created hbridge model (spice/hbridge.asc)

diff --git a/spice/hbridge.asc b/spice/hbridge.asc
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+Version 4
+SHEET 1 976 680
+WIRE 896 -16 480 -16
+WIRE 432 32 224 32
+WIRE 480 32 480 -16
+WIRE 480 32 432 32
+WIRE 512 32 480 32
+WIRE 688 32 592 32
+WIRE 896 32 896 -16
+WIRE 96 112 -272 112
+WIRE 176 112 96 112
+WIRE 224 128 224 112
+WIRE 224 176 224 128
+WIRE 288 176 224 176
+WIRE 432 176 432 128
+WIRE 432 176 368 176
+WIRE -32 192 -480 192
+WIRE 96 192 96 112
+WIRE 288 192 96 192
+WIRE 224 208 224 176
+WIRE 384 208 384 112
+WIRE 384 208 368 208
+WIRE 432 208 432 176
+WIRE -272 240 -272 112
+WIRE -480 288 -480 192
+WIRE -32 288 -32 192
+WIRE 160 288 -32 288
+WIRE 176 288 160 288
+WIRE 288 288 288 192
+WIRE 384 288 288 288
+WIRE 320 304 224 304
+WIRE 432 304 320 304
+WIRE 160 320 160 288
+WIRE 368 320 368 208
+WIRE 368 320 160 320
+WIRE 320 368 320 304
+WIRE 320 496 320 448
+FLAG 320 496 0
+FLAG 688 112 0
+FLAG -272 320 0
+FLAG 896 96 0
+FLAG -480 368 0
+SYMBOL nmos 176 32 R0
+SYMATTR InstName M1
+SYMATTR Value IPD220N06L3
+SYMBOL nmos 384 32 R0
+SYMATTR InstName M2
+SYMATTR Value IPD220N06L3
+SYMBOL nmos 384 208 R0
+SYMATTR InstName M3
+SYMATTR Value IPD220N06L3
+SYMBOL nmos 176 208 R0
+WINDOW 3 -26 129 Left 2
+SYMATTR InstName M4
+SYMATTR Value IPD220N06L3
+SYMBOL ind 272 192 R270
+WINDOW 0 32 56 VTop 2
+WINDOW 3 5 56 VBottom 2
+SYMATTR InstName L1
+SYMATTR Value 3m
+SYMATTR SpiceLine Ipk=2 Rser=2.25
+SYMBOL res 304 352 R0
+SYMATTR InstName R1
+SYMATTR Value .075
+SYMATTR SpiceLine pwr=2
+SYMBOL voltage 688 16 R0
+WINDOW 123 0 0 Left 2
+WINDOW 39 24 124 Left 2
+SYMATTR InstName V1
+SYMATTR Value 28
+SYMATTR SpiceLine Rser=.01
+SYMBOL voltage -272 224 R0
+WINDOW 123 0 0 Left 2
+WINDOW 39 0 0 Left 2
+SYMATTR InstName V2
+SYMATTR Value PULSE(0 5 0 10n 10n 15u 16u 1000)
+SYMBOL polcap 880 32 R0
+WINDOW 3 24 56 Left 2
+SYMATTR InstName C1
+SYMATTR Value 1µ
+SYMATTR Description Capacitor
+SYMATTR Type cap
+SYMATTR SpiceLine V=100 Irms=1.33 Rser=0.047 Lser=0
+SYMBOL voltage -480 272 R0
+WINDOW 123 0 0 Left 2
+WINDOW 39 0 0 Left 2
+SYMATTR InstName V3
+SYMATTR Value PULSE(0 5 15u 10n 10n 1u 16u 1000)
+SYMBOL ind 496 48 R270
+WINDOW 0 32 56 VTop 2
+WINDOW 3 5 56 VBottom 2
+SYMATTR InstName L2
+SYMATTR Value 10n
+TEXT -306 520 Left 2 !.tran 15m