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Method for judging overvoltage and undervoltage of mains supply

A technology of electric overvoltage and mains power, applied in the protection of under-voltage or no-voltage reaction, protection of over-voltage reaction, electrical components, etc., can solve the instability of mains voltage, damage to electrical equipment, Loss and other issues, to achieve the effect of stable work, fast speed and small error

Active Publication Date: 2022-04-12
盈帜科技(常州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Mains power, that is, power frequency alternating current, often has unstable mains voltage when supplying power to different equipment, such as overvoltage or undervoltage, which often leads to damage to electrical equipment and causes very large losses

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  • Method for judging overvoltage and undervoltage of mains supply
  • Method for judging overvoltage and undervoltage of mains supply
  • Method for judging overvoltage and undervoltage of mains supply

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Embodiment Construction

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] like figure 1 As shown, the mains voltage control system includes a control unit 1, a sampling circuit 2, a mains 3, a switch 4, a backup power supply 5, and a load 6. The sampling circuit 6 collects the mains voltage in real time and sends it to the control unit 1. The unit 1 monitors the working state of the mains 3. When the control unit 1 detects that the mains 3 has overvoltage, undervoltage or cut-off, it controls the switch 4 to switch the power supply channe...

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Abstract

The invention provides a method for judging overvoltage and undervoltage of a mains supply, which comprises the following steps of: S10, setting a first threshold voltage, and comparing a real-time voltage amplitude of the mains supply with the first threshold voltage to generate a first square wave signal; s20, a second threshold voltage is set, the amplitude of the second threshold voltage is smaller than the amplitude of the first threshold voltage, the real-time voltage amplitude of the mains supply is compared with the second threshold voltage, and a second square wave signal is generated; step S30, calculating durations T1, T2, T3 and T4 according to the first square wave signal and the second square wave signal; and S40, the working state of the mains supply voltage is judged according to the duration T1, the duration T2, the duration T3 and the duration T4. The state of the mains supply voltage can be judged in time, the power supply channels of the mains supply and the standby power supply are quickly switched, and the uninterruptible power supply is provided for the load.

Description

technical field [0001] The invention relates to the technical field of mains voltage detection, in particular to a method for judging overvoltage and undervoltage of mains. Background technique [0002] Mains power, that is, power frequency alternating current, often has unstable mains voltage when it supplies power to different equipment, such as overvoltage or undervoltage, which often leads to damage to electrical equipment and causes very large losses. Therefore, it is necessary to monitor the power supply of the mains in real time and judge the working status of the mains. When a fault occurs, it should be switched to the backup power supply in time to provide uninterrupted power for the electrical equipment to ensure continuous and stable operation of the electrical equipment. Contents of the invention [0003] In view of the above problems, the present invention provides a method for judging the overvoltage and undervoltage of the mains power, timely judges the stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02H3/20H02H3/24
CPCY04S20/20Y02B70/30
Inventor 不公告发明人
Owner 盈帜科技(常州)有限公司
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