This is a very powerful DC Motor speed controller for DC motors up to 330V DC and current up to 2A. Basically, the project is a high voltage PWM source with adjustable frequency and adjustable PWM duty cycle range 0 to 99%. The board has been designed considering many applications and the circuit can be used as a heater controller, DC Motor speed controller, LED dimmer, Lamp dimmer, and High voltage PWM driver. The circuit can handle load up to 600W (330V DC @ 2A). The operating input supply is 100V AC to 250V AC or 100V to 330V DC. It is important to provide the input supply as per the operating power supply of the load. Trimmer pot PR1 is provided to adjust the frequency, and P1 to adjust the PWM duty cycle.
Connector CN2 is used for AC or DC load voltage supply, F1 Fuse for protection, R1 NTC to control inrush-current, C2 and C6 for EMI noise, C7 and C8 DC Bus filter capacitor for load supply, R12 Current sense resistor for overcurrent protection feedback circuit (CSC), R3 Temperature monitor (NTC) divide resistor for temperature feedback output, C3, C4 logic supply filter capacitors, CN1, R2 pull up resistor for Fault (VFO), SG3525 PWM Generator, Q1 BC847 to inverse the PWM, D1 power LED, U1 5V regulator.
FBA42060 – INTELLIGENT POWER MODULE (IPM)
The project is built using the FBA42060 IPM chip. This IPM chip is made for power factor correction, and consists of an inbuilt bridge rectifier, diode for back-EMF protection for inductive loads, IGBT to drive the loads, and IGBT gate driver and on chip NTC temperature monitor.