Electromagnetic relay with coil transient suppression protection circuit and mounting method thereof

Abstract

The invention discloses an electromagnetic relay with a coil transient suppression protection circuit and a mounting method thereof. A relay coil is arranged at one side of a base; the positive electrode leading out rod and the negative electrode leading out rod of the coil are arranged in a penetrating mode on the base; the positive electrode leading out rod and the negative electrode leading out rod of the coil are respectively electrically connected with one end of the relay coil; the coil transient suppression protection circuit is arranged on a ceramic substrate and a coil transient suppression protection module is formed; the above coil transient suppression protection module is fixed on a bottom plate; a coil positive electrode pad of the coil transient suppression protection module and a power positive electrode pad are connected onto the coil positive electrode leading out rod via spot welding or bonding wire; and a coil negative electrode pad of the coil transient suppression protection module and a power negative electrode pad are connected onto the coil negative electrode leading out rod via spot welding or bonding wire. Thus, reliability of the electromagnetic relay can be improved, and the size of the electromagnetic relay can be reduced.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to an electromagnetic relay with a coil transient suppression protection circuit and an installation method thereof. Background technique [0002] When the electromagnetic relay is in use, when the coil is de-energized, the stored inductive energy can generate a surge voltage of up to 1500 volts on the DC power line. A large number of solid circuits (solid devices) are used in the circuit, so the relay coil must be suppressed to limit its voltage peak value to 50-80 volts. When the relay is de-energized, the transient suppression unit absorbs and dissipates the coil's energy. [0003] The transient suppression method of the sealed electromagnetic relay can generally adopt five combinations of diode, Zener diode, Zener diode, Zener diode-Zener diode, TVS tube (special transient suppression tube), and according to the circuit needs A reverse polarity protection diode is added to the ...

AI Technical Summary

Problems solved by technology

[0006] a) Continuous heating of the coil has a great impact on the reliability and load capacity of the coil suppression circuit and reverse polarity protection circuit, and may even exceed the nominal junction temperature of the circuit itself, causing the circuit to fail;

[0007] b) The coil leads of the relay are thinner and the transient suppression and reverse polarity circuit connections are less manufacturable, the operation is more difficult, and it is easy to cause hidden dangers such as coil damage and virtual welding, which reduces the reliability of the relay

[0008] c) For hermetically sealed relays, the flux used to connect the components with solder will cause pollution. When the suppression unit is wrapped inside the coil, the flux is not easy to clean. The pollution caused by the flux is likely to cause the relay to appear under sealed conditions. failure due to contact unreliability

[0009] e) The fixing method of the suppression unit of the above installation method can be realized by increasing the volume of the coil, or adding a suppression unit and a fixed piece on the relay frame or support plate, etc. It is difficult to realize in a small-volume relay, and it is easy to be affected by vibration, etc. In an environment where the suppression unit falls off, or cannot be installed inside the relay

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