CN208079416U - heating protection circuit and heating device - Google Patents

heating protection circuit and heating device Download PDF

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Publication number
CN208079416U
CN208079416U CN201820396298.6U CN201820396298U CN208079416U CN 208079416 U CN208079416 U CN 208079416U CN 201820396298 U CN201820396298 U CN 201820396298U CN 208079416 U CN208079416 U CN 208079416U
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China
Prior art keywords
heating
movable contact
stationary contact
driving chip
control
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CN201820396298.6U
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Chinese (zh)
Inventor
刘衍名
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Shenzhen H&T Intelligent Control Co Ltd
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Shenzhen H&T Intelligent Control Co Ltd
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Abstract

It includes heating wire that the utility model, which discloses a kind of heating protection circuit and heating device, the heating protection circuit,;Current insurance silk;Driving chip;Temperature sensor is connect with driving chip;First switch module, first switch module include that the first control units, the first movable contact and the first stationary contact, the first control units are connect with driving chip, and the first movable contact and the first stationary contact are series at heating circuit;Second switch module, second switch module include the second control unit, the second movable contact and the second stationary contact, and the second control unit is connect with driving chip, and the circuit where the second movable contact and the second stationary contact is in parallel with heating wire;After driving chip sends the control signal for controlling the first movable contact and the disconnection of the first stationary contact to the first control units, when the constant temperature of temperature sensor detection increases, it sends control signal and controls the second movable contact and the connection of the second stationary contact, with short-circuit heating wire.Technical solutions of the utility model can improve the safety of electric-heating-wire-heating.

Description

Heating protection circuit and heating device
Technical field
The utility model is related to heating device technology area, more particularly to a kind of heating protection circuit and heating device.
Background technology
In the prior art, it is generally all connect by microcontroller and with the microcontroller using the electrical equipment of electrothermal wire heating Control circuit and temperature sensor control the fever of heating wire;Specifically, control circuit includes at least one switch element, it is single Piece machine control switch element is connected to control the fever of heating wire, when temperature sensor detects that the temperature of heating wire is more than pre- If when temperature, microcontroller can control switch element disconnection, to stop the heating of heating wire;But when the switch element damages, It is possible that microcontroller is unable to control the case where switch element disconnects, stop adding at this point, microcontroller is unable to control heating wire Heat, such heating device can cause the safety problems such as fire because of heating wire laser heating.
Utility model content
The main purpose of the utility model is to provide a kind of heating protection circuit, it is intended to improve the safety of electric-heating-wire-heating Property.
To achieve the above object, the heating protection circuit provided by the utility model includes heating wire and current insurance After silk, the heating wire and the series connection of current insurance silk and for connecting to form a heating circuit with a driving power, the heating Protection circuit further include:
Driving chip;
Temperature sensor is connect with the driving chip, and detects the temperature of the heating wire;
First switch module, the first switch module include the first control units, the first movable contact and the first stationary contact, institute It states the first control units to connect with the driving chip, first movable contact and the first stationary contact are series at the heating circuit;
Second switch module, the second switch module include the second control unit, the second movable contact and the second stationary contact, institute The second control unit is stated to connect with the driving chip, the circuit where second movable contact and second stationary contact with it is described Heating wire is in parallel;
The driving chip send for control control signal that first movable contact and the first stationary contact disconnect to After the first control units, the driving chip obtains the temperature of the temperature sensor detection, is increased in the constant temperature When, it sends control signal control second movable contact and is connected to second stationary contact, with the short circuit heating wire.
Preferably, the first switch module include the first relay, first relay include coil, movable contact and Stationary contact;The movable contact is first movable contact, and the stationary contact is first stationary contact;The driving chip is used for Control the voltage at the coil both ends.
Preferably, the first switch module further includes first switching element, the first switching element include control terminal, The control terminal of first conduction terminal and the second conduction terminal, the first switching element is the first control units, the first switch First conduction terminal of element, the second conduction terminal of first switching element and first relay coil series connection after and for One power supply connects to form the first circuit.
Preferably, the second switch module include the second relay, second relay include coil, movable contact and Stationary contact;The movable contact is second movable contact, and the stationary contact is second stationary contact;The driving chip is used for Control the voltage at the coil both ends.
Preferably, the second switch module further includes second switch element, the second switch element include control terminal, The control terminal of first conduction terminal and the second conduction terminal, the second switch element is second control unit, the second switch First conduction terminal of element, the second conduction terminal of second switch element and second relay coil series connection after and for One power supply connects to form second servo loop.
Preferably, the temperature sensor is thermistor, after the thermistor is connected with a divider resistance and is used for It connects to form the 5th circuit with a power supply, one end that the thermistor is connect with the divider resistance connects with the driving chip It connects.
Preferably, the heating protection circuit further includes Thermal Cutoffs, and the Thermal Cutoffs is connected on the heating In circuit.
The utility model also proposes a kind of heating device, including device body and heated protective described in any one of the above embodiments electricity Road, the heating protection circuit are used to carry out heating and heated protective for described device ontology.Preferably, the heating device is Steamer.
Technical solutions of the utility model are connect by the way that the temperature sensor is arranged with the driving chip, first control Portion processed is connect with the driving chip, and first movable contact and the first stationary contact are series at the heating circuit, in this way, described It is dynamic tactile can reasonably to control described first for the temperature for the heating wire that driving chip is detected according to the temperature sensor Point and the first stationary contact be connected to and disconnection, to control of the realization to the electric-heating-wire-heating;It is sent in the driving chip The control signal that the first movable contact and the first stationary contact for controlling the first switch module disconnect is controlled to described first Behind portion, the driving chip obtains the temperature of the temperature sensor detection, when the constant temperature increases, sends control letter Number control second movable contact be connected to second stationary contact, with the short circuit heating wire, you can realization is described first In the case that switch module fails, heating circuit is closed always, and the constant temperature of temperature sensor detection increases, and is opened by second Heating wire described in module short circuit is closed, so that the current insurance silk constitutes circuit with driving power (generally mains supply), is made It is excessive at the electric current for flowing through the current insurance silk and current insurance silk is made to blow, continue to effectively stop the heating wire It heats and leads to occur the safety problems such as fire, improve the safety of electric-heating-wire-heating.
Description of the drawings
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, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module map of one preferred embodiment of the utility model heating protection circuit;
Fig. 2 is the structure chart of one particular preferred embodiment of the utility model heating protection circuit;
Fig. 3 is the structure chart of another particular preferred embodiment of the utility model heating protection circuit.
The utility model aim is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
If it is to be appreciated that directional instruction (such as up, down, left, right, before and after ...) in the utility model embodiment, Then it is only used for explaining relative position relation, motion conditions etc. under a certain particular pose between each component, if this is specific When posture changes, then directionality instruction also correspondingly changes correspondingly.
If in addition, being related to the description of " first ", " second " etc. in the present invention, it is used for description purposes only, and It should not be understood as indicating or implying its relative importance or implicitly indicate the quantity of indicated technical characteristic.It limits as a result, There is the feature of " first ", " second " can explicitly or implicitly include at least one of the features.In addition, between each embodiment Technical solution can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, work as technical side There is conflicting or cannot achieve when and will be understood that the combination of this technical solution is not present in the combination of case, also not in this practicality Within the protection domain of novel requirement.
The utility model embodiment proposes a kind of heating protection circuit.
As shown in Figure 1, the heating protection circuit in the utility model embodiment includes heating wire 11 and current insurance After silk 12, the heating wire 11 and current insurance silk 12 are connected and for being gone here and there with a driving power 13 (zero curve and firewire of alternating current) Connection forms a heating circuit 10, and the heating protection circuit further includes:
Driving chip 20;
Temperature sensor 30 is connect with the driving chip 20, and detects the temperature of the heating wire 11;
First switch module 40, the first switch module 40 include the first control units, the first movable contact and the first stationary contact Point, the first control units are connect with the driving chip 20, and first movable contact and the first stationary contact are series at described add Hot loop 10;
Second switch module 50, the second switch module 50 include the second control unit, the second movable contact and the second stationary contact Point, second control unit are connect with the driving chip 20, returning where second movable contact and second stationary contact Road is in parallel with the heating wire 11;
It is sent in the driving chip 20 for controlling first movable contact in the first switch module 40 and the For the control signal that one stationary contact disconnects to after the first control units, the driving chip 20 obtains the inspection of the temperature sensor 30 The temperature of survey sends control signal and controls second movable contact and second stationary contact when the constant temperature increases Connection, with the short-circuit heating wire 11.
It is connect with the driving chip 20 in the utility model embodiment by the way that the temperature sensor 30 is arranged, described the One control unit is connect with the driving chip 20, and first movable contact and the first stationary contact are series at the heating circuit 10, In this way, the temperature for the heating wire 11 that the driving chip 20 is detected according to the temperature sensor 30, it can be reasonably The connection and disconnection of first movable contact and the first stationary contact are controlled, to realize the control heated to the heating wire 11; First movable contact and the first stationary contact being arranged in the driving chip 20 controls the first switch module 40 simultaneously After disconnection, the driving chip 20 obtains the temperature of the detection of the temperature sensor 30, when the constant temperature increases, sends Control signal controls second movable contact and is connected to second stationary contact, with the short-circuit heating wire 11, you can realize and exist In the case that the first switch module 40 fails, heating circuit is closed always, the constant temperature liter that temperature sensor 30 detects Height, by the 50 short circuit heating wire 11 of second switch module, so that the current insurance silk 12 is constituted back with driving power 13 Road causes the electric current for flowing through the current insurance silk 12 excessive and current insurance silk 12 is made to blow, described in effectively stopping Heating wire 11 continues to heat and lead to occur the safety problems such as fire, improves the safety of the heating of heating wire 11.
In view of relay has the function by vulnerabilities scan forceful electric power, and relay cost is relatively low, therefore in this practicality In novel embodiment, the preferably described first switch module 40 and second switch module 50 respectively include a relay, specific to join Examine following preferred embodiment.
In a preferred embodiment of the utility model, as shown in Fig. 2, it includes first that the first switch module 40, which is arranged, Relay RE1, the first relay RE1 includes coil, movable contact and stationary contact;The movable contact is described first dynamic tactile Point, the stationary contact are first stationary contact;The driving chip 20 is used to control the coil two of the first relay RE1 The voltage at end, to realize the movable contact and stationary contact be connected to and disconnection, to realize the control heated to the heating wire 11 System.
In order to facilitate the voltage at the coil both ends for controlling the first relay RE1, the first switch module 40 is set Further include first switching element Q1, the first switching element Q1 includes control terminal, the first conduction terminal and the second conduction terminal, described The control terminal of first switching element is the first control units, the first conduction terminal, the first switch member of the first switching element After the series connection of the coil of second conduction terminal of part and the first relay RE1 and for connecting to form the first circuit with a power supply, In this way, the driving chip 20 sends control signal can control the first switch to the control terminal of the first switching element First conduction terminal of element is connected to the second conduction terminal of first switching element, and then realizes the conducting in first circuit, It to make the coil both ends form voltage, and then realizes the first movable contact of relay RE1 and being connected to for stationary contact, and then makes The heating circuit 10 is connected to, and realizes the fever of the heating wire 11.Conversely, also can control the first of the first switching element The disconnection of second conduction terminal of conduction terminal and first switching element, realizes the disconnection of the heating circuit 10, stops the electric heating The fever of silk 11.
In another preferred embodiment of the utility model, as shown in Fig. 2, it includes that the second switch module 50, which is arranged, Two relay RE2, the second relay RE2 includes coil, movable contact and stationary contact;The movable contact is described second dynamic tactile Point, the stationary contact are second stationary contact;The driving chip 20 is used to control the coil two of the second relay RE2 The voltage at end, to realize the movable contact and stationary contact be connected to and disconnection, to realize the control to 11 short circuit of the heating wire System makes the current insurance silk 12 constitute circuit with driving power 13, causes to flow through in the case of 11 short circuit of heating wire The electric current of the current insurance silk 12 is excessive and current insurance silk 12 is made to blow, to effectively stop the continuation of the heating wire 11 It heats and leads to occur the safety problems such as fire, improve the safety of the heating of heating wire 11.
In order to facilitate the voltage at the coil both ends for controlling the second relay RE2, the second switch module 50 is set Further include second switch element Q2, the second switch element Q2 includes the second control terminal, the first conduction terminal and the second conduction terminal, The control terminal of the second switch element is second control unit, and the first conduction terminal of the second switch element, second open After the coil of the second conduction terminal and the second relay RE2 of closing element is connected and for connecting to be formed second time with a power supply Road, in this way, the driving chip 20 sends control terminal i.e. controllable described second of the control signal to the second switch element First conduction terminal of switch element is connected to the second conduction terminal of second switch element, and then realizes leading for the second servo loop It is logical, to make the coil both ends form voltage, and then realize the second movable contact of relay RE2 and being connected to for stationary contact, into And realize the short circuit of the heating wire 11.Conversely, also can control the first conduction terminal and first switch of the first switching element The disconnection of one or two conduction terminal of element, realizes the normal work of the heating wire 11.
Wherein, the first switching element Q1 in above-described embodiment and second switch element Q2 play the role of switch, can be with It is triode or field-effect tube, can be also realized by other control circuits.
In the other embodiments of the utility model, referring to Fig. 3, first switch module 40 and second switch mould may also set up Block 50 respectively includes a bidirectional triode thyristor, photoelectrical coupler and switch element, and driving chip provides control signal to switch element, When switching elements conductive, photoelectrical coupler is connected, and then controls bidirectional triode thyristor conducting, the heating protection circuit remainder Operation principle it is similar to the above embodiments, this will not be repeated here.
In another embodiment, as shown in Fig. 2, the coil of the first relay RE1 and the second relay RE2 in order to prevent Other elements are burnt out when power-off, and sustained diode 1, the D2 of the both ends reverse parallel connection of the coil of one and the relay are set.
In another embodiment, as shown in Figures 2 and 3, in order to reduce the cost of the temperature sensor 30, the temperature is set Degree sensor 30 is thermistor, after the thermistor is connected with a divider resistance R1 and is used to connect to form the with a power supply Five circuits, the thermistor are connect with the one end connecting the divider resistance R1 with the driving chip 20.Specifically, the heat Quick resistance is preferably posive temperature coefficient thermistor.Wherein, the resistance that the divider resistance R1 choice accuracies are 1%.
In another embodiment, as shown in Figures 2 and 3, it further includes close to the heating wire 11 that the heating protection circuit, which is arranged, The Thermal Cutoffs 60 of setting, the Thermal Cutoffs 60 are connected in the heating circuit 10, in this way, working as the Temperature protection When the temperature that silk 60 incudes the heating wire 11 is more than the preset temperature of the Thermal Cutoffs 60, which also can It disconnects to disconnect the heating circuit 10.Preferably, be arranged after the Thermal Cutoffs 60 is connected with heating wire 11 with it is described Second movable contact of second switch module 50 and the circuit parallel connection where the second stationary contact.
The utility model also proposes a kind of heating device, including device body and heating protection circuit, heated protective electricity The concrete structure on road is with reference to above-described embodiment, since the heating device uses the technical solution of any of the above-described embodiment, At least all advantageous effects caused by the technical solution with above-described embodiment, this is no longer going to repeat them.Wherein, described to add Thermal protection circuit is used to carry out heating and heated protective for described device ontology.
Preferably, the heating device is steamer.
The preferred embodiment that these are only the utility model embodiment is not intended to limit the patent model of the utility model It encloses, every under the inventive concept of the utility model, 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 (8)

1. a kind of heating protection circuit, which is characterized in that the heating protection circuit includes heating wire and current insurance silk, described After heating wire and the series connection of current insurance silk and for connecting to form a heating circuit with a driving power, the heating protection circuit Further include:
Driving chip;
Temperature sensor is connect with the driving chip, and detects the temperature of the heating wire;
First switch module, the first switch module include the first control units, the first movable contact and the first stationary contact, and described One control unit is connect with the driving chip, and first movable contact and the first stationary contact are series at the heating circuit;
Second switch module, the second switch module include the second control unit, the second movable contact and the second stationary contact, and described the Two control units are connect with the driving chip, the circuit where second movable contact and second stationary contact and the electric heating Silk is in parallel;
The control signal for controlling first movable contact and the disconnection of the first stationary contact is sent to described in the driving chip After the first control units, the driving chip obtains the temperature of the temperature sensor detection, when the constant temperature increases, hair It send control signal to control second movable contact to be connected to second stationary contact, with the short circuit heating wire.
2. heating protection circuit as described in claim 1, which is characterized in that the first switch module includes the first relay Device, first relay include coil, movable contact and stationary contact;The movable contact is first movable contact, the stationary contact Point is first stationary contact;The driving chip is used to control the voltage at the coil both ends.
3. heating protection circuit as claimed in claim 2, which is characterized in that the first switch module further includes first switch Element, the first switching element include control terminal, the first conduction terminal and the second conduction terminal, the control of the first switching element End is the first control units, the first conduction terminal of the first switching element, the second conduction terminal of first switching element and institute It states after the coil series connection of the first relay and for connecting to form the first circuit with a power supply.
4. heating protection circuit as described in claim 1, which is characterized in that the second switch module includes the second relay Device, second relay include coil, movable contact and stationary contact;The movable contact is second movable contact, the stationary contact Point is second stationary contact;The driving chip is used to control the voltage at the coil both ends.
5. heating protection circuit as claimed in claim 4, which is characterized in that the second switch module further includes second switch Element, the second switch element include control terminal, the first conduction terminal and the second conduction terminal, the control of the second switch element End is second control unit, the first conduction terminal of the second switch element, the second conduction terminal of second switch element and institute It states after the coil series connection of the second relay and for connecting to form second servo loop with a power supply.
6. heating protection circuit as described in claim 1, which is characterized in that the temperature sensor is thermistor, described After thermistor is connected with a divider resistance and for connecting to form the 5th circuit with a power supply, the thermistor with described point One end of piezoresistance connection is connect with the driving chip.
7. heating protection circuit as described in claim 1, which is characterized in that the heating protection circuit further includes Temperature protection Silk, the Thermal Cutoffs are connected in the heating circuit.
8. a kind of heating device, including device body, which is characterized in that further include as described in any one of claim 1 to 7 Heating protection circuit, the heating protection circuit are used to carry out heating and heated protective for described device ontology.
CN201820396298.6U 2018-03-22 2018-03-22 heating protection circuit and heating device Active CN208079416U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820396298.6U CN208079416U (en) 2018-03-22 2018-03-22 heating protection circuit and heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820396298.6U CN208079416U (en) 2018-03-22 2018-03-22 heating protection circuit and heating device

Publications (1)

Publication Number Publication Date
CN208079416U true CN208079416U (en) 2018-11-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820396298.6U Active CN208079416U (en) 2018-03-22 2018-03-22 heating protection circuit and heating device

Country Status (1)

Country Link
CN (1) CN208079416U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110219915A (en) * 2019-05-11 2019-09-10 浙江吉利控股集团有限公司 A kind of method and system reducing car braking noise
CN113133138A (en) * 2019-12-31 2021-07-16 广东美的白色家电技术创新中心有限公司 Heating circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110219915A (en) * 2019-05-11 2019-09-10 浙江吉利控股集团有限公司 A kind of method and system reducing car braking noise
CN110219915B (en) * 2019-05-11 2021-04-16 浙江吉利控股集团有限公司 Method and system for reducing vehicle brake noise
CN113133138A (en) * 2019-12-31 2021-07-16 广东美的白色家电技术创新中心有限公司 Heating circuit

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