一种多路输出开关电源
By employing a single-output winding transformer in a multi-output switching power supply and controlling the conduction time of the path switching module, the problems of complex windings and low efficiency in the prior art are solved, resulting in a smaller PCB layout and higher output efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN GREEN CONNECTION TECH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-17
AI Technical Summary
In existing multi-output switching power supply designs, the use of multi-output winding transformers results in complex windings, low space utilization, and poor output voltage regulation. On the other hand, using a single output winding plus multiple DC-DC conversion circuits requires large power inductors that occupy PCB space and are inefficient.
A single-output winding transformer is used, and the power is distributed by controlling the conduction time of the first and second path switching modules, reducing the DC-DC conversion circuit. MOSFETs are used to control voltage distribution. The design includes an AC input module, a primary power switching module, a main control module, a path switching module, and an output module.
It achieves a smaller PCB layout and higher output efficiency, reduces the use of power inductors, and improves the overall output efficiency of the power supply.
Smart Images
Figure CN224520938U_ABST
Abstract
Claims
1. A multiple output switching power supply, characterized by comprising: include: The system comprises an AC input module, a primary power switch module, a transformer, a main control module, a first path switch module, a second path switch module, a first output module, a second output module, and a third output module. The AC input module is used to connect to external AC power. The input terminal of the primary power switch module is connected to the output terminal of the AC input module. The output terminal of the primary power switch module is connected to the primary side of the transformer. The secondary side of the transformer is connected to the input terminals of the first path switch module and the second path switch module, respectively. The output terminal of the first path switch module is connected to the first output module. The output terminal of the second path switch module is connected to the second output module and the third output module, respectively. The control terminals of the primary power switch module, the first path switch module, and the second path switch module are all connected to the main control module.
2. The multiple output switching power supply of claim 1, wherein It also includes a power supply module, the input of which is connected to the AC input module, and the output of which is connected to the main control module.
3. The multiple output switching power supply of claim 1 wherein, The first path switch module includes a first MOSFET and a second MOSFET. The gates of the first MOSFET and the second MOSFET are both connected to the main control module. The source of the first MOSFET is connected to the secondary side of the transformer. The drain of the first MOSFET is connected to the drain of the second MOSFET. The source of the second MOSFET is connected to the first output module.
4. The multiple output switching power supply of claim 1 wherein, The second path switching module includes a third MOSFET and a fourth MOSFET. The gates of the third MOSFET and the fourth MOSFET are both connected to the main control module. The source of the third MOSFET is connected to the secondary side of the transformer. The drain of the third MOSFET is connected to the drain of the fourth MOSFET. The source of the fourth MOSFET is connected to both the second output module and the third output module.
5. The multiple output switching power supply of claim 1 wherein, It also includes a protocol control module, the output terminals of the first path switch module and the second path switch module are both connected to the protocol control module, and the first output module, the second output module and the third output module are all connected to the protocol control module.
6. The multiple output switching power supply of claim 1 wherein, A fifth MOS transistor is also provided between the first path switch module and the first output module.
7. The multiple output switching power supply of claim 1 wherein, A sixth MOS transistor is also provided between the second path switch module and the second output module.
8. The multiple output switching power supply of claim 1 wherein, A seventh MOS transistor is also provided between the second path switch module and the third output module.
9. The multiple output switching power supply of claim 1 wherein, The transformer has a secondary switching MOSFET on its secondary side. The gate of the secondary switching MOSFET is connected to the main control module, the drain of the secondary switching MOSFET is connected to the secondary side of the transformer, and the source of the secondary switching MOSFET is grounded.
10. The multiple output switching power supply of claim 1 wherein, The AC input module includes an AC input terminal and a rectifier filter circuit. The input terminal of the rectifier filter circuit is connected to the AC input terminal, and the output terminal of the rectifier filter circuit is connected to the primary power switch module.