CN203481819U - DC input terminal anti-reverse-connection protection circuit and DC input equipment - Google Patents
DC input terminal anti-reverse-connection protection circuit and DC input equipment Download PDFInfo
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- CN203481819U CN203481819U CN201320442714.9U CN201320442714U CN203481819U CN 203481819 U CN203481819 U CN 203481819U CN 201320442714 U CN201320442714 U CN 201320442714U CN 203481819 U CN203481819 U CN 203481819U
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Abstract
The utility model provides a DC input terminal anti-reverse-connection protection circuit, which comprises a controllable disconnection accessory, a voltage detection unit and a control unit. The controllable disconnection accessory is connected between the DC input terminal and a post-stage circuit. The voltage detection unit is connected in parallel with the positive electrode and the negative electrode of the DC input terminal and is used for detecting voltage signals between the positive electrode and the negative electrode of the DC input terminal in real time and then transmitting the detection result to the control unit. The control unit is respectively connected with the voltage detection unit and the controllable disconnection accessory and is used for judging whether the positive electrode and the negative electrode of the DC input terminal are in reverse connection or not according to the detection result of the voltage detection unit. If the positive electrode and the negative electrode of the DC input terminal are in reverse connection, the controllable disconnection accessory is controlled to be disconnected by means of the control unit. If the positive electrode and the negative electrode of the DC input terminal are in forward connection, the controllable disconnection accessory is controlled to be connected by means of the control unit. Correspondingly, the utility model provides DC input equipment. Compared with the prior art, the cost is lowered, while the power consumption of the system is reduced at the same time.
Description
Technical field
The utility model relates to the anti-reverse resist technology of direct-flow input end field, is specifically related to a kind of direct-flow input end reverse connection prevention protection circuit and direct current input equipment.
Background technology
In grid-connected photovoltaic system; the direct-flow input end of inverter is directly connected with the output of solar panel; when the direct-flow input end reversal connection of inverter; its direct-flow input end is short-circuited the switching tube short circuit by inverter; can damage switching tube; even breaking out of fire, so have requirement to the reverse connecting protection of its direct-flow input end in inverter in relevant criterion.
In order to prevent the reversal connection of inverter direct-flow input end, as shown in Figure 1, prior art generally can arrange diode at its direct-flow input end, to utilize the unilateal conduction performance of diode to protect inverter (being late-class circuit).But diode in inverter course of normal operation, can continue conducting and long-time in have electric current to pass through, thereby caused lasting loss, from secure context, consider that the type selecting of diode and heat radiation are had to higher requirement, cost is higher.Can find out, the above-mentioned scheme that diode is set at direct-flow input end has increased larger cost on the one hand, can increase system power dissipation on the other hand when inverter normally moves, and reduces system effectiveness.
Utility model content
Technical problem to be solved in the utility model is that providing a kind of can reduce costs for existing above-mentioned defect in prior art, can reduce again direct-flow input end reverse connection prevention protection circuit and the direct current input equipment of system power dissipation.
Solve the technical scheme that the utility model technical problem adopts:
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 detecting in real time the voltage signal between direct-flow input end both positive and negative polarity, and testing result is sent to control unit;
Described control unit is connected with controlled disconnection annex with voltage detection unit respectively, for judge the whether reversal connection of direct-flow input end both positive and negative polarity according to the testing result of voltage detection unit, if judge reversal connection, control controlled disconnection annex and disconnect, if judge and just connect, control the adhesive of controlled disconnection annex.
Preferably, described control unit specifically for:
After direct-flow input end reverse connection prevention protection circuit powers on,
If the testing result of described voltage detection unit is the voltage between direct-flow input end both positive and negative polarity is negative pressure, judges the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection;
If the testing result of described voltage detection unit is the voltage between direct-flow input end both positive and negative polarity is malleation, judges that direct-flow input end both positive and negative polarity just connects, and control the adhesive of controlled disconnection annex.
Preferably, in described control unit, be preset with negative pressure normal value, for the testing result at voltage detection unit, be also voltage between direct-flow input end both positive and negative polarity while being negative pressure, obtain this negative pressure value, judge whether described negative pressure value has more 0～50% than described negative pressure normal value, in this way, judge the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection, as no, judge that direct-flow input end both positive and negative polarity just connects, and control the adhesive of controlled disconnection annex.
Preferably, described control unit also for: before direct-flow input end reverse connection prevention protection circuit powers on, control controlled disconnection annex and disconnect.
Preferably, described control unit comprises the first sample circuit and the first comparison circuit;
Described the first sample circuit is sampled for the voltage signal that voltage detection unit is detected in real time, to obtain voltage sampling signal, and described voltage sampling signal is sent to the first comparison circuit;
In described the first comparison circuit, be preset with voltage reference and oppositely judge signal, for described voltage sampling signal and described voltage reference are oppositely judged to signal compares, if being greater than described voltage reference, described voltage sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and export corresponding digital signal level and drive controlled disconnection annex to disconnect; If described voltage sampling signal is less than or equal to described voltage reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level and drive the adhesive of controlled disconnection annex.
Preferably, described direct-flow input end reverse connection prevention protection circuit also comprises current detecting unit, described current detecting unit is connected between controlled disconnection annex and late-class circuit, for detecting in real time the current signal of 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 after controlling the adhesive of controlled disconnection annex, according to the testing result of current detecting unit, further judge the whether reversal connection of direct-flow input end both positive and negative polarity, if judgement reversal connection, controlling controlled disconnection annex disconnects, if judge and just connect, control controlled disconnection annex and keep adhesive.
Preferably, described control unit specifically for: after controlling the adhesive of controlled disconnection annex,
If the flow direction that the testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit is oppositely, judges the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection;
If the flow direction that the testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit is forward, judges that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection annex maintenance adhesive.
Preferably; in described control unit, be preset with reverse current normal value; when the flow direction that is also direct-flow input end reverse connection prevention protection circuit electric current for the testing result at current detecting unit is reverse; obtain this reverse current value; judge whether described reverse current value has more 0～50% than described reverse current normal value; in this way; judge the reversal connection of direct-flow input end both positive and negative polarity; and control controlled disconnection annex and disconnect; as no; judge that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection annex maintenance adhesive.
Preferably, described control unit comprises the second sample circuit and the second comparison circuit;
Described the second sample circuit is sampled for the current signal that current detecting unit is detected in real time, to draw current sampling signal, and described current sampling signal is sent to the second comparison circuit;
In described the second comparison circuit, be preset with current reference and oppositely judge signal, for described current sampling signal and described current reference are oppositely judged to signal compares, if being greater than described current reference, described current sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and export corresponding digital signal level and drive controlled disconnection annex to disconnect; If described current sampling signal is less than or equal to described current reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level and drive controlled disconnection annex to keep adhesive.
Preferably, described controlled disconnection annex adopts any in controllable relays, contactor, release.
The utility model also provides a kind of direct current input equipment that comprises above-mentioned direct-flow input end reverse connection prevention protection circuit.
Beneficial effect:
1) direct-flow input end reverse connection prevention protection circuit described in the utility model is by voltage detection unit, controlled disconnection annex and control unit wherein; just can judge the whether reversal connection of direct-flow input end both positive and negative polarity; and when judging reversal connection, control controlled disconnection annex and disconnect; the late-class circuit being connected with direct-flow input end place circuit with protection; compare with the scheme that at direct-flow input end diode is set in prior art; cost is lower, and can not increase the power consumption of system.
2) in direct-flow input end reverse connection prevention protection circuit described in the utility model, also there is current detecting unit, further to judge the whether reversal connection of direct-flow input end both positive and negative polarity, thereby played double protection, improved the reliability of system.
3) direct-flow input end reverse connection prevention protection circuit described in the utility model is simple in structure, easy to implement.
Accompanying drawing explanation
Fig. 1 is the structural representation of direct-flow input end reverse connection prevention protection circuit described in prior art;
Fig. 2 is the structural representation of direct-flow input end reverse connection prevention protection circuit described in the utility model embodiment 1;
Fig. 3 is the flow chart of the anti-reverse guard method of direct-flow input end described in the utility model embodiment 1;
Fig. 4 is the workflow diagram of direct-flow input end reverse connection prevention protection circuit described in the utility model embodiment 2;
Fig. 5 is the flow chart of the anti-reverse guard method of direct-flow input end described in the utility model embodiment 2;
Fig. 6 is the flow chart of the anti-reverse guard method of direct-flow input end described in the utility model embodiment 3;
Fig. 7 is the structural representation of direct-flow input end reverse connection prevention protection circuit described in the utility model embodiment 4;
Fig. 8 is the workflow diagram of direct-flow input end reverse connection prevention protection circuit described in the utility model embodiment 4;
Fig. 9 is the flow chart of the anti-reverse guard method of direct-flow input end described in the utility model embodiment 4;
Figure 10 is the flow chart of the anti-reverse guard method of direct-flow input end described in the utility model embodiment 5.
Embodiment
For making those skilled in the art understand better the technical solution of the utility model, below in conjunction with drawings and Examples, direct-flow input end reverse connection prevention protection circuit described in the utility model and direct current input equipment are described in further detail.
Embodiment 1:
As shown in Figure 2, the present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit, and it comprises: 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 detecting in real time the voltage signal between direct-flow input end both positive and negative polarity, and testing result is sent to control unit.
Described control unit is connected with controlled disconnection annex with voltage detection unit respectively; for judge the whether reversal connection of direct-flow input end both positive and negative polarity according to the testing result of voltage detection unit; if judgement reversal connection; controlling controlled disconnection annex disconnects; with protection late-class circuit, prevent that it is impaired, if judge, just connect; control the adhesive of controlled disconnection annex, to guarantee that late-class circuit normally moves.
Described control unit can adopt the logic control devices such as existing single-chip microcomputer, DSP (digital signal processor).
At control unit, judge after the reversal connection of direct-flow input end both positive and negative polarity, need transposing direct current input wires terminal, then by control unit, according to the testing result of voltage detection unit, continue to judge the whether reversal connection of direct-flow input end both positive and negative polarity.
Preferably, described controlled disconnection annex adopts any in controllable relays, contactor, release.Except automatically being controlled controlled disconnection annex disconnection or adhesive according to its result of determination by control unit, also can point out staff, by staff, manually control controlled disconnection annex and disconnect or adhesive.
The present embodiment also provides a kind of direct current input equipment, and it comprises 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 guard method, comprises the steps:
S101. detect in real time the voltage signal between direct-flow input end both positive and negative polarity.
S102. according to the testing result of step s101, judge the whether reversal connection of direct-flow input end both positive and negative polarity, if judge reversal connection, make direct-flow input end place circuit and late-class circuit disconnect, if judgement just connects, make direct-flow input end place circuit be communicated with late-class circuit.
Embodiment 2:
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation is identical with Fig. 2), wherein, described control unit specifically for:
After direct-flow input end reverse connection prevention protection circuit powers on,
If the testing result of described voltage detection unit is the voltage between direct-flow input end both positive and negative polarity is negative pressure, judges the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection;
If the testing result of described voltage detection unit is the voltage between direct-flow input end both positive and negative polarity is malleation, judges that direct-flow input end both positive and negative polarity just connects, and control the adhesive of controlled disconnection annex.
Described control unit can adopt the logic control devices such as existing single-chip microcomputer, DSP (digital signal processor).
It should be noted that, the testing result of described voltage detection unit comprises: the voltage signal between the direct-flow input end both positive and negative polarity detecting in real time, and the conclusion that can directly draw according to described voltage signal, for example the voltage between direct-flow input end both positive and negative polarity is malleation or negative pressure.
May there is certain error in the voltage signal detecting due to voltage detection unit, drift or fluctuation, disconnected in order to prevent erroneous judgement, preferably, in described control unit, be preset with negative pressure normal value, for the testing result at voltage detection unit, be also that voltage between direct-flow input end both positive and negative polarity is while being negative pressure, obtain this negative pressure value, judge that whether described negative pressure value has more 0～50% (for example 10%) than described negative pressure normal value, in this way, judge the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex and disconnect, as no, judge that direct-flow input end both positive and negative polarity just connects, and control the adhesive of controlled disconnection annex.That is to say, even if the testing result of voltage detection unit is negative pressure, also not necessarily judge the reversal connection of direct-flow input end both positive and negative polarity, for example, when this negative pressure value does not exceed the number range of regulation, judge that direct-flow input end both positive and negative polarity just connects.Described negative pressure normal value can be set according to the voltage condition between direct-flow input end both positive and negative polarity voluntarily by those skilled in the art, and described negative pressure normal value can be a number range, can be also 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 direct-flow input end reverse connection prevention protection circuit power on.
S202. by voltage detection unit, detect in real time the voltage signal between direct-flow input end both positive and negative polarity, if the testing result of voltage detection unit is negative pressure, perform step s203, if the testing result of voltage detection unit is malleation, perform step s206.
S203. in control unit, preset negative is pressed normal value, judges whether described negative pressure value has more 10% than described negative pressure normal value, in this way, performs step s204, as no, performs step s206.
S204. control unit is judged the reversal connection of direct-flow input end both positive and negative polarity, and controls controlled disconnection annex disconnection.
S205. change 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 the adhesive of controlled disconnection annex.
It should be noted that, in such scheme, before direct-flow input end reverse connection prevention protection circuit powers on, control unit is not known the state of controlled disconnection annex, and controlled disconnection annex may be in off-state, also may be in attracting state, if controlled disconnection annex is in off-state, and the reversal connection of direct-flow input end both positive and negative polarity, the testing result one of voltage detection unit is decided to be negative pressure, if direct-flow input end both positive and negative polarity just connects, the testing result one of voltage detection unit is decided to be malleation; And if controlled disconnection annex is in attracting state, no matter whether reversal connection of direct-flow input end both positive and negative polarity, the testing result of voltage detection unit is malleation.Therefore there is the disconnected possibility of erroneous judgement in control unit.
The present embodiment also provides a kind of direct current input equipment, and it comprises 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 guard method, comprises the steps:
S301. detect in real time the voltage signal between direct-flow input end both positive and negative polarity.
S302, after direct-flow input end place circuit powers on,
If the testing result of step s301 is that between direct-flow input end both positive and negative polarity, voltage is negative pressure, judges the reversal connection of direct-flow input end both positive and negative polarity, and direct-flow input end place circuit and late-class circuit are disconnected;
If the testing result of step s301 is that between direct-flow input end both positive and negative polarity, voltage is malleation, judges that direct-flow input end both positive and negative polarity just connects, and direct-flow input end place circuit is communicated with late-class circuit.
It should be noted that, the testing result of described step s301 comprises: the voltage signal between the direct-flow input end both positive and negative polarity detecting in real time, and the conclusion that can directly draw according to described voltage signal, for example the voltage between direct-flow input end both positive and negative polarity is malleation or negative pressure.
Because the voltage signal detecting may exist certain error, drift or fluctuation, disconnected in order to prevent erroneous judgement, preferably, described step s302 also comprises:
Preset negative is pressed normal value;
In described testing result, be that voltage between direct-flow input end both positive and negative polarity is while being negative pressure, obtain this negative pressure value, judge whether described negative pressure value has more 0～50% than described negative pressure normal value, in this way, judge the reversal connection of direct-flow input end both positive and negative polarity, and direct-flow input end place circuit and late-class circuit are disconnected, as no, judge that direct-flow input end both positive and negative polarity just connects, and direct-flow input end place circuit is communicated with late-class circuit.
Other structures in the present embodiment, method and effect are all identical with embodiment 1, repeat no more here.
Embodiment 3:
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation is identical with Fig. 2); wherein; described control unit comprises the first sample circuit and the first comparison circuit; be that control unit does not need to adopt the logic control device described in embodiment 1～2, only need to adopt a hardware circuit can control the adhesive/disconnection of controlled disconnection annex.
Described the first sample circuit is sampled for the voltage signal that voltage detection unit is detected in real time, to obtain voltage sampling signal, and described voltage sampling signal is sent to the first comparison circuit.
In described the first comparison circuit, be preset with voltage reference and oppositely judge signal, for described voltage sampling signal and described voltage reference are oppositely judged to signal compares, if being greater than described voltage reference, described voltage sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and export corresponding digital signal level and drive controlled disconnection annex to disconnect; If described voltage sampling signal is less than or equal to described voltage reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level and drive the adhesive of controlled disconnection annex.Described voltage reference oppositely judges that signal can be by those skilled in the art according to the voltage condition designed, designed between direct-flow input end both positive and negative polarity.Described digital signal level can be high level signal or low level signal, for example, when described the first comparison circuit is exported high level signal, drives controlled disconnection annex to disconnect, and during output low level signal, drives the adhesive of controlled disconnection annex; Vice versa.
The present embodiment also provides a kind of direct current input equipment, and it comprises late-class circuit and above-mentioned direct-flow input end reverse connection prevention protection circuit.
As shown in Figure 6, the present embodiment also provides a kind of direct-flow input end anti-reverse guard method, comprises the steps:
S401. detect in real time the voltage signal between 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 sampled, to obtain voltage sampling signal;
Predeterminated voltage benchmark oppositely judges signal;
Described voltage sampling signal and described voltage reference are oppositely judged to signal compares, if being greater than described voltage reference, described voltage sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and direct-flow input end place circuit and late-class circuit are disconnected; If described voltage sampling signal is less than or equal to described voltage reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and direct-flow input end place circuit is communicated with late-class circuit.
Other structures in the present embodiment, method and effect are all identical with embodiment 1, repeat no more here.
Embodiment 4:
As shown in Figure 7, the present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit, and the difference of circuit is described in itself and embodiment 2,
Described direct-flow input end reverse connection prevention protection circuit also comprises current detecting unit, described current detecting unit is connected between controlled disconnection annex and late-class circuit, for detecting in real time the current signal of 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 after controlling the adhesive of controlled disconnection annex, according to the testing result of current detecting unit, further judge the whether reversal connection of direct-flow input end both positive and negative polarity, if judgement reversal connection, controlling controlled disconnection annex disconnects, if judge and just connect, control controlled disconnection annex and keep adhesive.
Preferably, described control unit specifically for: after controlling the adhesive of controlled disconnection annex, if the flow direction that the testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit is oppositely, judges the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection;
If the flow direction that the testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit is forward, judges that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection annex maintenance adhesive.
It should be noted that, described testing result is for oppositely referring to, and in direct-flow input end reverse connection prevention protection circuit, sense of current is with sense of current is contrary under normal circumstances; Described testing result is that forward refers to, and in direct-flow input end reverse connection prevention protection circuit, sense of current is with sense of current is identical under normal circumstances.
The testing result of described current detecting unit comprises: the current signal in the direct-flow input end reverse connection prevention protection circuit detecting in real time; and the conclusion that can directly draw according to described current signal, for example in direct-flow input end reverse connection prevention protection circuit, the flow direction of electric current is forward or reverse.
May there is certain error in the current signal detecting due to current detecting unit, drift or fluctuation, disconnected in order to prevent erroneous judgement, preferably, in described control unit, be preset with reverse current normal value, when the flow direction that is also direct-flow input end reverse connection prevention protection circuit electric current for the testing result at current detecting unit is reverse, obtain this reverse current value, judge that whether described reverse current value has more 0～50% (for example 10%) than described reverse current normal value, in this way, judge the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex and disconnect, as no, judge that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection annex and keep adhesive.That is to say, even if the testing result of current detecting unit is oppositely, also not necessarily judge the reversal connection of direct-flow input end both positive and negative polarity, for example, when this reverse current value does not exceed the number range of regulation, judge that direct-flow input end both positive and negative polarity just connects.Described reverse current normal value can be set according to the situation of electric current in direct-flow input end reverse connection prevention protection circuit voluntarily by those skilled in the art, and described reverse current normal value can be a number range, can be also 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. by current detecting unit, detect in real time the current signal in direct-flow input end reverse connection prevention protection circuit, if the testing result of current detecting unit is oppositely, perform step s508, if the testing result of current detecting unit is forward, perform step s511.
S508. default reverse current normal value in control unit, judges whether described reverse current value has more 10% than described reverse current normal value, in this way, performs step s509, as no, performs step s511.
S509. control unit is judged the reversal connection of direct-flow input end both positive and negative polarity, and controls controlled disconnection annex disconnection.
S510. change 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 maintenance adhesive.
Visible, the present embodiment is owing to having increased current detecting unit, before direct-flow input end reverse connection prevention protection circuit powers on, if controlled disconnection annex is in off-state, according to the testing result of voltage detection unit, just can judge the whether reversal connection of direct-flow input end both positive and negative polarity, and current detecting unit is further judged the whether reversal connection of direct-flow input end both positive and negative polarity, has played the effect of duplicate protection; If controlled disconnection annex is in attracting state, according to 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 further can direct-flow input end both positive and negative polarity whether reversal connection, therefore current detecting unit has overcome control unit and has judged disconnected defect by accident, has improved the reliability of circuit.
The present embodiment also provides a kind of direct current input equipment, and it comprises 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 guard method, comprises the steps:
S601-s602 is identical with the s301-s302 in embodiment 2, repeats no more.
S603. detect in real time the current signal in the circuit of direct-flow input end place;
S604. after direct-flow input end place circuit is communicated with late-class circuit, according to the testing result of step s603, further judge the whether reversal connection of direct-flow input end both positive and negative polarity, if judgement reversal connection, make direct-flow input end place circuit and late-class circuit disconnect, if judge and just connect, make direct-flow input end place circuit and late-class circuit keep being communicated with.
Preferably, described step s604 is specially:
After direct-flow input end place circuit is communicated with late-class circuit,
If the flow direction that described testing result is electric current in the circuit of direct-flow input end place is oppositely, judges the reversal connection of direct-flow input end both positive and negative polarity, and direct-flow input end place circuit and late-class circuit are disconnected;
If described testing result is the flow direction of electric current in the circuit of direct-flow input end place is forward, judges that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and late-class circuit keep being communicated with.
It should be noted that, the testing result of described step s603 comprises: the current signal in the direct-flow input end place circuit detecting in real time, and the conclusion that can directly draw according to described current signal, for example in the circuit of direct-flow input end place, the flow direction of electric current is forward or reverse.
Because the current signal detecting may exist certain error, drift or fluctuation, disconnected in order to prevent erroneous judgement, preferably, described step s604 also comprises:
Default reverse current normal value;
When the flow direction that is electric current in the circuit of direct-flow input end place in described testing result is reverse, obtain this reverse current value, judge whether described reverse current value has more 0～50% than described reverse current normal value, in this way, judge the reversal connection of direct-flow input end both positive and negative polarity, and direct-flow input end place circuit and late-class circuit are disconnected, as no, judge that direct-flow input end both positive and negative polarity just connects, and make direct-flow input end place circuit and late-class circuit keep being communicated with.
Other structures in the present embodiment, method and effect are all identical with embodiment 2, repeat no more here.
Embodiment 5:
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation is identical with Fig. 7), and wherein, described control unit comprises the second sample circuit and the second comparison circuit.
Described the second sample circuit is sampled for the current signal that current detecting unit is detected in real time, to draw current sampling signal, and described current sampling signal is sent to the second comparison circuit.
In described the second comparison circuit, be preset with current reference and oppositely judge signal, for described current sampling signal and described current reference are oppositely judged to signal compares, if being greater than described current reference, described current sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and export corresponding digital signal level and drive controlled disconnection annex to disconnect; If described current sampling signal is less than or equal to described current reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level and drive controlled disconnection annex to keep adhesive.Described current reference oppositely judges that signal can be by those skilled in the art according to the current conditions designed, designed in direct-flow input end reverse connection prevention protection circuit.Described digital signal level can be high level signal or low level signal, for example, when described the second comparison circuit is exported high level signal, drives controlled disconnection annex to disconnect, and during output low level signal, drives the adhesive of controlled disconnection annex; Vice versa.
The present embodiment also provides a kind of direct current input equipment, and it comprises 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 guard method, comprises the steps:
S701-s703 is identical with the s601-s603 in embodiment 4, repeats no more.
S704. the current signal in the direct-flow input end place circuit of real-time detection is sampled, to draw current sampling signal;
Predetermined current benchmark oppositely judges signal;
Described current sampling signal and described current reference are oppositely judged to signal compares, if being greater than described current reference, described current sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and direct-flow input end place circuit and late-class circuit are disconnected; If described current sampling signal is less than or equal to described current reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and direct-flow input end place circuit is communicated with late-class circuit.
Other structures in the present embodiment, method and effect are all identical with embodiment 4, repeat no more here.
Embodiment 6:
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation is identical with Fig. 2), and the difference of circuit is described in itself and embodiment 2,
Described control unit also for: before direct-flow input end reverse connection prevention protection circuit powers on, control controlled disconnection annex and disconnect.
Visible; the present embodiment is owing to before powering at direct-flow input end reverse connection prevention protection circuit, controlled disconnection annex being forced to disconnect; therefore; if the reversal connection of direct-flow input end both positive and negative polarity, the testing result one of voltage detection unit is decided to be negative pressure, if direct-flow input end both positive and negative polarity just connects; the testing result one of voltage detection unit is decided to be malleation; compare with circuit described in embodiment 2, overcome control unit and judged disconnected defect by accident, improved the reliability of circuit.
The present embodiment also provides a kind of direct current input equipment, and it comprises 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, and the difference of method is described in itself and embodiment 2,
Described step s302 also comprises: before direct-flow input end place circuit powers on, direct-flow input end place circuit and late-class circuit are disconnected.
Other structures in the present embodiment, method and effect are all identical with embodiment 2, repeat no more here.
Embodiment 7:
The present embodiment provides a kind of direct-flow input end reverse connection prevention protection circuit (structural representation is identical with Fig. 7), and the difference of circuit is described in itself and embodiment 4,
Described control unit also for: before direct-flow input end reverse connection prevention protection circuit powers on, control controlled disconnection annex and disconnect.
In the present embodiment; owing to before powering at direct-flow input end reverse connection prevention protection circuit, controlled disconnection annex being forced to disconnect; therefore just can judge the whether reversal connection of direct-flow input end both positive and negative polarity according to the testing result of voltage detection unit; and adopt current detecting unit, be in order further to judge the whether reversal connection of direct-flow input end both positive and negative polarity, thereby play the effect of duplicate protection.
The present embodiment also provides a kind of direct current input equipment, and it comprises 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, and the difference of method is described in itself and embodiment 3,
Described step s602 also comprises: before direct-flow input end place circuit powers on, direct-flow input end place circuit and late-class circuit are disconnected.
Other structures in the present embodiment, method and effect are all identical with embodiment 4, repeat no more here.
Be understandable that, above execution mode is only used to principle of the present utility model is described and the illustrative embodiments that adopts, yet the utility model is not limited to this.For those skilled in the art, in the situation that not departing from spirit of the present utility model and essence, can make various modification and improvement, these modification and improvement are also considered as protection range of the present utility model.
Claims (11)
1. a direct-flow input end reverse connection prevention protection circuit, is characterized in that, comprising: 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 detecting in real time the voltage signal between direct-flow input end both positive and negative polarity, and testing result is sent to control unit;
Described control unit is connected with controlled disconnection annex with voltage detection unit respectively, for judge the whether reversal connection of direct-flow input end both positive and negative polarity according to the testing result of voltage detection unit, if judge reversal connection, control controlled disconnection annex and disconnect, if judge and just connect, control the adhesive of controlled disconnection annex.
2. circuit according to claim 1, is characterized in that, described control unit specifically for:
After direct-flow input end reverse connection prevention protection circuit powers on,
If the testing result of described voltage detection unit is the voltage between direct-flow input end both positive and negative polarity is negative pressure, judges the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection;
If the testing result of described voltage detection unit is the voltage between direct-flow input end both positive and negative polarity is malleation, judges that direct-flow input end both positive and negative polarity just connects, and control the adhesive of controlled disconnection annex.
3. circuit according to claim 2, it is characterized in that, in described control unit, be preset with negative pressure normal value, for the testing result at voltage detection unit, be also that voltage between direct-flow input end both positive and negative polarity is while being negative pressure, obtain this negative pressure value, judge whether described negative pressure value has more 0～50% than described negative pressure normal value, in this way, judge the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex and disconnect, as no, judge that direct-flow input end both positive and negative polarity just connects, and control the adhesive of controlled disconnection annex.
4. circuit according to claim 2, is characterized in that, described control unit also for: before direct-flow input end reverse connection prevention protection circuit powers on, control controlled disconnection annex and disconnect.
5. circuit according to claim 1, is characterized in that,
Described control unit comprises the first sample circuit and the first comparison circuit;
Described the first sample circuit is sampled for the voltage signal that voltage detection unit is detected in real time, to obtain voltage sampling signal, and described voltage sampling signal is sent to the first comparison circuit;
In described the first comparison circuit, be preset with voltage reference and oppositely judge signal, for described voltage sampling signal and described voltage reference are oppositely judged to signal compares, if being greater than described voltage reference, described voltage sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and export corresponding digital signal level and drive controlled disconnection annex to disconnect; If described voltage sampling signal is less than or equal to described voltage reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level and drive the adhesive of controlled disconnection annex.
6. according to the circuit described in any one in claim 2-5, it is characterized in that,
Described direct-flow input end reverse connection prevention protection circuit also comprises current detecting unit, described current detecting unit is connected between controlled disconnection annex and late-class circuit, for detecting in real time the current signal of 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 after controlling the adhesive of controlled disconnection annex, according to the testing result of current detecting unit, further judge the whether reversal connection of direct-flow input end both positive and negative polarity, if judgement reversal connection, controlling controlled disconnection annex disconnects, if judge and just connect, control controlled disconnection annex and keep adhesive.
7. circuit according to claim 6, is characterized in that, described control unit specifically for: after controlling the adhesive of controlled disconnection annex,
If the flow direction that the testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit is oppositely, judges the reversal connection of direct-flow input end both positive and negative polarity, and control controlled disconnection annex disconnection;
If the flow direction that the testing result of current detecting unit is electric current in direct-flow input end reverse connection prevention protection circuit is forward, judges that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection annex maintenance adhesive.
8. circuit according to claim 7; it is characterized in that; in described control unit, be preset with reverse current normal value; when the flow direction that is also direct-flow input end reverse connection prevention protection circuit electric current for the testing result at current detecting unit is reverse; obtain this reverse current value; judge whether described reverse current value has more 0～50% than described reverse current normal value; in this way; judge the reversal connection of direct-flow input end both positive and negative polarity; and control controlled disconnection annex and disconnect; as no, judge that direct-flow input end both positive and negative polarity just connects, and control controlled disconnection annex maintenance adhesive.
9. circuit according to claim 6, is characterized in that,
Described control unit comprises the second sample circuit and the second comparison circuit;
Described the second sample circuit is sampled for the current signal that current detecting unit is detected in real time, to draw current sampling signal, and described current sampling signal is sent to the second comparison circuit;
In described the second comparison circuit, be preset with current reference and oppositely judge signal, for described current sampling signal and described current reference are oppositely judged to signal compares, if being greater than described current reference, described current sampling signal oppositely judges signal, judge the reversal connection of direct-flow input end both positive and negative polarity, and export corresponding digital signal level and drive controlled disconnection annex to disconnect; If described current sampling signal is less than or equal to described current reference, oppositely judge signal, judge that direct-flow input end both positive and negative polarity just connects, and export corresponding digital signal level and drive controlled disconnection annex to keep adhesive.
10. circuit according to claim 1, is characterized in that, described controlled disconnection annex adopts any in controllable relays, contactor, release.
11. 1 kinds of direct current input equipments, is characterized in that, comprise the direct-flow input end reverse connection prevention protection circuit as described in any one in claim 1-10.
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| CN201320442714.9U CN203481819U (en) | 2013-07-23 | 2013-07-23 | DC input terminal anti-reverse-connection protection circuit and DC input equipment |
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| CN201320442714.9U CN203481819U (en) | 2013-07-23 | 2013-07-23 | DC input terminal anti-reverse-connection protection circuit and DC input equipment |
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