KR100268826B1 - An electricity failure ready auto-backup circuit of gas contanier auto cooking - Google Patents

Abstract

PURPOSE: An electricity failure ready auto-backup circuit of a gas container auto cooking apparatus is provided to control the time and the course of cooking, and to allow the cooking operation to be sufficiently performed even in the situation of electricity failure. CONSTITUTION: The electricity failure ready auto-backup circuit of a gas container auto cooking apparatus consists of a battery(14) installed with a DC 12V electric power source required to a control circuit of the auto cooking apparatus; an electricity failure situation detecting part(12); and an output part(13) connected to the electricity failure situation detecting part. The electricity failure situation detecting part determines whether AC electric power is input or not by connecting a variable resistor to an output terminal of a rectification part for dropping the AC electric power to DC electric power required to the control circuit. When the AC electric power is input, the output part is normally operated as well as the charge of battery is performed. Otherwise, if the input of the AC electric power is not achieved, the output part allows DC 12V electric power to be supplied under the backup of the battery.

Description

An electricity failure ready auto-backup circuit of gas contanier auto cooking}

According to the present invention, if the set temperature, the moxibustion time, and the reservation time are set in advance according to the type of rice, the temperature is automatically sensed and the cooking process and the moxibustion time are displayed on the display unit digitally and the gas can be adjusted at the same time. The present invention relates to a control technology of an automatic rice cooker, in particular, a power failure of a gas cooker automatic cooker, in which a power failure detection and subsequent backup circuits are added to a control circuit of a gas cooker automatic cooker, so that the cooking operation can be sufficiently performed even in a power failure situation. Contrast automatic backup circuit.

In general, the cooker is used in three stages with independent functions and each stage can be used separately by the user according to the purpose of cooking, which is very convenient to use the cooker. As it could not confirm, cooking time adjustment was difficult.

In view of these shortcomings, a control circuit of a gas self-cleaning machine (Korean Utility Announcement No. 94-4555) has recently been developed, which includes a sensing temperature display part, a set temperature display part, a moxibustion time display part, and And a plurality of logic circuits including a counter is installed between each display unit and the switch, the cooking valve, the sparker, the ignition valve, the buzzer, the temperature sensor, and the thermoelectric element. When the cooker is operated with the temperature and steaming time set according to the type, the temperature sensor automatically detects the temperature in the cooker and shows the cooking process and steaming time on the liquid crystal display to visually check the cooking process and steaming time. Since it is possible to adjust the cooking time.

However, the control circuit described above has a problem that the control structure is more complicated than the control operation, and the user's requirements, that is, the reservation system operated at the scheduled time, the alignment of the control panel, and the like are exposed. Gas cooker automatic cooker control circuit using the market has been released.

That is, as shown in Figure 1, the AC power input unit 10 receives a commercial AC power input, and receives power from the AC power input unit 10 is lowered to a desired voltage, but rectified and smoothed to DC power DC power rectification and smoothing unit (11), temperature sensing unit (2) for detecting the current temperature in the cooker, ignition detecting unit (3) for checking the signal of the frame load to check the ignition, and automatic rice cooker The microcomputer 1 controls the entire control of the microcomputer 1 and the control signal of the microcomputer 1, and the on / off operation is performed within the maximum current range to balance the proportional valve within the high-voltage transformer pre-ignition time during cooking operation. A proportional control unit 4 which performs a slow-opening combustion operation for the purpose of reducing the ignition sound after three repetitions, and controls the valve with the set maximum current after ignition detection and performs two-stage control according to the cooking temperature; my A buzzer driver 5 for generating a buzzer sound in the control signal of (1) and a decoder 8 (9) and a display driver 7 driven by the control signal of the microcomputer 1 are shown in FIG. Each of the present temperature display, the set temperature display, the moxibustion time display, and the reservation time display as shown in the display unit 61 and 62 are digitally displayed, and the microcomputer 1 cooks the temperature control command S1 and the moxibustion command. (S2), the switch unit 64 for inputting the reserved time command (S3), the cook command / cancel command (S5), and the power-on command (S4), and the command of the switch unit 64 for visual confirmation. It consists of the LED part 63 which displays.

The circuit configured in this way generates an energized transmission tone once with all outputs turned off when the initial power is turned on, and when the switch unit 64 for power supply (S4) of the control panel is pressed, the microcomputer 1 generates a decoder 8 of an output stage ( 9) and the display driver 7 so that the display portions 61 and 62 display the current state.

Then, in the standby state for operation, by using the switch unit 64 to select each set temperature and the steaming time and pressing the cooking and reservation switch, the microcomputer (1) controls the proportional control unit 4, but the proportional control valve is balanced If the following conditions ① and ② are satisfied after three on / off repetitive operations, combustion for cooking starts.

①. Combustion operation condition: Power switch on, cooking stop switch on, operating temperature (when set temperature is higher than sensing temperature of sensing temperature), other (without overheat or error) ②. Combustion operating conditions at the time of reservation: Power switch on, Cooking / stop switch on, Operating temperature (when set temperature is higher than detected temperature), Intermediate gas valve on, Others (No overheating or error)

Here, the temperature setting of the cooking temperature can be set to a desired value within the range of 100 ° C to 200 ° C by the cooking temperature setting switch S1, and the cooking temperature during combustion is always displayed on the display 61 in digital form. The moxibustion time can be digitally set to the desired value within the range of 0 to 20 minutes by the time setting switch (S2), and to the desired value within the range of 05 minutes to 12 hours by the reservation time setting switch (S3). Digital setting is available and it is displayed digitally when making reservation or adjusting.

In the combustion control according to the above-described conditions ① and ② that start combustion for cooking, first, in order to improve the ignition failure, the gas valve operates the ignition transformer until just before the operation, so that the instability of the combustion state after ignition during ignition It is preferable to keep the ignition operation for 5 ± 1 second after ignition for the purpose of preventing misfire by ignition. ① In case of controlling the gas valve, ①.Preheating (waiting): Wait for 5 minutes when the initial temperature is over 45 ° C. If the temperature continues to rise, an error occurs. (Right) 150mA for 1 minute at an initial temperature of 35 ° C or less. (Medium) 100mA for less than 37 ° C. Strengthening force (medium) It should be performed by neutralizing power of 100mA up to the cooking temperature above 125 ° C.

In addition to such control operations, the safety device operation and protection operation in case of abnormal occurrence, overheating prevention, pseudo salt detection at initial ignition, overvoltage, overcurrent and surge protection, initial non-ignition safety operation, and safety operation control in case of fire during combustion operation do.

As can be seen from the above, various control functions that can not be seen in the existing control circuits are possible and various high functions such as a reservation system operated at a reserved time can be seen. However, the above-mentioned control circuit also has its drawbacks. That is, the above-described control operation is based on a stable power supply. Therefore, if a power failure occurs during cooking, the control operation itself cannot be executed and the power is restarted after the power failure. Even if supplied, there was a problem such as having to reset the initial setting process.

The present invention was developed in view of the above problems, the object of which is to add a power outage detection and the backup circuit according to the control circuit of the automatic automatic cooking rice cooker gas cooker to perform the cooking operation sufficiently in the power failure situation The present invention provides an automatic backup circuit against the blackout of the automatic crusher.

The present invention for achieving the above object in the configuration of the automatic backup circuit against the power failure in the control circuit of the automatic rice cooker using a microcomputer, electrostatic DC 12V power required for the control circuit of the automatic rice cooker A power failure detection unit that detects whether AC power is input by connecting a variable resistor to the battery installed as a backup power source and the rectifier and smoothing unit that receives commercial AC power from the power input unit and drops to DC power required for the control circuit. When the AC power is normally input, the battery is charged with normal operation. When the AC power is not input, the output unit is configured to backup the battery and supply the DC 12V power.

1 is a block diagram showing a control circuit of the automatic rice cooker using a general micom;

2 is a view illustrating an example of a display unit and an operation unit applied to FIG. 1;

Figure 3 is a block diagram for explaining the automatic backup circuit against the blackout of the present invention automatic rice cooker

4 is a detailed circuit diagram of the automatic backup circuit against power failure of FIG. 3.

<Explanation of symbols for main parts of the drawings>

10: AC power input, 11: DC power rectification and smoothing,

12: outage detection unit, 13: output unit,

14: Battery.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram illustrating an automatic backup circuit against a power failure of the gas cooker automatic cooking machine of the present invention, and FIG. 4 is a detailed circuit diagram of the automatic backup circuit against the power failure of FIG. 3.

The present invention is to add the automatic backup circuit as shown in Figure 2 to the control circuit of the conventional automatic rice cooker using a microcomputer described in Figure 1, more specifically, if the input of commercial AC power The DC power rectifying and smoothing unit 11 and the current temperature in the cooker receive the power from the AC power input unit 10, the AC power input unit 10, and drop to the desired voltage and rectify and smooth the DC power. The temperature detecting unit 2 for sensing, the ignition detecting unit 3 for checking the signal of the frame rod to check ignition, the microcomputer 1 for overall control of the gas cooker and the micro-cooker, and the microcomputer 1 In order to balance proportional valve within the high-voltage transformer pre-ignition time, the on / off operation is repeated three times within the maximum current range to reduce the ignition sound. After the combustion operation is performed in the open manner and after ignition detection, the proportional control unit 4 controls the valve with the set maximum current and performs two-stage control according to the cooking temperature, and a buzzer that generates a buzzer sound in the control signal of the microcomputer 1. In accordance with the driver 5 and the decoder 8 (9) and the display driver 7 driven by the control signal of the microcomputer 1, each present temperature display as shown in FIG. Display unit 61, 62 in which the time display and the reservation time display are digitally displayed, and the microcomputer 1 controls the cooking temperature control command S1, the moxibustion command S2, the reservation time command S3, and the cooking command. Using a microcomputer composed of a switch unit 64 for inputting a cancel command (S5) and a power-on command (S4), and a LE D unit (63) for visually confirming the command of the switch unit (64). In the control circuit of the automatic rice cooker, DC 12V required for the control circuit of the automatic rice cooker On the output terminal of the battery 14 and the DC power rectifying and smoothing unit 11 which receives the commercial AC power from the AC power input unit 10 and drops it to the DC power required for the control circuit. Connected to a variable resistor to detect the power supply to the AC power supply 12 and the power failure detection unit 12 is connected to the AC power is normally input, the battery is charged with normal operation and AC power is not input If not, the output unit 13 for backing up the battery 14 to supply DC 12V power is additionally configured.

Here, the DC power rectifying and smoothing unit 11 has a bridget diode (BD) for rectification is connected to the AC power input terminal, a plurality of resistors (R1) (R2) is connected to the bridge diode (BD). The variable resistor VR is connected, and the capacitor C is connected in parallel to the contact between the bridge diode BD and the resistor.

The electrostatic detection unit 12 has a variable resistor (VR) is connected to the non-inverting input terminal (+) of the comparator 1 (OP1), a reference voltage source is connected to the inverting input terminal (-), the non-inverting input terminal (+) The capacitor C2 is connected between and the inverting input terminal (-). The output terminal of the comparator 1 (OP1) is connected to the non-inverting input terminal (+) of the comparator 2 (OP2) via the resistor R4 and is input to the inverting input terminal (-) of the comparator 1 (OP 1). + 5V) is connected to the inverting input terminal (-). Here too, a capacitor C3 is connected between the two input terminals. The photocoupler PC and the resistor R6 are connected to the output terminal of the comparator 2 (OP2), and the resistor R3 is connected to the contact between the output terminal of the comparator 2 (OP2) and the resistor R4 and the resistor R6. It is connected to the other terminal of).

The output part 13 is connected to the collector of the transistor which is the light receiving part of the photocoupler PC, and the gate of the field effect transistor Q is connected, and the source is connected to the negative terminal of the battery 14.

The gate of the field effect transistor Q is connected to the positive terminal of the battery 14 through a resistor R7. A power supply terminal of DC + 12V is connected to the drain of the field effect transistor Q.

In the circuit configured as described above, the input voltage is rectified by the bridge diode BD, and the voltage detected by the variable resistor VR is applied to the non-inverting input terminal (+) of the comparator 1 (OP1). In case of power failure, the voltage of the non-inverting input terminal (+) is adjusted using the variable resistor VR so that the voltage of the inverting input terminal (-) can be lower than 5V.

During normal operation, i.e., when the AC voltage is normally input, the voltage detected by the variable resistor VR through the DC power rectifying and smoothing unit 11 is applied to the non-inverting input of the comparator 1 (OP1) of the electrostatic sensing unit 12. Input to terminal (+). A high signal is applied to the output of the comparator 1 (OP1), and a high signal, which is an output signal of the comparator 1 (OP1), is input to the non-inverting input terminal (+) of the comparator 2 (OP2). At this time, the output of the comparator 2 OP2 also becomes a high signal and the photocoupler PC does not operate. Therefore, the output part 13 of this circuit is maintained in the normal state which is inoperable. Naturally, of course, the commercial power is automatically charged to the battery 14.

If the AC voltage is not input at the time of power failure, the voltage detected from the variable resistor VR is a low signal. Therefore, since the voltage of the non-inverting input terminal (+) of the comparator 1 (OP1) is lower than the voltage of the inverting input terminal (-), the output of the comparator 1 (OP1) becomes a low signal, and this signal is the non-inverting of the comparator 2 (OP2). It is applied to the input terminal (+). 5V is applied to the inverting input terminal (-) of the comparator 1 (OP1) in connection with the inverting input terminal (-) of the comparator 2 (OP2). Accordingly, the output of the comparator 2 (OP2) becomes a low signal to operate the photocoupler PC.

In the output unit 13, a transistor, which is a light receiving unit of the photocoupler PC, is turned on, and power is applied to the gate of the field effect transistor Q. When the transistor is operated, the power source of the battery 14 is a DC + 12V power supply terminal. Since the DC power supply rectification and smoothing unit 11 is applied to supply the power of the battery 14 to the automatic cooking control circuit, even when a power failure occurs, the continuous cooking operation can be performed.

As described above, the present invention has a feature that the cooking operation can be sufficiently performed in any power failure situation by adding a simple power failure detection and a backup circuit to the automatic rice cooker using the microcomputer.

Claims (1)

In configuring the automatic backup circuit against the power failure in the control circuit of the automatic rice cooker using a microcomputer, A battery 14 having a DC 12V power required for the control circuit of the gas cooker as a backup power supply for static electricity, and An electrostatic detection unit 12 which receives a commercial AC power from the AC power input unit 10 and connects a variable resistor to an output terminal of a rectifying and smoothing unit that drops to a DC power required for a control circuit and detects whether AC power is input; The output unit 13 is connected to the power failure detecting unit 12, and when the AC power is normally input, the battery is charged with normal operation, and when the AC power is not input, the battery 14 is backed up to supply DC 12V power. Automatic backup circuit against blackout of gas cooker automatic cooker, characterized in that consisting of.