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Power inductor evaluation device and power inductor evaluation program

A technology for power inductors and evaluation devices, which is applied in the field of evaluation devices for power inductors, can solve problems such as not considering DC superposition characteristics, and achieve the selected effect

Active Publication Date: 2019-09-03
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in previous simulations, the power inductor was modeled using ideal RLGC elements (resistor R, capacitor C, inductor L, conductance G) without considering DC superposition characteristics

Method used

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  • Power inductor evaluation device and power inductor evaluation program
  • Power inductor evaluation device and power inductor evaluation program
  • Power inductor evaluation device and power inductor evaluation program

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0040] First, use figure 1 The configuration of the power inductor evaluation device 1 according to the first embodiment will be described. figure 1 It is a block diagram showing the configuration of the power inductor evaluation device 1 . figure 2 It is a diagram showing an example of a circuit model (simulation model) of a DC-DC converter to which an equivalent circuit model of a power inductor used in the power inductor evaluation device 1 is applied.

[0041] The evaluation device 1 of a power inductor is a device that supports selection of a power inductor and optimization of design when designing a DC-DC converter. Therefore, the power inductance evaluation device 1 includes an input receiving unit 10 , an information processing unit 20 , and a display unit 30 . In addition, the information processing unit 20 includes a storage unit 21 , a determination unit 22 , and an acquisition unit 23 .

[0042] The input accepting unit 10 is constituted by, for example, a keyb...

Embodiment

[0066] Here, for two types of DC-DC converters having the operating conditions (condition 1 and condition 2) shown in Table 1, whether or not to use a power inductor was determined using the slope α of the DC superposition characteristic and the saturation current value Isat. In addition, it was determined using figure 2 A simulation model 100 of a DC-DC converter is shown. In addition, the criterion for judging is whether the peak current Ipeak in the power inductor has reached the limit current for stopping the operation of the DC-DC converter (see Table 1).

[0067] 【Table 1】

[0068] Condition 1 Condition 2 frequency 3.2MHz 1.6MHz Input and output voltage 4 / 2.0V 4 / 2.0V inductance 1.0μH 2.2μH Output current 2A 1.5A Limiting current 3.1A 2.4A

[0069] For condition 1, Figure 5 It shows that the saturation current Isat of the power inductor is changed between 1.5 (A) and 2.5 (A) around 2 (A), which is the maximum o...

no. 2 approach

[0084] In the power inductance evaluation device 1 according to the first embodiment described above, the slope α of the DC superposition characteristic and the saturation current Isat are input to the circuit model 100 of the DC-DC converter, but it may be configured to input the DC superposition characteristic. The actual measured value. In addition, in the evaluation device 1 of the above-mentioned power inductor, it is determined and output whether the combination of the slope α of the DC superposition characteristic and the saturation current Isat can be used, but it can also be configured to use the actual measurement value of the above-mentioned DC superposition characteristic (power inductor) The range of operating conditions (for example, output current Iout) of the DC-DC converter that can be used is determined and output.

[0085] So next, use the Figure 7 , 8 , the power inductor evaluation device 2 according to the second embodiment will be described. Here, th...

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Abstract

A power inductor evaluation apparatus includes a storage unit and a determination unit. The storage unit stores the simulation model of a DC-DC converter. The simulation model includes the equivalent circuit model of a power inductor, including a DC superimposition characteristics slope α and a saturation current Isat as parameters. The determination unit inputs the DC superimposition characteristics slope α and the saturation current Isat into the simulation model of the DC-DC converter and performs simulation, and determines whether or not the power inductor having the DC superimposition characteristics slope α and the saturation current Isat is usable on the basis of whether or not the simulation results satisfy design requirements (e.g, a permissible ripple voltage and a peak current).

Description

technical field [0001] The present invention relates to an evaluation device for a power inductor used in a DC-DC converter, and an evaluation program for a power inductor. Background technique [0002] In recent years, in electronic devices such as ICs, lower driving voltages and higher circuit currents have been progressing, and chopper-type (switching-type) DC-DC converters with excellent conversion efficiency have been widely used. A chopper-type DC-DC converter is mainly composed of switching elements, power inductors, capacitors, and diodes, and steps down or boosts (converts) any DC voltage to a desired DC voltage. [0003] In the design of DC-DC converters, in order to verify design requirements such as ripple voltage and overcurrent limit, circuit simulators are used. Conventionally, various simulation methods of DC-DC converters using power inductors have been proposed (for example, Refer to Non-Patent Documents 1 and 2). [0004] Non-Patent Document 1: B.M Hasan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/30G06F30/367G01R31/2848G01R31/40G06F30/36G06F2119/06G06F30/00H02M3/04
Inventor 山长功
Owner MURATA MFG CO LTD
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