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Ac power supply device

A technology of AC power supply and power storage device, which is applied to circuit devices, battery circuit devices, emergency power supply arrangements, etc., can solve the problem that parallel operation of uninterruptible AC power supply devices cannot be easily realized, and achieve the effect of suppressing current imbalance

Inactive Publication Date: 2005-11-23
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem to be solved by the present invention is that it is impossible to easily realize the good parallel operation of uninterrupted AC power supply devices with voltage adjustment function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The main circuit of the AC power supply device according to Embodiment 1 of the present invention is as follows figure 1 As shown, it is composed of a parallel connection circuit of the first and second uninterruptible AC power supply units UPS-1 and UPS-2. figure 1 Although two uninterruptible AC power supply units UPS-1 and UPS-2 are connected in parallel, of course, there may be more than or equal to three units or only one unit. The first and second uninterruptible AC power supply units UPS-1 and UPS-2 have the same configuration. Therefore, the first uninterruptible AC power supply unit UPS-1 will be described in detail, and the detailed description of the second uninterruptible AC power supply unit UPS-2 will be omitted. In addition, in figure 1 In , the same reference symbols are attached to the same parts, and in order to distinguish the first and second uninterruptible AC power supply units UPS-1 and UPS-2, apostrophes are added to the reference symbols of ea...

Embodiment 2

[0122] Refer below Figure 14 The AC power supply device of the second embodiment will be described. exist Figure 14 ~ Figure 19 in, for which with Figure 1 to Figure 13 Substantially the same parts are assigned the same symbols, and description thereof will be omitted. In addition, in Figure 14 ~ Figure 19 In the description of the , refer to the Figure 1 to Figure 13 .

[0123] The AC power supply device of Embodiment 2 will figure 1 The main circuits of the first and second uninterruptible AC power supply units UPS-1 and UPS-2 of the first embodiment are modified, and the others have the same structure as the power supply unit of the first embodiment. exist Figure 14 Among them, the main circuit of the first uninterruptible AC power supply device in the AC power supply device of embodiment 2 is expressed as such image 3 Same. Figure 14 In the main circuit of the first uninterruptible AC power supply device of the AC power supply device shown in Embodiment 2,...

Embodiment 3

[0127] Figure 15 The main circuit of the first uninterruptible AC power supply unit of the AC power supply unit according to the third embodiment is shown in FIG. The main circuit of the 1st uninterruptible AC power supply device of embodiment 3 will be image 3 The DC-AC converter 7 shown in Embodiment 1 is transformed into a half-bridge type DC-AC converter 7a, and a deformed voltage adjustment unit 70a is provided; image 3 The structure is the same.

[0128] Figure 15 The DC-AC converter 7a is composed of the first and second conversion switches S1, S2, the first and second parallel diodes D11, D12, the first and second conversion capacitors C11, C12, and the second filtering reactor L2, the second filtering capacitor C2 constitutes. In addition, the voltage adjustment unit 70a is constituted by an autotransformer Tr' having a coil Ns.

[0129]A series circuit of the first and second conversion capacitors C11 and C12 is connected in parallel to the capacitor 9 and t...

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Abstract

The subject of this invention is to operate two or more units of AC uninterruptible power supplies with the current of an AC power supply having a voltage regulating function kept within a desired range and with current balance maintained as desirable. A voltage regulating means 70 is connected in series to a transmission path of commercial AC electric power in each AC uninterruptible power supply. A regulating voltage is supplied from a DC-AC converter 7 to the voltage regulating means 70. A correction signal is formed that changes inversely proportionally to the output current of the AC uninterruptible power supply. The output voltage of the DC-AC converter 7 is corrected by the correction signal. When the output current of the AC uninterruptible power supply increases, the regulating voltage is decreased.

Description

technical field [0001] The invention relates to an AC power supply device with voltage adjustment function and current adjustment function. Background technique [0002] As an uninterruptible AC power supply device having a voltage adjustment function, for example, Japanese Patent Laid-Open Publication No. 2000-60026 (hereinafter referred to as Patent Document 1) is known. This uninterruptible AC power supply device includes a transformer for adding or subtracting an adjustment voltage to or from a commercial AC voltage supply line. [0003] However, when it is difficult to supply the required power to the load with only one uninterruptible AC power supply device, a plurality of uninterruptible AC power supply devices are sometimes connected in parallel. At this time, if the uninterruptible AC power supply device has a voltage adjustment function as shown in the above-mentioned Patent Document 1, problems of current imbalance and circulating current will...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02J3/38H02J7/00H02M7/48
Inventor 井山治
Owner SANKEN ELECTRIC CO LTD
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