2 layers43.9 × 27.7 mm
2 layers38.1 × 24.1 mm
Half bridge
slightlynybbled/half-bridge-breadboardHalf-bridge circuit with driver included
- Size
- 38.1 × 24.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 11
- Pads
- 50
- Tracks, vias
- 52, 3
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 14 Jul 2016
- Updated
- 15 Jul 2016
Overview
Half bridge is an open-source printed circuit board by slightlynybbled, from the slightlynybbled/half-bridge-breadboard repository on GitHub. It is a 2-layer board of 38.1 × 24.1 mm with 19 parts on 11 nets, routed with 52 tracks and 3 vias.
Its parts include 4 capacitors, 4 resistors, 4 connectors, 2 transistors and 1 IC. It belongs with the interfaces and adapters boards of this library.
README
readme.mdPurpose
This is a KiCad project that documents a simple half-bridge circuit, complete with driver. The circuit includes room for two TO-220 MOSFETs, two snubber circuits. It has two logic-level inputs which will turn on the upper and lower MOSFETs.
Details of Operation
Power Supply
If 10V < VBATT < 20V, then the jumper at P2 may be connected so that the FAN7842MX is properly supplied.
If VBATT < 10V or VBATT > 20V, then the user must supply a voltage between 10V and 20V to the circuit using pin 1 of P1.
PWM Frequency
The circuit is intended to operate as a complete half-bridge using Pulse Width Modulation (PWM) on the high side AND the low side. When the upper MOSFET is being operated, it must be operated synchronously with the lower MOSFET in order to charge the bootstrap capacitor. The minimum recommended PWM frequency is 10kHz.
When only the lower MOSFET is being operated, then the upper MOSFET input may be held low while the lower MOSFET is operated at any frequency desired, including DC.
Specifications
The circuit is intended to operate at a maximum voltage of ~35V and 5A, but these are limitations of the components and not of the circuit board. The board - with the proper capacitors and MOSFETs - should be able to operate as high as 200V at a current of up to 20A.
Connections
Breadboard
If the breatboard power rails are between 10V and 20V and the expected current is under 1A, then P1, P2, and P3 can be populated on the underside of the board and simply plugged into the breadboard.
When the voltage is outside of the 10V to 20V range, then only pins 1, 2, and 3 of P2 should be populated and plugged into the breadboard. The 10V-20V should be supplied to the board through pin 1 of P1.
Screw Terminals
If P2 is not populated, then power may be supplied through the screw terminals on P4.
Why Do This?
I know that there are lots of these sorts of circuits available, but I am continually finding myself re-drawing this schematic for different circuits. By placing all of the components for the half-bridge on one circuit, I have a flexible and extendable starting point for a host of circuits. Applications include:
- DC-DC conversion
- DC motor drives
- BLDC motor drives
I had a look around and didn't see anything quite like it on Tindie nor a couple of other sites that I frequent. World, here ya go.
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1k | lib_pcb:SM_0603 | R1, R2 |
| 2 | 1uF 50V | lib_pcb:SM_0805 | C1, C4 |
| 2 | CONN_01X04 | lib_pcb:CON_1x4_0.1in | P2, P3 |
| 2 | CSNUB | Capacitors_ThroughHole:C_Disc_D6_P5 | C2, C3 |
| 2 | Q_NMOS_GDS | lib_pcb:TO-220-VERTICAL | Q1, Q2 |
| 2 | RSNUB | Resistors_ThroughHole:Resistor_Horizontal_RM10mm | R3, R4 |
| 2 | fiducial | lib_pcb:fiducial | FID1, FID1 |
| 1 | CONN_01X03 | lib_pcb:CONN_1x3_OSTTC032162 | P4 |
| 1 | CONN_01X05 | lib_pcb:CON_1x5_0.1in | P1 |
| 1 | D | lib_pcb:SOD-323 | D1 |
| 1 | LOGO | lib_pcb:for_embed_logo | G*** |
| 1 | MOSFET_DRIVER_FAN7842MX | SMD_Packages:SOIC-8-N | U1 |
Questions
How big is the Half bridge PCB?
It measures 38.1 × 24.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Half bridge use?
19 parts. 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 Half bridge KiCad files?
From the slightlynybbled/half-bridge-breadboard repository on GitHub, at the commit this page was made from: the board is half-bridge.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Half bridge design in my own project?
Its repository states no licence, so its author keeps all rights: ask slightlynybbled before reusing the design.
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