Switch State Controller Sense Current Powering
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Solution Overview
Problem
Conventional switch state controllers in power control systems become inoperative during power loss conditions, such as standby mode or when the auxiliary power supply is insufficient, leading to inefficient operation of standby power supplies designed to handle a wide range of input voltages.
Innovation Solution
A power control system that utilizes sense currents from the switching power converter to generate an operating voltage and control switching operations, ensuring the switch state controller remains operational and maintains a constant output voltage, even during power loss conditions, by using a secondary auxiliary power supply that leverages the sense currents to provide power to the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch state controller operates from the auxiliary power supply during normal mode, then the controller can provide full control functionality, but the controller becomes inoperative during power loss conditions when auxiliary power is insufficient
Solution Approach 1:
The controller generates its own operating voltage by utilizing a portion of the sense current that is already flowing through the power converter circuitry. This self-service approach eliminates the need for a separate auxiliary power supply and ensures the controller remains operational during power loss conditions, as it draws power from the system it is controlling rather than from an external source that may fail.
2Adaptability or versatility
If the standby power supply is designed to handle a wide range of input voltages, then it can operate during power loss conditions, but its efficiency decreases due to the wide voltage range
Solution Approach 1:
The sense current serves multiple functions simultaneously: it provides feedback information about the power converter's operation and also serves as the power source for the controller. This multi-functionality eliminates the need for separate power supply circuits and allows the system to operate efficiently across different power conditions without requiring the standby supply to handle wide voltage ranges.
3Power
If a separate auxiliary power supply is used to power the controller, then the controller has sufficient power during normal operation, but additional circuitry is required that increases device complexity
Solution Approach 1:
The power supply function for the controller is merged with the existing sense current path in the power converter. Instead of adding a separate auxiliary power supply circuit, the design combines the sensing and power-providing functions into a single integrated approach, where the sense current directly powers the controller after being tapped from the existing circuitry.
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 allows the power control system to maintain an approximately constant output voltage during both standby and normal operational modes, enhancing the efficiency of the standby power supply and ensuring reliable operation by using sense currents to supplement power when auxiliary power is insufficient.
Implementation Method 1
each sense current being resistively derived from a voltage sense of the switching power converter
Data Source
AI summary
A power supply system and method includes a switch state controller that is operational to control a switching power converter during certain power loss conditions that cause conventional switch state controllers to have diminished or no functionality. In at least one embodiment, during certain power loss conditions, such as when an auxiliary power supply is in standby mode or when the switching power converter is not operating, a power supply for the switch state controller does not provide sufficient operating power to the switch state controller during certain power loss conditions. In at least one embodiment, during such power loss conditions power is generated for the switch state controller using sense input and/or sense output currents of the switching power converter to allow an integrated circuit (IC) switch state controller to generate a control signal to control a switch of the switching power converter.