CN102611079A - 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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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, relate in particular to a kind of short circuit protection system and method for isolated power converter.
Background technology
The characteristic of isolated power converter is between its input circuit and output circuit, to provide electric current to isolate, and that is to say, does not have the current path that allows electric current to flow to outlet side from the input side of isolated power converter.Usually, isolated power converter comprises the energy transfer element such as transformer etc., so that the input side and the outlet side electric current of isolated power converter are isolated.
The inventor finds in realizing process of the present invention, and when the load circuit short circuit of the outlet side of isolated power converter, the electronic switch of the input of isolated power converter is prone to punctured and damage by the big electric current that transient flow is crossed.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of short circuit protection system and method for isolated power converter; In the time of can realizing the load circuit short circuit when isolated power converter; Realize rapidly said isolated power converter protection has been improved the reliability of said isolated power converter greatly.
For solving the problems of the technologies described above, the short circuit protection system of the isolated power converter of the present invention and method adopt following technical scheme:
A kind of short circuit protection system of isolated power converter; Said isolated power converter comprises: input source, electronic switch and the transformer that is connected with said input source through said electronic switch, and the short circuit protection system of said isolated power converter comprises:
The short-circuit detecting module is used for when detecting the load circuit short circuit of said isolated power converter, sends short-circuit signal to control module;
Control module when the short-circuit signal that receives from said short-circuit detecting module, is controlled said electronic switch and is broken off being connected of said transformer and said input source.
A kind of short-circuit protection method of isolated power converter, said isolated power converter comprises: input source, electronic switch and the transformer that is connected with said input source through said electronic switch, said method comprises:
When the short-circuit detecting module detects the load circuit short circuit of said isolated power converter, send short-circuit signal to control module;
When control module receives the short-circuit signal from said short-circuit detecting module, control said electronic switch and break off being connected of said transformer and said input source.
In the technical scheme of present embodiment, a kind of short circuit protection system of isolated power converter is provided, the short circuit protection system of this isolated power converter comprises: short-circuit detecting module and control module.When the load circuit short circuit of said isolated power converter; The short-circuit detecting module can detect the load circuit short circuit of said isolated power converter rapidly; And to said control module transmission short-circuit signal; After said control module receives short-circuit signal, can control said electronic switch immediately and break off being connected between said input source and the transformer, realize rapidly said isolated power converter protection; Greatly reduce that big electric current that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow punctures and the possibility that lost efficacy, reduced the maintenance cost of isolated power converter.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the short circuit protection system structural representation of isolated power converter in the embodiment of the invention;
Fig. 2 is a transformer device structure sketch map in the prior art;
Fig. 3 is a short circuit detection module structural representation one in the embodiment of the invention;
Fig. 4 is a short circuit detection module structural representation two in the embodiment of the invention;
Fig. 5 is the short-circuit protection method flow chart of isolated power converter in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one
The embodiment of the invention provides a kind of short circuit protection system of isolated power converter; As shown in Figure 1; Said isolated power converter comprises: input source 100, electronic switch 101 and the transformer 102 that is connected with said input source 100 through said electronic switch 101, and the short circuit protection system of said isolated power converter comprises:
Short-circuit detecting module 200 is used for when the load circuit that detects said isolated power converter 103 short circuits, sends short-circuit signal to control module 201;
Isolated power converter is realized electric current between the input side of isolated power converter and the outlet side is isolated through transformer 102, and between input side and outlet side, transmits energy.
Transformer 102 is the devices that utilize the 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, uses very extensively.Carry out long distance power transmission after raising such as the voltage that in electric power system, sends generator, reduce voltage so that user's use reduces the loss of electric energy in the transmission course with this with transformer 102 again after arriving the destination with power transformer 102; Small-power input source transformer 102 commonly used changes line voltage in electronic equipment and instrument, again through rectification and filtering, obtains the circuits needed direct voltage; Transformer 102 with coupling in amplifying circuit transmits signal or carries out coupling of impedance or the like.
As shown in Figure 2, the critical piece of transformer 102 is iron cores 1020 and is enclosed within two windings on the iron core that winding is the circuit of transformer 102, generally forms with insulated copper wire or aluminum steel (lenticular wire or circle line) coiling.The winding that is connected with input source 100 in the transformer 102 is a primary winding 1021; A side that is provided with primary winding 1021 is called former limit; Being connected and to load circuit 103 winding of the energy being provided with load circuit 103 is auxiliary winding 1022, and a side that is provided with auxiliary winding 1022 is called secondary.Wherein, have only the magnetic coupling between primary winding 1021 and the auxiliary winding 1022, do not electrically connect.
During transformer 102 work; At primary winding 1021 input alternating voltages; Produce the alternating flux of interlinkage primary winding 1021 and auxiliary winding 1022, auxiliary winding 1022 with the alternating flux of conversion change into primary winding 1021 on the output voltage output of input voltage same frequency.
Wherein, The ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, and the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021.
So; When load circuit 103 short circuits; Can flow through instantaneous large-current on the auxiliary winding 1022, because the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021, then primary winding 1021 also flows through instantaneous large-current probably; Because the primary winding 1021 of transformer 102 is connected with input source 100 through electronic switch 101; And electronic switch 101 is comparatively accurate usually, and the maximum current that allows to flow through is less, and electronic switch 101 is punctured by instantaneous large-current probably and causes damaging.
In embodiments of the present invention; When load circuit 103 short circuits of said isolated power converter; Short-circuit detecting module 200 detects this situation rapidly; And to said control module 201 transmission short-circuit signals; After control module 201 receives the short-circuit signal from short-circuit detecting module 200, can control electronic switch 101 rapidly and quit work, greatly reduce the possibility that big electric current that the comparatively accurate electronic switch 101 of the input of said isolated power converter crossed by transient flow punctures to break off being connected between said input source 100 and the transformer 102.
In the technical scheme of present embodiment, a kind of short circuit protection system of isolated power converter is provided, the short circuit protection system of this isolated power converter comprises: short-circuit detecting module and control module.When the load circuit short circuit of said isolated power converter; The short-circuit detecting module can detect the load circuit short circuit of said isolated power converter rapidly; And to said control module transmission short-circuit signal; After said control module receives short-circuit signal, can control said electronic switch immediately and break off being connected between said input source and the transformer, realize rapidly said isolated power converter protection; Greatly reduce that big electric current that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow punctures and the possibility that lost efficacy, reduced the maintenance cost of isolated power converter.
Embodiment two
The embodiment of the invention provides a kind of short circuit protection system of isolated power converter; As shown in Figure 1; Said isolated power converter comprises: input source 100, electronic switch 101 and the transformer 102 that is connected with said input source 100 through said electronic switch 101, and the short circuit protection system of said isolated power converter comprises:
Short-circuit detecting module 200 is used for when the load circuit that detects said isolated power converter 103 short circuits, sends short-circuit signal to control module 201;
Isolated power converter is realized electric current between the input side of isolated power converter and the outlet side is isolated through transformer 102, and between input side and outlet side, transmits energy.
Transformer 102 is the devices that utilize the 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, uses very extensively.Carry out long distance power transmission after raising such as the voltage that in electric power system, sends generator, reduce voltage so that user's use reduces the loss of electric energy in the transmission course with this with transformer 102 again after arriving the destination with power transformer 102; Small-power input source transformer 102 commonly used changes line voltage in electronic equipment and instrument, again through rectification and filtering, obtains the circuits needed direct voltage; Transformer 102 with coupling in amplifying circuit transmits signal or carries out coupling of impedance or the like.
As shown in Figure 2, the critical piece of transformer 102 is iron cores 1020 and is enclosed within two windings on the iron core that winding is the circuit of transformer 102, generally forms with insulated copper wire or aluminum steel (lenticular wire or circle line) coiling.The winding that is connected with input source 100 in the transformer 102 is a primary winding 1021; A side that is provided with primary winding 1021 is called former limit; Being connected and to load circuit 103 winding of the energy being provided with load circuit 103 is auxiliary winding 1022, and a side that is provided with auxiliary winding 1022 is called secondary.Wherein, have only the magnetic coupling between primary winding 1021 and the auxiliary winding 1022, do not electrically connect.
During transformer 102 work; At primary winding 1021 input alternating voltages; Produce the alternating flux of interlinkage primary winding 1021 and auxiliary winding 1022, auxiliary winding 1022 with the alternating flux of conversion change into primary winding 1021 on the output voltage output of input voltage same frequency.
Wherein, The ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, and the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021.
So; When load circuit 103 short circuits; Can flow through instantaneous large-current on the auxiliary winding 1022, because the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021, then primary winding 1021 also flows through instantaneous large-current probably; Because the primary winding 1021 of transformer 102 is connected with input source 100 through electronic switch 101; And electronic switch 101 is comparatively accurate usually, and the maximum current that allows to flow through is less, and electronic switch 101 is punctured by instantaneous large-current probably and causes damaging.
In embodiments of the present invention; When load circuit 103 short circuits of said isolated power converter; Short-circuit detecting module 200 detects this situation rapidly; And to said control module 201 transmission short-circuit signals; After control module 201 receives the short-circuit signal from short-circuit detecting module 200, can control electronic switch 101 rapidly and quit work, greatly reduce the possibility that big electric current that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow punctures to break off being connected between said input source 100 and the transformer 102.
Wherein, as shown in Figure 3, said short-circuit detecting module 200 comprises:
Be arranged at the former limit of said transformer 102 or the additional winding 2000 of secondary;
Former limit or secondary at said transformer 102 are provided with additional winding 2000; Then when transformer 102 work; At primary winding 1021 input alternating voltages; The alternating flux interlinkage primary winding 1021, auxiliary winding 1022 and the additional winding 2000 that produce; The voltage of auxiliary winding 1022 and additional winding 2000; Be the same frequency of voltage of output voltage and primary winding 1021, and the ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, the ratio of the voltage of additional winding 2000 and the voltage of primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022.
When load circuit 103 short circuits; Voltage on the auxiliary winding 1022 receives the influence of the load circuit 103 of short circuit; Descend rapidly, receive the influence of the voltage on the auxiliary winding 1022, the voltage of primary winding 1021 also descends rapidly; And then, the voltage and primary winding 1021 the same rapid declines of additional winding 2000.
Then when the voltage of adding winding 2000; Be that actual output voltage descends rapidly; Judge that submodule 2001 judges when the actual output voltage of said additional winding 2000 is less than or equal to the preset value of output voltage of said additional winding 2000, send short-circuit signals to said control module 201.
When said control module 201 receives the short-circuit signal from said short-circuit detecting module 200; Control module 201 control electronic switches 101 is rapidly broken off being connected of said input source 100 and said transformer 102, greatly reduces the possibility of the big electric current puncture that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow.
In addition, said judgement submodule 2001 also can be used for sending short-circuit signals when the actual output current of judging said additional winding 2000 during more than or equal to the preset value of the output current of said additional winding 2000 to said control module 201.
Mention in the preamble; Wherein, The ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, and the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021.
In like manner; After the former limit of said transformer 102 or secondary are provided with additional winding 2000; The ratio of the voltage of additional winding 2000 and the voltage of primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of additional winding 2000, and the ratio of input current that adds output current and the primary winding 1021 of winding 2000 equals the ratio of the number of turn of the number of turn and the additional winding 2000 of primary winding 1021.
So; When load circuit 103 short circuits; Can flow through instantaneous large-current on the auxiliary winding 1022, because the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021, then primary winding 1021 also flows through instantaneous large-current probably; Receive the influence of the instantaneous large-current that flows through on the primary winding 1021, also can flow through instantaneous large-current on the said additional winding 2000.This moment, said judgement submodule 2001 was judged the preset value of the actual output current of said additional winding 2000 more than or equal to the output current of said additional winding 2000, sent short-circuit signal to said control module 201.
Further, as shown in Figure 4, said short-circuit detecting mould 200 also comprises:
Because the input voltage of primary winding 1021 is an 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; Judge that in order to make submodule 2001 can judge whether short circuit of load circuit 103 comparatively exactly; The actual output voltage that needs to add winding 2000 changes d. c. voltage signal into; Then sampling filter submodule 2002 will be sampled from the alternating voltage signal input rectifying submodule 2003 of additional winding 2000, and after handling through the rectification of commutator module 2003, the alternating voltage signal is converted into d. c. voltage signal; Judge that submodule 2001 can compare the preset value of the output voltage of this d. c. voltage signal and said additional winding 2000; When this d. c. voltage signal during greater than the preset value of the output voltage of said additional winding 2000, judge that submodule 2001 outwards do not export signal, and when this d. c. voltage signal is less than or equal to the preset value of output voltage of said additional winding 2000; Load circuit 103 short circuits are described; Judge that submodule 2001 sends short-circuit signals to control module 201, after control module 201 receives this short-circuit signal, control electronic switch 101 immediately and quit work to break off being connected of said input source 100 and transformer 102.
In general, the preset value of the output voltage of said additional winding 2000 can be when load circuit 103 operate as normal, and the actual output voltage of said additional winding 2000 is handled the resulting galvanic current pressure value in back through commutator module 2003.
Need to prove that voltage is electrical potential difference, in order to obtain the output voltage of said additional winding 2000, in general, an end of additional winding 2000 is answered ground connection.
So when said additional winding 2000 was arranged at the former limit of said transformer 102, an end of said additional winding 2000 and the former limit of said transformer 102 were altogether;
Another kind of situation, when said additional winding 2000 was arranged at the secondary of said transformer 102, an end of said additional winding 2000 and the secondary of said transformer 102 were altogether.
In addition; When said sampling submodule 2002 is used to sample the actual output current of said additional winding 2000; Because the input voltage of primary winding 1021 is an 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; Judge that in order to make submodule 2001 can judge whether short circuit of load circuit 103 comparatively exactly, the actual output current that needs to add winding 2000 changes dc current signal into, then the sampling filter submodule 2002 AC signal input rectifying submodule 2003 of oneself additional winding 2000 of will sample; After the rectification processing through commutator module 2003, AC signal is converted into dc current signal.Judge that submodule 2001 can compare the preset value of the output current of this dc current signal and said additional winding 2000; When this dc current signal during less than the preset value of the output current of said additional winding 2000; Judgement submodule 2001 is not outwards exported signal; And, load circuit 103 short circuits are described when this dc current signal during more than or equal to the preset value of the output current of said additional winding 2000, judge that submodule 2001 sends short-circuit signals to control module 201; After control module 201 receives this short-circuit signal, control electronic switch 101 immediately and quit work to break off being connected of said input source 100 and transformer 102.
In the technical scheme of present embodiment, a kind of short circuit protection system of isolated power converter is provided, the short circuit protection system of this isolated power converter comprises: short-circuit detecting module and control module.When the load circuit short circuit of said isolated power converter; The short-circuit detecting module can detect the load circuit short circuit of said isolated power converter rapidly; And to said control module transmission short-circuit signal; After said control module receives short-circuit signal, can control said electronic switch immediately and break off being connected between said input source and the transformer, realize rapidly said isolated power converter protection; Greatly reduce that big electric current that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow punctures and the possibility that lost efficacy, reduced the maintenance cost of isolated power converter.
Embodiment three
The embodiment of the invention provides a kind of short-circuit protection method of isolated power converter; Said isolated power converter comprises: input source 100, electronic switch 101 and the transformer 102 that is connected with said input source through said electronic switch 101; As shown in Figure 5, this method comprises:
Step S101, when short-circuit detecting module 200 detects load circuit 103 short circuits of said isolated power converter, send short-circuit signals to control module 201;
Step S102, when control module 201 receives the short-circuit signal from said short-circuit detecting module 200, control said electronic switch 101 and break off being connected of said transformer 102 and said input source 100.
As shown in Figure 1, isolated power converter is realized electric current between the input side of isolated power converter and the outlet side is isolated through transformer 102, and between input side and outlet side, transmits energy.
As shown in Figure 2, the critical piece of transformer 102 is iron cores 1020 and is enclosed within two windings on the iron core that winding is the circuit of transformer 102, generally forms with insulated copper wire or aluminum steel (lenticular wire or circle line) coiling.The winding that is connected with input source 100 in the transformer 102 is a primary winding 1021; A side that is provided with primary winding 1021 is called former limit; Being connected and to load circuit 103 winding of the energy being provided with load circuit 103 is auxiliary winding 1022, and a side that is provided with auxiliary winding 1022 is called secondary.Wherein, have only the magnetic coupling between primary winding 1021 and the auxiliary winding 1022, do not electrically connect.
During transformer 102 work; At primary winding 1021 input alternating voltages; Produce the alternating flux of interlinkage primary winding 1021 and auxiliary winding 1022, auxiliary winding 1022 with the alternating flux of conversion change into primary winding 1021 on the output voltage output of input voltage same frequency.
Wherein, The ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, and the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021.
So; When load circuit 103 short circuits; Can flow through instantaneous large-current on the auxiliary winding 1022, because the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021, then primary winding 1021 also flows through instantaneous large-current probably; Because the primary winding 1021 of transformer 102 is connected with input source 100 through electronic switch 101; And electronic switch 101 is comparatively accurate usually, and the maximum current that allows to flow through is less, and electronic switch 101 is punctured by instantaneous large-current probably and causes damaging.
In embodiments of the present invention; When load circuit 103 short circuits of said isolated power converter; Short-circuit detecting module 200 detects this situation rapidly; And to said control module 201 transmission short-circuit signals; After control module 201 receives the short-circuit signal from short-circuit detecting module 200, can control electronic switch 101 rapidly and quit work, greatly reduce the possibility that big electric current that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow punctures to break off being connected between said input source 100 and the transformer 102.
Wherein, as shown in Figure 3, said short-circuit detecting module 200 comprises:
Be arranged at the former limit of said transformer 102 or the additional winding 2000 of secondary;
Former limit or secondary at said transformer 102 are provided with additional winding 2000; Then when transformer 102 work; At primary winding 1021 input alternating voltages; The alternating flux interlinkage primary winding 1021, auxiliary winding 1022 and the additional winding 2000 that produce; The voltage of auxiliary winding 1022 and additional winding 2000; Be the same frequency of voltage of output voltage and primary winding 1021, and the ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, the ratio of the voltage of additional winding 2000 and the voltage of primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022.
When load circuit 103 short circuits; Voltage on the auxiliary winding 1022 receives the influence of the load circuit 103 of short circuit; Descend rapidly, receive the influence of the voltage on the auxiliary winding 1022, the voltage of primary winding 1021 also descends rapidly; And then, the voltage and primary winding 1021 the same rapid declines of additional winding 2000.
Then when the voltage of adding winding 2000; Be that actual output voltage descends rapidly; Judge that submodule 2001 judges when the actual output voltage of said additional winding 2000 is less than or equal to the preset value of output voltage of said additional winding 2000, send short-circuit signals to said control module 201.
So step S102 is specially:
When judging actual output voltage that submodule 2001 is judged said additional winding 2000, send short-circuit signals to said control module 200 less than the preset value of the output voltage of said additional winding 2000.
When said control module 200 receives the short-circuit signal from said short-circuit detecting module 201; Control module 201 control electronic switches 101 is rapidly broken off being connected of said input source 100 and said transformer 102, greatly reduces the possibility of the big electric current puncture that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow.
In addition; Mention in the preamble; Wherein, The ratio of the voltage of the voltage of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of auxiliary winding 1022, and the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021.
In like manner; After the former limit of said transformer 102 or secondary are provided with additional winding 2000; The ratio of the voltage of additional winding 2000 and the voltage of primary winding 1021 equals the ratio of the number of turn of the number of turn and the primary winding 1021 of additional winding 2000, and the ratio of input current that adds output current and the primary winding 1021 of winding 2000 equals the ratio of the number of turn of the number of turn and the additional winding 2000 of primary winding 1021.
So step S102 also can be specially:
When judging actual output current that submodule 2001 is judged said additional winding 2000, send short-circuit signals to said control module 201 more than or equal to the preset value of the output current of said additional winding 2000.
When load circuit 103 short circuits; Can flow through instantaneous large-current on the auxiliary winding 1022; Because the ratio of the input current of the output current of auxiliary winding 1022 and primary winding 1021 equals the ratio of the number of turn of the number of turn and the auxiliary winding 1022 of primary winding 1021; Then primary winding 1021 also flows through instantaneous large-current probably, receives the influence of the instantaneous large-current that flows through on the primary winding 1021, also can flow through instantaneous large-current on the said additional winding 2000.This moment, said judgement submodule 2001 was judged the preset value of the actual output current of said additional winding 2000 more than or equal to the output current of said additional winding 2000, sent short-circuit signal to said control module 201.
Further, as shown in Figure 4, said short-circuit detecting module 200 also comprises:
Because the input voltage of primary winding 1021 is an 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; Judge that in order to make submodule 2001 can judge whether short circuit of load circuit 103 comparatively exactly; The actual output voltage that needs to add winding 2000 changes d. c. voltage signal into; Then sampling filter submodule 2002 will be sampled from the alternating voltage signal input rectifying submodule 2003 of additional winding 2000, and after handling through the rectification of commutator module 2003, the alternating voltage signal is converted into d. c. voltage signal; Judge that submodule 2001 can compare the preset value of the output voltage of this d. c. voltage signal and said additional winding 2000; When this d. c. voltage signal during greater than the preset value of the output voltage of said additional winding 2000, judge that submodule 2001 outwards do not export signal, and when this d. c. voltage signal is less than or equal to the preset value of output voltage of said additional winding 2000; Load circuit 103 short circuits are described; Judge that submodule 2001 sends short-circuit signals to control module 200, after control module 200 receives this short-circuit signal, control electronic switch 101 immediately and break off being connected of said input source 100 and transformer 102.
In general, the preset value of the output voltage of said additional winding 2000 can be when load circuit 103 operate as normal, and the actual output voltage of said additional winding 2000 is handled the resulting galvanic current pressure value in back through commutator module 2003.
In addition; When said sampling submodule 2002 is used to sample the actual output current of said additional winding 2000; Because the input voltage of primary winding 1021 is an 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; Judge that in order to make submodule 2001 can judge whether short circuit of load circuit 103 comparatively exactly, the actual output current that needs to add winding 2000 changes dc current signal into, then the sampling filter submodule 2002 AC signal input rectifying submodule 2003 of oneself additional winding 2000 of will sample; After the rectification processing through commutator module 2003, AC signal is converted into dc current signal.Judge that submodule 2001 can compare the preset value of the output current of this dc current signal and said additional winding 2000; When this dc current signal during less than the preset value of the output current of said additional winding 2000; Judgement submodule 2001 is not outwards exported signal; And, load circuit 103 short circuits are described when this dc current signal during more than or equal to the preset value of the output current of said additional winding 2000, judge that submodule 2001 sends short-circuit signals to control module 201; After control module 201 receives this short-circuit signal, control electronic switch 101 immediately and quit work to break off being connected of said input source 100 and transformer 102.
In the technical scheme of present embodiment; A kind of short-circuit protection method of isolated power converter is provided; When the load circuit short circuit of said isolated power converter; The short-circuit detecting module can detect the load circuit short circuit of said isolated power converter rapidly, and sends short-circuit signal to said control module, after said control module receives short-circuit signal; Can control said electronic switch immediately and break off being connected between said input source and the transformer; Realize rapidly said isolated power converter protection, greatly reduce that big electric current that the comparatively accurate electronic switch of the input of said isolated power converter crossed by transient flow punctures and the possibility that lost efficacy, reduced the maintenance cost of isolated power converter.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, 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 said claim.
Claims (7)
1. the short circuit protection system of an isolated power converter; Said isolated power converter comprises: input source, electronic switch and the transformer that is connected with said input source through said electronic switch; It is characterized in that the short circuit protection system of said isolated power converter comprises:
The short-circuit detecting module is used for when detecting the load circuit short circuit of said isolated power converter, sends short-circuit signal to control module;
Control module when the short-circuit signal that receives from said short-circuit detecting module, is controlled said electronic switch and is broken off being connected of said transformer and said input source.
2. system according to claim 1 is characterized in that, also comprises:
Said short-circuit detecting module comprises:
Be arranged at the former limit of said transformer or the additional winding of secondary;
Judge submodule,
Be used for when the actual output voltage of judging said additional winding is less than or equal to the preset value of output voltage of said additional winding, sending short-circuit signal to said control module;
Or
Be used for sending short-circuit signal to said control module when the actual output current of judging said additional winding during more than or equal to the preset value of the output current of said additional winding.
3. system according to claim 2 is characterized in that,
When said additional winding was arranged at the former limit of said transformer, an end of said additional winding and the former limit of said transformer were altogether.
4. system according to claim 2 is characterized in that,
When said additional winding was arranged at the secondary of said transformer, an end of said additional winding and the secondary of said transformer were altogether.
5. the short-circuit protection method of an isolated power converter, said isolated power converter comprises: input source, electronic switch and through said electronic switch and the transformer that said input source is connected is characterized in that said method comprises:
When the short-circuit detecting module detects the load circuit short circuit of said isolated power converter, send short-circuit signal to control module;
When control module receives the short-circuit signal from said short-circuit detecting module, control said electronic switch and break off being connected of said transformer and said input source.
6. method according to claim 5 is characterized in that, when the short-circuit detecting module detects the load circuit short circuit of said isolated power converter, sends short-circuit signal to control module and is specially:
When judging that submodule judges that the actual output voltage of said additional winding is less than or equal to the preset value of output voltage of said additional winding, send short-circuit signal to said control module.
7. method according to claim 5 is characterized in that, when the short-circuit detecting module detects the load circuit short circuit of said isolated power converter, sends short-circuit signal to control module and is specially:
When judging actual output current that submodule is judged said additional winding, send short-circuit signal to said control module more than or equal to the preset value of the output current of said additional winding.
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| CN102611079B (en) | 2015-01-21 |
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