Analog Multi-Phase Circuit Control Without Fixed Clock Timing
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Solution Overview
Problem
Existing multi-phase converters face challenges in implementing effective nonlinear control, particularly in space applications, due to the limitations of conventional digital control circuits in extreme environments, and the complexity of generating out-of-phase phase control signals with indeterminate frequencies.
Innovation Solution
A multi-phase electrical circuit with a non-linear and analog phase control circuit that generates phase-shifted control signals without a fixed clock frequency, using a voltage regulation circuit, distribution circuit, and protection circuit to ensure stability and reliability in space environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional digital control circuits are used in multi-phase converters for space applications, then the control functionality is achieved, but the reliability and robustness are degraded due to sensitivity to environmental constraints
Solution Approach 1:
The patent replaces digital control circuits with an analog control circuit that uses continuous voltage signals and operational amplifiers to generate phase-shifted control signals. This substitution of digital electronics with analog circuitry eliminates the reliability issues associated with digital microcontrollers in space environments while maintaining the necessary control functionality through continuous analog signal processing.
Solution Approach 2:
The analog control circuit automatically generates the required phase-shifted control signals for multiple power branches without requiring external digital controllers or complex programming. The circuit self-regulates by using operational amplifiers and RC networks to inherently produce the necessary timing and phase relationships, making the system self-sufficient and more reliable in harsh environments.
2Productivity
If nonlinear control is applied to multi-phase converters to optimize performance, then energy efficiency and load management are improved, but the complexity of generating out-of-phase control signals with indeterminate frequencies increases
Solution Approach 1:
The patent employs periodic RC charging and discharging cycles in each power branch to generate naturally phase-shifted control signals. Each branch uses resistors and capacitors that charge and discharge at different rates, creating inherent time delays and phase shifts without requiring complex digital timing logic. This periodic action simplifies the generation of out-of-phase signals while maintaining nonlinear control capabilities.
Solution Approach 2:
The analog control circuit changes the timing parameters of control signals by adjusting RC time constants in each power branch. By varying the resistance and capacitance values, the circuit dynamically adjusts the phase shifts and frequencies of control signals to match load requirements, enabling flexible nonlinear control without fixed clock frequencies while keeping the circuit architecture simple.
3Ease of operation
If fixed clock frequency control is used, then generating phase-shifted control signals is simplified, but adaptability to varying load conditions and frequency changes is reduced
Solution Approach 1:
The patent implements dynamic control by allowing the operating frequency and phase shifts to vary automatically with load conditions. The RC networks in each power branch respond dynamically to changing voltage and current conditions, adjusting their charging and discharging rates accordingly. This dynamic behavior enables the control circuit to adapt to varying loads without requiring a fixed clock frequency, maintaining ease of operation through simple analog components.
Data Source
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AI summary
The invention relates to a multi-phase electrical circuit, for supplying a target load, comprising: - a power cell comprising N supply branches which converge towards the output node. - a control circuit comprising; ∘ a voltage regulation circuit configured to generate an alternating binary regulation signal from a combination of the output voltage with a noise voltage. ∘ a distribution circuit configured to generate for each supply branch, at least one dedicated activation signal from the regulation signal; the plurality of activation signals being phase-shifted with each other according to a phase shift which varies over time.