Power Converter Switching Consumption Reduction
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Solution Overview
Problem
Current step-down direct current power converters consume excessive power due to continuous operation of the switching tube, regardless of load conditions, with no effective method to reduce switching consumption.
Innovation Solution
A power converter design featuring a main switch and an auxiliary switch connected in series, with an energy storing and outputting circuit, a driving circuit that changes switch states based on a preset clock frequency, and feedback and testing circuits to manage energy storage and output, allowing the auxiliary switch to shut down while maintaining load power through stored energy, thereby reducing switching frequency and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switching tube operates continuously in pulse width modulation mode, then the output power can be adjusted, but the switching consumption increases and light loading efficiency deteriorates
Solution Approach 1:
The patent implements periodic action by introducing a second switching tube that operates in alternating cycles with the first switching tube. When the first switching tube is conducting, the second is off, and vice versa. This periodic switching reduces the overall switching frequency and allows the inductor current to reach zero, enabling the system to operate in discontinuous conduction mode during light loading, thereby reducing switching losses while maintaining output power adjustability.
Solution Approach 2:
The patent applies dynamics by transitioning the system from a fixed continuous conduction mode to a dynamic operation mode where the inductor current can naturally reach zero. The dual switching tube configuration enables the system to dynamically adjust between continuous and discontinuous conduction modes based on load conditions, optimizing efficiency across different operating points while maintaining power adjustment capability.
2Loss of energy
If the switching tube conducting times are reduced to lower consumption, then energy loss decreases, but the ability to maintain stable output power is compromised
Solution Approach 1:
The patent segments the switching function into two separate switching tubes (first and second switching tubes) that operate in alternating phases. This segmentation allows each tube to conduct for a portion of the cycle, reducing the total switching frequency and consumption. The segmented operation maintains output power stability through coordinated switching control while enabling the system to enter low-power states during light loading conditions.
Solution Approach 2:
The patent introduces an intermediary mechanism through the second switching tube that mediates between the first switching tube and the load. This intermediary allows the system to maintain continuous power delivery to the load while reducing the conducting time of individual switching tubes. The second switching tube acts as a bridge, ensuring stable output power even when the first switching tube is in its non-conducting phase, thereby maintaining power stability while reducing overall switching consumption.
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 design reduces switching consumption and improves efficiency during light loading by extending the shutdown cycle of the main switch and decreasing its conducting times, leading to enhanced power utilization and reduced energy expenditure.
Implementation Method 1
an energy storing and outputting circuit connected with a connecting node of the main switch and the after flow switch
Implementation Method 2
the energy storing and outputting circuit includes a first inductor and a first capacitor
Data Source
AI summary
The present disclosure discloses a power converter and a switching power supply device. The power converter includes an energy storing and outputting circuit used for charging a load after storing energy, a main switch used for transmitting input power to the energy storing and outputting circuit when the main switch is conducting, an after flow switch used for supplying an after flow loop to the energy storing and outputting circuit when the main switch is shut down, a driving circuit used for changing connecting states of the main switch and the after flow switch according to a preset clock frequency, and a testing circuit and a feedback circuit, the testing circuit is used for testing a voltage on a connecting node of the main switch and the after flow switch.