WO2018196357A1 - 电烹饪器及其加热控制电路、控制方法 - Google Patents

电烹饪器及其加热控制电路、控制方法 Download PDF

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Publication number
WO2018196357A1
WO2018196357A1 PCT/CN2017/112148 CN2017112148W WO2018196357A1 WO 2018196357 A1 WO2018196357 A1 WO 2018196357A1 CN 2017112148 W CN2017112148 W CN 2017112148W WO 2018196357 A1 WO2018196357 A1 WO 2018196357A1
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WIPO (PCT)
Prior art keywords
unit
heating unit
heating
switching unit
ptc
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Application number
PCT/CN2017/112148
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English (en)
French (fr)
Inventor
钟石刚
李信合
麻百忠
吕文灿
刘金明
梅文凯
黄开平
董凯
雷志球
Original Assignee
佛山市顺德区美的电热电器制造有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201720437312.8U external-priority patent/CN207285922U/zh
Priority claimed from CN201710271267.8A external-priority patent/CN108738168A/zh
Application filed by 佛山市顺德区美的电热电器制造有限公司 filed Critical 佛山市顺德区美的电热电器制造有限公司
Priority to KR1020197034148A priority Critical patent/KR102272895B1/ko
Priority to JP2019557769A priority patent/JP6901589B2/ja
Publication of WO2018196357A1 publication Critical patent/WO2018196357A1/zh

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices

Definitions

  • the present invention relates to the field of electrical appliances, and in particular, to a heating control circuit for an electric cooker, an electric cooker, and a heating control method for the electric cooker.
  • the rice cooker realizes the heat preservation function by the low-power heating body work provided on the side and/or the upper cover; the rice cooking function is realized by the high-power heating disk work provided at the bottom.
  • the upper cover heating body mostly uses a small power heating wire or a PTC (Positive Temperature Coefficien, positive temperature coefficient, usually a positive temperature coefficient thermistor) heater.
  • the heating wire power is stable, safer and more reliable, but the price is more expensive.
  • the power of the PTC heater can be automatically changed with temperature, the heating speed is fast, the heat preservation effect is very helpful, and the price is cheap, but due to the limitation of the production process, a short circuit may occur.
  • the PTC heater Once the PTC heater has a short-circuit fault, it may cause the entire rice cooker system to be implicated, and it is more likely that the rice cooker will burn out, which may cause the rice cooker to fail to function properly.
  • the rice cooker generally adopts a circuit as shown in FIG. 1 to realize heating and heat preservation functions.
  • the heating control circuit of this mode since the bottom heating plate H1 and the PTC heater H2 are coupled in the power supply circuit, once the PTC heater H2 is short-circuited, the entire rice cooker system may be implicated, and the rice cooker may be more likely to be burnt. Bad, resulting in the rice cooker not working properly. It can be seen that if a short circuit fault occurs in the PTC heater H2, the rice cooker can be made. Other systems are unaffected, not only improving the reliability of the rice cooker's work, but also reducing costs.
  • a first object of the present invention is to provide a heating control circuit for an electric cooker that utilizes the characteristic that the impedance of the PTC heating unit automatically changes with temperature, and can prevent the electric cooker from being damaged when the PTC heating unit is short-circuited.
  • the normal operation of the system not only improves the reliability of the electric cooker work, but also saves costs.
  • a second object of the present invention is to provide a heating control circuit for an electric cooker.
  • a third object of the present invention is to provide a heating control method for an electric cooker.
  • a first aspect of the present invention provides a heating control circuit for an electric cooker, comprising: a first heating unit; a first switching unit, the first switching unit being connected in series with the first heating unit Parallelly connected to the power supply circuit of the electric cooker; at least one PTC heating unit and at least one second switching unit, each of the at least one PTC heating unit and the at least one second switching unit Each of the second switching units is connected in series one by one, and each of the series connected PTC heating units and the second switching unit are respectively connected in parallel with the first switching unit; wherein the first heating unit and the at least one PTC heating unit The heating operation is performed according to the switching state of the first switching unit and the switching state of the at least one second switching unit.
  • the first switching unit is connected in series with the first heating unit and then connected in parallel to the power supply circuit of the electric cooking device, and each of the at least one PTC heating unit and the at least one PTC heating unit
  • Each of the second switching units is connected in series one by one, and each of the series connected PTC heating units and the second switching unit are respectively connected in parallel with the first switching unit, and the first heating unit and the at least one PTC heating unit are according to the first The switching state of the switching unit and the switching state of the at least one second switching unit perform heating operations accordingly.
  • the circuit utilizes the characteristic that the impedance of the PTC heating unit changes automatically with temperature, and can prevent the normal operation of other systems of the electric cooking device when the PTC heating unit is short-circuited, which not only improves the reliability of the electric cooking device operation, but also saves the economy. cost.
  • heating control circuit of the electric cooker according to the above embodiment of the present invention may further have the following additional technical features:
  • the at least one second switching unit is one, wherein one end of the first heating unit and the first end of the power supply loop Connected, the other end of the first heating unit is connected to one end of the first switch unit and has a first node, and the other end of the first switch unit is connected to the second end of the power supply circuit, the PTC One end of the heating unit is connected to the first node, the other end of the PTC heating unit is connected to one end of the second switch unit, and the other end of the second switch unit is connected to the second end of the power supply circuit .
  • the first heating unit when the first switching unit is in an open state and the second switching unit is in an off state, the first heating unit is heated at full power, and the PTC heating unit is not heated
  • the electric cooker maintains a current operating state if the PTC heating unit is short-circuited
  • the first heating unit when the first switching unit is in an open state and the second switching unit is in an open state Heating at full power, the PTC heating unit is not heated, wherein if the PTC heating unit is short-circuited, the electric cooker maintains a current operating state
  • the first switching unit when the first switching unit is in an off state and the When the two switch units are in an off state, the first heating unit is not heated, and the PTC heating unit is not heated, wherein if the PTC heating unit is short-circuited, the electric cooker maintains a current working state
  • the first switching unit is in an off state and the second switching unit is in an on state
  • the first heating unit is heated by micro power, the PTC Heating the thermal unit at full power, wherein
  • the first heating unit includes the bottom heating plate, and the bottom heating plate is disposed corresponding to a bottom of the electric cooker, the PTC heating unit includes a PTC heater, the PTC The heater is disposed corresponding to the upper cover of the electric cooker.
  • the first switching unit and the second switching unit are both electronic switches.
  • the first switching unit is a relay and the second switching unit is a bidirectional thyristor.
  • the electric cooker further includes: a fault detecting unit, configured to detect whether a short circuit occurs in each PTC heating unit; a control unit, the control unit and the fault detecting unit Connected, the control unit controls the second switching unit corresponding to the short-circuited PTC heating unit to turn off when the fault detecting unit detects that any one of the PTC heating units is short-circuited.
  • an embodiment of the second aspect of the present invention provides an electric cooker comprising the heating control circuit of the electric cooker according to the first aspect of the present invention.
  • the electric cooking device of the embodiment of the present invention can not affect the normal operation of other systems of the electric cooking device when the PTC heating unit is short-circuited by the heating control circuit of the electric cooking device, and can improve the reliability of the electric cooking device. It also saves costs.
  • a third aspect of the present invention provides a heating control method for an electric cooker, the electric cooker including a first heating unit, a first switching unit, at least one PTC heating unit, and at least one second a switching unit, the first switching unit is connected in series with the first heating unit and then connected in parallel to a power supply circuit of the electric cooking device, each of the at least one PTC heating unit and the at least one Each of the second switch units is connected in series one by one, and each of the series connected PTC heating units and the second switch unit are respectively connected in parallel with the first switch unit, and the heating control method includes the following steps: detecting the a switching state of the first switching unit, and detecting a switching state of the at least one second switching unit; controlling the first heating according to a switching state of the first switching unit and a switching state of the at least one second switching unit The unit and the at least one PTC heating unit perform heating operations accordingly.
  • the first heating unit and the at least one PTC heating unit are controlled to perform heating work according to the switching state of the first switching unit and the switching state of the at least one second switching unit, thereby
  • the PTC heating unit is short-circuited, it does not affect the normal operation of other systems of the electric cooking device, which not only improves the reliability of the electric cooking device. Sex can also save costs.
  • heating control method of the electric cooker according to the above embodiment of the present invention may further have the following additional technical features:
  • the at least one PTC heating unit when the at least one PTC heating unit is one, the at least one second switching unit is one, and one end of the first heating unit is connected to the first end of the power supply circuit, The other end of the first heating unit is connected to one end of the first switching unit and has a first node, and the other end of the first switching unit is connected to the second end of the power supply circuit, the PTC heating unit One end of the PTC heating unit is connected to one end of the second switch unit, and the other end of the second switch unit is connected to the second end of the power supply circuit, wherein When the first switching unit is in an open state and the second switching unit is in an off state, the first heating unit is heated at full power, and the PTC heating unit is not heated, wherein if the PTC a short circuit occurs in the heating unit, the electric cooker maintains a current working state; when the first switching unit is in an open state and the second switching unit is in an open state, the first The thermal unit is heated at full power, the PTC heating unit is not heated,
  • the heating control method of the electric cooker further includes: detecting whether a short circuit occurs in each PTC heating unit; and controlling the short-circuiting PTC heating unit when detecting a short circuit of any one of the PTC heating units The corresponding second switching unit is turned off.
  • FIG. 1 is a circuit diagram of a heating control circuit of an electric cooker in the related art
  • Figure 2 is a circuit diagram of a heating control circuit of an electric cooker according to a first embodiment of the present invention
  • Figure 3 is a circuit diagram of a heating control circuit of an electric cooker in accordance with a second embodiment of the present invention.
  • Figure 4 is a circuit diagram of a heating control circuit of an electric cooker in accordance with a third embodiment of the present invention.
  • Figure 5 is a circuit diagram of a heating control circuit of an electric cooker in accordance with a fourth embodiment of the present invention.
  • FIG. 6 is a flow chart of a heating control method of an electric cooker according to an embodiment of the present invention.
  • FIG. 7 is a flow chart of a heating control method of an electric cooker according to another embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a heating control circuit of an electric cooker according to a first embodiment of the present invention. As shown in FIG. 2, the circuit includes a first heating unit 10, a first switching unit S1, a PTC heating unit 20, and a second switching unit S2.
  • the first switch unit S1 is connected in series with the first heating unit 10 and then connected in parallel to the power supply circuit of the electric cooker.
  • the PTC heating unit 20 and the second switching unit S2 include at least one, and each of the at least one PTC heating unit 20 is connected in series with each of the second switching units S2 of the at least one second switching unit S2.
  • PTC heating unit 20 in series And the second switching unit S2 are respectively connected in parallel with the first switching unit S1.
  • the first heating unit 10 and the at least one PTC heating unit 20 perform heating operations in accordance with the switching state of the first switching unit S1 and the switching state of the at least one second switching unit S2.
  • At least one PTC heating unit 20 when at least one PTC heating unit 20 is one, at least one second switching unit S2 is one, wherein one end of the first heating unit 10 and the first end of the power supply circuit (for example, the fire line L) Connected, the other end of the first heating unit 10 is connected to one end of the first switching unit S1 and has a first node Q1, and the other end of the first switching unit S1 is connected to the second end of the power supply circuit (for example, the neutral line N).
  • the first switching unit 10 for example, the fire line L
  • the other end of the first heating unit 10 is connected to one end of the first switching unit S1 and has a first node Q1
  • the other end of the first switching unit S1 is connected to the second end of the power supply circuit (for example, the neutral line N).
  • One end of the PTC heating unit 20 is connected to the first node Q1, the other end of the PTC heating unit 20 is connected to one end of the second switching unit S2, and the other end of the second switching unit S2 is connected to the second end of the power supply circuit (for example, the neutral line N) ) connected.
  • the first heating unit 10 includes a bottom heating plate, and the bottom heating plate is disposed corresponding to the bottom of the electric cooker, the PTC heating unit 20 includes a PTC heater, and the PTC heater corresponds to the upper cover of the electric cooking device. .
  • the first heating unit 10 is a bottom heating plate, which has a large power and is responsible for the cooking heating operation of the electric cooking device.
  • the first switching unit S1 is a bottom heating plate switch, and is responsible for controlling the on and off of the bottom heating plate.
  • the PTC heating unit 20 is a PTC heater, which is responsible for the upper cover heating and heat preservation work of the electric cooker, and the second switch unit S2 is a PTC heater switch, which is responsible for controlling the on and off of the PTC heating unit 20. 2 and 3, in any case, even if the PTC heating unit 20 is short-circuited, it will ensure that the live line L and the neutral line N are always loaded, and the other systems of the electric cooking device are not implicated, thereby improving the electric cooking. The reliability of the work. Moreover, due to the lower price of the PTC, the cost of the electric cooker can be saved.
  • the first heating unit 10 when the first switching unit S1 is in the on state and the second switching unit S2 is in the off state, the first heating unit 10 is heated at full power, and the PTC heating unit 20 is not heated. Wherein, if the PTC heating unit 20 is short-circuited, the electric cooker maintains the current working state.
  • the first heating unit 10 is heated at full power, the PTC heating sheet The element 20 is not heated, wherein if the PTC heating unit 20 is short-circuited, the electric cooker maintains the current operating state.
  • the first heating unit 10 When the first switching unit S1 is in the off state and the second switching unit S2 is in the off state, the first heating unit 10 is not heated, and the PTC heating unit 20 is not heated, wherein if the PTC heating unit 20 is short-circuited, the electric cooking device Keep current working status.
  • the first heating unit 10 When the first switching unit S1 is in the off state and the second switching unit S2 is in the on state, the first heating unit 10 is heated by micro power, and the PTC heating unit 20 is heated at full power, wherein if the PTC heating unit 20 is short-circuited, The first heating unit 10 is heated at full power.
  • the first heating unit 10 performs heating operation at full power, and the PTC heating unit 20 does not operate. At this time, if the PTC heating unit 20 is short-circuited, the electric cooker maintains the current working state.
  • the PTC heating unit 20 When the first switching unit S1 is in the on state and the second switching unit S2 is in the on state, since the voltages across the PTC heating unit 20 are the same, the PTC heating unit 20 does not operate, and the first heating unit 10 performs heating operation at full power. Even if a short-circuit failure occurs at the PTC heating unit 20 at this time, the operating state of the first heating unit 10 is not affected, and the electric cooker maintains the current working state.
  • the first heating unit 10 and the PTC heating unit 20 are not operated, and if the PTC heating unit 20 is short-circuited at this time, the electric cooking device remains Current working status.
  • the first heating unit 10 and the PTC heating unit 20 perform heating operation in series. Since the impedance of the PTC heating unit 20 increases stepwise with an increase in temperature, most of the pressure drop falls on the PTC heating unit 20, and the partial pressure of the first heating unit 10 is small. Although the first heating unit 10 and the PTC heating unit 20 perform the heating operation in series, the heating power of the first heating unit 10 is actually minute, and the electric cooking device performs the heat insulating work. at this time.
  • the PTC heating unit 20 is short-circuited If the fault occurs, then the first heating unit 10 is heated at full power, and the electric cooker only loses the heat preservation function, and does not cause a short circuit between the live line L and the neutral line N, thereby avoiding the occurrence of the electric cooker burning phenomenon and improving The reliability of the electric cooker work.
  • the heating control circuit of the electric cooker according to the embodiment of the present invention, even if a short-circuit failure occurs in the PTC heating unit 20, since there is always a load between the live line L and the neutral line N, the entire electric cooker does not occur. The system burned down and improved the reliability of the electric cooker work.
  • the first switch unit S1 and the second switch unit S2 may be mechanical switches or electronic switches.
  • the first switch unit S1 and the second switch unit S2 are both electronic switches, as shown in FIG. 4, taking the PTC heating unit 20 as an example, the first switch unit S1 may be a relay, and the second switch unit S2 may be Two-way thyristor.
  • the short circuit fault of the PTC heating unit 20 can be identified to remind the user so that the user can perform the repair as soon as possible.
  • the above-described heating control circuit of the electric cooker may further include a failure detecting unit 30 and a control unit 40.
  • the fault detecting unit 30 is configured to detect whether a short circuit occurs in each of the PTC heating units 20.
  • the control unit 40 is connected to the fault detecting unit 30. When the fault detecting unit 30 detects that any one of the PTC heating units 20 is short-circuited, the control unit 40 controls the second switching unit S2 corresponding to the short-circuited PTC heating unit 20 to be turned off.
  • the fault detecting unit 30 may be a resistor for collecting a current signal, and the control unit 40 controls the second switching unit S2 according to the current signal.
  • the fault detecting unit 30 can collect a normal current signal.
  • the control unit 40 controls the corresponding second switching unit S2 to be turned off, thereby saving energy.
  • control unit 40 further The corresponding prompting unit can be controlled to issue a fault reminder to remind the user so that the user can perform the repair as soon as possible.
  • the first switching unit is connected in series with the first heating unit and then connected in parallel to the power supply circuit of the electric cooking device, and each PTC in the at least one PTC heating unit
  • the heating unit is connected in series with each of the at least one second switching unit, and each of the series connected PTC heating unit and the second switching unit are respectively connected in parallel with the first switching unit, the first heating unit and the at least one PTC
  • the heating unit performs heating operation according to the switching state of the first switching unit and the switching state of the at least one second switching unit.
  • the circuit utilizes the characteristic that the impedance of the PTC heating unit changes automatically with temperature, and can prevent the normal operation of other systems of the electric cooking device when the PTC heating unit is short-circuited, which not only improves the reliability of the electric cooking device operation, but also saves the economy. cost.
  • the circuit can also control the second switch unit corresponding to the short-circuited PTC heating unit to turn off when detecting any short circuit of the PTC heating unit to save energy.
  • the invention also proposes an electric cooker comprising the above described electric cooker heating control circuit.
  • the electric cooking device of the embodiment of the present invention can not affect the normal operation of other systems of the electric cooking device when the PTC heating unit is short-circuited by the heating control circuit of the electric cooking device, and can improve the reliability of the electric cooking device. It also saves costs.
  • the present invention also proposes a heating control method for an electric cooker, and a heating control method of the electric cooker proposed by the present invention will be described below in conjunction with specific embodiments.
  • the electric cooker comprises a first heating unit, a first switching unit, at least one PTC heating unit and at least one second switching unit, the first switching unit being connected in series with the first heating unit and then connected in parallel to the electric cooking
  • Each of the PTC heating units of the at least one PTC heating unit is in series with each of the second switching units of the at least one second switching unit, and each of the series connected PTC heating units and the second switching unit They are respectively connected in parallel with the first switching unit.
  • the heating control method of the electric cooker includes the following steps:
  • S20 Control the first heating unit and the at least one PTC heating unit to perform heating operations according to the switching state of the first switching unit and the switching state of the at least one second switching unit.
  • At least one PTC heating unit when at least one PTC heating unit is one, at least one second switching unit is one, and one end of the first heating unit is connected to the first end of the power supply circuit (for example, a live line), the first heating The other end of the unit is connected to one end of the first switching unit and has a first node, and the other end of the first switching unit is connected to a second end of the power supply circuit (for example, a neutral line), and one end of the PTC heating unit is connected to the first node.
  • the other end of the PTC heating unit is connected to one end of the second switching unit, and the other end of the second switching unit is connected to the second end of the power supply circuit (for example, a neutral line).
  • the first heating unit is heated at full power, and the PTC heating unit is not heated, wherein if the PTC heating unit is short-circuited, the electric cooking device remains Current working status.
  • the first heating unit is heated at full power, and the PTC heating unit is not heated, wherein if the PTC heating unit is short-circuited, the electric cooker maintains the current working state. .
  • the first heating unit is not heated, and the PTC heating unit is not heated, wherein if the PTC heating unit is short-circuited, the electric cooking device maintains the current operating state.
  • the first heating unit When the first switching unit is in an off state and the second switching unit is in an on state, the first heating unit is heated by micro power, and the PTC heating unit is heated at full power, wherein if the PTC heating unit is short-circuited, the first heating unit Heating at full power.
  • the first heating unit performs heating operation at full power, and the PTC heating unit does not operate. At this time, if the PTC heating unit is short-circuited, the electric cooker maintains the current working state.
  • the PTC heating unit When the first switching unit is in the on state and the second switching unit is in the on state, since the voltages across the PTC heating unit are the same, the PTC heating unit does not operate, and the first heating unit performs heating operation at full power even if the PTC heating is performed at this time. A short circuit fault occurs in the unit and does not affect the operating state of the first heating unit. The electric cooker maintains the current working state.
  • the first heating unit and the PTC heating unit perform heating operation in series. Since the impedance of the PTC heating unit increases stepwise with increasing temperature, most of the pressure drop falls on the PTC heating unit, and the partial pressure of the first heating unit is small, although the first heating unit and the PTC heating unit are connected in series. The heating work is performed. In fact, the heating power of the first heating unit is very small, and the electric cooking device performs the heat preservation work. at this time.
  • the first heating unit is heated at full power, which does not cause a short circuit between the live line and the neutral line, avoids the occurrence of electric cooker burnout, and improves the operation of the electric cooker. reliability.
  • the heating control method of the electric cooker may further include:
  • the second switching unit corresponding to the short-circuiting PTC heating unit is controlled to be turned off.
  • a current signal may be collected by the fault detecting unit to detect whether a short circuit occurs in each PTC heating unit, and then the on/off of the second switching unit is controlled according to the current signal.
  • the fault detecting unit can collect normal electricity. Stream signal.
  • the fault detecting unit cannot collect the current signal of the corresponding channel, and at this time, the corresponding second switching unit is controlled to be turned off, thereby saving energy.
  • the corresponding prompting unit can also be controlled to issue a fault reminder to remind the user so that the user can perform the repair as soon as possible.
  • the heating control method of the electric cooker according to the embodiment of the present invention can not affect the normal operation of other systems of the electric cooking device when the PTC heating unit is short-circuited, and can not only improve the reliability of the electric cooking device, but also improve the reliability of the electric cooking device. Can save costs.
  • the method can also control the second switch unit corresponding to the short-circuited PTC heating unit to turn off when detecting that any one of the PTC heating units is short-circuited to save energy.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • installation can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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  • Food Science & Technology (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)

Abstract

一种电烹饪器及其加热控制电路、控制方法，其中，加热控制电路包括：第一加热单元（10）；第一开关单元（S1），第一开关单元（S1）与第一加热单元（10）串联后并联至电烹饪器的供电回路上；至少一个PTC加热单元（20）和至少一个第二开关单元（S2），每个PTC加热单元（20）与每个第二开关单元（S2）一一对应串联，每个串联的PTC加热单元（20）和第二开关单元（S2）分别与第一开关单元（S1）并联；其中，第一加热单元（10）和PTC加热单元（20）根据第一开关单元（S1）的开关状态和第二开关单元（S2）的开关状态相应进行加热工作。该电路利用PTC加热单元（20）阻抗随温度自动变化的特性，可以在PTC加热单元（20）出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。

Description

电烹饪器及其加热控制电路、控制方法 技术领域
本发明涉及电器技术领域，特别涉及一种电烹饪器的加热控制电路、一种电烹饪器和一种电烹饪器的加热控制方法。
背景技术
对于电烹饪器具(例如电饭煲)，一般都具有煮饭和保温功能。通常，电饭煲是通过设置在侧面和/或上盖的低功率的发热体功实现保温功能；通过设置在底部的大功率发热盘功实现煮饭功能。
其中，上盖发热体大部分采用小功率发热丝或PTC(Positive Temperature Coefficien，正温度系数，通常指正温度系数的热敏电阻)加热器。发热丝功率稳定，比较安全可靠，但是价格较贵。PTC加热器的功率可以随温度自动变化，加热速度快，对保温效果有很好的帮助，且价格便宜，但是由于生产工艺的局限性，可能会出现短路的情况。一旦PTC加热器出现短路故障，可能会使整个电饭煲系统受到牵连，更有可能使电饭煲烧坏，从而造成电饭煲无法正常使用。
发明内容
本申请是基于发明人对以下问题的认识和研究做出的：
相关技术中，电饭煲一般是采用如图1所示的电路实现加热和保温功能。采用该方式的加热控制电路，由于底部发热盘H1与PTC加热器H2是并联接在供电回路中，一旦PTC加热器H2出现短路故障，可能会使整个电饭煲系统受到牵连，更有可能使电饭煲烧坏，从而造成电饭煲无法正常使用。由此可知，若能在PTC加热器H2出现短路故障时，使电饭煲的 其它系统不受影响，不仅可以提高电饭煲的工作的可靠性，还能降低成本。
本发明旨在至少在一定程度上解决上述技术中的技术问题之一。为此，本发明的第一个目的在于提出一种电烹饪器的加热控制电路，该电路利用PTC加热单元阻抗随温度自动变化的特性，可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。
本发明的第二个目的在于提出一种电烹饪器的加热控制电路。
本发明的第三个目的在于提出一种电烹饪器的加热控制方法。
为达到上述目的，本发明第一方面实施例提出了一种电烹饪器的加热控制电路，包括：第一加热单元；第一开关单元，所述第一开关单元与所述第一加热单元串联后并联至所述电烹饪器的供电回路上；至少一个PTC加热单元和至少一个第二开关单元，所述至少一个PTC加热单元中的每个PTC加热单元与所述至少一个第二开关单元中的每个第二开关单元一一对应串联，每个串联的PTC加热单元和第二开关单元分别与所述第一开关单元并联；其中，所述第一加热单元和所述至少一个PTC加热单元根据所述第一开关单元的开关状态和所述至少一个第二开关单元的开关状态相应进行加热工作。
根据本发明实施例的电烹饪器的加热控制电路，第一开关单元与第一加热单元串联后并联至电烹饪器的供电回路上，至少一个PTC加热单元中的每个PTC加热单元与至少一个第二开关单元中的每个第二开关单元一一对应串联，每个串联的PTC加热单元和第二开关单元分别与第一开关单元并联，第一加热单元和至少一个PTC加热单元根据第一开关单元的开关状态和至少一个第二开关单元的开关状态相应进行加热工作。由此，该电路利用PTC加热单元阻抗随温度自动变化的特性，可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。
另外，根据本发明上述实施例的电烹饪器的加热控制电路还可以具有如下附加的技术特征：
根据本发明的一个实施例，当所述至少一个PTC加热单元为一个时，所述至少一个第二开关单元为一个，其中，所述第一加热单元的一端与所述供电回路的第一端相连，所述第一加热单元的另一端与所述第一开关单元的一端相连且具有第一节点，所述第一开关单元的另一端与所述供电回路的第二端相连，所述PTC加热单元的一端与所述第一节点相连，所述PTC加热单元的另一端与所述第二开关单元的一端相连，所述第二开关单元的另一端与所述供电回路的第二端相连。
根据本发明的一个实施例，当所述第一开关单元处于开通状态且所述第二开关单元处于关断状态时，所述第一加热单元以全功率进行加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；当所述第一开关单元处于开通状态且所述第二开关单元处于开通状态时，所述第一加热单元以全功率进行加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；当所述第一开关单元处于关断状态且所述第二开关单元处于关断状态时，所述第一加热单元不加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；当所述第一开关单元处于关断状态且所述第二开关单元处于开通状态时，所述第一加热单元以微功率加热，所述PTC加热单元以全功率加热，其中，如果所述PTC加热单元发生短路，所述第一加热单元以全功率进行加热。
根据本发明的一个实施例，所述第一加热单元包括所述底部发热盘，且所述底部发热盘对应所述电烹饪器的底部设置，所述PTC加热单元包括PTC加热器，所述PTC加热器对应所述电烹饪器的上盖设置。
根据本发明的一个实施例，所述第一开关单元和所述第二开关单元均为电子开关。
根据本发明的一个实施例，所述第一开关单元为继电器，所述第二开关单元为双向可控硅。
根据本发明的一个实施例，上述的电烹饪器还包括：故障检测单元，所述故障检测单元用以检测每个PTC加热单元是否发生短路；控制单元，所述控制单元与所述故障检测单元相连，所述控制单元在所述故障检测单元检测到任意一个PTC加热单元发生短路时控制该发生短路的PTC加热单元所对应的第二开关单元关断。
为达到上述目的，本发明第二方面实施例提出了一种电烹饪器，包括本发明第一方面实施例所述的电烹饪器的加热控制电路。
本发明实施例的电烹饪器，通过上述的电烹饪器的加热控制电路，可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。
为达到上述目的，本发明第三方面实施例提出了一种电烹饪器的加热控制方法，所述电烹饪器包括第一加热单元、第一开关单元、至少一个PTC加热单元和至少一个第二开关单元，所述第一开关单元与所述第一加热单元串联后并联至所述电烹饪器的供电回路上，所述至少一个PTC加热单元中的每个PTC加热单元与所述至少一个第二开关单元中的每个第二开关单元一一对应串联，每个串联的PTC加热单元和第二开关单元分别与所述第一开关单元并联，所述加热控制方法包括以下步骤：检测所述第一开关单元的开关状态，并检测所述至少一个第二开关单元的开关状态；根据所述第一开关单元的开关状态和所述至少一个第二开关单元的开关状态控制所述第一加热单元和所述至少一个PTC加热单元相应进行加热工作。
根据本发明实施例的电烹饪器的加热控制方法，根据第一开关单元的开关状态和至少一个第二开关单元的开关状态控制第一加热单元和至少一个PTC加热单元相应进行加热工作，从而可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠 性，还可以节约成本。
另外，根据本发明上述实施例的电烹饪器的加热控制方法还可以具有如下附加的技术特征：
根据本发明的一个实施例，当所述至少一个PTC加热单元为一个时，所述至少一个第二开关单元为一个，所述第一加热单元的一端与所述供电回路的第一端相连，所述第一加热单元的另一端与所述第一开关单元的一端相连且具有第一节点，所述第一开关单元的另一端与所述供电回路的第二端相连，所述PTC加热单元的一端与所述第一节点相连，所述PTC加热单元的另一端与所述第二开关单元的一端相连，所述第二开关单元的另一端与所述供电回路的第二端相连，其中，当所述第一开关单元处于开通状态且所述第二开关单元处于关断状态时，所述第一加热单元以全功率进行加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；当所述第一开关单元处于开通状态且所述第二开关单元处于开通状态时，所述第一加热单元以全功率进行加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；当所述第一开关单元处于关断状态且所述第二开关单元处于关断状态时，所述第一加热单元不加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；当所述第一开关单元处于关断状态且所述第二开关单元处于开通状态时，所述第一加热单元以微功率加热，所述PTC加热单元以全功率加热，其中，如果所述PTC加热单元发生短路，所述第一加热单元以全功率进行加热。
根据本发明的一个实施例，上述的电烹饪器的加热控制方法还包括：检测每个PTC加热单元是否发生短路；当检测到任意一个PTC加热单元发生短路时，控制该发生短路的PTC加热单元所对应的第二开关单元关断。
附图说明
本发明上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中，
图1是相关技术中电烹饪器的加热控制电路的电路图；
图2是根据本发明第一个实施例的电烹饪器的加热控制电路的电路图；
图3是根据本发明第二个实施例的电烹饪器的加热控制电路的电路图；
图4是根据本发明第三个实施例的电烹饪器的加热控制电路的电路图；
图5是根据本发明第四个实施例的电烹饪器的加热控制电路的电路图；
图6是根据本发明一个实施例的电烹饪器的加热控制方法的流程图；以及
图7是根据本发明另一个实施例的电烹饪器的加热控制方法的流程图。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参考附图来描述本发明实施例提出的电烹饪器的加热控制电路、电烹饪器和电烹饪器的加热控制方法。
图2是根据本发明第一个实施例的电烹饪器的加热控制电路的电路图。如图2所示，该电路包括：第一加热单元10、第一开关单元S1、PTC加热单元20和第二开关单元S2。
其中，第一开关单元S1与第一加热单元10串联后并联至电烹饪器的供电回路上。PTC加热单元20和第二开关单元S2包括至少一个，至少一个PTC加热单元20中的每个PTC加热单元20与至少一个第二开关单元S2中的每个第二开关单元S2一一对应串联，每个串联的PTC加热单元20 和第二开关单元S2分别与第一开关单元S1并联。第一加热单元10和至少一个PTC加热单元20根据第一开关单元S1的开关状态和至少一个第二开关单元S2的开关状态相应进行加热工作。
进一步地，如图3所示，当至少一个PTC加热单元20为一个时，至少一个第二开关单元S2为一个，其中，第一加热单元10的一端与供电回路的第一端(例如火线L)相连，第一加热单元10的另一端与第一开关单元S1的一端相连且具有第一节点Q1，第一开关单元S1的另一端与供电回路的第二端(例如零线N)相连，PTC加热单元20的一端与第一节点Q1相连，PTC加热单元20的另一端与第二开关单元S2的一端相连，第二开关单元S2的另一端与供电回路的第二端(例如零线N)相连。
在本发明的实施例中，第一加热单元10包括底部发热盘，且底部发热盘对应电烹饪器的底部设置，PTC加热单元20包括PTC加热器，PTC加热器对应电烹饪器的上盖设置。
具体地，第一加热单元10为底部发热盘，功率较大，负责电烹饪器的烹饪加热工作，第一开关单元S1为底部发热盘开关，负责控制底部发热盘的通断。PTC加热单元20为PTC加热器，负责电烹饪器的上盖加热及保温工作，第二开关单元S2为PTC加热器开关，负责控制PTC加热单元20的通断。由图2和图3可知，无论何种情况，即使PTC加热单元20发生短路，都会保证火线L和零线N始终有负载存在，不会使电烹饪器的其它系统受到牵连，提高了电烹饪器工作的可靠性。并且，由于PTC的价格较低，可以节约电烹饪器的成本。
进一步地，根据本发明的一个实施例，当第一开关单元S1处于开通状态且第二开关单元S2处于关断状态时，第一加热单元10以全功率进行加热，PTC加热单元20不加热，其中，如果PTC加热单元20发生短路，电烹饪器保持当前工作状态。当第一开关单元S1处于开通状态且第二开关单元S2处于开通状态时，第一加热单元10以全功率进行加热，PTC加热单 元20不加热，其中，如果PTC加热单元20发生短路，电烹饪器保持当前工作状态。
当第一开关单元S1处于关断状态且第二开关单元S2处于关断状态时，第一加热单元10不加热，PTC加热单元20不加热，其中，如果PTC加热单元20发生短路，电烹饪器保持当前工作状态。当第一开关单元S1处于关断状态且第二开关单元S2处于开通状态时，第一加热单元10以微功率加热，PTC加热单元20以全功率加热，其中，如果PTC加热单元20发生短路，第一加热单元10以全功率进行加热。
具体地，如图3所示，当第一开关单元S1处于开通状态且第二开关单元S2处于关断状态时，第一加热单元10以全功率进行加热工作，PTC加热单元20不工作。此时，如果PTC加热单元20发生短路，电烹饪器保持当前工作状态。
当第一开关单元S1处于开通状态且第二开关单元S2处于开通状态时，由于PTC加热单元20两端的电压相同，所以PTC加热单元20不工作，第一加热单元10以全功率进行加热工作，即使此时PTC加热单元20发生短路故障，也不会对第一加热单元10的工作状态产生影响，电烹饪器保持当前工作状态。
当第一开关单元S1处于关断状态且第二开关单元S2处于关断状态时，第一加热单元10和PTC加热单元20都不工作，如果此时PTC加热单元20发生短路，电烹饪器保持当前工作状态。
当第一开关单元S1处于关断状态且第二开关单元S2处于开通状态时，第一加热单元10和PTC加热单元20串联进行加热工作。由于PTC加热单元20的阻抗会随着温度的升高呈阶跃性的增高，从而使得大部分压降落在PTC加热单元20上，第一加热单元10的分压很小。虽然第一加热单元10和PTC加热单元20串联进行加热工作，实际上第一加热单元10的加热功率很微小，电烹饪器进行保温工作。此时。如果PTC加热单元20发生短路 故障，那么第一加热单元10则以全功率进行加热，电烹饪器只是丧失了保温功能，不会使火线L和零线N之间出现短路的状况，避免电烹饪器烧毁现象的发生，提高了电烹饪器工作的可靠性。
由上述可知，根据本发明实施例的电烹饪器的加热控制电路，即使PTC加热单元20发生短路故障，由于火线L和零线N之间始终有负载存在，因此不会发生电烹饪器的整个系统出现烧毁的情况，提高了电烹饪器工作的可靠性。
可以理解，在本发明的实施例中，第一开关单元S1和第二开关单元S2可以为机械开关，也可以为电子开关。当第一开关单元S1和第二开关单元S2均为电子开关时，如图4所示，以PTC加热单元20为一个为例，第一开关单元S1可以为继电器，第二开关单元S2可以为双向可控硅。
当第一开关单元S1和第二开关单元S2采用电子开关时，可以对PTC加热单元20的短路故障进行识别，以对用户进行提醒，使用户可以尽早进行维修。具体而言，如图5所示，上述的电烹饪器的加热控制电路还可以包括故障检测单元30和控制单元40。
其中，故障检测单元30用以检测每个PTC加热单元20是否发生短路。控制单元40与故障检测单元30相连，控制单元40在故障检测单元30检测到任意一个PTC加热单元20发生短路时控制该发生短路的PTC加热单元20所对应的第二开关单元S2关断。
具体地，如图5所示，故障检测单元30可以为电阻，用以采集电流信号，控制单元40根据电流信号控制第二开关单元S2。其中，当PTC加热单元20正常工作时，故障检测单元30可采集到正常的电流信号。而当任意一个PTC加热单元20出现短路故障时，故障检测单元30采集不到相应通道的电流信号，此时控制单元40控制相应的第二开关单元S2关断即可，可以节约能源。
此外，控制单元40在将相应故障通道的第二开关单元S2关断后，还 可以控制相应的提示单元发出故障提醒，以对用户进行提醒，使用户可以尽早进行维修。
综上所述，根据本发明实施例的电烹饪器的加热控制电路，第一开关单元与第一加热单元串联后并联至电烹饪器的供电回路上，至少一个PTC加热单元中的每个PTC加热单元与至少一个第二开关单元中的每个第二开关单元一一对应串联，每个串联的PTC加热单元和第二开关单元分别与第一开关单元并联，第一加热单元和至少一个PTC加热单元根据第一开关单元的开关状态和至少一个第二开关单元的开关状态相应进行加热工作。由此，该电路利用PTC加热单元阻抗随温度自动变化的特性，可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。此外，该电路还可以在检测到任意一个PTC加热单元发生短路时，控制该发生短路的PTC加热单元所对应的第二开关单元关断，以节约能源。
本发明还提出一种电烹饪器，包括上述的电烹饪器的加热控制电路。
本发明实施例的电烹饪器，通过上述的电烹饪器的加热控制电路，可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。
此外，本发明还提出一种电烹饪器的加热控制方法，下面将结合具体的实施例来描述本发明提出的电烹饪器的加热控制方法。
图6是根据本发明一个实施例的电烹饪器的加热控制方法的流程图。其中，如图2所示，电烹饪器包括第一加热单元、第一开关单元、至少一个PTC加热单元和至少一个第二开关单元，第一开关单元与第一加热单元串联后并联至电烹饪器的供电回路上，至少一个PTC加热单元中的每个PTC加热单元与至少一个第二开关单元中的每个第二开关单元一一对应串联，每个串联的PTC加热单元和第二开关单元分别与第一开关单元并联。如图6所示，电烹饪器的加热控制方法包括以下步骤：
S10，检测第一开关单元的开关状态，并检测至少一个第二开关单元的开关状态。
S20，根据第一开关单元的开关状态和至少一个第二开关单元的开关状态控制第一加热单元和至少一个PTC加热单元相应进行加热工作。
进一步地，如图3所示，当至少一个PTC加热单元为一个时，至少一个第二开关单元为一个，第一加热单元的一端与供电回路的第一端(例如火线)相连，第一加热单元的另一端与第一开关单元的一端相连且具有第一节点，第一开关单元的另一端与供电回路的第二端(例如零线)相连，PTC加热单元的一端与第一节点相连，PTC加热单元的另一端与第二开关单元的一端相连，第二开关单元的另一端与供电回路的第二端(例如零线)相连。
其中，当第一开关单元处于开通状态且第二开关单元处于关断状态时，第一加热单元以全功率进行加热，PTC加热单元不加热，其中，如果PTC加热单元发生短路，电烹饪器保持当前工作状态。
当第一开关单元处于开通状态且第二开关单元处于开通状态时，第一加热单元以全功率进行加热，PTC加热单元不加热，其中，如果PTC加热单元发生短路，电烹饪器保持当前工作状态。
当第一开关单元处于关断状态且第二开关单元处于关断状态时，第一加热单元不加热，PTC加热单元不加热，其中，如果PTC加热单元发生短路，电烹饪器保持当前工作状态。
当第一开关单元处于关断状态且第二开关单元处于开通状态时，第一加热单元以微功率加热，PTC加热单元以全功率加热，其中，如果PTC加热单元发生短路，第一加热单元以全功率进行加热。
具体地，当第一开关单元处于开通状态且第二开关单元处于关断状态时，第一加热单元以全功率进行加热工作，PTC加热单元不工作。此时，如果PTC加热单元发生短路，电烹饪器保持当前工作状态。
当第一开关单元处于开通状态且第二开关单元处于开通状态时，由于PTC加热单元两端的电压相同，所以PTC加热单元不工作，第一加热单元以全功率进行加热工作，即使此时PTC加热单元发生短路故障，也不会对第一加热单元的工作状态产生影响，电烹饪器保持当前工作状态。
当第一开关单元处于关断状态且第二开关单元处于关断状态时，第一加热单元和PTC加热单元都不工作，如果此时PTC加热单元发生短路，电烹饪器保持当前工作状态。
当第一开关单元处于关断状态且第二开关单元处于开通状态时，第一加热单元和PTC加热单元串联进行加热工作。由于PTC加热单元的阻抗会随着温度的升高呈阶跃性的增高，从而使得大部分压降落在PTC加热单元上，第一加热单元的分压很小，虽然第一加热单元和PTC加热单元串联进行加热工作，实际上第一加热单元的加热功率很微小，电烹饪器进行保温工作。此时。如果PTC加热单元发生短路故障，那么第一加热单元则以全功率进行加热，不会使火线和零线之间出现短路的状况，避免电烹饪器烧毁现象的发生，提高了电烹饪器工作的可靠性。
由上述可知，即使PTC加热单元发生短路故障，由于火线和零线之间始终有负载存在，因此不会发生电烹饪器整个系统出现烧毁的情况，提高了电烹饪器工作的可靠性。
根据本发明的一个实施例，如图7所示，上述的电烹饪器的加热控制方法还可以包括：
S30，检测每个PTC加热单元是否发生短路。
S40，当检测到任意一个PTC加热单元发生短路时，控制该发生短路的PTC加热单元所对应的第二开关单元关断。
具体地，如图5所示，可通过故障检测单元采集电流信号，以检测每个PTC加热单元是否发生短路，然后根据电流信号控制第二开关单元的通断。其中，当PTC加热单元正常工作时，故障检测单元可采集到正常的电 流信号。而当任意一个PTC加热单元出现短路故障时，故障检测单元采集不到相应通道的电流信号，此时控制相应的第二开关单元关断即可，可以节约能源。
此外，在将相应故障通道的第二开关单元关断后，还可以控制相应的提示单元发出故障提醒，以对用户进行提醒，使用户可以尽早进行维修。
综上所述，根据本发明实施例的电烹饪器的加热控制方法，可以在PTC加热单元出现短路时不影响电烹饪器其它系统的正常工作，不仅可以提高电烹饪器工作的可靠性，还可以节约成本。此外，该方法还可以在检测到任意一个PTC加热单元发生短路时，控制该发生短路的PTC加热单元所对应的第二开关单元关断，以节约能源。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言， 可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (11)

  1. 一种电烹饪器的加热控制电路，其特征在于，包括：
    第一加热单元(10)；
    第一开关单元(S1)，所述第一开关单元(S1)与所述第一加热单元(10)串联后并联至所述电烹饪器的供电回路上；
    至少一个PTC加热单元(20)和至少一个第二开关单元(S2)，所述至少一个PTC加热单元(20)中的每个PTC加热单元(20)与所述至少一个第二开关单元(S2)中的每个第二开关单元(S2)一一对应串联，每个串联的PTC加热单元(20)和第二开关单元(S2)分别与所述第一开关单元(S1)并联；
    其中，所述第一加热单元(10)和所述至少一个PTC加热单元(20)根据所述第一开关单元(S1)的开关状态和所述至少一个第二开关单元(S2)的开关状态相应进行加热工作。
  2. 如权利要求1所述的电烹饪器的加热控制电路，其特征在于，当所述至少一个PTC加热单元(20)为一个时，所述至少一个第二开关单元(S2)为一个，其中，所述第一加热单元(10)的一端与所述供电回路的第一端相连，所述第一加热单元(10)的另一端与所述第一开关单元(S1)的一端相连且具有第一节点(Q1)，所述第一开关单元(S1)的另一端与所述供电回路的第二端相连，所述PTC加热单元(20)的一端与所述第一节点(Q1)相连，所述PTC加热单元(20)的另一端与所述第二开关单元(S2)的一端相连，所述第二开关单元(S2)的另一端与所述供电回路的第二端相连。
  3. 如权利要求2所述的电烹饪器的加热控制电路，其特征在于，
    当所述第一开关单元(S1)处于开通状态且所述第二开关单元(S2)处于关断状态时，所述第一加热单元(10)以全功率进行加热，所述PTC 加热单元(20)不加热，其中，如果所述PTC加热单元(20)发生短路，所述电烹饪器保持当前工作状态；
    当所述第一开关单元(S1)处于开通状态且所述第二开关单元(S2)处于开通状态时，所述第一加热单元(10)以全功率进行加热，所述PTC加热单元(20)不加热，其中，如果所述PTC加热单元(20)发生短路，所述电烹饪器保持当前工作状态；
    当所述第一开关单元(S1)处于关断状态且所述第二开关单元(S2)处于关断状态时，所述第一加热单元(10)不加热，所述PTC加热单元(20)不加热，其中，如果所述PTC加热单元(20)发生短路，所述电烹饪器保持当前工作状态；
    当所述第一开关单元(S1)处于关断状态且所述第二开关单元(S2)处于开通状态时，所述第一加热单元(10)以微功率加热，所述PTC加热单元(20)以全功率加热，其中，如果所述PTC加热单元(20)发生短路，所述第一加热单元(10)以全功率进行加热。
  4. 如权利要求2所述的电烹饪器的加热控制电路，其特征在于，所述第一加热单元(10)包括所述底部发热盘，且所述底部发热盘对应所述电烹饪器的底部设置，所述PTC加热单元(20)包括PTC加热器，所述PTC加热器对应所述电烹饪器的上盖设置。
  5. 如权利要求1-4中任一项所述的电烹饪器的加热控制电路，其特征在于，所述第一开关单元(S1)和所述第二开关单元(S2)为电子开关。
  6. 如权利要求2所述的电烹饪器的加热控制电路，其特征在于，所述第一开关单元(S1)为继电器，所述第二开关单元(S2)为双向可控硅。
  7. 如权利要求5所述的电烹饪器的加热控制电路，其特征在于，还包括：
    故障检测单元(30)，所述故障检测单元(30)用以检测每个PTC加热单元(20)是否发生短路；
    控制单元(40)，所述控制单元(40)与所述故障检测单元(30)相连，所述控制单元(40)在所述故障检测单元(30)检测到任意一个PTC加热单元(20)发生短路时控制该发生短路的PTC加热单元(20)所对应的第二开关单元(S2)关断。
  8. 一种电烹饪器，其特征在于，包括如权利要求1-7中任一项所述的电烹饪器的加热控制电路。
  9. 一种电烹饪器的加热控制方法，其特征在于，所述电烹饪器包括第一加热单元、第一开关单元、至少一个PTC加热单元和至少一个第二开关单元，所述第一开关单元与所述第一加热单元串联后并联至所述电烹饪器的供电回路上，所述至少一个PTC加热单元中的每个PTC加热单元与所述至少一个第二开关单元中的每个第二开关单元一一对应串联，每个串联的PTC加热单元和第二开关单元分别与所述第一开关单元并联，所述加热控制方法包括以下步骤：
    检测所述第一开关单元的开关状态，并检测所述至少一个第二开关单元的开关状态；
    根据所述第一开关单元的开关状态和所述至少一个第二开关单元的开关状态控制所述第一加热单元和所述至少一个PTC加热单元相应进行加热工作。
  10. 如权利要求9所述的电烹饪器的加热控制方法，其特征在于，当 所述至少一个PTC加热单元为一个时，所述至少一个第二开关单元为一个，所述第一加热单元的一端与所述供电回路的第一端相连，所述第一加热单元的另一端与所述第一开关单元的一端相连且具有第一节点，所述第一开关单元的另一端与所述供电回路的第二端相连，所述PTC加热单元的一端与所述第一节点相连，所述PTC加热单元的另一端与所述第二开关单元的一端相连，所述第二开关单元的另一端与所述供电回路的第二端相连，其中，
    当所述第一开关单元处于开通状态且所述第二开关单元处于关断状态时，所述第一加热单元以全功率进行加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；
    当所述第一开关单元处于开通状态且所述第二开关单元处于开通状态时，所述第一加热单元以全功率进行加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；
    当所述第一开关单元处于关断状态且所述第二开关单元处于关断状态时，所述第一加热单元不加热，所述PTC加热单元不加热，其中，如果所述PTC加热单元发生短路，所述电烹饪器保持当前工作状态；
    当所述第一开关单元处于关断状态且所述第二开关单元处于开通状态时，所述第一加热单元以微功率加热，所述PTC加热单元以全功率加热，其中，如果所述PTC加热单元发生短路，所述第一加热单元以全功率进行加热。
  11. 如权利要求9或10所述的电烹饪器的加热控制方法，其特征在于，还包括：
    检测每个PTC加热单元是否发生短路；
    当检测到任意一个PTC加热单元发生短路时，控制该发生短路的PTC加热单元所对应的第二开关单元关断。
PCT/CN2017/112148 2017-04-24 2017-11-21 电烹饪器及其加热控制电路、控制方法 WO2018196357A1 (zh)

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