CN109586242A - Circuit protection method, protection circuit and circuit protection device - Google Patents
Circuit protection method, protection circuit and circuit protection device Download PDFInfo
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- CN109586242A CN109586242A CN201710910818.0A CN201710910818A CN109586242A CN 109586242 A CN109586242 A CN 109586242A CN 201710910818 A CN201710910818 A CN 201710910818A CN 109586242 A CN109586242 A CN 109586242A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
Circuit protection method, protection circuit and circuit protection device provided by the invention; by real-time detection by the current changing rate of protection circuit; if current changing rate is greater than the first predetermined current change rate; illustrate the overcurrent that abruptly increase has been likely to occur in protection circuit; the second current changing rate is calculated by way of delay, and protection act is executed by protection circuit to described according to the value of the second current changing rate；If the first current changing rate that real-time detection arrives is not more than the first predetermined current change rate; it determines the need for executing protection act by calculating by the sampled power of sample circuit in protection circuit; it can not work normally to avoid by protective current because of overcurrent; overcurrent is determined whether there is by two layers of differentiation mechanism, improves the accuracy of overcurrent protection scheme.
Description
Technical field
The present invention relates to field of display technology, and in particular to circuit protection method, protection circuit and circuit protection device.
Background technique
Power supply chip is giving AMOLED (Active-matrix organic light emitting diode, active square
Battle array organic light emitting diode) screen body power supply when, be easy to will appear and the phenomenon that ground short circuit, the feelings of high current can be generated when short-circuit
Condition, this can cause power supply chip itself and the electrical stability of entire circuit to go wrong, and then influence AMOLED screen body
Normal display function.
In view of the above-mentioned problems, generally overcurrent protection can be used to circuit, in the prior art, overcurrent protection is most common
Way be: by the way that sampling resistor is connected with by protection circuit, and then sampled to by protection circuit, formed sampling electricity
Sampled voltage, is then compared by pressure with the voltage threshold of setting, when sampled voltage is more than threshold value, passes through protection member
Part (electromagnetic type current release, fuse etc.) executes protection act.But by comparing sampled voltage and electricity in above scheme
Pressure gate limit value determines in circuit with the presence or absence of overcurrent, does not consider the influence of the variation of electric current, and comparison result is inaccurate, is easy
Lead to problems such as abruptly increase overcurrent low-response, protection element is be easy to cause to malfunction.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that in the prior art the accuracy of overcurrent protection scheme it is lower, rapid
Increase overcurrent low-response.To provide overcurrent protection method, device and circuit.
In view of this, the first aspect of the embodiment of the present invention provides a kind of circuit protection method, comprising: acquisition is protected
First current changing rate of circuit；Judge whether first current changing rate exceeds the first predetermined current threshold；When described
When one current changing rate exceeds the first predetermined current threshold, prolonging after being delayed according to current flow signal and by current flow signal
When current signal calculate the second current changing rate；Judge whether second current changing rate exceeds the second predetermined current threshold；
When the second current changing rate exceeds the second predetermined current threshold, protection act is executed.
Optionally, it when first current changing rate is without departing from the first predetermined current threshold, calculates by protection circuit
Current power；Judge whether the current power exceeds predetermined power threshold value；When the current power exceeds predetermined power threshold value
When, then execute protection act.
Optionally, described to calculate the according to current flow signal and by the delaying current signal after the delay of current flow signal
The step of two current changing rates, comprising: calculate the current differential of the current flow signal and the delaying current signal；By institute
It states current differential to differentiate to the time of delay, obtains second current changing rate.
Second aspect of the embodiment of the present invention provides a kind of protection circuit, comprising: sampling unit, for sampling by protection circuit
Current signal；The first branch, including delay circuit and current changing rate computing unit and current trigger unit, sampling unit it is defeated
Current flow signal out exports delaying current signal, the delaying current signal and current flow letter after delay circuit is handled
Number input current changing rate computing unit calculates third current changing rate, and the third current changing rate is sent to the electricity
Flow trigger unit；When the third current change quantity is greater than third predetermined current threshold, the current trigger unit triggers protection
Switch；Branch selecting unit is connect with the sampling unit, for detect it is big by the 4th current changing rate of protection circuit
When four predetermined current thresholds, the sampling unit is connected to the first branch.
It optionally, further include second branch, including power calculation unit and power trigger unit, the power calculation unit
It is connect with sampling unit, for calculating by the current power of protection circuit；The current power inputs the power trigger unit,
When the current power is greater than predetermined power threshold value, the power trigger unit triggers protective switch；The branch selecting unit
When the change rate of the current signal detected is not greater than the first predetermined current threshold, by the sampling unit and the second branch
Connection.
Optionally, the current changing rate computing unit includes subtraction circuit and differentiation element, the delaying current signal
The subtraction circuit, which is inputted, with the current flow signal exports current differential, the current differential inputs the differentiation element,
It calculates the current differential to differentiate to the time of delay circuit, obtains the third current changing rate.
The third aspect of the embodiment of the present invention also provides a kind of circuit protection device, comprising: obtains module, is protected for obtaining
First current changing rate of protection circuit；First judgment module, for judging it is pre- whether first current changing rate exceeds first
If current threshold；Be delayed computing module, for when first current changing rate exceeds the first predetermined current threshold, according to working as
Preceding current signal and by current flow signal delay after delaying current signal calculate the second current changing rate；Second judges mould
Block, for judging whether second current changing rate exceeds the second predetermined current threshold；First protective module, for when second
When current changing rate exceeds the second predetermined current threshold, protection act is executed.
Optionally, further includes: power computation module, for when first current changing rate is without departing from the first predetermined current
When threshold value, calculate by the current power of protection circuit；
Third judgment module, for judging whether the current power exceeds predetermined power threshold value；
Second protective module, for when the current power exceeds predetermined power threshold value, then executing protection act.
The third aspect of the embodiment of the present invention also provides a kind of circuit protection device, comprising: at least one processor；And with
The memory of at least one processor communication connection；Wherein, the memory be stored with can by it is described at least one processing
The instruction that device executes, described instruction are executed by least one described processor, so that described in the execution of at least one described processor
Circuit protection method.
The 5th aspect of the embodiment of the present invention also provides a kind of non-transitory computer-readable medium, is stored thereon with computer journey
Sequence realizes the circuit protection method when program is executed by processor.
Technical solution of the present invention has the advantage that
1. circuit protection method provided in an embodiment of the present invention, protection circuit and circuit protection device, pass through real-time detection
By the current changing rate of protection circuit, if current changing rate is greater than the first predetermined current change rate, illustrate by protection electricity
It has been likely to occur the overcurrent of abruptly increase in road, the second current changing rate has been calculated by way of delay, and become according to the second electric current
The value of rate to execute protection act by protection circuit to described, in this way, solving overcurrent protection electricity existing in the prior art
Road can not accurately to abruptly increase overcurrent quick response defect, avoid abruptly increase overcurrent give by protection circuit bring damage.
2. circuit protection method provided in an embodiment of the present invention, protection circuit and circuit protection device, if real-time detection
The first current changing rate arrived is not more than the first predetermined current change rate, illustrates not occurred abruptly increase in protection circuit excessively electric
Stream, it is understood that there may be the slow high current of change rate, therefore determined by calculating by the sampled power of sample circuit in protection circuit
Whether protection act is needed to be implemented, if sampled power is more than predetermined threshold value, although illustrating by there is no rapid in protection circuit
Increase overcurrent, but still have other kinds of overcurrent, then protection act is executed to by protection circuit, to avoid being protected
Electric current can not work normally because of overcurrent, in this way, determining whether there is overcurrent by two layers of differentiation mechanism, improve electricity
Flow the accuracy of protection scheme.
3. circuit protection method provided in an embodiment of the present invention, protection circuit and circuit protection device, by establishing bilateral
Road testing mechanism, wherein power channels (power-sensing circuit) detect the slow overcurrent of current changing rate, differentiation channel (change rate
Detection circuit) as the quick response to abruptly increase high current, protection scope covering comprehensively so that screen body under current state not
It is damaged.
4. circuit protection method provided in an embodiment of the present invention, protection circuit and circuit protection device, by the way that letter will be sampled
Number it is divided into two branches, a branch obtains time delayed signal (sampled signal values as last moment) by delay circuit, will
Time delayed signal and current sampled signal carry out difference calculating, and difference differentiates to the time of delay circuit, and electric current can be obtained
Change rate；With pass through and then two time point sampled current values in the prior art calculating current difference and time difference, both
The scheme for being divided by obtain current transformation rate is compared, it is only necessary to two sampled signal values can be obtained in a time point sampling, then exist
In the identical sampling time, sampling number is one times more, reduces sampling error, improves the accuracy of sampled result.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of the circuit protection method of the embodiment of the present invention 1；
Fig. 2 is the schematic diagram of the embodiment of the present invention 1 changed over time by electric current in protection circuit；
Fig. 3 is the schematic diagram of the protection circuit of the embodiment of the present invention 2；
Fig. 4 is a schematic diagram of the circuit protection device of the embodiment of the present invention 3.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second ", " third " are used for description purposes only,
It is not understood to indicate or imply relative importance.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
Embodiment 1
The present embodiment provides a kind of circuit protection method, it is applicable to the interlock circuit of the power supply chip to AMOLED screen body
Carrying out overcurrent protection can also be realized as shown in Figure 1, this method can be realized by software by hardware circuit, this
In embodiment, which is realized by software, and sampling resistor is arranged in the output loop of power supply chip, to adopt
Collect the electric current in the circuit, by the current value input controller, which executes following methods, by way of software
It realizes circuit protection, includes the following steps:
S11: obtaining by the first current changing rate of protection circuit, i.e. real-time detection by the current changing rate of protection circuit,
Specifically, the high current (i.e. overcurrent) that different electrical power and ground short circuit generate, because of difference existing for respective circuit, high current is generated
Change rate will be different；For abruptly increase high current, change rate is very fast, therefore, in order to accurately detect whether electricity
Stream exists, and real-time detection is by the first current changing rate of protection circuit first.The first current changing rate herein can be by obtaining
The current value at two time points is taken, so that calculating current variable quantity, calculates current changing rate according to the difference at two time points.
S12: judge whether first current changing rate exceeds the first predetermined current threshold.
When current changing rate is larger, judge the sudden high currents in circuit compared with subject to by current changing rate
Really, when current changing rate is lesser, it is difficult to judge by current changing rate, overpowering size can be led to judge.Cause
This, is judged for different current changing rates, can preferably improve the accuracy of judgement.
For different by protection circuit, in the case where guaranteeing its normal work, existing overcurrent can be allowed
Change rate is different, and therefore, default change rate can be depending on physical circuit, it is therefore an objective to guarantee be less than the default variation
In the case where rate, it can be worked normally by protection circuit, if first current changing rate exceeds the first predetermined current threshold,
S13-S15 is then entered step, S16-S18 is otherwise entered step.
S13: when first current changing rate exceeds the first predetermined current threshold, according to current flow signal and will work as
Delaying current signal after preceding current signal delay calculates the second current changing rate.
Wherein current flow signal is the current flow signal acquired in real time, the current signal after the delay of current flow signal
For delaying current signal, can be calculated according to the difference of the delaying current signal after delay and current flow signal this moment
Two current changing rates.
In order to which the second current changing rate of each time point can be obtained in real time, herein in the following way:
Calculate the current differential of the current flow signal and the delaying current signal；
Time of the current differential to delay is differentiated, second current changing rate is obtained.
The high current (i.e. overcurrent) that different electrical power and ground short circuit generate, because of difference existing for respective circuit, high current is produced
Raw change rate will be different, for example, being directed to the high current of abruptly increase, time differential value is electric much larger than under normal circumstances
Time differential value is flowed, therefore can determine its change rate with the mode differentiated；As shown in Fig. 2, in the same time, Δ
I2/ Δ T is significantly greater than Δ I1/ Δ T, the detection range that it is covered by way of differential such as the range institute that arrow indicates in Fig. 2
Show.By the way that time delayed signal and current sampled signal are carried out difference calculating, difference is differentiated to the time of delay circuit, can be obtained
To the change rate of electric current, so not only calculate simply, but also more can accurately embody the change rate of electric current.
S14, judge whether second current changing rate exceeds the second predetermined current threshold, executed when beyond second threshold
Otherwise step S15 does not execute any movement.
Second predetermined current threshold is according to the electric current for needing to be set greater than the first predetermined current threshold in circuit
Value, such as the first predetermined current threshold are 0.02mA-0.05mA；Second preset threshold is 0.08mA-0.10mA.
S15, when the second current changing rate exceed the second predetermined current threshold when, to by protection circuit execute protection act.
If the second current changing rate exceeds the second predetermined current threshold, illustrate to be likely to occur the excessively electric of abruptly increase in protection circuit
Stream then executes protection act to by protection circuit, in this way, solving current foldback circuit existing in the prior art can not be accurate
To the defect of abruptly increase overcurrent quick response, avoids abruptly increase overcurrent and damaged to by protection circuit bring.
S16, when the first current changing rate is less than the first predetermined current threshold, calculate by sample circuit in protection circuit
Sampled power.
If the first current changing rate that real-time detection arrives less than the first predetermined current threshold, illustrates do not had in protection circuit
Abruptly increase overcurrent is occurred, it is possible that the overcurrent slow there are change rate, then sampled electricity by calculating in protection circuit
The sampled power on road come determine whether execute protection act.
S17: judging whether the current power exceeds predetermined power threshold value, and step S18 is executed when exceeding, is not otherwise executed
Protection act.
If sampled power is more than predetermined threshold value, although illustrating that abruptly increase overcurrent is not present in protection circuit,
There are still other kinds of overcurrent, then to by protection circuit execute protection act, to avoid by protective current because of overcurrent
And can not work normally, in this way, determining whether there is overcurrent by two layers of differentiation mechanism, improve overcurrent protection scheme
Accuracy.
S18: when the current power exceeds predetermined power threshold value, then protection act is executed.It is more than pre- in sampled power
When gating limit value, protection act is executed to by protection circuit.Improve the security reliability of circuit.
As a preferred embodiment, step S11 can specifically include: obtain the sample rate current of sample circuit；It will sampling electricity
Stream input has the delayer of default delay time, and output obtains delaying current；Electricity is calculated according to sample rate current and delaying current
Rheology rate.Here it by the way that sample rate current is obtained delaying current by delay, is counted according to sample rate current and its delaying current
Calculate current changing rate, it is only necessary to which current changing rate can be obtained in step acquisition, simplifies sampling operation, and due to reducing sampling
Number, to reduce because of sampling process bring error, so that calculated result is more accurate.
It as a preferred embodiment, include: to calculate sampling electricity according to sample rate current and delaying current calculating current change rate
The current differential of stream and delaying current；Current differential differentiates to the time, obtains current changing rate.Specifically, different electrical power
The high current (i.e. overcurrent) generated with ground short circuit, because of difference existing for respective circuit, the change rate that high current generates can be
Difference, for example, it is directed to the high current of abruptly increase, differential of the time differential value much larger than Current versus time under normal circumstances
Value, therefore its change rate can be determined with the mode differentiated；As shown in Fig. 2, in the same time, Δ I2/ Δ T is significantly greater than
ΔI1/ Δ T, the detection range that it is covered by way of differential is as shown in the range that arrow indicates in Fig. 2.Pass through the letter that will be delayed
Number difference calculating being carried out with current sampled signal, difference differentiates to the time of delay circuit, the change rate of electric current can be obtained,
It so not only calculates simply, but also more can accurately embody the change rate of electric current.
Overcurrent protection method provided in this embodiment, by real-time detection by the current changing rate of protection circuit, if
First current changing rate exceeds the first predetermined current threshold, illustrates the overcurrent that abruptly increase has been likely to occur in protection circuit, leads to
The judgement of overcurrent change rate further progress executes protection act to by protection circuit according to judging result, in this way, solving existing
There is the defect that current foldback circuit present in technology can not accurately to abruptly increase overcurrent quick response, avoids abruptly increase overcurrent
It is damaged to by protection circuit bring.If the current changing rate that real-time detection arrives is without departing from the first predetermined current threshold, explanation
There is not abruptly increase overcurrent in protection circuit, is then determined by calculating by the sampled power of sample circuit in protection circuit
Whether protection act is executed, if sampled power is more than predetermined threshold value, although illustrating that abruptly increase mistake is not present in protection circuit
Electric current, but still have other kinds of overcurrent, then protection act is executed to by protection circuit, to avoid by protective current
It can not work normally because of overcurrent, in this way, determining whether there is overcurrent by two layers of differentiation mechanism, improve over current protection
The accuracy of shield scheme.
Embodiment 2
A kind of protection circuit is provided in the present embodiment, the protection to power circuit is realized by way of hardware circuit, it should
Method is identical as the method in embodiment 1, but in the present embodiment is realized by hardware circuit, the protection in the present embodiment
Circuit includes sampling unit 21, the first branch 22, second branch 23, branch selecting unit 24, as shown in figure 3, specifically:
Sampling unit 21, for sampling by the current signal of protection circuit.
The first branch 22, including delay circuit and current changing rate computing unit and current trigger unit, sampling unit it is defeated
Current flow signal out exports delaying current signal, the delaying current signal and current flow letter after delay circuit is handled
Number input current changing rate computing unit calculates third current changing rate, and the third current changing rate is sent to the electricity
Flow trigger unit；When the third current change quantity is greater than third predetermined current threshold, the current trigger unit triggers protection
Switch.
Wherein, the current changing rate computing unit includes subtraction circuit and differentiation element, the delaying current signal and
The current flow signal inputs the subtraction circuit and exports current differential, and the current differential inputs the differentiation element, meter
It calculates the current differential to differentiate to the time of delay circuit, obtains the third current changing rate.
The first branch is differentiation channel detection, is mainly made of, passes through delay circuit and current changing rate computing unit
Sampled signal is divided into two branches by branch selecting unit 24, and a branch obtains delaying current signal by delay circuit and (makees
For the sampled signal values of last moment), by the current flow signal of delaying current signal and present sample by subtraction circuit into
Row difference calculates, and difference, which differentiates to the time of delay circuit, completes current changing rate calculating, and the change rate of electric current can be obtained；If
Current trigger unit determine the change rate be greater than default change rate (at this time electric current compare trigger unit export low level to level at
Manage unit), then level processing unit is determined with the fast high current of change rate and generates.
Second branch 23, including power calculation unit and power trigger unit, the power calculation unit and sampling unit
Connection, for calculating by the current power of protection circuit；The current power inputs the power trigger unit, the current function
When rate is greater than predetermined power threshold value, the power trigger unit triggers protective switch；
Second branch is that power detection channel can be obtained according to the maximum current value allowed to flow through on the circuit ELVDD, ELVSS
The maximum power allowed to sampling resistor；The slow high current of change rate uses power detection: being adopted by power calculation unit calculating
The realtime power of sample resistance R, if the performance number than continuous two periods is all larger than its maximum power value (power compares touching at this time
Bill member exports low level and gives level processing unit), then level processing unit is determined with the slow high current of change rate and generates；It is above-mentioned
After the result of two sense channels is sent into level processing unit, level processing unit controls working for starting circuit according to the result,
For example result is output low level, then switch conduction, Ctrl become low level, close power supply chip；Conversely, switch disconnects,
Ctrl level state remains unchanged.
Branch selecting unit 24 is connect with the sampling unit 21, for detecting by the 4th electric current of protection circuit
When change rate is greater than four predetermined current thresholds, the sampling unit is connected to the first branch 22；The branch selecting unit inspection
When the change rate of the current signal measured is not greater than the first predetermined current threshold, by the sampling unit 21 and the second branch
23 connections.
Overcurrent protection circuit provided in this embodiment, by establishing Dual channel detection mechanism, wherein in second branch
Power channels detect the slow overcurrent of current changing rate, and the differentiation channel in the first branch is as the quick sound to abruptly increase high current
It answers, protection scope covering is comprehensive, so that screen body is not damaged under current state；By the way that sampled signal is divided into two branch
Road, branch obtain the delay number of adopting (sampled signal values as last moment) by delay circuit, by time delayed signal with work as
Preceding sampled signal carries out difference calculating, and difference differentiates to the time of delay circuit, and the change rate of electric current can be obtained；With it is existing
It is divided by obtain electric current change with time difference, the two by calculating current difference and then two time point sampled current values in technology
The scheme for changing rate is compared, it is only necessary to two sampled signal values can be obtained in a time point sampling, operate more convenient, error
It is small, improve the accuracy of calculated result.
Embodiment 3
The present embodiment has supplied a kind of circuit protection device, is the device of the circuit protection method in corresponding embodiment 1, such as schemes
Shown in 4, comprising:
Module 31 is obtained, for obtaining by the first current changing rate of protection circuit；Referring specifically in embodiment 1 to step
The detailed description of S11.
First judgment module 32, for judging whether first current changing rate exceeds the first predetermined current threshold；Tool
Body referring in embodiment 1 to the detailed description of step S12.
Be delayed computing module 33, for when first current changing rate exceeds the first predetermined current threshold, according to working as
Preceding current signal and by current flow signal delay after delaying current signal calculate the second current changing rate；Referring specifically to implementation
To the detailed description of step S13 in example 1.
Second judgment module 34, for judging whether second current changing rate exceeds the second predetermined current threshold；Tool
Body referring in embodiment 1 to the detailed description of step S14.
First protective module 35, for it is dynamic to execute protection when the second current changing rate exceeds the second predetermined current threshold
Make.Referring specifically in embodiment 1 to the detailed description of step S15.
Furthermore, further includes:
Power computation module 36, for calculating when first current changing rate is without departing from the first predetermined current threshold
By the current power of protection circuit；Referring specifically in embodiment 1 to the detailed description of step S16.
Third judgment module 37, for judging whether the current power exceeds predetermined power threshold value；Referring specifically to implementation
To the detailed description of step S17 in example 1.
Second protective module 38, for when the current power exceeds predetermined power threshold value, then executing protection act.Tool
Body referring in embodiment 1 to the detailed description of step S18.
In addition, also providing a kind of circuit protection device in the present embodiment, including at least one processor；And with it is described extremely
The memory of few processor communication connection；Wherein, the memory, which is stored with, to be executed by least one described processor
Instruction, described instruction executed by least one described processor, so that at least one described processor executes institute in embodiment 1
The circuit protection method stated.
In addition, also providing a kind of non-transitory computer-readable medium in the present embodiment, it is stored thereon with computer program,
It is characterized in that, circuit protection method described in embodiment 1 is realized when which is executed by processor.
Circuit protection device provided in this embodiment, by real-time detection by the current changing rate of protection circuit, if
One current changing rate exceeds the first predetermined current threshold, illustrates the overcurrent for being likely to occur abruptly increase in protection circuit, passes through
Protection act is executed to by protection circuit after further judging the change rate of current flow, in this way, solving in the prior art
Existing current foldback circuit can not accurately to abruptly increase overcurrent quick response defect, avoid abruptly increase overcurrent to being protected
The damage of circuit bring.If the first current changing rate that real-time detection arrives without departing from the first predetermined current threshold, illustrates to be protected
Do not occur abruptly increase overcurrent in protection circuit, is then determined whether by calculating by the sampled power of sample circuit in protection circuit
Protection act is executed, if sampled power is more than predetermined threshold value, although illustrating that abruptly increase overcurrent is not present in protection circuit,
But still have other kinds of overcurrent, then to by protection circuit execute protection act, to avoid by protective current because of mistake
Electric current and can not work normally, in this way, determining whether there is overcurrent by two layers of differentiation mechanism, improve overcurrent protection side
The accuracy of case.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of circuit protection method characterized by comprising
It obtains by the first current changing rate of protection circuit；
Judge whether first current changing rate exceeds the first predetermined current threshold；
When first current changing rate exceeds the first predetermined current threshold, believe according to current flow signal and by current flow
Number delay after delaying current signal calculate the second current changing rate；
Judge whether second current changing rate exceeds the second predetermined current threshold；
When the second current changing rate exceeds the second predetermined current threshold, protection act is executed.
2. the method according to claim 1, wherein further include: when first current changing rate is without departing from
When one predetermined current threshold, calculate by the current power of protection circuit；
Judge whether the current power exceeds predetermined power threshold value；
When the current power exceeds predetermined power threshold value, then protection act is executed.
3. method according to claim 1 or 2, which is characterized in that described according to current flow signal and by current flow
The step of delaying current signal after signal delay calculates the second current changing rate, comprising:
Calculate the current differential of the current flow signal and the delaying current signal；
Time of the current differential to delay is differentiated, second current changing rate is obtained.
4. a kind of protection circuit characterized by comprising
Sampling unit, for sampling by the current signal of protection circuit；
The first branch, including delay circuit and current changing rate computing unit and current trigger unit, sampling unit output are worked as
Preceding current signal exports delaying current signal, the delaying current signal and the input of current flow signal after delay circuit is handled
The current changing rate computing unit calculates third current changing rate, and the third current changing rate is sent to the current trigger
Unit；When the third current change quantity is greater than third predetermined current threshold, the current trigger unit triggers protective switch；
Branch selecting unit is connect with the sampling unit, for detect it is big by the 4th current changing rate of protection circuit
When four predetermined current thresholds, the sampling unit is connected to the first branch.
5. protection circuit according to claim 3, which is characterized in that further include:
Second branch, including power calculation unit and power trigger unit, the power calculation unit are connect with sampling unit, are used
In calculating by the current power of protection circuit；The current power inputs the power trigger unit, and the current power is greater than
When predetermined power threshold value, the power trigger unit triggers protective switch；
When the change rate for the current signal that the branch selecting unit detects is not greater than the first predetermined current threshold, adopted described
Sample unit is connected to the second branch.
6. protection circuit according to claim 4 or 5, which is characterized in that the current changing rate computing unit includes subtracting
Method circuit and differentiation element, the delaying current signal and the current flow signal input the subtraction circuit and export current difference
Value, the current differential input the differentiation element, calculate the current differential and differentiate to the time of delay circuit, obtain institute
State third current changing rate.
7. a kind of circuit protection device characterized by comprising
Module is obtained, for obtaining by the first current changing rate of protection circuit；
First judgment module, for judging whether first current changing rate exceeds the first predetermined current threshold；
Be delayed computing module, is used for when first current changing rate exceeds the first predetermined current threshold, according to current flow
Signal and by current flow signal delay after delaying current signal calculate the second current changing rate；
Second judgment module, for judging whether second current changing rate exceeds the second predetermined current threshold；
First protective module, for executing protection act when the second current changing rate exceeds the second predetermined current threshold.
8. device according to claim 7, which is characterized in that further include:
Power computation module, for when first current changing rate is without departing from the first predetermined current threshold, calculating to be protected
The current power of circuit；
Third judgment module, for judging whether the current power exceeds predetermined power threshold value；
Second protective module, for when the current power exceeds predetermined power threshold value, then executing protection act.
9. a kind of circuit protection device characterized by comprising
At least one processor；And
The memory being connect at least one described processor communication；Wherein, be stored with can be by described at least one for the memory
The instruction that a processor executes, described instruction is executed by least one described processor, so that at least one described processor is held
Row circuit protection method of any of claims 1-3.
10. a kind of non-transitory computer-readable medium, is stored thereon with computer program, which is characterized in that the program is processed
Device realizes circuit protection method of any of claims 1-3 when executing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710910818.0A CN109586242B (en) | 2017-09-29 | 2017-09-29 | Circuit protection method, protection circuit and circuit protection device |
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| CN110323725A (en) * | 2019-06-25 | 2019-10-11 | 许昌许继软件技术有限公司 | A kind of DC line sample rate current modification method, differential protecting method and system |
| CN111521952A (en) * | 2020-05-08 | 2020-08-11 | 红河学院 | Synchronous rectification circuit, charger and synchronous rectification circuit control method and system |
| CN113161983A (en) * | 2021-03-29 | 2021-07-23 | 重庆大学 | Power transmission line self-adaptive overload protection method considering dynamic thermal characteristics |
| CN115277330A (en) * | 2022-08-03 | 2022-11-01 | 珠海格力电器股份有限公司 | Signal transmission device, method, apparatus and storage medium |
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