Adaptive Leakage Compensation Circuit for Power Converters
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Solution Overview
Problem
In high power, ultra-low quiescent current applications, leakage current in power converters increases with ambient temperature, leading to voltage runaway and malfunction, as traditional compensation methods either draw worst-case leakage or mirror leakage directly, failing to adaptively address the difference between high-side and low-side leakage currents.
Innovation Solution
An adaptive compensation circuit that actively senses the leakage current difference between high-side and low-side transistors and only removes the excess leakage current from the output, ensuring efficient power conversion across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional compensation methods draw worst-case leakage current or mirror leakage directly, then leakage current compensation is provided, but power dissipation increases and efficiency decreases
Solution Approach 1:
The compensation circuit dynamically adjusts the compensation current based on the actual leakage current difference between high-side and low-side switches. Instead of using a fixed worst-case compensation value, the circuit continuously adapts the compensation amount to match the real-time leakage conditions, thereby reducing unnecessary power dissipation while maintaining reliable leakage compensation.
Solution Approach 2:
The circuit changes the compensation current parameter adaptively by sensing the actual leakage current difference and adjusting the compensation amount accordingly. This parameter adjustment allows the system to operate with minimal compensation current under normal conditions while providing full compensation when needed, optimizing the trade-off between reliability and energy loss.
2Loss of energy
If adaptive compensation circuit senses leakage current difference and removes only excess leakage, then power dissipation is reduced, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary sensing mechanism that measures the leakage current difference between high-side and low-side switches. This intermediary sensing element enables the compensation circuit to identify and remove only the excess leakage current without requiring complex control logic, thus reducing power dissipation while keeping the circuit implementation relatively simple.
3Reliability
If leakage current increases with ambient temperature, then voltage runaway occurs, but compensation circuit must adapt to temperature variations
Solution Approach 1:
The compensation circuit incorporates feedback mechanisms that continuously monitor the leakage current and adjust the compensation amount in response to temperature variations. This feedback loop ensures that the circuit maintains voltage stability across different temperature conditions by automatically adapting the compensation level to match the temperature-dependent leakage characteristics of the switches.
Data Source
AI summary
Apparatus and systems and articles of manufacture are disclosed to provide adaptive leakage compensation for powertrains. An example apparatus comprising a first current path including a first transistor and a second transistor; a second current path including a third transistor and a fourth transistor; and a current mirror including a fifth transistor and a sixth transistor, wherein a first ratio exists between the first transistor and the third transistor, a second ratio exists between the second transistor and the fourth transistor, and a third ratio exists between the fifth transistor and the sixth transistor, the third ratio greater than or equal to the second ratio, the second ratio greater than or equal to the first ratio.