Power Supply Apparatus Frequency Control Circuit
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Solution Overview
Problem
Existing power supply apparatuses face inefficiencies and stability issues due to varying input voltages, leading to power loss and unstable operations in DC-DC converters and LDO regulators, particularly when input voltages exceed target output voltages.
Innovation Solution
A power supply apparatus with a control circuit that includes a voltage-controlled oscillator, comparator circuits, and switching control circuits to dynamically adjust the operating frequency of DC-DC converters based on input voltage levels, preventing unnecessary step-up operations and maintaining stable output voltages by forming alternative current paths when input voltages are higher than set output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the input voltage is higher than the target output voltage, then the power supply can directly supply power without step-up operation, but the existing apparatus continues to perform unnecessary step-up operations causing power loss
Solution Approach 1:
The control circuit performs preliminary comparison between input voltage and target output voltage before initiating step-up operation. The comparator circuit pre-assesses whether step-up conversion is necessary, preventing unnecessary operations before they occur. This resolves the contradiction by eliminating energy waste from premature or unnecessary step-up operations while maintaining simple control logic through voltage comparison.
Solution Approach 2:
The control circuit continuously monitors input voltage levels and provides feedback to the switching control circuit. When input voltage exceeds target output voltage, the feedback mechanism automatically disables the step-up operation. This closed-loop feedback system eliminates power loss from unnecessary operations while maintaining straightforward control circuit design through direct voltage sensing and response.
2Productivity
If the operating frequency is adjusted dynamically based on input voltage, then the efficiency is improved, but the control circuit complexity increases
Solution Approach 1:
The operating frequency of the DC-DC converter is dynamically adjusted based on real-time input voltage conditions. The switching control circuit modifies frequency parameters according to comparator output signals, optimizing conversion efficiency across varying input conditions. This dynamic adaptation improves productivity while maintaining manageable control complexity through parameter adjustment rather than structural complexity.
Solution Approach 2:
The control circuit changes operating parameters (frequency, duty cycle) based on input voltage levels detected by the comparator. By modifying electrical parameters rather than physical structure, the system achieves improved efficiency across different operating conditions while keeping the control circuit architecture relatively simple. Parameter adaptation resolves the contradiction between efficiency and complexity.
3Loss of energy
If alternative current paths are formed when input voltage exceeds output voltage, then power loss is reduced, but the device structure becomes more complex
Solution Approach 1:
The switching control circuit serves multiple functions: it controls the DC-DC converter operation, manages alternative current paths, and responds to voltage comparison signals. By making the control circuit multi-functional, the patent reduces power loss through intelligent path selection without requiring separate dedicated circuits for each function. This universality resolves the contradiction between energy efficiency and structural complexity.
Solution Approach 2:
The comparator circuit acts as an intermediary between voltage sensing and control decision-making. It compares input and target voltages and provides control signals to the switching control circuit, enabling intelligent routing decisions. This intermediary component facilitates alternative current path formation to reduce power loss while maintaining clear, modular circuit structure that doesn't excessively increase complexity.
Data Source
AI summary
A power supply apparatus is provided which includes: a first switch provided between an inductor and a terminal to which a reference voltage is applied; a second switch provided between the inductor and an output terminal; a first comparator circuit that compares an input voltage with a first comparison voltage; a signal generating circuit that outputs a frequency signal according to an output from the first comparator circuit; and a first control circuit that controls the first and second switches based on an output from the signal generating circuit to control an electrical current flowing into the inductor.