Data input apparatus for microwave oven controllers
First Claim
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1. Microwave oven control apparatus comprising:
- digital electronic processing means having data inputs representative of selected parameters for providing an output based on said parameters,power supply means for said processing means,a comparator circuit having first and second inputs and an output,a first voltage divider comprising a fixed resistor coupled to a potentiometer, the voltage generated by the voltage divider fed to the first input of the comparator, and being representative of a selected parameter,a second voltage divider comprising a fixed resistor coupled to a binary weighted resistor ladder, and means generating a voltage in the second voltage divider by enabling in turn the resistors of the ladder and feeding the voltage generated in the second voltage divider to the second input of the comparator, the comparator switching from one value to another upon the enablement of one of the resistors of the ladder, andthe output of the comparator connected to the processing means, a second comparator circuit having first and second inputs and an output,a third voltage divider comprising a fixed resistor coupled to another potentiometer, the voltage generated by the third voltage divider fed to the first input of the second comparator and being representative of a selected parameter,the voltage generated in the second voltage divider by enabling in turn the resistors of the ladder fed to the second input of the second comparator, the comparator switching from one value to another upon the enablement of one of the resistors of the ladder, andthe output of the second comparator connected to the processing means.
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Abstract
An oven controller having a microprocessor for a microwave oven has a first dial for entering time cook data in one embodiment and time or temperature cook data in other embodiments and a second dial for entering duty cycle power data. Analog signals are derived from the dials which are converted into digital signals for entering into the processor using either discrete components, separate integrated circuits or the microprocessor itself. A servo mechanism is shown in one embodiment to rotate the dials in a prescribed manner to display cook data in either time remaining or actual temperature. In other embodiments a digital display is used to provide this information.
23 Citations
3 Claims
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1. Microwave oven control apparatus comprising:
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digital electronic processing means having data inputs representative of selected parameters for providing an output based on said parameters, power supply means for said processing means, a comparator circuit having first and second inputs and an output, a first voltage divider comprising a fixed resistor coupled to a potentiometer, the voltage generated by the voltage divider fed to the first input of the comparator, and being representative of a selected parameter, a second voltage divider comprising a fixed resistor coupled to a binary weighted resistor ladder, and means generating a voltage in the second voltage divider by enabling in turn the resistors of the ladder and feeding the voltage generated in the second voltage divider to the second input of the comparator, the comparator switching from one value to another upon the enablement of one of the resistors of the ladder, and the output of the comparator connected to the processing means, a second comparator circuit having first and second inputs and an output, a third voltage divider comprising a fixed resistor coupled to another potentiometer, the voltage generated by the third voltage divider fed to the first input of the second comparator and being representative of a selected parameter, the voltage generated in the second voltage divider by enabling in turn the resistors of the ladder fed to the second input of the second comparator, the comparator switching from one value to another upon the enablement of one of the resistors of the ladder, and the output of the second comparator connected to the processing means. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeTexas Instruments, Inc.
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Original AssigneeTexas Instruments, Inc.
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InventorsScalf, Gerald W., Koberlein, James H.
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Primary Examiner(s)Reynolds, B. A.
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Assistant Examiner(s)Leung, Philip H.
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Application NumberUS06/335,023Time in Patent Office715 DaysField of Search219/10.55 B, 219/10.55 R, 219/492, 219/493, 219/506, 340/365 R, 340/365 C, 340/365 S, 340/365 VL, 340/706, 340/712, 340/753, 340/754, 307/117US Class Current219/718CPC Class CodesG05B 19/106 for selecting a programme, ...G05B 2219/25384 Analog I-O to microprocesso...H05B 6/666 Safety circuits emergency p...
