Astronavigation secondary power supply magnetic integration phase-shifted full-bridge circuit
By integrating magnetic components in a phase-shifted full-bridge circuit into integrated magnetic components using magnetic integration technology, and using UI-type magnetic cores alternately as transformers and filter inductors, the problem of limited power density improvement caused by multiple magnetic components is solved, and a high-density and lightweight circuit design is achieved.
Patent Information
- Application Number
- CN202511369902.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2026-02-10
AI Technical Summary
Existing phase-shifted full-bridge converters have limited power density improvement due to multiple magnetic components, especially in the aerospace field where weight load sensitivity is a concern.
By employing magnetic integration technology, the magnetic components in the phase-shifted full-bridge circuit are integrated into integrated magnetic components. Two UI-type magnetic cores are used alternately as transformers and filter inductors to reduce the number of magnetic components. The circuit structure is also optimized through synchronous rectification and filtering networks.
The power density of the phase-shifted full-bridge circuit was improved, while the circuit weight and size were reduced, resulting in a compact circuit design.
Smart Images
Figure CN121508322A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of aerospace secondary power supply technology, specifically relating to a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies. Background Technology
[0002] With the continuous development of power electronics technology, the requirements for high frequency, high power density, and integration of DC / DC converters are constantly increasing. Statistics show that magnetic components (such as transformers and inductors) account for 30%–40% of the converter's weight and approximately 20%–30% of its volume, making them a major factor limiting the improvement of converter power density. Phase-shifted full-bridge converters offer advantages such as high power density, flexible control methods, and ease of soft-switching. However, they often require transformers, filter inductors, and primary-side energy storage inductors to achieve soft switching. The presence of multiple magnetic components limits the improvement of converter power density, a problem that is particularly pronounced in the aerospace field where weight loads are highly sensitive. Summary of the Invention
[0003] The purpose of this invention is to provide a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies, which improves the power density of the phase-shifting full-bridge circuit and reduces its weight.
[0004] To achieve the above objectives, this invention provides a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies. It utilizes magnetic integration technology to integrate magnetic components within the phase-shifting full-bridge circuit, creating integrated magnetic components. The aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit includes a DC source V connected in sequence. in The system comprises a full-bridge inverter, integrated magnetic components, a synchronous rectification network, and a filter network. The integrated magnetic components include two UI-shaped magnetic cores placed at a certain distance apart. Each UI-shaped magnetic core includes a U-shaped magnet and a base plate, with a certain distance between the U-shaped magnet and the base plate. Each U-shaped magnet includes two magnetic pillars. A primary winding P is wound on two adjacent magnetic pillars of the two UI-shaped magnetic cores, and secondary windings s1 and s2 are wound on two adjacent magnetic pillars of the two UI-shaped magnetic cores.
[0005] In the aforementioned aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit, the U-shaped magnet has its opening facing downwards, the base plate is placed directly below the U-shaped magnet, and the distance between the magnetic column of the U-shaped magnet and the base plate is h. gap The spacing h gap It is a U-shaped magnet with an air gap.
[0006] The aforementioned aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit includes a full-bridge inverter comprising switching transistors Q1, Q2, Q3, and Q4; a synchronous rectification network comprising rectifier transistors SR1 and SR2; and a filtering network comprising an output filter capacitor C. oThe drains of switching transistors Q1 and Q3 are both connected to the DC power supply V. in The positive terminal is connected, and the source of switching transistor Q2 and the source of switching transistor Q4 are both connected to the DC power supply V. in The negative terminal of the transistor is connected; the source of transistor Q1 is connected to the drain of transistor Q2, and the source of transistor Q3 is connected to the drain of transistor Q4; one end of the primary winding P of the integrated magnetic component is connected to the source of transistor Q1, and the other end is connected to the source of transistor Q3; the secondary windings s1 and s2 of the integrated magnetic component are connected to rectifier transistors SR1 and SR2 respectively, and the output filter capacitor C... o Connected at the midpoint of the two secondary windings and with output filter capacitor C o It is connected in parallel with the load R0.
[0007] In the aforementioned aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit, two UI-type magnetic cores alternately act as transformers and filter inductors. The leakage inductance of the two UI-type magnetic cores together serve as the resonant inductor of the phase-shifting full-bridge circuit, providing energy for the soft switching of each switching transistor.
[0008] The aforementioned aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit includes four switching transistors, each with a diode and a capacitor connected in parallel between their source and drain. Rectifier transistors SR1 and SR2 each include a switching transistor and a diode; the source of the switching transistor is connected to the anode of the diode, and the drain of the switching transistor is connected to the cathode of the diode. The source of rectifier transistor SR1 is connected to the source of rectifier transistor SR2. The secondary windings s1 and s2 of the integrated magnetic component are connected to the drains of rectifier transistors SR1 and SR2, respectively. The output filter capacitor C... o One end is connected to the midpoint of the two secondary windings, and the other end is connected to the source of rectifier tube SR1.
[0009] In the aforementioned aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit, the secondary windings s1 and s2 are wound in the opposite direction to the primary winding P; the winding forms of the secondary windings s1 and s2 and the primary winding P are planar windings or wire windings.
[0010] In the aforementioned aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit, rectifier tubes SR1 and SR2 perform synchronous rectification, and the integrated magnetic secondary-side rectifier network uses synchronous rectification.
[0011] Compared with the prior art, the beneficial technical effects of the present invention are:
[0012] The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit of the present invention integrates magnetic devices in the phase-shifting full-bridge circuit using magnetic integration technology, and integrates them into an integrated magnetic component. The integrated magnetic component includes two UI-type magnetic cores, which alternately act as a transformer and a filter inductor, reducing the number of magnetic components in the circuit, increasing the power density of the phase-shifting full-bridge circuit, and reducing the weight of the phase-shifting full-bridge circuit.
[0013] The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit of the present invention allows the integrated magnetic components to share windings by changing the shape of the magnetic core, thereby reducing the area of the windings, making the circuit structure more compact, and reducing the circuit volume. Attached Figure Description
[0014] The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit of the present invention is given by the following embodiments and figures.
[0015] Figure 1 This is a topology diagram of a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies, according to an embodiment of the present invention.
[0016] Figure 2 This is a schematic diagram of the integrated magnetic component in an embodiment of the present invention.
[0017] Figure 3 This is a schematic diagram of the primary and secondary windings of the integrated magnetic component in an embodiment of the present invention.
[0018] Figure 4 This is a magnetic circuit diagram of the integrated magnetic component in an embodiment of the present invention.
[0019] Figure 5 This is a schematic diagram of a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies, according to an embodiment of the present invention.
[0020] Figure 6 The diagram shows the main half-cycle modes of the magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies according to an embodiment of the present invention. Detailed Implementation
[0021] The following will combine Figures 1-6 The magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies of the present invention will be described in further detail.
[0022] Figure 1 The diagram shown is a topology diagram of a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies according to an embodiment of the present invention.
[0023] like Figure 1 The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit includes a DC source V. in The system consists of a full-bridge inverter, integrated magnetic components, a synchronous rectification network, and a filter network. The full-bridge inverter includes switching transistors Q1, Q2, Q3, and Q4. The synchronous rectification network includes rectifier transistors SR1 and SR2, which perform synchronous rectification. The filter network includes an output filter capacitor C. o This invention utilizes magnetic integration technology to integrate magnetic components in a phase-shifted full-bridge circuit, creating an integrated magnetic component.
[0024] Figure 2 The diagram shown is a schematic diagram of the integrated magnetic component in an embodiment of the present invention.
[0025] like Figure 2 The integrated magnetic component includes two UI-type magnetic cores—UI-type magnetic core T1 and UI-type magnetic core T2—placed at a certain distance, denoted as d. Each UI-type magnetic core includes a U-shaped magnet 10 and a base plate 20. The U-shaped magnet 10 has its opening facing downwards, and the base plate 20 is positioned directly below the U-shaped magnet 10, with a certain distance between the U-shaped magnet 10 and the base plate 20, denoted as h. gap The U-shaped magnet 10 includes two magnetic pillars 11, spaced h apart. gap That is, the distance h between the U-shaped magnet 10, the magnetic post 11, and the base plate 20. gap It consists of a U-shaped magnet, a magnetic column, and an air gap.
[0026] Figure 3 The diagram shown is a schematic diagram of the primary and secondary windings of the integrated magnetic component in an embodiment of the present invention.
[0027] like Figure 3 A primary winding P with N turns is wound on two adjacent magnetic pillars of two UI-type magnetic cores. p Secondary windings s1 and s2 are wound on two adjacent magnetic pillars of two UI-type magnetic cores. The number of turns in the secondary winding s1 is N. s1 The number of turns in the secondary winding s2 is N. s2 The secondary windings s1 and s2 are wound in the opposite direction to the primary winding P. The secondary windings s1 and s2, as well as the primary winding P, are either planar windings or wire windings.
[0028] Figure 4 The diagram shown is a magnetic circuit diagram of the integrated magnetic component in an embodiment of the present invention.
[0029] like Figure 4 I and II are the main magnetic circuits of two UI-type magnetic cores, respectively. The magnetic reluctance of the air gap in the UI-type magnetic core is... Since the spacing between two UI-type magnetic cores affects the magnetic flux, the spacing between magnetic components also needs to be considered. The magnetic reluctance between the two UI-type magnetic cores is... For the primary excitation inductance, Because of R air >>R g >>R Fe Then the excitation inductor For leakage inductance Similarly, leakage can be obtained
[0030] Figure 5 The diagram shown is a schematic of a magnetically integrated phase-shifting full-bridge circuit for aerospace secondary power supplies according to an embodiment of the present invention.
[0031] likeFigure 5 The drains of switching transistors Q1 and Q3 are both connected to the DC power supply V. in The positive terminal is connected, and the source of switching transistor Q2 and the source of switching transistor Q4 are both connected to the DC power supply V. in The negative terminal of the transistor is connected; the source of transistor Q1 is connected to the drain of transistor Q2, and the source of transistor Q3 is connected to the drain of transistor Q4; one end of the primary winding P of the integrated magnetic component is connected to the source of transistor Q1 (drain of transistor Q2), and the other end is connected to the source of transistor Q3 (drain of transistor Q4); the secondary windings s1 and s2 of the integrated magnetic component are connected to rectifier transistors SR1 and SR2 respectively, and the output filter capacitor C... o Connected at the midpoint of the two secondary windings and with output filter capacitor C o It is connected in parallel with the load R0. A diode and a capacitor are connected in parallel between the source and drain of each of the four switching transistors; rectifier transistors SR1 and SR2 each include a switching transistor and a diode, with the source of the switching transistor connected to the anode of the diode and the drain of the switching transistor connected to the cathode of the diode, and the source of rectifier transistor SR1 connected to the source of rectifier transistor SR2; the secondary windings s1 and s2 of the integrated magnetic component are connected to the drains of rectifier transistors SR1 and SR2, respectively; the output filter capacitor C... o One end is connected to the midpoint of the two secondary windings, and the other end is connected to the source of rectifier tube SR1 (source of rectifier tube SR2).
[0032] The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit controls the DC power supply V through phase shifting. in The input value is transformed into a three-level square wave, and the electrical signal is transmitted to the integrated magnetic component. The two UI-type magnetic cores of the integrated magnetic component act as a transformer and a filter inductor respectively in one cycle, playing the roles of voltage transformation and filtering. The rectifier network uses synchronous rectifier tubes SR1 and SR2 to rectify the current on the secondary side of the integrated magnetic component, and then outputs it to the load R0.
[0033] The main half-cycle modes of the magnetically integrated phase-shifting full-bridge circuit of the aerospace secondary power supply are as follows: Figure 6 As shown. Figure 6 (a) is the mode diagram after commutation in mode one. When the synchronous rectifier tube SR2 is turned off, the UI type magnetic core T1 acts as a transformer, and the magnetizing inductance of the UI type magnetic core T2, as well as the leakage inductance of the UI type magnetic core T1 and the leakage inductance of the UI type magnetic core T2 together act as a filter inductor. Figure 6 (b) is the mode diagram for mode two, i.e., when switch Q4 is off. In this mode, the soft-switching energy of switch Q3 is generated by the magnetizing inductance L of the UI-type magnetic core T1. m1 Leakage inductance L leak1 And the excitation inductance L of UI type magnetic core T2 m2 Leakage inductance L leak2 Provide; Figure 6(c) is the mode diagram of mode three, i.e., when the switch Q3 is turned on by ZVS, where the excitation inductance L of the UI type magnetic core T2 is... m2 The energy stored in the diodes begins to discharge to the output terminal. Rectifier diodes SR1 and SR2 begin to commutate. Then, switch Q1 turns off. The parasitic capacitances of switches Q1 and Q2 charge and discharge respectively. The diodes of rectifier diodes SR1 and SR2 turn on, and the input voltage V... in It acts on the leakage inductance of the two UI-type magnetic cores. The other half-cycle is symmetrical to the aforementioned cycle.
[0034] As can be seen from the circuit modes, the two UI-type magnetic cores alternately act as transformers and filter inductors. The leakage inductance of the two UI-type magnetic cores together serve as the resonant inductance of the circuit, providing energy for the soft switching of each switching transistor, thereby reducing the number of magnetic cores and increasing the power density of the converter.
Claims
1. An aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit, characterized in that, The magnetic integration technology is used to integrate magnetic components in a phase-shifted full-bridge circuit into integrated magnetic components; the aerospace secondary power supply magnetic integrated phase-shifted full-bridge circuit includes a DC source V connected in sequence. in The system comprises a full-bridge inverter, integrated magnetic components, a synchronous rectification network, and a filter network. The integrated magnetic components include two UI-shaped magnetic cores placed at a certain distance apart. Each UI-shaped magnetic core includes a U-shaped magnet and a base plate, with a certain distance between the U-shaped magnet and the base plate. Each U-shaped magnet includes two magnetic pillars. A primary winding P is wound on two adjacent magnetic pillars of the two UI-shaped magnetic cores, and secondary windings s1 and s2 are wound on two adjacent magnetic pillars of the two UI-shaped magnetic cores.
2. The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit as described in claim 1, characterized in that, The U-shaped magnet has its opening facing downwards, and the base plate is placed directly below the U-shaped magnet. The magnetic column of the U-shaped magnet is spaced h apart from the base plate. gap The spacing h gap It is a U-shaped magnet with an air gap.
3. The aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit as described in claim 1, characterized in that, The full-bridge inverter includes switching transistors Q1, Q2, Q3, and Q4; the synchronous rectification network includes rectifier transistors SR1 and SR2; and the filter network includes an output filter capacitor C. o The drains of switching transistors Q1 and Q3 are both connected to the DC power supply V. in The positive terminal is connected, and the source of switching transistor Q2 and the source of switching transistor Q4 are both connected to the DC power supply V. in The negative terminal of the transistor is connected; the source of transistor Q1 is connected to the drain of transistor Q2, and the source of transistor Q3 is connected to the drain of transistor Q4; one end of the primary winding P of the integrated magnetic component is connected to the source of transistor Q1, and the other end is connected to the source of transistor Q3; the secondary windings s1 and s2 of the integrated magnetic component are connected to rectifier transistors SR1 and SR2 respectively, and the output filter capacitor C... o Connected at the midpoint of the two secondary windings and with output filter capacitor C o It is connected in parallel with the load R0.
4. The aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit as described in claim 3, characterized in that, The two UI-type magnetic cores alternately function as transformers and filter inductors. The leakage inductance of the two UI-type magnetic cores together serve as the resonant inductor of the phase-shifted full-bridge circuit, providing energy for the soft switching of each switching transistor.
5. The aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit as described in claim 3, characterized in that, Each of the four switching transistors has a diode and a capacitor connected in parallel between its source and drain. Rectifier transistors SR1 and SR2 each include a switching transistor and a diode; the source of the switching transistor is connected to the anode of the diode, and the drain of the switching transistor is connected to the cathode of the diode. The source of rectifier transistor SR1 is connected to the source of rectifier transistor SR2. The secondary windings s1 and s2 of the integrated magnetic component are connected to the drains of rectifier transistors SR1 and SR2, respectively. The output filter capacitor C... o One end is connected to the midpoint of the two secondary windings, and the other end is connected to the source of rectifier tube SR1.
6. The aerospace secondary power supply magnetically integrated phase-shifting full-bridge circuit as described in claim 1, characterized in that, The secondary windings s1 and s2 are wound in the opposite direction to the primary winding P; the winding forms of the secondary windings s1 and s2 and the primary winding P are planar windings or wire windings.
7. The aerospace secondary power supply magnetic integrated phase-shifting full-bridge circuit as described in claim 3, characterized in that, Rectifier tubes SR1 and SR2 are rectified synchronously, and the integrated magnetic secondary-side rectifier network uses synchronous rectification.