CN205791487U - A kind of power protecting circuit - Google Patents
A kind of power protecting circuit Download PDFInfo
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- CN205791487U CN205791487U CN201620521896.2U CN201620521896U CN205791487U CN 205791487 U CN205791487 U CN 205791487U CN 201620521896 U CN201620521896 U CN 201620521896U CN 205791487 U CN205791487 U CN 205791487U
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- resistance
- audion
- protecting circuit
- power protecting
- ground
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Abstract
This utility model discloses a kind of power protecting circuit, this power protecting circuit at least includes a diode D1, one first audion Q1, one second audion Q2 and one 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 and the first resistance R1 are connected also and then are connected to the ground, described power protecting circuit also includes the second resistance R2 and the 3rd resistance R3 being in series, the free end of described second resistance R2 is connected with the junction point of diode D1 and the first resistance R1, the free end of described 3rd resistance R3 is connected to the ground, the base stage of described first audion Q1 is connected with the junction point of described second resistance R2 and the 3rd resistance R3, the emitter stage of described first audion Q1 is connected to the ground.The utility model proposes a kind of power protecting circuit, this circuit structure is simple, low cost, and volume is little, and protection comprehensively, is especially suitable for popularization and application in the industry.
Description
Technical field
This utility model relates to the resist technology field of battery, is 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 this utility model is contemplated to solve the above-mentioned problems in the prior art, it is proposed that a kind of power supply is protected
Protection circuit, this circuit can realize overvoltage and under-voltage protection.
The purpose of this utility model is achieved through the following technical solutions: a kind of power protecting circuit, have input and
Outfan, described power protecting circuit at least includes a diode D1, one first audion Q1, one second audion Q2 and
3rd audion Q3, the negative pole of described diode D1 is connected with the input of described power protecting circuit, described diode D1's
Positive pole and the first resistance R1 be connected and and then be connected to the ground, described power protecting circuit also include the second resistance R2 of being in series and
3rd resistance R3, the free end of described second resistance R2 is connected with the junction point of diode D1 and the first resistance R1, and the described 3rd
The free end of resistance R3 is connected to the ground, the base stage of described first audion Q1 and described second resistance R2 and the company of the 3rd resistance R3
Contact is connected, and the emitter stage of described first audion Q1 is connected to the ground, and described power protecting circuit also includes the 4th be in series
Resistance R4, the 5th resistance R5 and the 6th resistance R6, the free end of described 4th resistance R4 and the input of described power protecting circuit
End is connected, and 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
The junction point of R4 and the 5th resistance R5 is connected, the base stage of described second audion Q2 and described 5th resistance R5 and the 6th resistance R6
Junction point be connected, the emitter stage of described second audion Q2 is connected to the ground, and the colelctor electrode of described second audion Q2 is with described
The grid of the 3rd audion Q3 is connected, and the described source electrode of the 3rd audion Q3 is connected with the input of described power protecting circuit,
The drain electrode of described 3rd audion Q3 is connected with the outfan of described power protecting circuit, the grid of described 3rd audion Q3 with
It is also associated with the 7th resistance R7 between the source electrode of described 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 solutions of the utility model is mainly reflected in: after utilizing the overvoltage of Zener diode, pain is broken and metal-oxide-semiconductor
Break-make realize overvoltage and the under-voltage protection of voltage；Add this power protecting circuit can ensure that load will not 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
Application.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of power protecting circuit embodiment one of the present utility model；
Fig. 2 is the circuit diagram of a kind of power protecting circuit embodiment two of the present utility model.
Detailed description of the invention
The purpose of this utility model, advantage and feature, will carry out figure by the non-limitative illustration of preferred embodiment below
Show and explain.These embodiments only be application technical solutions of the utility model prominent example, all take equivalent or etc.
Effect conversion and the technical scheme that formed, all fall within this utility model claimed within the scope of.
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, after adding circuit of the present utility model, and under-voltage feelings
Condition will be cut off, and can ensure that load will not be because of overvoltage and under-voltage and damage after adding this circuit.
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 utility model proposes a kind of power protecting circuit, this power protecting circuit simple in construction, low cost, volume
Little, protection comprehensively, is especially suitable for promoting the use of in the industry.
It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit and essential characteristics of the present utility model, it is possible to realize this practicality in other specific forms new
Type.Therefore, no matter from the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, this practicality is new
The scope of type is limited by claims rather than described above, it is intended that by the containing of equivalency in claim that fall
All changes in justice and scope are included in this utility model, should not be considered as any reference in claim limiting
Involved 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 |
|---|---|---|---|
| CN201620521896.2U CN205791487U (en) | 2016-06-01 | 2016-06-01 | A kind of power protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620521896.2U CN205791487U (en) | 2016-06-01 | 2016-06-01 | A kind of power protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205791487U true CN205791487U (en) | 2016-12-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620521896.2U Expired - Fee Related CN205791487U (en) | 2016-06-01 | 2016-06-01 | A kind of power protecting circuit |
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| Country | Link |
|---|---|
| CN (1) | CN205791487U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846402A (en) * | 2016-06-01 | 2016-08-10 | 江苏安纳金机械有限公司 | Power source protection circuit |
-
2016
- 2016-06-01 CN CN201620521896.2U patent/CN205791487U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846402A (en) * | 2016-06-01 | 2016-08-10 | 江苏安纳金机械有限公司 | Power source protection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 Termination date: 20210601 |