Bi-directional Feedback Pin for Power Controllers
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Solution Overview
Problem
Power supply controllers require hardware components to invert feedback signals, increasing cost and design complexity when handling feedback signals directly or inversely related to output voltage.
Innovation Solution
A controller with bi-directional feedback circuitry using current mirrors and shunt regulators to generate internal feedback signals inversely proportional to external feedback signals, eliminating the need for external inverting components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hardware components are added to invert feedback signals, then the power supply controller can handle both directly and inversely related feedback signals, but the device complexity and cost increase
Solution Approach 1:
The feedback pin is designed to universally accept both directly related feedback signals (from non-isolated topologies) and inversely related feedback signals (from isolated topologies) without requiring different hardware configurations. The same pin and internal circuitry handle both signal types by interpreting the voltage level relationships differently, eliminating the need for separate inversion hardware components.
Solution Approach 2:
The controller internally determines whether the feedback signal is directly or inversely related by analyzing the voltage level relationships between the feedback pin, output voltage node, and ground. The controller automatically adjusts its interpretation and internal processing accordingly, without requiring external components or manual configuration to service different feedback signal types.
2Reliability
If external inverting components are used, then feedback signal inversion is achieved, but the standby power consumption increases
Solution Approach 1:
The controller performs the feedback signal inversion function internally using its existing power management circuitry, eliminating the need for external inverting components that would consume additional standby power. The same internal circuits that process normal feedback signals are used to handle inverted signals, ensuring accurate interpretation without adding extra power consumption in standby mode.
3Adaptability or versatility
If the feedback pin voltage is allowed to float, then the controller can accommodate isolated topology feedback signals, but the voltage level stability decreases
Solution Approach 1:
The feedback pin voltage configuration is made dynamic rather than fixed. The pin can operate in different voltage reference modes depending on the detected feedback signal type. When an isolated topology feedback signal is detected, the pin naturally floats relative to ground and references the output voltage node. When a non-isolated feedback signal is detected, the pin references ground. This dynamic adaptation maintains voltage stability for each specific topology type.
Solution Approach 2:
The controller continuously monitors the voltage levels at the feedback pin and compares them against expected ranges for different topology types. Based on this feedback, the controller automatically adjusts its internal interpretation and processing mode, ensuring stable operation regardless of whether the feedback pin is grounded or floating, and correctly identifying the appropriate feedback signal relationship.
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
Enables efficient and cost-effective operation of power conversion circuits by properly interpreting feedback signals without additional hardware, reducing complexity and standby power consumption across various SMPS topologies.
Implementation Method 1
A controller with bi-directional feedback circuitry using current mirrors and shunt regulators to generate internal feedback signals inversely proportional to external feedback signals
Implementation Method 2
A controller with bi-directional feedback circuitry using current mirrors and shunt regulators to generate internal feedback signals inversely proportional to external feedback signals
Data Source
AI summary
A controller for a power conversion circuit has a first current-reading circuit coupled for receiving a first feedback signal at a first circuit node and generating an internal feedback signal at a second circuit node inversely proportional to the first feedback signal. A second current-reading circuit is coupled for receiving a second feedback signal at the first circuit node and generating the internal feedback signal at the second circuit node inversely proportional to the second feedback signal. The first current-reading circuit generates the internal feedback signal inversely proportional to an electric current injected into the controller at the first circuit node. The second current-reading circuit generates the internal feedback signal inversely proportional to an electric current drawn from the controller at the first circuit node.