Deep Burst Mode Control Circuit for Power Converter
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Solution Overview
Problem
Conventional power converters in light-load conditions experience inefficiencies in reducing power consumption due to high switching losses caused by frequent switching of the power transformer during burst mode operations.
Innovation Solution
A control circuit with a deep burst mode is introduced, featuring a load detection circuit and a PWM circuit that generates a switching control signal to switch the switching signal only once during each deep burst period when the load condition is very light-load, thereby reducing switching loss and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional burst mode is used to reduce power consumption in light-load conditions, then power consumption is reduced, but switching loss increases due to frequent switching of the power transformer
Solution Approach 1:
The patent implements a deep burst mode where the power transformer is switched only once per deep burst period instead of continuously switching during conventional burst mode. This periodic action with extended periods significantly reduces switching frequency and associated losses while still maintaining light-load operation. The control circuit monitors feedback voltage and enters deep burst mode when load is detected to be very light, keeping the transformer off for extended periods and switching only once per deep burst period.
2Loss of energy
If the switching signal is continuously switched during burst mode to regulate output, then output regulation is maintained, but power consumption increases due to high switching frequency
Solution Approach 1:
The patent dynamically adjusts the switching behavior based on load conditions. The control circuit continuously monitors the feedback voltage to detect very light-load conditions and dynamically switches between conventional burst mode and deep burst mode. During deep burst mode, the switching signal transitions from continuous impulse switching to a single switch per deep burst period, dynamically adapting the system operation to minimize power consumption while maintaining adequate output regulation through the extended period operation.
Data Source
AI summary
A control circuit with deep burst mode for power converter according to the present invention comprises a load detection circuit and a PWM circuit. The load detection circuit generates a switching control signal in response to a feedback signal. The feedback signal is correlated to a load condition of the power converter. The PWM circuit generates a switching signal to regulate an output of the power converter in response to the switching control signal and the feedback signal. The control circuit performs a deep burst mode to switch the switching signal only one time during each deep burst period when the load condition of the power converter is a very light-load. Therefore, switching loss is reduced so that the power consumption of the power converter is also reduced.