Intelligent Pulse Control Circuit for Light Load Efficiency
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Solution Overview
Problem
Conventional power supplies face inefficiencies in light load conditions due to significant power loss, which limits their ability to meet modern energy-saving standards such as those set by the 80 PLUS and ENERGY STAR programs, particularly at low loading levels where switching losses dominate.
Innovation Solution
An intelligent pulse control circuit that disables the power factor correction and pulse width modulation stages during light load conditions by comparing loading and feedback signals to reduce switching losses, utilizing a control unit, buffer unit, comparing unit, and switch unit to generate a turn-off signal and control the stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power factor correction stage and pulse width modulation stage operate continuously to maintain stable voltage output, then the reliability of voltage supply is improved, but the energy loss increases significantly under light load conditions
Solution Approach 1:
The patent implements dynamic operation modes for the power factor correction stage and pulse width modulation stage, switching between normal continuous operation and light-load operation based on real-time load detection. The control unit monitors load current and dynamically adjusts the operating state of these stages, enabling them to enter a light-load operation mode when load current falls below a threshold, thereby reducing switching frequency and energy loss while maintaining adequate voltage supply stability.
Solution Approach 2:
The patent changes operational parameters (switching frequency, duty cycle) of the power factor correction stage and pulse width modulation stage based on load conditions. Under light load, the control unit adjusts these parameters to reduce switching activity and power loss, while under heavy load, it restores normal parameters to ensure stable voltage output, thus resolving the contradiction between reliability and energy loss.
2Speed
If the switching frequency is increased to improve voltage regulation response, then the responsiveness of voltage control is improved, but the switching loss increases
Solution Approach 1:
The patent dynamically adjusts switching frequency based on load conditions. Under heavy load, high switching frequency maintains fast voltage regulation response. Under light load, the control unit reduces switching frequency to minimize switching loss, while still maintaining adequate voltage control responsiveness through optimized duty cycle adjustment.
Solution Approach 2:
The control unit changes switching frequency and duty cycle parameters adaptively. When load current indicates light load condition, the patent reduces switching frequency and optimizes duty cycle to lower switching loss while preserving essential voltage regulation capability, thus balancing responsiveness and energy efficiency.
3Adaptability or versatility
If the power factor correction stage and pulse width modulation stage remain active to ensure full power capability, then the adaptability to different load conditions is improved, but the power consumption increases under light load
Solution Approach 1:
The patent implements dynamic load assessment and operational mode switching. The control unit continuously monitors load current and dynamically transitions the power factor correction stage and pulse width modulation stage between normal operation and light-load operation. This dynamic adaptation maintains full power capability when needed while reducing power consumption during light load periods.
Solution Approach 2:
The patent changes operational parameters of the power factor correction and pulse width modulation stages based on detected load conditions. Under light load, parameters are adjusted to reduce power consumption while maintaining sufficient adaptability. Under heavy load, parameters are restored to ensure full power handling capability, thus resolving the contradiction between adaptability and power consumption.
Data Source
AI summary
The instant disclosure provides an intelligent pulse control circuit used for a power supply. The intelligent pulse control circuit comprises a control unit, a buffer unit, a comparing unit and a switch unit. The buffer receives a loading signal. The comparing unit is coupled to the buffer unit, receives the loading signal generated according to the current of the output loading, and compares the loading signal and the feedback signal to generate a control signal. The switch unit is controlled by the control signal of the comparing unit to provide a turn-off signal. When the output loading is light load, the switch unit controls the control unit to disable the PFC stage and the PWM stage according to the turn-off signal. Accordingly, the intelligent pulse control circuit can reduce the power consumption when the output loading is light load.