High-voltage AC / DC multipath-to-multipath power supply

Abstract

The utility model discloses a high-voltage AC / DC multipath-to-multipath power supply, comprising a DC 1.5 KV voltage source, an AC 690V voltage source and an AC 220V voltage source which are connected in parallel, the DC 1.5 KV voltage source is connected with a first rectifier bridge through an EMI filter, the AC 690V voltage source is connected with a second rectifier bridge through an EMI filter, the AC 220V voltage source is connected with a third rectifier bridge through an EMI filter, and the third rectifier bridge is connected with a fourth rectifier bridge through an EMI filter. The first rectifier bridge, the second rectifier bridge and the third rectifier bridge are all connected with a direct current bus, the direct current bus is connected with a first-stage non-isolated AC-to-DC unit and a second-stage isolated DC-to-DC unit, the first-stage non-isolated AC-to-DC unit is connected with a third-stage non-isolated DC-to-DC multipath unit through the second-stage isolated DC-to-DC unit, and the third-stage non-isolated DC-to-DC multipath unit is connected with a third-stage non-isolated DC-to-DC multipath unit through the third-stage isolated DC-to-DC multipath unit. And the second-stage isolated DC-to-DC unit and the third-stage non-isolated DC-to-DC multi-path unit are both connected with the power supply output end. According to the utility model, a multipath AC-DC-to-multipath technology is adopted, so that the reliability and the power density of the auxiliary power supply are improved, and the cost and the space occupancy rate are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical application field of large storage transformer (PCS) auxiliary power supply, and particularly relates to a high-voltage AC-DC multiway to multiway power supply. BACKGROUND

[0002] The energy storage system is applied to 1.5KV level battery cluster, and the auxiliary power supply of the energy storage system also needs to meet the high-voltage DC input requirement. However, when the PCS is tested, the battery cluster is not supplied, and the auxiliary power supply needs to be supplied by the AC side. In order to ensure safety, the high-voltage DC side and the 690V AC side need to be disconnected when the equipment needs to be statically detected or the program needs to be replaced and burned. At this time, the auxiliary power supply needs to be supplied by 220V AC with low voltage and easy to obtain, so as to meet the safety requirement of static test and maintenance. It can be seen that the application requirement of the auxiliary power supply of the energy storage system, especially the PCS, is very complex. The common auxiliary power supply is composed of two, three or even four power supplies, such as two power supply combinations: DC to DC + AC to DC; three power supply combinations: DC to DC + AC to DC + DC to multiway or DC to DC + AC to DC + UPS; four power supply combinations: DC to DC + AC to DC + DC to multiway + UPS. The above auxiliary power supply combinations not only increase the cost, failure rate and installation difficulty, but also occupy space.

[0003] In view of the above, the utility model designs a high-voltage AC-DC multiway to multiway power supply. UTILITY MODEL CONTENTS

[0004] In view of the defects in the prior art, the utility model aims to provide a high-voltage AC-DC multiway to multiway power supply, which adopts a multiway AC-DC to multiway technology, and aims to improve the reliability and power density of the auxiliary power supply, and reduce the cost and space occupancy.

[0005] In order to achieve the above purpose, the utility model is implemented by the following technical scheme: a high-voltage AC-DC multiway to multiway power supply, which comprises DC 1.5KV voltage source, AC 690V voltage source and AC 220V voltage source which are connected in parallel with each other, the DC 1.5KV voltage source is connected with a first rectifier bridge through an EMI filter, the AC 690V voltage source is connected with a second rectifier bridge through an EMI filter, the AC 220V voltage source is connected with a third rectifier bridge through an EMI filter, the first rectifier bridge, the second rectifier bridge and the third rectifier bridge are all connected with a DC bus, the DC bus is connected with a first-stage non-isolated AC to DC unit and a second-stage isolated DC to DC unit respectively, the first-stage non-isolated AC to DC unit is connected with a third-stage non-isolated DC to DC multiway unit through the second-stage isolated DC to DC unit, and the second-stage isolated DC to DC unit and the third-stage non-isolated DC to DC multiway unit are both connected with a power output end.

[0006] As preferred, the first stage non-isolated AC to DC unit adopts Buck-Boost circuit to convert 1.5KV to 400V.

[0007] As preferred, the second stage isolated DC to DC unit adopts LLC soft switching circuit to convert 400V to 24V.

[0008] As preferred, the third stage non-isolated DC to DC multi-unit adopts FLYBACK reverse excitation circuit to convert 24V to three-way voltage, the first way provides isolated voltage ISO_+24V for communication unit, the second way and the third way provide +15V and-24V voltage for master control grid and driving board.

[0009] The utility model has the following beneficial effects:

[0010] The utility model discloses low cost, small, not simple and crude combination mode, but break through and fusion from the technology, the utility model is composed of single power supply, fused all above application, support black start requirement when no alternating current side, support the test requirement of being dragged to when no direct current side, support static test, burning and maintenance work requirement when no alternating current and direct current side. BRIEF DESCRIPTION OF DRAWINGS

[0011] The utility model will be explained in detail in combination with specific embodiment and attached drawing;

[0012] Figure 1 It is the circuit principle diagram of the utility model. SPECIFIC EMBODIMENT

[0013] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model will be further explained in combination with specific embodiment.

[0014] REFERENCE Figure 1The embodiment adopts the following technical scheme: a high-voltage AC-DC multi-path conversion multi-path power supply, comprising DC 1.5KV voltage source CN1, AC 690V voltage source CN2 and AC 220V voltage source CN3 connected in parallel with each other, the DC 1.5KV voltage source CN1 is connected with the first rectifier bridge B1 through the EMI filter F1, the AC 690V voltage source CN2 is connected with the second rectifier bridge B2 through the EMI filter F1, the AC 220V voltage source CN3 is connected with the third rectifier bridge B3 through the EMI filter F1, the first rectifier bridge B1, the second rectifier bridge B2 and the third rectifier bridge B3 are connected with the DC bus Vbus, the DC bus Vbus is connected with the first-stage non-isolated AC-to-DC unit Unit1 and the second-stage isolated DC-to-DC unit Unit2 respectively, the first-stage non-isolated AC-to-DC unit Unit1 is connected with the third-stage non-isolated DC-to-DC multi-path unit Unit3 through the second-stage isolated DC-to-DC unit Unit2, and the second-stage isolated DC-to-DC unit Unit2 and the third-stage non-isolated DC-to-DC multi-path unit Unit3 are connected with the power supply output end DN4.

[0015] It is worth noting that the first-stage non-isolated AC-to-DC unit Unit1 adopts the Buck-Boost circuit to convert 1.5KV into 400V.

[0016] It is worth noting that the second-stage isolated DC-to-DC unit Unit2 adopts the LLC soft switching circuit to convert 400V into 24V, thereby providing +24V voltage for the relay, the BMS and the EMS.

[0017] In addition, the third-stage non-isolated DC-to-DC multi-path unit Unit3 adopts the FLYBACK flyback circuit to convert 24V into three-path voltage, the first path provides isolated voltage ISO_+24V for the communication unit, and the second path and the third path provide +15V and-24V voltage for the master control panel and the driving board.

[0018] The specific embodiment is input in parallel by three voltage sources of DC 1.5KV voltage source CN1, AC 690V voltage source CN2 and AC 220V voltage source CN3, and after EMI filter F1, is merged into the DC bus Vbus through the respective first rectifier bridge B1, second rectifier bridge B2, third rectifier bridge B3, realizes seamless switching of three voltage sources. Because of the huge pressure difference between input and output voltage, and because of the need to realize multi-output and load regulation rate within plus or minus 5%, three-level circuit units are required to match. The three circuit units are first non-isolated AC-to-DC unit Unit1, second isolated DC-to-DC unit Unit2 and third non-isolated DC-to-DC multi-unit Unit3; the first non-isolated AC-to-DC unit Unit1 uses Buck-Boost circuit to convert 1.5KV to 400V. The second isolated DC-to-DC unit Unit2 uses LLC soft switching circuit to convert 400V to 24V, providing +24V voltage for relays, BMS, EMS, etc. The third non-isolated DC-to-DC multi-unit Unit3 uses FLYBACK flyback circuit to convert 24V into three voltages, the first one provides isolated voltage ISO_+24V for communication unit, the second and third ones provide +15V and-24V voltage for master control panel, drive board, etc.

[0019] The specific embodiment has high commercial value and application prospect due to low cost, small size and few on the market.

[0020] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. The skilled person in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high voltage AC-DC multi-to-multi power supply, characterized by, The application relates to a power supply device, which comprises DC 1.5KV voltage source CN1, AC 690V voltage source (CN2) and AC 220V voltage source (CN3) in parallel with each other, the DC 1.5KV voltage source CN1 is connected with a first rectifier bridge (B1) through an EMI filter (F1), the AC 690V voltage source (CN2) is connected with a second rectifier bridge (B2) through the EMI filter (F1), the AC 220V voltage source (CN3) is connected with a third rectifier bridge (B3) through the EMI filter (F1), the first rectifier bridge (B1), the second rectifier bridge (B2) and the third rectifier bridge (B3) are connected with a DC bus (Vbus), the DC bus (Vbus) is connected with a first-stage non-isolated AC-to-DC unit (Unit1) and a second-stage isolated DC-to-DC unit (Unit2) respectively, the first-stage non-isolated AC-to-DC unit (Unit1) is connected with a third-stage non-isolated DC-to-DC multi-unit Unit3 through the second-stage isolated DC-to-DC unit (Unit2), and the second-stage isolated DC-to-DC unit (Unit2) and the third-stage non-isolated DC-to-DC multi-unit Unit3 are connected with a power output end DN4.

2. A high voltage AC / DC multi- to multi- converter power supply according to claim 1, characterized in that, The first-stage non-isolated AC-to-DC unit (Unit1) adopts a Buck-Boost circuit to convert 1.5KV into 400V.

3. A high voltage AC / DC multi- to multi- converter power supply as claimed in claim 1, characterized in that, The second-stage isolated DC-to-DC unit (Unit2) adopts an LLC soft switching circuit to convert 400V into 24V.

4. The high voltage AC / DC multi- to multi- converter power supply of claim 1, wherein, The third-stage non-isolated DC-to-DC multi-unit Unit3 adopts a FLYBACK reverse excitation circuit to convert 24V into three-way voltage, a first way provides an isolated voltage ISO_+24V for a communication unit, and a second way and a third way provide +15V and -24V voltage for a master control panel and a driving panel.

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