CN208767775U - A kind of runaway electric circuit protection circuit and electronic device - Google Patents
A kind of runaway electric circuit protection circuit and electronic device Download PDFInfo
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- CN208767775U CN208767775U CN201821122490.2U CN201821122490U CN208767775U CN 208767775 U CN208767775 U CN 208767775U CN 201821122490 U CN201821122490 U CN 201821122490U CN 208767775 U CN208767775 U CN 208767775U
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Abstract
The utility model discloses a kind of runaway electric circuit protection circuit and electronic device, runaway electric circuit protection circuit includes monitoring modular, controller and protective module, and protective module is used for and power supply, connected in series with the load；Monitoring modular, controller, protective module are sequentially connected, and monitoring modular is used to send abnormal signal to controller in runaway electric circuit, and the power supply that protective module is cut off the power to load is controlled when controller gets abnormal signal.Abnormal signal is sent to controller in runaway electric circuit by monitoring modular, the power supply that protective module is cut off the power to load is controlled when controller gets abnormal signal；Realize the element persistently overheating even sustained combustion for preventing from being powered on circuit, the power supply that can quickly cut off the power to load, to avoid the risk of sustained combustion.
Description
Technical field
The utility model relates to electronic technology more particularly to a kind of runaway electric circuit protection circuits and electronic device.
Background technique
Some powerful power circuits, when element damages suddenly, element short or excessive by electric current can cause temperature
Degree increases, serious or even can cause to catch fire.Such as ceramic multilayer circuit MLCC can draw when capacitor is influenced deformation by external force
Capacitor internal short-circuit is played, temperature increases, if source current is sufficiently large, can also cause to catch fire；In another example the power of circuit
MOSFET element is easy to carry out short-circuit risks because of control abnormal belt, causes to overheat or catch fire.
Existing electronic equipment temperature it is excessively high or kindling when, can not usually cut off the power, circuit can only be waited to burn completely
It is disconnected, cause serious safety problem.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of runaway electric circuit protection circuit and
Electronic device, can solve existing electronic equipment temperature it is excessively high or kindling when, can not usually cut off the power, electricity can only be waited
The problem of road is blown completely.
The purpose of this utility model adopts the following technical scheme that realization:
A kind of runaway electric circuit protects circuit, including monitoring modular, controller and protective module, the protective module be used for
Power supply, connected in series with the load；
The monitoring modular, controller, protective module are sequentially connected, and the monitoring modular is used in runaway electric circuit to institute
It states controller and sends abnormal signal, the controller controls the protective module and cuts off the power to load when getting abnormal signal
Power supply.
Further, the monitoring modular includes high temperature monitoring unit, the high temperature monitoring unit include the first electric bridge and
First processor；
First electric bridge includes NTC resistance NTC1, resistance R1, resistance R2, resistance R5, the resistance R1 and resistance R2
The points of common connection that points of common connection forms input terminal A1, the NTC resistance NTC1 and resistance R5 forms input terminal B1, described
The points of common connection of NTC resistance NTC1 and resistance R1 form output end C1, the commonly connected dot of the resistance R2 and resistance R5
At output end D1；A voltage is connected between the input terminal A1 and input terminal B1, the output end C1 and output end D1 are connected to
The first processor；
The resistance value of the resistance R5 is within the scope of 2k Ω -10k Ω, and the resistance value of the NTC resistance NTC1 is less than the electricity
When hindering the resistance value of R5, the first processor sends high temperature signal to the controller.
Further, the first processor includes comparator U2, and the normal phase input end of the comparator U2 is connected to institute
Output end D1 is stated, the inverting input terminal of the comparator U2 is connected to the output end C1.
Further, the monitoring modular include fusing monitoring unit, the fusing monitoring unit include the second electric bridge with
Second processor；
Second electric bridge includes NTC resistance NTC2, resistance R3, resistance R4, resistance R6, the resistance R3 and resistance R4
The points of common connection that points of common connection forms input terminal A2, the NTC resistance NTC2 and resistance R6 forms input terminal B2, the electricity
The points of common connection that the points of common connection of resistance R3 and resistance R6 forms output end C2, the resistance R4 and NTC resistance NTC2 is formed
Output end D2；A voltage is connected between the input terminal A2 and input terminal B2, the output end C2 and output end D2 are connected to institute
State second processor；
The resistance value of the resistance R6 is within the scope of 500k Ω -1000k Ω, and the resistance value of the NTC resistance NTC2 is greater than institute
When stating the resistance value of resistance R6, the second processor sends fuse signals to the controller.
Further, the second processor includes comparator U3, and the normal phase input end of the comparator U3 is connected to institute
Output end D2 is stated, the inverting input terminal of the comparator U3 is connected to the output end C2.
Further, the protective module includes controlled end, first end and second end, and the controlled end is connected to the control
Device processed, the controller control the first end and second end by the controlled end and disconnect；
Power supply is connected to load, and load is connected to the first end, and the second end is connected to low level；Or
Power supply is connected to the first end, and load is connected to the second end.
Further, the runaway electric circuit protection circuit further includes alarm module, and the alarm module is connected to the control
Device processed.
Further, the monitoring modular includes multiple high temperature monitoring units and multiple fusing monitoring unit.
A kind of electronic device, including above-mentioned runaway electric circuit protection circuit and power supply and load.
Further, the power supply includes voltage stabilizing chip or voltage conversion chip.
Compared with prior art, the beneficial effect of the utility model embodiment is: through monitoring modular in runaway electric circuit
Abnormal signal is sent to controller, the power supply that protective module is cut off the power to load is controlled when controller gets abnormal signal；
Realize the element persistently overheating even sustained combustion for preventing from being powered on circuit, the power supply that can quickly cut off the power to load, to keep away
Exempt from the risk of sustained combustion.
Detailed description of the invention
Fig. 1 is the circuit diagram that runaway electric circuit provided by the embodiment of the utility model protects circuit；
Fig. 2 for be the first electric bridge for the power supply in Fig. 1, the second electric bridge provides the schematic diagram of voltage.
In figure: 100, monitoring modular；110, high temperature monitoring unit；111, the first electric bridge；112, first processor；120, it melts
Disconnected monitoring unit；121, the second electric bridge；122, second processor；MCU, controller；200, protective module；10, power supply；20, it bears
It carries.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
If Fig. 1 is the circuit diagram that runaway electric circuit protects circuit.
Runaway electric circuit protection circuit includes monitoring modular 100, controller MCU and protective module 200, and protective module 200 is used
It is connected in series in power supply 10, load 20.
As preferred embodiment, protective module 200 includes controlled end G, first end D and second end S, controlled end connection
First end D and second end S is controlled by controlled end and is disconnected in controller MCU, controller MCU.In the present embodiment, protective module
200 include NMOS tube Q1.Controlled end G is drawn from the grid of NMOS tube Q1, source electrode draws first end D, and second end S is drawn in drain electrode.
In the present embodiment, as shown in Figure 1, the output end INPUT of power supply 10 is connected to a pole of load 20,20 are loaded
Another pole is connected to first end D, and the second end S of protective module 200 is connected to low level, that is, is grounded.
In another embodiment, the output end INPUT of power supply 10 is connected to first end D, and the pole for loading 20 is connected to
Two end S, another pole for loading 20 are connected to low level, that is, are grounded.
Therefore, controller MCU can realize time that connection power supply 10 is powered to load 20 by control protective module 200
Road, or 10 circuits to power to load 20 of cutting off the power are realized by control protective module 200.
As shown in Figure 1, monitoring modular 100, controller MCU, protective module 200 are sequentially connected.Monitoring modular 100 is used for
Abnormal signal is sent to controller MCU when runaway electric circuit, protective module 200 is controlled when controller MCU gets abnormal signal and is cut
Power-off source 10 is to the power supply of load 20, and after starting protection, controller MCU locks the output to protective module 200, prevents from leading to again
Electric bring risk.
Runaway electric circuit provided by the embodiment of the utility model protects circuit, by monitoring modular 100 in runaway electric circuit to
Controller MCU sends abnormal signal, and protective module 200 is controlled when controller MCU gets abnormal signal and cuts off the power 10 to negative
Carry 20 power supply；It realizes the element persistently overheating even sustained combustion for preventing from being powered on circuit, can quickly cut off the power 10 to negative
20 power supply is carried, to avoid the risk of sustained combustion.
As preferred embodiment, monitoring modular 100 includes high temperature monitoring unit 110, and high temperature monitoring unit 110 includes
First electric bridge 111 and first processor 112, the first electric bridge 111 are connected to controller MCU by first processor 112.
First electric bridge 111 includes NTC resistance NTC1, resistance R1, resistance R2, resistance R5, and resistance R1 and resistance R2's is public
Tie point formed input terminal A1, NTC resistance NTC1 and resistance R5 points of common connection formed input terminal B1, NTC resistance NTC1 and
The points of common connection that the points of common connection of resistance R1 forms output end C1, resistance R2 and resistance R5 forms output end D1；Input terminal
A voltage, i.e. voltage VCC are connected between A1 and input terminal B1；As shown in Fig. 2, the voltage INPUT that power supply 10 exports is through pressure stabilizing core
Piece or voltage conversion chip U1 are converted to voltage VCC, and voltage VCC is loaded between input terminal A1 and input terminal B1.
The resistance value of resistance R5 is within the scope of 2k Ω -10k Ω, and in the present embodiment, the resistance value of resistance R5 is 5.1k Ω；
When the resistance value of NTC resistance NTC1 is less than the resistance value of resistance R5, the transmission high temperature signal of first processor 112 is to controller MCU, i.e., different
Regular signal includes high temperature signal.NTC resistance NTC1 is the thermo-sensitive resistor of negative temperature coefficient, and resistance declines when temperature increases.Setting
The resistance value of resistance R5 is less than the resistance value of NTC resistance NTC1 when load 20 works normally, and when loading 20 operation irregularities, temperature is increased to
When to a certain degree, the resistance value of NTC resistance NTC1 is less than the resistance value of resistance R5.
Output end C1 and output end D1 are connected to first processor 112.As preferred embodiment, first processor
112 include comparator U2, and the normal phase input end of comparator U2 is connected to output end D1, and the inverting input terminal of comparator U2 is connected to
Output end C1.
When load 20 works normally, the resistance value of resistance R5 is less than the resistance value of NTC resistance NTC1, and the voltage of output end D1 is greater than
The voltage of output end C1, therefore the output of first processor 112 is first state；When temperature increases to a certain extent, NTC electricity
The resistance value for hindering NTC1 is less than the resistance value of resistance R5, and the voltage of output end D1 is less than the voltage of output end C1, therefore first processor
112 output is the second state；Second state is opposite with first state.When controller MCU detects the different of first processor 112
Regular signal or detects first processor that is, when controller MCU detects that the output of first processor 112 is the second state
112 output switches, and is judged as circuit and has occurred out of control so that temperature increases, then control protective module 200 cuts off electricity
Power supply of the source 10 to load 20.
As preferred embodiment, monitoring modular 100 includes fusing monitoring unit 120, and fusing monitoring unit 120 includes
Second electric bridge 121 and second processor 122, the second electric bridge 121 are connected to controller MCU by second processor 122.
Second electric bridge 121 includes NTC resistance NTC2, resistance R3, resistance R4, resistance R6, and resistance R3 and resistance R4's is public
The points of common connection that tie point forms input terminal A2, NTC resistance NTC2 and resistance R6 forms input terminal B2, resistance R3 and resistance R6
Points of common connection form output end C2, the points of common connection of resistance R4 and NTC resistance NTC2 forms output end D2；Input terminal A2
A voltage, i.e. voltage VCC are connected between input terminal B2；As shown in Fig. 2, the voltage INPUT that power supply 10 exports is through voltage stabilizing chip
Or voltage conversion chip U1 is converted to voltage VCC, voltage VCC is loaded between input terminal A2 and input terminal B2.
The resistance value of resistance R6 is within the scope of 500k Ω -1000k Ω, and in the present embodiment, the resistance value of resistance R6 is 820k
Ω；When the resistance value of NTC resistance NTC2 is greater than the resistance value of resistance R6, the transmission fuse signals of second processor 122 to controller MCU,
I.e. abnormal signal includes fuse signals.NTC resistance NTC2 is the thermo-sensitive resistor of negative temperature coefficient, and resistance declines when temperature increases,
But when temperature is excessively high, when NTC resistance NTC2 is blown, resistance can be considered infinitely great.The resistance value that resistance R6 is arranged is greater than load
The resistance value of NTC resistance NTC2 when 20 normal work, when NTC resistance NTC2 is blown, the resistance value of resistance R6 is less than NTC resistance
The resistance value of NTC2.
Output end C2 and output end D2 are connected to second processor 122.As preferred embodiment, second processor
122 include comparator U3, and the normal phase input end of comparator U3 is connected to output end D2, and the inverting input terminal of comparator U3 is connected to
Output end C2.
When load 20 works normally, the resistance value of resistance R6 is greater than the resistance value of NTC resistance NTC2, and the voltage of output end D2 is less than
The voltage of output end C2, therefore the output of second processor 122 is the third state；When NTC resistance NTC2 is blown, output end
The voltage of D2 is greater than the voltage of output end C2, therefore the output of second processor 122 is the 4th state；The third state and the 4th shape
State is opposite.When controller MCU detects the abnormal signal of second processor 122, i.e., when controller MCU detects second processor
122 output is four states, or detects that the output of second processor 122 switches, be judged as circuit have occurred it is out of control
So that temperature it is excessively high cause in NTC resistance NTC2 fuse, then control protective module 200 cut off the power 10 to load 20 confessions
Electricity prevents the state of affairs from expanding, and such as avoids the risk of sustained combustion.
As preferred embodiment, runaway electric circuit protection circuit further includes alarm module (not shown), and alarm module connects
It is connected to controller MCU.When controller MCU gets abnormal signal from monitoring modular 100, alarm module issues sound-light alarm.
As the further improvement of the utility model embodiment, monitoring modular 100 includes multiple 110 Hes of high temperature monitoring unit
Multiple fusing monitoring unit 120.To realize multiple spot monitoring, a protective module 200 is only needed, such as power switch, loss is few.
The runaway electric circuit protection circuit of the utility model embodiment can be used for all kinds of electronic devices, it may be assumed that
A kind of electronic device, including runaway electric circuit above-mentioned protection circuit and power supply 10 and load 20.
It is used for as preferred embodiment as shown in Fig. 2, power supply 10 includes voltage stabilizing chip or voltage conversion chip U1
The voltage INPUT of power supply 10 is converted into voltage VCC, to provide voltage for the first electric bridge 111, the second electric bridge 121.
As preferred embodiment, runaway electric circuit protects circuit to include ceramic multilayer circuit MLCC, function for loading 20
The electronic device of the easily heating device such as rate MOSFET element.
Electronic device provided by the embodiment of the utility model protects the monitoring modular 100 in circuit to exist by runaway electric circuit
Abnormal signal is sent to controller MCU when runaway electric circuit, protective module 200 is controlled when controller MCU gets abnormal signal and is cut
Power supply of the power-off source 10 to load 20；It realizes the element persistently overheating even sustained combustion for preventing from being powered on circuit, can quickly cut
Power-off source 10 is to the power supply for loading 20, to avoid the risk of sustained combustion.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (10)
1. a kind of runaway electric circuit protects circuit, it is characterised in that: including monitoring modular, controller and protective module, the protection
Module is used for and power supply, connected in series with the load；
The monitoring modular, controller, protective module are sequentially connected, and the monitoring modular is used in runaway electric circuit to the control
Device processed sends abnormal signal, and the controller controls the confession that the protective module is cut off the power to load when getting abnormal signal
Electricity.
2. runaway electric circuit as described in claim 1 protects circuit, it is characterised in that: the monitoring modular includes high temperature monitoring list
Member, the high temperature monitoring unit include the first electric bridge and first processor；
First electric bridge include NTC resistance NTC1, resistance R1, resistance R2, resistance R5, the resistance R1 and resistance R2 it is public
The points of common connection that tie point forms input terminal A1, the NTC resistance NTC1 and resistance R5 forms input terminal B1, the NTC electricity
The points of common connection for hindering NTC1 and resistance R1 forms the points of common connection formation output of output end C1, the resistance R2 and resistance R5
Hold D1；A voltage is connected between the input terminal A1 and input terminal B1, the output end C1 and output end D1 are connected to described
One processor；
The resistance value of the resistance R5 is within the scope of 2k Ω -10k Ω, and the resistance value of the NTC resistance NTC1 is less than the resistance R5
Resistance value when, the first processor sends high temperature signal to the controller.
3. runaway electric circuit as claimed in claim 2 protects circuit, it is characterised in that: the first processor includes comparator
U2, the normal phase input end of the comparator U2 are connected to the output end D1, and the inverting input terminal of the comparator U2 is connected to
The output end C1.
4. runaway electric circuit as claimed in claim 2 protects circuit, it is characterised in that: the monitoring modular includes that fusing monitoring is single
Member, the fusing monitoring unit include the second electric bridge and second processor；
Second electric bridge include NTC resistance NTC2, resistance R3, resistance R4, resistance R6, the resistance R3 and resistance R4 it is public
The points of common connection that tie point forms input terminal A2, the NTC resistance NTC2 and resistance R6 forms input terminal B2, the resistance R3
The points of common connection for forming output end C2, the resistance R4 and NTC resistance NTC2 with the points of common connection of resistance R6 forms output
Hold D2；A voltage is connected between the input terminal A2 and input terminal B2, the output end C2 and output end D2 are connected to described
Two processors；
The resistance value of the resistance R6 is within the scope of 500k Ω -1000k Ω, and the resistance value of the NTC resistance NTC2 is greater than the electricity
When hindering the resistance value of R6, the second processor sends fuse signals to the controller.
5. runaway electric circuit as claimed in claim 4 protects circuit, it is characterised in that: the second processor includes comparator
U3, the normal phase input end of the comparator U3 are connected to the output end D2, and the inverting input terminal of the comparator U3 is connected to
The output end C2.
6. runaway electric circuit as claimed in claim 1 or 2 protects circuit, it is characterised in that: the protective module include controlled end,
First end and second end, the controlled end are connected to the controller, and the controller controls described the by the controlled end
One end and second end disconnect；
Power supply is connected to load, and load is connected to the first end, and the second end is connected to low level；Or
Power supply is connected to the first end, and load is connected to the second end.
7. runaway electric circuit as claimed in claim 1 or 2 protects circuit, it is characterised in that: it further include alarm module, the alarm
Module is connected to the controller.
8. runaway electric circuit as claimed in claim 4 protects circuit, it is characterised in that: the monitoring modular includes multiple height
Warm monitoring unit and multiple fusing monitoring unit.
9. a kind of electronic device, it is characterised in that: including runaway electric circuit protection electricity such as of any of claims 1-8
Road and power supply and load.
10. electronic device as claimed in claim 9, it is characterised in that: the power supply includes voltage stabilizing chip or voltage conversion core
Piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821122490.2U CN208767775U (en) | 2018-07-13 | 2018-07-13 | A kind of runaway electric circuit protection circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821122490.2U CN208767775U (en) | 2018-07-13 | 2018-07-13 | A kind of runaway electric circuit protection circuit and electronic device |
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| Publication Number | Publication Date |
|---|---|
| CN208767775U true CN208767775U (en) | 2019-04-19 |
Family
ID=66128555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821122490.2U Active CN208767775U (en) | 2018-07-13 | 2018-07-13 | A kind of runaway electric circuit protection circuit and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208767775U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736440A (en) * | 2018-07-13 | 2018-11-02 | 深圳市华宝新能源股份有限公司 | A kind of runaway electric circuit protection circuit and electronic device |
| CN114721859A (en) * | 2022-04-29 | 2022-07-08 | 苏州浪潮智能科技有限公司 | Method and device for monitoring MLCC (multilayer ceramic capacitor) short circuit risk and storage medium |
-
2018
- 2018-07-13 CN CN201821122490.2U patent/CN208767775U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736440A (en) * | 2018-07-13 | 2018-11-02 | 深圳市华宝新能源股份有限公司 | A kind of runaway electric circuit protection circuit and electronic device |
| CN108736440B (en) * | 2018-07-13 | 2024-01-26 | 深圳市华宝新能源股份有限公司 | Circuit out-of-control protection circuit and electronic device |
| CN114721859A (en) * | 2022-04-29 | 2022-07-08 | 苏州浪潮智能科技有限公司 | Method and device for monitoring MLCC (multilayer ceramic capacitor) short circuit risk and storage medium |
| CN114721859B (en) * | 2022-04-29 | 2024-05-24 | 苏州浪潮智能科技有限公司 | Method, device and storage medium for monitoring MLCC capacitor short circuit risk |
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