DC-DC Converter Pulse Width Control for Switching Loss Reduction
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Solution Overview
Problem
Conventional DC-DC converters consume excessive power due to switching losses, as the switching frequency is not optimized based on load conditions, leading to inefficient energy usage.
Innovation Solution
A semiconductor device with a modulator, comparator, pulse width setting circuit, and driver that generates a pulse signal with a minimum pulse width based on output voltage, reducing switching frequency during light-load operations to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the DC-DC converter uses conventional PWM generation with continuous switching, then the output voltage control is achieved, but the power consumption increases due to switching losses
Solution Approach 1:
The patent applies periodic action by generating PWM signals only when needed (when the output voltage deviates from the target voltage) rather than continuous switching. The PWM generation is triggered periodically based on voltage comparison results, allowing the system to maintain control capability while reducing unnecessary switching operations and associated power losses.
Solution Approach 2:
The patent implements dynamics by making the PWM switching behavior adaptive to load conditions and voltage requirements. The switching frequency and duty cycle are dynamically adjusted based on the comparison between output voltage and target voltage, enabling the system to optimize power consumption while maintaining effective voltage control under varying operating conditions.
2Measurement precision
If the switching frequency is increased to improve response speed, then the output voltage control precision is improved, but the switching losses increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the PWM switching parameters (frequency and duty cycle) based on the voltage control requirements. When high precision is needed, the system increases switching frequency; when precision requirements are lower, it reduces frequency to minimize switching losses, thus optimizing the trade-off between control precision and energy efficiency.
Solution Approach 2:
The patent implements feedback by continuously monitoring the output voltage and comparing it with the target voltage. Based on this feedback, the system adjusts the PWM generation frequency and duty cycle accordingly, enabling precise voltage control while avoiding excessive switching operations that would increase energy losses.
3Speed
If the DC-DC converter operates at high switching frequency for fast response, then the transient response is improved, but the efficiency decreases due to increased power loss
Solution Approach 1:
The patent applies dynamics by making the switching frequency adaptive to the operating conditions. During transient states when fast response is needed, the system operates at higher switching frequency. During steady-state operations, it reduces the switching frequency to minimize power losses, thus dynamically optimizing the balance between response speed and efficiency.
Solution Approach 2:
The patent implements periodic action by triggering PWM generation only during necessary transient conditions rather than maintaining continuous high-frequency switching. This periodic activation of PWM based on voltage comparison results enables fast transient response when needed while reducing average power loss during stable operating conditions.
Data Source
AI summary
A semiconductor device includes a modulator, a comparator, a pulse width setting circuit, and a driver. The modulator modulates a reference voltage to generate a reference signal. The comparator generates a comparator signal based on a result of comparing the reference signal and a feedback of an output signal supplied to an output terminal. The pulse width setting circuit generates a pulse modulation signal based on the comparator signal, wherein pulses of the pulse modulation signal have a pulse width that is equal to or greater than a predetermined pulse width. The driver outputs a driving signal that is based on the pulse modulation signal to the output terminal through an inductor.