AC intelligent switch with multiple protection functions

Abstract

AC smart switch with multiple protection functions. The invention discloses a current overload control and protection method. The method comprises the following steps: 1) sampling the current; 2) judging whether the current value is within a set range; 3) judging the number of previous overcurrents; 4) according to The result of step 3) determines the working state of the motor, wherein the setting range refers to the range between the overcurrent current threshold 1 and the threshold 2, and the threshold 1 is greater than the threshold 2. In addition, a new type of intelligent AC switch is disclosed, including a power input part, a mechanical switch, a control chip, a thyristor execution part and a motor connection port, and a loop current detection sensor is arranged on the main circuit, and the signal input of the sensor is connected to the chip signal input port. In another embodiment, a detection signal line is also connected from the switch for brush position detection. The soft start function is added to the AC integrated intelligent switch of the present invention, so that the motor runs more stably.

Description

technical field [0001] The invention belongs to the field of intelligent control of AC electric tools, and in particular relates to a novel intelligent integrated multifunctional AC intelligent switch. Background technique [0002] 1. The current tools use a common on-off switch, or an on-off switch plus a control module. This control method has the following defects: After the tool is blocked, it is easy to cause the motor to fail due to overload, and gradually increased overload in the market. The control module is used to reduce the proportion of motor failure after overload. The specific implementation method is generally as follows: when the motor load current reaches the set overload current, the control module cuts off the output, and the tool stops working to protect the motor. Although this control method greatly reduces the ratio of tool burn-in, it reduces the user's work efficiency. Because the tool will stop working after each overload, the switch needs to be ...

AI Technical Summary

Problems solved by technology

[0002] 1. The current tools use a common on-off switch, or an on-off switch plus a control module. This control method has the following defects: After the tool is blocked, it is easy to cause the motor to fail due to overload, and gradually increased overload in the market. Control module to reduce the proportion of motor failure after overload

[0004] 2.1. Ordinary brushes: When the brushes are worn to the point where they are about to break down, the sparks of the motor will increase. Once this phenomenon occurs, the service life of the brushes will be seriously reduced after the brushes are replaced again.

[0005] 2.2. Mechanical automatic pop-up power-off brush: because the entire mechanical mechanism takes up a lot of space, the effective use length of the brush is reduced, the tool use time is reduced, and the cost is high

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