With the rapid development of the industry, with the development of new electric energy meters, magnetic latching relays have also ushered in rapid development. Relays have become an indispensable and important part of electric energy meters, with strong load capacity, small size, and high input and output isolation. , Low power consumption, low-temperature rise, and other characteristics, the market share is high, and is widely used, highly favored by producers, will inevitably bring industry prosperity.
The magnetic latching relay was first mainly used in IC card prepaid electricity meters and centralized meter reading systems. In recent years, magnetic latching relays have been widely used in composite switches of reactive power compensation devices. They are used in conjunction with thyristors in composite switches to become the main switching devices in reactive power compensation devices to switch high-current circuits. It can also be used in various home appliances and automatic control devices (such as smart home control systems, industrial control systems, etc.) applications.
The advantages of magnetic latching relays are analyzed below:
1. High reliability. Due to the strict selection of military-grade components for the magnetic latching relay, the reliability of the product has been greatly improved. All electrical connection contacts are connected by solid parts, and the working power supply of the magnetic latching relay adopts an independent power supply mode. , The various output signals of the magnetic holding relay are isolated and transformed without interfering with each other. The cables connected with various instruments and meters are double-shielded cables. As long as one end is reliably grounded, the interference introduced by the line can be effectively suppressed.
2. The magnetic latching relay can protect motors with various starting conditions, and has high operational reliability, such as motor overload and phase failure protection, grounding protection, and can realize centralized control by a central computer, improving the degree of automation of the power distribution system, and make the distribution system more reliable. Electricity, control system scheduling, and maintenance reach new levels.
3. The magnetic latching relay adopts the second-level temperature automatic compensation technology and the optimized circuit structure design technology on the basis of the full current law. The theoretical calculation accuracy requirements of the product in practical application are met. The three-stage differential amplifier circuit is adopted to eliminate the error caused by the output resistance of the Hall element being greater than the input resistance of the op-amp so that the sampling value can be reflected without distortion and meet the design requirements.
4. According to the principle of symmetry, the magnetic latching relay distributes the channel air gaps in the closed magnetic circuit in even numbers, strictly matches the technical parameters of the Hall element, and adopts a unique de-remanence circuit to improve the product. The ability to resist external magnetic interference adopts two-level temperature automatic compensation technology so that the product is not affected by the external ambient temperature and the offset changes. The fully enclosed anti-corrosion and dust-proof measures are adopted, but the Hall element in the air gap is not sealed, in order to avoid if a certain Hall element is damaged and cannot be replaced, even if a false value is adjusted without stress on the circuit, the symmetry is completely lost. principle, so the influence of eccentric error cannot be guaranteed.
With the help of the rapid development of new energy in the market, the magnetic latching relay industry has reviewed the situation and increased the transformation and upgrading of its own business, providing a good opportunity for the extension and development of the industry, so that its products can be used in photovoltaic power generation inverters, new energy control, and protection. System, distributed energy, energy storage equipment, DC switch electrical equipment, and other fields expansion.
Magnetic latching relays will be the direction of relay research and development, communication relays and relays have become the largest application market, and the third-generation magnetic latching relays have been widely used; solid-state magnetic latching relays use microelectronics technology, and products are developing towards intelligence and modularization. , the market demand is rising steadily; as the second-largest market for the application of magnetic latching relays, the amount of bicycles is increasing, and the variety is expanding rapidly.