1. A communication card, comprising:
a card substrate;
a power interface adapted to receive power from a power source and distribute it to elements mounted on the card substrate;
a ground start detection circuit on the card substrate; and
an active current regulating circuit adapted to receive electrical power through the power interface, regulate a provided current responsive to the received electrical power and provide the regulated current to the ground start detection circuit.
2. A communication card according to claim 1, wherein the active current regulating circuit requires at least 10% of the size of the area of the substrate required by the ground start detection circuit.
3. A communication card according to claim 2, wherein the active current regulating circuit requires at least 20% of the size of the area of the substrate required by the ground start detection circuit.
4. A communication card according to claim 1, wherein the active current regulating circuit requires at least 1% of the area of the substrate utilized for electronic elements.
5. A communication card according to claim 1, wherein the active current regulating circuit comprises at least two transistors.
6. A communication card according to claim 1, wherein the active current regulating circuit provides a fixed current level with a variation error of less than 20%.
7. A communication card according to claim 1, wherein the active current regulating circuit provides a fixed current level with a variation error of less than 10%.
8. A communication card according to claim 1, wherein the elements of the card are adapted to operate with a voltage level of less than 25 volts.
9. A communication card according to claim 1, wherein the active current regulating circuit is adapted to receive electrical power with a voltage level of less than 20 volts.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A latch mechanism, comprising:
a rack, having a restricting structure; and
a linkage assembly, connected to an electronic device in the rack, wherein the linkage assembly includes:
a fixed frame, connected to the electronic device;
a sliding frame, movable along a first direction relative to the fixed frame;
a handle, connected to the sliding frame;
a trigger, movably disposed between the handle and the sliding frame; and
a latch member, connected to the fixed frame and the restricting structure to restrict the electronic device in the rack;
wherein when an external force is exerted on the trigger and the handle to move the sliding frame along the first direction relative the fixed frame, the trigger pushes the latch member to separate from the restricting structure along a second direction perpendicular to the first direction, such that the electronic device can be drawn out of the rack.
2. The latch mechanism as claimed in claim 1, wherein the linkage assembly further includes a locking member disposed on the sliding frame and engaged with the fixed frame to restrict the sliding frame moving relative to the fixed frame.
3. The latch mechanism as claimed in claim 2, wherein the trigger is movably connected to the sliding frame, and when the trigger moves along the first direction relative to the sliding frame, the trigger pushes the locking member to deform and separate from the fixed frame.
4. The latch mechanism as claimed in claim 3, wherein when the trigger moves along the first direction relative to the sliding frame, the trigger pushes the locking member to deform along a third direction, perpendicular to the first direction and the second direction.
5. The latch mechanism as claimed in claim 3, wherein the trigger includes a rod body, a first contact portion, and a second contact portion, wherein the rod body is extended along the first direction, and the first and second contact portions protrude from the rod body toward the second direction.
6. The latch mechanism as claimed in claim 5, wherein when the trigger moves along the first direction relative to the sliding frame, the first contact portion pushes the locking member to deform and separate from the fixed frame.
7. The latch mechanism as claimed in claim 5, wherein when the trigger moves along the first direction relative to the sliding frame and pushes the latch member, the second contact portion pushes the latch member to separate from the restricting structure along the second direction.
8. The latch mechanism as claimed in claim 1, wherein the latch member includes an inclined surface, and when the trigger pushes the latch member, the trigger pushes the inclined surface to separate the latch member from the restricting structure along the second direction.
9. The latch mechanism as claimed in claim 1, wherein the linkage assembly further includes a first spring connected to the sliding frame and the trigger.
10. The latch mechanism as claimed in claim 1, wherein the linkage assembly further includes a second spring connected to the fixed frame and the latch member.