SIMO DC/DC Power Control for Stable Auxiliary Supply
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Solution Overview
Problem
The existing power-supply devices with multiple auxiliary systems face an increase in size due to the presence of magnetic components like choke coils, which also impede stable power supply to multiple auxiliary systems.
Innovation Solution
A power-supply control device that includes a voltage conversion circuit and a control unit to manage power distribution between a main power-supply and two auxiliary systems, using a single-inductor multi-output (SIMO) DC/DC converter to reduce the number of magnetic components and adjust power supply based on the load state of connected components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If choke coils are provided in multiple locations (secondary side of transformer, first auxiliary power-supply system, and second auxiliary power-supply system), then stable power supply to multiple auxiliary systems is ensured, but the size of the power-supply device increases
Solution Approach 1:
The patent combines multiple power supply functions into a single SIMO DC/DC converter that can output multiple voltages (first voltage and second voltage) from one inductor, replacing the conventional approach that used separate converters and multiple inductors for different auxiliary systems
Solution Approach 2:
The single inductor in the SIMO DC/DC converter serves multiple functions by supporting multiple output voltages and multiple load conditions, enabling it to replace multiple separate inductors while maintaining stable power supply to various auxiliary systems
2Area of stationary object
If the number of choke coils is reduced to decrease device size, then the occupied area is reduced, but stable power supply to auxiliary systems may be impaired
Solution Approach 1:
Multiple power conversion functions that previously required separate inductors are merged into a single inductor within the SIMO DC/DC converter, reducing the total number of magnetic components while maintaining all necessary power supply functions
Solution Approach 2:
The SIMO DC/DC converter changes operating parameters (duty ratios, switching frequencies) to adapt to different load conditions and output voltage requirements, enabling a single inductor to replace multiple inductors while maintaining stable power supply across different operating conditions
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 allows for a reduction in the size of the power-supply device while ensuring stable power delivery to both auxiliary systems by optimizing power distribution according to load states, thereby minimizing the required output capacity from the main battery.
Implementation Method 1
a voltage conversion circuit that steps down a power-supply voltage from the main power-supply and outputs the stepped-down power-supply voltage to the first auxiliary power-supply system and the second auxiliary power-supply system
Data Source
AI summary
A power-supply control device capable of reducing a size of a power-supply device including a main power-supply and a plurality of auxiliary power-supply systems and stably supplying electric power to the plurality of auxiliary power-supply systems is provided. The power-supply control device includes a DC/DC converter that steps down a power-supply voltage from a main battery and outputs the stepped-down power-supply voltage to a first auxiliary power-supply system and a second auxiliary power-supply system; and a controller that stops supply of electric power from the DC/DC converter to the second auxiliary power-supply system when a load of a heater is in a predetermined high-load state, and supplies electric power from the DC/DC converter to the second auxiliary power-supply system when the load of the heater changes from the predetermined high-load state to a predetermined low-load state.