High-speed digital output circuit with overcurrent protection and integrated circuit

Abstract

The invention discloses a high-speed digital output circuit with overcurrent protection and an integrated circuit. The high-speed digital output circuit with the overcurrent protection comprises a driving circuit, an output switch circuit, a current sensing switch circuit, an instantaneous discharge circuit and a delayed reset circuit; sampling of the current sensing switch circuit is output to currents of a load and the current sensing switch circuit is conducted when the currents exceed the protection current; the instantaneous discharge circuit starts discharging when the current sensing switch circuit is switched to be in a connecting state; the delayed reset circuit starts charging when the current sensing switch circuit is switched into a disconnection state; the driving circuit outputs a protective signal when the voltage of the instantaneous discharge circuit is lower than an overturn threshold value and receives an input level signal when the voltage of the delayed reset circuit is higher than the overturn threshold value and outputs the level signal to the output switch circuit; the output switch circuit is disconnected when receives the overcurrent protection signal to cut off the load and outputs a corresponding standard digital signal when receives the level signal. According to the high-speed digital output circuit with the overcurrent protection, overcurrent protection is achieved due to the fact that the load is cut by rapid discharging during overcurrent and repeat electrifying is controlled through slow charging.

Description

Technical field [0001] The present invention relates to the technical field of integrated circuits, in particular to a high-speed digital output circuit with overcurrent protection and an integrated circuit containing the high-speed digital output circuit. Background technique [0002] The high-speed digital output circuit can reliably feedback the operating status of electric vehicles in real time, for example, feedback key information such as the current speed of the vehicle and the current speed of the motor to the instrument and other vehicle equipment, low cost and high reliability, and can be widely used in electric bicycles , Electric cars, electric motorcycles, electric forklifts, etc. [0003] At present, the commonly used high-speed digital output circuit is for short-circuit protection. The frequently used solutions and defects are: [0004] 1) Recoverable fuse. When short-circuited, the circuit flowing through the recoverable fuse increases rapidly, which causes the fuse...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a high reliability, low cost and simple recovery process with overcurrent protection of high-speed digital output circuits and ICs

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