Relay integrated circuit with pre-charging and short-circuit protection functions

Abstract

The invention relates to the related field of relay integrated circuits, in particular to a relay integrated circuit with pre-charging and short-circuit protection functions. The circuit comprises a battery module, a fuse, a relay contact, an armature, electromagnets K1-K3, coils N1-N3, current-limiting resistors Z1-Zj, MOS tube switches S1-Sj, current-limiting resistors R1-Ri and MOS tube switches Q1-Qi. Compared with an existing relay pre-charging circuit, the on-off and magnitude of the current in the pre-charging circuit of the invention can be controlled through series combination and on-off of the current-limiting resistors Z1-Zj and the MOS tube switches S1-Sj, and pre-charging parameters are adjustable; a short-circuit protection effect on a main circuit is achieved through the control circuit of the relay integrated circuit, and the fuse in the main circuit is not damaged; and according to the magnitude of short-circuit protection current in actual use, the control circuit controls the series combination and on-off of the current-limiting resistors R1-Ri and the MOS tube switches Q1-Qi so as to realize adjustable short-circuit protection parameters.

Description

technical field [0001] The invention relates to the related field of relay integrated circuits, in particular to a relay integrated circuit with self-precharging and short-circuit protection. Background technique [0002] The current battery module circuit relay scheme is that the positive pole of the battery module is first connected to the fuse, and then connected to the positive pole of the main relay, and then the negative pole of the main relay is the positive pole of the power terminal; at the same time, the pre-charging resistor is connected in series with the pre-charging relay Finally, it should be connected in parallel with the main relay. [0003] When the battery module starts to work, the pre-charging relay is first turned on, and when the pre-charging of the capacitor at the power end reaches the target value, the main relay is turned on again. After the main relay works stably, the pre-charging relay is finally turned off, leaving only the main relay. The rel...

AI Technical Summary

Problems solved by technology

[0004] When an accidental short circuit occurs in the working circuit of the battery module, the current in the circuit is very large at this time, and the fuse reaches the fusing condition due to exceeding the working current and is damaged. If the working circuit of the battery module is repaired, it needs to work again. Replace the fuse again. The fuse cannot be used again due to damage. To solve this problem, a relay integrated circuit with pre-charging and short-circuit protection is designed.

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