CN109524941A - Phase current foldback circuit and photovoltaic controller - Google Patents
Phase current foldback circuit and photovoltaic controller Download PDFInfo
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- CN109524941A CN109524941A CN201811652652.8A CN201811652652A CN109524941A CN 109524941 A CN109524941 A CN 109524941A CN 201811652652 A CN201811652652 A CN 201811652652A CN 109524941 A CN109524941 A CN 109524941A
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- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 16
- 239000003990 capacitor Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 9
- 230000036961 partial effect Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
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- 230000003321 amplification Effects 0.000 description 3
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- 238000010248 power generation Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
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- 239000005417 food ingredient Substances 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
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Abstract
The present invention provides a kind of phase current foldback circuit and photovoltaic controllers, are related to the technical field of circuit, comprising: current collection circuit, current foldback circuit and control circuit；Current collection circuit is connect with current foldback circuit, and current foldback circuit connects to the control circuit, and control circuit with equipment to be protected for connecting；Current collection circuit be used to acquire equipment to be protected phase current in circuit, and phase current is sent to current foldback circuit；Current foldback circuit exports the first low level signal, and the first low level signal is sent to control circuit for comparing whether phase current is greater than default protective current, and when comparing phase current higher than default protective current；Control circuit is when receiving the first low level signal; control control circuit is disconnected with equipment to be protected; to prevent equipment to be protected to be damaged, solves the higher technical problem of risk of equipment damage of photovoltaic controller, reached the non-damageable technical effect of protection equipment.
Description
Technical field
The present invention relates to field of circuit technology, more particularly, to a kind of phase current foldback circuit and photovoltaic controller.
Background technique
With the rapid development of new energy technology, the application of solar energy power generating is more and more wider, since photovoltaic power generation has
Have safe and reliable, noiseless, low pollution, need not consumption fuel and erecting power transmission lines many advantages, such as can generating electricity on the spot, because
This, photovoltaic power generation is increasingly valued by people.
Photovoltaic generating system is usually by photovoltaic array, battery group, photovoltaic controller, inverter, alternating current-direct current load or bavin
The equipment such as fry dried food ingredients motor composition, wherein photovoltaic controller is a kind of equipment that charge and discharge control is carried out to battery group, can be to prevent
Only overcharge of a battery or overdischarge facilitate the service life for extending battery.
But in photovoltaic charged period, the unexpected access or disconnected of the equipment such as inverter, alternating current-direct current load or diesel-driven generator
It opens, surge impact electric current can be caused to the alternate BUCK circuit of photovoltaic controller, the equipment of existing photovoltaic controller is caused to be damaged
Bad risk is higher.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of phase current foldback circuit and photovoltaic controllers, to alleviate
When surge impact electric current occurs, the higher technical problem of the risk of equipment damage of existing photovoltaic controller.
In a first aspect, the embodiment of the invention provides a kind of phase current foldback circuits, comprising: current collection circuit, overcurrent
Protect circuit and control circuit；
The current collection circuit is connect with the current foldback circuit, the current foldback circuit and the control circuit
Connection, the control circuit with equipment to be protected for connecting；
The current collection circuit is used to acquire equipment to be protected institute phase current in circuit, and the phase is electric
Stream is sent to the current foldback circuit；
Whether the current foldback circuit is greater than default protective current for the phase current, and described comparing
When phase current is higher than the default protective current, the first low level signal is exported, and first low level signal is sent to
The control circuit；
The control circuit be used for when receiving first low level signal, control the control circuit and it is described to
Protection equipment disconnects, to prevent the equipment to be protected to be damaged.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein also
It include: overpressure protection circuit；
The overpressure protection circuit is connect with the control circuit, for receiving voltage to be monitored, and it is relatively more described wait supervise
Survey whether voltage is higher than default safe voltage, when comparing the voltage to be monitored higher than default safe voltage, to the system
The second low level signal of circuit output；
The control circuit is also used to when receiving second low level signal, control the control circuit with it is described
Equipment to be protected disconnects, so that the equipment to be protected stops working.
With reference to first aspect, the embodiment of the invention provides second of possible embodiments of first aspect, wherein also
It include: latching circuit；
The latching circuit is connect with the control circuit；
The control circuit is also used in first low level signal and/or second low level signal received
When, trigger signal is generated, and the trigger signal is sent to the latching circuit；
The latching circuit is used for after receiving the trigger signal, locks the control circuit, makes the control electricity
Road remains open with the equipment to be protected connect within a preset time, avoids equipment to be protected that phase overcurrent or superpressure is occurring
In the case where, frequent start-stop.
With reference to first aspect, the embodiment of the invention provides the third possible embodiments of first aspect, wherein institute
Stating current collection circuit includes power resistor RS1, operational amplifier U2A and triode Q1；
The power resistor RS1 connects with the equipment to be protected, for circuit where acquiring the equipment to be protected
Phase current, and the phase current is converted into corresponding voltage signal；
The non-inverting input terminal of the operational amplifier U2A connects one end of the power resistor RS1, the operational amplifier
The inverting input terminal of U2A connects the other end of the power resistor RS1, described in the output end connection of the operational amplifier U2A
The base stage of triode Q1；
The base stage of the triode Q1 is connect with the output end for calculating amplifier U2A, emitter and the operation amplifier
The inverting input terminal of device U2A connects, and collector is connect with the current foldback circuit.
With reference to first aspect, the embodiment of the invention provides the 4th kind of possible embodiments of first aspect, wherein institute
Stating current foldback circuit includes first comparator U1D；
The inverting input terminal of the first comparator U1D connects the collector of the triode Q1, non-inverting input terminal access
Default protective current, output end connect the control circuit；
Whether the first comparator U1D is higher than default protective current for the phase current, and judging
When stating phase current higher than the default protective current, Xiang Suoshu control circuit exports the first low level signal.
With reference to first aspect, the embodiment of the invention provides the 5th kind of possible embodiments of first aspect, wherein institute
Stating control circuit includes: the second comparator U1A；
The inverting input terminal of the second comparator U1A is connect with the output end of the first comparator U1D, homophase input
It terminates into the first predetermined reference voltage, output end is connect with the equipment to be protected；
When whether the second comparator U1A is higher than the first predetermined reference voltage for the phase current, and sentencing
It is disconnected go out it is described export trigger signal when being higher than the first predetermined reference voltage, and control the control circuit and to be protected set with described
It is standby to disconnect, so that the equipment to be protected is stopped working.
With reference to first aspect, the embodiment of the invention provides the 6th kind of possible embodiments of first aspect, wherein institute
Stating overpressure protection circuit includes receiving end and third comparator U1C；
Described receiving end one end connects voltage side to be monitored and receives voltage to be monitored, and the other end connects the third comparator
The inverting input terminal of U1C；
The inverting input terminal of the third comparator U1C is connect with the receiving end, and non-inverting input terminal is default for accessing
Safe voltage, output end are connect with the control circuit；
Whether the third comparator U1C is higher than preset protection voltage for the voltage to be monitored, and than
When the voltage signal is higher than the default safe voltage more out, Xiang Suoshu control circuit exports the second low level signal.
With reference to first aspect, the embodiment of the invention provides the 7th kind of possible embodiments of first aspect, wherein institute
Stating latching circuit includes the 4th comparator U1B and single-chip microcontroller；
The single-chip microcontroller is connect with the inverting input terminal of the control circuit and the 4th comparator U1B respectively, is used for
The trigger signal is received, and when receiving the trigger signal, the 4th comparator U1B of Xiang Suoshu exports enable signal；
The inverting input terminal of the 4th comparator U1B is connect with the single-chip microcontroller, and non-inverting input terminal access second is default
Reference voltage, output end are connect with the control circuit, for when receiving the enable signal, locking the control electricity
Road remains open the control circuit in the first preset time with the equipment to be protected and connect.
With reference to first aspect, the embodiment of the invention provides the 8th kind of possible embodiments of first aspect, wherein institute
It states single-chip microcontroller to be also used to after the first preset time of output enable signal, exports unlocking signal, and the unlocking signal is sent out
The control circuit is given, to release the locking to the control circuit.
Second aspect, the embodiment of the present invention also provide a kind of photovoltaic controller, comprising: include such as in the photovoltaic controller
Any phase current foldback circuit of first aspect.
The embodiment of the present invention brings following the utility model has the advantages that current collection circuit can be set acquires equipment to be protected in real time
Whether the phase current of place circuit, setting current foldback circuit are higher than default protective current for more collected phase current,
Setting control circuit controls equipment to be protected from place when current foldback circuit compares phase current and is higher than default protective current
Circuit Interrupt opens connection, and equipment to be protected is prevented to be damaged because of phase overcurrent.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, claims
And specifically noted structure is achieved and obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the first composition schematic diagram of phase current foldback circuit provided in an embodiment of the present invention；
Fig. 2 is second of composition schematic diagram of phase current foldback circuit provided in an embodiment of the present invention；
Fig. 3 is the third composition schematic diagram of phase current foldback circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of circuit diagram of phase current foldback circuit provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Currently, with the rapid development of new energy technology, the application of solar energy power generating is more and more wider, since photovoltaic is sent out
Electricity have safe and reliable, noiseless, low pollution, need not consumption fuel and erecting power transmission lines can generate electricity on the spot etc. it is many excellent
Point, therefore, photovoltaic power generation is increasingly valued by people.
Photovoltaic generating system is usually by photovoltaic array, battery group, photovoltaic controller, inverter, alternating current-direct current load or bavin
The equipment such as fry dried food ingredients motor composition, wherein photovoltaic controller is a kind of equipment that charge and discharge control is carried out to battery group, can be to prevent
Only overcharge of a battery or overdischarge facilitate the service life for extending battery.
But in photovoltaic charged period, the unexpected access or disconnected of the equipment such as inverter, alternating current-direct current load or diesel-driven generator
It opens, surge impact electric current can be caused to the alternate BUCK circuit of photovoltaic controller, the equipment of existing photovoltaic controller is caused to be damaged
Bad risk is higher, is based on this, a kind of phase current foldback circuit and photovoltaic controller provided in an embodiment of the present invention, can prevent to
Equipment occurrence of equipment due to phase overcurrent is protected to damage.
For convenient for understanding the present embodiment, first to a kind of phase current foldback circuit disclosed in the embodiment of the present invention
2 describe in detail, as shown in Figure 1, phase current foldback circuit 2 may include: current collection circuit 1,2 and of current foldback circuit
Control circuit 3；
Current collection circuit 1 is connect with current foldback circuit 2, and current foldback circuit 2 is connect with control circuit 3, control electricity
Road 3 with equipment to be protected 4 for connecting；
Current collection circuit 1 be used to acquire equipment to be protected 4 phase current in circuit, and phase current was sent to
Stream protection circuit 2；
Current foldback circuit 2 is higher than for comparing whether phase current is greater than default protective current comparing phase current
When default protective current, the first low level signal is exported, and the first low level signal is sent to control circuit 3；
Control circuit 3 is used for when receiving the first low level signal, and control equipment to be protected 4 is opened from place Circuit Interrupt
Connection, to prevent equipment to be protected 4 to be damaged.
The embodiment of the present invention can acquire the phase of 4 place circuit of equipment to be protected by setting current sampling circuit in real time
Whether electric current, the phase current that can compare current sampling circuit acquisition in real time by the way that current foldback circuit is arranged are higher than default protection
Electric current, this is because equipment to be protected 4 is easy to be burnt out by excessively high electric current, institute if phase current is higher than preset protective current
With by current foldback circuit, can when comparing phase current and being higher than default protective current, export the first low level signal to
Control circuit, control circuit can control equipment to be protected 4 from the circuit at place after the first low level signal received
It disconnects, through the embodiment of the present invention, can be very good to solve when surge occurs for 4 place circuit of equipment to be protected, cause
The higher technical problem of 4 damage risk of equipment to be protected, the damage risk of equipment to be protected 4 can be reduced.
In actual operation, the reason of causing surge other than phase current increases suddenly, due to it is abnormal operation or
Other abnormal causes, it is also possible to it will appear overpressure, and superpressure can also cause surge, equally cause to hold to equipment to be protected 4
Risk easy to damage is based on this, as shown in Fig. 2, phase current foldback circuit 2 can also include overpressure protection circuit 5；
Overpressure protection circuit 5 can be connect with control circuit 3, for receiving voltage to be monitored, and voltage more to be monitored
Whether default safe voltage is higher than, it is low to circuit output second processed when comparing voltage to be monitored higher than default safe voltage
Level signal；
Control circuit 3 is also used to when receiving the second low level signal, and control control circuit 3 and equipment to be protected 4 are disconnected
Connection is opened, so that equipment to be protected 4 stops working.
Through the embodiment of the present invention, default protection voltage whether can be higher than by voltage more to be monitored in real time, this is because
Equipment to be protected 4 is easy to pass through setting superpressure because overtension is burned out in the case where being higher than default protection voltage
Protection circuit can export the second low level control signal when comparing voltage to be monitored higher than default protection voltage, so that
When receiving the second low level signal, control control circuit 3 disconnects control circuit with equipment to be protected 4, so as to
Equipment to be protected 4 is set to stop working, the effective solution equipment as caused by overpressure problem easy to damage.
In addition, surge phenomenon may continue for some time after surge occurs, during surge, phase current is fluctuated,
Alternatively, in voltage instability to be monitored timing, it is also possible to there is phenomenon fluctuated, therefore, phase current fluctuated or
Person's voltage to be monitored, the frequent on-off for being likely to result in control circuit are based on so as to cause the frequent start-stop of equipment to be protected 4
This, as shown in figure 3, phase current foldback circuit 2 provided in an embodiment of the present invention can also include latching circuit 6；
Latching circuit 6 is connect with control circuit 3；
The first low level signal and/or the second low level signal that control circuit 3 is also used to receive are sent to self-locking
Circuit 6；
Latching circuit 6 is used for the lock control circuit after receiving the first low level signal and/or the second low level signal
3, it remains open control circuit 3 with equipment to be protected 4 within a preset time and connect, avoid equipment to be protected 4 that mutually mistake is occurring
In the case where stream or superpressure, frequent start-stop.
The embodiment of the present invention can receive the first low level signal and/or second low by setting latching circuit 6
When level signal, lock control circuit 3 makes control circuit 3 within a preset time, is always maintained at and disconnects company with protection equipment
It connects, after surge or electric voltage exception to be monitored releases, and through the embodiment of the present invention, can effectively avoid because of phase current
Or voltage to be monitored it is fluctuated caused by 4 frequent start-stop of equipment to be protected the phenomenon that, obtain equipment to be protected 4 effectively
Protection.
Specifically, the circuit diagram of current collection circuit 1 can as shown in connection with fig. 4, current collection circuit 1 includes power electricity
Hinder RS1, operational amplifier U2A and triode Q1；
One end of the non-inverting input terminal connection power resistor RS1 of operational amplifier U2A, the reverse phase of operational amplifier U2A are defeated
Enter the other end of end connection power resistor RS1, the base stage of the output end connecting triode Q1 of operational amplifier U2A；
The base stage of triode Q1 is connect with the output end for calculating amplifier U2A, and the reverse phase of emitter and operational amplifier U2A is defeated
Enter end connection, collector is connect with current foldback circuit.
As an example, in conjunction with Fig. 4, current sampling circuit 1 can also include: first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first capacitor C1, the second capacitor C2, wherein first resistor R1 is arrived
The effect of 5th resistance R5 is partial pressure, and the effect of first capacitor C1 to the second capacitor C2 are filtering.
Wherein, as shown in connection with fig. 4, first resistor R1 is connected between 2 feet of operational amplifier U2A and power resistor RS1,
Second resistance R2 is connected between 3 feet of operational amplifier U2A and power resistor RS1；One end connection first of 3rd resistor R3
The cathode of reference voltage, illustratively, the first reference voltage can be BAT-5V, and the other end connection operation of 3rd resistor R3 is put
3 feet of big device U2A；One end of 4th resistance R4 is connect with the collector of triode Q1, the other end and the 5th resistance R5 series connection
After be grounded.
1 foot of one end connection operational amplifier of first capacitor C1, the other end connecting triode Q1's of first capacitor C1
Emitter；2 feet of one end connection operational amplifier U2A of second capacitor C2, the other end of the second capacitor C2 connect operation amplifier
3 feet of device U2A.
In practical applications, in order to reduce power consumption, the resistance value of power resistor RS1 is usually a few milliohms, therefore, phase current warp
It is often smaller that power resistor RS1 converts corresponding voltage, therefore, generally require by the voltage signal by operational amplifier into
Row enhanced processing, is described below the working principle of operational amplifier U2A, and 2 feet of operational amplifier U2A connect power resistor RS1
One end, then after collected phase current is converted to corresponding voltage signal by power resistor RS1, which is flowed into
The inverting input terminal of operational amplifier U2A, when 3 feet of the voltage values and operational amplifier U2A of 2 feet of operational amplifier U2A
When voltage value balances, the output end of operational amplifier U2A can produce 2 feet of 1 foot and triode Q1 that are supplied to triode Q1
One bias current.
The working principle of triode Q1 are as follows: as shown in connection with fig. 4, inputted when the output end for receiving operational amplifier U2A
When bias current, 2 feet of triode Q1 are connected to 1 foot of triode Q1, base current Ib are generated, at this point, 2 feet of triode Q1
It is in amplification region with 1 foot of triode Q1, generates the output electric current of β * Ib, β is the amplification coefficient of triode here.
In conjunction with Fig. 4, the phase current that current sampling circuit can acquire power resistor RS1 is converted to input operational amplifier
The voltage signal of the inverting input terminal of U2A, then will be after voltage signal amplification by operational amplifier U2A and triode Q1
It exports to current foldback circuit 2.
Specifically, the circuit diagram of current foldback circuit 2 can be as shown in figure 4, current foldback circuit 2 compares including first
Device U1D；
The collector of the inverting input terminal connecting triode Q1 of first comparator U1D, the default protection of non-inverting input terminal access
Electric current, output end connect control circuit 3；
Whether first comparator U1D is higher than default protective current for comparing phase current, and is judging that phase current is higher than
When default protective current, the first low level signal is exported to control circuit 3.
As an example, in conjunction with shown in Fig. 4, current foldback circuit 2 can also include: the 6th resistance R6, the 7th electricity
Hinder R7, the 8th resistance R8, third capacitor C3；Wherein the effect of the 6th resistance R6 is current limliting, the 7th resistance R7 to the 8th resistance R8
Effect be partial pressure effect, the effect of third capacitor C3 is filter action.
Wherein, the 6th resistance R6 is connected between first comparator U1D and the collector of triode Q1, the 7th resistance R7's
One end connects the anode of the second reference voltage, and illustratively, the second reference voltage is 3.3V, and the other end connects first comparator
The inverting input terminal of U1D；One end of 8th resistance R8 is grounded, and the other end connects the inverting input terminal of first comparator U1D；Third
One end of capacitor C3 is grounded, and the other end connects the inverting input terminal of first comparator U1D.
In conjunction with Fig. 4, the course of work of current foldback circuit 2 are as follows:
The input terminal of current foldback circuit 2 receives the output signal IBAT1 of current sampling circuit, connects by the 6th resistance R6
Enter the inverting input terminal of first comparator U1D, the second reference voltage of 3.3V is divided by the 7th resistance R7 and the 8th resistance R8
Afterwards, the normal phase input end for accessing first comparator U1D, works as phase current, in conjunction in Fig. 4, it is to work as IC1 that phase current, which can mark,
After current sampling circuit exports, if it is greater than the positive input terminal of comparator U1D reference voltage when, first comparator U1D
Output end exports the first low level signal, here, in conjunction with Fig. 4, by current foldback circuit 2, overpressure protection circuit 5, control circuit 3
Be named as the end FAULT-SD with the public access end of latching circuit 6, wherein the end FAULT-SD can respectively with current foldback circuit
The output end of 2 first comparator U1D connects, and connect with the output end of the third comparator U1C of overpressure protection circuit 5, with control
The inverting input terminal of second comparator U1A of circuit 3 processed connects；In conjunction with Fig. 4, the first low level signal can be by FAULT-
The FAULT-SD signal at the end SD is set low, and illustratively, the FAULT-SD signal at the end FAULT-SD is normally to set height, is supplied to certainly
Otherwise 3 one low level trigger signals of lock circuit 6 and control circuit normally set height, normally can be 12V illustratively.
FAULT-SD signal is normally set to high level, protects in the first low level signal and superpressure for receiving the output of current foldback circuit 2
After the second low level signal that protection circuit 5 exports, FAULT-SD signal is set low.
Specifically, the circuit diagram of control circuit 3 can be as shown in figure 4, control circuit 3 includes: the second comparator U1A；
The inverting input terminal of second comparator U1A is connect with the output end of first comparator U1D, non-inverting input terminal access the
One predetermined reference voltage, output end are connect with equipment to be protected；
When whether the second comparator U1A is higher than the first predetermined reference voltage for comparing phase current, and judging to be higher than
When the first predetermined reference voltage, trigger signal is exported, and controls control circuit and equipment to be protected disconnection, stops equipment to be protected
Only work.
As an example, as shown in connection with fig. 4, the positive that 3 feet of the second comparator U1A are the second comparator U1A inputs
End, for accessing the anode of the second reference voltage, i.e.+3.3V, 2 feet of the second comparator U1A are the reverse phase of the second comparator U1A
Input terminal；4 feet of second comparator U1A are grounded, and 11 feet of the second comparator U1A connect the anode of third reference voltage, exemplary
, third reference voltage can be 12V.
In conjunction with Fig. 4, control circuit 3 can also include the 9th resistance R9, the tenth resistance R10, the 4th capacitor C4 and the one or two
Pole pipe D1；Wherein the effect of the 9th resistance R9 is output signal pull-up, and the effect of the tenth resistance R10 is current limliting, the 4th capacitor C4
Effect be filtering, the effect of first diode is to drag down the voltage at the end capacitor C4 after conducting.
Wherein, the 9th one end resistance R9 connects the anode of the first reference voltage, i.e.+3.3V, and other end connection second is compared
The output end of device U1A；The anode of one end connection third reference voltage of tenth resistance R10, i.e. 12V, the second ratio of other end connection
Compared with the negative input end of device U1A；One end of 4th capacitor C4 connects the negative input end of the second comparator U1A, and the 4th capacitor C4's is another
One end connects 4 feet of the second comparator U1A；The anode of first diode is connect with the inverting input terminal of the second comparator U1A.
In conjunction with Fig. 4, the course of work of control circuit 3 are as follows:
Under normal circumstances, FAULT-SD signal is normally set to height, is illustratively third reference voltage 12V, then,
The inverting input terminal of second comparator U1A accesses third reference voltage 12V by the tenth resistance R10, just higher than comparator U1A
The CHG-CLOSE signal of first reference voltage 3.3V, the second comparator U1A output of phase input terminal access is low level.
The exported in the first low level signal and/or overpressure protection circuit 5 for receiving the output of current foldback circuit 2
When two low level signals, FAULT-SD signal is set low, and the inverting input terminal of the second comparator U1A passes through diode D2 quilt
FAULT-SD signal is set low, and the second comparator U1A normal phase input end accesses the second reference voltage 3.3V, at this point, the second comparator
U1A output end output CHG-CLOSE signal be 3.3V high level, therefore 3 output end of control circuit disconnect, thus control to
Equipment 4 is protected to open connection from place Circuit Interrupt, to prevent equipment to be protected 4 to be damaged.
Specifically, the circuit diagram of overpressure protection circuit 5 can with as shown in figure 4, overpressure protection circuit 5 include receiving end and
Third comparator U1C；
Receiving end one end connects voltage side to be monitored and receives voltage to be monitored, and the other end connects the anti-of third comparator U1C
Phase input terminal；
The inverting input terminal of third comparator U1C is connect with receiving end, and non-inverting input terminal is used to access default safe voltage,
Output end connects to the control circuit；
Whether third comparator U1C is higher than preset protection voltage for voltage more to be monitored, and is comparing voltage
When signal is higher than default safe voltage, the second low level signal is exported to control circuit.
As an example, in conjunction with shown in Fig. 4, overpressure protection circuit 5 can also include eleventh resistor R11, the tenth
Two resistance R12 and the 5th capacitor C5；Wherein the effect of eleventh resistor R11 and twelfth resistor R12 are partial pressure, the 5th capacitor C5
Effect be filtering.
In embodiments of the present invention, one end of eleventh resistor R11 is connect with receiving end, and eleventh resistor R11's is another
End is connect with the inverting input terminal of third comparator U1C, then flowing into after voltage to be monitored can be via eleventh resistor R11
The inverting input terminal of third comparator U1C；One end of twelfth resistor R12 is grounded, and the other end connects the anti-of third comparator U1C
Phase input terminal；5th capacitor C5 is in parallel with twelfth resistor R12.
In conjunction with Fig. 4, the course of work of overpressure protection circuit 5 are as follows:
When voltage PV2 to be monitored accesses third comparator after eleventh resistor R11 and twelfth resistor R12 partial pressure
The normal phase input end of the inverting input terminal of U1C, third comparator U1C accesses the second reference voltage 3.3V, as voltage PV2 to be monitored
When more than default safe voltage, the voltage of the inverting input terminal of third comparator U1C is defeated greater than the positive of third comparator U1C
Enter the second reference voltage 3.3V at end, third comparator U1C output end exports the second low level signal, by FAULT-SD signal
It sets low.
Specifically, the circuit diagram of latching circuit 6 is as shown in figure 4, latching circuit 6 includes the 4th comparator U1B and single-chip microcontroller；
The input terminal of single-chip microcontroller is connect with the output end of the second comparator U1A in control circuit 3, the output end of single-chip microcontroller
It is connected with the inverting input terminal of the 4th comparator U1B, for receiving trigger signal, and when receiving trigger signal, to the 4th
Comparator U1B exports enable signal；
The inverting input terminal of 4th comparator U1B is connect with single-chip microcontroller, and non-inverting input terminal accesses the second predetermined reference voltage,
Output end is connect with control circuit 3, for when receiving enable signal, lock control circuit 3 to make control circuit 3 first
It remains open and connect with equipment to be protected 4 in preset time.
As an example, in conjunction with shown in Fig. 4, latching circuit 6 can also include: thirteenth resistor R13, the 14th electricity
Hinder R14, the 15th resistance R15 and the second diode D2；Wherein the effect of thirteenth resistor R13 and the 15th resistance R15 are point
Pressure, the effect of the 14th resistance R14 is current limliting, and the effect of the second diode D2 is to form the 4th after receiving trigger signal to compare
Conducting circuit of the non-inverting input terminal of device U1B to GND.
Further, the anode of one end connection third reference voltage of thirteenth resistor R13, i.e.+12V, thirteenth resistor
The other end of R13 connects the normal phase input end of the 4th comparator U1B；One end connection single-chip microcontroller of 14th resistance R14, the tenth
The other end of four resistance R14 connects the inverting input terminal of the 4th comparator U1B；The 4th ratio of one end connection of 15th resistance R15
Compared with the normal phase input end of device U1B, the other end of the 15th resistance R15 connects the anode of the second diode D2, the second diode D2
Cathode connect the 4th comparator U1B output end.
In conjunction with shown in Fig. 4, the course of work of latching circuit 6 are as follows:
Latching circuit 6 can export the holding and solution that enable signal completes FAULT-SD signal low and high level by single-chip microcontroller
It removes, enable signal can be denoted as to CHG-EN signal here, under normal circumstances, CHG-EN signal sets height, illustratively, is set to
Second reference voltage+3.3V, when phase overcurrent and/or superpressure occurs, current foldback circuit 2 and/or overpressure protection circuit 5 will
FAULT-SD signal is set low, and the voltage+12V of the common end FAULT-SD passes through the 15th resistance R15, thirteenth resistor R13 at this time
After the second diode D2 series connection partial pressure, the normal phase input end of the 4th comparator U1B is accessed, it is anti-less than the 4th comparator U1B
The output end of the+3.3V of the CHG-EN signal of phase input terminal access, the 4th comparator U1B export low level, complete to FAULT-
The low level holding of SD signal, control circuit 3 disconnect within a preset time.
In embodiments of the present invention, single-chip microcontroller is also used to after the first preset time of output enable signal, output unlock
Signal, and unlocking signal is sent to control circuit 3, to release the locking to control circuit 3.
In embodiments of the present invention, after the surge phenomenon caused by phase overcurrent or superpressure disappears, single-chip microcontroller can also be
The locking to control circuit 3 is released in second preset time, works normally control circuit 3.
Illustratively, single-chip microcontroller can also set low CHG-EN signal, at this time the inverting input terminal of the 4th comparator U1B
Voltage is less than by accessing the 4th comparator U1B's after the 15th resistance R15, thirteenth resistor R13 and the second diode D2 partial pressure
The output end of the voltage of normal phase input end, the 4th comparator U1B exports high level, releases to the low level guarantor of FAULT-SD signal
It holds.
In another embodiment of the present invention, a kind of photovoltaic controller is also provided, comprising: include as above in photovoltaic controller
State any phase current foldback circuit 2 of embodiment.
Illustratively, in photovoltaic generating system, photovoltaic array is battery charging by photovoltaic controller, is charged the phase
Between, when phase overcurrent or superpressure occurs, photovoltaic controller can disconnect the connection with photovoltaic array, stop filling to battery
Electricity avoids being damaged.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustratively, without
It is as limitation, therefore, 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, does not then need that it is further defined and explained in subsequent attached drawing.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally, it should be noted that above embodiments, only a specific embodiment of the invention, to illustrate skill of the invention
Art scheme, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to the present invention into
Go detailed description, those skilled in the art should understand that: anyone skilled in the art is at this
It invents in the technical scope disclosed, can still modify or can be thought easily to technical solution documented by previous embodiment
To variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make corresponding
The essence of technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection scope of the present invention
Within.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of phase current foldback circuit characterized by comprising current collection circuit, current foldback circuit and control circuit；
The current collection circuit is connect with the current foldback circuit, and the current foldback circuit and the control circuit connect
It connects, the control circuit with equipment to be protected for connecting；
The current collection circuit be used to acquire the equipment to be protected phase current in circuit, and the phase current is sent out
Give the current foldback circuit；
Whether the current foldback circuit is greater than default protective current for the phase current, and is comparing the phase electricity
When stream is higher than the default protective current, the first low level signal is exported, and first low level signal is sent to described
Control circuit；
The control circuit be used for when receiving first low level signal, control the control circuit with it is described to be protected
Equipment disconnects, to prevent the equipment to be protected to be damaged.
2. phase current foldback circuit according to claim 1, which is characterized in that further include: overpressure protection circuit；
The overpressure protection circuit is connect with the control circuit, for receiving voltage to be monitored, and the electricity to be monitored
Whether pressure is higher than default safe voltage, when comparing the voltage to be monitored higher than default safe voltage, to the control electricity
Road exports the second low level signal；
The control circuit is also used to when receiving second low level signal, controls the control circuit with described wait protect
Shield equipment disconnects, so that the equipment to be protected stops working.
3. phase current foldback circuit according to claim 1 or 2, which is characterized in that further include: latching circuit；
The latching circuit is connect with the control circuit；
The control circuit is also used in first low level signal received and/or second low level signal,
Trigger signal is generated, and the trigger signal is sent to the latching circuit；
The latching circuit is used for after receiving the trigger signal, locks the control circuit, the control circuit is made to exist
It remains open and connect with the equipment to be protected in preset time, avoid equipment to be protected in the feelings that phase overcurrent or superpressure occurs
Under condition, frequent start-stop.
4. phase current foldback circuit according to claim 1, which is characterized in that the current collection circuit includes power electricity
Hinder RS1, operational amplifier U2A and triode Q1；
The power resistor RS1 connects with the equipment to be protected, the phase electricity for circuit where acquiring the equipment to be protected
Stream, and the phase current is converted into corresponding voltage signal；
The non-inverting input terminal of the operational amplifier U2A connects one end of the power resistor RS1, the operational amplifier U2A
Inverting input terminal connect the other end of the power resistor RS1, the output end of the operational amplifier U2A connects three pole
The base stage of pipe Q1；
The base stage of the triode Q1 is connect with the output end for calculating amplifier U2A, emitter and the operational amplifier U2A
Inverting input terminal connection, collector connect with the current foldback circuit.
5. phase current foldback circuit according to claim 1, which is characterized in that the current foldback circuit includes the first ratio
Compared with device U1D；
The inverting input terminal of the first comparator U1D connects the collector of the triode Q1, and non-inverting input terminal access is default
Protective current, output end connect the control circuit；
Whether the first comparator U1D is higher than default protective current for the phase current, and is judging the phase
When electric current is higher than the default protective current, Xiang Suoshu control circuit exports the first low level signal.
6. phase current foldback circuit according to claim 1, which is characterized in that the control circuit includes: second to compare
Device U1A；
The inverting input terminal of the second comparator U1A is connect with the output end of the first comparator U1D, homophase input termination
Enter the first predetermined reference voltage, output end is connect with the equipment to be protected；
When whether the second comparator U1A is higher than the first predetermined reference voltage for the phase current, and judging
It is described to export trigger signal when being higher than the first predetermined reference voltage, and control the control circuit and the equipment to be protected is disconnected
It opens, the equipment to be protected is made to stop working.
7. phase current foldback circuit according to claim 2, which is characterized in that the overpressure protection circuit includes receiving end
With third comparator U1C；
Described receiving end one end connects voltage side to be monitored and receives voltage to be monitored, and the other end connects the third comparator U1C
Inverting input terminal；
The inverting input terminal of the third comparator U1C is connect with the receiving end, and non-inverting input terminal is for accessing default safety
Voltage, output end are connect with the control circuit；
Whether the third comparator U1C is higher than preset protection voltage for the voltage to be monitored, and is comparing
When the voltage signal is higher than the default safe voltage, Xiang Suoshu control circuit exports the second low level signal.
8. phase current foldback circuit according to claim 1, which is characterized in that the latching circuit includes the 4th comparator
U1B and single-chip microcontroller；
The single-chip microcontroller is connect with the inverting input terminal of the control circuit and the 4th comparator U1B respectively, for receiving
The trigger signal, and when receiving the trigger signal, the 4th comparator U1B of Xiang Suoshu exports enable signal；
The inverting input terminal of the 4th comparator U1B is connect with the single-chip microcontroller, and non-inverting input terminal accesses the second preset reference
Voltage, output end are connect with the control circuit, for when receiving the enable signal, locking the control circuit, are made
The control circuit is remained open with the equipment to be protected in the first preset time and is connect.
9. phase current foldback circuit according to claim 8, which is characterized in that the single-chip microcontroller is also used to enabled in output
After first preset time of signal, unlocking signal is exported, and the unlocking signal is sent to the control circuit, with releasing pair
The locking of the control circuit.
10. a kind of photovoltaic controller characterized by comprising include such as any institute of claim 1-9 in the photovoltaic controller
The phase current foldback circuit stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811652652.8A CN109524941B (en) | 2018-12-29 | 2018-12-29 | Phase overcurrent protection circuit and photovoltaic controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811652652.8A CN109524941B (en) | 2018-12-29 | 2018-12-29 | Phase overcurrent protection circuit and photovoltaic controller |
Publications (2)
| Publication Number | Publication Date |
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| CN109524941A true CN109524941A (en) | 2019-03-26 |
| CN109524941B CN109524941B (en) | 2024-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811652652.8A Active CN109524941B (en) | 2018-12-29 | 2018-12-29 | Phase overcurrent protection circuit and photovoltaic controller |
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| CN (1) | CN109524941B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112134269A (en) * | 2020-09-28 | 2020-12-25 | 江苏雷利电机股份有限公司 | Protection circuit, circuit protection device and motor control system |
| CN112134262A (en) * | 2020-09-28 | 2020-12-25 | 江苏雷利电机股份有限公司 | Protection circuit and circuit protection method for power device |
| CN113595372A (en) * | 2021-07-28 | 2021-11-02 | 阳光电源股份有限公司 | Protection circuit, application device thereof and circuit protection method |
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| EP3221943A1 (en) * | 2014-11-18 | 2017-09-27 | Robert Bosch GmbH | Protective circuit for overvoltage and/or overcurrent protection |
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| CN112134269A (en) * | 2020-09-28 | 2020-12-25 | 江苏雷利电机股份有限公司 | Protection circuit, circuit protection device and motor control system |
| CN112134262A (en) * | 2020-09-28 | 2020-12-25 | 江苏雷利电机股份有限公司 | Protection circuit and circuit protection method for power device |
| CN112134269B (en) * | 2020-09-28 | 2022-09-02 | 江苏雷利电机股份有限公司 | Protection circuit, circuit protection device and motor control system |
| CN112134262B (en) * | 2020-09-28 | 2022-09-02 | 江苏雷利电机股份有限公司 | Protection circuit and circuit protection method for power device |
| CN113595372A (en) * | 2021-07-28 | 2021-11-02 | 阳光电源股份有限公司 | Protection circuit, application device thereof and circuit protection method |
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| Publication number | Publication date |
|---|---|
| CN109524941B (en) | 2024-06-28 |
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