CN203674972U - Overvoltage and overcurrent protection circuit - Google Patents
Overvoltage and overcurrent protection circuit Download PDFInfo
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- CN203674972U CN203674972U CN201320855190.6U CN201320855190U CN203674972U CN 203674972 U CN203674972 U CN 203674972U CN 201320855190 U CN201320855190 U CN 201320855190U CN 203674972 U CN203674972 U CN 203674972U
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Abstract
The utility model discloses an overvoltage and overcurrent protection circuit. The overvoltage and overcurrent protection circuit is coupled with an external power supply and an external circuit and comprise an overvoltage protection unit and an overcurrent protection unit. The overcurrent protection unit is coupled with the external power supply, the external circuit, and the overvoltage protection unit. When overcurrent is supplied by the external power supply, the overcurrent protection unit is used for limiting the overcurrent in a manner of increasing the impedance of the overcurrent protection unit itself, limiting current outputted to the external circuit within a preset safe value, and transmitting supply voltage of the external power supply to the overvoltage protection unit. When the supply voltage, transmitted from the overcurrent protection unit, of the external power supply is overvoltage, the overvoltage protection unit is used for clamping the supply voltage in a manner of decreasing the impedance of the overvoltage protection unit itself, and clamping voltage outputted to the external circuit within a preset safe value. The overvoltage and overcurrent protection circuit resolves a problem of overvoltage and overcurrent protection of a switching power supply.
Description
Technical field
The utility model relates to electronic circuit field, specifically, relates to a kind of over-voltage over-current protection circuit.
Background technology
At present, along with developing rapidly of semiconductor technology, the use of integrated circuit has spread all over every field, especially for switching circuit (as: the DC-DC circuit of power supply control class, miniaturization switching power circuit), be widely used in the fields such as power electronics, military project, scientific research, industrial control equipment, communication apparatus, instrument and meter, switching equipment, access device, mobile communication, router communication, Industry Control, automotive electronics, Aero-Space.Have short, the feature such as reliability is high, system upgrade is easy of design cycle owing to adopting switching circuit to set up power-supply system, the application of switching circuit is more and more extensive.Along with a large amount of uses of semiconductor technology, encapsulation technology and high-frequency soft switch; the power density of switching circuit is increasing; conversion efficiency is more and more higher; apply also more and more simpler; current popular use semiconductor circuit completes overvoltage detection and over-current detection; with semiconductor electronic switch cut-out input circuit, reach the object of protection late-class circuit.
The large-scale corresponding industrial automation equipment of industrial production managerial demand is carried out, and the power switch circuits such as switching circuit are also widely used in industrial automation equipment.But, being applied in severe industrial environment at industrial automation equipment, voltage on power cable conventionally exists and rises sharply or the phenomenon of rapid drawdown, the overvoltage causing thus and under-voltagely all may cause damage to switching circuit.Wherein, the access high pressure of power cable possible errors in wiring process, or due to heavy load access or disconnect causing on power circuit and produce high surge voltage, cause overvoltage to damage to power circuit.Especially go up and can cause damage to the device of whole piece circuit carrying out wrong line, cause certain economic loss.This
In prior art, semiconductor circuit, in the situation that having surge voltage, easily damages, and components and parts usage quantity is many, complex structure, so just reduced the efficiency of power supply, and invalid power consumption increases the burden of chip cooling, affected the stability of circuit, simultaneously, because components and parts usage quantity in circuit is more, the probability breaking down is higher, has reduced the reliability of circuit entirety.
Therefore, how to solve the problem for the over-voltage over-current protection of switching power circuit, just become technical problem urgently to be resolved hurrily.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of over-voltage over-current protection circuit, to solve the problem for the over-voltage over-current protection of switching power circuit.
For solving the problems of the technologies described above, the utility model provides a kind of over-voltage over-current protection circuit, couples mutually with external power source and external circuit, it is characterized in that, comprising: Overvoltage protecting unit and over-current protecting unit, wherein,
Described over-current protecting unit, couple mutually with described external power source, external circuit and described Overvoltage protecting unit, for in the time of the power supply overcurrent of described external power source, to increase the mode of this over-current protecting unit direct impedance, supply current is carried out to current limliting processing, the described current limit that exports described external circuit to, in preset safety value, is sent to described Overvoltage protecting unit by the supply power voltage of described external power source simultaneously;
Described Overvoltage protecting unit; couple mutually with described over-current protecting unit and described external circuit; while being used for the supply power voltage overvoltage of the described external power source transmitting at described over-current protecting unit; to reduce the mode of this Overvoltage protecting unit direct impedance; supply power voltage is carried out to clamper processing, by the voltage clamp that exports described external circuit in preset safety value.
Preferably, described preset safety value, further for the normal operation of device in circuit and lower than the curtage value that causes device failure in circuit.
Preferably, described over-current protecting unit, is further coupled between described external power source and external circuit with series system.
Preferably, described Overvoltage protecting unit, is further coupled between described external power source and external circuit with parallel way.
Preferably, described over-current protecting unit, further for having the resettable fuse of current limliting.
Preferably, described Overvoltage protecting unit, further for having the diode of clamper.
Compared with prior art, a kind of over-voltage over-current protection circuit described in the utility model, has reached following effect:
1) the utility model is by the Real-Time Monitoring to voltage and current in circuit; can know in time rising sharply of voltage or electric current; and in the time of overtension, voltage is carried out clamper or in the time that electric current is too high, electric current carried out to current limliting; make it be no more than ceiling voltage or electric current that circuit can bear, thereby efficiently solve the problem for the over-voltage over-current protection of switching power circuit.
2) it is less that the utility model uses device, simple structure, and reliability is high, in effectively carrying out over-current over-voltage protection, has also reduced manufacturing cost.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a part of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structured flowchart of the over-voltage over-current protection circuit described in the utility model embodiment mono-.
Fig. 2 is the structured flowchart of over-voltage over-current protection circuit of the prior art.
Fig. 3 is the structured flowchart of the over-voltage over-current protection circuit described in the utility model embodiment bis-.
Fig. 4 is the concrete application circuit of the over-voltage over-current protection circuit described in the utility model embodiment bis-.
Embodiment
Censure specific components as used some vocabulary in the middle of specification and claim.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims are not used as distinguishing the mode of assembly with the difference of title, but the difference in function is used as the criterion of distinguishing with assembly.If " comprising " mentioned in the middle of specification and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in acceptable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition, " couple " word and comprise directly any and electric property coupling means indirectly at this.Therefore, be coupled to one second device if describe a first device in literary composition, represent that described first device can directly be electrically coupled to described the second device, or be indirectly electrically coupled to described the second device by other devices or the means that couple.Specification subsequent descriptions is for implementing preferred embodiments of the present utility model, and right described description is to illustrate that rule of the present utility model is object, not in order to limit scope of the present utility model.Protection range of the present utility model is when being as the criterion depending on the claims person of defining.
Below in conjunction with accompanying drawing, the utility model is described in further detail, but not as to restriction of the present utility model.
Embodiment mono-
As shown in Figure 1, be a kind of over-voltage over-current protection circuit described in the utility model embodiment mono-, couple mutually with external power source and external circuit, this over-voltage over-current protection circuit 11 comprises: over-current protecting unit 101 and Overvoltage protecting unit 102, wherein,
Described over-current protecting unit 101, couple mutually with described external power source, external circuit and described Overvoltage protecting unit 102, for in the time of the power supply overcurrent of described external power source, to increase the mode of this over-current protecting unit direct impedance, supply current is carried out to current limliting processing, the described current limit that exports described external circuit to, in preset safety value, is sent to the supply power voltage of described external power source to described Overvoltage protecting unit 102 simultaneously;
Described Overvoltage protecting unit 102, couple mutually with described over-current protecting unit 101 and described external circuit, while being used for the supply power voltage overvoltage of the described external power source transmitting at described over-current protecting unit 101, to reduce the mode of this Overvoltage protecting unit direct impedance, supply power voltage is carried out to clamper processing, by the voltage clamp that exports described external circuit in preset safety value;
Wherein, described preset safety value, is specially in circuit the normal operation of device and lower than the curtage value that causes device failure in circuit.
Above-mentioned over-current protecting unit 101 is coupled between described external power source and external circuit with series system.
Above-mentioned Overvoltage protecting unit 102 is coupled between described external power source and external circuit with parallel way.
In the present embodiment, described over-current protecting unit 101, for having the resettable fuse of current limliting; Described Overvoltage protecting unit 102, for having the diode of clamper.
In the present embodiment; described over-voltage over-current protection circuit; be specifically as follows the corresponding circuit structure being formed by the circuit elements device with current limliting and clamper function; certainly; it will be appreciated by those skilled in the art that; described over-voltage over-current protection circuit can also, for having integrated chip or the device of foregoing circuit function, not form restriction of the present utility model at this.
In the present embodiment, described over-voltage over-current protection circuit specifically can be made up of current-limiting resistance.
Embodiment bis-
Now, in conjunction with Fig. 2 to 4, the concrete application of the described device that is applied to the under-voltage overvoltage protection in circuit is described:
As shown in Figure 2, in the prior art, although the control of by switch power controller part, whole circuit being turn-offed or being opened in circuit,, the overvoltage of external circuit or overcurrent, can cause the malfunctioning of switch power controller even to damage.Therefore, in circuit structure, add error connection proof high voltage protection circuit, as shown in Figure 3.
In practical application, the corresponding side circuit of the circuit block diagram shown in Fig. 3 as shown in Figure 4, is described over-voltage over-current protection circuit corresponding side circuit in concrete application, wherein,
F1 is the resettable fuse with metering function, TVS1(TVS-Transient Voltage Suppressor-Transient Suppression Diode, and feature is: response speed is fast especially; Resistance to surge impact ability is poor compared with discharge tube and piezo-resistance, and its 10/1000 μ s wave impulse power is from 400W～30KW, and pulse peak current is from 0.52A～544A; Breakdown potential is pressed with the series of values from 6.8V～550V, and the circuit of being convenient to various different voltages uses) for thering is the Transient Suppression Diode of clamping action.
Overcurrent protection structure is made up of F1, and overvoltage protection structure is made up of TVS1.
Particularly:
For the situation of power supply overcurrent, electric current can raise gradually from lower current value, and while flowing through F1, it is large that the resistance value of F1 becomes rapidly, thus by current limit a safe range.If thereby protect suffix circuit in the time of the electric current of the minimum movements value by being less than F1 (minimum value is 20mA), present low resistance.TVS1 exceed its reverse shutoff voltage (minimum 64V) thus time TVS1 impedance sharply diminish the voltage clamping at its two ends, thereby protected late-class circuit.
For the situation of power supply overvoltage; voltage can raise gradually from lower magnitude of voltage; in the time of external-connected port high pressure, TVS1 is in the time exceeding its reverse shutoff voltage (minimum 64V), and TVS1 moves; the rapid step-down of impedance of TVS1; drop to from original impedance in the scope of a safety, thereby by the voltage clamping at its two ends, protected suffix circuit; meanwhile, the existence of TVS1 provides the function of surge protection.In the present embodiment, can adjust by the value of change F1 the threshold value of overcurrent protection, can adjust the threshold value of overvoltage protection by adjusting TVS1, wherein, the minimum value of overcurrent protection can be low to moderate 20mA, and overvoltage protection is not less than 64V.
Compared with prior art, a kind of over-voltage over-current protection circuit described in the utility model, has reached following effect:
1) the utility model is by the Real-Time Monitoring to voltage and current in circuit; can know in time rising sharply of voltage or electric current; and in the time of overtension, voltage is carried out clamper or in the time that electric current is too high, electric current carried out to current limliting; make it be no more than ceiling voltage or electric current that circuit can bear, thereby efficiently solve the problem for the over-voltage over-current protection of switching power circuit.
2) it is less that the utility model uses device, simple structure, and reliability is high, in effectively carrying out over-current over-voltage protection, has also reduced manufacturing cost.
Above-mentioned explanation illustrates and has described some preferred embodiments of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in utility model contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not depart from spirit and scope of the present utility model, all should be in the protection range of the utility model claims.
Claims (6)
1. an over-voltage over-current protection circuit, couples mutually with external power source and external circuit, it is characterized in that, comprising: Overvoltage protecting unit and over-current protecting unit, wherein,
Described over-current protecting unit, couple mutually with described external power source, external circuit and described Overvoltage protecting unit, for in the time of the power supply overcurrent of described external power source, to increase the mode of this over-current protecting unit direct impedance, supply current is carried out to current limliting processing, the described current limit that exports described external circuit to, in preset safety value, is sent to described Overvoltage protecting unit by the supply power voltage of described external power source simultaneously;
Described Overvoltage protecting unit; couple mutually with described over-current protecting unit and described external circuit; while being used for the supply power voltage overvoltage of the described external power source transmitting at described over-current protecting unit; to reduce the mode of this Overvoltage protecting unit direct impedance; supply power voltage is carried out to clamper processing, by the voltage clamp that exports described external circuit in preset safety value.
2. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described preset safety value, further for the normal operation of device in circuit and lower than the curtage value that causes device failure in circuit.
3. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described over-current protecting unit is further coupled between described external power source and external circuit with series system.
4. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described Overvoltage protecting unit is further coupled between described external power source and external circuit with parallel way.
5. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described over-current protecting unit, further for having the resettable fuse of current limliting.
6. over-voltage over-current protection circuit as claimed in claim 1, is characterized in that, described Overvoltage protecting unit, further for having the diode of clamper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320855190.6U CN203674972U (en) | 2013-12-23 | 2013-12-23 | Overvoltage and overcurrent protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320855190.6U CN203674972U (en) | 2013-12-23 | 2013-12-23 | Overvoltage and overcurrent protection circuit |
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| CN203674972U true CN203674972U (en) | 2014-06-25 |
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| CN201320855190.6U Expired - Lifetime CN203674972U (en) | 2013-12-23 | 2013-12-23 | Overvoltage and overcurrent protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683884A (en) * | 2013-12-23 | 2014-03-26 | 北京易艾斯德科技有限公司 | Over-voltage and over-current protection circuit |
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- 2013-12-23 CN CN201320855190.6U patent/CN203674972U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683884A (en) * | 2013-12-23 | 2014-03-26 | 北京易艾斯德科技有限公司 | Over-voltage and over-current protection circuit |
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Granted publication date: 20140625 |