CN107086558B - A kind of electronic circuit of self-identifying zero curve - Google Patents
A kind of electronic circuit of self-identifying zero curve Download PDFInfo
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- CN107086558B CN107086558B CN201710402240.8A CN201710402240A CN107086558B CN 107086558 B CN107086558 B CN 107086558B CN 201710402240 A CN201710402240 A CN 201710402240A CN 107086558 B CN107086558 B CN 107086558B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/004—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect phase sequence; with switching for obtaining correct phase sequence
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- Measurement Of Current Or Voltage (AREA)
Abstract
The present invention relates to a kind of electronic circuits of self-identifying zero curve; the zero curve (J2) in circuit is constituted including firewire (J1), with the firewire (J1) and the voltage sampling end (D) of protection ground wire (J4) is connect through first resistor (R9); it further include voltage comparator circuit, for the voltage of voltage sampling end (D) to be compared with the voltage that electronic circuit is obtained through partial pressure sampling；Selection circuit is connect with the output end of the voltage comparator circuit, branch where the output signal selection zero curve based on voltage comparator circuit.Compared with the existing technology, the present invention can effectively identify zero curve port, for the special electrical equipment for needing to connect zero curve, play the role of identifying zero curve, even if there is firewire and zero curve misconnection, also ensure that circuit output end correctly connects zero curve and firewire, realizes automatic monitoring Live line Zero line function, structure is simple, significant effect.
Description
Technical field
The present invention relates to electronic circuit field more particularly to a kind of electronic circuits of self-identifying zero curve.
Background technique
In industrial circle, the operating voltage of electrical equipment is often very high, in order to prevent because line fault, equipment fault cause
Safety accident, operator can increase earth leakage protective device in circuit, and when leaking electricity, earth leakage protective device will start jump
Lock powers off machine, stops working, to prevent dangerous generation.
But it often there is also in reality, aging circuit or equipment fault cause firewire and zero curve contact fault, once
Wiring error, then will appear that leakage current is exceeded or device housings electrification, the system progress of work be seriously affected, simultaneously because firewire
Zero curve wrong, causes earth leakage protective device can not work normally.
So, it is necessary to a kind of scheme is designed, can ensure that, even if wiring error, machine part will not be because of Live line Zero line
Misconnection and occurring leaks exceeded, machine casing electrification and phenomena such as earth leakage protective device can not work normally, it is ensured that system is normal
Work, prevents accident.
Summary of the invention
Even if providing one kind firewire the technical problem to be solved by the present invention is to status in view of the above technology to go out with zero curve
Existing wiring error, also can self-identifying zero curve, connect route to zero curve always, to avoid causing machine casing to charge because of wrong,
Ensure the electronic circuit of production safety.
The technical scheme of the invention to solve the technical problem is: a kind of electronic circuit of self-identifying zero curve, packet
Firewire (J1) is included, the zero curve (J2) in circuit is constituted with the firewire (J1) and connects protection ground wire (J4) through first resistor (R9)
Voltage sampling end (D), it is characterised in that: further include voltage comparator circuit, for the voltage of voltage sampling end (D) and electronics is electric
The voltage that road is obtained through partial pressure sampling is compared；
Selection circuit is connect with the output end of the voltage comparator circuit, the output signal choosing based on voltage comparator circuit
Branch where selecting zero curve；
Bleeder circuit is divided for the supply voltage to electronic circuit, is sampled, and the voltage that partial pressure sampling is obtained
It is transmitted to the voltage comparator circuit；
Rectification circuit, between bleeder circuit and firewire (J1), rectification comes from the alternating current of firewire (J1), and output is stablized
Supply voltage；
The voltage comparator circuit includes the first operational amplifier (U1), second operational amplifier (U2), and the first operation is put
The non-inverting input terminal of big device (U1) is connected with voltage sampling end (D), and output end connects the second operation by second resistance (R8) and puts
The non-inverting input terminal of big device (U2), the inverting input terminal connection institute of the first operational amplifier (U1), second operational amplifier (U2)
Bleeder circuit is stated, the output end of second operational amplifier (U2) is connect with the selection circuit.
Further, the bleeder circuit include one end be connected with that output end of the rectifying circuit 3rd resistor (R5),
It is grounded with the other end of concatenated 4th resistance (R4) of the other end of 3rd resistor (R5), the 4th resistance (R4), partial pressure samples
To the voltage anti-phase input that is divided to two branches to be separately connected first operational amplifier (U1), second operational amplifier (U2)
End.
Further, the rectification circuit includes first diode (D1), the second diode (D2) and the first voltage-stabiliser tube
(D3), the second voltage-stabiliser tube (D4), the cathode of anode connection firewire (J1) and the first voltage-stabiliser tube (D3) of first diode (D1), the
One diode (D1) cathode connection the second diode (D2) cathode, the second diode (D2) anode connection zero curve (J2) and
The cathode of second voltage-stabiliser tube (D4) is grounded after positive and the second voltage-stabiliser tube (D4) the anode of the first voltage-stabiliser tube (D3) is in parallel.
Further, the selection circuit includes relay coil, the third diode for being parallel to relay coil both ends
(D5), with the commutator of relay coil interoperation, triode Q1, the in described relay coil one end and bleeder circuit
One end of three resistance (R5) is in parallel, the collector of other end connecting triode Q1, and the base stage of triode Q1 passes through the 5th resistance
(R7) it is connect with the output end of the second operational amplifier (U2), emitter ground connection, the first contact (F) of the commutator
It is connect with firewire (J1), the second contact (G) and the anode of the second diode (D2) are correspondingly connected with, and the second contact (G) is normally closed, double-throw
The zero curve layer (J3) of fixing end (E) the connection external device of switch.
Further, the other end of the 4th resistance (R4) is also connected in parallel the 6th resistance (R3), the 6th resistance (R3) it is another
One end is connected first resistor (R9), and first resistor (R9) other end directly connects protection ground wire (J4) or connected by series capacitance and protected
It protects ground wire (J4), voltage sampling end (D) is formed between the 6th resistance (R3) and first resistor (R9).
Further, the electronic circuit further includes protecting positioned at the current foldback circuit of the front end firewire (J1), positioned at overcurrent
Reduction voltage circuit between protection circuit and rectification circuit, the first filter circuit that the output of rectification circuit is filtered, for first, the
Two operational amplifiers the driving circuit of driving power is provided and the voltage of the first operational amplifier (U1) is filtered the
Two filter circuits, to the third filter circuit that the voltage of second operational amplifier (U2) is filtered, the of the commutator
(F) is connected between current foldback circuit and voltage reduction module for one contact.
Further, the current foldback circuit is overcurrent protection protective tube (F1)；The reduction voltage circuit is by parallel with one another
The 7th resistance (R2) and first capacitor (C1) constitute；First filter circuit includes one end and the second diode (D2) cathode
It connects, the 8th resistance (R1) of other end connection one end 3rd resistor (R5) and one end are in parallel with the 8th resistance (R1), the other end
The first polar capacitor (C2) of ground connection；The driving circuit includes that one end is in parallel with one end of 3rd resistor (R5), the other end point
It is respectively the 9th resistance (R6) of the first operational amplifier (U1), second operational amplifier (U2) offer power supply at two branches；Institute
Stating the second filter circuit includes both ends the second capacitor (C5) and the second polar capacitor (C3) parallel with one another, a parallel connected end and the 9th
The other end of resistance (R6) is connected, another parallel connected end ground connection；The third filter circuit is one end and second operational amplifier
(U2) non-inverting input terminal is connected, the third polar capacitor (C4) of other end ground connection.
Compared with the prior art, the advantages of the present invention are as follows: this circuits under normal circumstances, the second contact G of commutator
It is normally closed, when firewire J1 and zero curve J2 wiring are correct, there is the electricity that voltage sampling end D is transmitted to amplifier U1 non-inverting input terminal at this time
The voltage that amplifier inverting input terminal is transmitted to after rectified circuit rectifies, bleeder circuit partial pressure is forced down, thus through two-phase amplifier
Output signal afterwards is low level, and corresponding triode Q1 is not turned on, and relay coil does not work, and commutator keeps the end G closure
It is constant, constant, the proper device operation that connects with zero curve J2 is kept with the zero curve layer of the external device of the circuit connection；When wiring mistake
Accidentally, there is zero curve J2 and connect firewire, when firewire J1 has connect zero curve, voltage sampling end D is transmitted to the electricity of amplifier U1 non-inverting input terminal
Pressure is higher than the voltage that the rectified device of alternating current rectifies, is transmitted to amplifier inverting input terminal after bleeder circuit partial pressure, thus by two
Output signal after phase amplifier is high level, corresponding triode Q3 conducting, relay coil work, is attracted commutator and goes to the
One contact F, what it is at this point, external electrical zero curve layer is connect with firewire J1, and due to firewire J1 connection at this time is zero curve, so
When external connection electrical apparatus be still in safe condition, once avoid previous wiring error, cause to leak exceeded, machine casing electrification,
Phenomena such as earth leakage protective device can not work normally causes accident frequently to occur.
Detailed description of the invention
Fig. 1 is the circuit diagram of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
The electronic circuit of self-identifying zero curve according to an embodiment of the present invention is described below with reference to Fig. 1, which includes firewire
J1, the zero curve J2 and protection ground wire J4 that circuit is constituted with firewire J1.
Overcurrent protection protective tube F1 is connected on firewire J1 route, by the 7th resistance R2 parallel with one another and first capacitor C1
The anode of reduction voltage circuit, the rectification circuit of composition, the rectification circuit is connect by reduction voltage circuit above-mentioned with firewire, cathode connection
Zero curve J2, the rectification circuit include first diode D1, the second diode D2 and the first voltage-stabiliser tube D3, the second voltage-stabiliser tube D4, and
The cathode of anode the connection reduction voltage circuit and the first voltage-stabiliser tube D3 of one diode D1, the cathode connection the two or two of first diode D1
The cathode of pole pipe D2, the cathode of anode the connection zero curve and the second voltage-stabiliser tube D4 of the second diode D2, the first voltage-stabiliser tube D3 is just
It is grounded after the anode of pole and the second voltage-stabiliser tube D4 are in parallel, the cathode of the second diode D2, i.e., the output end of rectification circuit connects the
The other end of other end parallel connection the first polar capacitor C2, the first polar capacitor C2 of eight resistance R1, the 8th resistance R1 are grounded, and the 8th
Resistance R1 and the first polar capacitor C2 constitutes the first filter circuit being filtered to rectification circuit.Enable firewire J1 and the one or two pole
The junction of pipe D1 anode is A point, and the junction of zero curve J2 and the second diode D2 anode is B point, and the first voltage-stabiliser tube D3 is just
Pole place in parallel with the anode of the second voltage-stabiliser tube D4 is C point.
Overcurrent protection protective tube for preventing overtension, burn by circuit overcurrent；Reduction voltage circuit is by being depressured alternating current
It is divided into and is suitable for the voltage that subsequent conditioning circuit uses, guarantee the safety of circuit system；And rectification circuit and the first filter circuit knot
Close, the alternating voltage of positive and negative variation is become into unidirectional pulsating volage using the unilateral conduction of diode, by AC conversion at
The direct current of loaded work piece eliminates as much as the alternating component in direct current using filter circuit, makes the supply voltage of output more
Stablize, guarantees the stability of circuit.Meanwhile double voltage stabilizing tube is used in rectification circuit, it can effectively keep the input on bleeder circuit
Voltage holding stablize it is constant, so that benchmark fiducial value is provided relatively for subsequent voltage, conducive to the realization of System Working Principle.
Further, the other end of the 8th resistance R1 bleeder circuit, selection circuit, driving circuit also in parallel.Wherein, it divides
Circuit include the 3rd resistor R5 being connect with the 8th resistance R1 other end, with the concatenated 4th resistance R4 of 3rd resistor R5, the 4th
The other end of resistance R4 is grounded, and carries out partial pressure sampling to the supply voltage of electronic circuit, and be transported to voltage comparator circuit；
Ground wire J4 includes concatenated 6th resistance R3 and first resistor R9, and the 4th resistance R4's of other end parallel connection of the 6th resistance R3 is another
End, another termination protecting field line J4 of first resistor R9 form voltage sampling end D between the 6th resistance R3 and first resistor R9.Certainly,
First resistor R9 can also by connect after series capacitance with protection ground wire J4, for example, by connect one or more Y capacitances and
Protect ground wire J4 connection.
Selection circuit includes relay coil, the third diode D5 for being parallel to relay coil both ends and relay line
The single-pole double-throw switch (SPDT) and triode Q1 of interoperation are enclosed, relay coil one end is connect with the other end of the 8th resistance R1, separately
The base stage of the collector of one end connecting triode Q1, triode Q1 is connected by the output end of the 5th resistance R7 and voltage comparator circuit
It connecing, emitter ground connection, the first contact F of single-pole double-throw switch (SPDT) is connected between overcurrent protection protective tube F1 and reduction voltage circuit, the
Two contact G are connect with the anode of the second diode D2, and the end G is normally closed, the zero curve layer of the fixing end E connection external device of commutator
J3；Certainly, in the present embodiment, single-pole double-throw switch (SPDT) can also change other conversion selecting switch, such as double-point double-throw switch into
Deng, those skilled in the art can corresponding selection according to actual needs, details are not described herein.
Voltage comparator circuit includes two the first operational amplifier U1, second operational amplifier U2, the first operational amplifier
The non-inverting input terminal of U1 is connected with voltage sampling end D, and output end is same by second resistance R8 connection second operational amplifier U2's
Phase input terminal, the first operational amplifier U1, second operational amplifier U2 inverting input terminal connect aforementioned bleeder circuit partial pressure after
Supply voltage, triode Q1 base stage connection is second operational amplifier U2 output end.
Driving circuit includes one end nineth resistance R6 in parallel with one end of relay coil, the pressure drop on the 9th resistance R6
It is divided into the driving end that two branches connect the first operational amplifier U1, second operational amplifier U2 through its other end end, to provide
Driving power.
Further, the circuit further include the second filter circuit for being filtered to the first operational amplifier U1, it is right
The third filter circuit that second operational amplifier U2 is filtered, the selection of filter circuit can there are many.Specifically, in this reality
It applies in example, the second filter circuit includes both ends the second capacitor C5 parallel with one another and the second polar capacitor C3, a parallel connected end and the
The other end of nine resistance R6 is connected, another parallel connected end ground connection；The third filter circuit is one end and second operational amplifier U2
Non-inverting input terminal is connected, the third polar capacitor C4 of other end ground connection.By guaranteeing amplifier for each operational amplifier design filter circuit
It works more steady.
Specific works are as follows:
Taking resistance value 200K Ω, the 8th resistance R1, the 9th each value of resistance R6 of the 7th resistance R2 is 100R, the 4th resistance
Each value 10K Ω of R4,3rd resistor R5, the 6th resistance R3, each value 10M Ω of first resistor R9, the 5th resistance R7, second resistance
Each value 1K Ω of R8；
When firewire J1 normally starts to exchange fire line, when zero curve J2 normally connects zero curve, enabling protection ground wire J4 ground terminal is H point, then B point and
H point equipotential is equivalent to B point voltage equal to voltage sampling end D voltage, can not consider, voltage sampling end D then mainly passes through
If under type obtains, i.e. firewire J1 is to A point after resistance-capacitance depressurization, and voltage (about 12V) is through the first voltage-stabiliser tube D3 after the decompression of A point
To C point, the A point voltage that C point voltage is about 1/4, as 3V, voltage sampling end D are divided through the 6th resistance R3 and first resistor R9
It is afterwards 1/2 C point voltage, the inverting input terminal voltage of about 1.5V, the first operational amplifier U1 are through the 4th resistance R4, third electricity
It hinders and obtains about 6V after R5 is divided, the inverting input terminal voltage due to voltage sampling end D less than the first operational amplifier U1, first
Operational amplifier U1 output end exports low level, while the output end of second operational amplifier U2 is also low level, triode Q1
Cut-off, relay coil do not work, and the normally closed end G of commutator is still closed, i.e. the E point of commutator connects J2 zero curve through G point
Output, it is ensured that the safety of rear end external connection electrical apparatus；
Work as wiring error, firewire J1 occur and connect zero curve, zero curve J2 start to exchange fire line when, A point and H point are equipotential, are equivalent to A point
Voltage is equal to voltage sampling end D, can not consider, voltage sampling end D is mainly obtained by following manner, J2's (about 220V)
B point is through the second voltage-stabiliser tube D4 to C point, the B point voltage that C point voltage is about 1/4, and about 55V, voltage sampling end D are divided through R3, R9
For 1/2 C point voltage, about 27.5V, the inverting input terminal of the first operational amplifier U1 is through the 4th resistance R4,3rd resistor R5
Obtaining after partial pressure is about 6V voltage, since voltage sampling end D is greater than the first operational amplifier U1 inverting input terminal voltage, is then exported
High level, second operational amplifier U2 also export high level, triode Q1 conducting simultaneously, and relay coil work is attracted double-throw
Switch turns to the end F closure, i.e. E point is connect through F point with J1, and J1 is due to wiring error at this time, the zero curve connect, then ensure that rear end
External connection electrical apparatus still connects zero curve circuit, ensures that safety, that is to say, that even if because circuit question or other originals
Because leading to system wiring mistake, this circuit also can automatic identification zero curve, and guarantee that rear end external device contacts zero curve always, avoid
Phenomena such as previous device terminal mistake, causes leakage current exceeded, and outer casing electrification and earth leakage protective device can not work normally.
It need to point out, the modules in this circuit can also be other deformations mentioned in addition to the present embodiment,
Those skilled in the art can carry out equivalence replacement according to actual needs.Meanwhile the capacity of the resistance value of each resistance, capacitor can root
It is selected according to actual needs, as long as the circuit after value is able to achieve the comparison of the application, to realize automatic identification zero curve, herein
It repeats no more.
Although an embodiment of the present invention has been shown and described, it will be appreciated by those skilled in the art that: do not departing from this
These embodiments can be carried out with a variety of variations, modification, replacement and deformation in the case where the principle and objective of invention, it is of the invention
Range is defined by the claims and their equivalents.
Claims (7)
1. a kind of electronic circuit of self-identifying zero curve constitutes the zero curve (J2) in circuit including firewire (J1), with the firewire (J1)
And the voltage sampling end (D) of protection ground wire (J4) is connect through first resistor (R9), it is characterised in that: further include that voltage is more electric
Road, for the voltage of voltage sampling end (D) to be compared with the voltage that electronic circuit is obtained through partial pressure sampling；
Selection circuit is connect with the output end of the voltage comparator circuit, the output signal selection zero based on voltage comparator circuit
Branch where line；
Bleeder circuit is divided for the supply voltage to electronic circuit, is sampled, and the voltage transmission that partial pressure sampling is obtained
To the voltage comparator circuit；
Rectification circuit, between bleeder circuit and firewire (J1), rectification comes from the alternating current of firewire (J1), exports stable electricity
Source voltage；
The voltage comparator circuit includes the first operational amplifier (U1), second operational amplifier (U2), the first operational amplifier
(U1) non-inverting input terminal is connected with voltage sampling end (D), and output end connects second operational amplifier by second resistance (R8)
(U2) non-inverting input terminal, described point of inverting input terminal connection of the first operational amplifier (U1), second operational amplifier (U2)
The output end of volt circuit, second operational amplifier (U2) is connect with the selection circuit.
2. electronic circuit according to claim 1, it is characterised in that: the bleeder circuit includes one end and the rectified current
The 3rd resistor (R5) of road output end connection, concatenated 4th resistance (R4) of the other end with 3rd resistor (R5), the 4th resistance
(R4) other end ground connection, the obtained voltage of partial pressure sampling be divided to two branches be separately connected first operational amplifier (U1),
The inverting input terminal of second operational amplifier (U2).
3. electronic circuit according to claim 2, it is characterised in that: the rectification circuit include first diode (D1),
Second diode (D2) and the first voltage-stabiliser tube (D3), the second voltage-stabiliser tube (D4), the anode connection firewire of first diode (D1)
(J1) and the cathode of the first voltage-stabiliser tube (D3), the cathode of the cathode connection the second diode (D2) of first diode (D1), second
The cathode of anode connection zero curve (J2) and the second voltage-stabiliser tube (D4) of diode (D2), the anode and second of the first voltage-stabiliser tube (D3)
It is grounded after the anode of voltage-stabiliser tube (D4) is in parallel.
4. electronic circuit according to claim 3, it is characterised in that: the selection circuit includes relay coil, parallel connection
In relay coil both ends third diode (D5), with the commutator of relay coil interoperation, triode Q1, it is described
Relay coil one end is in parallel with the one end of 3rd resistor in bleeder circuit (R5), the collector of other end connecting triode 01,
The base stage of triode Q1 is connect by the 5th resistance (R7) with the output end of the second operational amplifier (U2), and emitter connects
First contact (F) on ground, the commutator is connect with firewire (J1), the anode of the second contact (G) and the second diode (D2)
It is correspondingly connected with, the second contact (G) is normally closed, the zero curve layer (J3) of fixing end (E) the connection external device of commutator.
5. electronic circuit according to claim 2, it is characterised in that: the other end of the 4th resistance (R4) is also connected in parallel
The other end of six resistance (R3), the 6th resistance (R3) is connected first resistor (R9), and first resistor (R9) other end directly connects protection
Ground wire (J4) connects protection ground wire (J4) by series capacitance, and voltage sampling end (D) is formed in the 6th resistance (R3) and first
Between resistance (R9).
6. electronic circuit according to claim 4, it is characterised in that: the electronic circuit further includes before being located at firewire (J1)
The current foldback circuit at end, the reduction voltage circuit between current foldback circuit and rectification circuit carry out the output of rectification circuit
First filter circuit of filtering provides the driving circuit of driving power for the first, second operational amplifier and to the first operation
The second filter circuit that the voltage of amplifier (U1) is filtered, that the voltage of second operational amplifier (U2) is filtered
The first contact (F) of three filter circuits, the commutator is connected between current foldback circuit and voltage reduction module.
7. electronic circuit according to claim 3, it is characterised in that: the current foldback circuit is overcurrent protection protective tube
(F1)；The reduction voltage circuit is made of the 7th resistance (R2) parallel with one another and first capacitor (C1)；First filter circuit
It is connect including one end with the second diode (D2) cathode, the 8th resistance (R1) of other end connection one end 3rd resistor (R5), and
The first polar capacitor (C2) that one end is in parallel with the 8th resistance (R1), the other end is grounded；The driving circuit includes one end and the
One end of three resistance (R5) is in parallel, and it is respectively the first operational amplifier (U1), second operational amplifier that the other end, which is divided into two branches,
(U2) the 9th resistance (R6) of power supply is provided；Second filter circuit includes both ends the second capacitor (C5) parallel with one another and
Two polar capacitors (C3), a parallel connected end are connected with the other end of the 9th resistance (R6), another parallel connected end ground connection；The third filtering
Circuit is that one end is connected with the non-inverting input terminal of second operational amplifier (U2), the third polar capacitor (C4) of other end ground connection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710402240.8A CN107086558B (en) | 2017-05-31 | 2017-05-31 | A kind of electronic circuit of self-identifying zero curve |
| EP18158840.1A EP3402028B1 (en) | 2017-05-11 | 2018-02-27 | Electronic circuit for self-identifying zero wire and heat generating plate having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710402240.8A CN107086558B (en) | 2017-05-31 | 2017-05-31 | A kind of electronic circuit of self-identifying zero curve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107086558A CN107086558A (en) | 2017-08-22 |
| CN107086558B true CN107086558B (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710402240.8A Active CN107086558B (en) | 2017-05-11 | 2017-05-31 | A kind of electronic circuit of self-identifying zero curve |
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| CN (1) | CN107086558B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117613837B (en) * | 2023-12-05 | 2024-10-18 | 唐山标先电子有限公司 | Phase-dislocation protection circuit and method for three-phase four-wire system electric equipment and application of phase-dislocation protection circuit and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202616772U (en) * | 2012-04-19 | 2012-12-19 | 美的集团有限公司 | Automatic identification and conversion circuit for alternating current zero and live wires |
| CN103633681B (en) * | 2012-08-26 | 2018-01-09 | 郭振华 | A kind of charger identifies change-over circuit with Live line Zero line |
| CN103138260A (en) * | 2013-01-09 | 2013-06-05 | 余姚市锦众电子有限公司 | Phase wire recognition device |
| CN104009448B (en) * | 2013-02-23 | 2018-04-24 | 吴伟 | A kind of the new pattern creepage means of defence and device of band fire zero curve identification function |
| CN106787048B (en) * | 2017-01-04 | 2023-10-27 | 上海广为美线电源电器有限公司 | Charger with function of automatically identifying input voltage |
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2017
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Also Published As
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| CN107086558A (en) | 2017-08-22 |
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