PWM Controller VDD Charging for No-Load Power Stability
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Solution Overview
Problem
Conventional power converters face challenges in efficiently providing power to pulse-width-modulation (PWM) controllers, particularly during dynamic and no-load conditions, leading to potential undervoltage protection and insufficient power supply.
Innovation Solution
A controller system for power converters that includes a voltage detector and charging controller to monitor and manage the voltage at the VDD pin, generating a detection signal when the voltage drops below a threshold, triggering a charging current to be generated and flowing through the capacitor to maintain adequate power supply to the PWM controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power converters use auxiliary winding to provide power to PWM controller during normal operation, then power supply is provided, but undervoltage protection occurs and power supply becomes insufficient during dynamic and no-load conditions
Solution Approach 1:
The patent implements a feedback mechanism where the voltage detector continuously monitors the VDD pin voltage and generates a detection signal when voltage drops below a threshold. This feedback loop enables the system to dynamically respond to voltage changes and activate the charging circuit only when necessary, ensuring reliable power supply while minimizing unnecessary power consumption during normal operation.
Solution Approach 2:
The patent enables the power converter system to self-regulate its power supply by using the voltage detector and charging controller to automatically monitor and replenish voltage levels. The system serves itself by detecting voltage drops and autonomously activating the charging current generator to maintain adequate power supply to the PWM controller without external intervention.
2Reliability
If voltage detector and charging controller are added to monitor and manage VDD pin voltage, then power supply stability is improved, but device complexity increases
Solution Approach 1:
The patent integrates the voltage detector, charging controller, and charging current generator into a unified power management system within the PWM controller. By merging these functions into a single integrated structure rather than separate discrete components, the system achieves improved power supply stability while minimizing the increase in device complexity through functional integration.
3Loss of energy
If charging current is dynamically generated based on voltage detection, then power efficiency is improved, but control complexity increases
Solution Approach 1:
The patent employs periodic voltage detection and charging current generation based on voltage thresholds. The voltage detector continuously monitors the VDD pin, and when voltage drops below a predetermined threshold, the charging controller activates the charging current generator. This periodic monitoring and conditional charging approach optimizes power efficiency by charging only when necessary, while the standardized threshold-based control mechanism keeps the control complexity manageable.
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
This solution ensures stable power supply to the PWM controller, preventing undervoltage protection and improving power efficiency by dynamically adjusting the charging current based on voltage levels during various load conditions.
Implementation Method 1
a capacitor (e.g., a VDD capacitor) of the power converter. During the startup process of the semiconductor chip, the high-voltage pin (e.g., an HV pin) charges an external capacitor (e.g., a VDD capacitor)
Implementation Method 2
As the output voltage of the power converter rises, an auxiliary winding of the power converter starts providing power to the semiconductor chip
Data Source
AI summary
Controller and method for a power converter. For example, the controller includes: a first terminal configured to receive a first voltage; a second terminal connected to a capacitor and biased to a second voltage; a voltage detector configured to receive the second voltage from the second terminal and generate a detection signal based at least in part on the second voltage; a charging controller configured to receive the detection signal and generate a first control signal based at least in part on the detection signal; and a charging current generator configured to receive the first voltage from the first terminal and receive the first control signal from the charging controller; wherein the voltage detector is further configured to: detect that the second voltage has decreased to a first predetermined threshold; and generate the detection signal indicating that the second voltage has decreased to the first predetermined threshold.