A High Side Drive Overcurrent Protection Circuit Realized by Discrete Components

Abstract

The present invention discloses a high-side diving overcurrent protection circuit realized by employing discrete components. The high-side driving circuit employs an MOSFET power tube, the overcurrent protection circuit includes a current detection circuit connected in series with the high-side driving output current, the output level of the current detection circuit is connected with the input end of a current comparer U1, and the output end of the U1 is connected through a switch tube and controls the closing and opening of the MOSFET power tube of the high-side driving circuit. The voltage comparer is connected with a single-chip microcomputer through optic-coupling parts, and the single-chip microcomputer is connected with the switch tube through the optic-coupling parts to control the closing and opening of the MOSFET power tube of the high-side driving circuit. The high-side diving overcurrent protection circuit realized by employing discrete components is big in high-current driving output current and rapid in automatic protection response speed when the overcurrent is outputted without any damaging for the products themselves and the vehicles, and is low in cost.

Description

technical field [0001] The invention relates to high-side drive protection, in particular to a high-side drive overcurrent protection circuit realized by discrete components. Background technique [0002] In the application of construction machinery vehicles, many customers need to use the high-side drive output function, which brings convenience to the wiring of the vehicle-users only need to connect one end of the electrical load to the high-side drive output end, and the other end to the vehicle itself The big iron will do. However, the output current (below 3 amperes) and output voltage (below 40 volts) of the high-side drive solutions on the market are relatively small, and some of them do not have the drive output over-current protection function, which cannot meet specific needs, and most of them are Realized by professional integrated circuits, the cost does not have any advantages. Contents of the invention [0003] The object of the present invention is to prov...

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Problems solved by technology

However, the output current (below 3 amperes) and output voltage (below 40 volts) of the high-side drive solutions on the market are relatively small, and some of them do not have the drive output over-current protection function, which cannot meet specific needs, and most of them are Realized by professional integrated circuits, the cost does not have any advantages

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