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

Electric power converter

A power conversion device and power conversion technology, which are applied to output power conversion devices, electrical components, AC motor control, etc., can solve the problem of not being able to suppress low-frequency noise, and achieve the effects of reducing power consumption and noise.

Inactive Publication Date: 2013-09-04
HITACHI LTD
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the circuit described in Patent Document 1, noise in the low frequency band cannot be suppressed

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
  • Electric power converter
  • Electric power converter
  • Electric power converter

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0034] figure 1 The power conversion device 50 of the first embodiment is shown. figure 1 It is a power conversion device 50 for operating a fan and a pump. The power conversion device 50 is composed of a bidirectional buck-boost chopper 1, a low-pass filter 2, a single-phase inverter 3, and a switching element S controlling the bidirectional buck-boost chopper 1. 1 , S 2 The on and off control circuit 4, and the switching element S that controls the single-phase inverter 3 3 , S 4 , S 5 , S 6 The on and off control circuit 5 constitutes. In addition, the control circuit 4 and the control circuit 5 may be configured separately, or may be configured as a single control circuit 56 . The switching element S of the single-phase inverter 3 3 , S 5 The upper arm constituting the inverter circuit, the switching element S of the single-phase inverter 3 4 , S 6 Forms the lower arm of the inverter circuit. The bidirectional buck-boost chopper 1 consists of a switching elem...

no. 2 Embodiment

[0062] Figure 14 It is a power conversion device showing a second embodiment of the present invention, and the power conversion device is used to operate a plurality of fans and pumps. The power converter showing the second embodiment of the present invention is constituted by connecting one DC power supply E, a plurality of bidirectional buck-boost choppers, a single-phase inverter, and a load in parallel. figure 1 Parts having the same functions as those in the first embodiment shown are denoted by the same symbols. Each bidirectional buck-boost chopper and each single-phase inverter according to each output voltage command v 15 * , v 16 * , v 17 * And the aforementioned control sequence, through each control circuit 1, 2, is controlled switch. As a result, since the output voltage v of each single-phase inverter 15 , v 16 , v 17 Since it can generate a sine wave, it is possible to operate multiple fans and pumps while reducing noise.

no. 3 Embodiment

[0064] Figure 15 It is a power conversion device showing a third embodiment of the present invention. The power conversion device is used to drive a hybrid electric vehicle (hereinafter referred to as "HEV"), a plug-in hybrid electric vehicle (hereinafter referred to as "PHEV"), and an electric vehicle. A three-phase electric motor in an automobile (hereinafter referred to as "EV"). In the power conversion device showing the third embodiment of the present invention, one DC power supply, three bidirectional buck-boost choppers, and three single-phase inverters are connected in parallel, and each single-phase inverter corresponding to the UVW phase is connected in parallel. Each winding L of the device and the three-phase motor u , L v , L w connected to form a pair with figure 1 Parts having the same functions as those in the first embodiment shown are denoted by the same symbols. The bidirectional buck-boost chopper and single-phase inverter of each phase are staggered...

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

Provided is an electric power converter that suppresses noises attributable to steep fluctuations of a square-wave voltage incidental to switching by the power converter. The electric power converter of the present invention is equipped with a first inverter circuit that is connected to the direct-current power supply side and a second inverter circuit that is connected to the load side. The first inverter circuit converts a direct-current power from a direct-current power supply into an electric power having an alternating waveform with an absolute value waveform, and the second inverter circuit inverts the electric power having the absolute value waveform alternately at each cycle in order to convert this electric power into an alternating-current power.

Description

technical field [0001] The invention relates to a power conversion device for interconnecting a DC power source with a power system or a load. Background technique [0002] A power conversion device that receives DC power, converts the DC power into AC power, and outputs the AC power to a load (rotary electric machine, etc.), has a plurality of switching elements that repeat switching operations, thereby Convert the supplied DC power to AC power. figure 2 A typical single-phase power conversion device that converts DC power to AC power is shown in . Such as figure 2 As shown, the power conversion device is configured to connect the DC power source E to the input side of the single-phase inverter 3, and connect the load to the output side of the single-phase inverter 3. In order to control the AC power supplied to the load, according to the control The PWM switching signal of the circuit 7 turns the switching element on or off. Based on the output voltage v thus controlle...

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 Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/007H02P27/06
Inventor 田村浩志安岛俊幸
Owner HITACHI LTD