CN105429097B - The identification of fire-fighting power supply bus short circuit and protection circuit - Google Patents
The identification of fire-fighting power supply bus short circuit and protection circuit Download PDFInfo
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- CN105429097B CN105429097B CN201511018663.7A CN201511018663A CN105429097B CN 105429097 B CN105429097 B CN 105429097B CN 201511018663 A CN201511018663 A CN 201511018663A CN 105429097 B CN105429097 B CN 105429097B
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- monostable
- power supply
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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
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application discloses the identification of fire-fighting power supply bus short circuit and protection circuit, including power supply input circuit, adjustment pipe, current sampling circuit, power output circuit, comparator, decision circuitry, power-up time delay circuit, monostable circuit, delay circuit, short-circuit condition output circuit and electrical isolation output circuit.Power supply input circuit connection adjustment pipe, adjustment pipe connect current sampling circuit, and current sampling circuit is separately connected power output circuit and comparator, and power-up time delay circuit connects the first input end of monostable circuit；The first input end of first output end connection judgment circuit of comparator；The second output terminal of comparator connects delay circuit；Second input terminal of the first output end connection monostable circuit of delay circuit；Second input terminal of the output end connection judgment circuit of monostable circuit；The output end connection adjustment pipe of decision circuitry；The second output terminal of delay circuit connects short-circuit condition output circuit；Short-circuit condition output circuit connects electrical isolation output circuit.
Description
Technical field
The application relates to circuit applied technical field, specifically, being related to a kind of identification of fire-fighting power supply bus short circuit and protection
Circuit.
Background technique
Security against fire is to be related to the major issue of people's property and safety, and building, factory and commercial building are mounted with that fire-fighting is pacified
Full monitoring system, if the utility power of fire-fighting class, which goes wrong, cannot find in time or can not protect and often damage
Words, will paralyse completely without the fire-fighting system of power supply.
Inside modern architecture, fire protection warning, fire prevention, fire extinguishing system are many kinds of, and each corner being distributed in building.
These factors such as ageing equipment, power failure can all cause the operating interruptions of fire-fighting system, however this will certainly delay fire
Discovery and control, thus cause tragedy be commonplace.Therefore, for the power-supply system in fire-fighting system can effectively into
Row short circuit identification with protection very it is necessary to, while to ensure safety of life and property also function to positive effect.
Currently, for fire-fighting power supply overcurrent protection circuit there are three types of: current-limiting type, foldback circuit formula and shutdown formula.Current limliting
For the basic composition of formula circuit referring to Fig. 3, the shortcomings that such circuit is that circuit power consumption is big, calorific value is high, cannot be applied in high current
In circuit.The shortcomings that the basic of foldback circuit formula circuit is constituted referring to fig. 4, such circuit is the circuit when short circuit occurs for output
In can flow through a lesser short circuit current, but after short circuit is cancelled, behind when being connected to capacity load, circuit may be sent out
Raw locking.It is any in the moment performance circuit of large inrush current that is powered, may all circuit be made to become lock state.Shutdown formula electricity
The basic composition on road is referring to Fig. 5, the disadvantage is that cannot be connected to capacitive load below.
Summary of the invention
In view of this, the technical problem to be solved by the application is to provide a kind of identification of fire-fighting power supply bus short circuit and protecting
Protection circuit, the output of the circuit can connect capacitive load, low in energy consumption, calorific value is low, strong antijamming capability.
In order to solve the above-mentioned technical problem, the application has following technical solution:
A kind of identification of fire-fighting power supply bus short circuit and protection circuit, including power supply input circuit, adjustment pipe, current sample electricity
Road, power output circuit and comparator, the power supply input circuit are connected to the adjustment pipe, and the adjustment pipe is connected to described
Current sampling circuit, the current sampling circuit are connected respectively to the power output circuit and the comparator, and feature exists
In,
The fire-fighting power supply bus short circuit identification and protection circuit further include decision circuitry, power-up time delay circuit, monostable electricity
Road, delay circuit, short-circuit condition output circuit and electrical isolation output circuit,
The power-up time delay circuit is connected to the first input end of the monostable circuit, for controlling the monostable circuit
Work；
First output end of the comparator is connected to the first input end of the decision circuitry, for being the judgement electricity
Road, which provides, judges benchmark；The second output terminal of the comparator is connected to the delay circuit, for controlling the delay circuit
Work；
First output end of the delay circuit is connected to the second input terminal of the monostable circuit, for triggering the list
Equalizing network；The output end of the monostable circuit is connected to the second input terminal of the decision circuitry, for being the decision circuitry
Offer judges benchmark；
The output end of the decision circuitry is connected to the adjustment pipe, for controlling the working condition of the adjustment pipe；
The second output terminal of the delay circuit is connected to the short-circuit condition output circuit, for providing certain time
Signal debounce, and it is capable of providing the state of current power bus；
The short-circuit condition output circuit is connected to the electrical isolation output circuit, for providing isolation electrically.
Preferably, in which:
The power-up time delay circuit is connected to the first input end of the monostable circuit, for controlling the monostable circuit
Work；Further are as follows:
The power-up time delay circuit is connected to the first input end of the monostable circuit, in the fire-fighting power supply bus
When short circuit identification is powered on protection circuit, in the delay time of the delay circuit, the monostable circuit is forbidden to work.
Preferably, in which:
First output end of the comparator is connected to the first input end of the decision circuitry, for being the judgement electricity
Road, which provides, judges benchmark；Further are as follows:
First output end of the comparator is connected to the first input end of the decision circuitry, in the fire-fighting electricity
Any moment of source bus short circuit identification and protection circuit, the sample rate current that the current sample is provided and circuit are maximum normal
Operating current is compared, if sample rate current is greater than circuit maximum running current, the comparator is to the decision circuitry
Export the first determining reference value；If sample rate current is less than circuit maximum running current, the comparator is electric to the judgement
Road exports the second determining reference value.
Preferably, in which:
The second output terminal of the comparator is connected to the delay circuit, for controlling the work of the delay circuit；
Further are as follows:
The second output terminal of the comparator is connected to the delay circuit, for knowing in the fire-fighting power supply bus short circuit
Not with any moment of protection circuit, the sample rate current that the current sampling circuit is provided and circuit maximum running current
It is compared, when sample rate current is greater than circuit maximum running current, triggers the list for controlling the delay circuit
Equalizing network works alternatively the monostable circuit in stable state and transient state.
Preferably, in which:
First output end of the delay circuit is connected to the second input terminal of the monostable circuit, for triggering the list
Equalizing network；Further are as follows:
First output end of the delay circuit is connected to the second input terminal of the monostable circuit, for working as the comparison
After the second output terminal output of device triggers the delay circuit, it is delayed after the delay time of the delay circuit, triggers the list
Equalizing network.
Preferably, in which:
The output end of the monostable circuit is connected to the second input terminal of the decision circuitry, for being the decision circuitry
Offer judges benchmark, further are as follows:
The output end of the monostable circuit is connected to the second input terminal of the decision circuitry, in the fire-fighting power supply
After the completion of bus short circuit identification is powered on protection circuit, when sample rate current is greater than circuit maximum running current, to described
Decision circuitry exports the first determining reference value, when sample rate current is less than circuit maximum running current, to the judgement electricity
Road exports the second determining reference value.
Preferably, in which:
The output end of the decision circuitry is connected to the adjustment pipe, for controlling the working condition of the adjustment pipe；Into
One step are as follows:
The output end of the decision circuitry is connected to adjustment pipe, for receiving the comparator or described monostable
When the first determining reference value of circuit output, the adjustment pipe shutdown is controlled；And for receiving the comparator or described
When the second determining reference value of monostable circuit output, the adjustment pipe conducting is controlled.
Preferably, in which:
The monostable circuit is 555 timer circuits.
Preferably, in which:
The electrical isolation output circuit is photoelectric coupling output circuit.
Compared with prior art, method described herein achieving the following effects:
First, fire-fighting power supply bus short circuit identification provided herein and protection circuit, output can connect capacitive and bear
It carries, when the moment that load powers on generating very big dash current, which introduces power-up time delay circuit to forbid monostable circuit
Operating current effectively can be controlled maximum no more than circuit by shutdown adjustment pipe to make circuit work in limited current state
Running current, so that it is guaranteed that the normal work of the identification of fire-fighting power supply bus short circuit and protection circuit.
Second, fire-fighting power supply bus short circuit identification provided herein is low with protection circuit power consumption.Traditional circuit can only
It always works under the operating mode of current limliting, supply voltage is almost added in adjustment pipe both ends entirely, and the voltage at adjustment pipe both ends is multiplied by
Electric current when current limliting, the maximum power that the entire power channel that dissipated can be provided, so extremely consuming energy.And it is provided herein
Fire-fighting power supply bus short circuit identification with protection circuit, circuit in the case where output short-circuit, i.e., when sample rate current be greater than circuit
When maximum running current, can periodically it be turned off by introducing monostable circuit control adjustment pipe, therefore more during short circuit
Adjustment pipe is in the number time almost without energy consumption, therefore the average power consumption of entire circuit can be very low.
Third, since fire-fighting power supply bus short circuit identification provided herein is low with protection circuit power consumption, thus entirely
The calorific value of circuit is low, without using big radiator, therefore the programmable very little of volume of the circuit, and the at low cost, longevity
Life length, high reliablity.
4th, fire-fighting power supply bus short circuit identification provided herein is realized with protection circuit using photoelectric coupled device
Isolation output, so that the anti-interference ability of entire circuit becomes strong, when false wiring or short circuit occurs in outside, this circuit will not
It burns, does not influence the function of other power paths.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of the identification of fire-fighting power supply bus short circuit and protection circuit of the invention；
Fig. 2 is a kind of implementation diagram of the identification of fire-fighting power supply bus short circuit and protection circuit of the invention；
Fig. 3 is the structural schematic diagram of current-limiting type current foldback circuit in the prior art；
Fig. 4 is the structural schematic diagram of foldback circuit formula current foldback circuit in the prior art；
Fig. 5 is the structural schematic diagram for turning off formula current foldback circuit in the prior art.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer within the acceptable error range, those skilled in the art can within a certain error range solve described in
Technical problem basically reaches the technical effect.In addition, " coupling " word includes any direct and indirect electric property coupling herein
Means.Therefore, if it is described herein that a first device is coupled to a second device, then representing the first device can directly electrical coupling
It is connected to the second device, or the second device indirectly electrically coupled through other devices or coupling means.Specification
Subsequent descriptions be implement the application better embodiment, so it is described description be for the purpose of the rule for illustrating the application,
It is not intended to limit the scope of the present application.The protection scope of the application is as defined by the appended claims.
Embodiment 1
Shown in Figure 1 is the specific implementation of the herein described a kind of identification of fire-fighting power supply bus short circuit and protection circuit
Example, the circuit include power supply input circuit 10, adjustment pipe 11, current sampling circuit 12, power output circuit 13, comparator 14,
Decision circuitry 15, power-up time delay circuit 16, monostable circuit 17, delay circuit 18, short-circuit condition output circuit 19 and electrical isolation
Output circuit 20.
Power supply input circuit 10 is connected to adjustment pipe 11, and adjustment pipe 11 is connected to current sampling circuit 12, current sample electricity
Road 12 is connected respectively to power output circuit 13 and comparator 14.
The power-up time delay circuit 16 is connected to the first input end of the monostable circuit 17, in the fire-fighting power supply
When bus short circuit identification is powered on protection circuit, within the time of delay, the monostable circuit 17 is forbidden to work.
First output end of the comparator 14 is connected to the first input end of the decision circuitry 15, for disappearing described
At any moment of anti-power bus short circuit identification and protection circuit, the sample rate current that current sampling circuit 12 is provided and circuit are most
Big running current is compared, if sample rate current is greater than circuit maximum running current, the comparator 14 is to described
Decision circuitry 15 exports the first determining reference value；If sample rate current is less than circuit maximum running current, the comparator 14
The second determining reference value is exported to the decision circuitry 15.
The second output terminal of the comparator 14 is connected to the delay circuit 18, for short in the fire-fighting power supply bus
At any moment of road identification and protection circuit, sample rate current is compared with circuit maximum running current, in sampling electricity
When stream is greater than circuit maximum running current, the monostable circuit 17 is triggered for controlling the delay circuit 18, is made described
Monostable circuit 17 is worked alternatively in stable state and transient state.
First output end of the delay circuit 18 is connected to the second input terminal of the monostable circuit 17, compares for working as
It after the output of 14 second output terminal of device triggers the delay circuit 18, is delayed after the delay time of the delay circuit 18, triggers institute
State monostable circuit 17.
The output end of the monostable circuit 17 is connected to the second input terminal of the decision circuitry 15, in the fire-fighting
After the completion of power bus short circuit identification is powered on protection circuit, when sample rate current is greater than circuit maximum running current, to
The decision circuitry 15 exports the first determining reference value, single at this time when sample rate current is less than circuit maximum running current
Equalizing network is not triggered, and output does not change, and exports the second determining reference value to the decision circuitry 15.
The output end of the decision circuitry 15 is connected to the adjustment pipe 11, for receiving the comparator 14 or institute
When stating the first determining reference value of the output of monostable circuit 17, controls the adjustment pipe 11 and turn off；And for receiving the ratio
When compared with device 14 or the second determining reference value of the output of the monostable circuit 17, controls the adjustment pipe 11 and be connected.
Above-mentioned first determining reference value can be set as high level, and the second determining reference value can be set as low level.
The second output terminal of the delay circuit 18 is connected to the short-circuit condition output circuit 19, for providing a timing
Between signal debounce function, it is further provided the state of current power bus, to provide state for other circuits or single-chip microcontroller
Instruction, so as to further alerted or other processing.
The short-circuit condition output circuit 19 is connected to the electrical isolation output circuit, for provide electrically every
From, wrong line or the external damage that other power bus circuits of safety accident and whole device are caused with forceful electric power short circuit are prevented,
So that failure is limited to the smallest range, keep the work of whole system relatively reliable, and the anti-interference of entire circuit can be promoted
Energy.
In general, the load majority on power bus is capacitive load, for example, DC/DC circuit input terminal can all have it is one big
Capacitor, when doing power supply using linear voltage regulator also can the input terminal of power circuit add a large bulk capacitance be used as energy storage and
Filtering.In the moment that load powers on, a very big dash current is had.Fire-fighting power supply bus short circuit provided by the present invention is known
Not with protection circuit, output can connect capacitive load, when the moment that load powers on generating very big dash current, the circuit
Forbid the shutdown adjustment pipe 11 of monostable circuit 17 by introducing power-up time delay circuit, so that entire circuit works in limited current state,
So as to effectively control no more than circuit maximum running current by operating current, so that it is guaranteed that fire-fighting power supply bus
The normal work of short circuit identification and protection circuit.When the load of circuit of the present invention is capacitive, due to power-up time delay circuit 16, list
The collective effect of equalizing network 17 and decision circuitry 15, adjustment pipe 11 becomes on state from off state, so that circuit can lead to
Comparator 14, decision circuitry 15 and the adjustment work of pipe 11 are crossed in limited current state to capacitor charging.
MOSFET can be used in adjustment pipe 11 in the present invention or other kinds of switching device is realized.Invention increases
The function of MOSFET is turned off, in the case where output short-circuit, by the introducing of delay circuit 18 and monostable circuit 17, MOSFET is big
What part-time was off, so MOSFET this period is almost without power consumption, during short circuit, the average power consumption of entire circuit
It can be very low.And traditional circuit can only always work under the operating mode of current limliting, supply voltage is almost added in the both ends MOSFET entirely,
The voltage at both ends is multiplied by electric current when current limliting, the maximum power dissipation that the entire power channel that dissipated can be provided, so extremely consume energy,
Therefore, fire-fighting power supply bus short circuit identification provided by the present invention efficiently solves power consumption existing for traditional circuit with protection circuit
High problem.
Due to the output of monostable circuit and comparator in the present invention be or relationship, when overcurrent occurs, if without list
Equalizing network, circuit work introduce monostable circuit in limited current state, can be by the change using comparator output state, by prolonging
When circuit a period of time delay (in delay time circuit work in limited current state), when triggering monostable circuit being gone to enter one section
Between transient state (monostable circuit output high level), with comparator output phase or, so just have turned off MOSFET (high level input close
It is disconnected), when monostable circuit returns to stable state, only remains current-limiting circuit and work, just as there is no monostable circuit.Therefore, it introduces monostable
Circuit can periodically turn off MOSFET.It is capacitive load since load is most of, even if output does not have when entire circuit powers on
Short circuit occurs, powers in a flash, overcurrent can also occur, if at this moment monostable circuit removes shutdown adjustment pipe, it is clear that load circuit
It cannot normally work on power, be in the state of on-off always, so that subsequent load can not work normally, so this hair
It is bright by allowed when powering on the work of entire circuit limited current state for a period of time, to miss dash current when powering on.(capacitive
It loads after thering is dash current, capacitor to be full of when powering on regard to only one operating current).
Fire-fighting power supply bus short circuit identification of the present invention is preferably photoelectricity with the electrical isolation output circuit 20 in protection circuit
Couple output circuit.Isolation output is realized using photoelectric coupled device, and the anti-interference ability of entire circuit is enabled to become strong, when
When false wiring or short circuit occurs in outside, circuit of the invention will not be burnt, and not influence the function of other power paths.
Further, monostable circuit 17 of the invention is 555 timer circuits.
Embodiment 2
A kind of Application Example of the invention presented below, referring to fig. 2.
When fire-fighting power supply bus short circuit identification of the present invention is powered on protection circuit, power-up time delay circuit forbids monostable circuit work
Make, electric current flows through adjustment pipe, and by current sample, sample rate current and a reference value are compared by comparator, when load current is big
When maximum running current (as short circuit), comparator to decision circuitry (in Fig. 2 by or door in the form of embody) output
High level so that decision circuitry (or door) exports high level and will adjust pipe shutdown, and then reduces the electric current of entire circuit；Work as load
When electric current is less than maximum running current, comparator is by exporting low level to decision circuitry (or door), so that decision circuitry
Control adjustment pipe is fully on, and entire circuit work is in limited current state.
After the completion of fire-fighting power supply bus short circuit identification of the present invention is powered on protection circuit, power-up time delay circuit no longer forbids list
Equalizing network work.When load current is greater than maximum running current, sample rate current compares after the comparison of comparator effect
Device output triggers monostable circuit work after delay circuit is delayed, and the output of comparator and the output of monostable circuit are to decision circuitry
By mutually or relationship control adjustment pipe shutdown, after certain transient state time, monostable circuit is restored to stable state, entire electricity
It reworks in limited current state on road.After the delay time of delay circuit, monostable circuit is triggered again, adjustment pipe shutdown,
So in cycles, until load current is less than or equal to circuit maximum running current.
As can be seen from the above embodiments beneficial effect existing for the application is:
First, fire-fighting power supply bus short circuit identification provided herein and protection circuit, output can connect capacitive and bear
It carries, when the moment that load powers on generating very big dash current, which introduces power-up time delay circuit to forbid monostable circuit
Shutdown adjustment pipe, by the work of entire circuit in limited current state, so as to effectively control no more than electricity by operating current
Road maximum running current, so that it is guaranteed that the normal work of the identification of fire-fighting power supply bus short circuit and protection circuit.
Second, fire-fighting power supply bus short circuit identification provided herein is low with protection circuit power consumption.Traditional circuit can only
It always works under the operating mode of current limliting, supply voltage is almost added in adjustment pipe both ends entirely, and the voltage at adjustment pipe both ends is multiplied by
Electric current when current limliting, the maximum power that the entire power channel that dissipated can be provided, so extremely consuming energy.And it is provided herein
Fire-fighting power supply bus short circuit identification with protection circuit, circuit in the case where output short-circuit, i.e., when sample rate current be greater than circuit
When maximum running current, can periodically it be turned off by introducing monostable circuit control adjustment pipe, therefore more during short circuit
Adjustment pipe is in the number time almost without energy consumption, therefore the average power consumption of entire circuit can be very low.
Third, since fire-fighting power supply bus short circuit identification provided herein is low with protection circuit power consumption, thus entirely
The calorific value of circuit is low, without using big radiator, therefore the programmable very little of volume of the circuit, and the at low cost, longevity
Life length, high reliablity.
4th, fire-fighting power supply bus short circuit identification provided herein is realized with protection circuit using photoelectric coupled device
Isolation output, so that the anti-interference ability of entire circuit becomes strong, when false wiring or short circuit occurs in outside, this circuit will not
It burns, does not influence the function of other power paths.
It should be understood by those skilled in the art that, embodiments herein can provide as method, apparatus or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
Above description shows and describes several preferred embodiments of the present application, but as previously described, it should be understood that the application
Be not limited to forms disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations,
Modification and environment, and the above teachings or related fields of technology or knowledge can be passed through within that scope of the inventive concept describe herein
It is modified.And changes and modifications made by those skilled in the art do not depart from spirit and scope, then it all should be in this Shen
It please be in the protection scope of appended claims.
Claims (9)
1. a kind of fire-fighting power supply bus short circuit identification and protection circuit, including power supply input circuit, adjustment pipe, current sample electricity
Road, power output circuit and comparator, the power supply input circuit are connected to the adjustment pipe, and the adjustment pipe is connected to described
Current sampling circuit, the current sampling circuit are connected respectively to the power output circuit and the comparator, and feature exists
In,
The fire-fighting power supply bus short circuit identification further includes decision circuitry, power-up time delay circuit, monostable circuit, prolongs with protection circuit
When circuit, short-circuit condition output circuit and electrical isolation output circuit,
The power-up time delay circuit is connected to the first input end of the monostable circuit, for controlling the work of the monostable circuit
Make；
First output end of the comparator is connected to the first input end of the decision circuitry, for mentioning for the decision circuitry
For judging benchmark；The second output terminal of the comparator is connected to the delay circuit, for controlling the work of the delay circuit
Make；
First output end of the delay circuit is connected to the second input terminal of the monostable circuit, for triggering the monostable electricity
Road；The output end of the monostable circuit is connected to the second input terminal of the decision circuitry, for providing for the decision circuitry
Judge benchmark；
The output end of the decision circuitry is connected to the adjustment pipe, for controlling the working condition of the adjustment pipe；
The second output terminal of the delay circuit is connected to the short-circuit condition output circuit, for providing the signal of certain time
Debounce, and it is capable of providing the state of current power bus；
The short-circuit condition output circuit is connected to the electrical isolation output circuit, for providing isolation electrically.
2. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 1, which is characterized in that
The power-up time delay circuit is connected to the first input end of the monostable circuit, for controlling the work of the monostable circuit
Make；Further are as follows:
The power-up time delay circuit is connected to the first input end of the monostable circuit, in the fire-fighting power supply bus short circuit
When identification is powered on protection circuit, in the delay time of the delay circuit, the monostable circuit is forbidden to work.
3. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 1, which is characterized in that
First output end of the comparator is connected to the first input end of the decision circuitry, for mentioning for the decision circuitry
For judging benchmark；Further are as follows:
First output end of the comparator is connected to the first input end of the decision circuitry, for total in the fire-fighting power supply
Any moment of line short circuit identification and protection circuit, the sample rate current that the current sampling circuit is provided and circuit are maximum normal
Operating current is compared, if sample rate current is greater than circuit maximum running current, the comparator is to the decision circuitry
Export the first determining reference value；If sample rate current is less than circuit maximum running current, the comparator is electric to the judgement
Road exports the second determining reference value.
4. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 1, which is characterized in that
The second output terminal of the comparator is connected to the delay circuit, for controlling the work of the delay circuit；Into one
Step are as follows:
The second output terminal of the comparator is connected to the delay circuit, for the fire-fighting power supply bus short circuit identification with
Any moment of circuit is protected, the sample rate current that the current sampling circuit is provided and circuit maximum running current carry out
Compare, when sample rate current is greater than circuit maximum running current, triggers the monostable electricity for controlling the delay circuit
Road works alternatively the monostable circuit in stable state and transient state.
5. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 1, which is characterized in that
First output end of the delay circuit is connected to the second input terminal of the monostable circuit, for triggering the monostable electricity
Road；Further are as follows:
First output end of the delay circuit is connected to the second input terminal of the monostable circuit, for when the comparator
It after second output terminal output triggers the delay circuit, is delayed after the delay time of the delay circuit, triggers the monostable electricity
Road.
6. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 1, which is characterized in that
The output end of the monostable circuit is connected to the second input terminal of the decision circuitry, for providing for the decision circuitry
Judge benchmark, further are as follows:
The output end of the monostable circuit is connected to the second input terminal of the decision circuitry, in the fire-fighting power supply bus
After the completion of short circuit identification is powered on protection circuit, when sample rate current is greater than circuit maximum running current, to the judgement
The first determining reference value of circuit output, it is defeated to the decision circuitry when sample rate current is less than circuit maximum running current
Second determining reference value out.
7. according to the fire-fighting power supply bus short circuit identification of claim 3 or 6 and protection circuit, which is characterized in that
The output end of the decision circuitry is connected to the adjustment pipe, for controlling the working condition of the adjustment pipe；Further
Are as follows:
The output end of the decision circuitry is connected to the adjustment pipe, for receiving the comparator or the monostable circuit
When the first determining reference value of output, the adjustment pipe shutdown is controlled；And for receiving the comparator or described monostable
When the second determining reference value of circuit output, the adjustment pipe conducting is controlled.
8. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 7, which is characterized in that
The monostable circuit is 555 timer circuits.
9. the identification of fire-fighting power supply bus short circuit and protection circuit according to claim 7, which is characterized in that
The electrical isolation output circuit is photoelectric coupling output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511018663.7A CN105429097B (en) | 2015-12-30 | 2015-12-30 | The identification of fire-fighting power supply bus short circuit and protection circuit |
Applications Claiming Priority (1)
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| CN201511018663.7A CN105429097B (en) | 2015-12-30 | 2015-12-30 | The identification of fire-fighting power supply bus short circuit and protection circuit |
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| CN105870899B (en) * | 2016-06-07 | 2018-10-26 | 外商独资江苏领先电子有限公司 | Protect circuit |
| CN110581530A (en) * | 2019-09-16 | 2019-12-17 | 无锡江南计算技术研究所 | Power bus protection circuit based on intelligent fuse |
| CN113852043A (en) * | 2021-11-10 | 2021-12-28 | 深圳达人高科电子有限公司 | Short-circuit protection circuit |
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| CN205453080U (en) * | 2015-12-30 | 2016-08-10 | 北京易艾斯德科技有限公司 | Short circuit discernment of firefighting power supply bus and protection circuit |
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| DE60329261D1 (en) * | 2002-10-15 | 2009-10-29 | Vincotech Holdings S A R L | Input bypass current and / or output short-circuit current control in the boost converter of a power supply |
| CN100361360C (en) * | 2005-08-12 | 2008-01-09 | 刘树林 | Switch supply source cut-off type output short-circuit protector |
| CN102571053B (en) * | 2012-01-16 | 2014-01-29 | 南京航空航天大学 | Control method for alternate current solid power switch and switch device |
| CN104167711B (en) * | 2014-09-02 | 2018-02-02 | 航天长峰朝阳电源有限公司 | The delay locked protection device of self-replaced type |
| CN204886147U (en) * | 2015-08-31 | 2015-12-16 | 国网河南省电力公司电力科学研究院 | Adjustable intermittence time's current foldback circuit |
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