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Power conversion device and induction heating device

A technology of power conversion device and induction heating device, which is applied in the direction of induction heating device, induction heating, electric heating device, etc., can solve the problems of reducing pulsating current, frequency and phase will not be correctly consistent, etc., to suppress heat generation and prolong life , to achieve the effect of miniaturization

Active Publication Date: 2011-08-31
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, even if the frequencies of the carrier signals of the converter and inverter are the same or doubled, there will be delays in conversion, differences in components according to the layout design, and inherent spurious components of the equipment, resulting in a failure of the converter The frequency and phase of the current flowing to the capacitor will not be correctly aligned with the frequency and phase of the current flowing from the capacitor to the inverter
Therefore, even if the technology of Patent Document 2 is used, it is not necessarily possible to reduce the ripple current as expected.

Method used

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  • Power conversion device and induction heating device
  • Power conversion device and induction heating device
  • Power conversion device and induction heating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0064] figure 1 It is a figure which shows the structure of the motor drive apparatus 1 which is one Example of the power conversion apparatus of this invention.

[0065] Such as figure 1 As shown, the motor drive device 1 is composed of an inverter circuit 4 , a capacitor 5 , a current sensor 6 , an inverter circuit 7 , and a control unit 8 . The inverter circuit 4 of the motor drive device 1 is connected to the DC power supply 2 , and the inverter circuit 7 is connected to the motor 3 .

[0066] The converter circuit 4 is configured including an inductor, a switch, and the like. The converter circuit 4 switches on / off the switch according to the pulse width modulation (Pulse Width Modulation, hereinafter abbreviated as "PWM") control performed by the control unit 8, thereby boosting the DC voltage supplied from the DC power supply 2 to desired DC voltage. IGBT, MOSFET, etc. are used for the switch.

[0067]The inverter circuit 7 is a three-phase inverter for driving the...

Embodiment approach 2

[0097] image 3 It is a figure which shows the structure of the induction heating apparatus 100 which is one Example of the induction heating apparatus of this invention.

[0098] Such as image 3 As shown, the induction heating device 100 is composed of a converter circuit, a capacitor 36, a current sensor 37, an inverter circuit 38, a heater 50 and a control unit 60, and the converter circuit is composed of a diode bridge 32, a coil 33, a switch 34 and a diode 35. As a configuration, the heater 50 is constituted by a current sensor 39 , a heating coil 40 , and a resonant capacitor 41 as a load circuit.

[0099] The induction heating device 100 is a heating conditioner. Specifically, it has a top plate (not shown) on the upper part of the heater 50. By supplying a high-frequency current from the inverter circuit 38 to the heating coil 40, the load pot placed on the top plate is for heating.

[0100] The inverter circuit is connected to the AC power supply 31 , and converts...

Embodiment approach 3

[0115] In Embodiment 2 above, an example was shown in which the current sensor 37 is inserted between the capacitor 36 and the inverter circuit 38 to directly detect the current Iinv flowing from the capacitor 36 to the inverter circuit 38 . Here, as Embodiment 3, an example in which a current sensor between the capacitor 36 and the inverter circuit 38 is not required by using the detection result of the load-side current sensor 39 will be described.

[0116] Figure 4 It is a figure which shows the structure of the induction heating apparatus 100a which concerns on one Embodiment of this invention.

[0117] Such as Figure 4 As shown, the induction heating device 100a is composed of a converter circuit, a capacitor 36, an inverter circuit 38, a heater 50 and a control unit 60a. The converter circuit is composed of a diode bridge 32, a coil 33, a switch 34 and a diode 35. The heater 50 is composed of a current sensor 39 , a heating coil 40 and a resonant capacitor 41 .

[0...

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Abstract

Provided is a power conversion device constituted of a converter, a capacitor, and an inverter, wherein a ripple current that flows through the capacitor is suppressed. A current sensor (6) is inserted between the capacitor (5) and an inverter circuit (7), and a current Iinv that flows from the capacitor (5) to the inverter circuit (7) is detected. A frequency detection unit (11) subjects a current waveform of Iinv to a fast Fourier transform and detects a frequency of a frequency component having a maximum amplitude. A phase detection unit (12) detects a zero cross point of the frequency component having the maximum amplitude from the current waveform of Iinv. A carrier signal control unit (13) performs control so that a frequency and a rising timing of a PWM carrier signal for driving a converter circuit (4) are coincided with the frequency detected by the frequency detection unit (11) and the zero cross point detected by the phase detection unit (12).

Description

technical field [0001] The present invention relates to a technique for suppressing pulsating current flowing through a capacitor in a power conversion device including a converter, a capacitor, and an inverter. Background technique [0002] A power conversion device is composed of a converter, a capacitor, and an inverter, and supplies power to a load such as a motor. [0003] The converter is connected to the power supply and transforms the power supply voltage. When the power supply is a system power supply, an AC-DC converter is used, and when it is a high-voltage battery, a DC-DC converter is used. The inverter converts DC voltage to AC voltage and supplies power to the load. The capacitor is arranged between the converter and the inverter, and smoothes the voltage input to the inverter. Generally, electrolytic capacitors suitable for downsizing and cost reduction are used as capacitors. [0004] In a power conversion device, the DC current flowing from the converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M3/155H05B6/06H05B6/12
CPCH05B6/04H02M1/14H05B6/062
Inventor 风间俊田米正树北畠真
Owner PANASONIC CORP
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