Resonant Power Supply Controller for Fast Transient Response
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Solution Overview
Problem
Conventional switch-mode power supply controllers face challenges with large current stress, stability issues, and high costs due to overly complex hardware requirements, particularly in low-power applications, leading to slower dynamic responses and larger filtering components.
Innovation Solution
A hardware-efficient controller architecture using a one-bit controller with a programmable delay line, comparator, and low-pass filter, which simplifies implementation and reduces electromagnetic interference, achieving fast transient response and reduced filtering component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional PWM controllers implementing linear control laws are used, then the control implementation is simple, but the dynamic response is significantly slower and filtering components are significantly larger
Solution Approach 1:
The patent replaces conventional PWM linear control mechanisms with a resonant control mechanism that operates at the natural resonant frequency of the power stage. This substitution enables the system to achieve fast transient response comparable to time-optimal controllers while maintaining implementation simplicity through standard operational amplifiers and passive components.
Solution Approach 2:
The patent changes the control parameter from traditional voltage-mode PWM to resonant frequency-based control. By operating the control loop at the resonant frequency of the power stage, the system achieves improved dynamic response without requiring complex hardware, as the resonant operation naturally provides fast response characteristics.
2Speed
If time-optimal controllers are used, then the transient response is improved, but the hardware required is overly expensive for cost-sensitive systems
Solution Approach 1:
The patent creates a simplified copy of the time-optimal controller's functionality using standard operational amplifiers and passive components. Instead of implementing complex time-optimal control algorithms that require expensive specialized hardware, the patent replicates the fast transient response behavior through resonant control using readily available components.
Solution Approach 2:
The patent replaces expensive, complex time-optimal controller hardware with inexpensive standard operational amplifiers and passive components. This substitution achieves comparable transient response performance using cost-effective, easily obtainable components suitable for high-volume production.
3Ease of operation
If conventional hysteretic implementations are used, then the control implementation is simple, but large current stress and stability problems occur due to overly large energy inertia
Solution Approach 1:
The patent introduces dynamic operation by operating the control loop at the resonant frequency of the power stage. This dynamic resonant operation allows the system to maintain stability while responding quickly to transients, avoiding the large energy inertia and current stress problems of conventional hysteretic controllers. The system adapts its operation to match the natural dynamics of the power stage.
Data Source
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Figure 2A~2B
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AI summary
Exemplary embodiments are directed to a power controller. A method may include comparing a summation voltage comprising a sum of an amplified error voltage and a reference voltage with an estimated voltage to generate a comparator output signal. The method may also include generating a gate drive signal from the comparator output signal and filtering a signal coupled to a power stage to generate the estimated voltage.