CN206293889U - A kind of load short-circuit protection circuit - Google Patents
A kind of load short-circuit protection circuit Download PDFInfo
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- CN206293889U CN206293889U CN201621472313.8U CN201621472313U CN206293889U CN 206293889 U CN206293889 U CN 206293889U CN 201621472313 U CN201621472313 U CN 201621472313U CN 206293889 U CN206293889 U CN 206293889U
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Abstract
The utility model embodiment discloses a kind of load short-circuit protection circuit, including control chip, MCU, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, triode Q4, triode Q5, triode Q6 and power supply, the source electrode of metal-oxide-semiconductor Q1 is connected with the positive pole of power supply, the grid of metal-oxide-semiconductor Q1 is connected with the charge control end of control chip, the drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q2 and the source electrode of metal-oxide-semiconductor Q3 are connected with the discharge control terminal of control chip, the drain electrode of the source electrode and metal-oxide-semiconductor Q3 of metal-oxide-semiconductor Q2 is connected with electric discharge positive pole, the grid of metal-oxide-semiconductor Q3 is connected with the colelctor electrode of triode Q4.The utility model embodiment is not only simple in structure, safe and reliable, and enables to the communication function of battery bag more stable.
Description
Technical field
The utility model is related to circuit field, more particularly to a kind of load short-circuit protection circuit.
Background technology
At present, during control chip has been widely used for the industries such as electric tool, unmanned plane, but it is powered in control chip
Moment, can draw high control circuit in charge switch control end and discharge switch control end voltage so that filling
Electric switch, discharge switch conducting.It is certain after control chip energization again because control chip inside has a pump pressure circuit
In time range（Such as 3ms or so）, the pump pressure circuit can produce pump pressure phenomenon, and this will result in uncontrollable charge switch, puts
The disconnection of electric switch, only after pump pressure phenomenon terminates, can control the conducting and disconnection of charge switch, discharge switch.Such as
Before control chip energization, the load that the discharge end of whole circuit is connect is in short-circuit condition to fruit, then control chip is powered
Moment will cause whole circuit burnout.For this problem, the solution for being used at present cannot be solved fundamentally
All the time there is potential safety hazard in problem, whole circuit.
The content of the invention
The utility model embodiment provides a kind of load short-circuit protection circuit, and its simple structure can be prevented effectively from because negative
The circuit for carrying short circuit and causing is damaged, and then protects whole circuit, and stable performance, safe and reliable.
The utility model embodiment provide a kind of load short-circuit protection circuit, including control chip, MCU, metal-oxide-semiconductor Q1,
Metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, triode Q4, triode Q5, triode Q6 and power supply, source electrode and the power supply electricity of metal-oxide-semiconductor Q1
The positive pole in source is connected, and the grid of metal-oxide-semiconductor Q1 is connected with the charge control end of control chip, and the drain electrode of metal-oxide-semiconductor Q1 is with metal-oxide-semiconductor Q2's
Drain electrode is connected, and the grid of metal-oxide-semiconductor Q2 and the source electrode of metal-oxide-semiconductor Q3 are connected with the discharge control terminal of control chip, metal-oxide-semiconductor Q2's
The drain electrode of source electrode and metal-oxide-semiconductor Q3 is connected with electric discharge positive pole, and the grid of metal-oxide-semiconductor Q3 is connected with the colelctor electrode of triode Q4, and three
The base stage of pole pipe Q4 is connected with the control signal output of MCU, the grounded emitter of triode Q4, the emitter stage of triode Q5 with
The positive pole of power supply is connected, and the colelctor electrode of triode Q5 is connected with the trigger signal input of control chip, triode Q5's
Base stage is connected with the emitter stage of triode Q6, and the base stage of triode Q6 is connected with the trigger signal output end of MCU, triode Q6's
Grounded collector, the negative pole of power supply, the earth terminal of control chip, the earth terminal of MCU and electric discharge negative pole are grounded, and control
Chip is also connected by I2C buses with MCU.
Preferably, the load short-circuit protection circuit also includes diode D1, resistance R1, resistance R2 and resistance R3, two
The negative pole of pole pipe D1 and one end of resistance R1 are connected with the positive pole of power supply, the positive pole of diode D1, resistance R1 it is another
One end of end and resistance R2 are connected by resistance R3 with the charge control end of control chip, the other end and MOS of resistance R2
The grid of pipe Q1 is connected.
Preferably, the load short-circuit protection circuit also includes diode D2, resistance R4, resistance R5 and resistance R6, two
The negative pole of pole pipe D2, one end of resistance R6 are connected with electric discharge positive pole, the positive pole of diode D2, the other end and electricity of resistance R6
The one end for hindering R4 is connected by resistance R5 with the discharge control terminal of control chip.
Preferably, the load short-circuit protection circuit also includes resistance R7, resistance R8, resistance R9 and resistance R10, MOS
The grid of pipe Q3 is connected with one end of resistance R7, and the source electrode of metal-oxide-semiconductor Q3 and the other end of resistance R7 pass through resistance R8 and three poles
The colelctor electrode of pipe Q4 is connected, and the base stage of triode Q4 is connected by resistance R9 with the control signal output of MCU, triode Q4's
Base stage is also grounded by resistance R10.
Preferably, the load short-circuit protection circuit also includes resistance R11, resistance R12, resistance R13, resistance R14, resistance
The colelctor electrode of R15 and resistance R16, triode Q5 is connected by resistance R14 with the trigger signal input of control chip, three poles
The emitter stage of pipe Q5 is connected by resistance R11 with the positive pole of power supply, and the emitter stage of triode Q5 also passes through resistance R12 and three
The base stage of pole pipe Q5 is connected, and the base stage of triode Q5 is also connected by resistance R13 with the emitter stage of triode Q6, triode Q6's
Base stage is connected by resistance R15 with the trigger signal output end of MCU, and the base stage of triode Q6 is also grounded by resistance R16, three poles
The grounded collector of pipe Q6.
Preferably, the model RAJ240045 of control chip.
Preferably, the power supply includes the battery of several series connection and/or parallel connection.
Its simple structure of the utility model embodiment, can be prevented effectively from because load short circuits and caused by circuit damage,
And then whole circuit, and stable performance are protected, it is safe and reliable.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment technical scheme, below will be to make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the present utility model, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of schematic diagram of load short-circuit protection circuit that the utility model embodiment is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is a part of embodiment of the utility model, rather than whole implementation
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment for obtaining, belongs to the scope of the utility model protection.
Embodiment one
Such as Fig. 1, a kind of load short-circuit protection circuit of the utility model embodiment offer, including control chip U1, MCU, MOS
Pipe Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, triode Q4, triode Q5, triode Q6 and power supply B, the source S of metal-oxide-semiconductor Q1 with
The positive pole B1 of power supply B is connected, and the grid G of metal-oxide-semiconductor Q1 is connected with the charge control end 1 of control chip U1, the leakage of metal-oxide-semiconductor Q1
Pole D is connected with the drain D of metal-oxide-semiconductor Q2, the grid G of metal-oxide-semiconductor Q2 and the source S of metal-oxide-semiconductor Q3 with the electric discharge of control chip U1
Control end 2 is connected, and the source S of metal-oxide-semiconductor Q2 and the drain D of metal-oxide-semiconductor Q3 are connected with electric discharge positive pole P1, the grid G of metal-oxide-semiconductor Q3
It is connected with the colelctor electrode C of triode Q4, the control signal output 1 of the base stage B and MCU of triode Q4 is connected, triode Q4's
Emitter E is grounded, and the emitter E of triode Q5 is connected with the positive pole of power supply B, colelctor electrode C and the control core of triode Q5
The trigger signal input 3 of piece U1 is connected, and the base stage B of triode Q5 is connected with the emitter E of triode Q6, the base of triode Q6
Pole B is connected with the trigger signal output end 2 of MCU, the colelctor electrode C ground connection of triode Q6, the negative pole B2 of power supply B, control core
The earth terminal 3 and electric discharge negative pole P2 of the earth terminal 4, MCU of piece U1 are grounded, and control chip U1 also passes through I2C buses and MCU phases
Even.
Wherein, as having choosing, the model RAJ240045 of control chip U1, it is, of course, also possible to be that others can be entered
Row charges, the chip of control of discharge.Used as another preferred, the power supply can be connected in series by several batteries and be constituted
Or several cell parallels connection composition, again be connected in parallel after can also first being connected by several batteries constituting.Institute
State battery of the power supply including several series connection and/or parallel connection, battery here can be can discharge and recharge battery, certainly
Can also be the battery of other species, highly preferred, the quantity of battery here can be 4.In addition, the load is short
Road protection circuit is connected with external loading by the positive pole P1 and electric discharge negative pole P2 that discharges.Furthermore, I2C buses include serial data line
And serial time line, therefore control chip U1 receives the control signal of MCU by serial data line and serial time line, with
Control the conducting of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 and disconnect.
Specific operation principle is as follows：Before control chip U1 in load short-circuit protection circuit is powered, by the control of MCU
Signal output part processed 1 exports high level signal so that metal-oxide-semiconductor Q3 and triode Q4 is turned on（That is triode Q4 is first turned on, then
Metal-oxide-semiconductor Q3 is turned on）, now the grid G and source S of metal-oxide-semiconductor Q2 be then forced to be pulled on same high level so that metal-oxide-semiconductor
Q2 is remained off between the output high period of control signal output 1 of MCU, whole with loaded protection electricity to ensure
The discharge loop on road disconnects.
The need for according to user, after certain Preset Time（Such as 2ms）, the trigger signal output end 2 of MCU exports height
Level signal, now triode Q5 and triode Q6 are both turned on（That is triode Q6 is first turned on, and then triode Q5 is just turned on）,
Now the trigger signal input 3 of control chip U1 receives high level signal, so as to trigger whole control chip U1 be powered.Cause
For control chip U1 inside has a pump pressure loop, there is a pump pressure when control chip U1 is initially powered and complete rank
Section, generally, the pump pressure completion stage needs time of 3ms or so, so when need to ensure control within the time more than 3ms
The trigger signal input 3 of coremaking piece U1 receives high level signal to complete pump pressure process, and used as preferred, this time can
Being 5ms.Then, then the trigger signal output end of MCU is controlled to export low level signal, after maintaining another Preset Time（Than
Such as 3ms）, drag down the high level signal of the control signal output 1 of MCU, i.e. the output low level of control signal output 1 of MCU
Signal, now metal-oxide-semiconductor Q3 and triode Q4 disconnections, then MCU can just be communicated by I2C buses with control chip U1,
Respectively correspondingly to control the conducting and disconnection of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 by charge control end and discharge control terminal.
That is in the complete process that the inside of control chip U1 is pumped, if load short circuits or discharge loop are deposited
In the situation of short circuit, then because the control signal output 1 of MCU exports high level signal, can cause that metal-oxide-semiconductor Q2 is in and disconnect
State, it is impossible to form discharge loop, whole circuit is safe, so as to realize the protection to circuit, improve security performance and
Reliability.Furthermore, after pump pressure is completed, even if the output low level signal of control signal output 1 of MCU, metal-oxide-semiconductor Q2 can locate
In conducting state, even if there is the situation of short circuit, that is, when there is the situation of load short circuits, the short circuit of control chip U1 in discharge loop
Detection can be triggered, and metal-oxide-semiconductor Q1 and/or metal-oxide-semiconductor Q2 can be just closed in 500us, and it is right further to realize
The protection of the discharge loop of protection circuit.Wherein the situation of load short circuits when, metal-oxide-semiconductor Q1 and/or metal-oxide-semiconductor Q2 is except above institute
Outside the 500us for stating, some fluctuations are had according to different component combinations, varying environment condition.
Embodiment two
The present embodiment is that the load short-circuit protection circuit also includes diode D1, resistance with the difference of embodiment one
R1, resistance R2 and resistance R3, the negative pole of diode D1 and one end of resistance R1 are connected with the positive pole B1 of power supply B, and two
One end of the positive pole, the other end of resistance R1 and resistance R2 of pole pipe D1 is by the charge control of resistance R3 and control chip U1
End 1 is connected, and the other end of resistance R2 is connected with the grid G of metal-oxide-semiconductor Q1.Diode D1, resistance R1, resistance R2 and resistance R3's
Setting can further assure that the safety and stability of protection circuit.
Embodiment three
The present embodiment is that the load short-circuit protection circuit also includes two poles with the difference of embodiment one or embodiment two
Pipe D2, resistance R4, resistance R5 and resistance R6, the negative pole of diode D2, one end of resistance R6 are connected with electric discharge positive pole P1, and two
One end of the positive pole, the other end of resistance R6 and resistance R4 of pole pipe D2 is by the control of discharge of resistance R5 and control chip U1
End 2 is connected.The setting of diode D2, resistance R4, resistance R5 and resistance R6 can further assure that the safety of protection circuit
Property and stability.
Embodiment 4
The present embodiment is with the difference of embodiment one or embodiment two or embodiment three, the load short-circuit protection circuit
Also include resistance R7, resistance R8, resistance R9 and resistance R10, the grid G of metal-oxide-semiconductor Q3 is connected with one end of resistance R7, metal-oxide-semiconductor
The source S of Q3 and the other end of resistance R7 are connected by resistance R8 with the colelctor electrode C of triode Q4, the base stage B of triode Q4
It is connected with the control signal output 1 of MCU by resistance R9, the base stage B of triode Q4 is also grounded by resistance R10.Resistance R7,
The setting of resistance R8, resistance R9 and resistance R10 can further assure that the safety and stability of protection circuit.
Embodiment 5
The present embodiment is that the load is short with the difference of embodiment one or embodiment two or embodiment three or example IV
Road protection circuit also includes resistance R11, resistance R12, resistance R13, resistance R14, resistance R15 and resistance R16, triode Q5's
Colelctor electrode C is connected by resistance R14 with the trigger signal input 3 of control chip U, and the emitter E of triode Q5 passes through resistance
R11 is connected with the positive pole B1 of power supply B, and the emitter E of triode Q5 is also by the base stage B phases of resistance R12 and triode Q5
Even, the base stage B of triode Q5 is also connected by resistance R13 with the emitter E of triode Q6, and the base stage B of triode Q6 is by electricity
Resistance R15 is connected with the trigger signal output end 2 of MCU, and the base stage B of triode Q6 is also grounded by resistance R16, the collection of triode Q6
Electrode C is grounded.The setting of resistance R11, resistance R12, resistance R13, resistance R14, resistance R15 and resistance R16 can be further
Ground ensures the safety and stability of protection circuit.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in various in the technical scope that the utility model is disclosed
Equivalent modification or replacement, these modifications or replacement should all be covered within protection domain of the present utility model.Therefore, this practicality
New protection domain should be defined by scope of the claims.
Claims (7)
1. a kind of load short-circuit protection circuit, it is characterised in that including control chip, MCU, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor
Q3, triode Q4, triode Q5, triode Q6 and power supply, the source electrode of metal-oxide-semiconductor Q1 are connected with the positive pole of power supply,
The grid of metal-oxide-semiconductor Q1 is connected with the charge control end of control chip, and the drain electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, MOS
The grid of pipe Q2 and the source electrode of metal-oxide-semiconductor Q3 are connected with the discharge control terminal of control chip, the source electrode and MOS of metal-oxide-semiconductor Q2
The drain electrode of pipe Q3 is connected with electric discharge positive pole, and the grid of metal-oxide-semiconductor Q3 is connected with the colelctor electrode of triode Q4, the base stage of triode Q4
It is connected with the control signal output of MCU, the grounded emitter of triode Q4, the emitter stage of triode Q5 is with power supply just
Extremely it is connected, the colelctor electrode of triode Q5 is connected with the trigger signal input of control chip, the base stage and triode of triode Q5
The emitter stage of Q6 is connected, and the base stage of triode Q6 is connected with the trigger signal output end of MCU, the grounded collector of triode Q6,
The negative pole of power supply, the earth terminal of control chip, the earth terminal of MCU and electric discharge negative pole are grounded, and control chip also passes through
I2C buses are connected with MCU.
2. load short-circuit protection circuit as claimed in claim 1, it is characterised in that the load short-circuit protection circuit also includes
Diode D1, resistance R1, resistance R2 and resistance R3, the negative pole of diode D1 and one end of resistance R1 are with power supply just
Extremely it is connected, one end of the positive pole, the other end of resistance R1 and resistance R2 of diode D1 is by resistance R3 and control chip
Charge control end is connected, and the other end of resistance R2 is connected with the grid of metal-oxide-semiconductor Q1.
3. load short-circuit protection circuit as claimed in claim 1, it is characterised in that the load short-circuit protection circuit also includes
Diode D2, resistance R4, resistance R5 and resistance R6, the negative pole of diode D2, one end of resistance R6 are connected with electric discharge positive pole,
One end of the positive pole, the other end of resistance R6 and resistance R4 of diode D2 is by resistance R5 and the control of discharge of control chip
End is connected.
4. load short-circuit protection circuit as claimed in claim 1, it is characterised in that the load short-circuit protection circuit also includes
Resistance R7, resistance R8, resistance R9 and resistance R10, the grid of metal-oxide-semiconductor Q3 are connected with one end of resistance R7, the source of metal-oxide-semiconductor Q3
The other end of pole and resistance R7 is connected by resistance R8 with the colelctor electrode of triode Q4, and the base stage of triode Q4 passes through resistance R9
It is connected with the control signal output of MCU, the base stage of triode Q4 is also grounded by resistance R10.
5. load short-circuit protection circuit as claimed in claim 1, it is characterised in that the load short-circuit protection circuit also includes
Resistance R11, resistance R12, resistance R13, resistance R14, resistance R15 and resistance R16, the colelctor electrode of triode Q5 pass through resistance
R14 is connected with the trigger signal input of control chip, and the emitter stage of triode Q5 is by resistance R11 and the positive pole of power supply
It is connected, the emitter stage of triode Q5 is also connected by resistance R12 with the base stage of triode Q5, the base stage of triode Q5 is also by electricity
Resistance R13 is connected with the emitter stage of triode Q6, and the base stage of triode Q6 passes through the trigger signal output end phase of resistance R15 and MCU
Even, the base stage of triode Q6 is also grounded by resistance R16, the grounded collector of triode Q6.
6. the load short-circuit protection circuit as described in any one of Claims 1 to 5 claim, it is characterised in that control core
The model RAJ240045 of piece.
7. the load short-circuit protection circuit as described in any one of Claims 1 to 5 claim, it is characterised in that the confession
Power supply includes the battery of several series connection and/or parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621472313.8U CN206293889U (en) | 2016-12-30 | 2016-12-30 | A kind of load short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621472313.8U CN206293889U (en) | 2016-12-30 | 2016-12-30 | A kind of load short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206293889U true CN206293889U (en) | 2017-06-30 |
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ID=59097251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621472313.8U Active CN206293889U (en) | 2016-12-30 | 2016-12-30 | A kind of load short-circuit protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN206293889U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473742A (en) * | 2018-10-26 | 2019-03-15 | 深圳市睿德电子实业有限公司 | Battery short circuit dual-protection circuit |
| CN110518543A (en) * | 2019-09-02 | 2019-11-29 | 普联技术有限公司 | A kind of short-circuit protection circuit and power supply system |
-
2016
- 2016-12-30 CN CN201621472313.8U patent/CN206293889U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473742A (en) * | 2018-10-26 | 2019-03-15 | 深圳市睿德电子实业有限公司 | Battery short circuit dual-protection circuit |
| CN109473742B (en) * | 2018-10-26 | 2024-01-30 | 深圳市睿德电子实业有限公司 | Dual protection circuit for battery short circuit |
| CN110518543A (en) * | 2019-09-02 | 2019-11-29 | 普联技术有限公司 | A kind of short-circuit protection circuit and power supply system |
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