KR20230143090A - Overcurrent and overvoltage circuitry for cooking appliances - Google Patents

Abstract

Disclosed is a cooking appliance with improved heating control and grinding efficiency that not only protects the processor unit from overcurrent and overvoltage using a zero crossing detection unit and an independent power source, but also allows the zero crossing detection unit or bias circuit unit to be easily replaced. A cooking appliance with such improved heating control and grinding efficiency includes a first power unit 20; a second power supply unit 30; A zero crossing detection unit 50 that detects and outputs each zero crossing point (0 crossing point) of the AC voltage; It is driven by the first direct current voltage supplied from the first power unit 20, and a control signal for controlling the cooking operation of the cooking appliance according to the user's cooking command or cooking settings through the operation unit 70 is sent to the zero crossing detection unit 50. a processor unit 80 that outputs output in synchronization with the zero crossing point provided by; a second bias circuit unit 90 that selectively outputs a second bias voltage when the combination of the first direct current voltage supplied from the first power unit 20 and the output voltage of the processor unit 80 is satisfied; It consists of an output unit 100 that switches and controls the operation of a heating device or power generator installed to be electrically connected to the inside of the main body according to the output voltage of the second bias circuit 90.

Description

Cooking appliances with improved heating control and grinding efficiency {Overcurrent and overvoltage circuitry for cooking appliances}

*The present invention relates to a cooking appliance with improved heating control and grinding efficiency. More specifically, it not only protects the processor unit from overcurrent and overvoltage by using a zero crossing detection unit and an independent power supply, but also protects the processor unit from overcurrent and overvoltage by using a zero crossing detection unit or a bias circuit unit. The purpose is to provide a cooking device with improved heating control and grinding efficiency that can be easily replaced.

Various types of detection units can be applied to a cooker for automatically cooking tofu or soy milk. For example, an overflow prevention unit to prevent water from overflowing during the cooking process may be installed in an automatic cooker so that the water level inside the cooker can be detected. Additionally, a no-water detection unit is installed to prevent the automatic cooker from overheating by operating the heater in the absence of water. As such, various types of detection units may be placed in the automatic cooker and appropriate circuits for operation of such detection units may be placed. However, if excessive voltage or current is introduced, the detection unit or the circuitry included in the detection unit itself may be damaged. Therefore, protective measures for the detection unit are needed.

Patent Publication No. Special 1996-0006694 discloses an inverter that heats the load by applying high-frequency current to the working coil by alternately switching switch elements when a direct current voltage is input through a filtering means and a rectifying/smoothing means, and a switch element of the inverter. Inverter driving means for controlling, input current detection means for detecting the amount of current input to the inverter,

A microcomputer for outputting a signal for heating a load and detecting the presence of a load, a separation means for separating the power supply from the signal output from the microcomputer, and a current for the signal separated and input through the separation means. A current setting means that changes the level signal, a normal load determination means that compares the input current monitoring signal and the set current level to determine whether it is a normal load, and a voltage control oscillation that controls the inverter driving means according to the output of the separation means. Disclosed is a protection circuit for an induction heating cooker consisting of a start/stop means for controlling the operation of the means, and a current feedback means for supplying a control voltage to the voltage control oscillation means according to the output of the start/stop means.

Patent Registration No. 10-1591680 relates to a detection unit protection module that protects the detection unit by a separation switch and an independent power source, and an automatic cooker with improved insulation thereby. The protection module 10 includes a detection sensor 12 for detecting the operating conditions of the output unit H; a first detection processor 14 for receiving a signal from the detection sensor 12; A separation switch 15 that receives a control signal output from the first detection processor 14; and a second detection processor 16 that controls the operation of the output unit by receiving a signal transmitted from the separation switch 15, wherein the separation switch 15 consists of a transmitting terminal and a receiving terminal that are spatially spaced apart from each other, And the first detection processor 14 and the second detection processor 16 are operated by independent power sources.

Meanwhile, Utility Model Registration No. 20-0327502 is a soymilk maker that crushes soybeans to make okara, separates them into okara and soybean juice, and heats the soybean juice to produce soymilk. The inner side of the container cover that covers the heating container of the soymilk maker. Disclosed is a foam detection and blocking device for a soy milk maker that has a rod-shaped sensor to detect the level of foam generated and simultaneously controls a heating plate that heats soybean juice according to the detected signal to remove foam.

In addition, Patent Publication No. 10-2009-0116074 uses three or more different reference voltages to determine whether the resonance current supplied to the working coil is overloaded in a protection circuit to prevent overload due to eccentricity of the container in an induction heating cooker. a node at which a limiting voltage having a magnitude is measured; a start limiter and a middle output limiter connected to the node to output different levels of the limit voltage depending on whether there is a short circuit; and a comparison unit for comparing the voltage level of the resonance current supplied to the working coil with the limit voltage measured at the node.

In addition, utility model registration number 20-0272968 includes a ground electrode and a signal electrode connected by selecting two of the component parts on the main body, a resistor and a switching transistor connected to the signal electrode, and a water Disclosed is a water-free detection alarm device that includes a controller that outputs a control signal to warn when this is detected, a resistor and a switching transistor connected to the controller, and a buzzer connected to the switching transistor.

Cooking appliances disclosed in the prior art do not have separate protection means or detect overload through an independent judgment process. However, the detection unit or detection circuit itself is not protected by such means. Damage to the detection unit or detection circuit has the disadvantage of preventing the detection itself from proceeding, which may cause damage to the entire cooker or cause a safety accident.

In order to solve the shortcomings of these prior technologies, Patent Registration No. 10-1591680 (January 29, 2016) includes a detection unit protection module that protects the detection unit by a separation switch and an independent power source, and thereby improved insulation. It's about automatic cooking. The protection module 10 includes a detection sensor 12 for detecting the operating conditions of the output unit H; a first detection processor 14 for receiving a signal from the detection sensor 12; A separation switch 15 that receives a control signal output from the first detection processor 14; and a second detection processor 16 that controls the operation of the output unit by receiving a signal transmitted from the separation switch 15, wherein the separation switch 15 consists of a transmitting terminal and a receiving terminal that are spatially spaced apart from each other, Also, the first detection processor 14 and the second detection processor 16 are protection modules for detection units operated by independent power sources, and an automatic cooker with improved insulation having the same is disclosed.

However, because this last technology requires two independent detection processors, many design variables remain, such as space constraints within the main body, increased costs, and interlocking operations with other parts.

Patent Publication No. Special 1996-0006694 (published on February 23, 1996) Protection circuit of induction heating cooker (No. 10-1591680 registered on January 29, 2016) Patent Publication No. 10-2009-0116074 (published on November 11, 2009) Protection circuit for induction heating cooking appliance and induction heating cooking appliance including protective circuit Utility model registration number 20-0272968 (released on April 20, 2002) Water-free detection and alarm device for household soymilk, soft tofu, and tofu manufacturing equipment

The present invention was developed to solve the problems of the prior art. The purpose of the present invention is to apply a zero crossing detector and an independent power source to limit the scope of insulation breakdown even when electricity is supplied while exposed to water and moisture during the cooking process. The purpose is to provide a cooking device with improved heating control and grinding efficiency that can prevent it from occurring only in the control circuit and component elements.

Another object of the present invention is to provide a cooking appliance with improved heating control and grinding efficiency in which the user can easily replace the zero crossing detector where insulation breakdown occurs even when electricity is supplied while exposed to water and moisture by manual operation. It is for.

Another object of the present invention is to precisely control the power generator (M) or heating device (H) at low cost, and to provide a heating control and The purpose is to provide a cooking device with improved grinding efficiency.

An additional object of the present invention is to provide a cooking appliance with improved heating control and grinding efficiency that can convert the output voltage of a processor into a stable and economical half-wave voltage using a bias circuit and provide it to an output unit.

The cooking appliance with improved heating control and grinding efficiency according to the present invention includes a container portion including a cooking container and a grinding blade, and a power source that is attached to and detached from the container portion and rotates the grinding blade with a preset rotational force. In a cooking appliance including a main body provided with a generator and a heating device for heating the cooking vessel,

A first power supply unit 20 installed in the main body and converting an externally supplied alternating current voltage into a preset first direct current voltage value and outputting it;

A second power unit 30 installed in the main body to be separated from the first power unit 20 and converting the alternating current voltage into a second direct current voltage value that is relatively larger or smaller than the first direct current voltage value and outputting it. ;

a zero crossing detection unit 50 installed in the main body, which detects each zero crossing point (0 crossing point) of the AC voltage and outputs it as a preset switching signal;

It is installed in the main body, driven by a first direct current voltage supplied from the first power unit 20, and used to control the cooking operation of the cooking appliance according to the user's cooking command or cooking settings through the operation unit 70. a processor unit 80 that outputs a control signal in synchronization with the zero crossing point provided by the zero crossing detection unit 50;

A device installed in the main body and selectively outputting a second bias voltage when a preset logic combination of the first direct current voltage supplied from the first power supply unit 20 and the output voltage of the processor unit 80 is satisfied. 2 bias circuit unit 90;

The heating device or the power generator is installed in the main body and is electrically connected to the inside of the main body according to a logic combination of the preset output voltage of the second bias circuit 90 and the processor 80. It is characterized by being composed of an output unit 100 that controls driving by switching.

According to the present invention, by applying a zero crossing detector and an independent power source, even if electricity is supplied while exposed to water and moisture during the cooking process, insulation breakdown occurs only in a limited area and does not spread to the entire control circuit and component elements. This has the effect of preventing breakdowns in advance.

In addition, even if electricity is supplied while exposed to water and moisture, the user can easily replace the zero-crossing detector that has suffered insulation breakdown by manual operation, making repairs easy and inexpensive even for non-experts. This has the effect of economically managing overall maintenance and management costs.

In addition, the power generator (M) or heating device (H) can be precisely controlled at a low cost, and the efficiency of the power generator (M) or heating device (H) can be improved, preventing breakdown of cooking appliances. Not only that, it has the effect of improving the reliability of cooking appliances.

In addition, the output voltage of the processor can be converted to a stable and economical half-wave voltage using a bias circuit and provided to the output unit, so that the operation of the output unit can be kept stable from overvoltage or overcurrent while reducing total power consumption. It has an effect.

1 is a block diagram of the main body of a cooking appliance with improved heating control and grinding efficiency according to a preferred embodiment of the present invention.
Figures 2 and 3 are circuit diagrams of main parts of the main body of the cooking appliance shown in Figure 1 with improved heating control and grinding efficiency.
Figure 4 is a detailed circuit diagram of a cooking appliance with improved heating control and grinding efficiency according to a preferred embodiment.
Figure 5 is a detailed circuit diagram of the processor unit shown in Figure 1.
Figure 6 is a block diagram of a cooking appliance output unit with improved heating control and grinding efficiency according to a preferred embodiment of the present invention.
Figure 7 is a circuit diagram of a cooking appliance output unit with improved heating control and grinding efficiency according to a preferred embodiment of the present invention.
Figure 8 is a block diagram of the main parts of a cooking appliance with improved heating control and grinding efficiency using electronic semiconductor devices.

The present invention for achieving the above-described object is described in detail with the accompanying drawings as follows, and detailed descriptions of well-known components that may unnecessarily obscure the gist of the present invention are omitted, and the configuration circuit diagram generally shows Known components are not shown and detailed descriptions are omitted.

Figure 1 is a block diagram of the cooking appliance main body with improved heating control and grinding efficiency according to a preferred embodiment of the present invention, and Figures 2 and 3 are block diagrams of the cooking appliance main body with improved heating control and grinding efficiency shown in Figure 1. This is a circuit diagram for the main part.

Referring to FIG. 1, a cooking appliance with improved heating control and grinding efficiency using electromagnetic induction current according to a preferred embodiment of the present invention includes a container portion including a cooking container and a grinding blade, and a container portion that is attached to and detached from the container portion, It consists of a main body equipped with a power generator (M) that rotates the grinding blade with a preset rotational force and a heating device (H) that heats the cooking vessel.

The main body unit includes a first power unit 20 that is installed in the main body unit and converts an externally supplied alternating voltage of 220 to 230 V into a preset first direct current voltage value using an electromagnetic induction current or an electronic semiconductor element and outputs it; It is installed in the main body to be separated from the first power supply unit 20, and converts the alternating current voltage into a second direct current voltage value that is relatively larger or smaller than the first direct current voltage value using electromagnetic induction current or electronic semiconductor elements and outputs it. 2 power supply unit 30; a zero crossing detection unit 50 installed in the main body, which detects each zero crossing point (0 crossing point) of the AC voltage and outputs it as a preset switching signal; It is installed in the main body, driven by the first direct current voltage supplied from the first power unit 20, and sends a control signal to control the cooking operation of the cooking device according to the user's cooking command or cooking settings through the operation unit 70. a processor unit 80 that outputs output in synchronization with the zero crossing point provided by the zero crossing detection unit 50; a second bias circuit unit 90 installed in the main body and selectively outputting a second bias voltage when the combination of the first direct current voltage supplied from the first power unit 20 and the output voltage of the processor unit 80 is satisfied; It is installed in the main body and switches the operation of the power generator (M) or heating device (H) installed to be electrically connected to the inside of the main body according to the combination of the output voltage of the second bias circuit unit 90 and the processor 80. A controlling output unit 100; A detection unit 40 that includes at least one sensor installed in a selective combination in the container or main body, and converts the sensing value detected by each sensor into a voltage signal and outputs it; It is installed in the main body and consists of a first bias circuit unit 60 that outputs a first bias voltage to the processor unit 80 according to the voltage output from the sensing unit 40.

Here, the processor unit 80 can selectively output a control signal or a cooking progress guidance signal for controlling the operation of the power generator (M) or the heating device (H) according to the voltage output from the first bias circuit unit 60. You can.

Here, the first power supply unit 20 and the second power supply unit 30 are separately configured independent power sources, and each separately receives an external power source 10 that supplies alternating current power to use a preset stable first power source V1 or a second power source. It can be output as (V2), where the first power unit 20 consists of a first power coil (L1) and a first rectifier unit 120, and the second power unit 30 consists of a second power coil (L2) and a first rectifier unit 120. It consists of 2 rectifier units (130).

Here, the first or second power coils (L1, L2) constituting each independent power source may be formed in a variable coil structure, may be variably configured in various ways, including semiconductors using diodes and constant voltage transistors (CTs), or SMPS. It can also be used as an electronic semiconductor device instead of a relay to control the power generator (M) and heating device (H) relatively simply.

Meanwhile, when using an economically efficient AC motor among the power generators (M) to perform the grinding process before or after the heating process in a cooking appliance, it is desirable to use the zero crossing detector 50 to maintain a constant speed and output.

In the present invention, the zero crossing detection unit 50 uses a photocoupler that combines electrical signals into light by taking advantage of the fact that the light emitting unit and the light receiving unit are electrically insulated from each other, and can be separated or connected by manual manipulation by the user. It is preferable to connect to the processor unit 80 using a wire connector. The reason for using an electrical connector like this is to facilitate the replacement of parts in case they are easily damaged due to insulation because the zero crossing detector 50 applies AC, i.e. high voltage, to the transmitting end and DC, i.e. low voltage, to the receiving end. am. Light emitting diodes, tungsten lamps, neon lamps, etc. can be used in such light emitting parts, and silicon avalanche photodiodes, pin diodes, cadmium sulfide, cadmium selenium, etc. can be used in the light receiving parts.

That is, the zero crossing detection unit 50 detects the position (zero crossing point) where the alternating current voltage in the form of a sine wave such as +V -> 0V -> -V applied through the AC circuit unit 10 is 0V, and the detected position Information is transmitted to the processor unit 80, and when the signal applied to the zero crossing unit 50 is a sine wave, as shown in FIG. 2, when a + voltage is applied to the diode terminal 1, the diode D2 conducts. Use the principle of

Meanwhile, when controlling the operation of the power generator (M), the processor unit 80 receives the zero crossing position information detected by the zero crossing detection unit 50, and the phase of the AC voltage provided by the AC circuit unit 10 Control to apply the drive control signal of the power generator (M) at the point of 0V.

The reason for applying the drive control signal in this manner is that when the drive control signal of the power generator (M) is randomly applied without considering the phase of the AC voltage, when the AC current rises or falls rapidly, the surrounding electrons This is to prevent unstable operation of the AC motor by causing strong noise in the circuit.

And the power generator (M) detects the volume of the cooking material to be pulverized or the weight of the cooking material using a weight sensor or an infrared sensor, and the processor unit 80 sets the pulverizing time to be relatively shorter or shorter than the reference time. It can be adjusted automatically for a long time, or manually by the user's manual operation.

In a preferred embodiment of the present invention, when the processor unit 80 controls the driving of the power generator (M), it receives the zero crossing position information detected by the zero crossing detection unit 50 and determines the rotation speed of the power generator (M). You can set it to perform the function of stirring the ingredients inside the cooking vessel by controlling it to the relatively lowest level.

Meanwhile, the detection unit 40 having at least one sensor is installed inside the cooking vessel or inside or outside the main body, and is used to detect the condition inside the cooking vessel. In a preferred embodiment of the present invention, the detection unit 40 is installed inside the cooking vessel or inside or outside the main body. A bubble detection sensor to detect overflow, a temperature detection sensor to detect the temperature inside the cooking vessel, a water level detection sensor to detect the water storage condition inside the cooking vessel, and a detection of the weight of the contents inside the cooking vessel. A weight detection sensor may optionally be included, but is not limited thereto.

In addition, the temperature sensor or water level sensor notifies the process unit 80 when the internal temperature of the cooking vessel rises more rapidly than the set time, and the process unit 80 recognizes it as a dangerous situation and stores a pre-stored alarm. (or alarm signal) can be controlled to prevent fires and safety accidents.

Additionally, there may be more than one sensor for detecting physical characteristics inside the cooking appliance. For example, two temperature sensors may be installed inside the cooking vessel to detect temperatures at different locations. On the other hand, one sensor can detect two or more physical quantities, and temperature and foam generation can be detected simultaneously by one sensor. Various types of sensors may be installed inside the cooking vessel, and each sensor may convert the sensed information into an electrical signal and transmit it to the processor unit 80, respectively.

In addition, the first bias circuit 60 electrically connected to the sensing unit 40 is a fixed bias circuit using fixed resistors (R6, R7), a capacitor (C2), and a transistor (Q2), as shown in FIG. 3. , the input power voltage is lowered with a bias resistance, and the switching is controlled so that the base current flows. The circuit is simple, a significant error is allowed in the bias resistance, and the circuit loss is low.

Here, the detection unit 40 has a negative characteristic, so when the ambient temperature rises, the resistance value of both ends drops, and when the ambient temperature falls, the resistance value rises to increase the base terminal voltage (V2) of the transistor (Q2) of the first bias circuit unit (60). The transistor (Q2) can be turned on or off depending on the resistance values of the resistors (R6 and R7). If the transistor (Q2) is turned on, the output of the processor unit 80 may change as the collector terminal voltage changes, and if the transistor (Q2) is turned off, the emitter terminal and the collector terminal are not conductive, so the processor portion ( The input terminal of 80) can maintain its initial state because there is no change in input voltage.

In addition, the processor unit 80, which is composed of hardware and software, heats or grinds the contents inside the cooking vessel according to the user's cooking command or settings in the cooking appliance, as shown in FIGS. 1 to 5. When the conditions of various internal or external sensors change and the function of processing or processing the cooking operation, the voltage converted by the resistance value of each sensor is input and the power generator (M) or heating device ( The operation of H) can be controlled.

Additionally, the second bias circuit unit 90 is composed of resistors (R4, R5), a capacitor (C1), and a transistor (Q1), and the polarity of the transistor may change direction depending on the circuit design.

In addition, the output unit 100 is connected in series with each other, as shown in FIGS. 6 and 7, in order to output the total power consumption or a half-wave voltage under the control of the processor unit 80, and outputs the applied voltage waveform. It is connected in parallel to the first and second relay contacts (RY1, RY2), which attenuate and output half-wave output, and the second relay contact point (RY2), and the output of the first and second relay contacts (RY1, RY2) is attenuated to half-wave output. It consists of a diode (D5) that rectifies and outputs, and the diode (D5) allows current to flow in only one direction, ultimately allowing only 1/2 output.

In addition, the first and second relay contacts (RY1, RY2) are connected to the transistors (Q3, Q4), the resistors (R8, R9) connected to the base terminals of the transistors (Q3, Q4), and the emitters of the transistors (Q3, Q4). It consists of diodes (D12, D11) for stabilizing the relay connected in parallel to the terminal and the first and second relays (RY ₁ , RY ₂ ). The diodes (D12, D11) prevent back electromotive force from flowing when current flows through the solenoid. In this case, since the diode is connected in parallel with the solenoid, it is intended to prevent the flow of back electromotive force.

Meanwhile, the output unit 100 operates when the input value reaches a certain value to control the operation of other circuits in order to control the operation of the heater or power generator with only a switch, and can control the operation of other circuits, such as relays with contact points, thermal ) Relays, pressure relays, and optical relays may be used, and as shown in FIG. 8, triacs, SCRs, etc. using electronic semiconductor devices that can control voltage more easily and inexpensively than transistors can be used.

That is, if this is explained through FIG. 8, the gate of the first triac (TA1) is connected to the output of the processor unit 80, the power generator (M) is connected to the output terminal, and the gate of the second triac (TA2) is connected to the output terminal. The end is connected to the output of the processor unit 80, and the output end is connected to the heating device (H), so that the power generator (M) or the heating device (H) is switched in two directions under the control of the processor unit 80. You can control it. In this way, when a triac is provided instead of using the second bias circuit unit 90 equipped with a relay, not only can the total number of parts be reduced, but this has the advantage of allowing the cooking appliance to be configured compactly.

In the present invention, the zero crossing detection unit 50 may be connected to the processor unit 80 using an electrical connector, or may be connected to the processor unit 80 using a connection structure that is detachable by the user. Accordingly, even when the zero crossing detection unit 50 needs to be replaced due to overcurrent or overvoltage, it has the advantage of being easily performed even by non-experts.

Meanwhile, although not shown in the drawing, the upper surface of the main body of the cooking vessel is vertically oriented to prevent water overflowing from the cooking vessel or spilled due to the user's carelessness from flowing into the main body and causing an electrical safety accident. A drain may be formed that penetrates and connects to the outside.

Hereinafter, the operation of a cooking appliance with improved heating control and grinding efficiency according to a preferred embodiment of the present invention will be described with reference to the attached drawings.

First, commercial power of 220 to 230V supplied from the outside is applied to the AC circuit unit 10, stabilized as power with a uniform voltage, and then applied to the first power unit 20 and the second power unit 30, respectively.

Accordingly, when the first power supply unit 20 is in a conductive state, the first power supply (V1) is supplied to the processor unit 80, and the second power supply unit 30 supplies the second power supply (V2) to the output unit 100. You can.

At this time, the user can apply a desired cooking command or set a cooking command, and the processor unit 80 can detect this and immediately execute the command, or remember the set command and count the time to execute it at the set time.

<Crushing operation>

Meanwhile, when the cooking device grinds the cooking ingredients contained inside the cooking container according to the user's cooking command or cooking settings, the processor unit 80 first determines the AC voltage detected by the zero crossing detection unit 50. The zero crossing point information can be received, and the drive control signal of the power generator (M) can be applied to be synchronized with the point in time when the phase of the alternating current voltage is 0V by referring to the zero crossing point information.

To describe the operation of the zero crossing detection unit 50 at this time in detail, when the sine wave current output from the AC circuit unit 10 is used as the operating voltage of the drive generator (M), the maximum output is reached until it approaches the peak of the sine wave. However, when the sine wave decreases from the peak and is close to 0, there is a problem in that the instantaneous speed of the drive generator (M) is lowered because a low voltage is momentarily supplied to the drive generator (M). Therefore, the processor 80 operates when the sine wave is close to 0. That is, whenever a sine wave matching the polarity of the light emitting diode D2 is applied, the light emitting diode D2 conducts and sends a signal to the receiving end, so that the switching element at the receiving end is turned on and the processor unit 80 can be operated. That is, when the sine wave is close to 0, the drive control signal of the drive generator (M) is output from the processor unit 80, so that the drive speed of the drive generator (M) can be kept constant and stable.

Accordingly, when the processor unit 80 controls the operation of the power generator (M) through the second bias circuit unit 90 and the output unit 100, the alternating current does not turn on and off suddenly, so it does not affect surrounding electronic circuits, etc. Not only can the conventional disadvantage of causing strong noise be eliminated, but the operation control timing of the power generator (M) can be controlled more precisely than before, thereby improving the overall efficiency and stability of the power generator (M).

In addition, the process unit 80 uses a zero value to improve the grinding efficiency of the power generator (M) according to the amount or weight of the cooking material contained inside the cooking vessel according to the detection value detected by the sensor of the detection unit 40. The grinding efficiency can be improved by adjusting the output grinding speed of the power generator (M) in multiple stages using the crossing control and phase control signals. In a preferred embodiment of the present invention, the speed is set differentially for each stage in the range of 1 to 9. Speed can be adjusted within the range.

Accordingly, power supply switching is controlled through the zero crossing detection unit 50, so that safety accidents do not occur even when exposed to water and moisture during the cooking process, and the processor unit is protected from overcurrent and overvoltage by using the zero crossing detection unit and independent power supply. You can.

<Heating operation>

Meanwhile, each sensor of the detection unit 40 detects a preset detection value and transmits it to the first bias circuit 60, and at this time, the first bias circuit 60 has a bias resistance ( It operates to turn on or off depending on the resistance values of R6 and R7) and the base voltage of the transistor (Q2). Accordingly, the processor unit 80 can output a control signal for controlling the second bias circuit unit 90 in the form of a digital signal according to the voltage value transmitted from each detection unit 40. The second bias circuit unit 90 ) and the output voltage of the processor 80 satisfies a specific logic combination, that is, when the output of the second bias circuit unit 90 is a high voltage and the output of the processor 80 is a high voltage, 2 The transistor (Q1) provided in the bias circuit unit (90) is turned on, and the output unit (100) operates normally to heat the heating device (H). At this time, one of the switching input voltages changes from a high voltage to a low voltage. When changed to , the operation can be repeatedly controlled to stop the heating operation of the heating device (H), and various power sources such as DC12V can be supplied to the power generator (M), heating device (H), and relay power.

Meanwhile, in the cooking start stage, when cooking first begins, because the cooking ingredients inside the cooking vessel must be cooked quickly, the processor 80 heats the cooking ingredients at the maximum output voltage even if the total power consumption is consumed, but in the completion stage of cooking, the processor 80 heats the cooking ingredients at the maximum output voltage. Alternatively, in the steaming stage, not only must the cooking ingredients be heated with relatively low power consumption, but half-wave rectification technology is required to reduce the total power consumption by half to prevent the foam generated inside the cooking vessel from overflowing during heating.

To implement this, as shown in Figures 6 and 7, two first and second relay contacts (RY1, RY2) are connected in series, and a diode (D5) is connected in parallel to the second relay contact point (RY2). When the electrical signal is +, the current is controlled not to flow in the second relay (RY2), and at this time, the processor unit 80 outputs at the maximum output voltage so that the total power consumption is consumed, or generates a half-wave of 1/2 of the total power consumption. Controls the voltage to be output.

To explain this in detail with reference to FIG. 7, a signal is transmitted from the output terminal of the processor 80 to the switching transistors (Q3 and Q4) through resistors (R8 and R9). The base terminals of the switching transistors (Q3 and Q4) Depending on the signal voltage applied, the switching transistors (Q3 and Q4) may be turned on or off. When the switching transistors (Q3 and Q4) are turned on, the collector terminal and emitter terminal are connected to the applied voltage (V2). The first and second relays (RY ₁ , RY ₂ ) are controlled not to be connected, and conversely, when the switching transistors (Q3 and Q4) are turned off, the first and second relays (RY ₁ , RY ₂ ) are not connected. Control so that it does not occur.

According to the cooking appliance with improved heating control and grinding efficiency according to the present invention, the output voltage of the processor 80 can be converted to a stable voltage using the second bias circuit 90 and provided to the output unit 100. This has the advantage of stably maintaining the operation of the output unit 100 from overvoltage or overcurrent.

In addition, when power is supplied to the processor unit, the power supply is switched and controlled using light as a medium, so even if exposed to water and moisture during the cooking process, insulation breakdown occurs only in a limited area and does not spread to the entire control circuit and component elements including the processor unit. This prevents malfunctions in advance, and protects the processor from overcurrent and overvoltage by using the zero crossing detection unit and independent power supply. In addition, the zero crossing detection unit or bias circuit can be easily replaced, allowing non-experts to use it. Even so, it is not only easy to repair but also can be repaired at a low cost, so it has the advantage of being able to manage the overall maintenance and management costs economically.

The present invention described above is not limited to the above-described embodiments, as various substitutions and changes can be made by those skilled in the art without departing from the technical spirit of the present invention. .

AC circuit section (10)
First power unit (20)
Second power unit (30)
Sensing unit (40)
Zero crossing detection unit (50)
First bias circuit unit (60)
Control panel (70)
Processor unit (80)
Second bias circuit unit (90)
Output unit (100)
T: sensor
H: Heating device
M: power generator
RY1, RY2: Relay contact
RY ₁ , RY ₂ : Relay

Claims (7)

Cooking comprising a main body unit that is attached to and detachable from the container unit and has a power generator for rotating the grinding blade with a preset rotational force and a heating device that heats the cooking vessel. In the device,
A first power supply unit 20 installed in the main body and converting an externally supplied alternating current voltage into a preset first direct current voltage value and outputting it;
A second power unit 30 installed in the main body to be separated from the first power unit 20 and converting the alternating current voltage into a second direct current voltage value that is relatively larger or smaller than the first direct current voltage value and outputting it. ;
a zero crossing detection unit 50 installed in the main body, which detects each zero crossing point (0 crossing point) of the AC voltage and outputs it as a preset switching signal;
It is installed in the main body, driven by a first direct current voltage supplied from the first power unit 20, and used to control the cooking operation of the cooking appliance according to the user's cooking command or cooking settings through the operation unit 70. a processor unit 80 that outputs a control signal in synchronization with the zero crossing point provided by the zero crossing detection unit 50;
A device installed in the main body and selectively outputting a second bias voltage when a preset logic combination of the first direct current voltage supplied from the first power supply unit 20 and the output voltage of the processor unit 80 is satisfied. 2 bias circuit unit 90;
The heating device or the power generator is installed in the main body and is electrically connected to the inside of the main body according to a logic combination of the preset output voltage of the second bias circuit 90 and the processor 80. A cooking appliance with improved heating control and grinding efficiency, characterized in that it consists of an output unit (100) that controls switching operation.
According to paragraph 1,
a detection unit 40 that includes at least one sensor installed in a selective combination on the container unit or the main body unit, and converts the sensing value detected by each sensor into a voltage signal and outputs it;
It is installed in the main body and further includes a first bias circuit unit 60 that outputs a first bias voltage to the processor unit 80 according to the voltage output from the detection unit 40;
The processor unit 80 is characterized in that it selectively outputs a control signal or a cooking progress guidance signal for controlling the operation of the heating device or the power generator according to the voltage output from the first bias circuit unit 60. Cooking equipment with improved heating control and grinding efficiency.
According to paragraph 1,
A cooking appliance with improved heating control and grinding efficiency, characterized in that the zero crossing detection unit 50 is detachably connected to the processor unit 80 using a wire connector so that it can be detached or connected by the user.
According to paragraph 1,
When the cooking appliance is in a grinding mode in which the power generator (M) is driven, the processor unit 80 refers to the zero crossing point information transmitted through the zero crossing detection unit 50 and determines that the phase of the alternating current voltage is 0V. A cooking appliance with improved heating control and grinding efficiency, characterized in that the driving control signal of the power generator (M) is applied at the point in time.
According to paragraph 1,
The processor unit 80 uses a zero crossing control signal and a phase control signal to improve grinding efficiency according to the sensing value detected by at least one sensor installed in a selective combination in the container unit or the main body unit. A cooking appliance with improved heating control and grinding efficiency, characterized in that the output grinding speed of the power generator (M) is controlled to operate at a selected stage among preset multi-stage operations.
According to clause 5,
Heating control, characterized in that the processor unit 80 controls the lowest stage operation among the multi-stage operations to relatively lower the rotation speed of the power generator (M) to stir the ingredients inside the cooking vessel. and cooking equipment with improved grinding efficiency.
According to paragraph 1,
The output unit 100 is,
First and second relay contacts (RY1, RY2) connected in series with each other and outputting the attenuated voltage waveform applied under the control of the processor unit 80 to a preset half-wave voltage;
Heating control, characterized in that it is connected in parallel to the second relay contact point (RY2) and includes a diode (D5) that half-wave rectifies the output of the first and second relay contact points (RY1, RY2) and outputs the output. and cooking equipment with improved grinding efficiency.

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