CN205389097U - Ferroelectric phase preface in municipality detects protection circuit - Google Patents
Ferroelectric phase preface in municipality detects protection circuit Download PDFInfo
- Publication number
- CN205389097U CN205389097U CN201620091272.1U CN201620091272U CN205389097U CN 205389097 U CN205389097 U CN 205389097U CN 201620091272 U CN201620091272 U CN 201620091272U CN 205389097 U CN205389097 U CN 205389097U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- diode
- phase
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Rectifiers (AREA)
Abstract
The utility model provides a ferroelectric phase preface in municipality detects protection circuit, relates to commercial power protection circuit technical field, and its circuit includes reduction voltage circuit, rectifier circuit, comparison circuit and switch circuit, and the reduction voltage circuit steps down to the three -phase commercial power, and rectifier circuit carries out the rectification to the voltage after stepping down, and voltage after the rectification is delivered to comparison circuit and reference voltage and is carried out the comparison, and the comparative result of comparison circuit output is used for controlling whether external output of commercial power through control switch circuit, the utility model discloses when the phase sequence is correct, the voltage of three -phase commercial power after the reduction voltage circuit steps down is higher, voltage ratio reference voltage after the rectification is high, event comparison circuit passes through the normal external output of control switch circuit control commercial power, otherwise, when the phase sequence mistake, the voltage of three -phase commercial power after the reduction voltage circuit steps down is lower, voltage ratio reference voltage after the rectification is low, event comparison circuit stops external output through the control switch circuit control commercial power, the electromechanical damage and the reduction occurence of failure appears with reduction equipment.
Description
Technical field
This utility model relates to electric protection circuit engineering field, city, particularly relates to a kind of civil power Phase sequence detection protection circuit.
Background technology
The input of present powerful device is all without carrying out Phase sequence detection or detection process is more complicated; cause detection inaccurate or relatively costly; if some equipment phase sequence mistakes arise that dynamo-electric damage or cause that accident occurs; ammeter is calculated and also can have a great impact etc. by phase sequence mistake, therefore needs equipment input is increased Phase sequence detection protection.
Utility model content
The purpose of this utility model is in that to avoid weak point of the prior art to provide a kind of civil power Phase sequence detection to protect circuit, and this civil power Phase sequence detection protection circuit can reduce equipment and occur that electromechanics damages one and the generation of minimizing accident.
The purpose of this utility model is achieved through the following technical solutions:
A kind of civil power Phase sequence detection protection circuit is provided; including reduction voltage circuit, rectification circuit, comparison circuit and on-off circuit; three-phase mains is carried out blood pressure lowering by reduction voltage circuit; voltage after blood pressure lowering is carried out rectification by rectification circuit; voltage after rectification is delivered to comparison circuit and is compared with reference voltage, and the comparative result of comparison circuit output is through controlling on-off circuit in order to control whether civil power externally exports.
Described reduction voltage circuit includes being connected to the first resistance of civil power A phase, being connected to the second resistance of civil power B phase and be connected to the 3rd resistance of civil power C phase.
Described first resistance includes the resistance R5 and resistance R6 of concatenation, and described second resistance includes the resistance R3 and resistance R4 of concatenation, and described 3rd resistance includes the resistance R1 and resistance R2 of concatenation.
Described rectification circuit includes diode D1, diode D2, diode D3 and diode D4, the positive pole of diode D1 and the equal ground connection of positive pole of diode D2, the negative pole of diode D1 connects the C phase of the second resistance of reduction voltage circuit, the positive pole of diode D4 and civil power, the negative pole of diode D2 connects the positive pole of diode D3, the first resistance of reduction voltage circuit and the 3rd resistance, the negative pole of the negative pole of diode D3 and diode D4 connects, and the contact between negative pole and the negative pole of diode D4 of diode D3 is connected to the input of comparison circuit as the outfan of rectification circuit.
Described comparison circuit includes comparator U1, resistance R7, resistance R8, resistance R9, resistance R10 and resistance R11, the positive input terminal of comparator U1 meets power supply VCC through resistance R10, the positive input terminal of comparator U1 is through resistance R11 ground connection, the negative input end of comparator U1 connects the outfan of rectification circuit through resistance R7, the negative input end of comparator U1 is through resistance R8 ground connection, and the negative input end of comparator U1 connects the outfan of comparator U1 through resistance R9.
Described on-off circuit includes audion Q1, relay J Q1 and for controlling the A.C. contactor KM1 whether three-phase mains externally exports, the base stage of audion Q1 connects the outfan of comparison circuit, the grounded emitter of audion Q1, one end of the coil of the collector connecting relay JQ1 of audion Q1, another termination power VCC of the coil of relay J Q1, the C phase of one termination three-phase mains of the switch of relay J Q1, one end of the coil of another termination A.C. contactor KM1 of the switch of relay J Q1, another terminal connecting zero line N of the coil of A.C. contactor KM1.
It is connected to electric capacity C1 between C phase and the negative pole of diode D1 of described civil power.
It is connected to LED 1 and resistance R12 between colelctor electrode and the power supply VCC of described audion Q1, the negative pole of described LED 1 connects the colelctor electrode of audion Q1, one end of the positive pole connecting resistance R12 of described LED 1, another termination power VCC of resistance R12.
The beneficial effects of the utility model:
nullA kind of civil power Phase sequence detection protection circuit of the present utility model，Including reduction voltage circuit、Rectification circuit、Comparison circuit and on-off circuit，Three-phase mains is carried out blood pressure lowering by reduction voltage circuit，Voltage after blood pressure lowering is carried out rectification by rectification circuit，Voltage after rectification is delivered to comparison circuit and is compared with reference voltage，The comparative result of comparison circuit output is through controlling on-off circuit in order to control whether civil power externally exports，This utility model voltage after rectifier circuit rectifies and reference voltage are compared by comparison circuit，When phase sequence is correct，Three-phase mains voltage after reduction voltage circuit blood pressure lowering is higher，Voltage ratio reference voltage after rectified is high，Therefore comparison circuit normally externally exports by controlling on-off circuit control civil power，Otherwise，When phase sequence mistake，Three-phase mains voltage after reduction voltage circuit blood pressure lowering is relatively low，Voltage ratio reference voltage after rectified is low，Therefore comparison circuit controls civil power stopping externally output by controlling on-off circuit，To reduce equipment appearance electromechanics damage and the generation of minimizing accident.
Accompanying drawing explanation
Utilize accompanying drawing that utility model is described further, but the embodiment in accompanying drawing does not constitute any restriction of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the following drawings.
Fig. 1 is the overall structure schematic diagram of a kind of civil power Phase sequence detection of the present utility model protection circuit.
Detailed description of the invention
With the following Examples this utility model is further described.
A kind of civil power Phase sequence detection protection circuit of the present embodiment; including reduction voltage circuit, rectification circuit, comparison circuit and on-off circuit; three-phase mains is carried out blood pressure lowering by reduction voltage circuit; voltage after blood pressure lowering is carried out rectification by rectification circuit; voltage after rectification is delivered to comparison circuit and is compared with reference voltage, and the comparative result of comparison circuit output is through controlling on-off circuit in order to control whether civil power externally exports.
Described reduction voltage circuit includes being connected to the first resistance of civil power A phase, being connected to the second resistance of civil power B phase and be connected to the 3rd resistance of civil power C phase.
As it is shown in figure 1, described first resistance includes the resistance R5 and resistance R6 of concatenation, described second resistance includes the resistance R3 and resistance R4 of concatenation, and described 3rd resistance includes the resistance R1 and resistance R2 of concatenation.
Described rectification circuit includes diode D1, diode D2, diode D3 and diode D4, the positive pole of diode D1 and the equal ground connection of positive pole of diode D2, the negative pole of diode D1 connects the C phase of the second resistance of reduction voltage circuit, the positive pole of diode D4 and civil power, the negative pole of diode D2 connects the positive pole of diode D3, the first resistance of reduction voltage circuit and the 3rd resistance, the negative pole of the negative pole of diode D3 and diode D4 connects, and the contact between negative pole and the negative pole of diode D4 of diode D3 is connected to the input of comparison circuit as the outfan of rectification circuit.
Described comparison circuit includes comparator U1, resistance R7, resistance R8, resistance R9, resistance R10 and resistance R11, the positive input terminal of comparator U1 meets power supply VCC through resistance R10, the positive input terminal of comparator U1 is through resistance R11 ground connection, the negative input end of comparator U1 connects the outfan of rectification circuit through resistance R7, the negative input end of comparator U1 is through resistance R8 ground connection, and the negative input end of comparator U1 connects the outfan of comparator U1 through resistance R9.
Described on-off circuit includes audion Q1, relay J Q1 and for controlling the A.C. contactor KM1 whether three-phase mains externally exports, the base stage of audion Q1 connects the outfan of comparison circuit, the grounded emitter of audion Q1, one end of the coil of the collector connecting relay JQ1 of audion Q1, another termination power VCC of the coil of relay J Q1, the C phase of one termination three-phase mains of the switch of relay J Q1, one end of the coil of another termination A.C. contactor KM1 of the switch of relay J Q1, another terminal connecting zero line N of the coil of A.C. contactor KM1.
Being connected to electric capacity C1 between C phase and the negative pole of diode D1 of described civil power, electric capacity C1 plays phase shift effect.
It is connected to LED 1 and resistance R12 between colelctor electrode and the power supply VCC of described audion Q1, the negative pole of described LED 1 connects the colelctor electrode of audion Q1, one end of the positive pole connecting resistance R12 of described LED 1, another termination power VCC of resistance R12.
The operation principle of above circuit is as follows:
When three-phase mains phase sequence is correct, three-phase mains is through dropping resistor and shift capacitor C1 to rectification circuit, now voltage is higher, voltage after rectifier circuit rectifies is through resistance R7, (VCC is through R10 to deliver to the reference voltage of the voltage of positive input terminal of the comparator U1 negative input end less than comparator U1 after R8 dividing potential drop, voltage after R11 dividing potential drop), therefore the 2 foot voltages of comparator U1 are more than 3 foot voltages, the 1 foot output low level of comparator U1, now audion Q1 is not turned on, relay J Q1 is not turned on, now LED 1 does not work luminescence, now civil power C communicated the normally-closed contact 3 of relay JQ1, 4 feet are to the coil of main circuit A.C. contactor KM1, three-phase mains is externally output as load supplying, loaded work piece is normal.
When three-phase phase sequence is incorrect, three-phase electricity is through voltage reducing resistor and shift capacitor C1 to rectifier bridge, now voltage is relatively low, voltage after rectifier bridge rectification is through R7, (VCC is through R10 to deliver to the reference voltage of the voltage of positive input terminal of the comparator U1 negative input end less than comparator U1 after R8 dividing potential drop, voltage after R11 dividing potential drop), therefore the 2 foot voltages of comparator U1 are less than 3 foot voltages, the 1 foot output high level of comparator U1, now audion Q1 conducting, relay J Q1 turns on, the normally-closed contact 3 of relay, 4 feet disconnect, now civil power C phase cannot pass through the contact 3 of relay J Q1, 4 feet are to the coil of A.C. contactor KM1, three-phase mains is supplying power for outside not, load is now without electricity, thus playing protection load effect.Now LED 1 luminescence is to remind phase sequence mistake.
A kind of civil power Phase sequence detection protection circuit of the present embodiment, voltage and reference voltage after rectifier circuit rectifies are compared by comparison circuit, when phase sequence is correct, three-phase mains voltage after reduction voltage circuit blood pressure lowering is higher, voltage ratio reference voltage after rectified is high, therefore comparison circuit normally externally exports by controlling on-off circuit control civil power, otherwise, when phase sequence mistake, three-phase mains voltage after reduction voltage circuit blood pressure lowering is relatively low, voltage ratio reference voltage after rectified is low, therefore comparison circuit controls civil power stopping externally output by controlling on-off circuit, to reduce equipment appearance electromechanics damage and the generation of minimizing accident.
Finally should be noted that; above example is only in order to illustrate the technical solution of the utility model; but not the restriction to this utility model protection domain; although having made to explain to this utility model with reference to preferred embodiment; it will be understood by those within the art that; the technical solution of the utility model can be modified or equivalent replacement, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (8)
1. a civil power Phase sequence detection protection circuit; it is characterized in that: include reduction voltage circuit, rectification circuit, comparison circuit and on-off circuit; three-phase mains is carried out blood pressure lowering by reduction voltage circuit; voltage after blood pressure lowering is carried out rectification by rectification circuit; voltage after rectification is delivered to comparison circuit and is compared with reference voltage, and the comparative result of comparison circuit output is through controlling on-off circuit in order to control whether civil power externally exports.
2. a kind of civil power Phase sequence detection protection circuit as claimed in claim 1, it is characterised in that: described reduction voltage circuit includes being connected to the first resistance of civil power A phase, being connected to the second resistance of civil power B phase and be connected to the 3rd resistance of civil power C phase.
3. a kind of civil power Phase sequence detection protection circuit as claimed in claim 2; it is characterized in that: described first resistance includes the resistance R5 and resistance R6 of concatenation; described second resistance includes the resistance R3 and resistance R4 of concatenation, and described 3rd resistance includes the resistance R1 and resistance R2 of concatenation.
4. a kind of civil power Phase sequence detection protection circuit as claimed in claim 2, it is characterized in that: described rectification circuit includes diode D1, diode D2, diode D3 and diode D4, the positive pole of diode D1 and the equal ground connection of positive pole of diode D2, the negative pole of diode D1 connects the second resistance of reduction voltage circuit, the positive pole of diode D4 and the C phase of civil power, the negative pole of diode D2 connects the positive pole of diode D3, first resistance of reduction voltage circuit and the 3rd resistance, the negative pole of diode D3 and the negative pole of diode D4 connect, contact between negative pole and the negative pole of diode D4 of diode D3 is connected to the input of comparison circuit as the outfan of rectification circuit.
5. a kind of civil power Phase sequence detection protection circuit as claimed in claim 1 or 2 or 3 or 4; it is characterized in that: described comparison circuit includes comparator U1, resistance R7, resistance R8, resistance R9, resistance R10 and resistance R11; the positive input terminal of comparator U1 meets power supply VCC through resistance R10; the positive input terminal of comparator U1 is through resistance R11 ground connection; the negative input end of comparator U1 connects the outfan of rectification circuit through resistance R7; the negative input end of comparator U1 is through resistance R8 ground connection, and the negative input end of comparator U1 connects the outfan of comparator U1 through resistance R9.
6. a kind of civil power Phase sequence detection protection circuit as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: described on-off circuit includes audion Q1, relay J Q1 and for controlling the A.C. contactor KM1 whether three-phase mains externally exports, the base stage of audion Q1 connects the outfan of comparison circuit, the grounded emitter of audion Q1, one end of the coil of the collector connecting relay JQ1 of audion Q1, another termination power VCC of the coil of relay J Q1, the C phase of one termination three-phase mains of the switch of relay J Q1, one end of the coil of another termination A.C. contactor KM1 of the switch of relay J Q1, another terminal connecting zero line N of the coil of A.C. contactor KM1.
7. a kind of civil power Phase sequence detection protection circuit as claimed in claim 4, it is characterised in that: it is connected to electric capacity C1 between C phase and the negative pole of diode D1 of described civil power.
8. a kind of civil power Phase sequence detection protection circuit as claimed in claim 6; it is characterized in that: between colelctor electrode and the power supply VCC of described audion Q1, be connected to LED 1 and resistance R12; the negative pole of described LED 1 connects the colelctor electrode of audion Q1; one end of the positive pole connecting resistance R12 of described LED 1, another termination power VCC of resistance R12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620091272.1U CN205389097U (en) | 2016-01-29 | 2016-01-29 | Ferroelectric phase preface in municipality detects protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620091272.1U CN205389097U (en) | 2016-01-29 | 2016-01-29 | Ferroelectric phase preface in municipality detects protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205389097U true CN205389097U (en) | 2016-07-20 |
Family
ID=56382434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620091272.1U Active CN205389097U (en) | 2016-01-29 | 2016-01-29 | Ferroelectric phase preface in municipality detects protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205389097U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107909992A (en) * | 2017-12-04 | 2018-04-13 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system of powered stable |
| CN112928745A (en) * | 2021-01-25 | 2021-06-08 | 常熟理工学院 | Phase sequence protection circuit based on phase shift principle |
-
2016
- 2016-01-29 CN CN201620091272.1U patent/CN205389097U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107909992A (en) * | 2017-12-04 | 2018-04-13 | 成都星达微科技有限公司 | A kind of campus dormitory active noise reduction system of powered stable |
| CN112928745A (en) * | 2021-01-25 | 2021-06-08 | 常熟理工学院 | Phase sequence protection circuit based on phase shift principle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201590645U (en) | AC input over-voltage and under-voltage protection device for electric apparatus | |
| CN203026918U (en) | Input over-voltage protection circuit of smart grid terminal power supply | |
| CN104422806A (en) | Power detection circuit | |
| CN103166175A (en) | Input overvoltage protection circuit for light-emitting diode (LED) driving power supply | |
| CN205304229U (en) | Relay control protection electric circuit and tame electric installation | |
| CN205389097U (en) | Ferroelectric phase preface in municipality detects protection circuit | |
| CN205453116U (en) | Survival voltage bleeder circuit and electric rice cooker | |
| CN200976485Y (en) | Under-voltage protection circuitry | |
| CN203439864U (en) | Elevator control cabinet | |
| CN205721473U (en) | A kind of Multifunctional AC power regulation circuit | |
| CN201263079Y (en) | Under-voltage protection circuit, power supply circuit and television set | |
| CN104418194A (en) | Elevator control cabinet | |
| CN204559106U (en) | A kind of convertible frequency air-conditioner and electrolytic capacitor overvoltage crowbar thereof | |
| CN204681075U (en) | Power-down protection circuit | |
| CN202649723U (en) | Novel self-start controller for use after power recovery of air conditioner | |
| CN103944139B (en) | The decompression delayer of breaker is under-voltage coil | |
| CN203733719U (en) | Full wave resistive and capacitive voltage reduction relay drive circuit | |
| CN204061258U (en) | A kind of atmospheric pollution automatic air-exchanging circuit | |
| CN102645901B (en) | Stand-by circuit | |
| CN108768357B (en) | High-low voltage automatic switching electronic switch circuit | |
| CN202600030U (en) | High-voltage live displaying and blocking device | |
| CN106026016B (en) | A kind of capacitance-resistance step down type undervoltage tripping protection circuit | |
| CN220603574U (en) | Input voltage detection circuit, switching power supply control chip and switching power supply | |
| CN205566256U (en) | Alternating load isolation control circuit | |
| CN205376403U (en) | Undervoltage protection ware is crossed to relay drive circuit and self -resuming formula |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |