CN103856053B - There is the power-supply controller of electric of overpower protection - Google Patents
There is the power-supply controller of electric of overpower protection Download PDFInfo
- Publication number
- CN103856053B CN103856053B CN201210514639.2A CN201210514639A CN103856053B CN 103856053 B CN103856053 B CN 103856053B CN 201210514639 A CN201210514639 A CN 201210514639A CN 103856053 B CN103856053 B CN 103856053B
- Authority
- CN
- China
- Prior art keywords
- power
- overpower
- electric
- pulse width
- width modulating
- 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.)
- Active
Links
Abstract
A kind of power-supply controller of electric a, it is possible to provide pulse width modulating signal, in order to control a power switch.This power-supply controller of electric includes a pulse width modulating signal generator, one first agitator, one second agitator and an overpower detector.This pulse width modulating signal generator is in order to produce this pulse width modulating signal.This first agitator is coupled to this pulse width modulating signal generator, can determine a switch periods of this pulse width modulating signal.This second agitator may be used to determine the overpower protection time.This overpower detector is in order to detect whether an overpower event occurs.When this overpower event duration reaches this overpower protection time, this pulse width modulating signal this power switch continuously off.
Description
Technical field
The present invention is the protection mechanism about power supply unit, and espespecially the overpower about switch type power supplying device is protected
Protect.
Background technology
Power supply unit is a kind of electronic installation essential to most electronic product, is used for battery or civil power, conversion
Required by electronic product is become to ask and have the power supply of specific standard.In numerous power supply units, switch type power supplying utensil
There are superior energy conversion efficiency and small and exquisite small product size, so extensively being welcome by power supply industry.
Power supply unit is the most only to fit to output voltage/electric current and high energy conversion efficiency accurately, also must
Need possess protection mechanism during many generation unusual conditions.General protection mechanism known to industry has overpower protection, mistake
Voltage protection, overcurrent protection, excessively high temperature protection etc..
Printer or notebook computer often have short time high-power electrical energy demands.As a example by printer, one
As printer may be at standby for a long time or receive signal, it is only necessary to have typically or very low power consumption；But in short-term
Between printing operation time, just need very high power consumption.For the cost of manufacture of economization power supply unit and reach this
Plant particular application, so in specification, power supply unit just has so-called normal power (normal power) and peak power
(peak power), the corresponding power supply maximum admissible power when normal operating operates with ultra high power is defeated respectively
Go out.Once the output of power supply unit exceeds normal power, and when such high-power output continue for long-time,
Overpower protection can be triggered.For example, US patent number 7486493 provides for a kind of electricity with overpower protection
Source supply.
In this specification, there is identical labeled elements or device, for having identical or similar functions, structure or spy
Property element or device, can learn with the tool teaching of this specification or deduce for people in the industry, but phase the most completely
With.For succinct reason, will not repeat specification.
Summary of the invention
Embodiments of the invention disclose a kind of power-supply controller of electric, it is possible to provide a pulse width modulating signal, in order to control one
Power switch.This power-supply controller of electric includes a pulse width modulating signal generator, one first agitator, one second vibration
Device and an overpower detector.This pulse width modulating signal generator is in order to produce this pulse width modulating signal.This is years old
One agitator is coupled to this pulse width modulating signal generator, can determine a switch periods of this pulse width modulating signal.
This second agitator may be used to determine the overpower protection time.Whether this overpower detector is in order to detect an overpower event
Occur.When this overpower event duration reaches this overpower protection time, this pulse width modulating signal is continuously off should
Power switch.
Accompanying drawing explanation
Fig. 1 shows the power supply unit implemented according to the present invention.
Fig. 2 shows in one embodiment of this invention, cycle signal SCYCCycle frequency fCYCAnd clock signal STIMER
Clock frequency fTIMER, to compensating voltage VCOMRelation.
Fig. 3 A display offset amount VOFFSETWith input power VINThe relation of voltage.
Fig. 3 B display offset amount VOFFSETWith opening time TONRelation.
[main element label declaration]
10 power supply unit 12 transformators
14 power switch 15 load
16 compensate electric capacity 18 operational amplifier
20 power-supply controller of electric 22 agitators
24 diode 26 resistance
28 resistance 30 comparators
31 PWM generator 32 protect module
34 comparator 36 comparators
37 agitator 38 OCP enumerators
40 gate 42 OPP enumerators
COM compensates end fCYCCycle frequency
fTIMERClock frequency ICSElectric current
PRM main winding (primary winding) RCSCurrent sense resistor
SCYCCycle signal SEC Secondary Winding
SPWMPulse width modulating signal STIMERClock signal
TONOpening time VCOMCompensate voltage
VCOM-HPredeterminated voltage VCOM-LPredeterminated voltage
VCSCurrent detection signal VCS-LIMITCurrent limiting signal
VINInput power VOFFSETSide-play amount
VOPPOverpower voltage VOUTOut-put supply
VSLOPESlope-compensation voltage VTARTarget voltage
Detailed description of the invention
Fig. 1 shows the power supply unit 10 implemented according to the present invention, and it has overpower protection and over current protection
Protect.Although power supply unit 10 is a flyback (flyback) power supply changeover device (powerconverter), but the present invention is not
It is limited to this, present invention can be suitably applied to any power supply unit.Seem reducing transformer (Buck converter) or booster
(booster)。
Input power (line power source) VINCan be produced through over commutation by an electric main, its voltage may
Up to 280V.Power switch 14 controls to flow through the electric current I of main winding (primarywinding) PRM of transformator 12CS, it passes through
Current sense resistor RCS, it is converted into current detection signal VCS.Current detection signal VCSAbout represent electric current ICS.Work as power switch
During 14 conducting, input power VINTransformator 12 energy storage is made to increase.When power switch 14 is closed, transformator 12 passes through Secondary Winding
(secondary winding) SEC releases can, it is established that out-put supply VOUT, to load 15 power supply.According to out-put supply VOUTWith mesh
Mark voltage VTARDifference, operational amplifier 18 drives and compensates electric capacity 16, sets up out compensation voltage V compensating on end COMCOM.Electricity
Source controller 20 is according to compensating voltage VCOM, produce pulse width modulating signal SPWM, its periodically switch power switch 14.Electricity
Source controller 20 provides a loop, it is desirable to by out-put supply VOUTIt is stable at target voltage VTAR.For example, the highest compensation
Voltage VCOM, pulse width modulating signal SPWMHaving the biggest working cycle (duty cycle), transformator 12 is to out-put supply VOUT
The output of transmission is the highest.Because out-put supply VOUTAbout it is stable at target voltage VTAR, high compensation voltage VCOM, simultaneously
Also out-put supply V has been meanedOUTThe load 15 powered is heavier.
Power supply unit 10 can be implemented by a secondary side control mode (secondary side control), it is also possible to
Implement by primary side control mode (primary side control).Secondary side control mode is by the message of secondary side, logical
Cross optical coupling element to pass to primary side and control.And primary side control there is no optical coupling element, directly detect and control assist around
Cross-pressure in group.
In one embodiment, power-supply controller of electric 20 has agitator 22, and it provides cycle signal SCYC, periodically by arteries and veins
Rush width modulated generator 31, make pulse width modulating signal SPWMFor " 1 " in logic, open power switch 14.Cycle signal
SCYCDetermine pulse width modulating signal SPWMSwitch periods in, opening time TONThe starting point of (logic is " 1 ").Implement at other
In example, cycle signal SCYCMay decide that cycle signal SCYCMay decide that pulse width modulating signal SPWMIn, shut-in time TOFF
The starting point of (logical zero).One switch periods includes an opening time TONAnd a shut-in time TOFF.Compensate voltage VCOMWarp
Cross diode 24 blood pressure lowering, after resistance 26 and 28 dividing potential drop, limit current detection signal VCSPeak value.As current detection signal VCS
Rise to compensate voltage VCOMSlope-compensation voltage V is subtracted outSLOPETime, comparator 30, by PWM generator 31,
Make pulse width modulating signal SPWMFor " 0 " in logic, close power switch 14, determine shut-in time TOFFBeginning.?
In one embodiment, slope-compensation voltage VSLOPEAlong with opening time TONIncrease and increase.
In protection module 32, it is provided that overcurrent protection and overpower protection.Comparator 34 and 36 detected electricity respectively
Whether stream event and overpower event occur.Agitator 37 is independent of agitator 22, it is provided that clock signal STIMER, for protection mould
Used by block 32 timing.
Comparator 34 compares current detection signal VCSAnd a current limiting signal VCS-LIMIT.As current detection signal VCS
With side-play amount VOFFSETSum, if it exceeds current limiting signal VCS-LIMITTime, comparator 34 assert that overcurrent event starts to send out
Raw.OCP enumerator 38, after overcurrent event starts to occur, starts counting up.OCP enumerator 38 is with clock signal STIMERAs time
Clock, calculates overcurrent event and the most persistently reaches the overcurrent protection time.If overcurrent event the most persistently occurs
Reaching the overcurrent protection time just disappears, and OCP enumerator 38 just resets to 0, and stops counting.For example, 38, enumerator
Existing overcurrent event duration reaches clock signal STIMERDuring defined 100 clocks, enumerator 38 will pass through gate 40,
Make the pulse width modulating signal S that PWM generator 31 exportsPWMIt is fixed on " 0 " in logic, continuously off power
Switch 14, to reach overcurrent protection.
Similarly, comparator 36 compares compensation voltage VCOMThe overpower voltage V whether preset more than oneOPP.When compensating electricity
Pressure VCOMExceed default overpower voltage VOPP, comparator 36 assert one overpower event occur, OPP enumerator 42 is according to clock
Signal STIMER, start counting up.When OPP enumerator 42 finds that overpower event duration reaches the overpower protection time, example
As said, the count results of OPP enumerator 42 reaches 1000 clock signals STIMERDefined clock, OPP enumerator 42 will pass through patrols
Collect door 40, make the pulse width modulating signal S that PWM generator 31 exportsPWMIt is fixed as " 0 " in logic, continues
Close power switch 14, to reach overpower protection.Similarly, if when overpower event duration occurs not reach overpower protection
Time just disappears, and OPP enumerator 42 just resets to 0, and stops counting.
In one embodiment, the overcurrent protection time is shorter than the overpower protection time.
Fig. 2 shows in one embodiment of this invention, cycle signal SCYCCycle frequency fCYCAnd clock signal STIMER
Clock frequency fTIMER, to compensating voltage VCOMRelation.When underloading, for example, compensate voltage VCOMLess than predeterminated voltage
VCOM-L, cycle frequency fCYCIt is 0 or a 22KHz the lowest, so can enjoy than relatively low handoff loss (switching
Loss), the conversion efficiency of power supply unit 10 is improved.When compensating voltage VCOMBetween predeterminated voltage VCOM-L-With predeterminated voltage VCOM-H
Between time, cycle frequency fCYCLinear with compensating voltage VCOMChange.When compensating voltage VCOMBetween predeterminated voltage VCOM-HArrived merit
Rate voltage VOPPTime, it is meant that heavy duty, cycle frequency fCYCFor the highest 60KHz.For example, if power supply unit 10
Overpower amount is 15 watts, and that represents compensation voltage VCOMAt overpower voltage VOPPTime neighbouring, the output work of power supply unit 10
Rate should be about 15 watts.Compensate voltage VCOMExceed overpower voltage VOPPTime, cycle frequency fCYCIt is quickly raised to
100KHz, with higher cycle frequency, provides peak power in short time, and it is higher than overpower amount, even up to overpower
The output of amount twice.
In one embodiment, voltage V is compensatedCOMWhen height exceedes certain value, agitator 37 just starts vibration, it is provided that clock is believed
Number STIMER, and its clock frequency fTIMERIt is about certain value, not with compensating voltage VCOMAnd change.Fig. 2 read clock frequency
fTIMERCompensating voltage VCOMHigher than predeterminated voltage VCOM-H-Time just occur, and its clock frequency fTIMERAbout it is fixed as 22KHz.
Compensating voltage VCOMLess than predeterminated voltage VCOM-HMiddle load or during underloading, agitator 37 nonoscillatory, power-supply controller of electric can be reduced
The internal loss of 20, increases conversion efficiency.
As a example by using power supply unit 10 as the power supply of printer, when printer is when typically carrying operation (not printing),
Compensate voltage VCOMCan design at overpower voltage VOPPBelow.The super-heavy load mode of operation of printing it is in once printer,
Compensate voltage VCOMOverpower voltage V will be exceededOPP, comparator 36 assert that overpower event occurs, and OPP enumerator 42 starts meter
Number.Once super-heavy load mode of operation the most long (exceed the overpower protection time), will assert that printer operation is wrong, mistake
Power protection is triggered, and power supply unit 10 stops electromotive power output.If compensating voltage VCOMAlso do not have at OPP enumerator 42
Before arriving the overpower protection time, just it is returned to less than overpower voltage VOPP, that means that printer is in super-heavy load operation
Time be in the reasonable scope, OPP enumerator 42 will be made zero, and overpower protection will not be triggered.
In one embodiment, by agitator 37 independent of agitator 22 can obtain the more accurate overpower protection time with
The overcurrent protection time.As shown in Figure 2, for the consideration of conversion efficiency, cycle frequency f produced by agitator 22CYC, its
Value can be along with compensating voltage VCOMAnd change.But, this measure but can cause the puzzlement in timing.For example, 100 circulation letters
Number SCYCThe physical length of cycle period, it will along with compensating voltage VCOMTrail change, and have different results.Therefore,
Independent agitator 37, produced clock signal STIMERAbout fixing clock frequency fTIMER, it is used for calculating overpower thing
The time span that part occurs with overcurrent event, will be relatively accurately with stable, no longer along with compensating voltage VCOMTrack and become
Change.So, the overvoltage protection time will compare precisely with the overcurrent protection time.
Fig. 3 A shows in one embodiment, is used in side-play amount V of overcurrent protectionOFFSET, with input power VINVoltage
Relation.As input power VINTime the highest, side-play amount VOFFSETThe highest.In other words, at current detection signal VCSDuring rising, compare
High input power VINThe comparator 34 in Fig. 1 can be caused relatively early to assert the generation of overcurrent event.So, it is provided that suitable
When line voltage compensation (linecompensation).Good line voltage compensation, when overcurrent protection can be made to trigger, output
Power supply VOUTOn output loading 15 be one the most not with input power VINThe certain value of change.In various embodiments, defeated
Enter power supply VINDetection can have different methods.For example, power-supply controller of electric 20 can detect and turn at power switch 14
Time, inductive, in the cross-pressure of auxiliary winding (auxiliarywinding) of transformator 12, reaches to detect input power VIN
Purpose.A bleeder circuit is had to be coupled to input power V in another embodimentINAnd between earth lead, bleeder circuit provides
Ratio is in input power VINVoltage division signal, affect side-play amount VOFFSET.In another embodiment, side-play amount VOFFSETAlong with
The crest voltage of electric main raises and increases, it is also possible to reach suitable line voltage compensation.
Good line voltage compensation, it would however also be possible to employ side-play amount VOFFSETAlong with pulse width modulating signal SPWMUnlatching time
Between (ON time) TONIncrease and diminish to reach, as shown in Fig. 3 B.Opening time TONIt is pulse width modulating signal SPWMPosition
In the time of logical one, namely power switch 14 maintains the time of conducting.Power supply unit 10 has identical output
Under, comparatively short opening time TON, meaned input power VINThe highest.Therefore, side-play amount V in Fig. 3 BOFFSETWith unlatching
Time TONRelation, the line voltage compensation caused, may the line voltage compensation that can be caused with Fig. 3 A, the most close.
Embodiments of the invention can obtain more accurate overpower protection time and overcurrent protection time.Additionally, this
Inventive embodiment also provides for side-play amount VOFFSETWith input power VINOr side-play amount VOFFSETWith opening time TONRelation, can
To reach good line voltage compensation.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the invention as claimed with
Modify, all should belong to the covering scope of the present invention.
Claims (10)
1. a power-supply controller of electric, has overpower protection, and it provides a pulse width modulating signal, opens in order to control a power
Close, include:
One pulse width modulating signal generator, in order to produce this pulse width modulating signal；
One first agitator, is coupled to this pulse width modulating signal generator, determines that the one of this pulse width modulating signal opens
The pass cycle；
One second agitator, in order to determine the overpower protection time；And
One overpower detector, in order to detect whether an overpower event occurs；
Wherein, when this overpower event duration reaches this overpower protection time, this pulse width modulating signal persistently closes
Close this power switch,
This first agitator is controlled by a compensation voltage,
When this compensation voltage is more than a preset value, the second agitator just starts vibration.
Power-supply controller of electric the most according to claim 1, wherein, this compensation voltage is associated with an output of a power supply unit
Power.
Power-supply controller of electric the most according to claim 2, wherein, this overpower detector compares this compensation voltage and one pre-
If overpower voltage.
Power-supply controller of electric the most according to claim 1, also includes:
One enumerator, is coupled to this second agitator, the most persistently reaches this overpower guarantor in order to calculate this overpower event
Protect the time.
Power-supply controller of electric the most according to claim 1, also includes:
One over-current detector, in order to detect whether an overcurrent event occurs；
Wherein, this second agitator is also in order to determine the overcurrent protection time, when this overcurrent event duration reaches this mistake
During the current protection time, this pulse width modulating signal this power switch continuously off.
Power-supply controller of electric the most according to claim 5, wherein, this over-current detector compare a current detection signal and
One current limiting signal, this current detection signal represents the electric current flowing through an inductance element.
Power-supply controller of electric the most according to claim 6, wherein, when current detection signal and a side-play amount and more than this electricity
During ductility limit signal, this over-current detector assert that this overcurrent event occurs.
Power-supply controller of electric the most according to claim 7, wherein, this side-play amount is associated with the input at this inductance element
An input power.
Power-supply controller of electric the most according to claim 7, wherein, this side-play amount is associated with at this pulse width modulating signal
One opening time.
Power-supply controller of electric the most according to claim 5, also includes:
One overpower enumerator and an overcurrent enumerator, be both coupled to this second agitator, crosses merit in order to calculating this respectively
Rate event the most persistently reaches this overpower protection time, the most persistently reaches this overcurrent protection with this overcurrent event
Time；
Wherein, this overcurrent protection time is shorter than this overpower protection time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210514639.2A CN103856053B (en) | 2012-12-04 | 2012-12-04 | There is the power-supply controller of electric of overpower protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210514639.2A CN103856053B (en) | 2012-12-04 | 2012-12-04 | There is the power-supply controller of electric of overpower protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103856053A CN103856053A (en) | 2014-06-11 |
| CN103856053B true CN103856053B (en) | 2016-08-24 |
Family
ID=50863350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210514639.2A Active CN103856053B (en) | 2012-12-04 | 2012-12-04 | There is the power-supply controller of electric of overpower protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103856053B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI508406B (en) * | 2014-08-07 | 2015-11-11 | Power Forest Technology Corp | Power conversion apparatus and over power protection method thereof |
| TWI542102B (en) * | 2014-10-06 | 2016-07-11 | 力林科技股份有限公司 | Power conversion apparatus and over power protection method thereof |
| CN105870874B (en) * | 2016-04-28 | 2019-11-29 | 上海斐讯数据通信技术有限公司 | A kind of current foldback circuit |
| CN109839525B (en) * | 2019-03-13 | 2021-02-02 | 深圳市鼎阳科技股份有限公司 | Over-power protection method and protection device for electronic load |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM275624U (en) * | 2005-04-11 | 2005-09-11 | System General Corp | An over-power protection apparatus |
| CN102237811A (en) * | 2010-04-22 | 2011-11-09 | 通嘉科技股份有限公司 | Controller and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001275345A (en) * | 2000-03-27 | 2001-10-05 | Sony Corp | Power supply unit |
-
2012
- 2012-12-04 CN CN201210514639.2A patent/CN103856053B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM275624U (en) * | 2005-04-11 | 2005-09-11 | System General Corp | An over-power protection apparatus |
| CN102237811A (en) * | 2010-04-22 | 2011-11-09 | 通嘉科技股份有限公司 | Controller and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103856053A (en) | 2014-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1333499C (en) | Semiconductor laser driving current control method and multi-mode working driving power supply | |
| CN103138587B (en) | Switching power supply | |
| CN204030996U (en) | A kind of reverse exciting switching voltage regulator circuit | |
| TWI463778B (en) | Current mode buck-boost converter and direct current voltage converting method thereof | |
| TWI583114B (en) | Power controller with over power protection | |
| CN101605417B (en) | LED constant current drive circuit with light dimming function | |
| CN102497103B (en) | High efficiency DC-DC conversion device in light load | |
| CN101841248B (en) | Power supply apparatus | |
| CN104734510B (en) | Switch power supply and control chip thereof | |
| CN103107707B (en) | Resonant conversion circuit and resonant controller | |
| CN103368143B (en) | Current mode switch power supply overpower-protection circuit | |
| CN102158080A (en) | Voltage converter and control method thereof | |
| CN102594137A (en) | System and method for controlling a switched-mode power supply | |
| CN103269548A (en) | LED drive circuit system, controller and control method | |
| CN103856053B (en) | There is the power-supply controller of electric of overpower protection | |
| CN103475216A (en) | Power converter, clock module, control circuit and related control method | |
| CN101283502A (en) | Power supply device and electronic device provided with same | |
| CN203416160U (en) | Synchronous rectification controller and power converter using the synchronous rectification controller | |
| CN105529799A (en) | Charging system based on secondary control and secondary control device thereof | |
| CN106160418A (en) | A kind of control method of Switching Power Supply | |
| CN101527990A (en) | Light emitting diode driving circuit | |
| TW201535947A (en) | Switching-mode power supplies | |
| CN105978340A (en) | Power converter, switch control circuit and short circuit detection method for current sensing resistor of the power converter | |
| CN101651336B (en) | Distribution protection method and distribution protection device | |
| CN109412212A (en) | A kind of tandem type high voltage electric field inductive power supply circuit of two-stage variation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |