Voltage Converter Ripple Elimination via Opposite-Phase Reference
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Solution Overview
Problem
Voltage converters generate ripple voltage on the output end, causing operational instability in connected circuits, which existing technologies have not effectively addressed.
Innovation Solution
A voltage converter design incorporating a voltage conversion circuit, pulse width modulation signal generating module, feedback controlling module, and reference voltage generating module, which includes a phase-locked loop, waveform generator, amplitude adjuster, and adder to generate a reference voltage with an AC component phase opposite to the input voltage, eliminating ripple voltage by counteracting its effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a voltage converter converts input voltage to output voltage, then voltage level conversion is achieved, but ripple voltage is generated on the output end causing operational instability
Solution Approach 1:
The patent applies preliminary anti-action by generating a reference voltage with an AC component that has a phase substantially opposite to the input voltage phase. This opposite-phase reference voltage is subtracted from the output voltage in advance to counteract the ripple voltage before it causes operational instability. The subtractor circuit performs this pre-compensation by: Vout_corrected = Vout - Vref, where Vref contains an AC component with phase opposite to the input voltage, thereby eliminating ripple effects on the output.
2Device complexity
If a simple voltage conversion circuit is used, then device complexity is reduced, but ripple voltage elimination capability is insufficient
Solution Approach 1:
The patent segments the voltage conversion system into distinct functional modules: a voltage conversion circuit for power conversion, a reference voltage generating module for creating the opposite-phase reference signal, and a subtractor circuit for ripple elimination. This segmentation allows each module to perform its specific function efficiently while maintaining overall system manageability and effectiveness in eliminating ripple voltage.
Solution Approach 2:
The patent introduces a reference voltage as an intermediary element that mediates between the input voltage and output voltage. This reference voltage, generated with an AC component having phase substantially opposite to the input voltage, acts as a mediator that when subtracted from the output voltage, cancels out the ripple components. The intermediary reference voltage enables ripple elimination without requiring complex modification of the core voltage conversion circuit.
Data Source
AI summary
A voltage converter includes a voltage conversion circuit, a pulse width modulation (PWM) signal generating module, a feedback controlling module, and a subtractor. The voltage conversion circuit is configured to convert an input voltage to an output voltage according to a PWM signal. The PWM signal generating module is configured to generate the PWM signal according to a control signal. The feedback controlling module is configured to generate the control signal according to a feedback signal. The subtractor is configured to subtract a first reference voltage by the output voltage, to generate the feedback signal. The phase of an AC component of the first reference voltage is substantially opposite to the phase of the input voltage.