Custom Dual-Mode Power Supply Design
Budget: ₹12,500 – ₹37,500 INR
1. Unless you have experience in power supply design, avoid bidding.
2. Do not use AI to generate fancy write-ups.
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Power supply to be designed.
Modes of operation:
a. Constant Current (CC): User sets the current and the power supply tries to maintain that current by adjusting the voltage.
b. Constant Voltage (CV): User sets the voltage and the power supply tries to maintain that current by adjusting the current.
Output Voltage range (CV mode): 1–300 V
Output Current range (CC mode): 1–500 mA
Timer: 1-999min
Output resolution Voltage: 1 V
Current: 1 mA
Programming resolution:
Voltage: 1 V
Current: 1 mA
Time: 1 min
Accuracy:
Voltage: 5%, ±2 V
Current: 5%, ±4 mA
Timer: 0.1% ±1 min
Line regulation: < 0.5%
Load regulation: < 1% at load change 10-90% of maximum load
Ripple: < 3%
Stability: < 1%/10 h
Mains: 100V-240VAC
Output protection: Fully protected against any overload conditions
Recovery after power failure: The program continues automatically
LCD display (can be graphical 128x64), 16 key alphanumeric keypad, buzzer.
Some 40/44 pin PIC18F (or dsPIC if suited better), preferably.
Maybe have two PCBs: 1st for the power circuit, 2nd for PIC/uC.
Another option: Have 2 different uCs. One handling the power circuit, the other for the user interface. Communicating via opto-coupled IIC/SPI/UART.
Safety features include:
No load / Open-circuit (constant current)
Over load / Short-circuit (constant voltage mode)
Over temperature
Ground leak detection
EEPROM save and recallable: 9 programs (each program stores mode, voltage/current value, timer). Keep saving the timer value when a program is running.
Restart from power off: When system is switched on, was a program running previously before mains supply voltage was shut, mid-timer? If yes, continue from the same timer value.
2. Do not use AI to generate fancy write-ups.
-----------------------------------------------------------------------------------------------
Power supply to be designed.
Modes of operation:
a. Constant Current (CC): User sets the current and the power supply tries to maintain that current by adjusting the voltage.
b. Constant Voltage (CV): User sets the voltage and the power supply tries to maintain that current by adjusting the current.
Output Voltage range (CV mode): 1–300 V
Output Current range (CC mode): 1–500 mA
Timer: 1-999min
Output resolution Voltage: 1 V
Current: 1 mA
Programming resolution:
Voltage: 1 V
Current: 1 mA
Time: 1 min
Accuracy:
Voltage: 5%, ±2 V
Current: 5%, ±4 mA
Timer: 0.1% ±1 min
Line regulation: < 0.5%
Load regulation: < 1% at load change 10-90% of maximum load
Ripple: < 3%
Stability: < 1%/10 h
Mains: 100V-240VAC
Output protection: Fully protected against any overload conditions
Recovery after power failure: The program continues automatically
LCD display (can be graphical 128x64), 16 key alphanumeric keypad, buzzer.
Some 40/44 pin PIC18F (or dsPIC if suited better), preferably.
Maybe have two PCBs: 1st for the power circuit, 2nd for PIC/uC.
Another option: Have 2 different uCs. One handling the power circuit, the other for the user interface. Communicating via opto-coupled IIC/SPI/UART.
Safety features include:
No load / Open-circuit (constant current)
Over load / Short-circuit (constant voltage mode)
Over temperature
Ground leak detection
EEPROM save and recallable: 9 programs (each program stores mode, voltage/current value, timer). Keep saving the timer value when a program is running.
Restart from power off: When system is switched on, was a program running previously before mains supply voltage was shut, mid-timer? If yes, continue from the same timer value.