540V-to-270V direct current power supply based on three-phase staggered Buck

Abstract

The utility model discloses a 540V-to-270V direct current power supply based on three-phase staggered Buck, which comprises an input line, a Buck circuit, an output line and a control unit, the input end of the Buck circuit is connected with the input line, the output end of the Buck circuit is connected with the output line, and the Buck circuit and the control unit form a double closed-loop control system; according to the utility model, the input and output ripples of the DC power supply can be reduced, the conversion efficiency and the power density can be improved, wide-range input voltage can be converted into stable 270V DC power, and the DC power supply can directly supply power to onboard electric equipment or can be converted into other DC power through secondary conversion. And the power supply structure requirements of high power density, high conversion efficiency and modularization are met.

Description

Technical Field

[0001] The utility model relates to the field of DC power supplies, and specifically to a 540V to 270V DC power supply based on a three-phase interleaved Buck converter. Background Technique

[0002] A DC power supply is a device that maintains a steady voltage and current in a circuit. With the development of aircraft power electronics technology, the 540V power supply system has emerged. Nowadays, DC power supplies have a wide input voltage range of 400V - 700V and have relatively small input and output ripples. At the same time, most existing DC power supplies use clamping diodes, resulting in a ripple current at the output that is higher than the single-path current and an unstable output voltage. Therefore, a 540V to 270V DC power supply based on a three-phase interleaved Buck converter is proposed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a 540V to 270V DC power supply based on a three-phase interleaved Buck converter to solve the problems of a wide input voltage range, a ripple current at the output that is higher than the single-path current, and an unstable output voltage proposed in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A 540V to 270V DC power supply based on a three-phase interleaved Buck converter includes an input line, a Buck circuit, an output line, and a control unit. The input end of the Buck circuit is connected to the input line, the output end of the Buck circuit is connected to the output line, and the Buck circuit includes a capacitor C1 connected to the input line, a capacitor C2 connected to the output line, and a three-phase half-bridge connected between the capacitor C1 and the capacitor C2. The Buck circuit and the control unit form a double closed-loop control system, which is a voltage and current double closed-loop control system, and the double closed-loop control system includes a voltage regulator, a current regulator, and a PWM modulator.

[0006] Further, the three-phase half-bridge has six MOS transistors Q1 - Q6, and the output end of the three-phase half-bridge is connected to three inductors, and the three inductors include an inductor L1, an inductor L2, and an inductor L3.

[0007] Further, the voltage regulator is used to regulate the voltage signal for the voltage loop of the output capacitor voltage feedback.

[0008] Further, the current regulator is used to regulate the current signal for the current loop of the inductor current feedback; the output end of the PWM modulator is provided with a device for comparing the error signal of the current loop with a carrier wave to generate a KPWM signal.

[0009] The beneficial effects of the present utility model are as follows: The present utility model sets a three-way MOS tube half-bridge, which can reduce the input and output ripple of the DC power supply, improve the conversion efficiency and power density, and realize the conversion of a wide range of input voltages into stable 270V DC power, which can directly supply power to the on-board electrical equipment or be further converted into other DC power through secondary conversion, meeting the requirements of high power density, high conversion efficiency, and modular power supply structure. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the DC power supply of the present utility model;

[0011] Figure 2 It is a principle block diagram of the digital control system of the DC power supply of the present utility model;

[0012] Figure 3 It is a circuit diagram of the DC power supply of the present utility model.

[0013] In the figure: 1 is the first inductor, 2 is the second inductor, 3 is the third inductor, 4 is the three-phase half-bridge, and 41 is the MOS tube. Specific Embodiments

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer to Figures 1-3 , which provides a technical solution of the present utility model. A 540V to 270V DC power supply based on three-phase interleaved Buck includes an input line, a Buck circuit, an output line, and a control unit. The input end of the Buck circuit is connected to the input line, the output end of the Buck circuit is connected to the output line, and the Buck circuit includes a capacitor C1 connected to the input line, a capacitor C2 connected to the output line, and a three-phase half-bridge 4 connected between the capacitor C1 and the capacitor C2; the capacitor C1 and the capacitor C2 serve as filter capacitors; the input voltage of the input line is 200 - 700V, and the output voltage of the output line is 270V; further, the input voltage of the input line is 540V.

[0016] In this embodiment, the mentioned three-phase half-bridge 4 has six MOS transistors 41, namely, six groups of MOS transistors 41 of Q1, Q2, Q3, Q4, Q5, and Q6. The output end of the three-phase half-bridge 4 is connected with three paths of inductors, and the three paths of inductors include inductor L1, inductor L2, and inductor L3. Inductor L1 is the first inductor 1, inductor L2 is the second inductor 2, and inductor L3 is the third inductor 3. Inductor L1, inductor L2, and inductor L3 serve as filter inductors. Among them, the mentioned three-phase half-bridge 4 refers to a six-MOS transistor circuit to achieve vector control and square-wave control in the circuit.

[0017] In this embodiment, the mentioned Buck circuit and the control unit form a double-closed-loop control system. This double-closed-loop control system is a voltage and current double-closed-loop control system, and the double-closed-loop control system includes a voltage regulator, a current regulator, and a PWM modulator. The voltage regulator is used to regulate the voltage signal for the voltage loop of the output capacitor voltage feedback. The current regulator is used to regulate the current signal for the current loop of the inductor current feedback. The output end of the PWM modulator is provided with a device for comparing the error signal of the current loop with the carrier wave to generate a KPWM signal. Among them, the transfer function of the filter link of the current loop has a first transfer function and a second transfer function. The mentioned first transfer function = I / sL, and the mentioned second transfer function = (I / sC + Rs) / R. To achieve a better current sharing effect for the three paths, double-closed-loop control is adopted. The voltage loop stabilizes the output voltage, the current loop speeds up the response speed, and ensures the balance of each path of current. The double-closed-loop control system is an interleaved Buck main circuit control system and an interleaved Buck slave circuit control system.

[0018] The 540V to 270V DC power supply based on three-phase interleaved Buck can be physically designed according to the rated output power of 6000W. The physical efficiency can reach 98.5%, and the power density is as high as 350W / in³. Among them, through the set three-phase half-bridge of the three paths of MOS transistors 41, the input and output ripples of the DC power supply can be greatly reduced, the conversion efficiency and power density are greatly improved, and the output ripple current is lower than 40% of the single-path current.

[0019] To sum up: The 540V to 270V DC power supply based on three-phase interleaved Buck uses MOS transistors 41 to replace the clamping diodes in the existing DC power supply, solves the power supply problem of other electrical equipment on the aircraft with a wide voltage input range under the 540V power supply system, meets the power supply design requirements of high power density, high conversion efficiency, and modularization, and can provide a step-down power supply solution for the 540V high-voltage power supply system of the aircraft.

[0020] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0021] The above embodiments only represent the preferred implementation modes of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. Among them, there are various ways of detachable installation. For example, it can be in the way of cooperation between plugging and buckling, or, for example, in the way of bolt connection, etc.

[0022] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A 540V to 270V DC power supply based on a three-phase interleaved Buck, characterized in that: It includes an input line, a Buck circuit, an output line and a control unit. The input end of the Buck circuit is connected to the input line, the output end of the Buck circuit is connected to the output line, and the Buck circuit includes a capacitor C1 connected at the input line, a capacitor C2 connected at the output line, and a three-phase half-bridge connected between the capacitor C1 and the capacitor C2; the Buck circuit and the control unit form a double-closed-loop control system, this double-closed-loop control system is a voltage and current double-closed-loop control system, and the double-closed-loop control system includes a voltage regulator, a current regulator and a PWM modulator.

2. A 540V to 270V DC power supply based on a three-phase interleaved Buck as claimed in claim 1, characterized in that: The three-phase half-bridge has six MOS transistors Q1-Q6, the output end of the three-phase half-bridge is connected with three inductors, and the three inductors include an inductor L1, an inductor L2 and an inductor L3.

3. A 540V to 270V DC power supply based on a three-phase interleaved Buck as claimed in claim 1, characterized in that: The voltage regulator is used to regulate the voltage signal for the voltage loop of the output capacitor voltage feedback.

4. A 540V to 270V DC power supply based on a three-phase interleaved Buck as claimed in claim 1, characterized in that: The current regulator is used to regulate the current signal for the current loop of the inductor current feedback; the output end of the PWM modulator is provided with a device for comparing the error signal of the current loop with the carrier wave to generate a KPWM signal.

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