CN207396699U - A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply - Google Patents
A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply Download PDFInfo
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- CN207396699U CN207396699U CN201721476881.XU CN201721476881U CN207396699U CN 207396699 U CN207396699 U CN 207396699U CN 201721476881 U CN201721476881 U CN 201721476881U CN 207396699 U CN207396699 U CN 207396699U
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Abstract
A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply, including MCU, the detection circuit includes rectifier bridge BD1, rectifier bridge BD1 input terminals connect the voltage of AC220V to be detected, the both ends of rectifier bridge BD1 outputs connect voltage-stabiliser tube ZD1 and voltage-stabiliser tube ZD2 by current-limiting resistance respectively, wherein rectifier bridge BD1 output cathodes pass through the cathode of resistance R1 connection voltage-stabiliser tubes ZD1, rectifier bridge BD1 output negative poles pass through the anode of resistance R3 connection voltage-stabiliser tubes ZD2, the anode of voltage-stabiliser tube ZD1 passes through the input anode of resistance R2 connection optocouplers U1, the cathode of voltage-stabiliser tube ZD2 passes through the input cathode of resistance R4 connection optocouplers U1, the IO input pins of the collector connection MCU of optocoupler U1 output terminals, the emitter ground connection of optocoupler U1 output terminals.
Description
Technical field
The utility model belongs to fire-fighting equipment technical field, more particularly to a kind of AC220V electricity for fire-fighting equipment power supply
Press detection circuit.
Background technology
In existing standard GB/T 28184-2011《Fire-fighting equipment power supply monitoring system》In, it is related to AC network
When voltage and standby electric switching control, there is following regulation：
4.2.1.3 monitor power supply should set main power source and stand-by power supply.When AC network supply voltage amplitude of fluctuation is in volume
In the range of the 85%~110% of constant voltage 220V, monitor should be able to work normally.
4.2.1.4 the power unit of monitor should have main power source and stand-by power supply conversion function.When the main power source is off,
It can be automatically switched to stand-by power supply；When main power source recovers, main power source can be automatically switched to；The conversion of active and standby power supply should not influence
The normal work of monitor.
As it can be seen that by national standard, during fire-fighting equipment power work, not less than the 85% of voltage 220V, i.e., >=187V when,
Automatically switch to main electricity work.In practice, fire equipments power supply is arranged to：175V-185V is switched to main electrician
Make ,≤175V is switched to standby electricity work.
The voltage detecting of fire-fighting equipment power supply 220V is MCU detection 100-280V actual voltage values, when meeting GB 28184-
2011 when requiring, and active and standby power supply must be converted.
Fire-fighting equipment power supply 220V voltage detectings, generally use low-frequency transformer detection circuit, low-frequency transformer detection electricity
The testing principle on road is to be changed according to the transformer output voltage of AC220V with input voltage and change and realize.
Fig. 1 is existing AC220V voltage detecting circuits schematic diagram, and AC220V voltages are exported through transformer T1 transformations, output
Voltage is through BD1 rectifications, after electrolytic capacitor C1 filtering, through resistance R1 bufferings into the IO input pins of MCU, carries out voltage calculating,
MCU controls active and standby electric conversion circuit according to T1 output voltages height.Because of the energy storage of electrolytic capacitor C1, prevent output voltage from fast
Speed follows the variation of input 220V voltages, makes active and standby electric switching hysteresis, and then makes monitor cisco unity malfunction sometimes.Because becoming
Depressor output error is larger so that MCU detection voltage errors are also larger, and in 175V-185V, fire-fighting equipment power supply should be switched to
Main electricity work, but partial power is just switched to main electricity work in ＞ 187V.Such case causes fire-fighting equipment power supply product one
Cause property is deteriorated or even national standard is not achieved in some.In addition, because low-frequency transformer uses silicon steel sheet and copper wire, cost is also higher
It is high.
Utility model content
The utility model provides a kind of AC220V voltage detecting circuits for fire-fighting equipment power supply, existing to solve
Low-frequency transformer detection circuit accuracy of detection is not high, it is unstable the problem of.
A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply, including MCU, which includes rectifier bridge
BD1, rectifier bridge BD1 input terminal connect the voltage of AC220V to be detected,
The both ends of rectifier bridge BD1 outputs connect voltage-stabiliser tube ZD1 and voltage-stabiliser tube ZD2, wherein rectification by current-limiting resistance respectively
Bridge BD1 output cathodes pass through the cathode of resistance R1 connection voltage-stabiliser tubes ZD1, and rectifier bridge BD1 output negative poles are steady by resistance R3 connections
The anode of pressure pipe ZD2,
The anode of voltage-stabiliser tube ZD1 passes through the input anode of resistance R2 connection optocouplers U1, and the cathode of voltage-stabiliser tube ZD2 is by electricity
The input cathode of R4 connection optocouplers U1 is hindered,
The IO input pins of the collector connection MCU of optocoupler U1 output terminals, the emitter ground connection of optocoupler U1 output terminals.
Further, the IO output pins of MCU connect active and standby power conversion circuit, the active and standby electricity conversion electricity of main power source 24V accesses
Road, 24V battery packs access active and standby power conversion circuit.
The high pressure pulsewidth AC220V detection circuits of the utility model make use of the width of optocoupler U1 output 5V square waves with input
The characteristics of 220V voltage changes, measures 220V voltages, and detection voltage range is wide, and measurement voltage is accurate；Component used
It is few, 220V detecting element costs can be greatly lowered, reliability is high；Because using optocoupler, insulation performance increases compared with transformer.
Description of the drawings
Detailed description below is read by reference to attached drawing, the utility model illustrative embodiments above-mentioned and other
Objects, features and advantages will become prone to understand.In the accompanying drawings, show that this practicality is new by way of example, and not by way of limitation
Several embodiments of type, wherein：
Fig. 1 is existing AC220V low-frequency transformers voltage detecting circuit schematic diagram.
Fig. 2 is the AC220V high pressure pulsewidth AC220V voltage detecting circuit schematic diagrams of the utility model.
Specific embodiment
As shown in Fig. 2, the high pressure pulsewidth AC220V detection circuits for fire-fighting equipment power supply of the utility model, including
MCU, the detection circuit include rectifier bridge BD1, and rectifier bridge BD1 input terminals connect the voltage of AC220V to be detected.Rectifier bridge BD1 is defeated
The both ends gone out connect voltage-stabiliser tube ZD1 and voltage-stabiliser tube ZD2 by current-limiting resistance respectively, and wherein rectifier bridge BD1 output cathodes are by electricity
The cathode of R1 connection voltage-stabiliser tubes ZD1 is hindered, rectifier bridge BD1 output negative poles pass through the anode of resistance R3 connection voltage-stabiliser tubes ZD2.Voltage-stabiliser tube
The anode of ZD1 passes through the input anode of resistance R2 connection optocouplers U1, and the cathode of voltage-stabiliser tube ZD2 passes through resistance R4 connection optocouplers U1
Input cathode.The IO input pins of the collector connection MCU of optocoupler U1 output terminals, the emitter of optocoupler U1 output terminals connect
Ground.The IO output pins of MCU connect active and standby power conversion circuit, and main power source 24V accesses active and standby power conversion circuit, and 24V battery packs connect
Enter active and standby power conversion circuit.
Wherein, the parameter of device includes,
Rectifier bridge BD1,0.5A, 600V；Resistance R1, R2, R3, R4, R5 are 4.7K Ω -20K Ω；Voltage-stabiliser tube ZD1,
ZD2 is 50V-75V, 0.5W；Optocoupler U1, EL817.
220V is carried out rectification by rectifier bridge BD1, is 100Hz half-sine waves after rectification, trough is to peak voltage scope
0-350V, because of voltage-stabiliser tube ZD1, the voltage chopping of ZD2 adds R1, R2, R3, the current limliting of R4 resistance, makes the 120- of 100Hz half-sine waves
350V parts just can turn on optocoupler U1.Resistance R5 upper ends connect 5V, and lower end connects the collector of optocoupler U1 output terminals, optocoupler U1
The emitter ground connection of output terminal exports 5V square waves in the collector of optocoupler U1 output terminals, and the IO input pins into MCU detect.
The width of optocoupler U1 collectors output 5V square waves is with input 220V voltage changes.There is data below through actual test：
During AC150V, 5V square wave pulse widths are 8.5ms；
During AC180V, 5V square wave pulse widths are 7.8ms；
During AC220V, 5V square wave pulse widths are 6.4ms；
During AC250V, 5V square wave pulse widths are 5.2ms；
During AC280V, 5V square wave pulse widths are 4.3ms.
When main electricity AC220V works, when MCU detects 5V square wave pulse width ＜ 7.8ms, active and standby power conversion circuit is transformed into
Main electricity output.When main electricity AC220V is disconnected or during ＜ AC180V, when MCU detects 5V square wave pulse widths >=7.8ms, active and standby electricity
Conversion circuit is automatically switched to standby electricity output.
State's net frequency of supply is 50Hz, and the 100Hz half-sine waves cycle is 10ms after rectification, is detected through high pressure pulsewidth AC220V
After circuit, the 5V square wave pulse widths of MCU are input to as stabilization time, MCU can accurately calculate input according to stable pulse width time
Voltage, because high pressure pulsewidth AC220V detection circuits detection 220V voltage values are accurate, in main electricity AC220V disconnections or ＜ AC180V,
Quickly (＜ 10ms) standby electricity output can be transformed into；In main electricity >=AC180V, quickly (＜ 10ms) main electricity output can be transformed into.It can
Fully meet national standard.
What deserves to be explained is it is created although foregoing teachings describe the utility model by reference to several specific embodiments
Spirit and principle, it should be appreciated that, the utility model is not limited to disclosed specific embodiment, and each side is drawn
Divide and also do not mean that the feature in these aspects cannot combine, this division is merely to the convenience of statement.The utility model purport
Covering various modifications and equivalent arrangements included in spirit and scope of the appended claims.
Claims (2)
1. a kind of AC220V voltage detecting circuits for fire-fighting equipment power supply, including MCU, which is characterized in that the detection circuit
Including rectifier bridge BD1, rectifier bridge BD1 input terminals connect the voltage of AC220V to be detected,
The both ends of rectifier bridge BD1 outputs connect voltage-stabiliser tube ZD1 and voltage-stabiliser tube ZD2, wherein rectifier bridge BD1 by current-limiting resistance respectively
Output cathode passes through the cathode of resistance R1 connection voltage-stabiliser tubes ZD1, and rectifier bridge BD1 output negative poles pass through resistance R3 connection voltage-stabiliser tubes
The anode of ZD2, the anode of voltage-stabiliser tube ZD1 pass through the input anode of resistance R2 connection optocouplers U1, and the cathode of voltage-stabiliser tube ZD2 passes through
The input cathode of resistance R4 connection optocouplers U1,
The IO input pins of the collector connection MCU of optocoupler U1 output terminals, the emitter ground connection of optocoupler U1 output terminals.
2. the AC220V voltage detecting circuits of fire-fighting equipment power supply to be used for as described in claim 1, which is characterized in that MCU's
IO output pins connect active and standby power conversion circuit, and main power source 24V accesses active and standby power conversion circuit, and 24V battery packs access active and standby electricity
Conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721476881.XU CN207396699U (en) | 2017-11-08 | 2017-11-08 | A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721476881.XU CN207396699U (en) | 2017-11-08 | 2017-11-08 | A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply |
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| Publication Number | Publication Date |
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| CN207396699U true CN207396699U (en) | 2018-05-22 |
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| CN201721476881.XU Active CN207396699U (en) | 2017-11-08 | 2017-11-08 | A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728082A (en) * | 2017-11-08 | 2018-02-23 | 柏宜照明（上海）股份有限公司 | A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply |
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2017
- 2017-11-08 CN CN201721476881.XU patent/CN207396699U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728082A (en) * | 2017-11-08 | 2018-02-23 | 柏宜照明（上海）股份有限公司 | A kind of AC220V voltage detecting circuits for fire-fighting equipment power supply |
| CN107728082B (en) * | 2017-11-08 | 2023-12-29 | 柏宜照明（上海）股份有限公司 | AC220V voltage detection circuit for fire-fighting equipment power supply |
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