CN209072140U - Photovoltaic power consumption equipment and charging control circuit thereof - Google Patents
Photovoltaic power consumption equipment and charging control circuit thereof Download PDFInfo
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- CN209072140U CN209072140U CN201821724088.1U CN201821724088U CN209072140U CN 209072140 U CN209072140 U CN 209072140U CN 201821724088 U CN201821724088 U CN 201821724088U CN 209072140 U CN209072140 U CN 209072140U
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Abstract
The utility model discloses an electric equipment for photovoltaic and charge control circuit thereof. The charge control circuit includes: the charging relay circuit comprises a double relay circuit and a charging relay circuit, wherein the double relay circuit is arranged between a network side circuit and a machine side circuit of the photovoltaic electric equipment; and the charging relay circuit is used for being closed to realize the smooth charging of the bus capacitor under the condition that the double-relay circuit is not closed. The utility model discloses an increase charging relay circuit at alternating current power supply side, when double relay is not closed from this, can realize the mild charging to bus-bar capacitance through closed charging relay.
Description
Technical field
The utility model relates to photovoltaic electrical equipment field, in particular to a kind of photovoltaic electrical equipment and its charge control electricity
Road.
Background technique
For grid-connected AC-DC converter, between photovoltaic and AC network, safety requirement should have therebetween electrically every
From, thus between there are AC relay, the IEC62109-2 (safety of photovoltaic generating system power conversion apparatus: inverse in addition
Become device means suitable) requirement to relay redundancy structure, generally meet photovoltaic converter all double relay knots of authentication requesting
Structure.
Utility model content
Applicant thinks: in double relay structure, there are problems that two, fills first is that dc-link capacitance can not be solved
Electricity, second is that being unable to satisfy IEC certification to the failure detection of relay single failure.
The relevant technologies provide whether one kind is accurately detecting each relay in the application of photovoltaic combining inverter
While failure, while inverter output capacitance voltage is handled, eliminates grid-connected inverters moment power grid to filtering
Capacitor causes the possibility of rush of current.As shown in Figure 1, network voltage detection and 2 inverter voltage inspections of the relevant technologies by 1 point
It surveys, realizes said effect in conjunction with certain actuating of relay strategy.It should be noted that in photovoltaic combining inverter, bus
The charging of capacitor is realized by photovoltaic module.If DC side is not charged without photovoltaic, control loop does not have yet
Electricity, even if exchange has electricity, relay will not be acted.
It is different from this kind of pure generating equipment of photovoltaic DC-to-AC converter, PV air-conditioner will not only be realized as hair electricity integrated equipment
Photovoltaic grid-connected inversion when photovoltaic is plentiful, it is often more important that guarantee the normal fortune of outdoor machine of air-conditioner when exchanging normal power supply
Row.On the basis of this electricity consumption preferential design concept, it is desirable that when even without photovoltaic, outdoor machine of air-conditioner also will be transported normally
Row, therefore the mode (by photovoltaic module) of photovoltaic DC-to-AC converter can not be used for dc-link capacitance charging.
It cannot achieve to charge to bus circuit in view of AC power source lateral circuit in the relevant technologies photovoltaic electrical equipment circuit and control
The technical issues of processed, the utility model provide a kind of photovoltaic electrical equipment and its charging control circuit, increase in alternating current source
Add charge circuit to realize the charge control to bus capacitor.
One aspect according to the present utility model provides a kind of charging control circuit, including double relay circuit and charging
Relay circuit, in which:
Double relay circuit is arranged between the circuit on side of overhead contact line of photovoltaic electrical equipment and pusher side circuit；
Charge relay circuit, for being closed to realize to bus capacitor in the case where double relay circuit is not closed
Gentle charging.
In some embodiments of the utility model, the charge relay circuit includes charge relay and charging electricity
Resistance.
In some embodiments of the utility model, the charge relay circuit is connected across the two of double relay circuit
End.
In some embodiments of the utility model, one end and the circuit on side of overhead contact line and double relays of the charge relay circuit
The tie point of device circuit is connected, and the other end of the charge relay circuit is connect with DC bus.
In some embodiments of the utility model, the double relay circuit include the first relay, the second relay,
Third relay and the 4th relay, in which:
First relay and the second relay are connected in series on zero curve；
Third relay and the 4th relay are connected in series on firewire.
In some embodiments of the utility model, first relay, the second relay, third relay and the 4th
Relay is four individual AC relays.
In some embodiments of the utility model, the double relay circuit includes two groups of biswitch relays, in which:
First biswitch relay includes the first relay and third relay；
Second biswitch relay includes the second relay and the 4th relay.
In some embodiments of the utility model, the charging control circuit further includes first voltage detection device,
Two voltage check devices and battery charge controller, in which:
First voltage detection device, for detect photovoltaic electrical equipment circuit on side of overhead contact line and double relay circuit connection at
Voltage on line side；
Second voltage detection device, for detect photovoltaic electrical equipment pusher side circuit and double relay circuit connection at
Pusher side voltage；
Battery charge controller, for according to voltage on line side and pusher side voltage control charge relay circuit and double relay electricity
The on-off on road, and/or, according to voltage on line side and pusher side voltage ascertaining circuit fault type.
In some embodiments of the utility model, the charging control circuit further includes tertiary voltage detection device,
In:
Tertiary voltage detection device, for detecting DC bus-bar voltage；
Battery charge controller, for controlling charge relay electricity according to DC bus-bar voltage, voltage on line side and pusher side voltage
The on-off on road and double relay circuit, and/or, according to DC bus-bar voltage, voltage on line side and pusher side voltage ascertaining circuit failure
Type.
Another aspect according to the present utility model provides a kind of photovoltaic electrical equipment, including such as above-mentioned any embodiment institute
The charging control circuit stated.
The utility model is by increasing charge relay circuit in alternating current source, thus when double relay is not closed,
The gentle charging to bus capacitor can be realized by closure charge relay.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of the utility model the relevant technologies photovoltaic combining inverter double relay structure.
Fig. 2 is the schematic diagram of some embodiments of the utility model charging control circuit.
Fig. 3 is the schematic diagram of other embodiments of the utility model charging control circuit.
Fig. 4 is the schematic diagram of the other embodiment of the utility model charging control circuit.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to this is practical
Novel and its application or any restrictions used.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, is fallen within the protection scope of the utility model.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
Up to the unlimited the scope of the utility model processed of formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Fig. 2 is the schematic diagram of some embodiments of the utility model charging control circuit.As shown in Fig. 2, the charge control
Circuit may include double relay circuit and charge relay circuit, in which:
Double relay circuit is arranged between the circuit on side of overhead contact line of photovoltaic electrical equipment and pusher side circuit.
In some embodiments of the utility model, the photovoltaic electrical equipment can be PV air-conditioner.
In some embodiments of the utility model, the circuit on side of overhead contact line can be the circuit of AC network side.
In some embodiments of the utility model, as shown in Fig. 2, the circuit on side of overhead contact line may include filter band and exchange
Power supply.
In some embodiments of the utility model, the pusher side circuit can be photovoltaic electrical equipment side and photovoltaic side electricity
Road.
In some embodiments of the utility model, as shown in Fig. 2, the pusher side circuit may include reactor, AC/DC
Power module and photovoltaic apparatus.
In some embodiments of the utility model, as shown in Fig. 2, the double relay circuit can be set in net side electricity
Between the filter band on road and the reactor of pusher side circuit.
Charge relay circuit, for being closed to realize to bus capacitor in the case where double relay circuit is not closed
Gentle charging.
In some embodiments of the utility model, as shown in Fig. 2, the charge relay circuit may include charging after
Electric appliance RLY_C and charging resistor R.
In some embodiments of the utility model, as shown in Fig. 2, the charge relay circuit is connected across double relay
The both ends of circuit.
Fig. 3 is the schematic diagram of other embodiments of the utility model charging control circuit.As shown in figure 3, it is described charging after
One end of appliance circuit is connected with circuit on side of overhead contact line with the tie point of double relay circuit, the other end of the charge relay circuit
It is connect by rectifier bridge with DC bus.
In some embodiments of the utility model, as shown in Figures 2 and 3, the double relay circuit may include
One relay RLY1, the second relay RLY2, third relay RLY3 and the 4th relay RLY4, in which:
First relay RLY1 and the second relay RLY2 are connected in series on zero curve N.
Third relay RLY3 and the 4th relay RLY4 are connected in series on firewire L.
In some embodiments of the utility model, the first relay RLY1, the second relay RLY2, third relay
Device RLY3 and the 4th relay RLY4 is four individual AC relays.
In other embodiments of the utility model, the double relay circuit may include two groups as shown in Figure 1
Biswitch relay, in which:
First biswitch relay includes the first relay RLY1 and third relay RLY3.
Second biswitch relay includes the second relay RLY2 and the 4th relay RLY4.
The biswitch relay of the utility model above-described embodiment is considered as a device, and biswitch relay can lead to
A signal is crossed, while open and close is carried out to two relays.Such as RLY1 and RLY3 is one group, RLY2 and RLY4 are one
Group.The utility model above-described embodiment can control two group relays with two control signals.
In some embodiments of the utility model, as shown in Figures 2 and 3, the charging control circuit can also include
First voltage detection device 1 and second voltage detection device 2, in which:
Fig. 4 is the schematic diagram of the other embodiment of the utility model charging control circuit.As shown in figure 4, Fig. 2 and Fig. 3 is real
The charging control circuit for applying example can also include battery charge controller 4, in which:
First voltage detection device 1 and second voltage detection device 2 are connect with battery charge controller 4 respectively.
Battery charge controller 4 also respectively with charge relay RLY_C, the first relay RLY1, the second relay RLY2,
Three relay RLY3 and the 4th relay RLY4 connection.
First voltage detection device 1, for detect photovoltaic electrical equipment circuit on side of overhead contact line and double relay circuit connection at
Voltage on line side V1.
Second voltage detection device 2, for detect photovoltaic electrical equipment pusher side circuit and double relay circuit connection at
Pusher side voltage V2.
Battery charge controller 4, for controlling charge relay RLY_C, the first relay according to voltage on line side and pusher side voltage
The on-off of device RLY1, the second relay RLY2, third relay RLY3 and the 4th relay RLY4；And/or according to voltage on line side
With pusher side voltage ascertaining circuit fault type.
In some embodiments of the utility model, battery charge controller 4 can be used for judging such as above-mentioned any embodiment
Whether the double relay circuit in the charging control circuit is closed；And in the case where double relay circuit is not closed, close
Charge relay circuit is closed, to realize the gentle charging to bus capacitor.
In some embodiments of the utility model, as shown in Figure 2, Figure 3 and Figure 4, the charging control circuit can be with
Including tertiary voltage detection device 3, in which:
Tertiary voltage detection device 3 is connect with battery charge controller 4.
Tertiary voltage detection device 3, for detecting DC bus-bar voltage Vdc.
In some embodiments of the utility model, the DC side of DC/AC is arranged in tertiary voltage detection device 3, to containing
The system of photovoltaic DC, there are also DC-DC converter, D.C. contactor and filtering between tertiary voltage detection device 3 and photovoltaic cell
Plate.It is also to have D.C. contactor and filtering between tertiary voltage detection device 3 and photovoltaic cell even if the system for being free of photovoltaic DC
Plate, only when contactor is closed, tertiary voltage detection device 3 and photovoltaic cell are only a potential point.
Battery charge controller 4, for controlling charge relay according to DC bus-bar voltage, voltage on line side and pusher side voltage
The on-off of RLY_C, the first relay RLY1, the second relay RLY2, third relay RLY3 and the 4th relay RLY4；With/
Or, according to DC bus-bar voltage, voltage on line side and pusher side voltage ascertaining circuit fault type.
Based on the utility model charging control circuit provided by the above embodiment, by charging back in the increase of alternating current source
Road, it is possible thereby to realize the charge control to bus capacitor.The utility model above-described embodiment will exchange side charge relay
(RLY_C) and charging resistor is connected across double relay both ends, in the case where double relay is not closed, can be charged by closure
Relay realizes the gentle charging to bus capacitor.The utility model above-described embodiment also achieves friendship on the basis of this circuit
The adhesion and open circuit detection of current relay, and the inhibition to filter capacitor impact.
In some embodiments of the utility model, as shown in Figures 2 and 3, the charging control circuit can also include
Filter capacitor C, in which:
Filter capacitor C is arranged between second voltage detection device 2 and reactor.
For the charging control circuit of Fig. 2 embodiment, due to the presence of charging resistor, filter capacitor never charge,
To first time charging (closure charge relay give bus capacitor charging), due to this charging process by charging resistor and charging after
Electric appliance is connected to power grid realization, charging resistor current limiting or so, therefore the utility model above-described embodiment can inhibit filtered electrical
Hold the impact of C.And the circuit structure of Fig. 3, this inhibitory effect can not be reached.
In the utility model above-described embodiment, the adhesion and open circuit inspection of AC relay is may be implemented in battery charge controller 4
The fault detections such as survey, and the inhibition to filter capacitor impact.
It is described below by function of the specific embodiment to the utility model battery charge controller 4.
The charge circuit control of the utility model above-described embodiment carries out dc-link capacitance indeed through resistance
Charging, is then closed the 4th relay RLY4 of the first relay RLY1-, finally bypasses the control process of charging resistor.Wherein need
The failure of the 4th relay RLY4 of first relay RLY1- is detected.
There are two types of the failures of the 4th relay RLY4 of the first relay of the utility model above-described embodiment RLY1-: open circuit and
Short-circuit (adhesion).
In some embodiments of the utility model, battery charge controller 4 can be used for executing following charge circuit
Control and relay failure detection operation:
Step 1, into charge circuit control and relay failure Detection task.
Step 2, battery charge controller 4 judges the virtual value of voltage on line side after entering task and the virtual value of pusher side voltage is
It is no to meet first condition, wherein first condition is in preset range for the virtual value of voltage on line side V1, and pusher side voltage V2
Virtual value is less than predetermined value.In the case where the virtual value of the virtual value of voltage on line side and pusher side voltage meets first condition, hold
Row step 3；Otherwise, in the case where the virtual value of the virtual value of voltage on line side and pusher side voltage is unsatisfactory for first condition, not into
The control of row recharge logic, executes step 18, that is, and determine relay failure, quotes the message of relay failure failure outward,
In, relay failure failure is the first relay RLY1 to the 4th relay RLY4 all short circuits in this case.
In some embodiments of the utility model, the preset range is 10V-280V.
In some embodiments of the utility model, the predetermined value is 50V.
Step 3, battery charge controller 4 is closed charge relay RLY_C, starts to charge to bus capacitor.
In some embodiments of the utility model, for the charging control circuit of Fig. 2 embodiment, due to charging resistor
Presence, filter capacitor never charge, to charging (closure charge relay give bus capacitor charging) for the first time, since this is filled
Electric process is connected to power grid by charging resistor and charge relay and realizes, charging resistor current limiting or so, therefore this is practical new
Type above-described embodiment can inhibit the impact of filter capacitor C.And the circuit structure of Fig. 3, this inhibitory effect can not be reached.
Step 4, in closure the first predetermined time interval of charge relay t1, judge whether DC bus-bar voltage meets the
Two conditions, wherein the second condition is that DC bus-bar voltage is greater than predetermined voltage.In the pre- timing of closure charge relay first
Between be spaced t1 in, in the case that DC bus-bar voltage is unsatisfactory for second condition, execute step 19, that is, determine DC bus short circuit,
The information of DC bus short circuit is quoted outward；Otherwise, in closure the first predetermined time interval of charge relay t1, DC bus
In the case that voltage meets second condition, step 5 is executed.
In some embodiments of the utility model, the first predetermined time interval t1 can be equal to twice of predetermined space t.
In some embodiments of the utility model, the optional range of predetermined space t is tmin-tmax, wherein minimum value
tminDepending on time stable after the actuating of relay, maximum value tmaxIt is influenced by charging resistor fever.
In some embodiments of the utility model, the optional range of predetermined space t is 0.3-1s.
In some embodiments of the utility model, predetermined space t can be 0.5s.
In some embodiments of the utility model, the predetermined voltage can be 25V
Step 5, after being closed 2 the first predetermined time interval of predetermined time interval t1 of charge relay, judge direct current mother
Whether line voltage meets third condition, wherein the third condition is that DC bus-bar voltage is greater than predetermined direct current bus threshold value.?
After being closed 2 the first predetermined time interval of predetermined time interval t1 of charge relay, DC bus-bar voltage meets third condition
In the case of, execute step 6；Otherwise, after 12 the second predetermined time interval of the predetermined time interval t2 that are delayed, if DC bus is electric
Pressure still not satisfies third condition, thens follow the steps 20, that is, determines charge circuit failure, quotes charge circuit failure outward
Information.
In some embodiments of the utility model, the second predetermined time interval t2 can be equal to 12 times of predetermined space t.
In some embodiments of the utility model, the predetermined direct current bus threshold value can be Vph*1.414*0.8.
Step 6, it is delayed after third predetermined time interval t3, any three be closed in four relays of double relay circuit
A (such as first relay RLY1, the second relay RLY2, the second relay RLY3)；The third that is delayed again predetermined time interval t3
Afterwards, charge relay RLY_C is disconnected.
In some embodiments of the utility model, third predetermined time interval t3 can be equal to 12 times of predetermined space t.
Step 7, it is delayed after third predetermined time interval t3, judges whether the virtual value V2 of pusher side voltage meets Article 4
Part, wherein the virtual value that the fourth condition is pusher side voltage V2 is less than predetermined value.
If being delayed after the 4th predetermined time interval t4, the virtual value of pusher side voltage is still unsatisfactory for fourth condition, then executes step
Rapid 18, that is, determine relay failure, quote the message of relay failure failure outward, wherein in this case, relay loses
Imitating failure is the 4th relay RLY4 short circuit non-selected in four relays.
In some embodiments of the utility model, the 4th predetermined time interval t4 can be equal to 5 times of predetermined space t.
Otherwise, in the case where the virtual value of pusher side voltage meets fourth condition, step 8 is executed.
Step 8, it is delayed after the second predetermined time interval t2, disconnects the 4th relay RLY4 of the first relay RLY1-, closure
Charge relay RLY_C；It is delayed after the second predetermined time interval t2, the first relay RLY1 of closure, the second relay RLY2, the
Four relay RLY4, then be delayed after the second predetermined time interval t2, disconnect charge relay RLY_C.
Step 9, it is delayed after the second predetermined time interval t2, judges whether the virtual value V2 of pusher side voltage meets Article 4
Part, wherein the virtual value that the fourth condition is pusher side voltage V2 is less than predetermined value.
If being delayed after the 4th predetermined time interval t4, the virtual value of pusher side voltage is still unsatisfactory for fourth condition, then executes step
Rapid 18, that is, determine relay failure, quote the message of relay failure failure outward, wherein in this case, relay loses
Imitating failure is third relay RLY3 short circuit non-selected in four relays.
Otherwise, in the case where the virtual value of pusher side voltage meets fourth condition, step 10 is executed.
Step 10, it is delayed after the second predetermined time interval t2, disconnects the 4th relay RLY4 of the first relay RLY1-, close
Close charge relay RLY_C；Be delayed after the second predetermined time interval t2, closure the first relay RLY1, third relay RLY3,
4th relay RLY4, then be delayed after the second predetermined time interval t2, disconnect charge relay RLY_C.
Step 11, it is delayed after the second predetermined time interval t2, judges whether the virtual value V2 of pusher side voltage meets Article 4
Part, wherein the virtual value that the fourth condition is pusher side voltage V2 is less than predetermined value.
If being delayed after the 4th predetermined time interval t4, the virtual value of pusher side voltage is still unsatisfactory for fourth condition, then executes step
Rapid 18, that is, determine relay failure, quote the message of relay failure failure outward, wherein in this case, relay loses
Imitating failure is the second relay RLY2 short circuit non-selected in four relays.
Otherwise, in the case where the virtual value of pusher side voltage meets fourth condition, step 12 is executed.
Step 12, it is delayed after the second predetermined time interval t2, disconnects the 4th relay RLY4 of the first relay RLY1-, close
Close charge relay RLY_C；Be delayed after the second predetermined time interval t2, closure the second relay RLY2, third relay RLY3,
4th relay RLY4, then be delayed after the second predetermined time interval t2, disconnect charge relay RLY_C.
Step 13, it is delayed after the second predetermined time interval t2, judges whether the virtual value V2 of pusher side voltage meets Article 4
Part, wherein the virtual value that the fourth condition is pusher side voltage V2 is less than predetermined value.
If being delayed after the 4th predetermined time interval t4, the virtual value of pusher side voltage is still unsatisfactory for fourth condition, then executes step
Rapid 18, that is, determine relay failure, quote the message of relay failure failure outward, wherein in this case, relay loses
Imitating failure is the first relay RLY1 short circuit non-selected in four relays.
Otherwise, in the case where the virtual value of pusher side voltage meets fourth condition, step 14 is executed.
The utility model above-described embodiment disconnects after charge relay closure again since filter capacitor has been electrically charged, the
In the case that the 4th relay RLY4 of one relay RLY1- is not closed all, pusher side voltage V2 its actually DC quantity is (random
, the phase of alternating voltage is made according to disconnection), the value as judgement is that V2 voltage is the virtual value for subtracting this DC component.
Step 14, it is delayed after the second predetermined time interval t2, judges whether DC bus-bar voltage meets fifth condition,
In, the fifth condition is that DC bus-bar voltage continues to be greater than predetermined direct current bus threshold value (Vph*1.414*0.7).In direct current mother
In the case that line voltage is unsatisfactory for fifth condition, step 20 is executed, that is, determine charge circuit failure, quote charge circuit outward
The message of failure.Otherwise, in the case where DC bus-bar voltage meets fifth condition, step 15 is executed.
Step 15, it is closed the 4th relay RLY4 of the first relay RLY1-, is closed charge relay RLY_C.
In some embodiments of the utility model, in step 15, although enabling the 4th relay of the first relay RLY1-
RLY4 closure, charge relay disconnect；If but one of relay is opened a way, and is necessarily caused V1 to be connected to completely with V2, that is, is measured
The virtual value of the voltage of V2 is not in the normal range (virtual value that theoretically V2 voltage subtracts average value should be 0).This is practical new
Type above-described embodiment can detecte out the first relay RLY1 and the 4th relay RLY4 through the above way, and there are open failures.
Step 16, it is delayed after the second predetermined time interval t2, judges whether the virtual value of pusher side voltage meets Article 6 part,
Wherein, the Article 6 part is that the virtual value of pusher side voltage is in preset range (such as 160-280V).In pusher side voltage
In the case that virtual value meets Article 6 part, step 17 is executed；Otherwise, Article 6 part is unsatisfactory in the virtual value of pusher side voltage
In the case of, execute step 18, that is, determine relay failure, quote the message of relay failure outward.
In some embodiments of the utility model, the second relay RLY2 and the 4th relay RLY4 are from chip control
System can check the relay shape fed back from chip before whether detection V2 voltage is in preset range (such as 160-280V)
State (SPI) judges the second relay RLY2 and the 4th relay RLY4 is open and close as required, if it does not meet the requirements, then
Quote charge circuit failure.
Step 17, battery charge controller 4 determines charging control in the case where the virtual value of pusher side voltage meets Article 6 part
Task processed is completed, and quotes the message of charge control task completion outward.
Step 18, battery charge controller 4 determines relay failure, quotes the message of relay failure outward.
Step 19, battery charge controller 4 determines DC bus short circuit, quotes the fault message of DC bus short circuit outward.
Step 20, battery charge controller 4 determines charge circuit failure, quotes the information of charge circuit failure outward.
In some embodiments of the utility model, charge circuit failure is quoted by step 5 and step 14, mainly
Judgement foundation be judge whether busbar voltage reaches predetermined direct current bus threshold value (Vph*1.414*0.7) because busbar short-circuit,
The reasons such as bus load excessive, multiple relay open failures will cause charging failure.
It is excellent as long as after the actuating of relay, needing to judge voltage and state in the utility model above-described embodiment
After choosing carries out a delay t, then carry out next step operation.
Above mentioned embodiment provide the charge controls and relay failure of a kind of single-phase photovoltaic electrical equipment for the utility model
Adhesion, open circuit, the DC bus short circuit, the impact of ac filter capacitor of AC relay may be implemented in detection circuit and method
Inhibit (after charge relay closure, the capacitor charging of ac filter is realized via charging resistor current limliting).
Based on the utility model charging control circuit provided by the above embodiment, by charging back in the increase of alternating current source
Road, it is possible thereby to realize the charge control to bus capacitor.The utility model above-described embodiment will exchange side charge relay
(RLY_C) and charging resistor is connected across double relay both ends, in the case where double relay is not closed, can be charged by closure
Relay realizes the gentle charging to bus capacitor.
If the utility model above-described embodiment bus is because short circuit occurs in certain external cause, charging resistor short-circuit feelings herein
What condition persistently accessed will lead to charging resistor fever damage, it is therefore desirable to check DC bus short circuit, avoid charging resistor long
Time access.
The utility model above-described embodiment provides a kind of charging using photovoltaic electrical equipment and double relay circuit, can be real
The now adhesion of AC relay, open circuit, DC bus short circuit, the impact of ac filter capacitor inhibition and other effects.
The utility model above-described embodiment may be implemented one kind and be applied to photovoltaic electrical equipment (hair electricity integrated equipment)
Charging and relay test circuit realize requirement of the certification to the single detection of relay on this circuit base.
The utility model above-described embodiment can satisfy the relay failure testing requirements of related photovoltaic standard, avoid to filter
The impact of wave capacitor.
The charge circuit control of the utility model above-described embodiment carries out dc-link capacitance indeed through resistance
Charging, is then closed the 4th relay RLY4 of the first relay RLY1-, finally bypasses the control process of charging resistor.Wherein need
The failure of the 4th relay RLY4 of first relay RLY1- is detected.
Another aspect according to the present utility model provides a kind of photovoltaic electrical equipment, including such as above-mentioned any embodiment institute
The charging control circuit stated, and/or, including the battery charge controller 4 as described in above-mentioned any embodiment.
In some embodiments of the utility model, the photovoltaic electrical equipment can be PV air-conditioner.
Based on the utility model photovoltaic electrical equipment provided by the above embodiment, by charging back in the increase of alternating current source
Road can realize the gentle charging to bus capacitor in the case where double relay is not closed by closure charge relay.
The utility model above-described embodiment can realize adhesion, open circuit, the DC bus short circuit, ac filter of AC relay
Impact inhibition of capacitor and other effects.
The utility model above-described embodiment may be implemented one kind and be applied to photovoltaic electrical equipment (hair electricity integrated equipment)
Charging and relay test circuit realize requirement of the certification to the single detection of relay on this circuit base.
The charge circuit control of the utility model above-described embodiment carries out dc-link capacitance indeed through resistance
Charging, is then closed the 4th relay RLY4 of the first relay RLY1-, finally bypasses the control process of charging resistor.Wherein need
The failure of the 4th relay RLY4 of first relay RLY1- is detected.
Battery charge controller described above can be implemented as the general place for executing function described herein
Manage device, programmable logic controller (PLC) (PLC), digital signal processor (DSP), specific integrated circuit (ASIC), field-programmable
Gate array (FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components or
It is any appropriately combined.
So far, the utility model is described in detail.In order to avoid covering the design of the utility model, this is not described
Some details well known to field.Those skilled in the art as described above, completely it can be appreciated how implementing public here
The technical solution opened.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Description of the utility model is given for the purpose of illustration and description, and is not that exhaustively or incite somebody to action this
Utility model is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.
Embodiment was chosen and described in order to better illustrate the principle and practical application of the utility model, and makes the common skill of this field
Art personnel it will be appreciated that the utility model to designing various embodiments suitable for specific applications with various modifications.
Claims (10)
1. a kind of charging control circuit, which is characterized in that including double relay circuit, charge relay circuit, first voltage inspection
Survey device, second voltage detection device and battery charge controller, in which:
Double relay circuit is arranged between the circuit on side of overhead contact line of photovoltaic electrical equipment and pusher side circuit；First voltage detection device and
Second voltage detection device is connect with battery charge controller respectively；
Charge relay circuit, in the case where double relay circuit is not closed, closure to put down bus capacitor with realizing
Slow charging；
First voltage detection device, the net side at circuit on side of overhead contact line and double relay circuit connection for detecting photovoltaic electrical equipment
Voltage；Second voltage detection device, the machine at pusher side circuit and double relay circuit connection for detecting photovoltaic electrical equipment
Side voltage；Battery charge controller, for according to voltage on line side and pusher side voltage control charge relay circuit and double relay electricity
The on-off on road, and/or, according to voltage on line side and pusher side voltage ascertaining circuit fault type.
2. charging control circuit according to claim 1, which is characterized in that the charge relay circuit include charging after
Electric appliance and charging resistor.
3. charging control circuit according to claim 1 or 2, which is characterized in that the charge relay circuit is connected across
The both ends of double relay circuit.
4. charging control circuit according to claim 1 or 2, which is characterized in that one end of the charge relay circuit
It is connected with circuit on side of overhead contact line with the tie point of double relay circuit, the other end and DC bus of the charge relay circuit connect
It connects.
5. charging control circuit according to claim 1 or 2, which is characterized in that the double relay circuit includes first
Relay, the second relay, third relay and the 4th relay, in which:
First relay and the second relay are connected in series on zero curve；
Third relay and the 4th relay are connected in series on firewire.
6. charging control circuit according to claim 5, which is characterized in that
First relay, the second relay, third relay and the 4th relay are four individual AC relays.
7. charging control circuit according to claim 5, which is characterized in that the double relay circuit includes two groups pairs and opens
Close relay, in which:
First biswitch relay includes the first relay and third relay；
Second biswitch relay includes the second relay and the 4th relay.
8. charging control circuit according to claim 6, which is characterized in that
Battery charge controller also respectively with charge relay, the first relay, the second relay, third relay and the 4th relay
Device connection.
9. charging control circuit according to claim 8, which is characterized in that further include tertiary voltage detection device, in which:
Tertiary voltage detection device is connect with battery charge controller；
Tertiary voltage detection device, for detecting DC bus-bar voltage；Battery charge controller, for according to DC bus-bar voltage,
The on-off of voltage on line side and pusher side voltage control charge relay circuit and double relay circuit, and/or, according to DC bus electricity
Pressure, voltage on line side and pusher side voltage ascertaining circuit fault type.
10. a kind of photovoltaic electrical equipment, which is characterized in that including charge control electricity as claimed in any one of claims 1-9 wherein
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821724088.1U CN209072140U (en) | 2018-10-24 | 2018-10-24 | Photovoltaic power consumption equipment and charging control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821724088.1U CN209072140U (en) | 2018-10-24 | 2018-10-24 | Photovoltaic power consumption equipment and charging control circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209072140U true CN209072140U (en) | 2019-07-05 |
Family
ID=67095979
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821724088.1U Active CN209072140U (en) | 2018-10-24 | 2018-10-24 | Photovoltaic power consumption equipment and charging control circuit thereof |
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| Country | Link |
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| CN (1) | CN209072140U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401256A (en) * | 2019-08-27 | 2019-11-01 | 珠海格力电器股份有限公司 | Charging circuit for improving reliability, control method and photovoltaic air conditioning equipment |
| WO2020082860A1 (en) * | 2018-10-24 | 2020-04-30 | 珠海格力电器股份有限公司 | Photovoltaic electricity utilization device and charging control method, apparatus and circuit therefor, and storage medium |
-
2018
- 2018-10-24 CN CN201821724088.1U patent/CN209072140U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020082860A1 (en) * | 2018-10-24 | 2020-04-30 | 珠海格力电器股份有限公司 | Photovoltaic electricity utilization device and charging control method, apparatus and circuit therefor, and storage medium |
| US12021409B2 (en) | 2018-10-24 | 2024-06-25 | Gree Electric Appliances, Inc. Of Zhuhai | Photovoltaic electric appliance and charging control method, device and circuit thereof, and storage medium |
| CN110401256A (en) * | 2019-08-27 | 2019-11-01 | 珠海格力电器股份有限公司 | Charging circuit for improving reliability, control method and photovoltaic air conditioning equipment |
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