CN207926158U - Alternating current power failure monitoring and protecting circuit for steam power plant - Google Patents
Alternating current power failure monitoring and protecting circuit for steam power plant Download PDFInfo
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- CN207926158U CN207926158U CN201820412582.8U CN201820412582U CN207926158U CN 207926158 U CN207926158 U CN 207926158U CN 201820412582 U CN201820412582 U CN 201820412582U CN 207926158 U CN207926158 U CN 207926158U
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Abstract
For the alternating current power failure monitoring and protecting circuit of steam power plant, belong to the power supply monitoring field of power plant, the utility model is to solve the problems, such as that AC power power down leads to safety accident.The utility model includes NE555 time-base integrated circuits, comparator A, optocoupler, resistance R1~R4, adjustable resistance R5, diode D1~D3, zener diode Vs1~Vs2, electrolytic capacitor C1, capacitance C2 and light emitting diode VL；AC power AC is DC power supply through diode D1 rectifications; Phototube Coupling is carried out through optocoupler to be input in comparator A; when power was lost, comparator A exports low level and triggers NE555, and NE555 output high level starts light indicating circuit and the action of subsequent execution unit to protect key equipment.
Description
Technical field
The utility model belongs to the power supply monitoring field of power plant, is related to AC power monitoring and protection technique.
Background technology
Steam power plant has the function of power generation and heat supply two major parts, and the electrical equipment in steam power plant is numerous, due to the pass of steam power plant
Button apparatus is more, and crucial setting all has continuous non-stop run characteristic, therefore it is required that electrical source of power also wants without interruption, if dynamic
The unexpected power down of power electricity, will produce great impact, and data when power down cannot preserve in time to the equipment being much currently running；
If power down cannot find and handle in time, even more serious safety accident may be caused.
In most of electrical equipments powered using AC power, in input ac power power down, need quickly
It detects the signal of exchange input power down, and necessary protection is carried out to equipment, to ensure the normal work of electrical equipment.Especially
Be for key equipment, with greater need for as early as possible detect the signal of AC dump, and detection circuit malfunction is avoided to lead to equipment
Abnormal operation.
Invention content
The utility model aim has been to provide for a kind of alternating current power failure monitoring and protecting circuit for steam power plant, in order to avoid
The generation of safety accident.
Basis set is at electricity when alternating current power failure monitoring and protecting circuit described in the utility model for steam power plant includes NE555
Road, comparator A, optocoupler, resistance R1~R4, adjustable resistance R5, diode D1~D3, zener diode Vs1~Vs2, electrolysis electricity
Hold C1, capacitance C2 and light emitting diode VL；
Optocoupler is made of light emitting diode D2 and phototriode VT；
One end of AC power AC connects the anode of the diode D2 of optocoupler by concatenated diode D1 with resistance R1；It hands over
The cathode of the other end connection diode D2 of galvanic electricity source AC；
The emitter of the collector connection+5V DC power supplies of phototriode VT, phototriode VT connects voltage stabilizing simultaneously
The anode of the cathode and diode D3 of diode Vs1；The plus earth of zener diode Vs1；
The cathode of diode D3 connects anode and one end of resistance R2 of electrolytic capacitor C1 simultaneously；The cathode of electrolytic capacitor C1
Ground connection；
The other end of resistance R2 connect simultaneously the in-phase input end of comparator A, a fixing end of adjustable resistance R5 and its
Sliding end；Another fixing end of adjustable resistance R5 is grounded；
The inverting input of comparator A connects the cathode of one end and zener diode Vs2 of resistance R3, two pole of voltage stabilizing simultaneously
The plus earth of pipe Vs2, the other end connection+5V DC power supplies of resistance R3；
The output end of comparator A connects 2 feet of NE555 time-base integrated circuits, one end of 6 feet and resistance R4 simultaneously；NE555
The other end of 4 feet of time-base integrated circuit, 8 feet and resistance R4 connects+5V DC power supplies simultaneously；The 5 of NE555 time-base integrated circuits
Foot is grounded by capacitance C2, the 1 foot ground connection of NE555 time-base integrated circuits；The 3 feet connection luminous two of NE555 time-base integrated circuits
The anode of pole pipe VL, the minus earth of light emitting diode VL.
Preferably, further include intermediate relay KA, when the both ends of intermediate relay KA coils are separately connected NE555 basis set at
3 feet and power ground of circuit, the contact series of intermediate relay KA are in the current supply circuit of execution unit.
Preferably, comparator A uses LM393 twin voltage comparator integrated circuits.
The beneficial effects of the utility model：The utility model circuit structure is simple, is built using several analog elements, no journey
Sequence is embedded in, and fast and effectively detects AC power power down, and provides instruction rapidly as a result, and enabling execution unit action to protect
Protect corresponding electrical equipment.
Description of the drawings
Fig. 1 is the structural schematic diagram of the alternating current power failure monitoring and protecting circuit described in the utility model for steam power plant.
Specific implementation mode
Specific implementation mode one：It illustrates in conjunction with Fig. 1, is supervised for the alternating current power failure of steam power plant described in present embodiment
Survey protection circuit include NE555 time-base integrated circuits, comparator A, optocoupler, resistance R1~R4, adjustable resistance R5, diode D1~
D3, zener diode Vs1~Vs2, electrolytic capacitor C1, capacitance C2, light emitting diode VL and intermediate relay KA；
Optocoupler is made of light emitting diode D2 and phototriode VT；
One end of AC power AC connects the anode of the diode D2 of optocoupler by concatenated diode D1 with resistance R1；It hands over
The cathode of the other end connection diode D2 of galvanic electricity source AC；
The emitter of the collector connection+5V DC power supplies of phototriode VT, phototriode VT connects voltage stabilizing simultaneously
The anode of the cathode and diode D3 of diode Vs1；The plus earth of zener diode Vs1；
The cathode of diode D3 connects anode and one end of resistance R2 of electrolytic capacitor C1 simultaneously；The cathode of electrolytic capacitor C1
Ground connection；
The other end of resistance R2 connect simultaneously the in-phase input end of comparator A, a fixing end of adjustable resistance R5 and its
Sliding end；Another fixing end of adjustable resistance R5 is grounded；
The inverting input of comparator A connects the cathode of one end and zener diode Vs2 of resistance R3, two pole of voltage stabilizing simultaneously
The plus earth of pipe Vs2, the other end connection+5V DC power supplies of resistance R3；
The output end of comparator A connects 2 feet of NE555 time-base integrated circuits, one end of 6 feet and resistance R4 simultaneously；NE555
The other end of 4 feet of time-base integrated circuit, 8 feet and resistance R4 connects+5V DC power supplies simultaneously；The 5 of NE555 time-base integrated circuits
Foot is grounded by capacitance C2, the 1 foot ground connection of NE555 time-base integrated circuits；The 3 feet connection luminous two of NE555 time-base integrated circuits
The anode of pole pipe VL, the minus earth of light emitting diode VL.
The both ends of intermediate relay KA coils are separately connected 3 feet and power ground of NE555 time-base integrated circuits, intermediate relay
The contact series of device KA are in the current supply circuit of execution unit.
Operation principle：AC power AC, for example for 220V or be 380V etc., it is DC power supply, warp through diode D1 rectifications
Optocoupler carries out Phototube Coupling makes subsequent conditioning circuit effectively export triggering command using light-coupled isolation front stage circuit.Then through Vs1,
The "+" end of comparator A is input to after D3, C1, R2, R5 are smooth, the input value at the "-" end of comparator A is the value of Vs2, adjusts R5
So that the waveform minimum point at "+" end is more slightly higher 0.1~0.2V than the input value at "-" end, and when normal power supply, the high electricity of comparator A outputs
It puts down, the 6 foot input high levels of NE555, then its 3 foot exports low level, VL, KA all attonitys.When AC power AC power down, than
"+" terminal voltage compared with device A is less than "-" terminal voltage, and comparator A exports low level, then 2 feet of NE555 access low level, NE555
Inside overturning, 3 feet of NE555 export high level, and VL is bright to characterize power-down state, meanwhile, KA coils obtain electric, the contact series of KA
In the current supply circuit of execution unit, after KA coils obtain electric, corresponding each contact can act, and enable execution unit generate corresponding
Action protect key equipment.
Although the embodiment disclosed by the utility model is as above, the content is only to facilitate understand this practicality
Novel and use embodiment, is not limited to the utility model.Skill in any the utility model technical field
Art personnel can be in the formal and details of implementation under the premise of not departing from the spirit and scope disclosed by the utility model
On make any modification and variation, but the scope of patent protection of the utility model, must still be defined with appended claims
Range subject to.
Claims (3)
1. the alternating current power failure monitoring and protecting circuit for steam power plant, which is characterized in that including NE555 time-base integrated circuits, ratio
Compared with device A, optocoupler, resistance R1~R4, adjustable resistance R5, diode D1~D3, zener diode Vs1~Vs2, electrolytic capacitor C1,
Capacitance C2 and light emitting diode VL；
Optocoupler is made of light emitting diode D2 and phototriode VT；
One end of AC power AC connects the anode of the diode D2 of optocoupler by concatenated diode D1 with resistance R1；Alternating current
The cathode of the other end connection diode D2 of source AC；
The emitter of the collector connection+5V DC power supplies of phototriode VT, phototriode VT connects two pole of voltage stabilizing simultaneously
The anode of the cathode and diode D3 of pipe Vs1；The plus earth of zener diode Vs1；
The cathode of diode D3 connects anode and one end of resistance R2 of electrolytic capacitor C1 simultaneously；The cathode of electrolytic capacitor C1 connects
Ground；
The other end of resistance R2 connects the in-phase input end of comparator A, a fixing end of adjustable resistance R5 and its sliding simultaneously
End；Another fixing end of adjustable resistance R5 is grounded；
The inverting input of comparator A connects the cathode of one end and zener diode Vs2 of resistance R3, zener diode simultaneously
The plus earth of Vs2, the other end connection+5V DC power supplies of resistance R3；
The output end of comparator A connects 2 feet of NE555 time-base integrated circuits, one end of 6 feet and resistance R4 simultaneously；Base when NE555
The other end of 4 feet of integrated circuit, 8 feet and resistance R4 connects+5V DC power supplies simultaneously；5 feet of NE555 time-base integrated circuits are logical
Cross capacitance C2 ground connection, the 1 foot ground connection of NE555 time-base integrated circuits；3 feet of NE555 time-base integrated circuits connect light emitting diode
The anode of VL, the minus earth of light emitting diode VL.
2. being used for the alternating current power failure monitoring and protecting circuit of steam power plant according to claim 1, which is characterized in that in further including
Between relay KA, the both ends of intermediate relay KA coils are separately connected 3 feet and power ground of NE555 time-base integrated circuits, intermediate
The contact series of relay KA are in the current supply circuit of execution unit.
3. being used for the alternating current power failure monitoring and protecting circuit of steam power plant according to claim 1, which is characterized in that comparator A
Using LM393 twin voltage comparator integrated circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820412582.8U CN207926158U (en) | 2018-03-26 | 2018-03-26 | Alternating current power failure monitoring and protecting circuit for steam power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820412582.8U CN207926158U (en) | 2018-03-26 | 2018-03-26 | Alternating current power failure monitoring and protecting circuit for steam power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207926158U true CN207926158U (en) | 2018-09-28 |
Family
ID=63596173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820412582.8U Expired - Fee Related CN207926158U (en) | 2018-03-26 | 2018-03-26 | Alternating current power failure monitoring and protecting circuit for steam power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207926158U (en) |
-
2018
- 2018-03-26 CN CN201820412582.8U patent/CN207926158U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180928 Termination date: 20190326 |