Circuit for prolonging power failure alarm time and communication equipment

Abstract

The utility model discloses a circuit for prolonging power failure alarm time and communication equipment, and relates to the technical field of communication equipment power supply circuits, the circuit comprises a first power supply line and a second power supply line, the first power supply line and the second power supply line are respectively used for connecting a power supply with a first load and a second load, the first power supply line is provided with a one-way conduction unit, and an energy storage unit is arranged between the one-way conduction unit and the first load. When the communication equipment is powered down, the one-way conduction unit enables the electric quantity of the energy storage unit not to be consumed by the peripheral module, compared with the existing scheme, the electric quantity consumption of the energy storage unit is reduced, the continuous power supply time of the energy storage unit to the core module is prolonged, and the power-down alarm information sending time of the core module of the communication equipment is prolonged during the power-down. And it is ensured that alarm information has sufficient time to report. Under the condition of maintaining the same power supply duration, the capacity demand of the energy storage unit is smaller, the cost is lower, and the miniaturization design of the communication equipment is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology for communication equipment, and in particular to a circuit and communication equipment that extends the power failure alarm time. Background Technology

[0002] Passive Optical Network (PON) systems are single-fiber bidirectional optical access networks employing a point-to-multipoint (P2MP) architecture. A PON system consists of an Optical Line Terminal (OLT) at the central office, an Optical Distribution Network (ODN), and Optical Network Units (ONUs) at the user side. In the downlink direction (OLT to ONU), signals transmitted by the OLT reach each ONU via the ODN. According to China Telecom's CTC3.0 standard, after a power outage, the ONU's core module operating voltage should remain stable for at least 10ms to allow sufficient time for the ONU to issue a power outage alarm signal. This alarm signal is then transmitted to the upstream equipment via optical components. Generally, the longer the ONU's core module maintains power after a power outage is detected, the higher the reliability of the reported power outage alarm signal.

[0003] The current industry standard is to connect a large-capacity capacitor in parallel between the 12V_IN power supply and GND of the ONU. When the ONU loses power, the capacitor stores electricity to maintain power supply to the core module of the ONU for a certain period of time.

[0004] However, the existing solution has the following problems: ONU usually integrates peripheral modules such as WIFI, USB, voice, and set-top box, which are connected to the power supply network of the core module. When the ONU loses power, the peripheral modules consume the power of the capacitor at the same time, which reduces the time that the capacitor can maintain power supply. Increasing the capacitor capacity further not only takes up equipment space and cannot meet the trend of miniaturization of equipment, but also leads to increased costs. Utility Model Content

[0005] This utility model provides a circuit and communication device for extending the power failure alarm time, in order to solve the technical problem that existing communication devices extend the power supply time after a power failure by increasing the capacitor capacity, which occupies equipment space, increases hardware costs, and cannot meet the trend of equipment miniaturization.

[0006] In a first aspect, a circuit is provided to extend the power failure alarm time, comprising:

[0007] A first power supply line and a second power supply line are respectively used to connect the power source to a first load and a second load. A unidirectional conduction unit is provided on the first power supply line, and an energy storage unit is provided between the unidirectional conduction unit and the first load.

[0008] In some embodiments, the unidirectional conduction unit is a first diode.

[0009] In some embodiments, the unidirectional conduction unit includes a first resistor, a second resistor, and a first switching transistor. A first terminal of the first switching transistor is connected to a power supply, a second terminal of the first switching transistor is connected to the input terminal of the first load, a first terminal of the first resistor is connected to a power supply, a second terminal of the first resistor is connected to a third terminal of the first switching transistor, a first terminal of the second resistor is connected to a third terminal of the first switching transistor, and a second terminal of the second resistor is grounded.

[0010] In some embodiments, the first switch is a MOSFET.

[0011] In some embodiments, a second diode is connected in parallel to the first and second terminals of the first switching transistor.

[0012] In some embodiments, the unidirectional conduction unit includes a third resistor, a fourth resistor, and a second switch. The first terminal of the second switch is connected to a power supply, and the second terminal of the second switch is connected to the input terminal of the first load. The first terminal of the third resistor is connected to a power supply, and the second terminal of the third resistor is connected to the third terminal of the second switch. The first terminal of the fourth resistor is connected to the third terminal of the second switch, the second terminal of the fourth resistor is grounded, and the fourth terminal of the second switch is grounded.

[0013] In some embodiments, the second switching transistor is an electronic switching transistor, and a third diode is connected in parallel between the input and output terminals of the electronic switching transistor.

[0014] In some embodiments, the unidirectional conduction unit includes a fifth resistor, a sixth resistor, a seventh resistor, a comparator, and a third switch. The first terminal of the third switch is connected to a power supply, and the second terminal of the third switch is connected to the input terminal of the first load. The first terminal of the fifth resistor is connected to a power supply, and the second terminal of the fifth resistor is connected to the inverting input terminal of the comparator. The first terminal of the sixth resistor is connected to the input terminal of the first load, and the second terminal of the sixth resistor is connected to the non-inverting input terminal of the comparator. The first terminal of the seventh resistor is connected to the output terminal of the comparator, and the second terminal of the seventh resistor is connected to the third terminal of the third switch. The first terminal of the eighth resistor is connected to a power supply, and the second terminal of the eighth resistor is connected to the third terminal of the third switch.

[0015] In some embodiments, the energy storage unit is a capacitor.

[0016] Secondly, a communication device is provided, including the aforementioned circuit for extending the power failure alarm time.

[0017] The beneficial effects of the technical solution provided by this utility model include:

[0018] This utility model provides a circuit and communication device for extending the power failure alarm time. The circuit has a unidirectional conduction unit on a first power supply line, and an energy storage unit between the unidirectional conduction unit and a first load. When power fails, the second power supply line where the second load (peripheral module) is located does not have an energy storage unit, resulting in a faster voltage drop and faster triggering of the core module's power failure alarm detection function. Simultaneously, the energy storage unit on the first power supply line continuously supplies power to the first load (core module). The unidirectional conduction unit prevents the energy storage unit's power from being consumed by the second load, reducing the energy consumption of the energy storage unit compared to existing solutions and extending the continuous power supply time of the energy storage unit to the core module. This extends the time for sending power failure alarm information from the core module of the communication device during a power failure, ensuring sufficient time for alarm information to be reported. Under the condition of maintaining the same power supply duration, the energy storage unit requires less capacity and has lower cost, which is beneficial for the miniaturization design of communication devices. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a circuit for extending the power failure alarm time provided in an embodiment of this utility model;

[0021] Figure 2 The first circuit diagram of a circuit for extending the power failure alarm time provided in the embodiment of this utility model;

[0022] Figure 3 A second circuit diagram of a circuit for extending the power failure alarm time provided in an embodiment of this utility model;

[0023] Figure 4 A third circuit diagram of a circuit for extending the power failure alarm time provided in an embodiment of this utility model;

[0024] Figure 5 The fourth circuit diagram is provided for an embodiment of the present invention to extend the power failure alarm time. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] This utility model embodiment provides a circuit for extending the power failure alarm time, which can solve the technical problem that existing communication devices extend the power supply time after a power failure by increasing the capacitor capacity, which occupies equipment space, increases hardware costs, and cannot meet the technical problem of the trend of equipment miniaturization.

[0027] See Figure 1 As shown, this utility model embodiment provides a circuit for extending the power failure alarm time, including: a first power supply line and a second power supply line, the first power supply line and the second power supply line are respectively used to connect the power supply to a first load and a second load, a unidirectional conduction unit is provided on the first power supply line, and an energy storage unit is provided between the unidirectional conduction unit and the first load.

[0028] Specifically, see Figure 1 As shown, the first load is mainly the core module of the communication equipment, and the second load is mainly the peripheral module. The core module is used to collect the voltage at the input terminal of the unidirectional conduction unit in real time for power failure alarm detection.

[0029] When a power outage occurs, the second power supply line, where the second load (peripheral module) is located, lacks an energy storage unit, resulting in a faster voltage drop and prompting the core module's power outage alarm detection function to be triggered more quickly. Simultaneously, the energy storage unit on the first power supply line continuously supplies power to the first load (core module). The unidirectional conduction unit prevents the energy storage unit's power from being consumed by the second load, reducing energy consumption compared to existing solutions and extending the continuous power supply time to the core module. This also extends the time for sending power outage alarm information to the core module during a power outage, ensuring sufficient time for alarm information to be reported. Under the condition of maintaining the same power supply duration, the energy storage unit requires less capacity and has a lower cost, which is beneficial for the miniaturization design of communication equipment.

[0030] As an optional implementation, in one embodiment of the utility model, see [link to utility model description]. Figure 2 As shown, the unidirectional conduction unit is the first diode D1. Using the first diode D1 as the unidirectional conduction unit results in a simple structure and low cost.

[0031] As an optional implementation, in one embodiment of the utility model, see [link to utility model description]. Figure 3As shown, the unidirectional conduction unit includes a first resistor R1, a second resistor R2, and a first switching transistor Q1. The first terminal of the first switching transistor Q1 is connected to a power supply, and the second terminal of the first switching transistor Q1 is connected to a first load. The first terminal of the first resistor R1 is connected to the power supply, and the second terminal of the first resistor R1 is connected to the third terminal of the first switching transistor Q1. The first terminal of the second resistor R2 is connected to the third terminal of the first switching transistor Q1, and the second terminal of the second resistor R2 is grounded. Optionally, the first switching transistor Q1 is a MOSFET. Taking a PMOS transistor as an example, the first, second, and third terminals of the first switching transistor Q1 are the source, drain, and gate, respectively. The power supply is connected to the source of the PMOS transistor, the drain of the PMOS transistor is connected to the first load, and the gate of the PMOS transistor is connected to the first resistor R1 and the second resistor R2. By adjusting the ratio of the resistance values ​​of the first resistor R1 and the second resistor R2, the turn-off voltage of the PMOS transistor can be set. For example, when the normal supply voltage of the power supply is VIN, and the set voltage is 0.8 times VIN, the Vgs voltage of the PMOS transistor is lower than the conduction threshold of the PMOS transistor. At this time, the drain of the PMOS transistor is disconnected from the source. The circuit works as follows: when powered on, when the power supply output voltage is VIN, the drain of the PMOS transistor is turned on from the source, and the power supply can supply power to the first load; when powered off, the voltage of the power supply drops to a certain value (such as 0.8VIN), and the drain of the PMOS transistor is disconnected from the source, thereby preventing the energy storage unit from flowing back to the power supply. Although using the first diode D1 as the unidirectional conduction unit is simple in structure and low in cost, the first diode D1 has a voltage drop (0.4~0.6V) when it is working, and has a certain loss. Compared to using the first diode D1, the MOSFET has a resistance of about 0.05 ohms when it is turned on, and a voltage drop of 0.05V calculated based on a current of 1A, which is about 1 / 10 of the diode loss, giving it a significant advantage in energy saving and power consumption reduction.

[0032] Furthermore, a second diode D2 is connected in parallel to the first and second terminals of the first switching transistor Q1. Taking the MOSFET as a PMOS transistor as an example, the anode of the second diode D2 is connected to the source of the PMOS transistor, and the cathode of the second diode D2 is connected to the drain of the PMOS transistor. The second diode D2 ensures that the power-on sequence of the first power supply line and the second power supply line are consistent.

[0033] As an optional implementation, in one embodiment of the utility model, see [link to utility model description]. Figure 4As shown, the unidirectional conduction unit includes a third resistor R3, a fourth resistor R4, and a second switch Q2. The first terminal of the second switch Q2 is connected to the power supply, and the second terminal of the second switch Q2 is connected to the input terminal of the first load. The first terminal of the third resistor R3 is connected to the power supply, and the second terminal of the third resistor R3 is connected to the third terminal of the second switch Q2. The first terminal of the fourth resistor R4 is connected to the third terminal of the second switch Q2, the second terminal of the fourth resistor R4 is grounded, and the fourth terminal of the second switch Q2 is grounded. Optionally, the second switch Q2 is an electronic switch, and its first, second, third, and fourth terminals are the input terminal, output terminal, enable terminal, and ground terminal, respectively. The power supply is connected to the input terminal of the electronic switching transistor, and the output terminal of the electronic switching transistor is connected to the first load. The enable terminal of the electronic switching transistor is connected to the third resistor R3 and the fourth resistor R4. The circuit works as follows: When powered on, the enable terminal of the electronic switching transistor conducts between its input and output terminals, allowing the power supply to the first load; when powered off, the enable terminal of the electronic switching transistor disconnects its input and output terminals, thus preventing the energy storage unit from flowing back into the power supply. The Vgs threshold voltage of the MOSFET has dispersion, which can lead to slightly poor circuit consistency. A narrow threshold voltage range at the enable terminal of the electronic switching transistor results in better circuit consistency. Similarly, a third diode D3 is connected in parallel between the input and output terminals of the electronic switching transistor. The third diode D3 ensures that the power-on sequence of the first and second power supply lines is consistent.

[0034] As an optional implementation, in one embodiment of the utility model, see [link to utility model description]. Figure 5As shown, the unidirectional conduction unit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a comparator U1, and a third switch Q3. The first terminal of the third switch Q3 is connected to the power supply, and the second terminal of the third switch Q3 is connected to the input terminal of the first load. The first terminal of the fifth resistor R5 is connected to the power supply, and the second terminal of the fifth resistor R5 is connected to the inverting input terminal of the comparator U1. The first terminal of the sixth resistor R6 is connected to the input terminal of the first load, and the second terminal of the sixth resistor R6 is connected to the non-inverting input terminal of the comparator U1. The first terminal of the seventh resistor R7 is connected to the output terminal of the comparator U1, and the second terminal of the seventh resistor R7 is connected to the third terminal of the third switch Q3. The first terminal of the eighth resistor R8 is connected to the power supply, and the second terminal of the eighth resistor R8 is connected to the third terminal of the third switch Q3. Optionally, the third switch Q3 is a MOSFET. Taking a PMOS transistor as an example, the circuit operates as follows: When power is applied, the power supply output voltage is VIN, and the input voltage of the first load is less than the power supply voltage. Comparator U1 outputs a high level to turn on the PMOS transistor. When power is applied, the power supply voltage drops to a certain value, and the input voltage of the first load is greater than the power supply voltage. Comparator U1 outputs a high level to turn off the PMOS transistor, thus preventing the energy storage unit from flowing back to the power supply. Using a comparator + MOSFET scheme provides higher sensitivity and accuracy compared to using a MOSFET alone. Similarly, a fourth diode D4 can be connected in parallel between the first and second terminals of the third switch Q3.

[0035] As an optional implementation, in one embodiment of the utility model, see [link to utility model description]. Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the energy storage unit can be a capacitor. The capacitor can be an aluminum electrolytic capacitor, a silver electrode capacitor, or a ceramic capacitor. Aluminum electrolytic capacitors are characterized by large capacity, high reliability, and long life. Silver electrode capacitors are characterized by high precision, high reliability, and high temperature stability. Ceramic capacitors are characterized by simple structure, large capacity, small size, and a wide operating temperature range.

[0036] This utility model embodiment also provides a communication device, including the aforementioned circuit for extending the power failure alarm time, wherein the communication device includes an ONU, an optical AP, a home gateway, etc.

[0037] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A circuit for extending the power failure alarm time, characterized in that, include: A first power supply line and a second power supply line are respectively used to connect the power source to a first load and a second load. A unidirectional conduction unit is provided on the first power supply line, and an energy storage unit is provided between the unidirectional conduction unit and the first load.

2. The circuit for extending the power failure alarm time according to claim 1, characterized in that: The unidirectional conduction unit is a first diode.

3. The circuit for extending the power failure alarm time according to claim 1, characterized in that: The unidirectional conduction unit includes a first resistor, a second resistor, and a first switching transistor. The first end of the first switching transistor is connected to a power supply, the second end of the first switching transistor is connected to the input terminal of the first load, the first end of the first resistor is connected to a power supply, the second end of the first resistor is connected to the third end of the first switching transistor, the first end of the second resistor is connected to the third end of the first switching transistor, and the second end of the second resistor is grounded.

4. The circuit for extending the power failure alarm time according to claim 3, characterized in that: The first switching transistor is a MOSFET.

5. The circuit for extending the power failure alarm time according to claim 3, characterized in that: A second diode is connected in parallel to the first and second terminals of the first switching transistor.

6. The circuit for extending the power failure alarm time according to claim 1, characterized in that: The unidirectional conduction unit includes a third resistor, a fourth resistor, and a second switch. The first end of the second switch is connected to the power supply, and the second end of the second switch is connected to the input terminal of the first load. The first end of the third resistor is connected to the power supply, and the second end of the third resistor is connected to the third end of the second switch. The first end of the fourth resistor is connected to the third end of the second switch, the second end of the fourth resistor is grounded, and the fourth end of the second switch is grounded.

7. The circuit for extending the power failure alarm time according to claim 6, characterized in that: The second switching transistor is an electronic switching transistor, and a third diode is connected in parallel between the input and output terminals of the electronic switching transistor.

8. The circuit for extending the power failure alarm time according to claim 1, characterized in that: The unidirectional conduction unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a comparator, and a third switching transistor. The first terminal of the third switching transistor is connected to the power supply, and the second terminal of the third switching transistor is connected to the input terminal of the first load. The first terminal of the fifth resistor is connected to the power supply, and the second terminal of the fifth resistor is connected to the inverting input terminal of the comparator. The first terminal of the sixth resistor is connected to the input terminal of the first load, and the second terminal of the sixth resistor is connected to the non-inverting input terminal of the comparator. The first terminal of the seventh resistor is connected to the output terminal of the comparator, and the second terminal of the seventh resistor is connected to the third terminal of the third switching transistor. The first terminal of the eighth resistor is connected to the power supply, and the second terminal of the eighth resistor is connected to the third terminal of the third switching transistor.

9. The circuit for extending the power failure alarm time according to claim 1, characterized in that: The energy storage unit is a capacitor.

10. A communication device, characterized in that, The circuit includes the one described in any one of claims 1-9 for extending the power failure alarm time.

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