JP3389425B2 - High frequency heating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating apparatus for controlling heating based on the weight of a food to be heated. 2. Description of the Related Art Conventionally, in a high-frequency heating apparatus for controlling heating according to the weight of a food to be heated on a turntable, for example, uneven distribution of the food to be heated is performed so that the weight can be detected stably. In order not to be adversely affected by the above, the microcomputer rotates the turntable motor, performs sampling of a plurality of weight signals, and calculates and calculates a more accurate amount in the meantime. In order to accurately measure the quantity of the food to be heated, the microcomputer obtains a value (reference value) of zero relative weight when the turntable is rotated without the food to be heated. This was stored in a non-volatile memory element and used as a reference value when actually weighing the food to be heated. In such a case, the microcomputer stores the reference value in the nonvolatile memory element immediately after outputting a signal for stopping the turntable motor (signal for turning off the drive relay). [0005] However, even if the microcomputer outputs a signal for turning off the relay for driving the turntable motor, the operation time of the relay drive circuit and the time required for the relay to turn off are required. Time, and
Since there is a time required for the turntable motor to be reliably turned off after the relay is turned off, when the microcomputer outputs a signal to the nonvolatile memory element immediately after outputting the relay off signal to the relay drive circuit, this signal is output. Turntable motor is turned off while output
F may cause chattering noise of the relay and noise when the turntable motor is turned off.
The transmission signal between the microcomputer and the nonvolatile memory element is adversely affected, and the signal data itself may be destroyed, or the data stored in the nonvolatile memory element may be destroyed. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a turntable motor for rotating a turntable, and measuring the weight of a food to be heated including the turntable. A weight sensor attached to the turntable motor, a non-volatile memory element for storing information based on the signal of the weight sensor, and a turntable without placing the food to be heated on the turntable. The turntable is rotated by a predetermined amount by driving the table motor, and a plurality of signals sampled through the weight sensor are calculated in the meantime to obtain a reference value of zero relative weight, and the obtained value is transferred to the nonvolatile memory element. Microcomputer that starts storage after a specified time has elapsed after stopping the drive of the turntable motor And a high-frequency heating device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In measuring a reference value when a food to be heated is not placed on a turntable, that is, when a so-called relative weight is zero, and storing the reference value in a nonvolatile memory element, a microcomputer is used. A turntable motor is driven to rotate the turntable by a predetermined amount, and a plurality of signals sampled through the weight sensor are calculated during the turn to calculate a reference value of zero relative weight, and the obtained value is used as a nonvolatile memory element. To store. The storage is started at a point in time when a specified time has elapsed after the drive of the turntable motor is stopped. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of one embodiment of the present invention, and FIG. 2 is a timing chart of data communication between a microcomputer and a nonvolatile memory element. In FIG. 1, reference numeral 1 denotes a turntable motor for driving a turntable for placing a food to be heated, and 2 denotes a turntable motor attached to the turntable motor 1 and specifically connected to a rotating shaft of the motor. Then, the weight sensor is responsive to the weight of the turntable transmitted through the shaft and the weight of the food to be heated on the turntable and outputs a signal relating to the weight. In this embodiment, in order to perform weight detection using a rotation mechanism and to overcome a measurement problem when food is unevenly placed on the turntable, in this embodiment, the turntable rotates one turn. While the drive of the turntable motor 1 is controlled, the output of the weight sensor is collected a plurality of times so that weight information with high availability can be obtained. Reference numeral 3 denotes a drive power supply for the turntable motor 1, and reference numeral 4 denotes a relay for controlling connection of the drive power supply 3 to the turntable motor 1. Reference numeral 5 denotes a nonvolatile memory element such as an EEPROM or a flash memory element for storing information obtained based on a signal from the weight sensor 2, that is, a reference value of zero relative weight, which will be described later. A microcomputer that controls a high-frequency heating device including a high-frequency energy generating device (not shown) based on the weight sensor 2 (in consideration of the above-described reference value, the weight of the food on the turntable) during normal cooking. Upon detection, the required heating time is calculated according to the detected value, and the relay 4 (for controlling the drive of the turntable motor 1) and other elements are controlled based on the calculated time. In measuring the weight of food, the so-called relative weight in the absence of food on the turntable Weight when is zero (reference value)
In this embodiment, when the reference value is stored in the nonvolatile memory element 5, the following is performed. That is, the microcomputer 6
Is with no food on the turntable,
The turntable motor 1 is driven to rotate the turntable by a predetermined amount (one rotation). During this time, a plurality of signals sampled through the weight sensor are calculated to determine a reference value of zero relative weight. The data is stored in the nonvolatile memory element 5. In addition, the storage is started at a point in time when a predetermined time has elapsed after the drive of the turntable motor 1 is stopped. FIG. 2 is a diagram for explaining the timing of storing the reference value information in the nonvolatile memory element 5.
During the operation of the turntable motor 1 while the relay 4 is being driven, data is fetched through the weight sensor 2, and during and after the stop of the operation of the relay 4, a specified time given by a timer (not shown) (actual problem) Even if the microcomputer 6 stops driving the relay 4, the actual stoppage of the relay 4 and the turntable motor 1 is slightly delayed thereafter, and during the delay, harmful noise may be generated from both. Is not negligible, the storage of the determined reference value in the non-volatile memory element 5 does not start until the elapsed time has elapsed, and the standby state is maintained. Then, after the specified time has elapsed, the communication function is turned on to start the storing operation. With this configuration, the nonvolatile memory element 5
Since the reference value stored in the storage is no longer exposed to harmful noise, it is accurately stored without being destroyed, so that automatic control of heating based on food weight can always be performed with high precision Became. According to the present invention, the reference value when the food to be heated is not placed on the turntable, that is, when the so-called relative weight is zero, is measured and stored in the nonvolatile memory element. At this time, the turntable motor is driven to rotate the turntable by a predetermined amount, a plurality of signals sampled through the weight sensor are calculated in the meantime to calculate a reference value of zero relative weight, and the obtained value is stored in the nonvolatile memory. The data is stored in the element, and the storage is started at the time when the specified time has elapsed after the drive of the turntable motor is stopped and there is no danger of harmful noise. It was not destroyed, and high-precision automatic control of heating cooking became possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram of one embodiment of the present invention. FIG. 2 is a timing chart of data communication from a microcomputer to a nonvolatile memory element. [Description of Signs] 1 turntable motor 2 weight sensor 3 drive power supply 4 relay 5 nonvolatile memory element 6 microcomputer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24C 7/02 315 F24C 7/02 551 H05B 6/68 320 H05B 6/78

Claims (1)

(57) Claims 1. A turntable motor (1) for rotationally driving a turntable, and a turntable motor attached to the turntable motor for measuring the weight of a food to be heated including the turntable. A weight sensor (2) provided, a non-volatile memory element (5) for storing information based on the signal of the weight sensor, and the turntable motor is driven without placing the food to be heated on the turntable. Then, the turntable is rotated by a predetermined amount, a plurality of signals sampled through the weight sensor are calculated in the meantime to obtain a reference value of zero relative weight, and the obtained value is stored in the nonvolatile memory element. A microcomputer (6) which starts after a predetermined time has elapsed after the drive of the turntable motor is stopped. High-frequency heating apparatus, characterized in that.