CN101707441A - Totem-pole bridgeless circuit system and current sampling device - Google Patents
Totem-pole bridgeless circuit system and current sampling device Download PDFInfo
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- CN101707441A CN101707441A CN200910246713A CN200910246713A CN101707441A CN 101707441 A CN101707441 A CN 101707441A CN 200910246713 A CN200910246713 A CN 200910246713A CN 200910246713 A CN200910246713 A CN 200910246713A CN 101707441 A CN101707441 A CN 101707441A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The embodiment of the invention discloses a totem-pole bridgeless circuit system and a current sampling device, and is applied in the technical field of electricity supply. The circuit system comprises a switch control unit, a second bridge arm unit and two current sampling units added in the bridge unit, wherein the switching on/off of a first switching tube and a second switching tube in the second bridge arm unit are respectively controlled by the current sampled by the switch control unit through a first current sampling unit and a second current sampling unit. Compared with the prior art, the switching on/off of the switching tubes is controlled by the current sampled by the current sampling unit in the system, the difficulty on controlling the switching tube in the totem-pole bridgeless circuit system is reduced, and the utilization ratio of the totem-pole bridgeless circuit system is improved.
Description
Technical field
The present invention relates to the power supply technique field, particularly totem-pole bridgeless circuit system and current sampling device.
Background technology
In electric power system, the conversion efficiency of power supply is important, and power efficient converting system of the prior art has Bridgeless power factor to correct (PFC) Circuits System and resonant circuit (LLC) system etc.And totem Bridgeless boost transfer circuit system (hereinafter to be referred as totem-pole bridgeless circuit system) is a kind of of non-bridge PFC circuits system, as shown in Figure 1, in totem Bridgeless boost transfer circuit system: connection parallel with one another between first bridge arm unit, second bridge arm unit and the capacitor C, and an end ground connection that connects; Diode D1 and D2 that two series aiding connections are arranged in first bridge arm unit; Switching tube S1 and S2 that two series aiding connections are arranged in second bridge arm unit; Between the tie point of the tie point of two diodes and two switching tubes, be connected with power supply AC and inductance L.
In the above-mentioned totem-pole bridgeless circuit system, when power supply AC input be the positive half cycle of alternating current the time, Closing Switch pipe S2, cut-off switch pipe S1, at this moment inductance L, switching tube S2, diode D2 constitute tank circuit, after the energy storage of inductance L is finished, Closing Switch pipe S1, cut-off switch pipe S2, at this moment inductance L, switching tube S1, diode D2 constitute continuous current circuit, discharge the energy on the inductance L; When power supply AC input be the negative half period of alternating current the time, Closing Switch pipe S1, cut-off switch pipe S2, at this moment diode D1, switching tube S1, inductance L constitute tank circuit, after the energy storage of inductance L is finished, Closing Switch pipe S2, cut-off switch pipe S1, at this moment diode D1, switching tube S2, inductance L constitute continuous current circuit, discharge the energy on the inductance L.
In the process that above-mentioned prior art is put into practice and studied, the present inventor finds:
In the existing totem transfer circuit system, need the sequential of control switch pipe S1 and S2, satisfy above-mentioned corresponding relation, totem-pole bridgeless circuit system just can normally move, and the control to switching tube is difficult in this system.
Summary of the invention
The embodiment of the invention provides totem-pole bridgeless circuit system and sample circuit system, reduce in the totem-pole bridgeless circuit system to switching tube closed with the control difficulty that disconnects, thereby improved the utilance of totem-pole bridgeless circuit system.
The embodiment of the invention provides a kind of totem-pole bridgeless circuit system, comprise: be connected in parallel in first and be connected in parallel a little and second first bridge arm unit and second bridge arm unit between being connected in parallel a little, comprise first diode and second diode of series aiding connection in described first bridge arm unit; First switching tube and the second switch pipe that comprise series aiding connection in described second bridge arm unit; Be connected with power supply and inductance between second tie point between first tie point between described two diodes and described two switching tubes, described system also comprises switch control unit, and described second bridge arm unit also comprises:
Two current sampling units, wherein first switching tube in first current sampling unit and described two switching tubes be series at described first be connected in parallel a little and second tie point between; Second switch pipe in second current sampling unit and described two switching tubes be series at described second be connected in parallel a little and second tie point between;
Described first current sampling unit is used for when described first switching tube is closed, and acquisition stream is crossed the electric current of described first switching tube; When described first switching tube disconnects, discharge the energy that described first current sampling unit is gathered;
So second current sampling unit is used for when described second switch pipe is closed, acquisition stream is crossed the electric current of described second switch pipe; When described second switch pipe disconnects, discharge the energy that described second current sampling unit is gathered;
Described switch control unit, be connected with the second switch pipe with described two current sampling units and first switching tube, be used for electric current, control the closed or disconnection of described first switching tube and described second switch pipe according to described first current sampling unit and the collection of described second current sampling unit.
The embodiment of the invention provides a kind of current sampling device, comprising:
Current transformer, two voltage stabilizing didoes, four diodes, sampling switch pipe and sampling resistors, described current transformer comprises former limit winding and secondary winding; Wherein:
Two described diode homopolarities are connected into the first sampling bridge; Two described diode homopolarities are connected into the second sampling bridge in addition, and in the described first sampling bridge and the second sampling bridge, the diode that one of them sampling bridge comprises is to link to each other with anode, and the diode that another sampling bridge comprises is to link to each other with negative electrode; And the described first sampling bridge and second bridge of sampling is connected in parallel with the two ends of described secondary winding respectively;
Two end points in addition of described two voltage stabilizing didoes of homopolarity series connection are connected with the two ends of described secondary winding respectively;
The two ends of described former limit winding be sampled circuit and be connected;
Be connected with between the homopolarity tie point of two diodes in the homopolarity tie point of two diodes and the described second sampling bridge in the described first sampling bridge and be described sampling switch pipe and the sampling resistor that is connected in series.
The embodiment of the invention provides a kind of current sampling device, comprising:
Current transformer, two voltage stabilizing didoes, two diodes, sampling switch pipe and sampling resistors; Described current transformer comprises former limit winding and is connected in two secondary windings of winding end points;
The former limit winding of described current transformer be sampled circuit and be connected;
Between the winding end points and another end points of the first secondary winding in described two secondary windings, have to be the described sampling resistor that is connected in series, described sampling switch pipe and a diode; Between two non-winding end points of described two secondary windings, have to be two described diodes that homopolarity is connected in series, and be parallel with and be described two voltage stabilizing didoes that homopolarity is connected in series.
As seen in the totem-pole bridgeless circuit system of the embodiment of the invention, comprise switch control unit, and two current sampling units in second bridge arm unit, have been increased, the electric current that described switch control unit is gathered by first current sampling unit and second current sampling unit, control the closed of first switching tube in second bridge arm unit and second switch pipe respectively or disconnect, compare with totem-pole bridgeless circuit system in the prior art, the system of the embodiment of the invention can come the disconnection or the closure of control switch pipe by the electric current of current sampling unit collection, reduced in the totem-pole bridgeless circuit system the difficulty of switch controlled, improved the utilance of totem-pole bridgeless circuit system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, 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 structural representation of totem transfer circuit system in the prior art;
Fig. 2 is the structural representation of the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 3 a is that a kind of current sampling unit works in the configuration state schematic diagram that forward current is gathered in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 3 b is that a kind of current sampling unit works in exergonic configuration state schematic diagram in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 3 c is that a kind of current sampling unit works in the configuration state schematic diagram that negative current is gathered in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 3 d is that a kind of current sampling unit works in another kind of exergonic configuration state schematic diagram in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 4 a is that another kind of current sampling unit works in the configuration state schematic diagram that forward current is gathered in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 4 b is that another kind of current sampling unit works in exergonic configuration state schematic diagram in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 4 c is that another kind of current sampling unit works in the configuration state schematic diagram that negative current is gathered in the totem-pole bridgeless circuit system that provides of the embodiment of the invention;
Fig. 4 d is that another kind of current sampling unit works in another kind of exergonic configuration state schematic diagram in the totem-pole bridgeless circuit system that provides of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
System embodiment one
A kind of totem-pole bridgeless circuit system, structural representation comprise as shown in Figure 2:
Be connected in parallel in first 1 and second be connected in parallel a little first bridge arm unit 10 between 2 and second bridge arm unit 20 that be connected in parallel a little, comprise the first diode D11 of series aiding connection and the D12 of second diode in described first bridge arm unit 10, promptly connect the negative electrode of the second diode D12 as the anode of the first diode D11 among the figure; First switching tube 211 and the second switch pipe 220 that comprise series aiding connection in described second bridge arm unit 20; Be connected with power supply AC1 and inductance L 1 between second tie point 3 between first tie point 4 between two diodes and two switching tubes, described system also comprises switch control unit 30, and second bridge arm unit 20 also comprises:
Two current sampling units, wherein first switching tube 211 in first current sampling unit 210 and described two switching tubes is series at described first and is connected in parallel a little between 1 and second tie point 3; Second switch pipe 220 in second current sampling unit 221 and described two switching tubes is series at described second and is connected in parallel a little between 2 and second tie point 3;
Described first current sampling unit 210 is used for when described first switching tube 211 is closed, and acquisition stream is crossed the electric current of described first switching tube 211; When described first switching tube 211 disconnects, discharge the energy that first current sampling unit 210 is gathered;
So second current sampling unit 221 is used for when described second switch pipe 220 is closed, acquisition stream is crossed the electric current of described second switch pipe 220; When described second switch pipe 220 disconnects, discharge the energy that second current sampling unit 221 is gathered;
Described switch control unit 30, be connected with second switch pipe 220 with described two current sampling units and first switching tube 211, be used for controlling the closed or disconnection of described first switching tube 211 and described second switch pipe 221 according to the electric current of described first current sampling unit 210 with 221 collections of described second current sampling unit.
Particularly, the current output terminal of first current sampling unit 210 and second current sampling unit 221 is connected with the control input end of switch control unit 30; And two control output ends of switch control unit 30 are connected with second switch pipe 220 with first switching tube 211 respectively, and the control end of first switching tube 211 is connected with the control end of current acquisition in first current sampling unit 210, like this when first switching tube closure or disconnection, 210 of first current sampling units are correspondingly gathered electric current or are released energy, and the control end of same second switch pipe 221 is connected with the control end of current acquisition in second current sampling unit 221.
Like this, the electric current of switch control unit 30 control input ends that output to according to the current output terminal of first current sampling unit 210 and second current sampling unit 221, closed or the disconnection of switch control unit 30 control switch pipes, as control first switching tube, 211 closures, then the signal of control switch pipe closure is exported to first open pipe 211 and first current sampling unit 210 by the control corresponding output, such first switching tube 211 can be closed after receiving signal, and first current sampling unit 210 can begin to carry out current sample after receiving signal.
Be appreciated that, here first current sampling unit 210 can be realized by identical method with second current sampling unit 221, as realizing by components and parts such as current transformers, like this, when power supply AC1 input be the positive half cycle of alternating current the time, closed second switch pipe 220, disconnection first switching tube 211, at this moment inductance L 1, second switch pipe 220, the second diode D12 and second current sampling unit 221 constitute tank circuit, and second current sampling unit, 221 acquisition stream are crossed the forward current of described second switch pipe 220; After the energy storage of inductance L 1 is finished, closed first switching tube 211, disconnection second switch pipe 220, at this moment inductance L 1, first switching tube 211, the second diode D12 and first current sampling unit 210 constitute continuous current circuit, discharge the energy on the inductance L 1, first current sampling unit, 210 meeting acquisition stream are crossed the forward current of described first switching tube 211 simultaneously, and second current sampling unit 221 can discharge the energy of gathering.
When power supply AC1 input be the negative half period of alternating current the time, closed first switching tube 211, disconnection second switch pipe 220, at this moment the first diode D11, first switching tube 211, inductance L 1 and first current sampling unit 210 constitute tank circuit, and first current sampling unit, 210 acquisition stream are crossed the negative current of first switching tube 211; When to inductance L 1 energy storage finish, closed second switch pipe 220, disconnection first switching tube 211, at this moment the first diode D11, second switch pipe 220, inductance L 1 and second current sampling unit 221 constitute continuous current circuit, discharge the energy on the inductance L 1, second current sampling unit, 221 meeting acquisition stream are crossed the negative current of second switch pipe 220 simultaneously, and first current sampling unit 210 can discharge the energy of gathering.
From the operation of foregoing circuit system as can be seen, when the forward of second current sampling unit 221 or negative sense reduce, need control second switch pipe 220 to disconnect first switching tube, 211 closures; When the electric current forward of first sampling unit 210 or negative sense reduce, need control first switching tube 211 to disconnect second switch pipe 220 closures.
To shown in Fig. 3 d, in a specific embodiment, first current sampling unit 210 and second current sampling unit 221 are realized in a like fashion, can comprise with reference to figure 3a:
Current transformer T, the voltage stabilizing didoe d5 that two homopolarities are interconnected and d6 (being that negative electrode is interconnected among the figure), four diode d1 are to d4, sampling switch pipe S and sampling resistor R, and described current transformer T comprises former limit winding and secondary winding;
Two described diode d1 and d3 homopolarity are connected into the first sampling bridge; In addition two described diode d2 and d4 homopolarity are connected into the second sampling bridge, and in the described first sampling bridge and the second sampling bridge, the diode that one of them sampling bridge comprises is to link to each other with anode, and the diode that another sampling bridge comprises is continuous with negative electrode; The d1 that the first sampling bridge comprises among the figure is to link to each other with negative electrode with d3, and the d2 that the second sampling bridge comprises is to link to each other with anode with d4;
The described first sampling bridge and second bridge of sampling is connected in parallel with the two ends a and the b of described secondary winding respectively; Described two voltage stabilizing didoe d5 are with after the d6 homopolarity is connected, in addition two ends promptly two anodes be connected with b with the two ends a of described secondary winding respectively;
The two ends c of described former limit winding and d are connected in described second bridge arm unit 20, be that the former limit winding and first switching tube 211 are series at first and are connected in parallel a little between 1 and second tie point 3, or and second switch pipe 220 be series at second and be connected in parallel a little between 2 and second tie point 3;
The homopolarity tie point 5 and described second of two diode d1 and d3 is sampled in the bridge to be connected with between the homopolarity tie point 6 of two diode d2 and d4 and is described sampling switch pipe S and the sampling resistor R that is connected in series in the described first sampling bridge.When sampling switch pipe S was closed, this current sampling unit can be gathered the electric current that flows through on the current transformer T like this, when closed, and the energy of release current instrument transformer T.
Described sampling resistor R is connected with switch control unit 30, when described sampling switch pipe S and first switching tube or second switch pipe closure, described current sampling unit is gathered the electric current that flows through on first switching tube that is connected with this current sampling unit or the second switch pipe accordingly, promptly sampling switch pipe S is consistent with the sequential of second switch pipe 20 closed and disconnecteds in second sampling unit 221, and the sampling switch pipe S in first sampling unit 210 is consistent with the sequential of first switching tube, 211 closed and disconnecteds.
Be appreciated that, in the present embodiment, at the closed of 30 pairs first switching tubes 211 of switch control unit or disconnect when controlling, when the electric current forward of first current sampling unit 210 reduces or negative sense reduces, then control first switching tube 211 and disconnect second switch pipe 220 closures; When the electric current forward of second current sampling unit 221 reduces or negative sense reduces, then control second switch pipe 220 and disconnect first switching tube, 211 closures.
Current sampling unit in the present embodiment is when work, shown in Fig. 3 a, when sampling switch pipe S closure, and when the former limit winding of current transformer T flows through as shown in the figure forward current, the secondary winding of current transformer T also flows through forward current, then secondary winding, diode d1, sampling switch pipe S, sampling resistor R and diode d4 form accumulator among the current transformer T, be side circuit among Fig. 3 a, and the forward current that flows through on first switching tube that is connected according to direction of arrow collection among the figure or the second switch pipe; Shown in Fig. 3 b, when sampling switch pipe S disconnects, at this moment secondary winding, voltage stabilizing didoe d5 and d6 form continuous current circuit among the current transformer T, it is side circuit among Fig. 3 b, and according to forward current oppositely, promptly the arrow direction discharges the energy of gathering among the figure, and at this moment voltage stabilizing didoe d5 is operated in breakdown state.
Shown in Fig. 3 c, when sampling switch pipe S closure, and when the former limit winding of current transformer T flows through as shown in the figure negative current, the secondary winding of current transformer T also flows through negative current, then secondary winding, diode d2, diode d3, sampling switch pipe S and sampling resistor R form accumulator among the current transformer T, be the side circuit among Fig. 3 c, and the negative current that flows through on first switching tube that is connected according to dotted arrow direction collection among the figure or the second switch pipe; Shown in Fig. 3 d, when sampling switch pipe S disconnects, at this moment secondary winding, voltage stabilizing didoe d5 and d6 form continuous current circuit among the current transformer T, it is the side circuit among Fig. 3 d, and according to negative current oppositely, promptly the arrow direction discharges the energy of gathering among the figure, and at this moment voltage stabilizing didoe d6 is operated in breakdown state.
Wherein the voltage stabilizing value of voltage stabilizing didoe d5 and d6 needs height, as scope 4 times of sampling resistor R operating voltages, make energy storage time at current transformer T greater than the time of releasing energy like this, the duty ratio (duty) that is current transformer was greater than 50% o'clock, when if the voltage stabilizing value of voltage stabilizing didoe is high, can make that the energy that is stored into current transformer T is at short notice discharged fully; In addition, gather electric current with instrument transformer in the present embodiment and can realize voltage isolation.
Switching tube is insulating gate type field effect tube (Mosfet) in the present embodiment, or insulating gate type bipolar transistor (IGBT), or bipolar junction transistor (BJT) etc.
To shown in Fig. 4 d, in another specific embodiment, first current sampling unit 210 and second current sampling unit 221 are realized in a like fashion, can comprise with reference to figure 4a:
Current transformer T1, voltage stabilizing didoe d9 that two homopolarities are interconnected and d10 (being that negative electrode is interconnected among the figure), two diode d7 and d8, sampling switch pipe S ' and sampling resistor R1; Described current transformer T1 comprises former limit winding and is connected in two secondary windings of winding end points s;
The two ends p of the former limit winding of described current transformer T1 be connected with q with described second bridge arm unit 20 in, be that the former limit winding and first switching tube 211 are series at first and are connected in parallel a little between 1 and second tie point 3, or and second switch pipe 220 be series at second and be connected in parallel a little between 2 and second tie point 3;
Between the winding end points s and another end points 7 of the first secondary winding in described two secondary windings, have to be described sampling switch pipe S ', sampling resistor R1 and diode d7 who is connected in series; Between two non-winding end points 7 and 8 of described two secondary windings, two the diode d7 and the d8 that are that homopolarity is connected in series are arranged, and be parallel with two voltage stabilizing didoe d9 and the d10 that is that homopolarity is connected in series, be to connect among the figure with anode.When sampling switch pipe S ' was closed, this current sampling unit can be gathered the electric current that flows through on the current transformer T1, the energy of release current instrument transformer T1 like this.
Sampling resistor R1 is connected with switch control unit 30, when described sampling switch pipe S ' and first switching tube or second switch pipe closure, described current sampling unit is gathered the electric current that flows through on first switching tube that is connected with this current sampling unit or the second switch pipe accordingly, promptly the sampling switch pipe S ' in second sampling unit 221 is identical or corresponding with the sequential of second switch pipe 220 closed and disconnecteds, promptly consistent, and the sampling switch pipe S ' in first sampling unit 210 is identical or corresponding with the sequential of first switching tube, 211 closed and disconnecteds, and is promptly consistent.
Be appreciated that, in the present embodiment, at the closed of 30 pairs first switching tubes 211 of switch control unit or disconnect when controlling, when the electric current forward of first current sampling unit 210 reduces or negative sense reduces, then control first switching tube 211 and disconnect second switch pipe 220 closures; When the electric current forward of second current sampling unit 221 reduces or negative sense reduces, then control second switch pipe 220 and disconnect first switching tube, 211 closures.
Sampling unit in the present embodiment is when work, shown in Fig. 4 a, when sampling switch pipe S ' closure, and when the former limit winding of current transformer T1 flows through as shown in the figure forward current, two secondary windings of current transformer T1 also flow through forward current, then the first secondary winding, diode d7, sampling switch pipe S ' and sampling resistor R1 promptly form accumulator among the current transformer T1, be the side circuit among Fig. 4 a, and the forward current that flows through on first switching tube that is connected according to the collection of solid arrow direction or the second switch pipe; Shown in Fig. 4 b, when sampling switch pipe S ' disconnects, at this moment two secondary windings, voltage stabilizing didoe d9 and d10 form continuous current circuit among the current transformer T1, it is the side circuit among Fig. 4 b, and according to forward current oppositely, promptly the direction of arrow discharges the energy of gathering among the figure, and at this moment voltage stabilizing didoe d9 is operated in breakdown state.
Shown in Fig. 4 c, when sampling switch pipe S ' closure, and when the former limit winding of current transformer T1 flows through as shown in the figure negative current, two secondary windings of current transformer T1 also flow through negative current, then the second secondary winding, diode d8, sampling switch pipe S ' and sampling resistor R1 promptly form accumulator among the current transformer T1, be the side circuit among Fig. 4 c, and the negative current that flows through on first switching tube that is connected according to the collection of dotted arrow direction or the second switch pipe; Shown in Fig. 4 d, when sampling switch pipe S ' disconnects, at this moment two secondary windings, voltage stabilizing didoe d9 and d10 form continuous current circuit among the current transformer T1, it is the side circuit among Fig. 4 d, and according to negative current oppositely, promptly the direction of arrow discharges the energy of gathering among the figure, and at this moment voltage stabilizing didoe d10 is operated in breakdown state.
Wherein the voltage stabilizing value of voltage stabilizing didoe d9 and d10 needs height, as scope 4 times of sampling resistor R1 operating voltages, make energy storage time at current transformer T1 greater than the time of releasing energy like this, the duty ratio (duty) that is current transformer was greater than 50% o'clock, when if the voltage stabilizing value of voltage stabilizing didoe is high, can make that the energy that is stored into current transformer T is at short notice discharged fully; Outside two, gather electric current with instrument transformer in the present embodiment and can realize voltage isolation.
And switching tube also is an insulating gate type field effect tube (Mosfet) in the present embodiment, or insulating gate type bipolar transistor (IGBT), or bipolar junction transistor (BJT) etc.
As seen, in the totem-pole bridgeless circuit system of the embodiment of the invention, comprise switch control unit 30, two current sampling units in second bridge arm unit 20, have been increased, the electric current that described switch control unit 30 is gathered by first current sampling unit 210 and second current sampling unit 221, control the closed of first switching tube 211 in second bridge arm unit 20 and second switch pipe 220 respectively or disconnect, compare with totem-pole bridgeless circuit system in the prior art, the system of the embodiment of the invention can come the disconnection or the closure of control switch pipe by the electric current of current sampling unit collection, reduced in the totem-pole bridgeless circuit system the difficulty of switch controlled, improved the utilance of totem-pole bridgeless circuit system.
Device embodiment two
A kind of current sampling device, the system of present embodiment can be used in the sampling of power electronics AC rectification electric current, also can be used in the sampling of polyphase ac rectified current, and structural representation, comprising to shown in the 3d as Fig. 3 a:
Current transformer T, the voltage stabilizing didoe d5 that two homopolarities are interconnected and d6 (being that negative electrode is interconnected among the figure), four diode d1 are to d4, sampling switch pipe S and sampling resistor R, and described current transformer T comprises former limit winding and secondary winding;
Two described diode d1 and d3 homopolarity are connected into the first sampling bridge; In addition two described diode d2 and d4 homopolarity are connected into the second sampling bridge, and in the described first sampling bridge and the second sampling bridge, the diode that one of them sampling bridge comprises is to link to each other with anode, and the diode that another sampling bridge comprises is continuous with negative electrode; Among the figure in the first sampling bridge d1 link to each other with negative electrode with d3, second samples, and d2 links to each other with anode with d4 in the bridge;
The described first sampling bridge and second bridge of sampling is connected in parallel with the two ends a and the b of described secondary winding respectively; Described two voltage stabilizing didoe d5 after the homopolarity series connection and d6 be two end points in addition, and promptly two anodes are connected with b with the two ends a of described secondary winding respectively;
The two ends c on described former limit and d be sampled circuit and be connected;
The homopolarity tie point 5 and described second of two diode d1 and d3 is sampled in the bridge to be connected with between the homopolarity tie point 6 of two diode d2 and d4 and is described sampling switch pipe S and the sampling resistor R that is connected in series in the described first sampling bridge;
Sampling apparatus in the present embodiment is when work, shown in Fig. 3 a, when sampling switch pipe S closure, and when the former limit winding of current transformer T flows through forward current, the secondary winding of current transformer T also flows through forward current, then secondary winding, diode d1, sampling switch pipe S, sampling resistor R and diode d4 promptly form accumulator among the current transformer T, and promptly the side circuit among Fig. 3 a is gathered forward current according to the direction of arrow; Shown in Fig. 3 b, when sampling switch pipe S disconnects, at this moment secondary winding, voltage stabilizing didoe d5 and d6 form continuous current circuit among the current transformer T, it is the side circuit among Fig. 3 b, and press forward current oppositely, be that the direction of arrow discharges the energy of gathering, at this moment voltage stabilizing didoe d5 is operated in breakdown state.
Shown in Fig. 3 c, when sampling switch pipe S closure, and when the former limit winding of current transformer T flows through negative current, the secondary winding of current transformer T also flows through negative current, then secondary winding, diode d2, diode d3, sampling switch pipe S and sampling resistor R promptly form accumulator among the current transformer T, be the side circuit among Fig. 3 c, gather negative current according to the dotted arrow direction; Shown in Fig. 3 d, when sampling switch pipe S disconnects, at this moment secondary winding, voltage stabilizing didoe d5 and d6 form continuous current circuit among the current transformer T, it is side circuit among Fig. 3 d, and according to negative current oppositely, be that the direction of arrow discharges the energy of gathering, at this moment voltage stabilizing didoe d6 is operated in breakdown state.
Wherein the voltage stabilizing value of voltage stabilizing didoe d5 and d6 needs height, as scope 4 times of sampling resistor R operating voltages, make energy storage time at current transformer T greater than the time of releasing energy like this, the duty ratio (duty) that is current transformer was greater than 50% o'clock, when if the voltage stabilizing value of voltage stabilizing didoe is high, can make that the energy that is stored into current transformer T is at short notice discharged fully; Outside two, gather electric current with instrument transformer in the present embodiment and can realize voltage isolation.
Above-mentioned sampling switch pipe is insulating gate type field effect tube (Mosfet), or insulating gate type bipolar transistor (IGBT), or bipolar junction transistor (BJT) etc.
As seen, the electric current that current sampling device in the present embodiment can be gathered alternating current is promptly gathered the bidirectional current of power supply, promptly by secondary winding among the current transformer T, diode d1, sampling switch pipe S, the accumulator that sampling resistor R and diode d4 form, gather forward current, by secondary winding among the current transformer T, diode d2, diode d3, the accumulator that sampling switch pipe S and sampling resistor R form, gather negative current, compare with the current sampling device that can only gather unidirectional current in the prior art, the current sampling device of present embodiment is used more extensive.
Device embodiment three
A kind of current sampling device, the system of present embodiment can be used in the sampling of power electronics AC rectification electric current, also can be used in the sampling of polyphase ac rectified current, and structural representation, comprising to shown in the 4d as Fig. 4 a:
Current transformer T1, voltage stabilizing didoe d9 that two homopolarities are interconnected and d10 (being that negative electrode is interconnected among the figure), two diode d7 and d8, sampling switch pipe S ' and sampling resistor R1; Described current transformer T1 comprises former limit winding and is connected in two secondary windings of winding end points s;
The two ends p of the former limit winding of described current transformer T1 and q be sampled circuit and be connected;
Between the winding end points s and another end points 7 of the first secondary winding in described two secondary windings, have to be described sampling switch pipe S ', sampling resistor R1 and diode d7 who is connected in series; Between two non-winding end points 7 of described two secondary windings and 8, two the diode d7 and the d8 that are that homopolarity is connected in series being arranged, and be parallel with and be described two voltage stabilizing didoe d9 and the d10 that homopolarity is connected in series, is to connect with anode among the figure.
Sampling apparatus in the present embodiment is when work, shown in Fig. 4 a, when sampling switch pipe S ' closure, and when the former limit winding of current transformer T1 flows through forward current, two secondary windings of current transformer T1 also flow through forward current, then the first secondary winding, diode d7, sampling switch pipe S ' and sampling resistor R1 promptly form accumulator among the current transformer T1, and promptly the side circuit among Fig. 4 a is gathered forward current according to the solid arrow direction; Shown in Fig. 4 b, when sampling switch pipe S ' disconnects, at this moment two secondary windings, voltage stabilizing didoe d9 and d10 form continuous current circuit among the current transformer T1, it is the side circuit among Fig. 4 b, and according to forward current oppositely, be that the direction of arrow discharges the energy of gathering, at this moment voltage stabilizing didoe d9 is operated in breakdown state.
Shown in Fig. 4 c, when sampling switch pipe S ' closure, and when negative current is flow through on the former limit of current transformer T1, two secondary windings of current transformer T1 also flow through negative current, then the second secondary winding, diode d8, sampling switch pipe S ' and sampling resistor R promptly form accumulator among the current transformer T1, be the side circuit among Fig. 4 c, gather negative current according to the dotted arrow direction; Shown in Fig. 4 d, when sampling switch pipe S ' disconnects, at this moment two secondary windings, voltage stabilizing didoe d9 and d10 form continuous current circuit among the current transformer T1, it is the side circuit among Fig. 4 d, press the reverse of negative current, be that the direction of arrow discharges the energy of gathering, at this moment voltage stabilizing didoe d10 is operated in breakdown state.
Wherein the voltage stabilizing value of voltage stabilizing didoe d9 and d10 needs height, as scope 4 times of sampling resistor R1 operating voltages, make energy storage time at current transformer T1 greater than the time of releasing energy like this, the duty ratio (duty) that is current transformer was greater than 50% o'clock, when if the voltage stabilizing value of voltage stabilizing didoe is high, can make that the energy that is stored into current transformer T is at short notice discharged fully; Outside two, gather electric current with instrument transformer in the present embodiment and can realize voltage isolation.
And switching tube also is an insulating gate type field effect tube (Mosfet) in the present embodiment, or insulating gate type bipolar transistor (IGBT), or bipolar junction transistor (BJT) etc.
The electric current that current sampling device in the present embodiment can be gathered alternating current is promptly gathered the bidirectional current of power supply, promptly two secondary windings by current transformer T1 also flow through forward current, the first secondary winding among the current transformer T1 then, diode d7, the accumulator that sampling switch pipe S ' and sampling resistor R1 form, gather forward current, by the second secondary winding among the current transformer T1, diode d8, the accumulator that sampling switch pipe S ' and sampling resistor R form, gather negative current. compare with the current sampling device that can only gather unidirectional current in the prior art, the current sampling device of present embodiment is used more extensive; And compare with the current sampling device among the embodiment two, simple in structure, used electronic device is few, can save resource, thereby makes that the consumption of circuit is less.
In sum, in the totem-pole bridgeless circuit system of the embodiment of the invention, comprise switch control unit, two current sampling units in second bridge arm unit, have been increased, the electric current that described switch control unit is gathered by first current sampling unit and second current sampling unit, control the closed of first switching tube in second bridge arm unit and second switch pipe respectively or disconnect, compare with totem-pole bridgeless circuit system in the prior art, the system of the embodiment of the invention can come the disconnection or the closure of control switch pipe by the electric current of current sampling unit collection, reduced in the totem-pole bridgeless circuit system the difficulty of switch controlled, improved the utilance of totem-pole bridgeless circuit system.
Should be understood that embodiment of the invention scheme can also be applied to power electronics AC rectification current sample, equally also can be applied to the current sample of polyphase ac rectification.More than to totem-pole bridgeless circuit system and current sampling device that the embodiment of the invention provided, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. totem-pole bridgeless circuit system, comprise: be connected in parallel in first and be connected in parallel a little and second first bridge arm unit and second bridge arm unit between being connected in parallel a little, comprise first diode and second diode of series aiding connection in described first bridge arm unit; First switching tube and the second switch pipe that comprise series aiding connection in described second bridge arm unit; Between second tie point between first tie point between described two diodes and described two switching tubes, be connected with power supply and inductance, it is characterized in that described system also comprises switch control unit, and described second bridge arm unit comprise also:
Two current sampling units, wherein first switching tube in first current sampling unit and described two switching tubes be series at described first be connected in parallel a little and second tie point between; Second switch pipe in second current sampling unit and described two switching tubes be series at described second be connected in parallel a little and second tie point between;
Described first current sampling unit is used for when described first switching tube is closed, and acquisition stream is crossed the electric current of described first switching tube; When described first switching tube disconnects, discharge the energy that described first current sampling unit is gathered;
So second current sampling unit is used for when described second switch pipe is closed, acquisition stream is crossed the electric current of described second switch pipe; When described second switch pipe disconnects, discharge the energy that described second current sampling unit is gathered;
Described switch control unit, be connected with the second switch pipe with described two current sampling units and first switching tube, be used for electric current, control the closed or disconnection of described first switching tube and described second switch pipe according to described first current sampling unit and the collection of described second current sampling unit.
2. the system as claimed in claim 1 is characterized in that, described current sampling unit comprises: current transformer, and two voltage stabilizing didoes, four diodes, sampling switch pipe and sampling resistors, described current transformer comprises former limit winding and secondary winding;
Two described diode homopolarities are connected into the first sampling bridge; Two described diodes are connected into the second sampling bridge with homopolarity in addition, and in the described first sampling bridge and the second sampling bridge, the diode that one of them sampling bridge comprises is to link to each other with anode, and the diode that another sampling bridge comprises is to link to each other with negative electrode; And the described first sampling bridge and second bridge of sampling is connected in parallel with the two ends of described secondary winding respectively;
After described two voltage stabilizing didoe homopolarities connected, two ends were connected in parallel with the two ends of described secondary winding respectively in addition;
Described former limit winding and described first switching tube be series at described first be connected in parallel a little and second tie point between, or and described second switch pipe be series at described second be connected in parallel a little and second tie point between;
Be connected with between the homopolarity tie point of two diodes in the homopolarity tie point of two diodes and the described second sampling bridge in the described first sampling bridge and be described sampling switch pipe and the sampling resistor that is connected in series;
Described sampling resistor is connected with described switch control unit, when described sampling switch pipe and first switching tube or second switch pipe closure, the electric current that flows through on first switching tube that the collection of described current sampling unit correspondence is connected with this current sampling unit or the second switch pipe.
3. the system as claimed in claim 1 is characterized in that, described current sampling unit comprises: current transformer, two voltage stabilizing didoes, two diodes, sampling switch pipe and sampling resistors; Described current transformer comprises former limit winding and is connected in two secondary windings of winding end points;
The former limit winding of described current transformer and described first switching tube be series at described first be connected in parallel a little and second tie point between, or and described second switch pipe be series at described second be connected in parallel a little and second tie point between;
Between the winding end points and another end points of the first secondary winding in described two secondary windings, have to be the described sampling switch pipe that is connected in series, described sampling resistor and a diode; Between two non-winding end points of described two secondary windings, have to be two described diodes that homopolarity is connected in series, and be parallel with and be two described voltage stabilizing didoes that homopolarity is connected in series;
Described sampling resistor is connected with described switch control unit, when described sampling switch pipe and first switching tube or second switch pipe closure, the electric current that flows through on first switching tube that the collection of described current sampling unit correspondence is connected with this current sampling unit or the second switch pipe.
4. as each described system of claim 1 to 3, it is characterized in that described switching tube is insulating gate type field effect tube Mosfet, or the insulating gate type bipolar transistor IGBT, or bipolar junction transistor BJT.
5. as claim 2 or 3 described methods, it is characterized in that the sampling switch pipe in described first current sampling unit is identical or corresponding with the switching sequence of described first switching tube;
Sampling switch pipe in described second current sampling unit is identical or corresponding with the switching sequence of described second switch pipe.
6. a current sampling device is characterized in that, comprising:
Current transformer, two voltage stabilizing didoes, four diodes, sampling switch pipe and sampling resistors, described current transformer comprises former limit winding and secondary winding; Wherein:
Two described diode homopolarities are connected into the first sampling bridge; Two described diode homopolarities are connected into the second sampling bridge in addition, and in the described first sampling bridge and the second sampling bridge, the diode that one of them sampling bridge comprises is to link to each other with anode, and the diode that another sampling bridge comprises is to link to each other with negative electrode; And the described first sampling bridge and second bridge of sampling is connected in parallel with the two ends of described secondary winding respectively;
Two end points in addition of described two voltage stabilizing didoes of homopolarity series connection are connected with the two ends of described secondary winding respectively;
The two ends of described former limit winding be sampled circuit and be connected;
Be connected with between the homopolarity tie point of two diodes in the homopolarity tie point of two diodes and the described second sampling bridge in the described first sampling bridge and be described sampling switch pipe and the sampling resistor that is connected in series.
7. as the described device of claim 6 claim, it is characterized in that described sampling switch pipe is insulating gate type field effect tube Mosfet, or the insulating gate type bipolar transistor IGBT, or bipolar junction transistor BJT.
8. a current sampling device is characterized in that, comprising:
Current transformer, two voltage stabilizing didoes, two diodes, sampling switch pipe and sampling resistors; Described current transformer comprises former limit winding and is connected in two secondary windings of winding end points;
The former limit winding of described current transformer be sampled circuit and be connected;
Between the winding end points and another end points of the first secondary winding in described two secondary windings, have to be the described sampling resistor that is connected in series, described sampling switch pipe and a diode; Between two non-winding end points of described two secondary windings, have to be two described diodes that homopolarity is connected in series, and be parallel with and be described two voltage stabilizing didoes that homopolarity is connected in series.
9. as the described device of claim 8 claim, it is characterized in that described sampling switch pipe is insulating gate type field effect tube Mosfet, or the insulating gate type bipolar transistor IGBT, or bipolar junction transistor BJT.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102467135A CN101707441B (en) | 2009-11-26 | 2009-11-26 | Totem-pole bridgeless circuit system and current sampling device |
| PCT/CN2010/077646 WO2011063685A1 (en) | 2009-11-26 | 2010-10-11 | Totem-pole bridgeless circuit system and current sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009102467135A CN101707441B (en) | 2009-11-26 | 2009-11-26 | Totem-pole bridgeless circuit system and current sampling device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100046824A Division CN102520232A (en) | 2009-11-26 | 2009-11-26 | Current sampling device |
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| CN101707441A true CN101707441A (en) | 2010-05-12 |
| CN101707441B CN101707441B (en) | 2012-06-06 |
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| WO (1) | WO2011063685A1 (en) |
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Also Published As
| Publication number | Publication date |
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| WO2011063685A1 (en) | 2011-06-03 |
| CN101707441B (en) | 2012-06-06 |
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