Sensitivity improving circuit

Abstract

The invention provides a sensitivity improving circuit comprising a motor driving module, a first input end of which is connected with a first input power supply and a second input end of which is connected with an output end of a main control module; the input end of the first operational amplifier module is connected with the output end of the motor driving module, and the output end is connected with the first input end of the main control module; the input end of the second operational amplifier module is connected with the output end of the motor driving module, and the output end is connected with the second input end of the main control module; the first operational amplifier module and the second operational amplifier module respectively amplify the detection current in the ascending and descending processes of the lifting system based on different amplification factors so as to amplify the variable quantity of the detection current when the lifting system touches an object, and represent the detection sensitivity when the lifting system touches the object through the variable quantity. The circuit has the beneficial effects that a double-path operational amplifier algorithm is adopted, and the rising current and the falling current are respectively amplified by adopting the two operational amplifier modules with different amplification factors, so that the detection sensitivity when a lifting system touches an object can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of current amplification, in particular to a sensitivity boosting circuit. Background technique [0002] With the continuous expansion of the market for lifting tables / lifting beds, the requirements for customer experience are getting higher and higher, and the basic demand must have a fallback function. There are two existing technologies, namely current detection and six-axis sensor detection. Traditional The sensitivity of the current detection method is low, and the cost of the six-axis sensor is very high, and there are certain limitations, which makes the market cost pressure more and more intense, and requires the product to be more cost-effective; [0003] At present, the conventional current detection amplifying circuit adopts a single-channel op amp algorithm, and the rising and falling can only amplify the same multiple at the same time. Due to the upper limit of the MCU sampling, the falling curr...

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Problems solved by technology

[0002] With the continuous expansion of the market of lifting tables / lifting beds, the requirements for customer experience are getting higher and higher, and the basic needs must have the function of falling back in case of resistance. There are two existing technologies, namely current detection and six-axis sensor detection. The traditional The sensitivity of the current detection method is low, and the cost of the six-axis sensor is very high, and there are certain limitations, which makes the market cost pressure is also increasing, and the product is required to be more cost-effective;

[0003] At present, the amplifying circuit of conventional current detection adopts a single-channel operational amplifier algorithm, and the rising and falling can only be amplified by the same multiple at the same time. Limited by the upper limit of MCU sampling, it is impossible to amplify the falling current to the greatest extent, and it cannot effectively improve the lifting system. Sensitivity to touch objects

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