CN215071776U - Power supply circuit and cooking utensil - Google Patents

Abstract

The application provides a supply circuit and cooking utensil, this supply circuit includes: the power supply control circuit comprises a power supply chip circuit, a power failure detection circuit, a battery module, a switch circuit, a temperature detection circuit and a control circuit; the input end of the power chip circuit is connected with commercial power; the output end of the power chip circuit is connected with the input end of the battery module; the power supply chip circuit is also connected with the power failure detection circuit; the switch circuit is respectively connected with the output end of the power chip circuit and the output end of the battery module; the switch circuit is also connected with the control circuit, the temperature detection circuit, the heat dissipation module of the cooking appliance and the alarm module; the control circuit is respectively connected with the battery module, the power failure detection circuit, the temperature detection circuit, the heat dissipation module and the alarm module; the control circuit is used for controlling the battery module heat dissipation module and/or the alarm module to supply power to enable the alarm module to work when the cooking appliance is powered off and the temperature of the oven surface is greater than a preset value, so that the safety of the cooking appliance is improved.

Description

Power supply circuit and cooking utensil

Technical Field

The application relates to household electrical appliances, in particular to a power supply circuit and a cooking appliance.

Background

For a cooking appliance which utilizes a heating wire or a coil panel to heat, such as an electric ceramic oven or an electromagnetic oven, the heating wire or the coil panel generates extremely high heat when the cooking appliance works, and under the normal condition, after a cooking program is finished, the cooking appliance can control a heat dissipation device to continue working for a period of time, so that the temperature of the heating wire or the coil panel is reduced to a safe temperature.

However, sometimes a user may immediately unplug the power plug of the cooking appliance after the cooking procedure is completed, in this case, all modules of the cooking appliance, including the heat dissipation device thereof, may immediately stop working, and the temperature of the heating wire or the coil panel is not sufficiently lowered, thereby resulting in a great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The application provides a supply circuit and cooking utensil for reduce cooking utensil's high temperature risk, improve cooking utensil's security.

In a first aspect, the present application provides a power supply circuit for a cooking appliance, comprising: the power supply control circuit comprises a power supply chip circuit, a power failure detection circuit, a battery module, a switch circuit, a temperature detection circuit and a control circuit;

the input end of the power chip circuit is connected with commercial power; the output end of the power supply chip circuit is connected with the input end of the battery module; the power supply chip circuit is also connected with the power failure detection circuit;

the switch circuit is connected with the output end of the power supply chip circuit and the output end of the battery module respectively; the switch circuit is also connected with the control circuit, the temperature detection circuit, the heat dissipation module of the cooking appliance and the alarm module;

the control circuit is respectively connected with the battery module, the power failure detection circuit, the temperature detection circuit, the heat dissipation module and the alarm module;

the control circuit is used for detecting whether the cooking utensil is powered off or not through the power-off detection circuit, detecting the stove surface temperature of the cooking utensil through the temperature detection circuit when the cooking utensil is powered off, controlling the battery module to supply power to the heat dissipation module in the cooking utensil through the switch circuit to enable the heat dissipation module to work when the stove surface temperature is larger than a preset value, and/or controlling the battery module to supply power to the alarm module to enable the alarm module to work.

Through the power supply circuit, the cooking utensil can utilize the battery module to supply power for the temperature detection circuit after the power failure for the temperature detection circuit continues to detect the stove face temperature, and after the stove face temperature is more than or equal to the default, control battery module for heat dissipation module and/or alarm module power supply so that its work, thereby reduce cooking utensil's potential safety hazard.

In one possible implementation, the power supply circuit further includes: an electric quantity detection circuit;

the electric quantity detection circuit is respectively connected with the battery module and the control circuit;

the control circuit is used for detecting the battery power of the battery module through the power detection circuit when the cooking utensil is powered off and the temperature of the furnace surface is larger than or equal to a preset value, controlling the battery module to supply power to the heat dissipation module according to the battery power so as to enable the heat dissipation module to work, and/or controlling the battery module to supply power to the alarm module so as to enable the alarm module to work.

The electric quantity of the battery module is detected through the electric quantity detection circuit, a power supply strategy is determined according to the electric quantity of the battery module, and heat dissipation or alarming is achieved by utilizing the electric quantity of the battery module to the maximum extent.

In one possible implementation, the power chip circuit includes two output terminals, and a first output terminal of the power chip circuit outputs a first voltage signal; a second output end of the power supply chip circuit outputs a second voltage signal;

the battery module includes: a charging circuit, a battery and a voltage reduction circuit;

the first output end of the power chip circuit is connected with the positive electrode of the battery through the charging circuit; the voltage of a third voltage signal output by the positive electrode of the battery is equal to that of the first voltage signal;

the anode of the battery is also connected with the input end of the voltage reduction circuit; the fourth voltage signal output by the output end of the voltage reduction circuit is equal to the voltage of the second voltage signal;

the switching circuit includes: a first switching circuit and a second switching circuit;

the first output end of the power chip circuit is connected with the anode of the battery through the first switch circuit; and the output end of the second end of the power chip circuit is connected with the output end of the voltage reduction circuit through the second switch circuit.

In the power supply circuit, the power chip circuit and the battery module output two paths of different voltage signals, so that modules with different power supply requirements in the cooking utensil can normally work through power supply of the battery module after power failure.

In a possible implementation manner, the electric quantity detection circuit includes two resistors connected in series between the positive pole and the negative pole of the battery, and a connection point of the two resistors is connected with the control circuit.

In one possible implementation, the first switching circuit includes: a first diode and a second diode;

the anode of the first diode is connected with the first output end of the power chip circuit, the cathode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with the anode of the battery;

the cathode of the first diode is also grounded through a capacitor; and the cathode of the first diode is connected with the heat dissipation module.

In one possible implementation, the second switching circuit includes: a fifth diode;

the anode of the fifth diode is connected with the output end of the voltage reduction circuit, and the cathode of the fifth diode is connected with the second output end of the power chip circuit;

the cathode of the fifth diode is also grounded through a capacitor; and the cathode of the fifth diode is connected with the alarm module and the control circuit.

In a possible implementation manner, the charging circuit includes a current limiting circuit, a voltage stabilizing filter circuit and a third switching circuit, which are connected in sequence;

the current limiting circuit is connected with a first output end of the power chip circuit, and the third switch circuit is respectively connected with the control circuit and the positive electrode of the battery;

and the third switch circuit is used for controlling the charging of the battery through the first output end of the power supply chip circuit under the control of the control circuit.

In one possible implementation, the voltage stabilizing filter circuit includes: the circuit comprises a first resistor, a third diode, a first capacitor and a second capacitor;

the first end of the first resistor is connected with the current limiting circuit and the grounding point respectively, and the second end of the first resistor is connected with the anode of the third diode and the first end of the first capacitor respectively;

and the cathode of the third diode is connected with the first end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are both connected with a grounding point.

In one possible implementation, the third switching circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first triode, a second triode and a fourth diode;

the first end of the second resistor is respectively connected with the voltage-stabilizing filter circuit, the first end of the first triode and the first end of the third resistor; the second end of the second resistor is connected with the second end of the first triode and the first end of the fifth resistor respectively;

the second end of the third resistor is respectively connected with the third end of the first triode and the anode of the fourth diode; the cathode of the fourth diode is connected with the anode of the battery;

a second end of the fifth resistor is connected with a first end of the second triode, and a second end of the second triode is connected with a first end of the fourth resistor; the third end of the third diode is grounded; and the second end of the fourth resistor is connected with the control circuit.

In a possible implementation manner, the power chip circuit comprises a rectification filter circuit, a power chip and a voltage output circuit which are connected in sequence;

the rectification filter circuit is used for converting commercial power alternating current into direct current;

the power supply chip is used for reducing the voltage of the direct current and outputting the first voltage signal and the second voltage signal through the voltage output circuit.

In a second aspect, the present application provides a cooking appliance comprising a power supply circuit as described above in relation to the first aspect.

The application provides a supply circuit and cooking utensil, cooking utensil can utilize battery module to supply power for temperature detection module after the power failure for temperature detection module continues to detect the stove face temperature, and after stove face temperature more than or equal to default, control battery module is for heat radiation module and/or alarm module power supply so that its work, thereby reduces cooking utensil's potential safety hazard, has improved the security.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a first schematic structural diagram of a power supply circuit provided in the present application;

fig. 2 is a second schematic structural diagram of a power supply circuit provided in the present application;

fig. 3 is a schematic structural diagram of a power supply circuit provided in the present application;

fig. 4 is a partial circuit diagram of a power supply circuit provided in the present application;

FIG. 5 is a circuit diagram of a power chip circuit and a power down detection circuit provided in the present application;

fig. 6 is a circuit diagram of a control circuit provided in the present application;

FIG. 7 is a circuit diagram of a temperature detection circuit provided herein;

fig. 8 is a circuit diagram of a heat dissipation module provided in the present application;

fig. 9 is a circuit diagram of an alarm module provided in the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.

For a cooking appliance which uses a heating wire or a coil panel for heating, such as an electric ceramic oven or an induction cooker, the heating wire or the coil panel generates extremely high heat when the cooking appliance works, and for example, the temperature of the heating wire can reach 700 ℃ when the electric ceramic oven works. Normally, after the cooking procedure is completed, the cooking appliance controls the heat dissipation device, such as a fan, to continue to operate for a period of time, so that the temperature of the heating wire or the coil panel is reduced to a safe temperature.

However, sometimes a user may immediately unplug the power plug of the cooking appliance after cooking is completed, in this case, all modules of the cooking appliance, including the heat dissipation device thereof, may immediately stop working, and the temperature of the heating wire or the coil panel is not sufficiently lowered, thereby causing a great potential safety hazard. For example, the high temperature of the heating wire or coil disk may cause a user to be burned, or the continuous high temperature of the heating wire or coil disk causes damage to other devices in the cooking appliance.

In order to improve the safety of the cooking utensil, the application provides a power supply circuit and the cooking utensil, the power supply circuit comprises a battery module, after the cooking utensil is powered off, the control circuit controls the battery module to supply power for the temperature detection module of the cooking utensil, so that the temperature detection module can continuously detect the temperature of the furnace surface, when the temperature of the furnace surface is more than or equal to the preset value, namely when the temperature of the oven surface is higher, the battery module is further controlled to be a heat dissipation module in the cooking utensil so as to enable the heat dissipation module to work, and/or the battery module is controlled to supply power to the alarm module so as to enable the alarm module to work, wherein, the heat radiation module can rapidly reduce the temperature of the stove surface of the cooking utensil, the alarm module can prompt the user to pay attention to the high temperature of the stove surface, for example, the user is prompted to plug the power plug again to continue to operate the heat dissipation module of the cooking appliance for heat dissipation. The power supply circuit is described below with reference to specific embodiments.

Fig. 1 is a first schematic structural diagram of a power supply circuit provided in the present application. As shown in fig. 1, the power supply circuit includes: the power supply circuit comprises a power supply chip circuit 11, a power failure detection circuit 12, a battery module 13, a switch circuit 14, a temperature detection circuit 15 and a control circuit 16.

The input end of the power chip circuit 11 is connected with commercial power; the output end of the power chip circuit 11 is connected with the input end of the battery module 13; the power supply chip circuit 11 is also connected with the power failure detection circuit 12; the switch circuit 14 is respectively connected with the output end of the power chip circuit 11 and the output end of the battery module 13; the switch circuit 14 is also connected with the control circuit 16, the temperature detection circuit 15, the heat dissipation module 17 of the cooking appliance and the alarm module 18; the control circuit 16 is connected with the battery module 13, the power failure detection circuit 12, the temperature detection circuit 15, the heat dissipation module 17 and the alarm module 18 respectively.

The control circuit 16 is used for detecting whether the cooking appliance is powered off through the power-off detection circuit 12, detecting the stove surface temperature of the cooking appliance through the temperature detection circuit 15 when the cooking appliance is powered off, controlling the battery module 13 to supply power to the heat dissipation module 17 in the cooking appliance through the switch circuit 14 to enable the heat dissipation module 17 to work when the stove surface temperature is larger than a preset value, and/or controlling the battery module 13 to supply power to the alarm module 18 to enable the alarm module 18 to work.

When the cooking appliance is connected with the mains supply and works normally, the power chip circuit 11 rectifies and filters the mains supply and converts the mains supply into power supply signals required by each module in the cooking appliance. In addition, the controller may also control the battery module 13 to be charged through the power chip circuit 11.

The power-off of the cooking appliance can be that a power plug of the cooking appliance is unplugged or the power-off of a mains supply connected with the cooking appliance causes the power-off of the cooking appliance. The power-down detection circuit 12 is configured to detect a voltage signal in the power chip circuit 11, optionally, the control circuit 16 may obtain the voltage detected by the power-down detection circuit 12 according to a certain frequency, and if the voltage drops to zero, it may be determined that the cooking appliance is powered down.

The switch circuit 14 is used for controlling the power supply of the power chip circuit 11 or the battery module 13 to the modules in the cooking appliance, when the cooking appliance is not powered down, the switch circuit 14 controls the power chip circuit 11 to supply power to the modules in the cooking appliance, and when the cooking appliance is not powered down, the switch circuit 14 controls the battery module 13 to supply power to the modules in the cooking appliance which need to be powered.

After the cooking appliance is powered off, the control circuit 16 controls the battery module 13 to supply power to the temperature detection circuit 15 through the switch circuit 14, so that the temperature detection circuit 15 can continue to work. The temperature detection circuit 15 may be used to detect the temperature of the top surface of the cooking appliance. The control circuit 16 acquires the furnace surface temperature through the temperature detection circuit 15 to determine whether the furnace surface temperature is too high. Need to make sure that

For example, if the user unplugs the plug immediately after the cooking appliance is heated, the oven surface temperature may reach several hundred degrees celsius; if the user unplugs the cooking appliance just after the cooking appliance begins to operate, the oven surface temperature may not have increased. If the temperature of the furnace surface is greater than or equal to the preset value, the temperature of the furnace surface is over high, and potential safety hazards exist, at this time, the control circuit 16 controls the battery module 13 to be a heat dissipation module 17 in the cooking appliance through the switch circuit 14 so that the heat dissipation module 17 works, and/or controls the battery module 13 to supply power to the alarm module 18 so that the alarm module 18 works. On the contrary, if the temperature of the oven surface is smaller than the preset value, it indicates that the temperature of the oven surface is low, and no potential safety hazard exists, the battery module 13 is controlled to stop supplying power to the temperature detection circuit 15, and the cooking appliance is turned off.

It should be noted that the temperature detection circuit 15 may not need to be powered, for example, the temperature detection circuit 15 is the thermocouple temperature detection circuit 15, no additional power supply is needed when the thermocouple temperature detection circuit 15 operates, and the control circuit 16 may directly obtain the surface temperature of the furnace through the thermocouple temperature detection circuit 15 without controlling the battery module 13 to supply power thereto. In this case, the connection between the temperature detection circuit 15 illustrated in fig. 1 and the output of the switching circuit 14 is no longer necessary.

The heat dissipation module 17 can reduce the temperature of the surface of the cooking utensil rapidly, and the alarm module 18 can prompt the user to pay attention to the high temperature of the surface of the cooking utensil. For example, the alarm module 18 may prompt the user to plug the power plug again to continue the operation of the heat dissipation module 17 for heat dissipation. Optionally, the alarm module 18 includes at least one of a buzzer alarm module, an LED flashing module, a display module, a communication module, and a voice module. For example, the control module may send the furnace surface temperature to the display module for displaying after acquiring the furnace surface temperature detected by the temperature detection circuit 15, or the display module may also display other types of high temperature prompts according to an instruction of the control module, which is not limited in this embodiment. In an example, the communication module can send prompt information to the user terminal when working, so that a user can timely know that the cooking appliance has a high-temperature risk.

Through the power supply circuit of the embodiment, the cooking appliance can utilize the battery module 13 to supply power to the temperature detection circuit 15 after power failure, so that the temperature detection circuit 15 continues to detect the temperature of the oven surface, and after the temperature of the oven surface is greater than or equal to a preset value, the battery module 13 is controlled to supply power to the heat dissipation module 17 and/or the alarm module 18 so as to enable the heat dissipation module 17 and/or the alarm module 18 to work, so that potential safety hazards of the cooking appliance are reduced.

On the basis of the foregoing embodiments, fig. 2 is a schematic structural diagram of a power supply circuit provided in the present application. As shown in fig. 2, in addition to the power supply circuit of the above embodiment, the power supply circuit further includes: a power amount detection circuit 19; the electric quantity detection circuit 19 is connected to the battery module 13 and the control circuit 16, respectively; the power detection circuit 19 detects the power of the battery module 13.

The control circuit 16 is configured to detect a battery level of the battery module 13 through the level detection circuit 19 when the cooking appliance is powered off and the temperature of the oven surface is greater than or equal to a preset value, and control the battery module 13 to supply power to the heat dissipation module 17 according to the battery level so as to enable the heat dissipation module 17 to operate, and/or control the battery module 13 to supply power to the alarm module 18 so as to enable the alarm module 18 to operate.

In the embodiment shown in fig. 1, it has been described that the control circuit 16 is configured to control the battery module 13 to supply power to the heat dissipation module 17 to operate the heat dissipation module 17 and/or control the battery module 13 to supply power to the alarm module 18 to operate the alarm module 18 when the cooking appliance is powered off and the temperature of the oven surface is greater than or equal to the preset value. On this basis, in order to maximize the effect of the battery module 13, the power supply to the heat dissipation module 17 and/or the alarm module 18 is determined based on the amount of electricity of the battery module 13.

For example, when the power of the battery module 13 is high, the control circuit 16 may control the battery module 13 to supply power to the heat dissipation module 17 and the alarm module 18 simultaneously, so that both the heat dissipation module 17 and the alarm module 18 operate, and when the power of the battery module 13 is low, the battery module 13 may supply power to one of the heat dissipation module 17 and the alarm module 18.

For example, when the electric quantity of the battery module 13 is greater than or equal to the first threshold value, the battery module 13 is controlled to supply power to the alarm module 18 and the heat dissipation module 17 so as to enable the alarm module 18 and the heat dissipation module 17 to work; when the electric quantity of the battery module 13 is smaller than the first threshold value, the battery module 13 is controlled to supply power to the alarm module 18 so as to enable the alarm module 18 to work, or the battery module 13 is controlled to supply power to the heat dissipation module 17 so as to enable the heat dissipation module 17 to work.

When the electric quantity of the battery module 13 is high, the control circuit 16 can control the battery module 13 to supply power to the heat dissipation module 17 and the alarm module 18 simultaneously, so that the heat dissipation module 17 and the alarm module 18 work, the temperature of the cooking appliance can be timely reduced, and a user can timely notice the existence of the high-temperature risk. When the electric quantity of the battery module 13 is low, in order to avoid that the electric quantity is consumed too fast due to the simultaneous operation of the heat dissipation module 17 and the alarm module 18, and the heat dissipation module 17 cannot complete the cooling operation or the alarm prompt time is too short, the user cannot know in time, the battery module 13 can be controlled to supply power to one of the heat dissipation module 17 and the alarm module 18.

On the basis of this, the control circuit 16 may further determine when to supply power to the heat dissipation module 17 or the alarm module 18. Optionally, when the electric quantity of the battery module 13 is smaller than the first threshold and greater than or equal to the second threshold, the battery module 13 is controlled to supply power to the heat dissipation module 17 so as to enable the heat dissipation module 17 to work; and when the electric quantity of the battery module 13 is smaller than the second threshold value, controlling the battery module 13 to supply power to the alarm module 18 so as to enable the alarm module 18 to work.

Since the power consumption of the heat dissipation module 17 is high and the power consumption of the alarm module 18 is low, the battery module 13 can be further divided when the power consumption is less than the first threshold, that is, the power consumption is low. When the electric quantity of the battery module 13 is smaller than the first threshold value and greater than or equal to the second threshold value, that is, the electric quantity is relatively high, the heat dissipation module 17 is powered. When the electric quantity of the battery module 13 is smaller than the second threshold value, that is, the electric quantity is relatively low, if the battery module 13 supplies power to the heat dissipation module 17, the electric quantity of the battery module 13 may not be enough to support the heat dissipation module 17 to reduce the temperature of the cooking appliance to the safe temperature, and even only can support the heat dissipation module 17 to work for a very short time, so that no function is performed, at this time, the battery module 13 is controlled to work only for the alarm module 18, and the user is prompted by the alarm module 18 to achieve the purpose of reducing the potential safety hazard. Illustratively, the first threshold is 75% and the second threshold is 25%. In addition, can also show different colours through the LED lamp according to the battery power and instruct. The division of the electric quantity of the battery module 13 may be set according to actual conditions, which is not limited in the embodiment of the present application.

Optionally, when the electric quantity of the battery module 13 is greater than or equal to the first threshold, the battery module 13 may be further controlled to supply power to the anti-overflow module and the cookware temperature detection module of the cooking appliance. Because the temperature is still very high in the period after the power failure for cooking utensil's heater, if the pan and food wherein place on cooking utensil all the time, then still have the possibility that overflows, consequently when battery module 13's electric quantity is higher, still can be for anti-overflow module and pan temperature detection module power supply to carry out anti-overflow and detect, further improve cooking utensil's security.

In addition, in the case that the battery module 13 supplies power to the heat dissipation module 17 and/or the alarm module 18, the power consumption of the battery module 13 may be greatly changed along with the power consumption of the battery module 13, so that the power supply policy also needs to be adjusted in time according to the current power consumption of the battery module 13.

Optionally, the control circuit 16 detects the electric quantity of the battery module 13 according to a preset electric quantity detection frequency, and controls the battery module 13 to supply power to the heat dissipation module 17 in the cooking appliance to enable the heat dissipation module 17 to operate according to the last detected electric quantity of the battery module 13, and/or controls the battery module 13 to supply power to the alarm module 18 in the cooking appliance to enable the alarm module 18 to operate. That is, the control circuit 16 obtains the electric quantity of the battery module 13 according to the preset electric quantity detection frequency, and determines to supply power to the heat dissipation module 17 and/or the alarm module 18 according to the latest detected electric quantity by referring to the above method.

In addition, when the electric quantity of the battery module 13 is detected according to the preset electric quantity detection frequency, since the electric quantity is high, the change of the electric quantity may be small, and when the electric quantity is low, the change of the electric quantity in the same time may be large. Therefore, when the power of the battery module 13 is different, the power can be detected at different frequencies, thereby further saving power consumption.

For example, when the electric quantity of the battery module 13 is equal to or greater than the third threshold value, the electric quantity of the battery module 13 is detected at the first frequency; when the electric quantity of the battery module 13 is smaller than the third threshold and larger than the fourth threshold, the electric quantity of the battery module 13 is detected according to a second frequency, and the first frequency is lower than the second frequency.

The third threshold may be the same as the first threshold, and the fourth threshold may be the same as the second threshold. When the power of the battery module 13 is less than the fourth threshold, the battery module 13 may only supply power to the alarm module 18, and at this time, even if the power of the battery module 13 is detected to drop to a lower level, the battery module 13 is still controlled to supply power to the alarm module 18, so that the power of the battery module 13 may not be detected at this time.

Under the condition that the battery module 13 supplies power to the heat dissipation module 17 and/or the alarm module 18, the cooking appliance continues to detect the temperature of the oven surface through the temperature detection circuit 15, if the detected temperature of the oven surface is smaller than a preset value, the battery module 13 does not supply power to each module any more, and the cooking appliance is turned off.

Since the heat dissipation modules 17 of the cooking appliance operate for the same time when the cooking appliance is used in different environments, the temperature drop amount of the cooking appliance may be different. For example, when the cooking appliance is used in a tropical region, the temperature of the cooking appliance may be decreased by a smaller amount after the heat dissipation module 17 is operated for a certain period of time than that when the cooking appliance is used in a cold region. Therefore, when the heat dissipation module 17 works, the cooking appliance further obtains the current ambient temperature, and according to the ambient temperature, the temperature detection circuit 15 is controlled to detect the oven surface temperature according to the preset temperature detection frequency, and until the oven surface temperature is smaller than the preset value, the battery module 13 is controlled to stop supplying power to the heat dissipation module 17.

Optionally, if the ambient temperature is greater than or equal to the first temperature, controlling the temperature detection circuit 15 to detect the furnace surface temperature according to a third frequency; if the ambient temperature is lower than the first temperature, controlling the temperature detection circuit 15 to detect the temperature of the furnace surface according to a fourth frequency; the third frequency is lower than the fourth frequency.

The temperature of the cooking appliance drops slower at higher ambient temperatures and more quickly at lower ambient temperatures. Therefore, when the ambient temperature is high, the heat dissipation module 17 needs to operate for a long time, so that it is not necessary to detect the surface temperature of the furnace too frequently in this case to reduce power consumption. When the environmental temperature is low, the time required by the heat dissipation module 17 to work is short, and under the condition, the temperature of the detected furnace surface can be correspondingly increased, so that the power supply for each module is stopped when the temperature of the furnace surface is reduced to be below a preset value in time, and the electric quantity of the battery module 13 is saved.

In addition, after the cooking appliance is powered on again, the control circuit 16 may control the battery module 13 to stop supplying power to the alarm module 18 and/or the heat dissipation module 17, and control charging of the battery module 13.

For example, after cooking is finished, the user immediately unplugs the power plug, and at this time, the electric quantity of the battery module 13 is smaller than the second threshold, then the battery module 13 supplies power to the alarm module 18 to enable the alarm module 18 to work, and the alarm module 18 prompts the user that a high-temperature risk exists through voice. After hearing the voice prompt, the user plugs the power plug again, and at this time, the battery module 13 stops supplying power, the commercial power continues to supply power to the cooking appliance, and the battery module 13 can be charged.

In addition to the above embodiments, a voltage signal for supplying power to other modules by the power chip circuit 11 and the battery module 13 will be described.

Fig. 3 is a schematic structural diagram of a power supply circuit provided in the present application. As shown in fig. 3, the power chip circuit 11 includes two output terminals, and a first output terminal of the power chip circuit 11 outputs a first voltage signal; a second output terminal of the power supply chip circuit 11 outputs a second voltage signal.

The battery module 13 includes: a charging circuit 131, a battery 132, and a voltage-reducing circuit 133; a first output end of the power chip circuit 11 is connected with the positive electrode of the battery 132 through the charging circuit 131; the third voltage signal output by the positive electrode of the battery 132 is equal to the voltage of the first voltage signal; the positive electrode of the battery 132 is also connected to the input terminal of the voltage-reducing circuit 133; the fourth voltage signal output by the output terminal of the voltage-reducing circuit 133 is equal to the second voltage signal in voltage.

The switching circuit 14 includes a first switching circuit 141 and a second switching circuit 142; the first output end of the power chip circuit 11 is connected to the positive electrode of the battery 132 through the first switch circuit 141; the second terminal output terminal of the power chip circuit 11 and the output terminal of the voltage step-down circuit 133 are connected through the second switch circuit 142.

When the cooking appliance is operated, the operating voltage required by each module in the circuit is different, for example, the operating voltage commonly used by each module is 18V or 5V, and therefore, the power chip circuit 11 needs to output two voltage signals to supply power to the different modules and charge the battery module 13.

Optionally, the power chip circuit 11 includes a rectifying and filtering circuit, a power chip and a voltage output circuit, which are connected in sequence; the rectification filter circuit is used for converting commercial power alternating current into direct current; the power supply chip is used for reducing the voltage of the direct current and outputting a first voltage signal and a second voltage signal through the voltage output circuit.

The charging circuit 131 in the battery module 13 is used for charging the battery 132 by using the first voltage signal output by the power supply chip circuit 11. When the battery 132 supplies power to other modules, the voltage of the third voltage signal output by the positive electrode of the battery 132 is equal to the voltage of the first voltage signal when the power chip circuit 11 supplies power, and the voltage reduction circuit 133 is configured to reduce the voltage of the third voltage signal and output a fourth voltage signal, so that the battery 132 can supply power to different modules in the cooking appliance through the third voltage signal and the fourth voltage signal.

Illustratively, the first and third voltage signals are 18V, and the second and fourth voltage signals are 5V. The heat dissipation module 17 of the cooking appliance, such as a fan, operates by the power supply of the first voltage signal or the third voltage signal, and the alarm module 18, such as a buzzer alarm module, operates by the power supply of the second voltage signal or the fourth voltage signal.

Since the power chip circuit 11 and the battery module 13 both output two signals, the switch circuit 14 also includes two switch circuits 14, wherein the first switch circuit 141 is used for controlling the power supply by the first voltage signal or the third voltage signal, and the first switch circuit 141 is used for controlling the power supply by the second voltage signal or the fourth voltage signal.

It should be noted that the temperature detection circuit 15 illustrated in fig. 3 operates without power supply, for example, the thermocouple temperature detection circuit 15, and therefore, the connection between the temperature detection circuit 15 and the output terminal of the switching circuit 14 is not illustrated in fig. 3. If the temperature detection circuit 15 needs to be powered by the power supply, the temperature detection circuit 15 may be connected to the output terminals of the first switch circuit 141 and the second switch circuit 142 according to the power supply voltage needed by the temperature detection circuit 15 to obtain a corresponding power supply voltage signal.

On the basis of the above embodiments, the respective parts of the power supply circuit are further illustrated in conjunction with circuit diagrams.

Fig. 4 is a partial circuit diagram of a power supply circuit provided in the present application. As shown in fig. 4, on the basis of the above embodiment, the first switching circuit 141 includes: a first diode D1 and a second diode D2; the anode of the first diode D1 is connected to the first output terminal of the power chip circuit 11, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the anode of the battery 132; the cathode of the first diode D1 is also connected to ground through a capacitor; the cathode of the first diode D1 is connected to the heat sink module 17.

The second switching circuit 142 includes: a fifth diode D5; an anode of the fifth diode D5 is connected to the output terminal of the step-down circuit 133, and a cathode of the fifth diode D5 is connected to the second output terminal of the power chip circuit 11; the cathode of the fifth diode D5 is also connected to ground through a capacitor; the cathode of the fifth diode D5 is connected to the alarm module 18 and the control circuit 16.

The charge amount detection circuit 19 includes two resistors connected in series between the positive electrode and the negative electrode of the battery 132, and the connection point of the two resistors is connected to the control circuit 16.

The charging circuit 131 includes a current limiting circuit 1311, a voltage stabilizing filter circuit 1312, and a third switching circuit 1313, which are connected in this order.

The current limiting circuit 1311 is connected to the first output terminal of the power chip circuit 11, and the third switching circuit 1313 is connected to the control circuit 16 and the positive electrode of the battery 132, respectively; the third switch circuit 1313 is used to control charging of the battery 132 through the first output terminal of the power supply chip circuit 11 under the control of the control circuit 16. The current limiting circuit 1311 includes a sixth resistor R6.

The voltage stabilizing filter circuit 1312 includes: the first resistor R1, the third diode D3, the first capacitor C1 and the second capacitor C2; a first end of the first resistor R1 is connected to the current limiting circuit 1311 and the ground, respectively, and a second end of the first resistor R1 is connected to an anode of the third diode D3 and a first end of the first capacitor C1, respectively; the cathode of the third diode D3 is connected to the first terminal of the second capacitor C2, and the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are both connected to ground.

The third switching circuit 1313 circuit includes: the circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first triode Q1, a second triode Q2 and a fourth diode D4; a first end of the second resistor R2 is connected to the voltage stabilizing filter circuit 1312, a first end of the first triode Q1 and a first end of the third resistor R3 respectively; a second end of the second resistor R2 is connected to a second end of the first transistor Q1 and a first end of the fifth resistor R5, respectively; a second end of the third resistor R3 is connected to a third end of the first transistor Q1 and an anode of the fourth diode D4, respectively; the cathode of the fourth diode D4 is connected to the anode of the battery 132; a second end of the fifth resistor R5 is connected to a first end of the second transistor Q2, and a second end of the second transistor Q2 is connected to a first end of the fourth resistor R4; the third end of the third diode D3 is grounded; a second terminal of the fourth resistor R4 is connected to the control circuit 16.

In the embodiment shown in fig. 4, when the cooking appliance is not powered down, the first output terminal of the power chip circuit 11 outputs a first voltage signal, and the first voltage signal charges the battery 132 through the charging circuit 131. Specifically, the third switch circuit 1313 in the charging module receives a charging control signal from the control circuit 16, i.e., the charge signal shown in fig. 4, and when the charging control signal is at a high level, the first transistor Q1 and the second transistor Q2 are turned on to charge the battery 132; when the charging control signal is at a low level, the first transistor Q1 and the second transistor Q2 are turned off, and the charging is stopped.

When the cooking appliance is not powered down, the first voltage signal output by the first output terminal of the power chip circuit 11 makes the first diode D1 in the first switch circuit 141 conductive, so as to output 18V voltage to power other modules. The second output terminal of the power chip circuit 11 outputs a second voltage signal, which turns off the fifth diode D5 in the second switch circuit 142, so that the second voltage signal outputs a 5V voltage to power other modules.

When the cooking appliance is powered off, the first diode D1 in the first switching circuit 141 is turned off, and the third voltage signal output from the battery 132, i.e., the FDK signal shown in fig. 4, turns on the second diode D2, thereby outputting 18V voltage to power other modules. Meanwhile, the third voltage signal outputs a fourth voltage signal after passing through the voltage dropping circuit 133, and the fourth voltage signal turns on the fifth diode D5 in the second switch circuit 142, so that the fourth voltage signal outputs a 5V voltage to supply power to other modules.

On the basis of the circuit shown in fig. 4, fig. 5 to 9 respectively show circuit diagrams of the power chip circuit 11, the power failure detection circuit 12, the control circuit 16, the temperature detection circuit 15, the heat dissipation module 17 and the alarm module 18.

As shown in fig. 5, a first output terminal of the power chip circuit 11 outputs a first voltage signal, i.e., an 18V voltage signal, a second output terminal of the power chip circuit 11 outputs a second voltage signal, i.e., a 5V voltage signal, and the power down detection circuit 12 is connected to the power chip circuit 11 and outputs a power down detection signal Ac _ Vol to the control circuit 16.

Among the respective ports of the control circuit 16 shown in fig. 6, a FAN port is used to output a control signal FAN to the heat dissipation module 17 shown in fig. 8; the HeatSink _ AD port is used to output a control signal HeatSink _ AD to the alarm module 18 (buzzer alarm module) as shown in fig. 9; the charge port is used to output a charge control signal to the battery module 13 as shown in fig. 4, and the FDK port is connected to the battery module 13. The Ac _ Vol port is used to obtain a power down detection signal Ac _ Vol of the power down detection circuit 12 shown in fig. 5; the Unit1TEMP port is used to obtain a temperature detection signal Unit1TEMP of the temperature detection circuit 15 shown in fig. 7, in which TEMP1 is a thermocouple in fig. 7; the Vbat port is used to retrieve a power detection signal Vbat of the power detection circuit 19 as shown in fig. 4. The supply signal of 18V or 5V required by each module is provided by the output signals of the first and second switching circuits 141 and 142 as shown in fig. 4.

The present application further provides a cooking appliance including the power supply circuit in any of the above embodiments.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A power supply circuit, applied to a cooking appliance, comprising: the power supply control circuit comprises a power supply chip circuit (11), a power failure detection circuit (12), a battery module (13), a switch circuit (14), a temperature detection circuit (15) and a control circuit (16);

the input end of the power chip circuit (11) is connected with a mains supply; the output end of the power chip circuit (11) is connected with the input end of the battery module (13); the power supply chip circuit (11) is also connected with the power failure detection circuit (12);

the switch circuit (14) is respectively connected with the output end of the power chip circuit (11) and the output end of the battery module (13); the switch circuit (14) is also connected with the control circuit (16), the temperature detection circuit (15), a heat dissipation module (17) of the cooking appliance and an alarm module (18);

the control circuit (16) is respectively connected with the battery module (13), the power failure detection circuit (12), the temperature detection circuit (15), the heat dissipation module (17) and the alarm module (18);

control circuit (16) are used for through whether power down detection circuitry (12) detect cooking utensil falls, through temperature detection circuitry (15) detect cooking utensil's furnace face temperature, through switch circuit (14) control battery module (13) are for heat dissipation module (17) power supply is so that heat dissipation module (17) work, and/or, control battery module (13) are alarm module (18) power supply so that alarm module (18) work.

2. The power supply circuit of claim 1, further comprising: a power amount detection circuit (19);

the electric quantity detection circuit (19) is respectively connected with the battery module (13) and the control circuit (16).

3. The supply circuit according to claim 1 or 2, wherein the power chip circuit (11) comprises two output terminals, a first output terminal of the power chip circuit (11) outputting a first voltage signal; a second output end of the power supply chip circuit (11) outputs a second voltage signal;

the battery module (13) includes: a charging circuit (131), a battery (132), and a voltage-reducing circuit (133);

a first output end of the power supply chip circuit (11) is connected with the positive electrode of the battery (132) through the charging circuit (131); the third voltage signal output by the positive pole of the battery (132) is equal to the voltage of the first voltage signal;

the positive electrode of the battery (132) is also connected with the input end of the voltage reduction circuit (133); the fourth voltage signal output by the output end of the voltage reduction circuit (133) is equal to the second voltage signal in voltage;

the switching circuit (14) comprises: a first switch circuit (141) and a second switch circuit (142);

the first output end of the power chip circuit (11) is connected with the positive electrode of the battery (132) through the first switch circuit (141); and the output end of the second end of the power chip circuit (11) is connected with the output end of the voltage reduction circuit (133) through the second switch circuit (142).

4. The supply circuit according to claim 2, characterized in that said charge detection circuit (19) comprises two resistors connected in series between the positive and negative poles of said battery (132), the connection point of said two resistors being connected to said control circuit (16).

5. The supply circuit according to claim 3, characterized in that the first switching circuit (141) comprises: a first diode D1 and a second diode D2;

the anode of the first diode D1 is connected with the first output end of the power chip circuit (11), the cathode of the first diode D1 is connected with the cathode of the second diode D2, and the anode of the second diode D2 is connected with the anode of the battery (132);

the cathode of the first diode D1 is also grounded through a capacitor; the cathode of the first diode D1 is connected with the heat dissipation module (17).

6. The power supply circuit of claim 3, wherein the second switching circuit (142) comprises: a fifth diode D5;

an anode of the fifth diode D5 is connected to the output terminal of the step-down circuit (133), and a cathode of the fifth diode D5 is connected to the second output terminal of the power chip circuit (11);

the cathode of the fifth diode D5 is also connected to ground through a capacitor; the cathode of the fifth diode D5 is connected to the alarm module (18) and the control circuit (16).

7. The power supply circuit according to claim 3, wherein the charging circuit (131) comprises a current limiting circuit (1311), a voltage stabilizing filter circuit (1312) and a third switching circuit (1313) which are connected in sequence;

the current limiting circuit (1311) is connected with a first output end of the power chip circuit (11), and the third switch circuit (1313) is respectively connected with the control circuit (16) and the positive electrode of the battery (132);

the third switch circuit (1313) is used for controlling charging of the battery (132) through the first output terminal of the power supply chip circuit (11) under the control of the control circuit (16).

8. The power supply circuit of claim 7, wherein the voltage regulation filter circuit (1312) comprises: the first resistor R1, the third diode D3, the first capacitor C1 and the second capacitor C2;

a first end of the first resistor R1 is connected to the current limiting circuit (1311) and the ground point, respectively, and a second end of the first resistor R1 is connected to an anode of the third diode D3 and a first end of the first capacitor C1, respectively;

a cathode of the third diode D3 is connected to a first terminal of the second capacitor C2, and a second terminal of the first capacitor C1 and a second terminal of the second capacitor C2 are both connected to ground.

9. The power supply circuit according to claim 8, wherein the third switching circuit (1313) circuit comprises: the circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first triode Q1, a second triode Q2 and a fourth diode D4;

a first end of the second resistor R2 is respectively connected with the voltage-stabilizing filter circuit (1312), a first end of the first triode Q1 and a first end of the third resistor R3; a second end of the second resistor R2 is connected to a second end of the first transistor Q1 and a first end of the fifth resistor R5, respectively;

a second end of the third resistor R3 is connected to a third end of the first transistor Q1 and an anode of the fourth diode D4, respectively; the cathode of the fourth diode D4 is connected to the anode of the battery (132);

a second terminal of the fifth resistor R5 is connected to a first terminal of the second transistor Q2, and a second terminal of the second transistor Q2 is connected to a first terminal of the fourth resistor R4; the third end of the third diode D3 is grounded; the second end of the fourth resistor R4 is connected to the control circuit (16).

10. Cooking appliance, characterized in that it comprises a power supply circuit according to any one of claims 1 to 9.

Images