Novel voltage divider

Abstract

The invention provides a novel voltage divider. The novel voltage divider comprises a voltage dividing assembly, a sampling resistor, a controller, a communication part and an output part. The voltage dividing assembly comprises N voltage dividing units which are sequentially connected in series, and the N is 2-100. The negative electrode of the previous voltage dividing unit is connected with the positive electrode of the next voltage dividing unit, the positive electrode of the first voltage dividing unit is connected with an outside high voltage input line, the negative electrode of the last voltage dividing unit is connected with one end of the sampling resistor, and the other end of the sampling resistor is connected to the ground. Each voltage dividing unit comprises a voltage dividing resistor and a switch part, and the switch parts are in parallel connection with the voltage dividing resistors and are connected with the controller through the communication part. The two ends of the sampling resistor are respectively connected with the controller and the output part. The novel voltage divider is concise in overall structure, a control part is used for controlling the switch parts to be connected and disconnected so that different numbers of the voltage dividing units can be connected in series, hence, the size of the total resistance in the voltage dividing assembly can be controlled, the voltage division ratio can be adjusted automatically according to measured voltages, and practicability is high.

Description

technical field [0001] The invention relates to the field of voltage dividers, in particular to a novel voltage divider whose voltage division ratio can be automatically changed according to the measured voltage. Background technique [0002] A voltage divider is a basic measurement device that steps down and samples the measured voltage proportionally, and is widely used in real life. [0003] Existing voltage dividers are divided into two types: resistive and capacitive, respectively as figure 1 as well as figure 2 As shown, the ratio of the high-end impedance to the low-end impedance is the voltage division ratio. When the measured voltage is relatively high, the resistance value of the high-end resistor is large, and the voltage division ratio is also large; when the measured voltage is relatively low, the resistance value of the high-end resistance is small, and the voltage division ratio is also small. [0004] The existing voltage divider generally selects the app...

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Problems solved by technology

[0004] The existing voltage divider generally selects the appropriate voltage division ratio according to the maximum value of the measured voltage, and the voltage division ratio cannot be too small, otherwise the detection voltage obtained by the voltage division may be too high and exceed the range of the detection instrument; The voltage ratio should not be too large, otherwise the detection voltage obtained from the voltage division may be too low and the detection accuracy will be reduced, because once the voltage divider is selected, its voltage division ratio cannot be changed, so when the measured voltage changes in a large range, especially When the measured voltage is much lower than the maximum value, the measurement accuracy will be greatly reduced

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