Microwave oven
First Claim
Patent Images
1. A microwave oven comprising:
- a magnetron filter box having a magnetron, at least one first choke coil, and a feed-through condenser installed therein; and
at least one second choke coil arranged outside the magnetron filter box and connected in series to the first choke coil, wherein the second choke coil, together with the feed-through condenser, constitute a low pass filter.
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Abstract
A microwave oven using DC power which can endure strong vibrations and eliminate noise according to noise standards. The microwave oven includes at least one second choke coil which is arranged outside a magnetron filter box and connected in series to at least one first choke coil installed in the magnetron filter box. Each choke coil and a feed-through condenser constitute a low pass filter. The size of each of the first choke coil is reduced and the size of each of the second choke coil is increased, so as to endure the strong vibrations and eliminate the noise generated by a driving of a magnetron.
16 Citations
25 Claims
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1. A microwave oven comprising:
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a magnetron filter box having a magnetron, at least one first choke coil, and a feed-through condenser installed therein; and
at least one second choke coil arranged outside the magnetron filter box and connected in series to the first choke coil, wherein the second choke coil, together with the feed-through condenser, constitute a low pass filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
another first choke coil and a second feed-through condenser installed in the magnetron filter box; and
another second choke coil arranged outside the magnetron filter box and connected in series to the another first choke coil, wherein the another second choke coil, together with the second feed-through condenser, constitute another low pass filter.
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9. The microwave oven according to claim 8, further comprising:
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a switching unit which selectively blocks direct current (DC) power;
an inverter unit which converts the DC power to alternating current (AC) power;
a high voltage transformer which induces a high voltage and heats the magnetron; and
a magnetron driving unit which supplies the high voltage to the magnetron.
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10. The microwave oven according to claim 9, further comprising diodes, each having an anode and a cathode, connected in parallel to the high voltage transformer, wherein the anodes and one of the second choke coils are connected to a heater coil of the high voltage transformer, and the cathodes are connected to the other second choke coil.
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11. A microwave oven comprising:
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a magnetron filter box having a magnetron, first choke coils and feed-through condensers; and
second choke coils arranged outside the magnetron filter box and connected in series to the corresponding first choke coils, wherein the first and second choke coils, together with the feed-through condensers, constitute corresponding low pass filters. - View Dependent Claims (12, 13, 14, 15, 16, 17)
a high voltage transformer which induces a high voltage and includes a heater coil which heats the magnetron; and
diodes, each having an anode and a cathode, connected in parallel to the high voltage transformer, wherein the anodes and one of the second choke coils are connected to the heater coil, and the cathodes are connected to another one of the second choke coils.
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13. The microwave oven according to claim 11, wherein the first choke coils comprise corresponding inductances smaller than that of the second choke coils.
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14. The microwave oven according to claim 11, wherein the first and second choke coils include corresponding first and second ferrite cores inserted therein, wherein weights of the first and second ferrite cores are proportional to the corresponding inductances of the first and second choke coils.
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15. The microwave oven according to claim 14, wherein the inductances of the first and second choke coils, as combined, equal to a total inductance which is set according to frequencies of noise signals to be eliminated.
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16. The microwave oven according to claim 15, wherein the first and second choke coils eliminate noise generated by a driving of the magnetron to a desired noise standard and satisfy vibration standards applied to microwave ovens usable with the DC power as a power source.
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17. The microwave oven according to claim 16, wherein the microwave oven is a microwave oven usable with a power source selected from DC and AC power sources.
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18. A microwave oven comprising:
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a magnetron filter box having a magnetron and a feed-through condenser; and
choke coils which are installed inside and outside of the magnetron filter box so as to eliminate noise generated by a driving of the magnetron and satisfy vibration standards applied to microwave ovens usable with direct current (DC) power as a power source. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification