Rectifier having reduced switching loss

• US 9,929,672 B2
• Filed: 02/11/2016
• Issued: 03/27/2018
• Est. Priority Date: 05/28/2015
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group), SungKyunKwan University's Research & Business Foundation (SungKyunKwan University (SKKU))
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group), SungKyunKwan University's Research & Business Foundation (SungKyunKwan University (SKKU))
• Inventors: Kang, Chang Soo, Park, Chul Gyun, Lee, Kang Yoon, Chun, Joo Young
• Primary Examiner(s): LEE III, HENRY E
• Application Number:
  US15/041,096
• Publication Number:
  US 20160352248A1
• Time in Patent Office: 775 Days
• CPC Class Codes: H02M 7/219 in a bridge configuration
• CPC Class Codes: H02M 7/2195 the switches being synchronously commutated at the same frequency of the AC input voltage
• CPC Class Codes: H03K 17/161 in field-effect transistor switches
• CPC Class Codes: H03K 2217/0045 Full bridges, determining the direction of the current through the load
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A rectifier includes: first and second high side switches including source terminals connected to an alternating current input terminal and drain terminals connected to one end of an output capacitor; first and second low side switches including drain terminals connected to the alternating current input terminal and source terminals connected to a ground terminal and another end of the output capacitor; and a cross connector configured to allow parasitic capacitance of the first high side switch or the second high side switch to flow to a ground when the first high side switch or the second high side switch is turned off.

Claims

1. A rectifier comprising:

first and second high side switches comprising source terminals connected to an alternating current input terminal and drain terminals connected to one end of an output capacitor;

first and second low side switches comprising drain terminals connected to the alternating current input terminal and source terminals connected to a ground terminal and another end of the output capacitor; and

a cross connector configured to allow parasitic capacitance of the first high side switch or the second high side switch to flow to a ground when the first high side switch or the second high side switch is turned off, wherein the cross connector comprises

a first cross switch comprising a gate terminal connected to a gate of the first high side switch and a drain terminal connected to a gate of the second high side switch, and

a second cross switch comprising a gate terminal connected to the gate of the second high side switch and a drain terminal connected to the gate of the first high side switch.

2. The rectifier of claim 1, wherein the first and second cross switches comprise source terminals connected to the ground terminal.

3. The rectifier of claim 1, wherein the first and second high side switches are configured to operate alternately according to a change in polarities of input alternating current voltages.

4. The rectifier of claim 3, wherein the first low side switch and the second low side switch are configured to perform switching operations in correspondence with the second high side switch and the first high side switch, respectively.

5. The rectifier of claim 4, wherein the first cross switch and the second cross switch are configured to perform switching operations in correspondence with the first high side switch and the second high side switch, respectively.

6. A rectifier comprising:

first and second high side switches comprising source terminals connected to an alternating current input terminal and drain terminals connected to one end of an output capacitor;

first and second low side switches comprising drain terminals connected to the alternating current input terminal and source terminals connected to a ground terminal and another end of the output capacitor;

a cross connector configured to allow parasitic capacitance of the first high side switch or the second high side switch to flow to a ground when the first high side switch or the second high side switch is turned off; and

first and second level shifters respectively connected to gate terminals of the first and second high side switches,

wherein the cross connector comprises

a first cross switch comprising a gate terminal connected to a gate of the first high side switch and a drain terminal connected to a gate of the second high side switch, and

a second cross switch comprising a gate terminal connected to the gate of the second high side switch and a drain terminal connected to the gate of the first high side switch.

7. The rectifier of claim 6, wherein the first and second level shifters are configured to respectively adjust gate voltages of the first and second high side switches such that gate-source voltages of the first and second high side switches are uniform.

8. The rectifier claim 6, wherein the first and second cross switches comprise source terminals connected to the ground terminal.

9. The rectifier of claim 6, wherein the first and second high side switches are configured to operate alternately according to a change in polarities of input alternating current voltages.

10. The rectifier of claim 9, wherein the first low side switch and the second low side switch are configured to perform switching operations in correspondence with the second high side switch and the first high side switch, respectively.

11. The rectifier of claim 10, wherein the first cross switch and the second cross switch are configured to perform switching operations in correspondence with the first high side switch and the second high side switch, respectively.

12. A rectifier comprising:

first and second high side switches comprising source terminals connected to an alternating current input terminal and drain terminals connected to one end of an output capacitor;

first and second low side switches comprising drain terminals connected to the alternating current input terminal and source terminals connected to a ground terminal and another end of the output capacitor;

a first cross switch comprising a gate terminal connected to a gate of the first high side switch and a drain terminal connected to a gate of the second high side switch; and

a second cross switch comprising a gate terminal connected to the gate of the second high side switch and a drain terminal connected to the gate of the first high side switch.

13. The rectifier of claim 12, wherein:

the first cross switch is configured to allow parasitic capacitance in the second high side switch to flow to a ground through the first cross switch; and

the second cross switch is configured to allow parasitic capacitance in the first high side switch to flow to a ground through the second cross switch.

14. The rectifier of claim 12, further comprising level shifters connected to gate terminals of the first and second high side switches and configured to adjust gate voltages of the first and second high side switches such that gate-source voltages of the first and second high side switches are uniform.

15. A rectifier comprising:

first and second high side switches comprising source terminals connected to an alternating current input terminal and drain terminals connected to one end of an output capacitor;

first and second low side switches comprising drain terminals connected to the alternating current input terminal and source terminals connected to a ground terminal and another end of the output capacitor;

a first cross switch connected to the first high side switch and the second high side switch, and configured to allow parasitic capacitance of the second high side switch to flow to a ground through the first cross switch; and

a second cross switch connected to the first high side switch and the second high side switch, and configured to allow parasitic capacitance of the first high side switch to flow to the ground through the second cross switch.