Unlock instant, AI-driven research and patent intelligence for your innovation.

Power supply device

A power supply device and power supply technology, applied in the direction of output power conversion devices, electrical components, energy industry, etc., can solve the problems of reducing high-order harmonic current, increasing reactor inductance, and unfavorable problems, so as to improve input power factor, Effect of reducing high-order harmonic current

Inactive Publication Date: 2009-06-24
PANASONIC CORP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is no problem when operating at a normal rated load, but it becomes disadvantageous when operating at a load factor of 50% or less
In addition, due to the reduction of high-order harmonic current, it is not only suitable for IEC high-order harmonic current regulations, but also the input power factor at rated load is set above 99%, the inductance of the reactor used becomes larger, and the overall shape and weight of the circuit , the cost aspect becomes an issue

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power supply device
  • Power supply device
  • Power supply device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0095] figure 1 It is a configuration diagram of the power supply device in the first embodiment of the present invention.

[0096] exist figure 1 In the power supply device shown, the three-phase AC power supply 1 is a commercial power supply, and the terminals of U, V, and W phases are connected to reactors 2, 3, and 4, and the reactors are respectively connected to the first circuit composed of six diodes. AC input terminal u of diode bridge 5 1 , v 1 、w 1 . Also, in the following description, the technical term "diode bridge" means "bridge rectifier circuit", the output terminals of the three-phase AC power supply 1 are simply referred to as U phase, V phase, and W phase, and the technical term "between UV All of "voltage", "voltage between VW", and "voltage between WU" mean the line voltage between the outputs of the three-phase AC power supply 1 .

[0097] The first diode bridge 5 is composed of three phases, which are respectively arranged on the positive output...

Embodiment approach 2

[0131] Figure 15 It is a circuit configuration diagram of the power supply device in the second embodiment of the present invention. Figure 15 Yes, in the circuit configuration diagram of the power supply device in Embodiment 1, a switch mechanism 16 is provided at the connection point between the capacitors 8 to 13 and the diode bridge 5 . The illustrated configuration example of the switching mechanism 16 includes switching elements 16a, 16b, and 16c corresponding to the U-phase, V-phase, and W-phase, respectively, and adopts a three-pole configuration that disconnects all capacitors. In the present embodiment, the basic circuit operation is the same as that in the first embodiment, and the purpose is to realize the operation state of the capacitors 8 to 13 at the time of a small load in response to the case where there is a small load operation state with a load factor of about 30% or less. The prevention of DC overvoltage generated by the boost function, or the improvem...

Embodiment approach 3

[0140] Figure 17 It is a circuit configuration diagram of the power supply device in the third embodiment of the present invention.

[0141] exist Figure 17 In FIG. 2 , it is a circuit configuration diagram of the power supply device in Embodiment 2, and the configuration in which the DC voltage detection means 17 is provided. In the present embodiment, the basic circuit operation is also the same as that of the first embodiment. In addition, by opening the switch mechanism 16, the purpose of preventing the DC overvoltage generated by the step-up action of the capacitors 8 to 13 at the time of light load, or The improvement of the input power factor and the reduction of the harmonic current at the time of light load are the same as the second embodiment. The present embodiment is characterized in that the timing to open the switch mechanism 16 is judged from the DC voltage.

[0142] That is, in the description of Embodiment 2, using Figure 16 , the improvement of variou...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A power supply circuit includes a three-phase AC power source (1), a first diode bridge (5) connected to the three-phase AC power source via reactors, an electrolytic capacitor (14) for smoothing a DC output from the first diode bridge (5), and a load (15), and further includes second and third diode bridges (6, 7) which are connected in series, connected to the DC output of the first diode bridge 5 in parallel, and six capacitors (8-13) which are provided between AC input terminals of the first diode bridge and AC input terminals of the second and third diode bridges, and thus, a harmonic current can be reduced and an input power factor can be improved with a simple configuration.

Description

technical field [0001] The present invention relates to a technology of a power supply device that converts a three-phase AC power supply into a DC current, reduces harmonic currents flowing into the three-phase AC power supply, and improves input power factor. Background technique [0002] Conventionally, as a power supply device that converts three-phase AC power into DC power, a power supply device that performs so-called three-phase full-wave rectification that combines a diode bridge composed of six diodes and a DC reactor installed in its DC output has been used as the most basic Power supply devices have been widely used. However, in such a simple power supply device, the power factor cannot be improved to a certain level or higher, and the generated harmonic current has a problem that it has a bad influence on the system. Therefore, in recent years, a power supply device that converts the current of a three-phase AC power supply close to a sine wave into a DC for th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M1/00
CPCH02M1/12Y02B70/126H02M7/06H02M1/4216Y02B70/10Y02P80/10
Inventor 武田芳彦
Owner PANASONIC CORP