Instruction Manual. High Power Factor PWM Converter with Power Regenerative Function (Stack Type). RHC-D Series. RHC132S-4DE to RHC315S-4DE. • The PWM converter is intended for use in combination with a Fuji inverter that drives a three-phase induction motor, and. Are free from damage. Before we start discussing how filter PWM signals, it may be worthwhile to review the basics of the PWM technique. Why PWM signals can be used to accomplish digital-to-analog conversion. When the term “PWM” is used, a key. And illustrations for this exposition are generated using free 'LTSpice' (for a copy, go to. Aug 16, 2012. Arduino's and other microcontrollers provide analog to digital (ADC) conversion to convert an input voltage to a digital value. You might think that they also provide the converse which is digital to analog (DAC) conversion. This is not the case. Instead they provide pulse-width modulated (PWM) outputs (see. What is a DAC? Choosing a DAC; Resistor String DAC. Weighted Resistor DAC; R-2R DAC; PWM. DAC associated errors; Applications; Conclusion. What is a DAC. A digital to analog converter (DAC) is a device that converts digital numbers (binary) into an analog voltage or current output. Choosing a DAC. There are six.

D/A and A/D Convertors E72 Lab #5 A/D & D/A (PWM) Convertors Make sure you read the about keeping the lab clean. In particular, put away all components, wires and connectors when you are done. If you need to leave a circuit set up on a breadboard, put the breadboard in one of the cabinets or drawers when you leave. The following might be useful: D/A and A/D convertors In this lab you will be working with Digital to Analog (D/A - read as ' D to A') and Analog to Digital (A/D - ' A to D') convertors. D/A convertors are used to generate an analog voltage from a number stored in the microcontroller. Free Download Jill Scott He Loves Me Lifetime. For example a three bit convertor with a range of 0-3.3 volts would have the following outputs.

Note that the highest output is actually 3.3V*(2 N-1)/2 N (where N is the number of bits, 3 in this case). A binary value of 110 (decimal=6) would ideally result in 2.475 Volts.

A/D Input Output Decimal Binary 2.8875V 7 111 For this part of the lab, use your daughterboard on a breadboard. With Vcc and ground applied. 1) Build a simple parallel D/A convertor The first task this week is to build a simple D/A convertor and evaluate its performance. Connect the circuit shown with R=10kΩ. Keep the resistors separate from the op-amp because we will be swapping in a different op-amp later. Download Ac3 Audio Codec Mac. Wire neatly (make the breadboard look like the schematic and things should go quickly).

Note: I have wires that will let you easily connect from LaunchPad to breadboard. Use a TLV2772 opamp powered from 0 and 5 volts. The pinout is given below. Write a program that sets P2.1, P2.2 and P2.3 as outputs. Create a variable ' i' that increments in a loop at about a 100 Hz rate. In the loop use the statement ' P2OUT = i;'.

This will increment the output of the D/A converter (note: only 3 bits of ' i' are important to the circuit, so there is no need to limit the range of ' i'). Predict and measure the output voltages as i varies. Note: you can pause the program, go to View→Locals, and change the value of i directly (or go to View→Registers, and change P2OUT manually). You can't view the registers while the program is running. Get a screen shot of the output as the program runs clearly showing the discrete analog voltage levels.

Replace the TLV2772 with an LF411 op amp, but keep power at +5V and ground (you'll have to rewire because they have different printouts), and redo the screen shot (note: it won't be nearly as good). 2) Using an A/D convertor Install the potentiometer (either 10k or 100k) on the E72 PCB, and install the PCB on the launchpad..

Download the following code (). The code is not thouroughly commented, but you should be able to figure it out. Compile and run the code. Your browser does not support inline frames or is currently configured not to display inline frames.

The code takes the input from the potentiometer on your microcontroller board which is connected to pin 1.3 and converts it with a 10 bit A/D converter. You can vary the voltage by turning the pot and use a voltmeter to measure the voltage on the appropriate pin. You can check the value of the conversion using by pausing the program and examining the value of the variables (y ou can't view the registers while the program is running). Take several measurements (at least 10) as the voltage is varied and fill in a table like the one below (but with more rows): Measured Voltage Expected A/D Value Measured A/D Value *IMPORTANT* Make sure you don't apply more than 3.3 volts to any input on the microcontroller, this can destroy the chip. 3) PWM We will be using SMCLK to control the PWM. The code sets P1.4 to SMCLK.