CN104410050B - A kind of protection circuit of Switching Power Supply - Google Patents
A kind of protection circuit of Switching Power Supply Download PDFInfo
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- CN104410050B CN104410050B CN201410789945.6A CN201410789945A CN104410050B CN 104410050 B CN104410050 B CN 104410050B CN 201410789945 A CN201410789945 A CN 201410789945A CN 104410050 B CN104410050 B CN 104410050B
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Abstract
A kind of protection circuit of Switching Power Supply; including information acquisition module, set module, time delay module and judge module; information acquisition module sampling abnormal signal is exported to set module; set module and time delay module receive the output feedback signal of judge module, the output difference connection judgment module of set module and time delay module simultaneously.When there is abnormal conditions to produce, abnormal signal is high level, and judge module is transferred to by set module, and judge module exports a low level signal, and power management chip is stopped.When during the output signal low level of judge module, the set of set module is high level, and abnormal signal does not influence the output of set module, time delay module meeting time delay to export a low level, then judge module output is changed into high level, and chip will recover normal work.
Description
Technical field
The invention belongs to field of switch power, more particularly to a kind of protection circuit of Switching Power Supply.
Background technology
With the high speed development of Power Electronic Technique, the work of power electronic equipment and people, the relation of life are increasingly close
Cut, and electronic equipment all be unable to do without reliable power supply.The characteristics of Switching Power Supply is due to its small portable is widely used in industry certainly
Dynamicization control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication apparatus, power equipment, instrument and meter, medical treatment set
Standby, semiconductor refrigerating is heated, air purifier, electronic refrigerator, liquid crystal display, LED lamp, communication apparatus, audio-visual products, peace
The field such as anti-, computer housing, digital product and instrument class.Switching Power Supply is to utilize modern power electronics technology, controlling switch pipe
The time of turn-on and turn-off maintains a kind of equipment of output voltage stabilization or outputting current steadily.
In Switching Power Supply, to carrying out protection with very important by irregular working caused by emergency case in circuit
Meaning.As a example by applying the Switching Power Supply in mobile unit, the Switching Power Supply in mobile unit can set to external electricity consumption
Available electricity, wherein with the most use is the charging of the portable sets such as mobile phone, panel computer and in-car TV.When on-vehicle battery is supplied
When electricity output crosses flow short-circuit, the safety of vehicle can be had a strong impact on；Meanwhile, the output voltage of on-vehicle battery contains very big voltage point
Peak, it is possible to break Switching Power Supply, it is also possible to because the voltage being added in the electrical equipments such as external mobile phone, panel computer
It is excessive, and damage electrical equipment.The protection circuit that general Switching Power Supply is taken, when emergency case is tackled, is all directly cut-out
Power management chip.But this can be present, when abnormal working position is eliminated caused by emergency case, core is managed
Piece can not automatically recover normal work.
The content of the invention
It is an object of the invention to provide a kind of protection circuit of Switching Power Supply, it is intended to solving in Switching Power Supply circuit not just
When normal working condition is eliminated, power management chip can automatically recover the problem of normal work.
What the present invention was realized in：A kind of protection circuit of Switching Power Supply, it is characterised in that：Including information gathering mould
The Switching Power Supply that sampling is obtained is included peak point current by block, set module, time delay module and judge module, information acquisition module
To set module, whether the output of time delay module and set module is separately input into judgement to abnormal signal output with output voltage
Module, the output of judge module as the protection circuit of Switching Power Supply output and simultaneously feedback link to set module and time delay
Module, wherein：
Set module includes that a d type flip flop DFF7 for rising edge triggering, its clear terminal R connect the upper of power management chip
Electric signal RT, electricity RT becomes high level on chip, and powering down chips RT becomes low level, and set end S is connected as the judgement of feed back input
The output RB of module, clock end connection clock signal clk, the abnormal signal of D input link informations acquisition module output, Q ends
Output connection judgment module；
Time delay module includes 6 d type flip flop DFF1~DFF6, not gate NOT and clock generation module, d type flip flop DFF1's
Clear terminal R connects the power on signal RT of chip, set end S connection VCC, work clock CLK, the D input of clock end connection chip
The input of output RB, the Q ends output connection not gate NOT of connection judgment module is held, the output end of not gate NOT is triggered with D respectively
The set end S connections of device DFF2, d type flip flop DFF3, d type flip flop DFF4, d type flip flop DFF5 and d type flip flop DFF6, d type flip flop
The clear terminal R of DFF2, d type flip flop DFF3, d type flip flop DFF4, d type flip flop DFF5 and d type flip flop DFF6 is all connected with power on signal
RT, d type flip flop DFF2, d type flip flop DFF3, d type flip flop DFF4, d type flip flop DFF5 and d type flip flop DFF6 clock end CLK it is equal
The clock signal clk 1 of connection clock generation module output, the D inputs of d type flip flop DFF2 are connected as the judgement of feed back input
The D inputs of the Q ends output connection d type flip flop DFF3 of the output RB of module, d type flip flop DFF2, the Q ends of d type flip flop DFF3 are defeated
Go out to connect the D inputs of d type flip flop DFF4, the D inputs of the Q ends output connection d type flip flop DFF5 of d type flip flop DFF4, D triggerings
The D inputs of the Q ends output connection d type flip flop DFF6 of device DFF5；
Judge module include NAND gate NAND and with door AND, NAND gate NAND an input connection set module in D
The Q ends output of trigger DFF7, the Q ends of d type flip flop DFF6 are defeated in another input connection time delay module of NAND gate NAND
Go out, output connection and an input of door AND of NAND gate NAND are connected power on signal with another input of door AND
RT, the output RB with the protection circuit that door AND is output as Switching Power Supply.
The protection process of the protection circuit of Switching Power Supply is as follows：It is when two of judge module are input into high level simultaneously, then defeated
Go out a low level signal；In two inputs of judge module, when having one and more than one input signal low level, then export
One high level signal；When the Switching Power Supply that information acquisition module sampling is obtained includes that peak point current and output voltage are electricity high
Usually, abnormal conditions are indicated, when the output signal of protective circuit of switch power source is low level, by the set mould of output control
Block output is mutually all high level with abnormal signal, is also high level by the time delay module output of output control；When there is abnormal conditions
During generation, abnormal signal is high level, and high level is transferred into judge module by set module, and judge module is output as low electricity
Flat, power management chip is stopped；When the output signal of protection circuit is low level, the input of set module set end is low
Level, the output set of set module is high level, and now abnormal signal does not influence the output of set module, and time delay module can postpone
Low level is output as after a period of time, judge module output high level, i.e. protective circuit of switch power source are output as high level, electricity
Source control chip recovers normal work, and set module transmits abnormal signal again.
Advantages of the present invention and significant effect：The protection circuit that general Switching Power Supply is taken tackle emergency case when,
All it is managing chip of directly cutting off the electricity supply, when abnormal working position is eliminated caused by emergency case, managing chip can not be certainly
Dynamic recovery normal work.When the present invention can solve the problem that circuit abnormal working position is eliminated in Switching Power Supply, power management core
Piece can automatically recover normal work.
Brief description of the drawings
Fig. 1 is theory diagram of the invention；
Fig. 2 implements circuit diagram for one kind of the invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention are clearer, below with reference to drawings and Examples, to this
Invention is further elaborated.Described embodiment is to explain the present invention, and what is be not intended to limit the present invention makes
With.
Such as Fig. 1, protective circuit of switch power source of the present invention is including information acquisition module, the set module by output control and prolongs
When module and judge module, the Switching Power Supply that obtains of sampling includes peak point current and output voltage by information acquisition module
Abnormal signal is exported to set module, set module and time delay module while receiving the output feedback signal of judge module, set
The output difference connection judgment module of module and time delay module, the output of judge module is the defeated of protective circuit of switch power source
Go out.
When the output signal of protection circuit is high level, set module set end is high level, and the transmission of set module is different
Regular signal；When the output signal of protection circuit is low level, set module set end is high level, and abnormal signal does not influence to put
The output of position module, set module output is always high level.
When the output signal of protection circuit is high level, time delay module exports a high level signal；Work as protection circuit
Output signal low level when, time delay module can time delay for a period of time afterwards export a low level signal.
Two of judge module inputs simultaneously high level when, then export a low level signal, have one and more than one
During input signal low level, then a high level signal is exported.
When the output signal high level of protective circuit of switch power source, by the abnormal letter of set module transmission of output control
Number, high level is exported by the time delay module of output control.When there is abnormal conditions to produce, abnormal signal is high level, by putting
Position module is transferred to judge module, and judge module exports a low level signal, and power management chip is stopped.When protection electricity
During the output signal low level on road, the set of set module is high level, and abnormal signal does not influence the output of set module, time delay mould
Block meeting time delay exports a low level, then judge module output is changed into the output signal of high level, i.e. protective circuit of switch power source
High level, chip will recover normal work, and the set module transmits the abnormal signal again.
Fig. 2 shows that one kind of Fig. 1 implements circuit diagram.
Used as one embodiment of the invention, the unusual condition in the abnormal signal reaction circuit is produced by information acquisition module
Raw, high level indicates abnormal conditions.Different occasions needs unusual condition to be protected, and protection output electricity is needed in some occasions
Stream is protected to temperature, then gather output current information and temperature information, the then abnormal signal when temperature and current anomaly
It is high level.
It is that (D of the present embodiment is triggered a d type flip flop by the set module of output control as one embodiment of the invention
Device is all rising edge triggering), trigger DFF7 has clear terminal R, set end S, clock CLK, D end and Q ends.Clear terminal and set
End is all Low level effective, and Protection Counter Functions connects low level simultaneously prior to set function (set is high level), namely R and S,
D type flip flop resets.RT is the power on signal of chip, i.e., electricity on chip one, and RT is high level.RB is the output letter of protection circuit
Number.R termination RT, S termination RB, Clk termination global clock (work clock of chip) CLK, D termination abnormal signals of DFF7.Q ends
Output connects the input of judge module.
As one embodiment of the invention, by the time delay module of output control by 6 d type flip flops, a not gate NOT and clock
Generation module is constituted.6 triggers all have clear terminal R, set end S, clock CLK, D end and Q ends.Clear terminal and set end are all
It is low level high level, and Protection Counter Functions connects low level simultaneously prior to set function, namely R and S, d type flip flop resets.RT is
Electricity in the power on signal of chip, i.e. chip one, RT is high level.Clock generation module produces a clock signal for fixed frequency
(clock frequency determines that frequency smaller time delay is bigger according to time delay), this clock signal can control the time of delay
Size.R termination RT, S the termination VCC of DFF1, the clock signal clk that Clk terminated clocks generation module is produced, Q termination not gates NOT
Input, the output of R termination RT, the S terminations not gate NOT of DFF2~DFF6, the clock letter that Clk terminated clocks generation module is produced
D the terminations RB, Q of number CLK1, DFF2 terminate the D ends of DFF3, and the Q of DFF3 terminates the D ends of DFF4, and the Q of DFF4 terminates the D of DFF5
End, the Q of DFF5 terminates the D ends of DFF6, and the Q of DFF6 terminates the input of judge module.
Used as one embodiment of the invention, judge module is constituted by a NAND gate NAND and with door AND, NAND gate NAND's
Two inputs connect the output of set module and time delay module.The output of NAND connect with one of door AND input, AND another
Input is RT, and the output of AND is the output RB of protection circuit.
The course of work of protection circuit is：
Once upper electricity, RT is high level to protection circuit, above abnormal signal (0 the represent low level without exception) NAND that is 0
One input is output as 1 for 0, NAND, the output RB of protection circuit for 1 (1 represents high level, output RB is 1, then power supply
Managing chip normal work), the output of DFF1 is changed into 1, and the set end (S) of 0, DFF2~DFF6 is reversely changed into by not gate NOT
All 0, it is output as 1.
When there is abnormal conditions to occur, abnormal signal is that 1, DFF7 output ends overturn, and is changed into two inputs of 1, NAND
End is all that two inputs that 1, NAND is output as 0, AND are 1 and 0, and output RB is changed into 0, and power management chip is stopped.Now
DFF7 set ends are output as 1 for 0, DFF7.DFF1 is output as 0, and the set end that 1, DFF2~DFF6 is changed into by NOT is all 1,
The D ends input of DFF2 is 0, and by five clock cycle (CLK1), 0 signal at the D ends of DFF2 is transferred to by chain of flip-flops
Input below NAND, NAND upsets are output as 1 for 1, AND.After RB is changed into 1, it is arrived in the rising edge clock of DFF7
When, DFF7 receives the input of collection information module again, and adds the purpose of DFF1 to arrive it also in rising edge clock
When just to time delay module set be 1.If not adding DFF1, when time delay module set is 1, the output of DFF7 can still keep
One clock cycle, DFF7 outputs are still 1, and RB can be made to be changed into 0.The automatic of power management chip is so just completed to restart, and
And reopen defencive function.
More than only be one embodiment of the present of invention, be not intended to limit the invention, it is all it is of the invention spirit and
Any modification, equivalent and improvement for being made within principle etc., should be included within the scope of the present invention.
Claims (2)
1. a kind of protection circuit of Switching Power Supply, it is characterised in that：Including information acquisition module, set module, time delay module and
Judge module, information acquisition module will sample the Switching Power Supply that obtains include peak point current and output voltage whether the letter of exception
To set module, the output of time delay module and set module is separately input into judge module, and the output of judge module is made for number output
For Switching Power Supply protection circuit output and simultaneously feedback link to set module and time delay module, wherein：
Set module includes a d type flip flop DFF7 for rising edge triggering, the clear terminal R connection power managements of d type flip flop DFF7
The power on signal RT of chip, electricity RT becomes high level on chip, and powering down chips RT becomes low level, and the set end S of d type flip flop DFF7 connects
Connect as the output RB of the judge module of feed back input, the work clock CLK, D of the clock end connection chip of d type flip flop DFF7 are tactile
The abnormal signal of the D input link informations acquisition module output of hair device DFF7, the Q ends output connection judgment of d type flip flop DFF7
Module；
Time delay module includes 6 d type flip flop DFF1~DFF6, not gate NOT and clock generation module, the clearing of d type flip flop DFF1
End R connects the power on signal RT of chip, the clock end connection core of set end S the connections VCC, d type flip flop DFF1 of d type flip flop DFF1
The output RB of the D input connection judgment modules of the work clock CLK of piece, d type flip flop DFF1, the Q ends of d type flip flop DFF1 are defeated
Go out to connect the input of not gate NOT, the output end of not gate NOT respectively with d type flip flop DFF2, d type flip flop DFF3, d type flip flop
The set end S connections of DFF4, d type flip flop DFF5 and d type flip flop DFF6, d type flip flop DFF2, d type flip flop DFF3, d type flip flop
The clear terminal R of DFF4, d type flip flop DFF5 and d type flip flop DFF6 is all connected with power on signal RT, d type flip flop DFF2, d type flip flop
The clock end CLK of DFF3, d type flip flop DFF4, d type flip flop DFF5 and d type flip flop DFF6 is all connected with the output of clock generation module
Clock signal clk 1, the D inputs of d type flip flop DFF2 connect the output RB as the judge module of feed back input, d type flip flop
The D inputs of the Q ends output connection d type flip flop DFF3 of DFF2, the D of the Q ends output connection d type flip flop DFF4 of d type flip flop DFF3
Input, the D inputs of the Q ends output connection d type flip flop DFF5 of d type flip flop DFF4, the Q ends output connection D of d type flip flop DFF5
The D inputs of trigger DFF6；
Judge module include NAND gate NAND and with door AND, NAND gate NAND an input connection set module in D triggering
The Q ends output of device DFF7, the Q ends output of d type flip flop DFF6 in another input connection time delay module of NAND gate NAND, with
Output connection and an input of door AND of not gate NAND, power on signal RT is connected with another input of door AND, with
Door AND is output as the output RB of the output of the protection circuit of Switching Power Supply, the output signal i.e. judge module.
2. the protection circuit of Switching Power Supply according to claim 1, its protection process is as follows：Two inputs of judge module are same
When high level when, then export a low level signal；In two inputs of judge module, there are one or more input signals
During low level, then a high level signal is exported；When the Switching Power Supply that information acquisition module sampling is obtained includes peak point current
During with output voltage for high level, abnormal conditions are indicated, when the output signal of protective circuit of switch power source is low level, by
The set module output of output control is mutually all high level with abnormal signal, is also electricity high by the time delay module output of output control
It is flat；When there is abnormal conditions to produce, abnormal signal is high level, and high level is transferred into judge module by set module, is sentenced
Disconnected module is output as low level, and chip will be stopped；When the output signal of protection circuit is low level, set module set
End input is low level, and the output set of set module is high level, and now abnormal signal does not influence the output of set module, time delay
Module is output as low level after postponing a period of time, judge module exports the output of high level, i.e. protective circuit of switch power source
It is high level, chip will recover normal work, and set module transmits the abnormal signal again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410789945.6A CN104410050B (en) | 2014-12-18 | 2014-12-18 | A kind of protection circuit of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410789945.6A CN104410050B (en) | 2014-12-18 | 2014-12-18 | A kind of protection circuit of Switching Power Supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104410050A CN104410050A (en) | 2015-03-11 |
| CN104410050B true CN104410050B (en) | 2017-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410789945.6A Expired - Fee Related CN104410050B (en) | 2014-12-18 | 2014-12-18 | A kind of protection circuit of Switching Power Supply |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2100900C1 (en) * | 1996-12-03 | 1997-12-27 | Конкордий Иннокентьевич Харазов | Delay line |
| CN101478308A (en) * | 2009-01-13 | 2009-07-08 | 北京时代民芯科技有限公司 | Configurable frequency synthesizer circuit based on time-delay lock loop |
| CN102035190A (en) * | 2010-12-23 | 2011-04-27 | 上海贝岭股份有限公司 | Over-current protection circuit |
| CN201813147U (en) * | 2010-10-09 | 2011-04-27 | Bcd半导体制造有限公司 | Short circuit protection circuit of switching power |
-
2014
- 2014-12-18 CN CN201410789945.6A patent/CN104410050B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2100900C1 (en) * | 1996-12-03 | 1997-12-27 | Конкордий Иннокентьевич Харазов | Delay line |
| CN101478308A (en) * | 2009-01-13 | 2009-07-08 | 北京时代民芯科技有限公司 | Configurable frequency synthesizer circuit based on time-delay lock loop |
| CN201813147U (en) * | 2010-10-09 | 2011-04-27 | Bcd半导体制造有限公司 | Short circuit protection circuit of switching power |
| CN102035190A (en) * | 2010-12-23 | 2011-04-27 | 上海贝岭股份有限公司 | Over-current protection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 开关电源芯片用三级过流保护电路的设计;庄华龙等;《半导体技术第35卷增刊》;20100731;第35卷;62-64,73 * |
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| Publication number | Publication date |
|---|---|
| CN104410050A (en) | 2015-03-11 |
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Granted publication date: 20170616 Termination date: 20211218 |