CN204390075U - Electric heater Drive Protecting Circuit - Google Patents
Electric heater Drive Protecting Circuit Download PDFInfo
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- CN204390075U CN204390075U CN201520073807.8U CN201520073807U CN204390075U CN 204390075 U CN204390075 U CN 204390075U CN 201520073807 U CN201520073807 U CN 201520073807U CN 204390075 U CN204390075 U CN 204390075U
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- switching tube
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- temperature
- control chip
- electric heater
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Abstract
The utility model discloses a kind of electric heater Drive Protecting Circuit, comprise switching tube, for gather switching tube temperature temperature detecting module, for the control chip of output pulse width modulation signal and the driver module for exporting described switching tube after carrying out drive amplification to described pulse-width signal to; Described switching tube has first end, the second end and the control end for controlling first end and the second end connected state; Described control end is connected with the signal output part of described driver module; The output terminal of described temperature detecting module is connected with described control chip, and the temperature detected according to described temperature detecting module for described control chip and preset temperature compensation factor control the duty of described switching tube.The utility model improves the stability of circuit working.
Description
Technical field
The utility model relates to heating control technology field, particularly relates to electric heater Drive Protecting Circuit.
Background technology
As everyone knows, switching tube for controlling heating power on electric heater of the prior art needs to dispel the heat, but damage switching tube because the states such as heat dissipation channel blocking or operating voltage shakiness cause switching tube to dispel the heat bad, affect the stability of circuit working.
Foregoing only understands the technical solution of the utility model for auxiliary, does not represent and admits that foregoing is prior art.
Utility model content
Fundamental purpose of the present utility model is to provide a kind of electric heater Drive Protecting Circuit, is intended to the stability improving circuit working.
To achieve these goals, the utility model provides a kind of electric heater Drive Protecting Circuit, described electric heater Drive Protecting Circuit comprise switching tube, for gather switching tube temperature temperature detecting module, for the control chip of output pulse width modulation signal and the driver module for exporting described switching tube after carrying out drive amplification to described pulse-width signal to;
Described switching tube has first end, the second end and the control end for controlling first end and the second end connected state; Described control end is connected with the signal output part of described driver module;
The output terminal of described temperature detecting module is connected with described control chip, and the temperature detected according to described temperature detecting module for described control chip and preset temperature compensation factor control the duty of described switching tube.
Preferably, described control chip for obtaining the temperature value of described temperature detecting module current detection every preset time period, and carries out the actual temperature value after error correction according to the temperature value of double detection and the temperature value of described temperature compensation factor calculating current detection.
Preferably, described temperature detecting module comprises temperature sensor, the first resistance, the second resistance and the first electric capacity, and one end of described first resistance is connected with the first preset power, and the other end is connected with earth terminal by described temperature sensor; One end of described second resistance is connected to the common port of described first resistance and described temperature sensor, and the other end is connected with earth terminal by the first electric capacity, and the common port of described second resistance and the first electric capacity is connected to the temperature signal collection end of described control chip.
Preferably, described driver module comprises driving integrated chip, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the second electric capacity, the pulse-width signal input end of wherein said driving integrated chip is connected with described control chip by the 3rd resistance, driving voltage input end is connected with the second preset power, and pulse-width signal output terminal is connected with the control end of described switching tube by the 4th resistance; One end of described 5th resistance is connected with described second preset power, and the other end is connected to the common port of described 3rd resistance and described control chip; One end of described 6th resistance is connected with the control end of described switching tube, and the other end is connected with the second end of described switching tube; One end of described second electric capacity is connected with described driving voltage input end, and the other end is connected with earth terminal.
Preferably, described driver module also comprises voltage stabilizing diode, and the anode of described voltage stabilizing diode is connected with the second end of described switching tube, and negative electrode is connected with the control end of described switching tube.
Preferably, described switching tube is insulated gate bipolar transistor, described first end is the collector of described insulated gate bipolar transistor, and described second end is the emitter of described insulated gate bipolar transistor, and described control end is the gate pole of described insulated gate bipolar transistor.
Preferably, described electrothermal driving protection circuit also comprises buzzer circuit, and described buzzer circuit is connected with described control chip.
The electric heater Drive Protecting Circuit that the utility model embodiment provides is by the temperature value of set temperature detection module detector switch pipe; and according to the temperature of detection and the duty of preset temperature compensation factor gauge tap pipe; thus prevent due to switching tube because temperature is too high and burn out, therefore the utility model improves the stability of circuit working.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model electric heater Drive Protecting Circuit one embodiment.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of electric heater Drive Protecting Circuit, with reference to Fig. 1, in one embodiment, this electric heater Drive Protecting Circuit comprise switching tube Q, for gather switching tube Q temperature temperature detecting module 10, for the control chip 20 of output pulse width modulation signal and the driver module 30 for exporting described switching tube Q after carrying out drive amplification to described pulse-width signal to;
Described switching tube Q has first end, the second end and the control end for controlling first end and the second end connected state; Described control end is connected with the signal output part of described driver module 30;
The output terminal of described temperature detecting module 10 is connected with described control chip 20, and the temperature detected according to described temperature detecting module 10 for described control chip 20 and preset temperature compensation factor control the duty of described switching tube Q.
The driving circuit that the present embodiment provides is mainly used in the drived control realizing switching tube Q.Particularly, the structure of above-mentioned switching tube Q can be arranged according to actual needs, in the present embodiment, switching tube Q is preferably insulated gate bipolar transistor (IGBT), above-mentioned first end is the collector of described insulated gate bipolar transistor, described second end is the emitter of described insulated gate bipolar transistor, and described control end is the gate pole of described insulated gate bipolar transistor.
Should be noted that, the mode that the temperature that above-mentioned control chip 20 detects according to described temperature detecting module 10 and preset temperature compensation factor control the duty of described switching tube Q can be arranged according to actual needs, in the present embodiment, preferably, above-mentioned control chip 20 specifically for obtaining the temperature value of described temperature detecting module 10 current detection every the first preset time period, and carries out the actual temperature value after error correction according to the temperature value of double detection and the temperature value of described temperature compensation factor calculating current detection.
Be understandable that, above-mentioned electric heater is electromagnetic heating apparatus, such as, can be the equipment such as electromagnetic oven, electric cooker.In the beginning following period of time of start heating, control chip 20 Fixed Time Interval reads the temperature value of temperature detecting module 10 detection, marks the temperature value X that the temperature value read is current time
nand the temperature value X that reads of moment before
n-1, X
n-2, X
n-3deng.Then according to X
n, X
n-1the actual temperature value Y of current time switching tube is calculated with temperature compensation factor
n.
Particularly, above-mentioned preset temperature compensation factor arranges and can arrange according to actual needs, in the present embodiment, preferably can obtain in the following ways.
The working temperature of a switching tube Q is obtained every the second preset time period, according to the temperature value accounting temperature compensating factor A of double acquisition by said temperature detection module 10.Particularly, this temperature compensation factor A meets:
wherein X
nbe the temperature gathered for n-th time, X
n-1it is the temperature gathered for (n-1)th time.K is a constant, and M is the initial temperature of temperature compensation.It should be noted that this initial temperature is for controlling to carry out the initial temperature of temperature compensation calculating, namely when the temperature detected is greater than this initial temperature, just carrying out temperature compensation calculating.
In the present embodiment, the large I of above-mentioned constant K and initial temperature M is arranged according to actual needs, and preferably, above-mentioned K is 0.2, and above-mentioned M is 50.
It should be noted that above-mentioned compensating factor carried out experiment first by the way and obtains said temperature compensating factor A before electric heater Drive Protecting Circuit carries out temperature protection, under different temperature variation states, corresponding temperature compensation factor is different.When carrying out temperature protection, obtain the temperature value of temperature detecting module 10 detection every the first preset time period, first according to the temperature X of current detection
mwith the temperature X that the last time is detected
m-1carry out mathematic interpolation and obtain temperature compensation factor A corresponding under this temperature variation state, then according to temperature compensation factor A, X
mand X
m-1the temperature obtaining current detection according to following formulae discovery carries out the measured temperature Y after temperature compensation
m: Y
m=X
m-1+ A (X
m-X
m-1).Work as Y
nwhen being greater than preset value, driver module 30 can be output control signals to by control chip 20, thus gauge tap pipe Q turns off, prevent switching tube Q due to temperature too high and damage.Owing to having carried out temperature compensation computing, thus prevent and to cause because thermometric accuracy is lower damaging switching tube Q, therefore the present embodiment can improve the thermometric precision of switching tube, improves the stability of circuit working.
The electric heater Drive Protecting Circuit that the utility model embodiment provides is by the temperature value of set temperature detection module 10 detector switch pipe Q; and according to the temperature of detection and the duty of preset temperature compensation factor gauge tap pipe Q; thus prevent due to switching tube Q because temperature is too high and burn out, therefore the utility model improves the stability of circuit working.
Should be noted that, said temperature detection module 10 comprises temperature sensor RT, the first resistance R1, the second resistance R2 and the first electric capacity C1, one end of described first resistance R1 is connected with the first preset power VCC, and the other end is connected with earth terminal by described temperature sensor RT; One end of described second resistance R2 is connected to the common port of described first resistance R1 and described temperature sensor RT, the other end is connected with earth terminal by the first electric capacity C1, and the common port of described second resistance R2 and the first electric capacity C1 is connected to the temperature signal collection end of described control chip 20.
In the present embodiment, the structure of said temperature sensor RT can be arranged according to actual needs, and preferably, said temperature sensor RT is thermistor.
Above-mentioned driver module 30 comprises driving integrated chip 31, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2, the pulse-width signal input end of wherein said driving integrated chip 31 is connected with described control chip 20 by the 3rd resistance R3, driving voltage input end is connected with the second preset power VDD, and pulse-width signal output terminal is connected with the control end of described switching tube Q by the 4th resistance R4; One end of described 5th resistance R5 is connected with described second preset power VDD, and the other end is connected to the common port of described 3rd resistance R3 and described control chip 20; One end of described 6th resistance R6 is connected with the control end of described switching tube Q, and the other end is connected with second end of described switching tube Q; One end of described second electric capacity C2 is connected with described driving voltage input end, and the other end is connected with earth terminal.
Should be noted that, the voltage swing of above-mentioned first preset power VCC and the second preset power VDD can be arranged according to actual needs, in the present embodiment, preferably, above-mentioned first preset power VCC is the power supply of+5V, and the second preset power VDD is the power supply of+15V.In the present embodiment, the pulse signal of the pulse-width signal input end input of above-mentioned driving integrated chip 31 carries out exporting from pulse-width signal output terminal after drive amplification through the second preset power VDD, and carrying out dividing potential drop by the 4th resistance R4 and the 6th resistance R6, switching tube Q carries out the switching of conducting and off-state according to the voltage swing at the 6th resistance R6 two ends.
Further, based on above-described embodiment, in the present embodiment, switching tube Q is damaged in order to prevent switching tube Q driving voltage too high, preferably, above-mentioned driver module 30 also comprises voltage stabilizing diode D, and the anode of described voltage stabilizing diode D is connected with second end of described switching tube Q, and negative electrode is connected with the control end of described switching tube Q.
Further, based on above-described embodiment, in the present embodiment, above-mentioned electrothermal driving protection circuit also comprises buzzer circuit 40, and described buzzer circuit 40 is connected with described control chip 20.
In the present embodiment, when the temperature value that control chip 20 gets said temperature detection module 10 current detection is greater than preset value (when the temperature of switching tube Q is too high), export and control signal to driver module 30 with while on-off switching tube Q, buzzer circuit 40 can be output control signals to, pipe to control buzzer circuit 40, thus reminding user electric heater exists potential safety hazard, therefore the present embodiment can improve the security that electric heater uses.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. an electric heater Drive Protecting Circuit, it is characterized in that, comprise switching tube, for gather switching tube temperature temperature detecting module, for the control chip of output pulse width modulation signal and the driver module for exporting described switching tube after carrying out drive amplification to described pulse-width signal to;
Described switching tube has first end, the second end and the control end for controlling first end and the second end connected state; Described control end is connected with the signal output part of described driver module;
The output terminal of described temperature detecting module is connected with described control chip, and the temperature detected according to described temperature detecting module for described control chip and preset temperature compensation factor control the duty of described switching tube.
2. electric heater Drive Protecting Circuit as claimed in claim 1; it is characterized in that; described control chip for obtaining the temperature value of described temperature detecting module current detection every preset time period, and carries out the actual temperature value after error correction according to the temperature value of double detection and the temperature value of described temperature compensation factor calculating current detection.
3. electric heater Drive Protecting Circuit as claimed in claim 1, it is characterized in that, described temperature detecting module comprises temperature sensor, the first resistance, the second resistance and the first electric capacity, one end of described first resistance is connected with the first preset power, and the other end is connected with earth terminal by described temperature sensor; One end of described second resistance is connected to the common port of described first resistance and described temperature sensor, and the other end is connected with earth terminal by the first electric capacity, and the common port of described second resistance and the first electric capacity is connected to the temperature signal collection end of described control chip.
4. electric heater Drive Protecting Circuit as claimed in claim 1, it is characterized in that, described driver module comprises driving integrated chip, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the second electric capacity, the pulse-width signal input end of wherein said driving integrated chip is connected with described control chip by the 3rd resistance, driving voltage input end is connected with the second preset power, and pulse-width signal output terminal is connected with the control end of described switching tube by the 4th resistance; One end of described 5th resistance is connected with described second preset power, and the other end is connected to the common port of described 3rd resistance and described control chip; One end of described 6th resistance is connected with the control end of described switching tube, and the other end is connected with the second end of described switching tube; One end of described second electric capacity is connected with described driving voltage input end, and the other end is connected with earth terminal.
5. electric heater Drive Protecting Circuit as claimed in claim 4, it is characterized in that, described driver module also comprises voltage stabilizing diode, and the anode of described voltage stabilizing diode is connected with the second end of described switching tube, and negative electrode is connected with the control end of described switching tube.
6. electric heater Drive Protecting Circuit as claimed in claim 1; it is characterized in that; described switching tube is insulated gate bipolar transistor; described first end is the collector of described insulated gate bipolar transistor; described second end is the emitter of described insulated gate bipolar transistor, and described control end is the gate pole of described insulated gate bipolar transistor.
7. the electrothermal driving protection circuit according to any one of claim 1 to 6, is characterized in that, described electrothermal driving protection circuit also comprises buzzer circuit, and described buzzer circuit is connected with described control chip.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073807.8U CN204390075U (en) | 2015-02-02 | 2015-02-02 | Electric heater Drive Protecting Circuit |
| PCT/CN2015/082969 WO2016123897A1 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic heating control circuit and electromagnetic heating device |
| EP15880852.7A EP3255957B1 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic heating control circuit and electromagnetic heating device |
| JP2017540765A JP6473514B2 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic induction heating control circuit and electromagnetic induction heating equipment |
| KR1020177024696A KR102057136B1 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic heating control circuit and electromagnetic heating device |
| US15/665,044 US10638551B2 (en) | 2015-02-02 | 2017-07-31 | Electromagnetic heating control circuit and electromagnetic heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073807.8U CN204390075U (en) | 2015-02-02 | 2015-02-02 | Electric heater Drive Protecting Circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204390075U true CN204390075U (en) | 2015-06-10 |
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ID=53362778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520073807.8U Active CN204390075U (en) | 2015-02-02 | 2015-02-02 | Electric heater Drive Protecting Circuit |
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| CN (1) | CN204390075U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988489A (en) * | 2015-02-02 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electric heater driving protection circuit |
| CN106136947A (en) * | 2016-06-22 | 2016-11-23 | 北京小焙科技有限公司 | The curve display methods of a kind of temperature and system |
| CN106249775A (en) * | 2016-08-12 | 2016-12-21 | 珠海格力电器股份有限公司 | Temperature control method and system |
| CN108809283A (en) * | 2017-05-02 | 2018-11-13 | 佛山市顺德区美的电热电器制造有限公司 | The Drive Protecting Circuit of electromagnetic heating system and its IGBT |
| CN113608097A (en) * | 2021-08-03 | 2021-11-05 | 深圳市时代速信科技有限公司 | Device performance detection device and system |
-
2015
- 2015-02-02 CN CN201520073807.8U patent/CN204390075U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988489A (en) * | 2015-02-02 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electric heater driving protection circuit |
| CN105988489B (en) * | 2015-02-02 | 2018-06-26 | 佛山市顺德区美的电热电器制造有限公司 | Electric heater Drive Protecting Circuit |
| CN106136947A (en) * | 2016-06-22 | 2016-11-23 | 北京小焙科技有限公司 | The curve display methods of a kind of temperature and system |
| CN106249775A (en) * | 2016-08-12 | 2016-12-21 | 珠海格力电器股份有限公司 | Temperature control method and system |
| CN106249775B (en) * | 2016-08-12 | 2018-07-06 | 珠海格力电器股份有限公司 | Temperature control method and system |
| CN108809283A (en) * | 2017-05-02 | 2018-11-13 | 佛山市顺德区美的电热电器制造有限公司 | The Drive Protecting Circuit of electromagnetic heating system and its IGBT |
| CN113608097A (en) * | 2021-08-03 | 2021-11-05 | 深圳市时代速信科技有限公司 | Device performance detection device and system |
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| C14 | Grant of patent or utility model | ||
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