AC-DC (Alternating Current Direct Current) small-current electronic load simulator

Abstract

The invention relates to an AC-DC (Alternating Current Direct Current) small-current electronic load simulator comprising a voltage controlled amplifier, a control operational amplifier, an error amplifier, an amplifier vibration absorbing circuit, a rectification vibration absorbing circuit, an RMS-to-DC (Root Mean Square to Direct Current) circuit, a programmed-control reference voltage circuit, an adder, a sampling resistor, a first current control transistor, a second current control transistor, a signal sampling circuit, a vibration absorbing circuit and a rectification circuit. The rectification circuit carries out polarity conversion on an input signal; the signal sampling circuit inputs an acquired AC signal into the voltage controlled amplifier, and the voltage controlled amplifier amplifies the acquired AC signal to control a current of an electronic load circuit, thus a function of simulating an AC-DC load resistor is achieved; the rectification vibration absorbing circuit and the amplifier vibration absorbing circuit are used for preventing high-frequency oscillation form generating on a power supply end when a small-current load is simulated; all leaked currents are added by the adder, RMS is converted into DC, the DC is compared with a programmed-control reference voltage and an error is amplified, and an error voltage controls the ratio of amplification of the voltage controlled amplifier, thus a function of stabilizing an input current is realized.

Description

technical field [0001] The invention relates to an AC / DC analog electronic load device, in particular to a high-precision AC / DC analog electronic load device which can be used for small currents. Background technique [0002] Leakage current is one of the main parameters for product safety testing of current electrical products, and its importance has surpassed that of insulation resistance testing. Relevant industry regulations The safe voltage is 36V, and the safe current is 10mA. The reasons are as follows: The degree of harm to the human body caused by electric shock mainly depends on the magnitude of the current passing through the human body and the length of the electrification time. The greater the intensity of the current, the greater the fatal danger; the longer the duration, the greater the possibility of death. The minimum current value that can cause people to feel is called the sensing current, the AC is 1mA, and the DC is 5mA; the maximum current that a perso...

AI Technical Summary

Problems solved by technology

Especially when verifying the AC active leakage current tester supplied by the mains, due to the fluctuation of the power supply, the readings of the sampling current and the leakage current are also constantly fluctuating, which may even cause inaccurate reading results

Moreover, due to the limitation of the leakage current tester to be verified, the adjustment is difficult, resulting in low verification efficiency

Images