CN216724200U

CN216724200U - Split cooking utensil

Info

Publication number: CN216724200U
Application number: CN202122694298.9U
Authority: CN
Inventors: 朱泽春; 宁文斯; 周建东
Original assignee: Joyoung Co Ltd
Current assignee: Joyoung Co Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-06-14
Anticipated expiration: 2031-11-05

Abstract

The utility model provides a split type cooking utensil, includes the pot body, pot cover, the pot body is equipped with main circuit board, the pot cover is equipped with first load and second load, the operating voltage of first load is greater than the second load, first load and second load pass through the coupler and connect main circuit board, main circuit board includes master control MCU, first control circuit, second control circuit, first control circuit and second control circuit are equipped with the ground connection common port, and first control circuit and second control circuit's control end are connected with master control MCU respectively, the coupler is equipped with first grafting end, second grafting end and third grafting end, and first control circuit is connected to first grafting end, and second grafting end is connected the second control circuit, third grafting end and common port connection ground connection. In the utility model, the number of PIN PINs is reduced in a mode that the first control circuit and the second control circuit share a grounding terminal, so that the complexity and the cost of the circuit are reduced.

Description

Split cooking utensil

Technical Field

The utility model relates to the field of kitchen appliances, in particular to a split type cooking appliance.

Background

The current circuit connected by the coupler in the cooking appliance uses a large amount of PIN needle resources when the coupler is connected with different circuits due to different working voltages of respective loads and the problem that the coupler PIN contains too many electric networks.

For example, as shown in fig. 1, in the conventional fan circuit and top temperature acquisition circuit of a split air-cooled pressure cooker, a temperature measuring head is a pulse digital temperature measuring head, the temperature measuring head needs 2 wires to the outside, one is a common ground wire, the other is a wire responsible for power supply and communication signals (peak voltage 5V), and the fan is a dc fan and is driven by an NPN type triode and is connected in series between a collector of the triode and power supply 18V.

The circuit is arranged on a power panel on the cooker body and is connected with the lower coupler through a terminal, the upper cover of the pressure cooker is provided with the upper coupler which can be in butt joint with the lower coupler, and the upper coupler is connected with the fan and the temperature measuring head.

However, in the actual use process at present, as can be seen from fig. 1, when the FAN driving port FAN is at a high level, the triode is turned on, and the collector of Q1 has a certain voltage drop relatively, which is not 0V, so that the external 4 PINs of the lower coupler are all independent electrical networks, which cannot be multiplexed, so that the machine can be guaranteed to work normally by using the 4-PIN coupler, when the PINs are used too much, the overall circuit complexity and cost of the cooking appliance can be increased, and the negative pole end of the FAN always has a certain voltage drop, which affects the use.

Disclosure of Invention

In order to solve the above problems, the present invention provides a split cooking appliance, which can realize multiplexing of a pulse temperature sensor and a fan driving circuit only through a 3PIN of a coupler, so as to reduce the complexity and cost of the circuit.

The technical scheme of the utility model is as follows:

the utility model provides a split type cooking utensil, includes the pot body, pot cover, the pot body is equipped with main circuit board, the pot cover is equipped with first load and second load, the operating voltage of first load is greater than the second load, first load and second load pass through the coupler and connect main circuit board, main circuit board includes main control MCU, first control circuit, second control circuit, first control circuit is equipped with ground connection common port with the second control circuit, and first control circuit is connected with main control MCU with the control end of second control circuit respectively, the coupler is equipped with first grafting end, second grafting end and third grafting end, and first control circuit is connected to first grafting end, and second control circuit is connected to the second grafting end, the third grafting end is connected ground connection with the common port.

In one embodiment of the present invention, the first load is a fan, and the second load is a pulse temperature sensor.

In one embodiment of the present invention, the first control circuit is a fan driving circuit, and the second control circuit is a temperature acquisition circuit.

As an embodiment of the present invention, the fan driving circuit includes a first switching tube Q1 and a second switching tube Q2 with opposite polarities, and an output terminal of the first switching tube Q1 is connected to an input terminal of the second switching tube Q2.

In an embodiment of the present invention, the first switching tube Q1 is an NPN transistor, the second switching tube Q2 is a PNP transistor, the collector of the first switching tube Q1 is connected to the base of the second switching tube Q2, the emitter of the first switching tube Q1 is grounded, the emitter of the second switching tube Q2 is connected to a dc power supply, and the collector of the second switching tube Q2 is connected to the fan through a first plug terminal.

As an embodiment of the present invention, the emitter of the first switching tube Q1 is further connected to the base of the first switching tube Q1 through a pull-down resistor R12, and the dc power supply is further connected to the base of the second switching tube Q2 through a pull-up resistor R13.

As an embodiment of the present invention, the first control circuit forms a ground common terminal through the discharge element.

In one embodiment of the present invention, the discharge element is a diode or a resistor.

As an embodiment of the utility model, the temperature acquisition circuit comprises a resistor R21 and a capacitor C21 which are connected in parallel, the capacitor C21 is grounded, and the resistor R21 is connected to the pulse temperature measurement sensor through a second plug terminal.

As an embodiment of the present invention, one end of the resistor R21 near the coupler is also grounded through a capacitor C22.

The technical effects of the utility model are as follows:

the utility model provides a split type cooking utensil, includes the pot body, pot cover, the pot body is equipped with main circuit board, the pot cover is equipped with first load and second load, the operating voltage of first load is greater than the second load, first load and second load pass through the coupler and connect main circuit board, main circuit board includes main control MCU, first control circuit, second control circuit, first control circuit is equipped with ground connection common port with the second control circuit, and first control circuit is connected with main control MCU with the control end of second control circuit respectively, the coupler is equipped with first grafting end, second grafting end and third grafting end, and first control circuit is connected to first grafting end, and second control circuit is connected to the second grafting end, the third grafting end is connected ground connection with the common port. In the embodiment, the number of the PINs used is reduced in a mode that the first control circuit and the second control circuit for controlling loads with different working voltages share the grounding end, the complexity and the cost of the circuit are reduced, meanwhile, the negative electrode is always kept at 0V, and compared with the prior art, the number of independent electric networks is reduced, and more circuits can be conveniently multiplexed on the same coupler.

Preferably, the first load is a fan, and the second load is a pulse type temperature measuring sensor. The fan and the pulse temperature measuring sensor are used as the combined selection of the load, and the multiplexing of the air-cooled radiating control circuit is realized.

Preferably, the first control circuit is a fan driving circuit, and the second control circuit is a temperature acquisition circuit. The fan driving circuit is matched with the fan to accurately control the fan, the temperature acquisition circuit is matched with the pulse type temperature measurement sensor, and the output end of the temperature acquisition circuit can output a high-frequency pulse signal to the main control MCU for more accurately judging the real-time temperature of the pulse type digital temperature measurement head.

Preferably, the fan driving circuit includes a first switching tube Q1 and a second switching tube Q2 with opposite polarities, and an output terminal of the first switching tube Q1 is connected to an input terminal of the second switching tube Q2. The fan driving circuit is used for controlling the working state of the fan, the fan is controlled by using the two switch tubes which are opposite in polarity and are connected with each other as the combination switch, the output end of the combination switch is only required to be connected with the first plug-in end of the coupler, the voltage which keeps the two ends of the fan stable can be ensured by simultaneously connecting the direct-current power supply, and the working state of the combination switch is completely controlled by the combination switch.

Preferably, the first switching tube Q1 is an NPN transistor, the second switching tube Q2 is a PNP transistor, a collector of the first switching tube Q1 is connected to a base of the second switching tube Q2, an emitter of the first switching tube Q1 is grounded, an emitter of the second switching tube Q2 is connected to a dc power supply, and a collector of the second switching tube Q2 is connected to the fan through a first plug terminal. Adopt the triode as the switch tube, its resistant excessive pressure antistatic electricity ability is strong, the environmental reliability is higher, compare prior art, replace original single triode with forming the combination switch through using two triodes that polarity is opposite among this embodiment, and be connected to between coupler and the DC power supply with the output of switch, when making the disconnection of second switch tube, the fan opens circuit, when second switch tube switches on along with first switch tube simultaneously, the fan begins work, and because of the earthing terminal of fan and circuit sharing a PIN needle, can be when accomplishing fan drive circuit control fan operating condition, make the negative pole end of fan remain at 0V all the time.

Preferably, the emitter of the first switching tube Q1 is further connected to the base of the first switching tube Q1 through a pull-down resistor R12, and the dc power supply is further connected to the base of the second switching tube Q2 through a pull-up resistor R13. A pull-down resistor is arranged at the signal input position of the first switching tube, so that when the input signal of the base electrode of the first switching tube Q1 is in floating failure, the input of the base electrode of the first switching tube Q1 is pulled down to a low level to be disconnected; the pull-up resistor is arranged at the signal input of the second switch tube Q2, so that when the first switch tube Q1 is damaged and fails, the base of the second switch tube Q2 is always kept at a high level, and at the moment, the second switch tube is not conducted.

Preferably, the first control circuit forms a ground common terminal through the discharge element. In order to protect the devices in the first control circuit, a discharge element is connected between the output of the first control circuit and the first plug-in terminal of the coupler for discharging the reverse current.

Preferably, the discharge element is a diode or a resistor. The reverse current caused by the inductive element can be smoothly released by using a resistor or a diode as the discharge element, wherein the diode is superior to the resistor in practical effect.

Preferably, the temperature acquisition circuit comprises a resistor R21 and a capacitor C21, the capacitor C21 is grounded, the resistor R21 is connected to a second load through a second plug end, and the second load is a pulse temperature measurement sensor. The temperature acquisition circuit is used as a circuit sharing the same coupler with the fan driving circuit and used for measuring the real-time temperature of the cooking appliance to determine the control of the fan driving circuit on the working state of the fan, and the temperature sensed by the pulse type temperature measurement sensor is measured in an RC temperature measurement mode, wherein the RC temperature acquisition circuit is simple in circuit structure and low in cost.

Preferably, one end of the resistor R21 near the coupler is also grounded through a capacitor C22. When the fan is closed, the interference to the ground wire can be generated, and the filter plate capacitor is additionally arranged at the ground wire, so that the signal interference generated when the fan is closed can be filtered, and the normal operation of the whole circuit is maintained.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a circuit for coupling two circuits in the prior art.

Fig. 2 is a connection block diagram of coupling two circuits in the present invention.

Fig. 3 is a circuit schematic of the coupling of two circuits in the present invention.

Detailed Description

A split type cooking appliance comprises a pot body and a pot cover, wherein the pot body is provided with a main circuit board, the pot cover is provided with a first load and a second load, the working voltage of the first load is larger than the second load, the first load and the second load are connected with the main circuit board through a coupler, the main circuit board comprises a main control MCU, a first control circuit and a second control circuit, the first control circuit and the second control circuit are provided with a grounding common end, the control ends of the first control circuit and the second control circuit are respectively connected with the main control MCU, the coupler is provided with a first plugging end, a second plugging end and a third plugging end, the first plugging end is connected with the first control circuit, the second plugging end is connected with the second control circuit, and the third plugging end is connected with the common end and grounded. Compared with the scheme that a 4PIN PIN is coupled with two circuits in the circuit in the prior art, the cooking circuit provided by the utility model can reduce the complexity and the cost of the circuit as shown in figure 1.

In the above scheme, three or more circuits may be connected to the same coupler in the form of a common ground terminal, so as to implement multi-circuit multiplexing, thereby saving PIN resources of the coupler.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 2 and fig. 3, the circuit disposed on the main circuit board includes a first control circuit and a second control circuit connected to the same coupler J1, in this embodiment, the first control circuit is a fan driving circuit, a signal input terminal of the fan driving circuit is connected to the main control MCU, the coupler includes a first plug terminal, a second plug terminal and a grounded third plug terminal, an output terminal of the fan driving circuit is connected to the first plug terminal, the first plug terminal is further connected to a first load, in this embodiment, the first load is a fan, and a ground terminal of the fan is connected to the third plug terminal.

In this embodiment, the second control circuit is a temperature acquisition circuit, an output terminal of the temperature acquisition circuit is connected to the main control MCU, a signal input terminal of the temperature acquisition circuit is connected to the second socket, the second socket is further connected to a second load, the second load is a pulse temperature sensor in this embodiment, and a ground terminal of the pulse temperature sensor is connected to the third socket.

In the actual circuit layout, the types of the first control circuit and the second control circuit are not limited to the fan driving circuit and the temperature acquisition circuit, and may be any cooking circuit that needs to use a coupler to connect a corresponding load, for example, a pair or a plurality of circuit combinations of the fan driving circuit and the fan, the heating tray driving circuit and the heating tray, the power supply circuit and the load that needs to be supplied with power, the fan driving circuit and the pulse temperature measurement sensor, and the like, the number of the single circuit connected to the coupler J1 is not limited, and the single circuit is determined according to the actual circuit layout requirements, and three or more circuits may be simultaneously connected to the coupler J1. In the embodiment, the multiplexing circuit in which the fan driving circuit and the temperature acquisition circuit share the same plug terminal is taken as an example to illustrate that the technical scheme of the present invention has the technical effects of reducing the number of PIN PINs of the coupler J1, reducing the cost and simplifying the circuit.

Specifically, the FAN driving circuit includes two switching tubes with opposite polarities, which are a first switching tube Q1 and a second switching tube Q2 shown in fig. 3, where the first switching tube Q1 employs an NPN transistor in this example, and the second switching tube Q2 is a PNP transistor, where a collector of the first switching tube Q1 is connected to a base of the second switching tube Q2, the base of the first switching tube Q1 is used as a signal input end of the FAN driving circuit and receives a control signal from the main control MCU, such as a FAN input, and the second switching tube Q2 forms a combined switch that is turned on and off simultaneously in cooperation with the first switching tube Q1 and is used for controlling the FAN to be turned on and off.

When the FAN inputs a high level (for example, 5V), the first switch tube Q1 is turned on, the collector outputs a low level, the second switch tube is turned on at the same time, the voltage at the first plug end is the dc power supply voltage, the FAN starts to work, when the FAN input is changed to a low level, the first switch tube Q1 is turned off, the base of the second switch tube Q2 is a high level, the second switch tube Q2 is turned off, no voltage is present at the first plug end, and the FAN is turned off.

In order to meet the requirement of simultaneous switching of the switching tubes, as shown in fig. 3, wherein an emitter of the first switching tube Q1 is grounded, an emitter of the second switching tube Q2 is connected to a dc power supply, and a collector of the second switching tube Q2 is connected to the fan through a first plug terminal, in this embodiment, an 18V dc voltage source may be used, a current limiting resistor R11 and a current limiting resistor R14 are further disposed between the first switching tube Q1 and the second switching tube Q2, and a base current limiting resistor is disposed to limit a base current to prevent the triode from being burned due to an excessive current.

In the embodiment, the two switch tubes with opposite polarities are used as the combined switch, the fan can be started by inputting only one smaller voltage at the signal input end of the fan driving circuit, the voltage can be independently provided by the main control MCU without adding additional elements, and the switch can ensure that the switch tubes are only used in work while the switch tubes are switched simultaneously, so that the switch tubes in the mode have longer service life and higher reliability.

As shown in fig. 3, the emitter of the first switch tube Q1 is further connected to the base of the first switch tube Q1 through a pull-down resistor R12, the dc power supply is further connected to the base of the second switch tube Q2 through a pull-up resistor R13, the pull-down resistor is configured to ensure that the base of the first switch tube Q1 is at a low level when the input signal fails, so that the first switch tube is always in an off state, and the pull-up resistor is configured to ensure that the base of the second switch tube Q2 is at a high level when the first switch tube Q1 is damaged, so that the base of the second switch tube Q2 is always in an off state.

In addition, since the fan is an inductive device, a reverse electromotive force is generated in a short time at the moment of turning off, and at this time, a reverse current may flow back to the fan driving circuit to damage a triode therein, in order to prevent this problem, in this embodiment, the first plugging terminal of the coupler J1 is grounded through a discharge element to form a discharge loop, as shown in fig. 3, the discharge element in this embodiment is a diode D1, in other embodiments of this embodiment, the discharge element may be replaced by a resistor, but the discharge effect of the diode is better than that of the resistor through actual testing, so the discharge element in an actual product is mainly a diode.

As another implementation manner of this embodiment, a PNP transistor is used as the first switching transistor Q1, meanwhile, the second switch tube Q2 is implemented as an NPN transistor to form a combined switch, which is different from the above-mentioned scheme in that it is required to connect the emitter of the first switch tube Q1 to a dc power supply, and simultaneously connect the emitter of the second switch tube Q2 to ground, the rest connection methods are the same as the components, when the scheme is operated, when FAN outputs high level, the first switch tube Q1 and the second switch tube Q2 are simultaneously disconnected, at the moment, the FAN is started, when the FAN output is low, the first switch Q1 and the second switch Q2 are turned on simultaneously, but the FAN is turned off, because the scheme is that the first switch tube Q1 and the second switch tube Q2 are continuously conducted when the fan is idle, namely in an inoperative state, the service life of the switch tubes can be reduced, and the reliability of the circuit is reduced, the practical use experience is inferior to that of the scheme.

The types of the switch tubes are not limited, and other switch tubes, such as mos tubes, may be adopted, the specific circuit when using other switch tubes varies according to the actual requirements, and the scheme of using a plurality of switch tubes as a combined switch to control the corresponding load and sharing the ground terminal with other circuits is within the protection scope of the present invention.

As shown in fig. 3, the temperature acquisition circuit includes a resistor R21 and a capacitor C21 connected in parallel, the capacitor C21 is grounded, the resistor R21 is connected to the pulse-type temperature measurement sensor through a second plug terminal, the pulse-type temperature measurement sensor in this embodiment employs a pulse-type digital temperature measurement head, the temperature acquisition circuit utilizes the principle of RC temperature measurement, a control chip (not shown in the figure) of the pulse-type temperature measurement sensor sends a pulse signal (for example, a pulse signal with a peak voltage of 5V), the pulse signal passes through the pulse-type temperature measurement sensor-coupler-RC temperature acquisition circuit and enters an AD sampling port of the main control MCU, the main control MCU converts the measured data, and finally, the temperature value is determined. The control signal of the main control MCU to the fan driving circuit comes from the temperature measurement and judgment result of the temperature acquisition circuit, and after the comparison between the preset temperature value in the single chip and the measured temperature value is carried out, the control signal for opening or closing the fan driving circuit is judged to be output to the fan driving circuit, and finally the control signal is output to the fan driving circuit in a high-low level mode.

In this embodiment, the temperature acquisition circuit is used for controlling the fan driving circuit, the two circuits are connected to the same coupler by using the original existing connection of the two circuits, the PIN resource of the coupler is saved, and meanwhile, the circuit layout is convenient to perform.

Considering that the interference signals may affect the ground line at the third end of the coupler, in this embodiment, the end of the resistor R21 near the coupler J1 is grounded through the capacitor C22, wherein the capacitor C22 is used to filter the interference signals that may be generated when the fan is turned off, so as to ensure that the ground line is not affected.

The cooking utensil in the embodiment can be an electric cooker, a pressure cooker, a steam cooker and the like.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a split type cooking utensil, includes the pot body, pot cover, the pot body is equipped with main circuit board, the pot cover is equipped with first load and second load, the operating voltage of first load is greater than the second load, first load and second load pass through the coupler and connect main circuit board, its characterized in that, main circuit board includes main control MCU, first control circuit, second control circuit, first control circuit is equipped with the ground connection common port with the second control circuit, and first control circuit is connected with main control MCU with the control end of second control circuit respectively, the coupler is equipped with first grafting end, second grafting end and third grafting end, and first control circuit is connected to first grafting end, and second control circuit is connected to the second grafting end, the third grafting end is connected ground connection with the common port.

2. The split cooking appliance of claim 1, wherein the first load is a fan and the second load is a pulsed temperature sensor.

3. The split cooking appliance according to claim 2, wherein the first control circuit is a fan driving circuit and the second control circuit is a temperature collecting circuit.

4. The split cooking appliance according to claim 3, wherein the fan driving circuit comprises a first switching tube Q1 and a second switching tube Q2 with opposite polarities, and the output end of the first switching tube Q1 is connected to the input end of the second switching tube Q2.

5. The split cooking appliance according to claim 4, wherein the first switch tube Q1 is an NPN transistor, the second switch tube Q2 is a PNP transistor, the collector of the first switch tube Q1 is connected to the base of the second switch tube Q2, the emitter of the first switch tube Q1 is grounded, the emitter of the second switch tube Q2 is connected to a dc power supply, and the collector of the second switch tube Q2 is connected to the fan through the first plug terminal.

6. The split cooking appliance according to claim 5, wherein the emitter of the first switching tube Q1 is further connected to the base of the first switching tube Q1 through a pull-down resistor R12, and the DC power supply is further connected to the base of the second switching tube Q2 through a pull-up resistor R13.

7. The split cooking appliance according to any one of claims 1 to 6, wherein the first control circuit forms a ground common terminal through a discharge element.

8. The split cooking appliance of claim 7, wherein the discharge element is a diode or a resistor.

9. The split cooking appliance according to claim 3, wherein the temperature acquisition circuit comprises a resistor R21 and a capacitor C21 which are connected in parallel, the capacitor C21 is grounded, and the resistor R21 is connected to the pulse temperature measurement sensor through a second plug terminal.

10. The split cooking appliance according to claim 9, wherein the resistor R21 is further grounded at the end near the coupler through a capacitor C22.