices, they have a much faster response speed, can be directly reset by external logic signals, and can maintain low on-resistance even after multiple trip events. The TCKE8xx series are divided into three categories: no overvoltage VOVC protection, 5 V (VOVC = 6.04 V) and 12 V (VOVC = 15.1 V).
In February, the Japanese company ROHM announced the launch of its BV2Hx045EFU-C series of high-voltage (41V) dual-channel high-end switches. They are optimized for automotive ECUs in transmission control, engine control, and other vehicle systems. The company said: "Unlike traditional fuses, IPD [Intelligent Power Devices] used as semiconductor fuses can protect circuits without degradation or damage, thus realizing a maintenance-free system." These devices are the first in the industry to provide independent overcurrent protection. High-end IPD. This series can protect the system from "surge" and "steady-state" overcurrent. The protection range can be adjusted by external components.
A recent report predicts that the global circuit protection market will be valued at US$65.45 billion by 2026, with a compound annual growth rate of 7.1% since 2019. The main driving factors identified in the report include: the development of the automotive electronics market, the growing Internet of Things (IoT) market, the development of the global electronics industry, the rapid growth of smart portable devices, and the increasing awareness of user safety, resulting in Demand for more advanced circuit protection technology. However, rising prices of raw materials used to manufacture circuit protection devices are inhibiting the growth of the global circuit protection market. Strict government regulations related to the use of SF6 circuit breaker technology are another key challenge for market growth.
Author: Robin Mitchell | 12-01-2021
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