CN203562756U - Dry burning protection device for electric heater - Google Patents
Dry burning protection device for electric heater Download PDFInfo
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- CN203562756U CN203562756U CN201320756723.5U CN201320756723U CN203562756U CN 203562756 U CN203562756 U CN 203562756U CN 201320756723 U CN201320756723 U CN 201320756723U CN 203562756 U CN203562756 U CN 203562756U
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- heater
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Abstract
The embodiment of the utility model discloses a dry burning protection device for an electric heater. The dry burning protection device comprises a temperature controller, a heating device and a switching device which are successively in series connection with a power supply, and when the temperature of the heating device exceeds an operating temperature of the temperature controller, a circuit break action is generated by the temperature controller. The dry burning protection device also comprises a controller, a zero cross detection circuit and a switch driving circuit, the controller obtains zero-crossing signals of the power supply successively via the zero cross detection circuit and the temperature controller and outputs a control signal according to the zero-crossing signals to enable the switch driving circuit to drive the switching device, so that the circuit is in a conducting state. With the dry burning protection device, the zero cross detection circuit and the controllable switching device are used in the heating circuit, and the heating circuit can be turned off through the switching device when dry burning happens; and the problems that an object to be heated may be burned or scorched during a heating process, or a heating device is put in a high-temperature potential safety hazard state can be effectively solved.
Description
Technical field
The utility model relates to a kind of heater protective apparatus, relates in particular to a kind of electric heater dry combustion method protective device.
Background technology
Electric heating shell operated by rotary motion in currently available technology has anti-dry burning device, it has comprised heater and the thermostat being connected with its surface, thermostat is controlled the work of heater according to the temperature on this heater surface, prevent dry combustion method, and in its course of work, there is certain defect, when thermostat is controlled after heater stop heating, along with distributing of heat, the temperature of heater slowly declines, after protection range lower than thermostat, protractor is communicated with again, make heater repeat to obtain electric heating, it will constantly repeat said process, make boiled water become thousand boiling water, or make burnt even the burning such as its decoction of medicinal ingredients heating form the material that is unfavorable for health, thermostat works long hours in high temperature on off operating mode in addition, its working life shortens greatly, also because working long hours, in the condition of high temperature, there is potential safety hazard in device for simultaneous heating heat coil.
Utility model content
The utility model embodiment technical problem to be solved is, a kind of electric heater dry combustion method protective device is provided.Can prevent that dry combustion method phenomenon from appearring in electric heater.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of electric heater dry combustion method protective device, comprise the thermostat, heater and the switching device that are serially connected in successively on power supply, when the temperature of described heater surpasses the operating temperature of described thermostat, described thermostat produces the action of opening circuit; Also comprise controller, zero cross detection circuit, switch driving circuit, described controller obtains the zero cross signal of described power supply successively by described zero cross detection circuit, thermostat, and makes described switch driving circuit drive described switching device to make circuit in conducting state according to described zero cross signal output control signal.
Further, described switching device is bidirectional triode thyristor.
Further, described switching device is relay.
Further, when described controller obtains less than described zero cross signal, output control signal is controlled the angle of flow or the ON time of described bidirectional triode thyristor, and the temperature of described heater is controlled in the control range of described thermostat.
The utility model embodiment also provides another kind of electric heater dry combustion method protective device, comprise the thermostat, heater and the switching device that are serially connected in successively on power supply, when the temperature of described heater surpasses the operating temperature of described thermostat, described thermostat produces the action of opening circuit; Also comprise controller, zero cross detection circuit, switch driving circuit and dry combustion method testing circuit, described controller directly obtains the zero cross signal of described power supply by described zero cross detection circuit, described controller obtains to such an extent that described power supply passes through after the detection signal of described thermostat, heater by described dry combustion method testing circuit, and output control signal makes described switch driving circuit drive described switching device to make circuit in conducting state.
Further, described switching device is bidirectional triode thyristor.
Further described thermostat, heater are that detachable and described switching device are serially connected on power supply.
Implement the utility model embodiment, there is following beneficial effect: by use zero cross detection circuit and controllable switch device in heater circuit, when dry combustion method phenomenon occurs, by switching device, disconnect heater circuit, can effectively solve in heating process and heating thing can occur by burnt or burn, or make heater under high temperature safe hidden danger state.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the first embodiment of the present utility model;
Fig. 2 is the electrical block diagram of the second embodiment of the present utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment 1:
Electrical block diagram with reference to the present embodiment shown in Fig. 1.
The electric heater dry combustion method protective device of the integral type of the utility model embodiment is being the improvement that existing calorifier circuit carries out; make heater further prevent the appearance of dry combustion method phenomenon; thermostat K1, the heater R1 and the switching device 40 that are serially connected on civil power have been comprised; thermostat K1 is fixedly installed on the bottom of heater R1; when the temperature of heater R1 surpasses the operating temperature of thermostat K1, heater R1 produces to heater circuit the action of opening circuit.
In order to prevent dry combustion method, the utility model embodiment has also comprised controller 10, zero cross detection circuit 20 and switch driving circuit 30, zero cross detection circuit 20 is connected between thermostat K1 and heater R1, for controller 10 transmits the zero cross signal of the normal work of heater R1, when controller 10 obtains zero cross signal, output signal makes switch driving circuit 30 driving switch device 40 conductings, and circuit is normally worked.
When there is dry combustion method phenomenon, heater R1 overtemperature opens circuit thermostat K1 generation, and controller 10 obtains less than zero cross signal, stops output signal switch driving circuit 30 driving switch devices 40 are opened circuit, and circuit quits work, and makes dry combustion method conservation treatment.
Need to describe, switching device 40 can be chosen as bidirectional triode thyristor, also can be relay, is chosen as bidirectional triode thyristor describes at the present embodiment.
When switching device 40 is bidirectional triode thyristor, can control its angle of flow or ON time, the temperature of heater is controlled in the control range of thermostat, prevent dry combustion method.
Switch driving circuit 30 corresponds to circuits for triggering, is connected the output of controller 10 by the base stage series resistor R5 of NPN triode Q2, and the G utmost point that collector electrode connects bidirectional triode thyristor D1 by resistance R 4 forms, as shown in Figure 1.
Zero cross detection circuit 20 has comprised NPN triode Q1, its base stage is connected in the subordinate of thermostat K1 by resistance R 3, to obtain the zero cross signal under thermostat K1 normal condition, collector electrode connects the input of controller 10, and connects DC power supply by pull-up resistor R2.
If thermostat K1 normally closed, controller 10 can obtain through the zero cross signal of thermostat K1 by zero cross detection circuit, makes the normal output triggering signal of controller 10 make bidirectional triode thyristor D1 conducting to switch driving circuit 30, and circuit is normally worked; And when thermostat K1 disconnects under dry-fire condition, controller 10 can't detect zero cross signal, stop exporting control signal, make bidirectional triode thyristor D1 cut-off.
Embodiment 2:
Electrical block diagram with reference to the present embodiment shown in Fig. 2.
In order to make the utility model can be applicable to split type electric heater, in Fig. 2, thermostat K1 and heater R1 form Separated electric heater.
The electric heating dry combustion method protective device of the present embodiment has comprised the Separated electric heater 60 consisting of thermostat K1, electric heater R1, the switching device 40 being serially connected on power supply; wherein thermostat K1 is fixedly installed on the bottom of heater R1; when the temperature of heater R1 surpasses the operating temperature of thermostat K1, heater R1 produces to heater circuit the action of opening circuit.
In order to prevent dry combustion method, the utility model embodiment has also comprised controller 10, zero cross detection circuit 20, switch driving circuit 30 and dry combustion method testing circuit 50, zero cross detection circuit 20 directly connects power supply, for controller 10 transmits the zero cross signal of driving mechanism for switch 30 work, dry combustion method testing circuit 50 is connected between Separated electric heater 60 and switching device 40, to controller 10, transmit the make-and-break signal of Separated electric heater 60, to determine whether dry-fire condition.
When controller 10 obtain by dry combustion method testing circuit 50 obtain during the normal working signal of Separated electric heater 60, output signal makes switch driving circuit 30 driving switch device 40 conductings, and circuit is normally worked.
When there is dry combustion method phenomenon; heater R1 overtemperature opens circuit thermostat K1 generation, and controller 10 obtains the working signal less than Separated electric heater 60, stops output signal switch driving circuit 30 driving switch devices 40 are opened circuit; circuit quits work, and makes dry combustion method conservation treatment.Certainly when being judged as dry-fire condition, can also make controller 10 output sound and light alarms, the utility model is not limited at this.
In the present embodiment, dry combustion method testing circuit 50 is consistent with the circuit theory of zero cross detection circuit 20, and zero cross detection circuit 20 and driving mechanism for switch 30 be with consistent described in embodiment 1, and the present embodiment is not done repeat specification at this.
The utility model effectively stopped thermostat with variations in temperature in kettle break-make repeatedly, cause the heater situation of dry combustion method repeatedly, greatly extended the life-span of electric heater, and greatly reduced potential safety hazard.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (7)
1. an electric heater dry combustion method protective device, is characterized in that, comprises the thermostat, heater and the switching device that are serially connected in successively on power supply, and when the temperature of described heater surpasses the operating temperature of described thermostat, described thermostat produces the action of opening circuit; Also comprise controller, zero cross detection circuit, switch driving circuit, described controller obtains the zero cross signal of described power supply successively by described zero cross detection circuit, thermostat, and makes described switch driving circuit drive described switching device to make circuit in conducting state according to described zero cross signal output control signal.
2. electric heater dry combustion method protective device according to claim 1, is characterized in that, described switching device is bidirectional triode thyristor.
3. electric heater dry combustion method protective device according to claim 1, is characterized in that, described switching device is relay.
4. electric heater dry combustion method protective device according to claim 2; it is characterized in that; when described controller obtains less than described zero cross signal; output control signal is controlled the angle of flow or the ON time of described bidirectional triode thyristor, and the temperature of described heater is controlled in the control range of described thermostat.
5. an electric heater dry combustion method protective device, is characterized in that, comprises the thermostat, heater and the switching device that are serially connected in successively on power supply, and when the temperature of described heater surpasses the operating temperature of described thermostat, described thermostat produces the action of opening circuit; Also comprise controller, zero cross detection circuit, switch driving circuit and dry combustion method testing circuit, described controller directly obtains the zero cross signal of described power supply by described zero cross detection circuit, described controller obtains to such an extent that described power supply passes through after the detection signal of described thermostat, heater by described dry combustion method testing circuit, and output control signal makes described switch driving circuit drive described switching device to make circuit in conducting state.
6. electric heater dry combustion method protective device according to claim 5, is characterized in that, described switching device is bidirectional triode thyristor.
7. according to the electric heater dry combustion method protective device described in claim 5 or 6, it is characterized in that, described thermostat, heater are that detachable and described switching device are serially connected on power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320756723.5U CN203562756U (en) | 2013-11-27 | 2013-11-27 | Dry burning protection device for electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320756723.5U CN203562756U (en) | 2013-11-27 | 2013-11-27 | Dry burning protection device for electric heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203562756U true CN203562756U (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320756723.5U Expired - Fee Related CN203562756U (en) | 2013-11-27 | 2013-11-27 | Dry burning protection device for electric heater |
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| Country | Link |
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| CN (1) | CN203562756U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105559617A (en) * | 2016-02-02 | 2016-05-11 | 广东天际电器股份有限公司 | Dry burning preventing circuit |
| CN106444890A (en) * | 2016-09-08 | 2017-02-22 | 珠海格力电器股份有限公司 | Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method |
| CN111006784A (en) * | 2019-12-21 | 2020-04-14 | 广东天际电器股份有限公司 | Dry burning judgment method applied to PTC heating equipment |
| CN112984773A (en) * | 2021-04-26 | 2021-06-18 | 福建省壹萍日用品制造有限公司 | Water boiler for rice steaming machine |
| CN113238592A (en) * | 2021-05-25 | 2021-08-10 | 立铠精密科技(盐城)有限公司 | Temperature control device and temperature control method |
| CN114498555A (en) * | 2022-02-11 | 2022-05-13 | 北大方正集团有限公司 | Prevent dry combustion method protection circuit |
-
2013
- 2013-11-27 CN CN201320756723.5U patent/CN203562756U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105559617A (en) * | 2016-02-02 | 2016-05-11 | 广东天际电器股份有限公司 | Dry burning preventing circuit |
| CN106444890A (en) * | 2016-09-08 | 2017-02-22 | 珠海格力电器股份有限公司 | Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method |
| CN106444890B (en) * | 2016-09-08 | 2018-12-28 | 珠海格力电器股份有限公司 | Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method |
| CN111006784A (en) * | 2019-12-21 | 2020-04-14 | 广东天际电器股份有限公司 | Dry burning judgment method applied to PTC heating equipment |
| CN111006784B (en) * | 2019-12-21 | 2021-07-13 | 广东天际电器股份有限公司 | Dry burning judgment method applied to PTC heating equipment |
| CN112984773A (en) * | 2021-04-26 | 2021-06-18 | 福建省壹萍日用品制造有限公司 | Water boiler for rice steaming machine |
| CN113238592A (en) * | 2021-05-25 | 2021-08-10 | 立铠精密科技(盐城)有限公司 | Temperature control device and temperature control method |
| CN114498555A (en) * | 2022-02-11 | 2022-05-13 | 北大方正集团有限公司 | Prevent dry combustion method protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140423 Termination date: 20161127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |