Electronic circuit and wireless power transmission device

Patent metadata

Field	Value
Publication number	US-11316437-B2
Application number	US-202016944827-A
Country	US
Kind code	B2
Filing date	Jul 31, 2020
Priority date	Aug 2, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

An electronic circuit to receive input AC signals having different phases, and to control bidirectional switches corresponding to phases to generate, based on input AC signals having the phases, output AC signals having the phases and having a frequency different from a frequency of the input AC signals, the electronic circuit has reference signal circuitry to generate a reference signal having a frequency higher than the frequency of the output AC signals, and a commutation circuitry to control switching between voltage commutation and current commutation, wherein, in the voltage commutation, the commutation circuitry switches the bidirectional switches corresponding to the phases in sequence based on a voltage level of the output AC signals of the phases before and after a time point when an amplitude of the reference signal becomes a specific amplitude value, and in the current commutation, the commutation circuitry switches the bidirectional switches in parallel.

First claim

The invention claimed is:

1. An electronic circuit configured to receive input AC signals having phases different from one another, and to control bidirectional switches corresponding to the phases to generate output AC signals having the phases and having a frequency different from a frequency of the input AC signals, and to output the output AC signals, the electronic circuit comprising:
reference signal circuitry configured to generate a reference signal having a frequency higher than the frequency of the output AC signals; and
commutation circuitry configured to control switching between voltage commutation and current commutation, wherein, in the voltage commutation, the commutation circuitry is configured to switch the bidirectional switches corresponding to the phases in sequence based on a voltage level of the output AC signals of the phases in a first period before and after a time point when an amplitude of the reference signal becomes a specific amplitude value, and in the current commutation, the commutation circuitry is configured to switch the bidirectional switches in parallel based on a current level of the output AC signals of the phases in a second period other than the first period,
wherein, in a phase among the phases in which a current of the output AC signals reaches zero, the commutation circuitry selects the voltage commutation in the first period including a time point when the current of the output AC signal reaches zero and selects the current commutation at a time point common to all phases in the second period other than the first period.

2. The electronic circuit according to claim 1 ,
wherein the reference signal alternately and periodically includes a peak and a bottom, and
the commutation circuitry selects the voltage commutation for any phase in the first period including time points when the reference signal is at the peak and the bottom.

3. The electronic circuit according to claim 1 ,
wherein the frequency of the reference signal is an integral multiple of 3 of the frequency of the output AC signals.

4. An electronic circuit configured to receive input AC signals having phases different from one another, and to control bidirectional switches corresponding to the phases to generate output AC signals having the phases and having a frequency different from a frequency of the input AC signals, and to output the output AC signals, the electronic circuit comprising:
reference signal circuitry configured to generate a reference signal having a frequency higher than the frequency of the output AC signals; and
commutation circuitry configured to control switching between voltage commutation and current commutation, wherein, in the voltage commutation, the commutation circuitry is configured to switch the bidirectional switches corresponding to the phases in sequence based on a voltage level of the output AC signals of the phases in a first period before and after a time point when an amplitude of the reference signal becomes a specific amplitude value, and in the current commutation, the commutation circuitry is configured to switch the bidirectional switches in parallel based on a current level of the output AC signals of the phases in a second period other than the first period,
wherein the first period or Tvcomm is represented by the following Formula (1) where fR is the frequency of the output AC signals of the bidirectional switches, PFout is a predictive value of a minimum value when an output power factor of the bidirectional switches degrades from 1, and Td is a dead time of the bidirectional switches



cos

-
1

⁡

(

PF

o
⁢
u
⁢
t

)

2
⁢
π
⁢

⁢

f
R



≤

T
vcomm

≤

1

1
⁢
2
⁢

f
R

-

3
⁢

T
d

(
1
)

5. An electronic circuit configured to receive input AC signals having phases different from one another, and to control bidirectional switches corresponding to the phases to generate output AC signals having the phases and having a frequency different from a frequency of the input AC signals, and to output the output AC signals, the electronic circuit comprising:
reference signal circuitry configured to generate a reference signal having a frequency higher than the frequency of the output AC signals; and
commutation circuitry configured to control switching between voltage commutation and current commutation, wherein, in the voltage commutation, the commutation circuitry is configured to switch the bidirectional switches corresponding to the phases in sequence based on a voltage level of the output AC signals of the phases in a first period before and after a time point when an amplitude of the reference signal becomes a specific amplitude value, and in the current commutation, the commutation circuitry is configured to switch the bidirectional switches in parallel based on a current level of the output AC signals of the phases in a second period other than the first period,
input clock circuitry configured to generate an input clock signal having a frequency faster than the frequency of the input AC signals;
first command signal circuitry configured to generate a first command signal to control a current-based virtual PWM rectifier that operates in an equivalent manner to the bidirectional switches;
a first switching function calculator configured to generate a first switching function that indicates on or off of switches inside the current-based virtual PWM rectifier based on the first command signal;
output clock circuitry configured to generate an output clock signal having

Assignees

• Toshiba Kk

Inventors

• Itoh Jun-Ichi
• Kusaka Keisuke
• Takuma Shunsuke
• Yamanokuchi Koki
• Obayashi Shuichi
• Kanekiyo Yasuhiro

Classifications

• H02M5/297

  for conversion of frequency · CPC title

• H02M5/293 Primary

  using semiconductor devices only · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02M7/4807

  having a high frequency intermediate AC stage · CPC title