Power failure alarm circuit

Abstract

The invention relates to a power failure alarm circuit which comprises a first power source, a second power source, a controller, a diode and an energy storage capacitor, the anode of the diode is connected with the first power source, the cathode of the diode is connected with the second power source, the controller is connected with the first power source and the second power source, and the energy storage capacitor is connected with the controller. The first end of the energy storage capacitor is connected with the second power supply, and the second end is grounded. According to the power failure alarm circuit provided by the invention, the power failure alarm capacitor capacity can be reduced, and the material cost is reduced; the usable area of the circuit board is reduced, the space utilization rate of the circuit board is improved, and layout and wiring are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of power failure alarm, and in particular to a power failure alarm circuit. Background Art

[0002] During the use of the optical modem, in order to ensure the stable and uninterrupted operation of the business, the status monitoring of the equipment is a necessary function of the optical modem, and the Dying Gasp (power off alarm) function is a monitoring and alarm method for the power supply of the equipment. Its principle is to monitor the input voltage. When the equipment is powered off, the energy storage function of the energy storage components (large capacitors) on the equipment is used to send the final status information of the equipment to the OLT (optical line terminal), thereby realizing the power off alarm.

[0003] During the entire process of realizing the power-off alarm function, the power-off alarm response time needs to be no longer than the power-off holding time, and the power-off holding time is generally achieved by a large capacitor. In order to meet the time requirement, especially when the equipment is fully loaded, there are higher requirements on the size and quantity of the capacitor. With the increase of equipment functions and the pressure of product competition, the size and cost requirements of the PCB (circuit board) become particularly important.

[0004] The problem in the prior art is that the power-off alarm capacitor used in the prior design has a large capacity and a high price; the prior design has a large capacitor capacity and a large volume, requires a large circuit board area, and is not conducive to the routing and layout of other devices. Summary of the invention

[0005] In view of this, the present invention provides a power failure alarm circuit.

[0006] Specifically, the present invention is achieved through the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a power off alarm circuit, comprising: a first power supply, a second power supply, a controller, a diode and an energy storage capacitor, wherein the anode of the diode is connected to the first power supply and the cathode is connected to the second power supply, the controller is connected to the first power supply and the second power supply respectively, and the first end of the energy storage capacitor is connected to the second power supply and the second end is grounded.

[0008] Optionally, it also includes: a load, which is connected to the first power supply.

[0009] Optionally, it also includes: a third power supply, which is connected to the first power supply.

[0010] Optionally, it further includes: an optical line terminal, which is connected to the controller.

[0011] Optionally, it further includes: a filter circuit, which is connected to the third power supply and the first power supply respectively.

[0012] Optionally, it further includes: a voltage divider circuit, which is connected to the first power supply and the controller respectively.

[0013] Optionally, the filtering circuit includes: a second capacitor, a first end of the second capacitor is connected to the third power supply and the first power supply respectively, and a second end of the second capacitor is grounded.

[0014] Optionally, the filtering circuit further includes: a filtering capacitor, and the filtering capacitor is connected in parallel with the second capacitor.

[0015] Optionally, the voltage divider circuit includes: a first resistor and a second resistor, wherein the first end of the first resistor is connected to the first power supply, the second end of the first resistor is respectively connected to the controller and the first end of the second resistor, and the second end of the second resistor is grounded.

[0016] Optionally, the voltage-dividing circuit further includes: a voltage-dividing capacitor, and the voltage-dividing capacitor is connected in parallel with the second resistor.

[0017] The technical solution provided by the present invention brings at least the following beneficial effects:

[0018] A power-off alarm circuit provided in the present application can reduce the capacity of the power-off alarm capacitor and reduce material costs; reduce the use area of ​​the circuit board, improve the space utilization rate of the circuit board, and facilitate layout and routing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic diagram of a power failure alarm circuit provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a filter circuit in a power failure alarm circuit provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a voltage divider circuit in a power-off alarm circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Reference Figure 1-3 As shown, the present application provides a power off alarm circuit, including: a first power supply B, a second power supply G, a controller F, a diode D1 and an energy storage capacitor C1, wherein the anode of the diode D1 is connected to the first power supply B and the cathode is connected to the second power supply G, the controller F is connected to the first power supply B and the second power supply G respectively, and the first end of the energy storage capacitor C1 is connected to the second power supply G and the second end is grounded.

[0026] In the embodiment of the present application, a diode D1 is added between the first power supply B and the second power supply G, and the front and rear power supplies (the first power supply B and the second power supply G) are separated by utilizing the principle that the diode D1 cannot conduct in the reverse direction. The energy storage capacitor C1 of the rear stage can only supply power to the second power supply G, thereby achieving the purpose of power-off alarm with a smaller capacity capacitor.

[0027] Exemplarily, it also includes: a load, which is connected to the first power supply B.

[0028] In the embodiment of the present application, loads C, D, and E are directly connected to the first power supply B and can receive electrical energy from the first power supply B to work.

[0029] Exemplarily, it also includes: a third power supply A, which is connected to the first power supply B.

[0030] In the embodiment of the present application, the third power source A is used to input electrical energy to the first power source B.

[0031] Exemplarily, it also includes: an optical line terminal, which is connected to the controller F.

[0032] In the embodiment of the present application, the optical line terminal can issue a power failure alarm after receiving a power failure alarm signal sent by the line. For example, the power failure alarm signal is a specific pulse in the circuit, and the optical line terminal can issue a flashing alarm after receiving the pulse.

[0033] Exemplarily, it also includes: a filter circuit, which is connected to the third power supply A and the first power supply B respectively.

[0034] In the embodiment of the present application, the filter circuit is used to receive the voltage of the third power supply A, and filter out the ripple in the voltage transmitted by the third power supply A, so as to provide more stable power to the first power supply B.

[0035] Exemplarily, it also includes: a voltage divider circuit, which is connected to the first power supply B and the controller F respectively.

[0036] In the embodiment of the present application, the voltage divider circuit can distribute the voltage delivered by the first power supply B into different proportions, and then supply the voltage to the controller F for use.

[0037] Exemplarily, the filtering circuit includes: a second capacitor C2, a first end of the second capacitor C2 is connected to the third power supply A and the first power supply respectively, and a second end of the second capacitor C2 is grounded.

[0038] In the embodiment of the present application, the second capacitor C2 filters the input power supply (third power supply A) to remove high-frequency components in the power supply.

[0039] Exemplarily, the filtering circuit further includes: filtering capacitors C3, C4, C5, and the filtering capacitors C3, C4, C5 are connected in parallel with the second capacitor C2.

[0040] In the embodiment of the present application, the filter capacitors C3, C4, and C5 are used to enhance the effect of the second capacitor C2 in filtering out high-frequency components in the power supply.

[0041] Exemplarily, the voltage divider circuit includes: a first resistor R1 and a second resistor R2, wherein the first end of the first resistor R1 is connected to the first power supply, the second end of the first resistor R1 is respectively connected to the controller and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded.

[0042] In the embodiment of the present application, the voltage of the first power source B is coupled through the first resistor R1 and the second resistor R2 to obtain a power-off alarm signal (dying_gasp signal).

[0043] Exemplarily, the voltage-dividing circuit further includes: a voltage-dividing capacitor C6, and the voltage-dividing capacitor C6 is connected in parallel with the second resistor R2.

[0044] In the embodiment of the present application, the voltage-dividing capacitor C6 is used to keep the voltage on the second resistor R2 stable.

[0045] When the device is powered on, the third power supply A continuously charges the energy storage capacitor C1, and the energy storage capacitor C1 is in an energy storage state; when the device is powered off, the third power supply A stops inputting, the first power supply B (Vcc-Dying) loses power, the loads C, D, and E connected to the first power supply B stop working, and a power-off alarm (dying gasp) signal is sent to the controller F (CPU); the energy storage capacitor C1 starts to discharge, and the second power supply G (VDD) supplies power to the controller F (CPU) for a period of time until the energy of the energy storage capacitor C1 is completely discharged.

[0046] During the period when the energy storage capacitor C1 is discharged, the controller F (CPU) receives a power failure alarm (dying gasp) signal and processes it and uploads it to the optical line terminal, and the optical line terminal implements a power failure alarm.

[0047] The present application utilizes the principle that the diode D1 cannot conduct in the reverse direction, so the energy storage capacitor C1 only supplies power to the controller F (CPU). Therefore, the energy storage requirement of the energy storage capacitor C1 in the present application is much less than the energy required for the power supply to supply power to all loads and controllers after a power outage, so as to achieve the effect of reducing the capacitance.

[0048] A power-off alarm circuit provided in the present application can reduce the capacity of the power-off alarm capacitor and reduce material costs; reduce the use area of ​​the circuit board, improve the space utilization rate of the circuit board, and facilitate layout and routing.

[0049] It should be noted that, in the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0050] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0051] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0053] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A power failure alarm circuit, characterized in that: include: A first power supply, a second power supply, a controller, a diode and an energy storage capacitor, wherein the anode of the diode is connected to the first power supply and the cathode is connected to the second power supply, the controller is connected to the first power supply and the second power supply respectively, and the first end of the energy storage capacitor is connected to the second power supply and the second end is grounded.

2. The power failure alarm circuit according to claim 1, characterized in that: Also includes: A load is connected to the first power supply.

3. The power failure alarm circuit according to claim 1, characterized in that: Also includes: A third power supply is connected to the first power supply.

4. The power failure alarm circuit according to claim 1, characterized in that: Also includes: An optical line terminal is connected to the controller.

5. The power failure alarm circuit according to claim 3, characterized in that: Also includes: A filter circuit is connected to the third power supply and the first power supply respectively.

6. The power failure alarm circuit according to claim 1, characterized in that: Also includes: A voltage divider circuit is connected to the first power supply and the controller respectively.

7. The power failure alarm circuit according to claim 5, characterized in that: The filter circuit includes: a second capacitor, a first end of the second capacitor is connected to the third power supply and the first power supply respectively, and a second end of the second capacitor is grounded.

8. The power failure alarm circuit according to claim 7, characterized in that: The filter circuit further includes: a filter capacitor, and the filter capacitor is connected in parallel with the second capacitor.

9. The power failure alarm circuit according to claim 6, characterized in that: The voltage divider circuit includes: a first resistor and a second resistor, wherein the first end of the first resistor is connected to the first power supply, the second end of the first resistor is respectively connected to the controller and the first end of the second resistor, and the second end of the second resistor is grounded.

10. The power failure alarm circuit according to claim 9, characterized in that: The voltage-dividing circuit further includes: a voltage-dividing capacitor, and the voltage-dividing capacitor is connected in parallel with the second resistor.

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