DC-DC Converter Pulse Skipping for Stable Load Transitions
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Solution Overview
Problem
Existing DC-to-DC converters face challenges in stabilizing voltage during mode switching, particularly in heavy-load-to-light-load transient situations, leading to inefficiencies and voltage ripple issues.
Innovation Solution
A DC-to-DC converter with adaptive pulse skip and on-time control functions, utilizing a first and second switching circuit controlled by complementary pulse signals, a pulse control signal generation circuit, and a pulse skip control circuit to adjust output voltage based on load current, minimizing overshoot and optimizing efficiency through variable on-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DC-to-DC converter control is used, then the converter can operate with simple control circuitry, but voltage instability and overshoot occur during heavy-load-to-light-load transient situations
Solution Approach 1:
The patent implements dynamic control by switching between different operating modes (continuous conduction mode and discontinuous conduction mode) based on real-time load conditions. The control circuit dynamically adjusts the switching behavior of the first and second switching circuits to maintain voltage stability during transient load changes, resolving the contradiction between simple control and voltage stability.
Solution Approach 2:
The patent employs feedback control mechanisms where the control circuit monitors the output voltage and load current, then adjusts the pulse control signals accordingly. This feedback loop enables the system to detect and correct voltage deviations during heavy-load-to-light-load transitions, achieving voltage stability without requiring overly complex control circuitry.
2Loss of energy
If fixed switching frequency is used, then the control circuit is simple, but switching losses increase and efficiency decreases under varying load conditions
Solution Approach 1:
The patent implements dynamic switching frequency adjustment by varying the on-time of the first switching circuit based on load current magnitude. During light-load conditions, the on-time is reduced or skipped entirely, minimizing switching losses. During heavy-load conditions, the on-time increases to maintain adequate power transfer. This dynamic adjustment resolves the contradiction between simple control and energy efficiency.
Solution Approach 2:
The patent changes the timing parameters of the switching circuits adaptively. The control circuit adjusts the duration of pulse control signals applied to the first and second switching circuits based on real-time load conditions, thereby optimizing the balance between switching losses and power transfer efficiency without requiring complex control architecture.
3Productivity
If continuous switching is used, then voltage regulation is maintained, but ripple voltage increases and efficiency decreases under light-load conditions
Solution Approach 1:
The patent implements periodic switching with variable duty cycles based on load conditions. During light-load conditions, the switching frequency is reduced or pulses are skipped entirely, decreasing ripple voltage and improving efficiency. During heavy-load conditions, continuous switching is maintained to ensure adequate voltage regulation. This periodic action with adaptive timing resolves the contradiction between efficiency and voltage regulation quality.
Solution Approach 2:
The patent applies partial switching action during light-load conditions by reducing the on-time of the first switching circuit or skipping pulses entirely. This partial action is sufficient to maintain minimum voltage regulation requirements while significantly reducing switching losses and ripple voltage. During heavy-load conditions, full switching action is applied to maintain proper voltage regulation, resolving the contradiction between efficiency and regulation quality.
Data Source
AI summary
Disclosed is a DC-to-DC converter which includes a first switching circuit connected between a power line receiving a DC voltage and an output terminal of the DC-to-DC converter and switched based on a first pulse control signal, a second switching circuit connected between the output terminal and a ground and switched based on a second pulse control signal, a pulse control signal generation circuit that receives a first level of a first voltage associated with an output voltage and a second level of a first reference voltage, wherein, in response to the second level being higher than the first level, the pulse control signal generation circuit is configured to generate the first pulse control signal to increase the output voltage and wherein, in response to the second level being lower than the first level, the pulse control signal generation circuit is configured to generate the second pulse control signal.