Voltage Converting Circuit Dynamic Mode Switching for Ripple Reduction
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Solution Overview
Problem
Conventional voltage converting circuits in PFM mode suffer from significant output voltage ripples during heavy loading conditions, resulting in poor performance.
Innovation Solution
A dual mode voltage converting circuit that utilizes a modulation signal generator, comparator, and logic unit to generate a PWM signal and control signal, allowing the switching unit to alternate on and off, thereby adjusting the input current to regulate the output voltage effectively, even under heavy loads by switching between PFM and PWM modes based on load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the voltage converting circuit is operated in PFM mode, then the circuit can operate efficiently, but the output voltage generates great ripple during heavy loading conditions
Solution Approach 1:
The circuit dynamically switches between PFM and PWM modes based on load conditions. The modulation signal generator produces a variable clock signal that adapts the operating mode: PFM mode for light loads (energy efficient) and PWM mode for heavy loads (stable output voltage), resolving the contradiction between energy efficiency and output stability
Solution Approach 2:
The circuit changes the operating parameter (modulation mode) based on load conditions. The comparator detects when output voltage ripple exceeds a threshold and triggers mode switching, thereby changing the fundamental operating parameter to maintain stability under varying load conditions
2Device complexity
If the voltage converting circuit uses a constant clock signal, then the circuit operation is simple, but the output voltage exhibits significant ripple during heavy loading
Solution Approach 1:
The constant clock signal is replaced with a variable clock signal generated by the modulation signal generator. This variable clock adapts its characteristics based on load conditions, maintaining simple circuit operation while eliminating output voltage ripple during heavy loading through dynamic adjustment
3Stability of the object's composition
If the voltage converting circuit operates in PWM mode, then the output voltage stability is improved, but the energy efficiency decreases compared to PFM mode
Solution Approach 1:
The circuit dynamically selects between PWM and PFM modes based on real-time load conditions. PWM mode is activated when stability is needed (heavy loads), while PFM mode is used when energy efficiency is prioritized (light loads), optimizing both parameters across different operating conditions
Solution Approach 2:
The operating mode parameter is changed based on load conditions to balance stability and efficiency. The comparator monitors output voltage and triggers mode switching, changing the fundamental operating parameter to achieve optimal performance for current conditions
Data Source
AI summary
A voltage converting circuit for converting an input voltage into an output voltage is disclosed. The voltage converting circuit includes a modulation signal generator, a comparator and a logic unit. The modulation signal generator is configured for generating a pulse width modulation (PWM) signal responsive to a feedback signal corresponding to the output voltage and a load coupled thereto. The comparator is configured for comparing the feedback signal with a reference signal to output a comparing signal. The logic unit is configured for performing a logical conjunction of the PWM signal and the comparing signal to generate a control signal for adjusting an input current corresponding to the input voltage to regulate the output voltage. A method for converting an input voltage into an output voltage is also disclosed herein.