Version 4.1 SHEET 1 4292 2804 WIRE -1232 -176 -1344 -176 WIRE -1216 -176 -1232 -176 WIRE -1344 -128 -1344 -176 WIRE 816 -64 752 -64 WIRE 1200 -64 976 -64 WIRE 1408 -64 1200 -64 WIRE 1632 -64 1408 -64 WIRE 1632 -48 1488 -48 WIRE 1792 -48 1696 -48 WIRE 1824 -48 1792 -48 WIRE 2128 -48 1968 -48 WIRE 1488 -32 1488 -48 WIRE 1632 -32 1600 -32 WIRE 1968 -32 1968 -48 WIRE 320 -16 208 -16 WIRE 368 -16 320 -16 WIRE 816 -16 368 -16 WIRE 1072 -16 992 -16 WIRE 1280 -16 1072 -16 WIRE 1600 -16 1600 -32 WIRE 1632 -16 1600 -16 WIRE -1344 0 -1344 -48 WIRE 1600 0 1600 -16 WIRE 1632 0 1600 0 WIRE 1600 16 1600 0 WIRE 1648 16 1648 0 WIRE 1648 16 1600 16 WIRE 1600 32 1600 16 WIRE 208 48 208 -16 WIRE 816 48 816 32 WIRE 896 48 896 32 WIRE 896 48 816 48 WIRE 816 64 816 48 WIRE 1968 80 1968 48 WIRE 752 96 752 -64 WIRE 1072 96 1072 -16 WIRE 1072 96 752 96 WIRE 1488 96 1488 48 WIRE 1280 128 1280 -16 WIRE 1344 128 1280 128 WIRE 1632 128 1344 128 WIRE 1632 144 1488 144 WIRE 1792 144 1696 144 WIRE 1824 144 1792 144 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1904 WIRE -176 1904 -224 1904 WIRE 560 1904 480 1904 WIRE 672 1904 640 1904 WIRE -128 1920 -128 1872 WIRE -368 1936 -368 1904 WIRE -176 1936 -176 1904 WIRE 16 1936 16 1776 WIRE 480 1936 480 1904 WIRE 720 1952 720 1920 WIRE 896 1952 896 1792 WIRE 672 1968 672 1904 WIRE 720 1968 720 1952 WIRE -128 2032 -128 2000 WIRE 16 2032 16 2000 WIRE 16 2032 -128 2032 WIRE 1568 2032 1568 1984 WIRE 1584 2032 1568 2032 WIRE 1648 2032 1648 1984 WIRE 1680 2032 1648 2032 WIRE 1776 2032 1760 2032 WIRE -368 2048 -368 2016 WIRE -272 2048 -368 2048 WIRE -176 2048 -176 1984 WIRE -176 2048 -272 2048 WIRE 720 2048 720 2032 WIRE 896 2048 896 2016 WIRE 896 2048 720 2048 WIRE 480 2064 480 2016 WIRE 672 2064 672 2016 WIRE 672 2064 480 2064 WIRE 720 2064 720 2048 WIRE 720 2064 672 2064 WIRE -272 2080 -272 2048 WIRE 1440 2160 1408 2160 WIRE 1568 2160 1568 2032 WIRE 1568 2160 1520 2160 WIRE 1600 2160 1568 2160 WIRE 1776 2160 1776 2032 WIRE 1776 2160 1664 2160 WIRE 1792 2160 1776 2160 WIRE 1808 2160 1808 2112 WIRE 1808 2160 1792 2160 WIRE 1904 2160 1808 2160 WIRE 2032 2160 1984 2160 WIRE 2128 2160 2032 2160 WIRE 2160 2160 2128 2160 WIRE 2304 2160 2160 2160 WIRE -128 2192 -128 2032 WIRE -80 2192 -80 2144 WIRE -80 2192 -128 2192 WIRE 112 2192 -80 2192 WIRE 304 2192 192 2192 WIRE 1264 2192 384 2192 WIRE 1408 2192 1408 2160 WIRE 2304 2208 2304 2160 WIRE 2032 2224 2032 2160 WIRE 2128 2240 2128 2160 WIRE 720 2256 720 2064 WIRE 720 2256 640 2256 WIRE 1264 2256 1264 2192 WIRE 1408 2288 1408 2272 WIRE 1904 2288 1408 2288 WIRE -128 2320 -128 2192 WIRE 0 2320 -128 2320 WIRE 112 2320 0 2320 WIRE 208 2320 112 2320 WIRE 1408 2320 1408 2288 WIRE -128 2352 -128 2320 WIRE 720 2352 720 2256 WIRE 880 2352 720 2352 WIRE 1008 2352 880 2352 WIRE 1120 2352 1008 2352 WIRE 1264 2352 1264 2336 WIRE 1264 2352 1120 2352 WIRE 208 2368 208 2320 WIRE 2128 2384 2128 2320 WIRE 1120 2400 1120 2352 WIRE 1408 2432 1408 2400 WIRE 1440 2432 1408 2432 WIRE 1568 2432 1520 2432 WIRE 1616 2432 1568 2432 WIRE 1776 2432 1680 2432 WIRE 1792 2432 1792 2160 WIRE 1792 2432 1776 2432 WIRE -288 2448 -352 2448 WIRE -176 2448 -208 2448 WIRE 0 2448 0 2320 WIRE 112 2448 112 2320 WIRE 544 2448 464 2448 WIRE 672 2448 624 2448 WIRE 880 2448 880 2352 WIRE 720 2464 720 2432 WIRE 1008 2464 1008 2352 WIRE -128 2480 -128 2432 WIRE 464 2480 464 2448 WIRE 672 2480 672 2448 WIRE -352 2496 -352 2448 WIRE -176 2496 -176 2448 WIRE 208 2496 208 2448 WIRE 1904 2496 1904 2288 WIRE 1952 2496 1904 2496 WIRE 2032 2496 2032 2288 WIRE 2032 2496 1952 2496 WIRE 2128 2496 2128 2448 WIRE 2128 2496 2032 2496 WIRE 2304 2496 2304 2288 WIRE 2304 2496 2128 2496 WIRE 1120 2528 1120 2480 WIRE 1952 2528 1952 2496 WIRE 1568 2544 1568 2432 WIRE 1584 2544 1568 2544 WIRE 1664 2544 1648 2544 WIRE 1776 2544 1776 2432 WIRE 1776 2544 1744 2544 WIRE 464 2576 464 2560 WIRE 672 2576 672 2528 WIRE 672 2576 464 2576 WIRE 720 2576 720 2544 WIRE 720 2576 672 2576 WIRE 880 2576 880 2512 WIRE 880 2576 720 2576 WIRE -352 2592 -352 2576 WIRE -176 2592 -176 2544 WIRE -176 2592 -352 2592 WIRE -128 2592 -128 2560 WIRE -128 2592 -176 2592 WIRE 0 2592 0 2512 WIRE 0 2592 -128 2592 WIRE -128 2640 -128 2592 WIRE -48 2640 -128 2640 WIRE 112 2640 112 2512 WIRE 112 2640 -48 2640 WIRE 208 2640 208 2560 WIRE 208 2640 112 2640 WIRE 720 2640 720 2576 WIRE 720 2640 208 2640 WIRE 1008 2640 1008 2528 WIRE 1008 2640 720 2640 WIRE 1120 2640 1120 2592 WIRE 1120 2640 1008 2640 WIRE -48 2704 -48 2640 FLAG -928 544 4_EA_pos FLAG 112 432 ramp FLAG 544 512 PWM_1 FLAG -912 336 2_comp FLAG -928 496 3_EA_neg FLAG 112 512 Verror FLAG 208 176 0 FLAG 816 64 0 FLAG 896 560 0 FLAG 896 720 0 FLAG 272 992 node_3p FLAG 272 928 Verror FLAG -656 816 0 FLAG 176 1136 0 FLAG 1408 -64 pre_A FLAG 1344 128 pre_B FLAG 1520 336 pre_C FLAG 1504 576 pre_D FLAG 1264 544 0 FLAG 320 -16 clock FLAG 768 560 0 FLAG 1024 512 Set FLAG 1024 640 reset FLAG 1056 640 0 FLAG 1200 512 Q_bar FLAG 1488 96 0 FLAG 1600 32 0 FLAG 1792 -48 A1V FLAG 1488 288 0 FLAG 1600 224 0 FLAG 1792 144 B1V FLAG 1536 496 0 FLAG 1648 432 0 FLAG 1792 352 C1V FLAG 1520 736 0 FLAG 1632 672 0 FLAG 1792 592 D1V FLAG -576 1792 0 FLAG -48 2704 0 FLAG -80 2144 pri_left FLAG 640 2256 pri_right FLAG -272 2080 0 FLAG 1968 80 0 FLAG 1968 288 0 FLAG 1968 528 0 FLAG 1968 736 0 FLAG 2128 -48 OUT_A FLAG 2128 160 OUT_B FLAG 2144 368 OUT_C FLAG 2144 592 OUT_D FLAG -160 1616 V_supply FLAG 1952 2528 0 FLAG 2160 2160 Vout FLAG -1440 288 Vout FLAG 336 1088 0 FLAG 336 832 5V FLAG 288 640 0 FLAG 288 384 5V FLAG -736 416 5V FLAG -1344 0 0 FLAG -1232 -176 5V FLAG 1920 960 0 FLAG 1920 1136 0 FLAG -1088 1072 0 FLAG -928 928 p6_softstart FLAG -544 1088 0 FLAG -672 1088 0 FLAG 1568 1984 C4_1 FLAG 1648 1984 C4_2 FLAG 1808 2112 L_out SYMBOL voltage -1088 624 M0 SYMATTR InstName V_ref SYMATTR Value 1V SYMBOL res -1296 480 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 10k SYMBOL cap -1040 320 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 22n SYMBOL res -1152 320 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL voltage -32 672 M0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -200 134 Left 2 SYMATTR Value PULSE(1.3 3.3 0 9.8u 100n 10n 10u) SYMATTR InstName V4 SYMBOL res -592 496 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 1R SYMBOL Digital\\srflop 1104 464 R0 SYMATTR InstName A1 SYMBOL Digital\\dflop 896 -112 R0 SYMATTR InstName A2 SYMBOL voltage 208 32 R0 WINDOW 3 -131 119 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value PULSE(0 5 0 10n 10n 500n 10u) SYMATTR InstName V1 SYMBOL Digital\\or 960 432 R0 SYMATTR InstName A3 SYMBOL Digital\\xor 1344 416 R0 SYMATTR InstName A4 SYMBOL Digital\\inv 880 544 R90 SYMATTR InstName A5 SYMBOL Digital\\or 960 592 R0 SYMATTR InstName A6 SYMBOL voltage 176 1008 R0 SYMATTR InstName V5 SYMATTR Value 1V SYMBOL bv 1488 -48 R0 WINDOW 3 -35 107 Left 2 SYMATTR Value V=delay(V(pre_A), 500ns) SYMATTR InstName B4 SYMBOL Digital\\and 1664 -96 R0 SYMATTR InstName A7 SYMBOL bv 1488 144 R0 WINDOW 3 -35 107 Left 2 SYMATTR Value V=delay(V(pre_B), 500ns) SYMATTR InstName B5 SYMBOL Digital\\and 1664 96 R0 SYMATTR InstName A8 SYMBOL bv 1536 352 R0 WINDOW 3 -35 107 Left 2 SYMATTR Value V=delay(V(pre_C), 500ns) SYMATTR InstName B6 SYMBOL Digital\\and 1712 304 R0 SYMATTR InstName A9 SYMBOL bv 1520 592 R0 WINDOW 3 -35 107 Left 2 SYMATTR Value V=delay(V(pre_D), 500ns) SYMATTR InstName B7 SYMBOL Digital\\and 1696 544 R0 SYMATTR InstName A10 SYMBOL sw -128 2016 M180 WINDOW 3 -8 118 Left 2 SYMATTR Value Sw_kw1 SYMATTR InstName S1 SYMBOL sw -128 2576 M180 WINDOW 3 -22 120 Left 2 SYMATTR Value Sw_kw1 SYMATTR InstName S2 SYMBOL sw 720 2048 M180 WINDOW 3 -20 113 Left 2 SYMATTR Value Sw_kw1 SYMATTR InstName S3 SYMBOL sw 720 2560 M180 WINDOW 3 -19 115 Left 2 SYMATTR Value Sw_kw1 SYMATTR InstName S4 SYMBOL bv -368 1920 R0 SYMATTR InstName B8 SYMATTR Value V=V(OUT_A) SYMBOL bv -352 2480 R0 SYMATTR InstName B9 SYMATTR Value V=V(OUT_B) SYMBOL bv 480 1920 R0 SYMATTR InstName B10 SYMATTR Value V=V(OUT_C) SYMBOL bv 464 2464 R0 SYMATTR InstName B11 SYMATTR Value V=V(OUT_D) SYMBOL res -208 1888 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 2R2 SYMBOL res -192 2432 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 2R2 SYMBOL res 656 1888 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 2R2 SYMBOL res 640 2432 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R10 SYMATTR Value 2R2 SYMBOL voltage -576 1632 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -210 104 Left 2 SYMATTR Value PULSE(0 49 1u 10u 1 10 20) SYMATTR InstName V6 SYMBOL res -368 1600 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R11 SYMATTR Value 1m SYMBOL res -144 1776 R0 SYMATTR InstName RS1 SYMATTR Value 1m SYMBOL res 704 1824 R0 SYMATTR InstName RS3 SYMATTR Value 1m SYMBOL res -144 2336 R0 SYMATTR InstName RS2 SYMATTR Value 1m SYMBOL res 704 2336 R0 SYMATTR InstName RS4 SYMATTR Value 1m SYMBOL res 288 2176 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName Rpri_sense SYMATTR Value 1m SYMBOL bv 1968 -48 R0 SYMATTR InstName B12 SYMATTR Value V=10*V(A1V) SYMBOL bv 1968 160 R0 SYMATTR InstName B13 SYMATTR Value V=10*V(B1V) SYMBOL bv 1968 400 R0 SYMATTR InstName B14 SYMATTR Value V=10*V(C1V) SYMBOL bv 1968 608 R0 SYMATTR InstName B15 SYMATTR Value V=10*V(D1V) SYMBOL ind 1248 2240 R0 SYMATTR InstName L1 SYMATTR Value 10m SYMATTR Type ind SYMBOL ind 1392 2176 R0 SYMATTR InstName L2 SYMATTR Value 2.5m SYMATTR Type ind SYMATTR SpiceLine Rser=1m SYMBOL ind 1392 2304 R0 SYMATTR InstName L3 SYMATTR Value 2.5m SYMATTR Type ind SYMATTR SpiceLine Rser=1m SYMBOL ind 96 2176 M90 WINDOW 0 5 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName L_bridge SYMATTR Value 10µ SYMATTR SpiceLine Rser=1m SYMBOL diode 1600 2144 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value RF2001NS2D SYMBOL diode 1616 2416 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value RF2001NS2D SYMBOL ind 1888 2144 M90 WINDOW 0 5 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName L_out SYMATTR Value 100µ SYMBOL cap 2016 2224 R0 SYMATTR InstName C5 SYMATTR Value 100µ SYMBOL res 2288 2192 R0 SYMATTR InstName R_load SYMATTR Value 1R SYMBOL res 1424 2144 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R13 SYMATTR Value 1m SYMBOL res 1424 2416 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 1m SYMBOL cap 192 2496 R0 SYMATTR InstName C6 SYMATTR Value 100p SYMBOL cap 1104 2528 R0 SYMATTR InstName C7 SYMATTR Value 100p SYMBOL res 192 2352 R0 SYMATTR InstName R15 SYMATTR Value 1R SYMBOL res 1104 2384 R0 SYMATTR InstName R16 SYMATTR Value 1R SYMBOL res -1424 336 R0 SYMATTR InstName R17 SYMATTR Value 14k SYMBOL res -1424 528 R0 SYMATTR InstName R18 SYMATTR Value 1k SYMBOL diode 32 2000 R180 WINDOW 0 24 64 Left 2 WINDOW 3 -35 0 Left 2 SYMATTR InstName D3 SYMATTR Value pwr_diode SYMBOL diode 912 2016 R180 WINDOW 0 24 64 Left 2 WINDOW 3 -55 -3 Left 2 SYMATTR InstName D4 SYMATTR Value pwr_diode SYMBOL diode 16 2512 R180 WINDOW 0 24 64 Left 2 WINDOW 3 -35 0 Left 2 SYMATTR InstName D5 SYMATTR Value pwr_diode SYMBOL diode 896 2512 R180 WINDOW 0 24 64 Left 2 WINDOW 3 -54 -7 Left 2 SYMATTR InstName D6 SYMATTR Value pwr_diode SYMBOL diode -416 912 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D8 SYMBOL OpAmps\\UniversalOpAmp2 -704 512 R0 WINDOW 123 -129 111 Left 2 SYMATTR InstName U1 SYMBOL Comparators\\LT1719 384 880 R0 SYMATTR InstName U2 SYMBOL Comparators\\LT1719 336 432 R0 SYMATTR InstName U3 SYMBOL voltage -1344 -144 R0 SYMATTR InstName V7 SYMATTR Value 5V SYMBOL cap 96 2448 R0 SYMATTR InstName C_bridge_1 SYMATTR Value 5n SYMBOL cap 992 2464 R0 SYMATTR InstName C_bridge_2 SYMATTR Value 5n SYMBOL cap 1648 2016 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 470p SYMBOL cap 1648 2528 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C8 SYMATTR Value 470p SYMBOL res 1664 2016 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 220R SYMBOL res 1648 2528 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 220R SYMBOL cap 2112 2384 R0 SYMATTR InstName C1 SYMATTR Value 330µ SYMBOL res 2112 2224 R0 SYMATTR InstName R7 SYMATTR Value 1R SYMBOL bv -544 960 R0 SYMATTR InstName B1 SYMATTR Value V=V(p6_softstart) SYMBOL cap -1104 960 R0 SYMATTR InstName C_softstart SYMATTR Value 10n SYMBOL current -672 1040 R180 WINDOW 0 24 80 Left 2 WINDOW 3 24 0 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value 9µA TEXT -1560 1704 Left 2 !.model pwr_diode D(Ron=1m Roff=1Meg Vfwd=.4) TEXT -816 440 Left 2 ;op amp 1 TEXT -88 632 Left 2 ;sawtooth\noscillator TEXT -112 -256 Left 4 ;control IC, UC2875 TEXT -1568 1640 Left 2 !.tran 0 5m 1u 10n TEXT -1584 1800 Left 2 !.model Sw_kw1 SW(Ron=.01 Roff=100Meg Vt=4 Vh=-1) TEXT 1256 2128 Left 2 !k1 L1 L2 L3 1 TEXT -48 -776 Left 5 ;put instructions in to vary the load\nat 5 ohms load there starts to be some hard switching.\nat 1 ohm load the duty cycle is going towards 100% so the output volltage will drop out at voltages above this. TEXT 40 1448 Left 2 ;The power FETs are left as ideal switches\nas complex circuits can have simulation issues.\nComponents L_bridge, C_bridge_1, C_bridge_2, and the 4 FETs are\nessential parts of the phase shifted H bridge.\nComponents R15, C6, R16, C7, are to make the simulation function,\nand they may or may not be present in the real circuit. TEXT 2112 864 Left 2 ;p12 pwr gnd TEXT 2120 1048 Left 2 ;p20 gnd TEXT 248 352 Left 2 ;comparator TEXT 272 792 Left 2 ;comparator TEXT -448 -192 Left 4 ;some of the UC2875 functions are not simulated here. TEXT 2456 -904 Left 4 ;for the control loop calcs see the bode plot simulation\nalso want to increase L and C to slow the edges.\nthen want to do some ffts compared with othefr circuits. TEXT 2472 -176 Left 4 ;As with many complex circuits it is neccessary \nto change some simulator settings.\nin the top toolbar click on ..Simulate/setting\nthen in the window that opens set...\ngmin=1e-9, abstol=1e-9, reltol=0.005\nclick on okay\nthen click on run.\nthen click on the "Verror" and "ramp" and "PWM" nets.\nclick on the plot window,then on plot settings/add plot pane.\nthen click on "out_A" and "out_B"\nclick on the plot window,then on plot settings/add plot pane.\nthen click on "out_C" and "out_D"\nclick on the plot window,then on plot settings/add plot pane.\n then click on "pri_left" and "pri_right"\nclick on the plot window,then on plot settings/add plot pane.\n then click on "Rpri_sense" TEXT 2584 -280 Left 5 ;Instructions TEXT 2496 680 Left 5 ;Description TEXT 2520 768 Left 4 ;the phase shifted half bridge is an SMPS which deliberately \nslows down the switching edges with components L_bridge, \nC_bridge_1, and C_bridge_2.\nthis energy is not wasted its stored in Ls and Cs.\none aim of this is efficiency, but we are more interested in EMC.\nthis type of SMPS can have some of the advatage a resonant power supply\nbut at a fixed frequency. TEXT -1464 1488 Left 2 !.ic V(p6_softstart)=0V TEXT 2560 1464 Left 6 ;detail TEXT 2536 1552 Left 2 ;hard switching and soft switching.\nHard switching is when you turn the switch on and the voltage and current rise quickly,\nthe design doesn't do anything deliberately to slow their rise and fall.\nthe disadvantage of this is that these switching edges cause both losses and electromagnetic emmissions.\nThis phase shifted H bridge power supply achieves soft switching within some limits.\nit does this by inserting capacitors and inductors to control the speed of rise and fall of voltage and current.\nIn the attached circuit these are called L_bridge, C_bridge_1 and C_bridge_2. \nthis "phase shifted H bridge" circuit topolgy achieves soft switching at a fixed frequency.\nits disadvantage is that below a minimum power level it starts to hard switch.\nit also has the same disadvantage that all soft switching converters have, that is a resonant inductor (L_bridge)\nas the resonant inductor current reverses every switching cycle it tends to be difficult to design and lossy.\nthe output inductor (L_out) current only has about 10% ripple and so is easier to design and less lossy.\n \nin this design with the load set to less than about 45W (R_load=5 ohms), the design starts to exhibit some hard switching.\nthat is the two C_bridge capacitors don't fully soft charge before the hard switching edge comes along to finish the charge.\n \noutput diode snubbers,\nthe purpose of these is to stop the diode voltage and current from ringing after the switching edges. \nthe capacitor value is the smallest one that performs this function satisfactorily, as there is a loss calculated as \nfreq x capacitance x voltage squared, associated with these snubbers. \nwith a given snubber capacitor value, the correct snubber resistor value is the samallest value of resistor \nthat does not allow the capacitor differential voltage to ring.\nif having found the smallest value of resistor there is still too much ringing, then you need a bigger snubber capacitor.\nbut remember that increasing the capacitor value increases the loss, \nyou may find that losses get too high and there is still too much ringing, in that case you may have the wrong diode, \nor too high a frequency, or if you are working with a real circuit the layout may be poor.\n \nthe softstart current source has wide tolerance.\nso by simulation get the minimum value of softstart capacitor that you need to avoid overshoot.\nthen choose a capacitor value greater than twice this value. TEXT -1952 -680 Left 6 ;return the softstart cap\nto 100n TEXT 1536 1824 Left 4 ;Output Rectifier\nand RC snubbers TEXT 1976 1832 Left 4 ;LC output\nfilter TEXT 1224 1816 Left 4 ;Power\ntransformer TEXT 1232 1912 Left 2 ;turns ratio is 2:1\ninductance ratio \nis 4:1, as\ninductance is \nproportional to\nturns squared TEXT -656 1496 Left 4 ;Input\npower\n49V. TEXT -128 1688 Left 3 ;Ideal switch\nFET model TEXT 736 1696 Left 3 ;Ideal switch\nFET model TEXT -120 2256 Left 3 ;Ideal switch\nFET model TEXT 744 2280 Left 3 ;Ideal switch\nFET model TEXT 2096 -200 Left 4 ;These signals\ndrive the 4\nH_bridge FETs TEXT 72 1392 Left 4 ;Phase shifted H bridge TEXT 0 -368 Left 5 ;Control circuit TEXT 120 1312 Left 5 ;Power circuit TEXT -1008 856 Left 4 ;softstart TEXT -1520 104 Left 4 ;Vout\npotential\ndivider TEXT -1032 184 Left 4 ;error amp and V_ref TEXT -960 -936 Left 6 ;have to check up on how the UC1875 does the PWM does it really calc 2 x pulse widths TEXT 2488 2440 Left 2 ;You may republish or reuse this circuit implementation and text providing this line and the following lines are included.\nThis circuit implementation designed by Keith Wallbanks. Originally released on analogsimulation.co.uk\nThis circuit is provided as is without warranty of any kind. This text is intended to implement the MIT licence. LINE Normal -816 400 -816 400 2 LINE Normal 144 368 144 368 2 LINE Normal 320 816 320 816 2 LINE Normal 272 368 272 368 2 RECTANGLE Normal 2048 1216 -880 -224 1 RECTANGLE Normal -192 2080 80 1744 2 RECTANGLE Normal 640 2096 976 1744 2 RECTANGLE Normal -192 2624 48 2288 2 RECTANGLE Normal 912 2608 640 2320 2 RECTANGLE Normal 2352 656 2080 -80 2 RECTANGLE Normal 1504 2480 1216 1904 1 RECTANGLE Normal 1872 2560 2224 1920 1 RECTANGLE Normal 1184 2768 -416 1424 1 RECTANGLE Normal 2400 1232 -1632 -336 1 RECTANGLE Normal 2416 2800 -864 1344 1 RECTANGLE Normal -384 1136 -1136 880 2 RECTANGLE Normal -1328 816 -1536 240 2 RECTANGLE Normal -464 816 -1296 240 2