Current-Compensated One-Shot Circuit for Ripple-Stable Power Conversion
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Solution Overview
Problem
Power converter modules face limitations in supporting high output voltages due to increased inductor ripple current, which restricts their performance and requires smaller inductors, leading to increased size and cost.
Innovation Solution
The implementation of a current compensation circuit and a one-shot circuit within power converter modules, where the one-shot circuit includes a comparator and a capacitor to control the on-time of the high-side switch based on a compensated current, thereby maintaining constant inductor ripple current across a wide range of output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output voltage is increased in power converter modules, then the output power capability is improved, but the inductor ripple current increases which limits further voltage increases
Solution Approach 1:
The patent implements a feedback mechanism where the inductor ripple current is sensed and fed back to the control circuit. The control circuit adjusts the switching duty cycle based on the ripple current magnitude, creating a closed-loop control system that actively regulates the ripple current to remain within acceptable limits while allowing the output voltage to be increased.
Solution Approach 2:
The patent dynamically changes operating parameters including switching frequency and duty cycle in response to detected ripple current levels. When ripple current approaches limiting thresholds, the system adjusts these parameters to reduce the ripple while maintaining the desired output voltage, enabling extended voltage operation ranges.
2Volume of moving object
If smaller inductors are used to support high output voltages, then the module size is reduced, but the inductor ripple current increases beyond acceptable levels
Solution Approach 1:
The control circuit continuously monitors the inductor ripple current and provides feedback adjustment to the switching parameters. This enables the use of smaller inductors by actively compensating for the increased ripple through dynamic duty cycle and frequency adjustments, maintaining acceptable ripple levels despite reduced inductor size.
Solution Approach 2:
The system employs dynamic adjustment of switching frequency and duty cycle rather than fixed parameters. This dynamic behavior allows the converter to adapt to the reduced inductance value, optimizing the switching waveform to minimize ripple current while maintaining the compact inductor design.
3Object-generated harmful factors
If larger inductors are used to maintain low ripple current at high voltages, then the ripple current is controlled, but the module size and cost increase
Solution Approach 1:
The feedback control mechanism eliminates the need for oversized inductors by actively regulating the ripple current through real-time adjustment of switching parameters. The inductor can be sized for optimal performance without ripple current constraints, while the control system handles the ripple management that would otherwise require larger magnetic components.
Solution Approach 2:
The patent replaces the mechanical/passive solution of using larger inductors with an active electronic control solution. Instead of relying on increased inductance value to suppress ripple, the system uses electronic feedback control to dynamically manage the ripple current, substituting active control circuitry for passive component scaling.
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
This solution allows power converter modules to support both high and low output voltages without altering the inductor ripple current, enabling the use of smaller inductors and reducing the module's size and cost while maintaining performance.
Implementation Method 1
a capacitor configured to provide a capacitor voltage based on the compensated current
Implementation Method 2
a comparator configured to provide a comparator signal based on the capacitor voltage and a reference voltage
Data Source
AI summary
A circuit includes a current compensation circuit having first and second compensation inputs, and a compensation output. The first compensation input is coupled to an input voltage terminal and the second compensation input is coupled to a switching terminal. The circuit further includes a one-shot circuit having a comparator having first and second comparator inputs, and a comparator output. The first comparator input is coupled to a voltage reference terminal and the second comparator input is coupled to the compensation output. The one-shot circuit further includes a switch coupled between the second comparator input and a ground terminal and a capacitor having first and second capacitor terminals, in which the first capacitor terminal is coupled to the second comparator input and the second capacitor terminal is coupled to the ground terminal.