CN203465345U - External voltage automatic detection and alarm circuit - Google Patents
External voltage automatic detection and alarm circuit Download PDFInfo
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- CN203465345U CN203465345U CN201320573997.0U CN201320573997U CN203465345U CN 203465345 U CN203465345 U CN 203465345U CN 201320573997 U CN201320573997 U CN 201320573997U CN 203465345 U CN203465345 U CN 203465345U
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- divider resistance
- triode
- external power
- power source
- output terminal
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Abstract
The utility model provides an external voltage automatic detection and alarm circuit. The external voltage automatic detection and alarm circuit comprises an on-off element which is connected with the output end of an external power source and controlled by the external power source to realize the on/off state and an indicating element for indicating the state. The on-off element is a transistor T1. The indicating element is a light-emitting diode D2. According to the utility model, the transistor is used to perform real-time monitoring on an external voltage, and the light-emitting diode is used to display the monitoring result, so the external voltage automatic detection and alarm circuit can be used to effectively prevent the condition that a battery management system fails to work due to a low external power supply voltage, and provide a simple and simple method for the failure judgment and exclusion of the battery management system. The circuit has advantages of simple structure, low element cost and strong practicability.
Description
Technical field
The utility model relates to battery management system field, is that a kind of external voltage detects and warning circuit automatically specifically.
Background technology
The operating voltage of battery management system be by outside one independently accumulator supply, if battery tension is too low, will cause battery management system cannot work (when voltage is during lower than 9V, system cannot be worked).Current battery management system does not also detect and early warning outside supply voltage, if after this abnormal appearance, we cannot directly observe out, will to maintenance work, bring very large puzzlement.
Summary of the invention
For above-mentioned prior art, the technical matters that the utility model solves is to provide a kind of external voltage and automatically detects and warning circuit.
In order to solve the problems of the technologies described above, external voltage of the present utility model detects and warning circuit automatically, be used for being connected in external power source output terminal, comprise that one is connected with external power source output terminal Vdd and is controlled and realized the on-off element of break-make and the indicator elment of indicating status by external power source, this on-off element is triode T1, external power source output terminal is connected with the base stage of triode T1 as the control end of controlling triode T1 break-make, the emitter and collector of triode T1 is connected with external power source output terminal and earth terminal respectively, this indicator elment is light emitting diode D2, this light emitting diode D2 is connected between emitter and collector.
As further improvement of the utility model, described circuit comprises the first divider resistance R1, the second divider resistance R2 and tri-divider resistances of the 3rd divider resistance R3 and voltage stabilizing diode D1, the first divider resistance R1 and the 3rd divider resistance R3 access in parallel external power source output terminal, this first divider resistance R1 connects with voltage stabilizing diode D1, the base stage access in parallel voltage stabilizing diode D1 of the second divider resistance R2 and triode T1, the collector earth of this second divider resistance R2 and triode T1, light emitting diode D2 access three divider resistance R3 in parallel with triode T1.
The utility model automatically detects and reports to the police external voltage and can reach the real-time control to external voltage, prevent that externally fed brownout from causing battery management system to work, also for the judgement of battery management system fault with get rid of the method that provides simple and reliable.This circuit structure is simple, and element is with low cost, has stronger practicality.
Accompanying drawing explanation
Fig. 1 is expressed as the circuit diagram that the utility model is implemented.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Circuit diagram of the present utility model as shown in Figure 1, this circuit is used for being connected in external power source output terminal, the first divider resistance R1 and the 3rd divider resistance R3 access in parallel external power source output terminal, this first divider resistance R1 connects with the anode of voltage stabilizing diode D1, voltage stabilizing diode D1 negative electrode accesses the second divider resistance R2 circuit in parallel with the base stage of triode T1, the collector earth of this second divider resistance R2 and triode T1, the anode of other end connecting luminous diode D2 of the 3rd divider resistance R3 and the emitter parallel circuit of triode T1, the collector of triode T1, the output terminal earth of the negative electrode of light emitting diode and the second resistance.
A fixing magnitude of voltage of setting by voltage stabilizing diode D1 as above, described triode T1 is that NPN type triode is used the break-make that realizes electric current in circuit as on-off element, described light emitting diode D2 is used as LED lamp, and whether indication external voltage is lower than the minimum voltage threshold values of setting.
The voltage of setting voltage stabilizing diode D1 is 9V, when external power source output terminal Vdd is greater than minimum voltage threshold values 9V, now the voltage between the collector and emitter of triode is very little, the conducting state that is equivalent to switch between collector and emitter, and the voltage at light emitting diode D2 two ends is lower than forward voltage, therefore light emitting diode does not work.When external power source output terminal Vdd is less than minimum voltage threshold values 9V, now the voltage between the collector and emitter of triode is very large, the off-state that is equivalent to switch between collector and emitter, and the voltage at light emitting diode D2 two ends is greater than forward voltage, therefore light emitting diode is bright, and alarm external voltage is too low.
It is more than preferably implementation of the utility model; it should be noted that; in the situation that not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the utility model, but these changes and distortion all should belong to the protection domain of the appended claim of the utility model.
Claims (2)
1. an external voltage detects and warning circuit automatically, be connected in external power source output terminal, it is characterized in that, comprise that one is connected with external power source output terminal and is controlled and realized the on-off element of break-make and the indicator elment of indicating status by external power source, this on-off element is triode T1, external power source output terminal is connected with the base stage of triode T1 as the control end of controlling triode T1 break-make, the emitter and collector of triode T1 is connected with external power source output terminal and earth terminal respectively, this indicator elment is light emitting diode D2, this light emitting diode D2 is connected between emitter and collector.
2. external voltage according to claim 1 detects and warning circuit automatically, it is characterized in that, described circuit comprises the first divider resistance R1, the second divider resistance R2 and tri-divider resistances of the 3rd divider resistance R3 and voltage stabilizing diode D1, the first divider resistance R1 and the 3rd divider resistance R3 access in parallel external power source output terminal, this first divider resistance R1 connects with voltage stabilizing diode D1, the base stage access in parallel voltage stabilizing diode D1 of the second divider resistance R2 and triode T1, the collector earth of this second divider resistance R2 and triode T1, light emitting diode D2 access three divider resistance R3 in parallel with triode T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573997.0U CN203465345U (en) | 2013-09-17 | 2013-09-17 | External voltage automatic detection and alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573997.0U CN203465345U (en) | 2013-09-17 | 2013-09-17 | External voltage automatic detection and alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203465345U true CN203465345U (en) | 2014-03-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320573997.0U Expired - Lifetime CN203465345U (en) | 2013-09-17 | 2013-09-17 | External voltage automatic detection and alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203465345U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048606A (en) * | 2015-09-16 | 2015-11-11 | 上海德朗能动力电池有限公司 | Battery discharge protection circuit and rechargeable battery pack with discharge protection function |
| CN114523998A (en) * | 2022-01-13 | 2022-05-24 | 通号万全信号设备有限公司 | Novel LED route indicator |
-
2013
- 2013-09-17 CN CN201320573997.0U patent/CN203465345U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048606A (en) * | 2015-09-16 | 2015-11-11 | 上海德朗能动力电池有限公司 | Battery discharge protection circuit and rechargeable battery pack with discharge protection function |
| CN114523998A (en) * | 2022-01-13 | 2022-05-24 | 通号万全信号设备有限公司 | Novel LED route indicator |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140305 |
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| CX01 | Expiry of patent term |