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Table 3 RS-232 Transfer Protocol Bit Identification Table 3 RS-232 Transfer Protocol Bit Identification Using this method, each of the four values that are transferred has 10 total bits worth of data. The 10 bits are enough to approximate the actual current and voltage values. The formula's used to code and decode the data are given below. Coding coded value uncoded value max size upper range where uncoded value the value that the sensors pick up max size 2A10 -1 1023 upper range 180 for...
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A small positive signal and a small negative signal are produced. The signals are the same polarity in order that they can be added together. The added signal is buffered from the resistive divider so other circuit resistances do not affect the scaling factor. This is achieved by using a unity-gain op-amp for the positive signal and an inverting unity-gain op-amp for the negative signal. These signals are mixed and fed into a non-inverting op-amp with a variable gain such that the controller...
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FIG. A4 INVERTER VOLTAGE amp CURRENT SENSING AND PROTECTION CIRCUITRY 1 OF 2
Faculty Advisors
Department of Electrical Engineering e-mail enjeti ee.tamu.edu Department of Electrical Engineering e-mail mbyeary ee.tamu.edu Department of Electrical Engineering e-mail howze ee.tamu.edu Department of Mechanical Engineering e-mail cculp esl.tamu.edu
Design Rational and Feature Description
3.1 Fuel Cell Rational and Requirements Fuel Cells for distributed power have many advantages. Environmental acceptability, efficiency, distributed capacity fuel flexibility and cogeneration are reasons why the fuel cell should be promoted as the next generation of power. The following is a list of advantages of fuel cells Environmental Acceptability - Because fuel cells are so efficient, CO2 emissions are reduced for a given power output. Fuel cell power plants are projected to decrease CO2...
V Vqz
The DC input from the fuel cell 48 VDC nominal, 50 , -12.5 is first converted to a regulated 400 VDc using a high frequency DC-DC converter. The DC-DC conversion stage consists of a high-frequency transformer. Isolated primarily for safety, system protection, and to meet the stringent FCC Class-A standards. The 400V DC-DC converter output is converted to 120V 240V, 50 60 Hz, singlephase AC by means of a pulse width modulation PWM driven IGBT, inverter stage. An output-LC filter stage is...
Info Kpa
Bill 100V Ch2 100V M 100JJS A Chi J 10.0V 15 J un 2001 B-K 0.00000 S 11 23 38 15 J un 2001 B-K 0.00000 S 11 23 38 DC-DC converter Figure 3. shows the DC-DC converter topology. Figure 19 shows the test results and the input amp output waveforms. The 42VDC input from the high current DC power supply is at 49V. Figure 19 shows the DC-DC converter output voltage Vd1 and Vd2 obtained during the experiment. It is clear that the DC-DC converter output is 200V. DC-AC Inverter Figure 20 below shows the...
On
vL - inductor voltage N1 - primary turns N 2 -secondary turns VD -input voltage Vo - dc output voltage t - time and the inductor current increases linearly. During the interval A when both the switches are off, the current splits equally between the secondary half windings and v0 0. V L - V0 tON lt t lt t ON A The next half cycle consists of toN during which T- is on and the interval A. The waveforms repeat with a period of V2 Ts 4-D 0 lt D lt 0.5 3 where D tON Ts is the duty ratio of the...
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Appendix C DSP code All .c and .h files
Texas Nstruments
Tl introduces industry s highest performance motor control DSPs With performance reaching 40 million instructions per second MIPS , TI's newest devices in the TMS320C24x DSP platform give motor control and motion control designers an immediate 30 percent performance increase over existing solutions from TI. Five new devices bring the C24x DSP generation to 13 fully code-compatible flash and read only memory ROM derivatives, making it the largest DSP portfolio dedicated to motor control. Target...
Info Nve
which yields a TON 22.5p,s, TOFF 2.5p,s. Power input to the DC-DC converter, Pin is The primary current under minimum fuel cell input voltage 42V conditions, Iin is Inn 263 A For a duty cycle of 0.9, RMS of the primary current is To obtain 1.0V at 400A, current sensing resistor Rs 0.0025Q is used. We shall use 4 power resistors rated 0.01 Q, 75W in parallel See DC-DC converter schematic in AppendnxA . Accounting for voltage drops on the secondary side, the transformer secondary voltage is 410V....
Figure Schematic of the TAMU Fuel Cell Inverter System
Figure 2 Block Diagram for DC-DC Converter Control Figure 2 shows the block diagram for the current control of the DC-DC converter. The Power Available signal analog from the fuel cell is used to adjust the current limit setting of the DC-DC converter. This ensures that the power drawn from the fuel cell does not exceed its capability. The remaining power is then provided by the battery backup system Figure 1 . The inverter, on the other hand, determines the actual power drawn by the loads and...
Info Rzm
II 34 A 16 1 1.22 V 7 Therefore, the largest component of the capacitor current ic is the fundamental frequency current, the rms For a voltage ripple DVc less than 5 or 10V, Bulk capacitors 4500 F are selected for this design. The rms current isA is 41.7A. Thus, rms current rating of each switch is
V Dnq
MOSFETs rated 100V, 100A with 2 devices in parallel in each leg are selected. For obtaining an output voltage of 400VDC for the push-pull converter, a turns ratio of K 5 is selected for the transformer. Center taps are available on both the primary and secondary sides as shown in Figure 2 at the beginning section 3.3. The VA rating of the transformer is defined as the sum of the total primary and secondary winding VA divided by two, 1.5 Vm.Im 1.5.42.265 16695 W 11.0WA 7 Voltage ratings of the...