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The working principle and basic introduction of reed relay

sohu | 05/07/2021

As a commonly used control component, the relay can use a smaller current to control a larger current, use a low voltage to control a larger current, use a low voltage to control a high voltage, and use a direct current to control alternating current. It can realize the isolation between the control circuit and the controlled circuit, and has been widely used in automatic control, remote control, and protection circuits. The traditional electromagnetic relay is an electrical relay that uses the suction force generated by the circuit in the input circuit between the electromagnet core and the connection. This kind of relay puts forward new requirements. As a new type of relay, the reed relay is used in many It can meet the needs of this kind of development.

Performance characteristics of reed switch relay

1. High reliability

The high failure rate of general relays is set at 50ppm, so in order to meet this requirement, the quality level of reed switches is much higher than the 50ppm requirement. But so far, there has not been any electromechanical device that can achieve this level of quality.

2. High security

The dry reed switch has excellent insulation performance. The insulation resistance of this switch can reach up to 1015Ω, that is, its leakage current can reach the level of 10-15A. Such a low leakage level has a wide range of applications in medical electronic equipment, such as Probes or pacemakers inserted into the human body, because these devices require no leakage current close to the heart, even microampere or submicroampere current can change the electrical performance of key parts of the heart.

3. High adaptability

The reed sensor is hermetically sealed. Because the switch component of the reed switch is air-tight bee and inert gas, it will not contact the external environment, so it can work in almost any environment without being sensitive to humidity and not affected by external air. Interference, etc.; at the same time, the reed switch has no special requirements for the ambient temperature, and has a wide temperature adaptability: the typical operating temperature range can be from -50°C to +150°C, and no special additional conditions, restrictions or costs are required .

4. Long life

Because the reed switch is a wear-free component and does not use a sliding component, there will be no metal fatigue phenomenon, ensuring practically unlimited mechanical service life. At the same time, because the contact made of inert precious metal rhodium has a high melting point, it can reduce the loss of arc power generation on the contact surface, so it is more resistant to wear and can maintain a longer working life. General reed switches can work up to a million times under low-level loads (less than 5V and lower at 10mA) (the life of OKI series reed switches is generally guaranteed to be more than 100 million times). This is equivalent to the number of micro-semiconductor devices.

5. Compact structure and small size

The reed switch can be installed in a limited space and is very suitable for miniaturized equipment. At present, the minimum size of the reed pipe has reached Ф2.0&TImes;11.0mm.

6. Superior electrical performance

Reed switch has a series of excellent electrical properties, such as its very low on-resistance when it is turned on, the typical value is as low as 50mΩ; its direct switching signal range can be from a few nanovolts to thousands of volts, and the current varies from a few nanovolts to thousands of volts. A to A, the frequency ranges from DC to 6GHz and so on.

7. High speed operation

Since each movable component has only a very small weight, the operating speed is very high, making the reed switch a component that can be used in transistor circuits or integrated circuits.
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