CN103915823A - Over-current protection circuit and power supplier comprising same - Google Patents
Over-current protection circuit and power supplier comprising same Download PDFInfo
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- CN103915823A CN103915823A CN201310005005.9A CN201310005005A CN103915823A CN 103915823 A CN103915823 A CN 103915823A CN 201310005005 A CN201310005005 A CN 201310005005A CN 103915823 A CN103915823 A CN 103915823A
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Abstract
The embodiment of the invention provides an over-current protection circuit and a power supplier comprising the same. The over-current protection circuit comprises a converter, a proportion resistor element, and an auxiliary switch element. The converter is coupled with a current transmission route of a main switch element and correspondingly generates sub currents according to main currents of the current transmission route. The proportion resistor element is electrically connected with the converter and generates first voltage signals according to the sub currents. The auxiliary switch element is electrically connected with the proportion resistor element and is controlled by the first voltage signals to selectively control on or off of the main switch element. Accordingly, the main switch element can be quickly turned off to avoid damages of the main switch element.
Description
Technical field
The present invention is about a kind of circuit overcurrent protection and power supply unit thereof, particularly about a kind of circuit overcurrent protection and power supply unit thereof that is applied to power switch component.
Background technology
Traditionally, in power supply unit, conventionally can there is some power switch components, by power ratio control switch element, thus the electric power of out-put supply supply optionally.Refer to Fig. 1, Fig. 1 illustrates traditional power supply unit schematic diagram.As shown in Figure 1, the power supply unit 9 of bridge-type framework may have 4 power switch component SW1, SW2, SW3, SW4.Power supply unit 9 can switched conductive power switch component SW1 and SW4, or conducting power switch component SW2 and SW3, to supply the load R of electric power to rear end.
But, in the time that misoperation produces, for example, with power switch component (power switch component SW1 and SW2, or power switch component SW3 and the SW4) conducting simultaneously of arm.Now, the resistance value between voltage source vin and earth terminal is minimum, the electric current fast rise of each power switch component that inevitably can make to flow through.Not only power switch component can be damaged because of overvoltage, overcurrent or overpower, and the load R on circuit or other elements also can the damages in the lump because of uncontrollable path.
Accordingly, industry needs a kind of circuit overcurrent protection and power supply unit thereof, can solve the damage phenomenon that power switch component causes because of overcurrent, reduces product and returns factory's maintenance rate.
Summary of the invention
In view of this, the invention reside in and propose a kind of circuit overcurrent protection, can sample the electric current of the power switch component of flowing through, and directly abnormal current conversion be become to voltage signal, quick closedown power switch component is to avoid the damage of power switch component.
The embodiment of the present invention provides a kind of circuit overcurrent protection, and described circuit overcurrent protection comprises current transformer, proportion resistor element and auxiliary switch element.The current delivery path of current transformer coupling main switch element, according to the principal current in current delivery path, corresponding generation from electric current.Proportion resistor element is electrically connected at current transformer, according to producing the first voltage signal from electric current.Auxiliary switch element is electrically connected proportion resistor element, is controlled by the first voltage signal, optionally to control main switch element conducting or cut-off.
In the present invention's one example embodiment, main switch element and auxiliary switch element are power electric crystal, and the control end of auxiliary switch element is electrically connected proportion resistor element, the drain electrode end of auxiliary switch element is electrically connected the control end of main switch element, and the source terminal of auxiliary switch element is electrically connected the source terminal of main switch element.In addition, in the time that the first voltage signal exceedes the first threshold value, auxiliary switch element conducting, and the control end of main switch element is electrically connected the source terminal of main switch element through auxiliary switch element.
The invention reside in and propose a kind of power supply unit with circuit overcurrent protection; described circuit overcurrent protection can sample the electric current of the power switch component of flowing through; and directly abnormal current conversion being become to voltage signal, quick closedown power switch component is to avoid the damage of power switch component and power supply unit.
The embodiment of the present invention provides a kind of power supply unit, comprises at least one main switch element and circuit overcurrent protection, and described circuit overcurrent protection comprises current transformer, proportion resistor element and auxiliary switch element.The current delivery path of current transformer coupling main switch element, according to the principal current in current delivery path, corresponding generation from electric current.Proportion resistor element is electrically connected at current transformer, according to producing the first voltage signal from electric current.Auxiliary switch element is electrically connected proportion resistor element, is controlled by the first voltage signal, optionally to control main switch element conducting or cut-off.
In sum; the circuit overcurrent protection that the embodiment of the present invention provides and power supply unit thereof; there is simple circuit design and instant response speed; and can be by the flow through electric current of power switch component of sampling; and directly abnormal current conversion is become to voltage signal, thereby can utilize described voltage signal quick closedown power switch component to avoid the damage of power switch component.
For enabling further to understand feature of the present invention and technology contents, refer to following about detailed description of the present invention and accompanying drawing, but these explanations and appended graphic the present invention that are only used for illustrating but not are done any restriction to interest field of the present invention.
Accompanying drawing explanation
Fig. 1 illustrates traditional power supply unit schematic diagram.
Fig. 2 illustrates the functional block diagram according to the circuit overcurrent protection of the present invention's one example embodiment.
Fig. 3 illustrates the functional block diagram according to the power supply unit of the present invention's one example embodiment.
[main element symbol description]
1: circuit overcurrent protection
10: current transformer
12: proportion resistor element
14: auxiliary switch element
16: the first diodes
18: the first auxiliary resistances
20: the second diodes
22: the second auxiliary resistances
3: power supply unit
9: power supply unit
Q1: main switch element
R1: resistance
A: outside feed side
SW1～SW4: power switch component
R: load
Vin: voltage source
Embodiment
Refer to Fig. 2, Fig. 2 illustrates the functional block diagram according to the circuit overcurrent protection of the present invention's one example embodiment.Whether as shown in Figure 2, circuit overcurrent protection 1 is in order to the detecting electric current of main switch element Q1 of flowing through, and utilize described in simple circuit judges electric current abnormal, the conducting or the cut-off that produce according to this corresponding feedback signal control main switch element Q1.At this, circuit overcurrent protection 1 at least comprises current transformer (current transformer) 10, proportion resistor element 12 and auxiliary switch element 14.In an example, between proportion resistor element 12 and auxiliary switch element 14, more can be electrically connected with the first diode 16 and the first auxiliary resistance 18.In addition,, between main switch element Q1 and auxiliary switch element 14, more can be electrically connected with the second diode 20 and the second auxiliary resistance 22.
The be coupled current delivery path of main switch element Q1 of current transformer 10, according to the principal current in current delivery path, corresponding generation from electric current.In practice, main switch element Q1 and auxiliary switch element 14 can be power switch, power electric crystal.Person of ordinary skill in the field should understand, the current delivery path of main switch element Q1 refers to drain electrode end (drain) received current by main switch element Q1, then by the circuit of source terminal (source) output current.In the example of Fig. 2, current transformer 10 can be arranged on the circuit being connected with the source terminal of main switch element Q1.Certainly, the present invention does not limit the setting position of current transformer 10, and for instance, current transformer 10 also can be arranged on the circuit being connected with the drain electrode end of main switch element Q1.By this, current transformer 10 can be coupled out the principal current of the main switch element Q1 that flows through with a special ratios, and produces one accordingly from electric current, and described special ratios can be by person of ordinary skill in the field's designed, designed.
Proportion resistor element 12 is electrically connected at current transformer 10, and for example proportion resistor element 12 can parallel converters 10.In practice, proportion resistor element 12 can be a passive device that has fixed resistance value, thereby exports from the current value of electric current and the relation of described resistance value according to current transformer 10, and proportion resistor element 12 can produce the first voltage signal accordingly.
Described the first voltage signal is as the control end voltage of auxiliary switch element 14.Accordingly, auxiliary switch element 14 is electrically connected this proportion resistor element 12, is controlled by the first voltage signal optionally to control main switch element Q1 conducting or cut-off.In practice, in the time that the first voltage signal exceedes the first threshold value, auxiliary switch element 14 can be controlled and conducting.The critical voltage (threshold voltage) that described the first voltage signal can be auxiliary switch element 14, and when auxiliary switch element 14 conducting, the voltage difference of the control end of main switch element Q1 and source terminal can be dragged down, thus cut-off main switch element Q1.Accordingly; the circuit overcurrent protection 1 that the present embodiment proposes has the extremely short reaction time; as long as auxiliary switch element 14, will be closed immediately main switch element Q1, thereby reduce the possibility that main switch element Q1 damages because electric current is excessive when conducting because the principal current of main switch element Q1 is abnormal.
Please continue referring to Fig. 2, the first diode 16 and the first auxiliary resistance 18 for example, design in order to prevent the abnormal action of auxiliary switch element 14 (avoiding adverse current).Person of ordinary skill in the field should understand, under suitable circuit design, and the first diode 16 and not necessarily necessary element of the first auxiliary resistance 18.Same, the second diode 20 and the second auxiliary resistance 22 are also to design in order to prevent adverse current.Under suitable circuit design, also necessary element not necessarily of the second diode 20 and the second auxiliary resistance 22.
From the angle of practical operation, main switch element Q1 is generally the signal that is controlled by the feed-in of outside feed side A institute, and outside feed side A can be considered haply through resistance R 1 and connects the control end of main switch element Q1.When in the situation of auxiliary switch element 14 in cut-off, main switch element Q1 is by the signal controlling of outside feed side A institute feed-in.Note that current transformer 10 should be the principal current of main switch element Q1 of flowing through that can be coupled at any time, use output from electric current.Only when electric current is in normal range (NR), corresponding first voltage signals that produce of proportion resistor element 12 can not exceed the first threshold value (being no more than the critical voltage of auxiliary switch element 14), and therefore auxiliary switch element 14 is ended.
Contrary, if when the principal current of the main switch element Q1 that flows through increases suddenly extremely, proportion resistor element 12 produces the first voltage signal will synchronously exceed the first threshold value, makes the instant conducting of auxiliary switch element 14.As can be seen from Figure 2, when auxiliary switch element 14 conducting, control end, the second diode 20, the second auxiliary resistance 22 and the auxiliary switch element 14 of main switch element Q1 can form the current path of a conducting, and the control end of main switch element Q1 and source terminal have very close voltage haply.By this, in the case of the critical voltage that the control end of main switch element Q1 and the voltage difference of source terminal are less than, can end fast main switch element Q1.
It should be noted that the described main switch element Q1 of the present embodiment is not limited with N-shaped power electric crystal.For instance, the replaceable one-tenth p-type of the N-shaped power electric crystal power electric crystal that the present embodiment illustrates, change circuit connecting relation that should be able to be suitable in person of ordinary skill in the field, replaces to other and has the circuit of identical functions with the circuit that the present embodiment is illustrated.
In order more to clearly demonstrate application mode of the present invention, please also refer to Fig. 2 and Fig. 3, Fig. 3 illustrates the functional block diagram according to the power supply unit of the present invention's one example embodiment.As shown in the figure, power supply unit 3 has the circuit overcurrent protection 1 that multiple power switch component SW1～SW4 and Fig. 2 illustrate.The present embodiment selects one of them switch element SW4 to be considered as the main switch element in last embodiment, and circuit overcurrent protection 1 is coupled on the current delivery path of switch element SW4.The ground connection symbol that Fig. 3 illustrates is not in order to limit the necessary ground connection of source terminal of auxiliary switch element 14, as long as after auxiliary switch element 14 conductings, directly control switch element SW4 cut-off, all should belong to the disclosed content of the present embodiment.Accordingly, the source terminal of the auxiliary switch element 14 that Fig. 3 illustrates not only can ground connection, also can replace and be connected to the contact with specific voltage position standard.
Described in last embodiment, whether circuit overcurrent protection 1 is abnormal in order to the flow through electric current (principal current) of power switch component SW4 of detecting, and can end fast the power switch component SW4 that bears super-high-current.In general, it is extremely the misoperation that noise causes mostly that the electric current of power switch component SW4 of flowing through occurs, power switch component SW3, the SW4 of same arm are switched on simultaneously, and moment makes the resistance value between voltage source vin and earth terminal level off to zero, causes the excessive situation of electric current.For example, if the load R on circuit (other electronic installations) does not have circuit overcurrent protection or other protection circuits, in the time that misoperation occurs, probably all sustain damages of power switch component SW3, SW4 and load R.At this, the circuit overcurrent protection 1 that the circuit overcurrent protection 1 of the present embodiment illustrates with Fig. 2 is identical, and the present embodiment does not repeat them here.
In sum; the circuit overcurrent protection that the embodiment of the present invention provides and power supply unit thereof; there is simple circuit design and instant response speed; and can be by the flow through electric current of power switch component of sampling; and directly abnormal current conversion is become to voltage signal, thereby can utilize described voltage signal quick closedown power switch component to avoid the damage of power switch component.
By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and not with above-mentioned disclosed preferred embodiment, category of the present invention is limited.On the contrary, its objective is that hope can contain in the category of the scope of the claims of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (10)
1. a circuit overcurrent protection, is characterized in that, comprising:
One current transformer, a current delivery path of coupling one main switch element, according to the principal current in this current delivery path, corresponding generation one is from electric current;
One proportion resistor element, is electrically connected at this current transformer, according to producing one first voltage signal from electric current; And
One auxiliary switch element, is electrically connected this proportion resistor element, is controlled by this first voltage signal, optionally to control this main switch element conducting or cut-off.
2. circuit overcurrent protection as claimed in claim 1; it is characterized in that; this main switch element and this auxiliary switch element are power electric crystal; and the control end of this auxiliary switch element is electrically connected this proportion resistor element; the drain electrode end of this auxiliary switch element is electrically connected the control end of this main switch element, and the source terminal of this auxiliary switch element is electrically connected the source terminal of this main switch element.
3. circuit overcurrent protection as claimed in claim 2; it is characterized in that; in the time that this first voltage signal exceedes first threshold value, this auxiliary switch element conducting, and the control end of this main switch element is electrically connected the source terminal of this main switch element through this auxiliary switch element.
4. circuit overcurrent protection as claimed in claim 2; it is characterized in that; the first end of this current transformer is electrically connected the first end of this proportion resistor element and the control end of this auxiliary switch element, and the source terminal of the second end of this current transformer, the second end of this proportion resistor element and this auxiliary switch element is electrically connected the source terminal of this main switch element.
5. circuit overcurrent protection as claimed in claim 4; it is characterized in that; more comprise one first diode, the anode tap of this first diode is electrically connected the first end of this proportion resistor element, and the cathode terminal of this first diode is electrically connected the control end of this auxiliary switch element.
6. circuit overcurrent protection as claimed in claim 5; it is characterized in that; more comprise one second diode, the anode tap of this second diode is electrically connected the control end of this main switch element, and the cathode terminal of this second diode is electrically connected the drain electrode end of this auxiliary switch element.
7. circuit overcurrent protection as claimed in claim 6; it is characterized in that; more comprise one first auxiliary resistance and one second auxiliary resistance; this first auxiliary resistance is electrically connected between the cathode terminal of this first diode and the control end of this auxiliary switch element, and this second auxiliary resistance is electrically connected between the cathode terminal of this second diode and the drain electrode end of this auxiliary switch element.
8. a power supply unit, is characterized in that, comprising:
At least one main switch element; And
One circuit overcurrent protection, comprising:
One current transformer, a current delivery path of this main switch element that is coupled, according to the principal current in this current delivery path, corresponding generation one is from electric current;
One proportion resistor element, is electrically connected at this current transformer, according to producing one first voltage signal from electric current; And
One auxiliary switch element, is electrically connected this proportion resistor element, is controlled by this first voltage signal, optionally to control this main switch element conducting or cut-off.
9. power supply unit as claimed in claim 8, it is characterized in that, this main switch element and this auxiliary switch element are power electric crystal, and the control end of this auxiliary switch element is electrically connected this proportion resistor element, the drain electrode end of this auxiliary switch element is electrically connected the control end of this main switch element, and the source terminal of this auxiliary switch element is electrically connected the source terminal of this main switch element.
10. power supply unit as claimed in claim 9, it is characterized in that, in the time that this first voltage signal exceedes first threshold value, this auxiliary switch element conducting, and the control end of this main switch element is electrically connected the source terminal of this main switch element through this auxiliary switch element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310005005.9A CN103915823B (en) | 2013-01-07 | Circuit overcurrent protection and power supply unit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310005005.9A CN103915823B (en) | 2013-01-07 | Circuit overcurrent protection and power supply unit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103915823A true CN103915823A (en) | 2014-07-09 |
| CN103915823B CN103915823B (en) | 2016-11-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111670524A (en) * | 2018-02-05 | 2020-09-15 | 皮尔伯格泵技术有限责任公司 | Automatic auxiliary unit with electronic protection unit |
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|---|---|---|---|---|
| CN101409508A (en) * | 2007-10-09 | 2009-04-15 | 三菱电机株式会社 | Power circuit and leakage breaker using the same |
| CN101599632A (en) * | 2008-03-12 | 2009-12-09 | 凹凸电子（武汉）有限公司 | Regulate the supervisory circuit of electric current |
| CN101999205A (en) * | 2008-04-11 | 2011-03-30 | 弗莱克斯电子有限责任公司 | Active snubber for transition mode power converter |
| CN102097789A (en) * | 2010-11-24 | 2011-06-15 | 黄金亮 | Over-current or short-circuit state detection circuit of insulated gate bipolar transistor (IGBT) |
| CN102761105A (en) * | 2012-05-09 | 2012-10-31 | 刘裕国 | Overcurrent driving protection device and method for PWM control circuit |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409508A (en) * | 2007-10-09 | 2009-04-15 | 三菱电机株式会社 | Power circuit and leakage breaker using the same |
| CN101599632A (en) * | 2008-03-12 | 2009-12-09 | 凹凸电子（武汉）有限公司 | Regulate the supervisory circuit of electric current |
| CN101999205A (en) * | 2008-04-11 | 2011-03-30 | 弗莱克斯电子有限责任公司 | Active snubber for transition mode power converter |
| CN102097789A (en) * | 2010-11-24 | 2011-06-15 | 黄金亮 | Over-current or short-circuit state detection circuit of insulated gate bipolar transistor (IGBT) |
| CN102761105A (en) * | 2012-05-09 | 2012-10-31 | 刘裕国 | Overcurrent driving protection device and method for PWM control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111670524A (en) * | 2018-02-05 | 2020-09-15 | 皮尔伯格泵技术有限责任公司 | Automatic auxiliary unit with electronic protection unit |
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