Phase Regulation in Peak Current Mode Power Converters
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Solution Overview
Problem
Existing power converter circuits in computer systems face challenges in maintaining desired phase alignment and responding to transients due to shared input power supply and ground nodes, leading to instability and prolonged locking times in phase-locked loop systems.
Innovation Solution
A power converter circuit design that employs a phase-locked loop system with reduced loop gain, using a control circuit to generate falling and rising ramp signals based on voltage levels, allowing for precise control of charge and discharge cycles to improve phase alignment and transient response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase-locked loop system is used in existing power converter circuits with shared input power supply and ground nodes, then the circuits can operate, but instability occurs and locking time is prolonged
Solution Approach 1:
The patent segments the power supply and ground paths by providing dedicated input power supply nodes and ground nodes for each power converter circuit. This segmentation isolates each circuit's reference nodes, preventing noise coupling and instability that occurs in shared-node configurations, thereby improving stability without prolonging locking time.
Solution Approach 2:
The patent introduces separate dedicated power supply nodes and ground nodes as intermediary elements between the power converter circuits and the power management unit. These intermediary nodes act as isolated reference points that prevent direct noise coupling between circuits, resolving the instability issue while maintaining efficient phase-locked loop operation.
2Device complexity
If multiple power converter circuits share common power supply nodes, then device complexity is reduced, but phase alignment and transient response deteriorate
Solution Approach 1:
The patent applies segmentation by allocating dedicated input power supply nodes and ground nodes to each power converter circuit. This physical separation of reference nodes eliminates noise coupling between circuits, enabling precise phase alignment and improved transient response while maintaining a relatively simple overall device structure through systematic node allocation.
3Reliability
If dedicated input power supply nodes and ground nodes are provided for each power converter circuit, then stability and phase alignment improve, but device complexity increases
Solution Approach 1:
The patent implements universality by providing a standardized dedicated node configuration that can be systematically applied to multiple power converter circuits. Each circuit receives its own set of dedicated input power supply nodes and ground nodes following a uniform pattern, which improves stability through isolation while avoiding the complexity of custom designs for each circuit.
Solution Approach 2:
The patent enables dynamic operation by allowing each power converter circuit to independently control its charge and discharge cycles through separate ramp signal generation. The dedicated nodes provide stable reference points that support independent circuit operation, improving transient response and phase alignment while the modular nature keeps complexity manageable.
Data Source
AI summary
A power converter circuit that includes a switch node coupled to a regulated power supply node via an inductor may, during a discharge cycle, sink current from the regulated power supply node. A control circuit may generate the rising and falling ramp signals using voltage levels of an input power supply node and the regulated power supply node. The control circuit may also determine a duration of the discharge cycle using results of comparing respective voltage levels of the generated rising and falling ramp signals.