Programmable Power Supply Control Circuit with MCU Feedback
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Solution Overview
Problem
Developing a cost-effective programmable power supply that achieves good performance with effective protections such as over-voltage and over-current protection is challenging due to the complexity of achieving a wide range of output voltage and current.
Innovation Solution
A control circuit comprising a reference generation circuit, feedback circuit, switching controller, and micro-controller is used to regulate output voltage and current, with opto-couplers for signal transfer and protection mechanisms like over-voltage protection, ensuring efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a programmable power supply provides a wide range of output voltage and current, then the versatility and adaptability are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The power supply system is designed with universal control capabilities that can handle multiple output configurations (voltage mode, current mode, dual-output mode) through a single integrated control architecture. The microcontroller unit (MCU) implements multiple control algorithms and the feedback circuit can operate in different modes, allowing one system to perform multiple functions across different operating conditions.
Solution Approach 2:
The control architecture employs a nested structure where the microcontroller unit (outer layer) manages high-level control decisions and parameters, while the inner layer contains dedicated feedback circuits and switching controllers that handle real-time regulation. This hierarchical nesting allows complex programmable functions to be implemented through layered control, reducing overall system complexity.
2Reliability
If protection mechanisms such as over-voltage and over-current protection are implemented, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The system employs multiple feedback circuits that continuously monitor output voltage and current parameters. These feedback mechanisms provide real-time information to the control system, enabling automatic detection and correction of over-voltage and over-current conditions. The feedback loops are integrated into the existing control architecture, allowing protection functions to be implemented without adding separate complex protection circuits.
Solution Approach 2:
The control system automatically detects protection conditions and executes correction actions without external intervention. The microcontroller monitors feedback signals and autonomously adjusts switching parameters or activates protection modes when abnormal conditions are detected, making the protection mechanism self-regulating and reducing the need for additional control complexity.
3Measurement precision
If precise control over output voltage and current is achieved, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
High-precision feedback circuits continuously measure output voltage and current, providing accurate real-time data to the control system. The feedback signals are processed by the microcontroller which implements precise control algorithms to maintain output parameters within tight tolerances. This feedback-driven approach achieves high measurement and control precision through software-based regulation rather than complex hardware circuits.
Solution Approach 2:
The system achieves precise control by dynamically adjusting multiple parameters including switching frequency, duty cycle, and reference voltage levels. The microcontroller modifies these parameters in real-time based on feedback measurements and desired output specifications, enabling precise voltage and current regulation through parameter optimization rather than fixed complex circuitry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a programmable power supply with robust protection mechanisms, achieving precise control over output voltage and current while maintaining cost-effectiveness.
Implementation Method 1
a first opto-coupler (50) coupled to transfer a feedback signal from the secondary side to the primary side
Data Source
AI summary
A control circuit for a programmable power supply is provided. It comprises a reference generation circuit generating a voltage-reference signal and a current-reference signal for regulating an output voltage and an output current of the power supply. A feedback circuit detects the output voltage and the output current for generating a feedback signal in accordance with the voltage-reference signal and the current-reference signal. A switching controller generates a switching signal coupled to switch a transformer for generating the output voltage and the output current in accordance with the feedback signal. A micro-controller controls the reference generation circuit. The micro-controller, the reference generation circuit, and the feedback circuit are equipped in the secondary side of the transformer. The switching controller is equipped in the primary side of the transformer. The control circuit can achieve good performance for the programmable power supply.