CN102427216A - Automatic regulation protection detection circuit of power supply - Google Patents
Automatic regulation protection detection circuit of power supply Download PDFInfo
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- CN102427216A CN102427216A CN2011104084248A CN201110408424A CN102427216A CN 102427216 A CN102427216 A CN 102427216A CN 2011104084248 A CN2011104084248 A CN 2011104084248A CN 201110408424 A CN201110408424 A CN 201110408424A CN 102427216 A CN102427216 A CN 102427216A
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- 238000001514 detection method Methods 0.000 title claims abstract description 8
- 230000007423 decrease Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The invention relates to a protection detection circuit of a power supply. A first impedance unit is coupled with an output end of the power supply and generates an output voltage according to a load current of the power supply; a second impedance unit coupled to the output end of the power supply and generating a reference voltage; a comparison unit coupled to the first impedance unit and the second impedance unit for comparing the output voltage with the reference voltage to generate a protection signal to cut off the power supply; an adjusting unit is coupled to the second impedance unit and the comparing unit, and adjusts the magnitude of the reference voltage to control the comparing unit to output the protection signal. Therefore, the invention adjusts the size of a reference voltage through an adjusting unit, and controls a comparing unit to output a protection signal so as to achieve the purpose of protecting the product.
Description
Technical field
The present invention relates to a kind of protection circuit for detecting, it is the protection circuit for detecting that refers to a kind of power supply unit especially.
Background technology
No matter inner at computer or other electrical equipment, all be provided with the circuit of power protection usually, be used for whether the stablizing of detecting system power supply; And take place when unusual in system power supply; In time start protection mechanism, or turn off power supply, or send alerting; So that system produces when unusual at power supply, can infringement be dropped to minimum level.For the high-order electronic product, for example the mechanism of computer, power protection can not obtain scarce especially.
In the power supply unit field, the output voltage of power supply unit or the protective circuit of output stream are very important functions, and it can be avoided by power supply unit output voltage or electric current and cause the permanent damage of product improperly.The defencive function of general protective circuit comprises overvoltage (Over Voltage) protection, low-voltage (Under Voltage) protection, short-circuit protection or overload (Over Loading) protection or the like.And among the defencive function of above-mentioned protective circuit, overload protection is control accurately least easily, because it has comprised a lot of parameters, the layout type of circuit board especially influences the result of its protection especially.
Yet the guard method of the protective circuit of traditional now power supply unit is divided into primary side and detects and secondary side detection, these two kinds of detection modes.The cost of the mode that primary side detects is lower, can't reach accurate protection, and the detection mode of secondary side is precisely higher, and relative cost is also higher.But after anatomizing accuracy, the overload protection that secondary side detects has very large error also, under unregulated situation; Nearly 20% error range; The accuracy that depends on each item protection parameter, size of reference voltage, reference current, layout type, sample resistance or the like for example is so under needs accurate protection state; Produce online need be with the mode of manual work; Adjust the protection parameter, onlinely normally adjust with variable resistor and produce, the shortcoming of this practice comprises the factors such as expending man-hour and variable-resistance poor stability.
Therefore; How a kind of protection circuit for detecting of novel power supply unit is proposed to the problems referred to above; It can avoid adjusting the protection parameter to save man-hour with the mode of manual work; Need not adjust parameter,, can solve the above problems to avoid the factor of variable-resistance poor stability with variable-resistance mode.
Summary of the invention
One of the object of the invention is to provide a kind of protection circuit for detecting of power supply unit, and it adjusts the size of a reference voltage through an adjustment unit, and controls comparing unit output one protection signal, to reach the purpose of protection product.
One of the object of the invention is to provide a kind of protection circuit for detecting of power supply unit, and it adjusts the size of a reference voltage through a variable current source, and controls comparing unit output one protection signal, to reach the purpose of protection product.
One of the object of the invention is to provide a kind of protection circuit for detecting of power supply unit, and it need not use variable-resistance mode to adjust parameter, and increases the precision of protection.
Technical scheme of the present invention is: a kind of protection circuit for detecting of power supply unit, and it comprises:
One first impedance unit couples an output of this power supply unit, and produces an output voltage according to a load current of this power supply unit;
One second impedance unit couples this output of this power supply unit, and produces a reference voltage;
One comparing unit couples this first impedance unit and this second impedance unit, and relatively this output voltage and this reference voltage, and produces a protection detection signal, with by this power supply unit; And
One adjustment unit couples this second impedance unit and this comparing unit, and this adjustment unit produces a reference current and adjusts the size of this reference voltage, to control this this protection signal of comparing unit output.
Among the present invention, wherein this comparing unit is that this comparing unit then produced this protection signal when relatively this output voltage was less than this reference voltage.
Among the present invention, wherein this adjustment unit is a variable current source, controlling this second impedance unit this reference current according to the output of this variable current source, and produces this reference voltage.
Among the present invention, wherein this reference current of this variable current source is to be begun to successively decrease by maximum.
Among the present invention, wherein a resistance value of this first impedance component is a fixed value.
Among the present invention, wherein a resistance value of this second impedance component is a fixed value.
Among the present invention, wherein this comparing unit be an operational amplifier (Operation Amplifier, OPA).
Among the present invention, wherein this first impedance unit and this second impedance unit are a resistance.
The beneficial effect that the present invention has: the protection circuit for detecting of power supply unit of the present invention is to be an output that couples power supply unit by one first impedance unit, and produces an output voltage according to a load current of power supply unit; One second impedance unit is the output that couples power supply unit, and produces a reference voltage; One comparing unit is to couple first impedance unit and second impedance unit, and compares output voltage and reference voltage, and produces a protection signal, to end power supply unit; One adjustment unit couples second impedance unit and comparing unit, and the size of adjustment reference voltage, with control comparing unit output protection signal.So, the present invention adjusts the size of a reference voltage through an adjustment unit, and controls comparing unit output one protection signal, to reach the purpose of protection product.
Description of drawings
Fig. 1 is the circuit diagram of a preferred embodiment of the present invention; And
Fig. 2 is the flow chart of a preferred embodiment of the present invention.
[figure number is to as directed]
1 protection circuit for detecting, 10 first impedance units
20 second impedance units, 30 comparing units
40 adjustment units
Embodiment
For making architectural feature of the present invention and the effect reached there are further understanding and understanding, cooperate detailed explanation, be described as follows in order to preferred embodiment and accompanying drawing:
See also Fig. 1, be the circuit diagram of a preferred embodiment of the present invention.As shown in the figure; The protection circuit for detecting 1 of power supply unit of the present invention is to can be applicable to overvoltage (Over Voltage) protection, low-voltage (Under Voltage) protection detecting, short-circuit protection detecting or overload (Over Loading) protection detecting or the like; And in this embodiment; The present invention is applied to superpotential protection detecting; And protection circuit for detecting 1 of the present invention is the detection that is used for the secondary side of power supply unit is carried out voltage in present embodiment; Be that protection circuit for detecting 1 of the present invention is coupled to the output of power supply unit and protects detecting, protection circuit for detecting 1 of the present invention comprises one first impedance unit 10, one second impedance unit 20, a comparing unit 30 and an adjustment unit 40.
So, the present invention can adjust reference voltage V through adjustment unit 40
RSize, and control comparing unit 30 output protection signal OCP are to reach the purpose of protection product.
Please consult Fig. 2 in the lump, be the flow chart of the reference current of the adjustment unit of the setting of a preferred embodiment of the present invention protection circuit for detecting.As shown in the figure, the adjustment unit 40 of present embodiment is set output reference current I
RFlow process be the reference current I that first execution in step S10 sets adjustment unit 40 outputs
RMake reference voltage V
RBe 120% of the output voltage of overvoltage condition, promptly set the reference current I of adjustment unit 40 outputs earlier
R, let reference voltage V
RBe in the output voltage V that overvoltage condition is exported greater than power supply unit
SCertain multiple.So, can avoid initial setting reference current I
RAnd make reference voltage V
RBe in the output voltage V that overvoltage condition is exported less than power supply unit
S, let power supply unit be in overvoltage condition and load burnt.Afterwards, execution in step S12 compares output voltage V
SWith reference voltage V
R,, promptly setting reference current I to set guard mode
RAfter, then compare output voltage and reference voltage V
R, then execution in step S14 judges whether output protection signal OCP of comparing unit 30, promptly shown in step S16, works as output voltage V
SLess than reference voltage V
RThe time, comparing unit 30 output protection signal OCP, at this moment, because the output voltage V that power supply unit is exported
SBe the output voltage V under the overvoltage condition
SSo,, then can set reference current I if detect when protecting signal OCP this moment
RBe a threshold value, that is to say, the reference current I of this moment
RLet the second impedance unit 20 reference voltage V that produces
RDoor (shown in step S18) as the protection of the output over-voltage of power supply unit; Work as output voltage V
SGreater than reference voltage V
RThe time, and do not detect when protecting signal OCP, then represent the reference current I that sets at present
RToo high, and need downgrade this reference current I
RMake reference voltage V
REqual the output voltage V of the overvoltage condition of power supply unit output
S, to set out suitable reference current I
R, in this embodiment, be the reference current I that at every turn descends
RMake reference voltage V
RDescend 2%, and repeated execution of steps S14, up to setting out suitable reference current I
R
In sum, the protection circuit for detecting of power supply unit of the present invention is to be an output that couples power supply unit by one first impedance unit, and produces an output voltage according to a load current of power supply unit; One second impedance unit is the output that couples power supply unit, and produces a reference voltage; One comparing unit is to couple first impedance unit and second impedance unit, and compares output voltage and reference voltage, and produces a protection signal, to end power supply unit; One adjustment unit couples second impedance unit and comparing unit, and the size of adjustment reference voltage, with control comparing unit output protection signal.So, the present invention adjusts the size of a reference voltage through an adjustment unit, and controls comparing unit output one protection signal, to reach the purpose of protection product.
In sum; Be merely preferred embodiment of the present invention; Be not to be used for limiting the scope that the present invention implements, all equalizations of doing according to the described shape of claim scope of the present invention, structure, characteristic and spirit change and modify, and all should be included in the claim scope of the present invention.
Claims (8)
1. the protection circuit for detecting of a power supply unit is characterized in that it comprises:
One first impedance unit couples an output of this power supply unit, and produces an output voltage according to a load current of this power supply unit;
One second impedance unit couples this output of this power supply unit, and produces a reference voltage;
One comparing unit couples this first impedance unit and this second impedance unit, and relatively this output voltage and this reference voltage, and produces a protection detection signal, with by this power supply unit; And
One adjustment unit couples this second impedance unit and this comparing unit, and this adjustment unit produces a reference current and adjusts the size of this reference voltage, to control this this protection signal of comparing unit output.
2. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein this comparing unit is that this comparing unit then produced this protection signal when relatively this output voltage was less than this reference voltage.
3. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein this adjustment unit is a variable current source, controlling this second impedance unit this reference current according to the output of this variable current source, and produces this reference voltage.
4. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein this reference current of this variable current source is to be begun to successively decrease by maximum.
5. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein a resistance value of this first impedance component is a fixed value.
6. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein a resistance value of this second impedance component is a fixed value.
7. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein this comparing unit is an operational amplifier.
8. protection circuit for detecting as claimed in claim 1 is characterized in that, wherein this first impedance unit and this second impedance unit are a resistance.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100103237A TW201232218A (en) | 2011-01-28 | 2011-01-28 | Automatic adjusting protection and detection circuit for power supply |
| TW100103237 | 2011-01-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102427216A true CN102427216A (en) | 2012-04-25 |
Family
ID=45961166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104084248A Pending CN102427216A (en) | 2011-01-28 | 2011-12-06 | Automatic regulation protection detection circuit of power supply |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102427216A (en) |
| TW (1) | TW201232218A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219888A (en) * | 2012-05-02 | 2013-07-24 | 极创电子股份有限公司 | Automatic correction device applied to output power |
| CN103792984A (en) * | 2012-10-26 | 2014-05-14 | 伟诠电子股份有限公司 | Overcurrent protection chip of power supply and setting method thereof |
| CN104122917A (en) * | 2013-04-24 | 2014-10-29 | 立锜科技股份有限公司 | Protection device and correcting method thereof |
| CN105203832A (en) * | 2014-06-24 | 2015-12-30 | 伟诠电子股份有限公司 | Overcurrent detection chip, overcurrent adjustment circuit and overcurrent detection adjustment method |
| CN107436615A (en) * | 2016-05-26 | 2017-12-05 | 中芯国际集成电路制造(上海)有限公司 | System for detecting supply voltage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040184208A1 (en) * | 2003-03-19 | 2004-09-23 | Daniel Liu | Power protecting device for electrical power source and load |
| CN1741341A (en) * | 2004-08-03 | 2006-03-01 | 雅达电子国际有限公司 | Utilize the system and method for overtemperature protection induction of the conducting resistance of MOSFET |
| CN101082823A (en) * | 2006-05-29 | 2007-12-05 | 华硕电脑股份有限公司 | Voltage regulator circuit having overcurrent protection |
| CN101521825A (en) * | 2008-02-29 | 2009-09-02 | 瑞昱半导体股份有限公司 | Image processor and method thereof |
| CN102208802A (en) * | 2010-06-29 | 2011-10-05 | 上海山景集成电路技术有限公司 | Power switching tube overcurrent detection and overcurrent protection circuit |
-
2011
- 2011-01-28 TW TW100103237A patent/TW201232218A/en unknown
- 2011-12-06 CN CN2011104084248A patent/CN102427216A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040184208A1 (en) * | 2003-03-19 | 2004-09-23 | Daniel Liu | Power protecting device for electrical power source and load |
| CN1741341A (en) * | 2004-08-03 | 2006-03-01 | 雅达电子国际有限公司 | Utilize the system and method for overtemperature protection induction of the conducting resistance of MOSFET |
| CN101082823A (en) * | 2006-05-29 | 2007-12-05 | 华硕电脑股份有限公司 | Voltage regulator circuit having overcurrent protection |
| CN101521825A (en) * | 2008-02-29 | 2009-09-02 | 瑞昱半导体股份有限公司 | Image processor and method thereof |
| CN102208802A (en) * | 2010-06-29 | 2011-10-05 | 上海山景集成电路技术有限公司 | Power switching tube overcurrent detection and overcurrent protection circuit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219888A (en) * | 2012-05-02 | 2013-07-24 | 极创电子股份有限公司 | Automatic correction device applied to output power |
| US9270181B2 (en) | 2012-05-02 | 2016-02-23 | Infinno Technology Corp. | Automatic adjusting device for output power |
| CN103219888B (en) * | 2012-05-02 | 2016-05-11 | 极创电子股份有限公司 | Be applied to the automatic correction device of out-put supply |
| CN103792984A (en) * | 2012-10-26 | 2014-05-14 | 伟诠电子股份有限公司 | Overcurrent protection chip of power supply and setting method thereof |
| CN104122917A (en) * | 2013-04-24 | 2014-10-29 | 立锜科技股份有限公司 | Protection device and correcting method thereof |
| CN104122917B (en) * | 2013-04-24 | 2016-06-08 | 立锜科技股份有限公司 | Protector and correction method thereof |
| CN105203832A (en) * | 2014-06-24 | 2015-12-30 | 伟诠电子股份有限公司 | Overcurrent detection chip, overcurrent adjustment circuit and overcurrent detection adjustment method |
| CN107436615A (en) * | 2016-05-26 | 2017-12-05 | 中芯国际集成电路制造(上海)有限公司 | System for detecting supply voltage |
| CN107436615B (en) * | 2016-05-26 | 2019-01-22 | 中芯国际集成电路制造(上海)有限公司 | System for detecting supply voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI432938B (en) | 2014-04-01 |
| TW201232218A (en) | 2012-08-01 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20120425 |