2 layers57.3 × 19 mm
2 layers91.4 × 71.1 mm
adjustable source for voltages between 0 and 1000V
- Size
- 91.4 × 71.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 18
- Pads
- 67
- Tracks, vias
- 136, 3
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 2 Apr 2021
- Updated
- 8 Dec 2024
Overview
Hbruecke is an open-source printed circuit board by Fersaar, from the Fersaar/adjustable_high_voltage_source repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 91.4 × 71.1 mm with 26 parts on 18 nets, routed with 136 tracks and 3 vias.
It is built around the FAN73912MX. Its parts include 9 connectors, 6 resistors, 3 capacitors, 2 transistors and 1 IC.
Main components
1README
README.mdadjustable_high_voltage_source
This project was developed as part of the contactless electrostatic grippers project. To control the individual gripper zones, it is essential to supply them with a variable voltage ranging from 0V to 1000V. The required current is minimal, as only the individual gripper electrodes need to be charged. In the final gripper design, this circuit will be positioned between the microcontroller and the gripper.
Requirements
- Variable output voltage between 0V and 1000V
- External supply of 1000V DC
- Linear voltage regulation
- Input: PWM signal with 3.3V and variable duty cycle
- Cut-off frequency of 1kHz
- As cost-effective and straightforward as possible
Design
The core of the design is a half-bridge circuit utilizing the "FAN73912mx" driver, which can withstand voltages up to 1200V. However, it is not isolated, so all ground potentials must be interconnected. The circuit design follows the reference layout provided by the driver, incorporating a bootstrap circuit to switch the MOSFETs. The output is filtered through an RC gate to eliminate the PWM signal and provide a stable DC voltage. The switching frequency is set at 20kHz. While the design may not be optimal, it effectively meets the application’s requirements.
PCB
The completed circuit board is designed to allow multiple units to be stacked vertically, with supply lines that can be easily looped through.
 |  |
| single half bridge | stacked half bridges |
The quiescent current at 1000V and 20kHz is approximately 3 mA. The minimum voltage resolution is determined by the PWM resolution; for instance, with a 12-bit signal, the resolution is about 0.244V.
The voltage can be controlled linearly as desired:
BOM
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 2.2 | Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder | R3, R4, R5 |
| 2 | 47 | Resistor_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R1, R2 |
| 2 | _ | Package_TO_SOT_THT:TO-247-3_Vertical | Q1, Q2 |
| 1 | 0.33u | Capacitor_THT:CP_Radial_Tantal_D4.5mm_P5.00mm | C1 |
| 1 | 1200V | Diode_SMD:D_SMB_Handsoldering | D1 |
| 1 | 150p | Capacitor_THT:C_Disc_D7.5mm_W5.0mm_P7.50mm | C3 |
| 1 | 240k | Resistor_SMD:R_2010_5025Metric_Pad1.52x2.65mm_HandSolder | R10 |
| 1 | 3u3 | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C2 |
| 1 | FAN73912MX | 0_SamacSys_Parts:SOIC127P1032X265-16N | IC1 |
| 1 | Input_HV | TerminalBlock:TerminalBlock_Altech_AK300-3_P5.00mm | J3 |
| 1 | Input_Logic | TerminalBlock:TerminalBlock_Altech_AK300-2_P5.00mm | J6 |
| 1 | Input_Signal | TerminalBlock:TerminalBlock_Altech_AK300-3_P5.00mm | J1 |
| 1 | Input_VCC | TerminalBlock:TerminalBlock_Altech_AK300-2_P5.00mm | J2 |
| 1 | Output_Elektrode | TerminalBlock:TerminalBlock_Altech_AK300-3_P5.00mm | J8 |
| 1 | Output_HV | TerminalBlock:TerminalBlock_Altech_AK300-3_P5.00mm | J5 |
| 1 | Output_Logic | TerminalBlock:TerminalBlock_Altech_AK300-2_P5.00mm | J7 |
| 1 | Output_Raw | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J9 |
| 1 | Output_VCC | TerminalBlock:TerminalBlock_Altech_AK300-2_P5.00mm | J4 |
Questions
How big is the Hbruecke PCB?
It measures 91.4 × 71.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hbruecke use?
26 parts, built around the FAN73912MX. 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 Hbruecke KiCad files?
From the Fersaar/adjustable_high_voltage_source repository on GitHub, at the commit this page was made from: the board is KiCad/hbruecke.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hbruecke design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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