PWM DC Power Controller
The described DC power supply controller employs a timer IC, specifically the 7555, to generate a PWM signal that controls the output voltage and current. The PWM signal is a technique used to adjust the average power delivered to the load by varying the width of the pulses in a fixed frequency signal. This approach allows for efficient control of the power supply without significant heat generation, making it suitable for various applications.
The circuit typically consists of several key components: the 7555 timer IC, resistors, capacitors, and possibly transistors or MOSFETs for power amplification. The values of the resistors and capacitors connected to the timer IC determine the frequency and duty cycle of the PWM signal. The duty cycle, defined as the ratio of the time the signal is high to the total time period, directly influences the output voltage. A higher duty cycle results in a higher average voltage delivered to the load, while a lower duty cycle decreases the voltage.
In practical applications, the PWM output from the timer IC may drive a power stage, such as a transistor or a MOSFET, which serves to switch the load on and off rapidly. This switching action allows for fine control over the power delivered to the load while minimizing energy loss. Additionally, feedback mechanisms may be incorporated into the design to stabilize the output voltage and current, enhancing the performance of the power supply controller.
Overall, this PWM-controlled DC power supply design is characterized by its simplicity, efficiency, and versatility, making it suitable for various electronic applications requiring stable and adjustable power sources.This DC power supply controller is controlled by pulse width modulation PWM, generated by the circuit around timer IC2 7555 according to the formula: Duty.. 🔗 External reference
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