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AC220V voltage detection circuit for fire fighting equipment power supply

A technology of voltage detection circuit and fire-fighting equipment, which is applied in the direction of power supply test, current/voltage measurement, and measurement using digital measurement technology. It can solve the problems of low detection accuracy and instability of detection circuit, and achieve less components and insulation Effects of performance improvement and cost reduction

Pending Publication Date: 2018-02-23
BAIYI LIGHTING (SHANGHAI) HLDG LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides an AC220V voltage detection circuit used for fire-fighting equipment power supply, which is used to solve the problem of low detection accuracy and instability of the existing low-frequency transformer detection circuit

Method used

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  • AC220V voltage detection circuit for fire fighting equipment power supply
  • AC220V voltage detection circuit for fire fighting equipment power supply

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Embodiment Construction

[0019] Such as figure 2 As shown, the high-voltage pulse width AC220V detection circuit for the power supply of fire-fighting equipment of the present invention includes an MCU, and the detection circuit includes a rectifier bridge BD1, and the input end of the rectifier bridge BD1 is connected to the AC220V voltage to be detected. The two ends of the output of the rectifier bridge BD1 are respectively connected to the voltage regulator tube ZD1 and the voltage regulator tube ZD2 through a current-limiting resistor. The output anode of the rectifier bridge BD1 is connected to the cathode of the voltage regulator tube ZD1 through a resistor R1, and the output cathode of the rectifier bridge BD1 is connected to a stable resistor through a resistor R3. Press the positive pole of tube ZD2. The positive pole of the voltage regulator tube ZD1 is connected to the positive input terminal of the optocoupler U1 through a resistor R2, and the negative pole of the voltage stabilizer tube ...

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Abstract

The invention relates to an AC220V voltage detection circuit for a fire fighting equipment power supply. The detection circuit comprises an MCU and a rectifier bridge BD1, the input end of the rectifier bridge BD1 is connected with to-be-detected AC220V voltage, and the two ends of rectifier bridge BD1 output are connected with a voltage regulator tube ZD1 and a voltage regulator tube ZD2 throughcurrent limiting resistors respectively; the positive electrode of rectifier bridge BD1 output is connected with the negative electrode of the voltage regulator tube ZD1 through a resistor R1, the negative electrode of rectifier bridge BD1 output is connected with the positive electrode of the voltage regulator tube ZD2 through a resistor R3, the positive electrode of the voltage regulator tube ZD1 is connected with the input end positive electrode of an optocoupler U1 through a resistor R2, the negative electrode of the voltage regulator tube ZD2 is connected with the input end negative electrode of the optocoupler U1 through a resistor R4, a collector of the optocoupler U1 output end is connected with an IO input pin of the MCU, and an emitter of the optocoupler U1 output end is grounded.

Description

Technical field [0001] The invention belongs to the technical field of fire fighting equipment, and particularly relates to an AC220V voltage detection circuit used for the power supply of fire fighting equipment. Background technique [0002] In the existing national standard GB 28184-2011 "Fire-fighting equipment power monitoring system", when it comes to AC grid voltage and backup power switching control, there are the following regulations: [0003] 4.2.1.3 The monitor power supply shall be equipped with main power supply and backup power supply. When the fluctuation range of the AC power supply voltage is within the range of 85% to 110% of the rated voltage of 220V, the monitor should be able to work normally. [0004] 4.2.1.4 The power supply part of the monitor shall have the conversion function of main power supply and standby power supply. When the main power supply is disconnected, it can automatically switch to the standby power supply; when the main power supply is rest...

Claims

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Application Information

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IPC IPC(8): G01R31/42G01R19/25
CPCG01R19/2503G01R31/42
Inventor 谢文学
Owner BAIYI LIGHTING (SHANGHAI) HLDG LTD
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