Inverter Bridge Switching Power Source With Capacitor Transformer
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Solution Overview
Problem
Existing switching power source apparatuses require multiple drivers for gate control, leading to complexity and increased cost, and fail to achieve efficient zero-voltage switching.
Innovation Solution
A compact switching power source apparatus using a full-bridge configuration with four switching elements (Q1 to Q4) connected in a diagonal arrangement, where midpoints are linked through a transformer, capacitor, and reactor, ensuring regenerative current paths even during OFF periods of main control switches, enabling zero-voltage switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If six drivers are used to drive gates of six switching elements, then the switching power source can provide two output voltages, but the apparatus becomes complicated and cost increases
Solution Approach 1:
The patent merges the driver functions by using a common driver circuit to control multiple switching elements. Specifically, the driver that generates gate signals for the first and second switching elements is shared, reducing the total driver quantity from six to four while maintaining the capability to provide two output voltages through the full-bridge circuit configuration
Solution Approach 2:
The driver circuit is designed with multi-functionality to control different switching elements based on operational modes. The same driver can generate appropriate gate signals for different switching elements (Q1-Q4) depending on whether the system operates in step-up converter mode or isolated full-bridge circuit mode, eliminating the need for separate dedicated drivers for each switching element
2Loss of energy
If conventional switching power source configuration is used, then multiple drivers are required, but switching loss increases and efficiency decreases
Solution Approach 1:
The patent implements self-service through synchronous rectification where the fourth switching element Q4 acts as an active rectifier that automatically conducts during specific phases. This self-regulating mechanism ensures regenerative current paths are maintained without requiring additional control drivers, reducing both switching loss and driver complexity while improving overall efficiency
Solution Approach 2:
The switching elements are dynamically controlled with optimized timing sequences that enable zero-voltage switching. The control unit generates gate signals with precise timing to ensure switching occurs when voltage across the switching element is zero, minimizing switching loss. The dynamic coordination between Q1-Q4 allows the system to adapt switching patterns based on operational requirements
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 simplifies the apparatus, reduces costs, and achieves high efficiency by ensuring zero-voltage switching across the four switching elements, improving overall performance and stability of output voltages.
Implementation Method 1
a primary winding P1 and secondary windings S1 and S2 of a transformer T
Implementation Method 2
a first rectifying-smoothing circuit that rectifies and smoothes a voltage of a secondary winding of the transformer
Data Source
AI summary
A switching power source apparatus includes a first arm including first and second switching elements, a second arm including third and fourth switching elements, a series circuit connected between a connection point of the first and second switching elements and a connection point of the third and fourth switching elements and including a capacitor and a primary winding, a rectifying-smoothing circuit that rectifies and smoothes a voltage of a secondary winding and provides an output voltage, a reactor connected to a connection point of the first and second switching elements and a DC input end, and a controller that turns on/off the first and second switching elements alternately and the third and fourth switching elements alternately and synchronizes the first and third switching elements with each other and the second and fourth switching elements with each other.