CN207491225U - Heat-preservation control circuit and electric heating equipment - Google Patents
Heat-preservation control circuit and electric heating equipment Download PDFInfo
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- 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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- 238000005485 electric heating Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims description 43
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 2
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- 235000007164 Oryza sativa Nutrition 0.000 description 14
- 235000009566 rice Nutrition 0.000 description 14
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- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 3
- 238000010411 cooking Methods 0.000 description 3
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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
Technical Field
The utility model relates to an electronic circuit technical field, in particular to heat preservation control circuit and electrical heating equipment.
Background
In most electric heating apparatuses such as rice cookers, a bottom heating plate, a side heating element and an upper cover heating element are generally provided, the side heating element and the upper cover heating element are usually used for heat preservation because of low power, and the bottom heating plate is mainly used for cooking rice because of high power. The upper cover heating body is mainly realized by a low-power PTC heater, the power of the PTC heater is automatically changed, the heating speed is high, the heat preservation effect is well assisted, and the cost is low. However, the PTC heater is prone to faults such as excessive current and short circuit due to the production process, and the PTC heater is usually arranged between the zero and hot wires of the ac power supply in parallel, so that other circuit modules in the electric heating device are easily damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a heat preservation control circuit and electrical heating equipment aims at solving among the electrical heating equipment because the easy short circuit of PTC heater leads to PTC heater and rear circuit impaired problem.
In order to achieve the above object, the present invention provides a thermal insulation control circuit, which is applied to an electric heating device, the thermal insulation control circuit includes an anode power source end and a cathode power source end for accessing an ac power source, a PTC upper cover heater, a bottom heater, a fault detection circuit for detecting whether the PTC upper cover heater has a short-circuit fault, a first driving switch for driving the PTC upper cover heater to work, a bottom heater driving circuit for driving the bottom heater to work, and a main controller for controlling the first driving switch and the bottom heater driving circuit to work; wherein,
the first end of the bottom heater is connected with the negative electrode power source end, the second end of the bottom heater is respectively connected with the first end of the PTC upper cover heater, the detection end of the fault detection circuit and the output end of the bottom heater drive circuit, and the controlled end of the bottom heating drive circuit is connected with the first control end of the main controller; the output end of the fault detection circuit is connected with the signal feedback end of the main controller; the second end of the PTC upper cover heater is connected with the first conduction end of the first driving switch, the second conduction end of the first driving switch is connected with the anode power supply end and the input end of the bottom heater driving circuit, and the controlled end of the first driving switch is connected with the second control end of the main controller.
Preferably, the fault detection circuit includes a first resistor, a second resistor and a first capacitor, a first end of the first resistor is a detection end of the fault detection circuit, a second end of the first resistor is interconnected with a first end of the second resistor and a first end of the first capacitor, and a second end of the second resistor and an end of the first capacitor are both grounded; and the common end of the first resistor and the second resistor is the output end of the fault detection circuit.
Preferably, the bottom heater driving circuit includes a first switch tube, a third resistor and a relay, the relay includes a coil, a stationary contact and a movable contact, a controlled end of the first switch tube is connected to the main controller through the third resistor, a first conducting end of the first switch tube is connected to a first end of the coil, and a second conducting end of the first switch tube is grounded; the second end of the coil is connected with a first direct current power supply, the movable contact is the input end of the bottom heater driving circuit, and the fixed contact is the output end of the bottom heater driving circuit.
Preferably, the heat preservation control circuit further comprises a side heater and a second driving switch, a first end of the side heater is connected with the negative electrode power supply end, and a second end of the side heater is connected with a first conducting end of the second driving switch; a second conduction end of the second driving switch is connected with the anode power supply end; and the controlled end of the second driving switch is connected with the third control end of the main controller.
Preferably, the first driving switch and/or the second driving switch are bidirectional thyristors, and a first conducting end of the first driving switch and a first conducting end of the second driving switch correspond to first main electrodes of the bidirectional thyristors; second conducting ends of the first driving switch and the second driving switch correspond to second main electrodes of the bidirectional triode thyristor; the controlled ends of the first driving switch and the second driving switch correspond to the gate poles of the bidirectional controllable silicon.
Preferably, the heat preservation control circuit further includes a first current limiting resistor and a second current limiting resistor, the first current limiting resistor is serially connected between the controlled end of the first driving switch and the second control end of the main controller, and the second current limiting resistor is serially connected between the controlled end of the second driving switch and the third control end of the main controller.
Preferably, the heat preservation control circuit further comprises a temperature sensor for detecting the heating temperature of the PTC upper cover heater and/or the bottom heater, and the temperature sensor is arranged on the electric heating device.
Preferably, the heat preservation control circuit further comprises a power supply processing circuit for supplying power to the main controller, a positive input end and a negative input end of the power supply processing circuit are respectively and correspondingly connected with the positive power supply end and the negative power supply end, and an output end of the power supply processing circuit is connected with the power supply end of the main controller.
Preferably, the heat preservation control circuit further comprises an operation display circuit electrically connected with the main controller.
The utility model also provides an electric heating equipment, electric heating equipment includes the heat preservation control circuit as above, the heat preservation control circuit includes positive power end and negative pole power end that are used for inserting alternating current power supply to and PTC upper cover heater, bottom heater, be used for detecting whether the fault detection circuit of short circuit trouble appears in PTC upper cover heater, be used for driving the first drive switch of PTC upper cover heater work, be used for driving bottom heater drive circuit of bottom heater work and be used for controlling the main control unit of first drive switch and bottom heater drive circuit work; the first end of the bottom heater is connected with the negative electrode power source end, the second end of the bottom heater is respectively connected with the first end of the PTC upper cover heater, the detection end of the fault detection circuit and the output end of the bottom heater drive circuit, and the controlled end of the bottom heating drive circuit is connected with the first control end of the main controller; the output end of the fault detection circuit is connected with the signal feedback end of the main controller; the second end of the PTC upper cover heater is connected with the first conduction end of the first driving switch, the second conduction end of the first driving switch is connected with the anode power supply end and the input end of the bottom heater driving circuit, and the controlled end of the first driving switch is connected with the second control end of the main controller.
The utility model discloses a set up main control unit to when receiving the heating button instruction of user input, with the work of predetermineeing heating time control bottom heater drive circuit, thereby drive bottom heater work, and generate heat at a high speed, with the object in the heating electricity rice cooker. Meanwhile, the main controller controls the first driving switch to be turned off, the PTC upper cover heater does not work at the moment, and when the heating time reaches the preset heating time, the main controller controls the bottom heater driving circuit to stop working and controls the first driving switch to be turned on, so that the PTC upper cover heater and the bottom heater are driven to work, and heat preservation is carried out on objects in the electric cooker. The fault detection circuit detects the working current of the PTC upper cover heater in real time and outputs a current detection signal to the main controller, and when the current flowing through the PTC upper cover heater is detected to be larger than a preset current protection threshold value of the PTC upper cover heater, the main controller controls the first driving switch to be switched off so as to drive the PTC upper cover heater to stop working, so that the PTC upper cover heater is protected, and the PTC upper cover heater and a rear-stage circuit are prevented from being burnt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a functional module of the heat preservation control circuit applied to an electric heating device;
fig. 2 is a schematic circuit diagram of an embodiment of the thermal insulation control circuit in fig. 1.
The reference numbers illustrate:
reference numerals | Name (R) | Reference numerals | Name (R) |
10 | PTC upper cover heater | R1 | A first resistor |
20 | Bottom heater | R2 | Second resistance |
30 | Fault detection circuit | R3 | Third resistance |
40 | Bottom heater drive circuit | R4 | A first current limiting resistor |
50 | Main controller | R5 | Second current limiting resistor |
60 | Side heater | R6 | Third current limiting resistor |
70 | Temperature sensor | D1 | Freewheeling diode |
80 | Power supply processing circuit | D2 | Rectifier diode |
90 | Operation display circuit | SCR1 | First driving switch |
Q1 | First switch tube | SCR2 | Second driving switch |
KC1 | Relay with a movable contact | AC-L | Positive electrode power supply terminal |
VCC1 | First direct current power supply | AC-N | Negative power supply terminal |
C1 | First capacitor |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an electric heating equipment and be arranged in an electric heating equipment heat preservation control circuit, this electric heating equipment can be electric pressure cooker, electric rice cooker etc. and the following is for conveniently understanding, describes with electric rice cooker as the example in each embodiment.
It can be understood that the rice cooker generally comprises a cooker body and an upper cover, and the heating body of the rice cooker is generally arranged at the bottom and the inner side surface of the cooker body and on the upper cover of the rice cooker. The side heating element and the upper cover heating element are generally realized by adopting an electric heating wire and a PTC heater respectively, the electric heating wire and the PTC heater have lower power and are generally used for heat preservation, the bottom heating element is generally realized by adopting a heating plate, and the heating plate has higher power and is mainly used for cooking.
The PTC heater has the advantages of automatic power change, high heating speed, good heat preservation effect and low cost. However, the PTC heater is prone to faults such as excessive current and short circuit due to the production process, and the PTC heater is usually arranged between the zero and hot wires of the ac power supply in parallel, so that other circuit modules in the electric heating device are easily damaged.
Referring to fig. 1 and 2, in order to solve the above problems, the present invention provides a thermal insulation control circuit. In an embodiment of the present invention, the heat preservation control circuit includes a positive power source terminal AC-L and a negative power source terminal AC-N for accessing an AC power source, a PTC upper cover heater 10, a bottom heater 20, a fault detection circuit 30 for detecting whether a short circuit fault occurs in the PTC upper cover heater 10, a drive circuit for driving the PTC working first drive switch SCR1, a drive circuit for driving the bottom heater drive circuit 40 for the bottom heater 20 working, and a main controller 50 for controlling the first drive switch SCR1 and the bottom heater drive circuit 40 working.
Wherein, the first end of the bottom heater 20 is connected to the negative power source AC-N, the second end of the bottom heater 20 is respectively connected to the first end of the PTC upper cover heater 10, the detection end of the fault detection circuit 30 and the output end of the bottom heater driving circuit 40, and the controlled end of the bottom heating driving circuit is connected to the first control end of the main controller 50; the output end of the fault detection circuit 30 is connected with the signal feedback end of the main controller 50; the second end of the PTC upper cover heater 10 is connected to the first conduction end of the first driving switch SCR1, the second conduction end of the first driving switch SCR1 is interconnected with the positive power source AC-L and the input end of the bottom heater driving circuit 40, and the controlled end of the first driving switch SCR1 is connected to the second control end of the main controller 50.
In this embodiment, the main controller 50 may be a DSP system or an embedded ARM microprocessor, and the main controller 50 is configured to receive a key instruction input by a user and control the first driving switch SCR1 and the bottom heater driving circuit 40 according to the key instruction.
In this embodiment, the bottom heater 20 is controlled by the bottom heater driving circuit 40, and operates when receiving a driving signal output from the bottom heater driving circuit 40, and generates heat at a high speed, thereby heating an object in the electric rice cooker.
In this embodiment, the PTC upper cover heater 10 is controlled by the first driving switch SCR1, and operates to keep warm the objects in the rice cooker when receiving the driving signal outputted from the first driving switch SCR 1.
It should be noted that, because the PTC upper cover heater 10 and the bottom heater 20 are arranged in series, and the resistance of the heating plate of the bottom heater 20 is much greater than that of the PTC upper cover heater 10, when the PTC upper cover heater 10 and the bottom heater 20 work simultaneously, the voltage across the bottom heater 20 is much smaller than that across the PTC upper cover heater 10 according to the series voltage dividing principle, so that the power of the bottom heater 20 is much smaller than that during heating when heat preservation is performed.
In this embodiment, the fault detection circuit 30 detects the operating current of the PTC upper cover heater 10 in real time, and outputs a current detection signal to the main controller 50, so that the main controller 50 controls the first driving switch SCR1 to be turned off when detecting that the current flowing through the PTC upper cover heater 10 is greater than the preset current protection threshold of the PTC upper cover heater 10 due to reasons such as a short circuit of the PTC upper cover heater 10, so as to drive the PTC upper cover heater 10 to stop operating, thereby protecting the PTC upper cover heater 10 and preventing the PTC upper cover heater 10, i.e., the rear-stage circuit, from being burned.
Specifically, when receiving a heating key command input by a user, the main controller 50 controls the operation of the bottom heater driving circuit 40 for a preset heating time, thereby driving the bottom heater 20 to operate and generating heat at a high speed to heat an object in the rice cooker. Meanwhile, the main controller 50 controls the first driving switch SCR1 to be turned off, at this time, the PTC upper cover heater 10 does not work, and when the heating time reaches the preset heating time, the main controller 50 controls the bottom heater driving circuit 40 to stop working and controls the first driving switch SCR1 to be turned on, thereby driving the PTC upper cover heater 10 and the bottom heater 20 to work to keep the heat of the objects in the electric cooker. The fault detection circuit 30 detects the working current of the PTC upper cover heater 10 in real time and outputs a current detection signal to the main controller 50, and when it is detected that the current flowing through the PTC upper cover heater 10 is greater than the preset current protection threshold of the PTC upper cover heater 10, the main controller 50 controls the first driving switch SCR1 to be turned off to drive the PTC upper cover heater 10 to stop working, thereby protecting the PTC upper cover heater 10 and preventing the PTC upper cover heater 10 and the rear-stage circuit from being burnt.
Referring to fig. 1 and 2, in a preferred embodiment, the fault detection circuit 30 includes a first resistor R1, a second resistor R2, and a first capacitor C1, a first end of the first resistor R1 is a detection end of the fault detection circuit 30, a second end of the first resistor R1 is interconnected with a first end of the second resistor R2 and a first end of the first capacitor C1, and a second end of the second resistor R2 and a first end of the first capacitor C1 are both grounded; the common terminal of the first resistor R1 and the second resistor R2 is the output terminal of the fault detection circuit 30.
In this embodiment, the first resistor R1 and the second resistor R2 divide the voltage to output the current detection signal, and according to the voltage division principle, the larger the ratio between the first resistor R1 and the second resistor R2 is, the larger the voltage divided across the first resistor R1 is. Thus, sensitivity to a current signal flowing through the PTC lid heater 10 can be improved by adjusting the resistance of the first resistor R1 and/or the second resistor R2.
Referring to fig. 1 and 2, in a preferred embodiment, the bottom heater driving circuit 40 includes a first switch Q1, a third resistor R3 and a relay KC1, the relay KC1 includes a coil, a fixed contact and a movable contact, the controlled terminal of the first switch Q1 is connected to the main controller 50 through the third resistor R3, the first conducting terminal of the first switch Q1 is connected to the first terminal of the coil, and the second conducting terminal of the first switch Q1 is grounded; the second end of the coil is connected to a first dc power supply VCC1, the moving contact is the input terminal of the bottom heater driving circuit 40, and the stationary contact is the output terminal of the bottom heater driving circuit 40.
In this embodiment, the first switch tube Q1 is turned on when receiving the discharge control signal outputted from the main controller 50 based on the control of the main controller 50, and then the relay KC1 is electrically connected to make the bottom heater 20 parallel connected to the positive power source AC-L and the negative power source AC-N to work, and generate heat at high speed to heat the object in the electric rice cooker.
With reference to fig. 2, in the above embodiment, the first switch Q1 is preferably an NPN transistor Q1, a base of the NPN transistor is a controlled terminal of the first switch Q1, a collector of the NPN transistor is a first conducting terminal of the first switch Q1, and an emitter of the NPN transistor is a second conducting terminal of the first switch Q1.
In this embodiment, the base of the NPN transistor is turned on when receiving the discharge control signal output by the main controller 50, and at this time, the voltages at the two ends of the collector and the emitter of the NPN transistor are very small, which is equivalent to a short circuit, so that one end of the coil of the relay KC1 connected thereto is grounded, and the other end is connected to the direct current to be powered on and pulled in. Of course, in other embodiments, the first switch Q1 may also be implemented by other switch transistors such as a MOS transistor, which is not limited herein.
Referring to fig. 1 and 2, based on the above embodiment, the bottom heater driving circuit 40 further includes a freewheeling diode D1, a cathode of the freewheeling diode D1 is connected to the first dc power source VCC1, and an anode of the freewheeling diode D1 is interconnected with the first end of the coil and the first end of the first switching tube Q1.
When a current flows through the coil of the relay KC1, an induced electromotive force is generated across the coil, and when the current disappears, the induced electromotive force generates a reverse voltage to the first switching tube Q1. In the embodiment, the freewheeling diode D1 is connected in parallel to two ends of the coil to release the energy stored in the coil of the relay KC1 when the relay KC1 is turned off, so as to prevent the induced electromotive force generated by the coil from being too high to break down the first switching tube Q1. In this embodiment, the freewheeling diode D1 is preferably a fast recovery diode or a schottky diode.
Referring to fig. 1 and 2, in a preferred embodiment, the keep warm control circuit further includes a side heater 60 and a second driving switch SCR2, a first terminal of the side heater 60 is connected to the negative power source terminal AC-N, and a second terminal of the side heater 60 is connected to a first conducting terminal of the second driving switch SCR 2; a second conduction end of the second driving switch SCR2 is connected with the positive electrode power source end AC-L; the controlled terminal of the second driving switch SCR2 is connected to the third control terminal of the main controller 50.
In this embodiment, the second driving switch SCR2 is controlled by the main controller 50 and is turned on to drive the operation of the side heater 60 when receiving a control signal output from the main controller 50. The side heater 60 may operate when the rice cooker is in a heating state, or may operate when the rice cooker is in a heat preservation state, or may operate in both the heating state and the heat preservation state, which is not limited herein.
With continued reference to fig. 1 and fig. 2, in the above embodiment, it is preferable that the first driving switch SCR1 and the second driving switch SCR2 are triacs, and a first conducting terminal of the first driving switch SCR1 and a first conducting terminal of the second driving switch SCR2 correspond to first main electrodes of the triacs; a second conducting terminal of the first driving switch SCR1 and the second driving switch SCR2 corresponds to a second main electrode of the triac; the controlled ends of the first drive switch SCR1 and the second drive switch SCR2 correspond to the gates of the triacs.
In this embodiment, the triac is controlled by the main controller 50, and may be turned on in both directions, and may be turned on when receiving a control signal from the main controller 50, so as to drive the side heater 60 and the PTC upper cover heater 10 to operate.
With reference to fig. 1 and fig. 2, in the above embodiment, the heat-preservation control circuit further includes a first current-limiting resistor R4 and a second current-limiting resistor R5, the first current-limiting resistor R4 is serially connected between the controlled terminal of the first driving switch SCR1 and the second control terminal of the main controller 50, and the second current-limiting resistor R5 is serially connected between the controlled terminal of the second driving switch SCR2 and the third control terminal of the main controller 50.
In this embodiment, the first current limiting resistor R4 and the second current limiting resistor R5 are used to prevent the triac from being burned out due to an excessive current flowing through the triac.
Referring to fig. 1 and 2, in a preferred embodiment, the insulation control circuit further includes a temperature sensor 70 for detecting a heating temperature of the PTC upper cover heater 10 and/or the bottom heater 20, and the temperature sensor 70 is disposed on the electric heating device.
In this embodiment, the temperature sensor 70 is used for detecting the heating temperature of the electric cooker in the heating state and the heat preservation state, and outputting the detected temperature signal to the main controller 50, so that the main controller 50 outputs a corresponding control signal according to the temperature signal.
Referring to fig. 1 and 2, in a preferred embodiment, the heat preservation control circuit further includes a power processing circuit 80 for supplying power to the main controller 50, a positive input end and a negative input end of the power processing circuit 80 are respectively connected to the positive power source AC-L and the negative power source AC-N, and an output end of the power processing circuit 80 is connected to a power source end of the main controller 50.
In this embodiment, the power processing circuit 80 is configured to convert ac power input by an ac power source into dc power and output the dc power to the main controller 50 and other circuit modules, so as to provide operating voltages for the main controller 50 and other circuit modules.
With continued reference to fig. 1 and 2, in the above embodiment, the insulation control circuit further includes a third current limiting resistor R6 for limiting the current of the AC power input to the power processing circuit 80 and a rectifying diode D2 for rectifying the input AC power, a first end of the third current limiting resistor R6 is connected to the negative power source AC-N, and a second end of the third current limiting resistor R6 is connected to the anode of the rectifying diode D2; the cathode of the rectifier diode D2 is connected to the power supply processing circuit 80.
Referring to fig. 1 and 2, in a preferred embodiment, the heat preservation control circuit further includes an operation display circuit 90 electrically connected to the main controller 50.
In this embodiment, the operation display circuit 90 may be implemented by a touch display screen, or by an LED display screen and a switch button, respectively, and the operation display circuit 90 is used to implement human-computer interaction, so that a user can input different function trigger signals through the switch button and know the cooking condition through the display circuit.
The utility model also provides an electric heating equipment, electric heating equipment includes as above heat preservation control circuit. The detailed structure of the electric heat preservation control circuit can refer to the above embodiment, and is not described herein; it can be understood that, because the utility model discloses used above-mentioned heat preservation control circuit among the electrical heating equipment, consequently, the utility model discloses electrical heating equipment's embodiment includes all technical scheme of the whole embodiments of above-mentioned heat preservation control circuit, and the technical effect who reaches is also identical, no longer gives unnecessary details here.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A heat preservation control circuit is applied to electric heating equipment and is characterized by comprising a positive power supply end and a negative power supply end which are used for being connected with an alternating current power supply, a PTC upper cover heater, a bottom heater, a fault detection circuit which is used for detecting whether the PTC upper cover heater has a short-circuit fault or not, a first driving switch which is used for driving the PTC upper cover heater to work, a bottom heater driving circuit which is used for driving the bottom heater to work and a main controller which is used for controlling the first driving switch and the bottom heater driving circuit to work; wherein,
the first end of the bottom heater is connected with the negative electrode power source end, the second end of the bottom heater is respectively connected with the first end of the PTC upper cover heater, the detection end of the fault detection circuit and the output end of the bottom heater drive circuit, and the controlled end of the bottom heating drive circuit is connected with the first control end of the main controller; the output end of the fault detection circuit is connected with the signal feedback end of the main controller; the second end of the PTC upper cover heater is connected with the first conduction end of the first driving switch, the second conduction end of the first driving switch is connected with the anode power supply end and the input end of the bottom heater driving circuit, and the controlled end of the first driving switch is connected with the second control end of the main controller.
2. The thermal control circuit of claim 1, wherein the fault detection circuit comprises a first resistor, a second resistor, and a first capacitor, wherein a first terminal of the first resistor is a detection terminal of the fault detection circuit, a second terminal of the first resistor is interconnected with a first terminal of the second resistor and a first terminal of the first capacitor, and a second terminal of the second resistor and a terminal of the first capacitor are both grounded; and the common end of the first resistor and the second resistor is the output end of the fault detection circuit.
3. A keep warm control circuit as claimed in claim 1, wherein the bottom heater drive circuit comprises a first switch tube, a third resistor and a relay, the relay comprises a coil, a stationary contact and a movable contact, the controlled end of the first switch tube is connected to the main controller via the third resistor, the first conducting end of the first switch tube is connected to the first end of the coil, and the second conducting end of the first switch tube is grounded; the second end of the coil is connected with a first direct current power supply, the movable contact is the input end of the bottom heater driving circuit, and the fixed contact is the output end of the bottom heater driving circuit.
4. A keep warm control circuit as claimed in any one of claims 1 to 3, characterized in that the keep warm control circuit further comprises a side heater and a second drive switch, a first terminal of the side heater being connected to the negative power supply terminal, a second terminal of the side heater being connected to a first conducting terminal of the second drive switch; a second conduction end of the second driving switch is connected with the anode power supply end; and the controlled end of the second driving switch is connected with the third control end of the main controller.
5. A heat preservation control circuit as claimed in claim 4, wherein the first drive switch and/or the second drive switch is a triac, and the first conducting terminal of the first drive switch and the first conducting terminal of the second drive switch correspond to first main electrodes of the triac; second conducting ends of the first driving switch and the second driving switch correspond to second main electrodes of the bidirectional triode thyristor; the controlled ends of the first driving switch and the second driving switch correspond to the gate poles of the bidirectional controllable silicon.
6. A thermal insulation control circuit according to claim 5, further comprising a first current limiting resistor and a second current limiting resistor, wherein the first current limiting resistor is arranged in series between the controlled terminal of the first drive switch and the second control terminal of the main controller, and the second current limiting resistor is arranged in series between the controlled terminal of the second drive switch and the third control terminal of the main controller.
7. A temperature-keeping control circuit as set forth in claim 1, characterized in that the temperature-keeping control circuit further comprises a temperature sensor for detecting a heating temperature of the PTC upper cover heater and/or the bottom heater, the temperature sensor being provided on the electric heating device.
8. A heat preservation control circuit as claimed in claim 1, further comprising a power processing circuit for supplying power to the main controller, wherein the positive input terminal and the negative input terminal of the power processing circuit are respectively connected to the positive power terminal and the negative power terminal, and the output terminal of the power processing circuit is connected to the power terminal of the main controller.
9. The thermal insulation control circuit of claim 1, further comprising an operation display circuit electrically connected to the main controller.
10. An electric heating apparatus, characterized in that it comprises a keep warm control circuit as claimed in any one of claims 1 to 9.
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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 (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111109806A (en) * | 2020-01-14 | 2020-05-08 | 东莞市芯科智能科技有限公司 | Straight hair curler product and heating control circuit and control method thereof |
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 |
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2017
- 2017-12-12 CN CN201721739141.0U patent/CN207491225U/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111109806A (en) * | 2020-01-14 | 2020-05-08 | 东莞市芯科智能科技有限公司 | Straight hair curler product and heating control circuit and control method thereof |
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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