DC voltage microwave oven power supplying circuit

• US 7,034,267 B2
• Filed: 01/27/2005
• Issued: 04/25/2006
• Est. Priority Date: 04/04/2002
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Wan Soo, Han, Sung Jin
• Primary Examiner(s): Leung, Philip H.
• Application Number:
  US11/043,148
• Publication Number:
  US 20050121443A1
• Time in Patent Office: 453 Days
• Field of Search: 219715-718, 219/702, 219/721, 363/17, 363/21, 363/98
• US Class Current: 219/715
• CPC Class Codes: H05B 6/683 the measurements being made at the high voltage side of the circuit
• CPC Class Codes: H05B 6/80 Apparatus for specific applications stoves or ranges F24C7/02
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

Circuit for operating a microwave oven including a DC voltage source, a switching part having at least two switching devices electrically connected to the DC voltage source for switching a voltage from the DC voltage source, controlling part for controlling the switching part, a magnetron for generating a microwave, and a converting part for converting the voltage from the DC voltage source to a voltage for operating the magnetron by switching of the switching part, thereby permitting operation of the microwave oven by using a car battery.

Claims

1. A circuit for operating a microwave oven comprising:

a DC voltage source;

a first capacitor and a second capacitor connected in series, a combination of the first capacitor and a second capacitor being connected to the DC voltage source in parallel, a first node being between the first capacitor and the second capacitor in the combination of the first capacitor and the second capacitor;

a switching part having a first and a second switching devices electrically connected to the DC voltage for switching a voltage from the DC voltage source, the first switching device and the second switching device being connected in series;

a controlling part for controlling the first, and second switching devices;

a magnetron for generating a microwave; and

a converting part for converting the voltage from the DC voltage source to a voltage for operating the magnetron, the converting part having a first terminal and a second terminal, the first terminal being connected to a second node connecting both of the first and second switching devices, the second terminal being connected to the first node, the second terminal and the first node having a substantially equal electric potential, the second terminal being connected to an anode of the DC voltage source via the first capacitor and connected to a cathode of the DC voltage source via the second capacitor.

2. The circuit as claimed in claim 1, wherein the DC voltage source is a car battery source.

3. The circuit as claimed in claim 1, wherein each of the first and second switching devices includes an MOSFET, a diode and a capacitor connected in parallel.

4. The circuit as claimed in claim 3, wherein each of the first and second switching devices includes one of a serial resonant half-wave voltage doubler rectifier circuit and a serial resonant full wave rectifier circuit.

5. The circuit as claimed in claim 1, wherein the converting part is a transformer.

6. A circuit for operating a microwave oven comprising:

a DC voltage source having an anode and a cathode;

a first capacitor and a second capacitor connected in series, a combination of the first capacitor and a second capacitor being connected to the DC voltage source in parallel, a node being between the first capacitor and the second capacitor in the combination of the first capacitor and the second capacitor;

a switching part having at least a first and a second switching devices electrically connected to the DC voltage source for switching a voltage from the DC voltage source, the first switching device having a first terminal and a second terminal, the second switching device having a third terminal and a fourth terminal, the second terminal and the third terminal being connected, the first terminal being connected to the anode of the DC voltage source, the fourth terminal being connected to the cathode of the DC voltage source;

a controlling part for controlling the switching part;

a magnetron for generating a microwave; and

a converting part for converting the voltage from the DC voltage source to a voltage for operating the magnetron, the converting part having a fifth terminal and a sixth terminal, the fifth terminal being connected to the second terminal and the third terminal, the sixth terminal being connected to the node, the sixth terminal and the node having a substantially equal electric potential, the sixth terminal being connected to the anode of the DC voltage source via the first capacitor and connected to the cathode of the DC voltage source via the second capacitor.

7. The circuit as claimed in claim 6, wherein the DC voltage source is a car battery source.

8. The circuit as claimed in claim 6, wherein each of the first and the second switching devices includes an MOSFET, a diode and a capacitor connected in parallel.

9. The circuit as claimed in claim 8, wherein each of the first and second switching devices includes one of a serial resonant half-wave voltage doubler rectifier circuit and a serial resonant full wave rectifier circuit.

10. The circuit as claimed in claim 6, wherein the converting part is a transformer.