CN206542196U - And off-network output switching circuit - Google Patents

Abstract

The utility model is provided and off-network output switching circuit, is belonged to field of electrical equipment, is connected between inverter and power network, and switching circuit includes the first output port and the second output port being arranged on inverter；First output port includes the first Wiring port being connected with the live wire of power network, and with to the first supply port for being powered of load, second input port includes the second Wiring port being connected with the zero line of power network, and to the second supply port that load is powered, at least two relays are provided with the circuit residing for each Wiring port and supply port.Pass through the difference according to power network power supply mode, relay on different circuits is controlled, the switching to load supplying mode is completed, the expense for buying special external dual-power transfer switch can be removed from, without buying associated satellite part, so as to reduce purchase cost.

Description

And off-network output switching circuit

Technical field

The utility model belongs to field of electrical equipment, more particularly to and off-network output switching circuit.

Background technology

It is often practical to arrive and the integral inverter of off-network in existing power equipment, according to the difference of use demand, inverterState switching can be carried out between grid-connected input and off-network output, the state switching of inverter needs practical external dual power supply to turnChange switch.

This dual-power transfer switch procurement price for inverter is very high, while using the dual-power transfer switchWhen, in addition it is also necessary to Special wiring and mounting box are purchased, purchase cost is improved.

Utility model content

In order to solve shortcoming and defect present in prior art, the utility model, which is provided, to be used for by simplifying circuit knotThe mode of structure lowers purchase cost.

In order to reach above-mentioned technical purpose, the utility model is provided and off-network output switching circuit, the switching circuitIt is connected between inverter and power network, the switching circuit includes the first output port being arranged on inverter and the second outputPort；

First output port includes the first Wiring port for being connected with the live wire of power network, and with to loading what is be poweredFirst supply port, the second input port includes the second Wiring port being connected with the zero line of power network, and load is suppliedSecond supply port of electricity；

Wherein, the first relay S1, the second relay S2 are provided with the circuit residing for the first Wiring port, is connect secondCircuit residing for line end mouthful is provided with the 3rd relay S3, the 4th relay S4, is set on the circuit residing for the first supply portHave the 5th relay S5, the 6th relay S6, on the circuit residing for the second supply port provided with the 7th relay S7, the 8th afterElectrical equipment S8.

Optionally, break-make part is provided between the first Wiring port and the first supply port.

Optionally, the break-make part is additionally arranged between the second Wiring port and the first supply port.

Optionally, the break-make part is the 9th relay S9 or contactor.

Optionally, it is parallel with circuit for detecting on the loop residing for break-make part.

Optionally, off-network filter capacitor is provided between the second Wiring port and the second supply port.

Optionally, signal transmission circuit is provided with any relay into the 8th relay S8 in the first relay S1.

The beneficial effect brought of technical scheme that the utility model is provided is：

The utility model is provided and off-network output switching circuit, is connected between inverter and power network, switching circuit bagInclude the first output port and the second output port being arranged on inverter；First output port includes being connected with the live wire of power networkThe first Wiring port, and with to the first supply port for being powered of load, the second input port includes zero with power networkThe second connected Wiring port of line, and to the second supply port that load is powered, in each Wiring port and feeder earCircuit residing for mouthful is provided with least two relays.By the difference according to power network power supply mode, on different circuits afterElectrical equipment is controlled, and completes the switching to load supplying mode, can remove the special external dual-power transfer switch of purchase fromExpense, without buying associated satellite part, so as to reduce purchase cost.

Brief description of the drawings

In order to illustrate more clearly of the technical solution of the utility model, used required in being described below to embodimentAccompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present utility model, forFor those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawingsAccompanying drawing.

Fig. 1 is the structural representation of the utility model offer and off-network output switching circuit.

Embodiment

To make structure of the present utility model and advantage clearer, structure of the present utility model is made below in conjunction with accompanying drawingIt is further described through.

Embodiment one

The utility model is provided and off-network output switching circuit, the switching circuit be connected to inverter and power network itBetween, the switching circuit includes the first output port and the second output port being arranged on inverter；

First output port includes the first Wiring port for being connected with the live wire of power network, and with to loading what is be poweredFirst supply port, the second input port includes the second Wiring port being connected with the zero line of power network, and load is suppliedSecond supply port of electricity；

Wherein, the first relay S1, the second relay S2 are provided with the circuit residing for the first Wiring port, is connect secondCircuit residing for line end mouthful is provided with the 3rd relay S3, the 4th relay S4, is set on the circuit residing for the first supply portHave the 5th relay S5, the 6th relay S6, on the circuit residing for the second supply port provided with the 7th relay S7, the 8th afterElectrical equipment S8.

In force, eliminate dual-power transfer switch, using the relatively simple switching circuit of structure can just realize withDual-power transfer switch identical function, in actual use, simultaneously should be connected inverter and electricity by off-network output switching circuitBetween net, the status adjustment for being powered according to power network is powered to the load being connected on inverter.

As shown in figure 1, simultaneously off-network output switching circuit should specifically include：

It is arranged on the first output port 1 and the second output port 2 on inverter；

First output port 1 includes the first Wiring port 11 being connected with the live wire of power network, and with supplying loadFirst supply port 21 of electricity, the second input port 2 includes the second Wiring port 12 being connected with the zero line of power network, and to negativeCarry the second supply port 22 being powered；

Wherein, the first relay S1, the second relay S2 are provided with the circuit residing for the first Wiring port, is connect secondCircuit residing for line end mouthful is provided with the 3rd relay S3, the 4th relay S4, is set on the circuit residing for the first supply portHave the 5th relay S5, the 6th relay S6, on the circuit residing for the second supply port provided with the 7th relay S7, the 8th afterElectrical equipment S8.

Here the first output port 1 and the second output port 2 is respectively as grid-connected delivery outlet and off-network delivery outlet, differenceNormally or under power network abnormality the mode powered to the load is changed for power network.Pass through 2 relays on L, N line of power networkDevice (i.e. S1, S2 and S3, S4) is connected to relay on inverter internal circuit, two lines road respectively by the inside of inverterChip controls, prevent single failure, so as to reach the purpose of redundancy.

In actual use, when power network is powered it is normal when, inverter is in normal grid-connected state, now first afterElectrical equipment S1, the second relay S2, the 3rd relay S3 and the 4th relay S4 are in closed communicating state, and the 5th relayS5, the 6th relay S6, the 7th relay S7, the 8th relay S8 are in the state disconnected, and now inverter is to power network and bearsCarry power supply.

And when electric network power-fail, the first relay S1, the second relay S2, the 3rd relay S3 and the 4th relay S4It is off, now whether inverter can detect break-make part D in the state reliably disconnected by circuit for detecting, ifConfirm in the state reliably disconnected, then to control the 5th relay S5, the 6th relay S6, the 7th relay S7, the 8th relayDevice S8 is adjusted to closure UNICOM state, and inverter enters off-network mode of operation so that inverter powers to the load.

In the latter case, if electric on power network, inverter is first by the 5th relay S5, the 6th relay S6, theSeven relay S7, the 8th relay S8 are disconnected, so as to exit off-network mode of operation, are then controlled break-make part D connections, are madePower network is powered to load component, and when other parameters of electric power reach standard, by the first relay of inverter control S1, secondRelay S2, the 3rd relay S3 and the 4th relay S4 are adjusted to connected state so that inverter enters collaboration power networkGenerate electricity by way of merging two or more grid systems pattern.

Break-make part D in this switching circuit, can be to make between the first Wiring port 11 and the second Wiring port 12With relay or contactor.Here break-make part D installation site can also be arranged on the first Wiring port 11 and the first power supplyBetween port 21.

In addition to the monitoring degree for external condition of this and off-network output switching circuit is improved, in break-make part DCircuit for detecting is also parallel with residing loop, circuit for detecting can detect the letter that break-make part D repeat circuits or contactor are providedNumber or take the signal of circuit formation and be sent to chip in inverter, to ensure and when relay between off-network or contactor failureMachine will not enter off-network pattern, prevent danger.In addition, being set between the second Wiring port 12 and the second supply port 22There is off-network filter capacitor C1.So, grid-connected isolation capacitance and isolation filter electric capacity during off-network can with different, it is grid-connected and fromThe filtering parameter of net can be adjusted respectively.Grid-connected and off-grid filtering parameter can be adjusted to optimal simultaneously, improve systemStability, improves respective filtering performance.

In addition, being provided with signal transmission circuit on any relay into the 8th relay S8 in the first relay S1.MakeThe contact all the way that signal can be sent in single failure or have interlocking by obtaining can be barricaded as circuit sending signal with external circuit,Control unit is enabled to recognize the relay or contactor failure.

The utility model is provided and off-network output switching circuit, is connected between inverter and power network, switching circuit bagInclude the first output port and the second output port being arranged on inverter；First output port includes being connected with the live wire of power networkThe first Wiring port, and with to the first supply port for being powered of load, the second input port includes zero with power networkThe second connected Wiring port of line, and to the second supply port that load is powered, in each Wiring port and feeder earCircuit residing for mouthful is provided with least two relays.By the difference according to power network power supply mode, on different circuits afterElectrical equipment is controlled, and completes the switching to load supplying mode, can remove the special external dual-power transfer switch of purchase fromExpense, without buying associated satellite part, so as to reduce purchase cost.

Each sequence number in above-described embodiment is for illustration only, and the elder generation during the assembling or use of each part is not representedAfterwards sequentially.

Embodiment of the present utility model is the foregoing is only, it is all in the utility model not to limit the utility modelSpirit and principle within, any modification, equivalent substitution and improvements made etc. should be included in protection model of the present utility modelWithin enclosing.

Claims (7)

1. and off-network output switching circuit, the switching circuit is connected between inverter and power network, it is characterised in that described to cutChange the first output port and the second output port that circuit includes being arranged on inverter；

First output port includes the first Wiring port for being connected with the live wire of power network, and with to loading be powered firstSupply port, the second input port includes the second Wiring port being connected with the zero line of power network, and to loading what is be poweredSecond supply port；

Wherein, the first relay S1, the second relay S2 are provided with the circuit residing for the first Wiring port, in the second terminalsCircuit residing for mouthful is provided with the 3rd relay S3, the 4th relay S4, provided with the on the circuit residing for the first supply portFive relay S5, the 6th relay S6, are provided with the 7th relay S7, the 8th relay on the circuit residing for the second supply portS8。

2. according to claim 1 and off-network output switching circuit, it is characterised in that supplied in the first Wiring port and firstBreak-make part is provided between electric port.

3. according to claim 2 and off-network output switching circuit, it is characterised in that the break-make part is additionally arranged atBetween two Wiring ports and the first supply port.

4. according to Claims 2 or 3 and off-network output switching circuit, it is characterised in that the break-make part is the 9thRelay S9 or contactor.

5. according to claim 2 and off-network output switching circuit, it is characterised in that on the loop residing for break-make partIt is parallel with circuit for detecting.

6. according to claim 1 and off-network output switching circuit, it is characterised in that supplied in the second Wiring port and secondOff-network filter capacitor is provided between electric port.

7. according to claim 1 and off-network output switching circuit, it is characterised in that the first relay S1 to the 8th afterAny relay in electrical equipment S8 is provided with signal transmission circuit.