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DC power supply units, motor drives and refrigeration cycle applications

A DC power supply and motor technology, which is applied in AC motor control, motor generator control, lighting and heating equipment, etc., can solve the problem of increasing switching loss, and achieve the effects of simple control, high boost ratio, and high efficiency.

Active Publication Date: 2019-04-23
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a DC power supply device, the usual structure is to change the energy stored in the reactor by changing the switching operation to change the step-up ratio, but there is a problem that the switching loss increases when the switching frequency is increased.

Method used

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  • DC power supply units, motor drives and refrigeration cycle applications
  • DC power supply units, motor drives and refrigeration cycle applications
  • DC power supply units, motor drives and refrigeration cycle applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] figure 1 is a diagram showing an example of the configuration of the DC power supply device according to the first embodiment. like figure 1 As shown, the DC power supply device 100 according to Embodiment 1 is configured to convert the three-phase AC supplied from the AC power supply 1 into DC and supply it to the load 11 according to the operating state of the load 11 . In addition, in this embodiment, although the inverter load etc. which drive the motor of the compressor used for a refrigeration cycle apparatus were assumed as load 11, it is obvious that it is not limited to this.

[0058] The DC power supply device 100 is provided with: a rectifier circuit 2 which rectifies the three-phase AC; stage, and each phase of the three-phase AC is respectively inserted between the AC power source 1 and the rectifier circuit 2; the first capacitor 6a and the second capacitor 6b, which are connected in series between the output terminals to the load 11; as the first switch...

Embodiment approach 2

[0105] Figure 5 It is a figure which shows an example of a structure of the DC power supply apparatus concerning Embodiment 2. In addition, the same code|symbol is attached|subjected to the same or equivalent structural part as Embodiment 1, and the detailed description is abbreviate|omitted.

[0106] Figure 5 The shown DC power supply device 100a according to the present embodiment is constituted by reactors 50, 51, 52 provided in respective phases, wherein the reactors 50, 51, 52 are the ones described in the first embodiment. figure 1 In the shown structure, the first reactor 3 and the second reactor 8 are magnetically coupled to each other and are magnetically coupled reactors.

[0107] By employing such a configuration, it is possible to reduce the volume of space occupied by the reactor when configuring the DC power supply device 100a. In particular, if the reactor 50 , 51 , 52 is provided with an intermediate tap connected to the capacitor bank 9 , it can be config...

Embodiment approach 3

[0113] Image 6 is a diagram showing an example of the configuration of a DC power supply device according to Embodiment 3. In addition, the same code|symbol is attached|subjected to the same or equivalent structural part as Embodiment 1, and the detailed description is abbreviate|omitted.

[0114] like Image 6 As shown, in the DC power supply device 100b according to the third embodiment, in addition to the figure 1 In addition to the structure shown, the midpoint of the series circuit formed by the first switching element 4a and the second switching element 4b and the midpoint of the series circuit formed by the first capacitor 6a and the second capacitor 6b pass through as a neutral line. The on-off unit 20 of the open unit is connected.

[0115] In the structures of Embodiments 1 and 2 without the on-off unit 20, if any one of the first anti-backflow element 5a, the second anti-backflow element 5b, the first switching element 4a and the second switching element 4b fail...

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Abstract

A first reactor (3) is provided on the input side (AC power supply (1) side) of the rectification circuit (2) for rectifying AC power, and a first reactor (3) connected in series is provided on the output side (load (11) side). A capacitor and a second capacitor (6a, 6b) and a first switching element and a second switching element (4a, 4b), the first switching element and the second switching element (4a, 4b) are used to switch between the first capacitor and the second Charging and non-charging of the second capacitor (6a, 6b), in the above structure, the second capacitor bank (9) is connected with the midpoint of the first switching element and the second switching element (4a, 4b), and will be connected with the first The conduction duty ratios corresponding to the switching elements and the second switching elements (4a, 4b) are controlled to be the same, and at the same time, the output voltage output to the load (11) is boosted, and the above-mentioned second capacitor bank (9) is equipped with the first Three capacitors are connected to each phase terminal on both sides of the rectification circuit in the reactor (3), and are connected in a Y shape.

Description

technical field [0001] The invention relates to a DC power supply device, a motor drive device and refrigeration cycle application equipment. Background technique [0002] Conventionally, commercial power sources such as single-phase AC or three-phase AC have been rectified by a rectifier circuit in which rectifier diodes are connected in a full bridge, and the output of the rectifier circuit is switched by a group of switching elements connected in series to convert energy The energy is stored in a reactor provided before or after the rectification circuit, and the energy is used to charge a capacitor connected in parallel to the switching element group, and the boosted DC voltage is supplied to the load. In such a DC power supply device, the usual structure is to change the energy stored in the reactor by changing the switching operation to change the step-up ratio, but there is a problem that the switching loss increases when the switching frequency is increased. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07H02M7/12
CPCH02M1/4216H02M1/4225H02P2201/09F25B49/025F25B2600/021H02M1/12H02P27/08Y02B30/70Y02B70/10H02M1/42H02M7/06
Inventor 筱本洋介畠山和德神谷庄太植村启介
Owner MITSUBISHI ELECTRIC CORP
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