CN208508516U - A kind of AC power source surge protective device and electronic equipment - Google Patents

A kind of AC power source surge protective device and electronic equipment Download PDF

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Publication number
CN208508516U
CN208508516U CN201820861805.9U CN201820861805U CN208508516U CN 208508516 U CN208508516 U CN 208508516U CN 201820861805 U CN201820861805 U CN 201820861805U CN 208508516 U CN208508516 U CN 208508516U
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protective device
voltage
discharge tube
over
power source
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陈国源
蔡锦波
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Shenzhen Penang Electronics Co.,Ltd.
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SHENZHEN BENCENT ELECTRONICS CO Ltd
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Abstract

The utility model embodiment discloses a kind of AC power source surge protective device and electronic equipment.Wherein, which includes semiconductor discharge tube, over-voltage protective device and current limliting module;Wherein, semiconductor discharge tube and current limliting block coupled in series, over-voltage protective device are connected with current limliting wired in parallel, and current limliting module and over-voltage protective device are used to limit the electric current on semiconductor discharge tube.The technical solution of the utility model embodiment can limit the electric current for flowing through semiconductor discharge tube, over-current protecting element is avoided to act while realizing overvoltage protection, lead to subsequent equipment power down.

Description

A kind of AC power source surge protective device and electronic equipment
Technical field
The utility model relates to over-voltage protection technology field more particularly to a kind of AC power source surge protective devices and electronics Equipment.
Background technique
Over-voltage be struck by lightning often in a manner of cable conduction or electromagnetic induction by the power supply of low-voltage power supply cable intrusion equipment Port causes over-voltage and over-current to impact the component of power unit, therefore the power port of nearly all electrical equipment is all taken A degree of lightning protection measures resist the threat of this lightning stroke over-voltage.
In addition to the lightning stroke of nature, the switch motion of the occasions such as electric substation can also introduce surge interference, such as: main power source system Interference when switching;Same power grid, the interference formed in some small switch bounces near power receiving equipment;Switching with The thyristor equipment of resonance circuit;Various systematic failures, as between equipment ground network or earthed system short circuit and it is winged Arc failure.
In the prior art, semiconductor discharge tube is connected in parallel on to the both ends of circuit to be protected, the both ends difference of circuit to be protected It is electrically connected with the two-port of AC power source.When generating surge voltage due to influences such as lightning strokes, so that the both ends of circuit to be protected Overtension, higher than semiconductor discharge tube break over voltage when, semiconductor discharge tube conducting, to realize overvoltage protection, in wave After gushing loss of voltage, semiconductor discharge tube ends in AC power source zero crossing.Due to semiconductor discharge tube on state resistance and On-state voltage drop is smaller, causes the surge current for flowing through semiconductor discharge tube and power frequency continued flow larger, be easy to cause overcurrent protection Element (electric current that can monitor the port outflow of AC power source) movement, there are power down risks.
Utility model content
The utility model embodiment provides a kind of AC power source surge protective device and electronic equipment, to realize that overvoltage is protected While shield, the electric current of semiconductor discharge tube is flowed through in limitation, avoids over-current protecting element from acting, leads to subsequent equipment power down.
In a first aspect, the utility model embodiment provides a kind of AC power source surge protective device, including semiconductor is put Fulgurite, over-voltage protective device and current limliting module;
Wherein, semiconductor discharge tube and current limliting block coupled in series, over-voltage protective device are connected with current limliting wired in parallel, current limliting mould Block and over-voltage protective device are used to limit the electric current on semiconductor discharge tube.
Further, semiconductor discharge tube is bidirectional semiconductor discharge tube.
Further, it is in Low ESR that over-voltage protective device, which is used for the conducting when surge voltage occurs, is flowed through with limitation and is partly led The electric current of body discharge tube and the voltage of current limliting module;It is in high resistant after surge voltage disappearance, and before semiconductor discharge tube shutdown It is anti-;
Current limliting module is used for after surge voltage disappearance, and before semiconductor discharge tube shutdown, semiconductor electric discharge is flowed through in limitation The continuous electric current of pipe.
Further, over-voltage protective device includes gas-discharge tube, varistor or two-way Transient Suppression Diode.
Further, when over-voltage protective device includes gas-discharge tube, gas-discharge tube is open failure gas discharge Pipe.
Further, current limliting module includes following at least one: resistance and inductance.
Further, current limliting module includes first resistor, wherein first resistor is in parallel with over-voltage protective device.
Further, current limliting module includes the first inductance, wherein the first inductance is in parallel with over-voltage protective device.
Further, current limliting module includes the second resistance being connected in series and the second inductance, wherein second resistance and second Both ends after inductance series connection, it is in parallel with over-voltage protective device.
Second aspect, the utility model embodiment additionally provide a kind of electronic equipment, comprising: the utility model is arbitrarily implemented The AC power source surge protective device and circuit to be protected that example provides, wherein put respectively with semiconductor at the both ends of circuit to be protected Both ends after fulgurite is connect with current limliting block coupled in series are electrically connected.
It further, further include over-current protecting element, wherein at least one end of circuit to be protected passes through overcurrent protection Element is electrically connected with the corresponding ports of AC power source, and over-current protecting element is used to monitor the electricity of the port outflow of AC power source When stream is more than pre-set current value, make to form open circuit between circuit to be protected and AC power source.
Further, over-current protecting element is breaker.
The technical solution of the utility model embodiment is by by semiconductor discharge tube and current limliting block coupled in series, over-voltage protector Part is connected with current limliting wired in parallel, and current limliting module and over-voltage protective device are in the different stages, limiting semiconductor discharge tube On electric current, when solving overvoltage protection, due to semiconductor discharge tube conducting when impedance it is smaller, flow through semiconductor discharge tube Electric current is larger, be easy to cause over-current protecting element (electric current that can monitor the port outflow of AC power source) movement, there are power down The problem of risk, to improve the reliability of surge protective device.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of AC power source surge protective device provided by the embodiment of the utility model;
Fig. 2 is the structural schematic diagram of a kind of electronic equipment provided by the embodiment of the utility model;
Fig. 3 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Fig. 4 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Fig. 5 is a kind of VA characteristic curve schematic diagram of bidirectional semiconductor discharge tube provided by the embodiment of the utility model;
Fig. 6 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Fig. 7 is a kind of VA characteristic curve schematic diagram of gas-discharge tube provided by the embodiment of the utility model;
Fig. 8 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Fig. 9 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Figure 10 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Figure 11 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Figure 12 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model;
Figure 13 is the structural schematic diagram of another electronic equipment provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
The utility model embodiment provides a kind of AC power source surge protective device.Fig. 1 mentions for the utility model embodiment A kind of structural schematic diagram of the AC power source surge protective device supplied.The AC power source surge protective device can be used for realizing over-voltage Protection.Fig. 2 is the structural schematic diagram of a kind of electronic equipment provided by the embodiment of the utility model.Fig. 2 illustratively draws the friendship A kind of application scenarios of galvanic electricity source surge protective device.Referring to figs. 1 and 2, which includes Semiconductor discharge tube 110, over-voltage protective device 120 and current limliting module 130.
Wherein, semiconductor discharge tube 110 is connected with current limliting module 130, and over-voltage protective device 120 and current limliting module 130 are simultaneously Connection connection, current limliting module 130 and over-voltage protective device 120 are used to limit the electric current on semiconductor discharge tube 110.
Wherein, the both ends after semiconductor discharge tube 110 and current limliting module 130 are connected in series, for respectively with electricity to be protected The both ends on road 200 are electrically connected.The both ends of circuit 200 to be protected are electrically connected with the two-port of AC power source respectively.
Wherein, when the voltage at 110 both ends of semiconductor discharge tube is less than break over voltage, semiconductor discharge tube 110 ends, and is in High-impedance state;When the voltage at 110 both ends of semiconductor discharge tube is increased above or is equal to break over voltage, semiconductor discharge tube 110 It will become being connected from cut-off, and be in low resistance state;When the electric current on the semiconductor discharge tube 110 after conducting is lower than electric current is maintained, half Conductive discharge pipe 110 will be become ending from conducting, restore to be in high-impedance state.The over-voltage protective device 120 can be switching mode over-voltage Protective device or clamper type over-voltage protective device.Wherein, the impedance value after the conducting of switching mode over-voltage protective device is with its electric current Reduce and increases.The clamp voltage of clamper type over-voltage protective device is greater than the alternating voltage when normal work of circuit to be protected Amplitude, less than the withstanding voltage of circuit 200 to be protected.If over-voltage protective device 120 is switching mode over-voltage protective device, work as switch When the voltage at type over-voltage protective device both ends is less than cut-in voltage, the cut-off of switching mode over-voltage protective device is in high-impedance state;Work as switch When the voltage at type over-voltage protective device both ends is increased above or is equal to cut-in voltage, switching mode over-voltage protective device will be by ending Become being connected, is in low resistance state.If over-voltage protective device 120 is clamper type over-voltage protective device, when clamper type over-voltage protective device When the voltage at both ends is less than clamp voltage, the cut-off of clamper type over-voltage protective device is in high-impedance state;When clamper type over-voltage protective device When the voltage at both ends is increased above or is equal to clamp voltage, clamper type over-voltage protective device will be become being connected from cut-off, in low Resistance state, and the voltage at clamper type over-voltage protective device both ends will be clamped near clamp voltage.The work of circuit 200 to be protected Voltage is less than the break over voltage of semiconductor discharge tube 110, and the break over voltage of semiconductor discharge tube 110 is less than circuit 200 to be protected Withstanding voltage.According to the normal working voltage and withstanding voltage of circuit 200 to be protected, turning for semiconductor discharge tube 110 is determined Voltage is rolled over, and then chooses the model of required semiconductor discharge tube 110.Current limliting module 130 can be constant impedance module, current limliting The impedance value when impedance value of module 130 ends much smaller than semiconductor discharge tube 110, the impedance value of current limliting module 130 are much smaller than Impedance value when over-voltage protective device 120 ends.Optionally, current limliting module 130 includes following at least one: resistance and inductance. When normal work, semiconductor discharge tube 110 connect with current limliting module 130 after first end N1 and second end N2 between voltage be Alternating voltage is in sinusoidal variations.The AC power source can be phase voltage (voltage i.e. between firewire and zero curve), line voltage (i.e. Voltage between two firewires) or other AC power supply modules output alternating voltage, the utility model embodiment is to AC power source Voltage magnitude and frequency without limitation, Fig. 2 is exemplary to draw the case where AC power source is derived from the firewire L and zero curve N of alternating current.
Wherein, it is illustrated so that over-voltage protective device 120 is switching mode over-voltage protective device as an example, overvoltage does not occur When, that is, work normally when, semiconductor discharge tube 110 connect with current limliting module 130 after first end N1 and second end N2 between Voltage is less than the break over voltage of semiconductor discharge tube 110, at this point, semiconductor discharge tube 110 is cut-off, is in high-impedance state, is much larger than The resistance value of current limliting module 130, and over-voltage protective device 120 is cut-off, is in high-impedance state, much larger than the resistance value of current limliting module 130, therefore The voltage at 110 both ends of semiconductor discharge tube is approximately the voltage between first end N1 and second end N2 at this time.
When overvoltage (surge voltage that circuit is struck by lightning or the reasons such as electromagnetic interference generate) occurs, semiconductor discharge tube 110 connect with current limliting module 130 after first end N1 and second end N2 between voltage be greater than semiconductor discharge tube 110 turnover Voltage becomes low resistance state from high-impedance state rapidly at this point, semiconductor discharge tube 110 is become being connected from cut-off, is much smaller than current limliting module 130 resistance value, therefore the electric current flowed through on semiconductor discharge tube 110 and current limliting module 130 increases rapidly, 130 both ends of current limliting module Voltage increase rapidly, when the voltage at 130 both ends of current limliting module is increased above or electric equal to the unlatching of over-voltage protective device 120 When pressure, over-voltage protective device 120 is become being connected from cut-off, becomes low resistance state from high-impedance state rapidly, less than the resistance of current limliting module 130 Value, and the resistance value for being greater than semiconductor discharge tube 110 avoids exceeding circuit to be protected to limit the voltage at 130 both ends of current limliting module 200 withstanding voltage, over-voltage protective device 120 plays main metering function at this time, and the size relation of impedance value at this time is Z1 < Z2 < Z3, wherein Z1 is the resistance value of semiconductor discharge tube 110, and Z2 is the resistance value of over-voltage protective device 120;Z3 is limited flow module 130 Impedance value.
After having served as loss of voltage, the voltage between first end N1 and second end N2 restores normal, and voltage is in sinusoidal variations, this When, the voltage between first end N1 and second end N2 is much smaller than surge voltage, so that the electric current for flowing through over-voltage protective device 120 subtracts Small, the impedance of over-voltage protective device 120 increases, and greater than the resistance value of current limliting module 130, current limliting module 130 plays main current limliting at this time Effect, the size relation of impedance value at this time are Z1 < Z3 < Z2;With the reduction of sinusoidal voltage, semiconductor discharge tube 110 is flowed through Electric current will reduce, when the voltage in sinusoidal variations is close to zero crossing, the electric current for flowing through semiconductor discharge tube 110 will be less than tieing up Electric current is held, 110 spontaneous recovery of semiconductor discharge tube returns to off-state, and semiconductor discharge tube 110 is equivalent to an infinitely great electricity Resistance, the electric current for then flowing through over-voltage protective device 120 will be reduced to zero, and over-voltage protective device 120 will end, and then restore exchange Power supply is to 200 normal power supply of circuit to be protected.
It should be noted that if over-voltage protective device 120 is clamper type over-voltage protective device, the course of work and switching mode mistake Press protective device similar, difference is when overvoltage occurs, can be fast when clamper type over-voltage protective device becomes conducting from ending Speed becomes low resistance state from high-impedance state, less than the resistance value of current limliting module 130, and is greater than the resistance value of semiconductor discharge tube 110, and limit The voltage at 130 both ends of current limliting module is clamp voltage, avoids exceeding the withstanding voltage of circuit 200 to be protected.Loss of voltage is served as Afterwards, the amplitude of normal working voltage is lower than clamp voltage, and clamper type over-voltage protective device becomes ending from being connected, can be rapidly by low Resistance state becomes high-impedance state, greater than the resistance value of current limliting module 130.
It should be noted that Fig. 3 is another AC power source surge protective device provided by the embodiment of the utility model Structural schematic diagram, as shown in figure 3, if the electric current for flowing through semiconductor discharge tube 110 is only limited by current limliting module 130, in surge When voltage occurs, the impedance value of current limliting module 130 is larger, and the voltage of current limliting module 130 is higher, cannot achieve overvoltage protection function Energy.Fig. 4 is the structural schematic diagram of another AC power source surge protective device provided by the embodiment of the utility model, such as Fig. 4 institute Show, if only limiting the electric current for flowing through semiconductor discharge tube 110 by switching mode over-voltage protective device 140, disappears in surge voltage During afterflow afterwards (in the voltage of sinusoidal variations close to before zero crossing), the electric current of switching mode over-voltage protective device 140 is flowed through It is larger, it be easy to cause over-current protecting element to act.If the over-voltage protective device 120 in Fig. 1 is switching mode over-voltage protective device, Surge protective device in Fig. 1 is when surge voltage occurs, it can be achieved that over-voltage protection function;It is continuous after surge voltage disappearance During stream, since normal voltage is much smaller than surge voltage, therefore the electric current for flowing through switching mode over-voltage protective device reduces, switching mode mistake The impedance value and voltage for pressing protective device will increase, and the electric current that current limliting module 130 is divided increases, and leads to switching mode over-voltage protector The electric current of part further decreases, and the impedance value and voltage of switching mode over-voltage protective device will be further increased, and can further limit The electric current of semiconductor discharge tube, prevents over-current protecting element from acting.
The technical solution of the present embodiment is by by semiconductor discharge tube and current limliting block coupled in series, over-voltage protective device and current limliting Wired in parallel connection, current limliting module and impedance are in the over-voltage protective device of dynamic change in the different stages, limitation partly to be led Electric current on body discharge tube, when solving overvoltage protection, impedance when due to semiconductor discharge tube conducting is smaller, flows through semiconductor The electric current of discharge tube is larger, be easy to cause over-current protecting element (electric current that can monitor the port outflow of AC power source) movement, There are problems that power down risk, to improve the reliability of surge protective device.
Optionally, on the basis of the above embodiments, semiconductor discharge tube 110 is bidirectional semiconductor discharge tube.Fig. 5 is this A kind of VA characteristic curve schematic diagram for bidirectional semiconductor discharge tube that utility model embodiment provides.Wherein, horizontal axis indicates double To the voltage V at semiconductor discharge tube both ends1, the longitudinal axis indicates to flow through the electric current I of bidirectional semiconductor discharge tube1, as shown in figure 5, two-way The VA characteristic curve of semiconductor discharge tube is located at first quartile and third quadrant, and about origin symmetry.According to first quartile VA characteristic curve it is found that i.e. bidirectional semiconductor discharge tube both ends applied voltage be forward voltage, when bidirectional semiconductor is put The additional forward voltage at fulgurite both ends is lower than off state voltage VDRMWhen, leakage current very little is in an off state.Work as bidirectional semiconductor The additional forward voltage at discharge tube both ends is greater than break over voltage VSWhen, bidirectional semiconductor discharge tube enters on state quickly, double To the pressure drop very little at semiconductor discharge tube both ends.After the additional forward voltage at bidirectional semiconductor discharge tube both ends removes, or it is outer Forward voltage is added to be decreased to 0, electric current is fallen below soon maintains electric current IH, bidirectional semiconductor discharge tube spontaneous recovery returns to Off-state.According to the VA characteristic curve of third quadrant it is found that the applied voltage at i.e. bidirectional semiconductor discharge tube both ends is negative To voltage, when the absolute value of the additional negative voltage at bidirectional semiconductor discharge tube both ends is lower than off state voltage VDRMWhen, leakage current is very It is small, it is in an off state.When the absolute value of the additional negative voltage at bidirectional semiconductor discharge tube both ends is higher than break over voltage VSWhen, Bidirectional semiconductor discharge tube enters on state, the pressure drop very little at bidirectional semiconductor discharge tube both ends quickly.Work as bidirectional semiconductor After the additional negative voltage at discharge tube both ends is removed or the absolute value of additional negative voltage is decreased to 0, and the absolute value of electric current is quickly It just falls below and maintains electric current IH, bidirectional semiconductor discharge tube spontaneous recovery returns to off-state.
Optionally, on the basis of the above embodiments, over-voltage protective device 120, which is used to be connected when surge voltage occurs, is in Low ESR flows through the electric current of semiconductor discharge tube 110 and the voltage of current limliting module 130 to limit;After surge voltage disappearance, and It is in high impedance before semiconductor discharge tube 110 turns off, i.e. impedance after the conducting of over-voltage protective device 120 (during low resistance state) is In dynamic change;Before current limliting module 130 is used for after surge voltage disappearance, and semiconductor discharge tube 110 turns off, limitation is flowed through The continuous electric current of semiconductor discharge tube 110.
The utility model embodiment provides another AC power source surge protective device.Fig. 6 is the utility model embodiment The structural schematic diagram of another the AC power source surge protective device provided.On the basis of the above embodiments, as shown in fig. 6, Over-voltage protective device is switching mode over-voltage protective device, and switching mode over-voltage protective device includes gas-discharge tube 121.
Wherein, Fig. 7 is a kind of VA characteristic curve schematic diagram of gas-discharge tube provided by the embodiment of the utility model.Its In, horizontal axis indicates the voltage V at gas-discharge tube both ends2, the longitudinal axis indicates to flow through the electric current I of gas-discharge tube2, as shown in fig. 7, gas The VA characteristic curve of body discharge tube is located at first quartile and third quadrant, and about origin symmetry.Wherein, VBRFor gas discharge The cut-in voltage of pipe, VGlowFor the glow voltage of gas-discharge tube, VAFor the arc voltage of gas-discharge tube.Gas-discharge tube Discharge process need to (voltage at the both ends of corresponding gas-discharge tube be gradually increased to the mistake of cut-in voltage by Townsend region of discharge A Journey), glow discharge zone B (i.e. glow discharge state), can enter arc discharge area C (enter arc discharge when reaching glow voltage State).At glow discharge zone, the electric current of gas-discharge tube is smaller, at arc discharge area, the electric current of gas-discharge tube compared with Greatly.Maintain voltage value required for the afterflow of arc discharge than maintaining the voltage value of glow discharge small.At arc discharge area, The impedance value of gas-discharge tube increases with the reduction of electric current.After surge voltage disappearance, with the reduction of voltage, pass through gas The electric current of discharge tube is also accordingly reduced, when electric current drops to needed for maintaining arc light state below minimum current value, arc discharge Stop, the aura of gas-discharge tube extinguishes.
Optionally, on the basis of the above embodiments, Fig. 8 is another AC power source provided by the embodiment of the utility model The structural schematic diagram of surge protective device, over-voltage protective device are clamper type over-voltage protective device, clamper type over-voltage protective device Including varistor 122.
Optionally, on the basis of the above embodiments, Fig. 9 is another AC power source provided by the embodiment of the utility model The structural schematic diagram of surge protective device, over-voltage protective device are clamper type over-voltage protective device, clamper type over-voltage protective device Including two-way Transient Suppression Diode 123.
Optionally, on the basis of the above embodiments, with continued reference to Fig. 6, Fig. 8 and Fig. 9, current limliting module includes first resistor R1, wherein first resistor R1 is in parallel with over-voltage protective device.During the afterflow after surge voltage disappearance, first resistor R1 can Play the role of the power frequency continued flow for inhibiting to flow through semiconductor discharge tube.
Optionally, on the basis of the above embodiments, Figure 10 is another alternating current provided by the embodiment of the utility model The structural schematic diagram of source surge protective device, as shown in Figure 10, current limliting module include the first inductance L1, wherein the first inductance L1 It is in parallel with over-voltage protective device.First inductance L1 can play the role of inhibiting inrush current spike.Wherein, the over-voltage protective device It can be switching mode over-voltage protective device or clamper type over-voltage protective device.Over-voltage protective device is illustratively drawn in Figure 10 is The case where gas-discharge tube.
Optionally, on the basis of the above embodiments, Figure 11 is another alternating current provided by the embodiment of the utility model The structural schematic diagram of source surge protective device, as shown in figure 11, current limliting module include the second resistance R2 and second being connected in series Inductance L2, wherein the both ends after second resistance R2 and the second inductance L2 series connection, it is in parallel with over-voltage protective device.Second electricity Resistance R2 and the second inductance L2 can play the role of the power frequency continued flow for inhibiting to flow through semiconductor discharge tube and inhibit inrush current spike. Wherein, which can be switching mode over-voltage protective device or clamper type over-voltage protective device.It is exemplary in Figure 11 Draw over-voltage protective device be gas-discharge tube the case where.
It should be noted that optional, current limliting module includes first capacitor, wherein first capacitor and over-voltage protective device Parallel connection, to allow first capacitor to inhibit to flow through the power frequency continued flow of semiconductor discharge tube, the capacitance of first capacitor is larger, volume compared with Greatly, higher cost.Therefore the current limliting module of the utility model embodiment generally use smaller impedance value and the resistance of small volume or The form of inductance and combinations thereof, to have the function that the power frequency continued flow for inhibiting to flow through semiconductor discharge tube.
Optionally, on the basis of the above embodiments, Figure 12 is another alternating current provided by the embodiment of the utility model The structural schematic diagram of source surge protective device, as shown in figure 12, gas-discharge tube are open failure gas-discharge tube 124.This is opened The structure and patent application CN105826149A of road failure gas-discharge tube 124 (application number: are recorded in 201610190179.0) Gas-discharge tube structure it is same or like.When the temperature of open failure gas-discharge tube 124 is because of continuous discharge, reach make it is low It opens a way when the temperature of temperature sealing binder fusing, avoids that (such as network voltage is abnormal, and amplitude increases when AC power source is abnormal for a long time When greatly), semiconductor discharge tube is caused frequently to be continuously turned on (be connected i.e. in half of power frequency period primary) for a long time, and flow through big Electric current leads to thermal accumlation, causes the short-circuit failure of common gases discharge tube or bursts, and then causes semiconductor discharge tube short-circuit Failure.
The utility model embodiment provides a kind of electronic equipment.With continued reference to Fig. 2, which includes: that this is practical new The AC power source surge protective device 100 and circuit to be protected 200 that type any embodiment provides, wherein circuit 200 to be protected Both ends after both ends are connected in series with semiconductor discharge tube 110 with current limliting module 130 respectively are electrically connected.
Wherein, which can be television set, laptop, air-conditioning, communication power supply, video camera, network exchange Machine etc..Electronic equipment provided by the embodiment of the utility model includes the AC power source surge protective device in above-described embodiment, because This electronic equipment provided by the embodiment of the utility model also has beneficial effect described in above-described embodiment, no longer superfluous herein It states.
Optionally, on the basis of the above embodiments, Figure 13 is that another electronics provided by the embodiment of the utility model is set Standby structural schematic diagram.The electronic equipment further includes over-current protecting element 300, wherein at least one end of circuit 200 to be protected It is electrically connected by over-current protecting element 300 with the corresponding ports of AC power source, over-current protecting element 300 is for monitoring to hand over When the electric current of the port outflow in galvanic electricity source is more than pre-set current value, make to form open circuit between circuit 200 to be protected and AC power source.
Wherein, over-current protecting element 300 can be fuse.Optionally, over-current protecting element 300 can also be disconnected Road device.The breaker can be air-break circuit-breaker.If the overcurrent sensing circuit of breaker detects the port flow of AC power source When electric current out is more than rated current, by the main contacts of automatic cut-off breaker.The overcurrent sensing circuit can be overcurrent Buckle releaser.At least one end of circuit to be protected is electrically connected by the main contacts of breaker with the corresponding ports of AC power source.
It should be noted that lightning stroke duration be usually it is of short duration, in microsecond rank.It is continuous after surge voltage disappearance Duration during stream is millisecond rank, less than half power frequency period, therefore during the afterflow after surge voltage disappearance, convection current The restriction effect for crossing the continuous electric current of semiconductor discharge tube is critically important, (can monitor AC power source to solve over-current protecting element The electric current of port outflow) movement, there are problems that power down risk.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright Aobvious variation is readjusted, be combined with each other and is substituted without departing from the protection scope of the utility model.Therefore, although passing through Above embodiments are described in further detail the utility model, but the utility model is not limited only to the above implementation Example can also include more other equivalent embodiments in the case where not departing from the utility model design, and the utility model Range is determined by the scope of the appended claims.

Claims (12)

1. a kind of AC power source surge protective device, which is characterized in that including semiconductor discharge tube, over-voltage protective device and current limliting Module;
Wherein, the semiconductor discharge tube and the current limliting block coupled in series, the over-voltage protective device and the current limliting module are simultaneously Connection connection, the current limliting module and the over-voltage protective device are used to limit the electric current on the semiconductor discharge tube.
2. AC power source surge protective device according to claim 1, which is characterized in that the semiconductor discharge tube is double To semiconductor discharge tube.
3. AC power source surge protective device according to claim 1 or 2, which is characterized in that
It is in Low ESR that the over-voltage protective device, which is used for the conducting when surge voltage occurs, flows through the semiconductor electric discharge with limitation The voltage of the electric current of pipe and the current limliting module;It is in high resistant after surge voltage disappearance, and before semiconductor discharge tube shutdown It is anti-;
The current limliting module is used for after surge voltage disappearance, and before semiconductor discharge tube shutdown, limitation flows through described half The continuous electric current of conductive discharge pipe.
4. AC power source surge protective device according to claim 1, which is characterized in that the over-voltage protective device includes Gas-discharge tube, varistor or two-way Transient Suppression Diode.
5. AC power source surge protective device according to claim 4, which is characterized in that when the over-voltage protective device packet When including gas-discharge tube, the gas-discharge tube is open failure gas-discharge tube.
6. AC power source surge protective device according to claim 1, which is characterized in that the current limliting module includes following It is at least one: resistance and inductance.
7. AC power source surge protective device according to claim 6, which is characterized in that the current limliting module includes first Resistance, wherein the first resistor is in parallel with the over-voltage protective device.
8. AC power source surge protective device according to claim 6, which is characterized in that the current limliting module includes first Inductance, wherein first inductance is in parallel with the over-voltage protective device.
9. AC power source surge protective device according to claim 6, which is characterized in that the current limliting module includes series connection The second resistance of connection and the second inductance, wherein the both ends after the second resistance and second inductance series connection, with institute It is in parallel to state over-voltage protective device.
10. a kind of electronic equipment characterized by comprising any AC power source surge protective device of claim 1-9 With circuit to be protected, wherein after the both ends of the circuit to be protected are connect with semiconductor discharge tube with current limliting block coupled in series respectively Both ends electrical connection.
11. electronic equipment according to claim 10, which is characterized in that further include over-current protecting element, wherein described At least one end of circuit to be protected is electrically connected by the over-current protecting element with the corresponding ports of AC power source, described excessively electric When stream protection element is used to monitor that the electric current of the port outflow of the AC power source to be more than pre-set current value, make described to be protected Open circuit is formed between circuit and the AC power source.
12. electronic equipment according to claim 11, which is characterized in that the over-current protecting element is breaker.
CN201820861805.9U 2018-06-05 2018-06-05 A kind of AC power source surge protective device and electronic equipment Active CN208508516U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108493913A (en) * 2018-06-05 2018-09-04 深圳市槟城电子有限公司 A kind of AC power surge protective device and electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108493913A (en) * 2018-06-05 2018-09-04 深圳市槟城电子有限公司 A kind of AC power surge protective device and electronic equipment

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