SIMO DC/DC Converter Hysteresis Control for Area Reduction
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Solution Overview
Problem
Conventional single inductor multiple output (SIMO) DC/DC converters face increased circuit area and power consumption due to the need for multiple amplifiers and compensation circuits, which degrades efficiency and stability, especially when dealing with varying power requirements across output nodes.
Innovation Solution
A SIMO DC/DC converter design that eliminates the use of amplifiers and separate compensation circuits by employing a hysteresis comparison unit and control unit to adjust the time length of current supply based on output voltage thresholds, allowing for dynamic adjustment of peak inductor current without increasing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If amplifiers and compensation circuits are used in conventional SIMO DC/DC converters, then the number of outputs can be increased, but circuit area and complexity significantly increase
Solution Approach 1:
The patent merges the functions of multiple amplifiers and compensation circuits into a single controller that uses pulse-width modulation (PWM) to control the switching of a single inductor. This consolidation eliminates the need for separate amplifiers and compensation circuits for each output, thereby maintaining multi-output capability while significantly reducing circuit area and complexity.
Solution Approach 2:
The single inductor and controller serve multiple output nodes simultaneously through time-multiplexed switching. The controller universally manages power distribution to all output nodes by adjusting duty cycles, making the system multi-functional without requiring dedicated components for each output.
2Ease of operation
If amplifiers and compensation circuits are used in conventional SIMO DC/DC converters, then output control capability is improved, but power consumption increases
Solution Approach 1:
The patent replaces the traditional amplifier-based voltage control mechanism with a switching-based PWM control system. Instead of using continuous analog amplification, the system uses digital-style switching of the inductor with duty cycle adjustment, which significantly reduces power consumption while maintaining precise output control capability.
3Adaptability or versatility
If conventional SIMO DC/DC converter design is used, then multiple outputs can be supported, but efficiency degrades due to increased power consumption
Solution Approach 1:
The patent employs periodic switching of the single inductor to multiple output nodes in a time-multiplexed manner. By periodically charging and discharging the inductor with controlled duty cycles, the system efficiently distributes power to multiple outputs without the continuous power loss associated with traditional amplifier-based approaches.
4Measurement precision
If amplifiers and compensation circuits are used, then output voltage regulation is improved, but circuit stability becomes more difficult to guarantee
Solution Approach 1:
The patent incorporates feedback mechanisms where the controller monitors output voltages and adjusts PWM duty cycles accordingly. This feedback control maintains precise output voltage regulation while simplifying stability analysis compared to traditional amplifier-based compensation circuits, as the switching controller can implement digital compensation strategies.
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 approach reduces circuit area and power consumption while maintaining stability across multiple output nodes, enabling efficient power distribution and extending battery lifespan in portable electronic devices.
Implementation Method 1
A SIMO DC/DC converter design that eliminates the use of amplifiers and separate compensation circuits by employing a hysteresis comparison unit and control unit to adjust the time length of current supply based on output voltage thresholds
Data Source
AI summary
Provided is a single inductor multiple output (SIMO) direct current-to-direct current (DC/DC) converter that may perform DC/DC conversion by transferring, to output nodes, input current that is input and thereby stored in a single inductor. An output selection unit of the SIMO DC/DC converter may select, from output nodes, a first output node to be supplied with current from a driving unit, and provide output voltage of the first output node and reference voltage of the first output node to a hysteresis comparison unit. The hysteresis comparison unit may control on-time and/or inductor peak current by determining whether the output voltage of the first output node is higher than the reference voltage of the first output node by at least a first threshold, and whether the output voltage of the first output voltage is lower than the reference voltage of the first output voltage by at least a second threshold.