CN207491225U - Heat-preservation control circuit and electric heating equipment - Google Patents

Heat-preservation control circuit and electric heating equipment Download PDF

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Publication number
CN207491225U
CN207491225U CN201721739141.0U CN201721739141U CN207491225U CN 207491225 U CN207491225 U CN 207491225U CN 201721739141 U CN201721739141 U CN 201721739141U CN 207491225 U CN207491225 U CN 207491225U
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China
Prior art keywords
heater
circuit
driving switch
heat
driving
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CN201721739141.0U
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Inventor
钟石刚
李信合
麻百忠
吕文灿
刘金明
梅文凯
黄开平
袁宏斌
董凯
雷志球
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Abstract

The utility model discloses a kind of electric heating equipment and heat-preservation control circuit, which includes PTC upper covers heater, bottom heater, fault detection circuit, the first driving switch, bottom heater driving circuit and master controller;The first end of bottom heater is connect with negative electricity source, output terminal of the second end of bottom heater respectively with the first end of PTC upper cover heaters, the test side of fault detection circuit and bottom heater driving circuit is connect, and the controlled end of bottom-heated driving circuit and the first control terminal of master controller connect;The output terminal of fault detection circuit and the signal feedback end of master controller connect;The second end of PTC upper cover heaters is connect with the first conduction terminal of the first driving switch, and the second conduction terminal of the first driving switch is connect with cathode power supply end, and the controlled end of the first driving switch and the second control terminal of master controller connect.The utility model solves the problems, such as ptc heater short circuit and is burned out ptc heater and late-class circuit.

Description

Heat-preservation control circuit and electric heating equipment
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of heat-preservation control circuit and electric heating equipment.
Background technology
In the electric heating equipments such as most of electric cookers, it is usually provided with bottom heat-generating disc, side heater and upper cover hair Hot body, side heater and upper cover heater power are smaller, thus are usually used in keeping the temperature, and bottom heat-generating disc power is larger, therefore main It is used to cook.Wherein, upper cover heater is mainly realized using low power ptc heater, and ptc heater power becomes automatically Change, heating speed is fast, has good help to heat insulation effect, and cost is relatively low.But ptc heater is due to production technology Reason is susceptible to that electric current is excessive, the failures such as short-circuit, and ptc heater be usually arranged in parallel AC power zero, fire leads Between line, thus other circuit modules in electric heating equipment is easily caused to be damaged.
Utility model content
The main purpose of the utility model is to propose a kind of heat-preservation control circuit and electric heating equipment, it is intended to solve electrical heating Lead to ptc heater and the impaired problem of late-class circuit since ptc heater is easily short-circuit in equipment.
To achieve the above object, the utility model proposes a kind of heat-preservation control circuit, applied in electric heating equipment, institute State heat-preservation control circuit include for the cathode power supply end of incoming transport power supply and negative electricity source and PTC upper covers heater, Bottom heater, for detecting whether the PTC upper covers heater fault detection circuit of short trouble occurs, for driving State the first driving switch of PTC upper covers heater work, the bottom heater for the bottom heater to be driven to work drives Circuit and the master controller for controlling first driving switch and bottom heater drive circuit works;Wherein,
The first end of the bottom heater is connect with the negative electricity source, the second end difference of the bottom heater The test side of first end, the fault detection circuit with the PTC upper covers heater and the bottom heater driving circuit Output terminal connection, the first control terminal of the controlled end of the bottom-heated driving circuit and master controller connects;The failure The output terminal of detection circuit is connect with the signal feedback end of the master controller;The second end of the PTC upper covers heater and institute State the first conduction terminal connection of the first driving switch, the second conduction terminal of first driving switch and the cathode power supply end and The input terminal interconnection of the bottom heater driving circuit, the of the controlled end of first driving switch and the master controller Two control terminals connect.
Preferably, the fault detection circuit includes first resistor, second resistance and the first capacitance, the first resistor First end is the test side of the fault detection circuit, the first end of the second end of the first resistor and the second resistance and The end of the first end interconnection of first capacitance, the second end of the second resistance and first capacitance is grounded;Described The common end of one resistance and the second resistance is the output terminal of the fault detection circuit.
Preferably, the bottom heater driving circuit includes first switch pipe, 3rd resistor and relay, the relay Device includes coil, stationary contact and movable contact, and the controlled end of the first switch pipe is through the 3rd resistor and the master controller Connection, the first conduction terminal of the first switch pipe are connect with the first end of the coil, and the second of the first switch pipe leads Go side is grounded;The second end of the coil is connect with the first DC power supply, and the movable contact is bottom heater driving electricity The input terminal on road, the stationary contact are the output terminal of the bottom heater driving circuit.
Preferably, the heat-preservation control circuit further includes side heater and the second driving switch, the side heater First end connect with the negative electricity source, the second end of the side heater is led with the first of second driving switch Go side connects;Second conduction terminal of second driving switch is connect with the cathode power supply end;Second driving switch Controlled end is connect with the third control terminal of the master controller.
Preferably, first driving switch and/or second driving switch are bidirectional triode thyristor, first driving First conduction terminal of switch and the first conduction terminal of second driving switch correspond to the first main electrode of the bidirectional triode thyristor; Second conduction terminal of first driving switch and second driving switch corresponds to the second main electrode of the bidirectional triode thyristor; The controlled end of first driving switch and second driving switch corresponds to the gate pole of the bidirectional triode thyristor.
Preferably, the heat-preservation control circuit further includes the first current-limiting resistance and the second current-limiting resistance, first current limliting Resistance series connection is set between the controlled end of first driving switch and the second control terminal of the master controller, and described second Current-limiting resistance is arranged in series between the controlled end of second driving switch and the third control terminal of the master controller.
Preferably, the heat-preservation control circuit further includes to detect PTC upper covers heater and/or the bottom heater The temperature sensor of heating temperature, the temperature sensor are arranged on the electric heating equipment.
Preferably, the heat-preservation control circuit further includes the power supply processing circuit for powering to the master controller, institute It states the electrode input end of power supply processing circuit and negative input corresponds to connect with the cathode power supply end and negative electricity source respectively It connects, the output terminal of the power supply processing circuit is connect with the power end of the master controller.
Preferably, the heat-preservation control circuit further includes the operation display circuit being electrically connected with the master controller.
The utility model also proposes a kind of electric heating equipment, and the electric heating equipment includes preservation and controlling as described above electricity Road, the heat-preservation control circuit include adding for the cathode power supply end of incoming transport power supply and negative electricity source and PTC upper covers Whether hot device, bottom heater there is the fault detection circuit of short trouble for detecting the PTC upper covers heater, are used for The first driving switch for driving PTC upper covers heater work, the bottom-heated for driving the bottom heater work Device driving circuit and the master controller for controlling first driving switch and bottom heater drive circuit works;Its In, the first end of the bottom heater is connect with the negative electricity source, the second end of the bottom heater respectively with institute State the defeated of the first end of PTC upper cover heaters, the test side of the fault detection circuit and the bottom heater driving circuit Outlet connects, and the controlled end of the bottom-heated driving circuit and the first control terminal of master controller connect;The fault detect The output terminal of circuit is connect with the signal feedback end of the master controller;The second end of the PTC upper covers heater and described the The first conduction terminal connection of one driving switch, the second conduction terminal of first driving switch and the cathode power supply end and described The input terminal interconnection of bottom heater driving circuit, the controlled end of first driving switch and the second control of the master controller End connection processed.
The utility model is by setting master controller, and when receiving heating key command input by user, with default Heating time controls bottom heater drive circuit works, so as to which bottom heater be driven to work, and generates heat at a high speed, to heat electricity Object in rice cooker.Meanwhile the first driving switch of main controller controls turns off, PTC upper covers heater does not work at this time, works as heating When time reaches default heating time, main controller controls bottom heater driving circuit is stopped, and controls the first driving Switch conduction, so as to which PTC upper covers heater and bottom heater be driven to work, to be kept the temperature to the object in electric cooker.Therefore Barrier detection circuit detects the operating current of PTC upper cover heaters, and current detection signal is exported to master controller in real time, works as inspection Measure flow through PTC upper cover heaters electric current be more than PTC upper cover heaters predetermined current rotection thresholds when, main controller controls First driving switch disconnects, and PTC upper cover heaters to be driven to be stopped, so as to protect PTC upper cover heaters, avoids on PTC Lid heater and late-class circuit are burned out.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, other attached drawings can also be obtained according to the structure shown in these attached drawings.
Fig. 1 is the high-level schematic functional block diagram that the utility model heat-preservation control circuit is applied in electric heating equipment;
Fig. 2 is the electrical block diagram of one embodiment of heat-preservation control circuit in Fig. 1.
Drawing reference numeral explanation:
Label Title Label Title
10 PTC upper cover heaters R1 First resistor
20 Bottom heater R2 Second resistance
30 Fault detection circuit R3 3rd resistor
40 Bottom heater driving circuit R4 First current-limiting resistance
50 Master controller R5 Second current-limiting resistance
60 Side heater R6 Third current-limiting resistance
70 Temperature sensor D1 Fly-wheel diode
80 Power supply processing circuit D2 Rectifier diode
90 Operate display circuit SCR1 First driving switch
Q1 First switch pipe SCR2 Second driving switch
KC1 Relay AC-L Cathode power supply end
VCC1 First DC power supply AC-N Negative electricity source
C1 First capacitance
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that described embodiment is only the part of the embodiment rather than whole of the utility model Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise Lower all other embodiments obtained, shall fall within the protection scope of the present invention.
If it is to be appreciated that related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding, Afterwards ...), then directionality instruction be only used for explain it is opposite between each component under a certain particular pose (as shown in drawings) Position relationship, motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
It if, should " first ", " the in addition, relate to the description of " first ", " second " etc. in the utility model embodiment Two " etc. description is only used for description purpose, and it is not intended that instruction or implying its relative importance or implicit indicating meaning The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can express or implicitly include at least one A this feature.In addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill Personnel can be implemented as basis, and this technical side is will be understood that when the combination appearance of technical solution is conflicting or can not realize The combination of case is not present, also not within the protection domain of the requires of the utility model.
The utility model proposes electric heating equipment and for a kind of heat-preservation control circuit in electric heating equipment, the electrical heating Equipment can be electric pressure cooking saucepan, electric cooker etc., below for convenience of understanding, be described by taking electric cooker as an example in each embodiment.
It is understood that electric cooker generally includes pot and upper cover, the calandria of electric cooker is generally arranged at pot On the upper lid of bottom, medial surface and electric cooker.Electrothermic wire is usually respectively adopted for side heater and upper cover heater and PTC adds Hot device realizes that Electrothermic wire and ptc heater power are smaller, thus be usually used in keeping the temperature, the fever of bottom-heated body generally use Disk realizes that the power of heat-generating disc is larger, therefore be mainly used for cooking.
Ptc heater power changes automatically, and heating speed is fast, has good help to heat insulation effect, and cost is relatively low.But It is that ptc heater is susceptible to that electric current is excessive, the failures such as short-circuit due to production technology, and ptc heater is usually simultaneously Connection is arranged between the zero of AC power, fiery conducting wire, thus other circuit modules in electric heating equipment is easily caused to be damaged.
Referring to FIG. 1 and FIG. 2, to solve the above-mentioned problems, the utility model proposes a kind of heat-preservation control circuits.In this practicality In a novel embodiment, which is included for the cathode power supply end AC-L of incoming transport power supply and negative electricity source AC-N and PTC upper covers heater 10, bottom heater 20, for detecting whether the PTC upper covers heater 10 short circuit occurs The fault detection circuit 30 of failure, for drive PTC work the first driving switch SCR1, for the bottom to be driven to add Bottom heater driving circuit 40 that hot device 20 works and for controlling the first driving switch SCR1 and bottom heater The master controller 50 that driving circuit 40 works.
Wherein, the first end of the bottom heater 20 is connect with the negative electricity source AC-N, the bottom heater 20 second end respectively with the first end of the PTC upper covers heater 10, the test side of the fault detection circuit 30 and described The output terminal connection of bottom heater driving circuit 40, the of the controlled end of the bottom-heated driving circuit and master controller 50 One control terminal connects;The output terminal of the fault detection circuit 30 is connect with the signal feedback end of the master controller 50;It is described The second end of PTC upper covers heater 10 is connect with the first conduction terminal of the first driving switch SCR1, and first driving is opened The second conduction terminal and the input terminal of the cathode power supply end AC-L and the bottom heater driving circuit 40 for closing SCR1 interconnect, The controlled end of the first driving switch SCR1 is connect with the second control terminal of the master controller 50.
In the present embodiment, master controller 50 can be dsp system, embedded-type ARM microprocessor, and master controller 50 is used to connect Key command input by user is received, and according to key command, controls the first driving switch SCR1 and bottom heater driving circuit 40。
In the present embodiment, control of the bottom heater 20 based on bottom heater driving circuit 40, and receiving bottom It works, and generates heat at a high speed, and then the object in heating electric rice cooker during the drive signal that heater drive circuit 40 exports.
In the present embodiment, control of the PTC upper covers heater 10 based on the first driving switch SCR1, and receiving the first drive It works during the drive signal of dynamic switch SCR1 outputs, to be kept the temperature to the object in electric cooker.
It should be noted that since PTC upper covers heater 10 and bottom heater 20 are arranged in series, and bottom heater 20 The impedance of heat-generating disc be much larger than the impedance of PTC upper covers heater 10, when PTC upper covers heater 10 and bottom heater 20 simultaneously During work, according to series connection voltage divider principle, the voltage at 20 both ends of bottom heater is much smaller than the electricity at 10 both ends of PTC upper covers heater Pressure, therefore the power of bottom heater 20 is much smaller than power when heating during heat preservation.
In the present embodiment, fault detection circuit 30 detects the operating current of PTC upper covers heater 10 in real time, and electric current is examined Survey signal export to master controller 50 so that master controller 50 detect PTC upper covers heater 10 because the reasons such as short circuit and When leading to flow through the electric current of PTC upper covers heater 10 and being more than the predetermined current rotection thresholds of PTC upper covers heater 10, control first Driving switch SCR1 is disconnected, and PTC upper covers heater 10 to be driven to be stopped, so as to protect PTC upper covers heater 10, is avoided PTC upper covers heater 10 is that late-class circuit is burned out.
Specifically, when receiving heating key command input by user, master controller 50 is controlled with default heating time Bottom heater driving circuit 40 works, and so as to which bottom heater 20 be driven to work, and generates heat at a high speed, in heating electric rice cooker Object.Meanwhile master controller 50 controls the first driving switch SCR1 shutdowns, PTC upper covers heater 10 does not work at this time, works as heating When time reaches default heating time, master controller 50 controls bottom heater driving circuit 40 to be stopped, and controls first Driving switch SCR1 is connected, so as to which PTC upper covers heater 10 and bottom heater 20 be driven to work, with to the object in electric cooker It is kept the temperature.Fault detection circuit 30 detects the operating current of PTC upper covers heater 10 in real time, and current detection signal is exported To master controller 50, when detecting that the electric current for flowing through PTC upper covers heater 10 is more than the predetermined current of PTC upper covers heater 10 and protects When protecting threshold value, master controller 50 controls the first driving switch SCR1 to disconnect, PTC upper covers heater 10 to be driven to be stopped, from And PTC upper covers heater 10 is protected, PTC upper covers heater 10 and late-class circuit is avoided to be burned out.
Referring to FIG. 1 and FIG. 2, in a preferred embodiment, the fault detection circuit 30 includes first resistor R1, the second electricity Test side of the first end of resistance R2 and the first capacitance C1, the first resistor R1 for the fault detection circuit 30, described first The second end of resistance R1 is interconnected with the first end of the second resistance R2 and the first end of the first capacitance C1, second electricity It hinders the second end of R2 and the end of the first capacitance C1 is grounded;The common end of the first resistor R1 and the second resistance R2 Output terminal for the fault detection circuit 30.
In the present embodiment, first resistor R1 and second resistance R2 are divided the output to realize current detection signal, root According to voltage divider principle, first resistor R1 and the ratio of second resistance R2 are bigger, and the voltage got on first resistor R1 is also bigger. In this way, it can just be improved by adjusting the resistance value of first resistor R1 and/or second resistance R2 to flowing through on PTC upper covers heater 10 Current signal sensitivity.
Referring to FIG. 1 and FIG. 2, in a preferred embodiment, the bottom heater driving circuit 40 includes first switch pipe Q1,3rd resistor R3 and relay KC1, the relay KC1 include coil, stationary contact and movable contact, the first switch pipe The controlled end of Q1 is connect through the 3rd resistor R3 with the master controller 50, the first conduction terminal of the first switch pipe Q1 with The first end connection of the coil, the second conduction terminal ground connection of the first switch pipe Q1;The second end of the coil and first DC power supply VCC1 connections, the movable contact are the input terminal of the bottom heater driving circuit 40, and the stationary contact is institute State the output terminal of bottom heater driving circuit 40.
In the present embodiment, controls of the first switch pipe Q1 based on master controller 50 is receiving the output of master controller 50 It is opened during discharge control signal, and then relay KC1 powers on actuation, so that bottom heater 20 is connected in parallel to cathode power supply end AC-L With negative electricity source AC-N and work, and at a high speed generate heat, with the object in heating electric rice cooker.
With continued reference to Fig. 2, in above-described embodiment, the first switch pipe Q1 is preferably NPN type triode Q1, the NPN The base stage of type triode is the controlled end of the first switch pipe Q1, and the current collection extremely described first of the NPN type triode is opened Close the first conduction terminal of pipe Q1, the second conduction terminal of the extremely described first switch pipe Q1 of transmitting of the NPN type triode.
In the present embodiment, the base stage of NPN type triode is led in the discharge control signal for receiving the output of master controller 50 Logical, the collector of NPN type triode and the voltage very little at emitter both ends, are equivalent to short circuit at this time so that be attached thereto after Electric appliance KC1 coils one end is grounded, and one terminates direct current and powers on actuation.Certainly in other embodiments, first switch pipe Q1 is also Other switching tubes such as metal-oxide-semiconductor can be used to realize, be not limited herein.
Referring to FIG. 1 and FIG. 2, based on above-described embodiment, the bottom heater driving circuit 40 still further comprises afterflow Diode D1, the cathode of the sustained diode 1 are connect with the first DC power supply VCC1, the sustained diode 1 Anode is interconnected with the first end of the coil and the first end of the first switch pipe Q1.
It should be noted that the coil of relay KC1 after by electric current, can generate induced electromotive force at coil both ends, When the current vanishes, induced electromotive force can generate backward voltage to first switch pipe Q1.In the present embodiment, sustained diode 1 The both ends of coil are connected in parallel on, to discharge the energy stored in relay KC1 coils when relay KC1 is disconnected, so as to avoid The induced electromotive force that coil generates is excessively high and punctures first switch pipe Q1.In the present embodiment, sustained diode 1 is preferably using fast Quick-recovery diode or Schottky diode.
Referring to FIG. 1 and FIG. 2, in a preferred embodiment, the heat-preservation control circuit further includes side heater 60 and Two driving switch SCR2, the first end of the side heater 60 are connect with the negative electricity source AC-N, the side heat The second end of device 60 is connect with the first conduction terminal of the second driving switch SCR2;The second of the second driving switch SCR2 Conduction terminal is connect with the cathode power supply end AC-L;The controlled end of the second driving switch SCR2 and the master controller 50 Third control terminal connects.
In the present embodiment, the second controls of the driving switch SCR2 based on master controller 50, and receiving master controller 50 It is connected during the control signal of output, side heater 60 to be driven to work.Side heater 60 can be in heating in electric cooker It works during state and either works when electric cooker is in keeping warm mode or be operated at the same time heated condition and keeping warm mode, It is not limited herein.
With continued reference to Fig. 1 and Fig. 2, in above-described embodiment, the first driving switch SCR1 and second driving switch SCR2 preferably uses bidirectional triode thyristor, the first conduction terminal of the first driving switch SCR1 and the second driving switch SCR2 The first conduction terminal correspond to the first main electrode of the bidirectional triode thyristor;The first driving switch SCR1 and second driving The second conduction terminal of switch SCR2 corresponds to the second main electrode of the bidirectional triode thyristor;The first driving switch SCR1 and described The controlled end of second driving switch SCR2 corresponds to the gate pole of the bidirectional triode thyristor.
In the present embodiment, control of the bidirectional triode thyristor based on master controller 50, and can realize bidirectional conduction, and receiving To master controller 50 control signal when be connected, side heater 60 and PTC upper covers heater 10 to be driven to work.
With continued reference to Fig. 1 and Fig. 2, in above-described embodiment, the heat-preservation control circuit further include the first current-limiting resistance R4 and Second current-limiting resistance R5, the first current-limiting resistance R4 are arranged in series in the controlled end of the first driving switch SCR1 and described Between second control terminal of master controller 50, the second current-limiting resistance R5 is arranged in series in the second driving switch SCR2's Between controlled end and the third control terminal of the master controller 50.
In the present embodiment, the first current-limiting resistance R4 and the second current-limiting resistance R5 are used to avoid flowing through the electric current of bidirectional triode thyristor It is excessive and burn bidirectional triode thyristor.
Referring to FIG. 1 and FIG. 2, in a preferred embodiment, the heat-preservation control circuit further includes adds for detecting PTC upper covers The temperature sensor 70 of 20 heating temperature of hot device 10 and/or the bottom heater, the temperature sensor 70 are arranged on described On electric heating equipment.
In the present embodiment, temperature sensor 70 is used to detect the heating temperature under electric cooker heated condition and keeping warm mode, And export the temperature signal detected to master controller 50, so that master controller 50 exports corresponding control according to the temperature signal Signal processed.
Referring to FIG. 1 and FIG. 2, in a preferred embodiment, the heat-preservation control circuit is further included in the master control The power supply processing circuit 80 that device 50 processed is powered, the electrode input end and negative input of the power supply processing circuit 80 correspond to respectively It is connect with the cathode power supply end AC-L and negative electricity source AC-N, output terminal and the master control of the power supply processing circuit 80 The power end connection of device 50 processed.
In the present embodiment, power supply processing circuit 80 is used to the alternating current that AC power inputs being converted to direct current electricity output extremely Master controller 50 and other circuit modules, to provide operating voltage for master controller 50 and other circuit modules.
With continued reference to Fig. 1 and Fig. 2, in above-described embodiment, heat-preservation control circuit is further included for being input to power supply processing The AC power of circuit 80 carries out the third current-limiting resistance R6 of current limliting and the rectification for carrying out rectification to the AC power of input The first end of diode D2, third current-limiting resistance R6 are connect with negative electricity source AC-N, the second end of third current-limiting resistance R6 with The anode connection of rectifier diode D2;The cathode of rectifier diode D2 is connect with power supply processing circuit 80.
Referring to FIG. 1 and FIG. 2, in a preferred embodiment, the heat-preservation control circuit further includes and the master controller 50 The operation display circuit 90 of electrical connection.
In the present embodiment, touch display screen may be used to realize in operation display circuit 90, and LED can also be respectively adopted and show Display screen and switch key realize that operation display circuit 90 is used to implement human-computer interaction, user can be by switch key come defeated Enter different function trigger signals, and culinary art situation is understood by display circuit in fact.
The utility model also proposes a kind of electric heating equipment, and the electric heating equipment includes preservation and controlling as described above electricity Road.The detailed construction of the electricity heat-preservation control circuit can refer to above-described embodiment, and details are not described herein again;It is understood that due to Above-mentioned heat-preservation control circuit has been used in the utility model electric heating equipment, therefore, the reality of the utility model electric heating equipment Apply whole technical solutions that example includes above-mentioned heat-preservation control circuit whole embodiments, and the technique effect reached also complete phase Together, details are not described herein.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention, Under every utility model in the utility model is conceived, equivalent structure made based on the specification and figures of the utility model Transformation or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims (10)

1. a kind of heat-preservation control circuit, applied in electric heating equipment, which is characterized in that the heat-preservation control circuit includes being used for The cathode power supply end of incoming transport power supply and negative electricity source and PTC upper covers heater, bottom heater, for detecting State whether PTC upper covers heater the fault detection circuit of short trouble occurs, for driving PTC upper covers heater work First driving switch, for the bottom heater driving circuit that drives bottom heater work and for controlling described the The master controller of one driving switch and bottom heater drive circuit works;Wherein,
The first end of the bottom heater is connect with the negative electricity source, the second end of the bottom heater respectively with institute State the defeated of the first end of PTC upper cover heaters, the test side of the fault detection circuit and the bottom heater driving circuit Outlet connects, and the controlled end of the bottom-heated driving circuit and the first control terminal of master controller connect;The fault detect The output terminal of circuit is connect with the signal feedback end of the master controller;The second end of the PTC upper covers heater and described the The first conduction terminal connection of one driving switch, the second conduction terminal of first driving switch and the cathode power supply end and described The input terminal interconnection of bottom heater driving circuit, the controlled end of first driving switch and the second control of the master controller End connection processed.
2. heat-preservation control circuit as described in claim 1, which is characterized in that the fault detection circuit include first resistor, Second resistance and the first capacitance, the first end of the first resistor are the test side of the fault detection circuit, first electricity The second end of resistance is interconnected with the first end of the second resistance and the first end of first capacitance, and the second of the second resistance End and the end of first capacitance are grounded;The common end of the first resistor and the second resistance is fault detect electricity The output terminal on road.
3. heat-preservation control circuit as described in claim 1, which is characterized in that the bottom heater driving circuit includes first Switching tube, 3rd resistor and relay, the relay include coil, stationary contact and movable contact, the first switch pipe by Control end is connect through the 3rd resistor with the master controller, and the of the first conduction terminal of the first switch pipe and the coil One end connects, the second conduction terminal ground connection of the first switch pipe;The second end of the coil is connect with the first DC power supply, institute The input terminal that movable contact is the bottom heater driving circuit is stated, the stationary contact is the bottom heater driving circuit Output terminal.
4. heat-preservation control circuit as described in any one of claims 1 to 3, which is characterized in that the heat-preservation control circuit also wraps Side heater and the second driving switch are included, the first end of the side heater is connect with the negative electricity source, the side The second end of face heater is connect with the first conduction terminal of second driving switch;Second conducting of second driving switch End is connect with the cathode power supply end;The controlled end of second driving switch connects with the third control terminal of the master controller It connects.
5. heat-preservation control circuit as claimed in claim 4, which is characterized in that first driving switch and/or described second Driving switch is bidirectional triode thyristor, the first conducting of the first conduction terminal of first driving switch and second driving switch First main electrode of the corresponding bidirectional triode thyristor in end;Second conducting of first driving switch and second driving switch Second main electrode of the corresponding bidirectional triode thyristor in end;The controlled end pair of first driving switch and second driving switch Answer the gate pole of the bidirectional triode thyristor.
6. heat-preservation control circuit as claimed in claim 5, which is characterized in that the heat-preservation control circuit further includes the first current limliting Resistance and the second current-limiting resistance, first current-limiting resistance are arranged in series controlled end and the master in first driving switch Between second control terminal of controller, second current-limiting resistance is arranged in series controlled end and institute in second driving switch Between the third control terminal for stating master controller.
7. heat-preservation control circuit as described in claim 1, which is characterized in that the heat-preservation control circuit further includes to detect The temperature sensor of PTC upper covers heater and/or the bottom heater heating temperature, the temperature sensor are arranged on described On electric heating equipment.
8. heat-preservation control circuit as described in claim 1, which is characterized in that the heat-preservation control circuit is further included for institute The power supply processing circuit of master controller power supply is stated, the electrode input end and negative input of the power supply processing circuit correspond to respectively It is connect with the cathode power supply end and negative electricity source, the power supply of the output terminal of the power supply processing circuit and the master controller End connection.
9. heat-preservation control circuit as described in claim 1, which is characterized in that the heat-preservation control circuit further includes and the master The operation display circuit of controller electrical connection.
10. a kind of electric heating equipment, which is characterized in that the electric heating equipment is included as described in claim 1 to 9 any one Heat-preservation control circuit.
CN201721739141.0U 2017-12-12 2017-12-12 Heat-preservation control circuit and electric heating equipment Active CN207491225U (en)

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CN201721739141.0U CN207491225U (en) 2017-12-12 2017-12-12 Heat-preservation control circuit and electric heating equipment

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112021924A (en) * 2020-09-11 2020-12-04 杭州老板电器股份有限公司 Upper cover heating control device and control method and multifunctional steam box

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112021924A (en) * 2020-09-11 2020-12-04 杭州老板电器股份有限公司 Upper cover heating control device and control method and multifunctional steam box
CN112021924B (en) * 2020-09-11 2021-11-23 杭州老板电器股份有限公司 Upper cover heating control device and control method and multifunctional steam box

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