CN113391572A - Control method and control circuit for cooking appliance and cooking appliance - Google Patents
Control method and control circuit for cooking appliance and cooking appliance Download PDFInfo
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- CN113391572A CN113391572A CN202010172563.4A CN202010172563A CN113391572A CN 113391572 A CN113391572 A CN 113391572A CN 202010172563 A CN202010172563 A CN 202010172563A CN 113391572 A CN113391572 A CN 113391572A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2643—Oven, cooking
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Abstract
The invention discloses a control circuit, a control method and a cooking appliance. The control method comprises the following steps: if the commercial power zero-crossing detection circuit does not detect a zero-crossing signal within a first preset time t1, judging that the cooking appliance is in a power-down state; the main control chip is switched into a low power consumption mode, the driven load is cut off, and the capacitor power supply circuit is controlled to supply power to the main control chip so as to keep the working state of the cooking appliance. This application detects mains voltage through commercial power zero passage detection circuit and whether stable to when cooking utensil is in the power failure state, cut off its driven load, and control electric capacity power supply circuit is to the main control chip power supply, and the main control chip converts the low-power consumption mode into. Because external load is all cut off, and control chip converts low-power consumption mode to, available electric capacity supply circuit supplies power, makes cooking utensil data before the power down retained, and compares in the battery power supply, and the cost is lower.
Description
Technical Field
The invention relates to the field of cooking appliances, in particular to a control method and a control circuit for a cooking appliance and the cooking appliance.
Background
When some cooking utensils at present are in working condition, when running into mains voltage fluctuation or unstable or the plug is not hard up and contact is bad, all directly get into standby state usually, wait that the voltage is stable or the socket begins work according to predetermined procedure after inserting again, this can cause great inconvenience for the user. However, in order to provide the cooking appliance with a power-down memory function without restarting the operation, data in an operating state is generally stored in a rewritable memory unit of the chip, or power is supplied using a battery when power is lost. However, the repeated erasing and writing of the chip will damage the chip, and the cost of using the battery to supply power will be high.
Therefore, it is desirable to provide a control method for a cooking appliance, a control circuit and a cooking appliance to at least partially solve the above problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
An aspect of the present invention provides a control method for a cooking appliance, the cooking appliance including: the main control chip is used for driving a load to work; the mains supply zero-crossing detection circuit is connected to the I/O port of the main control chip and is used for detecting whether mains supply supplies power to the cooking appliance; the capacitor power supply circuit supplies power through a power supply and is connected with a power supply port of the main control chip;
the control method comprises the following steps: if the commercial power zero-crossing detection circuit does not detect a zero-crossing signal within a first preset time period t1, determining that the cooking appliance is in a power-down state;
and cutting off the driven load, controlling the capacitor power supply circuit to supply power to the main control chip, and converting the main control chip into a low power consumption mode.
According to the control method, the mains supply zero-crossing detection circuit is used for detecting whether the mains supply voltage is stable, the load driven by the cooking appliance is cut off when the cooking appliance is in a power-down state, the capacitor power supply circuit is controlled to supply power to the main control chip, and the main control chip is switched into a low power consumption mode. Because external load is all cut off, and control chip converts low-power consumption mode to, available electric capacity supply circuit supplies power, makes cooking utensil data before the power down retained, and compares in the battery power supply, and the cost is lower.
Preferably, after the cooking appliance is in the power-down state, if the mains supply zero-crossing detection circuit detects the zero-crossing signal within the first preset time period t1,
and the main control chip is switched from the low power consumption mode to an awakening mode and judges whether the external voltage of the main control chip is higher than a preset reset voltage, if so, the main control chip restores the working state of the cooking appliance before the power failure state, and otherwise, the cooking appliance is controlled to enter a standby state.
Therefore, whether the cooking appliance enters the standby state or recovers the working state before the power failure state can be determined by judging the relation between the external voltage of the main control chip and the preset reset voltage.
Preferably, the first preset time period t1 is greater than or equal to 100 ms.
Another aspect of the present invention provides a control circuit for a cooking appliance, the control circuit including: the main control chip is used for driving a load to work; the mains supply zero-crossing detection circuit is connected to an I/O port of the main control chip; the capacitor power supply circuit is powered by mains supply and is connected with a power supply port of the main control chip;
wherein the master control chip is further configured to: if the commercial power zero-crossing detection circuit does not detect a zero-crossing signal within a first preset time period t1, determining that the cooking appliance is in a power-down state; and cutting off the driven load, controlling the capacitor power supply circuit to supply power to the main control chip, and converting the main control chip into a low power consumption mode.
According to the control circuit, whether the mains supply voltage is stable or not is detected through the mains supply zero-crossing detection circuit, when the cooking appliance is in a power-down state, the load driven by the cooking appliance is cut off, the capacitor power supply circuit is controlled to supply power to the main control chip, and the main control chip is switched into a low-power-consumption mode. Because external load is all cut off, and control chip converts low-power consumption mode to, available electric capacity supply circuit supplies power, makes cooking utensil data before the power down retained, and compares in the battery power supply, and the cost is lower.
Preferably, the capacitor power supply circuit comprises an electrolytic capacitor and a patch capacitor coupled in parallel.
Therefore, when the cooking utensil is in a working state, the electrolytic capacitor can store electric energy, and if the cooking utensil is in a power failure state, the electric energy in the electrolytic capacitor can be used for supplying power to the main control chip. The patch capacitor can play a role in filtering.
Preferably, the capacitor power supply circuit further comprises a first diode for inhibiting power supply to a load connected to the capacitor power supply circuit when the cooking appliance is in the power-down state.
Therefore, by arranging the first diode, when the cooking appliance is in a power-down state, the electrolytic capacitor only supplies power to the main control chip, and the power supply to peripheral loads is forbidden.
Preferably, the control circuit further includes a switch converter, the switch converter is connected to a mains supply input end, and the zero-crossing detection circuit is connected between the switch converter and the I/O port of the main control chip.
Thus, a stable voltage output can be maintained by the switching converter.
Preferably, the zero-cross detection circuit includes a voltage dividing resistor.
Therefore, after the alternating current is subjected to voltage division through the voltage division resistor, a zero-crossing signal is provided for the I/O port of the main control chip.
Preferably, the zero-crossing detection circuit further includes a second diode and a third diode, one end of the second diode is connected to a positive electrode of a power supply, the other end of the second diode is connected to the I/O port of the main control chip, one end of the third diode is grounded, and the other end of the third diode is connected to the I/O port of the main control chip.
Therefore, the second diode and the third diode play a role in clamping voltage to protect the main control chip.
According to a further aspect of the present invention, there is provided a cooking appliance comprising the control circuit of any of the above embodiments.
According to the cooking appliance, whether the mains supply voltage is stable or not is detected through the mains supply zero-crossing detection circuit, when the cooking appliance is in a power-down state, the load driven by the cooking appliance is cut off, the capacitor power supply circuit is controlled to supply power to the main control chip, and the main control chip is switched into a low-power-consumption mode. Because external load is all cut off, and control chip converts low-power consumption mode to, available electric capacity supply circuit supplies power, makes cooking utensil data before the power down retained, and compares in the battery power supply, and the cost is lower.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the drawings:
fig. 1 is a perspective view of a cooking appliance according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a control circuit for a cooking appliance, according to a preferred embodiment of the present invention; and
fig. 3 is a flowchart illustrating a control method for a cooking appliance according to a preferred embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
The invention provides a control method and a control circuit for a cooking appliance and the cooking appliance. The cooking appliance of the invention can be an electric cooker, an electric pressure cooker and the like.
A cooking appliance according to a preferred embodiment of the present invention will be described with reference to fig. 1. As shown in fig. 1, the cooking appliance 100 may include a pot body 110 and a cover 120. The pot body 110 may have an inner pot receiving part in a cylindrical shape (or other shapes), and an inner pot (not shown) may be freely put into or taken out of the inner pot receiving part to facilitate cleaning of the inner pot.
The cover 120 may be pivotally connected to the pot body 110 by a pivot shaft for covering the pot body 110, and when the cover 120 is covered to the pot body 110, a cooking space is formed between the cover 120 and the inner pot.
In addition, the cooking appliance 100 may include a control device for implementing cooking control of the cooking appliance 100. For example, the Control device may include a main Control chip 130, also called a Micro Control Unit (MCU). The cooking appliance 100 may further include a heating device (not shown) for heating the inner pan, the heating device being electrically connected to the control device.
Fig. 2 shows a control circuit for a cooking appliance according to a preferred embodiment of the present invention. The control circuit specifically includes: the main control chip 130, the commercial power zero-crossing detection circuit 140 and the capacitor power supply circuit 150.
The main control chip 130 is used for driving the load to work. The driven load may include a heating device, an operation panel, a temperature detection device, and the like electrically connected to the main control chip 130.
The mains zero-crossing detection circuit 140 is used to detect whether the mains voltage is normal, and is connected to an I/O port of the main control chip 130, i.e. the P20 port shown in fig. 2.
The mains zero-crossing detection circuit 140 may comprise a voltage dividing resistor R204, a second diode D202 and a third diode D203. The alternating current is divided by the voltage dividing resistor R204 and then provides a zero crossing signal to the P20 port of the main control chip 130. The value range of the divider resistor R204 is 200K-1000K. The divider resistor R204 is 470K. In this embodiment, one end of the second diode D202 is connected to the positive electrode of the power supply, the other end is connected to the P20 port of the main control chip 130, one end of the third diode is grounded, and the other end is connected to the P20 port. The second diode D202 and the third diode D203 function as a clamping voltage, and may be used to protect the main control chip 130. As can be understood with reference to fig. 2, the power supply voltage of the main control chip 130 is 5V.
Typically, the control circuit may further comprise a switching converter (not shown in the figure). The switch converter is connected with the mains supply input end and used for providing stable voltage. The zero crossing detection circuit may be connected between the switching converter and the P20 port of the master control chip 130.
With continued reference to fig. 2, the capacitive power supply circuit 150 is connected to the VDD port of the main control chip 130. The capacitive powering circuit 150 may include an electrolytic capacitor C201 and a patch capacitor C202 coupled in parallel. Therefore, when the cooking appliance is in a working state, the electrolytic capacitor C201 can store electric energy, and if the cooking appliance is in a power-down state, the electric energy in the electrolytic capacitor C201 can be used for supplying power to the main control chip 130. The patch capacitance C202 may act as a filter. In the present embodiment, the electrolytic capacitor C201 has a specification of 10V/16V, 470uF-2200 uF.
Further, the capacitor power supply circuit 150 may further include a first diode D201. The first diode D201 is used to disable power supply to a load (peripheral circuit) connected to the capacitive power supply circuit 150 when the cooking appliance is in a power-down state.
As shown in fig. 2, the P10 port of the main control chip 130 is connected to an electronic switch circuit. The electronic switching circuit may control the state of peripheral loads (indicator lights, etc.) connected to the main control chip 130. In the present embodiment, a temperature detection circuit is connected to the electronic switch circuit.
The principle of the control circuit of the present invention will be described in detail below with reference to fig. 2 and 3.
After the cooking appliance is plugged in the power supply, the commercial power supplies power to the cooking appliance, due to the characteristic of alternating current, the P20 port of the main control chip 130 detects a zero-crossing signal every other preset time, the main control chip 130 generates external interruption through the zero-crossing signal, the main control chip 130 is in an awakening state (awakening mode) due to the external interruption, and the cooking appliance works normally.
In the process that the commercial power supplies power to the cooking appliance, the electrolytic capacitor C201 stores the electric energy to release the electric energy when the power is off, and the P10 port of the main control chip 130 outputs a high level. As shown in fig. 2, the transistor VT2 is turned on, pulling the base of the transistor VT1 low. When the base of the transistor VT1 is at low level, the transistor VT1 is turned on, and the temperature detection circuit can work normally.
If the cooking appliance is powered off due to reasons such as poor power contact, the zero-cross detection circuit cannot detect a zero-cross signal, which indicates that the cooking appliance is in a power-off state, and the main control chip 130 cannot generate external interruption, so that the main control chip 130 cuts off a driven load (for example, cuts off the temperature detection circuit), controls the capacitor power supply circuit 150 (the electrolytic capacitor C201) to supply power to the main control chip 130, the main control chip 130 is switched to a low power consumption mode, and working data before power-off is retained.
As shown in fig. 2, after the cooking appliance is in the power-off state, the P10 port of the main control chip 130 outputs a low level. The transistor VT2 is turned off, and the transistor VT1 pulls the base potential high through the resistor R201. The transistor VT1 is also turned off, and the temperature detection circuit is turned off from the host chip 130.
After the cooking appliance is powered on again, the zero-crossing detection circuit detects the zero-crossing signal again, the main control chip 130 is awakened through external interruption, the main control chip 130 judges whether the external voltage is higher than a preset reset voltage, if yes, the main control chip 130 restores the working state of the cooking appliance before the power-down state to continue working, and otherwise, the cooking appliance is controlled to enter a standby state.
The invention also provides a control method for the cooking appliance. The method comprises the following steps:
if the commercial power zero-crossing detection circuit 140 does not detect a zero-crossing signal within a first preset time period t1, determining that the cooking appliance is in a power-down state;
the driven load is cut off, and the capacitor power supply circuit 150 is controlled to supply power to the main control chip 130, and the main control chip 130 is switched to the low power consumption mode.
The range of the first preset duration t1 may be: t1 is more than or equal to 100 ms.
Further, after the cooking appliance is in the power-off state, if the mains supply zero-crossing detection circuit 140 detects a zero-crossing signal within the first preset time period t1,
the main control chip 130 is switched from the low power consumption mode to the wake-up mode, and determines whether the external voltage of the main control chip 130 is higher than a preset reset voltage, if so, the main control chip 130 restores the working state of the cooking appliance before the power-down state, otherwise, the cooking appliance is controlled to enter the standby state.
The method of the present invention can be understood from the above detailed description of the operating principle of the control circuit, and therefore, for brevity of the text, the detailed description is omitted.
The invention also provides a cooking appliance comprising the control circuit of any one of the above embodiments.
According to the control circuit, the control method and the cooking utensil, whether mains supply voltage is stable or not is detected through the mains supply zero-crossing detection circuit, when the cooking utensil is in a power-down state, a load driven by the cooking utensil is cut off, the capacitor power supply circuit is controlled to supply power to the main control chip, and the main control chip is converted into a low-power-consumption mode. Because external load is all cut off, and control chip converts the low-power consumption mode into to, available electric capacity supply circuit supplies power, makes cooking utensil data before the power failure reserved, and compare in battery power supply, the cost is lower, is more suitable for the condition of short-time outage.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A control method for a cooking appliance, characterized in that the cooking appliance comprises:
the main control chip is used for driving a load to work;
the mains supply zero-crossing detection circuit is connected to the I/O port of the main control chip and is used for detecting whether mains supply supplies power to the cooking appliance; and
the capacitor power supply circuit supplies power through a power supply and is connected with a power supply port of the main control chip;
the control method comprises the following steps:
if the commercial power zero-crossing detection circuit does not detect a zero-crossing signal within a first preset time period t1, determining that the cooking appliance is in a power-down state;
and cutting off the driven load, controlling the capacitor power supply circuit to supply power to the main control chip, and converting the main control chip into a low power consumption mode.
2. The control method for the cooking appliance according to claim 1, wherein after the cooking appliance is in the power-down state, if the mains zero-crossing detection circuit detects the zero-crossing signal within the first preset time period t1,
and the main control chip is switched from the low power consumption mode to an awakening mode and judges whether the external voltage of the main control chip is higher than a preset reset voltage, if so, the main control chip restores the working state of the cooking appliance before the power failure state, and otherwise, the cooking appliance is controlled to enter a standby state.
3. The control method for a cooking appliance according to claim 1, wherein the first preset time period t1 is greater than or equal to 100 ms.
4. A control circuit for a cooking appliance, the control circuit comprising:
the main control chip is used for driving a load to work;
the mains supply zero-crossing detection circuit is connected to an I/O port of the main control chip; and
the capacitor power supply circuit is powered by mains supply and is connected with a power supply port of the main control chip;
wherein the master control chip is further configured to: if the commercial power zero-crossing detection circuit does not detect a zero-crossing signal within a first preset time period t1, determining that the cooking appliance is in a power-down state;
and cutting off the driven load, controlling the capacitor power supply circuit to supply power to the main control chip, and converting the main control chip into a low power consumption mode.
5. The control circuit for a cooking appliance according to claim 4, wherein the capacitive powering circuit comprises an electrolytic capacitor and a patch capacitor coupled in parallel.
6. The control circuit for a cooking appliance according to claim 5, wherein the capacitive power supply circuit further comprises a first diode for disabling a load connected to the capacitive power supply circuit from supplying power when the cooking appliance is in the power-down state.
7. The control circuit for the cooking appliance according to claim 4, wherein the control circuit further comprises a switching converter, the switching converter is connected with a mains input, and the zero-crossing detection circuit is connected between the switching converter and the I/O port of the main control chip.
8. The control circuit for a cooking appliance according to claim 7, wherein the zero-cross detection circuit includes a voltage dividing resistor.
9. The control circuit for the cooking utensil of claim 8, wherein the zero-crossing detection circuit further comprises a second diode and a third diode, wherein one end of the second diode is connected with a positive electrode of a power supply, the other end of the second diode is connected with the I/O port of the main control chip, one end of the third diode is grounded, and the other end of the third diode is connected with the I/O port of the main control chip.
10. A cooking appliance comprising the control circuit of any one of claims 4-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010172563.4A CN113391572A (en) | 2020-03-12 | 2020-03-12 | Control method and control circuit for cooking appliance and cooking appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010172563.4A CN113391572A (en) | 2020-03-12 | 2020-03-12 | Control method and control circuit for cooking appliance and cooking appliance |
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| CN113391572A true CN113391572A (en) | 2021-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010172563.4A Pending CN113391572A (en) | 2020-03-12 | 2020-03-12 | Control method and control circuit for cooking appliance and cooking appliance |
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Cited By (1)
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| WO2024141021A1 (en) * | 2022-12-30 | 2024-07-04 | 广东美的厨房电器制造有限公司 | Cooking device |
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