Supply Circuit Ripple Compensation via Impedance Detection
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Solution Overview
Problem
Prior art supply circuits face difficulties in detecting ripple voltage across a capacitor when the load introduces significant noise, due to complex circuitry and potential interference from resonant injection circuits.
Innovation Solution
A supply circuit design that includes an inductor, impedance, capacitor, and a current injector with a feedback loop and converter to detect ripple voltage via the impedance, allowing compensating current injection at a point different from the output, enabling detection even with noisy loads, using components like push-pull amplifiers or transformers, and filtering to manage DC voltage and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ripple voltage is detected across the capacitor in prior art circuits, then ripple compensation can be achieved, but the detection becomes difficult when the load introduces much noise across the capacitor
Solution Approach 1:
The patent introduces an impedance element (resistor or inductor) as an intermediary component between the inductor and capacitor. This intermediary provides an alternative detection point for ripple voltage that is not directly affected by load noise across the capacitor. The ripple voltage can be detected across the impedance element instead of across the noisy capacitor, thereby maintaining detection accuracy in noisy environments.
2Reliability
If complex circuitry with multiple integrators and multipliers is used to detect and compensate ripple voltage, then ripple compensation can be achieved, but the device complexity increases
Solution Approach 1:
The patent extracts the detection function from the complex prior art circuitry and relocates it to a simpler configuration using the impedance element. By detecting ripple voltage across the impedance rather than requiring complex signal processing through multiple integrators and multipliers, the solution maintains effective ripple compensation while significantly reducing device complexity.
3Reliability
If a resonant injection circuit is used for ripple compensation, then ripple compensation can be achieved, but interference with the load occurs
Solution Approach 1:
The impedance element serves as a mediator that enables ripple detection without requiring resonant injection circuits. By providing an alternative path for ripple voltage detection, the intermediary impedance element eliminates the need for resonant injection, thereby maintaining ripple compensation effectiveness while avoiding interference with the load.
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
Effectively detects and compensates for ripple voltage in output voltage across the capacitor even with noisy loads, improving detection sensitivity and reducing interference, while maintaining low complexity and minimizing power dissipation.
Implementation Method 1
a feedback loop for detecting a detection signal via the impedance and for supplying a control signal to the current injector
Implementation Method 2
comprising a converter for converting the detection signal into the control signal
Data Source
AI summary
A supply circuit (1) comprising an inductor (2) coupled to switching means (7) and comprising a capacitor (4) is provided with an impedance (3) located between the inductor (2) and the capacitor (4), with a current injector (5) and with a feedback loop comprising a converter (6) for controlling the current injector (5) for compensating a ripple in an output voltage across the capacitor (4). The impedance (3) allows injection of a compensating current at a location different from an output location. This increases a number of possible detections of ripples in the output voltage and allows a ripple in an output voltage to be detected even in case of loads introducing much noise across the capacitor (4). The converter (6) detects a detection signal via the impedance (3) by measuring a voltage across the impedance (3) or across a serial circuit comprising the impedance (3) and the capacitor (4). The impedance (3) comprises a resistor or a further inductor.