Circuit, fan system, and transformer for power conversion

Patent metadata

Field	Value
Publication number	US-12438467-B2
Application number	US-202318390908-A
Country	US
Kind code	B2
Filing date	Dec 20, 2023
Priority date	Dec 30, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

Disclosed are a circuit, a fan system, and a transformer for power conversion. The circuit for power conversion includes: a voltage input terminal including a positive input terminal and a negative input terminal; a transformer, a first end of the primary side of the transformer being coupled to the positive input terminal and a second end thereof being coupled to the negative input terminal; a switch, a first end of which being coupled to the negative input terminal and a second end of which being coupled to the second end of the primary side; a first output terminal; and a secondary-side rectifier module coupled between the secondary side of the transformer and the first output terminal, for outputting, at the first output terminal, an output signal with superimposed direct current and alternating current.

First claim

The invention claimed is:

1. A circuit for power conversion, comprising:
a voltage input terminal comprising a positive input terminal and a negative input terminal;
a transformer comprising a primary side and a secondary side, wherein a first end of the primary side is coupled to the positive input terminal and a second end of the primary side being coupled to the negative input terminal;
a switch having a first end and a second end, wherein the first end of the switch is coupled to the negative input terminal and the second end of the switch is coupled to the second end of the primary side;
a first output terminal; and
a secondary-side rectifier module coupled between the secondary side of the transformer and the first output terminal, wherein the secondary-side rectifier module is configured to output, at the first output terminal, an output signal with superimposed direct current and alternating current.

2. The circuit as claimed in claim 1 , wherein the secondary-side rectifier module comprises a voltage-doubling rectifier circuit comprising a plurality of diodes and a plurality of capacitors for generating the output signal.

3. The circuit as claimed in claim 2 , wherein the plurality of capacitors and the plurality of diodes are alternately connected in series to one another, and adjacent diodes of the plurality of diodes are coupled between two ends of the secondary side in a polarity reversal manner.

4. The circuit as claimed in claim 3 , wherein a first end of a first diode of the plurality of diodes is coupled to a first end of the secondary side through a first capacitor of the plurality of capacitors, and a second end of a last diode of the plurality of diodes is coupled to the first output terminal.

5. The circuit as claimed in claim 4 , wherein a second end of the first diode is coupled to a third output terminal.

6. The circuit as claimed in claim 5 , further comprising:
an additional capacitor, wherein a first end of the additional capacitor is coupled to the positive input terminal or the negative input terminal, and a second end of the additional capacitor is coupled to a second end of the first diode.

7. The circuit as claimed in claim 2 , wherein the voltage-doubling rectifier circuit further comprises a plurality of inductors, each of the plurality of inductors being coupled between a corresponding capacitor and a corresponding diode in the voltage-doubling rectifier circuit by being spaced with a group of capacitors and diodes.

8. The circuit as claimed in claim 4 , further comprising:
a voltage feedback module coupled between a first end of the last diode and ground.

9. The circuit as claimed in claim 4 , wherein the first end of the first diode is an anode and the second end of the last diode is a cathode, and wherein the circuit is configured to output, at the first output terminal, an output signal with superimposed negative direct current and alternating current.

10. The circuit as claimed in claim 4 , wherein the first end of the first diode is a cathode and the second end of the last diode is an anode, and wherein the circuit is configured to output, at the first output terminal, an output signal with superimposed positive direct current and alternating current.

11. The circuit as claimed in claim 4 , further comprising:
a second output terminal, wherein the second output terminal is coupled to a first end of the last diode, wherein the secondary-side rectifier module is configured to output, at the second output terminal, another output signal comprising only the direct current among the direct current and the alternating current output from the first output terminal.

12. The circuit as claimed in claim 5 , further comprising:
a current detection module coupled between a second end of the first diode and ground or between the second end of the first diode and an output terminal of the voltage-doubling rectifier circuit.

13. The circuit as claimed in claim 1 , wherein the switch is a silicon carbide metal-oxide-silicon field-effect transistor, and
wherein the circuit further comprises an additional diode, wherein an anode of the additional diode is coupled to the second end of the primary side, and a cathode of the additional diode is coupled to a drain of the silicon carbide metal-oxide-silicon field-effect transistor.

14. The circuit as claimed in claim 1 , further comprising:
a resistor-capacitor-diode (RCD) absorption circuit on the primary side.

15. The circuit as claimed in claim 1 , wherein the direct current has a voltage greater than 1000 volts, and the alternating current has a frequency greater than 10 KHz.

16. The circuit as claimed in claim 1 , wherein the transformer comprises:
a core;
a primary coil wound around the core;
an electrical insulating skeleton provided with a plurality of grooves in a direction perpendicular to an axis of the core; and
secondary coils sequentially wound in series in each of the plurality of grooves.

17. A fan system, comprising:
a gas inlet portion configured to introduce an external gas;
a plasma generation device, which is configured to generate plasma and an electric field for driving the plasma to make a directional movement, such that the external gas introduced from the gas inlet portion makes a directional movement following the plasma, wherein the plasma generation device is configured to be driven by a circuit, or the plasma generation device is configured to receive an output signal with superimposed direct current and alternating current output by the circuit; and
a gas purifying unit, which is configured to purify the external gas passing through the plasma generation device to reduce a concentration of ozone ions in the external gas.

18. The fan system as claimed in claim 17 , wherein the gas purifying unit has a metal surface or a ceramic surface, wherein the gas purifying unit comprises a catalyst for purifying the external gas, and wherein the catalyst is a catalyst for eliminating ozone.

19. The fan system as claimed in claim 17 , wherein the circuit comprises:
a voltage input terminal comprising a positive input terminal and a negative input terminal;
a transformer comprising a primary side and a secondary side, wherein a first end of the primary side is coupled to the positive input terminal and a second end of the primary side being coupled to the negative input terminal;
a switch having a first end and a second end, wherein the first end of the switch is coupled to the negative input terminal and the second end of the switch is coupled to the second end of the primary side;
a first output terminal; and
a secondary-side rectifier module coupled between the secondary side of the transformer and the first output terminal, wherein the secondary-side rectifier module is configured to output, at the first output terminal, the output signal with the superimposed direct current and alternating current.

20. A transformer, comprising:
a core;
a primary coil wound around the core;
an electrical insulating skeleton provided with a plurality of grooves in a direction perpendicular to an axis of the core; and
secondary coils sequentially wound in series in each of the plurality of grooves.

21. The transformer as claimed in claim 20 , wherein the electrical insulating skeleton comprises two symmetrical structures, which are combined to form the electrical insulating skeleton through clamping structures that mate with each other, thereby tightly surrounding the primary coil.

Assignees

• Infineon Technologies Austria Ag

Inventors

• Xu Kuiwei

Classifications

• H01J37/32844

  Treating effluent gases · CPC title

• A61L9/22

  Ionisation · CPC title

• B01D2258/06

  Polluted air · CPC title

• B01D2257/106

  Ozone · CPC title

• B01D2251/104

  Ozone · CPC title