U of M ECE 4501 - DC/DC SWITCHING CONVERTERS (11 pages)

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DC/DC SWITCHING CONVERTERS



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DC/DC SWITCHING CONVERTERS

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Pages:
11
School:
University of Minnesota- Twin Cities
Course:
Ece 4501 - Senior Elective

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ECE 4501 Power Systems Laboratory Manual Rev 1 0 8 0 DC DC SWITCHING CONVERTERS 8 1 DC DC STEP DOWN POWER SUPPLY 8 1 1 PRE LAB DESIGN It is desired to design and build a simple Firing Control Circuit for a Pulse Width Modulation PWM Chopper The circuit will consist of three modules as shown below FIGURE 8 1 Build the following modules on a prototype board for use in Lab 8 Make sure that all Vcc and Ground connections come from a common rail Vcc and ground potentials will be provided in the laboratory Clock Module Use a 555 Timer resistors and capacitors to construct an Astable Multivibrator which oscillates at or around 16000 Hz You may substitute any oscillator circuit of your choice as long as it can be adjusted easily to run at 600 and 16000 Hz with an output oscillating between Vcc and ground MOD 16 Counter Connect a 74LS169 chip to up count by modulo 16 0000 1111 Use the output of the Clock Module as the clock input Bias the U D Load etc Pins to produce a standard up count Again any chip will do as long as it counts N MOD 8 where N can be 1 2 3 etc Combinational Circuit Design a combinational circuit that uses the 4 outputs of the MOD 16 counter or 3 outputs of a MOD 8 counter etc as inputs and creates the following output signals 1 ECE 4501 Power Systems Laboratory Manual Q3 Q2 Q1 Q0 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Output A 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Output B 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 TABLE 8A Output C 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 Rev 1 0 Output D 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 Each of the four output signals will represent a different Duty Cycle For example Output A is Logic 1 for 1 8 of the modulation period and thus 0 125 Output C is Logic 1 for the period and 0 5 You may use TTL chips or any other so long as they will work with Vcc 5 Volts Test the circuit to ensure proper function and bring it to lab at your designated time Only ONE circuit per lab group is necessary 8 1 2 OBJECTIVE To gain



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