CN217039748U - Control circuit for cooking appliance and cooking appliance - Google Patents
Control circuit for cooking appliance and cooking appliance Download PDFInfo
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- CN217039748U CN217039748U CN202122655799.6U CN202122655799U CN217039748U CN 217039748 U CN217039748 U CN 217039748U CN 202122655799 U CN202122655799 U CN 202122655799U CN 217039748 U CN217039748 U CN 217039748U
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Abstract
The utility model discloses a control circuit and cooking utensil for cooking utensil. The control circuit comprises an infrared heating module, an alternating current power supply module and a one-way conduction module. The infrared heating module is used for heating the food. The alternating current power supply module is connected to a mains supply and used for supplying power to the infrared heating module. The one-way conduction module is connected between the infrared heating module and the alternating current power supply module and used for conducting alternating current in a one-way mode to enable the power of the infrared heating module to be halved. According to the utility model discloses a control circuit adopts the one-way module that switches on to make infrared heating module work in the half cycle of alternating current to make infrared heating module's power halve, cooking utensil is energy-conserving, safety more.
Description
Technical Field
The utility model relates to a cooking utensil technical field relates to cooking utensil technical field particularly to cooking utensil's control circuit and cooking utensil.
Background
An existing cooking appliance such as an electric cooker is provided with an infrared heating module such as a carbon fiber pipe on a cover body, and the infrared heating module emits infrared rays with specific wave bands to assist in cooking food during cooking, so that the cooked food has stronger fragrance.
The infrared heating module is a carbon fiber tube, which mainly comprises carbon fibers at the inner part, an outer quartz tube and connecting terminals at two ends. Its rated power is determined by the resistance of its internal carbon fibers. If a carbon fiber pipe of low power is required, the carbon fiber content inside the carbon fiber pipe is required to be high and the resistance is required to be large. Two problems occur in this way, one is that the price of carbon fiber is high, and the increase of the carbon fiber content leads to the increase of the cost of the carbon fiber pipe; secondly, the carbon fiber content is high, the volume is large, a larger quartz tube is needed to place the carbon fibers, the volume of the whole carbon fiber tube is increased, the space for installing the carbon fiber tube in the cover body is also increased, and the overall shape of the cooking utensil is affected finally.
Therefore, there is a need for a control circuit of a cooking appliance and a cooking appliance to at least partially solve the above problems.
SUMMERY OF THE UTILITY MODEL
A series of concepts in a simplified form are introduced in the summary section, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.
To at least partially solve the problems in the background art, a first aspect of the present invention provides a control circuit for a cooking appliance, comprising:
the infrared heating module is used for heating the food material;
the alternating current power supply module is connected to commercial power and used for supplying power to the infrared heating module; and
and the unidirectional conduction module is connected between the infrared heating module and the alternating current power supply module and is used for unidirectionally conducting alternating current so as to reduce the power of the infrared heating module by half.
According to the utility model discloses a control circuit adopts the one-way module that switches on to make infrared heating module work in the half cycle of alternating current to make infrared heating module's power halve, cooking utensil is energy-conserving, safety more.
Optionally, the unidirectional conducting module is a diode.
According to the utility model discloses a control circuit, the one-way module that switches on adopts diode component, and the circuit is simple effective, saves product cost.
Optionally, the control circuit further comprises:
a control module;
the current detection module is used for detecting the working current of the infrared heating module and is electrically connected to the voltage input port of the control module; and
a switch module including a control terminal, a first switch terminal and a second switch terminal, the first switch terminal and the second switch terminal being connected in series with the infrared heating module, the control terminal being electrically connected to the control module,
the control module is used for switching off the switch module when the unidirectional conduction module is in short circuit.
According to the utility model discloses a control circuit establishes ties current detection module and switch module in infrared heating module's heating circuit. The working current of the infrared heating module is continuously monitored through the current detection module, if the infrared heating module continuously has current passing, the one-way conduction module is indicated to be short-circuited, the control module turns off the switch module, and therefore the heating loop of the infrared heating module is opened.
Optionally, the current detection module comprises a first resistor in series with the infrared heating module and a second resistor in series with the infrared heating module, wherein,
one end of the first resistor for coupling the second resistor is electrically connected to the control module, or one end of the second resistor for coupling the first resistor is electrically connected to the control module.
According to the utility model discloses a control circuit adopts first resistance, second resistance and infrared heating module to establish ties the form of partial pressure and detects infrared heating module's electric current.
Optionally, the switch module includes a power switch tube, a gate of the power switch tube is the control terminal, a collector of the power switch tube is the first switch terminal, and an emitter of the power switch tube is the second switch terminal.
According to the utility model discloses a control circuit adopts power switch tube as switching element.
Optionally, the switch module further comprises:
the first triode is an NPN type triode, the base electrode of the first triode is electrically connected to the control module, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is electrically connected to a low-voltage direct-current power supply;
the base electrode of the second triode is electrically connected to the collector electrode of the first triode, and the collector electrode of the second triode is grounded; and
a third triode, wherein the base of the third triode is electrically connected with the collector of the first triode, the emitter of the third triode is electrically connected with the emitter of the second triode, and the collector of the third triode is electrically connected with a low-voltage direct-current power supply,
wherein the emitter of the third triode and the emitter of the second triode are electrically connected to the gate of the power switch tube.
According to the utility model discloses a control circuit, break-make through a plurality of triode control power switch pipes.
Optionally, the control circuit further includes a zero-crossing detection module, the zero-crossing detection module is electrically connected to the ac power supply module and configured to detect a zero-crossing point of an ac power supply voltage, and the zero-crossing detection module is further electrically connected to the control module.
According to the utility model discloses a control circuit detects alternating current power supply voltage's zero crossing point through zero cross detection module, and the power switch pipe switches on in this zero crossing point department control to can protect the power switch pipe.
Optionally, the zero-crossing detection module includes:
a third resistor, a first end of the third resistor being electrically connected to the alternating current power supply module;
the anode of the second diode is electrically connected to the control module and the second end of the third resistor respectively, and the cathode of the second diode is electrically connected to a low-voltage direct-current power supply; and
a third diode having a cathode electrically connected to an anode of the second diode, the anode of the third diode being grounded.
According to the utility model discloses a control circuit detects mains voltage's zero crossing through the form of two diode series connections.
Optionally, the switch module includes a relay, two contacts of the relay are the first switch end and the second switch end, and a coil terminal of the relay is the control end.
According to the utility model discloses a control circuit can also adopt the relay as switching element.
Optionally, the switch module further comprises a transistor, a base of the transistor is electrically connected to the control module, an emitter of the transistor is grounded, and a collector of the transistor is electrically connected to the coil terminal of the relay.
According to the utility model discloses a control circuit, through triode control relay's break-make.
Optionally, the control circuit further includes an alarm module connected to the control module, and the control module is configured to control the alarm module to alarm when the voltage input port continuously receives an electrical signal in a cycle of the alternating current.
According to this use neotype control circuit, when the short circuit trouble takes place for the unidirectional flux module, can report to the police in order to indicate the user for cooking utensil is safer.
A second aspect of the present invention provides a cooking appliance, which includes the above-mentioned control circuit for a cooking appliance.
According to the utility model discloses a cooking utensil adopts infrared heating module auxiliary cooking. The infrared heating module is mainly used for generating infrared rays with the wavelength of 2-16 mu m to excite the flavor substances of food. According to the wien's displacement law, the cooking appliance does not require the infrared heating module to generate a high amount of heat, i.e., does not require the infrared heating module to be rated very high. If the temperature of the infrared heating module is too high, the temperature rise limit of components such as structural parts, electronic components and the like is easily exceeded, and the service life of the cooking utensil is influenced. According to the utility model discloses a cooking utensil can make infrared heating module work at the half cycle of alternating current through the one-way conduction module to make infrared heating module's power halve, cooking utensil is energy-conserving, safety more.
Drawings
The following drawings of the utility model are used as part of the utility model for understanding the utility model. There are shown in the drawings embodiments and descriptions thereof for illustrating the principles of the invention.
In the drawings:
fig. 1 is a cross-sectional view of a cooking appliance according to an embodiment of the present invention;
fig. 2 is a block diagram of a control circuit of a cooking appliance according to an embodiment of the present invention;
fig. 3 is a block diagram of a control circuit of a cooking appliance according to another embodiment of the present invention;
fig. 4 is a circuit diagram of a control circuit of a cooking appliance according to an embodiment of the present invention; and
fig. 5 is a circuit diagram of a control circuit of a cooking appliance according to another embodiment of the present invention.
Description of the reference numerals:
10: control module
20: current detection module
30: infrared heating module
35: carbon fiber pipe
36: reflection cover
37: light-transmitting plate
40: one-way conduction module
50: AC power supply module
60/160: switch module
65: zero-crossing detection module
70: pot body
71: inner pot
72: heating device
73: temperature measuring device
80: cover body
100: cooking utensil
200/210: control circuit
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 order to avoid obscuring embodiments of the present invention.
In the following description, a detailed process will be described in order to provide a thorough understanding of embodiments of the present invention. It is apparent that the implementation of the embodiments of the invention is not limited to the specific details known to a person skilled in the art.
The utility model provides a cooking utensil and control circuit thereof.
As shown in fig. 1, in a specific embodiment, the cooking appliance 100 may include a pot body 70 and a cover 80. Generally, the pot body 70 includes an inner pot 71, and the pot body 70 may have a cylindrical (or other) receiving portion, and the inner pot 71 may be freely put into or taken out of the receiving portion to facilitate cleaning of the inner pot 71. The inner pot 71 is made of a metal material and is constructed as a body of revolution having an opening and an inner cavity formed by the pot wall. The capacity of the inner pot 71 is usually below 6L, for example, the capacity of the inner pot 71 can be 2L or 4L.
The lid 80 may be pivotally connected to the pot body 70 by a pivot shaft for covering the pot body 70. When the cover 80 covers the pot body 70, a cooking space is formed between the cover 80 and the inner pot 71.
The cooking appliance 100 further includes a control module 10 for implementing cooking control of the cooking appliance 100. The Control module 10 may be, for example, a Micro Control Unit (MCU).
In addition, the cooking appliance 100 may further have a heating device 72 and a temperature measuring device 73. A heating device 72 (e.g., a heat-generating plate, an LC electromagnetic heating element, etc.) is generally disposed at the bottom of the pot body 70 (e.g., below the inner pot 71) for heating the inner pot 71 under the control of the control device, thereby performing a cooking function. A temperature measuring device 73 (e.g., a temperature sensor) is also typically provided at the bottom of the pot body 70 for sensing the bottom temperature of the pot body 70 (or the inner pot 71). The temperature measuring device 73 is connected to the control device of the cooking appliance 100 to feed back the sensed bottom temperature to the control device, so that the control device can achieve more precise control of, for example, the heating device 73, etc., based on the temperature information.
The infrared heating module 30 is mounted to the cover 80. The infrared heating module 30 generates infrared rays with the wavelength of 2-16 mu m during cooking, so as to cook and heat food, and the cooked food has stronger fragrance. The infrared heating module 30 includes a carbon fiber pipe 35. A reflection cover 36 is provided above the carbon fiber pipe 35 to reflect infrared light and heat emitted from the carbon fiber pipe 35 into the inner pot 71, thereby saving energy. A light-transmitting plate 37 (e.g., a glass plate) is disposed below the carbon fiber tubes 35, and the light-transmitting plate 37 can protect the carbon fiber tubes 35 while allowing infrared light and heat to pass through to the inner pot 71.
It should be noted that although a partial structure of the cooking appliance is schematically described at this time, these lists are merely exemplary and cannot be regarded as a structural limitation of the cooking appliance of the present invention.
In order to solve the problems mentioned in the background art, as shown in fig. 2, according to the present invention, a control circuit 200 connects a unidirectional conducting module 40 in series between an ac power supply module 50 and an infrared heating module 30, and the unidirectional conducting module 40 is used for unidirectional conducting ac power, thereby halving the power of the infrared heating module 30. The unidirectional conducting module 40 may be an electronic component such as a diode or a unidirectional thyristor. The unidirectional conducting module 40 may also be other circuits that can implement the unidirectional conducting function, for example, a transistor, a logic circuit, etc. Preferably, the unidirectional conducting module 40 employs a diode.
It will be appreciated that if a short circuit condition occurs in the unidirectional conducting module 40 (e.g., the diode is broken), the infrared heating module 30 will operate at full power and will not solve the problems set forth in the background. When the infrared heating module 30 operates in an originally high-power state, the use of the cooking appliance is affected, and even potential safety hazards such as fire are caused. In order to find out the short-circuit condition of the unidirectional conducting module 40 in time, as shown in fig. 3, on the basis of the control circuit 200 of the present invention, according to the present invention, the control circuit 210 connects the current detection module 20 and the switch module 60 in series in the working circuit, and couples the current detection module 20 and the switch module 60 to the control module 10 respectively, so as to protect the short-circuit failure mode of the unidirectional conducting module 40.
Specifically, the current detection module 20 functions to detect the current in the operating circuit (i.e., the current of the infrared heating module 30) and transmit the detection result to the control module 10. In the normal condition of the unidirectional conducting module 40, the operating circuit has current only in half the period of the alternating current. If the unidirectional conducting module 40 is short-circuited, there is current in the working circuit during the full cycle of the alternating current. Therefore, the control module 10 can determine the state of the one-way conduction module 40 according to the input signal of the current detection module 20, and control the switch module to be turned off when the one-way conduction module 40 is short-circuited, so that the operating circuit is opened and the infrared heating module 30 cannot operate. Generally, the switch module 60 includes a control terminal, a first switch terminal, and a second switch terminal. The first switch end and the second switch end are connected in series in the working circuit, that is, connected in series with the infrared heating module 30, the control end is electrically connected to the control module 10, and the control module 10 controls the first switch end and the second switch end to be turned on or off by controlling the level of the control end. That is, when the unidirectional conducting module 40 fails to be short-circuited, the control module 10 controls the switch module 60 to be turned off, so that the infrared heating module 30 cannot work; when the one-way conduction module 40 is normal, the control module 10 controls the switch module 60 to be conducted, so that the infrared heating module 30 works normally.
Specifically, in the embodiment shown in fig. 4, the ac power supply module 50 is composed of an L line, an N line, a current fuse F1, a varistor CNR1, and the like of ac power. The alternating current power supply module 50 supplies power to the infrared heating module 30. The live wire L, the infrared heating module 30 and the ground wire are connected to form a working circuit, namely a heating loop of the infrared heating module 30.
The unidirectional conducting module 40 is a diode D1. Because of the unidirectional conductivity of diode D1, a relatively powerful infrared heating module 30 can be operated at half its power directly, which corresponds to a reduction in the rated power by half. In this way, the infrared heating module 30 does not have an excessively high temperature, and does not exceed the temperature rise limitation of components such as structural members and electronic components, thereby ensuring the service life of the cooking appliance.
The current detection module 20 includes a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 are both connected in series in the operating circuit, i.e., the first resistor R1 is connected in series with the infrared heating module 30 and the second resistor R2 is also connected in series with the infrared heating module 30. Therefore, the operating current flowing through the infrared heating module 30 also flows through the first resistor R1 and the second resistor R2, and a voltage drop is generated across the first resistor R1 and the second resistor R2. The AD input pin P2 (voltage input port) of the control module 10 (for example, a chip U1) detects the voltage at the voltage dividing point of the resistors R1 and R2 (the point at which the resistor R1 is coupled to the resistor R2) through the resistor R7, and converts the detected voltage into a corresponding current, thereby determining the magnitude of the operating current. When the working current has a value in the whole cycle of the alternating current, it can be determined that the unidirectional flux module 40 is short-circuited.
For example, the control circuit 210 may set a threshold duration T0, such as T0 being 8 ms. When the voltage value received by the pin P2 of the control chip U1 is zero, the control chip U1 starts to count time until the voltage value received by the pin P2 is greater than zero. If the time period is greater than or equal to T0, the ac power is considered to be conducting during the half cycle, and if the time period does not reach T0, the unidirectional conducting module 40 is considered to have a short circuit fault. It is understood that the manner for determining whether the P2 pin of the control chip U1 continuously receives the electrical signal is not limited to this example.
It can be understood that the current detection module 20 utilizes the working principle of serial connection of resistors for voltage division, and if the infrared heating module 30 is also equivalent to a load resistor, the serial connection sequence of the first resistor R1, the second resistor R2 and the infrared heating module 30 does not affect the operation of the current detection module 20. In other words, the series order of the first resistor R1 → the second resistor R2 → the infrared heat module 30 (as shown in fig. 4), the infrared heat module 30 → the first resistor R1 → the second resistor R2, or the first resistor R1 → the infrared heat module 30 → the second resistor R2. Wherein, one end of the first resistor R1 for coupling the second resistor R2 is electrically connected to the control module 10, or one end of the second resistor R2 for coupling the first resistor R1 is electrically connected to the control module 10, all of which can achieve the intended function of the current detection module 20.
In the circuit shown in fig. 4, the resistor R7 functions as a current limiter, and the capacitor C3 functions as a filter for the sampled signal.
As shown in fig. 4, the switch module 60 includes a power switch IGBT. The gate pole of the power switch tube IGBT is the control end, the collector pole of the power switch tube IGBT is the first switch end, and the emitter pole of the power switch tube IGBT is the second switch end. The first switch end and the second switch end are connected in series in the working circuit, namely the first switch end and the second switch end are connected in series with the infrared heating module 30. The gate of the IGBT is coupled to the chip U1 and the IGBT is controlled to turn off when the chip U1 determines that the unidirectional conducting module 40 is shorted.
To control the power switch IGBT, the switching module 60 further includes a first transistor Q1, a second transistor Q2, and a third transistor Q3. The first transistor Q1 is an NPN transistor, a base of which is electrically connected to the control module 10 (e.g., the voltage output pin P3 of the chip U1), an emitter of which is grounded, and a collector of which is electrically connected to a low voltage dc power supply (e.g., + 18V). The second transistor Q2 is a PNP transistor having a base electrically connected to the collector of the first transistor Q1, a collector grounded, and an emitter electrically connected to the emitter of the third transistor Q3. The third transistor Q3 is an NPN transistor having a base electrically connected to the collector of the first transistor Q1, an emitter electrically connected to the emitter of the second transistor Q2, and a collector electrically connected to the low voltage dc power supply. Wherein, the emitter electrode of the third triode Q3 and the emitter electrode of the second triode Q2 are electrically connected to the gate electrode of the power switch tube IGBT. The control module 10 can control the on/off of the power switching tube IGBT by controlling the voltage of the pin P3, thereby controlling the on/off of the working circuit.
When the control module 10 determines that the unidirectional conducting module 40 is normal, the port P3 outputs low level, the transistor Q1 is cut off, so that the transistor Q3 is turned on, the gate of the IGBT obtains +18V voltage, and the IGBT is turned on, so that the operating circuit of the infrared heating module 30 is turned on. When the control module 10 determines that the unidirectional conducting module 40 is short-circuited, the control pin P3 outputs a high level, the transistor Q1 is turned on, the base of the transistor Q2 is pulled down to 0V, the transistor Q2 is turned on, the gate voltage of the IGBT is pulled down to 0V, and the IGBT is in a cut-off state, so that the working circuit of the infrared heating module 30 is turned off.
In order to protect the power switching tube IGBT, the control circuit 210 further includes a zero-crossing detection module 65. The zero-crossing detecting module 65 is electrically connected to the ac power supply module 50 for detecting a zero-crossing point of the ac power supply voltage. The zero-crossing detection module 65 is also electrically connected to the control module 10, so that the control module 10 turns on the power switch tube IGBT when the voltage value of the ac power supply crosses zero.
Specifically, the zero crossing detection module 65 includes a third resistor R3, a second diode D2, and a third diode D3. A first end of the third resistor R3 is electrically connected to the ac power module 50. The anode of the second diode D2 is electrically connected to the control module 10 (e.g. the voltage input pin P1 of the chip U1) and the second end of the third resistor R3, respectively, and the cathode of the second diode D2 is electrically connected to a low-voltage dc power supply (e.g. + 5V). The cathode of the third diode D3 is electrically connected to the anode of the second diode D2 (i.e., to the second terminals of the control module 10 and the third resistor R3, respectively), and the anode of the third diode D3 is grounded.
Zero-crossing detection module 65 is used to track changes in the waveform of the ac power supply, such as positive-to-negative or negative-to-positive zero-crossing voltage. When the ac power voltage is in the positive half cycle, the second diode D2 is turned on, and the anode voltage of the second diode D2 is slightly higher than +5V, so that the P1 pin of the control module 10 is at a high level. When the ac power voltage is at the negative half cycle, the third diode D3 is turned on, and the cathode voltage of the third diode D3 is slightly lower than 0V, so that the pin P1 of the control module 10 is at a low level. Therefore, whenever the ac power voltage crosses zero, the voltage at the P1 pin is switched between a high level and a low level, so that the control module 10 can determine the mains zero crossing and turn on the power switching tube IGBT at the same time as the mains zero crossing is detected, i.e. the P3 pin of the control module 10 outputs a low level.
In the circuit shown in fig. 4, the resistors R4 and R8 are current limiting protection resistors. The capacitor C4 is used for filtering the detection signal.
Preferably, the control circuit 210 may further include an alarm module (not shown), for example, the alarm module is connected to a P4 pin (not shown) of the control chip U1, and the control chip U1 is configured to control the alarm module to alarm through the P4 pin by the control chip U1 when the P2 pin continuously receives an electric signal in a period of alternating current (when the unidirectional conducting module 40 fails to short circuit).
Another embodiment of a control circuit 210 according to the present invention is shown in fig. 5. In this embodiment, the control circuit 210 still includes the control module 10, the current detection module 20, the infrared heating module 30, the ac power supply module 50, the unidirectional conducting module 40, and the switch module 160. To avoid redundancy, only the embodiment shown in fig. 5 differs from the embodiment shown in fig. 4.
On the one hand, as shown in fig. 5, the infrared heating module 30 is connected between the live wire L and the zero line N of the utility power, and the live wire L, the infrared heating module 30 and the zero line N form a working loop of the infrared heating module 30.
On the other hand, the embodiment shown in fig. 4 is different from the embodiment shown in fig. 4 in that the switch module 160 and the switch module 60 are different in specific configurations in the embodiment of fig. 5.
The switch module 160 includes a RELAY. Two contacts of the RELAY are the first switch end and the second switch end, and a coil terminal of the RELAY is the control end. The two contacts of the RELAY are connected in series in the heating circuit of the infrared heating module 30. One of the two coil terminals of the RELAY is electrically connected to a low voltage direct current power source (e.g., +5V), and the other of the two coil terminals of the RELAY is electrically connected to the control module 10.
Specifically, the switch module 160 further includes a transistor Q4, a base of the transistor Q4 is electrically connected to the control module 10 (e.g., a voltage output pin P10 of the chip U1), an emitter of the transistor Q4 is grounded, and a collector of the transistor Q4 is electrically connected to a coil terminal of the RELAY. The control module 10 can control the open/close state of the RELAY by controlling the voltage of the coil terminal of the RELAY, so as to control the on/off of the working circuit.
When the control module 10 determines that the unidirectional conducting module 40 is normal, the pin P10 of the chip U1 outputs a high level, the transistor Q4 is turned on, and the emitter thereof is at a low level, so that a +5V driving voltage is obtained at two ends of the coil of the RELAY, a current is generated in the coil and a magnetic field is correspondingly generated, two contacts of the RELAY are attracted, and the working circuit is turned on. When the control module 10 determines that the unidirectional conducting module 40 is short-circuited, the pin P10 of the chip U1 outputs a low level, the transistor Q4 is turned off, and the emitter thereof is at a high level, so that the voltage at two ends of the coil of the RELAY is 0V, current cannot be generated in the coil, a magnetic field cannot be generated correspondingly, two contacts of the RELAY are turned off, and the working circuit is open.
The cooking appliance 100 according to the present invention includes the control circuit 200 or 210 according to the present invention, so the cooking appliance 100 has all the features and advantageous effects of the control circuit 200 or 210.
According to the utility model discloses a cooking utensil and cooking utensil's control circuit adopts the one-way module that switches on to make infrared heating module work in the half cycle of alternating current to make infrared heating module's power halve. The control circuit is simple and effective, the product cost is saved, and the cooking utensil is safer.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.
Claims (12)
1. A control circuit for a cooking appliance, comprising:
the infrared heating module is used for heating the food;
the alternating current power supply module is connected to commercial power and used for supplying power to the infrared heating module; and
and the one-way conduction module is connected between the infrared heating module and the alternating current power supply module and is used for conducting alternating current in a one-way mode to halve the power of the infrared heating module.
2. The control circuit of claim 1, wherein the unidirectional conducting module is a diode.
3. The control circuit of claim 1, further comprising:
a control module;
the current detection module is used for detecting the working current of the infrared heating module and is electrically connected to a voltage input port of the control module; and
a switch module including a control terminal, a first switch terminal and a second switch terminal, the first switch terminal and the second switch terminal being connected in series with the infrared heating module, the control terminal being electrically connected to the control module,
the control module is used for switching off the switch module when the unidirectional conduction module is in short circuit.
4. The control circuit of claim 3, wherein the current detection module includes a first resistor in series with the infrared heating module and a second resistor in series with the infrared heating module, wherein,
one end of the first resistor for coupling the second resistor is electrically connected to the control module, or one end of the second resistor for coupling the first resistor is electrically connected to the control module.
5. The control circuit of claim 3, wherein the switch module comprises a power switch, the gate of the power switch is the control terminal, the collector of the power switch is the first switch terminal, and the emitter of the power switch is the second switch terminal.
6. The control circuit of claim 5, wherein the switch module further comprises:
the first triode is an NPN type triode, the base electrode of the first triode is electrically connected to the control module, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is electrically connected to a low-voltage direct-current power supply;
the base electrode of the second triode is electrically connected to the collector electrode of the first triode, and the collector electrode of the second triode is grounded; and
a third triode, wherein the base of the third triode is electrically connected with the collector of the first triode, the emitter of the third triode is electrically connected with the emitter of the second triode, and the collector of the third triode is electrically connected with a low-voltage direct-current power supply,
wherein the emitter of the third triode and the emitter of the second triode are electrically connected to the gate of the power switch tube.
7. The control circuit of claim 5 or 6, further comprising a zero-crossing detection module electrically connected to the AC power supply module for detecting zero-crossing points of the AC power supply voltage, the zero-crossing detection module further electrically connected to the control module.
8. The control circuit of claim 7, wherein the zero-crossing detection module comprises:
a third resistor, a first end of the third resistor being electrically connected to the alternating current power supply module;
the anode of the second diode is electrically connected to the control module and the second end of the third resistor respectively, and the cathode of the second diode is electrically connected to a low-voltage direct-current power supply; and
a third diode having a cathode electrically connected to an anode of the second diode, and an anode of the third diode being grounded.
9. The control circuit of claim 3, wherein the switch module comprises a relay, the two contacts of the relay being the first switch terminal and the second switch terminal, the coil terminal of the relay being the control terminal.
10. The control circuit of claim 9, wherein the switch module further comprises a transistor, a base of the transistor is electrically connected to the control module, an emitter of the transistor is grounded, and a collector of the transistor is electrically connected to the coil terminal of the relay.
11. The control circuit according to any one of claims 3-6 and 9-10, further comprising an alarm module connected to the control module, the control module configured to control the alarm module to alarm when the voltage input port continues to receive an electrical signal during a cycle of the alternating current.
12. A cooking appliance, characterized in that it comprises a control circuit for a cooking appliance according to any one of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122655799.6U CN217039748U (en) | 2021-10-29 | 2021-10-29 | Control circuit for cooking appliance and cooking appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122655799.6U CN217039748U (en) | 2021-10-29 | 2021-10-29 | Control circuit for cooking appliance and cooking appliance |
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| CN217039748U true CN217039748U (en) | 2022-07-26 |
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| CN202122655799.6U Active CN217039748U (en) | 2021-10-29 | 2021-10-29 | Control circuit for cooking appliance and cooking appliance |
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