CN108493902B - A kind of self-protection circuit and system - Google Patents
A kind of self-protection circuit and system Download PDFInfo
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- CN108493902B CN108493902B CN201810332281.9A CN201810332281A CN108493902B CN 108493902 B CN108493902 B CN 108493902B CN 201810332281 A CN201810332281 A CN 201810332281A CN 108493902 B CN108493902 B CN 108493902B
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- 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
- H02H7/04—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 transformers
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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
- H02H3/20—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 voltage
Abstract
The embodiment of the present invention proposes a kind of self-protection circuit and system, is related to technical field of lamps.Self-protection circuit includes constant-current source, transformer, relay, electrical appliance, resistive module, operational amplifier and switch module, transformer respectively with relay, constant-current source, resistive module and electrical appliance electrical connection, operational amplifier respectively with resistive module, switch module electrical connection, switch module is electrically connected with relay, operational amplifier is for receiving abnormal voltage by resistive module in electrical appliance open circuit, and the output abnormality signal when abnormal voltage reaches pre-set value, switch module after receiving abnormal signal for being connected, relay is used to change connection status after switch module conducting, so that transformer is not damaged.Self-protection circuit provided by the invention and system have the transformer protected in circuit, make entire circuit lamps and lanterns after failure, the advantages of will not influence the normal operation on entire airport.
Description
Technical field
The present invention relates to technical field of lamps, in particular to a kind of self-protection circuit and system.
Background technique
Currently, as the improvement of people's living standards, more and more people have more selections in trip, and aircraft by
It is welcomed by the people in its fireballing feature, therefore Aviation Industry obtains huge development, meanwhile, the illumination on airport
It can emphasis concerned by people.
Since airport generally uses constant-current source, so biggish high pressure can be generated when the lamps and lanterns on airport break down, from
And the critical elements in circuit is caused to be damaged, especially transformer is easily damaged.Also, since lamps and lanterns are in transformer rear end, institute
The high pressure of airport constant-current source can be isolated, can directly replace, if but transformer damage, in addition to that can make to connect in transformer
Other than secondary lamps and lanterns do not work, it is also possible to so that entire airport constant-current source is not worked, if the circuit of this airport constant-current source is just
Well in operation, it influences whether the Normal Takeoff and Landing of aircraft, influences the normal operation on entire airport.
It is the emphasis of those skilled in the art's concern in view of this, how to solve the above problems.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of self-protection circuit, to solve in the prior art when airport lamp
The problem of when tool breaks down, transformer is easily damaged, and entire circuit is caused to be broken down.
Another object of the present invention is to provide a kind of Self-Protection Subsystems, to solve in the prior art when airport lamps and lanterns occur
The problem of when failure, transformer is easily damaged, and entire circuit is caused to be broken down.
To achieve the goals above, technical solution used in the embodiment of the present invention is as follows:
On the one hand, the embodiment of the invention provides a kind of self-protection circuit, the self-protection circuit includes constant-current source, transformation
Device, relay, electrical appliance, resistive module, operational amplifier and switch module, the transformer respectively with the relay,
The constant-current source, the resistive module and the electrical appliance electrical connection, the operational amplifier respectively with the resistive module,
The switch module electrical connection, the switch module are electrically connected with the relay, and the operational amplifier is used in the use
Abnormal voltage, and the output abnormality when the abnormal voltage reaches pre-set value are received by the resistive module when electric appliance open circuit
Signal, for being connected after receiving the abnormal signal, the relay is used in the switch module switch module
Change connection status after conducting, so that the transformer is not damaged.
Further, the transformer include the first winding, the second winding, the tertiary winding and the 4th winding, described first
Winding and second winding are the primary of the transformer, and the tertiary winding and the 4th winding are affiliated transformer
Secondary, and first winding is identical as the number of turns of second winding, first winding, second winding with it is described
Relay electrical connection, the tertiary winding are electrically connected with the electrical appliance, the resistive module with the 4th winding, work as institute
When stating electrical appliance normal operation, the relay is in the first connection status, so that first winding and second winding
Composition series connection winding, when the electrical appliance open circuit, the relay be in the second connection status so that first winding and
Second winding forms parallel winding.
Further, the relay includes dpdt relay, and the dpdt relay includes the first activity
End, first end, second end, the second movable end, third end and the 4th end, first winding include the first foot and crus secunda,
Second winding includes third foot and the 4th foot, and first foot and the third foot are Same Name of Ends, first foot, institute
The 4th foot is stated to be electrically connected with the constant-current source, first foot is electrically connected with first movable end, the crus secunda with it is described
The electrical connection of second movable end, the third foot is electrically connected with the second end, the third end respectively, the 4th foot with it is described
The electrical connection of 4th end, when the electrical appliance operates normally, first movable end is electrically connected with the first end, and described second
Movable end is electrically connected with the third end, and when the electrical appliance open circuit, first movable end is electrically connected with the second end,
Second movable end is electrically connected with the 4th end.
Further, the self-protection circuit further includes the first rectifier diode and the second rectifier diode, the third
Winding includes the 5th foot and the 6th foot, and the 4th winding includes the 7th foot and octal, and first foot, third foot, the
Six feet and octal are Same Name of Ends, and the 6th foot and the 7th foot are electrically connected and grounded, the 5th foot with it is described
The anode of first rectifier diode is electrically connected, first rectifier diode and cathode respectively with the resistive module, described
Electrical appliance electrical connection, the octal are electrically connected with the anode of second rectifier diode, second rectifier diode
Cathode is also electrically connected with the resistive module, the electrical appliance respectively.
Further, the tertiary winding is identical as the number of turns of the 4th winding.
Further, the resistive module includes first resistor and second resistance, one end of the first resistor with it is described
First rectifier diode, second rectifier diode cathode electrical connection, the other end of the first resistor respectively with it is described
One end electrical connection of the noninverting input of operational amplifier, the second resistance, the other end ground connection of the second resistance.
Further, the self-protection circuit further includes reference power supply, and the resistive module further includes 3rd resistor, described
One end of 3rd resistor is electrically connected with the cathode of first rectifier diode, second rectifier diode, the third electricity
The other end of resistance is electrically connected with one end of the reverse input end of the operational amplifier, the reference power supply respectively, the benchmark
The other end of power supply is grounded, when the electrical appliance is in failure dress state, the electricity of the noninverting input of the operational amplifier
Pressure increases, and when the voltage of the noninverting input of the operational amplifier is greater than the voltage of the reverse input end, the fortune
The output end for calculating amplifier exports high level, so that the switch module is connected.
Further, the switch module includes triode, and the base stage of the triode is defeated with the operational amplifier
Outlet electrical connection, the emitter ground connection of the triode, the collector of the triode is electrically connected with the relay, when described
When triode ON, the relay is changed into the second connection status.
Further, the electrical appliance includes halogenic lamps and lanterns, LED lamp and sensor.
On the other hand, the embodiment of the invention also provides a kind of Self-Protection Subsystem, the Self-Protection Subsystem include it is multiple from
Protect circuit, and the electrical appliance series connection of multiple self-protection circuits.
Compared with the prior art, the invention has the following advantages:
The present invention provides a kind of self-protection circuit and system, which includes constant-current source, transformer, relay
Device, electrical appliance, resistive module, operational amplifier and switch module, operational amplifier is for passing through electricity in electrical appliance open circuit
It hinders module and receives abnormal voltage, and the output abnormality signal when abnormal voltage reaches pre-set value, switch module is for receiving
It is connected after to abnormal signal, relay is used to change connection status after switch module conducting, so that transformer is not damaged.By
It can judge whether lamps and lanterns damage according to operational amplifier in self-protection circuit provided by the invention, and when lamps and lanterns damage
Operational amplifier output abnormality signal, and then switch module is connected, so that relay status changes, so as to avoid transformer
Damage, protect the transformer in circuit, make entire circuit lamps and lanterns after failure, entire circuit will not be made not
It can work, will not influence the normal operation on entire airport.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows the module diagram of the self-protection circuit of one embodiment of the present of invention offer.
Fig. 2 shows the circuit diagrams for the self-protection circuit that one embodiment of the present of invention provides.
Fig. 3 shows the schematic diagram of the relay of one embodiment of the present of invention offer.
Fig. 4 shows the module diagram of the Self-Protection Subsystem of one embodiment of the present of invention offer.
Icon: 100- self-protection circuit；110- constant-current source；120- transformer；The first foot of 121-；122- crus secunda；123-
Third foot；The 4th foot of 124-；The 5th foot of 125-；The 6th foot of 126-；The 7th foot of 127-；128- octal；130- relay；131-
First movable end；The second movable end of 132-；133- first end；134- second end；135- third end；The 4th end 136-；140- is used
Electric appliance；150- resistive module；151- first resistor；152- second resistance；153- 3rd resistor；160- operational amplifier；170-
Switch module；180- reference power supply；The first zener diode of 190-；The second zener diode of 191-；200- Self-Protection Subsystem.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile of the invention
In description, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " connected ", " connection " shall be understood in a broad sense,
It for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connection, be also possible to electricity
Connection；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary.For
For those skilled in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.It ties below
Attached drawing is closed, is elaborated to some embodiments of the present invention.In the absence of conflict, following embodiment and embodiment
In feature can be combined with each other.
First embodiment
Fig. 1 is please referred to, the embodiment of the invention provides a kind of self-protection circuit 100, which includes constant current
Source 110, transformer 120, relay 130, electrical appliance 140, resistive module 150, operational amplifier 160, switch module 170 and
Reference power supply 180, transformer 120 are electrically connected with relay 130, constant-current source 110, resistive module 150 and electrical appliance 140 respectively
It connects, operational amplifier 160 is electrically connected with switch module 170, and switch module 170 is electrically connected with relay 130, reference power supply 180
It is electrically connected with the operational amplifier 160.
In the present embodiment, operational amplifier 160 is used to receive in 140 open circuit of electrical appliance by resistive module 150 different
Normal voltage, and the output abnormality signal when abnormal voltage reaches pre-set value, switch module 170 is for receiving abnormal signal
After be connected, relay 130 be used for switch module 170 conducting after change connection status so that transformer 120 is not damaged.It needs
It is noted that in the present embodiment, abnormal voltage refers to defeated greater than reversed in the voltage of the noninverting input of operational amplifier 160
Enter voltage when holding.
Referring to Fig. 2, specifically, transformer 120 includes the first winding, the second winding, the tertiary winding and the 4th winding, the
One winding and the second winding are the primary of transformer 120, the tertiary winding and the 4th winding for the secondary of transformer 120, and first
Winding is identical as the number of turns of the second winding, and the first winding, the second winding are electrically connected with relay 130, the tertiary winding and the 4th
Winding is electrically connected with electrical appliance, resistive module 150, and when electrical appliance 140 operates normally, relay 130 is in the first connection
State, the winding so that the first winding is connected with the second winding composition, when 140 open circuit of electrical appliance, relay 130 is in second and connects
State is connect, so that the first winding and the second winding form parallel winding,
Further, referring to Fig. 3, relay 130 includes dpdt relay 130, dpdt relay 130 is wrapped
Include the first movable end 131, first end 133, second end 134, the second movable end 132, third end 135 and the 4th end 136, first
Winding includes the first foot 121 and crus secunda 122, and the second winding includes third foot 123 and the 4th foot 124, and the first foot 121 and the
Three feet 123 are Same Name of Ends, and the first foot 121, the 4th foot 124 are electrically connected with constant-current source 110, the first foot 121 and the first movable end 131
Electrical connection, crus secunda 122 are electrically connected with the second movable end 132, and third foot 123 is electrically connected with second end 134, third end 135 respectively
It connecing, the 4th foot 124 is electrically connected with the 4th end 136, when electrical appliance 140 operates normally, the first movable end 131 and first end 133
Electrical connection, the second movable end 132 are electrically connected with third end 135, when 140 open circuit of electrical appliance, the first movable end 131 and second end
134 electrical connections, the second movable end 132 are electrically connected with the 4th end 136.By the connection type, when electrical appliance 140 operates normally
When, the first winding and the second windings in series；When 140 open circuit of electrical appliance, the first winding and the second winding parallel.
It should be noted that the first winding is winding of connecting with the second winding due to when electrical appliance 140 operates normally,
So the maximum power of transformer 120 can be played, and when 140 open circuit of electrical appliance, due to the first winding and the second winding
It is in parallel.And first winding it is identical as the number of turns of the second winding, so each winding need to only share the impact energy of half, to have
The protection transformer 120 of effect is not damaged, ensure that the normal operation of circuit.
Due to passing through the electric current potentially unstable after transformer 120 carries out transformation, so in the present embodiment, self-shield electricity
Road 100 further includes the first rectifier diode and the second rectifier diode, and the tertiary winding includes the 5th foot 125 and the 6th foot 126, the
Four windings include the 7th foot 127 and octal 128, and the first foot 121, third foot 123, the 6th foot 126 and octal 128 are equal
For Same Name of Ends, the 6th foot 126 and the 7th foot 127 are electrically connected and grounded, and the anode of the 5th foot 125 and the first rectifier diode is electrically connected
Connect, the first rectifier diode with cathode be electrically connected respectively with resistive module 150, electrical appliance 140, octal 128 and second whole
The anode electrical connection of diode is flowed, the cathode of the second rectifier diode is also electrically connected with resistive module 150, electrical appliance 140 respectively.
Also, in the present embodiment, the tertiary winding is also identical as the number of turns of the 4th winding, to make to flow through the first rectification two
Pole pipe is equal with the electric current of the second rectifier diode, more stable.
It should be noted that in the present embodiment, first the first movable end of connection status value 131 is electrically connected with first end 133
It connects, and state when the second movable end 132 is connect with third end 135, the second connection status refer to the first movable end 131 and second end
134 electrical connections, and state when the second movable end 132 is connect with the 4th end 136.
Further, resistive module 150 includes first resistor 151, second resistance 152 and 3rd resistor 153, the first electricity
One end of resistance 151 is electrically connected with the cathode of the first rectifier diode, the second rectifier diode, the other end point of first resistor 151
It is not electrically connected with one end of the noninverting input of operational amplifier 160, second resistance 152, another termination of second resistance 152
Ground.One end of 3rd resistor 153 is electrically connected with the cathode of the first rectifier diode, the second rectifier diode, 3rd resistor 153
The other end is electrically connected with one end of the reverse input end of operational amplifier 160, reference power supply 180 respectively, reference power supply 180 it is another
One end ground connection, when electrical appliance 140 is in failure dress state, the voltage of the noninverting input of operational amplifier 160 is increased, and works as
When the voltage of the noninverting input of operational amplifier 160 is greater than the voltage of reverse input end, the output end output of operational amplifier
High level, so that switch module 170 is connected.
Switch module 170 includes triode, and the base stage of triode is electrically connected with the output end of operational amplifier 160, three poles
The emitter of pipe is grounded, and the collector of triode is electrically connected with relay 130, and when triode ON, relay 130 is changed into
Second connection status.In the present embodiment, when the output end of operational amplifier exports high level, triode ON, triode
The actuation of relay 130 can be controlled after conducting, to make relay 130 be changed into the second connection status from the first connection status, i.e.,
So that being changed into series connection from series connection between the first winding and the second winding, so that transformer 120 be prevented to damage.
It should be noted that in the present embodiment, electrical appliance 140 includes halogenic lamps and lanterns, LED lamp and sensor.When
So, in some other embodiments, electrical appliance 140 can also be with other electrical appliances 140, and the present embodiment does not do this any
It limits.
The working principle of self-protection circuit 100 provided in this embodiment are as follows:
For self-protection circuit 100 suitable for airport AC constant-current source 110, airport constant-current source 110 first passes through 120 He of transformer
The circuit that relay 130 forms, is then coupled to the secondary of transformer 120, passes through the first rectifier diode and the second rectification two
Pole pipe is rectified.The partial pressure electricity being made up of first resistor 151, reference power supply 180, second resistance 152 and 3rd resistor 153
Operational amplifier 160 is sent on road, and operational amplifier 160 controls relay 130 by triode and is attracted, and realizes protection airport lamp
Tool.
In normal work, the first movable end 131 of relay 130 is in normally off, the second activity with first end 133
End 132 is also at normally off with third section, the crus secunda 122 and third foot 123 of transformer 120 pass through relay 130 the
Two movable ends 132 are connected to third end 135, i.e., first the second windings in series of winding of transformer 120 works, to play
The maximum power of transformer 120.
5th foot 125 of transformer 120 is connected with the first rectifier diode；6th foot 126 of transformer 120 and the 7th foot
127 are connected external with ground；The octal 128 of transformer 120 is connected with the second rectifier diode.First rectifier diode and
Two rectifier diodes form full-wave rectifying circuit, and the electric current of full-wave rectification only has the half of full-bridge rectification, the constant-current source 110 on airport
When abnormal, it can effectively mitigate the rush of current of rectifying tube.
The bleeder circuit that first resistor 151 and second resistance 152 form is sent into the noninverting input of operational amplifier 160；
3rd resistor 153 and reference voltage standard at bleeder circuit be sent into the reverse input end of operational amplifier 160；Operational amplifier
160, which control relay 130 by triode, is attracted.When airport constant-current source 110 over-voltage occurs or crosses throat floater, pass through transformer
120 coupling is loaded on the lamps and lanterns of airport, can all be shown as voltage raising, be passed through first resistor 151 and second resistance 152 at this time
Partial pressure, the noninverting input voltage of operational amplifier 160 can increase, when the voltage of noninverting input is greater than reverse input end
When voltage, operational amplifier 160 can export high level, make triode ON, and control relay 130 is attracted, and utilize relay 130
Double-pole double throw characteristic, relay 130 actuation after, the first winding and the second winding composition parallel winding, due to the first winding
It is identical as the number of turns of the second winding, so each winding need to only share the impact energy of half, and then effective after parallel operation
Protect transformer 120 not damaged.
Second embodiment
Referring to Fig. 4, being 200 the embodiment of the invention also provides a kind of self-shield, which includes multiple
Self-protection circuit 100 as in the first embodiment, and the electrical appliance 140 of multiple fault detection circuits is connected.
Specifically, connect due to being provided with multiple lamps and lanterns in airport, and between lamps and lanterns, due between each lamps and lanterns away from
From longer, so in the present embodiment, to reduce wiring cost, each light source is respectively provided with a self-protection circuit 100, thus
Reduce wiring cost.
In conclusion the self-protection circuit includes constant-current source, transformation the present invention provides a kind of self-protection circuit and system
Device, relay, electrical appliance, resistive module, operational amplifier and switch module, operational amplifier are used in electrical appliance open circuit
Abnormal voltage is received by resistive module, and the output abnormality signal when abnormal voltage reaches pre-set value, switch module are used for
Be connected after receiving abnormal signal, relay be used for switch module conducting after change connection status so that transformer not by
Damage.Since self-protection circuit provided by the invention can judge whether lamps and lanterns damage according to operational amplifier, and work as lamp
Operational amplifier output abnormality signal when tool damage, and then switch module is connected, so that relay status changes, to avoid
Transformer damages, and protects the transformer in circuit, make entire circuit lamps and lanterns after failure, will not make whole
A circuit cannot work, and will not influence the normal operation on entire airport.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should also be noted that similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
Claims (9)
1. a kind of self-protection circuit, which is characterized in that the self-protection circuit includes constant-current source, transformer, relay, electricity consumption
Device, resistive module, operational amplifier and switch module, the transformer respectively with the relay, constant-current source, described
Resistive module and electrical appliance electrical connection, the operational amplifier are electric with the resistive module, the switch module respectively
Connection, the switch module are electrically connected with the relay, and the operational amplifier in the electrical appliance open circuit for passing through
The resistive module receives abnormal voltage, and the output abnormality signal when the abnormal voltage reaches pre-set value, the switch
For being connected after receiving the abnormal signal, the relay is used to change connection after the switch module conducting module
State, so that the transformer is not damaged；
Wherein, the transformer includes the first winding, the second winding, the tertiary winding and the 4th winding, first winding and institute
The primary that the second winding is the transformer is stated, the tertiary winding and the 4th winding are the secondary of the transformer, and
First winding is identical as the number of turns of second winding, first winding, second winding with the relay
Electrical connection, the tertiary winding is electrically connected with the electrical appliance, the resistive module with the 4th winding, when the electricity consumption
When device operates normally, the relay is in the first connection status, so that first winding and the second winding group bunchiness
Join winding, when the electrical appliance open circuit, the relay be in the second connection status, so that first winding and described the
Two windings form parallel winding.
2. self-protection circuit as described in claim 1, which is characterized in that the relay includes dpdt relay, institute
It states dpdt relay and includes the first movable end, first end, second end, the second movable end, third end and the 4th end, it is described
First winding includes the first foot and crus secunda, and second winding includes third foot and the 4th foot, and first foot with it is described
Third foot is Same Name of Ends, and first foot, the 4th foot are electrically connected with the constant-current source, and first foot and described first is lived
Moved end electrical connection, the crus secunda is electrically connected with second movable end, the third foot respectively with the second end, described the
The electrical connection of three ends, the 4th foot are electrically connected with the 4th end, when the electrical appliance operates normally, first movable end
It being electrically connected with the first end, second movable end is electrically connected with the third end, when the electrical appliance open circuit, described
One movable end is electrically connected with the second end, and second movable end is electrically connected with the 4th end.
3. self-protection circuit as claimed in claim 2, which is characterized in that the self-protection circuit further includes two pole of the first rectification
Pipe and the second rectifier diode, the tertiary winding include the 5th foot and the 6th foot, and the 4th winding includes the 7th foot and the
Octal, and first foot, third foot, the 6th foot and octal are Same Name of Ends, the 6th foot and the 7th foot electricity
Connection and be grounded, the 5th foot is electrically connected with the anode of first rectifier diode, first rectifier diode and
Cathode is electrically connected with the resistive module, the electrical appliance respectively, the anode of the octal and second rectifier diode
Electrical connection, the cathode of second rectifier diode are also electrically connected with the resistive module, the electrical appliance respectively.
4. self-protection circuit as claimed in claim 3, which is characterized in that the number of turns of the tertiary winding and the 4th winding
It is identical.
5. self-protection circuit as claimed in claim 3, which is characterized in that the resistive module includes first resistor and the second electricity
Resistance, one end of the first resistor is electrically connected with the cathode of first rectifier diode, second rectifier diode, described
The other end of first resistor is electrically connected with one end of the noninverting input of the operational amplifier, the second resistance respectively, institute
State the other end ground connection of second resistance.
6. self-protection circuit as claimed in claim 5, which is characterized in that the self-protection circuit further includes reference power supply, institute
Stating resistive module further includes 3rd resistor, one end of the 3rd resistor and first rectifier diode, second rectification
The cathode of diode is electrically connected, the other end of the 3rd resistor respectively with the reverse input end of the operational amplifier, described
One end of reference power supply is electrically connected, the other end ground connection of the reference power supply, described when the electrical appliance is in off state
The voltage of the noninverting input of operational amplifier increases, and when the voltage of the noninverting input of the operational amplifier is greater than described
When the voltage of reverse input end, the output end of the operational amplifier exports high level, so that the switch module is connected.
7. self-protection circuit as claimed in claim 6, which is characterized in that the switch module includes triode, three pole
The base stage of pipe is electrically connected with the output end of the operational amplifier, the emitter ground connection of the triode, the collection of the triode
Electrode is electrically connected with the relay, and when the triode ON, the relay is changed into the second connection status.
8. self-protection circuit as described in claim 1, which is characterized in that the electrical appliance include halogenic lamps and lanterns, LED lamp with
And sensor.
9. a kind of Self-Protection Subsystem, which is characterized in that the Self-Protection Subsystem includes multiple such as claim 1 to 8 any one
The self-protection circuit, and the electrical appliance series connection of multiple self-protection circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810332281.9A CN108493902B (en) | 2018-04-13 | 2018-04-13 | A kind of self-protection circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810332281.9A CN108493902B (en) | 2018-04-13 | 2018-04-13 | A kind of self-protection circuit and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108493902A CN108493902A (en) | 2018-09-04 |
| CN108493902B true CN108493902B (en) | 2019-10-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810332281.9A Active CN108493902B (en) | 2018-04-13 | 2018-04-13 | A kind of self-protection circuit and system |
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| CN110034536A (en) * | 2019-04-01 | 2019-07-19 | 邓依诺 | A kind of middle school teaching experiment power supply protection system |
Citations (4)
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|---|---|---|---|---|
| CN1076064A (en) * | 1992-03-04 | 1993-09-08 | 龚秋声 | The interchange voltage regulating circuit with controllable of controllable devices conversion transformation ratio |
| CN201467510U (en) * | 2009-07-08 | 2010-05-12 | 阎智广 | AC temperature-control constant-current multi-section voltage-limiting protective LED lighting lamp circuit |
| CN104216449A (en) * | 2014-09-12 | 2014-12-17 | 成都威邦科技有限公司 | Controllable alternating-current stabilized-voltage power supply |
| CN204243728U (en) * | 2014-12-13 | 2015-04-01 | 广发电器集团有限公司 | Transformer overload protection warning device |
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2018
- 2018-04-13 CN CN201810332281.9A patent/CN108493902B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076064A (en) * | 1992-03-04 | 1993-09-08 | 龚秋声 | The interchange voltage regulating circuit with controllable of controllable devices conversion transformation ratio |
| CN201467510U (en) * | 2009-07-08 | 2010-05-12 | 阎智广 | AC temperature-control constant-current multi-section voltage-limiting protective LED lighting lamp circuit |
| CN104216449A (en) * | 2014-09-12 | 2014-12-17 | 成都威邦科技有限公司 | Controllable alternating-current stabilized-voltage power supply |
| CN204243728U (en) * | 2014-12-13 | 2015-04-01 | 广发电器集团有限公司 | Transformer overload protection warning device |
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| CN108493902A (en) | 2018-09-04 |
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