CN102801536B - Network communication equipment - Google Patents
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- CN102801536B CN102801536B CN201110141645.3A CN201110141645A CN102801536B CN 102801536 B CN102801536 B CN 102801536B CN 201110141645 A CN201110141645 A CN 201110141645A CN 102801536 B CN102801536 B CN 102801536B
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Abstract
The invention discloses network communication equipment, which is used for generating a dying gasp signal. The network communication equipment comprises a voltage sensing circuit, a charging and discharging circuit, a power supply circuit, a central processing unit, a subsystem circuit, an overheat sensing circuit and an overheat protection circuit, wherein the voltage sensing circuit senses the voltage of an external power supply; the central processing unit comprises a dying gasp sensing pin, and is connected with the voltage sensing circuit to obtain the sensed voltage, judge whether the external power supply is cut off or not according to the sensed voltage and generate the dying gasp signal when the external power supply is cut off; the overheat sensing circuit senses whether the network communication equipment is overheated or not; and the overheat protection circuit switches off the subsystem circuit and the power supply circuit when the network communication equipment is overheated, and enables the central processing unit to generate the dying gasp signal. According to the network communication equipment, the dying gasp signal can be generated under a dying gasp condition and an overheat condition without interference.
Description
Technical field
The present invention relates to network service, particularly a kind of network equipment that produces power-off signal.
Background technology
Producing power-off signal (dying gasp) is the basic demand of digital user loop (XDSL) equipment, this action makes local side manager can know that terminal use is own power-off shutdown or causes broken string because of line quality problem, to facilitate the local side manager line inspection and customer service.In recent years, because of the requirement of terminal use to miniaturization of electronic products, the shell of digital user loop equipment does less and less.Meanwhile, because terminal use usually can not pull out the power supply of digital user loop equipment, make digital user loop equipment easily overheated under long-time use, severe patient causes digital user loop device housings to melt distortion.Thereby, conventionally in digital user loop equipment, add overheat protective function.But present overheat protective function is common and produce power-off signal onrelevant, this causes local side manager erroneous judgement.
Summary of the invention
In view of this, need provide a kind of network communication equipment, under power-off and overheat condition, all can produce power-off signal.
A kind of network communication equipment, for generation of power-off signal and be sent to local side apparatus, comprises voltage detection circuit, charge-discharge circuit, power supply circuits, central processing unit, subsystem circuit, overheated circuit for detecting and overheating protection circuit.Voltage detection circuit connects external power source, for detecting the voltage of described external power source.Charge-discharge circuit connects described external power source, for charging in the time that described external power source is worked, and electric discharge in the time that described external power source disconnects.Power supply circuits connect described charge-discharge circuit, for input voltage being converted to multiple output voltages, are described network communication equipment power supply.Central processing unit connects described voltage detection circuit and described power supply circuits, comprises power-off detecting pin, and described power-off detecting pin connects described voltage detection circuit to obtain described detecting voltage.Described central processing unit is used for controlling the work of described network communication equipment, and judges according to described detecting voltage whether described external power source disconnects, and produces power-off signal in the time that described external power source disconnects.Subsystem circuit connects described central processing unit and described power supply circuits, for carrying out work according to the control of described central processing unit.Whether overheated circuit for detecting is used for detecting described network communication equipment overheated.Overheating protection circuit connects the power-off detecting pin of described overheated circuit for detecting and central processing unit, in the time that described network communication equipment is overheated, turn-offs described subsystem circuit and described power supply circuits, and makes described central processing unit produce power-off signal.Described overheating protection circuit comprises the first switch element, second switch element and the first electric capacity.The first switch element comprises controls the utmost point, the first electrode and the second electrode, and described the first electrode connects described power-off detecting pin, and described the second electrode is via the first grounding through resistance, and the described control utmost point connects described overheated circuit for detecting via the second resistance.Second switch element comprises controls the utmost point, the first electrode and the second electrode, the control utmost point of described second switch element connects the control utmost point of described the first switch element and connects described subsystem circuit via described the second resistance, the first electrode of described second switch element receives the first voltage, and the second electrode of described second switch element is via the 3rd grounding through resistance and connect described power supply circuits.The first electric capacity is in parallel with described the 3rd resistance.
Preferably, described overheating protection circuit also comprises the 4th resistance, is connected between the control utmost point and ground of described the first switch element.
Preferably, described one of output voltage that waits that described the first voltage is described power supply circuits.
Preferably, described voltage detection circuit comprises the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance.Described the 5th resistance and described the 6th resistance are series between described external power source and ground.Described the 7th resistance and described the 8th resistance are series between described the 5th resistance and the tie point and ground of described the 6th resistance, and described the 7th resistance is connected the power-off detecting pin of described central processing unit with the tie point of described the 8th resistance.
Preferably, described charge-discharge circuit comprises thermistor, diode and at least one the second electric capacity.Thermistor one end connects described external power source.The other end of thermistor described in the anodic bonding of diode, negative electrode connects described power supply circuits.At least one the second electric capacity is connected between the negative electrode and ground of described diode.
Preferably, described power supply circuits comprise pressurizer and multiple power transfer module.Described pressurizer comprises input and output, and described input connects described charge-discharge circuit, and described output is exported the first output voltage, is described overheated circuit for detecting and the power supply of described overheating protection circuit.The power transfer module such as described comprises first input end, the second input and output; the first input end of the power transfer module such as described connects described charge-discharge circuit; the second input of the power transfer module such as described connects the second electrode of the second switch element of described overheating protection circuit; the output of the power transfer module such as described is exported multiple the second output voltages, is described central processing unit and the power supply of described subsystem circuit.
Preferably, described subsystem circuit comprise first with door and subsystem element.First comprises first input end, the second input and output with door, and described first is connected described central processing unit with the first input end of door, and described first is connected the control utmost point of the second switch element of described overheating protection circuit with the second input of door.Subsystem element connects one of power transfer module such as described, by power supply such as one of described second output voltage such as grade, and connect described first with the output of door.
Preferably, described subsystem circuit also comprise second with door and USB power subsystem.Second comprises first input end, the second input and output with door, and described second is connected described voltage detection circuit with the first input end of door, and described second is connected the control utmost point of the second switch element of described overheating protection circuit with the second input of door.USB power subsystem connect described second with the output of door, for according to described second with the control of door, be external USB client power supply.
A kind of network communication equipment, for generation of power-off signal and be sent to local side apparatus, comprises voltage detection circuit, charge-discharge circuit, power supply circuits, central processing unit, subsystem circuit, overheated circuit for detecting and overheating protection circuit.Voltage detection circuit connects external power source, for detecting the voltage of described external power source.
Charge-discharge circuit connects described external power source, for charging in the time that described external power source is worked, and electric discharge in the time that described external power source disconnects.Power supply circuits connect described charge-discharge circuit, for described external power source is converted to multiple output voltages, are described network communication equipment power supply.Central processing unit connects described voltage detection circuit and described power supply circuits, comprise power-off detecting pin, described power-off detecting pin connects described voltage detection circuit to obtain described detecting voltage, described central processing unit is used for judging according to described detecting voltage whether described external power source disconnects, and produces power-off signal in the time that described external power source disconnects.Subsystem circuit connects described central processing unit and described power supply circuits, for carrying out work according to the control of described central processing unit.Whether overheated circuit for detecting is used for detecting described network communication equipment overheated.Overheating protection circuit connects the power-off detecting pin of described overheated circuit for detecting and central processing unit; for in the time that described network communication equipment is overheated; change the voltage of described power-off detecting pin; so that described central processing unit produces power-off signal, and turn-off described subsystem circuit and described power supply circuits.
Preferably, described overheating protection circuit comprises the first switch element, second switch element and the first electric capacity.The first switch element comprises controls the utmost point, the first electrode and the second electrode, and described the first electrode connects described power-off detecting pin, and described the second electrode is via the first grounding through resistance, and the described control utmost point connects described overheated circuit for detecting via the second resistance.Second switch element comprises controls the utmost point, the first electrode and the second electrode, the control utmost point of described second switch element connects the control utmost point of described the first switch element and connects described subsystem circuit via described the second resistance, the first electrode of described second switch element receives the first voltage, and the second electrode of described second switch element is via the 3rd grounding through resistance and connect described power supply circuits.The first electric capacity is in parallel with described the 3rd resistance.
Above-mentioned network communication equipment combines power-off detecting with overtemperature protection, all can produce power-off signal and can not interfere with each other under power-off and overheat condition.
Brief description of the drawings
Fig. 1 is the schematic diagram of network communication equipment in an embodiment of the present invention;
Fig. 2 is the circuit diagram of the overheating protection circuit of network communication equipment in first embodiment of the invention;
Fig. 3 is the circuit diagram of the overheating protection circuit of network communication equipment in second embodiment of the invention;
Fig. 4 is the physical circuit figure of network communication equipment in an embodiment of the present invention; And
Fig. 5 is the physical circuit figure of network communication equipment in another execution mode of the present invention.
Main element symbol description
Network communication equipment 10
Voltage detection circuit 100
Charge-discharge circuit 110
Power supply circuits 120
Pressurizer 1200
Power transfer module 1210
Central processing unit 130
Subsystem circuit 140,140A, 140B
First with door a G1
Second with door a G2
Subsystem element 1400
USB power subsystem 1410
Overheated circuit for detecting 150
Overheating protection circuit 160,160A, 160B
The first switch element Q1
Second switch element Q2
First to fourth capacitor C 1, C2, C3, C4
First to the 8th resistance R 1～R8
Thermistor NTC
Diode D1
The first voltage V
The first output voltage V 1
The second output voltage V 2
External power source Vin
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Fig. 1 is the schematic diagram of network communication equipment 10 in an embodiment of the present invention.In the present embodiment, network communication equipment 10 is digital user loop equipment, for generation of power-off signal and be sent to local side apparatus.Network communication equipment 10 comprises voltage detection circuit 100, charge-discharge circuit 110, power supply circuits 120, central processing unit 130, subsystem circuit 140, overheated circuit for detecting 150 and overheating protection circuit 160.Voltage detection circuit 100 connects external power source Vin, for detecting the voltage of external power source Vin.Charge-discharge circuit 110 connects external power source Vin, for charging in the time that external power source Vin works, and electric discharge in the time that external power source Vin disconnects.
Power supply circuits 120 connect charge-discharge circuit 110, for input voltage being converted to multiple output voltages, for network communication equipment 10 is powered, power in particular for central processing unit 130 and subsystem circuit 140.In the present embodiment, in the time that external power source Vin works, the input voltage of power supply circuits 120 is external power source Vin, and external power source Vin is converted to the described output voltage of Denging by power supply circuits 120.In the time that external power source Vin disconnects, charge-discharge circuit 110 discharges to power supply circuits 120, thinks that power supply circuits 120 provide input voltage.The input voltage difference that central processing unit 130 and subsystem circuit 140 are required, thereby the described output voltage that power supply circuits 120 are exported is also different.
Central processing unit 130 connects voltage detection circuit 100 and power supply circuits 120, comprises power-off detecting pin, and described power-off detecting pin connects voltage detection circuit 100, to obtain detecting voltage.Whether central processing unit 130, for controlling the work of network communication equipment 10, for example, sends control signal control subsystem circuit 140 and works.Central processing unit 130 is also for judging according to detecting voltage whether external power source Vin disconnects, and in the time that disconnecting, external power source Vin produces power-off signal, to be sent to local side apparatus, make local side apparatus know network communication equipment 10 power-off, avoid local side apparatus erroneous judgement line quality.Subsystem circuit 140 connects central processing unit 130 and power supply circuits 120, for carrying out work according to the control of central processing unit 130.
Whether overheated circuit for detecting 150 is overheated for detecting network communication equipment 10.Overheated circuit for detecting 150 is powered by the first voltage V, to keep continued power.In the present embodiment, the first voltage V is power supply independently.In another embodiment of the present invention, the first voltage V also can be provided by power supply circuits 120.Overheated circuit for detecting 150 is realized by temperature-sensitive element, and its signal of exporting different voltages under condition of different temperatures is to overheating protection circuit 160.
Overheating protection circuit 160 connects power-off detecting pin, overheated circuit for detecting 150, power supply circuits 120 and the subsystem circuit 140 of central processing unit 130; for in the time that network communication equipment 10 is overheated; change the voltage of the power-off detecting pin of central processing unit 130; so that central processing unit 130 produces power-off signal, and turn-off subsystem circuit 140 and power supply circuits 120.Overheating protection circuit 160 is powered by the first voltage V, to keep continued power.In the present embodiment, the first voltage V is power supply independently.In another embodiment of the present invention, the first voltage V also can be provided by power supply circuits 120.
In the present embodiment, in the time of network communication equipment 10 normal work, charge-discharge circuit 110 charges, and the detecting voltage that voltage detection circuit 100 obtains is high level signal.Thereby central processing unit 130 judges external power source Vin normal power supply according to the detecting voltage of high level, can not produce power-off signal.If now network communication equipment 10 is overheated, it is overheated that overheated circuit for detecting 150 detects, and notifies overheating protection circuit 160.Overheating protection circuit 160 changes the voltage of the power-off detecting pin of central processing unit 130, drags down the voltage of power-off detecting pin, makes central processing unit 130 think external power source Vin power-off, thereby produces power-off signal, notice local side apparatus.Simultaneously; overheating protection circuit 160 slowly turn-offs power supply circuits 120; make power supply circuits 120 provide central processing unit 130 to produce the required necessary electric power of power-off signal; and turn-off immediately subsystem circuit 140; to save the electricity consumption of network communication equipment 10, and avoid that subsystem circuit 140 and power supply circuits 120 continuous firings bring persistently overheating.
In the time of external power source Vin power-off, the detecting voltage that voltage detection circuit 100 detects is about 0, and central processing unit 130 judges external power source Vin power-off according to described detecting voltage.Now, charge-discharge circuit 110 discharges to power supply circuits 120, for power supply circuits 120 provide input voltage, makes it provide necessary output voltage to central processing unit 130, makes central processing unit 130 have enough electric power to produce power-off signal.
Network communication equipment 10 is same when overheated to be produced power-off signal and is sent to local side apparatus, avoids local side manager erroneous judgement.
Figure 2 shows that the physical circuit figure of overheating protection circuit 160A in an embodiment of the present invention.Overheating protection circuit 160A comprises the first switch element Q1, the first resistance R 1, the second resistance R 2, second switch element Q2, the 3rd resistance R 3 and the first capacitor C 1.The first switch element Q1 and second switch element Q2 include and control the utmost point, the first electrode and the second electrode.The first electrode of the first switch element Q1 connects the power-off detecting pin of central processing unit 130, and the second electrode, via the first resistance R 1 ground connection, is controlled the utmost point and connected overheated circuit for detecting 150 via the second resistance R 2.The control utmost point connector circuit system 140, the first electrodes that the control utmost point of second switch element Q2 connects the first switch element Q1 via the second resistance R 2 receive the first voltage V, and the second electrode is via the 3rd resistance R 3 ground connection and connect power supply circuits 120.The first capacitor C 1 is in parallel with the 3rd resistance R 3.
In the present embodiment, the first switch element Q1 is P-type mos field effect transistor (PMOSFET), the control of the first switch element Q1 is the grid of PMOSFET very, the source electrode that the first electrode of the first switch element Q1 is PMOSFET, the drain electrode that the second electrode of the first switch element Q1 is PMOSFET.Second switch element Q2 is the transistor of NPN type, the very base stage of NPN transistor of the control of second switch element Q2, the collector electrode that the first electrode of second switch element Q2 is NPN transistor, the emitter that the second electrode of second switch element Q2 is NPN transistor.The first resistance R 1 is 20Kohm, and the 3rd resistance R 3 is 47Kohm.
In the time of network communication equipment 10 normal work, there is not overheating conditions in the signal notice overheating protection circuit 160A network communication equipment 10 that overheated circuit for detecting 150 produces high level.Now; the first switch element Q1 cut-off; during because of the first switch element Q1 cut-off, there is high-impedance behavior; avoid the dividing potential drop of the power-off detecting pin that affects central processing unit 130; thereby overheating protection circuit 160A can not change the voltage of the power-off detecting pin of central processing unit 130, central processing unit 130 can not produce power-off signal.Second switch element Q2 conducting; thereby the second electrode of second switch element Q2 is high level; the first capacitor C 1 is charged, and the enable signal that overheating protection circuit 160A sends high level is to power supply circuits 120 and subsystem circuit 140, and power supply circuits 120 and subsystem circuit 140 are all normally worked.
In the time that network communication equipment 10 is overheated, it is overheated that overheated circuit for detecting 150 detects, and produces low level signal notice overheating protection circuit 160A.Now, the first switch element Q1 conducting, the first resistance R 1 is detected pin dividing potential drop to the power-off of central processing unit 130, thereby drags down the voltage of power-off detecting pin, makes central processing unit 130 produce power-off signal.Meanwhile, overheating protection circuit 160A sends low level enable signal to subsystem circuit 140, to reduce the power consumption of network communication equipment 10, avoids temperature to continue overheated.Second switch element Q2 cut-off; now the first capacitor C 1 is discharged to the 3rd resistance R 3; be that the enable signal of overheating protection circuit 160A transmission voltage slow decreasing is to power supply circuits 120; make power supply circuits 120 first provide necessary electric power to central processing unit 130; to produce power-off signal, and then turn-off.
Network communication equipment 10 in present embodiment is when overheated, make central processing unit 130 produce power-off signal via the voltage that drags down power-off detecting pin, slowly turn-off power supply circuits 120, it is powered to central processing unit 130, to produce power-off signal, and turn-off immediately subsystem circuit 140, reduce power consumption, power supply circuits 120 are only powered to central processing unit 130, reduce and produce the required time of power-off signal.In addition, because of the existence of the first switch element Q1, power-off detecting and overtemperature protection are isolated mutually, eliminated the interference between power-off detecting and overtemperature protection.
Fig. 3 is the physical circuit figure of overheating protection circuit 160B in another execution mode of the present invention.Overheating protection circuit 160B in present embodiment is that from the different of the overheating protection circuit 160A in Fig. 2 overheating protection circuit 160B also comprises the 4th resistance R 4, and remainder is identical, thereby no longer describes in detail herein.The 4th resistance R 4 is connected between the control utmost point and ground of the first switch element Q1, forms bleeder circuit with the second resistance R 2, to finely tune the voltage of the control utmost point of the first switch element Q1.
Fig. 4 is the physical circuit figure of network communication equipment 10 in an embodiment of the present invention, particularly voltage detection circuit 100, charge-discharge circuit 110, power supply circuits 120 and subsystem circuit 140A.Voltage detection circuit 100 comprises that the 5th resistance R 5 is to the 9th resistance R 9.The 5th resistance R 5 and the 6th resistance R 6 are series between external power source Vin and ground.The 7th resistance R 7 and the 8th resistance R 8 are series between the 5th resistance R 5 and the tie point and ground of the 6th resistance R 5, and the 7th resistance R 7 is connected the power-off detecting pin of central processing unit 130 with the tie point of the 8th resistance R 8.In the present embodiment, the voltage of external power source Vin is 12V, and the 5th resistance R 5 is 47Kohm, and the 6th resistance R 6 is 39Kohm, and the 7th resistance R 7 is 24Kohm, and the 8th resistance R 8 is 20Kohm.Thereby when external power source Vin normal power supply, the voltage of the power-off detecting pin of central processing unit 130 is about 1.67V, the voltage of the tie point of the 5th resistance R 5 and the 6th resistance R 6 is about 3.67V.In the present embodiment, central processing unit 130 can produce power-off signal in power-off detecting pin voltage below 1.25V (fluctuating 2.5%).
Charge-discharge circuit 110 comprises thermistor NTC, diode D1 and at least one the second electric capacity.The quantity of at least one the second electric capacity is set according to the need for electricity of network communication equipment 10, in the present embodiment, it comprises the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 that capacitance parallel with one another is less, avoids using large electric capacity, thereby reduces the thickness of network communication equipment 10.Thermistor NTC is connected between external power source Vin and the anode of diode D1, for prevent external power source Vin open time instantaneous large-current.The negative electrode of the first diode D1 connects power supply circuits 120, and via the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 ground connection parallel with one another.In the present embodiment, thermistor NTC is negative tempperature coefficient thermistor.
In the time of external power source Vin normal power supply, diode D1 conducting, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 are charged, and external power source Vin provides input voltage via thermistor NTC and diode D1 for power supply circuits 120.In the time of external power source Vin power-off, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 are discharged to power supply circuits 120, and now, diode D1 cut-off, prevents that discharging current from refluxing, to avoid electric weight waste.
Power supply circuits 120 comprise pressurizer 1200 and multiple power transfer module 1210 (only illustrating).Pressurizer 1200 comprises input and output; its input connects the negative electrode of the diode D1 of charge-discharge circuit 110; output is exported the first output voltage V 1, is overheated circuit for detecting 150 and overheating protection circuit 160,160A, 160B power supply, and the first voltage V is the first output voltage V 1.In the present embodiment, the first output voltage V 1 is 5V.Described power transfer module 1210 comprises first input end, the second input and output; its first input end connects the negative electrode of the diode D1 of charge-discharge circuit 110; the second input connects the second electrode of the second switch element Q2 of overheating protection circuit 160A, 160B; output is exported multiple the second output voltage V 2; for example; the voltage of 3.3V, 1.8V and 1.2V is central processing unit 130 and subsystem circuit 140A power supply.
Subsystem circuit 140A comprise first with door G1 and subsystem element 1400.First comprises first input end, the second input and output with door G1; its first input end connects central processing unit 130; for receiving the control signal of central processing unit 130; the second input connects the control utmost point of the second switch element Q2 of overheating protection circuit 160A, 160B; for receiving the enable signal of overheating protection circuit 160A, 160B; output outputs control signals to subsystem element 1400, and whether work control subsystem unit 1400.Subsystem element 1400 is powered by one of described power transfer module 1210.In the present embodiment, when the enable signal that the control signal sending when central processing unit 130 and overheating protection circuit 160A, 160B send out is high level, work in the first control signal control subsystem unit 1400 of just sending high level with door G1.In the time that in the enable signal that control signal that central processing unit 130 sends and overheating protection circuit 160A, 160B send, any is for low level, first sends low level control signal with a door G1, does not work in control subsystem unit 1400.
Fig. 5 is the physical circuit figure of network communication equipment 10 in another execution mode of the present invention, in itself and Fig. 4 the difference of network communication equipment 10 be subsystem circuit 140B also comprise second with door G2 and USB power subsystem 1410, all the other are identical, thereby repeat no more.Second comprises first input end, the second input and output with door G2; second is connected the 5th resistance R 5 of voltage detection circuit 100 and the tie point of the 6th resistance R 5 with the first input end of door G2, and second is connected the control utmost point of the second switch element Q2 of overheating protection circuit 160 with the second input of door G2.USB power subsystem 1410 connect second with the output of door G2, and by one of power transfer module 1210 power supply, for according to second with the control of door G2, be the power supply of external USB client.In the present embodiment; in the time that the tie point voltage of the 5th resistance R 5 and the 6th resistance R 6 and enable signal that overheating protection circuit 160,160A, 160B send out are high level, the second control signal control USB power subsystem 1410 of just sending high level with door G2 is worked.In the time that in the tie point voltage of the 5th resistance R 5 and the 6th resistance R 6 and enable signal that overheating protection circuit 160,160A, 160B send out, any is for low level; second sends low level control signal with door G2; control USB power subsystem 1410 and do not work, thereby stop as the power supply of external USB client.
In the present embodiment; in the time that external power source Vin normally works; external power source Vin is that the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 are charged via thermistor NTC and diode D1; and for pressurizer 1200 and power transfer module 1210 provide input voltage; thereby pressurizer 1200 is exported the first output voltage V 1 to overheated circuit for detecting 150 and overheating protection circuit 160,160A, 160B, and power transfer module 1210 is exported multiple the second output voltage V 2 to central processing unit 130, subsystem element 1400 and USB power subsystem 1410.The now power-off of central processing unit 130 detecting pin voltage is about 1.67V, and central processing unit 130 can not produce power-off signal.The voltage of the 5th resistance R 5 and the 6th resistance R 6 tie points is about 3.67V, is high level signal.Now; network communication equipment 10 is not overheated; thereby generation high level signal; for example; the high level signal notice overheating protection circuit 160 of 3.3V, 160A, 160B; the first switch element Q1 cut-off, second switch element Q2 conducting, the enable signal that overheating protection circuit 160,160A, 160B send high level to power transfer module 1210, first with door G1 and second and a G2.Now, first is high level signal with door G1 and second with the input of G2, thereby all exports high level signal, and subsystem element 1400 and USB supply voltage 1410 are all worked.
If it is overheated that network communication equipment 10 occurs, now still continued power of external power source Vin, thereby the power-off of central processing unit 130 detecting pin voltage is still 1.67V, and the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 still continue charging.It is overheated that overheated circuit for detecting 150 detects, and produces low level signal notice overheating protection circuit 160,160A, 160B, and the control utmost point of the first switch element Q1 and second switch element Q2 is low level.Thereby, the first switch element Q1 conducting, second switch element Q2 cut-off.The first resistance R 1 is in parallel with the 8th resistance R 8, power-off detecting pin voltage is dragged down as 0.98V, thereby central processing unit 130 starts to produce power-off signal.Overheating protection circuit 160,160A, 160B send low level enable signal to the first and door G1 and second with G2; thereby subsystem element 1400 and USB power subsystem 1410 are closed; to reduce power consumption, and it is brought persistently overheating to avoid subsystem element 1400 and USB power subsystem 1410 to work on.Simultaneously; the first capacitor C 1 is discharged to the 3rd resistance R 3; be that overheating protection circuit 160,160A, 160B provide the enable signal of voltage slow decreasing to power transfer module 1210, power transfer module 1210 is turn-offed after providing central processing unit 130 to produce the required electric power of power-off signal.And still continuous firing of pressurizer 1200 is now given overheated circuit for detecting 150 and overheating protection circuit 160,160A, 160B with continued power.In the present embodiment, voltage when the first capacitor C 1 has just started to discharge is 4.8V, and in the time that it is discharged to voltage and is about 0.8V, power transfer module 1210 is turn-offed, and this discharge process maintains about 107ms.
If external power source Vin power-off, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 are discharged, and diode D1 cut-off prevents that discharging current from refluxing.Thereby power-off detecting pin voltage becomes 0 immediately, has reduced the detecting time of central processing unit 130, central processing unit 130 starts to produce power-off signal.The input voltage that power transfer module 1210 utilizes the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 to discharge, continues as central processing unit 130 and powers, and makes it produce power-off signal.
Network communication equipment 10 combines power-off detecting with overtemperature protection, all can produce power-off signal and can not interfere with each other under power-off and overheat condition.
Claims (8)
1. a network communication equipment, for generation of power-off signal and be sent to local side apparatus, is characterized in that, described network communication equipment comprises:
Voltage detection circuit, connects external power source, for detecting the voltage of described external power source;
Charge-discharge circuit, connects described external power source, for charging in the time that described external power source is worked, and electric discharge in the time that described external power source disconnects;
Power supply circuits, connect described charge-discharge circuit, for input voltage being converted to multiple output voltages, are described network communication equipment power supply;
Central processing unit, connect described voltage detection circuit and described power supply circuits, comprise power-off detecting pin, described power-off detecting pin connects described voltage detection circuit to obtain described detecting voltage, described central processing unit is for controlling the work of described network communication equipment, and judge according to described detecting voltage whether described external power source disconnects, and in the time that disconnecting, described external power source produces power-off signal;
Subsystem circuit, connects described central processing unit and described power supply circuits, for carrying out work according to the control of described central processing unit;
Overheated circuit for detecting, whether overheated for detecting described network communication equipment; And
Overheating protection circuit, pin is detected in the power-off that connects described overheated circuit for detecting and central processing unit, in the time that described network communication equipment is overheated, turn-offs described subsystem circuit and described power supply circuits, and makes described central processing unit produce power-off signal, comprising:
The first switch element, comprises and controls the utmost point, the first electrode and the second electrode, and described the first electrode connects described power-off detecting pin, and described the second electrode is via the first grounding through resistance, and the described control utmost point connects described overheated circuit for detecting via the second resistance;
Second switch element, comprise and control the utmost point, the first electrode and the second electrode, the control utmost point of described second switch element connects the control utmost point of described the first switch element and connects described subsystem circuit via described the second resistance, the first electrode of described second switch element receives the first voltage, and the second electrode of described second switch element is via the 3rd grounding through resistance and connect described power supply circuits; And
The first electric capacity, in parallel with described the 3rd resistance.
2. network communication equipment as claimed in claim 1, is characterized in that, described overheating protection circuit also comprises the 4th resistance, is connected between the control utmost point and ground of described the first switch element.
3. network communication equipment as claimed in claim 1, is characterized in that, one of described output voltage that described the first voltage is described power supply circuits.
4. network communication equipment as claimed in claim 1, is characterized in that, described voltage detection circuit comprises:
The 5th resistance;
The 6th resistance, described the 5th resistance and described the 6th resistance are series between described external power source and ground;
The 7th resistance; And
The 8th resistance, described the 7th resistance and described the 8th resistance are series between described the 5th resistance and the tie point and ground of described the 6th resistance, and described the 7th resistance is connected the power-off detecting pin of described central processing unit with the tie point of described the 8th resistance.
5. network communication equipment as claimed in claim 1, is characterized in that, described charge-discharge circuit comprises:
Thermistor, one end connects described external power source;
Diode, the other end of thermistor described in anodic bonding, negative electrode connects described power supply circuits; And
At least one the second electric capacity, is connected between the negative electrode and ground of described diode.
6. network communication equipment as claimed in claim 1, is characterized in that, described power supply circuits comprise:
Pressurizer, comprises input and output, and described input connects described charge-discharge circuit, and described output is exported the first output voltage, is described overheated circuit for detecting and the power supply of described overheating protection circuit; And
Multiple power transfer module; comprise first input end, the second input and output; the first input end of described power transfer module connects described charge-discharge circuit; the second input of described power transfer module connects the second electrode of the second switch element of described overheating protection circuit; the output of described power transfer module is exported multiple the second output voltages, is described central processing unit and the power supply of described subsystem circuit.
7. network communication equipment as claimed in claim 6, is characterized in that, described subsystem circuit comprises:
First with door, comprise first input end, the second input and output, described first is connected described central processing unit with the first input end of door, described first with the second input be connected the control utmost point of the second switch element of described overheating protection circuit; And
Subsystem element, connects one of described power transfer module, by one of described second output voltage power supply, and connect described first with the output of door.
8. network communication equipment as claimed in claim 7, is characterized in that, described subsystem circuit also comprises:
Second with door, comprise first input end, the second input and output, described second is connected described voltage detection circuit with the first input end of door, described second with the second input be connected the control utmost point of the second switch element of described overheating protection circuit; And
USB power subsystem, connect described second with the output of door, for according to described second with the control of door, be external USB client power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110141645.3A CN102801536B (en) | 2011-05-27 | 2011-05-27 | Network communication equipment |
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| CN201110141645.3A CN102801536B (en) | 2011-05-27 | 2011-05-27 | Network communication equipment |
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| CN102801536B true CN102801536B (en) | 2014-12-10 |
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| CN1921405A (en) * | 2005-08-26 | 2007-02-28 | 鸿富锦精密工业（深圳）有限公司 | Network equipment capable of generating electric-breaking signal |
| CN101373893A (en) * | 2007-08-24 | 2009-02-25 | 鹏智科技(深圳)有限公司 | Over temperature protection circuit for battery |
| CN101478151A (en) * | 2009-01-20 | 2009-07-08 | 建汉科技股份有限公司 | Voltage detection and control circuit |
| CN201656433U (en) * | 2010-02-05 | 2010-11-24 | 国基电子（上海）有限公司 | Overheat protection circuit and electronic equipment using overheat protection circuit |
| CN201733320U (en) * | 2010-07-15 | 2011-02-02 | 鸿富锦精密工业（深圳）有限公司 | Network equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI418176B (en) * | 2011-05-27 | 2013-12-01 | Hon Hai Prec Ind Co Ltd | Network communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1921405A (en) * | 2005-08-26 | 2007-02-28 | 鸿富锦精密工业（深圳）有限公司 | Network equipment capable of generating electric-breaking signal |
| CN101373893A (en) * | 2007-08-24 | 2009-02-25 | 鹏智科技(深圳)有限公司 | Over temperature protection circuit for battery |
| CN101478151A (en) * | 2009-01-20 | 2009-07-08 | 建汉科技股份有限公司 | Voltage detection and control circuit |
| CN201656433U (en) * | 2010-02-05 | 2010-11-24 | 国基电子（上海）有限公司 | Overheat protection circuit and electronic equipment using overheat protection circuit |
| CN201733320U (en) * | 2010-07-15 | 2011-02-02 | 鸿富锦精密工业（深圳）有限公司 | Network equipment |
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Effective date of registration: 20170601 Address after: Xiaoshan District of Hangzhou City, Zhejiang province Wen Yan Street No. 1711, Hunan Patentee after: Hangzhou Avisi Electronic Co., Ltd. Address before: 201613 Shanghai City, Songjiang District Shanghai city south of Songjiang Export Processing Zone Road No. 1925 Co-patentee before: Hon Hai Precision Industry Co., Ltd. Patentee before: Ambit Microsystems (Shanghai) Co., Ltd. |