CN102611079B - Short-circuit protection system and short-circuit protection method for isolated power converter - Google Patents
Short-circuit protection system and short-circuit protection method for isolated power converter Download PDFInfo
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- CN102611079B CN102611079B CN201210064802.XA CN201210064802A CN102611079B CN 102611079 B CN102611079 B CN 102611079B CN 201210064802 A CN201210064802 A CN 201210064802A CN 102611079 B CN102611079 B CN 102611079B
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Abstract
The embodiment of the invention discloses a short-circuit protection system and a short-circuit protection method for an isolated power converter, which relate to the field of electronic circuits and can quickly protect the isolated power converter when a load on the isolated power converter is in short circuit, and greatly improve the reliability of the isolated power converter. According to the short-circuit protection system of the isolated power converter, the isolated power converter comprises an input source, an electronic switch, and a transformer connected with the input source through the electronic switch. The short-circuit protection system for the isolated power converter comprises a short circuit detection module for transmitting a short circuit signal to a control module when detecting that the load of the isolated power converter is in short circuit, and the control module for protecting the isolated power converter according to the short circuit signal when receiving the short circuit signal from the short circuit detection module.
Description
Technical field
The present invention relates to electronic circuit field, particularly relate to a kind of short circuit protection system and method for isolated power converters.
Background technology
The feature of isolated power converters between its input circuit and output circuit, to provide electric current to isolate, that is, there is not the current path allowing electric current to flow to outlet side from the input side of isolated power converters.Usually, isolated power converters comprises the energy transfer element of such as transformer etc., the input side of isolated power converters and outlet side electric current to be isolated.
Inventor is realizing finding in process of the present invention, and when the load circuit short circuit of the outlet side of isolated power converters, the electronic switch of the input of isolated power converters is easily punctured by the big current flow through instantaneously and damages.
Summary of the invention
Technical problem to be solved by this invention is the short circuit protection system and the method that provide a kind of isolated power converters; when can realize the load circuit short circuit when isolated power converters; rapid realization is protected described isolated power converters, substantially increases the reliability of described isolated power converters.
For solving the problems of the technologies described above, the short circuit protection system of isolated power converters of the present invention and method adopt following technical scheme:
A kind of short circuit protection system of isolated power converters; described isolated power converters comprises: input source, electronic switch and the transformer be connected with described input source by described electronic switch, and the short circuit protection system of described isolated power converters comprises:
Short-circuit detecting module, for when the load circuit short circuit of described isolated power converters being detected, sends short-circuit signal to control module;
Control module, when receiving the short-circuit signal from described short-circuit detecting module, controls the connection that described electronic switch disconnects described transformer and described input source.
A short-circuit protection method for isolated power converters, described isolated power converters comprises: input source, electronic switch and the transformer be connected with described input source by described electronic switch, and described method comprises:
When short-circuit detecting module detects the load circuit short circuit of described isolated power converters, send short-circuit signal to control module;
When control module receives the short-circuit signal from described short-circuit detecting module, control the connection that described electronic switch disconnects described transformer and described input source.
In the technical scheme of the present embodiment, provide a kind of short circuit protection system of isolated power converters, the short circuit protection system of this isolated power converters comprises: short-circuit detecting module and control module.When the load circuit short circuit of described isolated power converters, short-circuit detecting module can detect rapidly the load circuit short circuit of described isolated power converters, and send short-circuit signal to described control module, after described control module receives short-circuit signal, described electronic switch can be controlled immediately and disconnect connection between described input source and transformer, rapid realization is protected described isolated power converters, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously and lost efficacy, reduce the maintenance cost of isolated power converters.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the short circuit protection system structural representation of isolated power converters in the embodiment of the present invention;
Fig. 2 is transformer device structure schematic diagram in prior art;
Fig. 3 is short circuit detection module structural representation one in the embodiment of the present invention;
Fig. 4 is short circuit detection module structural representation two in the embodiment of the present invention;
Fig. 5 is the short-circuit protection method flow chart of isolated power converters in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The embodiment of the present invention provides a kind of short circuit protection system of isolated power converters; as shown in Figure 1; described isolated power converters comprises: input source 100, electronic switch 101 and the transformer 102 be connected with described input source 100 by described electronic switch 101, and the short circuit protection system of described isolated power converters comprises:
Short-circuit detecting module 200, for when load circuit 103 short circuit of described isolated power converters being detected, sends short-circuit signal to control module 201;
Control module 201, when receiving the short-circuit signal from described short-circuit detecting module 200, controls the connection that described electronic switch 101 disconnects described transformer 102 and described input source 100.
Isolated power converters realizes electric current between the input side of isolated power converters and outlet side to isolate by transformer 102, and between input side and outlet side transferring energy.
Transformer 102 is the devices utilizing electromagnetic induction principle electric energy transmitting or the signal of telecommunication, and it has the effect of transformation, unsteady flow and impedance.The kind of transformer 102 is a lot, applies very extensive.Carry out long distance power transmission after such as the voltage that generator sends being raised with power transformer 102 in electric power system, with transformer 102, voltage is reduced so that user uses again after arriving destination, reduce the loss of electric energy in transmitting procedure with this; In electronic equipment and instrument, conventional small-power input source transformer 102 changes line voltage, then by rectification and filtering, obtains the direct voltage required for circuit; With transformer 102 transmission of signal or the coupling of carrying out impedance etc. of coupling in amplifying circuit.
As shown in Figure 2, the critical piece of transformer 102 is an iron core 1020 and two windings be enclosed within iron core, and winding is the circuit of transformer 102, generally forms with insulated copper wire or aluminum steel (lenticular wire or circle line) coiling.The winding be connected with input source 100 in transformer 102 is primary winding 1021, the side being provided with primary winding 1021 is called former limit, be connected with load circuit 103 and provide the winding of the energy to be auxiliary winding 1022 to load circuit 103, the side being provided with auxiliary winding 1022 is called secondary.Wherein, between primary winding 1021 and auxiliary winding 1022, only have magnetic coupling, be not electrically connected.
When transformer 102 works, alternating voltage is inputted at primary winding 1021, produce the alternating flux of interlinkage primary winding 1021 and auxiliary winding 1022, the alternating flux of conversion changes into and exports with the output voltage of the input voltage same frequency on primary winding 1021 by auxiliary winding 1022.
Wherein, the ratio of the both end voltage of auxiliary winding 1022 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, and the ratio of the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022.
So, when load circuit 103 short circuit, auxiliary winding 1022 can flow through instantaneous large-current, ratio due to the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022, then primary winding 1021 probably also flows through instantaneous large-current, because the primary winding 1021 of transformer 102 is connected with input source 100 by electronic switch 101, and electronic switch 101 is usually comparatively accurate, allow the maximum current that flows through less, electronic switch 101 is probably punctured by instantaneous large-current and causes damaging.
In embodiments of the present invention, when load circuit 103 short circuit of described isolated power converters, short-circuit detecting module 200 detects this situation rapidly, and send short-circuit signal to described control module 201, after control module 201 receives the short-circuit signal from short-circuit detecting module 200, electronic switch 101 can be controlled rapidly quit work to disconnect the connection between described input source 100 and transformer 102, the possibility that the comparatively accurate electronic switch 101 greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously.
In the technical scheme of the present embodiment, provide a kind of short circuit protection system of isolated power converters, the short circuit protection system of this isolated power converters comprises: short-circuit detecting module and control module.When the load circuit short circuit of described isolated power converters, short-circuit detecting module can detect rapidly the load circuit short circuit of described isolated power converters, and send short-circuit signal to described control module, after described control module receives short-circuit signal, described electronic switch can be controlled immediately and disconnect connection between described input source and transformer, rapid realization is protected described isolated power converters, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously and lost efficacy, reduce the maintenance cost of isolated power converters.
Embodiment two
The embodiment of the present invention provides a kind of short circuit protection system of isolated power converters; as shown in Figure 1; described isolated power converters comprises: input source 100, electronic switch 101 and the transformer 102 be connected with described input source 100 by described electronic switch 101, and the short circuit protection system of described isolated power converters comprises:
Short-circuit detecting module 200, for when load circuit 103 short circuit of described isolated power converters being detected, sends short-circuit signal to control module 201;
Control module 201, when receiving the short-circuit signal from described short-circuit detecting module 200, controls the connection that described electronic switch 101 disconnects described transformer 102 and described input source 100.
Isolated power converters realizes electric current between the input side of isolated power converters and outlet side to isolate by transformer 102, and between input side and outlet side transferring energy.
Transformer 102 is the devices utilizing electromagnetic induction principle electric energy transmitting or the signal of telecommunication, and it has the effect of transformation, unsteady flow and impedance.The kind of transformer 102 is a lot, applies very extensive.Carry out long distance power transmission after such as the voltage that generator sends being raised with power transformer 102 in electric power system, with transformer 102, voltage is reduced so that user uses again after arriving destination, reduce the loss of electric energy in transmitting procedure with this; In electronic equipment and instrument, conventional small-power input source transformer 102 changes line voltage, then by rectification and filtering, obtains the direct voltage required for circuit; With transformer 102 transmission of signal or the coupling of carrying out impedance etc. of coupling in amplifying circuit.
As shown in Figure 2, the critical piece of transformer 102 is an iron core 1020 and two windings be enclosed within iron core, and winding is the circuit of transformer 102, generally forms with insulated copper wire or aluminum steel (lenticular wire or circle line) coiling.The winding be connected with input source 100 in transformer 102 is primary winding 1021, the side being provided with primary winding 1021 is called former limit, be connected with load circuit 103 and provide the winding of the energy to be auxiliary winding 1022 to load circuit 103, the side being provided with auxiliary winding 1022 is called secondary.Wherein, between primary winding 1021 and auxiliary winding 1022, only have magnetic coupling, be not electrically connected.
When transformer 102 works, alternating voltage is inputted at primary winding 1021, produce the alternating flux of interlinkage primary winding 1021 and auxiliary winding 1022, the alternating flux of conversion changes into and exports with the output voltage of the input voltage same frequency on primary winding 1021 by auxiliary winding 1022.
Wherein, the ratio of the both end voltage of auxiliary winding 1022 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, and the ratio of the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022.
So, when load circuit 103 short circuit, auxiliary winding 1022 can flow through instantaneous large-current, ratio due to the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022, then primary winding 1021 probably also flows through instantaneous large-current, because the primary winding 1021 of transformer 102 is connected with input source 100 by electronic switch 101, and electronic switch 101 is usually comparatively accurate, allow the maximum current that flows through less, electronic switch 101 is probably punctured by instantaneous large-current and causes damaging.
In embodiments of the present invention, when load circuit 103 short circuit of described isolated power converters, short-circuit detecting module 200 detects this situation rapidly, and send short-circuit signal to described control module 201, after control module 201 receives the short-circuit signal from short-circuit detecting module 200, electronic switch 101 can be controlled rapidly quit work to disconnect the connection between described input source 100 and transformer 102, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously.
Wherein, as shown in Figure 3, described short-circuit detecting module 200 comprises:
Be arranged at the former limit of described transformer 102 or the additional winding 2000 of secondary;
Judging submodule 2001, for when judging that the actual output voltage of described additional winding 2000 is less than or equal to the preset value of the output voltage of described additional winding 2000, sending short-circuit signal to described control module 201.
On the former limit of described transformer 102 or secondary, additional winding 2000 is set, then when transformer 102 works, alternating voltage is inputted at primary winding 1021, the alternating flux interlinkage primary winding 1021 produced, auxiliary winding 1022 and additional winding 2000, the both end voltage of auxiliary winding 1022 and additional winding 2000, the i.e. same frequency of the both end voltage of output voltage and primary winding 1021, and the ratio of the both end voltage of the both end voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, the ratio of the additional both end voltage of winding 2000 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021.
When load circuit 103 short circuit, both end voltage on auxiliary winding 1022 is subject to the impact of the load circuit 103 of short circuit, rapid decline, be subject to the impact of the both end voltage on auxiliary winding 1022, the both end voltage of primary winding 1021 also declines rapidly, and then, the both end voltage of additional winding 2000 and primary winding 1021 equally rapid decline.
Then when the both end voltage of additional winding 2000, namely actual output voltage declines rapidly, when judging that submodule 2001 judges that the actual output voltage of described additional winding 2000 is less than or equal to the preset value of the output voltage of described additional winding 2000, send short-circuit signal to described control module 201.
When described control module 201 receives the short-circuit signal from described short-circuit detecting module 200, control module 201 controls rapidly the connection that electronic switch 101 disconnects described input source 100 and described transformer 102, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously.
In addition, described judgement submodule 2001 also can be used for, when judging that the actual output current of described additional winding 2000 is more than or equal to the preset value of the output current of described additional winding 2000, sending short-circuit signal to described control module 201.
Mention above, wherein, the ratio of the both end voltage of auxiliary winding 1022 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, and the ratio of the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022.
In like manner, after the former limit of described transformer 102 or secondary arrange additional winding 2000, the ratio of the additional both end voltage of winding 2000 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of additional winding 2000 and the number of turn of primary winding 1021, and the ratio of the additional output current of winding 2000 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of additional winding 2000.
So, when load circuit 103 short circuit, auxiliary winding 1022 can flow through instantaneous large-current, ratio due to the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022, then primary winding 1021 probably also flows through instantaneous large-current, be subject to the impact of the instantaneous large-current that primary winding 1021 flows through, described additional winding 2000 also can flow through instantaneous large-current.Now described judgement submodule 2001 judges that the actual output current of described additional winding 2000 is more than or equal to the preset value of the output current of described additional winding 2000, sends short-circuit signal to described control module 201.
Further, as shown in Figure 4, described short-circuit detecting mould 200 also comprises:
Sampling filter submodule 2002, for actual output voltage or the actual output current of winding 2000 additional described in sampling filter.
Commutator module 2003, for carrying out rectification to the actual output voltage of additional winding 2000 or actual output current.
Sampling filter submodule 2002 is connected with additional winding 2000, the actual output voltage of additional winding 2000 described in periodic samples or actual output current, because additional winding 2000 may be subject to the impact in all the other magnetic fields except the magnetic field that primary winding 1021 produces at work, in general, sampling filter submodule 2002 is also needed to carry out filtering to the actual output voltage of additional winding 2000 or actual output current.
Input voltage due to primary winding 1021 is alternating voltage, then the actual output voltage of additional winding 2000 is the alternating voltage identical with the input voltage frequency of primary winding 1021, in order to make to judge that submodule 2001 more adequately can judge load circuit 103 whether short circuit, need the actual output voltage of additional winding 2000 be changed into d. c. voltage signal, then sampling filter submodule 2002 is by the alternating voltage signal input rectifying submodule 2003 of sampling from additional winding 2000, after the rectification process of commutator module 2003, alternating voltage signal is converted into d. c. voltage signal, judge that the preset value of the output voltage of this d. c. voltage signal and described additional winding 2000 can compare by submodule 2001, when this d. c. voltage signal is greater than the preset value of the output voltage of described additional winding 2000, judge that submodule 2001 does not outwards output signal, and when this d. c. voltage signal is less than or equal to the preset value of the output voltage of described additional winding 2000, load circuit 103 short circuit is described, judge that submodule 2001 sends short-circuit signal to control module 201, after control module 201 receives this short-circuit signal, control the connection that electronic switch 101 quits work to disconnect described input source 100 and transformer 102 immediately.
In general, the preset value of the output voltage of described additional winding 2000 can be when load circuit 103 normally works, the galvanic current pressure value that the actual output voltage of described additional winding 2000 obtains after commutator module 2003 processes.
It should be noted that, voltage is electrical potential difference, and in order to obtain the output voltage of described additional winding 2000, in general, ground connection is answered in one end of additional winding 2000.
So when described additional winding 2000 is arranged at the former limit of described transformer 102, one end of described additional winding 2000 and the former limit of described transformer 102 are altogether;
Another kind of situation, when described additional winding 2000 is arranged at the secondary of described transformer 102, one end of described additional winding 2000 and the secondary of described transformer 102 are altogether.
In addition, when the actual output current of described sampling submodule 2002 for described additional winding 2000 of sampling, input voltage due to primary winding 1021 is alternating voltage, then the actual output current of additional winding 2000 is the alternating current identical with the input voltage frequency of primary winding 1021, in order to make to judge that submodule 2001 more adequately can judge load circuit 103 whether short circuit, need the actual output current of additional winding 2000 be changed into DC current signal, then sampling filter submodule 2002 is by the AC signal input rectifying submodule 2003 of sampling from additional winding 2000, after the rectification process of commutator module 2003, AC signal is converted into DC current signal.Judge that the preset value of the output current of this DC current signal and described additional winding 2000 can compare by submodule 2001, when this DC current signal is less than the preset value of the output current of described additional winding 2000, judge that submodule 2001 does not outwards output signal, and when this DC current signal is more than or equal to the preset value of the output current of described additional winding 2000, load circuit 103 short circuit is described, judge that submodule 2001 sends short-circuit signal to control module 201, after control module 201 receives this short-circuit signal, control the connection that electronic switch 101 quits work to disconnect described input source 100 and transformer 102 immediately.
In the technical scheme of the present embodiment, provide a kind of short circuit protection system of isolated power converters, the short circuit protection system of this isolated power converters comprises: short-circuit detecting module and control module.When the load circuit short circuit of described isolated power converters, short-circuit detecting module can detect rapidly the load circuit short circuit of described isolated power converters, and send short-circuit signal to described control module, after described control module receives short-circuit signal, described electronic switch can be controlled immediately and disconnect connection between described input source and transformer, rapid realization is protected described isolated power converters, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously and lost efficacy, reduce the maintenance cost of isolated power converters.
Embodiment three
The embodiment of the present invention provides a kind of short-circuit protection method of isolated power converters; described isolated power converters comprises: input source 100, electronic switch 101 and the transformer 102 be connected with described input source by described electronic switch 101; as shown in Figure 5, the method comprises:
Step S101, when short-circuit detecting module 200 detects load circuit 103 short circuit of described isolated power converters, send short-circuit signal to control module 201;
Step S102, when control module 201 receives the short-circuit signal from described short-circuit detecting module 200, control the connection that described electronic switch 101 disconnects described transformer 102 and described input source 100.
As shown in Figure 1, isolated power converters realizes electric current between the input side of isolated power converters and outlet side to isolate by transformer 102, and between input side and outlet side transferring energy.
Transformer 102 is the devices utilizing electromagnetic induction principle electric energy transmitting or the signal of telecommunication, and it has the effect of transformation, unsteady flow and impedance.The kind of transformer 102 is a lot, applies very extensive.Carry out long distance power transmission after such as the voltage that generator sends being raised with power transformer 102 in electric power system, with transformer 102, voltage is reduced so that user uses again after arriving destination, reduce the loss of electric energy in transmitting procedure with this; In electronic equipment and instrument, conventional small-power input source transformer 102 changes line voltage, then by rectification and filtering, obtains the direct voltage required for circuit; With transformer 102 transmission of signal or the coupling of carrying out impedance etc. of coupling in amplifying circuit.
As shown in Figure 2, the critical piece of transformer 102 is an iron core 1020 and two windings be enclosed within iron core, and winding is the circuit of transformer 102, generally forms with insulated copper wire or aluminum steel (lenticular wire or circle line) coiling.The winding be connected with input source 100 in transformer 102 is primary winding 1021, the side being provided with primary winding 1021 is called former limit, be connected with load circuit 103 and provide the winding of the energy to be auxiliary winding 1022 to load circuit 103, the side being provided with auxiliary winding 1022 is called secondary.Wherein, between primary winding 1021 and auxiliary winding 1022, only have magnetic coupling, be not electrically connected.
When transformer 102 works, alternating voltage is inputted at primary winding 1021, produce the alternating flux of interlinkage primary winding 1021 and auxiliary winding 1022, the alternating flux of conversion changes into and exports with the output voltage of the input voltage same frequency on primary winding 1021 by auxiliary winding 1022.
Wherein, the ratio of the both end voltage of auxiliary winding 1022 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, and the ratio of the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022.
So, when load circuit 103 short circuit, auxiliary winding 1022 can flow through instantaneous large-current, ratio due to the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022, then primary winding 1021 probably also flows through instantaneous large-current, because the primary winding 1021 of transformer 102 is connected with input source 100 by electronic switch 101, and electronic switch 101 is usually comparatively accurate, allow the maximum current that flows through less, electronic switch 101 is probably punctured by instantaneous large-current and causes damaging.
In embodiments of the present invention, when load circuit 103 short circuit of described isolated power converters, short-circuit detecting module 200 detects this situation rapidly, and send short-circuit signal to described control module 201, after control module 201 receives the short-circuit signal from short-circuit detecting module 200, electronic switch 101 can be controlled rapidly quit work to disconnect the connection between described input source 100 and transformer 102, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously.
Wherein, as shown in Figure 3, described short-circuit detecting module 200 comprises:
Be arranged at the former limit of described transformer 102 or the additional winding 2000 of secondary;
Judging submodule 2001, for when judging that the actual output voltage of described additional winding is less than or equal to the preset value of the output voltage of described additional winding 2000, sending short-circuit signal to described control module 200.
On the former limit of described transformer 102 or secondary, additional winding 2000 is set, then when transformer 102 works, alternating voltage is inputted at primary winding 1021, the alternating flux interlinkage primary winding 1021 produced, auxiliary winding 1022 and additional winding 2000, the both end voltage of auxiliary winding 1022 and additional winding 2000, the i.e. same frequency of the both end voltage of output voltage and primary winding 1021, and the ratio of the both end voltage of the both end voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, the ratio of the additional both end voltage of winding 2000 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021.
When load circuit 103 short circuit, both end voltage on auxiliary winding 1022 is subject to the impact of the load circuit 103 of short circuit, rapid decline, be subject to the impact of the both end voltage on auxiliary winding 1022, the both end voltage of primary winding 1021 also declines rapidly, and then, the both end voltage of additional winding 2000 and primary winding 1021 equally rapid decline.
Then when the both end voltage of additional winding 2000, namely actual output voltage declines rapidly, when judging that submodule 2001 judges that the actual output voltage of described additional winding 2000 is less than or equal to the preset value of the output voltage of described additional winding 2000, send short-circuit signal to described control module 201.
So step S102 is specially:
When judging that submodule 2001 judges that the actual output voltage of described additional winding 2000 is less than the preset value of the output voltage of described additional winding 2000, send short-circuit signal to described control module 200.
When described control module 200 receives the short-circuit signal from described short-circuit detecting module 201, control module 201 controls rapidly the connection that electronic switch 101 disconnects described input source 100 and described transformer 102, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously.
In addition, mention above, wherein, the ratio of the both end voltage of auxiliary winding 1022 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of auxiliary winding 1022 and the number of turn of primary winding 1021, and the ratio of the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022.
In like manner, after the former limit of described transformer 102 or secondary arrange additional winding 2000, the ratio of the additional both end voltage of winding 2000 and the both end voltage of primary winding 1021 equals the ratio of the number of turn of additional winding 2000 and the number of turn of primary winding 1021, and the ratio of the additional output current of winding 2000 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of additional winding 2000.
So step S102 also can be specially:
When judging that submodule 2001 judges that the actual output current of described additional winding 2000 is more than or equal to the preset value of the output current of described additional winding 2000, send short-circuit signal to described control module 201.
When load circuit 103 short circuit, auxiliary winding 1022 can flow through instantaneous large-current, ratio due to the output current of auxiliary winding 1022 and the input current of primary winding 1021 equals the ratio of the number of turn of primary winding 1021 and the number of turn of auxiliary winding 1022, then primary winding 1021 probably also flows through instantaneous large-current, be subject to the impact of the instantaneous large-current that primary winding 1021 flows through, described additional winding 2000 also can flow through instantaneous large-current.Now described judgement submodule 2001 judges that the actual output current of described additional winding 2000 is more than or equal to the preset value of the output current of described additional winding 2000, sends short-circuit signal to described control module 201.
Further, as shown in Figure 4, described short-circuit detecting module 200 also comprises:
Sampling filter submodule 2002, for actual output voltage or the actual output current of winding 2000 additional described in sampling filter.
Commutator module 2003, for carrying out rectification to the actual output voltage of additional winding 2000 or actual output current.
Sampling filter submodule 2002 is connected with additional winding 2000, the actual output voltage of additional winding 2000 described in periodic samples or actual output current, because additional winding 2000 may be subject to the impact in all the other magnetic fields except the magnetic field that primary winding 1021 produces at work, in general, sampling filter submodule 2002 is also needed to carry out filtering to the actual output voltage of additional winding 2000 or actual output current.
Input voltage due to primary winding 1021 is alternating voltage, then the actual output voltage of additional winding 2000 is the alternating voltage identical with the input voltage frequency of primary winding 1021, in order to make to judge that submodule 2001 more adequately can judge load circuit 103 whether short circuit, need the actual output voltage of additional winding 2000 be changed into d. c. voltage signal, then sampling filter submodule 2002 is by the alternating voltage signal input rectifying submodule 2003 of sampling from additional winding 2000, after the rectification process of commutator module 2003, alternating voltage signal is converted into d. c. voltage signal, judge that the preset value of the output voltage of this d. c. voltage signal and described additional winding 2000 can compare by submodule 2001, when this d. c. voltage signal is greater than the preset value of the output voltage of described additional winding 2000, judge that submodule 2001 does not outwards output signal, and when this d. c. voltage signal is less than or equal to the preset value of the output voltage of described additional winding 2000, load circuit 103 short circuit is described, judge that submodule 2001 sends short-circuit signal to control module 200, after control module 200 receives this short-circuit signal, control the connection that electronic switch 101 disconnects described input source 100 and transformer 102 immediately.
In general, the preset value of the output voltage of described additional winding 2000 can be when load circuit 103 normally works, the galvanic current pressure value that the actual output voltage of described additional winding 2000 obtains after commutator module 2003 processes.
In addition, when the actual output current of described sampling submodule 2002 for described additional winding 2000 of sampling, input voltage due to primary winding 1021 is alternating voltage, then the actual output current of additional winding 2000 is the alternating current identical with the input voltage frequency of primary winding 1021, in order to make to judge that submodule 2001 more adequately can judge load circuit 103 whether short circuit, need the actual output current of additional winding 2000 be changed into DC current signal, then sampling filter submodule 2002 is by the AC signal input rectifying submodule 2003 of sampling from additional winding 2000, after the rectification process of commutator module 2003, AC signal is converted into DC current signal.Judge that the preset value of the output current of this DC current signal and described additional winding 2000 can compare by submodule 2001, when this DC current signal is less than the preset value of the output current of described additional winding 2000, judge that submodule 2001 does not outwards output signal, and when this DC current signal is more than or equal to the preset value of the output current of described additional winding 2000, load circuit 103 short circuit is described, judge that submodule 2001 sends short-circuit signal to control module 201, after control module 201 receives this short-circuit signal, control the connection that electronic switch 101 quits work to disconnect described input source 100 and transformer 102 immediately.
In the technical scheme of the present embodiment, provide a kind of short-circuit protection method of isolated power converters, when the load circuit short circuit of described isolated power converters, short-circuit detecting module can detect rapidly the load circuit short circuit of described isolated power converters, and send short-circuit signal to described control module, after described control module receives short-circuit signal, described electronic switch can be controlled immediately and disconnect connection between described input source and transformer, rapid realization is protected described isolated power converters, the possibility that the comparatively accurate electronic switch greatly reducing the input of described isolated power converters is punctured by the big current flow through instantaneously and lost efficacy, reduce the maintenance cost of isolated power converters.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (4)
1. the short circuit protection system of an isolated power converters; described isolated power converters comprises: input source, electronic switch and the transformer be connected with described input source by described electronic switch; it is characterized in that, the short circuit protection system of described isolated power converters comprises:
Short-circuit detecting module, for when the load circuit short circuit of described isolated power converters being detected, sends short-circuit signal to control module;
Control module, when receiving the short-circuit signal from described short-circuit detecting module, controls the connection that described electronic switch disconnects described transformer and described input source;
Described short-circuit detecting module comprises:
Be arranged at the former limit of described transformer or the additional winding of secondary;
Sampling filter submodule, for actual output voltage or the actual output current of winding additional described in sampling filter;
Commutator module, for carrying out rectification to the actual output voltage of additional winding or actual output current;
Judge submodule, for when determine be less than or equal to the preset value of the output voltage of described additional winding through the actual output voltage of over commutation time, send short-circuit signal to described control module; Or
For when determine be more than or equal to the preset value of the output current of described additional winding through the actual output current of over commutation time, send short-circuit signal to described control module.
2. system according to claim 1, is characterized in that,
When described additional winding is arranged at the former limit of described transformer, one end of described additional winding and the former limit of described transformer are altogether.
3. system according to claim 1, is characterized in that,
When described additional winding is arranged at the secondary of described transformer, one end of described additional winding and the secondary of described transformer are altogether.
4. the short-circuit protection method of an isolated power converters; described isolated power converters comprises: input source, electronic switch and the transformer be connected with described input source by described electronic switch; it is characterized in that; the former limit of described transformer or secondary are provided with additional winding, and described method comprises:
When short-circuit detecting module detects the load circuit short circuit of described isolated power converters, send short-circuit signal to control module;
When control module receives the short-circuit signal from described short-circuit detecting module, control the connection that described electronic switch disconnects described transformer and described input source;
When short-circuit detecting module detects the load circuit short circuit of described isolated power converters, send short-circuit signal to control module and be specially:
When judging that the actual output voltage of the commutator module rectification that submodule determines in short-circuit detecting module is less than or equal to the preset value of the output voltage of described additional winding, send short-circuit signal to described control module; Or
When judging that the actual output current of the commutator module rectification that submodule determines in short-circuit detecting module is more than or equal to the preset value of the output current of described additional winding, send short-circuit signal to described control module.
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| TWI542122B (en) * | 2014-06-19 | 2016-07-11 | 立錡科技股份有限公司 | Power supply system and short circuit and/or bad connection detection method thereof, and power converter thereof |
| CN104168006A (en) * | 2014-08-15 | 2014-11-26 | 常州工学院 | Delayed power-on and power-off circuit |
| CN106329699B (en) * | 2015-06-24 | 2019-03-05 | 维谛技术有限公司 | A kind of uninterruptible power supply and its control method, control device |
| WO2019061139A1 (en) * | 2017-09-28 | 2019-04-04 | 深圳传音通讯有限公司 | Short circuit protection method and apparatus |
| CN114326497A (en) * | 2021-12-24 | 2022-04-12 | 湖南长高思瑞自动化有限公司 | Isolation switch reliability test platform |
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| US4156273A (en) * | 1976-10-07 | 1979-05-22 | Sanyo Electric Co., Ltd. | Protection of a switching regulator |
| KR100229507B1 (en) * | 1997-02-21 | 1999-11-15 | 윤종용 | Switching mode power supplier having function of protecting circuit from abnormal voltage |
| JP2004015900A (en) * | 2002-06-05 | 2004-01-15 | Omron Corp | Electric power conversion system of push-pull circuit |
| CN2802837Y (en) * | 2004-12-31 | 2006-08-02 | 李运秀 | Switch power protection device short-circuit and overcurrent |
| CN101677214B (en) * | 2008-09-17 | 2012-06-06 | 比亚迪股份有限公司 | Switching mode power source |
| CN101662218A (en) * | 2009-09-04 | 2010-03-03 | 福建星网锐捷网络有限公司 | Switch power supply, system and protection method |
| CN102035415B (en) * | 2010-12-24 | 2013-02-27 | 常州博拓电子科技有限公司 | Constant-current implementation method for isolated AC/DC switched power supply for LED illumination drive and special device thereof |
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