0 - 36V Programmable Laboratory Power Supply

The reason for the development of any amateur radio design is the emerging need for a particular device. So it is this time. For a long time now I have been in dire need of a regulated laboratory power source.

It is a work with very advanced features compared to the previously shared digital power supply projects. The circuit based on the programmable power supply STM32F100C8T6B has a detailed structure with a mixture of analog and digital, all source code, pcb, etc. including panel design. Sharing everything will be very useful for different projects. 

Digital power supply specifications

• Output voltage: 0 … 36 V (10 mV voltage adjustment step)
• Output current: 0 … 4 A
• Maximum output power: 100W
• 1 mA current setting
• Stabilization modes: voltage (CV), current (CC)
• Setting error and voltage measurement: 0.02% + 10mV
• Current assembly and measurement error: 0.02% + 1 mA
• Instability during network fluctuations: <0.05% instability when load current: <0.05% Noise and ripple, rms: <1 mV (CV), <0.5 mA (CC) recovery time when a jump of load current: <100 ms Temperature instability: <100 ppm/°C Long-term instability: <0.05%
• Interface type: USB (isolated FT232RL ADuM1201)
• Input: 220 V ± 10%, 50 Hz Power
• Consumption: <150 W
• Dimensions: 150 x 90 x 220 mm
• Weight : 1.5 Kg
• Programmable laboratory power supply is a stabilized power supply with adjustable output voltage and adjustable current limiting output. It can be used in laboratory work, as a source for power electronics during the circuit development process, or as part of various equipment tests.

Digital Power Supply

PC software exe prepared in C++. and there are source code files. Displaying voltage and current information via USB interface, calibration, protection, voltage and current adjustment with 10 programs, etc. operations can be done. For more details see FIgure below

Main characteristics

• output voltage: 0…36 V
  
• output current: 0...4 A
• maximum output power: 100 W
• voltage setting step: 10 mV
• current setting step: 1 mA
• stabilization modes: voltage (CV), current (CC)
• Installation and voltage measurement error: 0.02% + 10 mV
• installation and current measurement error: 0.02% + 1 mA
• instability due to network fluctuations: <0.05%
• instability when changing load current: <0.05%
• noise and ripple, rms: <1 mV (CV), <0.5 mA (CC)
• recovery time for load current surge: <100 µs
• temperature instability: <100 ppm/°C
• long term instability: <0.05%
• interface type: USB (isolated)
• power supply: mains 220 V ±10%, 50 Hz
• power consumption: <150W
• dimensions: 150 x 90 x 220 mm
• Automatic cooling fan

Laboratory power supply (power supply unit, PSU) PSL-3604 is a stabilized power supply with adjustable output voltage and adjustable output current limitation. The source is completely linear, which ensures low noise and ripple output voltage, as well as good dynamic characteristics. A distinctive feature is the almost complete absence of output capacitance, which guarantees the absence of parasitic current surges during complex load behavior. To reduce power dissipation, an output stage with multi-level power supply and a synchronous rectifier are used. The source has a high output voltage stabilization coefficient and high temperature stability, which allows it to be used for precision measurements. USB control allows the source to be integrated into automated measurement systems. 

The circuit is made up of seven boards, all listed in the following figures

Board 1 (Power)

Board 2 Power MOSFET

Board 3 (controller)

Full Device

Modification of the boards of the first version

The first version requires the modification of some points of the PCB as in the PDF attached here and STM32 ISSUE

Click here for the componets list

The new version is expected with PIC 24 from microchip and liquid crystal display (under completion). All components, the Circuits Diagram, and PCB, are available here on the website. For further information do not hesitate to contact us