WO2022227132A1

WO2022227132A1 - Display circuit, display apparatus, and cooking utensil

Info

Publication number: WO2022227132A1
Application number: PCT/CN2021/094306
Authority: WO
Inventors: 张梅
Original assignee: 广州斯腾电子实业有限公司
Priority date: 2021-04-25
Filing date: 2021-05-18
Publication date: 2022-11-03
Also published as: CN214964647U

Abstract

A display circuit, a display apparatus, and a cooking utensil. The display circuit comprises a printed circuit board (PCB) (1), and a temperature processing circuit (102) which is arranged on the PCB (1) and is electrically connected to a power supply board interface circuit (101), wherein the power supply board interface circuit (101), a digital display driver circuit (103), the temperature processing circuit (102) and a touch feedback circuit (104) are electrically connected to a main control chip (105). The digital display driver circuit (103) comprises an RGB lamp VD1 (1031), a display driver chip (1032), a Nixie tube driver chip (1033), and several LED lamps (1034), wherein the Nixie tube driver chip (1033) and the several LED lamps (1034) are electrically connected to the display driver chip (1032); and the RGB lamp VD1 (1031) and the display driver chip (1032) are electrically connected to the main control chip (105). The RGB lamp VD1 (1031) transforms into different colors in different cooking stages, so that a user can remotely recognize a cooking stage of a cooking utensil in a certain cooking mode. The display pattern is concise and beautiful, and thus facilitates use by the user.

Description

A display circuit, display device and cooking utensil

technical field

The utility model relates to the field of cooking utensils, in particular to a display circuit, a display device and a cooking utensil.

Background technique

With the development of science and technology, cooking utensils have also entered the era of intelligence, and users have also put forward higher requirements for cooking utensils. In order to improve the aesthetics, intelligence and interactive operation performance of the cooking utensils, the cooking utensils are generally equipped with display devices to display the working status of the cooking utensils, which is convenient for users to operate. At present, most of the display devices adopt the display mode of digital tube and LED light, and the fonts and symbols displayed are small in size, so users cannot see clearly at a long distance, and cannot identify the working state of the cooking utensils.

Therefore, in order to solve the above problems, the present invention designs a display circuit, a display device and a cooking utensil with such a display device, which are convenient for users to recognize the cooking state at a long distance.

Utility model content

In view of the above-mentioned technical problems, the present invention provides a display circuit, a display device and a cooking utensil. According to the first aspect of the disclosed embodiments of the present invention, a display circuit is provided, comprising: a PCB board and a display circuit arranged on the PCB board. The power supply board interface circuit, temperature processing circuit, digital display drive circuit, touch feedback circuit and main control chip on the upper The feedback circuit is electrically connected with the main control chip; the digital display drive circuit includes an RGB lamp VD1, a display drive chip, a digital tube drive chip and several LED lights. The digital tube drive chip and several LED lights are electrically connected with the display drive chip, and the RGB lights VD1, the display driver chip is electrically connected with the main control chip.

Further, the anode of the RGB lamp VD1 is connected to the +5V power supply, and the R pin, the G pin and the B pin of the RGB lamp VD1 are respectively connected to the main control chip through the resistor R34, the resistor R33 and the resistor R32.

Further, the temperature processing circuit includes thermistor RJ1, thermistor RJ2, resistor R23, resistor R31, capacitor C3 and capacitor C4, wherein:

The input end of the resistor R23 is connected to the power board interface circuit, the output end of the resistor R23 is connected to the main control chip, the input end of the thermistor RJ1 is connected to the +5V power supply, the output end of the thermistor RJ1 is connected to the input end of the resistor R23, and the capacitor The two ends of C3 are respectively connected to the output end of the end resistor R23 and the ground;

The input end of the resistor R31 is connected to the power board interface circuit, the output end of the resistor R31 is connected to the main control chip, the input end of the thermistor RJ2 is connected to the +5V power supply, the output end of the thermistor RJ2 is connected to the input end of the resistor R31, and the capacitor Both ends of C4 are respectively connected to the output end of the end resistor R31 and the ground.

Further, the display circuit also includes a data input signal protection circuit; the data input signal protection circuit includes: a resistor R35, a resistor R36 and a capacitor C5, the input end of the resistor R36 is connected to the main control chip, and the output end is connected to the display driver chip; the input of the resistor R35 The terminal is connected to the +5V power supply, and the output terminal is connected to the output terminal of the resistor R36; the two ends of the capacitor C5 are respectively connected to the output terminal of the resistor R36 and the ground.

Further, the display circuit also includes a clock input signal protection circuit; the clock input signal protection circuit includes: a resistor R37, a resistor R38 and a capacitor C7, the input end of the resistor R38 is connected to the main control chip, and the output end is connected to the display driver chip; the input of the resistor R37 The terminal is connected to the +5V power supply, and the output terminal is connected to the output terminal of the resistor R38; the two ends of the capacitor C7 are respectively connected to the output terminal of the resistor R38 and the ground.

Further, the display circuit also includes a buzzer circuit arranged on the PCB board; the buzzer circuit includes: a DC buzzer BUZ1, an electrolytic capacitor EC1, a transistor Q1, a transistor Q2, a transistor Q3, a capacitor C1, a resistor R1, a resistor R2, resistor R3, resistor R4, resistor R5 and resistor R6;

The input end of the resistor R6 is connected to the main control chip, the output end is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 and the base of the transistor Q1 are connected to the resistor R4, and the two ends of the resistor R3 are respectively connected Between the base stage and the emitter of the transistor Q1, the emitter of the transistor Q1 is connected to the +12V power supply, the two ends of the resistor R1 are respectively connected to the collector of the transistor Q1 and the positive electrode of the electrolytic capacitor EC1, the negative electrode of the electrolytic capacitor EC1 is grounded, and the resistor The two ends of R2 are respectively connected to the collector of transistor Q1 and the collector of transistor Q2, the emitter of transistor Q2 is grounded, the resistor R5 is connected in parallel with the capacitor C1, one end is connected to the main control chip, the other end is connected to the base level of the transistor Q2, the DC buzzer The device BUZ1 is connected between the collector of the transistor Q1 and the collector of the transistor Q2.

Further, the display circuit also includes a power-down memory circuit arranged on the PCB board;

The power-off memory circuit includes: electrolytic capacitor EC5, resistor R40, resistor R41 and diode D2, diode D2 is connected in parallel with resistor R40, resistor R41 is connected in parallel with electrolytic capacitor EC5, the positive electrode of diode D2 is connected to the main control chip, and the negative electrode is connected to the electrolytic capacitor EC5. The positive pole, the negative pole of the electrolytic capacitor EC5 is grounded.

In a second aspect of the disclosed embodiments of the present invention, a display device is provided, which includes the above-mentioned display circuit, and also includes a control panel and a lampshade; the control panel is covered on a PCB board, and includes reserved holes for buttons and/or RGB lights; The lampshade covers the RGB lamp VD1.

Further, the area of the lampshade is not less than 25mm ² .

A third aspect of the disclosed embodiments of the present invention provides a cooking utensil, which includes the above-mentioned display device, and also includes a cooking utensil body and a surface sticker, the PCB board is fixed on the cooking utensil body, and the surface sticker is attached to the control panel. The display circuit, the display device and the cooking utensil of the utility model can realize the status indication under different cooking modes, and have excellent visibility. Different colors can be changed at different stages of different cooking modes through the RGB lights, so that the user can be far away. The distance can identify the cooking stage of the cooking appliance, and the display method is simple and beautiful, which is convenient for users to use.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. It is obvious that the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a display circuit according to an embodiment of the present invention;

2 is a schematic structural diagram of a RGB lamp VD1 circuit shown in an embodiment of the present utility model;

3 is a schematic structural diagram of a temperature processing circuit according to an embodiment of the present invention;

4 is a schematic structural diagram of another temperature processing circuit shown in an embodiment of the present invention;

5 is a schematic structural diagram of a first voltage regulator circuit according to an embodiment of the present invention;

6 is a schematic structural diagram of a second voltage regulator circuit according to an embodiment of the present invention;

7 is a schematic structural diagram of a data input signal protection circuit according to an embodiment of the present invention;

8 is a schematic structural diagram of a clock input signal protection circuit according to an embodiment of the present invention;

9 is a schematic structural diagram of a buzzer circuit according to an embodiment of the present invention;

10 is a schematic structural diagram of a power-down memory circuit according to an embodiment of the present invention;

11 is a schematic structural diagram of a touch feedback circuit according to an embodiment of the present invention;

12 is a schematic structural diagram of a power board interface circuit according to an embodiment of the present invention;

13 is a schematic structural diagram of a digital tube driver chip according to an embodiment of the present invention;

14 is a schematic structural diagram of an LED lamp circuit according to an embodiment of the present invention;

15 is a schematic structural diagram of a display driver chip according to an embodiment of the present invention;

16 is a schematic structural diagram of a main control chip according to an embodiment of the present invention;

17 is a schematic structural diagram of a rice cooker shown in an embodiment of the present utility model;

Among them: 1-PCB board, 101-power board interface circuit, 102-temperature processing circuit, 103-digital display driver circuit, 1031-RGB lamp VD1, 1032-display driver chip, 1033-digital tube driver chip, 1034-LED lamp , 104-touch feedback circuit, 105-main control chip, 2-control panel; 201-button; 202-RGB lamp reserved hole, 3-lampshade, 4-cooking utensil body, 5-face sticker.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in FIGS. 1 to 17 , a display circuit shown in the disclosed embodiments of the present invention includes: a PCB board 1 , a control panel 2 and a lampshade 3 arranged on the PCB board 1 ; wherein, the power board interface circuit 101 , temperature processing circuit 102, digital display driving circuit 103, touch feedback circuit 104 and main control chip 105; temperature processing circuit 102 is electrically connected with power board interface circuit 101, power board interface circuit 101, digital display driving circuit 103, temperature processing circuit 102 and the touch feedback circuit 104 are electrically connected to the main control chip 105; the digital display drive circuit 103 includes an RGB lamp VD1 1031, a display drive chip 1032, a digital tube drive chip 1033 and a number of LED lights 1034, a digital tube drive chip 1033, a number of The LED lamp 1034 is electrically connected to the display driver chip 1032 , and the RGB lamp VD1 1031 and the display driver chip 1032 are electrically connected to the main control chip 105 .

The power board interface circuit 101 is connected to an external power supply to supply power to the device. After the device is powered on, the selected cooking function (eg, cooking) is touched by the touch feedback circuit 104. The touch feedback circuit 104 outputs the corresponding function signal to the main control chip 105. The main control chip 105 Generate corresponding control commands according to the preset program, and output control signals to the digital tube drive circuit 103, the cooking module (for example, control the electromagnetic coil/electric heating plate to directly heat the metal liner, or use the baking device and fan to form a vortex heat flow) , while heating the food and taking away moisture); the display drive chip 1032 in the digital display drive circuit 103 receives the signal, and outputs the display signal to the digital tube drive chip 1033 to display the cooking time required by the corresponding cooking function, and starts timing, and simultaneously outputs The display signal is displayed on the corresponding LED light 1034, and the LED light 1034 lights up to show the user that the cooking program is being executed; when the program is executed to a certain stage, the cooking time and the cooking temperature fed back by the temperature processing circuit 102 meet the preset threshold, the main The control chip 105 sends a state switching signal to the display driver chip 1032, the display driver chip 1032 outputs different voltages to the pins of the RGB lamp VD1 1031, and controls the RGB lamp VD1 1031 to display the corresponding color, so as to show the user different cooking states in real time .

As an implementation method, 14

LED lights

1034 and 22 function keys can be designed in this embodiment, corresponding to different functions of the cooking utensils, such as: cooking rice, soup, frying, stewing, keeping warm, turning on, off, etc. , as shown in FIG. 12 and FIG. 16 , the function keys may be physical keys or touch keys. The user can switch between different cooking modes by pressing the physical button, and can also switch between different cooking modes through touch; the touch feedback circuit 104 includes function switches K1 to K22, and resistors connected to the function switches K1 to K22 respectively. A resistor with a value of 510Ω (here is a physical button, if it is a touch button, it can also be changed to a capacitor resistor with a suitable resistance value), which is connected to the main control chip 105 through this resistor; the user presses the touch buttons K1 to K22 In any one of them, the current passes through the corresponding pins to the main control chip 105 through the corresponding resistor. After the main control chip 105 receives the signal, it starts to perform specific operations such as cooking rice, soup, stewing, keeping warm, opening and closing; the connection relationship is shown in Figure 11. For example, the function switch K1 is connected to the P37 pin of the main control chip 105 through the resistor R7, the function switch K2 is connected to the P36 pin of the main control chip 105 through the resistor R10, and the function switch K3 is connected to the main control chip 105 through the resistor R13. Pin P35, similarly, the function switches K4 to K22 are also connected to the main control chip 105 through corresponding resistors, which will not be further described here.

At the same time, as shown in Figure 13, Figure 14 and Figure 15, the GRID1 to GRID4 pins of the digital tube driver chip correspond to the GRID7 to GRID4 pins of the display driver chip, and the SEG1 to SEG8 pins of the digital tube driver chip correspond to the display driver. The SEG1 to SEG8 pins of the chip; in the LED light circuit, the positive poles of the LED lights L1 to L7 are respectively connected to the SEG1 to SEG8 pins of the display driver chip, and the negative poles are connected to the GRID5 pins of the display driver chip; the positive poles of the LED lights L8 to L14 are respectively Connect the SEG1 to SEG6 pins of the display driver chip, and the negative electrode is connected to the GRID5 pin of the display driver chip; when the corresponding function is selected, the main control chip controls the display driver chip, so that the voltage of the negative pin of the corresponding LED lamp is lower than the voltage of the positive pin, and the corresponding At the same time, there is a voltage difference between the GRID1 to GRID4 pins of the nixie tube driver chip and the SEG1 to SEG8 pins, and the nixie tube driver chip displays different numbers; preferably, the model of the display driver chip is AIP1640 (SOP28), those skilled in the art can also use other types of display driver chips to implement the solution designed by the present invention.

Further, as shown in FIG. 2 , FIG. 16 and FIG. 17 , it is another disclosed embodiment shown in the utility model, wherein the anode of the RGB lamp VD1 is connected to the +5V power supply, and the R pin and the G pin of the RGB lamp VD1 are connected. and B pins are respectively connected with the P52 pin, P51 pin and P50 pin of the main control chip 105 through the resistor R34, the resistor R33 and the resistor R32, and the resistance value of the resistor R34, the resistor R33 and the resistor R32 is 100Ω; During the eating stage, for example: heating, cooking, heat preservation and completion, etc., the main control chip controls the P52 pin, P51 pin, and P50 pin to generate different potentials, so that the red, green, and blue in the RGB lamp VD are given points in a certain proportion. The bright voltage lights up to produce colors of different intensities (brightness). The three primary colors of different intensities are mixed to form various colors, and different colors are changed in different cooking states. For example, only the primary color R shows red, indicating that it is in heating state, only the primary color G shows green, indicating that it is in the completed state, only the primary color B shows blue, indicating that it is in the heat preservation state, the primary color R and the primary color G light up with the same intensity, and it shows yellow, indicating that it is cooked In the rice state, the RGB lamp VD1 enables the user to recognize the cooking stage of the cooking appliance from a long distance.

Further, as shown in FIG. 3, FIG. 4, FIG. 11 and FIG. 16, it is another disclosed embodiment shown in the present invention, wherein the temperature processing circuit includes thermistor RJ1, thermistor RJ2, resistor R23, Resistor R31, capacitor C3 and capacitor C4, among which: the input end of resistor R23 is connected to the second pin of the power board interface circuit, the output end of resistor R23 is connected to the P41 pin of the main control chip, the input end of thermistor RJ1 Connect the +5V power supply, the output end of the thermistor RJ1 is connected to the input end of the resistor R23, the two ends of the capacitor C3 are respectively connected to the output end of the resistor R23 and the ground; the input end of the resistor R31 is connected to the first pin of the power board interface circuit , the output end of the resistor R31 is connected to the P42 pin of the main control chip 105, the input end of the thermistor RJ2 is connected to the +5V power supply, the output end of the thermistor RJ2 is connected to the input end of the resistor R31, and the two ends of the capacitor C4 are respectively connected The output terminal of the terminal resistor R31 is connected to the ground.

Among them, as an implementation method, the thermistor RJ1 and the thermistor RJ2 can choose the thermistor with a resistance value of 10kΩ and a tolerance accuracy of ±1%; the resistor R23 and the resistor R31 are resistors with a resistance value of 1kΩ, and the capacitor C3 and the capacitor C4. It is a capacitor with a capacity of 0.1uF. Resistor R23, resistor R3, capacitor C3 and capacitor C4 play a role in suppressing surge current in the circuit and protecting the circuit. The thermistor RJ1 and thermistor RJ2 are used for temperature sensing and feedback. To the main control chip, the main control chip transmits control signals to the RGB lamp VD1 1031 in combination with the clock signal and the temperature signal, so that the RGB lamp VD1 1031 changes different colors in different cooking stages.

Further, as shown in FIG. 5 and FIG. 16 , which are disclosed embodiments of another display circuit shown in the present invention, the display circuit further includes a first voltage regulator circuit connected to the main control chip; the first voltage regulator circuit Including: electrolytic capacitor EC2 and capacitor C2, electrolytic capacitor EC2 and capacitor C2 are connected in parallel, the positive electrode of electrolytic capacitor EC2 is connected to the VDD pin of the main control chip and the +5V power supply, and the negative electrode of electrolytic capacitor EC2 is grounded; among them, as an implementation method , the limit working voltage of electrolytic capacitor EC2 is 16V, the capacity is 100uF, and the capacity of capacitor C2 is 0.1uF; the input voltage is filtered by electrolytic capacitor EC3, and the output voltage is filtered by capacitor C6, so as to protect the circuit and prevent the circuit from damaged by the pulse.

Similarly, as shown in Figure 6 and Figure 15, the display circuit also includes a second voltage regulator circuit connected to the display driver chip; the second voltage regulator circuit includes: an electrolytic capacitor EC3 and a capacitor C6, and the electrolytic capacitor EC3 and the capacitor C6 are connected in parallel, The positive electrode of the electrolytic capacitor EC3 is connected to the VDD pin of the display driver chip and the +5V power supply, and the negative electrode of the electrolytic capacitor EC3 is grounded; among them, as an implementation method, the limit working voltage of the electrolytic capacitor EC3 is 16V, the capacity is 100uF, and the capacitor C6 Its capacity is 0.1uF, and its function is the same as that of the first voltage regulator circuit, so I won't go into details here.

Further, as shown in FIG. 7 and FIG. 15 , which are disclosed embodiments of another display circuit shown in the present invention, the display circuit further includes a data input signal protection circuit; the data input signal protection circuit includes: a resistance R35, a resistance R36 and capacitor C5, the input end of the resistor R36 is connected to the P45 pin of the main control chip 105, and the output end is connected to the DIN pin of the display driver chip; the input end of the resistor R35 is connected to the +5V power supply, and the output end is connected to the output end of the resistor R36; The two ends of the capacitor C5 are respectively connected to the output end of the resistor R36 and the ground. Specifically, as an implementation method, the resistance value of the resistor R35 is 10kΩ, the resistance value of the resistor R36 is 220Ω, and the capacity of the capacitor C5 is 100pF. The signal protection circuit prevents overcurrent and performs overcurrent protection on the main control chip 105 .

Further, as shown in FIG. 8 and FIG. 15 , which are disclosed embodiments of another display circuit shown in the present invention, the display circuit further includes a clock input signal protection circuit; the clock input signal protection circuit includes: a resistance R37, a resistance R38 and capacitor C7, the input end of the resistor R38 is connected to the main control chip 105, and the output end is connected to the display driver chip 1032; the input end of the resistor R37 is connected to the +5V power supply, and the output end is connected to the output end of the resistor R38; the two ends of the capacitor C7 are respectively connected The output terminal of the resistor R38 is connected to the ground. As an implementation method, the resistance value of the resistor R37 is 10kΩ, the resistance value of the resistor R38 is 220Ω, and the capacity of the capacitor C7 is 100pF. The clock input signal protects the circuit to prevent overcurrent. The display driver chip 1032 performs overcurrent protection.

Further, as shown in FIG. 9 and FIG. 16 , which are disclosed embodiments of another display circuit shown in the present invention, the display circuit further includes a buzzer circuit arranged on the PCB board; the buzzer circuit includes: DC buzzer BUZ1, electrolytic capacitor EC1, transistor Q1, transistor Q2, transistor Q3, capacitor C1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5 and resistor R6; the input end of resistor R6 is connected to the main control chip 105 The P04 pin, the output terminal is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 and the base of the transistor Q1 are connected to the resistor R4, and the two ends of the resistor R3 are respectively connected to the base of the transistor Q1. Between the stage and the emitter, the emitter of the transistor Q1 is connected to the +12V power supply, the two ends of the resistor R1 are respectively connected to the collector of the transistor Q1 and the positive electrode of the electrolytic capacitor EC1, the negative electrode of the electrolytic capacitor EC1 is grounded, and the two ends of the resistor R2 are respectively connected Connect the collector of the transistor Q1 and the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, the resistor R5 is connected in parallel with the capacitor C1, one end is connected to the P40 pin of the main control chip 105, the other end is connected to the base level of the transistor Q2, the DC buzzer The device BUZ1 is connected between the collector of the transistor Q1 and the collector of the transistor Q2.

Specifically, as an implementation method, you can choose to use a 4KHz, 7*14mm DC buzzer BUZ1; the transistor Q1 is a PNP transistor with a power of 0.45W, a current of 0.1A, and a withstand voltage of 50V; the transistor Q2 and the transistor Q3 have a power of 0.45 W, current 0.1A, NPN transistor with 50V withstand voltage; resistance value of resistor R1 is 100Ω, resistance value of resistor R2 is 2KΩ, resistor R2 is a current limiting resistor, which is used for the branch circuit where the other end of buzzer BUZ1 is located Carry out overcurrent protection; the resistance value of resistor R3 is 10KΩ, the resistance value of resistor R4 is 4.7KΩ, the resistance value of resistors R3 and R4 is used for overcurrent protection of the branch of transistor Q1, the resistance value of resistor R5 and resistor R6 is 1KΩ; The capacity of the capacitor C1 is 0.001uF; the limit working voltage of the electrolytic capacitor EC1 is 25V, and the capacity is 100uF; of course, in some cases of this embodiment, the transistor Q1 can also be an NPN transistor, and the transistor Q2 and the transistor Q3 can also be PNP type triode, but the structure of the circuit should also change accordingly; the main control chip 105 receives an abnormal signal according to the internal timing program, the temperature sensing signal generated by the temperature processing circuit 102, etc., the P04 pin of the main control chip 105 and P40 pin to generate the corresponding voltage, the transistor Q1 and the transistor Q2 are turned on and supply power to the buzzer BUZ1, so that the buzzer BUZ1 makes a sound to remind the user, and at the same time, it also supplies power to the electrolytic capacitor C1, so that the voltage will not change suddenly, When the transistor Q1 is turned off, the electrolytic capacitor C1 discharges, so that the voltage will not change abruptly. The voltage applied to the two ends of the buzzer BUZ1 is a gradual voltage, and the buzzer BUZ1 produces a residual sound, that is, the capacity of the electrolytic capacitor C1 will determine the length of the residual sound. . In this embodiment, the buzzer BUZ1 is used for alarm reminders under certain circumstances, and the current resistance R2 and the resistance R3 protect the circuit, which improves the safety and reliability of the circuit.

Further, as shown in FIG. 10 and FIG. 16 , which are disclosed embodiments of another display circuit shown in the present invention, the display circuit further includes a power-down memory circuit arranged on the PCB board; the power-down memory circuit includes: Electrolytic capacitor EC5, resistor R40, resistor R41 and diode D2, diode D2 is connected in parallel with resistor R40, resistor R41 is connected in parallel with electrolytic capacitor EC5, the positive electrode of diode D2 is connected to the P43 pin of the main control chip 105, and the negative electrode is connected to the positive electrode of electrolytic capacitor EC5 , the negative electrode of the electrolytic capacitor EC5 is grounded; specifically, as an implementation method, the limit operating voltage of the electrolytic capacitor EC5 is 10V, the capacity is 470Uf, the resistance value of the resistor R40 is 10KΩ, the resistance value of the resistor R41 is 1MΩ, and the diode D2 is The diode of type 1N148; when the power supply is normal, the main control chip 105 charges the electrolytic capacitor EC5 through the resistor R40 and the diode D2. If the power supply voltage is cut off, the electrolytic capacitor EC5 discharges through the bleeder resistor R41 (received by the diode). D2 control so that the current does not flow backwards), by calculating the discharge time, the main control chip determines the power-off time of the rice cooker, and the main control chip evaluates whether it needs to continue to delay or immediately start other loads according to this time. low, very practical.

Further, another embodiment disclosed by the present utility model discloses a display device, which includes the above-mentioned display circuit, and also includes a control panel and a lampshade, the control panel is covered on a PCB board, and includes buttons and/or RGB lamp reserved holes; The lampshade is covered on the RGB lamp VD1; the device can be used in any household appliance to display the working status of the household appliance through the RGB lamp, so that the user can identify the working status of the appliance at a long distance.

Further, the lampshade ³ covered on the RGB lamp VD1 is a lampshade with an area of not less than 25mm . Specifically, a suitable size can be selected according to the size of the appliance installed by the display device, and it can also be customized according to customer requirements. The preferred area of the utility model is 25mm. ^2-380mm2 lampshade, the lampshade can be circular, square, polygonal, etc. ^The utility model does not further limit the shape of the lampshade, assuming that the shape of the lampshade 3 is a circle, its diameter can be 5-22mm, so that customers can More clearly and clearly identify the working status of the appliance from a distance.

Another embodiment disclosed by the present utility model discloses a cooking utensil, which includes the above-mentioned display device, and also includes a cooking utensil body 4 and a surface sticker 5. The PCB board 1 is fixed on the cooking utensil body 4, and the surface sticker 5 is affixed to the control device. On the panel 2, the function corresponding to the button 201 and the corresponding cooking stage indicated by the different colors of the RGB lamp VD1 1031 are printed on the surface sticker 5, and the printed content is in other languages such as Chinese, English, Russian or Japanese. The cooking utensils described in the new model can be rice cookers, as shown in Figure 17, and can also be commonly used cooking appliances such as air fryers, electric ovens, pressure cookers, microwave ovens, etc. The text and color description can be coated with fluorescent material, which is convenient for users to distinguish in the case of poor light.

The utility model realizes the status indication under different modes, and has excellent visibility. The RGB lamp VD1 changes different colors at different stages of different cooking modes, so that users can identify the cooking of the cooking utensils at a long distance. stage, its display method is simple and beautiful, which is convenient for users to use.

The present utility model has been further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as a limitation on the essence and scope of the present utility model. There are differences, but as long as it is based on the design principle of the present utility model, the adaptive modification made only according to the different chip models should also belong to the protection scope of the present utility model.

Claims

A display circuit is characterized by comprising: a PCB board and a power supply board interface circuit, a temperature processing circuit, a digital display driving circuit, a touch feedback circuit and a main control chip arranged on the PCB board, the temperature processing circuit and The power board interface circuit is electrically connected, and the power board interface circuit, the digital display driving circuit, the temperature processing circuit and the touch feedback circuit are electrically connected with the main control chip; the digital display driving circuit includes RGB lamps VD1, A display driver chip, a digital tube driver chip and several LED lights, the digital tube driver chip, several LED lights are electrically connected to the display driver chip, the RGB lamp VD1, the display driver chip and the main control chip are electrically connected. connect.
The display circuit according to claim 1, wherein the anode of the RGB lamp VD1 is connected to a +5V power supply, and the R pin, the G pin and the B pin of the RGB lamp VD1 pass through the resistor R34 and the resistor R33 respectively. And the resistor R32 is connected with the main control chip.
The display circuit of claim 1, wherein the temperature processing circuit comprises a thermistor RJ1, a thermistor RJ2, a resistor R23, a resistor R31, a capacitor C3 and a capacitor C4, wherein:

The input end of the resistor R23 is connected to the power board interface circuit, the output end of the resistor R23 is connected to the main control chip, the input end of the thermistor RJ1 is connected to the +5V power supply, and the thermistor The output end of RJ1 is connected to the input end of the resistor R23, and the two ends of the capacitor C3 are respectively connected to the output end of the resistor R23 and the ground;

The input end of the resistor R31 is connected to the interface circuit of the power board, the output end of the resistor R31 is connected to the main control chip, the input end of the thermistor RJ2 is connected to the +5V power supply, and the thermistor The output end of RJ2 is connected to the input end of the resistor R31, and the two ends of the capacitor C4 are respectively connected to the output end of the resistor R31 and the ground.
The display circuit according to claim 1, further comprising a data input signal protection circuit; the data input signal protection circuit comprises: a resistor R35, a resistor R36 and a capacitor C5, and the input end of the resistor R36 is connected to the The main control chip, the output terminal is connected to the display driver chip; the input terminal of the resistor R35 is connected to the +5V power supply, and the output terminal is connected to the output terminal of the resistor R36; the two ends of the capacitor C5 are respectively connected to the resistor R36. output and ground.
The display circuit according to claim 1, further comprising a clock input signal protection circuit; the clock input signal protection circuit comprises: a resistor R37, a resistor R38 and a capacitor C7, and the input end of the resistor R38 is connected to the The main control chip, the output terminal is connected to the display driver chip; the input terminal of the resistor R37 is connected to the +5V power supply, and the output terminal is connected to the output terminal of the resistor R38; the two ends of the capacitor C7 are respectively connected to the resistor R38. output and ground.
The display circuit according to claim 1, further comprising a buzzer circuit arranged on the PCB; the buzzer circuit comprising: a DC buzzer BUZ1, an electrolytic capacitor EC1, a transistor Q1, Transistor Q2, transistor Q3, capacitor C1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5 and resistor R6;

The input end of the resistor R6 is connected to the main control chip, the output end is connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 and the base of the transistor Q1 are connected. The resistor R4 is connected between the two ends of the resistor R3, the two ends of the resistor R3 are respectively connected between the base stage and the emitter of the transistor Q1, the emission set of the transistor Q1 is connected to the +12V power supply, and the two ends of the resistor R1 are respectively connected. The collector of the transistor Q1 and the positive electrode of the electrolytic capacitor EC1, the negative electrode of the electrolytic capacitor EC1 is grounded, and the two ends of the resistor R2 are respectively connected to the collector of the transistor Q1 and the collector of the transistor Q2, The emitter of the triode Q2 is grounded, the resistor R5 is connected in parallel with the capacitor C1, one end is connected to the main control chip, the other end is connected to the base stage of the triode Q2, and the DC buzzer BUZ1 is connected to the Between the collector of the transistor Q1 and the collector of the transistor Q2.
The display circuit according to claim 1, further comprising a power-down memory circuit arranged on the PCB;

The power-down memory circuit includes: an electrolytic capacitor EC5, a resistor R40, a resistor R41 and a diode D2, the diode D2 is connected in parallel with the resistor R40, the resistor R41 is connected in parallel with the electrolytic capacitor EC5, and the diode D2 is connected in parallel. The positive electrode is connected to the main control chip, the negative electrode is connected to the positive electrode of the electrolytic capacitor EC5, and the negative electrode of the electrolytic capacitor EC5 is grounded.
A display device, characterized in that it comprises the display circuit according to any one of claims 1-7, and further comprises a control panel and a lampshade;

The control panel is covered on the PCB, and includes reserved holes for buttons and/or RGB lights;

The lampshade covers the RGB lamp VD1.
The display device according to claim 8, wherein the area of the lampshade is not less than 25 mm 2 .
A cooking utensil, characterized in that it includes the display device according to claim 8 or 9, and further includes a cooking utensil body and a surface sticker, the PCB board is fixed on the cooking utensil body, and the surface sticker is attached to the cooking utensil body. on the control panel.