Fan control circuit with overcurrent and short circuit protection functions

Abstract

The invention discloses a fan control circuit with overcurrent and short circuit protection functions, which comprises a power supply module and a switch module, and further comprises a fault signal output module. The fault signal output module comprises a current acquisition circuit and a comparison circuit; the current acquisition circuit comprises a sampling resistor R6, and the sampling resistor R6 is connected in series in the switch module; the comparison circuit comprises a resistor R15, a resistor R16, a resistor R17, a comparator U1A and a comparator U1B, the resistor R15, the resistor R17 and the resistor R16 are sequentially connected between a power source and the ground in series, the comparator U1A and the comparator U1B form a window comparator, an upper limit comparison voltage input pin and a lower limit comparison voltage input pin of the window comparator are connected to the two ends of the resistor R17 respectively, the input end of the window comparator is connected with the sampling resistor R6, and the output end of the window comparator can output a fault signal. The circuit can output fault signals in time when the fan works abnormally, so that maintenance is facilitated.

Description

technical field [0001] The invention relates to the technical field of machine tool cooling fan control, in particular to a fan control circuit with overcurrent and short circuit protection functions. Background technique [0002] With the rapid development of today's electronic technology, electronic components are constantly developing towards miniaturization and densification, and their own power is also constantly increasing, which makes the heat generated per unit area of ​​electronic products continue to increase. If the heat cannot be dissipated in time, it will The formation of local high temperature will cause electronic components to fail, affecting their working stability and service life. The heat dissipation capability of products is very important, so the air cooling design continues to lead the progress and innovation of the entire heat dissipation system market, and also affects the stability of product work. In order to increase the heat dissipation capacit...

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a fan control circuit with overcurrent and short circuit protection functions, which solves the problem that the existing fan circuit cannot detect the failure of the fan operation

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