CN204719168U - A kind of current anomaly checking circuit - Google Patents
A kind of current anomaly checking circuit Download PDFInfo
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- CN204719168U CN204719168U CN201520454282.2U CN201520454282U CN204719168U CN 204719168 U CN204719168 U CN 204719168U CN 201520454282 U CN201520454282 U CN 201520454282U CN 204719168 U CN204719168 U CN 204719168U
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Abstract
The utility model discloses a kind of current anomaly checking circuit, for testing and instruction to current conditions to be measured, comprising: electric current incoming end to be measured, diode, triode, indicator, inspection electric current incoming end and sys node; Inspection electric current incoming end connects sys node; Sys node is by indicator ground connection, and by triode ground connection, transistor base connects diode cathode and by pull-up resistor ground connection, diode cathode connects electric current incoming end to be measured; When triode cut-off, sys node voltage provides operating voltage for indicator.In a kind of current anomaly checking circuit that the utility model proposes, indicator can indicate the abnormal conditions of electric current to be measured.When rear end equipment heavier loads, even when short circuit, warning and abnormal instruction can be in abnormal work by this equipment of reminding user, need client to check the loading condition of rear end equipment, also can well protect rear end equipment and guide rail power supply.
Description
Technical field
The utility model relates to current detection technology field, particularly relates to a kind of current anomaly checking circuit.
Background technology
Along with electricity is applicable universal, various power supply emerges in an endless stream, but the electrical part often more accurate complexity of structure, and its functional reliability and the stable of electric current have much relations, so, extremely important to the real-time detection of electric current during electric energy application.
As shown in Figure 1, guide rail power supply is in the market provided with testing circuit more, to detect the situation of guide rail electric power outputting current in real time.But guide rail power supply on the market only has the normal instruction of output usually, and when output abnormality or short circuit time, green light can glimmer and even not light, alarm free function.In practical application, if output load short circuit, in heavy duty situation, indicating from a green light is separately to judge whether the work of power supply exists the abnormal conditions such as overvoltage or big current, if under being in load short circuits or heavy duty situation for a long time, guide rail power supply may damage, and rear end equipment also may be damaged.
Utility model content
Based on the technical matters that background technology exists, the utility model proposes a kind of current anomaly checking circuit.
A kind of current anomaly checking circuit that the utility model proposes, for testing and instruction to current conditions to be measured, comprising: electric current incoming end to be measured, diode, triode, indicator, inspection electric current incoming end and sys node;
Inspection electric current incoming end connects sys node; Sys node is by indicator ground connection, and by triode ground connection, transistor base connects diode cathode and by pull-up resistor ground connection, diode cathode connects electric current incoming end to be measured; When triode cut-off, sys node voltage provides operating voltage for indicator.
Preferably, triode is NPN triode, sys node connecting triode collector, transistor emitter ground connection.
Preferably, indicator is LED, and sys node connects LED positive pole, LED minus earth.
Preferably, diode model is MMSZ5249.
Preferably, check between electric current incoming end and sys node and be in series with the first current-limiting resistance.
Preferably, amplifying circuit is connected with between the first current-limiting resistance and sys node.
Preferably, amplifying circuit is NPN triode, and its collector connects the first current-limiting resistance, and its base stage connects its collector by divider resistance, and its emitter connects sys node.
Preferably, amplifying circuit is NPN type compound transistor.
Preferably, NPN type compound transistor is made up of the first triode and the second triode, and the first triode and the second triode are NPN triode; The collector of the first triode connects the first current-limiting resistance, and the base stage of the first triode is with the collector short circuit of the second triode and be connected the collector of the first triode by divider resistance, and the emitter of the first triode connects the second transistor emitter; Second transistor base connects the emitter of the first triode, and the emitter of the second triode connects sys node.
Preferably, protective resistance is connected with between the first transistor emitter and the second transistor emitter.
In a kind of current anomaly checking circuit that the utility model proposes, indicator can indicate the abnormal conditions of electric current to be measured.When rear end equipment heavier loads, even when short circuit, warning and abnormal instruction can be in abnormal work by this equipment of reminding user, need client to check the loading condition of rear end equipment, also can well protect rear end equipment and guide rail power supply.
Size to electric current to be measured can predict in conjunction with diode reverse breakdown current value and indicator working condition in the utility model, more detailed understanding current conditions to be measured.
The utility model peripheral component is few, and circuit is simple, reasonable in design, is conducive to improving cost performance.
Accompanying drawing explanation
Fig. 1 is a kind of guide rail power module schematic diagram;
Fig. 2 is a kind of current anomaly checking circuit schematic diagram that the utility model proposes.
Embodiment
With reference to Fig. 2, a kind of current anomaly checking circuit that the utility model proposes, for testing and instruction to current conditions to be measured, it comprises: electric current incoming end B to be measured, diode D1, triode Q1, indicator, inspection electric current incoming end A, the first current-limiting resistance R3, amplifying circuit and sys node C.
Inspection electric current incoming end A, the first current-limiting resistance R3, amplifying circuit, sys node C connect successively.
Amplifying circuit is NPN triode, is specially NPN type compound transistor, and it forms by by the first triode Q2 and the second triode Q3, and the first triode Q2 and the second triode Q3 is NPN triode.The collector of the first triode Q2 connects the first current-limiting resistance R3 as the collector of compound transistor, the base stage of the first triode Q2 as compound transistor base stage and connected the collector of the first triode Q2 by divider resistance R5, the collector of the second triode Q3 is connected with the base stage short circuit of the first triode Q2, and the emitter of the first triode Q2 connects the second triode Q3 emitter.Second triode Q3 base stage connects the emitter of the first triode Q2, and the emitter of the second triode Q3 connects sys node C as the emitter of compound transistor Q1.
The application of compound transistor, adds current amplification factor, can meet significant power demand, and can reduce the size of inspection electric current VDD further, and improve safety coefficient, in addition, compound transistor fast response time, is conducive to increasing work efficiency.
Sys node C by indicator ground connection PGND, and passes through triode Q1 ground connection PGND.Particularly, indicator is LED, and sys node C connects LED positive pole, LED minus earth.Triode Q1 is NPN triode, sys node C connecting triode Q1 collector, triode Q1 grounded emitter.Triode Q1 base stage connects diode D1 positive pole and by pull-up resistor R2 ground connection, diode D1 negative pole connects electric current incoming end B to be measured by the second current-limiting resistance R1.Diode D1 model is MMSZ5249, and the second current-limiting resistance R1 provides current-limiting protection to circuit.
Inspection electric current incoming end A for accessing inspection electric current VDD, inspection electric current VDD after the first current-limiting resistance and amplifying circuit from sys node C through indicator or triode Q1 to ground.The setting of the first current-limiting resistance R3 can avoid that inspection electric current VDD is excessive causes damage to subsequent element, and amplifying circuit amplifies inspection electric current VDD, can ensure
Electric current incoming end B to be measured accesses electric current VCC to be measured, when electric current VCC to be measured reaches the reverse breakdown current ratings of diode D1, diode D1 is reversed and punctures, triode Q1 base stage produces high level, triode Q1 conducting, thus sys node C electric current passes through triode Q1 to ground, LED no current flows through, and is in off position; When electric current VCC to be measured is less than diode D1 reverse breakdown current, diode D1 cannot be switched on, and triode Q1 base stage is low level, triode Q1 ends, sys node C electric current is by LED to ground, and it is luminous that LED obtains electricity work, thus indicate the abnormal conditions of electric current to be measured.
In present embodiment, by the selection to diode D1, can predict in conjunction with diode D1 reverse breakdown current value and the LED light size of situation to electric current to be measured that flicker, the excessive infringement brought of the electric current avoiding the factors such as short circuit to cause.
In present embodiment, between the first triode Q2 emitter and the second triode Q3 emitter, be connected with protective resistance 4, impact to avoid the voltage of output to sys node C of the first triode Q2 emitter.
During a kind of current anomaly checking circuit embody rule that present embodiment provides, in circuit, the selection of each element should consider the magnitude of voltage that electric current incoming end B to be measured may occur, avoids causing damage to follow-up components and parts.
The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, all should be encompassed within protection domain of the present utility model.
Claims (10)
1. a current anomaly checking circuit, for testing and instruction to current conditions to be measured, it is characterized in that, comprising: electric current incoming end (B) to be measured, diode (D1), triode (Q1), indicator, inspection electric current incoming end (A) and sys node (C);
Inspection electric current incoming end (A) connects sys node (C); Sys node (C) is by indicator ground connection, and by triode (Q1) ground connection, triode (Q1) base stage connects diode (D1) positive pole and by pull-up resistor (R2) ground connection, diode (D1) negative pole connects electric current incoming end (B) to be measured; When triode (Q1) cut-off, sys node (C) voltage provides operating voltage for indicator.
2. current anomaly checking circuit as claimed in claim 1, it is characterized in that, triode (Q1) is NPN triode, sys node (C) connecting triode (Q1) collector, triode (Q1) grounded emitter.
3. current anomaly checking circuit as claimed in claim 1, it is characterized in that, indicator is LED, and sys node (C) connects LED positive pole, LED minus earth.
4. current anomaly checking circuit as claimed in claim 1, it is characterized in that, diode (D1) model is MMSZ5249.
5. current anomaly checking circuit as claimed in claim 1, is characterized in that, is in series with the first current-limiting resistance (R3) between inspection electric current incoming end (A) and sys node (C).
6. current anomaly checking circuit as claimed in claim 5, is characterized in that, be connected with amplifying circuit between the first current-limiting resistance (R3) and sys node (C).
7. current anomaly checking circuit as claimed in claim 6, it is characterized in that, amplifying circuit is NPN triode, its collector connects the first current-limiting resistance (R3), its base stage connects its collector by divider resistance (R5), and its emitter connects sys node (C).
8. current anomaly checking circuit as claimed in claim 7, it is characterized in that, amplifying circuit is NPN type compound transistor.
9. current anomaly checking circuit as claimed in claim 8, it is characterized in that, NPN type compound transistor is made up of the first triode (Q2) and the second triode (Q3), and the first triode (Q2) and the second triode (Q3) are NPN triode; The collector of the first triode (Q2) connects the first current-limiting resistance (R3), the base stage of the first triode (Q2) and the collector short circuit of the second triode (Q3) are also connected the collector of the first triode (Q2) by divider resistance (R5), the emitter of the first triode (Q2) connects the second triode (Q3) emitter; Second triode (Q3) base stage connects the emitter of the first triode (Q2), and the emitter of the second triode (Q3) connects sys node (C).
10. current anomaly checking circuit as claimed in claim 9, is characterized in that, be connected with protective resistance (4) between the first triode (Q2) emitter and the second triode (Q3) emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520454282.2U CN204719168U (en) | 2015-06-26 | 2015-06-26 | A kind of current anomaly checking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520454282.2U CN204719168U (en) | 2015-06-26 | 2015-06-26 | A kind of current anomaly checking circuit |
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| CN204719168U true CN204719168U (en) | 2015-10-21 |
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| CN201520454282.2U Active CN204719168U (en) | 2015-06-26 | 2015-06-26 | A kind of current anomaly checking circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093053A (en) * | 2015-06-26 | 2015-11-25 | 天长市富安电子有限公司 | Current abnormity detection circuit |
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2015
- 2015-06-26 CN CN201520454282.2U patent/CN204719168U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093053A (en) * | 2015-06-26 | 2015-11-25 | 天长市富安电子有限公司 | Current abnormity detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Current abnormity detection circuit Effective date of registration: 20200420 Granted publication date: 20151021 Pledgee: Tianchang Science and Technology Financing Guarantee Co., Ltd. Pledgor: TIANCHANG FUAN ELECTRONIC Co.,Ltd. Registration number: Y2020980001630 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210413 Granted publication date: 20151021 Pledgee: Tianchang Science and Technology Financing Guarantee Co.,Ltd. Pledgor: TIANCHANG FUAN ELECTRONIC Co.,Ltd. Registration number: Y2020980001630 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A circuit for checking abnormal current Effective date of registration: 20210422 Granted publication date: 20151021 Pledgee: Tianchang Science and Technology Financing Guarantee Co.,Ltd. Pledgor: TIANCHANG FUAN ELECTRONIC Co.,Ltd. Registration number: Y2021980002896 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220507 Granted publication date: 20151021 Pledgee: Tianchang Science and Technology Financing Guarantee Co.,Ltd. Pledgor: TIANCHANG FUAN ELECTRONIC Co.,Ltd. Registration number: Y2021980002896 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |