Wide-range high-efficiency isolation DC-DC power supply

Abstract

The utility model discloses a wide-range high-efficiency isolation DC-DC power supply, which belongs to the technical field of DC-DC power supplies, and comprises a preceding stage buck-boost topology module and a backward stage LLC topology module, the preceding stage buck-boost topology module is connected with the backward stage LLC topology module through a bus, the preceding stage buck-boost topology module is used for voltage input, and the backward stage LLC topology module is connected with the backward stage LLC topology module through a bus. The pre-stage buck-boost topology module operates in a closed-loop control mode to keep bus voltage at a constant voltage value, the post-stage LLC topology module operates in an open-loop mode, and the post-stage LLC topology module outputs voltage; according to the utility model, the pre-stage buck-boost topology module operates in a closed-loop control mode to keep the bus voltage at a constant voltage value, the post-stage LLC topology module operates in an open-loop mode, and the pre-stage buck-boost topology module is simple to control and can adapt to a wide input voltage range; and the rear-stage LLC topology module can work at a fixed switching frequency, so that the LLC design difficulty is reduced, and the output voltage is adjusted.

Description

TECHNICAL FIELD

[0001] The utility model belongs to DC-DC power supply technical field especially relates to a wide range high efficiency's isolated DC-DC power supply. BACKGROUND

[0002] DC-DC is a kind of in DC circuit one voltage value's electric energy becomes another voltage value's electric energy's device, it adopts microelectronic technology, with small surface mounting integrated circuit and microelectronic component assembly into an organic whole.

[0003] LLC topology as a kind of power electronic converter structure, due to its resonant characteristics, especially suitable for the design of high power density power supply. It can maintain high efficiency at high power, while reducing switching loss, reducing electromagnetic interference, suitable for high-end consumer electronics products and electric vehicles charging and other high operating power requirements occasions.

[0004] At present, LLC topology is difficult in design and control, needs to consider gain, frequency, soft-switching operation and control strategy and multiple factors, to ensure that it can be stable under wide range of input voltage and load conditions Run. UTILITY MODEL CONTENTS

[0005] The utility model aims at: in order to solve the above-mentioned problems, and propose a kind of wide range high efficiency's isolated DC-DC power supply.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme: a kind of wide range high efficiency's isolated DC-DC power supply, it includes front-stage step-up / down topology module and rear-stage LLC topology module, the front-stage step-up / down topology module is connected with the rear-stage LLC topology module by bus, the front-stage step-up / down topology module carries out voltage input, the front-stage step-up / down topology module keeps bus voltage at constant voltage value in closed loop control mode, the rear-stage LLC topology module operates in open loop mode, and the rear-stage LLC topology module carries out voltage output.

[0007] As the further description of the above technical scheme:

[0008] The front-stage step-up / down topology module is Buck / Boost module.

[0009] As described above, since the above technical scheme is adopted, the utility model has the beneficial effects:

[0010] The utility model discloses, through the closed loop control mode of the operation of the former stage step -up and step -down topology module keeps the bus voltage at the constant voltage value, the open loop mode of the operation of the latter stage LLC topology module, the simple control of former stage step -up and step -down topology module can adapt wide input voltage range, because the bus voltage is constant, the fixed switching frequency of the operation of the latter stage LLC topology module reduces the design difficulty of LLC, output voltage adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a kind of wide range high efficiency isolated DC-DC power supply schematic diagram. DETAILED DESCRIPTION

[0012] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.

[0013] Please refer to Figure 1 The utility model provides a kind of technical scheme: a kind of wide range high efficiency isolated DC-DC power supply, including former stage step -up and step -down topology module and latter stage LLC topology module, the former stage step -up and step -down topology module is connected with the latter stage LLC topology module by bus, the former stage step -up and step -down topology module carries out voltage input, the closed loop control mode of the operation of the former stage step -up and step -down topology module keeps the bus voltage at the constant voltage value, the open loop mode of the operation of the latter stage LLC topology module, and the latter stage LLC topology module carries out voltage output;

[0014] The former stage step -up and step -down topology module is Buck / Boost module.

[0015] Working principle: the closed loop control mode of the operation of the former stage step -up and step -down topology module keeps the bus voltage at the constant voltage value, the open loop mode of the operation of the latter stage LLC topology module, the simple control of former stage step -up and step -down topology module can adapt wide input voltage range, because the bus voltage is constant, the fixed switching frequency of the operation of the latter stage LLC topology module reduces the design difficulty of LLC, output voltage adjustment: for different output voltage, different load's working condition, the precise control of output voltage is realized by adjusting bus voltage target value.

[0016] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A wide-range high-efficiency isolated DC-DC power supply, characterized by: The application relates to a power supply device, which comprises a front-stage Buck / Boost topology module and a rear-stage LLC topology module, wherein the front-stage Buck / Boost topology module is connected with the rear-stage LLC topology module through a bus, the front-stage Buck / Boost topology module is used for voltage input, the front-stage Buck / Boost topology module runs in a closed-loop control mode to keep the bus voltage at a constant voltage value, the rear-stage LLC topology module runs in an open-loop mode, and the rear-stage LLC topology module is used for voltage output.

2. A wide-range high-efficiency isolated DC-DC power supply according to claim 1, characterized in that, The front-stage Buck / Boost topology module is a Buck / Boost module.

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