CN102983553B - Switching Power Supply overload protection method and device - Google Patents
Switching Power Supply overload protection method and device Download PDFInfo
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- CN102983553B CN102983553B CN201210470223.5A CN201210470223A CN102983553B CN 102983553 B CN102983553 B CN 102983553B CN 201210470223 A CN201210470223 A CN 201210470223A CN 102983553 B CN102983553 B CN 102983553B
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Abstract
The invention discloses a kind of Switching Power Supply overload protection method and device, described Switching Power Supply overload protection method comprises the following steps: the error current feedback voltage level obtaining Switching Power Supply; Judge the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of Switching Power Supply; If so, then within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of Switching Power Supply, the error current feedback voltage level step performing and obtain Switching Power Supply is returned; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of Switching Power Supply, then control switch power supply quits work; If not, then the step performing the error current feedback voltage level obtaining Switching Power Supply is returned.Present invention reduces the cost of the overload protecting circuit of the larger resistive load of variation, because this reducing the cost of Switching Power Supply, being more suitable for industrial production.<!--1-->
Description
Technical field
The present invention relates to switch power technology field, particularly a kind of Switching Power Supply overload protection method and device.
Background technology
Switching Power Supply high frequency is the direction of its development, and high frequency makes Switching Power Supply miniaturized, and makes Switching Power Supply enter application widely, particularly in the application of high-technology field, has promoted the miniaturization of new high-tech product, lighting.In addition the development and apply of Switching Power Supply in energy savings, economize on resources and all have great importance in protection of the environment.Switching Power Supply is when output overloading and short circuit; for protection power source and load are not damaged; the method of the peak current of usual limit switch pipe limits the maximum power of output; but when load is when changing larger resistive load; then need the power device selecting power larger, because this increasing the cost of power device.
Summary of the invention
Main purpose of the present invention is to provide a kind of Switching Power Supply overload protection method, is intended to the cost of the overload protecting circuit reducing the larger resistive load of variation.
In order to realize goal of the invention, the invention provides a kind of Switching Power Supply overload protection arrangement, described Switching Power Supply overload protection arrangement comprises acquisition module, judge module and control module; Wherein,
Acquisition module, for obtaining the error current feedback voltage level of Switching Power Supply;
Judge module, for judging the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply; If then within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of described Switching Power Supply, return the error current feedback voltage Value Operations being performed described acquisition Switching Power Supply by acquisition module; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of described Switching Power Supply, then quit work by control module control switch power supply, otherwise perform the error current feedback voltage Value Operations of described acquisition Switching Power Supply by acquisition module.
Preferably, described judge module also for, judge the 3rd Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the greatest limit power of described Switching Power Supply; If so, then perform described control switch power supply by described control module to quit work operation; Otherwise continue to judge the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply.
Preferably, described judge module comprises the first comparator, the second comparator and the 3rd comparator, and the error current feedback signal of described Switching Power Supply is connected to the in-phase input end of the first comparator, the reverse input end of the second comparator and the input in the same way of the 3rd comparator respectively; The reverse input end of the first comparator connects the level signal that a magnitude of voltage equals the first Error Feedback magnitude of voltage, the input in the same way of the second comparator connects the level signal that a magnitude of voltage equals the second Error Feedback magnitude of voltage, and the reverse input end of the 3rd comparator connects the level signal that a magnitude of voltage equals the 3rd Error Feedback magnitude of voltage.
Preferably, described control module comprises the first rest-set flip-flop, timer or logical circuit and the second rest-set flip-flop, wherein the set end of the first rest-set flip-flop is connected with the output of the first comparator, and the reset terminal of the second rest-set flip-flop is connected with the under-voltage locking end of Switching Power Supply; The start end of timer is connected with the positive output end of the first rest-set flip-flop, and reset terminal is connected with the negative output terminal of the first rest-set flip-flop; Or the first input end of logical circuit is connected with the output of timer, the second input is connected with the output of the 3rd comparator, and output is connected with the set end of the second rest-set flip-flop; The positive output end of described second rest-set flip-flop is held with the BIAS of Switching Power Supply and is connected.
The present invention also provides a kind of Switching Power Supply overload protection method, and this Switching Power Supply overload protection method comprises the following steps:
Obtain the error current feedback voltage level of Switching Power Supply;
Judge the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply;
If so, then within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of described Switching Power Supply, the error current feedback voltage level step performing described acquisition Switching Power Supply is returned; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of described Switching Power Supply, then control switch power supply quits work;
If not, then the step of the error current feedback voltage level performing described acquisition Switching Power Supply is returned.
Preferably, perform described judge whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply time the first Error Feedback magnitude of voltage step before also comprise:
Judge the 3rd Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the greatest limit power of described Switching Power Supply;
If so, then control switch power supply quits work;
If not, then described the first Error Feedback magnitude of voltage step when judging whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply is performed.
The present invention is by obtaining the error current feedback voltage level of Switching Power Supply; the first Error Feedback magnitude of voltage during maximum peak power simultaneously by this current Error Feedback magnitude of voltage and Switching Power Supply compares; until when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage; control switch power supply quits work, thus realizes the overload protection to Switching Power Supply.Because the present invention realizes overload protection by relative error feedback voltage level to load; be not only applicable to change larger resistive load; simultaneously without the need to increasing the cost of power device; thus reduce the cost of the overload protecting circuit of the larger resistive load of variation, and then reduce the cost of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of Switching Power Supply overload protection method one embodiment of the present invention;
Fig. 2 is the schematic flow sheet of another embodiment of Switching Power Supply overload protection method of the present invention;
Fig. 3 is the structural representation of Switching Power Supply overload protection arrangement one embodiment of the present invention;
Fig. 4 is the electrical block diagram of Switching Power Supply overload protection arrangement one embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to the schematic flow sheet that Fig. 1, Fig. 1 are Switching Power Supply overload protection method one embodiment of the present invention.The Switching Power Supply overload protection method that the present embodiment provides comprises the following steps:
Step S10, obtains the error current feedback voltage level of Switching Power Supply;
In the present embodiment, in Switching Power Supply, being provided with error feedback signal, by obtaining this error feedback signal, thus obtaining error current feedback voltage level.
Step S20, judges the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of Switching Power Supply; If then perform step S30, then perform step S10 if not.
Step S30, within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of described Switching Power Supply, returns the error current feedback voltage level step performing described acquisition Switching Power Supply; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of described Switching Power Supply, then control switch power supply quits work.
After getting error current feedback voltage level, this current Error Feedback magnitude of voltage and the first Error Feedback magnitude of voltage are compared, the Error Feedback magnitude of voltage of this first Error Feedback magnitude of voltage for producing during Switching Power Supply maximum peak power.And until when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage, when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage, judge, within the first preset time period, whether error current feedback voltage level is less than the second Error Feedback magnitude of voltage; If be less than the second Error Feedback magnitude of voltage, then judge that Switching Power Supply is as transshipping once in a while, does not now need the work of shutdown switch power supply, thus return and continue to obtain error current feedback voltage level and whether be less than the first Error Feedback magnitude of voltage; If within this first preset time period, error current feedback voltage level is in the state being more than or equal to the second Error Feedback magnitude of voltage always, then control switch power supply quits work.Therefore, the present invention can effectively prevent Switching Power Supply from causing misoperation because circuit is unstable.
The present invention is by obtaining the error current feedback voltage level of Switching Power Supply; the first Error Feedback magnitude of voltage during maximum peak power simultaneously by this current Error Feedback magnitude of voltage and Switching Power Supply compares; until when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage; control switch power supply quits work, thus realizes the overload protection to Switching Power Supply.Because the present invention realizes overload protection by relative error feedback voltage level to load; be not only applicable to change larger resistive load; simultaneously without the need to increasing the cost of power device; thus reduce the cost of the overload protecting circuit of the larger resistive load of variation, and then reduce the cost of Switching Power Supply.
Further, reference Fig. 2, Fig. 2 is the schematic flow sheet of another embodiment of Switching Power Supply overload protection method of the present invention.Based on above-described embodiment, in the present embodiment, also comprised before execution above-mentioned steps S20:
Step S40, judges the 3rd Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the greatest limit power of Switching Power Supply; If so, then step S50 is performed; Otherwise perform step S20.
Step S50, control switch power supply quit work.
In this embodiment; during the 3rd Error Feedback magnitude of voltage when error current feedback voltage level is greater than the maximum power of Switching Power Supply; then control switch power supply quits work; damage Switching Power Supply to prevent Switching Power Supply from transshipping, therefore the Switching Power Supply overload protection method that provides of the present embodiment can protective efficient switch power supply further.
The present invention also provides a kind of Switching Power Supply overload protection arrangement, for realizing said method.With reference to the structural representation that Fig. 3, Fig. 3 are Switching Power Supply overload protection arrangement one embodiment of the present invention.The Switching Power Supply overload protection unit that the present embodiment provides comprises acquisition module 100, judge module 200 and control module 300; Wherein,
Acquisition module 100, for obtaining the error current feedback voltage level of Switching Power Supply;
In the present embodiment, in Switching Power Supply, being provided with error feedback signal, by obtaining this error feedback signal, thus obtaining error current feedback voltage level.
Judge module 200, for judging the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of Switching Power Supply; If then within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of described Switching Power Supply, return and perform by acquisition module 100 the error current feedback voltage Value Operations obtaining Switching Power Supply; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of described Switching Power Supply, then quit work by control module 300 control switch power supply, otherwise performed the error current feedback voltage Value Operations obtaining Switching Power Supply by acquisition module 100.
After acquisition module 100 gets error current feedback voltage level, export this current Error Feedback magnitude of voltage to judge module 200, by judge module 200, error current feedback voltage level and the first Error Feedback magnitude of voltage are compared, the Error Feedback magnitude of voltage of this first Error Feedback magnitude of voltage for producing during Switching Power Supply maximum peak power.And until when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage, judge, within the first preset time period, whether error current feedback voltage level is less than the second Error Feedback magnitude of voltage; If front Error Feedback magnitude of voltage is less than the second Error Feedback magnitude of voltage, then judge that Switching Power Supply is as transshipping once in a while, now do not need the work of shutdown switch power supply, thus return and continue to obtain error current feedback voltage level by acquisition module 100 and whether be less than the first Error Feedback magnitude of voltage; If within this first preset time period, error current feedback voltage level is in the state being more than or equal to the second Error Feedback magnitude of voltage always, then quit work by control module 300 control switch power supply.Therefore, the present invention can effectively prevent Switching Power Supply from causing misoperation because circuit is unstable.
The present invention obtains the error current feedback voltage level of Switching Power Supply by acquisition module 100; compared by the first Error Feedback magnitude of voltage during the maximum peak power of judge module 200 by this current Error Feedback magnitude of voltage and Switching Power Supply simultaneously; until when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage; quit work by control module 300 control switch power supply, thus realize the overload protection to Switching Power Supply.Because the present invention realizes overload protection by relative error feedback voltage level to load; be not only applicable to change larger resistive load; simultaneously without the need to increasing the cost of power device; thus reduce the cost of the overload protecting circuit of the larger resistive load of variation, and then reduce the cost of Switching Power Supply.
Further, above-mentioned judge module 200 also for, judge when error current feedback voltage level is greater than the first Error Feedback magnitude of voltage, and within the first preset time period, whether error current feedback voltage level is less than the second Error Feedback magnitude of voltage during the maximum average power of Switching Power Supply; If so, then perform by acquisition module 100 the error current feedback voltage Value Operations obtaining Switching Power Supply; Otherwise perform control switch power supply by control module 200 to quit work operation.
Further, above-mentioned judge module 200 also for, judge the 3rd Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the greatest limit power of Switching Power Supply; If so, then perform control switch power supply by control module 300 to quit work operation; Otherwise continue to judge the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of Switching Power Supply.
In this embodiment; during the 3rd Error Feedback magnitude of voltage when error current feedback voltage level is greater than the maximum power of Switching Power Supply; then quit work by control module 300 control switch power supply; damage Switching Power Supply to prevent Switching Power Supply from transshipping, therefore the Switching Power Supply overload protection arrangement that provides of the present embodiment can protective efficient switch power supply further.
In conjunction with the electrical block diagram with reference to Fig. 4, Fig. 4 being Switching Power Supply overload protection arrangement one embodiment of the present invention.In the present embodiment, above-mentioned judge module 200 can comprise the first comparator U1, the second comparator U2 and the 3rd comparator U3.The error feedback signal of Switching Power Supply is connected to the input in the same way of the in-phase input end of the first comparator U1, the reverse input end of the second comparator U2 and the 3rd comparator U3 respectively; The reverse input end of the first comparator U1 connects the level signal V1 that a magnitude of voltage equals the first Error Feedback magnitude of voltage, the input in the same way of the second comparator U2 connects the level signal V2 that a magnitude of voltage equals the second Error Feedback magnitude of voltage, and the reverse input end of the 3rd comparator U3 connects the level signal V3 that a magnitude of voltage equals the 3rd Error Feedback magnitude of voltage.
Above-mentioned control module 300 comprises the first rest-set flip-flop U4, timer U5 or logical circuit U6 and the second rest-set flip-flop U7, and wherein the set end of the first rest-set flip-flop U4 is connected with the output of the first comparator U1; The start end of timer U5 is connected with the positive output end of the first rest-set flip-flop U4, and reset terminal is connected with the negative output terminal of the first rest-set flip-flop U4; Or the first input end of logical circuit U6 is connected with the output of timer U5, the second input is connected with the output of the 3rd comparator U3, and output is connected with the set end of the second rest-set flip-flop U7; The reset terminal of the second rest-set flip-flop and the UVLO (UnderVoltageLockOut, under-voltage locking) of Switching Power Supply hold and connect, and positive output end is held with the BIAS of Switching Power Supply and is connected.
When error current feedback voltage level is greater than the 3rd error voltage value, 3rd comparator U3 by output one high level to or second input of logical circuit U6, to make or logical circuit U6 exports the reset terminal of high level to a second rest-set flip-flop U7, now the positive output end of the second rest-set flip-flop U7 exports a low level and holds to the BIAS of Switching Power Supply, and then control switch power supply quits work.
When error current feedback voltage level is greater than the first error voltage value, and when being less than the 3rd error voltage value, first comparator U1 exports the set end of high level to the first rest-set flip-flop U4, thus make the positive output end of the first rest-set flip-flop U4 export the start end of a high level to timer U5, timer U5 starts timing, after timer arrives above-mentioned first preset time period, export a high level to or the first input end of logical circuit U6, to make or logical circuit U6 exports the reset terminal of high level to a second rest-set flip-flop U7, now the positive output end of the second rest-set flip-flop U7 exports a low level and holds to the BIAS of Switching Power Supply, and then control switch power supply quits work.
Timing is started at timer U5, and when not reaching for the first preset time period, if when error current feedback voltage level is less than the second error voltage value, then the first comparator U1 output low level, the second comparator U2 exports high level; Thus making the positive output end output low level of the first rest-set flip-flop U4, negative output terminal exports high level, and then resets to timer U5, and wait triggers next time.
After the BIAS of shutdown switch power supply, when the voltage that the UVLO (UnderVoltageLockOut, under-voltage locking) of Switching Power Supply holds is high level, thus reset to BIAS, Switching Power Supply enters normal operating conditions.
It should be noted that the time span of above-mentioned first preset time period can be arranged according to actual needs, be not further qualified at this.Be understandable that, in the present embodiment, adopt rest-set flip-flop, also can adopt other trigger in other embodiments; The reset terminal of this rest-set flip-flop is R end, and set end is S end, and positive output end is Q end, and negative output terminal is Q end.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a Switching Power Supply overload protection arrangement, is characterized in that, described Switching Power Supply overload protection arrangement comprises acquisition module, judge module and control module; Wherein,
Acquisition module, for obtaining the error current feedback voltage level of Switching Power Supply;
Judge module, for judging the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply; If then within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of described Switching Power Supply, return the error current feedback voltage Value Operations being performed described acquisition Switching Power Supply by acquisition module; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of described Switching Power Supply, then quit work by control module control switch power supply, otherwise perform the error current feedback voltage Value Operations of described acquisition Switching Power Supply by acquisition module.
2. Switching Power Supply overload protection arrangement as claimed in claim 1, is characterized in that, described judge module also for, judge the 3rd Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the greatest limit power of described Switching Power Supply; If so, then quit work by described control module control switch power supply; Otherwise continue to judge the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply.
3. Switching Power Supply overload protection arrangement as claimed in claim 2, it is characterized in that, described judge module comprises the first comparator, the second comparator and the 3rd comparator, and the error current feedback signal of described Switching Power Supply is connected to the in-phase input end of the first comparator, the reverse input end of the second comparator and the input in the same way of the 3rd comparator respectively; The reverse input end of the first comparator connects the level signal that a magnitude of voltage equals the first Error Feedback magnitude of voltage, the input in the same way of the second comparator connects the level signal that a magnitude of voltage equals the second Error Feedback magnitude of voltage, and the reverse input end of the 3rd comparator connects the level signal that a magnitude of voltage equals the 3rd Error Feedback magnitude of voltage.
4. Switching Power Supply overload protection arrangement as claimed in claim 3, it is characterized in that, described control module comprises the first rest-set flip-flop, timer or logical circuit and the second rest-set flip-flop, wherein the set end of the first rest-set flip-flop is connected with the output of the first comparator, and the reset terminal of the second rest-set flip-flop is connected with the under-voltage locking end of Switching Power Supply; The start end of timer is connected with the positive output end of the first rest-set flip-flop, and reset terminal is connected with the negative output terminal of the first rest-set flip-flop; Or the first input end of logical circuit is connected with the output of timer, the second input is connected with the output of the 3rd comparator, and output is connected with the set end of the second rest-set flip-flop; The positive output end of described second rest-set flip-flop is held with the BIAS of Switching Power Supply and is connected.
5. a Switching Power Supply overload protection method, is characterized in that, comprises the following steps:
Obtain the error current feedback voltage level of Switching Power Supply;
Judge the first Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply;
If so, then within the first preset time period, during the second Error Feedback magnitude of voltage when error current feedback voltage level is less than the maximum average power of described Switching Power Supply, the error current feedback voltage level step performing described acquisition Switching Power Supply is returned; If error current feedback voltage level is all more than or equal to the second Error Feedback magnitude of voltage during the maximum average power of described Switching Power Supply, then control switch power supply quits work;
If not, then the step of the error current feedback voltage level performing described acquisition Switching Power Supply is returned.
6. Switching Power Supply overload protection method as claimed in claim 5, is characterized in that, perform described judge whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply time the first Error Feedback magnitude of voltage step before also comprise:
Judge the 3rd Error Feedback magnitude of voltage when whether error current feedback voltage level is greater than the greatest limit power of described Switching Power Supply;
If so, then control switch power supply quits work;
If not, then described the first Error Feedback magnitude of voltage step when judging whether error current feedback voltage level is greater than the maximum peak power of described Switching Power Supply is performed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210470223.5A CN102983553B (en) | 2012-11-19 | 2012-11-19 | Switching Power Supply overload protection method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210470223.5A CN102983553B (en) | 2012-11-19 | 2012-11-19 | Switching Power Supply overload protection method and device |
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Citations (4)
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| CN2777817Y (en) * | 2005-01-26 | 2006-05-03 | 杨义根 | Protection circuit for single switch power |
| CN101167240A (en) * | 2004-08-06 | 2008-04-23 | St微电子公司 | Switched-mode power supply regulation |
| CN102193509A (en) * | 2010-03-01 | 2011-09-21 | 株式会社村田制作所 | Switching control circuit and switching power supply device |
| CN102364858A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5573454B2 (en) * | 2009-11-26 | 2014-08-20 | 富士電機株式会社 | Power factor improved switching power supply |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101167240A (en) * | 2004-08-06 | 2008-04-23 | St微电子公司 | Switched-mode power supply regulation |
| CN2777817Y (en) * | 2005-01-26 | 2006-05-03 | 杨义根 | Protection circuit for single switch power |
| CN102193509A (en) * | 2010-03-01 | 2011-09-21 | 株式会社村田制作所 | Switching control circuit and switching power supply device |
| CN102364858A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
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