CN203851029U - Power supply circuit of intelligent interactive terminal - Google Patents
Power supply circuit of intelligent interactive terminal Download PDFInfo
- Publication number
- CN203851029U CN203851029U CN201420273332.2U CN201420273332U CN203851029U CN 203851029 U CN203851029 U CN 203851029U CN 201420273332 U CN201420273332 U CN 201420273332U CN 203851029 U CN203851029 U CN 203851029U
- Authority
- CN
- China
- Prior art keywords
- resistance
- oxide semiconductor
- metal oxide
- power supply
- interactive terminal
- 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.)
- Expired - Fee Related
Links
- 230000002452 interceptive effect Effects 0.000 title abstract 5
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 28
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 28
- 239000004065 semiconductor Substances 0.000 claims abstract description 28
- 230000005669 field effect Effects 0.000 claims abstract description 24
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 230000001052 transient effect Effects 0.000 claims description 7
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to the electronic technical field and specifically to a power supply circuit of an intelligent interactive terminal. The power supply circuit of the intelligent interactive terminal comprises a power supply end. The power supply end is divided into seven paths which are respectively connected with a first source electrode, a second source electrode and a third source electrode of a field effect transistor, one end of a first resistor, the emitter electrode of a first metal oxide semiconductor transistor, one end of a second resistor and the emitter electrode of a second metal oxide semiconductor transistor. Compared with the prior art, the designed power supply circuit structure has two metal oxide semiconductor transistors and one field effect transistor additionally arranged. When the voltage of the power supply end is larger than a rated voltage, the field effect transistor is then disconnected so that overvoltage protection can be performed on power sources of system chips and components of the intelligent interactive terminal. Components are prevented from being damaged due to power source overvoltages. The using cost of a user can be lowered. The service lifetime of the intelligent interactive terminal can be further prolonged.
Description
Technical field
The utility model relates to electronic technology field, specifically a kind of power circuit of smart-interactive terminal.
Background technology
At present, the system power supply of existing smart-interactive terminal is all generally to adopt low-tension supply, but in use, may, due to spread of voltage or charger problem, cause supply voltage suddenly higher than rated voltage.Power supply overvoltage meeting causes the damage of System on Chip/SoC and the components and parts of smart-interactive terminal, needs repairing and even changes parts.Like this, not only increase user's use cost, also shortened the useful life of smart-interactive terminal.
Therefore, need to design a kind of power circuit of the smart-interactive terminal that can realize overvoltage protection.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of power circuit of the smart-interactive terminal that can realize overvoltage protection is provided.
In order to achieve the above object, the utility model has designed a kind of power supply overvoltage protection circuit of smart-interactive terminal, comprise power end, it is characterized in that: power end Fen Qi road respectively with the source electrode one of field effect transistor, source electrode two, source electrode three, one end of resistance one, the emitter of metal oxide semiconductor transistor one, the emitter of one end of resistance two and metal oxide semiconductor transistor two connects, the drain electrode of field effect transistor divides two-way to be connected with the anode of diode one and the negative electrode of transient voltage twin zener dioder respectively, the negative electrode of diode one divides two-way to be connected with one end of resistance three and one end of electric capacity respectively, the other end of resistance three and the anodic bonding of light-emitting diode, the other end Fen Si road of electric capacity respectively with the negative electrode of light-emitting diode, the anode of transient voltage twin zener dioder, one end of resistance four and the anodic bonding of voltage stabilizing didoe, the other end Fen San road of resistance four respectively with the grid of field effect transistor, the negative electrode of the collector electrode of metal oxide semiconductor transistor two and diode two connects, after resistance of base stage series connection five of metal oxide semiconductor transistor two, be connected with the other end of resistance two, the anode of diode two is connected with the collector electrode of metal oxide semiconductor transistor one, after base stage series connection resistance six of metal oxide semiconductor transistor one, a point two-way is connected with the other end of resistance one and the negative electrode of voltage stabilizing didoe respectively.
The voltage of described power end is 5V.
The model of described field effect transistor is FDMS6681Z.
The utility model compared with the existing technology; design circuit construction of electric power; two metal oxide semiconductor transistors and a field effect transistor are set up; in the time that the voltage of power end is greater than rated voltage; cut off the connection of field effect transistor, thereby reach System on Chip/SoC to smart-interactive terminal and the overvoltage protection of components and parts power supply, avoided the parts damages that cause due to power supply overvoltage; reduce user's use cost, extended the useful life of smart-interactive terminal.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Now by reference to the accompanying drawings the utility model is described further.
Referring to Fig. 1, the utility model is a kind of power supply overvoltage protection circuit of smart-interactive terminal, comprises power end.Power end Fen Qi road respectively with the source electrode 1 of field effect transistor Q3, source electrode 22, source electrode 33, one end of resistance one R1, the emitter of metal oxide semiconductor transistor one Q1, the emitter of one end of resistance two R2 and metal oxide semiconductor transistor two Q2 connects, 5 points of two-way of drain electrode of field effect transistor Q3 are connected with the anode of diode one D1 and the negative electrode of transient voltage twin zener dioder D2 respectively, the negative electrode of diode one D1 divides two-way to be connected with one end of resistance three R3 and one end of capacitor C 1 respectively, the other end of resistance three R3 and the anodic bonding of light-emitting diode D3, the other end Fen Si road of capacitor C 1 respectively with the negative electrode of light-emitting diode D3, the anode of transient voltage twin zener dioder D2, one end of resistance four R4 and the anodic bonding of voltage stabilizing didoe D4, the other end Fen San road of resistance four R4 respectively with the grid 4 of field effect transistor Q3, the negative electrode of the collector electrode of metal oxide semiconductor transistor two Q2 and diode two D5 connects, after resistance five R5 of base stage series connection of metal oxide semiconductor transistor two Q2, be connected with the other end of resistance two R2, the anode of diode two D5 is connected with the collector electrode of metal oxide semiconductor transistor one Q1, after resistance six R6 of base stage series connection of metal oxide semiconductor transistor one Q1, a point two-way is connected with the other end of resistance one R1 and the negative electrode of voltage stabilizing didoe D4 respectively.
In the utility model, the voltage of power end is 5V.
Metal oxide semiconductor transistor one Q1, metal oxide semiconductor transistor two Q2 are binary channels triode, and model is MBT390DW1T1.
Field effect transistor Q3 is P-channel enhancement type field effect transistor, and model is FDMS6681Z.
The model of diode one D1 is SMLJ60S6.
The model of transient voltage twin zener dioder D2 is ESD9L5.0ST5G.
The model of voltage stabilizing didoe D4 is MMSZ5231BT1G.
Diode two D5 are the special based diode in school, and model is RB521CS-30.
The utility model is in the time of work, in the time that the voltage of power end is less than or equal to 5V, voltage stabilizing didoe D4 remain off state, the base stage of metal oxide semiconductor transistor one Q1 is high level, so metal oxide semiconductor transistor one Q1 cut-off, thereby the grid of field effect transistor Q3 4 keeps low level state, therefore field effect transistor Q3 keeps conducting state.Power supply 5V normally exports from the drain electrode 5 of field effect transistor Q3.
In the time that the voltage of power end is greater than 5V, because the Zener voltage of voltage stabilizing didoe D4 only has 5V left and right, therefore voltage stabilizing didoe D4 can be by Zener breakdown, and after the reverse conducting of voltage stabilizing didoe D4, resistance six R6 can keep zero potential with being pulled to.Because resistance one R1 no-voltage, so the base stage of metal oxide semiconductor transistor one Q1 is also no-voltage, thereby metal oxide semiconductor transistor one Q1 conducting, then diode two D5 forward conductions, so the grid 4 of field effect transistor Q3 keeps high level, field effect transistor Q3 remain off state, power supply 5V also just can not export from the drain electrode of field effect transistor Q3 5, and system power supply is closed.
Claims (3)
1. the power circuit of a smart-interactive terminal, comprise power end, it is characterized in that: power end Fen Qi road respectively with the source electrode one (1) of field effect transistor (Q3), source electrode two (2), source electrode three (3), one end of resistance one (R1), the emitter of metal oxide semiconductor transistor one (Q1), the emitter of one end of resistance two (R2) and metal oxide semiconductor transistor two (Q2) connects, the drain electrode (5) of field effect transistor (Q3) point two-way is connected with the anode of diode one (D1) and the negative electrode of transient voltage twin zener dioder (D2) respectively, the negative electrode of diode one (D1) divides two-way to be connected with one end of resistance three (R3) and one end of electric capacity (C1) respectively, the anodic bonding of the other end of resistance three (R3) and light-emitting diode (D3), the other end Fen Si road of electric capacity (C1) respectively with the negative electrode of light-emitting diode (D3), the anode of transient voltage twin zener dioder (D2), the anodic bonding of one end of resistance four (R4) and voltage stabilizing didoe (D4), the other end Fen San road of resistance four (R4) respectively with the grid (4) of field effect transistor (Q3), the negative electrode of the collector electrode of metal oxide semiconductor transistor two (Q2) and diode two (D5) connects, after a base stage resistance five of series connection (R5) of metal oxide semiconductor transistor two (Q2), be connected with the other end of resistance two (R2), the anode of diode two (D5) is connected with the collector electrode of metal oxide semiconductor transistor one (Q1), after a base stage resistance six of series connection (R6) of metal oxide semiconductor transistor one (Q1), a point two-way is connected with the other end of resistance one (R1) and the negative electrode of voltage stabilizing didoe (D4) respectively.
2. the power circuit of a kind of smart-interactive terminal according to claim 1, is characterized in that: the voltage of described power end is 5V.
3. the power circuit of a kind of smart-interactive terminal according to claim 1, is characterized in that: the model of described field effect transistor (Q3) is FDMS6681Z.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420273332.2U CN203851029U (en) | 2014-05-26 | 2014-05-26 | Power supply circuit of intelligent interactive terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420273332.2U CN203851029U (en) | 2014-05-26 | 2014-05-26 | Power supply circuit of intelligent interactive terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203851029U true CN203851029U (en) | 2014-09-24 |
Family
ID=51563997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420273332.2U Expired - Fee Related CN203851029U (en) | 2014-05-26 | 2014-05-26 | Power supply circuit of intelligent interactive terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203851029U (en) |
-
2014
- 2014-05-26 CN CN201420273332.2U patent/CN203851029U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203166467U (en) | Overvoltage protection circuit | |
| CN202513543U (en) | Overcurrent protection circuit | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN103762650B (en) | A kind of single USB port stand-by power supply based on equilibrium charging technology | |
| CN103474954A (en) | Overvoltage and undervoltage protective circuit based on three-end adjustable shunt reference source | |
| CN202513559U (en) | Battery short-circuit protection circuit | |
| CN204906185U (en) | Constant voltage power supply | |
| CN207782447U (en) | A kind of battery charging management circuit and bluetooth headset | |
| CN206564464U (en) | A kind of current foldback circuit without sample resistance | |
| CN204376381U (en) | For the overvoltage crowbar of LED high-voltage light bar | |
| CN203851029U (en) | Power supply circuit of intelligent interactive terminal | |
| CN204118791U (en) | The control protection electric circuit of portable power source | |
| CN206790150U (en) | One kind is with anti-reverse external mobile battery over-discharge protection circuit | |
| CN104052267B (en) | Multi-voltage transformation circuit | |
| CN205427684U (en) | Intelligence constant voltage power supply control circuit | |
| CN209526518U (en) | A kind of overvoltage crowbar and its Projecting Lamp | |
| CN204376382U (en) | For the protective circuit of LED high-voltage light bar | |
| CN204103480U (en) | A kind of charger reversal connection and short-circuit protection circuit | |
| CN203278357U (en) | Charging port circuit with overvoltage protection | |
| CN103280865A (en) | Charging port with over-voltage protection | |
| CN203562754U (en) | Over-voltage and under-voltage protective circuit based on three-end adjustable shunt reference source | |
| CN202840966U (en) | Power supply auxiliary circuit | |
| CN206211630U (en) | A kind of many charging modes band defencive function lithium battery charging circuits | |
| CN204243720U (en) | A kind of output short circuit protection circuit | |
| CN106300269A (en) | A kind of type voltage regulation overcurrent power-off indicating circuit |
Legal Events
| 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 |
Granted publication date: 20140924 Termination date: 20170526 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |