CN205960623U - Power protection circuit and have its circuit board - Google Patents
Power protection circuit and have its circuit board Download PDFInfo
- Publication number
- CN205960623U CN205960623U CN201620668463.XU CN201620668463U CN205960623U CN 205960623 U CN205960623 U CN 205960623U CN 201620668463 U CN201620668463 U CN 201620668463U CN 205960623 U CN205960623 U CN 205960623U
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- Prior art keywords
- electric capacity
- circuit
- power
- switch module
- electronic switch
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Abstract
The utility model relates to a power protection circuit and have its circuit board, wherein the power protection circuit includes the electronic switch module, first electric capacity, resistance and diode, the electronic switch module includes the input, output and control end, the input is connected with the input power, the output is connected with back level circuit module's initiating terminal, the first end and the input source phase of first electric capacity are connected, the second end of first electric capacity is connected with the one end of resistance, the other end ground connection of resistance, the anodal output with the electronic switch module of diode is connected, the negative pole of diode is connected with the second of first electric capacity end, the control end of electronic switch module is connected with the negative pole of diode. The utility model provides a circuit board, including foretell power protection circuit. The utility model provides a power protection circuit enables mains operated module and back level circuit module disconnection when the level circuit module short circuit of back, effectual protection back level circuit component does not receive short -circuit current's influence, has avoided causing because of the sustained short -circuit heavy current condition of power module damage simultaneously.
Description
Technical field
The utility model is related to electronic circuit field, more particularly, to a kind of power protecting circuit and the circuit board with it.
Background technology
Circuit board makes circuit miniaturization, directly perceivedization, the batch production for permanent circuit and optimize electrical appliance layout lifting
Act on.In design, checking, application, often there is power supply shorted to earth in circuit board at present.Electric current in circuit when short-circuit
Moment increases, and causes transformer, low tension switch, wire etc. to produce electromagnetic force and fuel factor, easily to front stage component IC
Cause expendable destruction.
Fig. 1 is a kind of power-supplying circuit schematic diagram of the prior art, power supply module 1 and late-class circuit module 2
It is joined directly together and it is powered, when a short circuit occurs, electronic device in power supply module 1 and late-class circuit module 2
All may be damaged.Therefore, it is necessary to be provided with protection circuit in power-supplying circuit.
Utility model content
The purpose of this utility model includes providing a kind of power protecting circuit, and described power protecting circuit includes electronic switch
Module, the first electric capacity, resistance and diode, described electronic switch module includes input, output end and control end, described input
End be connected with input power, described output end is connected with the initiating terminal of late-class circuit module, the first end of described first electric capacity and
Described input power is connected, and the second end of described first electric capacity is connected with one end of described resistance, the other end of described resistance
Ground connection, the positive pole of described diode is connected with the described output end of described electronic switch module, the negative pole of described diode and
Second end of described first electric capacity is connected, and the described control end of described electronic switch module is connected with the negative pole of described diode
Connect.
Further, described electronic switch module is relay system electronic switch or metal-oxide-semiconductor field effect transistor switch module.
Further, the voltage that described input power provides is more than 1.5V.
Further, the voltage that described input power provides is 1.5V, and described first electric capacity is 0.1uF, and described resistance is 1
Ω.
Further, described power protecting circuit also includes the second electric capacity, one end of described second electric capacity and described electronics
The described output end of switch module is connected, and the other end of described second electric capacity is connected with the negative pole of described diode.
Further, the size of described second electric capacity is less than or equal to 1/10th of the size of described first electric capacity.
Further, described first electric capacity is 0.1uF, and described second electric capacity is 0.01uF.
The utility model also provides a kind of circuit board, including above-mentioned power protecting circuit.
The power protecting circuit that the utility model provides is arranged between power supply module and late-class circuit module, this electricity
Protection circuit includes electronic switch module, the first electric capacity, resistance and diode, and when late-class circuit module short circuit, power supply is protected
Electronic switch module in protection circuit disconnects, thus power supply module and late-class circuit module disconnect, system reaches stably breaks
Open state, the power protecting circuit that the utility model provides is effectively protected late-class circuit element not to be affected by short circuit current,
Avoid the situation causing power module damage because of sustained short-circuit high current simultaneously.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, and in order to allow above and other purpose of the present utility model, feature
Can become apparent with advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, describe in detail as follows.
Brief description
Fig. 1 is a kind of power-supplying circuit schematic diagram of the prior art.
Fig. 2 is for having the power-supplying circuit schematic diagram of the power protecting circuit of the utility model offer.
Fig. 3 is the power protecting circuit schematic diagram of the utility model first embodiment.
Fig. 4 is the input power V of the power protecting circuit of the utility model first embodimentinV diagram.
Fig. 5 is the V diagram of the b node of power protecting circuit of the utility model first embodiment.
Fig. 6 is the power protecting circuit schematic diagram of the utility model second embodiment.
Specific embodiment
For further illustrating that the utility model is to reach technological means and effect that predetermined purpose is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to according to the utility model proposes a kind of specific embodiment of power protecting circuit, method, step
Suddenly, structure, feature and effect, after describing in detail such as.
Relevant of the present utility model aforementioned and other technology contents, feature and effect, in following cooperation with reference to schema relatively
Good embodiment can clearly present in describing in detail.By the explanation of specific embodiment, when can be to reach to the utility model
The technological means that one-tenth predetermined purpose is taken and effect are able to more deeply and specifically understand, but institute's accompanying drawings only carry
For reference with purposes of discussion, not it is used for the utility model is any limitation as.
Fig. 2 is for having the power-supplying circuit schematic diagram of the power protecting circuit of the utility model offer.Power in power supply
It is provided with power protecting circuit 3, one end of power supply module 1 and power protecting circuit 3 between module 1 and late-class circuit module 2
It is connected, the other end of power protecting circuit 3 is connected with late-class circuit module 2, power supply module 1 provides input power Vin, it is
Whole circuit is powered.
Fig. 3 is the power protecting circuit schematic diagram of the utility model first embodiment.The utility model first embodiment
Power protecting circuit includes electronic switch module 31, the first electric capacity C1, resistance R and diode D, and electronic switch module 31 includes defeated
Enter end, output end and control end, the input of electronic switch module 31 and input power VinConnect, input power VinFor direct current
Electricity, the output end of electronic switch module 31 is connected with the initiating terminal of late-class circuit module 2, the first end of the first electric capacity C1 and input
Power supply VinIt is connected, second end of the first electric capacity C2 is connected with one end of resistance R, the other end ground connection of resistance R, diode D's
Positive pole is connected with the output end of electronic switch module 31, and the negative pole of diode D is connected with second end of the first electric capacity C1, electricity
The control end of sub- switch module 31 is connected with the negative pole of diode D.Input power Vin, the first end of the first electric capacity C1 and electronics
The common port of the input of switch module 31 is node a, second end of the first electric capacity C1 and the control end of electronic switch module 31
And the common port of the negative pole of diode D is node b, the output end of electronic switch module 31, the positive pole of diode D and late-class circuit
The common port of the initiating terminal of module 2 is node c.
Please also refer to Fig. 3-5, Fig. 4 is the input power V of the power protecting circuit of the utility model first embodimentin's
V diagram.Fig. 5 is the V diagram of the b node of power protecting circuit of the utility model first embodiment.
When circuit does not go up electricity, input power VinFor 0, now node a, node b and node c tri- point voltage are all 0, electricity
Sub- switch module 31 and diode D are not turned on.As input power VinDuring upper electricity, the voltage V of a nodeaWith input power Vin's
Variation tendency is identical, as shown in figure 4, the voltage V of a nodeaPersistently rise until tending towards stability.Voltage V with a nodeaOn
Rise, the first electric capacity C1 is electrically charged, now b node voltage VbChange is as shown in figure 5, the voltage V of b nodebFirst rise, with first
Electric capacity C1 charges to stable, b node voltage VbZero, m point is discharged to through resistance R by peak and is VbPeak position.Its
In, the conducting voltage of the control end of electronic switch module 31 is VTH, as b node voltage VbOnce starting more than conducting from the ascent stage
Voltage VTHWhen, electronic switch module 31 is switched on, now c node voltage VcEqual to a node voltage Va, power supply module 1 is right
Late-class circuit module 2 is powered；As b node voltage VbConducting voltage V more than the control end of electronic switch module 31THWhen, electronics
Switch module 31 is in constant conduction state, such as n point in Fig. 5, now VbMore than conducting voltage VTH；As b node voltage VbUnder
Fall, until conducting voltage V of the control end less than electronic switch module 31TH, but now voltage drop VcbBe sized so that diode
During D conducting, b node voltage VbEqual to c node voltage VcIt is difference with diode D pressure drop, its size is more than electronic switch module
Conducting voltage V of 31 control endTH, then electronic switch keep stablize conducting state.
When short circuit in late-class circuit module 2, now VcThe voltage of point is 0, and diode D is not turned on, and b node passes through electricity
Resistance R electric discharge, as b node voltage VbDrop to conducting voltage V of the control end of electronic switch module 31THWhen following, electronic switch mould
Block 31 disconnects, and power supply module 1 and late-class circuit module 2 disconnect, and system reaches stable off-state.Only when re-powering
When, whole circuit could normal work.
In an embodiment of the present utility model, diode drop is 0.7V, the control end of electronic switch module 31
Conducting voltage VTHFor 0.65V, now input power VinWhole normal circuit operation can be made for more than 1.5V, i.e. a node voltage Va
For more than 1.5V it is preferable that input power VinCan be 1.5V.It is understood that input power VinValue, diode D
The size of model, the size of the first electric capacity C1 and resistance R is not fixed as a certain particular value, as long as cooperating, not
Same input power VinUnder the conditions of, the first electric capacity C1 and resistance R can be adjusted.In an embodiment of the present utility model, when
Input power VinThe voltage providing is 1.5V, and now the first electric capacity C1 can be 0.1uF, and resistance R is 1 Ω.The size shadow of resistance R
Ring VbThe speed of ground connection electric discharge, the value of resistance R is less, and electric discharge is faster.
In the utility model first embodiment, electronic switch module 31 can be relay system electronic switch or MOS field
Effect pipe switch module is it is to be understood that electronic switch module 31 is not limited to this, in other embodiments, electric
Sub- switch module 31 can be other electronic switches, as long as it can play on-off action, and opening of having that control end switched
Close.
The power protecting circuit that the utility model first embodiment provides is arranged at power supply module 1 and late-class circuit mould
Between block 2, this power protecting circuit includes electronic switch module 31, the first electric capacity C1, resistance R and diode D, works as late-class circuit
During module 2 short circuit, the electronic switch module 31 in power protecting circuit disconnects, thus power supply module 1 and late-class circuit mould
Block 2 disconnects, and system reaches stable off-state.The power protecting circuit that the utility model first embodiment provides is in late-class circuit
When there is shorted to earth in module 2, can deenergization in time, be effectively protected the shadow that late-class circuit element is not subject to short circuit current
Ring, avoid the situation causing power module damage because of sustained short-circuit high current simultaneously.
Fig. 6 is the power protecting circuit schematic diagram of the utility model second embodiment.The utility model second embodiment
Power protecting circuit includes the entire infrastructure of the power protecting circuit of first embodiment, and also includes the second electric capacity C2, wherein,
One end of second electric capacity C2 is connected with the output end of electronic switch module 31, the second electric capacity from the other end and diode D
Negative pole is connected.The size of the second electric capacity C2 than the size of the first electric capacity C1 little an order of magnitude it is preferable that the second electric capacity
The size of C2 is 1/10th of the size of the first electric capacity C1.In an embodiment of the present utility model, the first electric capacity C1 is
During 0.1uF, the second electric capacity C2 can be 0.01uF.
In b node voltage VbVoltage when rising, the second electric capacity C2 is charged to stable, as b node voltage VbMore than electronics
Conducting voltage V of the control end of switch module 31THWhen, electronic switch module 31 is in the conduction state, and power supply module 1 is to rear
Level circuit module 2 is powered.When short circuit in late-class circuit module 2, now VcThe voltage of point is 0, and diode D is not turned on, and b saves
Point voltage VbZero potential is pulled to rapidly by the second electric capacity C2, electronic switch module 31 disconnects, power supply module 1 and rear class are electric
Road module 2 disconnects, and system reaches stable off-state.By increasing by the second electric capacity C2, when short circuit in late-class circuit module 2
When, electronic switch module 31 disconnects faster, can play more preferable circuit protection effect.
The utility model also provides a kind of circuit board, provides including the utility model first embodiment or second embodiment
Power protecting circuit.
The above, be only the preferred embodiment of utility model, not the utility model is made any pro forma
Limit although the utility model is disclosed above with preferred embodiment, but be not limited to the utility model, any familiar
Professional and technical personnel, in the range of without departing from technical solutions of the utility model, when the technology contents of available the disclosure above
Make a little Equivalent embodiments changing or be modified to equivalent variations, as long as being without departing from technical solutions of the utility model content,
Any simple modification, equivalent variations and modification above example made according to technical spirit of the present utility model, all still belongs to
In the range of technical solutions of the utility model.
Claims (8)
1. a kind of power protecting circuit it is characterised in that described power protecting circuit include electronic switch module, the first electric capacity,
Resistance and diode, described electronic switch module includes input, output end and control end, and described input is with input power even
Connect, described output end is connected with the initiating terminal of late-class circuit module, the first end of described first electric capacity and described input power phase
Connect, the second end of described first electric capacity is connected with one end of described resistance, the other end ground connection of described resistance, described diode
Positive pole be connected with the described output end of described electronic switch module, the of the negative pole of described diode and described first electric capacity
Two ends are connected, and the described control end of described electronic switch module is connected with the negative pole of described diode.
2. power protecting circuit according to claim 1 is it is characterised in that described electronic switch module is relay system electricity
Son switch or metal-oxide-semiconductor field effect transistor switch module.
3. power protecting circuit according to claim 1 is it is characterised in that the voltage that described input power provides is more than
1.5V.
4. power protecting circuit according to claim 3 is it is characterised in that the voltage that described input power provides is
1.5V, described first electric capacity is 0.1uF, and described resistance is 1 Ω.
5. power protecting circuit according to claim 1 is it is characterised in that described power protecting circuit also includes the second electricity
Hold, one end of described second electric capacity is connected with the described output end of described electronic switch module, described second electric capacity another
End is connected with the negative pole of described diode.
6. power protecting circuit according to claim 5 is it is characterised in that the size of described second electric capacity is less than or equal to
/ 10th of the size of described first electric capacity.
7. power protecting circuit according to claim 6 it is characterised in that described first electric capacity be 0.1uF, described second
Electric capacity is 0.01uF.
8. a kind of circuit board is it is characterised in that described circuit board includes the power protection as any one of claim 1-7
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620668463.XU CN205960623U (en) | 2016-06-29 | 2016-06-29 | Power protection circuit and have its circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620668463.XU CN205960623U (en) | 2016-06-29 | 2016-06-29 | Power protection circuit and have its circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205960623U true CN205960623U (en) | 2017-02-15 |
Family
ID=57969226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620668463.XU Active CN205960623U (en) | 2016-06-29 | 2016-06-29 | Power protection circuit and have its circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205960623U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992492A (en) * | 2017-05-18 | 2017-07-28 | 努比亚技术有限公司 | A kind of current foldback circuit, power interface and mobile terminal |
| CN112294186A (en) * | 2019-07-31 | 2021-02-02 | 苏州市春菊电器有限公司 | Power consumption zero-power-consumption protection circuit of dust collector and protection method thereof |
-
2016
- 2016-06-29 CN CN201620668463.XU patent/CN205960623U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992492A (en) * | 2017-05-18 | 2017-07-28 | 努比亚技术有限公司 | A kind of current foldback circuit, power interface and mobile terminal |
| CN112294186A (en) * | 2019-07-31 | 2021-02-02 | 苏州市春菊电器有限公司 | Power consumption zero-power-consumption protection circuit of dust collector and protection method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |