Hysteretic Controller Synchronized by Synthesized Voltage
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Solution Overview
Problem
Conventional power control topologies, such as voltage-mode and hysteretic control, face limitations in loop bandwidth and switching frequency variability, making them unsuitable for applications requiring controlled and consistent switching frequencies.
Innovation Solution
A power controller that incorporates a hysteretic comparator synchronized with an input voltage using a synthesizing circuit, which generates a synthesized voltage to couple with the feedback output voltage, ensuring controlled switching frequency and fast transient response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If voltage-mode control topology is used, then the design is simple and noise immune, but the loop bandwidth is limited due to double pole in power stage
Solution Approach 1:
The patent extracts the error amplifier from the control loop, eliminating the double pole limitation. By using direct hysteretic comparison between feedback voltage and reference voltage, the system achieves fast response without the bandwidth-limiting error amplifier stage, while maintaining design simplicity through the use of basic comparator circuitry.
2Speed
If hysteretic control topology is used, then the transient response is fast and design is simple, but the switching frequency varies with operating conditions
Solution Approach 1:
The patent introduces a synthesized ripple voltage as feedback to the hysteretic comparator. This feedback mechanism forces the comparator to switch at specific points in the synthesized voltage cycle, thereby establishing a fixed switching frequency while preserving the fast transient response characteristics of hysteretic control.
Solution Approach 2:
The patent combines hysteretic control with synthesized ripple voltage control. By merging these two control mechanisms, the system achieves both the fast transient response of hysteretic control and the fixed switching frequency of ripple-based control, creating a hybrid control topology that leverages the advantages of both approaches.
3Device complexity
If hysteretic control is used, then no error amplifier or compensation components are needed, but switching frequency is not controlled
Solution Approach 1:
The patent introduces a synthesized ripple voltage as an intermediary signal that mediates between the simple hysteretic comparator and the requirement for fixed switching frequency. This intermediary signal provides the timing reference that controls switching frequency without requiring complex compensation networks or additional control components.
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
The solution provides a hysteretic controller with synchronized switching frequency, enabling fast transient response and stability without the need for error amplifiers or additional compensation components, suitable for applications requiring consistent switching frequencies.
Implementation Method 1
A synthesizing circuit is operable to generate a synthesized voltage and couple the synthesized voltage with the feedback output voltage before the feedback output voltage is compared with the reference voltage by the hysteretic comparator
Implementation Method 2
A hysteretic comparator is operable to compare a reference voltage to a feedback output voltage from the load
Data Source
AI summary
A power controller for an electrical load is disclosed. The power controller includes a power stage operable to selectively provide an output voltage to the load. An input voltage generator supplies an input voltage to the power stage. A hysteretic comparator is operable to compare a reference voltage to a feedback output voltage from the load, the feedback output voltage being at least a portion of the output voltage, and provide a hysteretic comparator output to the power stage which controls the output voltage. A synthesizing circuit is operable to generate a synthesized voltage and couple the synthesized voltage with the feedback output voltage before the feedback output voltage is compared with the reference voltage by the hysteretic comparator. Coupling of the synthesized voltage with the feedback output voltage synchronizes the hysteretic comparator output with the input voltage provided to the power stage.