System, method and device for amplifying secondary output weak voltage of voltage divider

Abstract

The invention discloses a system, a method and a device for amplifying secondary output weak voltage of a voltage divider. The system comprises an inverting amplification system and a boosting system,the inverting amplification system comprises an operational amplifier, a first resistor and a second resistor, the boosting system comprises a booster, the first resistor is connected with the secondresistor in series, and the second resistor is connected with the operational amplifier in parallel; a voltage booster is provided with a plurality of sections of windings which are wound according to the mode of an inductive voltage divider, feedback voltage is led out from the last section of winding of the plurality of sections of windings, and the feedback voltage is fed back to the in-phaseinput end of the operational amplifier.

Description

technical field [0001] The present invention relates to the field of electrical measurement, and more specifically, to a system, method and device for amplifying the secondary output weak voltage of a voltage divider. Background technique [0002] Voltage divider is a special instrument for high voltage measurement. Due to its advantages of accurate test, good linearity and stable performance, it is widely used, so the annual inspection volume is relatively large. During detection, there is a high voltage output above 100V in the secondary voltage of the voltage divider sent for inspection. When the electronic voltage divider is used to test the test product, because its secondary output signal voltage is low, generally within 15V, the signal needs to be amplified to be the same as the secondary voltage output of the test product for the secondary high voltage difference measurement of the test product. If the electronic voltage divider standard is used to connect the elect...

AI Technical Summary

Problems solved by technology

If the electronic voltage divider standard is used to connect the electronic circuit to directly output high voltage, when the core component of the circuit fails, the highest DC voltage of the circuit power supply will be directly output and added to the external load, which may cause damage to the back-end connected equipment

If the voltage is amplified by the secondary connection of the isolation transformer through the electronic voltage divider standard, due to the existence of the output internal resistance of the transformer, when the load is connected, a certain voltage drop will be caused, which will bring load errors, which will affect the standard secondary voltage divider. The accuracy of the secondary output

[0003] In view of the existence of the above-mentioned existing technology in the above-mentioned prior art, the use of an electronic voltage divider standard to connect the electronic circuit to directly output high voltage may cause damage to the back-end connection equipment. The secondary connection of the electronic voltage divider standard to the isolation transformer to amplify the voltage will affect The technical problem of the accuracy of the standard secondary output of the voltage divider has not yet proposed an effective solution

Images