CN105846402A - Power source protection circuit - Google Patents
Power source protection circuit Download PDFInfo
- Publication number
- CN105846402A CN105846402A CN201610380841.9A CN201610380841A CN105846402A CN 105846402 A CN105846402 A CN 105846402A CN 201610380841 A CN201610380841 A CN 201610380841A CN 105846402 A CN105846402 A CN 105846402A
- Authority
- CN
- China
- Prior art keywords
- audion
- resistance
- protecting circuit
- power protecting
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
Abstract
The present invention reveals a power source protection circuit, the power source protection circuit at least includes a diode D1, a first transistor Q1, a second transistor Q2 and a third transistor Q3, the cathode of the diode D1 is connected to an input terminal of the power source protection circuit, the anode of the diode D1 is connected to a first resistor R1 and connected to the ground, the power source protection circuit further includes a second resistor R2 and a third resistor R3 connected in series, the free end of the second resistor R2 is connected to a connection point between the diode D1 and the first resistor R1, the free end of a third resistor R3 is connected to the ground, the base of the first transistor Q1 is connected to a connection point between the second resistor R2 and the third resistor R3, the emitter of the first transistor Q1 is connected to the ground. The present invention provides the power source protection circuit, and the circuit has a simple structure, a low cost, a small volume, and provides comprehensive protection, and is very suitable for popularization and application in the industry.
Description
Technical field
The present invention relates to the resist technology field of battery, be specifically related to a kind of power protecting circuit.
Background technology
Along with scientific and technological progress and social development, as mobile phone, notebook computer, MP3 player, PDA, DV etc. just
The portable device the most next moon is popularized, and having many in this series products is to use lithium battery power supply.
Due to the chemical characteristic of lithium ion battery, during normal use, carry out electric energy inside it mutual with chemical energy
The chemical positive reaction converted, but under certain conditions, as inside battery caused to send out its overcharge, overdischarge and overcurrent
Biochemical side reaction, after this side reaction aggravation, can have a strong impact on performance and the service life of battery, and may produce a large amount of gas
Body, makes cell internal pressure increase after-explosion rapidly and causes safety problem.For current many equipment to voltage request
Strictly, voltage range there are strict requirements, do not allow to occur overvoltage and under-voltage, although current supply voltage ratio is calibrated, but
It is to there is not this protection, it is impossible to ensure definite voltage range.Therefore lithium ion battery is required for a protection circuit, is used for
The charge and discharge state of battery is effectively monitored, and turns off charge and discharge loop under certain conditions to prevent from battery is occurred
Infringement, it is ensured that load will not be because of overvoltage and under-voltage and damage.
Summary of the invention
The purpose of the present invention is contemplated to solve the above-mentioned problems in the prior art, it is proposed that a kind of
Power protecting circuit, this circuit can realize overvoltage and under-voltage protection.
The purpose of the present invention is achieved through the following technical solutions: a kind of power protecting circuit, has input and output
End, described power protecting circuit at least includes a diode D1, one first audion Q1, one second audion Q2 and the 3rd
Audion Q3, the negative pole of described diode D1 is connected with the input of described power protecting circuit, the positive pole of described diode D1
Be connected with the first resistance R1 and and then be connected to the ground, described power protecting circuit also includes the second resistance R2 and the 3rd being in series
Resistance R3, the free end of described second resistance R2 is connected with the junction point of diode D1 and the first resistance R1, described 3rd resistance
The free end of R3 is connected to the ground, the base stage of described first audion Q1 and described second resistance R2 and the junction point of the 3rd resistance R3
Being connected, the emitter stage of described first audion Q1 is connected to the ground, and described power protecting circuit also includes the 4th resistance being in series
R4, the 5th resistance R5 and the 6th resistance R6, the free end of described 4th resistance R4 and the input phase of described power protecting circuit
Even, the free end of described 6th resistance R6 is connected to the ground, the colelctor electrode of described first audion Q1 and described 4th resistance R4 and
The junction point of the 5th resistance R5 is connected, the base stage of described second audion Q2 and described 5th resistance R5 and the company of the 6th resistance R6
Contact is connected, and the emitter stage of described second audion Q2 is connected to the ground, the colelctor electrode and the described 3rd of described second audion Q2
The grid of audion Q3 is connected, and the described source electrode of the 3rd audion Q3 is connected with the input of described power protecting circuit, described
The drain electrode of the 3rd audion Q3 is connected with the outfan of described power protecting circuit, and the grid of described 3rd audion Q3 is with described
It is also associated with the 7th resistance R7 between the source electrode of the 3rd audion Q3.
Preferably, described power protecting circuit also includes one the 4th audion Q4, the colelctor electrode of described 4th audion Q4
Being connected with the colelctor electrode of described first audion Q1, described power protecting circuit also includes the 8th resistance R8 and the 9th being in series
Resistance R9, the described base stage of the 4th audion Q4 is connected with the junction point of the 8th resistance R8 and the 9th resistance R9, and the described 4th 3
The emitter stage of pole pipe Q4 is connected to the ground, and the described free end of the 8th resistance R8 is connected with the input of described power protecting circuit,
The free end of described 9th resistance R9 is connected to the ground.
Preferably, between the outfan and described 3rd audion Q3 of described power protecting circuit, it is also associated with one
Ten resistance R10, described one end of tenth resistance R10 is connected with the outfan of described power protecting circuit, described tenth resistance R10
The other end be connected with the drain electrode of described 3rd audion.
Preferably, described diode D1 is Zener diode.
Preferably, the model of described diode D1 is MMSZ5245B.
Preferably, the model of described first audion Q1 and described second audion Q2 is MMBT3904.
Preferably, the model of described 3rd audion Q3 is FDS4435BZ.
Preferably, the pin 1 and/or 2 and/or 3 of described FDS4435BZ is connected with the source electrode of described 3rd audion Q3,
The pin 4 of described FDS4435BZ is connected with the grid of described 3rd audion Q3, the pin 5 and/or 6 of described FDS4435BZ
And/or 7 and/or 8 be connected with the drain electrode of described 3rd audion Q3.
Preferably, the model of described 4th audion Q4 is MMBT3904.
The advantage of technical solution of the present invention is mainly reflected in: utilize pain after the overvoltage of Zener diode disconnected and metal-oxide-semiconductor logical
Break to realize the overvoltage of voltage and under-voltage protection；Add this power protecting circuit and can ensure that load will not be because of overvoltage and under-voltage
And damage, this power protecting circuit simple in construction, low cost, volume is little, and protection comprehensively, is especially suitable for promoting in the industry and answers
With.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of power protecting circuit embodiment one of the present invention；
Fig. 2 is the circuit diagram of a kind of power protecting circuit embodiment two of the present invention.
Detailed description of the invention
The purpose of the present invention, advantage and feature, by by the non-limitative illustration of preferred embodiment below carry out diagram and
Explain.These embodiments are only the prominent examples of application technical solution of the present invention, all take equivalent or equivalent transformation and
The technical scheme formed, within all falling within the scope of protection of present invention.
Embodiment 1: as it is shown in figure 1, a kind of power protecting circuit, there is input and outfan, described power protection electricity
Road at least includes a diode D1, one first audion Q1, one second audion Q2 and one the 3rd audion Q3, described two poles
The negative pole of pipe D1 is connected with the input of described power protecting circuit, and the positive pole of described diode D1 and the first resistance R1 are connected also
And then be connected to the ground；In the present embodiment, described diode D1 is Zener diode；The model of described diode D1 is
MMSZ5245B。
Described power protecting circuit also includes the second resistance R2 and the 3rd resistance R3 being in series, described second resistance R2's
Free end is connected with the junction point of diode D1 and the first resistance R1, and the free end of described 3rd resistance R3 is connected to the ground, described
The base stage of the first audion Q1 is connected with the junction point of described second resistance R2 and the 3rd resistance R3, described first audion Q1's
Emitter stage is connected to the ground, and described power protecting circuit also includes the 4th resistance R4, the 5th resistance R5 and the 6th resistance being in series
R6, the described free end of the 4th resistance R4 is connected with the input of described power protecting circuit, the freedom of described 6th resistance R6
End is connected to the ground, and the colelctor electrode of described first audion Q1 is connected with the junction point of described 4th resistance R4 and the 5th resistance R5,
The base stage of described second audion Q2 is connected with the junction point of described 5th resistance R5 and the 6th resistance R6, described second audion
The emitter stage of Q2 is connected to the ground, and the colelctor electrode of described second audion Q2 is connected with the grid of described 3rd audion Q3, described
The source electrode of the 3rd audion Q3 is connected with the input of described power protecting circuit, and the drain electrode of described 3rd audion Q3 is with described
The outfan of power protecting circuit is connected, between grid and the source electrode of described 3rd audion Q3 of described 3rd audion Q3 also
Connect and have the 7th resistance R7；In the present embodiment, the model of described first audion Q1 and described second audion Q2 is
MMBT3904；The model of described 3rd audion Q3 is FDS4435BZ.
Embodiment 2: and unlike embodiment 1, embodiment 2 also includes, as in figure 2 it is shown, described power protecting circuit is also
Including one the 4th audion Q4, the colelctor electrode of described 4th audion Q4 is connected with the colelctor electrode of described first audion Q1, institute
State the 8th resistance R8 and the 9th resistance R9 that power protecting circuit also includes being in series, the base stage of described 4th audion Q4 and the
The junction point of eight resistance R8 and the 9th resistance R9 is connected, and the emitter stage of described 4th audion Q4 is connected to the ground.At the present embodiment
In, the model of described 4th audion Q4 is MMBT3904.The free end of described 8th resistance R8 and described power protecting circuit
Input be connected, the free end of described 9th resistance R9 is connected to the ground..In series circuit, each ohmically electric current is equal,
The voltage sum at each resistance two ends is equal to circuit total voltage, it is known that each ohmically voltage is less than circuit total voltage, therefore described
8th resistance R8, described 9th resistance R9 dividing potential drop.
As in figure 2 it is shown, be also associated with between the outfan and described 3rd audion Q3 of described power protecting circuit
The a tenth resistance R10, described one end of tenth resistance R10 is connected with the outfan of described power protecting circuit, described tenth electricity
The other end of resistance R10 is connected with the drain electrode of described 3rd audion.Described tenth resistance R10 plays current limliting in this circuit and divides
The effect of pressure, described tenth resistance R10 is series in circuit, in order to limit the size of place branch current, in case electric current is excessive
Burn out connected components and parts；The most described tenth resistance R10 also can play dividing potential drop effect.
In this application, described 3rd audion Q3 has two kinds of implementations, and one is the three or three pole described in embodiment 1
The drain electrode of pipe is connected with outfan；Another kind is that described in embodiment 2, the model of the 3rd audion Q3 is FDS4435BZ.Described
The pin 1 and/or 2 and/or 3 of FDS4435BZ is connected with the source electrode of described 3rd audion Q3, the pin 4 of described FDS4435BZ
It is connected with the grid of described 3rd audion Q3, the pin 5 and/or 6 and/or 7 and/or 8 and the described 3rd of described FDS4435BZ
The drain electrode of audion Q3 is connected.
For all of electric equipment, there is a rated voltage, but in practice, it is impossible to it is completely secured at specified electricity
Pressure work, is a scope near rated voltage, typically requires ± 15%.In order to protect electric equipment and technique matter
Amount, if less than-15% this voltage, arising that undervoltage condition, when running voltage drops to below this voltage, and protection is dynamic
Make, cut off the electricity supply.On the contrary, if above+15% this voltage, arise that overpressure situation, protection act, cut off the electricity supply.
Power supply easily occurs under-voltage input voltage deficiency when, and after adding the circuit of the present invention, under-voltage situation is just
Can be cut off, after adding this circuit, can ensure that load will not be because of overvoltage and under-voltage and damage.
During electric voltage over press, diode D1 turns on, and makes the 3rd audion Q3 cut by the first audion Q1, the second audion Q2
Stop, thus realize overvoltage protection.During electric voltage over press, diode D1 turns on, and then the B terminal voltage of Q1 uprises, and causes Q1 to turn on, Q1
After conducting, the B pole of Q2 will be dragged down, the B pole of Q2 drags down rear Q2 and is not turned on.Q2 causes the G pole of Q3 to become if being not turned on
Height, Q3 is not turned on.
During under-voltage, resistance R4, resistance R5, resistance R6 dividing potential drop, open voltage less than the second audion Q2, make second
Audion Q2 ends, so that the 3rd audion Q3 cut-off, it is achieved under-voltage protection.Utilize this characteristic of lithium battery self-protection,
This circuit can bear instantaneous large-current variation or fluctuation, and then play and protect product, prevents product in under-voltage and mistake
Come to harm during pressure.
When VCC_15V is high pressure, the voltage of the second resistance R2 free end (i.e. 2 end) is that VCC_15V deducts D1(voltage stabilizing two
Pole is managed) backward voltage, i.e. VR2_2=VCC_15V-VD1(1).The voltage of the second resistance R2 resistance 1 end is the second resistance R22 end
Voltage is through the second resistance R2 and the voltage of the 3rd resistance R3 dividing potential drop, i.e. VR2_1=VR2_2*R3/ (R2+R3) (2).By (1) formula
It is updated in (2) formula then VR2_1=(VCC_15V-VD1) * R3/ (R2+R3).When the voltage of VCC_15V is higher than certain voltage
Time, VR2_1 will be higher than the conducting voltage of the first audion Q1, and the conducting voltage of the first audion Q1 is 0.7V, the one or three pole
Pipe Q1 turns on, and by the voltage pull-down of the 5th R5 resistance 2 end to 0V after the first audion Q1 conducting, the 5th resistance R51 terminal voltage is also
Becoming 0V, because 0V voltage is through electric resistance partial pressure or 0V, described second audion Q2 audion B pole tension is low, the two or three pole
Pipe Q2 cut-off (internal resistance is infinitely great).3rd audion Q3 audion G pole tension is that VCC_15V obtains after R7 and Q2 internal resistance dividing potential drop
Voltage, the second audion Q2 internal resistance is infinitely great, so the 3rd audion Q3 G is the highest, the 3rd audion Q3(PMOS) cut
Stop, thus realize high voltage protective.
Low-voltage variation: VCC_15V voltage is not reaching to high voltage protective, can locate according to the first audion Q1 as previously mentioned always
In cut-off state (internal resistance is infinitely great, is equivalent to open circuit, is equivalently employed without this partial circuit).VCC_15V through the 4th resistance R4,
5th resistance R5, the 6th resistance R6 dividing potential drop, the voltage of the second audion Q2 B pole is VCC_15V*R6/(R4+R5+R6), when this
When individual voltage is less than the conducting voltage of the second audion Q2, the second audion Q2 cut-off.3rd audion Q3 described above
(PMOS) cut-off, thus realize low-voltage variation.
The present invention proposes a kind of power protecting circuit, this power protecting circuit simple in construction, low cost, and volume is little, protects
Protect comprehensively, be especially suitable for promoting the use of in the industry.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of the spirit and essential characteristics of the present invention, it is possible to realize the present invention in other specific forms.Therefore, no matter
From the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all by fall in the implication of equivalency and scope of claim
Change is included in the present invention, should not be considered as limiting involved claim by any reference in claim.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only wraps
Containing an independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should
Description can also be formed those skilled in the art through appropriately combined as an entirety, the technical scheme in each embodiment
May be appreciated other embodiments.
Claims (9)
1. a power protecting circuit, has input and outfan, it is characterised in that: described power protecting circuit at least includes
One diode D1, one first audion Q1, one second audion Q2 and one the 3rd audion Q3, the negative pole of described diode D1
Be connected with the input of described power protecting circuit, the positive pole of described diode D1 and the first resistance R1 be connected and and then with ground phase
Even, described power protecting circuit also includes the second resistance R2 and the 3rd resistance R3 being in series, the freedom of described second resistance R2
End is connected with the junction point of diode D1 and the first resistance R1, and the free end of described 3rd resistance R3 is connected to the ground, and described first
The base stage of audion Q1 is connected with the junction point of described second resistance R2 and the 3rd resistance R3, the transmitting of described first audion Q1
Pole is connected to the ground, and described power protecting circuit also includes the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 being in series, institute
The input of the free end and described power protecting circuit of stating the 4th resistance R4 is connected, the free end of described 6th resistance R6 and ground
Being connected, the colelctor electrode of described first audion Q1 is connected with the junction point of described 4th resistance R4 and the 5th resistance R5, and described the
The base stage of two audion Q2 is connected with the junction point of described 5th resistance R5 and the 6th resistance R6, and described second audion Q2 sends out
Emitter-base bandgap grading is connected to the ground, and the colelctor electrode of described second audion Q2 is connected with the grid of described 3rd audion Q3, and the described 3rd 3
The source electrode of pole pipe Q3 is connected with the input of described power protecting circuit, and the drain electrode of described 3rd audion Q3 is protected with described power supply
The outfan of protection circuit is connected, and is also associated with between grid and the source electrode of described 3rd audion Q3 of described 3rd audion Q3
7th resistance R7.
A kind of power protecting circuit the most according to claim 1, it is characterised in that: described power protecting circuit also includes one
4th audion Q4, the colelctor electrode of described 4th audion Q4 is connected with the colelctor electrode of described first audion Q1, described power supply
Protection circuit also includes the 8th resistance R8 and the 9th resistance R9 being in series, the base stage of described 4th audion Q4 and the 8th resistance
The junction point of R8 and the 9th resistance R9 is connected, and the emitter stage of described 4th audion Q4 is connected to the ground, described 8th resistance R8's
Free end is connected with the input of described power protecting circuit, and the free end of described 9th resistance R9 is connected to the ground.
A kind of power protecting circuit the most according to claim 1, it is characterised in that: in the output of described power protecting circuit
The a tenth resistance R10, one end of described tenth resistance R10 and described electricity it is also associated with between end and described 3rd audion Q3
The outfan of protection circuit is connected, and the other end of described tenth resistance R10 is connected with the drain electrode of described 3rd audion.
A kind of power protecting circuit the most according to claim 1, it is characterised in that: described diode D1 is voltage stabilizing two pole
Pipe.
A kind of power protecting circuit the most according to claim 1, it is characterised in that: the model of described diode D1 is
MMSZ5245B。
A kind of power protecting circuit the most according to claim 1, it is characterised in that: described first audion Q1 and described the
The model of two audion Q2 is MMBT3904.
A kind of power protecting circuit the most according to claim 2, it is characterised in that: the model of described 3rd audion Q3 is
FDS4435BZ。
A kind of power protecting circuit the most according to claim 7, it is characterised in that: the pin 1 of described FDS4435BZ and/
Or 2 and/or 3 be connected with the source electrode of described 3rd audion Q3, pin 4 and the described 3rd audion Q3 of described FDS4435BZ
Grid be connected, the pin 5 and/or 6 and/or 7 and/or 8 of described FDS4435BZ and the drain electrode phase of described 3rd audion Q3
Even.
A kind of power protecting circuit the most according to claim 2, it is characterised in that: the model of described 4th audion Q4 is
MMBT3904。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610380841.9A CN105846402A (en) | 2016-06-01 | 2016-06-01 | Power source protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610380841.9A CN105846402A (en) | 2016-06-01 | 2016-06-01 | Power source protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105846402A true CN105846402A (en) | 2016-08-10 |
Family
ID=56596212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610380841.9A Pending CN105846402A (en) | 2016-06-01 | 2016-06-01 | Power source protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105846402A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147076A (en) * | 2017-06-30 | 2017-09-08 | 湖州灵感电子科技有限公司 | A kind of LED under-voltage protecting circuit |
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| CN201349121Y (en) * | 2008-12-29 | 2009-11-18 | 深圳市同洲电子股份有限公司 | Direct current input overvoltage and under-voltage protection circuit |
| US20140063858A1 (en) * | 2011-03-11 | 2014-03-06 | Juergen Mack | Supply voltage control |
| CN104242233A (en) * | 2014-09-26 | 2014-12-24 | 深圳市伊爱高新技术开发有限公司 | Overvoltage-undervoltage protecting circuit automatically supporting different power systems |
| CN205791487U (en) * | 2016-06-01 | 2016-12-07 | 江苏安纳金机械有限公司 | A kind of power protecting circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201113384Y (en) * | 2007-09-12 | 2008-09-10 | 青岛海信移动通信技术股份有限公司 | Electricized overvoltage protection circuit and mobile terminal possessing the circuit |
| CN201349121Y (en) * | 2008-12-29 | 2009-11-18 | 深圳市同洲电子股份有限公司 | Direct current input overvoltage and under-voltage protection circuit |
| US20140063858A1 (en) * | 2011-03-11 | 2014-03-06 | Juergen Mack | Supply voltage control |
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| CN107147076A (en) * | 2017-06-30 | 2017-09-08 | 湖州灵感电子科技有限公司 | A kind of LED under-voltage protecting circuit |
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Application publication date: 20160810 |