CN102721848A - Method and apparatus for detecting input current of bridgeless PFC circuit - Google Patents
Method and apparatus for detecting input current of bridgeless PFC circuit Download PDFInfo
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- CN102721848A CN102721848A CN2011100772982A CN201110077298A CN102721848A CN 102721848 A CN102721848 A CN 102721848A CN 2011100772982 A CN2011100772982 A CN 2011100772982A CN 201110077298 A CN201110077298 A CN 201110077298A CN 102721848 A CN102721848 A CN 102721848A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method and an apparatus for detecting an input current of a bridgeless PFC circuit. The method comprises the following steps of connecting a positive-half-cycle diverter unit in series in a positive-half-cycle loop of a bridgeless PFC branch and connecting a negative-half-cycle diverter unit in series in a negative-half-cycle loop of the bridgeless PFC branch, detecting voltages cross the two sides of the positive-half-cycle diverter unit and the negative-half-cycle diverter unit respectively, and thus calculating the input current through the bridgeless PFC circuit. Through connecting the positive-half-cycle diverter unit and the negative-half-cycle diverter unit in series in the positive-half-cycle loop and the negative-half-cycle loop of the PFC circuit respectively and by detecting the voltages of the two sides of the positive-half-cycle diverter unit and the negative-half-cycle diverter unit, an inductor current through the PFC circuit can be calculated simply, conveniently and effectively, timely sampling of the input current can be realized and a sampling difficulty of the input current through the bridgeless PFC circuit can be reduced.
Description
Technical field
The present invention relates to input current detection method and device, more particularly, relate to a kind of input current detection method and device of non-bridge PFC circuits.
Background technology
Passive power factor corrective (APFC; Active Power Factor Correction) in communication power supply, is widely used; Need sample to exchanging input current in the control of APFC; Directly relatively difficult in non-bridge PFC circuits (particularly, totem non-bridge PFC circuits) to exchanging the input current sampling.Still incomparably simple, convenient and effective at present to the current sample scheme that is operated in the non-bridge PFC circuits under the continuous current mode (CCM, CurrentContinuous Mode).
Summary of the invention
The object of the present invention is to provide a kind of input current detecting device of non-bridge PFC circuits, be intended to solve in the prior art directly relatively difficult in non-bridge PFC circuits exchanging the input current sampling; Still incomparable at present simple, convenient and effective problem to the aspects such as current sample scheme that are operated in the non-bridge PFC circuits under the continuous current mode.
The present invention also aims to provide a kind of input current detection method of non-bridge PFC circuits, to solve the problems referred to above that exist in the prior art better.
In order to realize goal of the invention; A kind of input current detecting device of non-bridge PFC circuits is provided; Said non-bridge PFC circuits comprises at least one non-bridge PFC branch road; Said input current detecting device comprises the Average Current Control loop that is used for controlling said each switching tube dutycycle of non-bridge PFC branch road, and said input current detecting device also comprises: be connected on the negative half period shunt unit in positive half cycle shunt unit and the negative half period loop that is connected on said non-bridge PFC branch road in the positive half cycle loop of said non-bridge PFC branch road; Said Average Current Control loop also is used for detecting respectively the voltage at said positive half cycle shunt unit and two ends, negative half period shunt unit, thereby calculates the input current of said non-bridge PFC circuits.
Preferably, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads that are connected in parallel; The positive half cycle shunt of series connection unit in the positive half cycle loop of each non-bridge PFC branch road, and in the negative half period loop of each non-bridge PFC branch road series connection negative half period shunt unit.
Preferably, in the positive half cycle loop of each non-bridge PFC branch road, positive half cycle shunt units in series is between the positive half cycle rectification unit and the positive unidirectional conduction device of half cycle of non-bridge PFC branch road; In the negative half period loop of each non-bridge PFC branch road, negative half period shunt units in series is between the negative half period rectification unit and the unidirectional conduction device of negative half period of non-bridge PFC branch road;
Preferably, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads of crisscross parallel; In positive half cycle loop, the positive half cycle rectification unit of each PFC branch road is connected in parallel to form positive half cycle rectification module, and said positive half cycle shunt unit and said positive half cycle rectification module are in series; In the negative half period loop, the negative half period rectification unit of each PFC branch road is connected in parallel to form the negative half period rectification module, and said negative half period shunt unit and said negative half period rectification module are in series.
Preferably, said positive half cycle shunt unit is connected between said positive half cycle rectification module and the positive unidirectional conduction device of half cycle; Said negative half period shunt unit is connected between said negative half period rectification module and the unidirectional conduction device of negative half period.
Preferably, said positive half cycle shunt unit and negative half period shunt unit are constituted, are constituted, perhaps are made up of a plurality of shunt parallel connections by a plurality of shunt series connection by a shunt respectively.
Preferably, said shunt is shunt resistance, current transformer or hall device.
Preferably, said non-bridge PFC branch road is the totem-pote circuit structure.
In order to realize goal of the invention better, a kind of input current detection method of non-bridge PFC circuits also is provided, said non-bridge PFC circuits comprises at least one non-bridge PFC branch road, this method may further comprise the steps:
The positive half cycle shunt of series connection unit in the positive half cycle loop of said non-bridge PFC branch road, and the negative half period shunt unit of in the negative half period loop of said non-bridge PFC branch road, connecting;
Detect the voltage at said positive half cycle shunt unit and two ends, negative half period shunt unit respectively, thereby calculate the input current of said non-bridge PFC circuits.
Preferably, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads that are connected in parallel; The positive half cycle shunt of series connection unit in the positive half cycle loop of each non-bridge PFC branch road, and in the negative half period loop of each non-bridge PFC branch road series connection negative half period shunt unit.
Preferably, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads of crisscross parallel; In positive half cycle loop, the positive half cycle rectification unit of each PFC branch road is connected in parallel to form positive half cycle rectification module, and said positive half cycle shunt unit and said positive half cycle rectification module are in series; In the negative half period loop, the negative half period rectification unit of each PFC branch road is connected in parallel to form the negative half period rectification module, and said negative half period shunt unit and said negative half period rectification module are in series.
The input current detection method and the device of the non-bridge PFC circuits of embodiment of the present invention; Has following beneficial effect: through in the positive half cycle loop of pfc circuit and negative half period loop, connect respectively positive half cycle shunt unit and negative half period shunt unit; Thereby can be through detecting the voltage at positive half cycle shunt unit and two ends, negative half period shunt unit; With simple, convenient and calculate the inductive current in the pfc circuit effectively; Realization has reduced the sampling difficulty of the input current of non-bridge PFC circuits to the input current real-time sampling.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Figure 1A is the electrical block diagram of input current detecting device first embodiment of non-bridge PFC circuits of the present invention;
Figure 1B is the electrical block diagram of input current detecting device second embodiment of non-bridge PFC circuits of the present invention;
Fig. 2 A is the electrical block diagram of input current detecting device the 3rd embodiment of non-bridge PFC circuits of the present invention;
Fig. 2 B is the electrical block diagram of input current detecting device the 4th embodiment of non-bridge PFC circuits of the present invention;
Fig. 3 A is the electrical block diagram of input current detecting device the 5th embodiment of non-bridge PFC circuits of the present invention;
Fig. 3 B is the electrical block diagram of input current detecting device the 6th embodiment of non-bridge PFC circuits of the present invention;
Fig. 4 is the process flow diagram of first embodiment of the input current detection method of non-bridge PFC circuits of the present invention;
Fig. 5 is the process flow diagram of second embodiment of the input current detection method of non-bridge PFC circuits of the present invention;
Fig. 6 is the oscillogram of the alternating voltage of inductive current and input in the non-bridge PFC circuits of the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The input current detecting device of non-bridge PFC circuits of the present invention mainly comprises two parts, is respectively: current detecting part and calculation control part.
This non-bridge PFC circuits is connected between AC power and the load.In order to detect the input current in this non-bridge PFC circuits; Promptly detect the inductive current in the non-bridge PFC circuits; The present invention through in the positive half cycle loop of this non-bridge PFC circuits and negative half period loop, connect respectively respectively positive half cycle shunt unit and negative half period shunt unit with as the current detecting part, thereby make in positive half cycle loop positive half cycle shunt unit and inductance formation series relationship; In the negative half period loop, negative half period shunt unit and inductance also form series relationship simultaneously.Thus can be through detecting the magnitude of voltage at positive half cycle shunt unit and two ends, negative half period shunt unit; Again respectively divided by the resistance value of positive half cycle shunt unit and negative half period shunt unit; Thereby obtain current value respectively through positive half cycle shunt unit and negative half period shunt unit; The current value that last current value by negative half period shunt unit alleviates positive half cycle shunt unit obtains the inductive current value, i.e. the input current value of AC power.
Wherein, the calculating for this current value is by carrying out as the Average Current Control loop of calculation control part.This Average Current Control loop passes through Average Current Control Method at last; And according to the inductive current value that calculates; Each control end of switching tube in the non-bridge PFC circuits is carried out signal output; Regulate the dutycycle of each switching tube thus, finally make the waveform of inductive current and AC-input voltage be consistent, realize input current tracking AC-input voltage.
Figure 1A illustrates first embodiment of the input current detecting device of non-bridge PFC circuits of the present invention, and wherein, this non-bridge PFC circuits only comprises a non-bridge PFC branch road, and this non-bridge PFC branch road is connected between AC power Vac and the load RL.
Between non-bridge PFC branch road and load RL, also be connected with level reed position capacitor C b.
This non-bridge PFC branch road comprises that inductance L s, MOSFET pipe S1, MOSFET manage S2, diode D1 and diode D2.
Inductance L s, MOSFET pipe S1 and diode D1 are connected in order between positive bus-bar and the negative busbar of AC power Vac and constitute positive half cycle loop, and wherein, MOSFET pipe S1 provides rectification function as positive half cycle rectification unit.Diode D1 is as unidirectional conduction device, with the circulation path of guide current.
Diode D2, MOSFET pipe S2 and inductance L s are connected in order between negative busbar and the positive bus-bar of AC power Vac and constitute the negative half period loop, and wherein, diode D2 is as unidirectional conduction device, with the circulation path of guide current.MOSFET pipe S2 provides rectification function as the negative half period rectification unit.
In positive half cycle loop, series connection one positive half cycle shunt unit 11 makes this positive half cycle shunt unit 11 and inductance L s form series relationship; Preferably, positive half cycle shunt unit 11 is connected between MOSFET pipe S1 and the diode D1, is connected specifically between negative busbar and the diode D1.
In the negative half period loop, the negative half period shunt unit 12 of connecting makes this negative half period shunt unit 12 and inductance L s form series relationship; Preferably, negative half period shunt unit 12 is connected between diode D2 and the MOSFET pipe S2, is connected specifically between positive bus-bar and the diode D2.
Average Current Control loop 2 detects the voltage at positive half cycle shunt unit 11 and 12 two ends, negative half period shunt unit respectively; Again according to the relation of voltage, electric current and resistance; Obtain size of current, promptly obtain electric current through inductance L s through positive half cycle shunt unit 11 and negative half period shunt unit 12.
Average Current Control loop 2 transmits control signal through the grid to MOSFET pipe S1 and MOSFET pipe S2 according to the electric current on the Ls; To regulate the dutycycle of MOSFET pipe S1 and MOSFET pipe S2; The final waveform of input current and AC-input voltage of realizing is consistent, and promptly realizes input current tracking AC-input voltage.
Understandable, this positive half cycle shunt unit 11 all can be made up of a shunt respectively with negative half period shunt unit 12 or a plurality of shunt is in series, again or be formed in parallel by a plurality of shunts.This shunt can be selected shunt resistance, current transformer or hall device for use.
For Average Current Control loop 2, it can use the existing circuit structure of carrying out the Average Current Control Method loop.Because the present invention do not improve this Average Current Control loop 2, therefore the details of its hardware configuration and relevant principle of work is not done further expansion.In addition, can be designed to the circuit structure form of totem for each non-bridge PFC branch road.
Fig. 2 A illustrates second embodiment of the input current detecting device of non-bridge PFC circuits of the present invention, and wherein, this non-bridge PFC circuits also only comprises a non-bridge PFC branch road.The difference of this second embodiment and first embodiment is that in a second embodiment, positive half cycle shunt unit 11 only is embodied as and is made up of a shunt resistance R2, and negative half period shunt unit 12 only also is embodied as and is made up of a shunt resistance R1.
In addition, non-bridge PFC circuits of the present invention can be made up of a plurality of non-bridge PFC branch roads.When using a plurality of non-bridge PFC branch road, a plurality of non-bridge PFC branch roads can be parallel with one another, forms this non-bridge PFC circuits.Also can be a plurality of non-bridge PFC branch road crisscross parallels, form this non-bridge PFC circuits.
In the non-bridge PFC branch road of crisscross parallel, a shared unidirectional conduction device in the positive half cycle loop of all non-bridge PFC branch roads, an also shared unidirectional conduction device in the negative half period loop of all non-bridge PFC branch roads.That is to say that in the non-bridge PFC circuits of crisscross parallel, when increasing the non-bridge PFC branch road, only needing increases the quantity as the MOSFET pipe of rectification unit, and need not increase the quantity of diode.Promptly, wherein, in positive half cycle loop and negative half period loop, has only a diode respectively as unidirectional conduction device no matter what non-bridge PFC branch road crisscross parallels to constitute this non-bridge PFC circuits by.
Fig. 2 A illustrates the 3rd embodiment of the input current detecting device of non-bridge PFC circuits of the present invention; Wherein, This non-bridge PFC circuits is formed in parallel by two non-bridge PFC branch roads; This non-bridge PFC circuits is connected between AC power Vac and the load RL, between non-bridge PFC circuits and load RL, also is connected with level reed position capacitor C b.
Wherein, inductance L s1, MOSFET pipe S1, MOSFET pipe S2, diode D1 and diode D2 constitute the first non-bridge PFC branch road.Inductance L s2, MOSFET pipe S3, MOSFET pipe S4, diode D3 and diode D4 constitute the second non-bridge PFC branch road.
Inductance L s1, MOSFET pipe S1 and diode D1 constitute the positive half cycle loop of the first non-bridge PFC branch road; Positive half cycle shunt unit 11 of series connection in the positive half cycle loop of this first non-bridge PFC branch road; Preferably, this positive half cycle shunt unit 11 is connected between MOSFET pipe S1 and the diode D1.
Diode D2, MOSFET pipe S2 and inductance L s1 constitute the negative half period loop of the first non-bridge PFC branch road; Negative half period shunt unit 12 of series connection in the negative half period loop of this first non-bridge PFC branch road; Preferably, this negative half period shunt unit 12 is connected between diode D2 and the MOSFET pipe S2.
Average Current Control loop 2 detects the voltage at positive half cycle shunt unit 11 and 12 two ends, negative half period shunt unit respectively; Again according to the relation of voltage, electric current and resistance; Obtain size of current, promptly obtain electric current through inductance L s1 through positive half cycle shunt unit 11 and negative half period shunt unit 12.
Then; Average Current Control loop 2 transmits control signal through the grid to MOSFET pipe S1 and MOSFET pipe S2; To regulate the dutycycle of MOSFET pipe S1 and MOSFET pipe S2; The final waveform of input current and AC-input voltage of realizing is consistent, and promptly realizes input current tracking AC-input voltage.
Inductance L s2, MOSFET pipe S3 and diode D3 constitute the positive half cycle loop of the second non-bridge PFC branch road; Positive half cycle shunt 11 of series connection in the positive half cycle loop of this second non-bridge PFC branch road; Preferably, this positive half cycle shunt 11 is connected between MOSFET pipe S3 and the diode D3.Diode D4, MOSFET pipe S4 and inductance L s2 constitute the negative half period loop of the second non-bridge PFC branch road; Negative half period shunt unit 12 of series connection in the negative half period loop of this second non-bridge PFC branch road; Preferably, this negative half period shunt unit 12 is connected on diode D4 and MOSFET pipe S4.
Equally; Average Current Control loop 2 detects the voltage at positive half cycle shunt unit 11 and 12 two ends, negative half period shunt unit respectively; Again according to the relation of voltage, electric current and resistance; Obtain size of current, promptly obtain electric current through inductance L s2 through positive half cycle shunt unit 11 and negative half period shunt unit 12.
Then; Average Current Control loop 2 transmits control signal through the grid to MOSFET pipe S3 and MOSFET pipe S4; To regulate the dutycycle of MOSFET pipe S3 and MOSFET pipe S4; The final waveform of input current and AC-input voltage of realizing is consistent, and promptly realizes input current tracking AC-input voltage.
This shows that when non-bridge PFC circuits is when being formed in parallel by two non-bridge PFC branch roads, it has two positive half cycle loops and two negative half period loops altogether, and needs four shunt unit of series connection.By that analogy, when non-bridge PFC circuits, be formed in parallel by N non-bridge PFC branch road, it has N positive half cycle loop and N negative half period loop altogether, and needs 2N shunt unit of series connection.
Fig. 2 B illustrates the 4th embodiment of the input current detecting device of non-bridge PFC circuits of the present invention, and wherein, this non-bridge PFC circuits also is to be formed in parallel by two non-bridge PFC branch roads.The difference of the 4th embodiment and Fig. 2 A is that in the 4th embodiment, the positive half cycle shunt unit 11 in the positive half cycle loop of the first non-bridge PFC branch road only is embodied as and is made up of a shunt resistance R2.Negative half period shunt unit 12 in the negative half period loop of the first non-bridge PFC branch road only is embodied as and is made up of a shunt resistance R1.Positive half cycle shunt unit 11 in the positive half cycle loop of the second non-bridge PFC branch road only is embodied as and is made up of a shunt resistance R3.Negative half period shunt unit 12 in the negative half period loop of the second non-bridge PFC branch road is embodied as only has a shunt resistance R4 to constitute.
Fig. 3 A illustrates the 5th embodiment of the input current detecting device of non-bridge PFC circuits of the present invention, and wherein, this non-bridge PFC circuits is formed by two non-bridge PFC branch road crisscross parallels.
Shared diode D1 and inductance L s2 in the positive half cycle loop of these two non-bridge PFC branch roads.
Shared diode D2 and inductance L s1 in the positive half cycle loop of these two non-bridge PFC branch roads.
MOSFET pipe S1 is as the positive half cycle rectification unit in the positive half cycle loop of the first non-bridge PFC branch road; MOSFET pipe S3 is as the positive half cycle rectification unit in the positive half cycle loop of the second non-bridge PFC branch road; The positive half cycle rectification unit parallel connection of the positive half cycle rectification unit of the first non-bridge PFC branch road and the second non-bridge PFC branch road constitutes positive half cycle rectification module thus; Thereby in positive half cycle loop; Connect with positive half cycle rectification module in the positive half cycle shunt unit 11 of only need connecting, can make shared this positive half cycle shunt unit 11, positive half cycle loop of two non-bridge PFC branch roads, thereby connects with inductance L s2 in feasible this positive half cycle shunt unit 11.
In like manner; MOSFET pipe S2 is as the negative half period rectification unit in the negative half period loop of the first non-bridge PFC branch road; MOSFET pipe S4 is as the negative half period rectification unit in the negative half period loop of the second non-bridge PFC branch road, and thus, the parallel connection of the negative half period rectification unit of the negative half period rectification unit of the first non-bridge PFC branch road and the second non-bridge PFC branch road constitutes the negative half period rectification module; Thereby in the negative half period loop; Connecting with the negative half period rectification module in the negative half period shunt unit 12 of only need connecting, can make shared this negative half period shunt unit 12, negative half period loop of these two non-bridge PFC branch roads, thereby make this negative half period shunt unit 12 connect with inductance L s1.
Average Current Control loop 2 detects the voltage at positive half cycle shunt unit 11 and 12 two ends, negative half period shunt unit respectively; Again according to the relation of voltage, electric current and resistance; Obtain size of current, promptly obtain electric current through inductance L s2 and inductance L s1 through positive half cycle shunt unit 11 and negative half period shunt unit 12.Then; Average Current Control loop 2 transmits control signal through the grid to MOSFET pipe S1, MOSFET pipe S2, MOSFET pipe S3 and MOSFET pipe S4; To regulate the dutycycle of MOSFET pipe S1, MOSFET pipe S2, MOSFET pipe S3 and MOSFET pipe S4; The final waveform of input current and AC-input voltage of realizing is consistent, and promptly realizes input current tracking AC-input voltage.
Fig. 3 B illustrates the 6th embodiment of the input current detecting device of non-bridge PFC circuits of the present invention, and wherein, this non-bridge PFC circuits is formed by two non-bridge PFC branch road crisscross parallels.The distinctive points of the 6th embodiment and Fig. 3 A is that in the 6th embodiment, positive half cycle shunt unit 11 only is embodied as and is made up of a shunt resistance R2.Negative half period shunt unit 12 only is embodied as and is made up of a shunt resistance R1.
Fig. 4 shows the flow process of input current detection method of the non-bridge PFC circuits of first embodiment of the invention, and this method flow is based on Figure 1A～3B system architecture shown in one of them arbitrarily, and detailed process is following:
S41: the positive half cycle shunt of series connection unit in the positive half cycle loop of non-bridge PFC branch road, and the negative half period shunt unit of in the negative half period loop of non-bridge PFC branch road, connecting;
S42: the Average Current Control loop detects the voltage at positive half cycle shunt unit and two ends, negative half period shunt unit respectively, thereby according to the relation between voltage, electric current and the resistance, calculates the inductive current of non-bridge PFC circuits, i.e. input current.
Fig. 5 shows the flow process of input current detection method of the non-bridge PFC circuits of second embodiment of the invention, and this method flow is based on Figure 1A～3B system architecture shown in one of them arbitrarily, and detailed process is following:
S51: the positive half cycle shunt of series connection unit in the positive half cycle loop of non-bridge PFC branch road, and the negative half period shunt unit of in the negative half period loop of non-bridge PFC branch road, connecting;
S52: the Average Current Control loop detects the voltage at positive half cycle shunt unit and two ends, negative half period shunt unit respectively, thereby according to the relation between voltage, electric current and the resistance, calculates the inductive current of non-bridge PFC circuits, i.e. input current.
S53: the Average Current Control loop is according to the inductive current that calculates; All control end of switching tube in non-bridge PFC circuits transmit control signal; To regulate the dutycycle of all switching tubes; Thereby make the waveform of input current and the waveform of AC-input voltage be consistent, realized input current tracking AC-input voltage.The oscillogram of the alternating voltage of inductive current and input in the non-bridge PFC circuits as shown in Figure 6; Wherein, Heavy black line is represented the oscillogram of AC-input voltage, and the black fine rule representes that inductive current is the oscillogram of input current, can find out that therefrom both waveforms move towards to keep consistance highly.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the input current detecting device of a non-bridge PFC circuits; Said non-bridge PFC circuits comprises at least one non-bridge PFC branch road; Said input current detecting device comprises the Average Current Control loop that is used for controlling said each switching tube dutycycle of non-bridge PFC branch road; It is characterized in that said input current detecting device also comprises: be connected on the negative half period shunt unit in positive half cycle shunt unit and the negative half period loop that is connected on said non-bridge PFC branch road in the positive half cycle loop of said non-bridge PFC branch road; Said Average Current Control loop also is used for detecting the voltage at two ends, said positive half cycle shunt unit and the voltage at two ends, negative half period shunt unit respectively, thereby calculates the input current of said non-bridge PFC circuits.
2. the input current detecting device of non-bridge PFC circuits according to claim 1 is characterized in that, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads that are connected in parallel; The positive half cycle shunt of series connection unit in the positive half cycle loop of each non-bridge PFC branch road, and in the negative half period loop of each non-bridge PFC branch road series connection negative half period shunt unit.
3. the input current detecting device of non-bridge PFC circuits according to claim 2; It is characterized in that; In the positive half cycle loop of each non-bridge PFC branch road, positive half cycle shunt units in series is between the positive half cycle rectification unit and the positive unidirectional conduction device of half cycle of non-bridge PFC branch road; In the negative half period loop of each non-bridge PFC branch road, negative half period shunt units in series is between the negative half period rectification unit and the unidirectional conduction device of negative half period of non-bridge PFC branch road.
4. the input current detecting device of non-bridge PFC circuits according to claim 1 is characterized in that, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads of crisscross parallel; In positive half cycle loop, the positive half cycle rectification unit of each PFC branch road is connected in parallel to form positive half cycle rectification module, and said positive half cycle shunt unit and said positive half cycle rectification module are in series; In the negative half period loop, the negative half period rectification unit of each PFC branch road is connected in parallel to form the negative half period rectification module, and said negative half period shunt unit and said negative half period rectification module are in series.
5. the input current detecting device of non-bridge PFC circuits according to claim 4 is characterized in that, said positive half cycle shunt unit is connected between said positive half cycle rectification module and the positive unidirectional conduction device of half cycle; Said negative half period shunt unit is connected between said negative half period rectification module and the unidirectional conduction device of negative half period.
6. according to the input current detecting device of each described non-bridge PFC circuits of claim 1～4; It is characterized in that said positive half cycle shunt unit and negative half period shunt unit are constituted, constituted, perhaps are made up of a plurality of shunt parallel connections by a plurality of shunt series connection by a shunt respectively.
7. the input current detecting device of non-bridge PFC circuits according to claim 6 is characterized in that, said shunt is shunt resistance, current transformer or hall device.
8. according to the input current detecting device of the arbitrary described non-bridge PFC circuits of claim 1～4, it is characterized in that said non-bridge PFC branch road is the totem-pote circuit structure.
9. the input current detection method of a non-bridge PFC circuits, said non-bridge PFC circuits comprises at least one non-bridge PFC branch road, it is characterized in that, may further comprise the steps:
The positive half cycle shunt of series connection unit in the positive half cycle loop of said non-bridge PFC branch road, and the negative half period shunt unit of in the negative half period loop of said non-bridge PFC branch road, connecting;
Detect the voltage at two ends, said positive half cycle shunt unit and the voltage at two ends, negative half period shunt unit respectively, thereby calculate the input current of said non-bridge PFC circuits.
10. the input current detection method of non-bridge PFC circuits according to claim 7 is characterized in that, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads that are connected in parallel; The positive half cycle shunt of series connection unit in the positive half cycle loop of each non-bridge PFC branch road, and in the negative half period loop of each non-bridge PFC branch road series connection negative half period shunt unit.
11. the input current detection method of non-bridge PFC circuits according to claim 7 is characterized in that, said non-bridge PFC circuits comprises a plurality of non-bridge PFC branch roads of crisscross parallel; In positive half cycle loop, the positive half cycle rectification unit of each PFC branch road is connected in parallel to form positive half cycle rectification module, and said positive half cycle shunt unit and said positive half cycle rectification module are in series; In the negative half period loop, the negative half period rectification unit of each PFC branch road is connected in parallel to form the negative half period rectification module, and said negative half period shunt unit and said negative half period rectification module are in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110077298.2A CN102721848B (en) | 2011-03-29 | 2011-03-29 | Input current detection method and the device of non-bridge PFC circuits |
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| CN104283413A (en) * | 2013-07-01 | 2015-01-14 | 中兴通讯股份有限公司 | Method for controlling bridgeless PFC circuit and device thereof |
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| CN105527484A (en) * | 2016-02-18 | 2016-04-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Bridgeless PFC circuit current sampling device and control method thereof |
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| CN104283413B (en) * | 2013-07-01 | 2018-11-16 | 中兴通讯股份有限公司 | A kind of control method and device of non-bridge PFC circuits |
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| CN104092372B (en) * | 2014-06-30 | 2017-04-12 | 成都芯源***有限公司 | Switch regulating circuit and mean current detection circuit and method thereof |
| CN104092372A (en) * | 2014-06-30 | 2014-10-08 | 成都芯源***有限公司 | Switch regulating circuit and mean current detection circuit and method thereof |
| CN104113200B (en) * | 2014-07-01 | 2017-06-06 | 广东美芝制冷设备有限公司 | For convertible frequency air-conditioner without bridge APFC systems and its control method |
| CN104113200A (en) * | 2014-07-01 | 2014-10-22 | 广东美芝制冷设备有限公司 | Bridgeless APFC system used for variable frequency air conditioner and method for controlling the system |
| CN105281579B (en) * | 2014-07-23 | 2018-02-02 | 深圳市英威腾电气股份有限公司 | High voltage converter, control system and power cell input watt current computational methods |
| CN105281579A (en) * | 2014-07-23 | 2016-01-27 | 深圳市英威腾电气股份有限公司 | Input active current calculation method of high-voltage frequency converter, control system and power unit |
| US20160356840A1 (en) * | 2015-06-02 | 2016-12-08 | Boe Technology Group Co., Ltd. | Flexible Printed Circuit and Detecting Device, Detecting Method and Display Device Thereof |
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| CN106353588A (en) * | 2015-07-14 | 2017-01-25 | 艾默生网络能源有限公司 | Input power detecting method and device |
| CN106706995B (en) * | 2015-11-17 | 2019-08-20 | 华为技术有限公司 | A kind of inductive current detection circuit in Bridgeless power factor correction pfc circuit |
| CN106706995A (en) * | 2015-11-17 | 2017-05-24 | 华为技术有限公司 | Inductive current detection circuit in bridgeless power factor correction PFC circuit |
| CN106849692A (en) * | 2015-12-04 | 2017-06-13 | 艾默生网络能源***北美公司 | A kind of control method and device of multistate switch totem-pote circuit |
| CN105515415A (en) * | 2015-12-25 | 2016-04-20 | 美的集团武汉制冷设备有限公司 | Power conversion circuit, power conversion method and air conditioner |
| US10067166B2 (en) | 2016-01-27 | 2018-09-04 | Hynetek Semiconductor Co., Ltd. | Circuit for sampling current and system for sampling current of Totem-Pole bridgeless circuit |
| CN105634295A (en) * | 2016-01-27 | 2016-06-01 | 深圳慧能泰半导体科技有限公司 | Current sampling circuit and current sampling system for totem-pole bridgeless circuit |
| CN105527484A (en) * | 2016-02-18 | 2016-04-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Bridgeless PFC circuit current sampling device and control method thereof |
| CN106093533A (en) * | 2016-07-28 | 2016-11-09 | 深圳茂硕电子科技有限公司 | A kind of non-bridge PFC current mode sample circuit |
| CN109004850A (en) * | 2017-06-07 | 2018-12-14 | 杭州先途电子有限公司 | A kind of half-bridge active power factor correction circuit and a kind of frequency-variable controller and a kind of power circuit |
| TWI697183B (en) * | 2019-10-25 | 2020-06-21 | 國立臺灣科技大學 | Totem-pole bridgeless power factor corrector and power factor correction method |
| US11043892B2 (en) | 2019-10-25 | 2021-06-22 | National Taiwan University Of Science And Technology | Totem-pole bridgeless power factor corrector and power factor correction method |
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