Single Inductor Multi-Output Voltage Regulation Circuit
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Solution Overview
Problem
In power management integrated circuits, multiple output voltage regulation circuits with a single inductor face challenges in maintaining constant output voltages across different loads due to load variations and mutual interference, especially when the bandwidth of the main loop is limited, leading to transitory changes and voltage fluctuations.
Innovation Solution
A voltage regulation circuit with a single inductor and multiple outputs employs a buck topology, where each output circuit has an output control switch controlled by an output voltage sampling signal, a reference current signal, and a clock signal to maintain constant output voltage, and the output control switches are sequenced in each switching period to minimize interference from other loads. This includes using output voltage feedback compensation and current integration circuits to generate reference signals that ensure stable operation without needing slope compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple voltage conversion circuits are used to satisfy different supply voltage requirements, then the ability to provide multiple output voltages is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple voltage conversion functions into a single integrated circuit that provides multiple output voltages from one converter, eliminating the need for separate voltage conversion circuits for each output and thereby reducing overall device complexity
Solution Approach 2:
The voltage conversion circuit is designed with multi-functionality to provide multiple different output voltages simultaneously, allowing a single circuit to perform what would traditionally require multiple separate circuits, thus reducing complexity while maintaining versatility
2Device complexity
If a single inductor with multiple outputs is used, then the device complexity is reduced, but the output voltage stability deteriorates due to load variations and mutual interference
Solution Approach 1:
The patent segments the control of multiple output circuits by sequencing their operation within switching periods, with each output circuit having dedicated control switches that are activated in sequence rather than simultaneously, thereby reducing mutual interference and improving output voltage stability
Solution Approach 2:
The patent implements feedback control mechanisms where each output circuit has control switches regulated by feedback signals that monitor output conditions, allowing the system to maintain stable output voltages despite load variations by continuously adjusting control based on actual output states
3Object-affected harmful factors
If output control switches are sequenced in each switching period, then the mutual interference from other loads is reduced, but the control complexity increases
Solution Approach 1:
The patent applies periodic action by sequencing output control switches in a repeating cycle within each switching period, where each output circuit is activated in a predetermined sequence rather than continuously, thereby reducing mutual interference through time-division multiplexing of the control signals
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
The solution effectively maintains constant output voltages across multiple outputs, reducing the impact of load variations and mutual interference, ensuring stable operation even when one load changes, by sequencing the control of output switches and using integrated current signals to generate reference currents that are independent of inductor current slopes.
Implementation Method 1
a voltage regulation circuit with a structure of a single inductor and multiple outputs can be employed. In this case, the multiple outputs may share a common inductor, and in each switching period, the energy stored in the inductor may be distributed to the multiple outputs
Data Source
AI summary
A voltage regulation circuit can include: a power stage circuit with a single inductor and a plurality of output circuits; each output circuit having an output control switch configured to control a duration of an on time of the output circuit, and an output switch control circuit configured to control the output control switch in accordance with an output voltage sampling signal, a reference current signal that represents an output current of the output circuit, and a clock signal, in order to maintain an output voltage of the output circuit as constant and to decrease interference from load variations of any other of the plurality of output circuits; and where the output control switches are controlled to be on in sequence in each switching period.