CN103545804B - Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment - Google Patents
Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment Download PDFInfo
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- CN103545804B CN103545804B CN201310312311.7A CN201310312311A CN103545804B CN 103545804 B CN103545804 B CN 103545804B CN 201310312311 A CN201310312311 A CN 201310312311A CN 103545804 B CN103545804 B CN 103545804B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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Abstract
The invention provides a direct-current input end inverted connection protecting circuit. The direct-current input end inverted connection protecting circuit comprises a controllable disconnection accessory, a voltage detecting unit and a control unit, wherein the controllable disconnection accessory is connected between a direct-current input end and a rear-stage circuit; the voltage detecting unit is connected between a positive pole and a negative pole of the direct-current input end in parallel, and is used for detecting voltage signals between the positive pole and the negative pole of the direct-current input end and transmitting a detection result to the control unit; and the control unit is respectively connected with the voltage detecting unit and the controllable disconnection accessory, is used for judging whether the positive pole and the negative pole of the direct-current input end are in inverted connection or not according to the detection result of the voltage detecting unit, controls the controllable disconnection accessory to perform disconnection if the positive pole and the negative pole of the direct-current input end are in inverted connection, and controls the controllable disconnection accessory to perform connection if the positive pole and the negative pole of the direct-current input end are connected with each other correctly. Correspondingly, the invention provides direct-current input equipment and a direct-current input end inverted connection protecting method. Compared with the prior art, the direct-current input end inverted connection protecting circuit has the advantages that the cost can be reduced, and the power consumption of a system can also be reduced.
Description
Technical field
The present invention relates to direct-flow input end anti-reverse resist technology field is and in particular to one kind
Direct-flow input end reverse connection prevention protection circuit and method, direct current input equipment.
Background technology
In grid-connected photovoltaic system, the direct-flow input end of inverter is directly and solar energy
The output end of cell panel is connected, and when the direct-flow input end reversal connection of inverter, its direct current is defeated
Enter end to be short-circuited by the switching tube short circuit in inverter, switching tube can be damaged,
Even there is fire, so to the reverse connecting protection of its direct-flow input end in phase in inverter
All require in the standard of pass.
In order to prevent inverter direct-flow input end reversal connection, as shown in figure 1, prior art one
As can its direct-flow input end arrange diode, with the unilateal conduction performance using diode
To protect inverter (i.e. late-class circuit).But diode is in inverter course of normal operation
Middle can constant conduction and interior for a long time have electric current to pass through, thus resulted in continued depletion, from
Secure context considers, the type selecting to diode and radiating suffer from higher requirement, cost
Higher.As can be seen that on the one hand the above-mentioned scheme arranging diode in direct-flow input end increases
Add larger cost, on the other hand can increase system power dissipation when inverter normally runs,
Reduce system effectiveness.
Content of the invention
The technical problem to be solved be for prior art in the presence of above-mentioned
Defect, provide one kind can reduces cost, the direct-flow input end of system power dissipation can be reduced again
Reverse connection prevention protection circuit and method, direct current input equipment.
Solve the technical scheme that present invention problem is adopted：
Described controlled disconnection annex is connected between direct-flow input end and late-class circuit；
Described voltage detection unit is connected in parallel between direct-flow input end both positive and negative polarity, for real-time
Voltage signal between detection direct-flow input end both positive and negative polarity, and testing result is sent to control
Unit processed；
Described control unit is connected with voltage detection unit and controlled disconnection annex respectively, uses
Judge whether direct-flow input end both positive and negative polarity is anti-in the testing result according to voltage detection unit
Connect, if it is determined that reversal connection, then controlling controlled disconnection annex to disconnect, if it is determined that just connecing, then controlling
Make controlled disconnection annex adhesive.
Preferably, described control unit specifically for：
After electricity on direct-flow input end reverse connection prevention protection circuit,
If the testing result of described voltage detection unit is between direct-flow input end both positive and negative polarity
Voltage is negative pressure, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled disconnection attached
Part disconnects；
If the testing result of described voltage detection unit is between direct-flow input end both positive and negative polarity
Voltage is malleation, then judge that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection attached
Part adhesive.
Preferably, it is preset with negative pressure normal value in described control unit, be additionally operable in voltage
The testing result of detector unit is voltage between direct-flow input end both positive and negative polarity when being negative pressure,
Obtain this negative pressure value, judge whether described negative pressure value has more than described negative pressure normal value
0～50%, in this way, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled disconnection
Annex disconnects, such as no, then judge that direct-flow input end both positive and negative polarity just connects, and controls controlled disconnected
Open annex adhesive.
Preferably, described control unit is additionally operable to：In direct-flow input end anti-reverse protection electricity
Before Lu Shang electricity, controlled disconnection annex is controlled to disconnect.
Preferably, described control unit includes the first sample circuit and the first comparison circuit；
Described first sample circuit is used for the voltage signal to voltage detection unit real-time detection
Sampled, to obtain voltage sampling signal, and by described voltage sampling signal send to
First comparison circuit；
It is preset with voltage reference in described first comparison circuit and reversely judges signal, for inciting somebody to action
Described voltage sampling signal and described voltage reference reversely judge that signal is compared, if institute
State voltage sampling signal and reversely judge signal more than described voltage reference, then judge that direct current is defeated
Enter proper negative pole reversal connection, and export corresponding digital signal level and drive controlled disconnection annex
Disconnect；If described voltage sampling signal reversely judges signal less than or equal to described voltage reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level to drive
Controlled disconnection annex adhesive.
Preferably, described direct-flow input end reverse connection prevention protection circuit also includes current detecting list
Unit, described current detecting unit is connected between controlled disconnection annex and late-class circuit, uses
Current signal in real-time detection direct-flow input end reverse connection prevention protection circuit, and will detect
Result sends to control unit；
Described control unit is also connected with current detecting unit, and for controlling controlled breaking
After opening annex adhesive, the testing result according to current detecting unit judges that direct current is defeated further
Enter the whether reversal connection of proper negative pole, if it is determined that reversal connection, then control controlled disconnection annex to disconnect,
If it is determined that just connecing, then controlled disconnection annex is controlled to keep adhesive.
Preferably, described control unit specifically for：Controlling controlled disconnection annex adhesive
Afterwards,
If the testing result of current detecting unit is in direct-flow input end reverse connection prevention protection circuit
The flow direction of electric current is reverse, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled
Disconnect annex to disconnect；
If the testing result of current detecting unit is in direct-flow input end reverse connection prevention protection circuit
The flow direction of electric current is forward direction, then judge that direct-flow input end both positive and negative polarity just connects, and control controlled
Disconnect annex and keep adhesive.
Preferably, it is preset with reversing the current normal value in described control unit, be additionally operable to
The testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit
Flow to for reverse when, obtain this reverse value of current, judge described reverse value of current whether than
Described reversing the current normal value has more 0～50%, in this way, then judges that direct-flow input end is positive and negative
Pole reversal connection, and control controlled disconnection annex to disconnect, such as no, then just judging direct-flow input end
Negative pole just connects, and controls controlled disconnection annex to keep adhesive.
Preferably, described control unit includes the second sample circuit and the second comparison circuit；
Described second sample circuit is used for the current signal to current detecting unit real-time detection
Sampled, to draw current sampling signal, and by described current sampling signal send to
Second comparison circuit；
It is preset with current reference in described second comparison circuit and reversely judges signal, for inciting somebody to action
Described current sampling signal and described current reference reversely judge that signal is compared, if institute
State current sampling signal and reversely judge signal more than described current reference, then judge that direct current is defeated
Enter proper negative pole reversal connection, and export corresponding digital signal level and drive controlled disconnection annex
Disconnect；If described current sampling signal reversely judges signal less than or equal to described current reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level to drive
Controlled disconnection annex keeps adhesive.
Preferably, described controlled disconnection annex adopts controllable relays, contactor, dropout
Any one in device.
The present invention also provides a kind of the straight of the above-mentioned direct-flow input end reverse connection prevention protection circuit of inclusion
Stream input equipment.
The present invention also provides a kind of direct-flow input end anti-reverse guard method, walks including following
Suddenly：
1) voltage signal between real-time detection direct-flow input end both positive and negative polarity；
2) according to step 1) testing result judge the whether reversal connection of direct-flow input end both positive and negative polarity,
If it is determined that reversal connection, then direct-flow input end place circuit is made to disconnect with late-class circuit, if it is determined that
Just connect, then so that direct-flow input end place circuit is connected with late-class circuit.
Preferably, described step 2) it is specially：
After electricity on the circuit of direct-flow input end place,
If described testing result is the voltage between direct-flow input end both positive and negative polarity is negative pressure,
Judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and rear class electricity
Road disconnects；
If described testing result is the voltage between direct-flow input end both positive and negative polarity is malleation,
Judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class electricity
Road connects.
Preferably, described step 2) also include：
Preset negative positive pressure constant value；
When described testing result is that voltage between direct-flow input end both positive and negative polarity is negative pressure,
Obtain this negative pressure value, judge whether described negative pressure value has more than described negative pressure normal value
0～50%, in this way, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end
Place circuit is disconnected with late-class circuit, such as no, then judge that direct-flow input end both positive and negative polarity just connects,
And so that direct-flow input end place circuit is connected with late-class circuit.
Preferably, described step 2) also include：Electricity on the circuit of direct-flow input end place
Before, direct-flow input end place circuit is made to disconnect with late-class circuit.
Preferably, described step 2) it is specially：
Voltage signal between the direct-flow input end both positive and negative polarity of real-time detection is sampled,
To obtain voltage sampling signal；
Predeterminated voltage benchmark reversely judges signal；
Described voltage sampling signal and described voltage reference are reversely judged that signal is compared
Relatively, if described voltage sampling signal reversely judges signal more than described voltage reference, sentence
Determine direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and late-class circuit
Disconnect；If described voltage sampling signal reversely judges signal less than or equal to described voltage reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class
Circuit communication.
Preferably, methods described also includes：
3) real-time detection direct-flow input end current signal in circuit；
4) after so that direct-flow input end place circuit is connected with late-class circuit, according to step 3)
Testing result judge the whether reversal connection of direct-flow input end both positive and negative polarity further, if it is determined that reversal connection,
So that direct-flow input end place circuit is disconnected with late-class circuit, if it is determined that just connecing, then making straight
Stream input place circuit keeps connecting with late-class circuit.
Preferably, described step 4) it is specially：Make direct-flow input end place circuit with
After late-class circuit connection,
If described testing result be direct-flow input end the flow direction of electric current in circuit be anti-
To, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit with
Late-class circuit disconnects；
If described testing result be direct-flow input end in circuit electric current flow direction be just
To, then judge direct-flow input end both positive and negative polarity just connect, and make direct-flow input end place circuit with
Late-class circuit keeps connection.
Preferably, described step 4) also include：
Default reversing the current normal value；
Described testing result be direct-flow input end the flow direction of electric current in circuit be reverse
When, obtain this reverse value of current, judge described reverse value of current whether than described reverse electricity
Stream normal value has more 0～50%, in this way, then judges direct-flow input end both positive and negative polarity reversal connection, and
Direct-flow input end place circuit is made to disconnect with late-class circuit, such as no, then judge direct current input
Proper negative pole just connects, and so that direct-flow input end place circuit is connected with late-class circuit.
Preferably, described step 4) it is specially：
To the direct-flow input end of real-time detection current signal in circuit sample,
To draw current sampling signal；
Predetermined current benchmark reversely judges signal；
Described current sampling signal and described current reference are reversely judged that signal is compared
Relatively, if described current sampling signal reversely judges signal more than described current reference, sentence
Determine direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and late-class circuit
Disconnect；If described current sampling signal reversely judges signal less than or equal to described current reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class
Circuit communication.
Beneficial effect：
1) direct-flow input end reverse connection prevention protection circuit of the present invention is examined by voltage therein
Survey unit, controlled disconnection annex and control unit, just can determine that direct-flow input end both positive and negative polarity
Whether reversal connection, and control controlled disconnection annex to disconnect when judging reversal connection, with protect with straight
In direct-flow input end in the late-class circuit that stream input place circuit is connected, with prior art
The scheme of setting diode is compared, and cost is relatively low, and will not increase the power consumption of system.
2) in direct-flow input end reverse connection prevention protection circuit of the present invention, also there is current detecting
Unit, to judge the whether reversal connection of direct-flow input end both positive and negative polarity further, thus serve double
Protective effect again, improves the reliability of system.
3) direct-flow input end reverse connection prevention protection circuit structure of the present invention simple it is easy to real
Apply.
Brief description
Fig. 1 is the structural representation of direct-flow input end reverse connection prevention protection circuit described in prior art
Figure；
Fig. 2 is direct-flow input end reverse connection prevention protection circuit described in the embodiment of the present invention 1
Structural representation；
Fig. 3 is the anti-reverse guard method of direct-flow input end described in the embodiment of the present invention 1
Flow chart；
Fig. 4 is direct-flow input end reverse connection prevention protection circuit described in the embodiment of the present invention 2
Workflow diagram；
Fig. 5 is the anti-reverse guard method of direct-flow input end described in the embodiment of the present invention 2
Flow chart；
Fig. 6 is the anti-reverse guard method of direct-flow input end described in the embodiment of the present invention 3
Flow chart；
Fig. 7 is direct-flow input end reverse connection prevention protection circuit described in the embodiment of the present invention 4
Structural representation；
Fig. 8 is direct-flow input end reverse connection prevention protection circuit described in the embodiment of the present invention 4
Workflow diagram；
Fig. 9 is the anti-reverse guard method of direct-flow input end described in the embodiment of the present invention 4
Flow chart；
Figure 10 is the anti-reverse guard method of direct-flow input end described in the embodiment of the present invention 5
Flow chart.
Specific embodiment
For making those skilled in the art more fully understand technical scheme, tie below
Close drawings and Examples to direct-flow input end reverse connection prevention protection circuit of the present invention and side
Method, direct current input equipment are described in further detail.
Embodiment 1：
As shown in Fig. 2 the present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit,
It includes：Controlled disconnection annex, voltage detection unit and control unit.
Described controlled disconnection annex is connected between direct-flow input end and late-class circuit.
Described voltage detection unit is connected in parallel between direct-flow input end both positive and negative polarity, for real-time
Voltage signal between detection direct-flow input end both positive and negative polarity, and testing result is sent to control
Unit processed.
Described control unit is connected with voltage detection unit and controlled disconnection annex respectively, uses
Judge whether direct-flow input end both positive and negative polarity is anti-in the testing result according to voltage detection unit
Connect, if it is determined that reversal connection, then control controlled disconnection annex to disconnect, to protect late-class circuit,
Preventing it impaired, if it is determined that just connecing, then controlling controlled disconnection annex adhesive, after ensureing
Level normal operation circuit.
Described control unit can adopt existing single-chip microcomputer, DSP (digital signal processor)
Deng logic control device.
After control unit judges direct-flow input end both positive and negative polarity reversal connection, direct current input need to be exchanged
Binding post, then is continued to sentence according to the testing result of voltage detection unit by control unit
Determine the whether reversal connection of direct-flow input end both positive and negative polarity.
Preferably, described controlled disconnection annex adopts controllable relays, contactor, dropout
Any one in device.Controlled disconnected except being automatically controlled according to its result of determination by control unit
Open outside annex disconnection or adhesive, also can point out staff, be controlled manually by staff
Make controlled disconnection annex to disconnect or adhesive.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
As shown in figure 3, the present embodiment also provides a kind of direct-flow input end anti-reverse protection side
Method, comprises the steps：
S101. the voltage signal between real-time detection direct-flow input end both positive and negative polarity.
S102. whether the testing result according to step s101 judges direct-flow input end both positive and negative polarity
Reversal connection, if it is determined that reversal connection, then makes direct-flow input end place circuit disconnect with late-class circuit,
If it is determined that just connecing, then direct-flow input end place circuit is made to connect with late-class circuit.
Embodiment 2：
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation
Identical with Fig. 2), wherein, described control unit specifically for：
After electricity on direct-flow input end reverse connection prevention protection circuit,
If the testing result of described voltage detection unit is between direct-flow input end both positive and negative polarity
Voltage is negative pressure, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled disconnection attached
Part disconnects；
If the testing result of described voltage detection unit is between direct-flow input end both positive and negative polarity
Voltage is malleation, then judge that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection attached
Part adhesive.
Described control unit can adopt existing single-chip microcomputer, DSP (digital signal processor)
Deng logic control device.
It should be noted that the testing result of described voltage detection unit includes：Examine in real time
Voltage signal between the direct-flow input end both positive and negative polarity measuring, and believed according to described voltage
Number conclusion that can immediately arrive at, such as the voltage between direct-flow input end both positive and negative polarity is just
Pressure or negative pressure.
Because there is certain mistake in the voltage signal that voltage detection unit detects
Difference, drift or fluctuate, in order to prevent erroneous judgement it is preferable that pre- in described control unit
It is provided with negative pressure normal value, being additionally operable in the testing result of voltage detection unit is direct current input
When voltage between proper negative pole is negative pressure, obtains this negative pressure value, judge described negative pressure value
Whether have more 0～50% (such as 10%) than described negative pressure normal value, in this way, then judge
Direct-flow input end both positive and negative polarity reversal connection, and control controlled disconnection annex to disconnect, such as no, then sentence
Determine direct-flow input end both positive and negative polarity just to connect, and control controlled disconnection annex adhesive.That is,
Even if the testing result of voltage detection unit is negative pressure, also not necessarily judge direct-flow input end
When both positive and negative polarity reversal connection, such as this negative pressure value are without departing from the number range specifying, then judge
Direct-flow input end both positive and negative polarity just connects.Described negative pressure normal value can be by those skilled in the art's root
According to the voltage condition sets itself between direct-flow input end both positive and negative polarity, described negative pressure normal value
Can be a number range or a concrete numerical value.
The workflow of direct-flow input end reverse connection prevention protection circuit is described in detail in detail below by Fig. 4：
S201. make electricity on direct-flow input end reverse connection prevention protection circuit.
S202. pass through between voltage detection unit real-time detection direct-flow input end both positive and negative polarity
Voltage signal, if the testing result of voltage detection unit is negative pressure, execution step s203,
If the testing result of voltage detection unit is malleation, execution step s206.
S203. preset negative positive pressure constant value in control unit, judge described negative pressure value whether than
Described negative pressure normal value has more 10%, in this way, then execution step s204, such as no, then hold
Row step s206.
S204. control unit judges direct-flow input end both positive and negative polarity reversal connection, and controls controlled disconnection
Annex disconnects.
S205. exchange direct current input wires terminal, and return to step s202.
S206. control unit judges that direct-flow input end both positive and negative polarity just connects, and controls controlled disconnection
Annex adhesive.
It should be noted that in such scheme, in direct-flow input end reverse connection prevention protection circuit
Before upper electricity, control unit is simultaneously unaware of the state of controlled disconnection annex, you can control disconnects
Annex is likely to be at off-state it is also possible to be in attracting state, if controlled disconnection is attached
Part is off, and direct-flow input end both positive and negative polarity reversal connection, then voltage detection unit
Testing result one is set to negative pressure, if direct-flow input end both positive and negative polarity just connects, voltage detecting list
The testing result one of unit is set to malleation；And if controlled disconnection annex is in attracting state,
Then no matter direct-flow input end both positive and negative polarity whether reversal connection, the testing result of voltage detection unit is equal
For malleation.Therefore, there is the possibility of erroneous judgement in control unit.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
As shown in figure 5, the present embodiment also provides a kind of direct-flow input end anti-reverse protection side
Method, comprises the steps：
S301. the voltage signal between real-time detection direct-flow input end both positive and negative polarity.
S302. after electricity on the circuit of direct-flow input end place,
If the testing result of step s301 is that between direct-flow input end both positive and negative polarity, voltage is negative
Pressure, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit with
Late-class circuit disconnects；
If the testing result of step s301 is that between direct-flow input end both positive and negative polarity, voltage is just
Pressure, then judge direct-flow input end both positive and negative polarity just connect, and make direct-flow input end place circuit with
Late-class circuit connects.
It should be noted that the testing result of described step s301 includes：Real-time detection arrives
Direct-flow input end both positive and negative polarity between voltage signal, and according to described voltage signal energy
Voltage between the conclusion enough immediately arriving at, such as direct-flow input end both positive and negative polarity be malleation also
It is negative pressure.
May there is certain error, drift or fluctuation in the voltage signal due to detecting,
In order to prevent erroneous judgement it is preferable that described step s302 also includes：
Preset negative positive pressure constant value；
When described testing result is that voltage between direct-flow input end both positive and negative polarity is negative pressure,
Obtain this negative pressure value, judge whether described negative pressure value has more than described negative pressure normal value
0～50%, in this way, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end
Place circuit is disconnected with late-class circuit, such as no, then judge that direct-flow input end both positive and negative polarity just connects,
And so that direct-flow input end place circuit is connected with late-class circuit.
Other structures in the present embodiment, method and effect are all same as Example 1, this
In repeat no more.
Embodiment 3：
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation
Identical with Fig. 2), wherein, described control unit includes the first sample circuit and the first ratio
Compared with circuit, that is, control unit is not required to using the logic control device described in embodiment 1～2,
Only controlled disconnection annex adhesive/disconnection need to be can control using hardware circuit.
Described first sample circuit is used for the voltage signal to voltage detection unit real-time detection
Sampled, to obtain voltage sampling signal, and by described voltage sampling signal send to
First comparison circuit.
It is preset with voltage reference in described first comparison circuit and reversely judges signal, for inciting somebody to action
Described voltage sampling signal and described voltage reference reversely judge that signal is compared, if institute
State voltage sampling signal and reversely judge signal more than described voltage reference, then judge that direct current is defeated
Enter proper negative pole reversal connection, and export corresponding digital signal level and drive controlled disconnection annex
Disconnect；If described voltage sampling signal reversely judges signal less than or equal to described voltage reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level to drive
Controlled disconnection annex adhesive.Described voltage reference reversely judges that signal can be by art technology
Personnel are according to the voltage condition designed, designed between direct-flow input end both positive and negative polarity.Described numeral
Level signal can be high level signal or low level signal, for example described first comparison circuit
During output high level signal, controlled disconnection annex is driven to disconnect, during output low level signal,
Drive controlled disconnection annex adhesive；Vice versa.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
As shown in fig. 6, the present embodiment also provides a kind of direct-flow input end anti-reverse protection side
Method, comprises the steps：
S401. the voltage signal between real-time detection direct-flow input end both positive and negative polarity.
S402. the voltage signal between the direct-flow input end both positive and negative polarity of real-time detection is carried out
Sampling, to obtain voltage sampling signal；
Predeterminated voltage benchmark reversely judges signal；
Described voltage sampling signal and described voltage reference are reversely judged that signal is compared
Relatively, if described voltage sampling signal reversely judges signal more than described voltage reference, sentence
Determine direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and late-class circuit
Disconnect；If described voltage sampling signal reversely judges signal less than or equal to described voltage reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class
Circuit communication.
Other structures in the present embodiment, method and effect are all same as Example 1, this
In repeat no more.
Embodiment 4：
As shown in fig. 7, the present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit,
It with the difference of circuit described in embodiment 2 is,
Described direct-flow input end reverse connection prevention protection circuit also includes current detecting unit, described
Current detecting unit is connected between controlled disconnection annex and late-class circuit, examines for real-time
Survey the current signal in direct-flow input end reverse connection prevention protection circuit, and testing result is sent
To control unit；
Described control unit is also connected with current detecting unit, and for controlling controlled breaking
After opening annex adhesive, the testing result according to current detecting unit judges that direct current is defeated further
Enter the whether reversal connection of proper negative pole, if it is determined that reversal connection, then control controlled disconnection annex to disconnect,
If it is determined that just connecing, then controlled disconnection annex is controlled to keep adhesive.
Preferably, described control unit specifically for：Controlling controlled disconnection annex adhesive
Afterwards, if the testing result of current detecting unit is in direct-flow input end reverse connection prevention protection circuit
The flow direction of electric current is reverse, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled
Disconnect annex to disconnect；
If the testing result of current detecting unit is in direct-flow input end reverse connection prevention protection circuit
The flow direction of electric current is forward direction, then judge that direct-flow input end both positive and negative polarity just connects, and control controlled
Disconnect annex and keep adhesive.
It should be noted that described testing result is reversely to refer to direct-flow input end to prevent
In reverse-connection protection circuit, sense of current is contrary with sense of current under normal circumstances；Described
Testing result is the side that forward direction refers to electric current in direct-flow input end reverse connection prevention protection circuit
To identical with sense of current under normal circumstances.
The testing result of described current detecting unit includes：The direct current input that real-time detection arrives
Current signal in the reverse connection prevention protection circuit of end, and can be straight according to described current signal
Connect the conclusion drawing, such as in direct-flow input end reverse connection prevention protection circuit, the flow direction of electric current is
Positive or reverse.
Because there is certain mistake in the current signal that current detecting unit detects
Difference, drift or fluctuate, in order to prevent erroneous judgement it is preferable that pre- in described control unit
It is provided with reversing the current normal value, being additionally operable in the testing result of current detecting unit is direct current
When the flow direction of electric current is reverse in input reverse connection prevention protection circuit, obtain this reversing the current
Value, judges whether described reverse value of current has more 0～50% than described reversing the current normal value
(such as 10%), in this way, then judges direct-flow input end both positive and negative polarity reversal connection, and control can
Control disconnects annex and disconnects, such as no, then judge that direct-flow input end both positive and negative polarity just connects, and control
Controlled disconnection annex keeps adhesive.Even if that is, the detection knot of current detecting unit
Fruit is reverse, also not necessarily judges direct-flow input end both positive and negative polarity reversal connection, such as this reverse electricity
When flow valuve is without departing from the number range specifying, then judge that direct-flow input end both positive and negative polarity just connects.
Described reversing the current normal value can be anti-reverse according to direct-flow input end by those skilled in the art
The situation sets itself of electric current in protection circuit, described reversing the current normal value can be one
Individual number range or a concrete numerical value.
The workflow of direct-flow input end reverse connection prevention protection circuit is described in detail in detail below by Fig. 8：
S501～s506 is identical with the s201～s206 in embodiment 2 respectively, repeats no more.
S507. pass through current detecting unit real-time detection direct-flow input end anti-reverse protection electricity
Current signal in road, if the testing result of current detecting unit is reverse, executes step
Rapid s508, if the testing result of current detecting unit is forward direction, execution step s511.
S508. preset reversing the current normal value in control unit, judge described reversing the current
Whether value has more 10% than described reversing the current normal value, in this way, then execution step s509,
As no, then execution step s511.
S509. control unit judges direct-flow input end both positive and negative polarity reversal connection, and controls controlled disconnection
Annex disconnects.
S510. exchange direct current input wires terminal, and return to step s507.
S511. control unit judges that direct-flow input end both positive and negative polarity just connects, and controls controlled disconnection
Annex keeps adhesive.
It can be seen that, the present embodiment, due to increased current detecting unit, is prevented in direct-flow input end
Before electricity on reverse-connection protection circuit, if controlled disconnection annex is off, root
Just can judge whether direct-flow input end both positive and negative polarity is anti-according to the testing result of voltage detection unit
Connect, and current detecting unit judges the whether reversal connection of direct-flow input end both positive and negative polarity further, rise
Arrive the effect of duplicate protection；If controlled disconnection annex is in attracting state, basis
The testing result of voltage detection unit cannot judge the whether reversal connection of direct-flow input end both positive and negative polarity,
And according to the testing result of current detecting unit can direct-flow input end both positive and negative polarity be further
No reversal connection, therefore current detecting unit overcome the defect of control unit erroneous judgement, improve
The reliability of circuit.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
As shown in figure 9, the present embodiment also provides a kind of direct-flow input end anti-reverse protection side
Method, comprises the steps：
S601-s602 is identical with the s301-s302 in embodiment 2, repeats no more.
S603. real-time detection direct-flow input end current signal in circuit；
S604. after so that direct-flow input end place circuit is connected with late-class circuit, according to step
The testing result of s603 judges the whether reversal connection of direct-flow input end both positive and negative polarity further, if it is determined that
Reversal connection, then make direct-flow input end place circuit disconnect with late-class circuit, if it is determined that just connecing,
Direct-flow input end place circuit is then made to keep connecting with late-class circuit.
Preferably, described step s604 is specially：
After so that direct-flow input end place circuit is connected with late-class circuit,
If described testing result be direct-flow input end the flow direction of electric current in circuit be anti-
To, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit with
Late-class circuit disconnects；
If described testing result be direct-flow input end in circuit electric current flow direction be just
To, then judge direct-flow input end both positive and negative polarity just connect, and make direct-flow input end place circuit with
Late-class circuit keeps connection.
It should be noted that the testing result of described step s603 includes：Real-time detection arrives
Direct-flow input end current signal in circuit, and according to described current signal energy
The conclusion enough immediately arriving at, such as direct-flow input end in circuit electric current flow direction be just
To still reversely.
May there is certain error, drift or fluctuation in the current signal due to detecting,
In order to prevent erroneous judgement it is preferable that described step s604 also includes：
Default reversing the current normal value；
Described testing result be direct-flow input end the flow direction of electric current in circuit be reverse
When, obtain this reverse value of current, judge described reverse value of current whether than described reverse electricity
Stream normal value has more 0～50%, in this way, then judges direct-flow input end both positive and negative polarity reversal connection, and
Direct-flow input end place circuit is made to disconnect with late-class circuit, such as no, then judge direct current input
Proper negative pole just connects, and makes direct-flow input end place circuit keep connecting with late-class circuit.
Other structures in the present embodiment, method and effect are all same as Example 2, this
In repeat no more.
Embodiment 5：
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation
Identical with Fig. 7), wherein, described control unit includes the second sample circuit and the second ratio
Compared with circuit.
Described second sample circuit is used for the current signal to current detecting unit real-time detection
Sampled, to draw current sampling signal, and by described current sampling signal send to
Second comparison circuit.
It is preset with current reference in described second comparison circuit and reversely judges signal, for inciting somebody to action
Described current sampling signal and described current reference reversely judge that signal is compared, if institute
State current sampling signal and reversely judge signal more than described current reference, then judge that direct current is defeated
Enter proper negative pole reversal connection, and export corresponding digital signal level and drive controlled disconnection annex
Disconnect；If described current sampling signal reversely judges signal less than or equal to described current reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level to drive
Controlled disconnection annex keeps adhesive.Described current reference reversely judges that signal can be by this area
Technical staff voluntarily sets according to the current conditions in direct-flow input end reverse connection prevention protection circuit
Meter.Described digital signal level can be high level signal or low level signal, for example described
During the second comparison circuit output high level signal, controlled disconnection annex is driven to disconnect, output
During low level signal, drive controlled disconnection annex adhesive；Vice versa.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
As shown in Figure 10, the present embodiment also provides a kind of direct-flow input end anti-reverse protection side
Method, comprises the steps：
S701-s703 is identical with the s601-s603 in embodiment 4, repeats no more.
S704. to the direct-flow input end of real-time detection current signal in circuit carry out
Sampling, to draw current sampling signal；
Predetermined current benchmark reversely judges signal；
Described current sampling signal and described current reference are reversely judged that signal is compared
Relatively, if described current sampling signal reversely judges signal more than described current reference, sentence
Determine direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and late-class circuit
Disconnect；If described current sampling signal reversely judges signal less than or equal to described current reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class
Circuit communication.
Other structures in the present embodiment, method and effect are all same as Example 4, this
In repeat no more.
Embodiment 6：
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation
Identical with Fig. 2), it with the difference of circuit described in embodiment 2 is,
Described control unit is additionally operable to：Electricity on direct-flow input end reverse connection prevention protection circuit
Before, control controlled disconnection annex to disconnect.
It can be seen that, before the present embodiment is due to electricity on direct-flow input end reverse connection prevention protection circuit
Controlled disconnection annex is forced to disconnect, therefore, if direct-flow input end both positive and negative polarity reversal connection,
The testing result one of voltage detection unit is set to negative pressure, if direct-flow input end both positive and negative polarity just connects,
Then the testing result one of voltage detection unit is set to malleation, with circuit phase described in embodiment 2
Ratio overcomes the defect of control unit erroneous judgement, improves the reliability of circuit.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
The present embodiment also provides a kind of direct-flow input end anti-reverse guard method, its with implement
The difference of example 2 methods described is,
Described step s302 also includes：Before electricity on the circuit of direct-flow input end place, make
Direct-flow input end place circuit is disconnected with late-class circuit.
Other structures in the present embodiment, method and effect are all same as Example 2, this
In repeat no more.
Embodiment 7：
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation
Identical with Fig. 7), it with the difference of circuit described in embodiment 4 is,
Described control unit is additionally operable to：Electricity on direct-flow input end reverse connection prevention protection circuit
Before, control controlled disconnection annex to disconnect.
In the present embodiment, incite somebody to action due to before electricity on direct-flow input end reverse connection prevention protection circuit
Controlled disconnection annex is forced to disconnect, therefore just can be sentenced according to the testing result of voltage detection unit
The whether reversal connection of disconnected direct-flow input end both positive and negative polarity, and be to enter one using current detecting unit
Step judges the whether reversal connection of direct-flow input end both positive and negative polarity, thus playing the effect of duplicate protection.
The present embodiment also provides a kind of direct current input equipment, and it includes late-class circuit and above-mentioned
Direct-flow input end reverse connection prevention protection circuit.
The present embodiment also provides a kind of direct-flow input end anti-reverse guard method, its with implement
The difference of example 3 methods described is,
Described step s602 also includes：Before electricity on the circuit of direct-flow input end place, make
Direct-flow input end place circuit is disconnected with late-class circuit.
Other structures in the present embodiment, method and effect are all same as Example 4, this
In repeat no more.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present
And the illustrative embodiments adopting, but the invention is not limited in this.For ability
For those of ordinary skill in domain, in the situation without departing from spirit and substance of the present invention
Under, various modifications and improvement can be made, these modifications and improvement are also considered as the present invention's
Protection domain.
Claims (14)
1. a kind of direct-flow input end reverse connection prevention protection circuit is it is characterised in that include：Can
Control disconnects annex, voltage detection unit and control unit；
Described controlled disconnection annex is connected between direct-flow input end and late-class circuit；
Described voltage detection unit is connected in parallel between direct-flow input end both positive and negative polarity, for real-time
Voltage signal between detection direct-flow input end both positive and negative polarity, and testing result is sent to control
Unit processed；
Described control unit is connected with voltage detection unit and controlled disconnection annex respectively, uses
Judge whether direct-flow input end both positive and negative polarity is anti-in the testing result according to voltage detection unit
Connect, if it is determined that reversal connection, then controlling controlled disconnection annex to disconnect, if it is determined that just connecing, then controlling
Make controlled disconnection annex adhesive,
Described control unit specifically for：
After electricity on direct-flow input end reverse connection prevention protection circuit,
If the testing result of described voltage detection unit is between direct-flow input end both positive and negative polarity
Voltage is negative pressure, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled disconnection attached
Part disconnects；
If the testing result of described voltage detection unit is between direct-flow input end both positive and negative polarity
Voltage is malleation, then judge that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection attached
Part adhesive；
Described direct-flow input end reverse connection prevention protection circuit also includes current detecting unit, described
Current detecting unit is connected between controlled disconnection annex and late-class circuit, examines for real-time
Survey the current signal in direct-flow input end reverse connection prevention protection circuit, and testing result is sent
To control unit；
Described control unit is also connected with current detecting unit, and for controlling controlled breaking
After opening annex adhesive, the testing result according to current detecting unit judges that direct current is defeated further
Enter the whether reversal connection of proper negative pole, if it is determined that reversal connection, then control controlled disconnection annex to disconnect,
If it is determined that just connecing, then controlled disconnection annex is controlled to keep adhesive,
Described control unit specifically for：After controlling controlled disconnection annex adhesive,
If the testing result of current detecting unit is in direct-flow input end reverse connection prevention protection circuit
The flow direction of electric current is reverse, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled
Disconnect annex to disconnect；
If the testing result of current detecting unit is in direct-flow input end reverse connection prevention protection circuit
The flow direction of electric current is forward direction, then judge that direct-flow input end both positive and negative polarity just connects, and control controlled
Disconnect annex and keep adhesive.
2. circuit according to claim 1 is it is characterised in that described control unit
Inside it is preset with negative pressure normal value, being additionally operable in the testing result of voltage detection unit is direct current
When voltage between input both positive and negative polarity is negative pressure, obtain this negative pressure value, judge described negative
Whether pressure value has more 0～50% than described negative pressure normal value, in this way, then judges direct current input
Proper negative pole reversal connection, and control controlled disconnection annex to disconnect, such as no, then judge that direct current is defeated
Enter proper negative pole just to connect, and control controlled disconnection annex adhesive.
3. circuit according to claim 1 is it is characterised in that described control unit
It is additionally operable to：Before electricity on direct-flow input end reverse connection prevention protection circuit, control controlled disconnection
Annex disconnects.
4. circuit according to claim 1 it is characterised in that
Described control unit includes the first sample circuit and the first comparison circuit；
Described first sample circuit is used for the voltage signal to voltage detection unit real-time detection
Sampled, to obtain voltage sampling signal, and by described voltage sampling signal send to
First comparison circuit；
It is preset with voltage reference in described first comparison circuit and reversely judges signal, for inciting somebody to action
Described voltage sampling signal and described voltage reference reversely judge that signal is compared, if institute
State voltage sampling signal and reversely judge signal more than described voltage reference, then judge that direct current is defeated
Enter proper negative pole reversal connection, and export corresponding digital signal level and drive controlled disconnection annex
Disconnect；If described voltage sampling signal reversely judges signal less than or equal to described voltage reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level to drive
Controlled disconnection annex adhesive.
5. circuit according to claim 1 is it is characterised in that described control unit
Inside it is preset with reversing the current normal value, being additionally operable to the testing result in current detecting unit is
When the flow direction of electric current is reverse in direct-flow input end reverse connection prevention protection circuit, obtain this reverse
Current value, judges whether described reverse value of current has more than described reversing the current normal value
0～50%, in this way, then judge direct-flow input end both positive and negative polarity reversal connection, and control controlled disconnection
Annex disconnects, such as no, then judge that direct-flow input end both positive and negative polarity just connects, and controls controlled disconnected
Open annex and keep adhesive.
6. circuit according to claim 1 it is characterised in that
Described control unit includes the second sample circuit and the second comparison circuit；
Described second sample circuit is used for the current signal to current detecting unit real-time detection
Sampled, to draw current sampling signal, and by described current sampling signal send to
Second comparison circuit；
It is preset with current reference in described second comparison circuit and reversely judges signal, for inciting somebody to action
Described current sampling signal and described current reference reversely judge that signal is compared, if institute
State current sampling signal and reversely judge signal more than described current reference, then judge that direct current is defeated
Enter proper negative pole reversal connection, and export corresponding digital signal level and drive controlled disconnection annex
Disconnect；If described current sampling signal reversely judges signal less than or equal to described current reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level to drive
Controlled disconnection annex keeps adhesive.
7. circuit according to claim 1 is it is characterised in that described controlled disconnection
Annex adopts any one in controllable relays, contactor, electrical apparatus release.
8. a kind of direct current input equipment is it is characterised in that include as in claim 1-7
Direct-flow input end reverse connection prevention protection circuit described in any one.
9. a kind of anti-reverse guard method of direct-flow input end is it is characterised in that include as follows
Step：
1) voltage signal between real-time detection direct-flow input end both positive and negative polarity；
2) according to step 1) testing result judge the whether reversal connection of direct-flow input end both positive and negative polarity,
If it is determined that reversal connection, then direct-flow input end place circuit is made to disconnect with late-class circuit, if it is determined that
Just connect, then so that direct-flow input end place circuit is connected with late-class circuit,
Described step 2) it is specially：
After electricity on the circuit of direct-flow input end place,
If described testing result is the voltage between direct-flow input end both positive and negative polarity is negative pressure,
Judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and rear class electricity
Road disconnects；
If described testing result is the voltage between direct-flow input end both positive and negative polarity is malleation,
Judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class electricity
Road connects；
3) real-time detection direct-flow input end current signal in circuit；
4) after so that direct-flow input end place circuit is connected with late-class circuit, according to step 3)
Testing result judge the whether reversal connection of direct-flow input end both positive and negative polarity further, if it is determined that reversal connection,
So that direct-flow input end place circuit is disconnected with late-class circuit, if it is determined that just connecing, then making straight
Stream input place circuit keeps connecting with late-class circuit,
Described step 4) it is specially：Make direct-flow input end place circuit and late-class circuit
After connection,
If described testing result be direct-flow input end the flow direction of electric current in circuit be anti-
To, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit with
Late-class circuit disconnects；
If described testing result be direct-flow input end in circuit electric current flow direction be just
To, then judge direct-flow input end both positive and negative polarity just connect, and make direct-flow input end place circuit with
Late-class circuit keeps connection.
10. method according to claim 9 is it is characterised in that described step 2)
Also include：
Preset negative positive pressure constant value；
When described testing result is that voltage between direct-flow input end both positive and negative polarity is negative pressure,
Obtain this negative pressure value, judge whether described negative pressure value has more than described negative pressure normal value
0～50%, in this way, then judge direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end
Place circuit is disconnected with late-class circuit, such as no, then judge that direct-flow input end both positive and negative polarity just connects,
And so that direct-flow input end place circuit is connected with late-class circuit.
11. methods according to claim 9 are it is characterised in that described step 2)
Also include：Before electricity on the circuit of direct-flow input end place, make electricity that direct-flow input end is located
Road is disconnected with late-class circuit.
12. method according to claim 9 is it is characterised in that described step 2)
It is specially：
Voltage signal between the direct-flow input end both positive and negative polarity of real-time detection is sampled,
To obtain voltage sampling signal；
Predeterminated voltage benchmark reversely judges signal；
Described voltage sampling signal and described voltage reference are reversely judged that signal is compared
Relatively, if described voltage sampling signal reversely judges signal more than described voltage reference, sentence
Determine direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and late-class circuit
Disconnect；If described voltage sampling signal reversely judges signal less than or equal to described voltage reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class
Circuit communication.
13. methods according to claim 9 are it is characterised in that described step 4)
Also include：
Default reversing the current normal value；
Described testing result be direct-flow input end the flow direction of electric current in circuit be reverse
When, obtain this reverse value of current, judge described reverse value of current whether than described reverse electricity
Stream normal value has more 0～50%, in this way, then judges direct-flow input end both positive and negative polarity reversal connection, and
Direct-flow input end place circuit is made to disconnect with late-class circuit, such as no, then judge direct current input
Proper negative pole just connects, and so that direct-flow input end place circuit is connected with late-class circuit.
14. methods according to claim 9 are it is characterised in that described step 4)
It is specially：
To the direct-flow input end of real-time detection current signal in circuit sample,
To draw current sampling signal；
Predetermined current benchmark reversely judges signal；
Described current sampling signal and described current reference are reversely judged that signal is compared
Relatively, if described current sampling signal reversely judges signal more than described current reference, sentence
Determine direct-flow input end both positive and negative polarity reversal connection, and make direct-flow input end place circuit and late-class circuit
Disconnect；If described current sampling signal reversely judges signal less than or equal to described current reference,
Then judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and rear class
Circuit communication.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310312311.7A CN103545804B (en) | 2013-07-23 | 2013-07-23 | Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment |
| PCT/CN2014/081723 WO2015010528A1 (en) | 2013-07-23 | 2014-07-07 | Reverse connection-proof circuit and method for direct current input terminal and direct current input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310312311.7A CN103545804B (en) | 2013-07-23 | 2013-07-23 | Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment |
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| CN103545804B true CN103545804B (en) | 2017-02-08 |
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| CN103545804B (en) * | 2013-07-23 | 2017-02-08 | 特变电工新疆新能源股份有限公司 | Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment |
| CN104333319B (en) * | 2014-11-10 | 2017-12-22 | 许继电气股份有限公司 | Input reverse-connection protection circuit for photovoltaic combining inverter |
| CN107727912A (en) * | 2016-08-12 | 2018-02-23 | 中芯国际集成电路制造(上海)有限公司 | Analog signal detection circuit and analog signal detection method |
| CN106451370B (en) * | 2016-10-27 | 2018-08-24 | 中国北方车辆研究所 | A kind of high voltage connector band load disjunction control method |
| CN107807305B (en) * | 2017-10-30 | 2020-07-07 | 阳光电源股份有限公司 | Component type inverter wiring detection method, device and system |
| CN108583322A (en) * | 2018-04-18 | 2018-09-28 | 南京越博动力系统股份有限公司 | The anti-reverse method of new-energy automobile five in one controller and its device |
| CN110829405B (en) * | 2018-08-14 | 2021-11-16 | 维谛技术有限公司 | Reverse connection prevention protection circuit and communication power supply equipment |
| CN110970918B (en) * | 2018-09-30 | 2022-09-13 | 浙江英达威芯电子有限公司 | Photovoltaic module control system and method and photovoltaic system |
| CN110749771B (en) * | 2019-10-15 | 2022-03-18 | 宁波吉利汽车研究开发有限公司 | Current acquisition system, current acquisition device and electric automobile |
| CN110671787A (en) * | 2019-10-18 | 2020-01-10 | 珠海格力电器股份有限公司 | Protection device, air conditioning system and protection method thereof |
| CN112003261B (en) * | 2020-09-18 | 2024-01-23 | 东莞新能安科技有限公司 | Reverse connection preventing protection circuit, reverse connection preventing protection method and electrochemical device |
| CN112510670B (en) * | 2020-11-13 | 2022-08-09 | 华为数字能源技术有限公司 | Power reverse connection preventing circuit, power distribution device and power supply and distribution system |
| CN114450865A (en) | 2020-11-13 | 2022-05-06 | 华为数字能源技术有限公司 | Power reverse connection preventing circuit, power distribution device and power supply and distribution system |
| CN112596000A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Method and device for detecting reverse connection of PV input ends of photovoltaic inverters |
| CN216959322U (en) * | 2022-02-11 | 2022-07-12 | Oppo广东移动通信有限公司 | Electric spark eliminating circuit, power adapter and electronic equipment |
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| CN103545804A (en) | 2014-01-29 |
| WO2015010528A1 (en) | 2015-01-29 |
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