Dual-input resonant DC-DC converter
By using a dual-input resonant DC-DC converter, the soft-switching characteristics of resonant capacitors and inductors are utilized, combined with fully controllable switching devices, to solve the problems of complex circuits and high costs in traditional systems, thereby achieving continuous adjustment of the output voltage across the entire range and improving system stability.
Patent Information
- Application Number
- CN202423216757.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In traditional distributed power supply systems for renewable energy, multiple energy forms require multiple DC-DC converters, resulting in complex circuit structures and high costs. Furthermore, existing converters struggle to achieve full-range continuous adjustment of the output voltage under different input voltage conditions.
A dual-input resonant DC-DC converter is adopted, including a main power circuit and fully controllable switching devices. Soft switching is achieved through resonant capacitors and resonant inductors. Combined with appropriate control methods, it ensures zero-voltage turn-on of the fully controllable switching devices and zero-current turn-off of the diodes.
It achieves a simple circuit structure, low cost, and high reliability, and can continuously adjust the output voltage across the entire range under different input voltage conditions, thereby reducing system cost and improving system stability and flexibility.
Smart Images
Figure CN223666257U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of power electronics, especially a kind of double-input resonant DC-DC converter. BACKGROUND
[0002] Fossil energy as non-renewable energy is increasingly exhausted, and it is urgent to promote energy sustainable development, optimize energy structure and accelerate energy transformation. Under the current situation, renewable energy power generation shows a good market prospect. At present, the renewable energy power generation forms widely used include photovoltaic power generation, fuel cell power supply, wind power generation, hydroelectric power generation, geothermal power generation and the like, but all have the disadvantages of unstable, discontinuous power supply, climate condition change and the like, so it is necessary to use distributed power supply system of multiple energy combined power supply. In the traditional renewable energy distributed power supply system, each energy form needs a DC-DC converter to convert each energy into direct current output and be connected in parallel on the common DC bus to supply the DC load, but the circuit structure is complex and the cost is high. In order to simplify the circuit structure, a multiple-input DC converter can be used to replace multiple single-input DC converters to improve the stability and flexibility of the system, realize the priority use of energy, and reduce the system cost. The resonant converter has the ability to realize soft switching and can effectively reduce switching loss, so it is widely valued and researched in the field of high-frequency power conversion.
[0003] The utility model aims at the problems of complex interface circuit structure and high economic cost of multi-source access system, and provides a double-input resonant DC-DC converter with simple circuit structure, low cost, high reliability and high efficiency. Moreover, by using appropriate control method, the double-input resonant DC-DC converter proposed in the utility model can realize full-range continuous regulation of output voltage under the condition of same and different two input voltages, all the fully-controlled switching devices are zero-voltage turned on, and all the diodes are zero-current turned off. SUMMARY
[0004] To achieve the above-mentioned purpose, the utility model provides a double-input resonant DC-DC converter, which comprises a main power circuit, the main power circuit comprises two input voltages V in1 , V in2 , two fully-controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor L r , four ordinary diodes D1, D2, D3 and D4, an output DC capacitor C0 and a load R, the positive electrode of the input voltage V in1 is connected with the first wiring terminal p of the fully-controlled switching device S1, the negative electrode of the input voltage V in1 is connected with the input voltage V in2The positive terminal, the anode of the ordinary diode D3, and the cathode of the ordinary diode D4 are connected together, and the input voltage V in2 The negative terminal is connected to the second terminal n of the fully controlled switching device S2. The fully controlled switching device S1 and the fully controlled switching device S2 are located in the same bridge arm. The second terminal n of the fully controlled switching device S1 is connected to the first terminal p of the fully controlled switching device S2 and the resonant capacitor C. r The first terminal p is connected, and the resonant capacitor C r The second terminal n is connected to the resonant inductor L r The first terminal p of the common diodes are connected. Common diodes D1 and D2 are located on the same bridge arm, and common diodes D3 and D4 are located on the same bridge arm. The cathode of common diode D1 is connected to the cathode of common diode D3, the first terminal p of the output DC capacitor C0, and the first terminal p of the load R. The anode of common diode D1 is connected to the resonant inductor L. r The second terminal n of the ordinary diode D2 is connected to the cathode of the ordinary diode D2, the anode of the ordinary diode D2 is connected to the anode of the ordinary diode D4, the second terminal n of the output DC capacitor C0, and the second terminal n of the load R.
[0005] To achieve the above objectives, this utility model provides a dual-input resonant DC-DC converter, including a main power circuit, wherein the main power circuit includes two input voltages V. in1 V in2 Two fully controlled switching devices S1 and S2, and one resonant capacitor C r A resonant inductor L r A transformer TR, four ordinary diodes D1, D2, D3, D4, an output DC capacitor C0, and a load R, wherein the input voltage V in1 The positive terminal is connected to the first terminal p of the fully controllable switching device S1, and the input voltage V in1 The negative terminal is related to the input voltage V. in2 The positive terminal is connected to the second terminal b on the primary winding side of the transformer TR, and the input voltage V in2 The negative terminal is connected to the second terminal n of the fully controlled switching device S2. The fully controlled switching device S1 and the fully controlled switching device S2 are located in the same bridge arm. The second terminal n of the fully controlled switching device S1 is connected to the first terminal p of the fully controlled switching device S2 and the resonant capacitor C. r The first terminal p is connected, and the resonant capacitor C r The second terminal n is connected to the resonant inductor L r The first terminal p is connected, and the resonant inductor L rThe second terminal n of the common diode D1 is connected with the first terminal a of the primary winding side of the transformer TR, the common diode D1 and the common diode D2 are located in the same bridge arm, the common diode D3 and the common diode D4 are located in the same bridge arm, the cathode of the common diode D1 is connected with the cathode of the common diode D3, the first terminal p of the output DC capacitor C0 and the first terminal p of the load R, the anode of the common diode D1 is connected with the first terminal c of the secondary winding side of the transformer TR and the cathode of the common diode D2, the anode of the common diode D3 is connected with the cathode of the common diode D4 and the second terminal d of the secondary winding side of the transformer TR, and the anode of the common diode D2 is connected with the anode of the common diode D4, the second terminal n of the output DC capacitor C0 and the second terminal n of the load R.
[0006] To achieve the above object, the utility model provides a kind of double-input resonance DC-DC converter, including main power circuit, the main power circuit includes two input voltages V in1 、V in2 、Two fully-controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor L r , two common diodes D1, D2, an output DC capacitor C0 and a load R, the input voltage V in1 positive is connected with the first terminal p of the fully-controlled switching device S1, the input voltage V in1 negative is connected with the input voltage V in2 positive, the anode of the common diode D1, the second terminal n of the output DC capacitor C0 and the second terminal n of the load R are connected, the input voltage V in2 negative is connected with the second terminal n of the fully-controlled switching device S2, the fully-controlled switching device S1 and the fully-controlled switching device S2 are located in the same bridge arm, the second terminal n of the fully-controlled switching device S1 is connected with the first terminal p of the fully-controlled switching device S2 and the first terminal p of the resonant capacitor C r , the second terminal n of the resonant capacitor C r is connected with the first terminal p of the resonant inductor L r , the second terminal n of the resonant inductor L r is connected with the cathode of the common diode D1 and the anode of the common diode D2, the cathode of the common diode D2 is connected with the first terminal p of the output DC capacitor C0 and the first terminal p of the load R.
[0007] To achieve the above object, the utility model provides a kind of double-input resonant DC-DC converter, including main power circuit, the main power circuit includes two input voltages V in1 、V in2 、Two fully-controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor L r , a transformer TR, two ordinary diodes D1, D2, an output DC capacitor C0 and a load R, the input voltage V in1 positive pole is connected with the first wiring terminal p of fully-controlled switching device S1, the input voltage V in1 negative pole is connected with the input voltage V in2 positive pole, the second wiring terminal b of transformer TR primary winding side is connected, the input voltage V in2 negative pole is connected with the second wiring terminal n of fully-controlled switching device S2, fully-controlled switching device S1 and fully-controlled switching device S2 are located in same bridge arm, the second wiring terminal n of fully-controlled switching device S1 is connected with the first wiring terminal p of fully-controlled switching device S2, the first wiring terminal p of resonant capacitor C r Second wiring terminal n of resonant capacitor C r The first wiring terminal p of resonant inductor L r Second wiring terminal n of resonant inductor L r The first wiring terminal a of transformer TR primary winding side is connected, the cathode of ordinary diode D1 is connected with the first wiring terminal c of transformer TR secondary winding side, the anode of ordinary diode D2 is connected, the anode of ordinary diode D1 is connected with the second wiring terminal d of transformer TR secondary winding side, the second wiring terminal n of output DC capacitor C0, the second wiring terminal n of load R is connected, the first wiring terminal p of output DC capacitor C0 is connected with the cathode of ordinary diode D2, the first wiring terminal p of load R.
[0008] The utility model discloses a kind of double-input resonant DC-DC converter, and the advantages and positive effects are as follows: provide a kind of novel double-input resonant DC-DC converter circuit.The double-input resonant DC-DC converter is simple in structure, low in cost, high in reliability, high in efficiency, and by using suitable control method, the double-input resonant DC-DC converter proposed in the utility model can realize output voltage full-range continuous regulation under the condition that two input voltages are same and different, all fully-controlled switching devices are zero-voltage open, and all diodes are zero-current off.
[0009] The application will be described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1It is the circuit topological structure diagram of the first embodiment of the double-input resonant DC-DC converter of the utility model;
[0011] Figure 2 It is the circuit topological structure diagram of the second embodiment of the double-input resonant DC-DC converter of the utility model;
[0012] Figure 3 It is the circuit topological structure diagram of the third embodiment of the double-input resonant DC-DC converter of the utility model;
[0013] Figure 4 It is the circuit topological structure diagram of the fourth embodiment of the double-input resonant DC-DC converter of the utility model. DETAILED DESCRIPTION
[0014] The specific embodiments of the utility model are described in detail below with reference to the drawings, so that the purpose, features and effects of the utility model can be fully understood. The embodiment gives detailed implementation and specific operation process, but the protection scope of the utility model is not limited to the embodiment.
[0015] Reference Figure 1 In the first embodiment of the double-input resonant DC-DC converter of the utility model, the main power circuit includes two input voltages V in1 , V in2 , two fully-controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor L r , four ordinary diodes D1, D2, D3, D4, an output DC capacitor C0 and a load R, the positive pole of the input voltage V in1 is connected with the first connection terminal p of the fully-controlled switching device S1, the negative pole of the input voltage V in1 is connected with the second connection terminal n of the fully-controlled switching device S1, the positive pole of the input voltage V in2 is connected with the anode of the ordinary diode D3, the cathode of the ordinary diode D4 is connected, the negative pole of the input voltage V in2 is connected with the second connection terminal n of the fully-controlled switching device S2, the fully-controlled switching device S1 and the fully-controlled switching device S2 are located in the same bridge arm, the second connection terminal n of the fully-controlled switching device S1 is connected with the first connection terminal p of the fully-controlled switching device S2 and the first connection terminal p of the resonant capacitor C r , the second connection terminal n of the resonant capacitor C r is connected with the first connection terminal p of the resonant inductor L r , the ordinary diode D1 and the ordinary diode D2 are located in the same bridge arm, the ordinary diode D3 and the ordinary diode D4 are located in the same bridge arm, the cathode of the ordinary diode D1 is connected with the cathode of the ordinary diode D3, the first connection terminal p of the output DC capacitor C0 and the first connection terminal p of the load R, the anode of the ordinary diode D1 is connected with the resonant inductor L rThe cathode of the common diode D2 is connected with the cathode of the common diode D3, the first terminal p of the output DC capacitor C0 and the first terminal p of the load R.
[0016] With reference to Figure 2 In the second embodiment of the double-input resonant DC-DC converter of the utility model, the main power circuit comprises two input voltages V in1 , V in2 , two fully-controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor L r , a transformer TR, four common diodes D1, D2, D3, D4, an output DC capacitor C0 and a load R, the positive pole of the input voltage V in1 is connected with the first terminal p of the fully-controlled switching device S1, and the negative pole of the input voltage V in1 is connected with the second terminal n of the fully-controlled switching device S2. The positive pole of the input voltage V in2 is connected with the second terminal b of the primary winding side of the transformer TR, and the negative pole of the input voltage V in2 is connected with the second terminal n of the fully-controlled switching device S2. The second terminal n of the fully-controlled switching device S1 is connected with the first terminal p of the fully-controlled switching device S2 and the first terminal p of the resonant capacitor C r , the second terminal n of the resonant capacitor C r is connected with the first terminal p of the resonant inductor L r , the second terminal n of the resonant inductor L r is connected with the first terminal a of the primary winding side of the transformer TR, the common diode D1 and the common diode D2 are located in the same bridge arm, the common diode D3 and the common diode D4 are located in the same bridge arm, the cathode of the common diode D1 is connected with the cathode of the common diode D3, the first terminal p of the output DC capacitor C0 and the first terminal p of the load R, the anode of the common diode D1 is connected with the first terminal c of the secondary winding side of the transformer TR and the cathode of the common diode D2, the anode of the common diode D3 is connected with the cathode of the common diode D4 and the second terminal d of the secondary winding side of the transformer TR, and the anode of the common diode D2 is connected with the anode of the common diode D4, the second terminal n of the output DC capacitor C0 and the second terminal n of the load R.
[0017] With reference to Figure 3 In the third embodiment of the double-input resonant DC-DC converter of the utility model, the main power circuit comprises two input voltages V in1 , V in2 , two fully-controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor Lr , two common diodes D1, D2, an output DC capacitor C0 and a load R, the input voltage V in1 positive and fully controlled switching device S1 first terminal p connected, the input voltage V in1 negative and input voltage V in2 positive, common diode D1 anode, output DC capacitor C0 second terminal n, the second terminal n of the load R connected, the input voltage V in2 negative and fully controlled switching device S2 second terminal n connected, fully controlled switching device S1 and fully controlled switching device S2 in the same bridge arm, fully controlled switching device S1 second terminal n and fully controlled switching device S2 first terminal p, resonant capacitor C r first terminal p connected, resonant capacitor C r second terminal n and resonant inductor L r first terminal p connected, resonant inductor L r second terminal n and common diode D1 cathode, common diode D2 anode connected, common diode D2 cathode and output DC capacitor C0 first terminal p, the first terminal p of the load R connected.
[0018] Referring to Figure 4 , in the fourth embodiment of the double input resonant DC-DC converter of the utility model, the main power circuit comprises two input voltages V in1 , V in2 , two fully controlled switching devices S1, S2, a resonant capacitor C r , a resonant inductor L r , a transformer TR, two common diodes D1, D2, an output DC capacitor C0 and a load R, the input voltage V in1 positive and fully controlled switching device S1 first terminal p connected, the input voltage V in1 negative and input voltage V in2 positive, transformer TR primary winding side second terminal b connected, the input voltage V in2 negative and fully controlled switching device S2 second terminal n connected, fully controlled switching device S1 and fully controlled switching device S2 in the same bridge arm, fully controlled switching device S1 second terminal n and fully controlled switching device S2 first terminal p, resonant capacitor C r first terminal p connected, resonant capacitor C r second terminal n and resonant inductor L r first terminal p connected, resonant inductor L rThe second terminal n of the common diode D1 is connected with the first terminal a of the primary winding side of the transformer TR, the cathode of the common diode D1 is connected with the first terminal c of the secondary winding side of the transformer TR and the anode of the common diode D2, the anode of the common diode D1 is connected with the second terminal d of the secondary winding side of the transformer TR, the second terminal n of the output DC capacitor C0 and the second terminal n of the load R, and the cathode of the common diode D2 is connected with the first terminal p of the output DC capacitor C0 and the first terminal p of the load R.
[0019] The double-input resonant DC-DC converter has the advantages of simple structure, low cost, high reliability and high efficiency, and can realize full-range continuous regulation of output voltage under the condition that two input voltages are the same or different, all full-controlled switching devices are turned on at zero voltage, and all diodes are turned off at zero current.
[0020] The above-described embodiments are merely preferred embodiments of the utility model, and do not limit the concept and scope of the utility model, and various modifications and improvements of the technical scheme of the utility model made by engineering technicians in the field without departing from the design scheme of the utility model shall fall within the protection scope of the utility model, and the technical content of the utility model claimed for protection has been entirely recorded in the claims.
Claims
1. A dual-input resonant DC-DC converter, characterized in that, Includes a main power circuit, which includes two input voltages V in1 V in2 Two fully controlled switching devices S1 and S2, and one resonant capacitor C r A resonant inductor L r Four ordinary diodes D1, D2, D3, and D4, one output DC capacitor C0, and one load R, wherein the input voltage V in1 The positive terminal is connected to the first terminal p of the fully controllable switching device S1, and the input voltage V in1 The negative terminal is related to the input voltage V. in2 The positive terminal, the anode of the ordinary diode D3, and the cathode of the ordinary diode D4 are connected together, and the input voltage V in2 The negative terminal is connected to the second terminal n of the fully controlled switching device S2. The fully controlled switching device S1 and the fully controlled switching device S2 are located in the same bridge arm. The second terminal n of the fully controlled switching device S1 is connected to the first terminal p of the fully controlled switching device S2 and the resonant capacitor C. r The first terminal p is connected, and the resonant capacitor C r The second terminal n is connected to the resonant inductor L r The first terminal p of the common diodes are connected. Common diodes D1 and D2 are located on the same bridge arm, and common diodes D3 and D4 are located on the same bridge arm. The cathode of common diode D1 is connected to the cathode of common diode D3, the first terminal p of the output DC capacitor C0, and the first terminal p of the load R. The anode of common diode D1 is connected to the resonant inductor L. r The second terminal n of the ordinary diode D2 is connected to the cathode of the ordinary diode D2, the anode of the ordinary diode D2 is connected to the anode of the ordinary diode D4, the second terminal n of the output DC capacitor C0, and the second terminal n of the load R.
2. A dual-input resonant DC-DC converter, characterized in that, Includes a main power circuit, which includes two input voltages V in1 V in2 Two fully controlled switching devices S1 and S2, and one resonant capacitor C r A resonant inductor L r A transformer TR, four ordinary diodes D1, D2, D3, D4, an output DC capacitor C0, and a load R, wherein the input voltage V in1 The positive terminal is connected to the first terminal p of the fully controllable switching device S1, and the input voltage V in1 The negative terminal is related to the input voltage V. in2 The positive terminal is connected to the second terminal b on the primary winding side of the transformer TR, and the input voltage V in2 The negative terminal is connected to the second terminal n of the fully controlled switching device S2. The fully controlled switching device S1 and the fully controlled switching device S2 are located in the same bridge arm. The second terminal n of the fully controlled switching device S1 is connected to the first terminal p of the fully controlled switching device S2 and the resonant capacitor C. r The first terminal p is connected, and the resonant capacitor C r The second terminal n is connected to the resonant inductor L r The first terminal p is connected, and the resonant inductor L r The second terminal n is connected to the first terminal a on the primary winding side of the transformer TR. The ordinary diodes D1 and D2 are located on the same bridge arm, and the ordinary diodes D3 and D4 are located on the same bridge arm. The cathode of the ordinary diode D1 is connected to the cathode of the ordinary diode D3, the first terminal p of the output DC capacitor C0, and the first terminal p of the load R. The anode of the ordinary diode D1 is connected to the first terminal c on the secondary winding side of the transformer TR and the cathode of the ordinary diode D2. The anode of the ordinary diode D3 is connected to the cathode of the ordinary diode D4 and the second terminal d on the secondary winding side of the transformer TR. The anode of the ordinary diode D2 is connected to the anode of the ordinary diode D4, the second terminal n of the output DC capacitor C0, and the second terminal n of the load R.
3. A dual-input resonant DC-DC converter, characterized in that, Includes a main power circuit, which includes two input voltages V in1 V in2 Two fully controlled switching devices S1 and S2, and one resonant capacitor C r A resonant inductor L r Two ordinary diodes D1 and D2, an output DC capacitor C0, and a load R, wherein the input voltage V in1 The positive terminal is connected to the first terminal p of the fully controllable switching device S1, and the input voltage V in1 The negative terminal is related to the input voltage V. in2 The positive terminal, the anode of the ordinary diode D1, the second terminal n of the output DC capacitor C0, and the second terminal n of the load R are connected together, and the input voltage V in2 The negative terminal is connected to the second terminal n of the fully controlled switching device S2. The fully controlled switching device S1 and the fully controlled switching device S2 are located in the same bridge arm. The second terminal n of the fully controlled switching device S1 is connected to the first terminal p of the fully controlled switching device S2 and the resonant capacitor C. r The first terminal p is connected, and the resonant capacitor C r The second terminal n is connected to the resonant inductor L r The first terminal p is connected, and the resonant inductor L r The second terminal n is connected to the cathode of the ordinary diode D1 and the anode of the ordinary diode D2. The cathode of the ordinary diode D2 is connected to the first terminal p of the output DC capacitor C0 and the first terminal p of the load R.
4. A dual-input resonant DC-DC converter, characterized in that, Includes a main power circuit, which includes two input voltages V in1 V in2 Two fully controlled switching devices S1 and S2, and one resonant capacitor C r A resonant inductor L r A transformer TR, two ordinary diodes D1 and D2, an output DC capacitor C0, and a load R, wherein the input voltage V in1 The positive terminal is connected to the first terminal p of the fully controllable switching device S1, and the input voltage V in1 The negative terminal is related to the input voltage V. in2 The positive terminal is connected to the second terminal b on the primary winding side of the transformer TR, and the input voltage V in2 The negative terminal is connected to the second terminal n of the fully controlled switching device S2. The fully controlled switching device S1 and the fully controlled switching device S2 are located in the same bridge arm. The second terminal n of the fully controlled switching device S1 is connected to the first terminal p of the fully controlled switching device S2 and the resonant capacitor C. r The first terminal p is connected, and the resonant capacitor C r The second terminal n is connected to the resonant inductor L r The first terminal p is connected, and the resonant inductor L r The second terminal n is connected to the first terminal a on the primary winding side of the transformer TR. The cathode of the ordinary diode D1 is connected to the first terminal c on the secondary winding side of the transformer TR and the anode of the ordinary diode D2. The anode of the ordinary diode D1 is connected to the second terminal d on the secondary winding side of the transformer TR, the second terminal n of the output DC capacitor C0, and the second terminal n of the load R. The cathode of the ordinary diode D2 is connected to the first terminal p of the output DC capacitor C0 and the first terminal p of the load R.