CN206412743U - Circuit protection device and electric power system - Google Patents
Circuit protection device and electric power system Download PDFInfo
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- CN206412743U CN206412743U CN201720127557.0U CN201720127557U CN206412743U CN 206412743 U CN206412743 U CN 206412743U CN 201720127557 U CN201720127557 U CN 201720127557U CN 206412743 U CN206412743 U CN 206412743U
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Abstract
The utility model provides a kind of circuit protection device and electric power system, is related to the technical field of safe power supply, effectively can protect transmission line of electricity when occurring short circuit or overload, improve the security of transmission line of electricity.The circuit protection device, including induction coil, rectification circuit and induction chip；The induction coil is used to be connected with the primary coil mutual inductance of transformer, and produces alternating current impression signal；The rectification circuit is connected between the induction coil and the induction chip, and the alternating current impression signal rectification is direct current induced signal by the rectification circuit；The induction chip receives the direct current induced signal, and when the direct current induced signal exceeds preset value, the induction chip exports power-off signal.
Description
Technical field
The utility model is related to safe power supply technical field, is more particularly, to a kind of circuit protection device and power supply
System.
Background technology
With the development of power technology, industrial-frequency alternating current (i.e. civil power) has spread all over each family and unit, electricity consumption
Security also becomes more and more important.
Current civil power is generally powered by two output lines, wherein one is live wire, another is zero line.Work as electrical equipment
Break down, or when aging circuit, breakage, short circuit can occur between live wire and zero line, it is easy to cause fire, Yi Jiyong
Electric equipment and circuit such as burn at the adverse consequences.
In addition, the electrical equipment general power in access is larger, in the case of having exceeded the nominal load of supply line in itself,
In the case of overloading, the electric current of supply line can be caused excessive, will also result in electrical equipment and circuit burns.
Therefore, short circuit and overload are to influence two major reasons of safe power supply, currently for short circuit and the strick precaution of overload
Measure, typically using modes such as fuse or relays, is monitored to the electric current of the outlet line of civil power.Work as outlet line
Electric current it is excessive when, by blown fuse, or relay such as disconnects at the mode, the power supply of outlet line is cut off, to realize circuit
And the protection of electrical equipment.But, the sensitivity of existing protection method is relatively low, when occurring short circuit or overload, it is impossible to effectively
Circuit is protected.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of circuit protection device and electric power system, Neng Gou
Transmission line of electricity effectively is protected when generation short circuit or overload, the security of transmission line of electricity is improved.
In a first aspect, the utility model embodiment provides a kind of circuit protection device, including induction coil, rectification circuit
And induction chip；
The induction coil is used to be connected with the primary coil mutual inductance of transformer, and produces alternating current impression signal；
The rectification circuit is connected between the induction coil and the induction chip, and the rectification circuit is handed over described
The rectification of influenza induction signal is direct current induced signal；
The induction chip receives the direct current induced signal, described when the direct current induced signal exceeds preset value
Induction chip exports power-off signal.
With reference in a first aspect, the utility model embodiment provide first aspect the first possible embodiment, its
In, the rectification circuit is rectifier bridge.
With reference in a first aspect, the utility model embodiment provide first aspect second of possible embodiment, its
In, the circuit protection device also includes the filter circuit being connected between the rectification circuit and the induction chip and amplification electricity
Road.
With reference in a first aspect, the utility model embodiment provide first aspect the third possible embodiment, its
In, the induction chip includes comparing unit and trigger element；
The comparing unit receives the direct current induced signal, and the direct current induced signal and the preset value are carried out
Compare；
When the direct current induced signal exceeds preset value, the trigger element exports power-off signal.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 4th of first aspect kind, wherein, institute
State and multistable trigger is provided with trigger element；
When the direct current induced signal exceeds preset value, the multistable trigger exports power-off signal.
Second aspect, the utility model embodiment also provides a kind of electric power system, including transformer and above-mentioned circuit
Protection device；
The primary coil of the transformer is in series with sensing winding,
Induction coil in the circuit protection device is connected with the sensing winding mutual inductance.
With reference to second aspect, the utility model embodiment provides the first possible embodiment of second aspect, its
In, the electric power system also includes the first relay；
The output end of the induction chip connects the control end of first relay.
With reference to second aspect, the utility model embodiment provides second of possible embodiment of second aspect, its
In, the first output end of the induction chip connects the control coil of first relay by controllable silicon；
Second output end of the induction chip connects the control end of the controllable silicon by bilateral diode.
With reference to second aspect, the utility model embodiment provides the third possible embodiment of second aspect, its
In, the electric power system also includes the second relay；
The output end of first relay is connected with the control coil of second relay, second relay
Output end is connected with the primary coil.
With reference to second aspect, the utility model embodiment provides the 4th kind of possible embodiment of second aspect, its
In, first relay is closed type relay, and second relay is normal-open type relay.
The utility model embodiment brings following beneficial effect：
In the circuit protection device that the utility model embodiment is provided, including induction coil, rectification circuit and induction chip.
Wherein, induction coil is used to be connected with the primary coil mutual inductance of transformer, between the circuit by the primary coil of transformer
Mutual inductance effect, produce alternating current impression signal.Rectification circuit is connected between induction coil and induction chip, for exchange to be felt
Induction signal rectification is direct current induced signal.Induction chip receives direct current induced signal, when direct current induced signal exceeds preset value,
Induction chip exports power-off signal, disconnects the power supply of transmission line of electricity.The circuit protection device that the utility model embodiment is provided, profit
Mutual inductance is carried out to the primary coil of transformer with induction coil, and is protected the size of current of the primary coil as short circuit and overload
The condition of shield, therefore, it is possible to provide the sensitivity of circuit protection, more efficient protection transmission line of electricity, so as to improve transmission line of electricity
Security.
Other feature and advantage of the present utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages are in explanation
Specifically noted structure is realized and obtained in book, claims and accompanying drawing.
To enable above-mentioned purpose of the present utility model, feature and advantage to become apparent, preferred embodiment cited below particularly, and
Coordinate appended accompanying drawing, be described in detail below.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram for the circuit protection device that the utility model embodiment one is provided；
Fig. 2 is the schematic diagram for the circuit protection device that the utility model embodiment one is provided；
Fig. 3 is the schematic diagram of induction chip in the circuit protection device that the utility model embodiment one is provided；
Fig. 4 is the schematic diagram for the electric power system that the utility model embodiment two is provided.
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with accompanying drawing to this
The technical scheme of utility model is clearly and completely described, it is clear that described embodiment is that the utility model part is real
Apply example, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, belongs to the scope of the utility model protection.
Currently for short circuit and the precautionary measures of overload, typically using modes such as fuse or relays, to civil power
The electric current of outlet line is monitored.When the electric current of outlet line is excessive, by blown fuse, or relay such as disconnects at the side
Formula, cuts off the power supply of outlet line, to realize the protection of circuit and electrical equipment.But, the sensitivity of existing protection method
It is relatively low, when occurring short circuit or overload, it is impossible to effectively circuit is protected.
Based on this, the purpose of this utility model is to provide a kind of circuit protection device and electric power system, can be in hair
Transmission line of electricity effectively is protected when raw short circuit or overload, the security of transmission line of electricity is improved.
Embodiment one：
The utility model embodiment provides a kind of circuit protection device, can be applied to the power supply field such as family, office, factory
Scape.As depicted in figs. 1 and 2, the circuit protection device includes induction coil L1, rectification circuit and induction chip.
Wherein, induction coil be used for be connected with the primary coil mutual inductance of transformer, by with the primary coil of transformer
Mutual inductance effect between circuit, produces alternating current impression signal.Rectification circuit is connected between induction coil L1 and induction chip, is used
In the alternating current impression signal rectification for sensing induction coil L1 be direct current induced signal.Induction chip receives direct current sensing letter
Number, when direct current induced signal exceeds preset value, induction chip output power-off signal disconnects the power supply of transmission line of electricity.
The circuit protection device that the utility model embodiment is provided, is entered using induction coil L1 to the primary coil of transformer
Row mutual inductance, and using the size of current of primary coil as short circuit and the condition of overload protection, therefore, it is possible to provide circuit protection
Sensitivity, more efficient protection transmission line of electricity, so as to improve the security of transmission line of electricity.
In the present embodiment, rectification circuit is realized in the form of rectifier bridge, rectifier bridge specifically by four diode D1, D2,
D3, D4 are constituted in the way of bridge-type is connected.By setting rectifier bridge, you can realize the alternating current impression sensed to induction coil L1
Signal carries out rectification, and shape is periodically direct current induced signal.
In the circuit protection device that the utility model embodiment is provided, in addition to be connected to rectification circuit and induction chip it
Between filter circuit.Filter circuit is made up of two filter capacitors C1, C2 and filter resistance R1, by filter capacitor C1, C2 with
And filter resistance R1 is filtered to direct current induced signal, the voltage of direct current induced signal is set to limit within limits.
In addition, the output end of filter circuit provides electricity also by connecting power end V+, V- of induction chip for induction chip
Source.
Further, in the circuit protection device that the utility model embodiment is provided, in addition to filter circuit and sense are connected to
Answer the amplifying circuit between chip.Amplifying circuit is mainly made up of the first variable resistor W1 and PNP type triode T1, direct current sensing
Signal can generate larger current signal by triode T1 amplification, and the current signal is converted to after resistance R3
Induced voltage signal, and input the first input end a1 of induction chip.The voltage-regulator diode D5 connected with the first variable resistor W1
With resistance R2, voltage stabilizing and the effect of current limliting are each served as.
In addition, also including the second adjustable resistance W2 in the amplifying circuit, the second adjustable resistance W2, which is used to sense direct current, to be believed
Reference voltage signal number is converted to, the second input a2 of induction chip is inputted.
In the present embodiment, variable resistor W1, W2 resistance can be adjusted 0 between 5.1k Ω, variable resistor W1, W2 tool
Setting can be adjusted according to the voltage of application scenarios, current conditions when dispatching from the factory in the resistance of body.
Induction chip is mainly monitored to the first input end a1 induced voltage signals received, and according to induced voltage
The change output power-off signal of signal.Meanwhile, the reference voltage signal that induction chip can also be received to the second input a2
It is monitored, power-off signal can also be exported when reference voltage signal occurs abnormal.
As shown in figure 3, specifically including comparing unit 31 and trigger element 32 in induction chip in the present embodiment.Compare list
Member 31 receives direct current induced signal (i.e. induced voltage signal and reference voltage signal), and by induced voltage signal and reference voltage
Signal is compared with corresponding preset value.When induced voltage signal exceeds corresponding preset value, or reference voltage signal
During beyond corresponding preset value, trigger element 32 will export power-off signal, disconnect the power supply of transmission line of electricity.
As a preferred scheme, multistable trigger is provided with trigger element 32, when direct current induced signal is beyond pre-
If during value, multistable trigger output power-off signal.Multistable trigger is also referred to as n steady state triggers, is bistable state tentaculum
Further development.If having dc-couple between the input of every one-level of n amplifying stage and remaining output end at different levels, one
Determine to can obtain n stable state under bar, and there was only one-level conducting in each stable state, and remaining is turned off.In nonbinary
In counter circuit, the quick response under a variety of different conditions can be realized using polymorphic trigger, therefore compare flip and flop generator
Response speed faster.
By using with highly sensitive comparing unit 31 and trigger element 32 in the utility model embodiment, and
Multistable trigger is set in trigger element 32, induction chip was responded within 0.1 second, so that within the extremely short time
Disconnect power supply, effectively protection electrical equipment and supply line.
The circuit protection device that the utility model embodiment is provided, is entered using induction coil L1 to the primary coil of transformer
Row mutual inductance, and using the size of current of primary coil as short circuit and the condition of overload protection, therefore, it is possible to provide circuit protection
Sensitivity, more efficient protection transmission line of electricity, so as to improve the security of transmission line of electricity.
Embodiment two：
As shown in figure 4, the utility model embodiment provides a kind of electric power system, including transformer TB and above-described embodiment
One circuit protection device provided.Wherein, transformer TB primary coil L3 is in series with sensing winding L2, circuit protection device
In induction coil L1 with sensing winding L2 mutual inductances be connected.Transformer TB secondary coil L4 two ends are used as exchange electricity output
End, AC power is provided for electrical equipment.
In the electric power system that the utility model embodiment is provided, in addition to the first relay J1, the output end of induction chip
Connect the first relay J1 control end.
Specifically, the induction chip in the present embodiment has two output ends b1, b2.Wherein, the first of induction chip is defeated
Go out to hold b1 to pass through controllable silicon BG the first relays of connection J1 control coil.Second output end b2 of induction chip passes through two-way two
Pole pipe VD is connected to controllable silicon BG control end.
Controllable silicon BG is also referred to as IGCT (Silicon Controlled Rectifier, abbreviation SCR), with volume
The features such as small, structure is relatively easy, function is strong, is one of the more commonly used semiconductor devices.Controllable silicon BG in the present embodiment
For unidirectional thyristor, unidirectional thyristor is a kind of conductive device of one direction with negative electrode and anode, no as diode
With the point control section that has been many, this just makes it have the working characteristics entirely different with diode.When to unidirectional thyristor
During control end incoming level signal, negative electrode and anode will be turned on.
The level of the second output end b2 outputs of induction chip is transmitted to controllable silicon BG control by bilateral diode VD
End, makes conducting between controllable silicon BG anode and negative electrode.Meanwhile, the level of the first output end b1 of induction chip output is by can
Control silicon BG is exported to the first relay J1 control coil, disconnects the first relay J1 output ends, so as to realize supply line
Protection.
Further, the electric power system that the utility model embodiment is provided also includes the second relay J2.First relay J1
Output end connected with the second relay J2 control coil, the second relay J2 output end and transformer TB primary coil
L3 connects.
As a preferred scheme, when the first relay J1 is closed type relay, i.e. control coil no power first after
Electrical equipment J1 output is in closure state.Meanwhile, when the second relay J2 is normal-open type relay, i.e. control coil no power
First relay J1 output end is off.
In the case of electric power system normal power supply, the first relay J1 control coil no power, the first relay J1
Output in closure state, therefore control power supply can be supplied by the first relay J1 to the second relay J2 control coil
Electricity.Second relay J2 control coil is in the case of energization, and its output is in closure state, to maintain transformer TB's
Primary coil L3 continued powers.Meanwhile, the first output end b1 and the second output end b2 of induction chip are exported without level signal.
When the trigger element in induction chip sends power-off signal, the first relay J1 control coil is powered, and makes the
One relay J1 output end disconnects.Because the first relay J1 output end disconnects, therefore the second relay J2 control line
Circle power-off, disconnects the second relay J2 output end, so that the connection of power network and transformer TB primary coil L3 is cut off, with
The power supply of electric power system is cut off, the protection of supply line is realized.
In the present embodiment, the first relay J1 uses closed type relay, and the second relay J2 uses normal-open type relay
Have further the advantage that：In actual electric power system, can the first relay J1 output end with the second relay J2's
The relay for multiple different purposes of being connected between control coil, such as the relay of relay, overvoltage protection for arc protection
Device, and the relay for short-circuit protection.These relays also all use closed type relay, and each relay is defeated
Go out control coil of the end all with the second relay J2 connect, then wherein the disconnection of any one relay when, can make second after
Electrical equipment J2 control coil power-off, so as to cut off the power supply of power system.
The electric power system that the utility model embodiment two is provided, the circuit protection device provided with above-described embodiment one, tool
There is identical technical characteristic, so can also solve identical technical problem, reach identical technique effect.
In addition, in the description of the utility model embodiment, unless otherwise clearly defined and limited, term " installation ",
" connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected
Connect；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, can
To be the connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the utility model.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outer " are, based on orientation shown in the drawings or position relationship, to be only
Described for the ease of description the utility model and simplifying, rather than to indicate or imply that signified device or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
In addition, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying phase
To importance.
Finally it should be noted that：Embodiment described above, embodiment only of the present utility model, to illustrate this
The technical scheme of utility model, rather than its limitations, protection domain of the present utility model are not limited thereto, although with reference to foregoing
The utility model is described in detail embodiment, it will be understood by those within the art that：It is any to be familiar with this skill
The technical staff in art field is in the technical scope that the utility model is disclosed, and it still can be to the skill described in previous embodiment
Art scheme is modified or can readily occurred in change, or carries out equivalent substitution to which part technical characteristic；And these modifications,
Change is replaced, and the essence of appropriate technical solution is departed from the spirit and model of the utility model embodiment technical scheme
Enclose, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model described should be wanted with right
The protection domain asked is defined.
Claims (10)
1. a kind of circuit protection device, it is characterised in that including induction coil, rectification circuit and induction chip；
The induction coil is used to be connected with the primary coil mutual inductance of transformer, and produces alternating current impression signal；
The rectification circuit is connected between the induction coil and the induction chip, and the rectification circuit feels the exchange
Induction signal rectification is direct current induced signal；
The induction chip receives the direct current induced signal, when the direct current induced signal exceeds preset value, the sensing
Chip exports power-off signal.
2. circuit protection device according to claim 1, it is characterised in that the rectification circuit is rectifier bridge.
3. circuit protection device according to claim 1, it is characterised in that also including being connected to the rectification circuit and institute
State the filter circuit and amplifying circuit between induction chip.
4. circuit protection device according to claim 1, it is characterised in that the induction chip include comparing unit and
Trigger element；
The comparing unit receives the direct current induced signal, and the direct current induced signal and the preset value are compared
Compared with；
When the direct current induced signal exceeds preset value, the trigger element exports power-off signal.
5. circuit protection device according to claim 4, it is characterised in that multistable is provided with the trigger element and is touched
Send out device；
When the direct current induced signal exceeds preset value, the multistable trigger exports power-off signal.
6. a kind of electric power system, it is characterised in that the circuit including transformer and as described in any one of claim 1 to 5 is protected
Protection unit；
The primary coil of the transformer is in series with sensing winding,
Induction coil in the circuit protection device is connected with the sensing winding mutual inductance.
7. electric power system according to claim 6, it is characterised in that also including the first relay；
The output end of the induction chip connects the control end of first relay.
8. electric power system according to claim 7, it is characterised in that the first output end of the induction chip passes through controllable
Silicon connects the control coil of first relay；
Second output end of the induction chip connects the control end of the controllable silicon by bilateral diode.
9. electric power system according to claim 8, it is characterised in that also including the second relay；
The output end of first relay is connected with the control coil of second relay, the output of second relay
Connected with the primary coil at end.
10. electric power system according to claim 9, it is characterised in that first relay is closed type relay, institute
The second relay is stated for normal-open type relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720127557.0U CN206412743U (en) | 2017-02-13 | 2017-02-13 | Circuit protection device and electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720127557.0U CN206412743U (en) | 2017-02-13 | 2017-02-13 | Circuit protection device and electric power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206412743U true CN206412743U (en) | 2017-08-15 |
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ID=59557810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720127557.0U Active CN206412743U (en) | 2017-02-13 | 2017-02-13 | Circuit protection device and electric power system |
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| Country | Link |
|---|---|
| CN (1) | CN206412743U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018145381A1 (en) * | 2017-02-13 | 2018-08-16 | 中领世能 (天津) 科技有限公司 | Circuit protection device and power supply system |
-
2017
- 2017-02-13 CN CN201720127557.0U patent/CN206412743U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018145381A1 (en) * | 2017-02-13 | 2018-08-16 | 中领世能 (天津) 科技有限公司 | Circuit protection device and power supply system |
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