Active Feedback Control IC for AC/DC Converter Power Loss Reduction
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Solution Overview
Problem
Portable consumer electronic devices experience high power loss in light load or standby modes due to active feedback control integrated circuits, switches, and photo couplers, leading to reduced standby time and slower transient response, despite existing power-saving methods.
Innovation Solution
An active feedback control integrated circuit with a feedback pin, operation unit, control unit, and controlled-current generation unit that generates operation signals and current control signals to manage the feedback current, allowing the converter to enter a deep sleep mode, reducing power loss and extending switch signal intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the converter operates in close loop during standby mode, then feedback control is maintained, but power loss increases and transient response slows down
Solution Approach 1:
The patent implements dynamic switching between closed-loop and open-loop modes based on load conditions. The controller dynamically adjusts the feedback current to the compensation pin, enabling the system to transition from continuous closed-loop operation to a hybrid mode where feedback is reduced or eliminated during light-load/standby periods, thereby reducing power loss while maintaining reliability when needed
Solution Approach 2:
The patent changes the feedback current parameter dynamically. During light-load or standby modes, the feedback current flowing through the compensation pin is reduced or shut off, which decreases the operating current of the active feedback control integrated circuit and reduces power loss, while still maintaining the ability to provide feedback control when required
2Loss of energy
If feedback current is reduced to decrease power loss, then power consumption decreases, but the converter may enter audio frequency band causing noise
Solution Approach 1:
The patent uses feedback control to monitor the converter's operation and dynamically adjust the feedback current to the compensation pin. This feedback mechanism ensures that when feedback current is reduced to decrease power consumption, the controller can detect and prevent entry into the audio frequency band, thereby eliminating noise while maintaining power savings
Solution Approach 2:
The controller automatically monitors and adjusts the feedback current based on the converter's operating state without external intervention. The system self-regulates to prevent audio frequency noise by shutting off or adjusting feedback current appropriately, while also self-optimizing power consumption during light-load and standby modes
Data Source
AI summary
An active feedback control integrated circuit applied to an alternating current/direct current converter includes a feedback pin, an operation unit, a control unit, and a controlled-current generation unit. The feedback pin is used for receiving a feedback current of an output feedback unit of the alternating current/direct current converter. The operation unit is used for generating an operation signal according to the feedback current. The control unit is coupled to the operation unit for generating a current control signal. The controlled-current generation unit is coupled to the control unit for generating a controlled current to the feedback pin according to the current control signal.