CN107005080B - Power failure warning circuit and network equipment - Google Patents

Power failure warning circuit and network equipment Download PDF

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Publication number
CN107005080B
CN107005080B CN201580000259.9A CN201580000259A CN107005080B CN 107005080 B CN107005080 B CN 107005080B CN 201580000259 A CN201580000259 A CN 201580000259A CN 107005080 B CN107005080 B CN 107005080B
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power failure
warning circuit
failure warning
circuit
unit
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CN107005080A (en
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薛建林
曾小飞
何智
方红斌
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source

Abstract

The utility model provides a power failure warning circuit and network equipment, is including preventing flowing backward unit, the unit that steps up, energy storage unit, output control unit and detecting element, wherein: the voltage boosting unit is used for boosting the voltage of the input power supply of the power failure warning circuit when the input power supply of the power failure warning circuit is started, and charging the energy storage unit at high voltage; the energy storage unit is used for providing working voltage for a rear-stage circuit of the power failure warning circuit through the output control unit when an input power supply of the power failure warning circuit is turned off; and the output control unit is used for performing voltage stabilization treatment on the output voltage of the energy storage unit when the input power supply of the power failure warning circuit is turned off, and outputting the stabilized voltage to a post-stage circuit of the power failure warning circuit. By adopting the scheme provided by the embodiment of the invention, the volume is smaller.

Description

Power failure warning circuit and network equipment
Technical Field
The invention relates to the technical field of communication, in particular to a power failure warning circuit and network equipment.
Background
At present, many communication systems require that a network device in the system can implement a Dying gasp (legacy language), that is, the network device can send a Dying gasp message to its higher-level device when it is powered off.
For example, Optical Network devices such as ONTs (Optical Network terminals) and ONUs (Optical Network units) in an Optical communication system need to be capable of implementing a Dying gasp function. In the prior art, a structure of an optical network device capable of implementing a Dying gasp function is shown in fig. 1, and includes a power down alarm circuit 101 and a core circuit 102, an input power supply of the power down alarm circuit 101 is a power supply of the optical network device, where:
the power failure warning circuit 101 specifically comprises a backflow prevention unit 1011, an energy storage unit 1012 and a detection unit 1013; when the input power of the power failure warning circuit 101 is turned on, the input power of the power failure warning circuit 101 provides the working voltage Vo for the core circuit 102 through the backflow prevention unit 1011 and charges the energy storage unit 1012; when the input power of the power failure warning circuit 101 is turned off, the energy storage unit 1012 provides the operating voltage Vo for the core circuit 102 until the energy of the energy storage unit 1012 is exhausted; the anti-backflow unit 1011, which is usually implemented by a diode, can prevent the energy of the energy storage unit 1012 from flowing to the input power end of the power failure warning circuit 101; the detecting unit 1013 detects the working voltage Vo, and in the process that the input power of the power failure warning circuit 101 is turned off and the energy storage unit 1012 provides the working voltage Vo for the core circuit 102, the working voltage Vo provided for the core circuit 102 is gradually reduced along with energy consumption of the energy storage unit 1012, when the detecting unit 1013 detects that the working voltage Vo is lower than a preset voltage Vp, it indicates that the remaining energy of the energy storage unit 1012 is limited, and the device is about to power down, at this time, the detecting unit 1013 outputs a power failure warning signal to the core circuit 102 to trigger the core circuit 102 to send a Dying gasp message;
the core circuit 102, which implements the core function of the optical network device, includes sending a Dying gasp message by using the remaining energy of the energy storage unit 1012 in the power failure alarm circuit 101 when receiving the power failure alarm signal output by the detection unit 1013 in the power failure alarm circuit 101.
Obviously, the power failure alarm circuit is the key for realizing the Dying gasp function by the network equipment in the communication system. However, in the prior art, the volume of the energy storage unit in the power failure alarm circuit is large, which results in a large volume of the power failure alarm circuit, so that some network devices with Small volume, for example, optical network devices such as SFP (Small Form-factor Pluggable) ONTs and the like, cannot realize the Dying gasp function.
Disclosure of Invention
The embodiment of the invention provides a power failure warning circuit and network equipment, which are small in size.
The first aspect provides a power failure warning circuit, including prevent flowing backward the unit, the unit that steps up, energy storage unit, output control unit and detecting element, wherein:
the backflow prevention unit is used for providing working voltage for a rear-stage circuit of the power failure warning circuit through the backflow prevention unit when an input power supply of the power failure warning circuit is started; when the input power supply of the power failure warning circuit is turned off, the backflow prevention unit prevents the energy of the energy storage unit from flowing to the input power supply end of the power failure warning circuit;
the boosting unit is used for boosting the voltage of the input power supply of the power failure warning circuit when the input power supply of the power failure warning circuit is started, and charging the energy storage unit at high voltage;
the energy storage unit is used for providing working voltage for a rear-stage circuit of the power failure warning circuit through the output control unit when an input power supply of the power failure warning circuit is turned off;
the output control unit is used for performing voltage stabilization processing on the output voltage of the energy storage unit when an input power supply of the power failure warning circuit is turned off, and outputting a stable voltage to a post-stage circuit of the power failure warning circuit;
the detection unit is used for outputting a power failure alarm signal to a rear-stage circuit of the power failure alarm circuit when the input power supply of the power failure alarm circuit is determined to be turned off so as to trigger the rear-stage circuit of the power failure alarm circuit to send a Dying gasp message.
With reference to the first aspect, in a first possible implementation manner, the apparatus further includes a filtering unit, configured to perform filtering processing on the power failure alarm signal before the detecting unit outputs the power failure alarm signal to a subsequent circuit of the power failure alarm circuit.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the detecting unit is specifically configured to determine whether a voltage of an input power supply of the power failure warning circuit is less than a preset voltage; and when the voltage of the input power supply of the power failure warning circuit is determined to be smaller than the preset voltage, determining that the input power supply of the power failure warning circuit is closed.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a third possible implementation manner, the detecting unit is specifically configured to determine whether a voltage of an input power supply of the power-down warning circuit at a current time is less than a voltage of an input power supply of the power-down warning circuit at a previous time; and when the voltage of the input power supply of the power failure warning circuit at the current moment is determined to be smaller than the voltage of the input power supply of the power failure warning circuit at the last moment, determining that the input power supply of the power failure warning circuit is closed.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a fourth possible implementation manner, the output control unit does not output the voltage to a subsequent circuit of the power failure warning circuit when the input power of the power failure warning circuit is turned on.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the output control unit includes a low dropout linear regulator.
With reference to the first aspect, the first possible implementation manner of the first aspect, the second possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, the fourth possible implementation manner of the first aspect, or the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the backflow preventing unit is specifically an MOS transistor.
In a second aspect, a network device is provided, which includes the above power failure warning circuit.
With reference to the second aspect, in a first possible implementation manner, the network device is specifically an optical network device.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the optical network device is specifically an optical network terminal or an optical network unit.
According to the power failure warning circuit provided by the first aspect or the network device provided by the second aspect, the energy storage unit in the power failure warning circuit is charged by using a high-voltage charging method, so that the energy storage density of the energy storage unit can be improved, the size of an energy storage power supply can be reduced, the size of the power failure warning circuit can be further reduced, and the Dying gasp function can be realized by some network devices with smaller sizes.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an optical network device in the prior art;
fig. 2 is a schematic structural diagram of a power down warning circuit according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a power-down warning circuit according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of a power-down warning circuit according to an embodiment of the present invention;
fig. 5 is a detailed structural schematic diagram of a power failure warning circuit provided in embodiment 1 of the present invention;
fig. 6 is a detailed structural schematic diagram of a power failure warning circuit provided in embodiment 2 of the present invention.
Detailed Description
In order to provide a realization scheme of a power failure alarm circuit with a small volume, the embodiment of the invention provides a power failure alarm circuit and a network device, and the preferred embodiment of the invention is described below with reference to the drawings in the specification, it should be understood that the preferred embodiment described herein is only used for explaining and explaining the invention, and is not used for limiting the invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The embodiment of the present invention provides a power failure warning circuit, as shown in fig. 2, which may include a backflow prevention unit 201, a voltage boosting unit 202, an energy storage unit 203, an output control unit 204, and a detection unit 205, where:
the anti-backflow unit 201 is used for providing working voltage for a post-stage circuit of the power failure warning circuit through the anti-backflow unit 201 when an input power supply of the power failure warning circuit is started; when the input power of the power failure warning circuit is turned off, the backflow prevention unit 201 prevents the energy of the energy storage unit 203 from flowing to the input power end of the power failure warning circuit;
the boosting unit 202 is used for boosting the voltage of the input power supply of the power failure warning circuit when the input power supply of the power failure warning circuit is started, and charging the energy storage unit 203 at high voltage;
the energy storage unit 203 is used for providing working voltage for a post-stage circuit of the power failure warning circuit through the output control unit 204 when an input power supply of the power failure warning circuit is turned off;
the output control unit 204 is configured to, when the input power of the power failure warning circuit is turned off, perform voltage stabilization on the output voltage of the energy storage unit 203, and output a stable voltage to a subsequent circuit of the power failure warning circuit;
the detecting unit 205 is configured to output a power failure warning signal to a subsequent circuit of the power failure warning circuit when it is determined that the input power of the power failure warning circuit is turned off, so as to trigger the subsequent circuit of the power failure warning circuit to send a Dying gasp message.
In the power failure warning circuit provided by the embodiment of the invention, the energy storage unit 203 in the power failure warning circuit is charged by using a high-voltage charging method, so that the energy storage density of the energy storage unit 203 is improved, the volume of the energy storage power supply 203 can be reduced, the volume of the power failure warning circuit can be further reduced, and network equipment with small volume can realize the Dyinggasp function.
Preferably, the power failure warning circuit shown in fig. 2 may further include a filtering unit 206, as shown in fig. 3, the filtering unit 206 is configured to, before the detecting unit 205 outputs the power failure warning signal to a post-stage circuit of the power failure warning circuit, perform filtering processing on the power failure warning signal, and remove signal glitches, so that the power failure warning circuit is more stable and reliable.
In a specific implementation, the filtering unit 206 may be implemented by, but not limited to, a CPLD (Complex Programmable logic device) or an integrated single circuit.
The backflow prevention unit 201 may be implemented by using a diode.
Preferably, the backflow prevention unit 201 is implemented by using a controllable switching device with a small conduction voltage drop, such as an MOS transistor, so that the power failure warning circuit is suitable for some application scenarios with a small input power voltage.
For example, when in an SFP ONT, the power supply of the SFP ONT, i.e., the input power of the power-down warning circuit, is small and 3.3V, if the anti-backflow unit 201 is implemented by using a diode, the conduction voltage drop of the diode is about 0.7V, when the input power of the power-down warning circuit is turned on, the input power of the power-down warning circuit provides only 2.5V for the subsequent circuit of the power-down warning circuit through the anti-backflow unit 201, and the power supply requirement of the subsequent circuit is probably not satisfied. If the anti-backflow unit 201 is implemented by using the MOS transistor, the conduction voltage drop of the MOS transistor is very small, so that it can be ensured that the input power supply of the power failure warning circuit meets the power supply requirement of the subsequent circuit by the working voltage provided by the subsequent circuit of the power failure warning circuit through the anti-backflow unit 201.
It should be noted that the implementation of the backflow prevention unit 201 in the power failure warning circuit provided in the embodiment of the present invention by using an MOS transistor is only a preferred implementation manner, and is not limited to the present invention, and the backflow prevention unit 201 may also be a device, an integrated circuit, or the like that can implement the function of the backflow prevention unit 201, and a specific implementation manner may be specifically selected according to an actual application scenario of the power failure warning circuit.
Preferably, when the anti-backflow unit 201 is implemented by using a controllable switching device or a controllable circuit such as an MOS transistor, as shown in fig. 4, the power failure warning signal may be used as a control signal of the anti-backflow unit 201, and is used to control the on-off state of the anti-backflow unit 201. When the filtering unit 206 does not output the power-down warning signal, it indicates that the input power of the power-down warning circuit is turned on at this time, the backflow prevention unit 201 should be in the state of a path, and the input power of the power-down warning circuit provides a working voltage for a subsequent circuit of the power-down warning circuit through the backflow prevention unit 201; when the filtering unit 206 outputs the power-down warning signal, it indicates that the input power of the power-down warning circuit is turned off, and the power-down warning signal triggers the backflow prevention unit 201 to switch from the on-state to the off-state, so as to prevent the energy of the energy storage unit 203 from flowing to the input power terminal of the power-down warning circuit.
In a specific implementation, the boosting unit 202 may be implemented by, but not limited to, a boosting chip in the prior art. The power down warning signal may also be used as a control signal of the voltage boosting unit 202 to control the operating state of the voltage boosting unit 202. When the filtering unit 206 does not output the power failure warning signal, it indicates that the input power supply of the power failure warning circuit is turned on at this time, and the boosting unit 202 should be in a working state, and performs boosting processing on the voltage of the input power supply of the power failure warning circuit to charge the energy storage unit 203 at a high voltage; when the filtering unit 206 outputs the power-down warning signal, it indicates that the input power of the power-down warning circuit is turned off, and the power-down warning signal triggers the voltage boosting unit 202 to switch from the working state to the off state, without performing voltage boosting processing on the voltage of the input power of the power-down warning circuit.
However, in practice, when the input power of the power down warning circuit is turned off, the boosting unit 202 does not have an input and does not operate naturally, so that the boosting unit 202 may not substantially need a control signal.
In a specific implementation, the energy storage unit 203 may be implemented by, but not limited to, an energy storage device such as a capacitor or a storage battery.
Further, the output control unit 204 does not output voltage to the subsequent circuit of the power failure warning circuit when the input power of the power failure warning circuit is turned on.
Preferably, the power down warning signal may be used as a control signal of the output control unit 204 for controlling the output state of the output control unit 204. When the filtering unit 206 does not output the power-down warning signal, it indicates that the input power of the power-down warning circuit is turned on at this time, and the output control unit 204 does not output voltage to the subsequent circuit of the power-down warning circuit; when the filtering unit 206 outputs the power-down warning signal, it indicates that the input power of the power-down warning circuit is turned off at this time, and the power-down warning signal triggers the output control unit 204 to output a stable voltage to the subsequent circuit of the power-down warning circuit.
In a specific implementation, the output control unit 204 may be implemented by, but not limited to, a voltage regulator device such as an LDO (Low drop out regulator).
In a specific implementation, the detection unit 205 may be implemented by using a comparator.
In an embodiment of the present invention, the detecting unit 205 is specifically configured to determine whether a voltage of an input power supply of the power failure warning circuit is less than a preset voltage; when the voltage of the input power supply of the power failure warning circuit is determined to be smaller than the preset voltage, the input power supply of the power failure warning circuit is determined to be turned off, and the detection unit 205 outputs a power failure warning signal to a later-stage circuit of the power failure warning circuit; when it is determined that the voltage of the input power supply of the power failure warning circuit is not less than the preset voltage, it is determined that the input power supply of the power failure warning circuit is turned on, and the detection unit 205 does not output a power failure warning signal to a subsequent circuit of the power failure warning circuit.
In another embodiment of the present invention, the detecting unit 205 is specifically configured to determine whether the voltage of the input power supply of the power down warning circuit at the current time is less than the voltage of the input power supply of the power down warning circuit at the previous time; when the voltage of the input power supply of the power failure warning circuit at the current moment is determined to be smaller than the voltage of the input power supply of the power failure warning circuit at the last moment, the input power supply of the power failure warning circuit is determined to be closed, and the detection unit 205 outputs a power failure warning signal to a later-stage circuit of the power failure warning circuit; when the voltage of the input power supply of the power failure warning circuit at the current moment is determined to be smaller than the voltage of the input power supply of the power failure warning circuit at the previous moment, the input power supply of the power failure warning circuit is determined to be turned on, and the detection unit 205 does not output a power failure warning signal to the subsequent stage circuit of the power failure warning circuit.
The following describes a specific implementation of the power down warning circuit provided by the present invention with reference to the accompanying drawings.
Example 1:
as shown in fig. 5, a specific implementation of the power failure warning circuit provided in embodiment 1 of the present invention is that a circuit structure of the detection unit 205 may implement: and determining whether the input power supply of the power failure warning circuit is closed or not according to whether the voltage of the input power supply of the power failure warning circuit is smaller than a preset voltage or not.
In fig. 5, when the voltage of the input power of the power-down warning circuit is not less than the preset voltage, the detecting unit 205 outputs a low level signal indicating that the input power of the power-down warning circuit is turned on; when the voltage of the input power supply of the power failure warning circuit is smaller than the preset voltage, the detection unit 205 outputs a high level signal, which indicates that the input power supply of the power failure warning circuit is turned off; the high level signal is a power down warning signal, and is filtered by the filtering unit 206 and then output.
The power failure warning signal output by the filtering unit 206 is used as a trigger signal for sending a dyeinggasp message by a post-stage circuit of the power failure warning circuit, and is also used as a control signal for the backflow prevention unit 201, the boosting unit 202 and the output control unit 204.
Based on the specific implementation manner of the anti-backflow unit 201 and the detection unit 205 in fig. 5, the power failure alarm signal output by the filtering unit 206 needs to be input to the MOS transistor control terminal in the anti-backflow unit 201 after being inverted, so that correct logic control on the anti-backflow unit 201 can be implemented. Thus, a signal inversion circuit 500 is provided in fig. 5 to effect the inversion of the power down warning signal. Of course, the signal inversion process can also be implemented in the filtering unit 206, which is not limited in the present invention.
When the input power supply of the power failure warning circuit is turned on, the voltage of the input power supply of the power failure warning circuit is not less than the preset voltage, the filtering unit 206 does not output a power failure warning signal, the MOS transistor in the backflow prevention unit 201 is turned on, the MOS transistor in the output control unit 204 is turned off, the input power supply of the power failure warning circuit provides a working voltage for the subsequent circuit of the power failure warning circuit, and the capacitor in the energy storage unit 203 is charged at a high voltage through the boost chip in the boost unit 202.
At this time, although the LDO in the output control unit 204 is in an operating state, the MOS transistor in the output control unit 204 is turned off, and the LDO is idle, so that power consumption is low.
When the input power of the power failure warning circuit is turned off, the voltage of the input power of the power failure warning circuit is smaller than a preset voltage, the filtering unit 206 outputs a power failure warning signal, triggers a rear-stage circuit of the power failure warning circuit to send a Dying gasp message, triggers the MOS tube in the anti-backflow unit 201 to be turned off, and triggers the MOS tube in the output control unit 204 to be turned on, the capacitor in the energy storage unit 203 provides a stable working voltage for the rear-stage circuit of the power failure warning circuit through the output control unit 204 until the energy of the capacitor in the energy storage unit 203 is nearly exhausted, and the LDO in the output control unit 204 cannot perform voltage stabilization output any more.
As can be seen, the energy of the energy storage unit 203 is used for sending the Dying gasp message of the post-stage circuit of the power failure warning circuit, and the utilization rate of the energy is high; and the power failure warning circuit provides good working voltage stability for the rear-stage circuit.
Example 2:
as shown in fig. 6, the power failure warning circuit provided in embodiment 2 of the present invention is different from that in embodiment 1 only in that the circuit structure of the detection unit 205 is different.
The circuit configuration of the detection unit 205 in fig. 6 can implement: and determining whether the input power supply of the power failure warning circuit is closed or not according to whether the voltage of the input power supply of the power failure warning circuit at the current moment is smaller than the voltage of the input power supply of the power failure warning circuit at the last moment or not.
In fig. 6, when the voltage of the input power of the power-down warning circuit at the current moment is not less than the voltage of the input power of the power-down warning circuit at the previous moment, the detection unit 205 outputs a low-level signal indicating that the input power of the power-down warning circuit is turned on; when the voltage of the input power supply of the power failure warning circuit at the current moment is less than the voltage of the input power supply of the power failure warning circuit at the previous moment, the detection unit 205 outputs a high-level signal to indicate that the input power supply of the power failure warning circuit is turned off; the high level signal is a power down warning signal, and is filtered by the filtering unit 206 and then output.
Compared with the embodiment 1, the detection unit 205 shown in fig. 6 can detect the voltage drop when the input power of the power failure warning circuit is turned off.
The specific principle of the power failure warning circuit is similar, and is not described in detail herein.
It should be noted that, in the foregoing embodiment 1 and embodiment 2, the detecting unit 205 directly detects the input power of the power-down warning circuit to determine whether the input power of the power-down warning circuit is turned off. In other embodiments of the present invention, the detecting unit 205 determines whether the input power of the power down warning circuit is turned off by detecting other parameters, for example, an operating voltage provided for a subsequent stage circuit of the power down warning circuit, which is not limited in the present invention.
The embodiment of the invention also provides network equipment which comprises any one of the power failure warning circuits.
Further, the network device may be, but is not limited to being, an optical network device. Specifically, the ONT may be, for example, SFPONT, mini ONT, etc., or may be, for example, ONU.
In summary, by adopting the scheme provided by the embodiment of the invention, the network device with a smaller volume can realize the Dyinggasp function.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims (9)

1. The utility model provides a power failure warning circuit which characterized in that, includes prevents flowing backward unit, the unit that steps up, energy storage unit, output control unit and detecting element, wherein:
the backflow prevention unit is used for providing working voltage for a rear-stage circuit of the power failure warning circuit through the backflow prevention unit when an input power supply of the power failure warning circuit is started; when the input power supply of the power failure warning circuit is turned off, the backflow prevention unit prevents the energy of the energy storage unit from flowing to the input power supply end of the power failure warning circuit;
the boosting unit is used for boosting the voltage of the input power supply of the power failure warning circuit when the input power supply of the power failure warning circuit is started, and charging the energy storage unit at high voltage;
the energy storage unit is used for providing working voltage for a rear-stage circuit of the power failure warning circuit through the output control unit when an input power supply of the power failure warning circuit is turned off;
one input end of the output control unit is connected with the output end of the energy storage unit, and the other input end of the output control unit is connected with the output end of the detection unit, and the output control unit is used for performing voltage stabilization on the output voltage of the energy storage unit when an input power supply of the power failure warning circuit is turned off and outputting stable voltage to a post-stage circuit of the power failure warning circuit;
the detection unit is used for outputting a power failure alarm signal to a rear-stage circuit of the power failure alarm circuit when the input power supply of the power failure alarm circuit is determined to be turned off so as to trigger the rear-stage circuit of the power failure alarm circuit to send a final legacy Dyinggasp message;
the anti-backflow unit is a controllable switch device or a controllable circuit, and the power failure alarm signal is also used for controlling the on-off state of the anti-backflow unit;
the detection unit is specifically used for determining whether the voltage of the input power supply of the power-down warning circuit at the current moment is less than the voltage of the input power supply of the power-down warning circuit at the last moment; and when the voltage of the input power supply of the power failure warning circuit at the current moment is determined to be smaller than the voltage of the input power supply of the power failure warning circuit at the last moment, determining that the input power supply of the power failure warning circuit is closed.
2. The power down alarm circuit according to claim 1, further comprising a filtering unit configured to filter the power down alarm signal before the detecting unit outputs the power down alarm signal to a subsequent circuit of the power down alarm circuit.
3. The power failure warning circuit of claim 1 or 2, wherein the detecting unit is specifically configured to determine whether a voltage of an input power supply of the power failure warning circuit is less than a preset voltage; and when the voltage of the input power supply of the power failure warning circuit is determined to be smaller than the preset voltage, determining that the input power supply of the power failure warning circuit is closed.
4. The power down warning circuit according to claim 1 or 2, wherein the output control unit does not output a voltage to a subsequent circuit of the power down warning circuit when an input power of the power down warning circuit is turned on.
5. The power down alarm circuit of claim 4, wherein the output control unit comprises a low dropout linear regulator.
6. The power down warning circuit according to claim 1 or 2, wherein the backflow prevention unit is a MOS transistor.
7. A network device comprising the power down warning circuit of any of claims 1-6.
8. The network device according to claim 7, wherein the network device is in particular an optical network device.
9. The network device according to claim 8, wherein the optical network device is specifically an optical network terminal or an optical network unit.
CN201580000259.9A 2015-06-15 2015-06-15 Power failure warning circuit and network equipment Active CN107005080B (en)

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CN111130821B (en) * 2018-10-30 2023-03-31 中国移动通信有限公司研究院 Power failure alarm method, processing method and device
CN110568246B (en) * 2019-05-17 2021-09-14 上海繁易信息科技股份有限公司 Power failure alarm circuit and alarm method
CN112531876A (en) * 2020-11-26 2021-03-19 北京锐安科技有限公司 Power-down alarm control circuit
CN113899939B (en) * 2021-12-10 2022-03-29 广东省新一代通信与网络创新研究院 Power failure warning circuit and processing method for communication equipment and communication equipment
CN114442785B (en) * 2021-12-30 2023-07-18 苏州浪潮智能科技有限公司 Output holding time extension method and system for server power supply

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