CN105610125A - Overtemperature protection circuit of network equipment - Google Patents
Overtemperature protection circuit of network equipment Download PDFInfo
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- CN105610125A CN105610125A CN201510990639.3A CN201510990639A CN105610125A CN 105610125 A CN105610125 A CN 105610125A CN 201510990639 A CN201510990639 A CN 201510990639A CN 105610125 A CN105610125 A CN 105610125A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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Abstract
The invention relates to an overtemperature protection circuit of network equipment, which is connected between the network equipment and a power adapter. The overtemperature protection circuit of the network equipment comprises a temperature sampling trigger module, a self-locking module and a power switch module, wherein the temperature sampling trigger module is used for collecting a temperature signal of the network equipment and according to the temperature signal, outputting a digital control signal which changes same as the temperature signal; the self-locking module is used for outputting a break-over voltage when the digital control signal rises up to a critical value and begins to drop from the critical value; the power switch module is used for cutting off a power supply circuit, which supplies power to the network equipment through the power adapter, according to the break-over voltage. The overtemperature protection circuit of the network equipment can automatically control the network equipment to stop operation; moreover, after the temperature drops, the overtemperature protection circuit still can keep the network equipment from operating, so as to avoid the occurrence of a danger caused by the accumulation of heat; therefore, the overtemperature protection circuit provides overtemperature protection for the network equipment, thereby prolonging the service life of the network equipment.
Description
Technical field
The present invention relates to network equipment technical field, particularly relate to a kind of network equipment overheating protection circuit.
Background technology
Along with the development of development of Mobile Internet technology, people are more and more stronger to the demand of network. For the ease of peopleUse, add the network equipment of various intellectualized technologies to obtain application more and more widely. For example: wirelessAP (AccessPoint, access node) equipment, can will use wireless device (mobile phone, notebook electricityBrain etc.) user enter the access point of cable network, be mainly used in broadband home, inside, building, campusPortion, inside, garden and warehouse, factory etc. need the place of wireless monitor; ONU (OpticalNetworkUnit,Optical network unit) equipment, be the user side equipment of GEPON (Gigabit Passive Optical Network) system, pass through PONThe business that (passive optical-fiber network) sends from OLT (optical line terminal) for termination, coordinates with OLT,ONU can provide various broadband services to connected user; PLC (PowerLineCommunication, electricityLine of force communication) equipment, by utilizing the power line of transmission current as communications carrier, make PLC equipment toolThere is great convenience, need only in room any place that has supply socket, need not dial, just can enjoy immediatelyAccessed by the express network of 4.5～45Mbps, browse Wang Ye ﹑ and call, and watch online film, fromShuo Ju ﹑ Yu Yin ﹑ video and realize Ji, and electric power is in " four networks one platform " of one.
But, along with network number of users day by day to increase, be additional to function on the network equipment day by day variousChange, make network equipment overwork for a long time under the environment of large electric current or large power consumption conventionally, cause heatingThe significantly rising of amount, therefore the operating temperature of the network equipment can raise gradually. When operating temperature is too high or heatAccumulate when too much, can burn out the network equipment, thereby shorten the service life of the network equipment, serious wordsEven there will be the potential safety hazards such as fire. Therefore, the overtemperature protection measure of the network equipment becomes reliability designA main focus.
Summary of the invention
Based on this, for the problem of how network equipment being carried out to overtemperature protection, the invention provides a kind of networkApparatus overheat holding circuit, can carry out overtemperature protection to the network equipment, thereby extends the use of the network equipmentLife-span.
A kind of network equipment overheating protection circuit, is applied in the network equipment, and the described network equipment is by electricitySource adapter connect alternating current, described network equipment overheating protection circuit be connected in the described network equipment with described inBetween power supply adaptor, and described network equipment overheating protection circuit comprises: temperature sampling trigger module, fromLock module, power switching module;
Described temperature sampling trigger module is used for gathering the temperature signal of the described network equipment, and according to described temperatureThe output of degree signal changes consistent digital controlled signal with described temperature signal; Described self-locking module is used in instituteState after digital controlled signal is increased to critical value and export conducting voltage, the value of described conducting voltage and described power supplyThe output voltage of adapter is identical, and described self-locking module is also for facing from described at described digital controlled signalDividing value is still exported described conducting voltage after starting to decline; Described power switching module, leads for described in basisThe power supply circuits that the disconnected described power supply adaptor of energising crush-cutting provides to the described network equipment.
In an embodiment, described network equipment overheating protection circuit also comprises condition prompting module therein,And described condition prompting module is for the state that breaks down according to described conducting voltage prompting user.
In an embodiment, described temperature sampling trigger module comprises that temperature sampling unit and numeral turn thereinChange unit; Described temperature sampling unit, for gathering the temperature signal of the described network equipment; Described numeral turnsChange unit, for changing consistent digital controlled signal according to described temperature signal output with described temperature signal.
In an embodiment, described temperature sampling unit comprises: resistance R 11, negative temperature coefficient heat-sensitive thereinResistance R 8, resistance R 10 and resistance R 9;
One end of described resistance R 11 is connected with the output of described power supply adaptor, described resistance R 11 anotherOne end is connected with the first input end of described digital translation unit, one end of described resistance R 10 respectively; DescribedThe other end ground connection of resistance R 10; One end of described negative tempperature coefficient thermistor R8 and described power supply adaptorOutput connect, the other end of described negative tempperature coefficient thermistor R8 respectively with described digital translation unitOne end of the second input, described resistance R 9 connect; The other end ground connection of described resistance R 9.
In an embodiment, described digital translation unit comprises therein: resistance R 18, comparator U4, electricityResistance R19 and capacitor C 7;
The normal phase input end of described comparator U4 respectively with one end, the described resistance R 19 of described resistance R 18One end connect, the other end of described resistance R 18 be connected in described negative tempperature coefficient thermistor R8 with described inBetween resistance R 9; The inverting input of described comparator U4 be connected in described resistance R 11 and resistance R 10 itBetween; The first power end of described comparator U4 is respectively with the output of described power supply adaptor, capacitor C 7One end connects, the other end ground connection of described capacitor C 7; The second source end ground connection of described comparator U4, instituteThe output of stating comparator U4 connects with the input of the other end of described resistance R 19, described self-locking module respectivelyConnect.
In an embodiment, described self-locking module comprises therein: diode D6, resistance R 12, capacitor C 9,Resistance R 16, triode Q15, resistance R 15, resistance R 118, resistance R 17, triode Q16, two utmost pointsPipe D7 and capacitor C 8;
The positive pole of described diode D6 is connected with the output of described temperature sampling trigger module, described diodeThe negative pole of D6 is connected with one end of described resistance R 12; The base stage of described triode Q15 respectively with described resistanceOne end of the other end of R12, one end of capacitor C 9, resistance R 16, one end of resistance R 118 connect, instituteEmitter stage, the other end of described capacitor C 9 and the other end of described resistance R 16 of stating triode Q15 all connectGround, the colelctor electrode of described triode Q15 is connected with one end of described resistance R 15; Described triode Q16'sColelctor electrode is connected with the other end of described resistance R 118, the positive pole of diode D7 respectively, described diode D7Negative pole respectively with the input of the input of described power switching module, described condition prompting module and described inOne end of capacitor C 8 connect or the negative pole of described diode D7 respectively with the input of described power switching module,One end of described capacitor C 8 connects, the other end ground connection of described capacitor C 8, the base stage of described triode Q16Be connected with the other end of described resistance R 15, one end of described resistance R 17 respectively, described triode Q16'sEmitter stage is connected with the other end of described resistance R 17, the output of described power supply adaptor respectively.
Therein in an embodiment, described triode Q15, triode Q16 be respectively NPN triode,PNP triode.
In an embodiment, described power switching module comprises therein: metal-oxide-semiconductor Q14, resistance R 22,Resistance R 14 and capacitor C 131;
The drain electrode of described metal-oxide-semiconductor Q14 respectively with power input, the described capacitor C 131 of the described network equipmentOne end connect, the other end ground connection of described capacitor C 131; The source electrode of described metal-oxide-semiconductor Q14 and described electricityThe output of source adapter connects; The grid of described metal-oxide-semiconductor Q14 respectively with one end of described resistance R 22,One end of described resistance R 14 connects, the other end ground connection of described resistance R 14, another of described resistance R 22End is connected with the output of described self-locking module.
In an embodiment, described metal-oxide-semiconductor Q14 is P-channel enhancement type metal-oxide-semiconductor therein.
In an embodiment, described condition prompting module comprises Light-Emitting Diode LED2 and resistance thereinR956; The positive pole of described LED 2 is connected with the output of described self-locking module, described luminousThe negative pole of diode (LED) 2 is connected with one end of described resistance R 956, another termination of described resistance R 956Ground.
The beneficial effect that above-mentioned network equipment overheating protection circuit has is: in this network equipment overtemperature protectionIn circuit, carry out the temperature signal of collection network equipment by temperature sampling trigger module, and according to this temperature letterNumber output change consistent digital controlled signal with this temperature signal. When digital controlled signal is increased to critical valueTime (be also just equivalent to said temperature signal and be elevated to corresponding critical value), self-locking module turn-on power switch module,The circuit that can cut off the electricity supply between adapter and the network equipment by power switching module afterwards, thus makeObtain the network equipment out of service. Meanwhile, self-locking module starts to decline from above-mentioned critical value at digital controlled signalAfter turn-on power switch module still, thereby even if ensure that the network equipment still keeps stopping after temperature declinesRunning status, thus the situation of causing danger because of accumulation of heat avoided. Therefore, this network equipment is overheatedHolding circuit can be carried out overtemperature protection to the network equipment, thereby extends the service life of the network equipment.
Brief description of the drawings
Fig. 1 is the composition structure chart of the network equipment overheating protection circuit of an embodiment.
Fig. 2 is the circuit theory diagrams of network equipment overheating protection circuit embodiment illustrated in fig. 1.
Detailed description of the invention
For clearer explanation network equipment overheating protection circuit provided by the invention, below in conjunction with embodimentMake specific description. Fig. 1 is the composition structure chart of the network equipment overheating protection circuit of an embodiment. Fig. 2For the circuit theory diagrams of network equipment overheating protection circuit embodiment illustrated in fig. 1.
As shown in Figure 1, under normal conditions, the network equipment 300 is connected and is exchanged by power supply adaptor 200Electricity, the power input of the network equipment 300 is connected with the output of power supply adaptor 200, wherein, electricitySource adapter 200 is for being converted to alternating current in the direct current of 12V. In the present embodiment, for to networkEquipment 300 carries out overtemperature protection, is provided with network and establishes between the network equipment 300 and power supply adaptor 200Standby overheating protection circuit 100. Wherein, the dc source needing in network equipment overheating protection circuit 100 is sameThe direct current of being exported by power supply adaptor 200 provides.
Network equipment overheating protection circuit 100 comprises: temperature sampling trigger module 110, self-locking module 120,Power switching module 130 and condition prompting module 140.
Temperature sampling trigger module 110, for the temperature signal of collection network equipment 300, and according to this temperatureSignal output changes consistent digital controlled signal with temperature signal, finally this digital controlled signal is sent toIn self-locking module 120. Concrete, temperature sampling trigger module 110 comprises temperature sampling unit 111 and numeralConverting unit 112.
Temperature sampling unit 111, for the temperature signal of collection network equipment 300, and passes this temperature signalDeliver in digital translation unit 112. Concrete, as shown in Figure 2, temperature sampling unit 111 comprises: resistanceR11, negative tempperature coefficient thermistor R8, resistance R 10 and resistance R 9.
Wherein, one end of resistance R 11 is connected with the output of power supply adaptor 200, another of resistance R 11End is connected with the first input end of digital translation unit 112, one end of resistance R 10 respectively; Resistance R 10Other end ground connection; One end of negative tempperature coefficient thermistor R8 is connected with the output of power supply adaptor 200,The other end of negative tempperature coefficient thermistor R8 respectively with the second input, the resistance of digital translation unit 112One end of R9 connects; The other end ground connection of resistance R 9.
This temperature sampling unit 111 carrys out the temperature of Sampling network equipment 300 by negative tempperature coefficient thermistor R8Degree, and temperature sampling unit 111 is defeated to first input end and second input of digital translation unit 112 respectivelyGo out two-way voltage signal.
Wherein, temperature sampling unit 111 is electricity to the voltage of the second input input of digital translation unit 112The dividing potential drop of resistance R9, because negative tempperature coefficient thermistor R8 is in the time that temperature is higher, resistance value is lower, thereforeWhen the temperature of the network equipment 300 raises, the resistance of negative tempperature coefficient thermistor R8 can decline gradually, thatThe voltage of the resistance R 9 of connecting with negative tempperature coefficient thermistor R8 can raise gradually, digital translation listThe input voltage of the second input of unit 112 is corresponding rising; And temperature sampling unit 111 is to digital translation listThe voltage of the first input end input of unit 112 is the voltage of resistance R 10, due to resistance R 11 and resistance R 10Be constant resistance, therefore the input voltage of the first input end of digital translation unit 112 will remain unchanged. ItsIn, because the input voltage of the second input and the temperature of the network equipment 300 of digital translation unit 112 becomeChanging into direct ratio, is therefore that the input voltage of the second input of digital convertible unit 112 is thought temperature letterNumber.
Digital translation unit 112, for according to said temperature signal, output changes consistent number with this temperature signalWord control signal, and this digital controlled signal is sent in self-locking module 120. Concrete, digital translationUnit 112 resistance R 18, comparator U4, resistance R 19 and capacitor C 7.
Wherein, the normal phase input end of comparator U4 respectively with one end of resistance R 18, one end of resistance R 19Connect, the other end of resistance R 18 is connected between negative tempperature coefficient thermistor R8 and resistance R 9; RelativelyThe inverting input of device U4 is connected between resistance R 11 and resistance R 10; The first power end of comparator U4Be connected respectively the other end ground connection of capacitor C 7 with the output of power supply adaptor 200, one end of capacitor C 7;The second source end ground connection of comparator U4, the output of comparator U4 respectively with the other end of resistance R 19,The input of self-locking module 120 connects.
Above-mentioned digital translation unit 112 has two inputs, is respectively the other end, the comparison of resistance R 18The inverting input of device U4. Wherein, the other end of resistance R 18 is of above-mentioned digital translation unit 112Two inputs, and the inverting input of comparator U4 is the first input end of above-mentioned digital translation unit 112.If the input voltage of the normal phase input end of comparator U4 is greater than the input voltage of inverting input, digital translationHigh level is exported in unit 112, otherwise, output low level. Meanwhile, because the positive of comparator U4 is inputtedThe input voltage of end is consistent with the variation of temperature signal, and therefore, digital translation unit 112 is by arranging comparisonDevice U4, the temperature signal that temperature sampling unit 111 can be gathered is converted to and changes consistent with this temperature signalDigital controlled signal.
Be understandable that, temperature sampling unit 111 and digital translation unit 112 are not limited to above-mentioned situation, onlyMake the temperature signal that temperature sampling trigger module 110 can collection network equipment 300, and according to this temperatureThe output of degree signal changes consistent digital controlled signal with temperature signal. For example,, if by negative temperature coefficientThermistor R8 replaces with semistor, and the other end of resistance R 18 needs to be connected in electricity soBetween resistance R10 and resistance R 11, the inverting input of comparator U4 needs to be connected in positive temperature coefficient heatBetween quick resistance and resistance R 9.
Self-locking module 120 is exported conducting voltage after being increased to critical value at above-mentioned digital controlled signal, shouldThe value of conducting voltage is identical with the output voltage of power supply adaptor 200, and (turn-on voltage is in the present embodiment12V), and self-locking module 120 for start from this critical value at above-mentioned digital controlled signal decline still defeatedGo out above-mentioned conducting voltage. In the present embodiment, critical value is high level and low level boundary voltage, works as numberWord control signal is that digital controlled signal is high level after being increased to critical value, otherwise digital controlled signalFor low level. Concrete, self-locking module 120 comprises diode D6, resistance R 12, capacitor C 9, resistanceR16, triode Q15, resistance R 15, resistance R 118, resistance R 17, triode Q16, diode D7With capacitor C 8.
Wherein, the output of the positive pole of diode D6 and temperature sampling trigger module 110 (in the present embodimentThe output of temperature sampling trigger module 110 is the output of comparator U4) connect, diode D6's is negativeThe utmost point is connected with one end of resistance R 12; The base stage of triode Q15 respectively with the other end, the electric capacity of resistance R 12One end of one end of C9, one end of resistance R 16, resistance R 118 connects, the emitter stage of triode Q15,The equal ground connection of the other end, the colelctor electrode of triode Q15 and the resistance R 15 of the other end of capacitor C 9 and resistance R 16One end connect; The colelctor electrode of triode Q16 respectively with the other end of resistance R 118, diode D7 justThe utmost point connects, the negative pole of diode D7 respectively with input, the condition prompting module of power switching module 130One end of 140 input and capacitor C 8 connects, the other end ground connection of capacitor C 8, the base of triode Q16The utmost point is connected with the other end of resistance R 15, one end of resistance R 17 respectively, and the emitter stage of triode Q16 respectivelyBe connected with the other end of resistance R 17, the output of power supply adaptor 200.
It should be noted that, in the time saving condition prompting module 140 in network equipment overheating protection circuit 100,The negative pole of diode D7 is connected with the input of power switching module 130, one end of capacitor C 8 respectively.
In above-mentioned self-locking module 120, triode Q15 and triode Q16 are all controlled as switch elementThe conducting of interlock circuit processed and disconnection. When after the anodal input high level of diode D6, diode D6 conducting,And then triode Q15 conducting, because the colelctor electrode of triode Q15 is connected with the base stage of triode Q16,Therefore after triode Q15 conducting, triode Q16 is also along with conducting, and at this moment the negative electrode of diode D7 is defeatedGo out the voltage of 12V, i.e. self-locking module 120 is exported conducting voltage. And when the equal conducting of triode Q15, Q16After, even the anodal input low level of diode D6, but because the colelctor electrode of triode Q16 still can be to threeThe base stage of utmost point pipe Q15 continues to provide electric current, and therefore, triode Q16 and triode Q15 are still in conductingState, the negative electrode of diode D7 is still exported the voltage of 12V, i.e. and self-locking module 120 is still exported conductingVoltage.
Concrete, triode Q15, triode Q16 are respectively NPN triode, PNP triode.
Be understandable that, self-locking module 120 is not limited to above-mentioned a kind of situation, as long as can realize upperState after digital controlled signal is increased to critical value and export conducting voltage, and face from this at above-mentioned digital controlled signalDividing value is still exported the function of above-mentioned conducting voltage after starting to decline. For example, if by triode Q15,Triode Q16 replaces with respectively PNP triode, NPN triode, needs above-mentioned self-locking module 120Related circuit be adjusted accordingly so that derive from lock module 120 between triode Q15 and triode Q16Interaction under still can realize above-mentioned functions.
Power switching module 130, cuts off the electricity supply suitable for the conducting voltage of exporting according to above-mentioned self-locking module 120The power supply circuits that orchestration 200 provides to the network equipment 300, quit work the network equipment 300. ToolBody, power switching module 130 comprises metal-oxide-semiconductor Q14, resistance R 22, resistance R 14 and capacitor C 131.
Wherein, the drain electrode of metal-oxide-semiconductor Q14 respectively with power input VSYS, the electric capacity of the network equipment 300One end of C131 connects, the other end ground connection of capacitor C 131; The source electrode of metal-oxide-semiconductor Q14 and power supply adaptor200 output connects; The grid of metal-oxide-semiconductor Q14 respectively with one of one end of resistance R 22, resistance R 14End connects, the other end ground connection of resistance R 14, the output of the other end of resistance R 22 and self-locking module 120Connect (other end of resistance R 22 is connected with the negative electrode of diode D7 in the present embodiment).
In above-mentioned power switching module 130, because metal-oxide-semiconductor can bear larger electric current, therefore selectMetal-oxide-semiconductor Q14 is as switch element. If the input voltage of the other end of resistance R 22 be conducting voltage (12V), metal-oxide-semiconductor Q14 disconnects, and at this moment the power input VSYS of the network equipment 300 and power supply are suitableThe output of orchestration 200 disconnects, thereby has reached the adapter 200 of cutting off the electricity supply to the network equipment 300The object of the power supply circuits that provide.
Concrete, metal-oxide-semiconductor Q14 is P-channel enhancement type metal-oxide-semiconductor.
Be understandable that, the concrete forming circuit of power switching module 130 is not limited to above-mentioned a kind of situation,Cut off the electricity supply adapter 200 to net as long as can realize the conducting voltage of exporting according to above-mentioned self-locking module 120The function of the power supply circuits that network equipment 300 provides, for example, can replace with metal-oxide-semiconductor Q14 P ditchRoad depletion type MOS tube.
Condition prompting module 140, goes out for the conducting voltage prompting user who exports according to above-mentioned self-locking module 120Existing malfunction, when self-locking module 120 is exported after conducting voltage, cuts off electricity at power switching module 130When power supply circuits that source adapter 200 provides to the network equipment 300, also by condition prompting module 140The prompting user state that breaks down so that the information that breaks down of the timely aware networks equipment 300 of user,Thereby fix a breakdown as early as possible.
Concrete, condition prompting module 140 comprises Light-Emitting Diode LED2 and resistance R 956. Wherein, send outThe positive pole of optical diode LED2 is connected (light-emitting diodes in the present embodiment with the output of self-locking module 120The positive pole of pipe LED2 is connected with the negative electrode of diode D7), the negative pole of LED 2 and resistance R 956One end connect, the other end ground connection of resistance R 956.
In above-mentioned condition prompting module 140, when the negative electrode output conducting voltage of diode D7 is 12V electricityAfter pressure, Light-Emitting Diode LED2 conducting, thus can point out to user the shape that breaks down with luminous formState. Therefore, this condition prompting module 140 implements simply, and has higher identification, is convenient to useFamily identification.
Be understandable that, the concrete built-up circuit of condition prompting module 140 is not limited to above-mentioned a kind of situation,For example, as long as can realize the function of pointing out user to break down state according to above-mentioned conducting voltage, selectTransistor amplifier and loudspeaker, when the electric current of diode D7 output enters loudspeaker through transistor amplifierAfter, can point out alarm condition by loudspeaker.
As shown in Figure 2, in the present embodiment, the operation principle of network equipment overheating protection circuit 100 is:After the temperature of the network equipment 300 raises, the resistance of negative tempperature coefficient thermistor R8 constantly reduces, soThe input voltage of comparator U4 normal phase input end raises gradually, due to the input of comparator U4 negative-phase inputVoltage is constant, and the input voltage of therefore working as the normal phase input end of comparator U4 is greater than the input electricity of negative-phase inputAfter pressure, the output output high level of comparator U4. Diode D6 conducting afterwards, triode Q15, threeUtmost point pipe Q16 conducting in succession, the negative electrode output 12V voltage of diode D7. Finally, metal-oxide-semiconductor Q14 disconnects,And then having disconnected the circuit between the network equipment 300 and power supply adaptor 200, the network equipment 300 stops workDo; Light-Emitting Diode LED2 conducting simultaneously, thus point out to user the state that breaks down.
And after the temperature of the network equipment 300 declines, although comparator U4 output low level, diode D6Disconnect, but due to the interaction relationship of triode Q16 and triode Q15, therefore triode Q16, threeUtmost point pipe Q15, diode D7 still keep conducting state, simultaneously power switching module 130, condition prompting mouldDuty before piece 140 still keeps, even if the guarantee network equipment 300 is still protected after temperature declinesHold run-stopping status, thereby avoided the situation of causing danger because of accumulation of heat.
Be understandable that, the condition prompting module 140 in network equipment overheating protection circuit 100 is at otherIn situation, also can omit, if the state after for example network equipment 300 quits work and its state in workCompare obvious difference, at this moment without condition prompting module 140 is set, and only need pass through power switch mouldCircuit between piece 130 disconnect network devices 300 and power supply adaptor 200, user can establish by networkMalfunction is learnt in the variation of standby 300 states.
In addition, when after the trouble shooting of the network equipment 300, recover power supply adaptor 200 if want network is establishedStandby 300 normal power supply, can first control power supply adaptor 200 and stop incoming transport electricity, heavy more afterwardsNewly by power supply adaptor 200 incoming transport electricity, can recover power supply adaptor 200 to the network equipment 300Normal power supply.
In sum, the network equipment overheating protection circuit 100 that the present embodiment provides, at the network equipment 300After temperature raises, the circuit between disconnect network devices 300 and power supply adaptor 200, makes net automaticallyNetwork equipment 300 is out of service. This network equipment overheating protection circuit 100 is in the temperature of the network equipment 300 simultaneouslyDegree still can make the network equipment 300 keep state out of service, to avoid because of accumulation of heat after decliningAnd the situation of causing danger. Therefore, this network equipment overheating protection circuit 100 can be to the network equipment 300Carry out overtemperature protection, thereby extended the service life of the network equipment 300.
Each technical characterictic of the above embodiment can combine arbitrarily, for making to describe succinctly, not rightThe all possible combination of each technical characterictic in above-described embodiment is all described, but, as long as these skillsThere is not contradiction in the combination of art feature, is all considered to be the scope that this description is recorded.
Above embodiment has only expressed several embodiment of the present invention, and its description is comparatively concrete, but can notTherefore be construed as limiting the scope of the patent. Be to be noted that the ordinary skill people for this areaMember, without departing from the inventive concept of the premise, can also make some distortion and improvement, and these allBelong to protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a network equipment overheating protection circuit, is applied in the network equipment, and the described network equipment passes throughPower supply adaptor connects alternating current, it is characterized in that, described in described network equipment overheating protection circuit is connected inBetween the network equipment and described power supply adaptor, and described network equipment overheating protection circuit comprises: temperature is adoptedSample trigger module, self-locking module, power switching module;
Described temperature sampling trigger module is used for gathering the temperature signal of the described network equipment, and according to described temperatureThe output of degree signal changes consistent digital controlled signal with described temperature signal; Described self-locking module is used in instituteState after digital controlled signal is increased to critical value and export conducting voltage, the value of described conducting voltage and described power supplyThe output voltage of adapter is identical, and described self-locking module is also for facing from described at described digital controlled signalDividing value is still exported described conducting voltage after starting to decline; Described power switching module, leads for described in basisThe power supply circuits that the disconnected described power supply adaptor of energising crush-cutting provides to the described network equipment.
2. network equipment overheating protection circuit according to claim 1, is characterized in that, described networkApparatus overheat holding circuit also comprises condition prompting module, and described condition prompting module is led described in basisThe prompting user state that breaks down is pressed in energising.
3. network equipment overheating protection circuit according to claim 1 and 2, is characterized in that, described inTemperature sampling trigger module comprises temperature sampling unit and digital translation unit; Described temperature sampling unit, usesIn the temperature signal that gathers the described network equipment; Described digital translation unit, for according to described temperature signalOutput changes consistent digital controlled signal with described temperature signal.
4. network equipment overheating protection circuit according to claim 3, is characterized in that, described temperatureSampling unit comprises: resistance R 11, negative tempperature coefficient thermistor R8, resistance R 10 and resistance R 9;
One end of described resistance R 11 is connected with the output of described power supply adaptor, described resistance R 11 anotherOne end is connected with the first input end of described digital translation unit, one end of described resistance R 10 respectively; DescribedThe other end ground connection of resistance R 10; One end of described negative tempperature coefficient thermistor R8 and described power supply adaptorOutput connect, the other end of described negative tempperature coefficient thermistor R8 respectively with described digital translation unitOne end of the second input, described resistance R 9 connect; The other end ground connection of described resistance R 9.
5. network equipment overheating protection circuit according to claim 4, is characterized in that, described numeralConverting unit comprises: resistance R 18, comparator U4, resistance R 19 and capacitor C 7;
The normal phase input end of described comparator U4 respectively with one end, the described resistance R 19 of described resistance R 18One end connect, the other end of described resistance R 18 be connected in described negative tempperature coefficient thermistor R8 with described inBetween resistance R 9; The inverting input of described comparator U4 be connected in described resistance R 11 and resistance R 10 itBetween; The first power end of described comparator U4 is respectively with the output of described power supply adaptor, capacitor C 7One end connects, the other end ground connection of described capacitor C 7; The second source end ground connection of described comparator U4, instituteThe output of stating comparator U4 connects with the input of the other end of described resistance R 19, described self-locking module respectivelyConnect.
6. network equipment overheating protection circuit according to claim 1 and 2, is characterized in that, described inSelf-locking module comprises: diode D6, resistance R 12, capacitor C 9, resistance R 16, triode Q15, resistanceR15, resistance R 118, resistance R 17, triode Q16, diode D7 and capacitor C 8;
The positive pole of described diode D6 is connected with the output of described temperature sampling trigger module, described diodeThe negative pole of D6 is connected with one end of described resistance R 12; The base stage of described triode Q15 respectively with described resistanceOne end of the other end of R12, one end of capacitor C 9, resistance R 16, one end of resistance R 118 connect, instituteEmitter stage, the other end of described capacitor C 9 and the other end of described resistance R 16 of stating triode Q15 all connectGround, the colelctor electrode of described triode Q15 is connected with one end of described resistance R 15; Described triode Q16'sColelctor electrode is connected with the other end of described resistance R 118, the positive pole of diode D7 respectively, described diode D7Negative pole respectively with the input of the input of described power switching module, described condition prompting module and described inOne end of capacitor C 8 connect or the negative pole of described diode D7 respectively with the input of described power switching module,One end of described capacitor C 8 connects, the other end ground connection of described capacitor C 8, the base stage of described triode Q16Be connected with the other end of described resistance R 15, one end of described resistance R 17 respectively, described triode Q16'sEmitter stage is connected with the other end of described resistance R 17, the output of described power supply adaptor respectively.
7. network equipment overheating protection circuit according to claim 6, is characterized in that, described three utmost pointsPipe Q15, triode Q16 are respectively NPN triode, PNP triode.
8. network equipment overheating protection circuit according to claim 1 and 2, is characterized in that, described inPower switching module comprises: metal-oxide-semiconductor Q14, resistance R 22, resistance R 14 and capacitor C 131;
The drain electrode of described metal-oxide-semiconductor Q14 respectively with power input, the described capacitor C 131 of the described network equipmentOne end connect, the other end ground connection of described capacitor C 131; The source electrode of described metal-oxide-semiconductor Q14 and described electricityThe output of source adapter connects; The grid of described metal-oxide-semiconductor Q14 respectively with one end of described resistance R 22,One end of described resistance R 14 connects, the other end ground connection of described resistance R 14, another of described resistance R 22End is connected with the output of described self-locking module.
9. network equipment overheating protection circuit according to claim 8, is characterized in that, described MOSPipe Q14 is P-channel enhancement type metal-oxide-semiconductor.
10. network equipment overheating protection circuit according to claim 2, is characterized in that, described shapeState reminding module comprises Light-Emitting Diode LED2 and resistance R 956; The positive pole of described LED 2Be connected the negative pole of described LED 2 and described resistance R 956 with the output of described self-locking moduleOne end connect, the other end ground connection of described resistance R 956.
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