Speed Control
How PWM Works
How the Circuit Works?
Therefore, the motor speed is slow. On the other hand, when the wiper arm of VR1 is at the bottom position, C1 charges through R1 and discharges via VR1 The resulting pulse train has long positive and short negative pulse widths.
The Zener diodes D4 to D7 are 15V diodes, they serve to stabilize the base voltage of the Mosfet transistors, since they are very sensitive to gate voltages.
The Power Supply
The Schematic Circuit
The circuit diagram of the power amplifier is shown in Figure 2 below. It uses 8 output Mosfet power transistors, 4 transistors for the positive cycle and 4 transistors for the negative cycle.
Fig. 2 - Schematic Circuit 12-36V 60A PWM DC Motor Speed Controller Using LM555 |
Components List
- Semiconductors
- U1 .......................... LM555 Integrated Circuit
- U2 .......................... LM317HV High Voltage Regulator
- Q1 .......................... BD140 PNP Transistor
- Q2 .......................... BD139 NPN Transistor
- Q3, Q4, Q5, Q6 ..... RFP70N06 Mosfet Power Transistor
- D1, D2, D3 ............ 1N4007 Silicon Diode
- D4, D5, D6, D7 ..... 1N4744 15V Zener diode
- D8 .......................... 1N5408 3A Silicon Diode
- Resistor
- R1 ......................... 1KΩ (brown, black, red, gold)
- R2 ......................... 33Ω (orange, orange, black, gold)
- R3 ......................... 10KΩ (brown, black, orange, gold)
- R4, R5, R6, R7 ..... 10Ω (brown, black, black, gold)
- R8 ......................... 240Ω (red, yellow, brown, gold)
- R9 ......................... 1K5Ω (brown, green, red, gold)
- VR1 ...................... 250KΩ Variable resistor
- Capacitor
- C1 ......................... 100nF Ceramic Capacitor
- C2 ......................... 10nF Ceramic Capacitor
- Miscellaneous
- P1, P2 ................... 2-pin PCB soldering terminal blocks
- Others ................... Printed Circuit Board, heat sink, wires, etc.
- Semiconductors
- U1 .......................... LM555 Integrated Circuit
- U2 .......................... LM317HV High Voltage Regulator
- Q1 .......................... BD140 PNP Transistor
- Q2 .......................... BD139 NPN Transistor
- Q3, Q4, Q5, Q6 ..... RFP70N06 Mosfet Power Transistor
- D1, D2, D3 ............ 1N4007 Silicon Diode
- D4, D5, D6, D7 ..... 1N4744 15V Zener diode
- D8 .......................... 1N5408 3A Silicon Diode
- Resistor
- R1 ......................... 1KΩ (brown, black, red, gold)
- R2 ......................... 33Ω (orange, orange, black, gold)
- R3 ......................... 10KΩ (brown, black, orange, gold)
- R4, R5, R6, R7 ..... 10Ω (brown, black, black, gold)
- R8 ......................... 240Ω (red, yellow, brown, gold)
- R9 ......................... 1K5Ω (brown, green, red, gold)
- VR1 ...................... 250KΩ Variable resistor
- Capacitor
- C1 ......................... 100nF Ceramic Capacitor
- C2 ......................... 10nF Ceramic Capacitor
- Miscellaneous
- P1, P2 ................... 2-pin PCB soldering terminal blocks
- Others ................... Printed Circuit Board, heat sink, wires, etc.
Fig. 3 - PCB - 12-36V 60A PWM DC Motor Speed Controller Using LM555 |
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