Power Supply Apparatus Low Load Efficiency Control
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Solution Overview
Problem
Conventional power supply apparatuses with current resonance circuits suffer from low efficiency in low load states, leading to increased size and cost, and inefficiencies in switching operations.
Innovation Solution
A power supply apparatus with a transformer, switching elements, diodes, and a control unit that manages switching operations by alternating between continuous driving and halt periods, utilizing a charge unit to store energy and switch between charging and discharging states, enabling soft switching and improving efficiency in low load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a two-converter system with flyback converter is adopted to improve low load efficiency, then efficiency in low load state is improved, but device complexity and cost increase
Solution Approach 1:
The power supply apparatus uses a single full-bridge converter that performs multiple functions across different operating modes. The same converter circuit handles both rated load operation and low load operation by switching between continuous driving mode and halt period mode, eliminating the need for separate converters and reducing overall system complexity while maintaining improved low-load efficiency
2Reliability
If continuous driving is used in low load state, then power supply stability is maintained, but energy consumption increases
Solution Approach 1:
The control unit dynamically adjusts the operating mode based on detected load conditions. When light load is detected, the system transitions from continuous driving to halt period mode, reducing energy consumption while maintaining power supply stability through periodic wake-up operations that ensure the output voltage remains stable and responsive to load changes
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 enhances efficiency and reduces noise in low load states, minimizing size and cost while maintaining effective power supply operations.
Implementation Method 1
a first capacitor connected in series with the primary winding, the first capacitor connected in parallel with the second switching element together with the primary winding connected in series with the first capacitor
Implementation Method 2
A half-bridge type current resonance circuit is adopted in many power supply apparatuses
Implementation Method 3
current resonance circuit
Data Source
AI summary
The power supply apparatus having a current resonance circuit includes a charge unit connected to a primary winding of a transformer, and storing electric charge, and a connection unit connected in series with the charge unit, and configured to switch the charge unit between a connecting state in which one of charging and discharging is enabled, and a non-connecting state, and after making the connection unit into the connecting state, while a current is flowing into either one of the first diode and the second diode, the first control unit performs transition from a halt period to an operating period of a switching operation by turning ON the switching element of the one of the first diode and the second diode, the current being flowing into the one of the first diode and the second diode.