Voltage Regulator Phase Switching for Light-Load Efficiency
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Solution Overview
Problem
Existing voltage regulators in computing devices are inefficient under light loads due to the use of homogeneous power stage circuits optimized for maximum current, leading to inferior power conversion efficiency and reduced battery life.
Innovation Solution
Implementing a voltage regulator with heterogeneous power stage circuits, where a first power stage circuit with lower maximum output current and higher power conversion efficiency supplies current under single-phase mode, and a second power stage circuit supplies additional current under multi-phase mode, based on a control signal generated by the voltage regulator controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If homogeneous power stage circuits optimized for maximum current are used, then the voltage regulator can supply high current, but power conversion efficiency deteriorates under light loads
Solution Approach 1:
The voltage regulator is divided into multiple power stage circuits (first power stage circuit and second power stage circuit) that can operate independently or in combination. The first power stage circuit is optimized for light load operation with higher efficiency, while the second power stage circuit provides additional current capacity. This segmentation allows the system to select the appropriate circuit configuration based on load conditions, resolving the contradiction between high current capability and light load efficiency.
Solution Approach 2:
The voltage regulator dynamically switches between single-phase mode (using only the first power stage circuit) and multi-phase mode (using both first and second power stage circuits) based on the current supply request. This dynamic operation allows the system to optimize power conversion efficiency under light loads by using only the first power stage circuit, while still maintaining the capability to supply high current when needed by activating both circuits.
2Ease of manufacture
If homogeneous power stage circuits are used, then the design is simplified, but power efficiency under light loads deteriorates
Solution Approach 1:
Different power stage circuits are designed with different characteristics optimized for different operating conditions. The first power stage circuit is specifically optimized for light load operation with higher power conversion efficiency, while the second power stage circuit is designed to provide additional current capacity. This local quality differentiation allows each circuit to excel in its intended operating range, resolving the contradiction between design simplicity and light load efficiency.
3Power
If a single power stage circuit optimized for maximum current is used, then the current supply capability is sufficient, but battery life is reduced
Solution Approach 1:
The voltage regulator dynamically selects between single-phase mode and multi-phase mode based on the current supply request from the hardware processor. When the load is light, only the first power stage circuit operates in single-phase mode, achieving higher power conversion efficiency and reducing energy consumption, thereby extending battery life. When high current is needed, both power stage circuits operate together in multi-phase mode to meet the demand. This dynamic operation resolves the contradiction between current supply capability and battery life.
Data Source
AI summary
In an example, a computing device includes a voltage regulator having a voltage regulator controller, a first power stage circuit, and a second power stage circuit. When a control signal indicates that the voltage regulator is to operate in a single-phase mode, the first power stage circuit supplies a first current to a hardware processor and the second power stage circuit does not supply a second current to the hardware processor, where a maximum output current of the first power stage circuit is lower than a maximum output current of the second power stage circuit. When the control signal indicates that the voltage regulator is to operate in a multi-phase mode, the first power stage circuit supplies the first current and the second power stage circuit supplies the second current to the hardware processor.