Broad pulse trigger type DC speed regulating system with overvoltage and overcurrent protection

Abstract

The invention discloses a direct-current speed adjusting system with an overvoltage and overcurrent protection circuit. The direct-current speed adjusting system is mainly composed of a transformer T, a rectifier filter circuit, a double-closed-loop control circuit connected with an output end of the rectifier filter circuit, a fine tuning circuit connected with the double-closed-loop control circuit, a voltage stabilizing circuit connected with an auxiliary side of the transformer T, and an output circuit. The direct-current speed adjusting system is characterized in that the overvoltage and overcurrent protecting circuit is arranged between the voltage stabilizing circuit and the output circuit and composed of a protecting chip U2, a triode VT1, a triode VT2, a triode VT3, a capacitor C8 and a diode D5, one end of the capacitor C8 is connected with a CONT pin while the other end of the same passes through a capacitor C9 and then is connected with a base electrode of the protecting chip U2, and an N pole of the diode D5 is connected with a VCC pin of the protecting chip U2 while a P pole of the same is connected with a TR1 pin of the protecting chip U2. The overvoltage and overcurrent circuit can automatically execute protection action when current or voltage on an electricity load is overloaded, so that the load and the direct-current speed adjusting system are avoided being damaged.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a wide-pulse triggered DC speed regulation system with overvoltage and overcurrent protection. Background technique [0002] At present, mechanization has been used in many production activities. Due to the requirements of mechanical processing and operation, the motor is often in the transition process of starting, braking, and reversing, so the time in the starting and braking process is largely It determines the production efficiency of the machine. In order to shorten this part of the time, the speed control system is currently used to achieve. However, the existing speed control system cannot protect the load and the speed control system itself in time when the grid voltage fluctuates. Contents of the invention [0003] The purpose of the present invention is to overcome the defect that the current speed control system used in production machinery cannot protect the load and t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the current speed control system used in production machinery cannot protect the load and the speed control system itself in time when the grid voltage fluctuates, and to provide a wide pulse trigger type with overvoltage and overcurrent protection. DC speed control system

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