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UPS power supply

A power supply and circuit technology, applied in the field of UPS power supply, can solve the problems of high cost, low efficiency, large volume, etc., and achieve the effect of utilizing time period, reducing volume and reducing cost

Active Publication Date: 2012-10-10
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, in the circuit topology where the negative terminal of the battery is connected to the neutral line, no UPS power supply with a battery charging circuit has been proposed.
In the existing circuit topologies used for other battery connection situations, a flyback or forward isolation circuit is often used as the charging circuit, but this isolation conversion circuit is large in size, low in efficiency, and high in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 2 Shown is a schematic diagram of the UPS power supply circuit in this embodiment. The UPS power supply in this embodiment is hooked up in the circuit and utilizes the positive half cycle of the AC power supply to charge the battery. The UPS power circuit includes a UPS rectifier circuit, a first battery and a first step-down Buck circuit.

[0028]Among them, the UPS rectifier circuit includes the first switch S1, the tenth inductor L10, the tenth field effect transistor Q10, the twentieth field effect transistor Q20, the thirtieth field effect transistor Q30, the fortieth field effect transistor Q40, the fifty Effect tube Q50, sixtieth effect tube Q60, twentieth inductance L20 and twentieth capacitor C20, one end of the battery is connected to the first end of the tenth inductance L10, the first switch S1 through the thyristor switch S2, and the first switch S1 The second terminal is the UPS input terminal I / PA, the second terminal of the tenth induct...

Embodiment 2

[0036] Such as image 3 Shown is a schematic diagram of the UPS power supply circuit in this embodiment. The difference between this embodiment and the first embodiment lies in that: when the UPS power supply works in the commercial power mode, it uses the negative half cycle of the power supply to charge the battery.

[0037] Such as image 3 As shown, the UPS power circuit includes a UPS rectifier circuit, a second battery and a second step-down Buck circuit. In the circuit, the second step-down Buck circuit is connected between one terminal B of the UPS rectifier circuit and the neutral line N, and the second step-down Buck circuit uses the negative half cycle of the power supply to charge the second battery BATTERY2. The second buck circuit includes a third field effect transistor Qa3, a third inductor Ls3, a second capacitor DCa2 and a fourth diode Ds4. Wherein, the gate of the third field effect transistor Qa3 is used as the control terminal to connect to the control ...

Embodiment 3

[0042] Such as Figure 4 Shown is a schematic diagram of the UPS power supply circuit in this embodiment. The difference between this embodiment and Embodiment 1 is that a balance current circuit is added to the UPS power supply, and the negative half cycle of the AC power supply can be used to continue to charge the battery on the basis of the original positive half cycle of the AC power supply.

[0043] The balanced current circuit is a Buck-Boost circuit, including a second field effect transistor Qa2, a second inductor Ls2 and a twenty-first diode Ds21. Wherein, the gate of the second field effect transistor Qa2 is used as the control terminal to connect the control signal, the source of the second field effect transistor Qa2 is connected with the source of the UPS rectifier circuit field effect transistor Q20, and the drain of the second field effect transistor Qa2 It is connected with the anode of the twenty-first diode Ds21 and the first end of the second inductance Ls...

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Abstract

The invention discloses a UPS power supply which comprises a UPS rectifier circuit and a battery; one end of the battery is connected with the UPS rectifier circuit through a switch, and the other end thereof is coupled with a midline; the UPS power supply is characterized by further comprising a buck circuit; the buck circuit serves as a battery charging circuit, is mounted in the circuit, and charges the battery with the positive half cycle or the negative half cycle of an AC power supply; the input end of the buck circuit is coupled with the positive bus terminal or the negative bus terminal on one end of the UPS rectifier circuit; the output end of the buck circuit is coupled with the midline; and the load of the buck circuit is the battery. The UPS power supply adopts the buck circuit as the battery charging circuit, can charge the battery with the positive half cycle or the negative half cycle of the power supply, does not need any isolated conversion circuit as the charging circuit, effectively reduces the equipment size, and reduces the cost.

Description

technical field [0001] The present invention relates to UPS power supply. Background technique [0002] The connection of the battery in the UPS power supply is closely related to the topology of the main circuit UPS. In order to improve efficiency and reduce costs, the battery connection is integrated with the main circuit. In the prior art, no UPS power supply with a battery charging circuit has been proposed in the circuit topology in which the negative terminal of the battery is connected to the neutral line. However, in existing circuit topologies for other battery connection situations, a flyback or forward isolation circuit is often used as a charging circuit, but this isolation conversion circuit has a large volume, low efficiency, and high cost. Such as figure 1 As shown, the battery charging circuit in the UPS power supply is an isolation circuit, in which D1, D2, D3, and D4 are all diodes, Qa is a field effect transistor, and T1 is a transformer. Contents of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/02H02J7/10H02J7/00
Inventor 肖学礼
Owner EMERSON NETWORK POWER CO LTD