E-fuse beta1 manual

E-fuse is to provide a electronic power switch with overcurrent protection and anti-sparking function.

The physical fuse is simple and reliable, but reacts too slow. For example, out 120A fuse, when current is 240A, it will take 1 minute to blow, this is some times too late, usually unrecoverable, and lack of flexibility.

Feature

• 3oz Aluminum substrate power stage with stacked logic board.
• High side N-MOSFETS, 100V 300A x 3.
• Low side shunts for current sample, 0.5mΩ x 5.
• 15A, 30A, 60A, 120A, 180A, 240A, 300A configurable protecting current, beyond 120A is yet testing.
• 80V max battery voltage, with 20V MOSFETS margin, 100V can be achieved by change the MOSFETS.
• Anti-spark.
• Power switch, support momentary/latching button and ignite key, independent from MOSFETS control logic.
• Roll to power on, can be set off by a switch.
• Auto power off after 20 minutes, when ESC is idle, also can be set off by a switch.
• Less than 100uA shut off current.
• Size:

The button and ignite

E-Fuse support three types power on inputs: momentary button, latching button, and ignite key.

If ignite key turned to power on, E-fuse recognizes it as ignite key mode.

If no ignite key hasn't been turned on, E-fuse goes to check if the button is been pressed, if pressed then released within 1 second, E-fuse recognizes it as momentary button mode.

If button been pressed more than 2 seconds, E-fuse recognizes it as latching button mode.

Power off E-fuse with momentary button mode by press the button more than 2 seconds.

Power off E-fuse with latching button or ignite key mode by release the button or the ignite key.

When using ignite key mode, please set "Roll to power on" to off, to prevent unexpected power on, when you intend to keeping power off E-fuse.

The protecting current setting

With a momentary button, we can set the protecting current by click the button continuously then wait 1 second.

The button LED will then blink to indicate the setting.

The button LED also blinking after power on to indicate the previous setting.

Protecting current setting by button

Click times	Set protecting current	Blink times
3	15A	1
4	30A	2
5	60A	3
6	120A	4
7	180A	5
8	240A	6
9	300A	7

Shut off time vs detected current

Current rating	Shut off time
detected current < 1 x setting current	never
1 x setting current <= detected current < 2 x setting current	60 seconds
2 x setting current <= detected current < 3 x setting current	15 seconds
3 x setting current <= detected current	0.1 second

Roll to power on

When E-fuse at shut off state, if a rising voltage signal appeared on "out+" wire, and Roll to power function is enabled, E-fuse will automatically power on. This rising voltage must be more than 3.0V.

After power on, the presumed button type is momentary button, unless the ignite key or latching button is detected.

You can disable this roll power on function by set the "Roll on" switch to off state.

Auto power off

E-fuse monitors the current of the load, when the power consumed by load less than 20W continued more than 20 minutes, E-fuse will shut off automatically.

You can disable this Auto power off function by set the "Sleep" switch to off state.