1. Introduction to magnetic latching relays The magneti […]
1. Introduction to magnetic latching relays
The magnetic latching relays is also a kind of relay, but it has more stable performance than other relays, and has a smaller volume and a stronger carrying capacity. The magnetic latching relays is essentially an automatic switch that can automatically turn the circuit on or off. It usually maintains a stable state by the magnetism of the permanent magnet. If it needs to be converted, it only needs to be excited by a pulse signal.
2. Principle of magnetic latching relays
The contact of the magnetic latching relays is in a stable state due to the magnetic force of the permanent magnet. If it is necessary to switch the switching state of the contact, it is only necessary to apply a DC pulse voltage to the coil. Figure 1-4 shows the transition of the magnetic latching relays from the "reset" state to the "set" state. Figure 1 shows the reset state of the magnetic latching relays. In Figure 2, the coil J2 is straightened. The pulse voltage is generated; since the magnetic pole excited by the coil J2 interacts with the magnetic pole of the permanent magnet, the same polarity repels and the opposite sex attracts, so the state shown in FIG. 3 is generated; in FIG. 4, the pulse disappears and the relay is completed. Resets the transition from the "state" to the "set" state.
3. magnetic latching relays selection
There are three factors to consider in the selection of magnetic latching relays. The first is whether the current and voltage provided by the control circuit meet the requirements of the relay for voltage and current; the second is the need for several sets and types of contacts, considering whether the size of the existing relay is suitable; the third is to consider the volume of the appliance. Consider the installation and layout of the board.
4. Maintain relay contact form
A rectangular frame is used in the circuit to indicate the coil of the relay, with the symbol "J" on the side. The contacts of the relay have two expressions in the circuit: one is to draw the contacts on one side of the rectangular frame, and the other is to draw the contacts in their respective control circuits and mark them with text symbols. the difference.