CN105763059A - Power supply unit with current correction function - Google Patents
Power supply unit with current correction function Download PDFInfo
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- CN105763059A CN105763059A CN201410781114.4A CN201410781114A CN105763059A CN 105763059 A CN105763059 A CN 105763059A CN 201410781114 A CN201410781114 A CN 201410781114A CN 105763059 A CN105763059 A CN 105763059A
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Abstract
The present invention provides a power supply unit with a current correction function. According to the power supply unit, input current is measured through a current transformer, at the same time, output current is measured through an OR operation field effect transistor and a current measurement unit, the adaptive adjustment is carried out through the input current measured by a first adjustment unit, the adaptive adjustment of the output current is carried out through a second adjustment unit, further the input and output current adjusted by the first adjustment unit and the second adjustment unit are integrated through a microprocessing unit according to a switch state, and a current measurement signal is generated, thus the measurement error of the current transformer which is generated due to the switch state and the measurement error of the field effect transistor which is generated due to a temperature change are avoided, and a measuring resistor is not arranged so as to reduce power loss.
Description
Technical field
The present invention provides a kind of power supply unit, espespecially a kind of power supply unit having electric current debugging functions.
Background technology
Refer to shown in Fig. 5, it is that a current transformer (CurrentTransformer) 21 is arranged at the input of this power supply unit 20 that its input current of power supply unit 20 of prior art measures mode, detects input current (I by the coupling of this current transformer 21CT).But when using the input current that this current transformer 21 measures this power supply unit 20, the switch switching state of a bridge converter 22 of this power supply unit 20 input can affect the measurement result of this current transformer 21.For example, when the load condition of this power supply unit 20 outfan is underloading, the switch switching state of this bridge converter 22 is direct-cut operation, and when direct-cut operation, the back coupling value of this current transformer 21 can be affected, and causes the generation of surging, causes the error of current measurement result.
On the other hand, the output current of the power supply unit 20 of prior art is surveyed mode and is adopted a measurement resistance R to be series at the outfan of this power supply unit 20, by detecting the cross-pressure at this measurement resistance R two ends, cross-pressure converts output electric current I toR.But owing to this detection resistance R is series at the outfan of this power supply unit 20, constantly there is output electric current to flow through this detection resistance R and cause extra electric energy loss, cause waste of energy.Therefore the current measurement technology of the power supply unit 20 of prior art certainly will do further improvement.
Summary of the invention
The current measurement practice of existing power supply supply affects because can be switched state by the switch of bridge converter, cause measuring result error, and the shortcoming that series connection measurement resistance makes electric energy loss that can be extra, present invention is primarily intended to provide a kind of power supply unit having electric current debugging functions, accuracy of measurement can be improved and reduce extra electric energy loss.
For reaching above-mentioned purpose, the present invention has the power supply unit of electric current debugging functions and includes:
One bridge converter, has a direct-flow input end and an ac output end；
One transformator, has a primary side and a secondary side, and this primary side is connected to the ac output end of this bridge converter；
One commutator, has an ac input end and a DC output end, and this ac input end is connected to the secondary side of this transformator；
One current transformer, is connected to the direct-flow input end of this bridge converter, to detect the input current of this bridge converter, and exports an input current signal；
One first adjustment unit, is connected to this current transformer, after receiving this input current signal, after this input current signal being multiplied by one first multiplying power and adjusting plus one first offset, exports one first current signal；
One or computing field-effect transistor (OringFET), it is connected to the DC output end of this commutator；
One current measurement unit, in parallel with this or computing field-effect transistor, with the cross-pressure according to this or computing field-effect transistor, detect the output electric current of this commutator, and export an output current signal；
One second adjustment unit, is connected to this current measurement unit, to receive this output current signal, and this output current signal is multiplied by one second multiplying power and plus output one second current signal after one second offset；
One microprocessing unit, is connected to this first adjustment unit and this second adjustment unit, to receive this first current signal and this second current signal, and produces a current measurement signal according to this；
Wherein this microprocessing unit is preset with one first electric current interval and one second electric current interval, this current value corresponding to the first electric current interval is less than the current value corresponding to this second Current Zone, and when the current value corresponding to the first current signal or this second current signal falls within this first electric current interval, this current measurement signal is equal to this second current signal, and when the current value size corresponding to this first current signal or this second current signal falls within this second electric current interval, this current measurement signal is equal to this first current signal.
The present invention also provides for a kind of power supply unit having electric current debugging functions, and described power supply unit includes:
One bridge converter, has a direct-flow input end and an ac output end；
One transformator, has a primary side and a secondary side, and described primary side is connected to the ac output end of described bridge converter；
One commutator, has an ac input end and a DC output end, and described ac input end is connected to the secondary side of described transformator；
One current transformer, is connected to the direct-flow input end of described bridge converter, to detect the input current of described bridge converter, and exports an input current signal；
One first adjustment unit, is connected to described current transformer, after receiving described input current signal, after described input current signal being multiplied by one first multiplying power and adjusting plus one first offset, exports one first current signal；
One or computing field-effect transistor, it is connected to the DC output end of described commutator；
One current measurement unit, with described or computing field-effect transistor is in parallel, according to described or computing field-effect transistor cross-pressure, to detect the output electric current of described commutator, and to export an output current signal；
One second adjustment unit, is connected to described current measurement unit, to receive described output current signal, and described output current signal is multiplied by one second multiplying power and plus output one second current signal after one second offset；
One microprocessing unit, is connected to described first adjustment unit and described second adjustment unit, to receive described first current signal and described second current signal, and produces current measurement signal described according to this；
Wherein said microprocessing unit is preset with one first difference and one second difference；When the current value corresponding to described first current signal is more than the current value corresponding to described second current signal, and difference more than described first difference time, described current measurement signal be equal to described first current signal；When the current value corresponding to described second current signal is more than the current value corresponding to described first current signal, and difference more than described second difference time, described current measurement signal be equal to described second current signal.
The present invention also provides for a kind of power supply unit having electric current debugging functions, and described power supply unit includes:
One bridge converter, has a direct-flow input end and an ac output end；
One transformator, has a primary side and a secondary side, and described primary side is connected to the ac output end of described bridge converter；
One commutator, has an ac input end and a DC output end, and described ac input end is connected to the secondary side of described transformator；
One current transformer, is connected to the direct-flow input end of described bridge converter, to detect the input current of described bridge converter, and exports an input current signal；
One first adjustment unit, is connected to described current transformer, after receiving described input current signal, after described input current signal being multiplied by one first multiplying power and adjusting plus one first offset, exports one first current signal；
One or computing field-effect transistor, it is connected to the DC output end of described commutator；
One current measurement unit, with described or computing field-effect transistor is in parallel, according to described or computing field-effect transistor cross-pressure, to detect the output electric current of described commutator, and to export an output current signal；
One second adjustment unit, is connected to described current measurement unit, to receive described output current signal, and described output current signal is multiplied by one second multiplying power and plus output one second current signal after one second offset；
One microprocessing unit, is connected to described first adjustment unit and described second adjustment unit, to receive described first current signal and described second current signal, and produces current measurement signal described according to this；
Wherein said microprocessing unit constantly compares the size of the current value corresponding to described first current signal and the current value corresponding to described second current signal, takes minima as the current value corresponding to described current measurement signal.
The present invention detects this input current signal by this current transformer simultaneously, and this current measurement unit detects this output current signal, produce this first current signal and this second current signal respectively through after multiplying power adjustment and compensation, and produce this current measurement signal according to this.Wherein when this first current signal or this second current signal fall within this first electric current interval, adopt this second current signal as this current measurement signal, and when this first current signal or this second current signal fall within this second electric current interval, adopt this first current signal as this current measurement signal.
When the current value corresponding to this first current signal or this second current signal falls within this first electric current interval, the switch switching state of this bridge converter is direct-cut operation, the load representing the power supply unit adopting current measurement circuit of the present invention is in light condition, and this first current signal produces according to the detection of this current transformer, but this bridge converter is when direct-cut operation, the back coupling value of this current transformer can be affected, and causes the generation of surging, causes the error of measurement result.Therefore when this bridge converter is in direct-cut operation, this current measurement unit is adopted to detect the cross-pressure of this or computing field-effect transistor and the second current signal of producing is as this current measurement signal, to avoid the error that this current transformer produces to affect measurement result.
But when the current value corresponding to this first current signal or this second current signal falls within this second electric current interval, the on off state of this bridge converter is soft switching, the load representing the power supply unit adopting current measurement circuit of the present invention is in heavy condition, cause the raising of outfan temperature, have impact on the measurement result measuring this or computing field-effect transistor of this current measurement unit, therefore in this bridge converter in soft switching time, the first current signal adopting this current transformer to detect and to produce is as this current measurement signal, to avoid temperature to affect measurement result.
And the present invention in outfan by measuring the cross-pressure of this or computing field-effect transistor, obtain the second current signal, and should or computing field-effect transistor be the power supply unit necessary element when doing application in parallel, therefore the present invention is not additionally provided with a measurement resistance and carrys out the current value of measure output end, original element in power supply unit is adopted to reach the purpose of current detecting, with further economization electric energy loss.
The present invention is by judging this first current signal or this current value size corresponding to the second current signal, when falling within this first electric current interval or this second electric current interval, it is respectively adopted different current detection signals, not only avoid the measuring result error that switching mode causes, avoid the measuring result error that temperature causes simultaneously, to get rid of measurement error further, reach and lead raising current measurement accuracy, and reduce the purpose of extra electric energy loss.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of present pre-ferred embodiments.
Fig. 2 A, Fig. 2 B, Fig. 2 C are the current measurement signal graph of relation with output current value of this novel preferred embodiment.
Fig. 3 is the flow chart that this novel preferred embodiment judges the switch switching state of this bridge converter.
Fig. 4 A, Fig. 4 B, Fig. 4 C are the current measurement signal graph of relation with output current value of this novel preferred embodiment.
Fig. 5 is the circuit block diagram of existing power supply supply current detection circuit.
Drawing reference numeral
The power supply unit of 10 tool electric current debugging functions
11 bridge converter 111 direct-flow input ends
112 ac output ends
12 transformator 121 primary sides
122 secondary sides
13 commutator 131 ac input ends
132 DC output ends
14 current transformers
15 first adjustment units
16 or computing field-effect transistor
17 current measurement unit
18 second adjustment units
19 microprocessing units
191 control units
20 power supply unit 21 current transformers
22 bridge converter
Detailed description of the invention
Hereinafter coordinate accompanying drawing and present pre-ferred embodiments, the present invention is expanded on further and reaches the technological means that predetermined goal of the invention is taked.
Refer to shown in Fig. 1, the present invention is the power supply unit 10 of tool electric current debugging functions, and the power supply unit 10 of these tool electric current debugging functions includes bridge converter 11, transformator 12, commutator 13, current transformer (CurrentTransformer) 14,1 first adjustment unit 15, one or computing field-effect transistor (OringFET) 16, output current surveys unit 17,1 second adjustment unit 18 and a microprocessing unit 19.Should or computing field-effect transistor 16 identical with general field-effect transistor, but because of its application scenario and occupation mode be or the mode of computing is so spy is called or computing field-effect transistor 16.This bridge converter 11 is a phase-shift type full-bridge converters or a semi-bridge convertor, in this preferred embodiment, is illustrate for phase-shift type full-bridge converters.
This bridge converter 11 has direct-flow input end 111 and an ac output end 112.This transformator 12 has primary side 121 and a secondary side 122, and this primary side 121 is connected to the ac output end 112 of this bridge converter 11.This commutator 13 has ac input end 131 and a DC output end 132, and this ac input end 131 is connected to the secondary side 122 of this transformator 12.
This current transformer 14 connects the direct-flow input end 111 of bridge converter 11, to detect the input current of this bridge converter 11, and exports an input current signal.This first adjustment unit 15 is connected to this current transformer 14, to receive this input current signal, and this input current signal is multiplied by one first multiplying power and plus, after one first offset, exporting one first current signal S1.
This or computing field-effect transistor 16 are connected to the DC output end 132 of this commutator 13.This current measurement unit 17 is in parallel with this or computing field-effect transistor 16, with the cross-pressure according to this or computing field-effect transistor 16, detects the output electric current of this commutator 13, and exports an output current signal.This second adjustment unit 18 is connected to this current measurement unit 17, to receive this output current signal, and this output current signal is multiplied by one second multiplying power and plus, after one second offset, exporting one second current signal S2.
This microprocessing unit 19 is connected to the outfan of this first adjustment unit 15 and this second adjustment unit 18, and receives this first current signal S1 and this second current signal S2, exports a current measurement signal S3 according to this.Seeing also shown in Fig. 2 A, Fig. 2 B, this microprocessing unit 19 is preset with one first electric current interval and one second electric current is interval, and this current value corresponding to the first electric current interval is less than the current value corresponding to this second electric current interval.When the current value corresponding to this first current signal S1 or this second current signal S2 falls within this first electric current interval, namely the switch switching state of this bridge converter 11 is direct-cut operation, load when being underloading, this current measurement signal S3 is equal to this second current signal S2, the namely I in Fig. 2 AOringCurve, and when the current value corresponding to this first current signal S1 or this second current signal S2 falls within this second electric current interval, namely the switch switching state of this bridge converter 11 is that soft switching, load are for time heavily loaded, this current measurement signal S3 is equal to this first current signal S1, the namely I in Fig. 2 ACTCurve.In sum, the I in this current measurement signal S3 i.e. Fig. 2 BdetectCurve.In this preferred embodiment, this microprocessing unit 19 is preset with a marginal value further, and this current value corresponding to the first electric current interval is less than this marginal value, and this current value corresponding to the second electric current interval is more than or equal to this marginal value.
The present invention is by detecting the input current of this bridge converter 11 and the output electric current of this commutator 13 simultaneously, and the switch according to this bridge converter 11 switches this current measurement signal of Determines, to guarantee the accuracy of the current signal measured, it is to avoid the change of other parameters affects measurement result.
When the current value corresponding to this first current signal S1 or this second current signal S2 falls within this first electric current interval, this bridge converter 11 is made to operate in the direct-cut operation stage, namely when the load of this power supply unit is underloading, because actual output current IOUTIt is directly proportional to the loading level of this power supply unit, and this first current signal S1 or this second current signal S2 and this actual output current IOUTIt is proportionate.When this first current signal S1 or this second current signal S2 is less than this marginal value, when namely falling within this first electric current interval, this current transformer 14 because this bridge converter 11 is in direct-cut operation state, can cause the testing result error of current transformer 14.In this first electric current interval, the measurement result of this current transformer 14 is after this first adjustment unit 15 adjusts, in Fig. 2 C shown in dotted line, i.e. and ICTCurve, the surging that can cause because of direct-cut operation so that the input current that detection obtains changes, therefore cannot adopt the testing result of this current transformer 14 under direct-cut operation state.But the output electric current that this current measurement unit 17 detects can't be subject to the switch switching state impact of this bridge converter 11, can detect actual output current I exactlyOUT.Therefore when this bridge converter 11 is in direct-cut operation, adopt the second current signal S2, i.e. I produced by the second adjustment unit 18OringCurve, as this current measurement signal S3, using as current measurement result, it is to avoid the impact of the switch switching state of this bridge converter 11 and the error that causes.
When the current value corresponding to this first current signal S1 or this second current signal S2 falls within this second electric current interval, this bridge converter 11 is made to operate in soft switch step, now, the measurement result of this current transformer 14 is then closer to actual input current, can react input current exactly.But the output electric current that this current measurement unit 17 detects according to should or the cross-pressure of computing field-effect transistor 16 and conduction impedance thereof calculate generation, and the conduction impedance according to this or computing field-effect transistor 16 can be affected by temperature, therefore when this second current signal S2 is more than this marginal value, when namely falling within this second electric current interval, this actual output current IOUTS2 can be increased along with this second current signal and increase, and load also can increase the weight of therewith, the temperature making load end rises, and then causes that the temperature of this or computing field-effect transistor 16 increases so that should or the measurement result of computing field-effect transistor 16 and actual output current IOUTBetween error also can be more big.Therefore when the current value corresponding to this first current signal S1 or this second current signal S2 falls within this second electric current interval, adopt this current transformer 14 by the first current signal S1, i.e. I produced by this first adjustment unit 15CTCurve, as this current measurement signal S3, using as this current measurement result, it is to avoid should or computing field-effect transistor 16 error that is influenced by temperature and causes.In sum, this current measurement signal S3 equivalent this second current signal S2, i.e. I under direct-cut operation stateOringCurve, equivalent this first current signal S1, i.e. I under soft switching stateCTCurve, therefore this current measurement signal S3 is IdetectCurve.Additionally, the present invention by this current transformer 14 and should or computing field-effect transistor 16 detect input, output electric current, and be not provided with detect resistance, use saving electric energy loss.
Effect as this first adjustment unit 15 is that the input current signal that this current transformer 14 detects does adaptive formula adjustment, and the output current signal that the effect of this second adjustment unit 18 detects by this current measurement unit 17 does adaptive formula adjustment.For example, when user needs the output current value learning this power supply unit, this first adjustment unit 15 is by this first multiplying power and this first offset, input current value corresponding for input current signal detected by this current transformer 14 is matched to output current value, to produce this first current signal, and this second current signal is this output current value corresponding to output current signal measured by current measurement unit 17, use unified benchmark, current measurement signal S3 produced by this microprocessing unit 19 is made to be equal to output current signal, for user.That is, when user needs the output current value learning this power supply unit, because adjust voltage by this transformator 12 between the input current of this power supply unit and output electric current, and the turn ratio of this transformator is N1:N2, therefore the input current I of this power supply unitINWith output electric current IOUTBetween relation be:
Wherein this IoffsetFor the error compensation that the loss of transmitting procedure produces, therefore the input current detected is multiplied by by this current transformer 14 this first multiplying power (N1/N2), adds this first offset (Ioffset), the input current detected by this current transformer 14 can be matched to output electric current for this microprocessing unit 19.
Otherwise, when user needs the input current value detecting this power supply unit, in like manner can learn, this second adjustment unit 18 is by this second multiplying power and this second offset, output current value corresponding for output current signal measured by this current measurement unit 17 is matched to input current value, to unify benchmark, current measurement signal S3 produced by this microprocessing unit 19 is made to be equal to input current signal, for user.
And current measurement signal S3 produced by this microprocessing unit 19 is sent to a control unit 191 electrically connected with this microprocessing unit 19, this bridge converter 11 is carried out the adjustment of on-off control by this control unit 191 according to this current measurement signal S3, makes the conversion efficiency of this power supply unit 10 reach optimization.
Referring to shown in Fig. 2 C, it is interval that this microprocessing unit 19 is preset with one first fiducial value, one second fiducial value and one the 3rd electric current further, and the 3rd electric current is interval between this first electric current interval and this second electric current interval.This current value corresponding to the first electric current interval is less than this first fiducial value, and this current value corresponding to the second electric current interval is more than this second fiducial value, and the current value corresponding to the 3rd electric current interval is between this first fiducial value and this second fiducial value.When this first current signal S1 or this second current signal S2 is less than this first fiducial value, namely fall within this first electric current interval, using this second current signal S2 as this current measurement signal S3.When this first current signal S1 or this second current signal S2 is more than this second fiducial value, namely fall within this second electric current interval, using this first current signal S1 as this current measurement signal S3.When this first current signal S1 or this second current signal S2 is between this first fiducial value and this second fiducial value, namely the 3rd electric current is fallen within interval, constantly compare this first current signal S1 and the size of this second current signal S2, and take minima as this current measurement signal S3.In sum, the I in this current measurement signal S3 i.e. Fig. 2 BdetectCurve.In this preferred embodiment, this microprocessing unit 19 is only when current value corresponding to this first current signal S1 or this second current signal is between this first fiducial value and this second fiducial value, just compare the computing of size, use the operand reducing this microprocessing unit 19.
For example, when the current value corresponding to this second current signal S2 is equal to this second fiducial value, P2 such as Fig. 2 C, the relatively size of this first current signal S1 and the current value corresponding to this second current signal S2, the P2 of the current value such as Fig. 2 C corresponding to this second current signal S2, and the P1 of the current value such as Fig. 2 C corresponding to this first current signal S1, now, current value corresponding to this first current signal S1 is less than the current value corresponding to this second current signal S2, therefore, current value using the current value corresponding to this first current signal as this current measurement signal S3.
See also shown in Fig. 3, it is judged that the 3rd preferred embodiment of the switch switching state of this bridge converter 11 is performed following steps by this microprocessing unit 19:
Judge the size S11 of this first current signal or this second current signal；
When this first current signal or this second current signal are less than first fiducial value, using this second current signal as this current measurement signal S12；
When this first current signal or this second current signal are more than second fiducial value, using this first current signal as this current measurement signal S13；And
When this first current signal and this second current signal are more than this first fiducial value and less than this second fiducial value, constantly compare the size of this first current signal and this second current signal, and take minima as this current measurement signal S14.
Additionally, when the on off state of this bridge converter 11 is direct-cut operation, this signal measured by current transformer 14 because the generation of surging, can cause that the current value corresponding to the signal recorded is more than actually entering current value.And when the on off state of this bridge converter 11 is soft switching, it is somebody's turn to do or the conduction impedance of computing field-effect transistor 16 is that the electric current that heavy duty flows through increases because of load, temperature is made to promote, cause the increase of conduction impedance, allow this current value corresponding to signal measured by current measurement unit 17 more than actual output current value.
Therefore, this microprocessing unit 19 also can pass through constantly to compare the size of this first current signal S1 and this second current signal S2, and takes minima as this current measurement signal S3.And this current measurement signal S3 is the I shown in Fig. 2 BdetectCurve.
Referring to shown in Fig. 4 A, Fig. 4 B, Fig. 4 C, this microprocessing unit 19 judges that the 4th preferred embodiment of the switch switching state of this bridge converter 11 is preset with one first difference DELTA 1 and one second difference DELTA 2.When this first current signal S1 is more than this second current signal S2, and difference more than this first difference DELTA 1 time, using this second current signal S2 as this current measurement signal S3.When this second current signal S2 is more than this first current signal S1, and difference more than this second difference DELTA 2 time, using this first current signal S1 as this current measurement signal S3, and the original state of this current measurement signal S3 is set as equivalent this second current signal S2.Setting by this first difference DELTA 1 and this second difference DELTA 2, it is to avoid the number of times that this microprocessing unit 19 switches this current measurement signal is excessively frequent, causes Circuits System unstable.
For example, as shown in Figure 4 A, this first current signal S1 is ICT curve, and this second current signal is IOringCurve, as actual output current (IOUT) when increasing by 0, under original state, this current measurement signal S3 is equal to this second current signal S2, and this first current signal S1 is more than this second current signal S2, and more than this first difference DELTA 1, but along with actual output current (IOUT) be continuously increased, the difference of this first current signal S1 and this second current signal S2 also becomes closer to, and further in turn by this second current signal S2 more than this first current signal S1, when this second current signal S2 is more than this first current signal S1, and difference more than this second difference DELTA 2 time, just make this current measurement signal S3 be equal to this first current signal S1.Learnt by foregoing, as this actual output current (IOUT) by 0 increase to maximum time, the I in change curve such as Fig. 4 B of this current measurement signal S3detect1Curve.In like manner can learn, as actual output current (IOUT) by maximum reduce to 0 time, the I in change curve such as Fig. 4 C of this current measurement signal S3detect2Curve.
The above is only presently preferred embodiments of the present invention, not the present invention is done any pro forma restriction, although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention, relevant technical staff in the field, without departing from the scope of technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solution of the present invention, according to any simple modification that above example is made by the technical spirit of the present invention, equivalent variations and modification, all still fall within the scope of technical solution of the present invention.
Claims (8)
1. the power supply unit having electric current debugging functions, it is characterised in that described power supply unit includes:
One bridge converter, has a direct-flow input end and an ac output end；
One transformator, has a primary side and a secondary side, and described primary side is connected to the ac output end of described bridge converter；
One commutator, has an ac input end and a DC output end, and described ac input end is connected to the secondary side of described transformator；
One current transformer, is connected to the direct-flow input end of described bridge converter, to detect the input current of described bridge converter, and exports an input current signal；
One first adjustment unit, is connected to described current transformer, after receiving described input current signal, after described input current signal being multiplied by one first multiplying power and adjusting plus one first offset, exports one first current signal；
One or computing field-effect transistor, it is connected to the DC output end of described commutator；
One current measurement unit, with described or computing field-effect transistor is in parallel, according to described or computing field-effect transistor cross-pressure, to detect the output electric current of described commutator, and to export an output current signal；
One second adjustment unit, is connected to described current measurement unit, to receive described output current signal, and described output current signal is multiplied by one second multiplying power and plus output one second current signal after one second offset；
One microprocessing unit, is connected to described first adjustment unit and described second adjustment unit, to receive described first current signal and described second current signal, and produces a current measurement signal according to this；
It is interval interval with one second electric current that wherein said microprocessing unit is preset with one first electric current, current value corresponding to described first electric current interval is less than the current value corresponding to described second Current Zone, and when the current value corresponding to the first current signal or described second current signal falls within described first electric current interval, described current measurement signal is equal to described second current signal, and when the current value size corresponding to described first current signal or described second current signal falls within described second electric current interval, described current measurement signal is equal to described first current signal.
2. have the power supply unit of electric current debugging functions according to claim 1, it is characterized in that, described microprocessing unit is preset with a marginal value, current value corresponding to described first electric current interval is less than described marginal value, and the current value corresponding to described second electric current interval is more than or equal to described marginal value.
3. have the power supply unit of electric current debugging functions according to claim 1, it is characterised in that described microprocessing unit is preset with one first fiducial value and one second fiducial value further and one the 3rd electric current is interval；
Described first fiducial value is less than described second fiducial value；
Current value corresponding to described first electric current interval is less than described first fiducial value；
Current value corresponding to described second electric current interval is more than described second fiducial value；
Current value corresponding to described 3rd electric current interval is between described first fiducial value and described second fiducial value；
When the current value corresponding to described first current signal or described second current signal falls within described 3rd electric current interval, constantly compare the size of the current value corresponding to described first current signal and the current value corresponding to described second current signal, and take minima therein as the current value corresponding to described current measurement signal.
4. according to any one of claims 1 to 3, has the power supply unit of electric current debugging functions, it is characterised in that described bridge converter is a phase-shift type full-bridge converters or a semi-bridge convertor.
5. the power supply unit having electric current debugging functions, it is characterised in that described power supply unit includes:
One bridge converter, has a direct-flow input end and an ac output end；
One transformator, has a primary side and a secondary side, and described primary side is connected to the ac output end of described bridge converter；
One commutator, has an ac input end and a DC output end, and described ac input end is connected to the secondary side of described transformator；
One current transformer, is connected to the direct-flow input end of described bridge converter, to detect the input current of described bridge converter, and exports an input current signal；
One first adjustment unit, is connected to described current transformer, after receiving described input current signal, after described input current signal being multiplied by one first multiplying power and adjusting plus one first offset, exports one first current signal；
One or computing field-effect transistor, it is connected to the DC output end of described commutator；
One current measurement unit, with described or computing field-effect transistor is in parallel, according to described or computing field-effect transistor cross-pressure, to detect the output electric current of described commutator, and to export an output current signal；
One second adjustment unit, is connected to described current measurement unit, to receive described output current signal, and described output current signal is multiplied by one second multiplying power and plus output one second current signal after one second offset；
One microprocessing unit, is connected to described first adjustment unit and described second adjustment unit, to receive described first current signal and described second current signal, and produces current measurement signal described according to this；
Wherein said microprocessing unit is preset with one first difference and one second difference；When the current value corresponding to described first current signal is more than the current value corresponding to described second current signal, and difference more than described first difference time, described current measurement signal be equal to described first current signal；When the current value corresponding to described second current signal is more than the current value corresponding to described first current signal, and difference more than described second difference time, described current measurement signal be equal to described second current signal.
6. have the power supply unit of electric current debugging functions according to claim 5, it is characterised in that described bridge converter is a phase-shift type full-bridge converters or a semi-bridge convertor.
7. the power supply unit having electric current debugging functions, it is characterised in that described power supply unit includes:
One bridge converter, has a direct-flow input end and an ac output end；
One transformator, has a primary side and a secondary side, and described primary side is connected to the ac output end of described bridge converter；
One commutator, has an ac input end and a DC output end, and described ac input end is connected to the secondary side of described transformator；
One current transformer, is connected to the direct-flow input end of described bridge converter, to detect the input current of described bridge converter, and exports an input current signal；
One first adjustment unit, is connected to described current transformer, after receiving described input current signal, after described input current signal being multiplied by one first multiplying power and adjusting plus one first offset, exports one first current signal；
One or computing field-effect transistor, it is connected to the DC output end of described commutator；
One current measurement unit, with described or computing field-effect transistor is in parallel, according to described or computing field-effect transistor cross-pressure, to detect the output electric current of described commutator, and to export an output current signal；
One second adjustment unit, is connected to described current measurement unit, to receive described output current signal, and described output current signal is multiplied by one second multiplying power and plus output one second current signal after one second offset；
One microprocessing unit, is connected to described first adjustment unit and described second adjustment unit, to receive described first current signal and described second current signal, and produces current measurement signal described according to this；
Wherein said microprocessing unit constantly compares the size of the current value corresponding to described first current signal and the current value corresponding to described second current signal, takes minima as the current value corresponding to described current measurement signal.
8. have the power supply unit of electric current debugging functions according to claim 7, it is characterised in that described bridge converter is a phase-shift type full-bridge converters or a semi-bridge convertor.
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| CN201410781114.4A CN105763059B (en) | 2014-12-16 | 2014-12-16 | Has the power supply unit of electric current debugging functions |
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| CN102364858A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
| TW201336220A (en) * | 2012-02-29 | 2013-09-01 | Acbel Polytech Inc | Switching power supply and control method thereof |
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| US20140198538A1 (en) * | 2013-01-16 | 2014-07-17 | Nippon Soken, Inc. | Power converter with current feedback loop |
| US20140268950A1 (en) * | 2013-03-13 | 2014-09-18 | Infineon Technologies Austria Ag | System and Method for Calibrating a Power Supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102364858A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Constant-current switching power supply controller capable of controlling through primary side and method |
| TW201336220A (en) * | 2012-02-29 | 2013-09-01 | Acbel Polytech Inc | Switching power supply and control method thereof |
| US20140198538A1 (en) * | 2013-01-16 | 2014-07-17 | Nippon Soken, Inc. | Power converter with current feedback loop |
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