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A system is described for controlling the flow of electrical power between two sources. The system includes a circuit coupled between a first source and a second source and a controller subsystem coupled to the circuit. The circuit is capable of transitioning, in a continuous manner, between a first

A system is described for controlling the flow of electrical power between two sources. The system includes a circuit coupled between a first source and a second source and a controller subsystem coupled to the circuit. The circuit is capable of transitioning, in a continuous manner, between a first direction wherein electrical power flows from the first source to the second source and a second direction wherein electrical power flows from the second source to the first source. The control subsystem generates control signals to selectively activate switching elements of the circuit to control the direction and the amount of electrical power flowing through the circuit between the first and second sources.

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A system is described for controlling the flow of electrical power between two sources. The system includes a circuit coupled between a first source and a second source and a controller subsystem coupled to the circuit. The circuit is capable of transitioning, in a continuous manner, between a first

A system is described for controlling the flow of electrical power between two sources. The system includes a circuit coupled between a first source and a second source and a controller subsystem coupled to the circuit. The circuit is capable of transitioning, in a continuous manner, between a first direction wherein electrical power flows from the first source to the second source and a second direction wherein electrical power flows from the second source to the first source. The control subsystem generates control signals to selectively activate switching elements of the circuit to control the direction and the amount of electrical power flowing through the circuit between the first and second sources. osphodiesterase 5 with the proviso that said inhibitor has a cyclooxygenase inhibition of less than about 25% at 100 μM and an IC50of no more than about 14 μM for said phosphodiesterases. ccurrence is independently a) --(C1-C6)alkyl, b) --(C2C6)alkenyl or c) --(C2-C6)alkynyl; R2is --OH; R3is a) --H, b) --(C1-C10)alkyl wherein 1 or 2 carbon atoms, other than the connecting carbon atom, may optionally be replaced with 1 or 2 heteroatoms independently selected from S, O and N and wherein each carbon atom is substituted with 0, 1 or 2 Ry,c) --(C2-C10)alkenyl substituted with 0, 1 or 2 Ry,d) --(C2-C10)alkynyl wherein 1 carbon atom, other than the connecting carbon atom, may optionally be replaced with 1 oxygen atom and wherein each carbon atom is substituted with 0, 1 or 2 Ry,e) --CH=C=C2,f) --CN, g) --(C3-C6)cycloalkyl, h) --Z-aryl, i) --Z-het, j) --C(O)O(C1C6)alkyl, k) --O(C1-C6)alkyl, l) --Z--S--R12,m) --Z--S(O)--R12,n) --Z--S(O)2--R12,o) --CF3p) --NR12O--(C1-C6)alkyl or q) --CH2ORy; provided that one of R2and R3is absent when there is a double bond between CR2R3(the 7 position) and the F moiety (the 8 position) of the C-ring; Ryfor each occurrence is independently a) --OH, b) -halo, c) --Z--CF3,d) --Z--CF(C1-C3alkyl)2,e) --CN, f) --NR12R13,g) --(C3-C6)cycloalkyl, h) --(C3-C6)cycloalkenyl, i) --(C0-C3)alkyl-aryl, j) -het or k) --N3; R4and R5for each occurrence are independently a) --H, b) --CN, --(C1-C6)alkyl substituted with 0 to 3 halo, d) --(C2-C6)alkenyl substituted with 0 to 3 halo, e) --(C2-C6)alkynyl substituted with 0 to 3 halo, f) --O--(C1-C6)alkyl substituted with 0 to 3 halo, g) --O--(C2-C6)alkenyl substituted with 0 to 3 halo, h) --O--(C2--C6)alkynyl substituted with 0 to 3 halo, i) halo, j) --OH, k) (C3-C6)cycloalkyl or l) (C3-C6)cycloalkenyl; or R4and R5are taken together to form =O; R6is a) --H, b) --CN, c) --(C1-C6)alkyl substituted with 0 to 3 halo, d) --(C2-C6)alkenyl substituted with 0 to 3 halo, e) --(C2-06)alkynyl substituted with 0 to 3 hal or f) --OH; R7and R16for each occurrence are independently a) --H, b) -halo, c) --CN, d) --(C1-C6)alkyl substituted with 0 to 3 halo, e) --(C2-C6)alkenyl substituted with 0 to 3 halo or f) --(C2-C6)alkynyl substituted with 0 to 3 halo; provided that R7is other than --CN or -halo when D is NR7; or R7and R16are taken together to form =O; R8,R9,R14and R15for each occurrence are independently a) --H b) -halo, c) (C1-C6)alkyl substituted with 0 to 3 halo, d) --(C2-C6)alkenyl substituted with 0 to 3 halo, e) --(C2-C6)alkynyl substituted with 0 to 3 halo, f) --CN, g) --(C3-C6)cycloalkyl, h) --(C3-C6)cycloalkenyl, i) --OH, j) --O--(C1-C6)alkyl, k) --O--(C1-C6)alkenyl, l) --O--(C1-C6)alkynyl, m) --NR12R13,n) --C(O)OR12or o) --C(O)NR12R13; or R8and R9are taken together on the C-ring to form =O; provided that when m is 2, only one set of R8and R9are taken together to form