Printed circuit board and dynamic brake circuit comprising same
In this printed circuit board, on which two first relays and a single second relay can be selectively mounted, two shared through-holes which are shared by the connection of the terminals of the first relays and the connection of the terminal of the second relay and two first relay-dedicated through-holes which are used only for the connection of the terminals of the first relays are disposed in a line along a prescribed direction.
1 . A printed board on which two first relays and one second relay can be selectively mounted, comprising
two common through-holes shared by connection of a terminal of the first relay and by connection of a terminal of the second relay and two first relay-exclusive through-holes used only for connection of a terminal of the first relay, being arranged in a row along a predetermined direction,
wherein the two common through-holes are arranged between the two first relay-exclusive through-holes along the predetermined direction.
2 . The printed board according to claim 1 , wherein the first relay is a 1C contact relay, and the second relay is a 2C contact relay.
3 . A printed board on which two first relays and one second relay can be selectively mounted, comprising:
two common through-holes for coil terminals shared by connection of a coil terminal of the first relay and by connection of a coil terminal of the second relay and two first relay-exclusive through-holes for coil terminals used only for connection of a coil terminal of the first relay, being arranged in a row along a predetermined direction;
two common through-holes for fixed terminals shared by connection of a fixed terminal of the first relay and by connection of a fixed terminal of the second relay and two first relay-exclusive through-holes for fixed terminals used only for connection of a fixed terminal of the first relay, being arranged in a row along the predetermined direction; and
two common through-holes for movable terminals shared by connection of a movable terminal of the first relay and by connection of a movable terminal of the second relay and two first relay-exclusive through-holes for movable terminals used only for connection of a movable terminal of the first relay, being arranged in a row along the predetermined direction.
4 . The printed board according to claim 3 , wherein
the two common through-holes for coil terminals are arranged between the two first relay-exclusive through-holes for coil terminals along the predetermined direction,
the two common through-holes for fixed terminals are arranged between the two first relay-exclusive through-holes for fixed terminals along the predetermined direction, and
the two common through-holes for movable terminals are arranged between the two first relay-exclusive through-holes for movable terminals along the predetermined direction.
5 . The printed board according to claim 3 , wherein the two first relays are mounted side by side along the predetermined direction via the two common through-holes for coil terminals, the two first relay-exclusive through-holes for coil terminals, the four common through-holes for fixed terminals, the four first relay-exclusive through-holes for fixed terminals, the two common through-holes for movable terminals, and the two first relay-exclusive through-holes for movable terminals.
6 . The printed board according to claim 3 , wherein the one second relay is mounted via the two common through-holes for coil terminals, the four common through-holes for fixed terminals, and the two common through-holes for movable terminals.
7 . The printed board according to claim 3 , wherein
an interval between the common through-hole for coil terminals and the first relay-exclusive through-hole for coil terminals adjacent to the common through-hole for coil terminals is equal to an interval between the two coil terminals of the first relay,
an interval between the common through-hole for fixed terminals and the first relay-exclusive through-hole for fixed terminals adjacent to the common through-hole for fixed terminals is equal to an interval between the two fixed terminals of the first relay,
an interval between the common through-hole for movable terminals and the first relay-exclusive through-hole for movable terminals adjacent to the common through-hole for movable terminals is equal to an interval between the two movable terminals of the first relay,
an interval between the two common through-holes for coil terminals is equal to an interval between the two coil terminals of the second relay,
an interval between the two common through-holes for fixed terminals is equal to an interval between the two fixed terminals of the second relay, and
an interval between the two common through-holes for movable terminals is equal to an interval between the two movable terminals of the second relay.
8 . The printed board according to claim 3 , wherein
a printed wiring pattern for fixed terminals that electrically connects between the common through-hole for fixed terminals and the first relay-exclusive through-hole for fixed terminals adjacent to the common through-hole for fixed terminals and a printed wiring pattern for movable terminals that electrically connects all of the two common through-holes for movable terminals and the two first relay-exclusive through-holes for movable terminals are provided according to wiring of a three-phase alternating current circuit in which the printed board is installed.
9 . The printed board according to claim 3 , wherein the first relay is a 1C contact relay, and the second relay is a 2C contact relay.
10 . A dynamic brake circuit comprising:
the printed board according to claim 3 ;
the two first relays or the one second relay mounted on the printed board; and
three dynamic brake resistors, wherein
two of the three dynamic brake resistors have one end connected to each of two phases of three-phase power lines linking between a motor and an inverter and another end connected to each of the two common through-holes for fixed terminals or each of the two first relay-exclusive through-holes for fixed terminals of the printed board, and
remaining one of the three dynamic brake resistors has one end connected to remaining one phase of the three-phase power lines and another end connected to the common through-hole for movable terminals or the first relay-exclusive through-hole for movable terminals of the printed board.
11 . The dynamic brake circuit according to claim 10 , wherein the first relay and the second relay are normally closed contact relays.