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1 Overview
With the rapid development of integrated circuits, various true RMS AC/DC converters have appeared in recent years. The AD736 of the American AD company is one of them.
In scientific practice and production practice, a large number of non-sinusoidal waves are encountered. Traditional measuring instruments use the average conversion method to measure them, but this method has a large theoretical error. In order to achieve accurate measurement of the rms voltage of the AC signal and to be free from the measured waveform, a true rms conversion technique can be used, that is, the RMS value of the AC signal is directly converted to DC without the average conversion. signal. In order to meet the needs of modern electronic measurement, the current multimeter measuring the true RMS value of the AC voltage has been rapidly developed. The true rms value of the AC voltage is obtained by the operation of the circuit to calculate the squared → averaged → squared input AC voltage. The biggest advantage of a true rms meter is the ability to accurately measure the rms values ​​of various voltage waveforms without regard to the parameters and distortion of the waveform being measured.
The AD736 is a laser-corrected monolithic precision true-RMS AC/DC converter. Its main features are high accuracy, good sensitivity (200mVRMS full scale), fast measurement rate, good frequency characteristics (operating frequency range up to 0 ~ 460kHz), high input impedance, low output impedance, wide power supply range and power consumption. The low maximum power supply operating current is 200μA. The integrated error of measuring the sine wave voltage is not more than ±3%.
2 working principle and pin function
The internal block diagram of the AD736 is shown in Figure 1. It is mainly composed of input amplifier, full-wave rectifier, RMS unit (also known as RMS core RMS CORE), bias circuit, output amplifier and so on. The 2 pin of the chip is the input signal of the signal VIN. During operation, the measured signal voltage is applied to the non-inverting input of the input amplifier, and the output voltage is full-wave rectified and sent to the RMS unit and converted into a representative rms value. The DC voltage is then output through the Vo terminal of the output amplifier. The function of the bias circuit is to provide a suitable bias voltage for each unit circuit inside the chip.
Bidirectional DC Power Supplies
The BPS series of bidirectional programmable power supplies are high-precision, low-ripple and fast response speed bidirectional DC Power Supplies with an all-digital signal control loop designed by iDealTek-Electronics based on IGBT high-frequency switching technology and bidirectional AC/DC topology architecture.
Different from the traditional DC power supply which only has constant voltage and constant current working modes, this series of programmable bidirectional AC DC power supplies have both power supply and load characteristics. It has multiple working modes of constant voltage, constant current, constant resistance and constant power, and can realize dual quadrant operation to allow the energy of the measured object to be fed back to the power supply. And Bidirectional AC-DC Power Supplies have built-in function generator, can freely generate arbitrary waveforms.
This Bidirectional DC Power Supplies are featured for high reliability, efficient setting function and complete protections, also supporting the requirement of parallel connection of multiple-units to achieve output power rating expansion, making this bidirectional power supply the best choice for the cutting-edge application industry for automated testing, automotive production line manufacturing testing, photovoltaic plate aging testing and various DC power supplies.
This series of bidirectional DC power supplies adopt active power factor correction technology, which is specially designed for typical 380V and 480V AC two-phase or three-phase alternating current with the rated output power ranging 5KW / 10KW / 15KW, the maximum output voltage ranges from 80V to 2000V under different rated powers, and the bidirectional power can be flexibly adjusted. It can output a higher voltage at a lower current or a higher current at a low voltage while maintaining within the maximum rated power range.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com