KR200388619Y1 - Electronic Pressure rice pot for preventing a fault or a bad operation - Google Patents

Abstract

Disclosed is an electronic pressure cooker which prevents malfunction or malfunction. Equipped with an abnormal voltage cutout and a voltage sensing unit to cut off the abnormal voltage noise generated in accordance with the power consumption applied to the electromagnetic pressure cooker to eliminate the damage or malfunction of the internal circuit of the electromagnetic pressure cooker, preventing failure or malfunction Provide an electronic pressure cooker.

Description

Electronic pressure rice pot for preventing a fault or a bad operation

The present invention relates to an electromagnetic pressure cooker, and more particularly, to an electromagnetic pressure cooker to block the abnormal voltage noise generated when a predetermined voltage is applied to prevent the malfunction or malfunction.

The electronic pressure cooker has a low-cost heater heating method for heating the bottom, and an IH (Induction Heating) method for heating the whole inner pot with a coil and evenly electric pressure cooking.

Recently, the electric pressure rice cooker is mainly composed of the electric pressure type and the IH method, and among these two methods, the IH method is used a lot.

The IH type electromagnetic pressure cooker includes a heating part and an IGBT driving part. The heating unit is driven by receiving a predetermined power, and the IGBT driver adjusts power consumption generated by applying the predetermined power through switching ON / OFF.

That is, the IGBT driver includes a semiconductor switching element, and the semiconductor switching element freely controls the power consumption by adjusting timing through ON / OFF.

However, the IGBT driver is an embedded circuit very sensitive to power supply noise generated according to the power consumption. That is, when the power consumption applied to the electromagnetic pressure cooker is large, the voltage noise is also largely generated. Accordingly, the IGBT driver may be damaged or malfunction due to the voltage noise, thereby causing damage to the electromagnetic pressure cooker.

Related to the present invention, the problem with the conventional electronic pressure cooker solved by the present invention is as follows.

The electromagnetic pressure cooker has a problem in that the IGBT driving unit provided in the electromagnetic pressure cooker is broken or malfunctions due to voltage noise generated along with the power consumption. Accordingly, the electromagnetic pressure cooker is broken or malfunctioning.

An object of the present invention is to provide an abnormal voltage blocking unit and a voltage sensing unit for blocking the abnormal voltage noise generated in accordance with the power consumption applied to the electromagnetic pressure cooker to eliminate the breakage or malfunction of the internal circuit of the electronic pressure cooker, Or it provides an electronic pressure cooker to prevent malfunction.

In an electromagnetic pressure cooker comprising a heating unit for driving a predetermined power supplied and an IGBT driving unit for turning on / off the driving of the heating unit, the voltage sensing unit for generating a drive control signal according to the potential difference transmitted from the heating unit ; And an abnormal voltage blocking unit configured to generate an abnormal voltage blocking signal for turning on / off driving of the heating unit according to the voltage level of the driving control signal and transferring the generated abnormal voltage blocking signal to the IGBT driving unit.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

1 is a block diagram schematically showing an electromagnetic induction heating cooker according to a preferred embodiment of the present invention.

Referring to FIG. 1, the electromagnetic induction heating cooker includes a heating unit 100, a voltage sensing unit 110, an abnormal voltage blocking unit 120, and an IGBT driving unit 130.

First, the heating unit 100 provided in the electromagnetic pressure cooker performs an operation of cooking rice through power consumption generated by applying a predetermined voltage, which is electrical energy. That is, the heating unit 100 generates an abnormal voltage noise as an interference factor in generating the power consumption, and cooks the rice through heating of a built-in heating coil plate. In addition, the heating unit 100 is driven according to the on / off of the IGBT driving unit 130, the heating unit 100 is the voltage sensing unit 110 to the abnormal voltage noise generated by the potential difference generated between both ends. To pass).

Next, the voltage detector 110 receives the abnormal voltage noise and compares the abnormal voltage noise with a predetermined generated reference voltage. Accordingly, the voltage detector 110 generates a high level driving control signal when the abnormal voltage noise is smaller than the reference voltage noise, and generates a low level driving control signal when the abnormal voltage noise is larger than the reference voltage noise. The comparator 113 is built.

The inverting terminal (-) of the comparator 113 is connected to both ends of the heating unit 100 and is connected to the voltage feedback unit 111 for receiving the potential difference, and the non-inverting terminal of the comparator 113 ( +) Is connected to the reference voltage unit 112 for generating a reference voltage to be compared with the potential difference.

Here, the reference voltage is a reference interference value preset by the voltage detector 110. That is, a high level drive control signal is generated when the reference voltage does not exceed the abnormal voltage noise, and a low level drive control signal is generated when the abnormal voltage noise exceeds the reference voltage.

Next, the abnormal voltage blocking unit 120 generates an abnormal voltage blocking signal for turning on / off driving of the heating unit 100 according to the voltage level of the driving control signal to generate the IGBT driving unit ( 130). That is, the abnormal voltage blocking signal has a high state when the driving control signal is high level and has a low state when the driving control signal is low level. In addition, the abnormal voltage blocking unit 120 receives a high level driving control signal transmitted from the voltage sensing unit 110 and a low voltage transmitted from the first driving element turned on / off and the voltage sensing unit 110. And a second driving element which is turned on / off by receiving a driving control signal of a level.

Next, when the Insulate Gate Bipolar Transistor (IGBT) driver 130 selectively receives the high / low level abnormal voltage blocking signal, the IGBT driving unit 130 controls the heating unit 100 by turning on / off. That is, since the IGBT driver 130 is a circuit sensitive to the abnormal voltage noise, the IGBT driver 130 receives the high / low level abnormal voltage blocking signal generated by the abnormal voltage blocking unit 120, thereby causing its own circuit breakdown or malfunction. Can be reduced to a minimum.

2 is a circuit diagram illustrating an abnormal voltage blocking unit provided in an electromagnetic induction heating cooker according to a preferred embodiment of the present invention.

Referring to FIG. 2, the abnormal voltage blocking unit 130 is configured as a monostable multivibrator. In addition, the monostable multivibrator includes a first resistor R1, a second resistor R2, a third resistor R3, a transistor Q, a diode-connected transistor Q ', and a capacitor C.

In general, the monostable multivibrator generates an output pulse in a metastable state when an input pulse is applied in a stable state. The output pulses appear only after a predetermined interval and then disappear. The output pulses return to a stable state and remain stable until a new input pulse is given.

The monostable multivibrator receives the driving control signal from the voltage sensing unit 110. That is, the monostable multivibrator receives a high level drive control signal generated by the voltage detector 110 when a predetermined reference voltage noise is greater than the abnormal voltage noise.

Here, the abnormal voltage blocking unit 120 receives the high level driving control signal and generates a high level abnormal voltage blocking signal which is a signal for the IGBT driver 130 to be normally driven.

As a result, the first resistor R1 is pulled up (PUll-UP) and the second resistor R2 and the transistor Q are conductive. At this time, the transistor Q is at a low level to cut off the diode transistor Q2, and a predetermined power supply 12V is charged through the base and emitter of the first resistor R1, the capacitor, and the transistor Q. As the first resistor R1 is pulled up, an abnormal voltage blocking signal having a high level is generated and the abnormal voltage blocking signal having a high level is applied to the IGBT driver 130 to switch the semiconductor embedded in the IGBT driver 130. Switch the device on.

Subsequently, the monostable multivibrator receives a low level driving control signal, which is a signal indicating that an abnormal state is abnormal when the abnormal voltage noise is greater than a predetermined reference voltage noise.

Here, the abnormal voltage blocking unit 120 receives the low level driving control signal and generates a low level abnormal voltage blocking signal, which is a signal for blocking the IGBT driver 130 from being abnormally driven.

As a result, the power charged in the capacitor C is rapidly discharged, the base of the transistor Q and the capacitor C are charged with a negative power, and the transistor Q is cut off. In addition, the diode-connected transistor Q 'is turned on by the third resistor R3. As the capacitor C is rapidly discharged, an abnormal voltage blocking signal having a low level is generated and the abnormal voltage blocking signal is applied to the IGBT driver 130 to switch off the semiconductor switching element embedded in the IGBT driver 130. OFF).

Thereafter, the monostable multivibrator is charged for a predetermined time t sec through the collector and base of the second resistor R2, the capacitor C and the diode-connected transistor Q ', and the base and the capacitor C of the transistor Q are supplied to the negative power source. It is conducting because it is not hanging. In addition, the diode-connected transistor Q 'is blocked. Accordingly, the first resistor R1 is pulled up again to generate an abnormal voltage blocking signal of a high level. In addition, the high level abnormal voltage blocking signal is applied to the IGBT driver 130 to switch ON the semiconductor switching element embedded in the IGBT driver 130 again.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the utility model registration claims below It will be appreciated that it can be changed.

Equipped with an abnormal voltage blocking unit and a voltage sensing unit for blocking the abnormal voltage noise generated in accordance with the power consumption applied to the electromagnetic pressure cooker to remove the damage or malfunction of the internal circuit of the electromagnetic pressure cooker, to prevent failure or malfunction Give effect.

1 is a block diagram schematically showing an electromagnetic induction heating cooker according to a preferred embodiment of the present invention.

2 is a circuit diagram illustrating an abnormal voltage blocking unit provided in an electromagnetic induction heating cooker according to a preferred embodiment of the present invention.

Claims (6)

In the electromagnetic pressure cooker is provided with a heating unit for driving by receiving a predetermined power and the IGBT driving unit for turning on / off the driving of the heating unit, A voltage sensing unit generating a driving control signal according to the potential difference transmitted from the heating unit; And And an abnormal voltage blocking unit configured to generate an abnormal voltage blocking signal for turning on / off driving of the heating unit according to the voltage level of the driving control signal and transmitting the abnormal voltage blocking signal to the IGBT driving unit. The method of claim 1, wherein the voltage sensing unit, A comparator having an inverting and non-inverting terminal for generating a high / low level driving control signal by comparing a potential difference generated between both ends of the heating unit and a predetermined reference voltage; The inverting terminal is connected to both ends of the heating unit is connected to the voltage feedback unit for receiving the potential difference output from the heating unit, The non-inverting terminal is connected to the reference voltage unit for generating a reference voltage to be compared with the potential difference is fed back the electromagnetic pressure cooker. The electromagnetic pressure cooker according to claim 2, wherein the potential difference is an abnormal voltage noise which is a main factor of malfunction or circuit breakage generated in the heating unit. The driving control signal of a high level is generated when the reference voltage does not exceed the abnormal voltage noise, and the driving control signal of a low level is generated when the abnormal voltage noise exceeds a reference voltage. Electromagnetic pressure cooker. 5. The high / low level abnormal voltage blocking signal is generated as the high / low level driving control signal is input to the abnormal voltage blocking unit, and the IGBT driving unit is turned on / off. Electronic pressure cooker, characterized in that the operation. The method of claim 1, wherein the abnormal voltage blocking unit, A first driving element which is turned on / off by receiving a high level driving control signal transmitted from the voltage sensing unit; And And a second driving element which is turned on / off by receiving a low level driving control signal transmitted from the voltage sensing unit.