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Uninterruptible power supply

A technology of power supply and circuit, applied in the field of switching power supply, can solve problems such as low efficiency of step-down circuit, lack of wide variable range, DC bus imbalance, etc., to achieve the effect of improving efficiency, reducing input voltage, and reducing cost

Pending Publication Date: 2018-03-16
EATON MFG LP GLASGOW SUCCURSALE DE MOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The DC bus voltage is greater than twice the peak voltage of the mains, and it does not have a wide variable range for UPSs of different power levels
In addition, due to cost considerations, the number of batteries connected in series is generally small, and the battery voltage is very low compared to the DC bus voltage. When a step-down circuit is used as a charger, if the DC bus is used as the charger input, then Buck circuits are very inefficient
In addition, if half of the DC bus (i.e. positive DC bus or negative DC bus) is used as the charger input, it will make the DC bus unbalanced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0038] image 3 It is a schematic diagram of the circuit structure of the UPS according to the first embodiment of the present invention. The UPS includes a charger circuit, a battery, a PFC circuit, a first capacitor C1, a second capacitor C2, and an inverter. The charger circuit includes a rectifier REC, a third capacitor C3 and a DC / DC converter, and the REC, the third capacitor C3 and the DC / DC converter are connected in parallel. The PFC circuit includes an inductor L1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first switching tube Q1, and a second switching tube Q2. For ease of description, In the present invention, the remaining part of the PFC circuit except the inductor L1 is called an AC / DC conversion module, and the output terminal of the inductor L1 is connected to the input terminal of the AC / DC conversion module. Wherein, the cathode of the fourth diode D4 is connected to the anode of the third diode D3, the cathode of the thir...

no. 2 example

[0049] Figure 8 It is a schematic diagram of the circuit structure of the charger topology according to the second embodiment of the present invention. It includes a charger circuit, a battery, a PFC circuit, a first capacitor C1, a second capacitor C2, and an inverter. The charger circuit includes a rectifier REC, a capacitor C3 and a DC / DC converter, and the REC, the third capacitor C3 and the DC / DC converter are connected in parallel. The PFC circuit includes an inductor L1, first to sixth diodes D1-D6, and first to fourth switch tubes Q1-Q4. The first to sixth diodes D1-D6 and the first to fourth switch tubes Q1-Q4 constitute a typical I-type three-level circuit, which is called an AC / DC conversion module in the present invention. Among them, the first to fourth switch tubes Q1-Q4 are connected in sequence, the first to fourth diodes D1-D4 are connected in sequence, the fifth and sixth diodes D5 and D6 are connected in sequence, and the first to fourth switches The sou...

no. 3 example

[0060] Figure 13 It is a schematic diagram of the circuit structure of the charger topology according to the third embodiment of the present invention. It includes a charger circuit, a battery, a PFC circuit, a first capacitor C1, a second capacitor C2, and an inverter. The charger circuit includes a rectifier REC, a capacitor C3 and a DC / DC converter connected in parallel. The PFC circuit includes an inductor L1, first to fourth diodes D1-D4, and first to fourth switch tubes Q1-Q4. The first to fourth diodes D1-D4 and the first to fourth switch tubes Q1-Q4 constitute a typical T-shaped three-level circuit, which is called an AC / DC conversion module in the present invention. Wherein, the anode of the first diode D1 is connected to the cathode of the second switch tube D2, the anode of the third diode D3 is connected to the anode of the fourth diode D4, and the cathode of the third diode D3 is connected to the cathode of the second switch tube D2. A node between the first d...

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Abstract

The invention provides an uninterruptible power supply including a PFC circuit, a first capacitor, a second capacitor and an inverter connected between the input terminal and the output terminal of the uninterruptible power supply in sequence. The PFC circuit includes an inductors and an AC / DC conversion module. The uninterruptible power supply also includes a charger circuit. The input terminal of the charger circuit is connected to a node and a reference ground between the inductor and the AC / DC conversion module. The output terminal of the AC / DC conversion module is connected to two ends ofa circuit formed by mutual connection of the first capacitor and the second capacitor and is connected to the input terminal of the inverter. A node between the first capacitor and the second capacitor is connected to the reference ground. According to the invention, the PFC circuit is utilized repeatedly, so that the cost is saved and the efficiency is improved.

Description

technical field [0001] The invention belongs to the field of switching power supplies, in particular to an uninterruptible power supply. Background technique [0002] Uninterruptible power supply (UPS) is a kind of power supply equipment that provides uninterrupted, high-quality and reliable AC power to the load, and has the functions of real-time protection and monitoring and monitoring the power supply status. It plays an important role in improving the quality of power supply and ensuring the normal operation of equipment. [0003] The charger is an important component of the UPS. When the mains input is normal, the charger stores electric energy for the battery, and when the mains is interrupted, the UPS immediately switches to the battery mode to continue running. According to the UPS power level, the battery voltage can vary in a large range, and different charger topologies are used to meet different design requirements. [0004] figure 1 A prior art UPS circuit to...

Claims

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Application Information

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IPC IPC(8): H02J7/02H02M1/42H02J9/06
CPCH02J7/022H02J7/02H02J9/06H02M1/4208Y02B70/10
Inventor 蔡火圆高鹏胡双平丁玉松田猛
Owner EATON MFG LP GLASGOW SUCCURSALE DE MOR