Frequency-Hopping DC/DC Converter Control for Light Load Efficiency
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Solution Overview
Problem
Conventional DC/DC converting devices experience inefficiency and increased power loss due to prolonged on-times during light load conditions, leading to suboptimal energy conversion and increased power consumption.
Innovation Solution
A frequency-hopping control method that generates cyclical control signals with a fixed on-time and variable off-time, regulated by a hysteretic comparator and voltage-controlled current source, to optimize the operating cycle of the voltage converting circuit, ensuring efficient energy transfer and reduced power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the conventional feedback control circuit extends the on-time to ensure sufficient voltage conversion, then the output voltage stability is improved, but the power loss increases due to prolonged operation during light load conditions
Solution Approach 1:
The patent applies dynamics by making the on-time duration variable rather than fixed. The control circuit dynamically adjusts the on-time based on real-time feedback from the output voltage and current sensing circuits. During light load conditions, the on-time is automatically reduced to minimize power loss, while during heavy load conditions, the on-time is extended to maintain output voltage stability. This dynamic adjustment resolves the contradiction between maintaining stable output voltage and reducing power loss.
Solution Approach 2:
The patent changes the parameter of on-time duration from a fixed value to a variable parameter that adapts to different operating conditions. By using feedback control circuits to sense output voltage and current, the system modifies the on-time parameter in real-time. This parameter change allows the converter to operate efficiently across different load conditions, reducing power loss during light loads while maintaining voltage stability during heavy loads.
2Adaptability or versatility
If the on-time is extended to handle varying load conditions, then the adaptability is improved, but the conversion efficiency deteriorates due to suboptimal energy transfer during prolonged on-times
Solution Approach 1:
The system uses dynamic control to adjust the on-time based on real-time load conditions. The feedback control circuits continuously monitor output parameters and modify the switching duty cycle accordingly. This dynamic adaptation ensures optimal conversion efficiency across varying load conditions without sacrificing adaptability.
Solution Approach 2:
The patent implements feedback control by using sensing circuits to detect output voltage and current, then feeding this information back to the control circuit. The control circuit processes this feedback and adjusts the on-time to maintain optimal conversion efficiency. This closed-loop feedback mechanism enables the system to adapt to different load conditions while minimizing energy loss during the conversion process.
Data Source
AI summary
A frequency-hopping control method is performed by a frequency-hopping control module that generates a driving signal for driving a voltage converting circuit to generate an output voltage. The method includes, generating a control signal according to a regulating signal inversely proportional to the output voltage of the voltage converting circuit. The control signal is cyclical, and each cycle of which includes an off-time having a variable duration with an inverse relation to magnitude of the regulating signal, and an on-time having a substantially fixed duration. The driving signal is generated according to the control signal and a periodic pulse signal. Therefore, the output voltage can be stabilized, and the voltage converting circuit can perform voltage conversion with reduced power loss and improved voltage conversion efficiency.