CN207150151U - 3D printer heating head protection circuit - Google Patents
3D printer heating head protection circuit Download PDFInfo
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- CN207150151U CN207150151U CN201720954978.0U CN201720954978U CN207150151U CN 207150151 U CN207150151 U CN 207150151U CN 201720954978 U CN201720954978 U CN 201720954978U CN 207150151 U CN207150151 U CN 207150151U
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- heating head
- comparator
- hysteresis comparator
- protection circuit
- relay
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Abstract
The utility model discloses a kind of 3D printer heating head protection circuit; including heating head circuit; the heating head circuit is connected with relay; wherein; the control terminal of the relay is connected with hysteresis comparator; the output end of the hysteresis comparator connects a feedback resistance with positive input, and when hysteresis comparator positive input voltage is more than default reverse terminal voltage, the hysteresis comparator output low level disconnects relay；The feedback resistance is thermistor.3D printer heating head protection circuit provided by the utility model; the monitoring to heating head temperature is realized by hysteresis comparator and feedback resistance; evade and caused adverse consequences in the case of software crash, greatly improved the safety and reliability of 3D printer heating head protection circuit.
Description
Technical field
It the utility model is related to a kind of heating head protection circuit, more particularly to a kind of 3D printer heating head protection circuit.
Background technology
3D printer heating head in the market is general only to be overheated by software detection temperature change to provide heating head
There is certain potential safety hazard in protection, the method, in the case where MCU crashes, software can not supervise in real time to heating head temperature change
Control, heating head can be heated constantly, may damage heating head, or produce potential safety hazard.
In order to overcome heating head continuous heating problems in the case of MCU deadlocks, it is necessary to provide a kind of hardware detection heating
Head temperature, and the circuit of heater circuit power supply is cut off under overheat condition, necessarily powered off from heating head is ensured under overheat condition.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of 3D printer heating head protection circuit, can realize
Monitoring to heating head temperature, evade and caused adverse consequences in the case of software crash, greatly improved 3D printer heating head guarantor
The safety and reliability of protection circuit.
The utility model is to provide a kind of 3D printer heating head to solve the technical scheme that above-mentioned technical problem uses
Protection circuit, including heating head circuit, the heating head circuit are connected with relay, wherein, the control terminal of the relay and
Hysteresis comparator is connected, and the output end of the hysteresis comparator connects a feedback resistance with positive input, when sluggishness compares
When device positive input voltage is more than default reverse terminal voltage, the hysteresis comparator output low level disconnects relay.
Above-mentioned 3D printer heating head protection circuit, wherein, the feedback resistance is thermistor R440, the sluggishness
Comparator is twin voltage comparator LM393D, and the positive input of the twin voltage comparator LM393D passes through divider resistance R441
It is connected with temperature collection circuit, and is grounded by filter capacitor C431, the inverse output terminal of the twin voltage comparator LM393D
It is connected by divider resistance R461, divider resistance R421 and 5V power supplys and the threshold voltage of comparator is set, and passes through filter capacitor
C434 is grounded, and the output end of the twin voltage comparator LM393D passes through divider resistance R439 connection 5V power supplys.
The utility model contrast prior art has following beneficial effect：3D printer heating head provided by the utility model
Protection circuit, the monitoring to heating head temperature is realized by hysteresis comparator and feedback resistance, in the case of having evaded software crash
Adverse consequences is caused, greatly improves the safety and reliability of 3D printer heating head protection circuit.
Brief description of the drawings
Fig. 1 is the utility model 3D printer heating head protection circuit block diagram；
Fig. 2 is block diagram in the utility model 3D printer heating head protection circuit.
Fig. 3 is the relay and heating part circuit diagram of the utility model 3D printer heating head.
Embodiment
The utility model will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the utility model 3D printer heating head protection circuit block diagram.
Fig. 1,3D printer heating head protection circuit provided by the utility model, including heating head circuit 1 are referred to, it is described
Heating head circuit 1 is connected with relay 2, wherein, the control terminal of the relay 2 is connected with hysteresis comparator 3, the sluggish ratio
Output end compared with device 3 connects a feedback resistance with positive input, is preset when the positive input voltage of hysteresis comparator 3 is more than
Reverse terminal voltage when, the hysteresis comparator 3 exports low level and disconnects relay 2.
3D printer heating head protection circuit provided by the utility model, wherein, the feedback resistance is thermistor
R440；The monitoring to heating head temperature is realized, is evaded using thermistor, hysteresis comparator, relay, pure hardware circuit
Adverse consequences is caused in the case of software crash.The hysteresis comparator 3 is twin voltage comparator LM393D, and the twin voltage compares
Device LM393D positive input is connected by divider resistance R441 with temperature collection circuit, and is connect by filter capacitor C431
Ground, the inverse output terminal of the twin voltage comparator LM393D pass through divider resistance R461, divider resistance R421 and 5V power supply phase
The threshold voltage for putting comparator is connected with, and is grounded by filter capacitor C434, the output end of the twin voltage comparator LM393D
Pass through divider resistance R439 connection 5V power supplys.Hysteresis comparator circuit is as shown in Fig. 2 relay and heating part circuit such as Fig. 3
It is shown.It is 1.857V that R421 in Fig. 2, R451, which set the threshold voltage of comparator,.Positive input voltage is higher than 1.857V, compares
Device exports high level, and positive input voltage is overturn less than 1.857V level.Because positive input accesses feedback resistance R440,
So positive input voltage and being not equal to temperature sensor input voltage.It is positive defeated when comparator exports high level
It is really that temperature sensor input voltage and 5V pass through R439, R440 and R441 partial pressures to enter terminal voltage.Because 5V is higher than temperature
Degree sensor actually enters voltage, so the voltage of forward end can be slightly above the voltage of temperature sensor input.This is in temperature
The result that heating is opened in delay can be produced when decline.When comparator output is low level, the electricity of positive input
Pressure is actually to pass through resistance R440 and R441 partial pressure between temperature sensor input voltage and 0V.Because 0V is less than temperature biography
Sensor input voltage, so positive input voltage can be less than temperature sensor input voltage, so can produce when temperature raises
When be slightly delayed to turn off heating, prevent temperature jump from causing to judge by accident.
3D printer heating head protection circuit provided by the utility model, using feedback resistance as temperature sensor, lead to
Cross hysteresis comparator 3 to compare it in real time, after certain temperature, the upset of the output level of hysteresis comparator 3, disconnect to adding
The relay 2 that hot head circuit 1 is powered, realize and stop heating.When heating head temperature drops within safe range, sluggishness is relatively
The level of device 3 is overturn again.So as to drive the adhesive of relay 2, continue to power to heating head, heating head can proceed with one's work.This reality
Hardware circuit is fully relied on new, so as to evade the potential safety hazard that may occur in the case of software failure.
The utility model adds a feedback resistance R440 in comparator U11A output ends and comparator positive input, when
Positive input voltage is slowly increased, and increases to micro- when be more than reverse input end, because output is in low level, is passed through
The effect of feedback resistance, input level is dragged down, therefore output end can still be in low level state.When positive input electricity
Pressure, continues to increase, then can realize that positive level is higher than reverse level, output end deflects, and control relay 2 disconnects.With
This can realize delay protection, set heating head overtemperature as 220 DEG C, then by stopping after 239 DEG C of circuit realiration heating head
Heating.After heating head stops heating, heating head temperature is begun to decline, and positive input voltage is begun to decline.Work as positive input
When voltage drops to slightly below reverse input end, because comparator exports high level, acted on, drawn high by feedback resistance
Positive input voltage, so to wait heating head temperature to continue to drop to safe temperature, the sufficiently low ability of positive input level
Output level can be overturn, when heating head temperature drops to 200 DEG C, level deflects, and inhales relay 2 with this
Close, so as to control heating head to continue to heat.
Although the utility model is disclosed as above with preferred embodiment, so it is not limited to the utility model, any
Those skilled in the art, do not departing from spirit and scope of the present utility model, when a little modification and perfect, therefore this can be made
The protection domain of utility model is worked as to be defined by what claims were defined.
Claims (2)
1. a kind of 3D printer heating head protection circuit, including heating head circuit (1), the heating head circuit (1) and relay
(2) it is connected, it is characterised in that the control terminal of the relay (2) is connected with hysteresis comparator (3), the hysteresis comparator (3)
Output end a feedback resistance is connected with positive input, when hysteresis comparator (3) positive input voltage be more than it is default
During reverse terminal voltage, hysteresis comparator (3) the output low level disconnects relay (2).
2. 3D printer heating head protection circuit as claimed in claim 1, it is characterised in that the feedback resistance is temperature-sensitive electricity
R440 is hindered, the hysteresis comparator (3) is twin voltage comparator LM393D, the twin voltage comparator LM393D positive input
End is connected by divider resistance R441 with temperature collection circuit, and is grounded by filter capacitor C431, the twin voltage comparator
LM393D inverse output terminal is connected by divider resistance R461, divider resistance R421 and 5V power supplys sets the thresholding electricity of comparator
Pressure, and be grounded by filter capacitor C434, the output end of the twin voltage comparator LM393D is connected by divider resistance R439
5V power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720954978.0U CN207150151U (en) | 2017-08-02 | 2017-08-02 | 3D printer heating head protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720954978.0U CN207150151U (en) | 2017-08-02 | 2017-08-02 | 3D printer heating head protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207150151U true CN207150151U (en) | 2018-03-27 |
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ID=61674252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720954978.0U Active CN207150151U (en) | 2017-08-02 | 2017-08-02 | 3D printer heating head protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN207150151U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111805058A (en) * | 2020-05-05 | 2020-10-23 | 江苏军智增材航空科技有限公司 | Special welding machine system for arc method metal rapid forming and control method thereof |
| CN111830424A (en) * | 2019-03-29 | 2020-10-27 | 捷拓科技股份有限公司 | Load state detection device |
-
2017
- 2017-08-02 CN CN201720954978.0U patent/CN207150151U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111830424A (en) * | 2019-03-29 | 2020-10-27 | 捷拓科技股份有限公司 | Load state detection device |
| CN111805058A (en) * | 2020-05-05 | 2020-10-23 | 江苏军智增材航空科技有限公司 | Special welding machine system for arc method metal rapid forming and control method thereof |
| CN111805058B (en) * | 2020-05-05 | 2023-12-22 | 江苏军智增材航空科技有限公司 | Special welding machine system for rapid metal forming by arc method and control method thereof |
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