Power Converter Control Circuit Resonance Timing
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Solution Overview
Problem
Existing power converter control circuits fail to precisely determine the time point when the auxiliary voltage reaches a wave trough after resonance due to component parameter tolerances, leading to increased power consumption.
Innovation Solution
A control circuit comprising an auxiliary pin, first and second detection units, a delay time controller, and a gate control signal generator, which detects the onset of resonance and a predetermined voltage, calculates a delay time from the output time difference between these signals, and generates a gate control signal to turn on the power switch at the wave trough, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control circuit uses ideal values of circuit components to determine the turn-on time point, then the circuit design is simple, but the power consumption increases due to imprecise timing
Solution Approach 1:
The control circuit uses feedback from the auxiliary winding voltage to detect the actual resonance state and component tolerances, then adjusts the turn-on timing accordingly. The first detection unit monitors the auxiliary voltage waveform and provides feedback about the actual resonance characteristics, enabling the circuit to compensate for component variations and achieve precise timing despite using simple ideal-value-based design parameters.
Solution Approach 2:
The invention dynamically changes the turn-on timing parameter based on detected resonance characteristics. Instead of using a fixed time point calculated from ideal component values, the system measures the actual auxiliary voltage waveform and adjusts the delay time parameter to match the real resonance frequency and phase, thereby optimizing power consumption while maintaining design simplicity.
2Loss of energy
If the control circuit compensates for component tolerances to achieve precise timing, then the power consumption decreases, but the device complexity increases
Solution Approach 1:
The control circuit performs self-calibration by using its own auxiliary winding to detect resonance characteristics. The first detection unit monitors the auxiliary voltage generated during operation and automatically adjusts the turn-on timing based on the detected resonance frequency and phase. This self-service approach eliminates the need for external calibration equipment or complex pre-characterization procedures, achieving precise timing with minimal added complexity.
Solution Approach 2:
The auxiliary winding serves multiple functions: it generates the resonance waveform, provides the feedback signal for detection, and enables automatic timing adjustment. By making the auxiliary winding multi-functional, the invention achieves precise timing compensation without adding separate calibration circuits or components, thereby minimizing the increase in device complexity while reducing power consumption.
3Use of energy by moving object
If the power switch is turned on at the wave trough to reduce power consumption, then the energy efficiency improves, but the timing precision deteriorates due to component tolerances
Solution Approach 1:
The turn-on timing is made dynamic rather than fixed. The control circuit continuously monitors the auxiliary voltage waveform and adjusts the delay time parameter in real-time based on the detected resonance frequency and phase. This dynamic adjustment ensures that the power switch always turns on at the actual wave trough corresponding to the current operating conditions, maintaining high energy efficiency despite variations in component tolerances, load conditions, or temperature.
Solution Approach 2:
The control circuit performs preliminary detection of the resonance characteristics before triggering the power switch turn-on. The first detection unit monitors the auxiliary voltage waveform in advance to identify the exact phase and frequency of resonance, then uses this information to calculate the optimal delay time. This preliminary action ensures that the subsequent turn-on operation occurs at the precise wave trough, achieving both high energy efficiency and accurate timing.
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
The solution allows for precise timing of the power switch turn-on at the wave trough, even with component tolerances, resulting in reduced power consumption of the power converter.
Implementation Method 1
a primary winding PR, an auxiliary winding AUX, a power switch M
Implementation Method 2
the auxiliary voltage Vaux reaches a wave trough after beginning resonance
Data Source
AI summary
A control circuit includes an auxiliary pin for receiving an auxiliary voltage of an auxiliary winding of a power converter; a first detection unit for detecting a first time point when the auxiliary voltage begins resonance, and outputting a first detection signal according to the first time point; a second detection unit for detecting a second time point when the auxiliary voltage reaches a predetermined voltage, and outputting a second detection signal according to the second time point; a delay time controller for obtaining a delay time according to a output time difference between the first detection signal and the second detection signal, and outputting a driving signal with delay of the delay time when receiving the second detection signal; and a gate control signal generator for generating a gate control signal to a power switch of the power converter according to the driving signal of the delay time controller.