DC-DC Converter PWM Signal Generator Voltage Stability
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Solution Overview
Problem
Existing DC-DC converters face challenges in efficiently switching output voltage supply between different power sources while maintaining low noise and high power delivery, leading to output voltage variations.
Innovation Solution
A DC-DC converter design incorporating a signal generator, driver, filter, and switch, which outputs a PWM signal with adjustable duty cycle based on input and output voltages, and includes control signals to manage power states, ensuring stable output voltage by extracting the DC component and synchronizing with the input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If switching power supply lines and power supply circuits are used to supply a common output voltage, then power delivery capability is improved, but output voltage variations occur during switching transitions
Solution Approach 1:
The patent applies preliminary action by pre-charging the output capacitor through a dedicated charging circuit before switching to the switching power supply mode. This ensures that the output capacitor is already charged to the required voltage level, eliminating voltage drops or variations that would occur during transient switching transitions. The charging circuit activates in advance to prepare the output capacitor, so when the main power supply switches over, the output voltage remains stable without variations.
2Use of energy by moving object
If multiple power supply circuits are switched to optimize power delivery, then power efficiency is improved, but noise increases during switching transitions
Solution Approach 1:
The patent uses an intermediary approach by introducing a dedicated output capacitor charging circuit that acts as a buffer between the power supply circuits and the load. This charging circuit handles the transient charging requirements separately from the main power delivery path, isolating the switching noise from the main power supply transitions. The charging circuit absorbs the transient current demands and voltage fluctuations, preventing noise from propagating to the output while allowing efficient power delivery through the main switching circuits.
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 design effectively suppresses output voltage variations, allowing seamless switching between power sources and optimizing power delivery based on load requirements, reducing power consumption and maintaining low noise.
Implementation Method 1
a filter configured to extract a DC component from the second PWM signal
Data Source
AI summary
According to one embodiment, a DC-DC converter includes a signal generator configured to output a first PWM signal having arbitrary amplitude and a duty cycle established based on an input voltage and an output voltage, a driver configured to output a second PWM signal being in phase with the first PWM signal and having amplitude of the input voltage based on the first PWM signal, a filter configured to extract a DC component from the second PWM signal, and a switch configured to supply an output of the filter to the signal generator in response to a first control signal.