2 layers50 × 50 mm
2 layers50 × 50 mm
Bus power
waynegramlich/bus_powerPCB that provides power to bus modules
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 17
- Pads
- 47
- Tracks, vias
- 83, 0
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 11 Aug 2014
- Updated
- 16 Nov 2014
Overview
Bus power is an open-source printed circuit board by waynegramlich, from the waynegramlich/bus_power repository on GitHub. It is a 2-layer board of 50 × 50 mm with 18 parts on 17 nets, routed with 83 tracks and 0 vias.
It is built around the OSTTC020162, FQP47P06 and MF-R300. Its parts include 3 resistors, 2 transistors, 1 connector and 1 switch.
Main components
3
OSTTC020162
插件,P=5mm-30℃~+105℃ 1 10mm 14~22 15A 1x2P 2 2P 300V 5mm Blue M2.6 Through Hole Plugin,P=5mm Screw Terminal Blocks ROHSOn-Shore TechScrew Terminal Blocks
FQP47P06
TO-220F-3-55℃~+175℃ 1 P-Channel 1.3nF 110nC@10V 160W 26mΩ@10V 3.6nF 320pF 47A 4V 60V P-Channel ±25V TO-220F-3 MOSFETs ROHSonsemiMOSFETs
MF-R300
插件-40℃~+85℃ 10.8s 20mΩ 2W 30V 3A 40A 6A 80mΩ 插件 Resettable Fuses ROHSBournsResettable Fuses
README
README.mdbus_power
This printed circuit board provides the ability to connect up to two separate batteries to the bus -- one for powering logic and the other for powering motors. The board has polarity protection circuitry to deal with accidentally connecting the power up backwards. In addition there are polyfuses (which are kind of like circuit breakers) that protect against accidental shorts.
MOSFET Polarity Protection Video
There is a nifty YouTube video that explains how a P-channel MOSFET polarity protection circuit works.
Revision A
The revision A schematic can be found in the rev_a directory
in either bus_power.pdf or bus_power.svg. Some relevant
data sheets can be found in the docs folder.
The motor (i.e. battery) power can be connected to either N4 or N5 which can be used daisy chain to other power connecors. N3 is an Emergency Stop connector. If you do not have an emergency stop button this connector must have a wire that shorts between pins 1 and 2. The positive power is run through a P-channel MOSFET (Q1) for polarity protection. A MOSFET has a much lower voltage loss than silicon diodes or Schottky diodes. The power then goes through a 3 Ampere polyfuse (R2). If 3 Amperes is exceeded, the polyfuse will warm up and go into a high resistance state. Finally, the power goes through SW1, which is a double pole, single through switch to the bus connector N2.
The logic power goes through two daisy chain connectors (N6, N7), a P-channel polarity protection MOSFET (Q2), a 3 Ampere polyfuse (R3) and the switch (SW1) before providing logic power to the bus connector (N2).
If this board is at the end of the bus, the termination jumper (J1) can be connected between pins 1 and 2 to provide 120 Ohms of bus termination via R1.
Revision A Issues
-
Power switch does not control daisy chain power.
-
The bus connector should be centered.
-
Provide a power on/off LED.
Revision B Issues
-
There is request for a jumperable power LED.
-
Are terminal blocks oriented backwards?
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | OSTTC020162 | Bus_BeagleBone_Rev_A:5MM_TERMINAL_BLOCK_2_POS | N3, N4, N5, N6, N7 |
| 4 | 3MM_HOLE | Bus_BeagleBone_Rev_A:MountingHole_3mm | H1, H2, H3, H4 |
| 2 | FQP47P06 | Bus_BeagleBone_Rev_A:TO-220_FET-GDS_Horizontal_LargePads | Q1, Q2 |
| 2 | MF-R300 | Bus_Power_Rev_A:MF_R300 | R2, R3 |
| 1 | 120 1% | Bus_BeagleBone_Rev_A:Resistor_Horizontal__400 | R1 |
| 1 | BUS_MASTER_HEADER | Bus_BeagleBone_Rev_A:Pin_Header_Straight_2x05_Shrouded | N2 |
| 1 | F-426-0020 | Bus_Power_Rev_A:GF_426_0020 | SW1 |
| 1 | OSHW_LOGO | Bus_BeagleBone_Rev_A:OSHW_LOGO_400mil | G1 |
| 1 | TERMINATE_JUMPER | Bus_BeagleBone_Rev_A:Pin_Header_Straight_1x03 | J1 |
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Questions
How big is the Bus power PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bus power use?
18 parts, built around the OSTTC020162, FQP47P06 and MF-R300. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Bus power KiCad files?
From the waynegramlich/bus_power repository on GitHub, at the commit this page was made from: the board is rev_a/bus_power.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bus power design in my own project?
Its repository states no licence, so its author keeps all rights: ask waynegramlich before reusing the design.