CN204013449U - The protective circuit that a kind of MCU is abnormal - Google Patents
The protective circuit that a kind of MCU is abnormal Download PDFInfo
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- CN204013449U CN204013449U CN201420493928.3U CN201420493928U CN204013449U CN 204013449 U CN204013449 U CN 204013449U CN 201420493928 U CN201420493928 U CN 201420493928U CN 204013449 U CN204013449 U CN 204013449U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 15
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 230000005669 field effect Effects 0.000 claims description 19
- 238000010304 firing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The protective circuit that MCU is abnormal, comprises that first input end mouth K1 is in series with the anode of resistance R 1, coupling capacitance C1, diode D1, the negative electrode of diode D1 and resistance R 2 successively, the other end access ground wire of resistance R 2; Connected node between described coupling capacitance C1 and diode D1 accesses the negative electrode of a diode D2, the anode access ground wire of diode D2; Between described diode D1 and the connected node between resistance R 2 and ground wire, be parallel with a coupling capacitance C2; The control end of connected node access switch element Q between the negative electrode of diode D1 and resistance R 2, the output access ground wire of switch element Q, the input of switch element Q is connected with the second input port K2.The utility model is by increasing protective circuit in conventional household appliances, makes MCU occur when abnormal that protective circuit disconnects automatically, and high power device is quit work, and improves the security performance of household appliances, protection user's personal safety and safety of property.
Description
Technical field
The utility model belongs to household appliances technical applications, is specifically related to the protective circuit that a kind of MCU is abnormal.
Background technology
Along with scientific and technological development, the improving constantly of living standard, household appliances are popularized and are promoted, and as government in recent years, carry out the policy of adding some points and going to the countryside, and impel the fast development of household electric appliances.Household appliances have brought the while easily also to have potential safety hazard to people's work, life.Simultaneously present a lot of household appliances in the course of the work, because the problems such as MCU program endless loop in household appliances cause some powerful household appliances to cause the potential safety hazards such as fire in continuous firing, affect user's personal safety as well as the property safety.Household appliances such as refrigerator, electric heater, water dispenser from installing with regard to a direct-open job, if MCU occurs abnormal in the fruit course of work, cause household appliances to occur in the course of the work the phenomenon that crashes, and be arranged on high power device in household appliances still in continuous firing, easily there is the excessive danger that causes fire of high power device heating, harm user's property safety.
Therefore, how can provide a kind of can avoiding automatically to close high power device at household appliances after MCU program enters endless loop in the course of the work, the circuit that reduces potential safety hazard becomes enterprise's urgent problem.
Summary of the invention
In view of this, the technical problems to be solved in the utility model is that a kind of cost of manufacture is low, avoids the endless loop of MCU program and causes the abnormal protective circuit of MCU of potential safety hazard.
In order to solve the problems of the technologies described above, the utility model adopts following scheme to realize: the protective circuit that a kind of MCU is abnormal, comprise that first input end mouth K1 is in series with the anode of resistance R 1, coupling capacitance C1, diode D1, the negative electrode of diode D1 and resistance R 2 successively, the other end access ground wire of resistance R 2; Connected node between described coupling capacitance C1 and diode D1 accesses the negative electrode of a diode D2, the anode access ground wire of diode D2; Between described diode D1 and the connected node between resistance R 2 and ground wire, be parallel with a coupling capacitance C2; The control end of connected node access switch element Q between the negative electrode of diode D1 and resistance R 2, the output access ground wire of switch element Q, the input of switch element Q is connected with the second input port K2.
As improvement of the present utility model, described switch element comprises diode, resistance and field effect transistor, connected node between the negative electrode of diode D1 and resistance R 2 accesses a resistance R 3, the grid of the other end access field effect transistor Q1 of resistance R 3, the source electrode access ground wire of field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with the second input port K2; Connected node between the negative electrode of diode and resistance R 2 accesses the negative electrode of a diode D3, the plus earth of diode D3, the drain electrode of the negative electrode access field effect transistor Q1 of diode D4, the anode access ground wire of diode D4.
As further improvement of the utility model, described switch element comprises diode, resistance and triode, connected node between the negative electrode of diode and resistance R 2 accesses a resistance R 3, the base stage of the other end access triode Q2 of resistance R 3, the emitter access ground wire of triode Q2, the collector electrode of triode Q2 is connected with the second input port K2; Connected node between the negative electrode of diode and resistance R 2 accesses the negative electrode of a diode D3, the plus earth of diode D3, the collector electrode of the negative electrode access triode Q2 of diode D4, the anode access ground wire of diode D4.
Compared with prior art; the utility model by increasing protective circuit in conventional household appliances; make MCU occur when abnormal that protective circuit disconnects automatically; high power device is quit work; thereby avoided household appliances when the endless loop of MCU program causes household appliances to occur in the course of the work crashing phenomenon; and high power device continuous firing still; cause the high power device phenomenons such as too high generation fire of generating heat; improve the security performance of household appliances, protection user's personal safety and safety of property.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of embodiment 1 in the utility model.
Fig. 2 is the circuit diagram of embodiment 2 in the utility model.
Embodiment
In order to allow those skilled in the art understand better the technical solution of the utility model, below in conjunction with accompanying drawing, the utility model is further elaborated.
Embodiment 1
As described in Figure 1, the protective circuit that a kind of MCU is abnormal, comprises that first input end mouth K1 is in series with the anode of resistance R 1, coupling capacitance C1, diode D1, the negative electrode of diode D1 and resistance R 2 successively, the other end access ground wire of resistance R 2; Connected node between described coupling capacitance C1 and diode D1 accesses the negative electrode of a diode D2, the anode access ground wire of diode D2; Between described diode D1 and the connected node between resistance R 2 and ground wire, be parallel with a coupling capacitance C2; Connected node between the negative electrode of diode D1 and resistance R 2 accesses a resistance R 3, the grid of the other end access field effect transistor Q1 of resistance R 3, and the source electrode access ground wire of field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with the second input port K2; Connected node between the negative electrode of diode and resistance R 2 accesses the negative electrode of a diode D3, the plus earth of diode D3, the drain electrode of the negative electrode access field effect transistor Q1 of diode D4, the anode access ground wire of diode D4.The field effect transistor Q1 using is enhancement mode N channel field-effect pipe.
During work, two pins of MCU are connected with the second input port K2 and are connected with first input end mouth K1 respectively, and on the control signal basis of the control signal second input port K2 of the high power device of household appliances, as first input end mouth K1 input PWM, by resistance R 1 current limliting, coupling capacitance C1 coupling, pass through again diode D1, diode D2, coupling capacitance C2 rectifying and wave-filtering becomes level and smooth high level, field effect transistor is opened, the current potential earth connection conducting of the second input port K2, high power device is normally worked; When MCU occurs that MCU exports without PWM extremely, the current potential of the second input port K2 is floating empty, and now MCU control signal is without ground wire reference source, and product will quit work, thereby avoids the generation of peril.
Embodiment 2
As shown in Figure 2, the protective circuit that a kind of MCU is abnormal, comprises that first input end mouth K1 is in series with the anode of resistance R 1, coupling capacitance C1, diode D1, the negative electrode of diode D1 and resistance R 2 successively, the other end access ground wire of resistance R 2; Connected node between described coupling capacitance C1 and diode D1 accesses the negative electrode of a diode D2, the anode access ground wire of diode D2; Between described diode D1 and the connected node between resistance R 2 and ground wire, be parallel with a coupling capacitance C2; Connected node between the negative electrode of diode and resistance R 2 accesses a resistance R 3, the base stage of the other end access triode Q2 of resistance R 3, and the emitter access ground wire of triode Q2, the collector electrode of triode Q2 is connected with the second input port K2; Connected node between the negative electrode of diode and resistance R 2 accesses the negative electrode of a diode D3, the plus earth of diode D3, the collector electrode of the negative electrode access triode Q2 of diode D4, the anode access ground wire of diode D4.
During work, two pins of MCU are connected with the second input port K2 and are connected with first input end mouth K1 respectively, and on the control signal basis of the control signal second input port K2 of the high power device of household appliances, as first input end mouth K1 input PWM, by resistance R 1 current limliting, coupling capacitance C1 coupling, pass through again diode D1, diode D2, coupling capacitance C2 rectifying and wave-filtering becomes level and smooth high level, field effect transistor is opened, the current potential earth connection conducting of the second input port K2, high power device is normally worked; When MCU occurs that MCU exports without PWM extremely, the current potential of the second input port K2 is floating empty, and now MCU control signal is without ground wire reference source, and product will quit work, thereby avoids the generation of peril.
On-off element in switch element in above embodiment, except using field effect transistor and triode, can also be used relay to replace, and is not again elaborated.
Above-described embodiment is only wherein specific implementation of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection range of the present utility model.
Claims (3)
1. the abnormal protective circuit of MCU, is characterized in that, comprises that first input end mouth K1 is in series with the anode of resistance R 1, coupling capacitance C1, diode D1, the negative electrode of diode D1 and resistance R 2 successively, the other end access ground wire of resistance R 2; Connected node between described coupling capacitance C1 and diode D1 accesses the negative electrode of a diode D2, the anode access ground wire of diode D2; Between described diode D1 and the connected node between resistance R 2 and ground wire, be parallel with a coupling capacitance C2; The control end of connected node access switch element Q between the negative electrode of diode D1 and resistance R 2, the output access ground wire of switch element Q, the input of switch element Q is connected with the second input port K2.
2. the abnormal protective circuit of MCU according to claim 1, it is characterized in that, described switch element comprises diode, resistance and field effect transistor, connected node between the negative electrode of diode D1 and resistance R 2 accesses a resistance R 3, the grid of the other end access field effect transistor Q1 of resistance R 3, the source electrode access ground wire of field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with the second input port K2; Connected node between the negative electrode of diode and resistance R 2 accesses the negative electrode of a diode D3, the plus earth of diode D3, the drain electrode of the negative electrode access field effect transistor Q1 of diode D4, the anode access ground wire of diode D4.
3. the abnormal protective circuit of MCU according to claim 1, it is characterized in that, described switch element comprises diode, resistance and triode, connected node between the negative electrode of diode and resistance R 2 accesses a resistance R 3, the base stage of the other end access triode Q2 of resistance R 3, the emitter access ground wire of triode Q2, the collector electrode of triode Q2 is connected with the second input port K2; Connected node between the negative electrode of diode and resistance R 2 accesses the negative electrode of a diode D3, the plus earth of diode D3, the collector electrode of the negative electrode access triode Q2 of diode D4, the anode access ground wire of diode D4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420493928.3U CN204013449U (en) | 2014-08-29 | 2014-08-29 | The protective circuit that a kind of MCU is abnormal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420493928.3U CN204013449U (en) | 2014-08-29 | 2014-08-29 | The protective circuit that a kind of MCU is abnormal |
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| Publication Number | Publication Date |
|---|---|
| CN204013449U true CN204013449U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420493928.3U Expired - Lifetime CN204013449U (en) | 2014-08-29 | 2014-08-29 | The protective circuit that a kind of MCU is abnormal |
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| CN (1) | CN204013449U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326690A (en) * | 2021-12-27 | 2022-04-12 | 容大合众(厦门)科技集团股份公司 | Protection control method based on abnormal heating of heating object |
-
2014
- 2014-08-29 CN CN201420493928.3U patent/CN204013449U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326690A (en) * | 2021-12-27 | 2022-04-12 | 容大合众(厦门)科技集团股份公司 | Protection control method based on abnormal heating of heating object |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141210 |