CN207732411U - A kind of open-phase protection circuit - Google Patents
A kind of open-phase protection circuit Download PDFInfo
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- CN207732411U CN207732411U CN201721901477.2U CN201721901477U CN207732411U CN 207732411 U CN207732411 U CN 207732411U CN 201721901477 U CN201721901477 U CN 201721901477U CN 207732411 U CN207732411 U CN 207732411U
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Abstract
The utility model is related to a kind of open-phase protection circuits; when three-phase input phase shortage; then controlling energy-storage travelling wave tube electric discharge, level conversion is low level output so that the height of the first comparison circuit output interlocks; the low level output is for triggering open-phase protection mechanism; staggeredly level fluctuated is avoided the occurrence of to damage electrical equipment; it realizes open-phase protection, can not be damaged with the electrical equipment of effective protection user.
Description
Technical field
The utility model is related to circuit field, more particularly to a kind of open-phase protection circuit.
Background technology
Three phase supply is widely used in various electrical equipments, if occurring line fault or use in use
Mistake, when phase shortage occurs in three-phase input voltage, original electrical equipment can reduce output power so that it can not work normally
Or cause the accident, power supply must be disconnected repairing in this way, being constituted on the normal use of user influences, and is brought greatly not to user
Just.
Utility model content
Technical problem to be solved in the utility model is：A kind of open-phase protection circuit is provided, when three-phase input voltage goes out
When existing phase shortage, ensure that the electrical equipment of user is not damaged.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is：A kind of open-phase protection circuit, setting
Between three-phase input end and open-phase protection output end, the open-phase protection circuit includes the rectification circuit being sequentially connected, exchange
Sample circuit, the first comparison circuit, charge-discharge circuit and the second comparison circuit；
First comparison circuit includes the first input end being connected with alternating current sampling circuit and the second input terminal, the second ratio
Include third input terminal and the 4th input terminal compared with circuit；
The open-phase protection circuit further include for the first comparison circuit the second input terminal and the second comparison circuit the 4th
Input terminal provides the reference voltage source of reference voltage；
First comparison circuit is obtained for the collected voltage of alternating current sampling circuit to be compared with reference voltage
Output level, and output level is passed through to the third input terminal of the second comparison circuit；
The charge-discharge circuit includes DC power supply and energy-storage travelling wave tube, one end of the energy-storage travelling wave tube and the first comparison circuit
Output end is connected, and the other end ground connection of the energy-storage travelling wave tube, when three-phase input voltage is normal, DC power supply is filled to energy-storage travelling wave tube
One end of electricity, energy-storage travelling wave tube is high level, and when phase shortage occurs in three-phase input voltage, energy-storage travelling wave tube is put rapidly by being full of electricity condition
One end of electricity, energy-storage travelling wave tube is low level；
Second comparison circuit exports phase shortage for the level of one end of energy-storage travelling wave tube to be compared with reference voltage
Protect level.
Further, first comparison circuit includes first comparator, the output end of the first comparator and energy storage
One end of element is connected.
Further, the charge-discharge circuit includes first resistor, the first capacitance and DC power supply, the first resistor
One end is connected with DC power supply, and the other end of the first resistor is connected with one end of first capacitance, first capacitance
One end be connected with the output end of first comparator, the other end of first capacitance ground connection.
Further, the charging time of the charge-discharge circuit is 1-10 seconds.
Further, further include protecting circuit, the protection circuit is filled for increasing when three-phase input end is initially powered
The charge rate of discharge circuit is 2-5 times of standard charging rate.
Further, the protection circuit includes second resistance, the second capacitance and the first triode, first triode
Ground level be connected respectively with one end of one end of second resistance and the second capacitance, the emitting stage of first triode and described the
The other end of two resistance is connected, and the other end of the second resistance is connected with DC power supply, the emitting stage of first triode
It is connected with the other end of second capacitance, the other end of second capacitance is connected with one end of the first capacitance.
Further, second comparison circuit includes 3rd resistor and the second comparator, and the of second comparator
Three input terminals are connected by 3rd resistor with one end of the first capacitance, the 4th input terminal and reference voltage of second comparator
It is connected, the output end of second comparator exports open-phase protection level.
The beneficial effects of the utility model are：When three-phase input is normal, DC power supply charges to energy-storage travelling wave tube, exchange
The collected voltage of sample circuit is bigger than reference voltage, and the output level of the first comparison circuit is high level, and the one of energy-storage travelling wave tube
End is high level, and the high level is more than reference voltage, then the output end of the first comparison circuit is high level；When three-phase input lacks
Xiang Shi, then controlling energy-storage travelling wave tube electric discharge, level conversion is low level output so that the height of the first comparison circuit output interlocks,
The low level output avoids the occurrence of staggeredly level fluctuated and is damaged to electrical equipment for triggering open-phase protection mechanism
It is bad, it realizes open-phase protection, can not be damaged with the electrical equipment of effective protection user.
Description of the drawings
Fig. 1 is the principle schematic according to a kind of open-phase protection circuit of the utility model；
Fig. 2 is the circuit diagram according to a kind of open-phase protection circuit of the utility model；
Fig. 3 is to be illustrated according to a kind of normal AC sampling waveform of three-phase input of open-phase protection circuit of the utility model
Figure；
Fig. 4 is to be illustrated according to a kind of AC sampling waveform of the three-phase input phase shortage of open-phase protection circuit of the utility model
Figure；
Label declaration：
1, rectification circuit；2, alternating current sampling circuit；3, the first comparison circuit；4, circuit is protected；5, the second comparison circuit；6、
Reference voltage source；R2, first resistor；R4, second resistance；R5,3rd resistor；C2, the first capacitance；C4, the second capacitance；Uv, base
Quasi- voltage.
Specific implementation mode
For technology contents, the objects and the effects of the utility model are described in detail, below in conjunction with embodiment and match
Attached drawing is closed to be explained.
The design of the utility model most critical is：If there are when phase shortage input, control energy storage member in three-phase input end
Part discharges so that the height of the first comparison circuit output interlocks level conversion for low level output, and the low level output is used for
Trigger open-phase protection mechanism.
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are please referred to, a kind of open-phase protection circuit is arranged defeated with open-phase protection in three-phase input end
Between outlet, the open-phase protection circuit include the rectification circuit 1 being sequentially connected, alternating current sampling circuit 2, the first comparison circuit 3,
Charge-discharge circuit 4 and the second comparison circuit 5；
First comparison circuit 3 includes the first input end being connected with alternating current sampling circuit 2 and the second input terminal, and second
Comparison circuit 5 includes third input terminal and the 4th input terminal；
The open-phase protection circuit further include for the first comparison circuit 3 the second input terminal and the second comparison circuit 5
Four input terminals provide the reference voltage source 6 of reference voltage；
First comparison circuit 3 is obtained for 2 collected voltage of alternating current sampling circuit to be compared with reference voltage
The output level arrived, and output level is passed through to the third input terminal of the second comparison circuit 5；
The charge-discharge circuit 4 includes DC power supply and energy-storage travelling wave tube, and one end of the energy-storage travelling wave tube and the first comparison are electric
The output end on road 3 is connected, and the other end ground connection of the energy-storage travelling wave tube, when three-phase input voltage is normal, DC power supply is to energy storage
Element charges, and one end of energy-storage travelling wave tube is high level, and when phase shortage occurs in three-phase input voltage, energy-storage travelling wave tube is by being full of electricity condition
One end of rapid electric discharge, energy-storage travelling wave tube is low level；
For the level of one end of energy-storage travelling wave tube to be compared with reference voltage, output lacks second comparison circuit 5
Mutually protection level.
As can be seen from the above description, the beneficial effects of the utility model are：When three-phase input is normal, DC power supply is to storage
Energy element charging, the collected voltage of alternating current sampling circuit is bigger than reference voltage, and the output level of the first comparison circuit is high electricity
Flat, one end of energy-storage travelling wave tube is high level, and the high level is more than reference voltage, then the output end of the first comparison circuit is high electricity
It is flat；When three-phase input phase shortage, then controlling energy-storage travelling wave tube electric discharge, level turns so that the height of the first comparison circuit output interlocks
It is changed to low level output, the low level output avoids the occurrence of staggeredly level fluctuated for triggering open-phase protection mechanism
Electrical equipment is damaged, open-phase protection is realized, can not be damaged with the electrical equipment of effective protection user.
Further, first comparison circuit includes first comparator, the output end of the first comparator and energy storage
One end of element is connected.
Seen from the above description, consider that comparator output current is small, pull-down current is big, and the first comparison circuit of the application is straight
Selecting comparator realizes that voltage compares.
Further, the charge-discharge circuit includes first resistor, the first capacitance and DC power supply, the first resistor
One end is connected with DC power supply, and the other end of the first resistor is connected with one end of first capacitance, first capacitance
One end be connected with the output end of first comparator, the other end of first capacitance ground connection.
Seen from the above description, the charging process to the first capacitance is realized by first resistor and DC power supply.
Further, the charging time of the charge-discharge circuit is 1-10 seconds.
Seen from the above description, the setting charging time is mainly based upon considering for three-phase input frequency, charging time herein
It needs to input 50-500 times of the period, it is ensured that phase shortage output level will not be fluctuated, to using equipment to damage.
Further, further include protecting circuit, the protection circuit is filled for increasing when three-phase input end is initially powered
The charge rate of discharge circuit is 2-5 times of standard charging rate.
Seen from the above description, the normal charging and discharging circuit charging time is 1-10 seconds, and setting protection circuit can make energy storage
Element quickly fills with electricity, and charge rate is 2-5 times of standard charging rate, when preventing three-phase input end from initially powering, phase shortage electricity
Road error starting.
Further, the protection circuit includes second resistance, the second capacitance and the first triode, first triode
Ground level be connected respectively with one end of one end of second resistance and the second capacitance, the emitting stage of first triode and described the
The other end of two resistance is connected, and the other end of the second resistance is connected with DC power supply, the emitting stage of first triode
It is connected with the other end of second capacitance, the other end of second capacitance is connected with one end of the first capacitance.
Seen from the above description, when three-phase input end is initially powered, the first triode ON is realized fast to energy-storage travelling wave tube
Speed charging, DC power supply are charged by the second capacitance of second resistance pair, the second capacitance discharge off circuit, therefore when three-phase is defeated
When entering to rectify often input or phase shortage input, the first triode is in closed state, will not charge again to the first capacitance.
Further, second comparison circuit includes 3rd resistor and the second comparator, and the of second comparator
Three input terminals are connected by 3rd resistor with one end of the first capacitance, the 4th input terminal and reference voltage of second comparator
It is connected, the output end of second comparator exports open-phase protection level.
Seen from the above description, 3rd resistor is the input resistance of the second comparator, and the second comparator passes through energy storage is first
The level and reference voltage of part one end are compared, and open-phase protection level is exported.
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are please referred to, the embodiments of the present invention are：
A kind of open-phase protection circuit is arranged between three-phase input end and open-phase protection output end, the open-phase protection electricity
Road includes that the rectification circuit 1 being sequentially connected, alternating current sampling circuit 2, the first comparison circuit 3, charge-discharge circuit 4 and the second comparison are electric
Road 5；
First comparison circuit 3 includes the first input end being connected with alternating current sampling circuit 2 and the second input terminal, and second
Comparison circuit 5 includes third input terminal and the 4th input terminal, and the first comparison circuit of the present embodiment uses first comparator；
The open-phase protection circuit further include for the first comparison circuit 3 the second input terminal and the second comparison circuit 5
Four input terminals provide the reference voltage source 6 of reference voltage；
First comparison circuit 3 is used to 2 collected voltage of alternating current sampling circuit being compared with reference voltage Uv,
Obtained output level, and output level is passed through to the third input terminal of the second comparison circuit 5；
The charge-discharge circuit 4 includes DC power supply and energy-storage travelling wave tube, and one end of the energy-storage travelling wave tube and the first comparison are electric
The output end on road 3 is connected, and the other end ground connection of the energy-storage travelling wave tube, when three-phase input voltage is normal, DC power supply is to energy storage
Element charges, and one end of energy-storage travelling wave tube is high level, and when phase shortage occurs in three-phase input voltage, energy-storage travelling wave tube is by being full of electricity condition
Rapid electric discharge, one end of energy-storage travelling wave tube are low level, and in the present embodiment, DC power supply uses 12V DC voltage, passes through the first electricity
Resistance R2 charges to the first capacitance C2, and the charging time is 1 second；
For the level of one end of energy-storage travelling wave tube to be compared with reference voltage, output lacks second comparison circuit 5
Mutually protection level；
Further include protection circuit, the protection circuit is for increasing charge-discharge circuit when three-phase input end is initially powered
Charge rate is 2-5 times of standard charging rate；The protection circuit includes second resistance R4, the second capacitance C4 and the one or three pole
Pipe Q1, the ground level of the first triode Q1 is connected with one end of one end of second resistance R4 and the second capacitance C4 respectively, described
The emitting stage of first triode Q1 is connected with the other end of the second resistance R4, the other end and direct current of the second resistance R4
Power supply 12V is connected, and the emitting stage of the first triode Q1 is connected with the other end of the second capacitance C4, second capacitance
The other end of C4 is connected with one end of the first capacitance C2；
Second comparison circuit includes 3rd resistor R5 and the second comparator, the third input terminal of second comparator
It is connected with one end of the first capacitance by 3rd resistor R5, the 4th input terminal of second comparator is connected with reference voltage,
The output end of second comparator exports open-phase protection level.
In conclusion a kind of open-phase protection circuit provided by the utility model, when three-phase input is normal, DC power supply is given
Energy-storage travelling wave tube charges, and the collected voltage of alternating current sampling circuit is bigger than reference voltage, and the output level of the first comparison circuit is height
One end of level, energy-storage travelling wave tube is high level, and the high level is more than reference voltage, then the output end of the first comparison circuit is height
Level；When three-phase input phase shortage, then energy-storage travelling wave tube electric discharge is controlled so that the height of the first comparison circuit output interlocks level
Low level output is converted to, the low level output avoids the occurrence of staggeredly electricity fluctuated for triggering open-phase protection mechanism
It is flat that electrical equipment is damaged, it realizes open-phase protection, can not be damaged with the electrical equipment of effective protection user.
The above description is only the embodiments of the present invention, and it does not limit the scope of the patent of the present invention, every
Equivalents made based on the specification and figures of the utility model are applied directly or indirectly in relevant technology neck
Domain is equally included in the patent within the scope of the utility model.
Claims (7)
1. a kind of open-phase protection circuit, be arranged between three-phase input end and open-phase protection output end, which is characterized in that including according to
Secondary connected rectification circuit, alternating current sampling circuit, the first comparison circuit, charge-discharge circuit and the second comparison circuit；
First comparison circuit includes the first input end being connected with alternating current sampling circuit and the second input terminal, and the second comparison is electric
Road includes third input terminal and the 4th input terminal；
The open-phase protection circuit further includes the 4th input of the second input terminal and the second comparison circuit for the first comparison circuit
End provides the reference voltage source of reference voltage；
For first comparison circuit for the collected voltage of alternating current sampling circuit to be compared with reference voltage, what is obtained is defeated
Go out level, and output level is passed through to the third input terminal of the second comparison circuit；
The charge-discharge circuit includes DC power supply and energy-storage travelling wave tube, and one end of the energy-storage travelling wave tube is exported with the first comparison circuit
End is connected, and the other end ground connection of the energy-storage travelling wave tube, when three-phase input voltage is normal, DC power supply charges to energy-storage travelling wave tube,
One end of energy-storage travelling wave tube is high level, and when phase shortage occurs in three-phase input voltage, energy-storage travelling wave tube is discharged rapidly by being full of electricity condition,
One end of energy-storage travelling wave tube is low level；
Second comparison circuit exports open-phase protection for the level of one end of energy-storage travelling wave tube to be compared with reference voltage
Level.
2. a kind of open-phase protection circuit according to claim 1, which is characterized in that first comparison circuit includes first
Comparator, the output end of the first comparator are connected with one end of energy-storage travelling wave tube.
3. a kind of open-phase protection circuit according to claim 1, which is characterized in that the charge-discharge circuit includes the first electricity
Resistance, the first capacitance and DC power supply, one end of the first resistor are connected with DC power supply, the other end of the first resistor and
One end of first capacitance is connected, and one end of first capacitance is connected with the output end of first comparator, first electricity
The other end of appearance is grounded.
4. a kind of open-phase protection circuit according to claim 1, which is characterized in that the charging time of the charge-discharge circuit
It is 1-10 seconds.
5. a kind of open-phase protection circuit according to claim 1, which is characterized in that further include protection circuit, the protection
Charge rate of the circuit for increasing charge-discharge circuit when three-phase input end is initially powered is 2-5 times of standard charging rate.
6. a kind of open-phase protection circuit according to claim 1, which is characterized in that the protection circuit includes the second electricity
Resistance, the second capacitance and the first triode, the ground level of first triode respectively with one end of second resistance and the second capacitance
One end be connected, the emitting stage of first triode is connected with the other end of the second resistance, the second resistance it is another
End is connected with DC power supply, and the emitting stage of first triode is connected with the other end of second capacitance, second electricity
The other end of appearance is connected with one end of the first capacitance.
7. a kind of open-phase protection circuit according to claim 1, which is characterized in that second comparison circuit includes third
The third input terminal of resistance and the second comparator, second comparator is connected by 3rd resistor with one end of the first capacitance,
4th input terminal of second comparator is connected with reference voltage, the output end output open-phase protection electricity of second comparator
It is flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721901477.2U CN207732411U (en) | 2017-12-29 | 2017-12-29 | A kind of open-phase protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721901477.2U CN207732411U (en) | 2017-12-29 | 2017-12-29 | A kind of open-phase protection circuit |
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| CN207732411U true CN207732411U (en) | 2018-08-14 |
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| CN201721901477.2U Active CN207732411U (en) | 2017-12-29 | 2017-12-29 | A kind of open-phase protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979065A (en) * | 2017-12-29 | 2018-05-01 | 深圳市汇业达通讯技术有限公司 | A kind of open-phase protection circuit and its control method |
-
2017
- 2017-12-29 CN CN201721901477.2U patent/CN207732411U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979065A (en) * | 2017-12-29 | 2018-05-01 | 深圳市汇业达通讯技术有限公司 | A kind of open-phase protection circuit and its control method |
| CN107979065B (en) * | 2017-12-29 | 2024-05-14 | 深圳市汇业达通讯技术有限公司 | Phase-failure protection circuit and control method thereof |
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