Engineering machinery fuse burnout warning circuit

Abstract

The invention discloses an engineering machinery fuse burnout warning circuit, and belongs to the field of engineering machinery electrical technology. The circuit comprises a current-limiting resistor, a warning lamp and a field-effect tube, and the current-limiting resistor and the warning lamp are sequentially connected in series between the drain electrode of the field-effect tube and a groundwire; the source electrode of the field effect transistor is connected with a power supply and the power supply wiring end of a fuse, and the load wiring end of the fuse is connected with the grid electrode of the field effect transistor through an input resistor and is connected with the ground wire through a pull-down resistor; and a load is connected between the load wiring end of the fuse andthe ground wire. According to the invention, the problems that the warning lamp is not on when the fuse is burnt out and the load is damaged at the same time, and the voltage can be measured at the load wiring end after the fuse is burnt out to cause confusion to maintenance personnel can be solved.

Description

technical field [0001] The invention relates to the electrical technical field of construction machinery, in particular to a fuse burnout warning circuit for construction machinery. Background technique [0002] Construction machinery uses fuses as components for circuit overload protection. Usually construction machinery is equipped with a fuse burnout warning circuit. a kind of like figure 1 The construction machinery fuse burnout warning circuit shown includes a current-limiting resistor 03 and a warning light 04. The current-limiting resistor 03 and the warning light 04 are connected in parallel with the fuse 01. The power terminal a1 of the fuse 01 is connected to the power supply. The load terminal b1 of 01 is plugged with one end of load 02; the other end of load 02 is grounded; when working, if the warning light is on, it means that the fuse has been burned, reminding the staff to check and repair as soon as possible. However, there are the following problems in pr...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a fuse burnout warning circuit for construction machinery, which can solve the problem that the warning light is not on when the fuse is blown and the load is damaged at the same time, and the voltage can be measured at the load terminal after the fuse is blown, causing confusion to maintenance personnel. question

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