CN209215474U - A kind of under-voltage warning circuit with hysteresis - Google Patents
A kind of under-voltage warning circuit with hysteresis Download PDFInfo
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- CN209215474U CN209215474U CN201821859404.6U CN201821859404U CN209215474U CN 209215474 U CN209215474 U CN 209215474U CN 201821859404 U CN201821859404 U CN 201821859404U CN 209215474 U CN209215474 U CN 209215474U
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Abstract
The utility model discloses a kind of under-voltage warning circuit with hysteresis, including sampling resistor R1, sampling resistor R2, sampling resistor R3, source of stable pressure D1, resistance R4, resistance R5, resistance R6, triode Q1, resistance R7, resistance R8, resistance R9, optocoupler PC1 and resistance R10.When source of stable pressure D1 is higher than reference voltage with reference to voltage at pole, source of stable pressure D1 cathode exports low level, and triode Q1 is not turned on, and optocoupler PC1 does not work；When source of stable pressure D1 is lower than reference voltage with reference to voltage at pole, cathode exports high level, triode Q1 conducting, and optocoupler PC1 cathode drags down, and primary side lights, and emitter exports high level；When triode Q1 conducting, resistance R7 is in parallel with resistance R1, resistance R2, improves battery undervoltage alarm voltage, and voltage hysteresis effectively prevents undervoltage alarm malfunction.The utility model structure is simple, at low cost, reliable and stable.
Description
Technical field
The utility model relates to field of switch power more particularly to a kind of under-voltage warning circuits with hysteresis.
Background technique
With the improvement of people's living standards, smart home also more and more enters people's lives, in smart home
In field, Switching Power Supply uses more and more frequent.Switching Power Supply is made of switch controller and power stage circuit, switch control
Device makes Switching Power Supply output substantially constant output signal supply by the switch state of the main power tube in control power stage circuit
Load.However, supplying cell voltage drops to when needing to charge, it cannot find, battery undervoltage situation can not be reported in time
It is alert, it often will so influence whether the normal use and service life of battery.
Utility model content
The purpose of this utility model is that by a kind of under-voltage warning circuit with hysteresis, to solve background above skill
The problem of art part is mentioned.
For this purpose, the utility model uses following technical scheme:
A kind of under-voltage warning circuit with hysteresis, the circuit include sampling resistor R1, sampling resistor R2, sampling resistor
R3, source of stable pressure D1, resistance R4, resistance R5, resistance R6, triode Q1, resistance R7, resistance R8, resistance R9, optocoupler PC1 and electricity
Hinder R10；Wherein, the sun of one end of the sampling resistor 1 and one end of sampling resistor R2, battery cathode end BAT-, source of stable pressure D1
The other end of the emitter connection of pole, one end of resistance R6, triode Q1, the other end of sampling resistor R1 and sampling resistor R2,
The reference pole connection of one end of sampling resistor R3, one end of resistance R7, source of stable pressure D1, the other end and battery of sampling resistor R3 is just
One end connection of extreme BAT+, one end of resistance R8, resistance R4, the other end of resistance R7 and collector, the resistance of triode Q1
The cathode connection of one end, optocoupler PC1 of R9, the other end and the other end of resistance R9, one end of resistance R10, optocoupler of resistance R8
The anode connection of PC1, the other end of resistance R4 are connect with one end of the cathode of source of stable pressure D1, resistance R5, the other end of resistance R5
It is connect with the base stage of the other end of resistance R6, triode Q1, the other end of resistance R10 is connect with the collector of optocoupler PC1.
Particularly, the source of stable pressure D1 uses controllable accurate source of stable pressure TL431.
The utility model proposes the under-voltage warning circuit with hysteresis be higher than base with reference to voltage at pole in source of stable pressure D1
When quasi- voltage, source of stable pressure D1 cathode exports low level, and triode Q1 is not turned on, and optocoupler PC1 does not work；When source of stable pressure D1 is with reference at pole
When voltage is lower than reference voltage, source of stable pressure D1 cathode exports high level, triode Q1 conducting, and optocoupler PC1 cathode drags down, optocoupler
PC1 primary side lights, and optocoupler PC1 emitter exports high level；When triode Q1 conducting, resistance R7 and resistance R1, resistance R2 are simultaneously
Connection, improves battery undervoltage alarm voltage, and voltage hysteresis effectively prevents undervoltage alarm malfunction.The utility model can be in electricity
Alarm is issued when pond is under-voltage in time, and structure is simple, it is at low cost, it is reliable and stable.
Detailed description of the invention
Fig. 1 is the under-voltage warning circuit structure chart provided by the embodiment of the utility model with hysteresis.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms in fact
It is existing, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes public affairs to the utility model
Open the more thorough and comprehensive of content understanding.It should be noted that it can when an element is considered as " connection " another element
To be directly to another element or may be simultaneously present centering elements.Unless otherwise defined, institute used herein
Some technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs.Herein
In term used in the description of the utility model be only for the purpose of describing specific embodiments and be not intended to
Limit the utility model.Term " and or " used herein include the arbitrary of one or more relevant listed items and
All combinations.
It please refers to shown in Fig. 1, Fig. 1 is the under-voltage warning circuit structure provided by the embodiment of the utility model with hysteresis
Figure.
Under-voltage warning circuit in the present embodiment with hysteresis specifically includes sampling resistor R1, sampling resistor R2, sampling
Resistance R3, source of stable pressure D1, resistance R4, resistance R5, resistance R6, triode Q1, resistance R7, resistance R8, resistance R9, optocoupler PC1 with
And resistance R10.Wherein, one end of the sampling resistor 1 and one end of sampling resistor R2, battery cathode end BAT-, source of stable pressure D1
Anode, one end of resistance R6, triode Q1 emitter connection, the other end of sampling resistor R1 is another with sampling resistor R2's
The reference pole connection at end, one end of sampling resistor R3, one end of resistance R7, source of stable pressure D1, the other end and electricity of sampling resistor R3
The collector of one end connection of pond positive terminal BAT+, one end of resistance R8, resistance R4, the other end of resistance R7 and triode Q1,
The other end of the cathode connection of one end of resistance R9, optocoupler PC1, the other end of resistance R8 and resistance R9, resistance R10 one end,
The anode connection of optocoupler PC1, the other end of resistance R4 are connect with one end of the cathode of source of stable pressure D1, resistance R5, and resistance R5's is another
One end is connect with the base stage of the other end of resistance R6, triode Q1, and the other end of resistance R10 is connect with the collector of optocoupler PC1.
The source of stable pressure D1 uses controllable accurate source of stable pressure TL431 in the present embodiment.
When work, when source of stable pressure D1 is higher than reference voltage with reference to voltage at pole, source of stable pressure D1 cathode exports low level, and three
Pole pipe Q1 is not turned on, and optocoupler PC1 does not work；When source of stable pressure D1 is lower than reference voltage with reference to voltage at pole, source of stable pressure D1 cathode is defeated
High level out, triode Q1 conducting, optocoupler PC1 cathode drag down, and optocoupler PC1 primary side lights, the high electricity of optocoupler PC1 emitter output
It is flat；When triode Q1 conducting, resistance R7 is in parallel with resistance R1, resistance R2, improves battery undervoltage alarm voltage, and voltage is stagnant
It returns, effectively prevents undervoltage alarm malfunction.
The technical solution of the utility model, to battery voltage sampling, works as sampled voltage using precision digital and Adjustable TL431
When lower than accurate digital and Adjustable TL431 reference voltage, accurate digital and Adjustable TL431 cathode goes out high level, is triode Q1
Base stage provides electric current, and triode Q1 conducting, optocoupler PC1 primary side is bright, optocoupler PC1 pair side outputting alarm signal.When cell voltage exists
When near undervoltage alarm point, to prevent undervoltage alarm malfunction, voltage hysteresis route is increased.The utility model is low in output voltage
When under-voltage, electric power output voltage alarm signal is easy to implement the intelligence effectively management of entire terminal system power supply.This is practical
New structure is simple, at low cost, reliable and stable.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (2)
1. a kind of under-voltage warning circuit with hysteresis, which is characterized in that including sampling resistor R1, sampling resistor R2, sampling
Resistance R3, source of stable pressure D1, resistance R4, resistance R5, resistance R6, triode Q1, resistance R7, resistance R8, resistance R9, optocoupler PC1 with
And resistance R10；Wherein, one end of the sampling resistor 1 and one end of sampling resistor R2, battery cathode end BAT-, source of stable pressure D1
Anode, one end of resistance R6, triode Q1 emitter connection, the other end of sampling resistor R1 is another with sampling resistor R2's
The reference pole connection at end, one end of sampling resistor R3, one end of resistance R7, source of stable pressure D1, the other end and electricity of sampling resistor R3
The collector of one end connection of pond positive terminal BAT+, one end of resistance R8, resistance R4, the other end of resistance R7 and triode Q1,
The other end of the cathode connection of one end of resistance R9, optocoupler PC1, the other end of resistance R8 and resistance R9, resistance R10 one end,
The anode connection of optocoupler PC1, the other end of resistance R4 are connect with one end of the cathode of source of stable pressure D1, resistance R5, and resistance R5's is another
One end is connect with the base stage of the other end of resistance R6, triode Q1, and the other end of resistance R10 is connect with the collector of optocoupler PC1.
2. the under-voltage warning circuit according to claim 1 with hysteresis, which is characterized in that the source of stable pressure D1 is used
Controllable accurate source of stable pressure TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821859404.6U CN209215474U (en) | 2018-11-12 | 2018-11-12 | A kind of under-voltage warning circuit with hysteresis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821859404.6U CN209215474U (en) | 2018-11-12 | 2018-11-12 | A kind of under-voltage warning circuit with hysteresis |
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| Publication Number | Publication Date |
|---|---|
| CN209215474U true CN209215474U (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821859404.6U Active CN209215474U (en) | 2018-11-12 | 2018-11-12 | A kind of under-voltage warning circuit with hysteresis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542818A (en) * | 2019-09-23 | 2021-03-23 | 中车株洲电力机车研究所有限公司 | Input undervoltage protection circuit and power panel comprising same |
-
2018
- 2018-11-12 CN CN201821859404.6U patent/CN209215474U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542818A (en) * | 2019-09-23 | 2021-03-23 | 中车株洲电力机车研究所有限公司 | Input undervoltage protection circuit and power panel comprising same |
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