CN102920357A - Working circuit of electronic oven - Google Patents

Abstract

A working circuit of an electric oven includes a main control circuit; a power supply circuit; a temperature detection circuit; a display output circuit; The increase and decrease adjustment, which includes the first output end of the rotation signal and the second output end of the rotation signal, the main control circuit includes the first receiving end of the encoder signal and the second receiving end of the encoder signal, and the second receiving end of the rotation signal of the encoder circuit An output end is connected to the first receiving end of the encoder signal, and a second output end of the rotation signal of the encoder circuit is connected to the second receiving end of the encoder signal. The advantage of the present invention is that: a separate encoder circuit is used to realize the increase and decrease control of temperature and time, and the operation parameters such as oven temperature and time can be set through the continuous rotation of the encoder knob, which not only improves the operating efficiency, but also realizes Stepless adjustment makes the operation quicker and more convenient.

Description

A working circuit of an electric oven

technical field

The invention relates to a control circuit, in particular to a working circuit of an electric oven.

Background technique

The electric oven is an electric heating appliance that uses the radiant heat emitted by the electric heating element to bake food. It is mainly composed of a cabinet, an electric heating element, a convection motor, and a cooling motor.

Traditional electric ovens generally have three control units: temperature control, function control and timing control. Most of these three control units are independently operated and controlled by mechanical switches. In order to display the current working status of the oven, the Around the operation switch, there are also marks showing the current working status of the operation unit. These marks are mostly designed with panel silk screen printing, but the display content of this panel silk screen design is limited, and interactive operation cannot be realized.

For example, the Chinese invention patent "A Kind of Oven Control Circuit" with the patent number ZL200910223137.2 that I applied for earlier discloses such an oven circuit, the selection of its function gear, the setting of time, and the setting of temperature are separated. Selection, lack of human-computer interaction, separate operation is very troublesome, and when setting the temperature by rotating the rheostat, since the rheostat can only rotate within an angle of 0 to 270 degrees, if you forcefully rotate to 270 degrees, it will be very difficult to continue to rotate It is easy to damage this device and affect the use of the entire oven. In addition, there are currently oven circuits that integrate the selection of function gears, the setting of time and temperature together. However, this integration method is realized by touching the buttons, and it is a bit slow to adjust the temperature and time. After working for a period of time, the temperature will rise, and the operator will feel a little hot when pressing the touch button on the glass panel, which is not suitable for children to operate.

Contents of the invention

The technical problem to be solved by the present invention is to provide a working circuit of an electric oven that can realize rapid adjustment of temperature and time and make the operation of the oven more convenient and simple in view of the above-mentioned prior art.

The technical solution adopted by the present invention to solve the above technical problems is: a working circuit of an electric oven, including

The main control circuit has a power supply input terminal, a function selection input terminal, a temperature sampling input terminal, a temperature control terminal, a display signal output terminal and a control signal output terminal;

A power supply circuit, connected to the power input terminal of the main control circuit, for providing the main control circuit with a working voltage;

The temperature detection circuit is used to detect the working temperature of the oven, including an input terminal, an output terminal and a feedback control terminal, wherein the input terminal of the temperature detection circuit is connected to a temperature sensor, and the output terminal of the temperature detection circuit is connected to the main The temperature sampling input terminal of the control circuit is connected, and the feedback control terminal of the temperature detection circuit is connected with the temperature control terminal of the main control circuit;

The display output circuit is used to display patterns or text information, the input end of the display circuit is connected with the display signal output end of the main control circuit, and the output end of the display circuit is connected with a liquid crystal display capable of displaying the pattern or text signals Screen;

A control output circuit, the input end of which is connected to the control signal output end of the main control circuit, the control output circuit controls the oven to stop working when the oven reaches the set working temperature and time;

A function selection circuit, the function selection circuit is used to detect the induction signal input by the touch button or the mechanical switch, and convert the induction signal into an input signal that can be processed by the main control circuit, the output terminal of the function selection circuit and The function selection input terminal of the main control circuit is connected;

It is characterized in that it also includes an encoder circuit for adjusting temperature and time, wherein the encoder circuit includes a first output terminal of a rotation signal and a second output terminal of a rotation signal, and the main control circuit It includes a first receiving end of an encoder signal and a second receiving end of an encoder signal, wherein the first output end of the rotation signal of the encoder circuit is connected to the first receiving end of the encoder signal of the main control circuit, and the The second output end of the rotation signal of the encoder circuit is connected to the second receiving end of the encoder signal of the main control circuit.

Preferably, the encoder circuit includes a first resistor, a second resistor, a first capacitor, a second capacitor and a first socket that can be connected to the encoder switch shaft, wherein the first socket of the first socket The first path of the terminal is connected back to the third terminal of the first socket after passing through the first capacitor, and the other path is used as the first output end of the rotation signal of the encoder circuit and the coding of the main control circuit. connected to the first receiver signal; the first terminal of the first socket is connected to the second terminal of the first socket after passing through the second capacitor, and the other one is used as the code The second output terminal of the rotation signal of the encoder circuit is connected to the second receiving terminal of the encoder signal of the main control circuit; the first terminal of the first socket is grounded in the third way; the second terminal of the first socket is grounded; One of the terminals is connected to the positive pole of the power supply through the first resistor, and the other is connected to the first output terminal of the rotation signal of the encoder circuit; the third terminal of the first socket is connected through the second resistor It is connected to the positive pole of the power supply, and the other path is grounded through the first capacitor.

In order to improve the safety of use, as a further preference, the oven control circuit also includes a sound output circuit, the main control circuit also includes a sound signal output terminal, the input terminal of the sound output circuit) and the main control circuit The sound signal output terminal of the control circuit is connected.

In order to improve the sound effect of the alarm element, preferably, the sound output circuit includes an NPN-type first triode, a PNP-type second triode, an NPN-type third triode, and a PNP-type fourth triode. , NPN fifth triode, PNP sixth triode, NPN seventh triode and alarm element, the sound output circuit also includes a first sound input end, a second sound input end, a third sound an input terminal and a trigger control terminal, the main control circuit includes a trigger signal input terminal, a first sound signal output terminal, a second sound signal output terminal and a third sound signal output terminal;

Wherein, the base of the first triode is connected to the first sound signal output end of the main control circuit as the first sound input terminal through the third resistor, and the emitter of the first triode Grounded, the collector of the first triode is connected to the base of the second triode through the fourth resistor; the emitter of the second triode is connected to the positive pole of the power supply, and the collector of the second triode The electrode is connected to the first input end of the alarm element through the fifth resistor; the base of the third triode is used as the second sound input end and the second sound input end of the main control circuit through the sixth resistor. The sound signal output terminal is connected, the emitter of the third triode is grounded, the collector of the third triode is connected with the base of the fourth triode through the seventh resistor; the fourth triode The emitter of the fourth triode is connected to the positive pole of the power supply, and the collector of the fourth triode is connected to the first input terminal of the alarm element through the eighth resistor; the base of the fifth triode is used as the third triode through the ninth resistor. The sound input end is connected to the third sound signal output end of the main control circuit, the emitter of the fifth triode is grounded, and the collector of the fifth triode is connected to the sixth triode through the tenth resistor. The base of the sixth triode is connected to the positive pole of the power supply, and the collector of the sixth triode is connected to the first input terminal of the alarm element through the eleventh resistor; the second of the alarm element The input terminal is connected to the collector of the seventh triode, the emitter of the seventh triode is grounded, the base of the seventh triode is input through the twelfth resistor and the trigger signal of the main control circuit end connected.

In order to prevent the operation instructions of the oven from disappearing after a sudden power failure, avoid the trouble of resetting the instructions after restarting the power supply, and improve the intelligence of the operation, as a preference, the working circuit of the electric oven also includes a power-off memory circuit for storing Operation information input to the main control circuit by the function selection input circuit, wherein the power-off memory circuit has a trigger input terminal and an information read-write terminal, and correspondingly, the main control circuit has a trigger output terminal and a communication terminal The trigger input end of the power-off memory circuit is connected to the trigger output end of the main control circuit, and the information read-write end of the power-off memory circuit is connected to the communication end of the main control circuit.

The power-off memory circuit can be various types of memory in the prior art. As a preference, simply, the power-off memory circuit includes a memory chip of model 24C02, and the memory chip has eight pins , the first pin, the second pin, the third pin and the fourth pin of the memory chip are connected together and one of them is grounded, and the other is connected to the positive pole of the power supply through the third capacitor; the fifth pin of the memory chip is The information read-write end, the fifth pin is connected to the communication end of the main control circuit through the fourteenth resistor; the sixth pin of the memory chip is the trigger input end, the sixth pin The pin is connected to the trigger output terminal of the main control circuit through the thirteenth resistor; the seventh pin of the memory chip is grounded, and the eighth pin of the memory chip is connected to the positive pole of the power supply.

Compared with the prior art, the advantage of the present invention is that a separate encoder circuit is used to realize the increase and decrease control of temperature and time, and after the user selects a different function mode, it can be set by the continuous rotation of the encoder knob Oven temperature, time and other operating parameters not only improve the operating efficiency, but also can realize stepless adjustment, which makes the operation faster and more convenient; secondly, the three-way parallel structure is adopted to control the alarm sound through different gating methods, compared with The original software-only control method has better sound effects.

Description of drawings

Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.

FIG. 2 is a circuit diagram of the main control circuit of the embodiment of the present invention.

FIG. 3 is a circuit diagram of an encoder circuit according to an embodiment of the present invention.

Fig. 4 is a circuit diagram of the sound output circuit of the embodiment of the present invention.

FIG. 5 is a circuit diagram of a power-off memory circuit according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 5, this embodiment discloses a working circuit for an electric oven. The oven adopts an electronic control method and realizes stepless adjustment through an encoder, so that the user can set the operating temperature and working time of the oven. The operation is faster and more convenient and simple.

The oven working circuit of the present embodiment includes:

The main control circuit 1 has a power supply input terminal 11, a function selection input terminal 12, a temperature sampling input terminal 13, a display signal output terminal 15, a control signal output terminal 16, an encoder signal first receiving end 171, and an encoder signal second receiving end Terminal 172, sound signal output terminal 18, trigger output terminal 191 and communication terminal 192, the main control circuit 1 is used to receive and process the information of each input terminal, and convert the information into patterns or characters output by display signal output terminal 15 signal and the control signal output through the control signal output terminal 16;

The power supply circuit 2 is connected to the power supply input terminal 11 of the main control circuit 1, and is used to provide the main control circuit 1 with a DC working voltage of +5V;

The temperature detection circuit 3 is used to detect the working temperature of the oven, including an input terminal 31 and an output terminal 32, wherein the input terminal 31 of the temperature detection circuit 3 is connected with a temperature sensor, and the output terminal 32 of the temperature detection circuit 3 is connected to the main control The temperature sampling input terminal 13 of the circuit 1 is connected;

The display output circuit 4 is used to display patterns or text information. The input end of the display circuit 4 is connected to the display signal output end 15 of the main control circuit 1, and the output end of the display circuit 4 is connected to a liquid crystal displaying pattern or text signals. display screen;

The control output circuit 5 has its input terminal 51 connected to the control signal output terminal 16 of the main control circuit 1, and controls the oven to stop working when the oven reaches the set working temperature and time;

Function selection circuit 6, the function selection circuit 6 is used to detect the induction signal input by the touch key or mechanical switch, and convert the induction signal into an input signal that can be processed by the main control circuit 1, the output terminal of the function selection circuit 6 and The function selection input terminal 12 of the main control circuit 1 is connected;

The encoder circuit 7 is used to realize the increase and decrease adjustment of temperature and time, wherein the encoder circuit 7 includes a first output terminal 71 of the rotation signal and a second output terminal 72 of the rotation signal, and the main control circuit 1 includes the first output terminal 72 of the encoder signal. A receiving end 171 and the second receiving end 172 of the encoder signal, and the first output end 71 of the rotation signal of the encoder circuit 7 is connected to the first receiving end 171 of the encoder signal of the main control circuit 1, and the rotation of the encoder circuit 7 The signal second output terminal 72 is connected to the encoder signal second receiving terminal 172 of the main control circuit 1;

Sound output circuit 8, this sound output circuit 8 has trigger control end, first sound signal input end, second sound signal input end and the 3rd sound signal input end, correspondingly, main control circuit 1 has trigger control end respectively , the trigger signal input end, the first sound signal output end, the second sound signal output end and the third sound signal output end connected correspondingly to the first sound signal input end, the second sound signal input end and the third sound signal input end, The alarm element is connected in series in the sound output circuit;

The power-off memory circuit 9 is used to store the operation information input from the function selection circuit 6 and the encoder circuit 7 to the main control circuit 1 (such as the working gear mode of the oven, heating time and corresponding temperature setting value, etc.), The power-off memory circuit 9 has a trigger input end 91 and an information read-write end 92, the trigger input end 91 of the power-off memory circuit 9 is connected to the trigger output end 191 of the main control circuit 1, and the information read-write end of the power-off memory circuit 9 92 is connected to the communication terminal 192 of the main control circuit 1.

Among the above-mentioned functional circuits, among them, the power supply circuit 2, the temperature detection circuit 3, the display output circuit 4, the control output circuit 5 and the function selection circuit 6 are all prior art, and can be realized by using various circuit connection structures in the prior art , which will not be described in detail here.

The main control circuit 1 of the present embodiment adopts the integrated chip IC1 of MB95470H model of Fujitsu. is +5V); the 7th to 12th pins and 15th pins of the integrated chip IC1 are the function selection input terminals 12; the 3rd pins of the integrated chip IC1 are the temperature sampling input terminals 13; the 25th to 28th pins and the 49th to Pin 63 is the display signal output terminal 15; pins 17-21 and pin 29 of the integrated chip IC1 are control signal output terminals 16 capable of controlling the relay action; pin 6 of the integrated chip IC1 is the first receiving end 171 of the encoder signal, the integrated chip Pin 5 of IC1 is the second receiving end 172 of the encoder signal; pins 30 to 32 of the integrated chip are the sound signal output end 18, which can be connected to the corresponding input end of the sound output circuit 8 when the oven fails to control The alarm element emits an alarm sound, and the 13-pin (T001) of the integrated chip IC1 is the trigger control terminal, which is used to control the on-off of the alarm element (buzzer). The trigger control terminal is always in the conduction state when the integrated chip IC1 is working normally , shut down after the integrated chip IC1 is powered off; pin 38 of the integrated chip IC1 is the trigger output terminal 191 , and pin 37 of the integrated chip IC1 is the communication terminal 192 .

The encoder circuit 7 of this embodiment includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a first socket CON1 that can be connected to the encoder switch shaft, wherein the first socket CON1 The first terminal of the first terminal of the first terminal passes through the first capacitor C1, and then one channel is connected back to the third terminal of the first socket CON1, and the other channel is used as the first output terminal 71 (T3) of the rotation signal of the encoder circuit 7 and the main control The encoder signal of circuit 1 is connected to the first receiving end 171 (6-pin of integrated chip IC1); The second terminal of the socket CON1 is connected to the second output terminal 72 (T4) of the rotation signal of the encoder circuit 7 and the second receiving terminal 172 of the encoder signal of the main control circuit 1 (pin 5 of the integrated chip IC1); The third way of the first terminal of the first socket CON1 is grounded; one of the second terminals of the first socket CON1 is connected to the positive pole of the power supply through the first resistor R1, and the other is connected to the first output of the rotation signal of the encoder circuit 7 On terminal 71; one of the third terminals of the first socket CON1 is connected to the positive pole of the power supply through the second resistor R2, and the other is grounded through the first capacitor C1.

The encoder circuit 7 of this embodiment can realize continuous stepless adjustment of temperature and time. The encoder of this embodiment adopts a cross-shaped encoder. When the user rotates the encoder knob, the rotation of the encoder circuit 7 The first output terminal 71 (T3) of the signal and the second output terminal 72 (T4) of the rotation signal respectively generate a circular square wave. When the encoder rotates clockwise, the output square wave of the first output terminal 71 (T3) of the rotation signal is 01100110 ..., the output square wave of the second output terminal 72 (T4) of the rotation signal is 00110011...; when the encoder rotates counterclockwise, the output square wave of the first output terminal 71 (T3) of the rotation signal is 00110011..., the second output terminal of the rotation signal 72 (T4) outputs a square wave of 01100110...; the integrated chip IC1 judges whether the user is turning the encoder and the direction of rotation of the encoder according to the combination of square wave models input from both ends of the 6th pin and the 5th pin. In order to determine whether the adjusted temperature or time is increasing or decreasing, the cross-shaped encoder of this embodiment can realize continuous rotation, thereby realizing stepless adjustment of temperature or time.

The sound output circuit 8 of this embodiment includes an NPN type first transistor Q1, a PNP type second transistor Q2, an NPN type third transistor Q3, a PNP type fourth transistor Q4, and an NPN type fifth transistor Q4. Transistor Q5, PNP sixth triode Q6, NPN seventh triode Q7 and alarm element BUZZ (buzzer), the sound output circuit 8 also includes a first sound signal input terminal PA5, a second The sound signal input terminal PA6, the third sound signal input terminal PA7 and the trigger control terminal T001, the sound signal output end 18 of the main control circuit 1 corresponds to the first sound signal output end (30 pins of the integrated chip IC1), the second sound signal Output terminal (pin 31 of the integrated chip IC1) and a third sound signal output terminal (pin 32 of the integrated chip IC1), the main control circuit 1 also has a trigger signal input that can be connected to the trigger control terminal T001 of the sound output circuit 8 Terminal (pin 13 of integrated chip IC1);

Wherein, the base of the first triode Q1 is connected to pin 30 of the integrated chip IC1 as the first sound signal input terminal PA5 after passing through the third resistor R3, the emitter of the first triode Q1 is grounded, and the first triode The collector of Q1 is connected to the base of the second transistor Q2 through the fourth resistor R4; the emitter of the second transistor Q2 is connected to the positive pole of the power supply, and the collector of the second transistor Q2 is connected to the alarm through the fifth resistor R5 The first input terminal of the component BUZZ is connected; the base of the third triode Q3 is connected to the 31 pin of the integrated chip IC1 as the second sound signal input terminal PA6 after passing through the sixth resistor R6, and the emitter of the third triode Q3 Grounded, the collector of the third transistor Q3 is connected to the base of the fourth transistor Q4 through the seventh resistor R7; the emitter of the fourth transistor Q4 is connected to the positive pole of the power supply, and the collector of the fourth transistor Q4 The first input end of the alarm element BUZZ is connected through the eighth resistor R8; the base of the fifth triode Q5 is connected with the 32 pin of the integrated chip IC1 as the third sound signal input end PA7 through the ninth resistor R9, and the fifth and third The emitter of the transistor Q5 is grounded, the collector of the fifth transistor Q5 is connected to the base of the sixth transistor Q6 through the tenth resistor R10; the emitter of the sixth transistor Q6 is connected to the positive pole of the power supply, and the sixth and third The collector of the pole tube Q6 is connected to the first input end of the alarm element BUZZ through the eleventh resistor R11; the second input end of the alarm element BUZZ is connected to the collector of the seventh triode Q7, and the seventh triode Q7 The emitter is grounded, and the base of the seventh triode Q7 is connected to pin 13 of the integrated chip IC1 through the twelfth resistor R12. The sound output circuit 8 of the present embodiment is mainly controlled by hardware, and three different sound effects can be produced through different gates of the first three parallel circuits of the alarm element BUZZ, which are much better than the sound effects of pure software debugging.

The working circuit of the electric oven in this embodiment also includes a power-off memory circuit 9. The power-off memory circuit 9 is based on a memory chip IC2 with a model number of 24C02. The memory chip IC2 has eight pins, and the memory chip IC2 has eight pins. One pin A0, the second pin A1, the third pin A2 and the fourth pin GND are connected together, and one path is grounded, and the other path is connected to the positive pole of the power supply through the third capacitor C3; the fifth pin SDL of the memory chip IC2 is It is the information read-write terminal 92 of the power-off memory circuit 9, the fifth pin SDA is connected to the 37 pin (communication terminal 192) of the integrated chip IC1 through the fourteenth resistor R14; the sixth pin SCL of the memory chip IC2 is The trigger input terminal 91 of the power-off memory circuit 9, the sixth pin SCL is connected to the 38 pin (trigger output terminal 191) of the integrated chip IC1 through the thirteenth resistor R13; the seventh pin WP of the memory chip IC2 is grounded, and the memory chip The eighth pin Vcc of IC2 is connected to the positive pole of the power supply.

When the oven is restarted after a sudden power failure, the integrated chip IC1 will send a trigger signal to the trigger input end 91 of the storage chip IC2 via pin 38 (trigger output terminal 191), and then the integrated chip IC1 can receive information from the storage chip IC2 The read-write terminal 92 reads the previously set function parameters (such as heating time, mode, heating temperature, etc.), and continues to process food according to the previously set mode.

In the oven working circuit of this embodiment, an encoder circuit 7 is added to the traditional control circuit, so that after the function mode is selected, the user can realize the setting of temperature and time as long as the encoder knob is turned continuously, so that the temperature And the increase and decrease operation of time is more convenient; Simultaneously, the oven operating circuit of the present embodiment has improved original sound output circuit 8, mainly realizes sound output with hardware control, has greatly improved the sound effect of alarm element; In addition, power failure The memory circuit 9 can memorize the working gear mode of the oven and the corresponding temperature and time setting values. Manual reset makes the oven work smarter.

Claims (6)

1. the operating circuit of an electric oven includes

Governor circuit (1) has power input (11), function selection input (12), temperature sampling input (13), display output (15) and control signal output (16);

Power circuit (2) is connected to the power input (11) of described governor circuit (1), is used for providing operating voltage to this governor circuit (1);

Temperature sensing circuit (3), operating temperature for detection of baking box, include input (31) and output (32), wherein, the input (31) of described temperature sensing circuit (3) is connected with temperature sensor, and the output (32) of this temperature sensing circuit (3) links to each other with the temperature sampling input (13) of described governor circuit (1);

Display output circuit (4), be used for display pattern or Word message, the display output (15) of the input of this display circuit (4) and described governor circuit (1) links to each other, and the output of this display circuit (4) is connected with the LCDs that can show described pattern or letter signal;

Control output circuit (5), the control signal output (16) of its input (51) and described governor circuit (1) links to each other, this control output circuit (5) reaches under the operating temperature and the state of time of setting at baking box, controls this baking box and quits work;

Function selector circuit (6), this function selector circuit (3) is for detection of the induced signal by touch key-press or mechanical switch input, and this induced signal is converted to the input signal that can process for described governor circuit (1), the function of the output of described function selector circuit (3) and described governor circuit (1) selects input (12) to link to each other;

It is characterized in that: also include encoder circuit (7), be used for realizing the increase and decrease adjusting of temperature and time, wherein, described encoder circuit (7) includes turn signal the first output (71) and turn signal the second output (72), described governor circuit (1) includes code device signal the first receiving terminal (171) and code device signal the second receiving terminal (172), wherein, turn signal first output (71) of described encoder circuit (7) links to each other with code device signal first receiving terminal (171) of described governor circuit (1), and turn signal second output (72) of described encoder circuit (7) links to each other with code device signal second receiving terminal (172) of described governor circuit (1).

2. the operating circuit of electric oven according to claim 1, it is characterized in that: described encoder circuit (7) includes the first resistance (R1), the second resistance (R2), the first electric capacity (C1), the second electric capacity (C2) and first plug receptacle (CON1) that can connect the coder switch rotating shaft, wherein, the first terminals first via of described the first plug receptacle (CON1) takes back the 3rd terminals of this first plug receptacle (CON1) through described the first electric capacity (C1) Hou Yilu, another road links to each other as turn signal first output (71) of described encoder circuit (7) and code device signal first receiving terminal (171) of described governor circuit (1); The first terminals the second tunnel of described the first plug receptacle (CON1) take back the second terminals of this first plug receptacle (CON1) through described the second electric capacity (C2) Hou Yilu, another road links to each other as turn signal second output (72) of described encoder circuit (7) and code device signal second receiving terminal (172) of described governor circuit (1); The first terminals Third Road ground connection of described the first plug receptacle (CON1); A road of the second terminals of described the first plug receptacle (CON1) link to each other with positive source through described the first resistance (R1), and another road is connected on turn signal first output (71) of described encoder circuit (7); The 3rd terminals one tunnel of described the first plug receptacle (CON1) link to each other with positive source through described the second resistance (R2), and another road is through described the first electric capacity (C1) ground connection.

3. the operating circuit of electric oven according to claim 1, it is characterized in that: described control circuit of oven also includes sound out-put circuit (8), described governor circuit (1) also includes audio signal output terminal (18), and the audio signal output terminal (18) of the input of described sound out-put circuit (8) and described governor circuit (1) links to each other.

4. the operating circuit of electric oven according to claim 3, it is characterized in that: described sound out-put circuit (8) includes NPN type the first triode (Q1), positive-negative-positive the second triode (Q2), NPN type the 3rd triode (Q3), positive-negative-positive the 4th triode (Q4), NPN type the 5th triode (Q5), positive-negative-positive the 6th triode (Q6), NPN type the 7th triode (Q7) and alarm element (BUZZ), this sound out-put circuit (8) also includes first sound tone signal input (PA5), second sound signal input (PA6), the 3rd voice signal input (PA7) and trigger control end (T001), the audio signal output terminal (18) of described governor circuit (1) is to there being first sound tone signal output, second sound signal output and the 3rd audio signal output terminal, this governor circuit (1) also have the triggering signal input that can be connected with the trigger control end (T001) of sound out-put circuit (8);

Wherein, the base stage of described the first triode (Q1) links to each other as first audio signal output terminal of described first sound tone signal input (PA5) with described governor circuit (1) behind the 3rd resistance (R3), the grounded emitter of this first triode (Q1), the colelctor electrode of this first triode (Q1) links to each other through the base stage of the 4th resistance (R4) with described the second triode (Q2); The emitter stage of described the second triode (Q2) connects positive source, and the colelctor electrode of this second triode (Q2) links to each other through the first input end of the 5th resistance (R5) with described alarm element (BUZZ); The base stage of described the 3rd triode (Q3) links to each other as the second sound signal output of described second sound signal input (PA6) with described governor circuit (1) behind the 6th resistance (R6), the grounded emitter of the 3rd triode (Q3), the colelctor electrode of the 3rd triode (Q3) links to each other through the base stage of the 7th resistance (R7) with described the 4th triode (Q4); The emitter stage of described the 4th triode (Q4) connects positive source, and the colelctor electrode of the 4th triode (Q4) connects the first input end of alarm element (BUZZ) through the 8th resistance (R8); The base stage of described the 5th triode (Q5) links to each other as the 3rd audio signal output terminal of described the 3rd voice signal input (PA7) and described governor circuit (1) behind the 9th resistance (R9), the grounded emitter of the 5th triode (Q5), the colelctor electrode of the 5th triode (Q5) links to each other through the base stage of the tenth resistance (R10) with described the 6th triode (Q6); The emitter stage of described the 6th triode (Q6) connects positive source, and the colelctor electrode of the 6th triode (Q6) links to each other through the first input end of the 11 resistance (R11) with alarm element (BUZZ); The second input of described alarm element (BUZZ) links to each other with the colelctor electrode of described the 7th triode (Q7), the grounded emitter of the 7th triode (Q7), the base stage of the 7th triode (Q7) links to each other through the triggering signal input of the 12 resistance (R12) with described governor circuit (1).

5. the operating circuit of electric oven according to claim 1, it is characterized in that: the operating circuit of described electric oven also includes circuit-breaking memory circuit (9), being used for storage selects input circuit (6) to input to the operation information of described governor circuit (1) by function, wherein, described circuit-breaking memory circuit (9) has triggering input (91) and Card read/write end (92), correspondingly, described governor circuit (1) has triggering output (191) and communication ends (192), the triggering input (91) of described circuit-breaking memory circuit (9) links to each other with the triggering output (191) of described governor circuit (1), and the Card read/write end (92) of described circuit-breaking memory circuit (9) and the communication ends (192) of described governor circuit (1) link to each other.

6. the operating circuit of electric oven according to claim 5, it is characterized in that: described circuit-breaking memory circuit (9) includes the storage chip that a model is 24C02 (IC2), described storage chip (IC2) has eight pins, one tunnel ground connection after first pin (A0) of this storage chip (IC2), the second pin (A1), three-prong (A2) and the 4th pin (GND) connect altogether, another Lu Jingdi three electric capacity (C3) connect positive source; The 5th pin (SDL) of this storage chip (IC2) is described Card read/write end (92), and the 5th pin (SDL) links to each other through the communication ends (192) of the 14 resistance (R14) and described governor circuit (1); The 6th pin (SCL) of this storage chip (IC2) is described triggering input (91), and the 6th pin (SCL) links to each other through the triggering output (191) of the 13 resistance (R13) and described governor circuit (1); The 7th pin (WP) ground connection of described storage chip (IC2), the 8th pin (Vcc) of this storage chip (IC2) connects described positive source.

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