KR100738710B1 - Voltage supplier of cooking utensils - Google Patents

Abstract

A voltage supplying apparatus of cooking utensils is provided to prevent a load from operating when an operation state of the cooking utensil is not displayed on a displaying unit by blocking a decoder IC with an enable state from entering when a display driving voltage generating unit is out of order. A voltage supplying apparatus of cooking utensils includes a first voltage generating unit, a second voltage generating unit, and a decoder unit. The first voltage generating unit generates driving voltage to drive a displaying unit(120) which displays an operation state of the cooking utensil. The second voltage generating unit generates driving voltage to drive a microcomputer(220) which controls the operation of the cooking utensil. The decoder unit is controlled by the microcomputer(220), and outputs a signal to control a load of the cooking utensil. The voltage, which determines whether the decoder unit is enabled, is the driving voltage outputted from the first voltage generating unit.

Description

Voltage supplier of cooking utensils

1 is a configuration block diagram of a cooker for explaining the operation of a conventional cooker.

2 is a configuration block diagram of a cooker for explaining the operation of the cooker according to the present invention.

* Description of the symbols for the main parts of the drawings *

110: display driving voltage generator 120: display unit

210: microcomputer driving voltage generator 220: microcomputer

330: decoder IC 340: switching unit

410: load

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker, and more particularly, a cooker capable of interlocking an operation of a display unit and a cooker load by using a driving voltage supplied to a display unit showing an operation state of the cooker as an enable signal of a decoder IC for controlling the load of the cooker. Relates to a voltage supply device.

In general, a cooker such as a microwave oven, a gas range, a gas oven range, an electric oven range, etc., is a kitchen appliance used for cooking food and is installed and used in most homes or restaurants.

Although these cookers may be manufactured and marketed to be faithful to the cooking function, it is a general trend that a display unit for displaying the operation state of these cookers is mounted on one side of the front side of these cookers due to the recent development of technology.

The display unit typically displays various information necessary for cooking such as the type of cooking set by the cooker user, the current temperature, the cooking time, and the like. It will depend on what you set.

Hereinafter, a description will be given of how the voltage supply device of the conventional cooker is used in the cooker with reference to FIG. 1.

1 is a block diagram illustrating a cooker for explaining an operation of a conventional cooker.

In FIG. 1, the display driving voltage generator 110 receives an AC voltage supplied from a power company and converts the AC voltage into a DC driving voltage that can be used to drive the display 120. 210 serves to convert an AC voltage supplied from a power company into a DC driving voltage that can be used to drive the microcomputer 220 controlling the operation of the cooker. One of the reasons for separately manufacturing the display driving voltage generator 110 and the microcomputer driving voltage generator 210 is to operate the cooker normally by operating the microcomputer 220 regardless of malfunction or damage to the display unit. To do so.

The microcomputer 220 controls the operation of the cooker and controls the display unit 120 to display the operation state of the cooker on the display unit 120.

In addition, the microcomputer 220 applies a predetermined command signal to the decoder IC 310 to selectively operate the load 410 such as a magnetron, a heater, and a burner installed in the cooker to enable cooking.

The decoder IC 310 transmits a decoding signal for turning on a switch connected to a specific load to the switching unit 320 in response to the command signal applied from the microcomputer 220.

The switching unit 320 outputs a signal for selectively operating the magnetron, the heater, the burner, etc. to the load 410 according to the decoding signal transmitted from the decoder IC 310.

Meanwhile, the driving voltages of the decoder IC 310 and the switching unit 320 are generally supplied from the microcomputer driving voltage generator 210 similarly to the microcomputer 220.

However, the conventional case has the following problems.

Even when the operating state of the cooker is not normally displayed on the display unit 120 because the normal voltage desired by the designer is not output from the display driving voltage generator 110 due to a malfunction or failure of the display driving voltage generator 110. The load 410 may operate normally. This situation occurs because the driving voltage generation unit for driving the display unit 120 and the driving voltage generation unit for driving the load 410 operate substantially independently.

As such, when the operation state of the cooker is not normally displayed on the display unit 120, when the load of the cooker is operated, the user may not grasp the degree of overheating of the load at all, which may be caused by a fire or a product due to the overheating of the cooker. There is a problem that can cause a legal dispute related to the liability system (PL).

The present invention has been proposed in order to solve the above-mentioned conventional problems, and to provide a method of preventing a safety accident in advance by blocking the operation of the load in advance when the display driving voltage generator malfunctions.

To this end, an aspect of the present invention is to provide a cooker voltage supply device that interoperates with a display driving voltage generator to enable or disable a decoder IC for controlling an operation of a cooker load.

The voltage supply apparatus of the cooker proposed by the present invention includes a first voltage generator for generating a driving voltage for driving the display unit displaying the operation state of the cooker, and a driving voltage for driving the microcomputer for controlling the operation of the cooker. A second voltage generator configured to generate a voltage and a decoder controlled by the microcomputer to output a signal for controlling a load of the cooker, wherein a voltage for determining whether the decoder is enabled is the first voltage generator; It is characterized in that the drive voltage output from.

In the present invention, the driving voltage for driving the decoder is characterized in that the driving voltage output from the second voltage generator.

In the present invention, the load is characterized in that the magnetron, heater, or burner installed in the cooker.

Hereinafter, with reference to the drawings will be described in detail a preferred embodiment of the cooking voltage supply device proposed in the present invention.

FIG. 2 is a block diagram illustrating a cooker for explaining the operation of the cooker proposed in the present invention. For reference, among the configurations of the present invention, the same numbers as those of the conventional configurations may be determined to have substantially the same configurations and functions.

In FIG. 2, the display driving voltage generator 110 receives an AC voltage (eg, 220V) supplied from a power company and converts the DC driving voltage Vdisp to be used for driving the display 120. Do it.

The microcomputer driving voltage generator 210 receives an AC voltage supplied from a power company and converts the microcomputer driving voltage into a DC driving voltage Vmic that can be used to drive the microcomputer 220 controlling the operation of the cooker.

The driving voltage Vdisp output from the display driving voltage generator 110 and the driving voltage Vmic output from the microcomputer driving voltage generator 210 are determined by the display unit 120 and the microcomputer 220 receiving the display voltage 120. Since it is related to the operating voltage, the voltage levels of these driving voltages may vary depending on the kind of display unit 120 and the microcomputer 220.

The display unit 120 includes a light emitting device such as an LED, a VFD, and the like, which can display an operation state of the cooker. Therefore, the user can easily grasp the operation state of the cooker from the contents displayed on the display 120.

The microcomputer 220 controls the operation of the cooker, and controls the display 120 to display the operation state of the cooker on the display 120.

In addition, the microcomputer 200 outputs a digital signal for controlling the operation of the decoder IC 330. The decoder IC 330 is a decoder circuit that selects one of 2 ⁿ output lines by using a digital signal applied from the microcomputer 200 through n input signal lines. The decoder IC 330 is implemented.

As a driving voltage of the decoder IC 330, a driving voltage Vmic output from the microcomputer driving voltage generator 210 is used. In order to perform the normal operation of the decoder IC 330, it is not enough to apply the driving voltage Vmic, and the voltage of the enable terminal / OE of the decoder IC 330 is at a low level. Ground level). When the enable terminal / OE of the decoder IC 330 is maintained at a low level, the decoder IC 330 may normally recognize a digital signal applied from the microcomputer 220.

Therefore, in order for the decoder IC 330 to enter the enabled state, a high level signal output from the microcomputer 220 must be applied to the base of the illustrated NPN transistor. When the NPN transistor is turned on and the enable terminal (/ OE) of the decoder IC 330 is activated (ie, enabled), the decoder IC 330 outputs an output line in response to a digital signal applied from the microcomputer 220. Select one of them to enable. Typically, the selected output line is typically enabled at a high level.

The switching unit 340 is configured of an electronic switch element that has a one-to-one correspondence with the output line of the decoder IC 330. When one of the output lines of the decoder IC 330 is enabled at a high level, a specific switching corresponding thereto is performed. The device is turned on. These electronic switch elements are well known to those skilled in the art, and are not related to the essential components of the present invention, and thus the detailed configuration thereof will be omitted.

The switching unit 340 is connected to a load 410 including a magnetron, a heater, or a burner, which is a heating source of the cooker. Therefore, when a predetermined switching element in the switching unit 340 is turned on, the load connected thereto operates.

Hereinafter, a method of detecting a malfunction in the display driving voltage generator 110 and blocking the operation of the load in advance will be described with reference to FIG. 2.

First, when a power supply voltage is supplied to the cooker, driving voltages Vdisp and Vmic are generated from the display driving voltage generator 110 and the microcomputer driving voltage generator 210, respectively, to generate the display 120 and the microcomputer 220. Each is applied as a driving voltage.

Next, the user operates a cooker to select a button for operating a load such as a heater, a grill, or the like, which is a heating source suitable for food.

The microcomputer 220 transmits predetermined information about cooking, such as a heating source, a cooking time, and a current temperature, to heat the food selected by the user to the display 120.

At the same time, the microcomputer 220 applies a command signal to the decoder IC 330 to operate a heater, a grill, or the like for heating the food.

As is well known, in order to operate the decoder IC 330 sold as a semiconductor device, a driving voltage Vmic for operating the internal circuit of the decoder IC 330 must be applied first. In a state in which the driving voltage Vmic is applied, a voltage is applied to the enable terminal / OE of the decoder IC 330 at a low level in order for the decoder IC 330 to receive a predetermined command signal from the microcomputer 220. Should be.

In the present invention, the driving voltage Vmic of the decoder IC 330 is generated and supplied from the microcomputer driving voltage generator 210 when the power supply voltage is supplied to the cooker.

In addition, in the present invention, in order to enable the enable terminal (/ OE), a resistor (R) and an NPN transistor connected in series between the driving voltage (Vdisp), which is an output voltage of the display driving voltage generator (110), and ground, are connected. In the provided state, the collector of the NPN transistor connected to the enable terminal / OE is transitioned to the low level by turning on the base of the NPN transistor using the microcomputer 220.

When the enable terminal (/ OE) is enabled at a low level, the decoder IC 330 receives a command signal transmitted from the microcomputer 220, decodes it, and transmits the decoded signal to the switching unit 340. The load 410 connected to the unit 340 is operated.

As can be seen above, when the driving voltage Vdisp is normally output from the display driving voltage generator 110, the enable terminal / OE of the decoder IC 330 can be controlled.

However, when the driving voltage Vdisp is in a floating state due to a failure or the like in the display driving voltage generation unit 110 due to some cause, the normal control of the enable terminal / OE is impossible.

That is, in the present invention, by using the driving voltage Vdisp generated from the display driving voltage generator 110 as an enable determination voltage of the enable terminal / OE that determines whether the decoder IC 330 is enabled. When the display driving voltage generation unit 110 malfunctions, the display driving voltage generation unit 110 cuts off a predetermined decoding signal from the decoder IC 330 to the switching unit 340.

Therefore, when the state of the cooker is not normally displayed on the display 120 due to a malfunction of the display driving voltage generator 110, the load 410 may also be disabled.

In addition to the above, the technical idea of the present invention should be considered to include various modifications of all forms using whether the circuit for controlling the load 410 is enabled as the driving voltage Vdisp of the display driving voltage generator 110. This should also be applied comprehensively in the interpretation of the claims set out below.

The present invention uses the driving voltage Vdisp of the display driving voltage generator 110 to determine whether to enable the decoder IC for controlling a load such as a heater or a grill.

As a result, when the display driving voltage generation unit 110 malfunctions or a failure occurs and the operation state of the cooker is not displayed on the display unit 120, the cooker IC is blocked from entering the enable state in advance. It is possible to prevent the load from operating in a state where the operation state of the display unit is not displayed.

Therefore, it is possible to obtain the effect of preventing the accident that can occur unknowingly in advance.

Claims (3)

In the cooker voltage supply device, A first voltage generator configured to generate a driving voltage for driving the display unit displaying an operation state of the cooker; A second voltage generator configured to generate a driving voltage for driving the microcomputer for controlling the operation of the cooker; The decoder is controlled by the microcomputer and outputs a signal for controlling the load of the cooker. The voltage supply device for determining whether to enable the decoder unit is a driving voltage output from the first voltage generator. The method of claim 1, The driving voltage for driving the decoder unit is a driving voltage output from the second voltage generating unit. The method of claim 1, And the load is a magnetron, a heater, or a burner installed in the cooker.

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