CN202455057U - Power supply protecting circuit - Google Patents
Power supply protecting circuit Download PDFInfo
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- CN202455057U CN202455057U CN201220031553XU CN201220031553U CN202455057U CN 202455057 U CN202455057 U CN 202455057U CN 201220031553X U CN201220031553X U CN 201220031553XU CN 201220031553 U CN201220031553 U CN 201220031553U CN 202455057 U CN202455057 U CN 202455057U
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Abstract
The utility model relates to the field of electronic circuits and provides a power supply protecting circuit. The power supply protecting circuit comprises a power supply, a first electrolytic capacitor, a first capacitor, a second capacitor, a first diode, a first resistor, a second resistor, a first triode, a third resistor, a fourth resistor, a third capacitor, a second triode, a fifth resistor, a six resistor and a second MOS (Metal Oxide Semiconductor). With the adoption of the power supply protecting circuit provided by the embodiment of the utility model, the subsequent circuits can be protected effectively when a power supply voltage is connected inversely or an overhigh voltage is input.
Description
Technical field
The utility model relates to electronic circuit field, relates in particular to a kind of power protecting circuit.
Background technology
At computer, television set, STB, DVD, air-conditioning in the electronic products such as refrigerator, all can be used various power circuits, has produced various new units.In the application process of these new units, power protecting circuit is particularly important.If do not add the power protection circuit, when inserting overtension, will burn segment chip and circuit, make some afunction, even system's cisco unity malfunction, as crashing, anomaly such as can not start shooting.More existing circuit do not adopt protective circuit, but in specification, stress not wrong power supply, perhaps just insert a voltage-stabiliser tube and control required voltage; But when load is big; Circuit is cisco unity malfunction often, perhaps connects a voltage stabilizing chip, but when load current is very big; Chip power-consumption is very big, and the voltage stabilizing chip cost of ability super-high-current is higher.
Power protecting circuit commonly used at present adopts the voltage-stabiliser tube protection exactly.As shown in Figure 1, power circuit comprises resistance R 01, resistance R 02, electrochemical capacitor CE1, capacitor C 1, capacitor C 2, voltage stabilizing didoe D2.One termination power of resistance R 01 is anodal, the positive pole of a termination electrochemical capacitor CE1, and the minus earth of electrochemical capacitor CE1, capacitor C 1, an end of capacitor C 2 links to each other other end ground connection with electrochemical capacitor CE1 is anodal.One end of resistance R 02 links to each other with the positive pole of electrochemical capacitor CE1, the negative pole of another termination voltage stabilizing didoe D2, the plus earth of voltage stabilizing didoe D2.Out-put supply takes out from V1.
Resistance R 01 mainly plays the dividing potential drop effect, the resistance R 02 main metering function that rises.When system powers on, power supply process electrochemical capacitor CE1, capacitor C 1, capacitor C 2 filtering, required power supply is exported in voltage stabilizing through voltage-stabiliser tube.When the input power supply connects inverse time, will burn electrochemical capacitor CE1 and D2 back-end circuit; When load current requires when too high, the power supply of output maybe not can operate as normal.
Summary of the invention
The purpose of the utility model is to provide a kind of power protecting circuit, is intended to solve power supply and connects anti-or input voltage when big, protects follow-up circuit can not burn out.
The utility model is achieved in that a kind of power protecting circuit, power supply, and its positive pole is connected with first node, and negative pole is connected with Section Point; One end of first electrochemical capacitor is connected with first node, and the other end is connected with Section Point; One end of first electric capacity is connected with first node, and the other end is connected with Section Point; One end of second electric capacity is connected with first node, and the other end is connected with Section Point; Also comprise: the negative pole of first diode is connected with first node, and positive pole is connected with Section Point; One end of first resistance is connected with first node, and the other end is connected with the 3rd node; One end of second resistance is connected with the 3rd node, other end ground connection; The B utmost point of first triode is connected with the 3rd node, E utmost point ground connection, and the C utmost point is connected with an end of the 3rd resistance; The other end of the 3rd resistance is the supply voltage after filtering; Section Point ground connection wherein; One end of the 4th resistance is connected with the 4th node, and the other end is connected with the 5th node; One end of the 3rd electric capacity is connected with the 5th node, other end ground connection; The B utmost point of the 3rd triode is connected with the 5th node, E utmost point ground connection, and the C utmost point is connected with an end of the 5th resistance; The other end of the 5th resistance is connected with the 6th node; The G utmost point of the one PMOS pipe is connected with the 6th node, and the S utmost point is connected with the 7th node, and the D utmost point is connected with the 9th node; One end of the 6th resistance is connected with the 6th node, and the other end is connected with the 7th node; Wherein, the 9th node voltage is an output voltage.
More excellent, comprising that also an end of the 4th electric capacity is connected with the 9th node, the other end is connected with the 8th node; One end of the 7th resistance is connected with the 9th node, and the other end is connected with the 8th node; Wherein, the 8th node ground connection.
More excellent, also comprise processor, be connected with the B utmost point of first triode, be used for to the B of first triode utmost point incoming level.
More excellent, comprise that also first triode and the 3rd triode are NPN type triode.
A kind of power protecting circuit that adopts the utility model embodiment to provide when supply voltage connects anti-or input voltage when too high, can effectively be protected follow-up circuit.
Description of drawings
Fig. 1 is the circuit diagram of a kind of power protecting circuit of providing of prior art;
Fig. 2 is the circuit diagram of a kind of power protecting circuit of providing of the utility model;
Fig. 3 is the circuit diagram of the another kind of power protecting circuit that provided of the utility model second embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
A kind of power protecting circuit as shown in Figure 2, that the utility model first embodiment is provided specifically comprises:
Power supply CN1 is anodal to be connected with first node (N1), and power supply CN1 negative pole is connected with Section Point (N2).The positive pole of the first diode D1 is connected with N1, and the negative pole of D1 is connected with N2.The end of the first electrochemical capacitor CE1 is connected with N1, and the other end of CE1 is connected with N2.One end of first capacitor C 1 is connected with N1, and the other end of C1 is connected with N2.One end of second capacitor C 2 is connected with N1, and the other end of C2 is connected with N2.One end of first resistance R 1 is connected with N1, and the other end of R1 is connected with N3.One end of second resistance R 2 is connected with N3, the other end ground connection of R2.The B utmost point of the first triode Q1 is connected with N3, E utmost point ground connection, and the C utmost point is connected with an end of the 3rd resistance R 3.The other end of the 3rd resistance R 3 is taken over the supply voltage V1 after the filter.N2 ground connection wherein.
One end of the 4th resistance R 4 is connected with N4, and the other end is connected with N5.One end of the 3rd capacitor C 3 is connected with N5, other end ground connection.The B utmost point of the 3rd triode Q3 is connected with N5, E utmost point ground connection, and the C utmost point is connected with an end of the 5th resistance R 5.The other end of the 5th resistance R 5 is connected with N6.The G utmost point of PMOS pipe Q2 is connected with N6, and the S utmost point is connected with N7, and the D utmost point is connected with N9.One end of the 6th resistance R 6 is connected with N6, and the other end is connected with N7.Wherein, N9 voltage is Vout.
Power supply is through CE1, and C1 obtains V1 after the C2 filtering.Q1 is a NPN type triode, and the voltage at base stage B point place is obtained by R1 and R2 dividing potential drop, and the voltage at R2 two ends can be controlled the conducting of triode Q1 and end; Triode Q1 adopts the open collector way of output, and output is designated as STANDBY, and connects and draw resistance R 3 to power supply V1.Q3 is a NPN type triode, and the voltage of STANDBY can be controlled the conducting of triode Q3 and end.Q2 is the PMOS pipe, and its grid G is received the collector electrode C of Q3 through resistance R 5; The voltage at R6 two ends can be controlled the voltage at the drain D place of PMOS pipe Q2, and circuit output voltage is drawn from D.
Concrete, an end of the 4th capacitor C 4 is connected with N9, and the other end is connected with N8.One end of the 7th resistance R 7 is connected with N9, and the other end is connected with N8.Wherein, N8 ground connection.
When input voltage connects inverse time, electric current directly through diode D1 to ground, and can not burn the circuit of back.
When input voltage in normal range (NR) the time, like 5V voltage (error 5%), the value of configuration resistance R 1 and resistance R 2 makes the voltage at R2 two ends less than 0.5V; This moment, Q1 ended, because STANDBY has connect and drawn, the voltage of this point is high level; The Q3 conducting, the Q2 conducting, Vout output approximates V1.
When input voltage was too high, like the 12V input, the voltage at R2 two ends was higher than 1V, Q1 conducting this moment, and STANDBY voltage is low level, and Q3 ends, and Q2 ends, and Vout output approximates 0V.
A kind of power protecting circuit that adopts the utility model embodiment to provide when supply voltage connects anti-or input voltage when too high, can effectively be protected follow-up circuit.
The utility model second embodiment provide a kind of power protecting circuit, and is as shown in Figure 3, compares with first embodiment, increased:
Processor CPU or MCU are connected with the B utmost point of first triode, are used for to the B of first triode utmost point incoming level.
The layout of other elements of Fig. 3 with the effect with first embodiment in describe identical.
Owing to adopted the open collector gate circuit, this circuit can also be used as readiness control circuit.The B utmost point STANDBY of first triode is received control chip CPU, and the high-low level that outputs to protelum point N10 through control chip CPU is controlled the output of Vout.Thereby reduced circuit, saved space and cost.
Front end power supply V1 is when normal range (NR), and when N10 was high level, STANDBY voltage was high level, the Q3 conducting, and the Q2 conducting, Vout output approximates V1, circuit operate as normal; When N10 was low level, STANDBY voltage was low level, and Q3 ends, and Q2 ends, and Vout output approximates 0V, and the circuit that relies on the Vout power supply just to work will can not worked, and circuit is in holding state.
Front end power supply V1 is too high and by when protection, STANDBY voltage is low level, and Q3 ends, and Q2 ends, and Vout output approximates 0V.
A kind of power protecting circuit that adopts the utility model embodiment to provide when supply voltage connects anti-or input voltage when too high, can effectively be protected follow-up circuit.And control the holding state of entire circuit through CPU, and reduced circuit, provide cost savings.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (4)
1. a power protecting circuit comprises
Power supply, its positive pole is connected with first node, and negative pole is connected with Section Point;
One end of first electrochemical capacitor is connected with first node, and the other end is connected with Section Point;
One end of first electric capacity is connected with first node, and the other end is connected with Section Point;
One end of second electric capacity is connected with first node, and the other end is connected with Section Point;
It is characterized in that, also comprise:
The negative pole of first diode is connected with first node, and positive pole is connected with Section Point;
One end of first resistance is connected with first node, and the other end is connected with the 3rd node;
One end of second resistance is connected with the 3rd node, other end ground connection;
The B utmost point of first triode is connected with the 3rd node, E utmost point ground connection, and the C utmost point is connected with an end of the 3rd resistance; The other end of the 3rd resistance is the supply voltage after filtering;
Section Point ground connection wherein;
One end of the 4th resistance is connected with the 4th node, and the other end is connected with the 5th node;
One end of the 3rd electric capacity is connected with the 5th node, other end ground connection;
The B utmost point of the 3rd triode is connected with the 5th node, E utmost point ground connection, and the C utmost point is connected with an end of the 5th resistance;
The other end of the 5th resistance is connected with the 6th node;
The G utmost point of the one PMOS pipe is connected with the 6th node, and the S utmost point is connected with the 7th node, and the D utmost point is connected with the 9th node;
One end of the 6th resistance is connected with the 6th node, and the other end is connected with the 7th node;
Wherein, the 9th node voltage is an output voltage.
2. power protecting circuit as claimed in claim 1 is characterized in that, also comprises:
One end of the 4th electric capacity is connected with the 9th node, and the other end is connected with the 8th node;
One end of the 7th resistance is connected with the 9th node, and the other end is connected with the 8th node;
Wherein, the 8th node ground connection.
3. power protecting circuit as claimed in claim 1 is characterized in that, also comprises:
Processor is connected with the B utmost point of first triode, is used for to the B of first triode utmost point incoming level.
4. like claim 1 or 2 or 3 described power protecting circuits, it is characterized in that, also comprise
First triode and the 3rd triode are NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220031553XU CN202455057U (en) | 2012-02-01 | 2012-02-01 | Power supply protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220031553XU CN202455057U (en) | 2012-02-01 | 2012-02-01 | Power supply protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202455057U true CN202455057U (en) | 2012-09-26 |
Family
ID=46870887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220031553XU Expired - Fee Related CN202455057U (en) | 2012-02-01 | 2012-02-01 | Power supply protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202455057U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219016A (en) * | 2013-04-16 | 2013-07-24 | 广东欧珀移动通信有限公司 | Compact disk player circuit |
| CN107749611A (en) * | 2017-11-16 | 2018-03-02 | 盈帜科技（常州）有限公司 | A kind of overvoltage crowbar |
| CN108683514A (en) * | 2018-05-07 | 2018-10-19 | 浙江大华技术股份有限公司 | A kind of power supply circuit and for electric installation |
-
2012
- 2012-02-01 CN CN201220031553XU patent/CN202455057U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219016A (en) * | 2013-04-16 | 2013-07-24 | 广东欧珀移动通信有限公司 | Compact disk player circuit |
| CN103219016B (en) * | 2013-04-16 | 2015-08-19 | 广东欧珀移动通信有限公司 | A kind of Compact disk player circuit |
| CN107749611A (en) * | 2017-11-16 | 2018-03-02 | 盈帜科技（常州）有限公司 | A kind of overvoltage crowbar |
| CN108683514A (en) * | 2018-05-07 | 2018-10-19 | 浙江大华技术股份有限公司 | A kind of power supply circuit and for electric installation |
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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: 20120926 Termination date: 20150201 |
|
| EXPY | Termination of patent right or utility model |