Communication device power on detection circuit
By employing a combination of resistor voltage divider structure, filter circuit and optocoupler components in communication equipment, the problems of common ground interference, mechanical oxidation failure and high power consumption of traditional power supply detection methods are solved, and high reliability and low power consumption power status detection are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU CHENXIAO TECH
- Filing Date
- 2025-06-05
- Publication Date
- 2026-07-21
Smart Images
Figure CN224536147U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of power supply in-situ detection technology for communication equipment, and in particular relates to a power supply in-situ detection circuit for communication equipment. Background Technology
[0002] In communication equipment, the reliability of the power supply module directly affects system stability. Equipment typically uses dual or multiple power supply modules so that when the main power supply fails, the backup power supply can automatically take over, preventing communication interruptions due to a single point of failure. Therefore, in-situ monitoring of multiple power supplies is essential to prevent the power redundancy design from failing due to a single power supply failure, thus impacting the stability of equipment operation.
[0003] Traditional detection methods use voltage comparators, mechanical switches, or dedicated detection chips to detect power supply status. These methods suffer from common ground interference, the risk of oxidation failure due to mechanical contact detection, high power consumption, slow response speed, lack of electrical isolation, and high cost. Utility Model Content
[0004] In view of this, the main objective of this application is to provide a power supply presence detection circuit for communication devices.
[0005] The technical solution adopted in this application is as follows: a power supply presence detection circuit for communication equipment, including,
[0006] A resistor voltage divider structure is disposed on the power input terminal, and the resistor voltage divider structure is used to adjust the detection voltage range of a wide power supply.
[0007] A filter circuit is provided at the power output terminal to eliminate false triggering; an optocoupler element is provided between the resistor voltage divider structure and the filter circuit; the resistor voltage divider structure is connected to the input terminal of the optocoupler element; the filter circuit is connected to the output terminal of the optocoupler element; the optocoupler element is used for input / output electrical isolation.
[0008] Furthermore, the voltage divider structure includes a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected to the power input terminal; the first voltage divider resistor is connected to the PIN1 terminal of the optocoupler element; the third voltage divider resistor is connected to the PIN2 terminal of the optocoupler element and grounded; the second voltage divider resistor is connected between the first voltage divider resistor and the third voltage divider resistor.
[0009] Furthermore, the filtering circuit includes a pull-up resistor and a filter capacitor connected to the power output terminal;
[0010] The pull-up resistor is connected to the PIN4 terminal of the optocoupler element;
[0011] The filter capacitor is connected in parallel to the output terminal of the optocoupler element.
[0012] Furthermore, the PIN4 terminal of the optocoupler element is connected to the I / O port of the main control chip through the pull-up resistor.
[0013] Compared with the prior art, the present application has the following advantages: it realizes the electrical isolation between power status detection and main control circuit through optocoupler, and has the characteristics of high reliability, low power consumption and fast response. Attached Figure Description
[0014] The following figures are for illustrative purposes only and are not intended to limit the scope of this application, wherein: Figure 1 This is the circuit diagram for this application. Detailed Implementation
[0015] To make the objectives, technical solutions, design methods, and advantages of this application clearer, the following detailed description, in conjunction with the accompanying drawings, provides specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.
[0016] This application relates to a power supply presence detection circuit for communication equipment, see reference. Figure 1 It includes,
[0017] A resistor voltage divider structure is provided on the power input terminal VIN. The resistor voltage divider structure is used to adjust the detection voltage range of a wide power supply. By adjusting the resistance value of the voltage divider resistor, the voltage at the input terminal of the optocoupler is kept within the optocoupler range.
[0018] A filter circuit is provided on the power output terminal VCC, and the filter circuit is used to eliminate false triggering.
[0019] An optocoupler element U1 is disposed between the resistor voltage divider structure and the filter circuit; the resistor voltage divider structure is connected to the input terminal of the optocoupler element U1; the filter circuit is connected to the output terminal of the optocoupler element U1; the optocoupler element U1 is used for input / output electrical isolation.
[0020] In the above, refer to Figure 1As shown, the voltage divider structure includes a first voltage divider resistor R1, a second voltage divider resistor R2, and a third voltage divider resistor R3 connected to the power input terminal VIN; the first voltage divider resistor R1 is connected to the PIN1 terminal of the optocoupler element; the third voltage divider resistor R3 is connected to the PIN2 terminal of the optocoupler element and grounded; the second voltage divider resistor R2 is connected between the first voltage divider resistor R1 and the third voltage divider resistor R3; in the above, a wider voltage range detection can be achieved by flexibly adjusting the resistance value of the voltage divider resistors.
[0021] In the above, refer to Figure 1 As shown, the filtering circuit includes a pull-up resistor R4 and a filter capacitor C1 connected to the power output terminal VCC; the pull-up resistor R4 is connected to the PIN4 terminal of the optocoupler element; and the filter capacitor C1 is connected in parallel to the output terminal of the optocoupler element U1.
[0022] In the above, refer to Figure 1 As shown, the PIN4 terminal of the optocoupler element is connected to the IO port of the main control chip through the pull-up resistor R4.
[0023] In the above, VIN is the power input terminal connected to voltage divider resistors R1, R2, and R3; GND1 is the power input terminal reference return GND; optocoupler device PIN1 and PIN2 are connected to the voltage divider nodes at the input terminal; the output terminal of optocoupler device PIN4 is connected to the IO port of the main control chip MCU through pull-up resistor R4; filter capacitor C1 is connected in parallel at the output terminal of the optocoupler; GND2 is the output terminal reference return GND; and VCC voltage is the same as the power supply voltage of the IO port of the main control chip.
[0024] In the above process, when the VIN power supply is connected, the voltage is divided by resistors R1 / R2 / R3 to drive the LED terminal of optocoupler U1, causing the phototransistor of optocoupler U1 to conduct. The MCU_IO signal at the output terminal of the optocoupler is connected to GND2. The main control chip MCU receives a low-level signal 0, indicating that the power supply is powered on normally. When the VIN power supply is faulty or not connected, no current flows through the LED terminal of optocoupler U1, so the LED cannot be driven to light up. The phototransistor of the optocoupler is turned off, and the resistance between the MCU_IO signal at the output terminal of the optocoupler and GND2 is very high. The MCU_IO signal is pulled to a high level of VCC through resistor R4. The main control chip MCU receives a high-level signal 1, indicating that the power supply is abnormal and the fault needs to be investigated. The output VCC voltage is flexible and can be adapted to different MCU_IO voltage levels.
[0025] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A power supply presence detection circuit for communication equipment, characterized in that, include, A resistor voltage divider structure is disposed on the power input terminal, and the resistor voltage divider structure is used to adjust the detection voltage range of a wide power supply. A filtering circuit is provided at the power output terminal, and the filtering circuit is used to eliminate false triggering. An optocoupler element is disposed between the resistor voltage divider structure and the filter circuit; the resistor voltage divider structure is connected to the input terminal of the optocoupler element; the filter circuit is connected to the output terminal of the optocoupler element; the optocoupler element is used for input / output electrical isolation.
2. The communication equipment power supply presence detection circuit according to claim 1, characterized in that, The voltage divider structure includes a first voltage divider resistor, a second voltage divider resistor, and a third voltage divider resistor connected to the power input terminal; the first voltage divider resistor is connected to the PIN1 terminal of the optocoupler element; the third voltage divider resistor is connected to the PIN2 terminal of the optocoupler element and grounded; the second voltage divider resistor is connected between the first voltage divider resistor and the third voltage divider resistor.
3. The communication equipment power supply presence detection circuit according to claim 1, characterized in that, The filtering circuit includes a pull-up resistor and a filter capacitor connected to the power output terminal; The pull-up resistor is connected to the PIN4 terminal of the optocoupler element; The filter capacitor is connected in parallel to the output terminal of the optocoupler element.
4. The communication equipment power supply presence detection circuit according to claim 3, characterized in that, The PIN4 terminal of the optocoupler element is connected to the I / O port of the main control chip through the pull-up resistor.