CN106680550B

CN106680550B - With the accurate three-phase and four-line electric energy meter for crossing zero phase line switching

Info

Publication number: CN106680550B
Application number: CN201710029829.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2017-01-12
Filing date: 2017-01-12
Publication date: 2019-07-30
Anticipated expiration: 2037-01-12
Also published as: CN106680550A

Abstract

The invention discloses with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching.It is related to electric energy meter technical field, which can in time be switched to a part load being connected in the three-phase and four-line electric energy meter high power phase line in the three-phase and four-line electric energy meter low-power phase line when the unbalanced power for occurring being connected in each phase of three-phase and four-line electric energy meter.Including three-phase and four-line electric energy meter ontology, three-phase and four-line electric energy meter ontology includes A phase, B phase, C phase, zero curve N and three-phase electric energy metering module, further includes node J1 and controller and difference three-phase equilibrium monitor, Single-Phase Inverter Source, No. two voltage sampling circuits and interface power monitor connected to the controller；The power output end of Single-Phase Inverter Source is connected with the power input of isolating transformer, and node J1 is connect with the sampling end of the power output end of isolating transformer and No. two voltage sampling circuits respectively, and three-phase electric energy metering module is connect with controller.

Description

With the accurate three-phase and four-line electric energy meter for crossing zero phase line switching

Technical field

The present invention relates to electric energy meter technical fields, and in particular to the accurate three-phase and four-line electric energy for crossing zero phase line switching Table.

Background technique

With the development of economy and society, the type of electrical equipment is more and more.Since current power supply system is typically all Three-phase power supply system if the power on three-phase occurs biggish asymmetric, just will appear power grid in three-phase power supply system Off-center operation, just will appear power grid shake.

When operation of power networks is in non-equilibrium state, the transformer in power grid is at asymmetric operation state, in not right Claiming the transformer of operating status can make the zero-sequence current of transformer excessive, and excessive zero-sequence current can make the local part of transformer Temperature increases, if the local Part temperature of transformer increase it is excessive may can burn transformer, to cause power supply system Power outage.

When unbalanced power supply operation, if to allow the power grid of off-center operation to become the power grid of balance movement, at present The method taken is will be big to another positioned at a part load manual switching in the high power phase line of an a wide range of section In the low-power phase line of range section.Since the load that this switching mode switches in moment is more, lead to rushing for moment switching Hit that electric current is excessive, excessive dash current can not only burn out switching equipment, due also to load switching at that moment, the load The power supply phase line difference of switching front and back will lead to the loaded work piece and occur chaotic or even damage.

It due to specifically loading is used by some particular user, all electricity consumptions of each particular user will use three-phase Four line electric energy meters carry out electrical energy measurement, therefore, if all loads that can be connected using three-phase and four-line electric energy meter switch as phase line Basic phase line switch unit, as long as then the power in the basic phase line switch unit of each of entire power grid is in a basic balance Then it is ensured that the power of entire power grid be also it is in a basic balance, will power grid be in balance movement state.

The basic phase line switch unit that all loads connected using three-phase and four-line electric energy meter switch as phase line, this not only increases The flexibility for having added power grid phase line to switch, since the load connected on a three-phase and four-line electric energy meter is relative to an a wide range of piece Much less for area, this phase line switch generated dash current and also want considerably less.It therefore, if can be by three-phase and four-line electricity A part load being connected in the three-phase and four-line electric energy meter high power phase line is switched to the three-phase and four-line electric energy in time by energy table In table low-power phase line, which not only adds the flexibilities of entire network load switching, also increase the reliable of phase line switching Property, substantially increase the stability of operation of power networks.Therefore, design it is a kind of can be according to being connected in each phase line of three-phase and four-line electric energy meter The unbalanced power of load is realized automatically is switched to a part load in high power phase line in low-power phase line, makes three as far as possible The three-phase and four-line electric energy meter of power-balance in four each phase line of line electric energy meter of phase is very necessary.

Summary of the invention

The present invention is to cause to occur being connected to three-phase to solve existing three-phase and four-line electric energy meter and do not have phase line handoff functionality One for cannot being connected in the three-phase and four-line electric energy meter high power phase line when unbalanced power in four each phases of line electric energy meter Point deficiency that is switched in the three-phase and four-line electric energy meter low-power phase line of load provides a kind of when occurring being connected to three-phase and four-line electricity The a part being connected in the three-phase and four-line electric energy meter high power phase line can be born in time when unbalanced power in each phase of table Load is switched in the three-phase and four-line electric energy meter low-power phase line, and switching electric current is small, and when switching will not burn out combination switch, easily to from The battery pack progress charge and discharge control of electricity consumption power supply module has the accurate three-phase and four-line electric energy meter for crossing zero phase line switching.

To achieve the goals above, the invention adopts the following technical scheme:

With the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, including three-phase and four-line electric energy meter ontology, three-phase and four-line Electric energy meter ontology includes A phase, B phase, C phase, zero curve N and three-phase electric energy metering module, further include node J1 and controller and point Three-phase equilibrium monitor not connected to the controller, No.1 voltage sampling circuit, Single-Phase Inverter Source, isolating transformer, No. two Voltage sampling circuit and interface power monitor.The power output end of Single-Phase Inverter Source and the power input of isolating transformer Connection, node J1 are connect with the sampling end of the power output end of isolating transformer and No. two voltage sampling circuits respectively, three-phase electricity Energy metering module is connect with controller.

It further include control terminal switch Ki connected to the controller, wherein i is positive integer, 1≤i≤42.

It further include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the firewire of node J14 End is connected with B, and the zero line of node J6 is connected with C.The zero line side of node J18, the zero line side of node J14 and node J6 Zero line side is all connect with zero curve N respectively.

The electrical energy measurement end of three-phase electric energy metering module, the monitoring side of three-phase equilibrium monitor and No.1 voltage sampling circuit Sampling end all connect respectively with node J18, node J14 and node J6.

The power input of Single-Phase Inverter Source is connect by switch K40 with node J18, and the power supply of Single-Phase Inverter Source is defeated Enter end to connect by switch K41 with node J14, the power input of Single-Phase Inverter Source is connect by switch K42 with node J6.

It further include the No.1 loading interfaces being connect respectively with the monitoring side of interface power monitor, No. two loading interfaces, three Number loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces.

It further include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node J11, node J12, node J13, node J15, node J16, node J17 and node J19.

Node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and No. six loading interfaces are sequentially connected in series, node J6, switch K21, node J7, switch K22, node J8, switch K23, node J9, Switch K24, node J10 and No. five loading interfaces are sequentially connected in series, node J14, switch K29, node J11, switch K30, section Point J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, node J14, switch K34, node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, node J18, switch K38, node J17 and No. two loading interfaces according to Secondary series connection, node J18, switch K39, node J19 and No.1 loading interfaces are sequentially connected in series.

Node J1, switch K1, node J2, switch K17 and node J19 are sequentially connected in series, node J1, switch K2, node J7, switch K25 and node J19 are sequentially connected in series, and node J1, switch K3, node J11, switch K32 and node J19 successively go here and there Connection connection, node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, node J1, switch K5, node J3, switch K18 and node J17 are sequentially connected in series, and node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series Connection, node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series, node J1, switch K8, node J16, switch K37 and node J17 are sequentially connected in series, and node J1, switch K9, node J4, switch K19 and node J16 successively go here and there Connection connection, node J1, switch K10, node J9, switch K27 and node J16 are sequentially connected in series, node J1, switch K11, node J5, switch K20 and node J13 are sequentially connected in series, and node J1, switch K12, node J10, switch K28 and node J13 successively go here and there Connection connection.

The switch K40, switch K41 and switch K42 are the identical combination switch of circuit structure；Combination switch packet Include No.1 node, No. two nodes, switching switch K_a, node M_a, inductance L_a, node M_b, capacitor Ca, diode D₁, diode D₂, two Pole pipe D₃, diode D₄, capacitor C₀, photoelectrical coupler OPT, resistance R₀, from electricity consumption power supply module, Magnetic driving circuit and silicon drive Circuit switches switch K_aIncluding reverse-blocking tetrode thyristor K_bWith magnetic latching relay switch K_c, photoelectrical coupler OPT includes light-emitting diodes Pipe D₅With phototriode Q₀；Reverse-blocking tetrode thyristor K_bOne end and magnetic latching relay switch K_cOne end be connected to No.1 On node, No.1 node can only be connected in the wherein phase in A phase, B phase and C phase this three-phase in discontinuity surface when same；It can Control transwitch K_bThe other end, magnetic latching relay switch K_cThe other end, inductance L_aOne end, diode D₁Positive terminal and Diode D₃Negative pole end be all connected to node M_aOn, inductance L_aThe other end, capacitor Ca one end and capacitor C₀One end all connect It connects in node M_bOn, the other end of capacitor Ca is connected on No. two nodes, and No. two nodes are connected on zero curve N, diode D₂Just Extreme and diode D₄Negative pole end be all connected to capacitor C₀The other end on, diode D₁Negative pole end and diode D₂It is negative Extremely all it is connected to light emitting diode D₅Positive terminal on, diode D₃Positive terminal and diode D₄Positive terminal be all connected to Light emitting diode D₅Negative pole end on, phototriode Q₀Emitter ground connection, phototriode Q₀Collector respectively with resistance R₀One end connected with controller, resistance R₀The other end connect with from electricity consumption power supply module, silicon driving circuit respectively with it is silicon-controlled Switch K_bControl terminal connected with controller, Magnetic driving circuit respectively with magnetic latching relay switch K_cControl terminal and controller Connection.

Include battery connection module, company can be sequentially connected in series by several mutually independent single batteries from electricity consumption power supply module Battery pack made of connecing；From electricity consumption power supply module further include charger equal with single battery number respectively, switching switch and Current limliting module；Battery connection module includes the bulk charging bindiny mechanism equal with single battery number；It is connected in each bulk charging Bulk voltage detection chip is respectively equipped in mechanism；The power output end of each charger is one-to-one to be connected to each switching switch choosing It selects on a terminals at end；On one-to-one one end for being connected to current limliting module of turning end of each switching switch, each current limliting In the one-to-one bulk charging bindiny mechanism for being connected to battery connection module of the other end of module；Battery connection module is connected to battery In group, the control terminal of the battery connection module, each bulk voltage detection chip, the control terminal of each current limliting module and each cut The control terminal for changing switch is connect with controller respectively；And under the control of the controller, when not being battery pack charging, battery connection Mutually independent single battery each in battery pack can be sequentially connected in series by module becomes series-connected cell together, when for battery When group charging, the series-connected cell for being sequentially connected in series together in battery pack can be become mutually independent list by battery connection module Body battery；

The power input of each charger and the power input of controller are conductively connected the successively control that is powered at one In mechanism processed, and the successive control mechanism that is powered when powering on first is powered to controller, then gives charger to be powered again；In lower electricity The successive control mechanism of Shi Tong electricity first allows charger to power off, and then allows controller to power off again.

The successive control mechanism of the energization of this programme is first powered by controller, and controller just allows battery connection module will after being powered The series-connected cell being sequentially connected in series in battery pack together becomes mutually independent single battery, is then electrified to successive control machine Structure just allows charger to be powered, and can be fully ensured that in this way when charger is powered, is independent from each other between each single battery, Charging would not be impacted between each single battery, thus easily automatically controlled to charge and discharge is carried out from the battery pack of electricity consumption power supply module System.

This programme is when in use, it is assumed that under normal circumstances, No.1 loading interfaces with No. two loading interfaces are supplied by A phase Electricity, No. three loading interfaces with No. four loading interfaces are powered by B phase, and No. five loading interfaces and No. six loading interfaces are all by C Mutually power.

The three-phase equilibrium monitor of this programme is in setting time interval to the A phase of three-phase and four-line electric energy meter, B phase and C phase Power-balance monitoring is carried out, and the data of monitoring are uploaded to controller, what controller immediately uploaded three-phase equilibrium monitor Data carry out calculation processing.If occurring any two-phase function after the data calculation processing that controller uploads three-phase equilibrium monitor When the difference of rate is greater than the set value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phase.

Then controller just gives one work order of interface power monitor immediately, and interface power monitor is immediately to No.1 Loading interfaces, No. two loading interfaces, No. three loading interfaces, No. four loading interfaces, No. five loading interfaces and No. six loading interfaces into Row power monitoring, and monitoring result is uploaded into controller, controller is stood after receiving the data transmitted in one to No. five loading interfaces Carry out calculation processing.If obtaining being added to the load in No.1 loading interfaces in No. six loading interfaces or being added to after calculating It is that each phase power of power grid can most be allowed to keep balance in No. six loading interfaces, then under the control of the controller just loading No.1 The power supply of interface is switched to C phase from A phase.

The handoff procedure that the power supply of No.1 loading interfaces is switched to C phase from A phase is as follows:

First, it is assumed that before the handover, switch K1 to switch K20, switch K25, switch K26, switch K27, switch K28, opening K32, switch K33, switch K36, switch K37, switch K40, switch K41 and switch K42 are closed all in off-state, switch K21, Switch K22, switch K23, switch K24, switch K29, switch K30, switch K31, switch K34, switch K35, switch K38 and switch K39 is all in closed state.

Then, A is connected by the switch of No.1 voltage sampling circuit, and No.1 voltage sampling circuit acquires the voltage letter of A phase Number and be uploaded to controller.

Then, switch K42 closure connects C phase and Single-Phase Inverter Source, and the voltage signal of Single-Phase Inverter Source output is with A phase Voltage signal as reference, using Single-Phase Inverter Source export voltage signal be used as feedback signal, composition closed-loop control, controlling In device processed generate SPWM driving signal, make Single-Phase Inverter Source export voltage waveform through isolating transformer export it is stable just String wave power supply.When isolating transformer output sine-wave power and A phase voltage with amplitude same-phase when, be closed at switch K1 with Switch K17, and simultaneously switch off switch K39, at this time the power supply state in No.1 loading interfaces or and A phase on power supply shape State is identical.

Then, controller use phase shifting control, make Single-Phase Inverter Source export voltage waveform after filter filtering again Stable sine-wave power is exported through isolating transformer.When the sine-wave power and the same amplitude of C phase voltage of isolating transformer output When same-phase, switch K1 is disconnected, and be closed at switch K13, the power supply state in No.1 loading interfaces is with regard to complete at this time Identical with the power supply status in C phase, i.e., the power supply of No.1 loading interfaces has been switched to C phase from A phase at this time.

Finally switch K42 is disconnected, Single-Phase Inverter Source is bypassed and exits, so far a Phase-switching operation terminates. Other loading interfaces switching principles are identical.

In the combination switch of this programme, inductance L_aUsing high-frequency inductor, inductance L_aInductance be tens microhenrys.When controllable Transwitch K_bOr magnetic latching relay switch K_cMoment is connected, the impedance of capacitor Ca is about 0, and due to inductance L_aPresence, inductance L_aIn conducting moment, frequency changes very greatly, inductance L_aImpedance it is also very big, it is suppressed that the dash current of power supply conducting moment；When When circuit works normally, since supply frequency is 50Hz power frequency, then inductance L_aImpedance very little.

In inductance L_aIn, inductance L_aVoltage U_LaAdvanced inductance L_aElectric current I₁90 degree, i.e. inductance L_aElectric current I₁Fall behind electricity Feel L_aVoltage U_La90 degree.

In capacitor C₀In, capacitor C₀Electric current I₂Advanced capacitor C₀Voltage U_C090 degree, i.e. capacitor C₀Voltage U_C0Fall behind electricity Hold C₀Electric current I₂90 degree.

Electric current I₁Pass through inductance L_a, capacitor Ca formed closed circuit, then have inductance L_aOn voltage U_LaAdvanced inductance L_aOn Electric current I₁90 degree.

As inductance L_aVoltage U_LaIn node M sometime_aPoint be positive, node M_bPoint is when being negative, then electric current I₂From node M_aPoint passes through diode D₁, light emitting diode D₅, diode D₄With capacitor C₀Form branch.

Ignore diode D₁, light emitting diode D₅With diode D₄Pressure drop, it is clear that have i.e. U_La=U_C0, i.e. inductance L_aElectricity Press U_LaEqual to capacitor C₀Voltage U_C0.Obviously there is inductance L_aOn voltage U_LaLag capacitor C₀On electric current I₂90 degree, to have Capacitor C₀On electric current I₂With inductance L_aOn electric current I₁It is reversed each other, i.e. electric current I₂With electric current I₁It is reversed each other.U_CNIt is in C phase Voltage.

As electric current I₂It is positive and be greater than light emitting diode D₅When luminous minimum current, the output signal U of photoelectrical coupler_I0 Become low level from high level, reasonably selects capacitor C₀, make capacitor C₀On electric current I₂Positive zero crossing and hair can be rapidly achieved Optical diode D₅Luminous minimum current.

As electric current I₂After positive zero crossing, the output signal U of photoelectrical coupler_I0Become low level from high level, due to Electric current I₂With electric current I₁Reversely, then there is the output signal U when photoelectrical coupler_I0When becoming high level from low level, electric current I₁Just In positive zero crossing.Therefore the output signal U of photoelectrical coupler_I0When becoming high level from low level, that is, obtain electric current I₁ Zero crossing electric current.When obtaining electric current I₁Zero crossing electric current when, controller can give magnetic latching relay switch K immediately_cHair Signal is opened or closed out.Allow magnetic latching relay switch K if necessary_cIt disconnects, then controller is just opened to magnetic latching relay Close K_cIt issues and disconnects control signal, magnetic latching relay switch K_cIt then turns off；Allow magnetic latching relay switch K if necessary_cIt closes It closes, then controller just gives magnetic latching relay switch K_cIssue closure control signal, magnetic latching relay switch K_cIt is closed immediately. This programme switchs magnetic latching relay further according to the correct time point from by obtaining correct time point when current zero-crossing point K_cThe control signal that is opened or closed is issued to make magnetic latching relay switch K_cContact be opened or closed, then flow through magnetic guarantor Hold relay switch K_cElectric current it is small, magnetic latching relay switch K is opened or closed in low current_c, so that magnetic latching relay Switch K_cContact be hardly damaged.To effectively extend magnetic latching relay switch K_cService life, and then extend compound open The service life of pass.

When putting into combination switch, because of reverse-blocking tetrode thyristor K_bThe moment of conducting, due to inductance L_aElectric current inhibiting effect, Big dash current will not occur, and due to reverse-blocking tetrode thyristor K_bConduction voltage drop very little, and inductance L_aThe impedance under work frequency Very little, node M_aAnd node M_bThe pressure drop of point-to-point transmission is smaller, is closed magnetic latching relay switch K at this time_c, to magnetic latching relay Switch K_cContact damage very little, thus effectively extend control transwitch K_bService life, and then extend the use of combination switch Service life.

This programme is in reverse-blocking tetrode thyristor K_bIt is on and magnetic latching relay switch K_cWhen in closure, if to turn off Reverse-blocking tetrode thyristor K_b, then in electric current I₁Zero crossing Shi Cairang reverse-blocking tetrode thyristor K_bIt disconnects, it in this way being capable of effective protection reverse-blocking tetrode thyristor K_bService life.

This programme is only in the reverse-blocking tetrode thyristor K that put into combination switch to C phase_bWhen throw when just using voltage over zero Enter, as long as all being put into or being cut off using current over-zero in the case where having electric current on combination switch, substantially increases compound The service life of switch, reliability is higher, and safety is preferable.

In the present solution, working as reverse-blocking tetrode thyristor K_bWhen conducting, in magnetic latching relay switch K_cThere are no in the case where disconnection, Magnetic latching relay switch K at this time_cIt is also conducting, i.e. reverse-blocking tetrode thyristor K_bWith magnetic latching relay switch K_cSimultaneously at this time It is in the conductive state.Due to reverse-blocking tetrode thyristor K_bBranch has inductance L_aConducting resistance, it is clear that magnetic latching relay switch K_cBranch The impedance on road will be far smaller than reverse-blocking tetrode thyristor K_bThe impedance of branch, therefore flow through magnetic latching relay switch K_cElectric current be greater than Flow through reverse-blocking tetrode thyristor K_bThe electric current of branch.If magnetic latching relay switch K_cNot in current zero-crossing point break contact, easily damage Contact.This programme is from by obtaining inductance L_aThe electric current I of branch₁Correct time point when zero crossing, then controller is allowed to issue control Signal disconnects magnetic latching relay switch K_cContact, allow magnetic latching relay switch K_cCarried out when electric current is smaller closure or Disconnection movement, thus not easy burn-out magnetic latching relay switch K_cOn contact, effectively extend magnetic latching relay and open Close K_cService life, and then also extend the service life of combination switch, structure is simple, high reliablity.

The three-phase and four-line electric energy meter of this programme is when the unbalanced power for occurring being connected in each phase of three-phase and four-line electric energy meter A part load being connected in the three-phase and four-line electric energy meter high power phase line can be switched to the three-phase and four-line electric energy meter in time In low-power phase line, and the power supply phase line of each loading interfaces can arbitrarily switch, and switching electric current is small, and when switching will not burn out multiple Combination switch.The three-phase and four-line electric energy meter not only increases the flexibility of entire network load switching, also increases phase line switching Reliability can greatly improve the stability and reliability of operation of power networks, and structure is simple, and intelligence degree is high, good reliability.We Case by acquisition current zero-crossing point, then issues control signal, the touching of combination switch is opened or closed in switching combination switch Point, the small contact for being hardly damaged combination switch of switching electric current, effectively extends the service life of combination switch.

Preferably, further including memory connected to the controller.Memory is convenient for the letter of storage three-phase and four-line electric energy meter Breath, it is simple and easy to use.

Preferably, further including filter, filter is connected in series in power output end and the isolation of Single-Phase Inverter Source On line between the power input of transformer.Filter improves the reliability of isolating transformer input, so that every Reliability from transformer output is higher.

Preferably, the no-load voltage ratio of isolating transformer is greater than 1.17.Due to the width of the sinusoidal voltage of Single-Phase Inverter Source output Maximum 0.85 times for there was only input voltage of value, therefore isolating transformer is connected in the back of filter, no-load voltage ratio is greater than 1.17, so that The output voltage amplitude of switching three-phase and four-line electric energy meter reaches 220V, improves the practicability of three-phase and four-line electric energy meter and reliable Property.

Preferably, further including the accurate operating passing zero control method of combination switch, the accurate zero passage of the combination switch Switching control method is as follows:

(1-1) puts into combination switch；

(1-1-1) first detects voltage U on firewire C when to put into combination switch to firewire C_CNWhen accurate when zero crossing Between point, as voltage U_CNWhen zero crossing, controller is immediately to reverse-blocking tetrode thyristor K_bIssue conductivity control signal, reverse-blocking tetrode thyristor K_bWith Be connected；

(1-1-2) is as reverse-blocking tetrode thyristor K_bAfter setting time is connected, electric current I is first detected₁Correct time point when zero crossing, As electric current I₁When zero crossing, controller is immediately to magnetic latching relay switch K_cClosure control signal is issued, magnetic latching relay is opened Close K_cIt is closed immediately；

(1-1-3) then detects electric current I again₁Correct time point when zero crossing, as electric current I₁When zero crossing, controller Immediately to reverse-blocking tetrode thyristor K_bIssue shutdown control signal, reverse-blocking tetrode thyristor K_bIt turns off, is only opened at this time by magnetic latching relay immediately Close K_cCurrent supply circuit work is kept, combination switch devoting oneself to work to firewire C is so far completed；

(1-2) cuts off combination switch；

(1-2-1) first detects electric current I when the combination switch on firewire C to be cut off₁Correct time point when zero crossing, As electric current I₁When zero crossing, controller is immediately to reverse-blocking tetrode thyristor K_bIssue conductivity control signal, reverse-blocking tetrode thyristor K_bIt leads immediately Logical, delay a period of time makes reverse-blocking tetrode thyristor K_bReliable conducting；

(1-2-2) is in reverse-blocking tetrode thyristor K_bIn the case where conducting, electric current I is detected again₁Correct time point when zero crossing, As electric current I₁When zero crossing, controller is immediately to magnetic latching relay switch K_cIt issues and disconnects control signal, magnetic latching relay is opened Close K_cIt then turns off；

(1-2-3) then detects electric current I again₁Correct time point when zero crossing, as electric current I₁When zero crossing, controller Immediately to reverse-blocking tetrode thyristor K_bIssue shutdown control signal, reverse-blocking tetrode thyristor K_bIt turns off immediately；So far combination switch is from firewire C Upper excision completely.

The present invention can reach following effect:

Three-phase and four-line electric energy meter of the present invention energy when the unbalanced power for occurring being connected in each phase of three-phase and four-line electric energy meter It is low that a part load being connected in the three-phase and four-line electric energy meter high power phase line is switched to the three-phase and four-line electric energy meter in time In power phase line, switching electric current is small, and when switching will not burn out combination switch, and which not only adds the switchings of entire network load Flexibility also increases the reliability of phase line switching, can greatly improve the stability and reliability of operation of power networks, intelligence degree Height, good reliability, to easily carry out charge and discharge control to from the battery pack of electricity consumption power supply module.

Detailed description of the invention

Fig. 1 is a kind of use state schematic diagram of circuit principle connecting structure before switching of the embodiment of the present invention.

Fig. 2 is to allow in handoff procedure the sine-wave power for exporting isolating transformer and A phase voltage on the basis of Fig. 1 With a kind of use state schematic diagram of circuit principle connecting structure when amplitude same-phase.

Fig. 3 is to allow switch K1 and switch K17 to be closed on the basis of Fig. 2, and allow when switch K39 disconnection a kind of uses shape State schematic diagram of circuit principle connecting structure.

Fig. 4 is to allow switch K13 to be closed on the basis of Fig. 3, and switch K1 is allowed to disconnect, and makes the power supply of No.1 loading interfaces Power supply has been switched to a kind of use state schematic diagram of circuit principle connecting structure in C phase from A phase completely.

Fig. 5 is a kind of schematic diagram of circuit principle connecting structure of the embodiment of the present invention from electricity consumption power supply module.

Fig. 6 is that upper electromagnet from the No.1 bulk charging bindiny mechanism of electricity consumption power supply module of the embodiment of the present invention is pressed on down A kind of attachment structure schematic diagram when on electromagnet.

Fig. 7 is that upper electromagnet from the No.1 bulk charging bindiny mechanism of electricity consumption power supply module of the embodiment of the present invention is not pressed in A kind of attachment structure schematic diagram when on lower electromagnet.

Fig. 8 is that charger and microcontroller be all at the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module A kind of use state attachment structure schematic diagram when not powering on also.

Fig. 9 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, only micro-control A kind of use state attachment structure schematic diagram when the power input anode of device processed has been powered on.

Figure 10 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, only micro-control One kind that the power input anode of device processed powers on when also having been turned on power supply with the power input cathode of microcontroller makes With state attachment structure schematic diagram.

Figure 11 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, only micro-control The power input anode of device processed powers on, the power input cathode of microcontroller also has been turned on the electricity of power supply and charger Source input anode also has been turned on a kind of use state attachment structure schematic diagram when power supply.

Figure 12 is that the successive control mechanism of energization of the embodiment of the present invention from electricity consumption power supply module is in when powering on, microcontroller Power input anode power on, that the power input cathode of microcontroller also has been turned on power supply, the power supply of charger is defeated Enter a kind of use state that proper pole also has been turned on when power supply also has been turned on power supply with the power input cathode of charger to connect Structural schematic diagram.

Figure 13 is a kind of schematic diagram of circuit principle connecting structure that combination switch of the present invention is connected with controller and C phase.

Figure 14 is a kind of circuit theory connection structure schematic block diagram that present invention switch K1 to K42 is connected with controller.

Figure 15 is that the present embodiment is connect from a kind of circuit theory that each component of electricity consumption power supply module is connected with controller Structural schematic block diagram.

Specific embodiment

Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.

Embodiment: with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, referring to shown in Fig. 1-Figure 14, including three-phase Four line electric energy meter ontologies, three-phase and four-line electric energy meter ontology include A phase, B phase, C phase, zero curve N and three-phase electric energy metering module 110. It further include node J1, filter 104 and controller 107 and difference three-phase equilibrium monitor 101 connected to the controller, No.1 106, No. two voltage sampling circuit 102, Single-Phase Inverter Source 103, isolating transformer 105, memory 108 and of voltage sampling circuit Interface power monitor 109.The filter power input with the power output end of Single-Phase Inverter Source and isolating transformer respectively End connection, node J1 are connect with the sampling end of the power output end of isolating transformer and No. two voltage sampling circuits respectively, three-phase Electric energy metering module is connect with controller.The no-load voltage ratio of isolating transformer is greater than 1.17.

It further include control terminal switch Ki connected to the controller, wherein i is positive integer, i=1,1≤i≤42.

It further include 201, No. two loading interfaces of No.1 loading interfaces being connect respectively with the monitoring side of interface power monitor 202, No. three loading interfaces 205 of loading interfaces 204, five of loading interfaces 203, four and No. six loading interfaces 206.

Switch K40, switch K41 and switch K42 are the identical combination switch of circuit structure；It is shown in Figure 13, Combination switch includes 701, No. two nodes 702 of No.1 node, switching switch K_a, node M_a, inductance L_a, node M_b, capacitor C_a, two poles Pipe D₁, diode D₂, diode D₃, diode D₄, capacitor C₀, photoelectrical coupler OPT, resistance R₀, from electricity consumption power supply module 901, Magnetic driving circuit 502 and silicon driving circuit 503 switch switch K_aIncluding reverse-blocking tetrode thyristor K_bWith magnetic latching relay switch K_c, light Electric coupler OPT includes light emitting diode D₅With phototriode Q₀；Reverse-blocking tetrode thyristor K_bOne end and magnetic latching relay switch K_cOne end be connected on No.1 node 701, No.1 node 701 can only be connected to A phase, B phase in discontinuity surface when same In the wherein phase in this three-phase of C phase；Reverse-blocking tetrode thyristor K_bThe other end, magnetic latching relay switch K_cThe other end, inductance L_aOne end, diode D₁Positive terminal and diode D₃Negative pole end be all connected to node M_aOn, inductance L_aThe other end, capacitor One end of Ca and capacitor C₀One end be all connected to node M_bOn, the other end of capacitor Ca is connected on No. two nodes 702, and No. two Node 702 is connected on zero curve N, diode D₂Positive terminal and diode D₄Negative pole end be all connected to capacitor C₀The other end On, diode D₁Negative pole end and diode D₂Negative pole end be all connected to light emitting diode D₅Positive terminal on, diode D₃'s Positive terminal and diode D₄Positive terminal be all connected to light emitting diode D₅Negative pole end on, phototriode Q₀Emitter connect Ground, phototriode Q₀Collector respectively with resistance R₀One end connected with controller, resistance R₀The other end with from electricity consumption supply The connection of electric module, silicon driving circuit respectively with reverse-blocking tetrode thyristor K_bControl terminal connected with controller, Magnetic driving circuit respectively with Magnetic latching relay switch K_cControl terminal connected with controller.

Referring to shown in Fig. 5, Figure 15, from electricity consumption power supply module include battery connection module t22, can be mutually indepedent by several The battery pack t26 that is connected together in series of single battery；From electricity consumption power supply module further include respectively with single battery number Equal charger, switching switch and current limliting module；Battery connection module includes that the bulk charging equal with single battery number connects Connection mechanism；Bulk voltage detection chip t101 is respectively equipped in each bulk charging bindiny mechanism；The power supply of each charger exports It holds on an one-to-one terminals for being connected to each switching switch selection end；The one-to-one connection of turning end of each switching switch On one end of current limliting module, the one-to-one bulk charging connection machine for being connected to battery connection module of the other end of each current limliting module On structure；Battery connection module connects on the battery pack, and control terminal, each bulk voltage of the battery connection module t22 detects core The control terminal of piece t101, the control terminal of each current limliting module and each switching switch are connect with controller respectively；And in controller Control under, when not be battery pack charging when, battery connection module can by mutually independent single battery each in battery pack according to Secondary be connected in series becomes series-connected cell, and when for battery pack charging, battery connection module will can successively go here and there in battery pack Join the series-connected cell to link together and becomes mutually independent single battery.

Charger in this example is charger t2, charge t3 and charger t4.Switching switch in this example is switching Switch t5, switching switch t6 and switching switch t7.Current limliting module in this example is limited flow module t9, current limliting module t10 and limit Flow module t11.The selection end of each switching switch includes terminals d, terminals e and terminals f.Controller in this example As microcontroller.

It is shown in Figure 5, if there are three the single battery of the present embodiment battery pack is total, and set these three single batteries difference For No.1 single battery t19, No. two single battery t20 and No. three single battery t21；The bulk charging of battery connection module connects machine There are three structure is total, and setting these three bulk charging bindiny mechanisms is respectively No.1 bulk charging bindiny mechanism t12, No. two bulk chargings connections Mechanism t13 and No. three bulk charging bindiny mechanism t14；Battery connection module further includes a group power output interface t15, No.1 hilted broadsword pair Throw switch t17, No. two single-pole double-throw switch (SPDT) t18 and single knife switch t16；It is double that the anode of No.1 single battery is connected to No.1 hilted broadsword In the turning end of throw switch, the No.1 contact of No.1 single-pole double-throw switch (SPDT) is connected to the positive terminal of No.1 bulk charging bindiny mechanism On end, No. two contacts of No.1 single-pole double-throw switch (SPDT) are connected on No. two contacts of No. two single-pole double-throw switch (SPDT)s, No.1 monomer electricity The cathode in pond is connected in the negative terminals of No.1 bulk charging bindiny mechanism, and the cathode of No.1 single battery is also connected to a group electricity In the negative terminals of source output interface；The anode of No. two single batteries is connected to the positive terminal of No. two bulk charging bindiny mechanisms On end, the anode of No. two single batteries is also connected on the positive terminal of group power output interface, No. two single batteries it is negative Pole is connected in the negative terminals of No. two bulk charging bindiny mechanisms, and the cathode of No. two single batteries is also connected to single knife switch On one end；The negative pole t 25 of No. three single batteries is connected in the turning end of No. two single-pole double-throw switch (SPDT)s, No. two single-pole double-throw switch (SPDT)s No.1 contact be connected in the negative terminals of No. three bulk charging bindiny mechanisms, the positive t23 of No. three single batteries is connected to On the positive terminal of No. three bulk charging bindiny mechanisms, the anode of No. three single batteries is also connected to the other end of single knife switch On；The control terminal point of the control terminal of the No.1 single-pole double-throw switch (SPDT), the control terminal of No. two single-pole double-throw switch (SPDT)s and single knife switch It is not connect with controller.

No. two contacts of the No.1 single-pole double-throw switch (SPDT) and No. two contacts of No. two single-pole double-throw switch (SPDT)s are normally closed touching Point, in battery pack charging, No. two contacts of No.1 single-pole double-throw switch (SPDT) and No. two contacts of No. two single-pole double-throw switch (SPDT)s are in Off-state, No. two touchings of No. two contacts of No.1 single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s when battery pack and do not charge Point is in closed state；The No.1 contact of the No.1 single-pole double-throw switch (SPDT) and the No.1 contact of No. two single-pole double-throw switch (SPDT)s are equal For normally opened contact, the No.1 touching of the No.1 contact of No.1 single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s in battery pack charging Point is in closed state, the No.1 contact of No.1 single-pole double-throw switch (SPDT) and No. two single-pole double-throw switch (SPDT)s when battery pack and do not charge No.1 contact be in off-state；The single knife switch is in an off state when battery pack charges, and is not filled in battery pack Closed state is in when electric.

Referring to shown in Fig. 6, Fig. 7, each bulk charging bindiny mechanism includes sliding chamber t29, the lower horizontal block t30 that insulate, insulation cunning Horizontal block t36, sliding bar t32 and activity horizontal block t31, the positive terminal of bulk charging bindiny mechanism include upper on motion block t38, insulation Positive terminal end t28 and lower positive terminal end t27, the negative terminals of bulk charging bindiny mechanism include upper negative terminals Head t39 and lower negative terminal end t40；Insulated slide block is slidably arranged in intracavitary, and the lower horizontal block that insulate is fixed at insulation Cunning below sliding shoe is intracavitary, and the cunning that horizontal block is fixed above insulated slide block in insulation is intracavitary, activity horizontal block activity cloth The cunning set above the upper horizontal block that insulate is intracavitary, and upper positive terminal end and upper negative terminal end are arranged at insulated slide block On lower surface, lower positive terminal end and lower negative terminal end are arranged on the upper surface for the lower horizontal block that insulate, in insulation Horizontal block is equipped with vertical through-hole t34, and sliding bar is slidably arranged in vertical through-hole, and sliding bar upper end is fixedly connected on activity horizontal block On, sliding bar lower end is fixedly connected in the upper horizontal block of insulation, is set on the sliding bar between upper horizontal block and insulated slide block insulating Spring t37 is pulled open, the both ends for pulling open spring are press-connected on the lower surface for the upper horizontal block that insulate and insulated slide block respectively On upper surface；It is fixed with lower electromagnet t35 on the upper surface for insulating upper horizontal block, upper electromagnet is equipped in activity horizontal block T33, and the electromagnetic force generated when the energization of upper electromagnet attracts each other with the lower electromagnet electromagnetic force that electricity generates when logical, and powers on The electromagnetic force that electricity generates when the electromagnetic force and lower electromagnet that magnet generates when being powered are logical can push insulated slide block after attracting each other It moves down, and upper positive terminal end can be compressed and be conductively connected on lower positive terminal end and can be by upper negative terminals Head, which compresses, to be conductively connected on lower negative terminal end.

The anode of each single battery is one-to-one to be connected electrically on lower positive terminal end, the cathode one of each single battery It is connected electrically on lower negative terminal end to one, positive terminal in the one-to-one electrical connection of anode of the other end of each current limliting module On end, in the one-to-one electrical connection of cathode of the other end of each current limliting module on negative terminal end.

Referring to shown in Fig. 8-Figure 12, the power input of each charger and the power input of controller are conductively connected It is powered on successive control mechanism t75 at one, and the successive control mechanism that is powered when powering on first is powered to controller, then again It is powered to charger；The successive control mechanism that is powered in lower electricity first allows charger to power off, and then allows controller to power off again.

Referring to the successive control mechanism that shown in Fig. 8-Figure 12, is powered include right end sealing insulation tube t62, insulation bearing piece t64, Insulated slide bar t63 and handle t61, insulation bearing piece are fixed on t66 in insulation tube, are transversely provided with slide opening t65 in insulation bearing piece, Insulated slide bar is slidably arranged in sliding block, and handle is fixedly connected on the left end of insulated slide bar；Under the inner tubal wall of insulation tube No.1 positive terminal end t71, No.1 negative terminal end t72, No. two anodes are from left to right successively fixed on bottom surface to connect Line end t73 and No. two negative terminal end t74, and the height of No.1 positive terminal end is higher than No.1 negative terminal end Height it is high, the height that the height of No.1 negative terminal end is higher than No. two positive terminal ends is high, No. two positive terminal ends Height height be higher than No. two negative terminal ends height it is high；From a left side on the lower surface of the insulated slide bar of insulation bearing piece right To the right side be successively fixed with No. three positive terminal end t67, No. three negative terminal end t68, No. four positive terminal end t69 and No. four negative terminal end t70, and when insulated slide bar is moved to setting position, No. three positive terminal ends, which can compress, leads It is connected electrically on No.1 positive terminal end, No. three negative terminal ends can compress conductive connection in No.1 negative terminal end On, No. four positive terminal ends can compress conductive connection on No. two positive terminal ends, and No. four negative terminal ends can compress It is conductively connected on No. two negative terminal ends；The power input anode of controller is connected electrically in No.1 positive terminal end Lower end, the power input cathode of controller are connected electrically in the lower end of No.1 negative terminal end, the power input of charger Anode is connected electrically in the lower end of No. two positive terminal ends, and the power input cathode of charger is connected electrically in No. two negative terminals The lower end of end；No. three positive terminal ends and No. four positive terminal ends are both electrically connected in the power supply of successive control mechanism that is powered On the anode of input terminal；No. three negative terminal ends and No. four negative terminal ends are both electrically connected in the successive control mechanism that is powered On the cathode of power input.

Figure 13 is a kind of schematic diagram of circuit principle connecting structure that combination switch of the present invention is connected with controller and C phase. Combination switch and the connection circuit and combination switch of A phase and B phase are identical as the connection circuit of C phase.

When the present embodiment is in use, shown in Figure 1, it is assumed that under normal circumstances, No.1 loading interfaces and No. two loads Interface is powered by A phase, and No. three loading interfaces with No. four loading interfaces are powered by B phase, No. five loading interfaces and No. six Loading interfaces are powered by C phase.

The three-phase equilibrium monitor of the present embodiment is in setting time interval to the A phase of three-phase and four-line electric energy meter, B phase and C Power-balance monitoring is mutually carried out, and the data of monitoring are uploaded to controller, controller immediately uploads three-phase equilibrium monitor Data carry out calculation processing.If there is any two-phase after the data calculation processing that controller uploads three-phase equilibrium monitor When the difference of power is greater than the set value, then the maximum phase line of current power is found out, if the maximum phase line of current power is A phase.

Firstly, shown in Figure 1, it is assumed that before the handover, switch K1 to switch K20, switch K25, switch K26, switch K27, switch K28, switch K32, switch K33, switch K36, switch K37, switch K40, switch K41 and switch K42 are all in disconnected Open state, switch K21, switch K22, switch K23, switch K24, switch K29, switch K30, switch K31, switch K34, switch K35, switch K38 and switch K39 are all in closed state.

Then, referring to fig. 2, shown in Fig. 3, switch K42 closure connect C phase and Single-Phase Inverter Source, Single-Phase Inverter Source it is defeated Voltage signal out is using the voltage signal of A phase as reference, using the voltage signal that Single-Phase Inverter Source exports as feedback signal, Closed-loop control is constituted, generates the driving signal of SPWM in the controller, the voltage waveform for exporting Single-Phase Inverter Source is through filtering Stable sine-wave power is exported through isolating transformer again after device filtering.When the sine-wave power and A phase of isolating transformer output When voltage is with amplitude same-phase, it is closed at switch K1 and switch K17, and simultaneously switches off switch K39, at this time No.1 loading interfaces On power supply state or identical with the power supply status in A phase.

Then, shown in Figure 4, controller uses phase shifting control, and the voltage waveform for exporting Single-Phase Inverter Source is through filtering Stable sine-wave power is exported through isolating transformer again after the filtering of wave device.When the sine-wave power and C of isolating transformer output When phase voltage is with amplitude same-phase, switch K1 is disconnected, and be closed at switch K13, at this time the power supply electricity in No.1 loading interfaces Source state is just completely identical with the power supply status in C phase, i.e., the power supply of No.1 loading interfaces is switched to from A phase at this time C phase.

In the combination switch of the present embodiment, inductance L_aUsing high-frequency inductor, inductance L_aInductance be tens microhenrys.When can Control transwitch K_bOr magnetic latching relay switch K_cMoment is connected, the impedance of capacitor Ca is about 0, and due to inductance L_aPresence, electricity Feel L_aIn conducting moment, frequency changes very greatly, inductance L_aImpedance it is also very big, it is suppressed that the dash current of power supply conducting moment； When circuit works normally, since supply frequency is 50Hz power frequency, then inductance L_aImpedance very little.

As electric current I₂After positive zero crossing, the output signal U of photoelectrical coupler_I0Become low level from high level, due to Electric current I₂With electric current I₁Reversely, then there is the output signal U when photoelectrical coupler_I0When becoming high level from low level, electric current I₁Just In positive zero crossing.Therefore the output signal U of photoelectrical coupler_I0When becoming high level from low level, that is, obtain electric current I₁ Zero crossing electric current.When obtaining electric current I₁Zero crossing electric current when, controller can give magnetic latching relay switch K immediately_cHair Signal is opened or closed out.Allow magnetic latching relay switch K if necessary_cIt disconnects, then controller is just opened to magnetic latching relay Close K_cIt issues and disconnects control signal, magnetic latching relay switch K_cIt then turns off；Allow magnetic latching relay switch K if necessary_cIt closes It closes, then controller just gives magnetic latching relay switch K_cIssue closure control signal, magnetic latching relay switch K_cIt is closed immediately. The present embodiment opens magnetic latching relay further according to the correct time point from by obtaining correct time point when current zero-crossing point Close K_cThe control signal that is opened or closed is issued to make magnetic latching relay switch K_cContact be opened or closed, then flow through magnetic Guard relay switch K_cElectric current it is small, magnetic latching relay switch K is opened or closed in low current_c, so that magnetic keeps relay Device switch K_cContact be hardly damaged.To effectively extend magnetic latching relay switch K_cService life, and then extend compound The service life of switch.

The present embodiment is in reverse-blocking tetrode thyristor K_bIt is on and magnetic latching relay switch K_cWhen in closure, if to close Disconnected reverse-blocking tetrode thyristor K_b, then in electric current I₁Zero crossing Shi Cairang reverse-blocking tetrode thyristor K_bIt disconnects, it in this way can effective protection be silicon-controlled opens Close K_bService life.

The present embodiment is only in the reverse-blocking tetrode thyristor K that put into combination switch to C phase_bWhen throw when just using voltage over zero Enter, as long as all being put into or being cut off using current over-zero in the case where having electric current on combination switch, substantially increases compound The service life of switch, reliability is higher, and safety is preferable.

In the present embodiment, as reverse-blocking tetrode thyristor K_bWhen conducting, in magnetic latching relay switch K_cThere are no disconnect Under, magnetic latching relay switch K at this time_cIt is also conducting, i.e. reverse-blocking tetrode thyristor K_bWith magnetic latching relay switch K_cIt is same at this time When it is in the conductive state.Due to reverse-blocking tetrode thyristor K_bBranch has inductance L_aConducting resistance, it is clear that magnetic latching relay switch K_c The impedance of branch will be far smaller than reverse-blocking tetrode thyristor K_bThe impedance of branch, therefore flow through magnetic latching relay switch K_cElectric current it is big In flowing through reverse-blocking tetrode thyristor K_bThe electric current of branch.If magnetic latching relay switch K_cNot in current zero-crossing point break contact, easily damage Bad contact.The present embodiment is from by obtaining inductance L_aThe electric current I of branch₁Correct time point when zero crossing, then controller is allowed to issue Signal is controlled to disconnect magnetic latching relay switch K_cContact, allow magnetic latching relay switch K_cIt is closed when electric current is smaller It closes or disconnection movement, thus not easy burn-out magnetic latching relay switch K_cOn contact, effectively extend magnetic keep relay Device switch K_cService life, and then also extend the service life of combination switch, structure is simple, high reliablity.

It further include the accurate operating passing zero control method of combination switch, the accurate operating passing zero controlling party of the combination switch Method is as follows:

(1-1) puts into combination switch；

(1-2) cuts off combination switch；

The three-phase and four-line electric energy meter of the present embodiment works as the unbalanced power for occurring being connected in each phase of three-phase and four-line electric energy meter When can in time by be connected in the three-phase and four-line electric energy meter high power phase line a part load be switched to the three-phase and four-line electric energy In table low-power phase line, and the power supply phase line of each loading interfaces can arbitrarily switch, and switching electric current is small, and when switching will not burn out Combination switch.The three-phase and four-line electric energy meter not only increases the flexibility of entire network load switching, also increases phase line switching Reliability, the stability and reliability of operation of power networks can be greatly improved, structure is simple, and intelligence degree is high, good reliability.This Embodiment by acquisition current zero-crossing point, then issues control signal, combination switch is opened or closed in switching combination switch Contact, the small contact for being hardly damaged combination switch of switching electric current, effectively extends the service life of combination switch.

The successive control mechanism of the energization of the present embodiment is first powered by controller, and controller just allows battery connection module after being powered The series-connected cell for being sequentially connected in series together in battery pack is become into mutually independent single battery, is then electrified to successively control Mechanism just allows charger to be powered, and can be fully ensured that in this way when charger is powered, be mutually indepedent between each single battery , charging would not be impacted between each single battery.

For the present embodiment in charging, voltage checking chip can carry out voltage detecting to corresponding single battery.When some list Body battery can reduce charging current by current limliting module when being full of, and can pass through current limliting when some single battery is not full of far also Module increases charging current.To make voltage contained by single battery identical as far as possible.When each single battery is full of and each list The voltage of body battery can disconnect charge power supply when identical.Or when each single battery and underfill and each single battery Voltage it is identical when can also disconnect charge power supply.It, will not between the single battery of series connection after allowing single battery to be connected in this way There are electric current flowing, the high reliablity of battery.The charging current or charging voltage of each charger between each other can not be identical.Pass through Switching switch can select different chargers to some single battery.The cooperation of switching switch and current limliting module can be needed preferably The single battery to be charged provides charging current and charging voltage in real time, consequently facilitating to the charging progress of each single battery into Row individually control, is also convenient for individually controlling the charging voltage of each single battery.It is examined during the charging process by temperature The temperature of single battery can be detected by surveying mechanism, and can carry out overheat protector control to single battery in charging.Pass through Dual power supply mechanism makes the present embodiment have the function of dual power supply, substantially increases dependable with function.

The present embodiment can make the damage of single single battery will not influence other single battery chargings, and not be battery pack Mutually independent single battery each in battery pack can be sequentially connected in series when charging and become series-connected cell together, be electric The series-connected cell for being sequentially connected in series together in battery pack can be become mutually independent single battery when charging by pond group, to every The charging process of a single battery also can be carried out voltage detecting, and can the charging progress to each single battery individually controlled System, can also the charging voltage to each single battery individually controlled.And excess temperature guarantor can be carried out to single battery in charging Shield control.It is powered using dual power supply mechanism and realizes the uninterrupted power supply of electrical equipment.It is highly-safe, good reliability, and be equipped with logical Electric successively control mechanism, which powers on battery pack, first allows the single battery of series connection to become independent single battery in charging process After recharge, charge high reliablity.

The battery connection module of the present embodiment can will be each mutually indepedent in battery pack when battery pack can be allowed to charge well Single battery be sequentially connected in series and become series-connected cell together, can will be sequentially connected in series in battery pack when for battery pack charging The series-connected cell to link together becomes mutually independent single battery, high reliablity.

The present embodiment, which can improve battery pack in use, can remain each mutually independent list in battery pack Body battery is sequentially connected in series becomes series-connected cell together, easily automatically controlled to charge and discharge is carried out from the battery pack of electricity consumption power supply module System, high reliablity.

Embodiments of the present invention are described above in conjunction with attached drawing, however, the implementation is not limited to the above embodiments, this field Those of ordinary skill can be with various changes and modifications may be made within the scope of the appended claims.

Claims

1. with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, including three-phase and four-line electric energy meter ontology, three-phase and four-line electricity Energy table ontology includes A phase, B phase, C phase, zero curve N and three-phase electric energy metering module (110), which is characterized in that further includes node J1 With controller (107) and respectively three-phase equilibrium monitor (101) connected to the controller, No.1 voltage sampling circuit (102), Single-Phase Inverter Source (103), isolating transformer (105), No. two voltage sampling circuits (108) and interface power monitor (109)； The power output end of Single-Phase Inverter Source is connected with the power input of isolating transformer, node J1 respectively with isolating transformer The connection of the sampling end of power output end and No. two voltage sampling circuits, three-phase electric energy metering module are connect with controller；

It further include control terminal switch Ki connected to the controller, wherein i is positive integer, 1≤i≤42；

It further include node J18, node J14 and node J6, the zero line of node J18 is connected with A, the zero line and B of node J14 It is connected, the zero line of node J6 is connected with C；The zero curve of the zero line side of node J18, the zero line side of node J14 and node J6 End is all connect with zero curve N respectively；

Electrical energy measurement end, the monitoring side of three-phase equilibrium monitor and the adopting for No.1 voltage sampling circuit of three-phase electric energy metering module Sample end is all connect with node J18, node J14 and node J6 respectively；

The power input of Single-Phase Inverter Source is connect by switch K40 with node J18, the power input of Single-Phase Inverter Source It is connect by switch K41 with node J14, the power input of Single-Phase Inverter Source is connect by switch K42 with node J6；

It further include that the No.1 loading interfaces (201) connecting respectively with the monitoring side of the interface power monitor, No. two loads connect Mouth (202), No. three loading interfaces (203), No. four loading interfaces (204), No. five loading interfaces (205) and No. six loading interfaces (206)；

It further include node J2, node J3, node J4, node J5, node J7, node J8, node J9, node J10, node J11, section Point J12, node J13, node J15, node J16, node J17 and node J19；

The node J6, switch K13, node J2, switch K14, node J3, switch K15, node J4, switch K16, node J5 and No. six loading interfaces are sequentially connected in series, the node J6, switch K21, node J7, switch K22, node J8, switch K23, section Point J9, switch K24, node J10 and No. five loading interfaces are sequentially connected in series, and the node J14, switch K29, node J11, are opened Close K30, node J12, switch K31, node J13 and No. four loading interfaces are sequentially connected in series, the node J14, switch K34, Node J15, switch K35, node J16 and No. three loading interfaces are sequentially connected in series, the node J18, switch K38, node J17 It is sequentially connected in series with No. two loading interfaces, the node J18, switch K39, node J19 and No.1 loading interfaces are sequentially connected in series Connection；

The node J1, switch K1, node J2, switch K17 and node J19 are sequentially connected in series, the node J1, switch K2, Node J7, switch K25 and node J19 are sequentially connected in series, the node J1, switch K3, node J11, switch K32 and node J19 is sequentially connected in series, and the node J1, switch K4, node J15, switch K36 and node J19 are sequentially connected in series, the section Point J1, switch K5, node J3, switch K18 and node J17 are sequentially connected in series, the node J1, switch K6, node J8, switch K26 and node J17 are sequentially connected in series, and the node J1, switch K7, node J12, switch K33 and node J17 are sequentially connected in series company Connect, the node J1, switch K8, node J16, switch K37 and node J17 are sequentially connected in series, the node J1, switch K9, Node J4, switch K19 and node J16 are sequentially connected in series, the node J1, switch K10, node J9, switch K27 and node J16 is sequentially connected in series, and the node J1, switch K11, node J5, switch K20 and node J13 are sequentially connected in series, the section Point J1, switch K12, node J10, switch K28 and node J13 are sequentially connected in series；

The switch K40, switch K41 and switch K42 are the identical combination switch of circuit structure；The combination switch packet Include No.1 node (701), No. two nodes (702), switching switch K_a, node M_a, inductance L_a, node M_b, capacitor Ca, diode D₁、 Diode D₂, diode D₃, diode D₄, capacitor C₀, photoelectrical coupler OPT, resistance R₀, from electricity consumption power supply module (901), magnetic drive Dynamic circuit (502) and silicon driving circuit (503), switch switch K_aIncluding reverse-blocking tetrode thyristor K_bWith magnetic latching relay switch K_c, institute Stating photoelectrical coupler OPT includes light emitting diode D₅With phototriode Q₀；The reverse-blocking tetrode thyristor K_bOne end and magnetic keep after Electric switch K_cOne end be connected on No.1 node (701), when same in discontinuity surface the No.1 node (701) only It can be connected in the wherein phase in A phase, B phase and C phase this three-phase；The reverse-blocking tetrode thyristor K_bThe other end, magnetic keep relay Device switch K_cThe other end, inductance L_aOne end, diode D₁Positive terminal and diode D₃Negative pole end be all connected to node M_a On, the inductance L_aThe other end, capacitor Ca one end and capacitor C₀One end be all connected to node M_bOn, the capacitor Ca's The other end is connected on No. two nodes (702), and No. two nodes (702) are connected on zero curve N, the diode D₂Anode End and diode D₄Negative pole end be all connected to capacitor C₀The other end on, diode D₁Negative pole end and diode D₂Cathode End is all connected to light emitting diode D₅Positive terminal on, diode D₃Positive terminal and diode D₄Positive terminal be all connected to hair Optical diode D₅Negative pole end on, the phototriode Q₀Emitter ground connection, the phototriode Q₀Collector difference With resistance R₀One end connected with controller, resistance R₀The other end connect with from electricity consumption power supply module, the silicon driving circuit point Not with reverse-blocking tetrode thyristor K_bControl terminal connected with controller, the Magnetic driving circuit respectively with magnetic latching relay switch K_c's Control terminal is connected with controller；

From electricity consumption power supply module include battery connection module, can be sequentially connected in series by several mutually independent single batteries and At battery pack；It further include charger equal with single battery number respectively, switching switch and current limliting from electricity consumption power supply module Module；Battery connection module includes the bulk charging bindiny mechanism equal with single battery number；In each bulk charging bindiny mechanism On be respectively equipped with bulk voltage detection chip；The power output end of each charger is one-to-one to be connected to each switching switch selection end A terminals on；On one-to-one one end for being connected to current limliting module of turning end of each switching switch, each current limliting module The one-to-one bulk charging bindiny mechanism for being connected to battery connection module of the other end on；Battery connection module is connected to battery pack On, the control terminal of the battery connection module, each bulk voltage detection chip, the control terminal and each switching of each current limliting module The control terminal of switch is connect with controller respectively；And under the control of the controller, when not being battery pack charging, battery connects mould Mutually independent single battery each in battery pack can be sequentially connected in series by block becomes series-connected cell together, when for battery pack When charging, the series-connected cell for being sequentially connected in series together in battery pack can be become mutually independent monomer by battery connection module Battery；

The power input of each charger and the power input of controller are conductively connected the successively control machine that is powered at one On structure, and the successive control mechanism that is powered when powering on first is powered to controller, then gives charger to be powered again；It is logical in lower electricity Electric successively control mechanism first allows charger to power off, and then allows controller to power off again.

2. according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, which is characterized in that also wrap Include memory connected to the controller (106).

3. according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, which is characterized in that also wrap Filter (104) are included, filter is connected in series in the power output end of Single-Phase Inverter Source and the power input of isolating transformer On line between end.

4. according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, which is characterized in that isolation The no-load voltage ratio of transformer is greater than 1.17.

5. according to claim 1 with the accurate three-phase and four-line electric energy meter for crossing zero phase line switching, which is characterized in that also wrap The accurate operating passing zero control method of combination switch is included, the accurate operating passing zero control method of the combination switch is as follows:

(1-1) puts into combination switch；

(1-1-1) first detects voltage U on firewire C when to put into combination switch to firewire C_CNCorrect time point when zero crossing, As voltage U_CNWhen zero crossing, controller is immediately to reverse-blocking tetrode thyristor K_bIssue conductivity control signal, reverse-blocking tetrode thyristor K_bIt leads immediately It is logical；

(1-1-2) is as reverse-blocking tetrode thyristor K_bAfter setting time is connected, electric current I is first detected₁Correct time point when zero crossing, works as electricity Flow I₁When zero crossing, controller is immediately to magnetic latching relay switch K_cIssue closure control signal, magnetic latching relay switch K_c It is closed immediately；I₁For inductance L_aElectric current；

(1-1-3) then detects electric current I again₁Correct time point when zero crossing, as electric current I₁When zero crossing, controller is immediately To reverse-blocking tetrode thyristor K_bIssue shutdown control signal, reverse-blocking tetrode thyristor K_bIt turns off immediately, at this time only by magnetic latching relay switch K_c Current supply circuit work is kept, combination switch devoting oneself to work to firewire C is so far completed；

(1-2) cuts off combination switch；

(1-2-1) first detects electric current I when the combination switch on firewire C to be cut off₁Correct time point when zero crossing, works as electric current I₁When zero crossing, controller is immediately to reverse-blocking tetrode thyristor K_bIssue conductivity control signal, reverse-blocking tetrode thyristor K_bIt is connected, is delayed immediately A period of time makes reverse-blocking tetrode thyristor K_bReliable conducting；

(1-2-2) is in reverse-blocking tetrode thyristor K_bIn the case where conducting, electric current I is detected again₁Correct time point when zero crossing, works as electricity Flow I₁When zero crossing, controller is immediately to magnetic latching relay switch K_cIt issues and disconnects control signal, magnetic latching relay switch K_c It then turns off；

(1-2-3) then detects electric current I again₁Correct time point when zero crossing, as electric current I₁When zero crossing, controller is immediately To reverse-blocking tetrode thyristor K_bIssue shutdown control signal, reverse-blocking tetrode thyristor K_bIt turns off immediately；So far combination switch is complete from firewire C Full excision.