Resonant inverter and resonant power source unit

Patent metadata

Field	Value
Publication number	US-2016352235-A1
Application number	US-201615153092-A
Country	US
Kind code	A1
Filing date	May 12, 2016
Priority date	May 12, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A resonant inverter is provided that includes a first switch and a second switch alternately turned on and off, a first inverter including the first switch and a first resonant circuit including a first coil and a first capacitor, and a second inverter including the second switch and a second resonant circuit including a second coil and a second capacitor. The first coil, the second coil, and a third capacitor constitute a third resonant circuit.

First claim

1 . A resonant inverter comprising:
a first switch and a second switch alternately turned on and off; a first inverter including the first switch and a first resonant circuit including a first coil and a first capacitor; and a second inverter including the second switch and a second resonant circuit including a second coil and a second capacitor, wherein the first coil, the second coil, and a third capacitor constitute a third resonant circuit.

2 . The resonant inverter according to claim 1 ,
wherein the first capacitor is connected in parallel to the first switch, the second capacitor is connected in parallel to the second switch, the first coil is provided between the first switch and a first input terminal, the second coil is provided between the second switch and the first input terminal, and the third capacitor is provided between the first switch and the second switch, and connected in parallel to the first coil and the second coil connected in series to each other.

3 . The resonant inverter according to claim 1 , further comprising a fourth capacitor and a third coil provided between the first switch and the second switch, and constituting a fourth resonant circuit.

4 . The resonant inverter according to claim 1 , further comprising a fifth resonant circuit including a fifth coil provided parallel to the first switch and a fifth capacitor, the fifth coil and the fifth capacitor being connected in series, and a sixth resonant circuit including a sixth coil provided parallel to the second switch and a sixth capacitor, the sixth coil and the sixth capacitor being connected in series.

5 . A resonant inverter comprising:
a first switch and a second switch alternately turned on and off, and a transformer including a first winding and a second winding on a primary side; a first inverter including the first switch and a first resonant circuit including a first coil and a first capacitor; and a second inverter including the second switch and a second resonant circuit including a second coil and a second capacitor, wherein the first coil, the second coil, and a third capacitor constitute a third resonant circuit.

6 . The resonant inverter according to claim 5 ,
wherein the first capacitor is connected in parallel to the first switch, the second capacitor is connected in parallel to the second switch, the first coil is connected to the first switch and one end of the first winding of the transformer, the second coil is connected to the second switch and one end of the second winding of the transformer, and the third capacitor is provided between the first switch and the second switch.

7 . The resonant inverter according to claim 5 , further comprising a fourth capacitor and a third coil provided between the first switch and the second switch and constituting a fourth resonant circuit.

8 . The resonant inverter according to claim 5 , further comprising a fifth resonant circuit including a fifth coil provided parallel to the first switch and a fifth capacitor, the fifth coil and the fifth capacitor being connected in series, and a sixth resonant circuit including a sixth coil provided parallel to the second switch and a sixth capacitor, the sixth coil and the sixth capacitor being connected in series.

9 . The resonant inverter according to claim 5 , further comprising a seventh resonant circuit including the first coil, the second coil, the first winding of the transformer, the second winding of the transformer, and the third capacitor.

10 . The resonant inverter according to claim 5 ,
wherein the first coil and the second coil is constituted of leakage inductance of the transformer.

11 . The resonant inverter according to claim 5 , wherein a center tap provided between the first winding and the second winding of the transformer is connected to an input terminal to which an input voltage is applied.

12 . The resonant inverter according to claim 1 ,
wherein a capacitance Cf of the third capacitor satisfies an equation ( 1 ), where Lf denotes inductance of the first coil and the second coil, and Fs denotes a driving frequency of the switch:

1

4


π
2


2




L
f



(

2




F
s

)

2

≤

C
f

≤

1

4


π
2


2




L
f



(

3




F
s

)

2

(
1
)

13 . The resonant inverter according to claim 1 ,
wherein each of the first capacitor, the second capacitor, and the third capacitor is a variable capacitor.

14 . A resonant power source unit comprising:
the resonant inverter according to claim 1 ; and a resonant rectifier connected to the resonant inverter.

15 . A resonant power source unit comprising:
the resonant inv

Assignees

• Tdk Corp

Inventors

• Imai Katsunori

Classifications

• H02M3/33546 Primary

  with automatic control of the output voltage or current (H02M3/33561 takes precedence) · CPC title

• H02M3/33569 Primary

  having several active switching elements (H02M3/3353 takes precedence) · CPC title

• H02M3/015

  with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuit · CPC title

• H02M3/01

  Resonant DC/DC converters · CPC title

• H02M1/0058

  by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826) · CPC title