Relay sudden change impact resisting and protecting system and method thereof

Abstract

The invention discloses a relay sudden change impact resisting and protecting system and a method of the relay sudden change impact resisting and protecting system. The system comprises an alternating current zero crossing point detection circuit, a relay contact motion detection circuit, a time-delay circuit generating adjustable delay time and a processing circuit. The processing circuit comprises a relay trigger module, a first processing module, a first computing module, a second processing module, a storage module, a third processing module and a judgment module. According to the system and method, the alternating current zero crossing point detection point time can be combined, the trigger signal sending time sequence of a relay is adjusted according to the opening and closing motion delay characteristic of the relay after receiving of trigger signals and relay characteristics and load characteristics in practical application, the contact motion time of the relay can be prevented from being influenced by impact currents, and the service life of the relay is prevented from being influenced by the impact currents generated by loads.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a relay anti-sudden shock protection system and a method thereof. Background technique [0002] The relay is a basic load switching circuit. Because its instantaneous contacts are often connected in series with the load in the same circuit, the load characteristics have a great influence on the working state of the relay. Some loads will A large current impact will be generated, which will cause certain harm to the relay. For example, in the smart home system in the prior art, almost all smart home node controls are output by means of relay-driven loads, so there are a large number of smart home control nodes. Use a different type of relay. In the smart home products in the prior art, the operation control of the relay does not consider the load status and characteristics, and the relay is opened and closed in real time. However, the load in the smart home system, such as LE...

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Problems solved by technology

[0002] The relay is a basic load switching circuit. Because its instantaneous contacts are often connected in series with the load in the same circuit, the load characteristics have a great influence on the working state of the relay. Some loads will A large current impact will be generated, which will cause certain harm to the relay. For example, in the smart home system in the prior art, almost all smart home node controls are output by means of relay-driven loads, so there are a large number of smart home control nodes. Using different types of relays

In the smart home products in the prior art, the operation control of the relay does not consider the load status and characteristics, and the relay is opened and closed in real time. However, the load in the smart home system, such as LED lights, is a switching stabilized power supply, so it belongs to Capacitive loads, and refrigerators are inductive loads due to the use of motors. Because the capacitive load is equivalent to a short circuit at the moment of power-on, and the motor is at the moment of starting, because the speed of relative motion between the stator and the rotor is almost zero, that is, there is no Cutting the movement of the magnetic field will not generate counter electromotive force in the circuit. Therefore, when the relay is closed and connected to the AC circuit at the moment of AC power supply, the load in the smart home system will often generate a large inrush current. Such a large sudden impact It is very unfavorable to the reliable operation of the relay, especially in the occasion of real-time operation of the relay opening and closing, because the relay acts randomly, it directly bears the sudden sudden impact current, resulting in irreversible damage to the instantaneous contact of the relay, so that the relay cannot respond to the operation instructions. As a result, the overall failure of the smart home node control circuit

In order to solve this problem, the maximum value of the inrush current is usually considered in the selection of relays in the prior art, which not only increases the hardware cost and product volume, but also the service life of the relay varies greatly under different load conditions, making it difficult to achieve the ideal use condition of the product

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