Auxiliary Power Supply Circuit With Parallel Startup Charging Paths
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Solution Overview
Problem
Existing auxiliary power supply circuits in power supply systems suffer from insufficient startup speed, low power supply stability when input voltage fluctuates, and high no-load power consumption, leading to reduced reliability and efficiency.
Innovation Solution
The proposed power converter and auxiliary power supply circuit incorporate a first switching transistor, second switching transistors, series resistors, a transformer, and a capacitor, with a controller that controls the transistors to manage voltage fluctuations and improve stability by adding series resistors to the power supply loop, allowing faster charging and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary power supply circuit uses a simple structure without series resistors, then the device complexity is low, but the power supply stability deteriorates when input voltage fluctuates
Solution Approach 1:
Series resistors are introduced as intermediary elements in the power supply path between the input voltage source and the transformer primary winding. These resistors act as mediators that absorb and dampen voltage fluctuations, preventing direct transmission of instability to the transformer and subsequent circuit stages, thereby improving power supply stability without requiring complex control mechanisms
Solution Approach 2:
The series resistors are positioned in advance in the power supply path to cushion against upcoming voltage fluctuations before they reach the transformer. This proactive cushioning effect stabilizes the voltage input to the transformer, preventing instability from propagating through the circuit while maintaining a relatively simple overall structure
2Speed
If the auxiliary power supply circuit uses a single power supply path, then the device complexity is low, but the startup speed is insufficient
Solution Approach 1:
The power supply path is segmented into multiple parallel paths, each with its own series resistors and switching transistors. This segmentation allows different paths to charge the first capacitor simultaneously, significantly reducing the startup time compared to a single sequential path, while the modular structure keeps the overall complexity manageable
Solution Approach 2:
Multiple power supply paths are merged in parallel to charge the first capacitor simultaneously. The combining of multiple charging paths increases the total charging current and reduces the time required to reach the threshold voltage for startup, achieving faster startup speed without requiring an overly complex individual path design
3Loss of energy
If the auxiliary power supply circuit operates without optimized switching control, then the device complexity is low, but the no-load power consumption is high
Solution Approach 1:
The switching transistors are controlled to operate in periodic on-off cycles rather than remaining continuously on. This periodic switching action allows the circuit to draw power only when necessary, significantly reducing no-load power consumption. The switching controller implements this periodic action with relatively simple timing logic, avoiding the need for complex continuous control mechanisms
Solution Approach 2:
The switching control system is designed to automatically adjust its operation based on the circuit's power needs. When the first capacitor is fully charged and the circuit is in no-load condition, the switching transistors automatically cease switching activity, allowing the circuit to service itself by eliminating unnecessary power consumption without requiring external intervention or complex monitoring systems
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 enhances power supply stability, reduces energy losses, and improves startup efficiency by managing voltage fluctuations and ensuring faster capacitor charging through multiple paths, thereby increasing the reliability of the power supply system.
Implementation Method 1
control a magnetic flux change of the primary-side winding of the transformer, so that a secondary-side winding of the transformer supplies power to the power conversion controller
Data Source
AI summary
A auxiliary power supply circuit includes a first switching transistor, second switching transistor, first series resistor, a transformer, a first capacitor, and an auxiliary power supply controller. First terminals of the first switching transistor and the second switching transistor are connected to a positive direct current bus, second terminals of the first switching transistor and the second switching transistor are connected to a negative direct current bus through the first capacitor, a control terminal of the second switching transistor is connected to the first terminal of the first switching transistor, the second switching transistor is connected in parallel to the first series resistor, two terminals of the first capacitor are connected to two terminals of a primary-side winding of the transformer, and a second terminal of the primary-side winding of the transformer is connected to the negative direct current bus.