Abstract: Provided is an input device using a touch manner. A micro computer and a key control unit perform communications in a serial method to obtain operation stability by reducing the number of data connecting ports between the micro computer and the key control unit. Furthermore, when more than two sets of key matrixes are provided, a plurality of key control unit may be connected to one micro computer to solve interferences between the key patterns. Moreover, operational reliability of the input device using the touch manner is improved by adequately using resources of the key control unit and at the same time reducing processing load of the micro computer.

Abstract: Provided are an apparatus and a method for monitoring a hot surface of a cook top. The apparatus includes a display unit, a temperature detecting sensor, and a microprocessor. The display unit displays a state of a hot surface and an operation error of a hot plate as a heater operates. The temperature detecting sensor is installed closely to the heater to detect heater temperature greater than set temperature. The microprocessor compares the heater temperature greater than the set temperature that is detected by the temperature detecting sensor with heater temperature greater than the set temperature that is expected by an elapse of an operating time of the heater to judge one of a hot surface and an operation error of the hot plate, and controls the judgment results to be displayed using the display unit.

Abstract: A temperature sensing circuit and a method of automatically controlling the temperature sensing circuit in a cooking apparatus for more accuracy are provided. In the method, the low temperature table and the high temperature table are selectively used based on a current temperature of a cooking chamber, when cooking is ended. The low temperature table and the high temperature table are selectively used based on preset cooking temperatures for different types of cooking together with a current temperature of the cooking chamber, while cooking is performed.

Abstract: Provided is an input device using a touch manner. A micro computer and a key control unit perform communications in a serial method to obtain operation stability by reducing the number of data connecting ports between the micro computer and the key control unit. Furthermore, when more than two sets of key matrixes are provided, a plurality of key control unit may be connected to one micro computer to solve interferences between the key patterns. Moreover, operational reliability of the input device using the touch manner is improved by adequately using resources of the key control unit and at the same time reducing processing load of the micro computer.

Abstract: The present invention relates to a combined toaster and microwave oven that can obtain uniformly toasted slices of bread even when the slices of the bread are toasted successively several times. The combined toaster and microwave oven includes a key input unit for selecting user's favorite kind of the bread and baking level, a memory for storing heating time of the heaters according to the favorite kind of the bread and the favorite baking level, a temperature sensor for sensing internal temperature of the toaster, a controller for counting an elapsed time for the heaters to operate after the heaters stop and adjusting the heating time of the heaters according to the counted time and the internal temperature of the sensor.

Abstract: An apparatus for generating a microwave frequency energy includes a cathode for emitting electrons, a first grid for controlling and focusing the flow of electrons from the cathode, a choke structure for serving as a capacitor, wherein the cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit.

Abstract: A microwave oven includes a microwave generating apparatus having a cathode, a first grid for controlling the flow of electrons from the cathode, the first grid having holes for converting electrons from the cathode to the electron beams, a choke structure, positioned between the cathode and the first grid, for serving as a blocking capacitor, wherein the cathode, the first grid and the choke structure define an input cavity functioning as a resonant circuit, an array of resistors, one end of which is connected to the first grid and the other end thereof is connected to the cathode, for inducing a bias voltage on the first grid, a controller for controlling the array of resistors to make a plurality of resistance values, a second grid provided above the first grid and having holes through which the electron beams passing through holes of the first grid pass, an anode for receiving the electrons passing through the holes of the second grid, wherein the second grid and the anode define an output cavity for gene