Power switching circuit, a DC-DC converter including the same and a voltage conversion method

Patent metadata

Field	Value
Publication number	US-11196344-B2
Application number	US-202016788783-A
Country	US
Kind code	B2
Filing date	Feb 12, 2020
Priority date	Jun 11, 2019
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

A direct current (DC)-DC converter including: a power switching circuit including a first switch circuit and a second switch circuit that are connected in parallel to a switching node, the first switch circuit and the second switch circuit configured to generate a switching voltage signal through the switching node in response to an input DC voltage and configured to perform complementary switching operations to control a voltage level of the switching voltage signal; and a filter circuit configured to filter the switching voltage signal to generate an output DC voltage.

First claim

What is claimed is:

1. A direct current (DC)-DC converter, comprising:
a power switching circuit including a first switch circuit and a second switch circuit that are connected in parallel to a switching node, the first switch circuit and the second switch circuit configured to generate a switching voltage signal through the switching node in response to an input DC voltage and configured to perform complementary switching operations to control a voltage level of the switching voltage signal; and
a filter circuit configured to filter the switching voltage signal to generate an output DC voltage,
wherein the first switch circuit includes a first flying capacitor, and the second switch circuit includes a second living, capacitor,
wherein a first equalization switch is connected between a first electrode of the first flying capacitor and a first electrode of the second flying capacitor, and
wherein a second equalization switch is connected between a second electrode of the first flying capacitor and a second electrode of the second living capacitor.

2. The DC-DC converter of claim 1 , wherein, when the first Switch circuit applies a first intermediate voltage to the switching node, the second switch Circuit applies a second intermediate voltage to the switching node at the same time, and
wherein, whet the first switch circuit applies the second intermediate voltage to the switching node, the second switch circuit applies the first intermediate voltage to the switching node at the same time.

3. The DC-DC convener of claim 2 , wherein an average of the first intermediate voltage and the second intermediate voltage corresponds to a half of the input DC voltage.

4. The DC-DC converter of claim 2 , wherein the first intermediate voltage corresponds to a capacitor voltage between the first and second electrodes of each of the first flying capacitor and the second flying capacitor, and the second intermediate voltage corresponds to a difference between the input DC voltage and the capacitor voltage.

5. The DC-DC convener of claim 1 , wherein, during a first operation period, the first switch circuit applies a first intermediate voltage corresponding to a capacitor voltage to the switching node and the second switch circuit applies a second intermediate voltage corresponding to a difference between the input DC voltage and the capacitor voltage to the switching node,
wherein, during a second operation period after the first operation period, the first switch circuit and the second switch circuit apply the input DC voltage or a ground voltage to the switching node,
wherein, during a third operation period after the second operation period, the first switch circuit applies the second intermediate voltage to the switching node and the second switch circuit applies the first intermediate voltage to the switching node, and
wherein, during a fourth operation period after the third operation period, the first switch circuit and the second switch circuit apply the input DC voltage or the ground voltage to the switching node.

6. The DC-DC converter of claim 1 , wherein the first switch circuit includes;
a first switch connected between the input DC voltage and a first node and configured to be turned on in response to a first switch signal;
a second switch connected between the first node and the switching node and configured to be turned on in response to a second switch signal;
a third switch connected between the switching node and a second node and configured to be turned on in response to a third switch signal;
a fourth switch connected between the second node and a ground voltage and configured to be turned on in response to a fourth switch signal; and
the first flying capacitor connected between the first node and the second node, and
wherein the second switch circuit includes:
a fifth switch connected between the input DC voltage and a third node and configured to be turned on in response to a fifth switch signal;
a sixth switch connected between the third node and the switching node grid configured to be turned on in response to a sixth switch signal;
a seventh switch connected between the switching node and a fourth node and configured to be turned on ire response to a seventh switch signal;
an eighth switch connected between the fourth node and the ground voltage and configured to be turned on in response to an eighth switch signal; and
the second flying capacitor co connected between the third node and the fourth node.

7. The DC-DC convener of claim 6 , whet in, when the second itch, the fourth switch, the fifth switch and the seventh switch are turned on, the first switch, the third switch, the sixth switch and the eighth switch are turned off, and
wherein where the first switch, the third switch, the sixth switch and the eighth switch are turned on, the second switch, the fourth switch, the fifth switch and the seventh switch are turned off.

8. The DC-DC converter Of claim 7 , wherein when the third switch, the fourth switch, the seventh switch and the eighth switch are turned on, the first switch, the second switch, the fifth snitch and the sixth switch are turned off, and
wherein, when the first switch, the second switch, the fifth switch and the sixth switch are turned on, the third switch, the fourth switch, the seventh switch and the eighth switch are turned off.

9. The DC-DC converter of claim 6 , wherein, during a first stint operation period, the second switch, the fourth switch, the fifth switch and the seventh switch are turned on,
wherein, during a second operation period, after the first operation period, the third switch, the fourth switch, the seventh switch and the eighth switch are turned on, or the first switch, the second switch, the fifth switch and the sixth switch are turned on,
wherein, during a third operation period after the second operation period, the first switch, the third switch, the sixth switch and the eighth switch are turned on, and
wherein, during a fourth operation period after the third operation period, the third switch, the fourth switch, the seventh switch and the eighth switch are turned on, or the first switch, the second switch, the fifth switch and the sixth switch, are turned on.

10. The DC-DC converter of claim 9 , wherein, when a duty ratio of the first, second, third, fourth, fifth, sixth, seventh and eighth switch signals is greater than 0.5, the third switch, the fourth switch, the seventh switch and the eighth switch are turned on during the second operation period and the fourth operation period, and
wherein, when the duty ratio of the first, second, third, fourth, fifth, sixth, seventh and eight switch signals is smaller than 0.5, the first switch, the second switch, the fifth switch and the sixth switch are turned on during the second operation period and the fourth operation period.

11. The DC-DC converter of claim 6 , wherein the first switch, the second switch, the fifth switch and the sixth switch are P-channel metal oxide semiconductor (PMOS) transistors, and
wherein the third switch, the fourth switch, the seventh switch and the eighth switch are N-channel metal oxide semiconductor (NMOS) transistors.

12. The DC-DC converter of claim 6 , wherein the first switch signal, the fourth switch signal, sixth switch signal and the seventh switch signal are activated simultaneously, and
wherein the second switch signal, the third switch signal, fifth switch signal and the eighth switch signal are activated simultaneously.

13. The DC-DC converter of claim 6 , wherein each of the third switch signal, the fourth switch signal, the seventh switch signal and the eighth switch signal

Assignees

• Samsung Electronics Co Ltd
• Univ Korea Res & Bus Found

Inventors

• Yoo Sungmin
• Lee Hyungmin
• Kong Taehwang
• Kim Sangho
• Shin Seun
• Yang Junhyeok
• Jung Woojoong

Classifications

• H02M7/4833

  Capacitor voltage balancing · CPC title

• H02M3/1584 Primary

  with a plurality of power processing stages connected in parallel · CPC title

• H02M3/07

  using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} · CPC title

• H02M1/14

  Arrangements for reducing ripples from DC input or output · CPC title

• H02M1/0064

  Magnetic structures combining different functions, e.g. storage, filtering or transformation · CPC title