PWM Power Source Feedback Control for Circuit Loss Reduction
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Solution Overview
Problem
Constant-voltage output PWM power systems face efficiency and stability issues due to increased current amplitude when load increases, leading to higher circuit losses and elevated component temperatures.
Innovation Solution
A power system with a PWM power source, voltage detection unit, current detection unit, and feedback signal generation unit that adjusts voltage and current amplitudes based on feedback signals to maintain constant output power, reducing current amplitude when excessive and increasing it when necessary to maintain efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the current amplitude of the PWM output is increased to meet higher load demands, then the power output capability is improved, but the circuit loss increases and component temperature rises, reducing system efficiency
Solution Approach 1:
The patent implements a feedback control mechanism where the feedback signal generation unit receives both voltage amplitude feedback from the voltage detection unit and current amplitude feedback from the current detection unit. Based on these dual feedback signals, the system dynamically adjusts the PWM duty cycle to optimize the balance between power output and circuit loss, preventing excessive current draw that would cause overheating and energy waste
Solution Approach 2:
The system dynamically adjusts the PWM output parameters (voltage amplitude and current amplitude) in real-time based on load conditions and feedback signals. Rather than operating at fixed parameters, the PWM power source adapts its output characteristics dynamically, increasing power delivery when needed while maintaining efficient operating points to minimize circuit loss and thermal conversion
2Power
If the current amplitude of the PWM output is increased to meet higher load demands, then the power output capability is improved, but the component temperature increases, reducing system reliability
Solution Approach 1:
The current detection unit continuously monitors the current amplitude and feeds this information back to the feedback signal generation unit. When current exceeds optimal levels that would cause excessive heating, the feedback mechanism triggers PWM duty cycle reduction, thereby limiting current amplitude and preventing component temperature from rising to dangerous levels while still maintaining adequate power output
Solution Approach 2:
The system changes the PWM output parameters (specifically the duty cycle) in response to feedback signals to control the balance between power delivery and thermal generation. By adjusting the duty cycle dynamically, the system can deliver required power while keeping current amplitude within safe thermal limits, thus preventing overheating of components
3Stability of the object's composition
If the voltage amplitude is kept constant while load increases, then the voltage stability is maintained, but the current amplitude increases significantly, reducing system efficiency
Solution Approach 1:
The system transitions from constant-voltage operation to dynamic voltage-current coordination. The PWM power source adjusts both voltage amplitude and current amplitude dynamically based on load conditions and feedback signals, allowing the system to maintain power delivery efficiency while adapting to varying load demands, thereby reducing unnecessary power consumption that would occur with fixed constant-voltage operation
4Power
If the current amplitude increases to supply higher power, then the power delivery capability is improved, but the loop stability between the power system and load deteriorates
Solution Approach 1:
The dual feedback mechanism (voltage feedback + current feedback) provides comprehensive system state information to the PWM power source. This enables the system to detect and respond to load variations and instability conditions in real-time, adjusting PWM parameters to maintain loop stability even when operating at high power delivery levels, thus preventing oscillations and instability that would occur with simple constant-voltage control
Data Source
AI summary
The present invention provides a power system and controlling method thereof. The power system includes: pulse width modulation (PWM) power source, voltage detection unit, current detection unit and feedback signal generation unit. PWM power source receives external DC input, performs PWM on received external DC input, and supplies PWM output obtained through PWM from the DC output terminal to a device expecting power supply. Voltage detection unit detects voltage amplitude of PWM output. Current detection unit detects current amplitude of PWM output. Feedback signal generation unit generates feedback signal and supplies generated feedback signal to PWM power source. PWM power source adjusts the voltage amplitude and current amplitude of the PWM output based on the received feedback signal.