MICROWAVE HEATING DEVICE AND MICROWAVE HEATING CONTROL METHOD
First Claim
1. A microwave heating device comprising:
- a microwave generating portion having a variable frequency function;
a heating chamber for housing an object to be heated;
plural feeding portions for supplying, to the heating chamber, a microwave generated from the microwave generating portion;
an electric-power detection portion for detecting an amount of reflected microwaves which are reflected toward the microwave generating portion from the heating chamber through the feeding portions; and
a control portion for controlling an operation of the microwave generating portion on the basis of a detection signal detected by the electric-power detection portion;
whereinthe control portion is configured to perform control for operating the microwave generating portion at a heating frequency for heating the object to be heated for supplying the microwave electric power from the feeding potions to the heating chamber, estimate a heating state of the object to be heated on the basis of a per-unit-time increase/decrease change state in a detected level of a detection signal detected by the electric-power detection portion, and control the heating frequency and the microwave electric power supplied from the feeding portions to the heating chamber.
3 Assignments
0 Petitions
Accused Products
Abstract
In order to provide a microwave heating device and a microwave heating control method which are capable of uniformly heating a to-be-heated object in a desired state, by employing plural feeding portions provided in a heating chamber on the basis of information about reflected electric power from the respective feeding portions; a control portion controls to supply microwave electric power from plural feeding portions to a heating chamber by operating a microwave generating portion at a heating frequency for heating a to-be-heated object, estimates a heating state for the to-be-heated object on the basis of per-unit-time increase/decrease change states of detected levels of detection signals detected by electric-power detection portions, and controls the heating frequency and the microwave electric power supplied from the feeding portions to the heating chamber.
-
Citations
17 Claims
-
1. A microwave heating device comprising:
-
a microwave generating portion having a variable frequency function; a heating chamber for housing an object to be heated; plural feeding portions for supplying, to the heating chamber, a microwave generated from the microwave generating portion; an electric-power detection portion for detecting an amount of reflected microwaves which are reflected toward the microwave generating portion from the heating chamber through the feeding portions; and a control portion for controlling an operation of the microwave generating portion on the basis of a detection signal detected by the electric-power detection portion;
whereinthe control portion is configured to perform control for operating the microwave generating portion at a heating frequency for heating the object to be heated for supplying the microwave electric power from the feeding potions to the heating chamber, estimate a heating state of the object to be heated on the basis of a per-unit-time increase/decrease change state in a detected level of a detection signal detected by the electric-power detection portion, and control the heating frequency and the microwave electric power supplied from the feeding portions to the heating chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A microwave heating control method comprising steps of:
-
performing a sweeping operation over a predetermined frequency range, and detecting an amount of reflected microwaves reflected toward a microwave generating portion from a heating chamber through plural feeding portions, prior to start of an actual heating operation on an object to be heated housed in the heating chamber; selecting, as a heating frequency, an oscillating frequency at which a detected level of a total sum of detected amounts of reflected microwaves has a minimum value; and estimating a heating state of the object to be heated on the basis of a per-unit-time increase/decrease change state of a detected level of an amount of reflected microwaves, and controlling the heating frequency and the microwave electric power supplied to the heating chamber from the feeding portions, in a state where microwave electric power is supplied from the feeding portions to the heating chamber at the selected frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
Specification