CN206283249U - 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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- CN206283249U CN206283249U CN201621490298.XU CN201621490298U CN206283249U CN 206283249 U CN206283249 U CN 206283249U CN 201621490298 U CN201621490298 U CN 201621490298U CN 206283249 U CN206283249 U CN 206283249U
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Abstract
A kind of electric energy meter the utility model 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 present utility model 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.The utility model has the advantages 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 utility model is related 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.
Utility model content
The technical problems to be solved in the utility model is the defect for overcoming above-mentioned prior art to exist, there is provided one kind can be real
Existing current limliting and the less current-limiting circuit of oneself power consumption and the electric energy meter comprising the current-limiting circuit, are beneficial to circuit and electric energy meter are long
Phase stably works.
In order to solve the above technical problems, the technical solution adopted in the utility model is：A kind of current-limiting circuit, including voltage,
Constant flow module, controllable Voltage stabilizing module, the 3rd impedor, the 4th impedor, the 5th impedor, the 3rd triode and the 4th
Triode；
Described constant flow module has an input and two output ends, and 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, another output end respectively with the base stage of the 3rd triode and
The colelctor electrode connection of the 4th triode；The base stage of the 3rd triode is connected with one end of the 4th impedor, the 4th impedance
The other end of element is connected with the base stage of the 4th triode；The emitter stage of the 3rd triode and the emitter stage of the 4th triode
Between connect the 3rd impedor；Node and controllable Voltage stabilizing module that 3rd impedor is connected with the emitter stage of the 4th triode
Connection, the output end of constant flow module is defeated with the reference voltage of controllable Voltage stabilizing module with the node that the colelctor electrode of the 4th triode is connected
Go out end connection, load is connected in the output end of the controllable Voltage stabilizing module；The base of the 4th impedor and the 4th triode
The connecting node of pole is grounded by the 5th impedor.
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 that the utility model is used for：A kind of electric energy meter, comprising above-mentioned current-limiting circuit.
The utility model compared with prior art, with advantages below：After the electric current in load increases, can trigger point
Pressure, i.e., it is final to cause that the electric current flowed through in load reduces by the 4th impedor and the 5th impedor, and it is stabilized in one
Individual 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
Make.
Brief description of the drawings
Fig. 1 is the overall structure diagram of prior art；
Fig. 2 is the structural representation of the utility model embodiment one；
Fig. 3 is the contrast effect figure of the utility model embodiment one and existing GPF (General Protection False circuit；
Fig. 4 is the power consumption schematic diagram of the utility model embodiment one.
Described in figure, 1, constant flow module；2nd, controllable Voltage stabilizing module.
Specific embodiment
The utility model is described in further detail with reference to Figure of description.
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 present utility model：3rd impedor R3 is sampling resistor, when the load electric current is small, the three or three
Pole pipe 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
The electric current that the voltage at end passes through to the 3rd impedor R3 is directly proportional, due to the Ube of the 3rd triode V3 and the 4th triode V4
It is roughly 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 voltage at the 3rd impedor R3 two ends, the resistance with load reduces（Occurs partial short circuit in load）, cause in load
Electric current increases, and 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, leads to
The partial pressure effect of the 4th impedor R4 and the 5th impedor R5 is crossed, 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（Greatly
Small is 2.5*（R1+R2）/ R2, in the utility model, the value of R1 and R2 is equal, i.e., can stablize in 5V）, as the 4th triode V4
Base level it is further up, the 4th triode V4 is gradually turned on, now, the current-limiting circuit pass through the first triode V1, Xiao
Special based diode, the 6th impedor R6 circulations；First triode V1, the second triode V2, the 6th impedor R6, the 7th resistance
Anti- element R7, the 8th impedor R8 and Schottky diode constitute a continuous current, Ib3（3rd triode V3's
Base current）、Ib4（The base current of the 4th triode V4）And Ic4（The collector current of the 4th triode V4）Sum is permanent
It is fixed, work as Ib3（The base current of the 3rd triode V3）Reduce, i.e. Ic3（The collector current of the 3rd triode V3）Reduce, first
Triode V1 and the second triode V2 are operated in amplification region, and the 8th impedor R8 is mainly and plays metering function, the 7th resistance
Impedance on anti-element R7 can be ignored, and the voltage stabilization of the 6th impedor R6 is in a value（The value is equal to（U2be-
The pressure drop of Schottky 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 current value of the 6th impedor R6 is equal to（The pressure of the base stage of the second triode V2 and the pressure drop-Schottky diode of emitter stage
Drop）Divided by the resistance of the 6th impedor R6）, flow through the electricity for flowing through that the current value of the 6th impedor R6 is equal in load
Stream, 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 most preferred embodiment of the present utility model is described, but is not to be construed as the limit to claim
System.The utility model is not limited only to above example, all to be made in the protection domain of the utility model independent claims
Various change is in protection domain of the present utility model.
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）With the 4th triode（V4）Emitter stage connection node and controllable Voltage stabilizing module（2）Connection,
Constant flow module（1）Output end and the 4th triode（V4）Colelctor electrode connection node and controllable Voltage stabilizing module（2）Benchmark
Voltage output end is connected, 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 |
|---|---|---|---|
| CN201621490298.XU CN206283249U (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 |
|---|---|---|---|
| CN201621490298.XU CN206283249U (en) | 2016-12-30 | 2016-12-30 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206283249U true CN206283249U (en) | 2017-06-27 |
Family
ID=59071986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621490298.XU Withdrawn - After Issue CN206283249U (en) | 2016-12-30 | 2016-12-30 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206283249U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786441A (en) * | 2016-12-30 | 2017-05-31 | 国网浙江省电力公司电力科学研究院 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
| CN110890839A (en) * | 2018-09-11 | 2020-03-17 | 深圳市国王科技有限公司 | Voltage regulating circuit based on silicon controlled rectifier |
-
2016
- 2016-12-30 CN CN201621490298.XU patent/CN206283249U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786441A (en) * | 2016-12-30 | 2017-05-31 | 国网浙江省电力公司电力科学研究院 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
| CN106786441B (en) * | 2016-12-30 | 2018-12-11 | 国网浙江省电力公司电力科学研究院 | A kind of current-limiting circuit and the electric energy meter comprising the current-limiting circuit |
| CN110890839A (en) * | 2018-09-11 | 2020-03-17 | 深圳市国王科技有限公司 | Voltage regulating circuit based on silicon controlled rectifier |
| CN110890839B (en) * | 2018-09-11 | 2023-12-26 | 深圳市国王科技有限公司 | Voltage regulating circuit based on silicon controlled rectifier |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170627 Effective date of abandoning: 20181211 |