Two-stage power supply circuit based on AC-DC module and DC-DC module
By adopting a two-stage power circuit structure in the power supply circuit, using DC-DC internal cycles to reduce energy losses and optimizing the role of the AC-DC module, the power density and efficiency problems in the existing 3-stage power supply scheme are solved, achieving more efficient power conversion and cost reduction.
Patent Information
- Application Number
- CN202421552505.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The existing 3-level power supply solution has problems such as inability to increase power density, decreasing power efficiency step by step and small cost optimization space.
The two-stage power supply circuit based on the AC-DC module and the DC-DC module are adopted to reduce the AC-DC energy loss through the DC-DC internal cycle method, and the AC-DC module is used as a constant bus voltage source to perform necessary supplementary power and feeding.
Effectively reduce energy loss, improve power efficiency, reduce electricity consumption costs, and significantly improve power conversion efficiency.
Smart Images
Figure CN222928127U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a power supply circuit, in particular to a two-stage power supply circuit based on an AC-DC module and a DC-DC module. Background Art
[0002] As Figure 1 shown, in the existing three-stage power supply scheme, generally, an AC-DC module, a DC-DC module 1, and a DC-DC module 2 are connected in series in sequence. The front end of the AC-DC module is used to connect to an AC power supply, and the rear end of the DC-DC module 2 is used to connect to a load. Although this circuit architecture can achieve AC-DC power conversion, in practical applications, the existing three-stage power supply scheme has obvious disadvantages: First, limited by the three-stage circuit architecture scheme, the power density cannot be increased; at the same time, the power efficiency of the existing three-stage scheme decreases gradually, and the overall output efficiency cannot be improved; in addition, limited by the circuit structure, the cost optimization space of the existing three-stage power supply scheme is small, and there is a problem of high-cost application. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a two-stage power supply circuit based on an AC-DC module and a DC-DC module, which can reduce energy loss and improve power supply efficiency, aiming at the deficiencies of the existing technology.
[0004] To solve the above technical problem, the utility model adopts the following technical solutions.
[0005] A two-stage power supply circuit based on an AC-DC module and a DC-DC module, which includes an AC-DC module, a first DC-DC module, and a second DC-DC module. The input end of the AC-DC module is used to connect to an AC power supply. The input end of the first DC-DC module is connected to the output end of the AC-DC module. The output end of the first DC-DC module is used to connect to a first battery load. The input end of the second DC-DC module is connected to the output end of the AC-DC module. The output end of the second DC-DC module is used to connect to a second battery load.
[0006] Preferably, it includes a host computer controller, and the host computer controller is used to send control instructions to the control ends of the first DC-DC module and the second DC-DC module.
[0007] Preferably, it includes a middle computer, the output end of the middle computer is connected to the host computer controller, and the output end of the middle computer is connected to the control ends of the first DC-DC module and the second DC-DC module.
[0008] Preferably, the AC power supply is a 380V AC power supply.
[0009] Preferably, the AC-DC module is a 100-500KW non-isolated PFC module.
[0010] In the two-stage power supply circuit based on the AC-DC module and the DC-DC module disclosed by the present utility model, the AC-DC module is used to convert the alternating current output by the AC power supply into the front-end DC direct current, and then after the first DC-DC module and the second DC-DC module perform DC-DC conversion, a stable and reliable DC current is provided for the battery load. Compared with the prior art, the present utility model adopts the DC-DC internal circulation method, and the electric energy mainly flows between the battery and the DC-DC module, which can effectively reduce the AC-DC energy loss, thereby reducing the power consumption cost and improving the electric energy conversion efficiency. At the same time, the AC-DC module only serves as a constant bus voltage source for necessary charging and power feeding. Compared with the previous scheme combining bipolar isolated AC-DC + low-voltage DC-DC, the efficiency of the present utility model can be significantly improved. Description of the Drawings
[0011] Figure 1 is the circuit block diagram of the existing three-stage power supply scheme;
[0012] Figure 2 is the circuit block diagram of the two-stage power supply of the present utility model;
[0013] Figure 3 is the circuit schematic diagram of the AC-DC module in the present utility model;
[0014] Figure 4 is the circuit schematic diagram of the DC-DC module in the present utility model. Detailed Embodiments
[0015] The present utility model will be described in more detail below with reference to the drawings and embodiments.
[0016] The present utility model discloses a two-stage power supply circuit based on an AC-DC module and a DC-DC module. Please refer to Figure 2 , which includes an AC-DC module 1, a first DC-DC module 2, and a second DC-DC module 3. The input end of the AC-DC module 1 is used to connect to an AC power supply. The input end of the first DC-DC module 2 is connected to the output end of the AC-DC module 1. The output end of the first DC-DC module 2 is used to connect to a first battery load 4. The input end of the second DC-DC module 3 is connected to the output end of the AC-DC module 1. The output end of the second DC-DC module 3 is used to connect to a second battery load 5.
[0017] In the above circuit, in combination with Figures 2 to 4As shown, the AC-DC module 1 is used to convert the alternating current output by the AC power supply into direct current at the front end, and then the first DC-DC module 2 and the second DC-DC module 3 perform DC-DC conversion to provide stable and reliable direct current for the battery load. Compared with the prior art, the present utility model adopts the DC-DC internal circulation method, and the electrical energy mainly flows between the battery and the DC-DC module, which can effectively reduce the AC-DC energy loss, thereby reducing the power consumption cost and improving the power conversion efficiency. At the same time, the AC-DC module only serves as a constant bus voltage source for necessary charging and power feeding. Compared with the previous solution combining bipolar isolation AC-DC and low-voltage DC-DC, the efficiency of the present utility model can be significantly improved.
[0018] Please refer to Figure 2 , regarding the preferred control methods of the AC-DC module 1, the first DC-DC module 2, and the second DC-DC module 3, this embodiment includes a host controller 6, and the host controller 6 is used to send control instructions to the control terminals of the first DC-DC module 2 and the second DC-DC module 3.
[0019] As a preferred method, this embodiment includes a middle controller 7, the output end of the middle controller 7 is connected to the host controller 6, and the output end of the middle controller 7 is connected to the control terminals of the first DC-DC module 2 and the second DC-DC module 3. Among them, the middle controller 7 is used to precisely control the first DC-DC module 2 and the second DC-DC module 3.
[0020] In practical applications, please refer to Figure 3 and Figure 4 , the first DC-DC module 2 and the second DC-DC module 3 consist of multiple switching tubes to form a switching control circuit, and an inductor device forms an isolated or non-isolated conversion circuit. The host controller 6 performs on-off control on this switching control circuit by sending control instructions according to a preset timing sequence.
[0021] As a preferred method, the AC power supply is a 380V AC power supply. Correspondingly, the AC-DC module 1 is a 100-500KW non-isolated PFC module.
[0022] In the two-stage power supply circuit based on the AC-DC module and the DC-DC module disclosed by the present utility model, a DC-DC internal circulation scheme is adopted, enabling energy to mainly flow between the battery and the DC-DC module, reducing the energy loss of the AC-DC module; meanwhile, the AC-DC module in the present utility model only serves as a constant bus voltage source, playing a necessary role in supplementary power supply and power feeding; in addition, compared with the previous scheme of bipolar isolation AC-DC + low-voltage DC-DC, the working efficiency of the present utility model can be significantly improved, thereby reducing the investment in the AC-DC power supply and helping to save the investment cost of the factory power capacity.
[0023] The above description is only a preferred embodiment of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements or improvements made within the technical scope of the present utility model shall be included within the scope protected by the present utility model.
Claims
1. A two-stage power supply circuit based on an AC-DC module and a DC-DC module, characterized in that: The invention comprises an AC-DC module (1), a first DC-DC module (2) and a second DC-DC module (3), wherein the input end of the AC-DC module (1) is used to connect to an AC power source, the input end of the first DC-DC module (2) is connected to the output end of the AC-DC module (1), the output end of the first DC-DC module (2) is used to connect to a first battery load (4), the input end of the second DC-DC module (3) is connected to the output end of the AC-DC module (1), and the output end of the second DC-DC module (3) is used to connect to a second battery load (5).
2. The two-stage power supply circuit based on AC-DC module and DC-DC module as claimed in claim 1, characterized in that: It comprises a host computer controller (6), and the host computer controller (6) is used to send control instructions to the control end of the first DC-DC module (2) and the control end of the second DC-DC module (3).
3. The two-stage power supply circuit based on AC-DC module and DC-DC module as claimed in claim 2, characterized in that: It comprises a middle computer (7), the output end of the middle computer (7) is connected to the upper computer controller (6), and the output end of the middle computer (7) is connected to the control end of the first DC-DC module (2) and the control end of the second DC-DC module (3).
4. The two-stage power supply circuit based on AC-DC module and DC-DC module as claimed in claim 1, characterized in that: The AC power supply is a 380V AC power supply.
5. The two-stage power supply circuit based on AC-DC module and DC-DC module as claimed in claim 1, characterized in that: The AC-DC module (1) is a 100-500KW non-isolated PFC module.