CN106786441A - A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit - Google Patents
A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit Download PDFInfo
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- CN106786441A CN106786441A CN201611262628.4A CN201611262628A CN106786441A CN 106786441 A CN106786441 A CN 106786441A CN 201611262628 A CN201611262628 A CN 201611262628A CN 106786441 A CN106786441 A CN 106786441A
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 18
- 230000005611 electricity Effects 0.000 claims description 3
- 230000007774 longterm Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000004065 semiconductor Substances 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000004087 circulation Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
- H02H9/021—Current limitation using saturable reactors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
Abstract
A kind of electric energy meter the invention discloses current-limiting circuit and comprising the current-limiting circuit.At present using the current-limiting circuit of P metal-oxide-semiconductors, it is unfavorable for that whole circuit works steadily in the long term.Constant flow module of the invention has an input and two output ends, the input of constant flow module is connected with voltage, one output end of constant flow module is connected with the colelctor electrode of the 3rd triode, and another output end is connected with the base stage of the 3rd triode and the colelctor electrode of the 4th triode respectively；The base stage of the 3rd triode is connected with one end of the 4th impedor, and the other end of the 4th impedor is connected with the base stage of the 4th triode；Connected between the emitter stage and the emitter stage of the 4th triode of the 3rd triode the 3rd impedor；The node that 3rd impedor is connected with the emitter stage of the 4th triode is connected with controllable Voltage stabilizing module, and load is connected in the output end of the controllable Voltage stabilizing module.It is an advantage of the invention that current limliting can be realized, and oneself power consumption is smaller, is worked steadily in the long term beneficial to circuit.
Description
Technical field
The present invention relates to circuit, specifically a kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit.
Background technology
In the case that conventional current-limiting circuit is as shown in figure 1, the electric current flowed through in load is larger at present, circuit can be stablized
In maximum current output, output voltage can be pulled low, and P-MOS pipes carry out partial pressure by being operated in linear zone to output circuit, from
And stabilization output current, reach the purpose of current limliting.
But in above-mentioned current-limiting circuit, the power consumption for being responsible for current-limiting circuit part is higher, especially P-MOS pipes work(therein
Consumption is high（Because the work of P-MOS pipes is in linear zone, can always cause that P-MOS pipes are in incomplete conducting state, because of P=UI, triggering
Electric current is constant during protection, and the power consumption of P-MOS is directly proportional to the voltage at its two ends）, this is to component in whole circuit and circuit
Heat dispersion propose requirement very high, be unfavorable for that whole circuit works steadily in the long term, be also unfavorable for comprising above-mentioned limit
The electric energy meter of current circuit works steadily in the long term.
The content of the invention
The technical problem to be solved in the present invention is the defect for overcoming above-mentioned prior art to exist, there is provided one kind can realize limit
Flow and the less current-limiting circuit of oneself power consumption and the electric energy meter comprising the current-limiting circuit, be beneficial to circuit and electric energy meter is steady for a long time
Surely work.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of current-limiting circuit, including voltage, constant current
Module, controllable Voltage stabilizing module, the 3rd impedor, the 4th impedor, the 5th impedor, the 3rd triode and the four or three pole
Pipe；
Described constant flow module has an input and two output ends, and the input of constant flow module is connected with voltage, constant current
One output end of module is connected with the colelctor electrode of the 3rd triode, another output end respectively with the base stage and the 4th of the 3rd triode
The colelctor electrode connection of triode；The base stage of the 3rd triode is connected with one end of the 4th impedor, the 4th impedor
The other end be connected with the base stage of the 4th triode；Between the emitter stage and the emitter stage of the 4th triode of the 3rd triode
Connect the 3rd impedor；The node that 3rd impedor is connected with the emitter stage of the 4th triode connects with controllable Voltage stabilizing module
Connect, the node that the output end of constant flow module is connected with the colelctor electrode of the 4th triode is exported with the reference voltage of controllable Voltage stabilizing module
End connection, load is connected in the output end of the controllable Voltage stabilizing module；The base stage of the 4th impedor and the 4th triode
Connecting node by the 5th impedor be grounded.
Further, the constant flow module includes the 8th impedor, the first triode and the second triode；Described
One end of eight impedors is connected with voltage, and the other end is connected with the colelctor electrode of the second triode；The base of first triode
Pole is connected with the connecting node of the 8th impedor and the colelctor electrode of the second triode；The colelctor electrode difference of first triode
It is connected with the 8th impedor with the connecting node of voltage and the colelctor electrode of the 3rd triode；The emitter stage of first triode
Connecting node with the emitter stage of the base stage and the second triode of the second triode is connected.
Further, described constant flow module also includes a Schottky diode；The Schottky diode is serially connected in
Between the connecting node of the emitter stage of the base stage and the second triode of the emitter stage of one triode and the second triode.
Further, described constant flow module also includes the 6th impedor；6th impedor is serially connected in Xiao Te
Between the emitter stage of based diode and the second triode；One end of 6th impedor connects with the negative pole of Schottky diode
Connect, the other end is connected with the emitter stage of the second triode.
Further, described constant flow module also includes the 7th impedor；7th impedor is serially connected in the 6th
Between the emitter stage of impedor and the second triode, one end of the 7th impedor is connected with impedor, the other end
Emitter stage with the second triode is connected.
Further, described controllable Voltage stabilizing module includes controllable source of stable pressure, the first impedor and the second impedor；
The node connection that the negative electrode of the controllable source of stable pressure is connected with the colelctor electrode of the 6th impedor and the 4th triode, it is described controllable
The anode of source of stable pressure is connected with one end of the 5th impedor and one end of the second impedor respectively；The reference of controllable source of stable pressure
Pole is connected with the other end of the second impedor and one end of the first impedor respectively；The other end of the first impedor and
The emitter stage of four triodes is connected with the 3rd impedor connecting node.
Another technical scheme for using of the present invention for：A kind of electric energy meter, comprising above-mentioned current-limiting circuit.
The present invention compared with prior art, with advantages below：After the electric current in load increases, partial pressure can be triggered,
It is final to cause that the electric current flowed through in load reduces i.e. by the 4th impedor and the 5th impedor, and it is stabilized in one
Steady state value, the power of whole circuit is smaller, damages smaller to component, is conducive to circuit and the permanently effective work of electric energy meter.
Brief description of the drawings
Fig. 1 is the overall structure diagram of prior art；
Fig. 2 is the structural representation of the embodiment of the present invention one；
Fig. 3 is the contrast effect figure of the embodiment of the present invention one and existing GPF (General Protection False circuit；
Fig. 4 is the power consumption schematic diagram of the embodiment of the present invention one.
Described in figure, 1, constant flow module；2nd, controllable Voltage stabilizing module.
Specific embodiment
With reference to Figure of description, the present invention is described in further detail.
Embodiment one
The present embodiment is a kind of current-limiting circuit.
Current-limiting circuit as shown in Fig. 2,3 and 4, it includes that voltage vcc, constant flow module 1, controllable Voltage stabilizing module the 2, the 3rd hinder
Anti- element R3, the 4th impedor R4, the 5th impedor R5, the 3rd triode V3 and the 4th triode V4.The constant current mould
Block 1 has an input and two output ends；The input of constant flow module 1 is connected with voltage vcc；The one of constant flow module 1 is defeated
Go out end be connected with the colelctor electrode of the 3rd triode V3, another output end respectively with the base stage and the 4th triode of the 3rd triode V3
The colelctor electrode connection of V4；The base stage of the 3rd triode V3 is connected with one end of the 4th impedor R4, the 4th impedance
The other end of element R4 is connected with the base stage of the 4th triode V4；Emitter stage, the 3rd impedor of the 3rd triode V3
The emitter stage of R3 and the 4th triode V4 is sequentially connected；What the 3rd impedor R3 was connected with the emitter stage of the 4th triode V4
Node is connected with controllable Voltage stabilizing module 2, the node that the output end of constant flow module 1 is connected with the colelctor electrode of the 4th triode V4 with can
The reference voltage output end connection of Voltage stabilizing module 2 is controlled, the output end of the controllable Voltage stabilizing module 2 is provided with load；Described 4th
The connecting node of the base stage of impedor R4 and the 4th triode V4 is grounded by the 5th impedor R5.
The constant flow module 1 also includes the 8th impedor R8, the 7th impedor R7, the 6th impedor R6, first
Triode V1, the second triode V2 and Schottky diode；One end of the 8th impedor R8 is connected with voltage vcc,
The other end is connected with the colelctor electrode of the second triode V2；The emitter stage of the second triode V2 and the one of the 7th impedor R7
End connection, the other end of the 7th impedor R7 is connected with one end of the 6th impedor R6, the 7th impedor
The connecting node of R7 and the 6th impedor R6 connects with the base stage of the 3rd triode V3 and the colelctor electrode of the 4th triode V4 respectively
Connect；The other end of the 6th impedor R6 is connected with the negative pole of Schottky diode, the positive pole difference of the Schottky diode
It is connected with the base stage of the second triode V2 and the emitter stage of the first triode V1, the base stage of the first triode V1 hinders with the 8th
The connecting node connection of the colelctor electrode of anti-element R8 and the second triode V2；The colelctor electrode of the first triode V1 is respectively with
Eight impedor R8 are connected with the connecting node of voltage vcc and the colelctor electrode of the 3rd triode V3.
The controllable Voltage stabilizing module 2 includes controllable source of stable pressure TL431, the first impedor R1 and the second impedor R2；
The node that the negative electrode of the controllable source of stable pressure TL431 is connected with the colelctor electrode of the 6th impedor R6 and the 4th triode V4 connects
Connect, the anode of the controllable source of stable pressure TL431 respectively with one end and one end of the second impedor R2 of the 5th impedor R5
Connection；The reference pole of the controllable source of stable pressure TL431 respectively with the other end and the first impedor R1 of the second impedor R2
One end connection；The other end of the first impedor R1 and the emitter stage of the 4th triode V4 and the 3rd impedor R3 connect
Connect node connection.
Operation principle of the invention：3rd impedor R3 is sampling resistor, when the load electric current is small, the 3rd triode
V3 is operated in amplification region, the 3rd triode V3 and controllable source of stable pressure composition decompression voltage regulator, the 3rd impedor R3 two ends
The electric current that voltage passes through to the 3rd impedor R3 is directly proportional, due to the 3rd triode V3 and the 4th triode V4 Ube substantially
It is equal, i.e. the pressure drop of the emitter stage of both base stages and triode；The voltage at the 4th impedor R4 two ends is no better than the 3rd
The voltage at impedor R3 two ends, the resistance with load reduces（Occurs partial short circuit in load）, cause the electric current in load
Increase, the pressure drop at the 4th impedor R4 two ends increases with the increase of the pressure drop at the 3rd impedor R3 two ends, by the
The partial pressure effect of four impedor R4 and the 5th impedor R5, the base level of the 4th triode V4 also constantly rises, but
Due to being provided with TL431, by its pressure stabilization function, the emitter stage level of the 4th triode V4 can be stablized in a value（Size is
2.5*（R1+R2）/ R2, in the present invention, the value of R1 and R2 is equal, i.e., can stablize in 5V）, when the base stage electricity of the 4th triode V4
Flat further up, the 4th triode V4 is gradually turned on, and now, the current-limiting circuit passes through the first triode V1, the pole of Schottky two
Pipe, the 6th impedor R6 circulations；First triode V1, the second triode V2, the 6th impedor R6, the 7th impedor
R7, the 8th impedor R8 and Schottky diode constitute a continuous current, Ib3（The base stage electricity of the 3rd triode V3
Stream）、Ib4（The base current of the 4th triode V4）And Ic4（The collector current of the 4th triode V4）Sum is constant, when
Ib3（The base current of the 3rd triode V3）Reduce, i.e. Ic3（The collector current of the 3rd triode V3）Reduce, the one or three pole
Pipe V1 and the second triode V2 are operated in amplification region, and the 8th impedor R8 is mainly and plays metering function, the 7th impedance element
Impedance on part R7 can be ignored, and the voltage stabilization of the 6th impedor R6 is in a value（The value is equal to（U2be- Xiao Te
The pressure drop of based diode, the i.e. base stage of the second triode V2 and the pressure drop of the pressure drop-Schottky diode of emitter stage, flow through the 6th
The current value of impedor R6 is equal to（The pressure drop of the base stage of the second triode V2 and the pressure drop-Schottky diode of emitter stage）Remove
With the resistance of the 6th impedor R6）, the electric current for flowing through that the current value of the 6th impedor R6 is equal in load is flowed through, i.e.,
The electric current for flowing through in final load is stabilized in a steady state value.
Embodiment two
The present embodiment is a kind of electric energy meter comprising current-limiting circuit described in embodiment one.
Below only highly preferred embodiment of the present invention is described, but is not to be construed as limiting the scope of the invention.This
Invention is not limited only to above example, and various changes made within the protection scope of the independent claims of the invention are at this
In the protection domain of invention.
Claims (7)
1. a kind of current-limiting circuit, including voltage（Vcc）, the 3rd impedor（R3）, the 4th impedor（R4）、
5th impedor（R5）, the 3rd triode（V3）With the 4th triode（V4）, it is characterised in that also including constant flow module
（1）With controllable Voltage stabilizing module（2）；
Described constant flow module（1）With an input and two output ends, constant flow module（1）Input and voltage
（Vcc）Connection, an output end and the 3rd triode of constant flow module（V3）Colelctor electrode connection, another output end is respectively with the 3rd
Triode（V3）Base stage and the 4th triode（V4）Colelctor electrode connection；
3rd triode（V3）Base stage and the 4th impedor（R4）One end connection, the 4th impedor（R4）It is another
One end and the 4th triode（V4）Base stage connection；
3rd triode（V3）Emitter stage and the 4th triode（V4）Emitter stage between connect the 3rd impedor
（R3）；
3rd impedor R3 and the 4th triode（V4）Emitter stage connection node and controllable Voltage stabilizing module（2）Connection, it is permanent
Flow module（1）Output end and the 4th triode（V4）Colelctor electrode connection node and controllable Voltage stabilizing module（2）Benchmark electricity
Pressure output end connection, the controllable Voltage stabilizing module（2）Output end on be connected to load；
4th impedor（R4）With the 4th triode（V4）Base stage connecting node pass through the 5th impedor（R5）
Ground connection.
2. current-limiting circuit according to claim 1, it is characterised in that：The constant flow module（1）Including the 8th impedor
（R8）, the first triode（V1）And second triode（V2）；
8th impedor（R8）One end and voltage（Vcc）Connection, the other end and the second triode（V2）Colelctor electrode
Connection；First triode（V1）Base stage and the 8th impedor（R8）With the second triode（V2）Colelctor electrode connection
Node is connected；First triode（V1）Colelctor electrode respectively with the 8th impedor（R8）With voltage（Vcc）Connection section
Point and the 3rd triode（V3）Colelctor electrode connection；First triode（V1）Emitter stage and the second triode（V2）Base
Pole and the second triode（V2）Emitter stage connecting node connection.
3. the current-limiting circuit according to profit requires 2, it is characterised in that：Described constant flow module（1）Also include a Schottky two
Pole pipe；The Schottky diode is serially connected in the first triode（V1）Emitter stage and the second triode（V2）Base stage and second
Triode（V2）Emitter stage connecting node between.
4. current-limiting circuit according to claim 3, it is characterised in that：Described constant flow module（1）Also include the 6th impedance
Element（R6）；6th impedor（R6）It is serially connected in Schottky diode and the second triode（V2）Emitter stage between；
6th impedor（R6）One end be connected with the negative pole of Schottky diode, the other end and the second triode（V2）Hair
Emitter-base bandgap grading is connected.
5. current-limiting circuit according to claim 4, it is characterised in that：Described constant flow module（1）Also include the 7th impedance
Element（R7）；7th impedor（R7）It is serially connected in the 6th impedor（R6）With the second triode（V2）Emitter stage it
Between, the 7th impedor（R7）One end and impedor（R6）Connection, the other end and the second triode（V2）Transmitting
Pole connects.
6. current-limiting circuit according to claim 5, it is characterised in that：Described controllable Voltage stabilizing module（2）Including controllable steady
Potential source（TL431）, the first impedor（R1）With the second impedor（R2）；
The controllable source of stable pressure（TL431）Negative electrode and the 6th impedor（R6）With the 4th triode（V4）Colelctor electrode connection
Node connection, the controllable source of stable pressure（TL431）Anode respectively with the 5th impedor（R5）One end and the second impedance
Element（R2）One end connection；
Controllable source of stable pressure（TL431）Reference pole respectively with the second impedor（R2）The other end and the first impedor（R1）
One end connection；First impedor（R1）The other end and the 4th triode（V4）Emitter stage and the 3rd impedor（R3）
Connecting node is connected.
7. a kind of electric energy meter, comprising current-limiting circuit, it is characterised in that described current-limiting circuit is any one of claim 1-6 institute
The current-limiting circuit stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611262628.4A CN106786441B (en) | 2016-12-30 | 2016-12-30 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611262628.4A CN106786441B (en) | 2016-12-30 | 2016-12-30 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106786441A true CN106786441A (en) | 2017-05-31 |
| CN106786441B CN106786441B (en) | 2018-12-11 |
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| CN201611262628.4A Active CN106786441B (en) | 2016-12-30 | 2016-12-30 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109309381A (en) * | 2017-07-27 | 2019-02-05 | 炬芯（珠海）科技有限公司 | Current-limiting circuit and current-limiting method |
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Also Published As
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| CN106786441B (en) | 2018-12-11 |
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Address after: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Patentee after: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY LIMITED ELECTRIC POWER Research Institute Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Address before: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID ZHEJIANG ELECTRIC POWER Co. Patentee before: State Grid Corporation of China Patentee before: STATE GRID ZHEJIANG ELECTRIC POWER Co. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20220316 Address after: 311100 Building 5, 138 Yunlian Road, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Marketing service center of State Grid Zhejiang Electric Power Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. Address before: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Patentee before: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY LIMITED ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA Patentee before: STATE GRID ZHEJIANG ELECTRIC POWER Co.,Ltd. |