CN110265960A - A kind of protection circuit - Google Patents
A kind of protection circuit Download PDFInfo
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- CN110265960A CN110265960A CN201910578861.0A CN201910578861A CN110265960A CN 110265960 A CN110265960 A CN 110265960A CN 201910578861 A CN201910578861 A CN 201910578861A CN 110265960 A CN110265960 A CN 110265960A
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- signal
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- described instruction
- protection circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/002—Switching arrangements with several input- or output terminals
- H03K17/005—Switching arrangements with several input- or output terminals with several inputs only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of protection circuit, comparison module is used to judge the size relation of measured signal and a threshold value, if measured signal is not within the threshold range, output abnormality signal, if measured signal in threshold range, output normal signal.Noise masking signal generation module is for judging that measured signal whether there is noise signal, and there are issue command pulse when noise signal in measured signal；Processing module if there is abnormal signal, judges whether there is command pulse, if there is command pulse, shields the output of comparison module, command end issues normal instructions, if command end issues protection instruction without command pulse for judging whether there is abnormal signal；If being no different regular signal, command end issues normal instructions.Protection circuit can be shielded effectively by noise masking signal generation module since electronic device is switched on or off the current or voltage spike of moment generation, and not need to increase RC filtering, will not ensure that the real-time of protection circuit to delay is brought by measured signal.
Description
Technical field
The invention belongs to power electronics fields, more particularly, to a kind of protection circuit.
Background technique
In Switching Power Supply, motor driven, UPS (Uninterruptible Power Supply), inverter, PWM (pulse
Width modulated) in the applied power electronics circuit such as power amplifier, in order to guarantee the normal work of circuit, it is often necessary to integrate a variety of protections
Function, such as under-voltage protection, averaged overcurrent protection, short-circuit protection.By taking short-circuit protection as an example, function is detection by power tube
The real-time current of (triode, MOSFET, IGBT etc.).After the current peak of power tube is more than certain threshold value, circuit is protected
Meeting switch-off power pipe, it is ensured that the electric current passed through in power device is no more than the rated value of device.But it answers power electronics is practical
Used time, many signals are mingled with noise, such as the current signal that power tube above-mentioned flows through, open in power tube or
The moment of shutdown can generate very big current spike, such as due to the reverse recovery characteristic of power tube and the characteristic of parasitic capacitance
The fruit current spike is more than the threshold value of protection circuit, then just it is easy to appear error protection actions.In order to solve protection circuit
Accidentally protection problem, there are mainly two types of thinkings for the prior art, and first method is the filtering increased to signal, such as return to sampling
Current signal carry out RC filtering；Second method is the output end progress multiple repairing weld in comparison circuit, guarantees triggering level
Useful signal is just considered after continuing for some time.In two kinds of above-mentioned thinkings, the shortcomings that first method is to increase filtering
After delay can be brought to original signal, in certain occasions (such as voltage is relatively high, and MOS reverse recovery characteristic is bad), noise
Spike may be very big, and filter constant will be added to the timeliness for doing so will be greatly reduced protection circuit very greatly.And for second
Kind method, it is more using having compared, inside many high-end controllers, it has been integrated with this function, such as STM32F4
The single-chip microcontroller of series, crosses flow control pin BKIN and is just integrated with the function of counting.But many occasions are in order to reduce cost, nothing
Method uses high-end controller, and if oneself is realized using logic gate, cost and circuit area can all increase.
The patent of Chinese patent (application No. is CN105634260A), provides a kind of output short circuit protection circuit, specific side
What case used is exactly second method, including comparison circuit and counting circuit.The signal of comparison circuit output gives counting electricity
Road count down to certain value and is just considered significant level, switch-off power pipe later；If before counting down to certain threshold value, comparator
Signal is restored to nonprotected state again, then it is assumed that is inactive level, does not then turn off power tube.
It is, therefore, desirable to provide a kind of take into account real-time and protection circuit at low cost.
Summary of the invention
The purpose of the present invention is to provide a kind of protection circuits, big for solving meeting after filtering in the prior art due to increasing
The big timeliness and problem at high cost for reducing protection circuit.
In order to solve the above-mentioned technical problem, the present invention proposes a kind of protection circuit, is used for an electronic device, including compare mould
Block, noise masking signal generation module and processing module, the real-time current or voltage for flowing through the electronic device are letter to be measured
Number；
The input terminal of the comparison module connects the measured signal, and the output end of the comparison module connects the processing
The input terminal of module, the comparison module is used to judge the size relation of the measured signal and a threshold value, if the letter to be measured
Number not in the range of the threshold value, then output abnormality signal, if the measured signal exports just in the threshold range
Regular signal；
The noise masking signal generation module connects the input terminal of the processing module, and the noise masking signal generates
Module is in the measured signal, there are issue command pulse when noise signal；
The output end of the processing module is as command end for issuing normal instructions or protection instruction, described instruction end hair
Out when the normal instructions, the electronic device is not turned off and turns off the electronics when described instruction end issues protection instruction
Device；
The processing module is for judging whether there is the abnormal signal；
If there is the abnormal signal, described instruction pulse is judged whether there is；If there is the command pulse, described in shielding
The output of comparison module, described instruction end issue the normal instructions, if without described instruction pulse, described in the sending of described instruction end
Protection instruction；
If described instruction end issues normal instructions without the abnormal signal.
Optionally, the processing module includes a signal synthesis circuit, and the output end of the signal synthesis circuit is as institute
State command end.
Optionally, the signal synthesis circuit includes and diode；
The input terminal of the diode connects the noise masking signal generation module, the output end of the comparison module with
The output end of the diode connects and is used as described instruction end.
Optionally, the signal synthesis circuit includes OR circuit；
Two input terminals of the OR circuit be separately connected the comparison module output end and the noise shielding
The output end of signal generator module, the OR circuit is used as described instruction end.
Optionally, the signal synthesis circuit includes AND gate circuit；
Two input terminals of the AND gate circuit be separately connected the comparison module output end and the noise shielding
The output end of signal generator module, the AND gate circuit is used as described instruction end.
Optionally, the signal synthesis circuit includes triode；
The input terminal of the triode connects the noise masking signal generation module, the output end of the comparison module with
The output end of the triode connects and is used as described instruction end.
Optionally, for the electronic device when being switched on or off, the noise masking signal generation module issues instruction arteries and veins
Punching.
Optionally, the noise masking signal generation module is arranged in a chip, and the chip is for adjusting the finger
Enable the pulse width of pulse.
Optionally, the chip is also used to control the on-off of the electronic device.
Optionally, the comparison module includes comparator, operational amplifier, the device with comparator or puts with operation
The device of big device.
The present invention proposes a kind of protection circuit, including comparison module, noise masking signal generation module and processing module.
Two input terminals of processing module are separately connected comparison module and noise masking signal generation module.The comparison module is used for
The size relation of the measured signal and a threshold value is judged, if the measured signal exports not in the range of the threshold value
Abnormal signal, if the measured signal exports normal signal in the threshold range.The noise masking signal generates mould
With the presence or absence of noise signal, and in the measured signal, there are instruction is issued when noise signal for judging the measured signal for block
Pulse；The processing module is for judging whether there is the abnormal signal, if there is the abnormal signal, judges whether there is described
Command pulse shields the output of the comparison module if there is the command pulse, and described instruction end issues the normal finger
It enables, if described instruction end issues the protection instruction without described instruction pulse；If without the abnormal signal, described instruction end hair
Normal instructions out.Protection circuit proposed by the present invention can effectively be shielded due to electronic device by noise masking signal generation module
It is switched on or off the current or voltage spike of moment generation, and does not need to increase RC filtering, will not be prolonged to being brought by measured signal
When, it ensure that the real-time of protection circuit.
Further, processing module can be ultralow by diode, resistance or NOT gate or with door or triode etc.
The device of cost is realized, and noise masking signal generation module is generally realized using the module of circuit main control chip, without
Carry out additional devices.Therefore cost is relatively low, effectively reduces the cost of hardware.
Further, it using the module of main control chip as noise masking signal generation module, can very simply adjust
The pulse width of whole command pulse, therefore the shielding time is adjustable, is adapted to different application scene.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram for protecting circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of protection circuit using diode provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of the protection circuit of a kind of utilization provided in an embodiment of the present invention or door；
Fig. 4 is a kind of schematic diagram using the protection circuit with door provided in an embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of protection circuit using triode provided in an embodiment of the present invention；
10- comparison module, 20- noise masking signal generation module, 30- processing module, 301- first resistor, bis- pole 302-
Pipe, 303- OR circuit, 304- AND gate circuit, 305- second resistance, 306- triode, 40- command end
Specific embodiment
A specific embodiment of the invention is described in more detail below in conjunction with schematic diagram.According to following description and
Claims, advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and
Using non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
In the description of the present invention, it is to be understood that, the instructions such as term " center ", "upper", "lower", "left", "right"
Orientation or positional relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is at least two, such as two
It is a, three etc., unless otherwise specifically defined.
As shown in Figures 1 to 5, the embodiment of the present invention provides a kind of protection circuit, is used for an electronic device, including compare mould
Block 10, noise masking signal generation module 20 and processing module 30, the real-time current or voltage for flowing through the electronic device are
Measured signal.
The input terminal of the comparison module 10 connects the measured signal, described in the output end connection of the comparison module 10
The input terminal of processing module 30, the comparison module 10 is used to judge the size relation of the measured signal and a threshold value, if institute
Measured signal is stated not in the range of the threshold value, then output abnormality signal, if the measured signal in the threshold range,
Then export normal signal.
The noise masking signal generation module 20 connects the input terminal of the processing module 30, the noise masking signal
Generation module 20 is in the measured signal, there are issue command pulse when noise signal.
The output end of the processing module 30 is as command end 40 for issuing normal instructions or protection instruction, described instruction
When end 40 issues the normal instructions, the electronic device is not turned off, when described instruction end 40 issues protection instruction, shutdown
The electronic device.
The processing module 30, if there is the abnormal signal, judges whether for judging whether there is the abnormal signal
There is the command pulse, if there is the command pulse, shields the output of the comparison module 10, described instruction end 40 issues institute
Normal instructions are stated, if described instruction end 40 issues the protection instruction without described instruction pulse；If without the abnormal signal, institute
It states command end 40 and issues normal instructions.
A kind of protection circuit provided in an embodiment of the present invention, utilizes comparison module 10, noise masking signal generation module 20
And processing module 30, two input terminals of the processing module 30 are separately connected the comparison module 10 and the noise screen
Cover signal generator module 20.When measured signal is not in set threshold range, the protection circuit can export an institute
Abnormal signal is stated, at this point, the processing module 30 judges whether the noise masking signal generation module 20 issues instruction arteries and veins
Punching namely the processing module 30 can judge that the measured signal whether there is by the noise masking signal generation module 20
Noise selects the output for shielding the comparison module 10 if the processing module 30 judges the measured signal there are noise,
The electronic device is not turned off.If the processing module 30 judges the measured signal, there is no noises, turn off the electronics
Device is to protect the electronic device.When measured signal is without departing from set threshold range, the protection circuit can be defeated
A normal signal out at this point, the electronic device does not need shutdown protection, therefore does not turn off the electronic device.It needs
It is noted that being, and the not all moment is required to judge whether there is noise, there is noise in many cases in practical application
At the time of be known in fact, such as metal-oxide-semiconductor switching moments just have noise certainly, at this time without judging whether there is noise,
Directly normal instructions are sent to shield the output of the comparison module 10 at this moment.
It should be noted that the abnormal signal and the normal signal can actually be a binary instructions, it can
Defining the abnormal signal is 1 or 0, and similarly, the normal signal can also correspondingly be defined as 0 or 1.It specifically need to be according to circuit
Logical relation selects.Here 1 or 0 is exactly high level or low level in fact, for example, when the measured signal exceeds the threshold
When being worth range, the comparison module 10 can be according to setting output high level or low level, when the measured signal is without departing from institute
When stating threshold range, the comparison module 10 can be according to setting output low level or high level.Normal instructions and described
Protection instruction is also similar, and can define the normal instructions is 1 or 0, and similarly, the protection instruction can also correspondingly be defined as 0
Or 1.Here 1 or 0 is exactly high level or low level in fact, for example, if defining high level represents the normal instructions, low level
Represent protection instruction, then issue the stage of command pulse in the noise masking signal generation module 20, no matter the ratio
Voltage compared with the output of module 10 is high level or low level, and the output of the processing module 30 is high level.The finger
Enable pulse with it is previously described similar, can define and issue described instruction pulse is 1 or 0, similarly, described without issuing the finger
Enable pulse that can also correspondingly be defined as 0 or 1.
By being analyzed above as can be seen that the abnormal signal, the normal signal, the normal instructions, the protection
There are many combination, these both depend on the logical relation of circuit, actually finally take for the definition of instruction and described instruction pulse
Certainly in the logical relation of the processing module 30.The processing module 30 is responsible for the processing abnormal signal, the normal signal
And described instruction pulse, and the normal instructions or protection instruction are provided, it can be by gate circuit or other kinds of
Circuit is realized.
Optionally, the processing module 30 includes a signal synthesis circuit, the output end conduct of the signal synthesis circuit
Described instruction end 40.
Optionally, as shown in Fig. 2, the signal synthesis circuit may include first resistor 301 and diode 302.It is described
The input terminal of first resistor 301 connects the output end of the comparison module 10, makes an uproar described in the input terminal connection of the diode 302
Acoustic shielding signal generator module 20, the output end of the first resistor 301 and the output end of the diode 302 are connected in parallel
And it is used as described instruction end 40.In embodiments of the present invention, the output of the comparison module 10 terminates a first resistor 301,
However, it is possible to do not have to connect first resistor 301, for example, when the comparison module 10 is the comparator of open-drain type output, noise screen
Cover signal generator module 20 issue low level represent described instruction pulse, at this point, the output of the comparison module 10 there is no need to
First resistor 301 is connect again.
Accordingly, the abnormal signal may be defined as 0 namely low level, and the normal signal is defined as 1 namely high level,
If the measured signal exceeds the threshold range, the comparison module 10 can export low level according to setting, when it is described to
When surveying signal without departing from the threshold range, the comparison module 10 can export high level according to setting.Described instruction pulse
It is effective to may be defined as high level, namely detects in measured signal that described instruction pulse sends 1 namely high level when having noise.
The corresponding normal instructions may be defined as 1 namely high level, and the protection instruction may be defined as 0 namely namely low level.Example
Such as, when detecting has noise in measured signal, described instruction pulse sends 1 namely high level, by the diode 302,
What no matter the comparison module 10 exported is abnormal signal or normal signal, and what the processing module 30 exported will be high electricity
Flat namely normal instructions, at this point, not having to turn off the electronic device.When detecting noiseless in measured signal, described instruction
Pulse sends 0 namely low level, at this point, the processing module 30 can be defeated if the output of the comparison module 10 is abnormal signal
Low level out, namely protection instruction, turn off the electronic device；If what the comparison module 10 exported is normal signal, described
Processing module 30 can export high level namely normal instructions, at this point, not having to turn off the electronic device.
Optionally, as shown in figure 3, the signal synthesis circuit may also include OR circuit 303.The OR circuit 303
Two input terminals be separately connected the output end and the noise masking signal generation module 20 of the comparison module 10, it is described
The output end of OR circuit 303 is used as described instruction end 40.
Accordingly, the abnormal signal may be defined as 0 namely low level, and the normal signal is defined as 1 namely high level,
If the measured signal exceeds the threshold range, the comparison module 10 can export low level according to setting, when it is described to
When surveying signal without departing from the threshold range, the comparison module 10 can export high level according to setting.Described instruction pulse
It is effective to may be defined as high level, namely detects in measured signal that described instruction pulse sends 1 namely high level when having noise.
The corresponding normal instructions may be defined as 1 namely high level, and the protection instruction may be defined as 0 namely namely low level.Example
Such as, when detecting has noise in measured signal, described instruction pulse sends 1 namely high level, passes through the OR circuit
303, the logical relation by OR circuit 303 is available: no matter the comparison module 10 export be abnormal signal or
Normal signal, what the processing module 30 exported will be high level namely normal instructions, at this point, not having to turn off the electronics
Device.When detecting noiseless in measured signal, described instruction pulse sends 0 namely low level, at this point, if the relatively mould
What block 10 exported is abnormal signal, and the processing module 30 can export low level, namely protection instruction, turns off the electronics device
Part；If what the comparison module 10 exported is normal signal, the processing module 30 can export high level namely normal instructions,
At this point, not having to turn off the electronic device.
Optionally, as shown in figure 4, the signal synthesis circuit includes AND gate circuit 304.The two of the AND gate circuit 304
A input terminal is separately connected the output end and the noise masking signal generation module 20 of the comparison module 10, described and door
The output end of circuit 304 is used as described instruction end 40.
Accordingly, the abnormal signal is defined as 1 namely high level, and the normal signal is defined as 0 namely low level, if
When the measured signal exceeds the threshold range, the comparison module 10 can export high level according to setting, when described to be measured
When signal is without departing from the threshold range, the comparison module 10 can export low level according to setting.Described instruction pulse can
It is effective to be defined as low level, namely detects in measured signal that described instruction pulse sends 0 namely low level when having noise.It is right
The normal instructions answered may be defined as 0 namely low level, and the protection instruction may be defined as 1 namely namely high level.For example,
When detecting has noise in measured signal, described instruction pulse sends 0 namely low level, by the AND gate circuit 304, leads to
The logical relation for crossing AND gate circuit 304 is available: what no matter the comparison module 10 exported is abnormal signal or normal letter
Number, what the processing module 30 exported will be low level namely normal instructions, at this point, not having to turn off the electronic device.When
When detecting noiseless in measured signal, described instruction pulse sends 1 namely high level, at this point, if the comparison module 10 is defeated
Out be abnormal signal, the processing module 30 can export high level, namely protection instruction, turn off the electronic device；If institute
State the output of comparison module 10 is normal signal, and the processing module 30 can export low level namely normal instructions, at this point, not
With the shutdown electronic device.
Optionally, as shown in figure 5, the signal synthesis circuit may include second resistance 305 and triode 306.It is described
The input terminal of second resistance 305 connects the output end of the comparison module 10, makes an uproar described in the input terminal connection of the triode 306
Acoustic shielding signal generator module 20, the output end of the second resistance 305 and the output end of the triode 306 are connected in parallel
And it is used as described instruction end 40.In embodiments of the present invention, the output of the comparison module 10 terminates a second resistance 305,
However, it is possible to do not have to connect second resistance 305, for example, when the comparison module 10 is the comparator of open-drain type output, noise screen
Cover signal generator module 20 issue low level represent described instruction pulse, at this point, the output of the comparison module 10 there is no need to
Second resistance 305 is connect again.
Accordingly, the abnormal signal is defined as 1 namely high level, and the normal signal is defined as 0 namely low level, if
When the measured signal exceeds the threshold range, the comparison module 10 can export high level according to setting, when described to be measured
When signal is without departing from the threshold range, the comparison module 10 can export low level according to setting.Described instruction pulse can
It is effective to be defined as low level, namely detects in measured signal that described instruction pulse sends 0 namely low level when having noise.It is right
The normal instructions answered may be defined as 0 namely low level, and the protection instruction may be defined as 1 namely namely high level.For example,
When detecting has noise in measured signal, described instruction pulse sends 0 namely low level, by the AND gate circuit 304, leads to
The working principle for crossing triode 306 is available: what no matter the comparison module 10 exported is abnormal signal or normal signal,
What the processing module 30 exported will be low level namely normal instructions, at this point, not having to turn off the electronic device.Work as inspection
When measuring noiseless in measured signal, described instruction pulse sends 1 namely high level, at this point, if the comparison module 10 exports
Be abnormal signal, the processing module 30 can export high level, namely protection instruction, turn off the electronic device；If described
What comparison module 10 exported is normal signal, and the processing module 30 can export low level namely normal instructions, at this point, not having to
Turn off the electronic device.
It should be noted that can be in the electronic device when being switched on or off, the noise masking signal generation module
20 issue command pulse, because at the time of for example power tube is switched on or off electronic device, due to the Reverse recovery of power tube
Characteristic, the characteristic of parasitic capacitance, can generate very big current spike, this current spike is exactly noise.Certainly, it is not limited to
The only just sending command pulse when electronic device is switched on or off, it is other can generate noise in the state of all capable of emitting instruction arteries and veins
Punching.
Further, the noise masking signal generation module 20 can be arranged in a chip, the chip can be used for
Adjust the pulse width of described instruction pulse.Such as have a MCU in the circuit where the electronic device, it is fixed to can use it
When device TIM1 CH1 and CH1N PWM wave is issued to control electronic device open shutdown, and take the CH4 of TIM1 to realize noise
The generation of shielded signal namely command pulse.Doing so very convenient can realize synchronous requirement, while described instruction pulse
Pulsewidth width be also very easy to adjust so that the shielding time is adjustable, can for different electronic devices or application into
Row change.
In embodiments of the present invention, the comparison module 10 has used comparator, it should be noted that in addition to comparator, also
Can be used operational amplifier or the device with comparator or or the device with operational amplifier, herein with no restrictions.
In conclusion the present invention proposes a kind of protection circuit, including comparison module, noise masking signal generation module and
Processing module.Two input terminals of processing module are separately connected comparison module and noise masking signal generation module.The ratio
Compared with the size relation that module is used to judge the measured signal and a threshold value, if the measured signal is not in the range of the threshold value
It is interior, then output abnormality signal, if the measured signal exports normal signal in the threshold range.The noise shielding
Signal generator module is for judging that the measured signal whether there is noise signal, and there are noise signals in the measured signal
When issue command pulse；The processing module, if there is the abnormal signal, judges for judging whether there is the abnormal signal
Whether there is the command pulse, if there is the command pulse, shields the output of the comparison module 10, described instruction end issues
The normal instructions, if described instruction end issues the protection instruction without described instruction pulse；If without the abnormal signal, institute
It states command end and issues normal instructions.Protection circuit proposed by the present invention by noise masking signal generation module can effectively shield by
It is switched on or off the current or voltage spike of moment generation in electronic device, and does not need to increase RC filtering, will not be given to be measured
Signal brings delay, ensure that the real-time of protection circuit.
Further, processing module can be ultralow by diode, resistance or NOT gate or with door or triode etc.
The device of cost is realized, and noise masking signal generation module is generally realized using the module of circuit main control chip, without
Carry out additional devices.Therefore cost is relatively low, effectively reduces the cost of hardware.
Further, it using the module of main control chip as noise masking signal generation module, can very simply adjust
The pulse width of whole command pulse, therefore the shielding time is adjustable, is adapted to different application scene.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example " or " specifically show
The description of example " etc. means that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained in the present invention
At least one embodiment or example in.In the present specification, schematic expression of the above terms are necessarily directed to phase
Same embodiment or example.And particular features, structures, materials, or characteristics described can be real in any one or more
Applying in example can be combined in any suitable manner.In addition, those skilled in the art can be by different embodiments described in this specification
Or example is engaged and is combined.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (10)
1. a kind of protection circuit is used for an electronic device, which is characterized in that generate mould including comparison module, noise masking signal
Block and processing module, the real-time current or voltage for flowing through the electronic device are measured signal；
The input terminal of the comparison module connects the measured signal, and the output end of the comparison module connects the processing module
Input terminal, the comparison module is used to judge the size relation of the measured signal and a threshold value, if the measured signal is not
In the range of the threshold value, then output abnormality signal, if the measured signal in the threshold range, exports normal letter
Number；
The noise masking signal generation module connects the input terminal of the processing module, the noise masking signal generation module
For in the measured signal, there are issue command pulse when noise signal；
The output end of the processing module issues institute for issuing normal instructions or protection instruction, described instruction end as command end
When stating normal instructions, the electronic device is not turned off and turns off the electronics device when described instruction end issues protection instruction
Part；
The processing module is for judging whether there is the abnormal signal；
If there is the abnormal signal, described instruction pulse is judged whether there is；If there is the command pulse, the comparison is shielded
The output of module, described instruction end issue the normal instructions, if described instruction end issues the protection without described instruction pulse
Instruction；
If described instruction end issues normal instructions without the abnormal signal.
2. a kind of protection circuit as described in claim 1, which is characterized in that the processing module includes signal synthesis electricity
Road, the output end of the signal synthesis circuit is as described instruction end.
3. a kind of protection circuit as claimed in claim 2, which is characterized in that the signal synthesis circuit includes diode；
The input terminal of the diode connects the noise masking signal generation module, the output end of the comparison module with it is described
The output end of diode connects and is used as described instruction end.
4. a kind of protection circuit as claimed in claim 2, which is characterized in that the signal synthesis circuit includes OR circuit；
Two input terminals of the OR circuit are separately connected the output end and the noise masking signal of the comparison module
The output end of generation module, the OR circuit is used as described instruction end.
5. a kind of protection circuit as claimed in claim 2, which is characterized in that the signal synthesis circuit includes AND gate circuit；
Two input terminals of the AND gate circuit are separately connected the output end and the noise masking signal of the comparison module
The output end of generation module, the AND gate circuit is used as described instruction end.
6. a kind of protection circuit as claimed in claim 2, which is characterized in that the signal synthesis circuit includes triode；
The input terminal of the triode connects the noise masking signal generation module, the output end of the comparison module with it is described
The output end of triode connects and is used as described instruction end.
7. a kind of protection circuit as described in claim 1, which is characterized in that the electronic device is when being switched on or off, institute
It states noise masking signal generation module and issues command pulse.
8. a kind of protection circuit as claimed in claim 7, which is characterized in that the noise masking signal generation module setting exists
In one chip, the chip is used to adjust the pulse width of described instruction pulse.
9. a kind of protection circuit as claimed in claim 7, which is characterized in that the chip is also used to control the electronic device
On-off.
10. a kind of protection circuit as described in claim 1, which is characterized in that the comparison module includes that comparator, operation are put
Big device, the device with comparator or the device with operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910578861.0A CN110265960A (en) | 2019-06-28 | 2019-06-28 | A kind of protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910578861.0A CN110265960A (en) | 2019-06-28 | 2019-06-28 | A kind of protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110265960A true CN110265960A (en) | 2019-09-20 |
Family
ID=67923119
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910578861.0A Pending CN110265960A (en) | 2019-06-28 | 2019-06-28 | A kind of protection circuit |
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| CN (1) | CN110265960A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200444U (en) * | 1985-04-01 | 1985-11-10 | 核工业部电机运行技术开发公司 | Relay compound type apparatus for protecting pull-out of synchronous motor |
| CN1722561A (en) * | 2004-07-05 | 2006-01-18 | 精工电子有限公司 | Battery protection circuit |
| CN102088183A (en) * | 2009-12-03 | 2011-06-08 | 晶洋微电子股份有限公司 | Protection circuit with locking control function |
| CN202261017U (en) * | 2011-10-18 | 2012-05-30 | 甘肃省电力公司白银供电公司 | Switch power supply special for relay protection |
| CN103259245A (en) * | 2012-02-17 | 2013-08-21 | 台达电子工业股份有限公司 | Protective circuit and protective method of electronic device |
-
2019
- 2019-06-28 CN CN201910578861.0A patent/CN110265960A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200444U (en) * | 1985-04-01 | 1985-11-10 | 核工业部电机运行技术开发公司 | Relay compound type apparatus for protecting pull-out of synchronous motor |
| CN1722561A (en) * | 2004-07-05 | 2006-01-18 | 精工电子有限公司 | Battery protection circuit |
| CN102088183A (en) * | 2009-12-03 | 2011-06-08 | 晶洋微电子股份有限公司 | Protection circuit with locking control function |
| CN202261017U (en) * | 2011-10-18 | 2012-05-30 | 甘肃省电力公司白银供电公司 | Switch power supply special for relay protection |
| CN103259245A (en) * | 2012-02-17 | 2013-08-21 | 台达电子工业股份有限公司 | Protective circuit and protective method of electronic device |
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Application publication date: 20190920 |
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