Digital Feedback Loop for Switching Converter Isolation
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Solution Overview
Problem
Conventional switched-mode voltage converters face performance limitations due to analog feedback circuits with low bandwidth, high power consumption, and parameter degradation over temperature, which restrict their efficiency and accuracy in modern power conversion systems.
Innovation Solution
The implementation of a digital feedback loop with voltage isolation, high bandwidth, and temperature stability, utilizing a flyback configuration with a transformer, current-mode pulse-width modulator, and compensated error amplifier to regulate output voltage efficiently and accurately, while reducing power consumption and standby power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analog feedback circuits are used in switched-mode voltage converters, then the implementation is simple, but the bandwidth is low and power consumption is high
Solution Approach 1:
The patent replaces analog feedback circuits with digital feedback circuits. The digital feedback circuit uses digital-to-analog converters, microprocessors, and digital signal processing to achieve high bandwidth and low power consumption while maintaining implementation feasibility through modular digital components
2Device complexity
If analog feedback circuits are used in switched-mode voltage converters, then the implementation is simple, but power consumption is high
Solution Approach 1:
The patent substitutes analog feedback circuits with digital feedback circuits that use microprocessors and digital signal processing. This substitution significantly reduces power consumption while maintaining feedback functionality through efficient digital algorithms and low-power digital components
3Device complexity
If analog feedback circuits are used in switched-mode voltage converters, then the circuit is simple, but parameter degradation occurs over temperature
Solution Approach 1:
The patent replaces analog feedback circuits with digital feedback circuits that use digital signal processing and microprocessors. Digital circuits exhibit superior temperature stability as their parameters are not significantly affected by temperature variations, eliminating the parameter degradation issue inherent in analog circuits
Solution Approach 2:
The patent employs digital signal processing techniques that allow dynamic adjustment and compensation of feedback parameters. The digital system can maintain stable operation across temperature ranges by using software-based parameter optimization and compensation algorithms
4Speed
If digital feedback loop with voltage isolation is implemented, then bandwidth increases and power consumption decreases, but device complexity increases
Solution Approach 1:
The patent introduces voltage isolation circuits as intermediary components between the primary and secondary sides of the transformer. These isolation circuits enable high-bandwidth digital feedback while maintaining galvanic isolation, managing the increased complexity through modular isolation architecture
Solution Approach 2:
The digital feedback circuit performs multiple functions including voltage regulation, bandwidth extension, power consumption reduction, and temperature compensation. By consolidating these functions into a single digital system, the patent manages complexity through functional integration
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 enables efficient, accurate, and stable power supplies with low power consumption and high temperature stability, facilitating efficient power conversion and communication with master processors to provide power signals on demand, thereby overcoming the limitations of conventional feedback control systems.
Implementation Method 1
A transformer 26 having a primary coil coupled to an input port 27 and a secondary coil coupled through a diode 28 to a capacitor 29
Data Source
AI summary
A switching converter system includes a feedback path with at least one comparator arranged to provide a digital error signal in response to a comparison of an output voltage to a reference voltage. A first isolation channel can be configured to isolatably transport a clock signal to digitally gate the error signal, and a second isolation channel can be configured to isolatably transport the error signal. A controller can be coupled to the first and second isolation channels and configured to control a duty cycle in response to the error signal. A transformer is preferably inserted into the first and second isolation channels to enhance isolation and the first and second isolation channels respectively can include first and second digital gates that each have an output port coupled to an input port of the other.