CN213521270U - Short circuit detection protection circuit for alternating current heating core - Google Patents
Short circuit detection protection circuit for alternating current heating core Download PDFInfo
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- CN213521270U CN213521270U CN202022222882.XU CN202022222882U CN213521270U CN 213521270 U CN213521270 U CN 213521270U CN 202022222882 U CN202022222882 U CN 202022222882U CN 213521270 U CN213521270 U CN 213521270U
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Abstract
The application relates to an alternating current heating core short circuit detection protection circuit, including heating core, heating device, short circuit detection device and controlling means, short circuit detection device with heating core be coupled, be used for detecting whether short circuit and output detected signal of heating core, controlling means is coupled with short circuit detection device, is used for receiving detected signal and output control signal, heating device is used for receiving control signal with the heating power supply circuit of the switch-on heating core or the heating power supply circuit of the disconnection heating core. This application has the power difference that can avoid receiving the core that generates heat and influences, in time protects to the condition of the core short circuit that generates heat, improves detectivity's effect.
Description
Technical Field
The application relates to the field of short circuit detection protection, in particular to a short circuit detection protection circuit for an alternating current heating core.
Background
At present, electric soldering iron, hot air gun and the like are necessary tools for electronic manufacturing and electric appliance maintenance, and are mainly used for welding elements and leads, heating heat shrinkable tubes and the like. With the development of industry, the use of electric soldering irons and hot air guns is more and more extensive, and the safety performance of the electric soldering irons and the hot air guns is higher.
Electric iron, hot-blast rifle etc. generally adopt alternating current power supply, and its inside core that generates heat can continuously generate heat in the use, need set up the core short-circuit protection circuit that generates heat in order to detect the operating condition of the core that generates heat. The existing short-circuit protection circuit of the heating core usually adopts a current type detection protection circuit, and detects the real-time current of the heating core by arranging a special alternating current detection device so as to judge the working state of the heating core.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: the current detection is easily affected by the power difference of the heating core, so that the detection result generates difference, and the protection circuit malfunctions.
SUMMERY OF THE UTILITY MODEL
In order to avoid receiving the power difference influence of the core that generates heat, in time protect to the condition of the core short circuit that generates heat, improve detectivity, this application provides an alternating current core short circuit that generates heat detects protection circuit.
The application provides a short circuit detection protection circuit of alternating current heating core adopts following technical scheme:
the utility model provides an alternating current heating core short circuit detection protection circuit, includes heating core, heating device, short circuit detection device and controlling means, short circuit detection device is coupled with the heating core, is used for detecting whether the heating core short circuit and output detected signal, controlling means is coupled with short circuit detection device, is used for receiving detected signal and output control signal, heating device is used for receiving control signal with the heating power supply circuit of the switch-on heating core or the heating power supply circuit of the disconnection heating core.
By adopting the technical scheme: whether the heating core is short-circuited can be timely detected through the short-circuit detection device, once the heating core is short-circuited, the short-circuit detection device outputs a detection signal to the control device, the control device outputs a control signal to the heating device after receiving the detection signal, the heating device immediately cuts off the power supply to the heating core, and through the mode, the heating core can be timely protected against the short-circuit condition of the heating core, and the power supply to the heating core is timely cut off.
Optionally, the short circuit detection device includes a rectification driving component and a photoelectric coupling component, the rectification driving component is coupled to the heating device and is configured to receive an ac signal for supplying power to the heating core and output a driving signal, and the photoelectric coupling component is coupled to the rectification driving component and is configured to receive the driving signal output by the rectification driving component and output a detection signal.
By adopting the technical scheme: through mutually supporting of rectification drive assembly and optoelectronic coupling subassembly, when normal during operation, can effectively utilize the alternating current signal to the core power supply that generates heat for rectification drive assembly drive optoelectronic coupling subassembly output periodic square wave signal to this produces with alternating current frequency, the same detected signal of cycle, and to this, the controlling means discernment of being convenient for, and judge that the core that generates heat is in normal operating condition, is difficult for receiving the power difference influence of the core that generates heat simultaneously, has improved detectivity.
Optionally, the optoelectronic coupling assembly includes an optoelectronic coupler U1 and a second resistor R2, an input end of the optoelectronic coupler U1 is coupled to the rectifying driving assembly and configured to receive a driving signal output by the rectifying driving assembly to turn on or off the optoelectronic coupler U, a first output end of the optoelectronic coupler U1 is coupled to the second resistor R2, the other end of the second resistor R2 is coupled to a first power source, and a connection point of the second resistor R2 and the first output end of the optoelectronic coupler U1 is connected to an input end of the control device.
By adopting the technical scheme: when the core both ends short circuit generates heat, the voltage of rectification drive assembly output can be not enough to make optoelectronic coupler U1 switch on, at this moment, the output voltage of first power is whole to be exported on second resistance R2, controlling means's input lasts and receives high level signal, compare controlling means and stabilize received square wave signal before this, then know when continuously receiving high level signal, the core heating that generates heat is unusual, at this moment, the control signal of turning off can break off the heating power supply circuit who generates heat the core through controlling means output. Through this mode, increased the sensitivity of action, also can be more intelligent, the life of extension core that generates heat.
Optionally, the heating device includes a power supply, a first resistor R1, and a switch assembly, where one end of the first resistor R1 is connected to the first output AC-L of the power supply, the other end of the first resistor R1 is coupled to the heating core, the other end of the heating core is coupled to the switch assembly, and the other end of the switch assembly is connected to the second output AC-N of the power supply.
By adopting the technical scheme: first resistance R1 is power resistance, plays the guard action, and when the core simulation short circuit that generates heat, the switching element did not break off this moment, and alternating voltage adds on R1 basically to this avoids short circuit between alternating current live wire, the zero line, improves the security of circuit.
Optionally, the switch assembly includes a heating control switch U2 and a driver, one end of the heating control switch U2 is coupled to the heating core, the other end of the heating control switch U2 is connected to the second output AC-N of the power supply, and the driver is connected to the heating control switch U2 and is configured to receive the control signal and control the heating control switch U2 to turn on or off.
By adopting the technical scheme: the driver receives the control signal and drives the heating control switch U2 to be opened and closed, the driver has the function of isolating clutter signals, the influence of the clutter signals and the like on the heating control switch U2 can be effectively reduced, and the reliability of the action of the heating control switch U2 is improved; the heating control switch U2 adopts bidirectional thyristor, which has fast response, can be switched on and off within microsecond level and operates without contact, and has no spark and noise during switching on and off, and low cost.
Optionally, the control device includes a control component for receiving the detection signal and outputting a control signal, and a power supply component coupled to the control component for supplying power to the control component.
By adopting the technical scheme: the control assembly can stably receive the detection signal and output the control signal, so that the overall structure of the short-circuit protection circuit is simplified, and the production cost is reduced.
Optionally, two ends of the heating core are provided with short circuit test points.
By adopting the technical scheme: after the circuit is assembled, the simulation short circuit debugging can be carried out through the short circuit detection point, so that whether the circuit functions are normal or not is detected, and the reliability of the circuit performance is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
whether the heating core is short-circuited or not can be detected in time through the short-circuit detection device, once the heating core is short-circuited, the short-circuit detection device outputs a detection signal to the control device, the control device outputs a control signal to the heating device after receiving the detection signal, and the heating device immediately cuts off power supply to the heating core;
through the mutual matching of the rectification driving component and the photoelectric coupling component, when the heating core works normally, the alternating current signal for supplying power to the heating core can be effectively utilized, so that the rectification driving component drives the photoelectric coupling component to output a periodic square wave signal, and a detection signal with the same alternating current frequency and period is generated, therefore, the control device can conveniently identify and judge that the heating core is in a normal working state, meanwhile, the influence of the power difference of the heating core is not easily caused, and the detection sensitivity is improved;
when the core both ends short circuit generates heat, the voltage of rectification drive assembly output can be not enough to make optoelectronic coupler U1 switch on, at this moment, the output voltage of first power is whole to be exported on second resistance R2, controlling means's input lasts and receives high level signal, compare controlling means and stabilize received square wave signal before this, then know when continuously receiving high level signal, the core heating that generates heat is unusual, at this moment, the control signal of turning off can break off the heating power supply circuit who generates heat the core through controlling means output. Through this mode, increased the sensitivity of action, also can be more intelligent, the life of extension core that generates heat.
Drawings
Fig. 1 is a schematic circuit diagram in an embodiment of the present application.
Description of reference numerals: 1. a heating device; 11. a driver; 2. a short circuit detection device; 21. a rectifying drive component; 22. a photoelectric coupling assembly; 221. a first power supply; 3. a control device; 31. a control component; 32. a power supply component; 4. short circuit test points; 5. a heating core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses short circuit detection protection circuit of alternating current heating core.
Referring to fig. 1, an ac heating core short circuit detection protection circuit is used for detecting and protecting a heating core 5, and once the heating core 5 is short-circuited, immediately cuts off power supply to the heating core 5, and the ac heating core short circuit detection protection circuit comprises the heating core 5, a heating device 1, a short circuit detection device 2 and a control device 3, wherein the short circuit detection device 2 is coupled to the heating core 5 and is used for detecting whether the heating core 5 is short-circuited and outputting a detection signal, the control device 3 is coupled to the short circuit detection device 2 and is used for receiving the detection signal and outputting a control signal, and the heating device 1 is used for receiving the control signal to turn on a heating power supply loop of the heating core 5 or turn off a heating power supply loop of the.
Referring to fig. 1, the heating apparatus 1 includes a power supply, a first resistor R1, and a switch assembly, wherein one end of the first resistor R1 is connected to a live line output AC-L of the power supply, the other end of the first resistor R1 is coupled to the heating core 5, the other end of the heating core 5 is coupled to the switch assembly, and the other end of the switch assembly is connected to a neutral line output AC-N of the power supply. First resistance R1 is power resistance, plays the guard action, and when the core 5 simulation short circuit that generates heat, the switching element did not break off this moment, and alternating voltage adds on first resistance R1 basically to this avoids short circuit between alternating current live wire, the zero line, improves the security of circuit.
Referring to fig. 1, the switch assembly includes a heating control switch U2 and a driver 11, in this embodiment, the heating control switch U2 employs a triac, which reacts very fast, can be turned on and off within microseconds and operates without contact, and has no spark and noise during on and off, and is low in cost. The heating control switch U2 has a pin 1 coupled to the neutral line AC-N of the power supply, a pin 2 coupled to the heat generating core 5, and a pin 3 coupled to the driver 11. The driver 11 adopts a silicon controlled isolation driver which has the function of isolating clutter signals, and the influence of the clutter signals and the like on the heating control switch U2 can be effectively reduced.
Referring to fig. 1, the short circuit detection device 2 includes a rectifying driving component 21 and a photoelectric coupling component 22, the rectifying driving component 21 is coupled to the heat generating core 5 and configured to receive an ac electrical signal for supplying power to the heat generating core 5 and output a driving signal, and the photoelectric coupling component 22 is coupled to the rectifying driving component 21 and configured to receive the driving signal output by the rectifying driving component 21 and output a detection signal.
Referring to fig. 1, the rectifying driving assembly 21 includes a first diode D1, a second diode D2, a third resistor R3 and a fifth resistor R5, the third resistor R3 and the fifth resistor R5 are connected in series and then connected in parallel to the heat generating core 5, anodes of the first diode D1 and the second diode D2 are respectively connected to two ends of the heat generating core 5, and cathodes of the first diode D1 and the second diode D2 are coupled to the photocoupling assembly 22.
The photoelectric coupling component 22 comprises a photoelectric coupler U1 and a second resistor R2, the model of the photoelectric coupler U1 is PC817, the cathode connection point of a first diode D1 and a second diode D2 is connected to the pin 1 of the photoelectric coupler U1, the pin 2 of the photoelectric coupler U1 is connected to the connection node of the third resistor R3 and the fifth resistor R5, the pin 3 of the photoelectric coupler U1 is grounded, the pin 4 is connected to one end of the second resistor R2, the other end of the second resistor R2 is coupled with a first power supply 221, and the first power supply 221 adopts a 5V direct-current power supply.
Referring to fig. 1, the control device 3 includes a control unit 31 for receiving the detection signal and outputting the control signal, and a power unit 32 for supplying power to the control unit 31, the control unit 31 being provided with the power unit 32. The control assembly 31 is a single chip microcomputer U3 with the model of STC89C52, the power supply assembly is a 5V direct-current power supply, and the power supply assembly 32 is coupled with the control assembly 31. The input IO2 of singlechip U3 connects in 4 feet of photocoupler U1 and second resistance R2's connected node, and singlechip U3's output IO1 is coupled with driver 11 mutually, and singlechip U3 can be stable receive detection signal and output control signal, has simplified short-circuit protection circuit's overall structure, has reduced manufacturing cost.
Referring to fig. 1, in order to facilitate analog short-circuit debugging, short-circuit detection points 4 are disposed at two ends of a heating core 5, and after circuit assembly is completed, analog short-circuit debugging can be performed through the short-circuit detection points 4, so as to detect whether the circuit functions are normal or not, and improve reliability of circuit performance.
The implementation principle of the short-circuit detection protection circuit for the alternating-current heating core is as follows: during normal operation, the heating control switch U2 is turned on, the first diode D1 and the second diode D2 are respectively rectified from positive and negative half cycles of alternating current, and the photoelectric coupler U1 is driven to be turned on in turn. When the photoelectric coupler U1 is turned on, the photoelectric coupler U1 pulls down the voltage of the second resistor R2 connected to the 4-pin of the photoelectric coupler U1, and at this time, the input IO2 of the single chip microcomputer U3 receives a square wave signal with the same alternating current frequency and period.
When the short circuit test point 4 is short circuited or the heating core 5 is short circuited, the alternating current voltage of the power supply is basically output to the first resistor R1, the voltage of the heating core 5 is reduced, and the voltage passing through the first diode D1 and the second diode D2 is insufficient to turn on the photoelectric coupler U1. At this time, the output voltage of the first power supply 221 is all output to the second resistor R2, the input terminal IO2 of the single chip microcomputer U3 continuously receives the high level signal, and it can be known that the heating core 5 is abnormally heated when the high level signal is continuously received by comparing the stably received square wave signal. At this time, the output end IO1 of the single chip microcomputer U3 outputs a turned-off control signal to the driver 11, so that the heating control switch U2 is turned off, power supply to the heating core 5 is stopped, and a protection action is completed. Through this mode, can avoid receiving the power difference influence of the core 5 that generates heat, increase the sensitivity of action, singlechip U3 can be stable receive the detected signal and output control signal simultaneously, has simplified short-circuit protection circuit's overall structure, has reduced manufacturing cost.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (7)
1. The utility model provides an alternating current generates heat core short circuit detection protection circuit, includes core (5) that generates heat, its characterized in that: still include heating device (1), short circuit detection device (2) and controlling means (3), short circuit detection device (2) with generate heat core (5) be coupled, be used for detecting whether short circuit and output detection signal generate heat core (5), controlling means (3) are coupled with short circuit detection device (2), are used for receiving detection signal and output control signal, heating device (1) is used for receiving control signal with the heating power supply circuit of the core (5) that generates heat of switch-on or the heating power supply circuit of the core (5) that generates heat of disconnection.
2. The short-circuit detection protection circuit for the alternating-current heating core according to claim 1, characterized in that: the short circuit detection device (2) comprises a rectifying driving component (21) and a photoelectric coupling component (22), the rectifying driving component (21) is coupled with the heating device (1) and used for receiving an alternating current signal for supplying power to the heating core (5) and outputting a driving signal, and the photoelectric coupling component (22) is coupled with the rectifying driving component (21) and used for receiving the driving signal output by the rectifying driving component (21) and outputting a detection signal.
3. The short-circuit detection protection circuit for the alternating-current heating core according to claim 2, characterized in that: the photoelectric coupling assembly (22) comprises a photoelectric coupler U1 and a second resistor R2, the input end of the photoelectric coupler U1 is coupled with the rectifying driving assembly (21) and used for receiving a driving signal output by the rectifying driving assembly (21) to enable the photoelectric coupler U1 to be switched on and off, the first output end of the photoelectric coupler U1 is coupled with the second resistor R2, the other end of the second resistor R2 is coupled with a first power supply (221), and the connection point of the second resistor R2 and the first output end of the photoelectric coupler U1 is connected with the input end of the control device (3).
4. The short-circuit detection protection circuit for the alternating-current heating core according to claim 1, characterized in that: the heating device (1) comprises a power supply, a first resistor R1 and a switch assembly, wherein one end of the first resistor R1 is connected to a first output end AC-L of the power supply, the other end of the first resistor R1 is coupled with the heating core (5), the other end of the heating core (5) is coupled with the switch assembly, and the other end of the switch assembly is connected to a second output end AC-N of the power supply.
5. The short-circuit detection protection circuit for the alternating-current heating core according to claim 4, characterized in that: the switch assembly comprises a heating control switch U2 and a driver (11), one end of the heating control switch U2 is coupled with the heating core (5), the other end of the heating control switch U2 is connected with a second output end AC-N of the power supply, and the driver (11) is connected with the heating control switch U2 and used for receiving a control signal and controlling the heating control switch U2 to be switched on and off.
6. The short-circuit detection protection circuit for the alternating-current heating core according to claim 1, characterized in that: the control device (3) comprises a control component (31) and a power supply component (32), wherein the control component (31) is used for receiving the detection signal and outputting the control signal, and the power supply component (32) is coupled with the control component (31) and used for supplying power to the control component (31).
7. The short-circuit detection protection circuit for the alternating-current heating core according to claim 1, characterized in that: and short circuit test points (4) are arranged at two ends of the heating core (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022222882.XU CN213521270U (en) | 2020-09-30 | 2020-09-30 | Short circuit detection protection circuit for alternating current heating core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022222882.XU CN213521270U (en) | 2020-09-30 | 2020-09-30 | Short circuit detection protection circuit for alternating current heating core |
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| Publication Number | Publication Date |
|---|---|
| CN213521270U true CN213521270U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022222882.XU Active CN213521270U (en) | 2020-09-30 | 2020-09-30 | Short circuit detection protection circuit for alternating current heating core |
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|---|---|
| CN (1) | CN213521270U (en) |
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- 2020-09-30 CN CN202022222882.XU patent/CN213521270U/en active Active
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