CN-121984207-A - Low-cost power failure warning circuit and system applied to monitoring camera

CN121984207ACN 121984207 ACN121984207 ACN 121984207ACN-121984207-A

Abstract

The invention discloses a low-cost power failure warning circuit and system applied to a monitoring camera, and relates to the technical field of power management of security monitoring equipment; the system comprises a power failure detection judging module, a Faraday capacitor charging module, a boost circuit starting module, a backup power supply switching module and a standby power supply switching module, wherein the power failure detection judging module judges whether a power failure risk exists or not based on a direct current power supply voltage signal acquired in real time and a preset undervoltage threshold value, the Faraday capacitor charging module is used for carrying out buck conversion on the direct current power supply voltage signal when the power failure risk does not exist, the boost circuit starting module is used for enabling a withstand voltage Faraday capacitor to serve as a backup direct current power supply when the power failure risk exists, the backup power supply switching module is used for carrying out multistage direct current voltage conversion on the output voltage of the backup direct current power supply to obtain multiple paths of stable working voltages, and the problem that a monitoring camera cannot sense and report a power failure alarm in real time due to instant power failure when the external direct current power supply is interrupted is solved by the low-cost backup power supply and power failure detection structure.

Inventors

LIU DONGSHENG
LIU GUOPING
CHEN XIAOMING
YI JINHONG

Assignees

东莞市乔安智联科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. A low-cost power-down warning system applied to a monitoring camera, comprising: the power failure detection judging module judges whether the power failure risk exists or not on the basis of the direct-current power supply voltage signals acquired in real time and a preset undervoltage threshold value; The Faraday capacitor charging module is used for performing buck conversion on the direct-current power supply voltage signal when the power failure risk does not exist, and is used as a Faraday capacitor charging power supply for charging the withstand voltage Faraday capacitor; The boost circuit starting module is used for performing boost conversion on the output voltage of the voltage-resistant Faraday capacitor by generating a power-down trigger signal when the power-down risk exists, so that the voltage-resistant Faraday capacitor is used as a backup direct-current power supply; The backup power supply switching module is used for carrying out multistage direct-current voltage conversion on the output voltage of the backup direct-current power supply to obtain multiple paths of stable working voltages; and the alarm and closing module is used for generating corresponding power failure alarm information when generating a power failure trigger signal and closing the backup direct current power supply.
2. The low-cost power down warning system for a monitoring camera according to claim 1, wherein a digital filtering process is performed on the dc power supply voltage signal before the determination of the dc power supply state to suppress the influence of short-term disturbance on the dc power supply state determination result.
3. The low-cost power failure warning system applied to the monitoring camera according to claim 1 is characterized in that a continuous sampling confirmation mode is adopted for judging power failure risk, wherein the continuous sampling confirmation mode comprises the step of judging consistency of DC power supply voltage signals acquired for each time within preset continuous sampling times.
4. The low-cost power failure warning system applied to a monitoring camera according to claim 3, wherein the consistency judgment comprises the step of judging that the power failure risk does not exist when the direct-current power supply voltage is larger than an under-voltage threshold value in a sampling period, and the step of judging that the power failure risk exists when the direct-current power supply voltage is smaller than or equal to the under-voltage threshold value in preset continuous sampling times.
5. The low-cost power-down warning system applied to a monitoring camera according to claim 1, wherein the voltage-resistant faraday capacitor maintains an energy storage state when the state of the direct-current power supply is not determined to be at risk of power down, and enters an energy release preparation state after the state of the direct-current power supply is determined to be at risk of power down.
6. The low-cost power down warning system for a monitoring camera according to claim 1, wherein after the dc power state is determined to be at risk of power down, the dc power state determination result is kept in a locked state until the backup dc power is turned off.
7. The low-cost power-down warning system for a monitoring camera according to claim 1, wherein the withstand voltage faraday capacitor is continuously charged to a voltage close to an upper limit voltage of the withstand voltage in a normal power supply state of the direct current power supply.
8. The low-cost power failure warning system for a monitoring camera according to claim 1, wherein the backup direct current power supply is processed by a backflow prevention path to replace the direct current power supply to work, and the backup direct current power supply is blocked from energy backflow.
9. The low-cost power-down warning system for a monitoring camera according to claim 1, wherein the generation and transmission of the power-down warning information are preferentially executed when the backup dc power supply outputs the voltage, and the output of the backup dc power supply is ended after the transmission of the power-down warning information is completed.
10. A low-cost power failure warning circuit applied to a monitoring camera, which is used for realizing the low-cost power failure warning system applied to the monitoring camera according to any one of claims 1-9, and is characterized by comprising a main control SOC circuit, a power failure detection circuit, a Faraday capacitor charging and discharging circuit and a warning circuit; The main control SOC circuit is used for completing the acquisition of the state of the direct current power supply, the judgment of the power failure event, the control of backup power supply and the generation of power failure alarm information; The power-down detection circuit is used for achieving electric quantity acquisition and signal conversion of a main board power supply state and providing a basic data source for power-down event judgment; the Faraday capacitor charging and discharging circuit is used for completing energy storage during normal power supply and providing a short-time stable backup direct current power supply after a power failure event occurs so as to support the complete execution of a power failure warning process; the alarm circuit is used for reliably transmitting the power-down information to the user side after the power-down event occurs and guiding the system to enter a safe shutdown state after the alarm is completed.

Description

Low-cost power failure warning circuit and system applied to monitoring camera Technical Field The invention relates to the technical field of power management of security monitoring equipment, in particular to a low-cost power failure warning circuit and system applied to a monitoring camera. Background The monitoring camera products on the market usually rely on an external direct current power supply to continuously supply power so as to complete the functions of video acquisition, image coding, data storage, network transmission and the like. In application scenarios such as home security, shop monitoring, warehouse management, and public area security, a monitoring camera is often used as important security protection equipment, and the running state of the monitoring camera is directly related to personal and property security of a user. In order to meet the working requirements of an internal image processing unit, a communication module and a peripheral circuit of a monitoring camera, the existing monitoring camera product is generally provided with a multi-stage direct-current voltage conversion structure in equipment, and an external input power supply is converted into multiple paths of working voltages so as to maintain the normal operation of each functional module. However, in the actual use process, the external dc power source on which the monitoring camera depends may be abnormal due to interruption of the mains supply, damage of the power supply line, or artificial power failure. Once the external direct current power supply is interrupted, the existing monitoring camera product usually stops working immediately and cannot finish video acquisition and data transmission continuously. More importantly, most monitoring camera products on the market cannot send power-down warning information to a user side or a remote management platform when an external direct current power supply is interrupted, and a user can only indirectly find abnormal conditions through monitoring picture interruption or equipment offline state after a fact. Because the monitoring camera loses power supply capacity at the moment of power failure, the main control unit and the communication module inside the equipment cannot continue to operate, so that a power failure event cannot be perceived and reported in real time. When the monitoring camera stops working due to power failure, a user cannot know the equipment failure state at the first time, cannot take measures in time to recover power supply or check abnormality, and potential safety hazards are easily formed in the monitoring blind area. In some application scenarios, the outage behavior itself may be part of a malicious damage or intrusion behavior, and if the monitoring camera cannot send an alarm to the user when the outage occurs, the security protection capability of the monitoring system will be seriously weakened. In the existing part of monitoring camera products, although the working time is prolonged by externally connecting an uninterruptible power supply or internally arranging a battery, the scheme generally increases the equipment cost, the volume and the maintenance complexity, and not all application scenes are suitable for configuring an independent uninterruptible power supply system. Meanwhile, the problem of low resource utilization rate and insufficient cost performance exists by adopting a complete uninterrupted power system aiming at the short-time functional requirement of only completing the power failure warning. In view of the above, the present invention provides a low-cost power-down warning circuit and system for a monitoring camera to solve the above problems. Disclosure of Invention In order to overcome the defects in the prior art and achieve the purposes, the invention provides a low-cost power failure warning system applied to a monitoring camera, which comprises the following technical scheme: the power failure detection judging module judges whether the power failure risk exists or not on the basis of the direct-current power supply voltage signals acquired in real time and a preset undervoltage threshold value; The Faraday capacitor charging module is used for performing buck conversion on the direct-current power supply voltage signal when the power failure risk does not exist, and is used as a Faraday capacitor charging power supply for charging the withstand voltage Faraday capacitor; The boost circuit starting module is used for performing boost conversion on the output voltage of the voltage-resistant Faraday capacitor by generating a power-down trigger signal when the power-down risk exists, so that the voltage-resistant Faraday capacitor is used as a backup direct-current power supply; The backup power supply switching module is used for carrying out multistage direct-current voltage conversion on the output voltage of the backup direct-current power supply to obtain multiple paths of stable working voltages; and the