Harmonic neutralized half-bridge inverter schematic and netlist. in Software

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Harmonic neutralized half-bridge inverter schematic and netlist.
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1 v(13)
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v(12)#a
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3 -40.0 496
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Plot1 v(12)#a in volts
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v(13) in volts
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1 10.5m 11.5m 12.5m time in seconds 13.5m 14.5m
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Fourier analysis for v(5): No. Harmonics: 10, THD: 0.929872 %, Gridsize: 200, Interpolation Degree:1 Harmonic -------0 1 2 3 4 5 6 7 8 9
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Frequency --------0 400 800 1200 1600 2000 2400 2800 3200 3600
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Magnitude --------0.000802049 69.0061 0.00413678 0.152741 0.00195197 0.0586701 0.0015346 0.0260316 0.00110158 0.61989
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Phase ----0 -6.8934 17.1877 86.0766 46.8701 76.1783 64.6708 -108.27 79.6249 69.068
Norm. Mag --------0 1 5.99481e-005 0.00221344 2.8287e-005 0.000850217 2.22386e-005 0.000377237 1.59635e-005 0.00898312
Norm. Phase ----------0 0 24.0811 92.97 53.7635 83.0717 71.5643 -101.38 86.5184 75.9614
Fourier and graphical results of the full-bridge inverter in Fig. 7.23.
C1 ramp 2200p Vramp R3 10k V1 15 R2 10k
5 10
X2 UC1637
+VTH CT -VTH AOUT ISET E/A OUT -E/A +E/A SD -C/L +C/L +AIN -AIN
R1 10k
negV V4
Tran Generators = SIN
Aout aout
negV
R4 10k Bout R8 10k ramp
V2 -15 R7 10k
bout
+VS BOUT +BIN -BIN
R5 10
negV
R6 10
R10 4.7K
aout
R11 47K C6 47N
sina
C5 8.2N
R9 4.7K
bout
R12 47K
sinb
C3 47N
C2 8.2N
Fourier and graphical results of the full-bridge inverter.
PWM Inverter.cir .TRAN .5u 15m 5m 1u UIC .FOUR 400 v(15) v(16) v(15,bout) .PROBE V(4) SD V(8) sinb V(15) sina C2 8 0 8.2N R1 14 negV 10k C1 0 ramp 2200p V1 6 0 DC=15 V2 negV 0 DC=-15 R2 10 5 10k R3 6 5 10k R4 10 negV 10k R5 11 9 10 R6 12 9 10 R7 11 negV 10k R8 6 12 10k V4 13 0 SIN 0 4.5 400 V3 4 negV PULSE 0 3m 150u X2 5 ramp 10 aout negV 6 bout ramp 12 ramp 11 2 2 4 13 9 9 14 UC1637 R9 bout 18 4.7K R12 18 8 47K C3 18 0 47N C5 15 0 8.2N R10 aout 16 4.7K R11 16 15 47K C6 16 0 47N .END
(Continued )
1 aout 2 bout 3 sina 4 sinb
1 -28.0 24.0 34.0 56.0 2
Plot1 aout in volts
bout in volts
sina in volts
sinb in volts
9.75m
10.3m
10.7m time in seconds
11.2m
11.7m
PWM inverter simulation results.
DC-to-AC Conversions
PWM Inverter A PWM inverter compares a control voltage with a triangle waveform, which is at the switching frequency. The switching frequency is much higher than the fundamental output frequency. Integrated circuit devices such as the UC3637 offer all the functions required, including a variable dead time control to avoid overlapping of the upper and lower switches. This controller is often used in motor control applications, but it can also be used for audio switching ampli ers, ultrasonics, or UPS applications. A simple example is shown in Fig. 7.25, with the simulation results shown in Fig. 7.26. A very low switching frequency is used in this example in order to provide a visual representation of the switched output. A simple two-stage RC lter is used to lter the output. In a typical application, the output lter would be an LC lter and UC3637 would be used to drive a power stage. PWM ampli ers are also available as hybrid devices and more recently as monolithic integrated circuit devices. In these devices, the entire control circuit and output stage are contained in a very small package. A good example of this type of device is the SA12 device, which is manufactured by Apex. Apex also provides SPICE model support for these devices.
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Power Factor Correction
There has been a growing interest in power factor correction (PFC). In fact, the European Union implemented a directive, EN61000-3-2, which controls the harmonic content and power factor of many products that are sold to European countries. There are several important reasons for this control. Poor power factor results in reduced ef ciency, which increases the cost of electricity. More importantly, many devices suffer from harmonically rich waveforms. A good example of this is motors, which may overheat as a result of harmonics. In the case of three-phase motors the harmonics can result in signi cant neutral current, which can also result in overheating and ultimately in motor failure. Typical switching power supplies rectify the input power and utilize a capacitor lter in order to provide a DC bus voltage. The typical power factor of such a conversion is approximately 0.6. Linear regulated power supplies generally use a transformer to step down the AC input voltage and rectify the secondary voltage and then utilize a capacitor lter to create the DC voltage to the input of the regulator stage. The transformer improves the power factor of the input just slightly from the typical switching power supply. Phase-controlled power supplies utilize either SCRs or triacs to control the conduction angle of the input, which is then ltered using an LC-type lter. This can result in a power factor that is even lower than the typical switching power supply. Power factor (PF) is de ned as the ratio of watts to volt-amperes:
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