In power systems and electronic equipment, a relay is a common control element used to turn circuits on or off.
However, there are times when the supply voltage is lower than the pick-up voltage of the relay, causing the relay to not work properly.
To solve this problem, we can adopt a strategy of giving the relay a starting voltage at the beginning to engage it, and then letting the relay work reliably at a lower supply voltage.
The starting voltage of a relay is the lowest voltage that can move the relay from an off state to a pick-up state.
The pick-up voltage refers to the voltage that can maintain the normal operation of the relay after it enters the pick-up state. Typically, the start-up voltage will be slightly higher than the pick-up voltage.
When the supply voltage is lower than the pick-up voltage, the relay may not work properly.
This is because the supply voltage is not enough to overcome the reaction force of the relay, so that the contacts cannot be closed and the circuit cannot be switched on.
In order to solve the problem that the supply voltage is lower than the pick-up voltage, we can adopt a start-up strategy.
The basic idea of this strategy is to give the relay a starting voltage at the beginning to engage and then let it operate at a lower supply voltage.
Here's how to do it:
When the power supply voltage reaches the starting voltage, the starting voltage is added to the relay through the control circuit to make the relay engage.
After the relay is engaged, the control circuit cuts off the starting voltage and adds the supply voltage to the contacts of the relay.
At this point, since the relay has been engaged, the contacts have been turned on, and the circuit has been turned on.
When the supply voltage drops below the pick-up voltage, the circuit remains on because the relay has been engaged and the contacts have been turned on.
In this way, the reduction of the supply voltage will not affect the normal operation of the relay.
The key to this start-up strategy lies in the design of the control circuit and the implementation of the control method.
The control circuit needs to control the application and cutting off of the starting voltage according to the change of power supply voltage and the state of the relay to ensure the normal operation of the relay.
The advantages of adopting a startup strategy are mainly reflected in the following aspects:
It solves the problem that the power supply voltage is lower than the pick-up voltage, and improves the reliability of the relay.
It reduces the requirements for power supply and facilitates the design and selection of power supply.
The design of the circuit is optimized, and the efficiency and stability of the circuit are improved.
The service life of the relay is extended and the failure rate is reduced.
Relays are an important control component in power systems and electronic equipment.
In order to ensure the proper operation of the relay, we need to adopt a suitable strategy to deal with the problem of the supply voltage being lower than the pick-up voltage.
By giving the relay a starting voltage at the beginning to make it engage, and then letting the relay work reliably at a lower supply voltage, we can solve this problem, improve the reliability and stability of the relay, optimize the design of the circuit, extend the service life of the relay, and reduce the failure rate.
This is of great significance for the proper functioning of power systems and electronic equipment.
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