Power Converter Voltage Cancellation for Input-Independent High Supply
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Solution Overview
Problem
Existing power converters in telecommunications systems rely on buck-boost circuitry to generate high negative supply voltages, where the magnitude of the high voltage is dependent on both the low negative supply voltage and input voltage, leading to increased component costs and stress due to higher voltage ratings.
Innovation Solution
A power converter system using a switching circuit, input voltage cancellation circuit, and boost circuit to generate low and high supply voltages, where the high supply voltage magnitude is a multiple of the low supply voltage magnitude, independent of the input voltage amplitude, by selectively providing input voltage to a switching node based on a modulated control signal and canceling out the input voltage to isolate the switching node's swing from input voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional buck-boost circuit topology is used to generate high negative supply voltage, then the high voltage magnitude becomes dependent on input voltage magnitude, but this increases component cost and stress due to higher voltage ratings required
Solution Approach 1:
The patent extracts the input voltage dependency from the high negative supply voltage generation by introducing a separate input voltage cancellation path. The cancellation circuit removes the input voltage component from the switching node, leaving only the low negative supply voltage to determine the high voltage magnitude, thereby isolating the output from input variations.
Solution Approach 2:
The patent introduces an intermediary input voltage cancellation circuit between the input voltage source and the switching node. This intermediary circuit actively counteracts the input voltage effect through a controlled voltage source that generates an equal and opposite voltage, mediating the relationship between input and output voltages.
2Adaptability or versatility
If input voltage magnitude increases in traditional power converter, then high negative supply voltage magnitude increases, but this requires higher voltage-rated components which are more expensive
Solution Approach 1:
The patent employs feedback through the input voltage cancellation circuit that continuously monitors and counteracts the input voltage effect on the switching node. This feedback mechanism ensures that variations in input voltage do not propagate to the output, maintaining stable high negative supply voltage regardless of input changes.
Solution Approach 2:
The patent changes the relationship parameters between input and output voltages by introducing the cancellation circuit. The output voltage magnitude is transformed from being a function of both input and low negative supply voltages to being solely a multiple of the low negative supply voltage, fundamentally altering the system's voltage relationship.
3Power
If higher negative supply voltage magnitude is generated, then the stress on system components increases, but this is a consequence of input voltage contribution
Solution Approach 1:
The patent converts the harmful effect of input voltage contribution into a benefit by using the input voltage cancellation circuit to actively remove it. The same input voltage that previously caused harmful stress is now utilized in a controlled manner to cancel itself out, transforming the problem into a solution.
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 reduces the dependency of high supply voltage on input voltage magnitude, minimizing the need for higher voltage-rated components, lowering costs, and reducing stress on system components while maintaining sufficient voltage levels for on-hook and off-hook operations.
Implementation Method 1
Power converters are known in the art to generate the low negative supply voltage and the high negative supply voltage from an input voltage utilizing pulse-width modulated switching circuitry
Implementation Method 2
an input voltage cancellation circuit coupled to the switching node, the input voltage cancellation circuit operable to cancel out the input voltage selectively provided to the switching node by the switching circuit
Implementation Method 3
a boost circuit coupled to the switching node and to the switching circuit, the boost circuit operable to generate a high supply voltage at a second output node of the power converter
Data Source
AI summary
A system and method for generating a low supply voltage and a high supply voltage from an input voltage, wherein the dependency of the high supply voltage magnitude on the magnitude of the input voltage is removed and the resulting high supply voltage magnitude is a multiple of the low supply voltage magnitude. The low supply voltage and the high voltage may be implemented in a power converter of a communication system comprising a plurality of subscriber line interface circuits (SLICs).