Multi-output DC/DC Converter Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-output type DC/DC converters face challenges in maintaining desired electric potentials when load current ratios change significantly, as they rely on a fixed time division method, leading to potential output voltage shifts and instability.
Innovation Solution
A multi-output type DC/DC converter with an output selection circuit that monitors voltage outputs and generates control signals to adjust the switching of current paths through a reactor, ensuring stable voltage distribution across terminals by selecting the earliest rising or falling output pulse from comparison circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a fixed time division method is used to distribute output current, then the number of inductors is reduced and miniaturization is achieved, but the output voltages cannot be maintained at desired electric potentials when load current ratios change significantly
Solution Approach 1:
The patent applies dynamics by making the time division period variable rather than fixed. The control circuit dynamically adjusts the time division period based on detected output voltage levels, allowing the system to adapt to changing load conditions while maintaining a single inductor configuration. This resolves the contradiction by enabling voltage stability without increasing converter size.
Solution Approach 2:
The patent implements feedback through voltage detection circuits that continuously monitor output voltages and feed this information back to the control circuit. The control circuit uses this feedback to adjust the time division period, ensuring output voltages remain at desired electric potentials despite load variations, while maintaining the compact single-inductor design.
2Device complexity
If the time division period is fixed, then the circuit operation is simple, but the output voltage shifts occur when load conditions change
Solution Approach 1:
The control circuit dynamically adjusts the time division period based on detected voltage levels rather than operating with a fixed period. This dynamic adjustment mechanism maintains relatively simple circuit architecture while achieving precise output voltage control under varying load conditions.
Solution Approach 2:
The patent changes the time division period parameter based on operating conditions. The control circuit modifies this parameter dynamically to maintain precise output voltage levels, resolving the contradiction between simple circuit operation and voltage precision under load variations.
3Quantity of substance
If a single inductor is shared between multiple outputs, then component count is reduced, but load fluctuations cause significant output voltage deviations
Solution Approach 1:
The patent uses dynamic adjustment of the time division period to compensate for load fluctuations on the single shared inductor. By varying the duty cycle and time division ratios, the system maintains stable output voltage compositions despite using minimal components including only one inductor.
Solution Approach 2:
The single inductor serves multiple functions by being shared across different output channels through time division. The control circuit enables this universal component to maintain multiple output voltages stably by dynamically adjusting its utilization pattern, reducing component count while preserving voltage stability.
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 configuration allows for automatic adjustment of boosting and inverting operations based on load conditions, preventing significant shifts in output voltages and ensuring stable direct-current outputs despite load fluctuations.
Implementation Method 1
a reactor (inductor) L... a current generated by a discharge of energy accumulated in the reactor
Data Source
AI summary
Disclosed a multi-output type DC/DC converter including: a reactor connected to a direct-current power supply; a first switching circuit composed of switches to apply a current to the reactor; a second switching circuit composed of switches to switch an output from the reactor to any one of output terminals; output voltage detection sections to detect voltages of the output terminals; comparison circuits to compare outputs with a waveform signal of a predetermined frequency; and an output selection circuit to receive inputs form comparison circuits, and to select an output of a comparison circuit, the output having the earliest rise or the earliest fall, so as to generate a control signal pertaining to on and off of the first and/or second switching circuit, wherein a current generated by a discharge of energy accumulated in the reactor is output to any one of the terminals in accordance with the control signal.