CN104022497A - Protective circuit and electronic equipment - Google Patents
Protective circuit and electronic equipment Download PDFInfo
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- CN104022497A CN104022497A CN201410228120.7A CN201410228120A CN104022497A CN 104022497 A CN104022497 A CN 104022497A CN 201410228120 A CN201410228120 A CN 201410228120A CN 104022497 A CN104022497 A CN 104022497A
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- Prior art keywords
- discharge tube
- core inductance
- resistance
- voltage
- circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Abstract
The invention provides a protective circuit and electronic equipment and relates to the communication field, so as to reduce the circuit size and reduce the circuit cost. The circuit comprises a power supply input interface, a discharge tube, a first cored inductor and a power supply circuit, wherein the first end of the power supply input interface is connected with the first end of the discharge tube; the second end of the power supply input interface is connected with the second end of the discharge tube; the first end of the first cored inductor is connected with the first end of the discharge tube; the second end of the first cored inductor is connected with the first end of the power supply circuit; the second end of the power supply circuit is connected with the second end of the power supply input interface; when the power supply input interface receives overvoltage, the first cored inductor generates first voltage and the first voltage triggers the discharge tube to be conducted; the discharge tube releases overcurrrent generated by the overvoltage; and after the discharge tube is conducted, the first cored inductor generates second voltage according to hollow inductance, and impact of residual voltage of the discharge tube on the power supply circuit is reduced via the second voltage.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of protection circuit and electronic equipment.
Background technology
The power circuit of communication equipment can be subject to the interference of overvoltage or overcurrent conventionally, for example, can produce overvoltage or overcurrent, and in the time that overvoltage is added in the two ends of power circuit, can affect communication equipment reliability of operation when power circuit is struck by lightning.In order to ensure the normal operation of communication equipment, conventionally between power circuit and telecommunication circuit, increase protection circuit, absorb overcurrent by protection circuit, overvoltage is clamped to default magnitude of voltage simultaneously, thereby ensures the normal operation of communication equipment.
In existing protection circuit design, conventionally adopt and without continuous current discharge electricity pipe and air core inductor, power circuit is protected, be about in parallel with power circuit without continuous current discharge electricity pipe, and at power circuit and the air core inductor of connecting on circuit without between continuous current discharge electricity pipe.Like this, in the time that moment produces overvoltage, electric current sharply increases, and then makes air core inductor two ends produce high voltage, and this high voltage can trigger without the conducting of continuous current discharge electricity pipe, thereby by absorbing overcurrent without continuous current discharge electricity pipe, further, after without the conducting of continuous current discharge electricity pipe, due to higher without the residual voltage of continuous current discharge electricity pipe, now, hollow inductance can also play and reduce the impact of the residual voltage without continuous current discharge electricity pipe to power circuit.
State in realization in the design of protection circuit, adopt and without continuous current discharge electricity pipe and air core inductor, power circuit is protected, owing to there being the discharging gap of multiple series connection without continuous current discharge electricity pipe, want to allow without the conducting of continuous current discharge electricity pipe, the discharging gap of multiple series connection all must be punctured, therefore, need very high conducting voltage without continuous current discharge electricity pipe, and in order to meet the conducting voltage without continuous current discharge electricity pipe, the inductance value of air core inductor needs even tens microhenrys of ten microhenrys, thereby cause the volume of air core inductor too large, manufacturing cost is high.
Summary of the invention
Embodiments of the invention provide a kind of protection circuit and electronic equipment, and adopt discharge tube and have core inductance to realize the protection to power circuit, for reducing the volume of circuit, and the cost of reduction circuit.
First aspect, the embodiment of the present invention provides a kind of protection circuit, comprising: power input interface, discharge tube, first has core inductance and power circuit; The first end of described power input interface is connected with the first end of described discharge tube; The second end of described power input interface is connected with the second end of described discharge tube; Described first has the first end of core inductance and the first end of described discharge tube to be connected; Described first has the second end of core inductance to be connected with the first end of described power circuit; The second end of described power circuit is connected with the second end of described power input interface; Wherein, described first has the specified sensibility reciprocal of core inductance to be not less than the first default sensibility reciprocal; The described first default sensibility reciprocal is the sensibility reciprocal that ensures that described discharge tube conducting is set; Described first has core inductance, in the time that described power input interface receives overvoltage, has the specified sensibility reciprocal of core inductance to produce the first voltage according to described first, to make discharge tube conducting described in described the first voltage triggered; The conducting voltage of described discharge tube is more than or equal to the voltage of the normal work of described power circuit, is less than or equal to described overvoltage; Described discharge tube, releases for the overcurrent that described overvoltage is produced; Described first has core inductance, also for after described discharge tube conducting, has the hollow sensibility reciprocal of core inductance to produce second voltage according to described first, and reduces the residual voltage of described discharge tube to the impact of described power circuit by described second voltage.
In the possible implementation of the first of first aspect, described protection circuit also comprises: the first resistance; Wherein, the resistance of described the first resistance is not less than preset resistance value; Described preset resistance value is the value of the impact of described power circuit being set for reducing the residual voltage of described discharge tube; Described the first resistance has core inductance to connect with described first, and the first end of described the first resistance is connected with the first end of described discharge tube; The second end of described the first resistance and described first has core inductance first end to be connected.
In conjunction with first aspect, or the possible implementation of the first of first aspect, in the possible implementation of the second of first aspect, described protection circuit also comprises: protection device; The first end of described protection device and described first has the second end of core inductance to be connected; The second end of described protection device is connected with the second end of described power circuit; Described protection device, the impact for reducing the residual voltage of described discharge tube to described power circuit.
In conjunction with the possible implementation of the second of first aspect, in the third possible implementation of first aspect, described protection device comprises piezo-resistance, and/or Transient Suppression Diode; In the time that described protection device comprises described piezo-resistance, the first end of described piezo-resistance and described first has the second end of core inductance to be connected; The second end of described piezo-resistance is connected with the second end of described power circuit; In the time that described protection device comprises described Transient Suppression Diode, the first end of described Transient Suppression Diode and described first has the second end of core inductance to be connected; The second end of described Transient Suppression Diode is connected with the second end of described power circuit; In the time that described protection device comprises described piezo-resistance and described Transient Suppression Diode, the first end of described piezo-resistance and described first has the second end of core inductance to be connected; The second end of described piezo-resistance is connected with the second end of described power circuit; Described piezo-resistance and described transient voltage suppressor paralleling.
In conjunction with first aspect, or first to the 3rd any possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, described first has the saturation current of core inductance to be not less than predetermined current value; Described predetermined current value is the described first lowest high-current value that can bear while having core inductance unsaturated; Described first has the hollow sensibility reciprocal of core inductance to be not less than the second default sensibility reciprocal; The described second default sensibility reciprocal is the sensibility reciprocal of the impact of described power circuit being set for reducing the residual voltage of described discharge tube.
In conjunction with first aspect, or first to fourth any possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, described discharge tube comprises without continuous current discharge electricity pipe.
Second aspect, the embodiment of the present invention provides a kind of protection circuit, comprising: power input interface, discharge tube, second has core inductance, and the 3rd has core inductance and power circuit; Described second has the specified sensibility reciprocal and the described the 3rd of core inductance to have the specified sensibility reciprocal sum of core inductance to be not less than the first default sensibility reciprocal; The described first default sensibility reciprocal is the sensibility reciprocal that ensures that described discharge tube conducting is set; The first end of described power input interface is connected with the first end of described discharge tube; The second end of described power input interface is connected with the second end of described discharge tube; Described second has the first end of core inductance and the first end of described discharge tube to be connected; Described second has the second end of core inductance to be connected with the first end of described power circuit; The described the 3rd has the first end of core inductance and the second end of described discharge tube to be connected; The described the 3rd has the second end of core inductance and the second end of described power circuit to be connected; Described second has core inductance, in the time that described power input interface receives overvoltage, has the specified sensibility reciprocal of core inductance to produce tertiary voltage according to described second; The conducting voltage of described discharge tube is more than or equal to the voltage of the normal work of described power circuit, is less than or equal to described overvoltage; The described the 3rd has core inductance, in the time that described power input interface receives overvoltage, has the specified sensibility reciprocal of core inductance to produce the 4th voltage according to the described the 3rd, to make described tertiary voltage and described the 4th voltage sum trigger described discharge tube conducting; Described discharge tube, releases for the overcurrent that described overvoltage is produced; Described second has core inductance, also for after described discharge tube conducting, has the hollow sensibility reciprocal of core inductance to produce the 5th voltage according to described second; The described the 3rd has core inductance, also for after described discharge tube conducting, there is the hollow sensibility reciprocal of core inductance to produce the 6th voltage according to the described the 3rd, reduce the residual voltage of described discharge tube to the impact of described power circuit by described the 5th voltage and described the 6th voltage sum.
In the possible implementation of the first of second aspect, described protection circuit also comprises: the second resistance; Wherein, the resistance of described the second resistance is not less than preset resistance value; Described preset resistance value is the value of the impact of described power circuit being set for reducing the residual voltage of described discharge tube; Described second has the first end of core inductance to be connected with the first end of described discharge tube by described the second resistance; Or the described the 3rd has the first end of core inductance to be connected with the second end of described discharge tube by described the second resistance.
In conjunction with second aspect, or the possible implementation of the first of second aspect, in the possible implementation of the second of second aspect, described protection circuit also comprises: the 3rd resistance; Wherein, the resistance of described the 3rd resistance is not less than described preset resistance value; Described second has the first end of core inductance to be connected with the first end of described discharge tube by described the second resistance; The described the 3rd has the first end of core inductance to be connected with the second end of described discharge tube by described the 3rd resistance.
In conjunction with second aspect, or the possible implementation of first or the second of second aspect, in the third possible implementation of second aspect, described protection circuit also comprises: protection device; The first end of described protection device and described second has the second end of core inductance to be connected; The second end of described protection device and the described the 3rd has the second end of core inductance to be connected; Described protection device, the impact for reducing the residual voltage of described discharge tube to described power circuit.
In conjunction with second aspect, or first to the 3rd any possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, described second has the saturation current and the described the 3rd of core inductance to have the saturation current sum of core inductance to be not less than predetermined current value; Described predetermined current value is the described second lowest high-current value sum that can bear while having core inductance and the described the 3rd to have core inductance unsaturated.Described second has the hollow sensibility reciprocal and the described the 3rd of core inductance to have the hollow sensibility reciprocal sum of core inductance to be not less than the second default sensibility reciprocal; The described second default sensibility reciprocal is the sensibility reciprocal of the impact of described power circuit being set for reducing the residual voltage of described discharge tube.
The third aspect, the embodiment of the present invention provides a kind of electronic equipment, comprises the protection circuit described in load and above-described embodiment; Described protection circuit is connected with described load; Described power circuit in described protection circuit, for giving described load supplying.
The embodiment of the present invention provides a kind of protection circuit and electronic equipment, and described protection circuit comprises: power input interface, and discharge tube, first has core inductance and power circuit; In the time that power input interface receives overvoltage; first has core inductance can produce the first voltage according to specified sensibility reciprocal; this first voltage can make discharge tube conducting; the overcurrent that the overvoltage that discharge tube can receive power input interface produces is released; now because the residual voltage of discharge tube is higher; need to reduce the residual voltage of discharge tube to the impact of power circuit; first has core inductance to produce second voltage value according to hollow sensibility reciprocal; share a part of residual voltage of discharge tube; reduce the residual voltage of discharge tube to the impact of power circuit, thereby protected power circuit.Because the volume that has core inductance of identical sensibility reciprocal is less than the volume of air core inductor, first to have core inductance and discharge tube to protect power circuit and the present invention adopts, thereby reduce the volume of inductance, and then reduced the volume of circuit, and reduced the cost of circuit.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The schematic diagram of a kind of protection circuit that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 4 provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 5 a provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 5 b provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 6 provides for the embodiment of the present invention;
The schematic diagram of the another kind of protection circuit that Fig. 7 provides for the embodiment of the present invention;
The schematic diagram of a kind of electronic equipment that Fig. 8 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of protection circuit, as shown in Figure 1, comprising: power input interface 101, discharge tube 102, the first has core inductance 103 and power circuit 104.
The first end of described power input interface 101 is connected with the first end of described discharge tube 102; The second end of described power input interface 101 is connected with the second end of described discharge tube 102; Described first has the first end of core inductance 103 to be connected with the first end of described discharge tube 102; Described first has the second end of core inductance 103 to be connected with the first end of described power circuit 104; The second end of described power circuit 104 is connected with the second end of described power input interface 101.
Wherein, described first has the specified sensibility reciprocal of core inductance 103 to be not less than the first default sensibility reciprocal.The described first default sensibility reciprocal is the sensibility reciprocal that ensures that described discharge tube 102 conductings are set.
Described first has core inductance 103, in the time that described power input interface 101 receives overvoltage, has the specified sensibility reciprocal of core inductance 103 to produce the first voltage according to described first, to make discharge tube 102 conductings described in described the first voltage triggered.
Wherein, the conducting voltage of described discharge tube is more than or equal to the voltage of the normal work of described power circuit, is less than or equal to described overvoltage.
Described discharge tube 102, releases for the overcurrent that described overvoltage is produced.
Described first has core inductance 103, also for after described discharge tube 102 conductings, there is the hollow sensibility reciprocal of core inductance 103 to produce second voltage according to described first, and the impact of the residual voltage that reduces described discharge tube 102 by described second voltage to described power circuit 104.
Further, described first has the saturation current of core inductance 103 to be not less than predetermined current value.Described first has the hollow sensibility reciprocal of core inductance 103 to be not less than the second default sensibility reciprocal.
Wherein, described predetermined current value is the described first lowest high-current value that can bear while having core inductance 103 unsaturated; The described second default sensibility reciprocal is the sensibility reciprocal of the impact of described power circuit 104 being set for reducing the residual voltage of described discharge tube 102.
Concrete, power input interface 101 is in the time receiving overvoltage, because overvoltage is to produce moment, flowing through first has the electric current of core inductance 103 also to increase, when flowing through first while having the electric current of core inductance 103 to be less than predetermined current value, being first has core inductance 103 not have when saturated, first has core inductance 103 also to increase according to the first voltage that has the specified sensibility reciprocal of core inductance 103 to produce, be the first voltage, and this first voltage has reached the conducting voltage of discharge tube 102, thereby make discharge tube 102 conductings, be that discharge tube 102 is in short-circuit condition, thereby can absorb the overcurrent that overvoltage that power input interface receives produces, now, when flowing through first while having the electric current of core inductance 103 to be more than or equal to predetermined current value, be first while having core inductance 103 saturated, first has core inductance 103 to have the hollow sensibility reciprocal of core inductance 103 to produce second voltage value according to first, because the residual voltage of discharge tube 102 after conducting is higher, so this second voltage value has been shared a part of residual voltage of discharge tube 102, the impact of the residual voltage that has reduced discharge tube 102 to power circuit 104, thereby power circuit 104 is protected.
It should be noted that, preferably, the first default sensibility reciprocal is more than or equal to 4uH (microhenry), be less than or equal to 80uH, setting of this first default sensibility reciprocal can ensure in the time that power input interface 101 receives overvoltage, and the first the first voltage that has core inductance 103 two ends to produce can trigger discharge tube 102 conductings.Described predetermined current value is more than or equal to described first has the rated current of core inductance 103 to add 10A, and being less than or equal to described first has the rated current of core inductance 103 to add 100A.The described second default sensibility reciprocal is more than or equal to 0.2uH, is less than or equal to 6uH, and setting of this second default sensibility reciprocal can ensure in the time that first has core inductance 103 saturated, the impact of the residual voltage that reduces described discharge tube 102 to power circuit 104.
Further, described protection circuit, as shown in Figure 2, also comprises: the first resistance 105.
Wherein, the resistance of described the first resistance 105 is not less than preset resistance value.Described preset resistance value is the value of the impact of described power circuit 104 being set for reducing the residual voltage of described discharge tube 102.
Described the first resistance 105 has core inductance 103 to connect with described first, and the first end of described the first resistance 105 is connected with the first end of described discharge tube 102; The second end of described the first resistance 105 and described first has core inductance 103 first ends to be connected.
Concrete, in the time that described first has the specified sensibility reciprocal of core inductance 103 to be not less than the described first default sensibility reciprocal, because having core inductance 103, the first resistance 105 and first is connected in series, the total impedance in discharge tube 102 circuit in parallel with power circuit 104 is the impedance sum that the resistance and first of the first resistance 105 has core inductance 103, like this, in the time that overvoltage is clamped to certain magnitude of voltage by discharge tube 102, because this magnitude of voltage is a certain fixing value, and now, in described protection circuit, increase by the first resistance 105, so the impedance at discharge tube 102 circuit in parallel with power circuit 104 increases, and then the electric current that flows into power circuit 104 is reduced, further power circuit 104 is played a protective role.
It should be noted that, preferred, preset resistance value is more than or equal to 0.02 ohm, is less than or equal to 0.5 ohm.
Further, described protection circuit, as shown in Figure 3, also comprises: protection device 106.
Wherein, described protection device 106 comprises piezo-resistance, and/or Transient Suppression Diode.
The first end of described protection device 106 and described first has the second end of core inductance 103 to be connected; The second end of described protection device 106 is connected with the second end of described power circuit 104.
Concrete, in the time that described protection device 106 comprises described piezo-resistance, the first end of described piezo-resistance and described first has the second end of core inductance 103 to be connected; The second end of described piezo-resistance is connected with the second end of described power circuit 104.
In the time that described protection device 106 comprises described Transient Suppression Diode, the first end of described Transient Suppression Diode and described first has the second end of core inductance 103 to be connected; The second end of described Transient Suppression Diode is connected with the second end of described power circuit 104.
In the time that described protection device 106 comprises described piezo-resistance and described Transient Suppression Diode, the first end of described piezo-resistance and described first has the second end of core inductance 103 to be connected; The second end of described piezo-resistance is connected with the second end of described power circuit 104; Described piezo-resistance and described transient voltage suppressor paralleling.
Described protection device 106, the impact for reducing the residual voltage of described discharge tube 102 to described power circuit 104.
Concrete, after described discharge tube 102 conductings, the residual voltage of described discharge tube 102 is further clamped to less magnitude of voltage by described protection device 106, thereby described power circuit 105 is protected.
It should be noted that, described protection device 106 can also be other protection devices with clamping action, and the present invention does not limit this.
Further, described discharge tube 102 comprises without continuous current discharge electricity pipe.
It should be noted that, described discharge tube 102 can also be the discharge tube of other types, for example, gas discharge tube, the present invention is not restricted this.
It should be noted that, in the present invention, select first to have the core material of core inductance 103 be the material with anti-saturation ability, for example, core material can be iron sial, or ferrite, or noncrystal, or silicon steel sheet or other have material of anti-saturation ability etc., the present invention does not limit this.
It should be noted that, in the present invention, there is the packing forms of core inductance 103 not limit to first, for example, first has the packing forms of core inductance 103 can be for non-closed magnetic core form, or closed magnetic core form, or closed magnetic core adds air gap form, or other packing forms, the present invention does not limit this.
The embodiment of the present invention provides a kind of protection circuit, comprises power input interface, discharge tube, and first has core inductance and power circuit; In the time that power input interface receives overvoltage; first has core inductance can produce the first voltage according to specified sensibility reciprocal; this first voltage can make discharge tube conducting; the overcurrent that the overvoltage that discharge tube can receive power input interface produces is released; now because the residual voltage of discharge tube is higher; need to reduce the residual voltage of discharge tube to the impact of power circuit; first has core inductance to produce second voltage value according to hollow sensibility reciprocal; share a part of residual voltage of discharge tube; reduce the residual voltage of discharge tube to the impact of power circuit, thereby protected power circuit.Because the volume that has core inductance of identical sensibility reciprocal is less than the volume of air core inductor, first to have core inductance and discharge tube to protect power circuit and the present invention adopts, thereby reduce the volume of inductance, and then reduced the volume of circuit, and reduced the cost of circuit.
The embodiment of the present invention provides another kind of protection circuit, as shown in Figure 4, comprising: power input interface 401, discharge tube 402, the second has core inductance 403, the three to have core inductance 404 and power circuit 405.
Wherein, described second has the specified sensibility reciprocal and the described the 3rd of core inductance 403 to have the specified sensibility reciprocal sum of core inductance 404 to be not less than the first default sensibility reciprocal; The described first default sensibility reciprocal is the sensibility reciprocal that ensures that described discharge tube 402 conductings are set.
The first end of described power input interface 401 is connected with the first end of described discharge tube 402; The second end of described power input interface 401 is connected with the second end of described discharge tube 402; Described second has the first end of core inductance 403 to be connected with the first end of described discharge tube 402; Described second has the second end of core inductance 403 to be connected with the first end of described power circuit 405; The described the 3rd has the first end of core inductance 404 and the second end of described discharge tube 402 to be connected; The described the 3rd has the second end of core inductance 404 and the second end of described power circuit 405 to be connected.
Described second has core inductance 403, in the time that described power input interface 401 receives overvoltage, has the specified sensibility reciprocal of core inductance 403 to produce tertiary voltage according to described second.
Wherein, the conducting voltage of described discharge tube is more than or equal to the voltage of the normal work of described power circuit, is less than or equal to described overvoltage.
The described the 3rd has core inductance 404, for in the time that described power input interface 401 receives overvoltage, there is the specified sensibility reciprocal of core inductance 404 to produce the 4th voltage according to the described the 3rd, to make described tertiary voltage and described the 4th voltage sum trigger described discharge tube 402 conductings.
Described discharge tube 402, releases for the overcurrent that described overvoltage is produced.
Described second has core inductance 403, also for after described discharge tube 402 conductings, has the hollow sensibility reciprocal of core inductance 403 to produce the 5th voltage according to described second.
The described the 3rd has core inductance 404, also for after described discharge tube 402 conductings, there is the hollow sensibility reciprocal of core inductance 404 to produce the 6th voltage according to the described the 3rd, the impact of the residual voltage that reduces described discharge tube 402 by described the 5th voltage and described the 6th voltage sum to described power circuit 405.
Further, described second has the saturation current and the described the 3rd of core inductance 403 to have the saturation current sum of core inductance 404 to be not less than predetermined current value.Described second has the hollow sensibility reciprocal and the described the 3rd of core inductance 403 to have the hollow sensibility reciprocal sum of core inductance 404 to be not less than the second default sensibility reciprocal.
Wherein, described predetermined current value is the described second lowest high-current value sum that can bear while having core inductance 403 and the described the 3rd to have core inductance 404 unsaturated.The described second default sensibility reciprocal is the sensibility reciprocal of the impact of described power circuit 405 being set for reducing the residual voltage of described discharge tube 402.
Concrete, power input interface 401 is in the time receiving overvoltage, because overvoltage is to produce moment, flowing through second has core inductance 403 and the 3rd to have the electric current of core inductance 404 all to increase, when flowing through second while having core inductance 403 and the 3rd to have the electric current sum of core inductance 404 to be less than predetermined current value, being second has core inductance 403 and the 3rd to have core inductance 404 all not have when saturated, second has core inductance 403 also to increase according to the second voltage that has the specified sensibility reciprocal of core inductance 403 to produce, be tertiary voltage, the 3rd has core inductance 404 also to increase according to the 3rd voltage that has the specified sensibility reciprocal of core inductance 404 to produce, be the 4th voltage, and this tertiary voltage and the 4th voltage sum have reached the conducting voltage of discharge tube 402, thereby make discharge tube 402 conductings, be that discharge tube 402 is in short-circuit condition, thereby can absorb the overcurrent that overvoltage that power input interface 401 receives produces, now, there is the electric current of core inductance 403 and flow through the 3rd while having the electric current sum of core inductance 404 to be more than or equal to predetermined current value when flowing through second, be second while having core inductance 403 and the 3rd to have core inductance 404 all saturated, second has core inductance 403 to have the hollow sensibility reciprocal of core inductance 403 to produce the 5th voltage according to second, the 3rd has core inductance 404 to have the hollow sensibility reciprocal of core inductance 404 to produce the 6th voltage according to the 3rd, because the residual voltage of discharge tube 402 after conducting is higher, so this 5th voltage and the 6th voltage sum have been shared a part of residual voltage of discharge tube 402, the impact of the residual voltage that has reduced discharge tube 402 to power circuit 405, thereby power circuit 405 is protected.
It should be noted that, preferably, the first default sensibility reciprocal is more than or equal to 4uH (microhenry), be less than or equal to 80uH, setting of this first default sensibility reciprocal can ensure in the time that power input interface 101 receives overvoltage, and the 4th voltage sum that the second tertiary voltage and the 3rd that has core inductance 403 two ends to produce has core inductance 404 two ends to produce can trigger discharge tube 402 conductings.Described predetermined current value is more than or equal to described second has the rated current and the described the 3rd of core inductance 403 to have the rated current sum of core inductance 404 to add 10A, and being less than or equal to described second has the rated current and the described the 3rd of core inductance 403 to have the rated current sum of core inductance 404 to add 100A.The described second default sensibility reciprocal is more than or equal to 0.2uH, be less than or equal to 6uH, setting of this second default sensibility reciprocal can ensure in the time that second has core inductance 403 and the described the 3rd to have core inductance 404 all saturated, the impact of the residual voltage that reduces described discharge tube 402 to power circuit 504.
Further, described protection circuit, also comprises: the second resistance 406.
Wherein, the resistance of described the second resistance 406 is not less than preset resistance value.Described preset resistance value is the value of the impact of described power circuit 405 being set for reducing the residual voltage of described discharge tube 402.
As shown in Figure 5 a, described second has the first end of core inductance 403 to be connected with the first end of described discharge tube 402 by described the second resistance 406.
Concrete, in the time that the described second first end that has a core inductance 403 is connected with the first end of described discharge tube 402 by described the second resistance 406, total impedance in described discharge tube 402 circuit in parallel with described power circuit 405 is the resistance of the second resistance 406, second has the impedance and the 3rd of core inductance 403 to have the impedance sum of core inductance 404, like this, in the time that overvoltage is clamped to certain magnitude of voltage by discharge tube 402, because this magnitude of voltage is a certain fixing value, and now, in described protection circuit, increase by the second resistance 406, so the impedance at discharge tube 402 circuit in parallel with power circuit 405 increases, and then the electric current that flows into power circuit 405 is reduced, further power circuit 405 is played a protective role.
Or as shown in Figure 5 b, the described the 3rd has the first end of core inductance 404 to be connected with the second end of described discharge tube 402 by described the second resistance 406.
It should be noted that; in the time that the described the 3rd first end that has a core inductance 404 is connected with the second end of described discharge tube 402 by described the second resistance 406; can play a protective role to power circuit 405 equally; concrete analysis process is identical with above-mentioned analytic process in the time that described second has the first end of core inductance 403 to be connected with the first end of described discharge tube 402 by described the second resistance 406, and the present invention does not repeat them here.
Further, described protection circuit, as shown in Figure 6, also comprises: the 3rd resistance 407.
Wherein, the resistance of described the 3rd resistance 407 is not less than described preset resistance value.
Described second has the first end of core inductance 403 to be connected with the first end of described discharge tube 402 by described the second resistance 406; The described the 3rd has the first end of core inductance 404 to be connected with the second end of described discharge tube 402 by described the 3rd resistance 407.
It should be noted that have the first end of core inductance 403 to be connected with the first end of described discharge tube 402 by described the second resistance 406 described second; When the described the 3rd first end that has a core inductance 404 is connected with the second end of described discharge tube 402 by described the 3rd resistance 407; can play a protective role to power circuit 405 equally; concrete analysis process is identical with above-mentioned analytic process in the time that described second has the first end of core inductance 403 to be connected with the first end of described discharge tube 402 by described the second resistance 406, and the present invention does not repeat them here.
Further, described protection circuit, as shown in Figure 7, also comprises: protection device 408.
Wherein, described protection device 408 comprises piezo-resistance, and/or Transient Suppression Diode.
The first end of described protection device 408 and described second has the second end of core inductance 403 to be connected; The second end of described protection device 408 and the described the 3rd has the second end of core inductance 404 to be connected.
Concrete, in the time that described protection device 408 comprises described piezo-resistance, the first end of described piezo-resistance and described second has the second end of core inductance 403 to be connected; The second end of described piezo-resistance and the described the 3rd has the second end of core inductance 404 to be connected.
In the time that described protection device 408 comprises described Transient Suppression Diode, the first end of described Transient Suppression Diode and described second has the second end of core inductance 403 to be connected; The second end of described Transient Suppression Diode and the described the 3rd has the second end of core inductance 404 to be connected.
In the time that described protection device 408 comprises described piezo-resistance and described Transient Suppression Diode, the first end of described piezo-resistance and described second has the second end of core inductance to be connected; The second end of described piezo-resistance and the described the 3rd has the second end of core inductance 404 to be connected; Described piezo-resistance and described transient voltage suppressor paralleling.
Described protection device 408, the impact for reducing the residual voltage of described discharge tube 402 to described power circuit 405.
Concrete, after described discharge tube 402 conductings, the residual voltage of described discharge tube 402 is further clamped to less magnitude of voltage by described protection device 408, thereby described power circuit 405 is protected.
It should be noted that, described protection device 408 can also be other protection devices with clamping action, and the present invention does not limit this.
Further, described discharge tube 402 comprises without continuous current discharge electricity pipe.
It should be noted that, described discharge tube 402 can also be the discharge tube of other types, for example, gas discharge tube, the present invention is not restricted this.
It should be noted that, in the present invention, select second to have core inductance 403 and the 3rd to have the core material of core inductance 404 be the material with anti-saturation ability, for example, core material can be iron sial, or ferrite, noncrystal, or silicon steel sheet or other have material of anti-saturation ability etc., and the present invention does not limit this.
It should be noted that, in the present invention, there is core inductance 403 and the 3rd to have the packing forms of core inductance 404 not limit to second, for example, second has core inductance 403 and the 3rd to have the packing forms of core inductance 404 can be for non-closed magnetic core form, or closed magnetic core form, or closed magnetic core adds air gap form, or other packing forms, the present invention does not limit this.
The embodiment of the present invention provides a kind of protection circuit, comprises power input interface, discharge tube, and second has core inductance, and the 3rd has core inductance and power circuit, in the time that power input interface receives overvoltage, second has core inductance can produce tertiary voltage according to specified sensibility reciprocal, the 3rd has core inductance can produce the 4th voltage according to specified sensibility reciprocal, tertiary voltage and the 4th voltage sum can make discharge tube conducting, the overcurrent that the overvoltage that discharge tube can receive power input interface produces is released, now because the residual voltage of discharge tube is higher, need to reduce the residual voltage of discharge tube to the impact of power circuit, second has core inductance to produce the 5th voltage according to hollow sensibility reciprocal, the 3rd has core inductance to produce the 6th voltage according to hollow sensibility reciprocal, the 5th voltage and the 6th voltage have been shared a part of residual voltage of discharge tube, reduce the residual voltage of discharge tube to the impact of power circuit, thereby protect power circuit.Because the volume that has core inductance of identical sensibility reciprocal is less than the volume of air core inductor, be second to have core inductance and the present invention adopts, the 3rd has core inductance and discharge tube to protect power circuit, thereby has reduced the volume of inductance, and then reduced the volume of circuit, and reduce the cost of circuit.
The embodiment of the present invention provides a kind of electronic equipment, as shown in Figure 8, comprises the protection circuit 802 described in load 801 and above-described embodiment.
Wherein, described load 801 comprises at least one functional circuit.
Described protection circuit 802 is connected with described load 801.
Described power circuit in described protection circuit 802, for powering to described load 801.
It should be noted that, according to the field difference of described electronic apparatus application, the realization of described functional circuit is also different.For example, when described electronic equipment is base station, described functional circuit can be receiver module, transmitter module etc.
The embodiment of the present invention provides a kind of electronic equipment, comprises protection circuit, and this protection circuit comprises: power input interface, and discharge tube, first has core inductance and power circuit; In the time that power input interface receives overvoltage; first has core inductance can produce the first voltage according to specified sensibility reciprocal; this first voltage can make discharge tube conducting; the overcurrent that the overvoltage that discharge tube can receive power input interface produces is released; now because the residual voltage of discharge tube is higher; need to reduce the residual voltage of discharge tube to the impact of power circuit; first has core inductance to produce second voltage value according to hollow sensibility reciprocal; share a part of residual voltage of discharge tube; reduce the residual voltage of discharge tube to the impact of power circuit, thereby protected power circuit.Because the volume that has core inductance of identical sensibility reciprocal is less than the volume of air core inductor, first to have core inductance and discharge tube to protect power circuit and the present invention adopts, thereby reduce the volume of inductance, and then reduced the volume of circuit, and reduced the cost of circuit.Or this protection circuit comprises power input interface, discharge tube, second has core inductance, and the 3rd has core inductance and power circuit, in the time that power input interface receives overvoltage, second has core inductance can produce tertiary voltage according to specified sensibility reciprocal, the 3rd has core inductance can produce the 4th voltage according to specified sensibility reciprocal, tertiary voltage and the 4th voltage sum can make discharge tube conducting, the overcurrent that the overvoltage that discharge tube can receive power input interface produces is released, now because the residual voltage of discharge tube is higher, need to reduce the residual voltage of discharge tube to the impact of power circuit, second has core inductance to produce the 5th voltage according to hollow sensibility reciprocal, the 3rd has core inductance to produce the 6th voltage according to hollow sensibility reciprocal, the 5th voltage and the 6th voltage have been shared a part of residual voltage of discharge tube, reduce the residual voltage of discharge tube to the impact of power circuit, thereby protect power circuit.Because the volume that has core inductance of identical sensibility reciprocal is less than the volume of air core inductor, be second to have core inductance and the present invention adopts, the 3rd has core inductance and discharge tube to protect power circuit, thereby has reduced the volume of inductance, and then reduced the volume of circuit, and reduce the cost of circuit.
In the several embodiment that provide in the application, should be understood that, disclosed system, apparatus and method, can realize by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, when actual realization, can have other dividing mode, for example multiple unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in multiple network element.Can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme.
In addition, the each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit comprises, also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that also can adopt hardware to add SFU software functional unit realizes.
The integrated unit that the above-mentioned form with SFU software functional unit realizes, can be stored in a computer read/write memory medium.Above-mentioned SFU software functional unit is stored in a storage medium, comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the part steps of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read-Only Memory, be called for short ROM), the various media that can be program code stored such as random access memory (Random Access Memory, be called for short RAM), magnetic disc or CD.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (12)
1. a protection circuit, is characterized in that, comprising: power input interface, and discharge tube, first has core inductance and power circuit;
The first end of described power input interface is connected with the first end of described discharge tube; The second end of described power input interface is connected with the second end of described discharge tube; Described first has the first end of core inductance and the first end of described discharge tube to be connected; Described first has the second end of core inductance to be connected with the first end of described power circuit; The second end of described power circuit is connected with the second end of described power input interface; Wherein, described first has the specified sensibility reciprocal of core inductance to be not less than the first default sensibility reciprocal; The described first default sensibility reciprocal is the sensibility reciprocal that ensures that described discharge tube conducting is set;
Described first has core inductance, in the time that described power input interface receives overvoltage, has the specified sensibility reciprocal of core inductance to produce the first voltage according to described first, to make discharge tube conducting described in described the first voltage triggered; The conducting voltage of described discharge tube is more than or equal to the voltage of the normal work of described power circuit, is less than or equal to described overvoltage;
Described discharge tube, releases for the overcurrent that described overvoltage is produced;
Described first has core inductance, also for after described discharge tube conducting, has the hollow sensibility reciprocal of core inductance to produce second voltage according to described first, and reduces the residual voltage of described discharge tube to the impact of described power circuit by described second voltage.
2. circuit according to claim 1, is characterized in that, described protection circuit also comprises: the first resistance; Wherein, the resistance of described the first resistance is not less than preset resistance value; Described preset resistance value is the value of the impact of described power circuit being set for reducing the residual voltage of described discharge tube;
Described the first resistance has core inductance to connect with described first, and the first end of described the first resistance is connected with the first end of described discharge tube; The second end of described the first resistance and described first has core inductance first end to be connected.
3. circuit according to claim 1 and 2, is characterized in that, described protection circuit also comprises: protection device;
The first end of described protection device and described first has the second end of core inductance to be connected; The second end of described protection device is connected with the second end of described power circuit;
Described protection device, states the impact of power circuit to the impact of described power circuit for reducing the residual voltage of described discharge tube.
4. circuit according to claim 3, is characterized in that, described protection device comprises piezo-resistance, and/or Transient Suppression Diode;
In the time that described protection device comprises described piezo-resistance, the first end of described piezo-resistance and described first has the second end of core inductance to be connected; The second end of described piezo-resistance is connected with the second end of described power circuit;
In the time that described protection device comprises described Transient Suppression Diode, the first end of described Transient Suppression Diode and described first has the second end of core inductance to be connected; The second end of described Transient Suppression Diode is connected with the second end of described power circuit;
In the time that described protection device comprises described piezo-resistance and described Transient Suppression Diode, the first end of described piezo-resistance and described first has the second end of core inductance to be connected; The second end of described piezo-resistance is connected with the second end of described power circuit; Described piezo-resistance and described transient voltage suppressor paralleling.
5. according to the circuit described in claim 1-4 any one, it is characterized in that, described first has the saturation current of core inductance to be not less than predetermined current value; Described predetermined current value is the described first lowest high-current value that can bear while having core inductance unsaturated;
Described first has the hollow sensibility reciprocal of core inductance to be not less than the second default sensibility reciprocal; The described second default sensibility reciprocal is the sensibility reciprocal of the impact of described power circuit being set for reducing the residual voltage of described discharge tube.
6. according to the circuit described in claim 1-5 any one, it is characterized in that, described discharge tube comprises without continuous current discharge electricity pipe.
7. a protection circuit, is characterized in that, comprising: power input interface, and discharge tube, second has core inductance, and the 3rd has core inductance and power circuit; Described second has the specified sensibility reciprocal and the described the 3rd of core inductance to have the specified sensibility reciprocal sum of core inductance to be not less than the first default sensibility reciprocal; The described first default sensibility reciprocal is the sensibility reciprocal that ensures that described discharge tube conducting is set;
The first end of described power input interface is connected with the first end of described discharge tube; The second end of described power input interface is connected with the second end of described discharge tube; Described second has the first end of core inductance and the first end of described discharge tube to be connected; Described second has the second end of core inductance to be connected with the first end of described power circuit; The described the 3rd has the first end of core inductance and the second end of described discharge tube to be connected; The described the 3rd has the second end of core inductance and the second end of described power circuit to be connected;
Described second has core inductance, in the time that described power input interface receives overvoltage, has the specified sensibility reciprocal of core inductance to produce tertiary voltage according to described second; The conducting voltage of described discharge tube is more than or equal to the voltage of the normal work of described power circuit, is less than or equal to described overvoltage;
The described the 3rd has core inductance, in the time that described power input interface receives overvoltage, has the specified sensibility reciprocal of core inductance to produce the 4th voltage according to the described the 3rd, to make described tertiary voltage and described the 4th voltage sum trigger described discharge tube conducting;
Described discharge tube, releases for the overcurrent that described overvoltage is produced;
Described second has core inductance, also for after described discharge tube conducting, has the hollow sensibility reciprocal of core inductance to produce the 5th voltage according to described second;
The described the 3rd has core inductance, also for after described discharge tube conducting, there is the hollow sensibility reciprocal of core inductance to produce the 6th voltage according to the described the 3rd, reduce the residual voltage of described discharge tube to the impact of described power circuit by described the 5th voltage and described the 6th voltage sum.
8. circuit according to claim 7, is characterized in that, described protection circuit also comprises: the second resistance; Wherein, the resistance of described the second resistance is not less than preset resistance value; Described preset resistance value is the value of the impact of described power circuit being set for reducing the residual voltage of described discharge tube;
Described second has the first end of core inductance to be connected with the first end of described discharge tube by described the second resistance; Or the described the 3rd has the first end of core inductance to be connected with the second end of described discharge tube by described the second resistance.
9. according to the circuit described in claim 7 or 8, it is characterized in that, described protection circuit also comprises: the 3rd resistance; Wherein, the resistance of described the 3rd resistance is not less than described preset resistance value;
Described second has the first end of core inductance to be connected with the first end of described discharge tube by described the second resistance; The described the 3rd has the first end of core inductance to be connected with the second end of described discharge tube by described the 3rd resistance.
10. according to the circuit described in claim 7-9 any one, it is characterized in that, described protection circuit also comprises: protection device;
The first end of described protection device and described second has the second end of core inductance to be connected; The second end of described protection device and the described the 3rd has the second end of core inductance to be connected;
Described protection device, the impact for reducing the residual voltage of described discharge tube to described power circuit.
11. according to the circuit described in claim 7-10 any one, it is characterized in that, described second has the saturation current and the described the 3rd of core inductance to have the saturation current sum of core inductance to be not less than predetermined current value; Described predetermined current value is the described second lowest high-current value sum that can bear while having core inductance and the described the 3rd to have core inductance unsaturated;
Described second has the hollow sensibility reciprocal and the described the 3rd of core inductance to have the hollow sensibility reciprocal sum of core inductance to be not less than the second default sensibility reciprocal; The described second default sensibility reciprocal is the sensibility reciprocal of the impact of described power circuit being set for reducing the residual voltage of described discharge tube.
12. 1 kinds of electronic equipments, is characterized in that, comprise the protection circuit described in load and claim 1-11 any one; Described protection circuit is connected with described load;
Described power circuit in described protection circuit, for giving described load supplying.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410228120.7A CN104022497A (en) | 2014-05-27 | 2014-05-27 | Protective circuit and electronic equipment |
| PCT/CN2014/090114 WO2015180413A1 (en) | 2014-05-27 | 2014-10-31 | Protection circuit and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410228120.7A CN104022497A (en) | 2014-05-27 | 2014-05-27 | Protective circuit and electronic equipment |
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| CN104022497A true CN104022497A (en) | 2014-09-03 |
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| WO (1) | WO2015180413A1 (en) |
Cited By (1)
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|---|---|---|---|---|
| WO2015180413A1 (en) * | 2014-05-27 | 2015-12-03 | 华为技术有限公司 | Protection circuit and electronic device |
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| CN106208020A (en) * | 2016-08-17 | 2016-12-07 | 深圳市槟城电子有限公司 | A kind of composite gas discharge tube |
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