Adjustable circuit device and voltage measuring device

Abstract

The invention provides an adjustable circuit device, comprising a first adjustment circuit, a second adjustment circuit, a signal conditioner, an analog-to-digital converter and a processor, wherein the processor receives the output signal converted by the signal conditioner and the analog-to-digital converter and analyzes the digital signal according to the pre-set rules; the equivalent capacitance of the first adjustment circuit is adjusted by the transmission of the control signal to control the opening and closing state of each switch in the first regulating circuit to realize the input or the cut of the adjustable capacitor according to the analysis result; and the fixed capacitance is simulated into an adjustable capacitance by controlling the gear connection state of the multiplexer in the second adjustment circuit, changing the connected voltage divider resistor network tap position so as to adjust the voltage across the fixed capacitor. The device realizes the automatic adjustment of the partial voltage capacitance through the program control, can reduce the human input and greatly improves the working efficiency.

Description

technical field [0001] The invention relates to the field of circuit control, and more specifically relates to an adjustable circuit device and a voltage measuring device. Background technique [0002] Due to the low working voltage of semiconductor electronic circuits, voltage dividing resistors are usually used to divide and attenuate the high-voltage input signal. However, after the buffer is divided, there is an input capacitor Cin, and the voltage dividing resistor and the buffer input capacitor Cin form a low-pass filter network. , as the frequency of the input signal increases, the capacitive reactance of the buffer input capacitor decreases, and the voltage entering the buffer is attenuated, which limits the bandwidth of the input signal. In order to increase the bandwidth, a capacitor is connected in parallel to the voltage dividing resistor, and the high frequency passes through the capacitor to divide the pressure, such as figure 1 As shown, the voltage-dividing ...

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Problems solved by technology

[0003] In fact, due to the error of the voltage-dividing capacitor, there will be differences in the input capacitance of the buffer and the installation structure, which will lead to unequal time constants of the upper and lower voltage-dividing resistors and capacitors, resulting in uneven amplitude-frequency characteristics. Therefore, the voltage-dividing capacitor of each product needs to be checked. Fine-tuning, currently using adjustable capacitors for matching, adjustable capacitors have semi-circular fixed metal electrodes and movable semi-circular metal electrodes, ceramic or film or air is used as the dielectric in the middle, and the degree of overlap between the movable electrode and the fixed electrode is adjusted manually by tools Capacity, but using this manual adjustment method is time-consuming and laborious

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