CN202059338U - Alternating-current rectifier circuit with PFC (power factor correction) function - Google Patents
Alternating-current rectifier circuit with PFC (power factor correction) function Download PDFInfo
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- CN202059338U CN202059338U CN2011201391485U CN201120139148U CN202059338U CN 202059338 U CN202059338 U CN 202059338U CN 2011201391485 U CN2011201391485 U CN 2011201391485U CN 201120139148 U CN201120139148 U CN 201120139148U CN 202059338 U CN202059338 U CN 202059338U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model relates to an alternating-current rectifier circuit with a PFC (power factor correction) function, which comprises control switches, synchronous rectifier tubes and a current detection circuit unit. Four control switches and two synchronous rectifier tubes are respectively controlled by external control signals so as to realize synchronous rectification. The control switches and the synchronous rectifier tubes can adopt insulated gate bipolar transistors or N-channel field-effect transistors. When the alternating-current rectifier circuit is in operation, the insulated gate bipolar transistors or the N-channel field-effect transistors are all in a saturation power-on state or power-off state whether the circuit is in alternating-current positive half cycle or negative half cycle or not, and a rectifier diode is not powered on. When the circuit is in certain operating current, saturation power-on voltage drop of the insulated gate bipolar transistors is lower than diode power-on voltage drop, and accordingly power-on loss is reduced and efficiency is improved. The used insulated gate bipolar transistors (IGBT) without devices of an antiparallel diode guarantees detecting accuracy of the current detection circuit unit, power factor is increased to the maximum extent, and current harmonics are reduced.
Description
Technical field
The utility model relates to PFC (power factor correction) technology and AC rectification technical field, specifically is meant a kind of circuit that can realize AC rectification function and power factor emendation function simultaneously.
Background technology
Power factor is to weigh an important indicator of electric equipment performance.Power factor (Power Factor) is meant and exchanges input active power (P) and the ratio of importing apparent power (S).Power factor can be weighed the degree that electric power is used effectively, and when power factor value is big more, represents its electric power utilance high more.Power factor correction (Power Factor Correction) is to make input ac voltage and input AC electric current same-phase, makes the input current sineization, and then allows power factor level off to 1.
As Fig. 1, be a kind of single phase alternating current (A.C.) input power factor correcting circuit commonly used at present.This circuit comprises the two-stage circuit structure.The ac rectifier that first order structure is made up of diode D1, D2, D3, D4; The second level BOOST booster circuit that first order structure is made up of pfc controller, inductance L 1, switching tube Q1, current sense resistor R1, diode D1, filter capacitor C1.When switching tube Q1 conducting, at the positive and negative half-wave of alternating current, two diode current flows are arranged all, two diodes end, and the total loss of semiconductor is that the conduction loss of switching tube Q1 adds two diode forward conduction losses; When switching tube Q1 turn-offs, at the positive and negative half-wave of alternating current, three diode current flows are arranged all, two diodes end, and the total loss of semiconductor is three diode forward conduction losses.The rectifier diode of the large power supply of general band power factor emendation function surpasses 0.7V in the forward voltage drop that flows through under the current state, and as seen the power loss of existing FPC circuit shown in Figure 1 is bigger, and system effectiveness is low, and heating is serious.
The non-rectifying bridge power factor correction technology has appearred in the power loss during for the minimizing diode current flow, and Fig. 2 is the non-rectifying bridge circuit of power factor correction of a kind of monocycle control in the prior art.This circuit working principle is, switched field effect pipe Q1 and switched field effect pipe Q2 alternate conduction, positive half cycle at alternating current, switched field effect pipe Q1 conducting, Q2 turn-off, the loop circulation that alternating current is formed through electromagnetic interface filter, energy storage inductor L1, switching tube Q1, current sense resistor, diode D2, energy storage inductor L1 energy storage; When switched field effect pipe Q1 turn-offs, diode D3 conducting, the loop that the energy storage of inductance L 1 is formed through electromagnetic interface filter, diode D3, filter capacitor C1, load, current sense resistor, diode D2, AC network releases energy; In the negative half period switched field effect pipe Q2 of alternating current conducting, when Q1 turn-offs, the loop circulation that alternating current is formed through electromagnetic interface filter, energy storage inductor L2, switching tube Q2, current sense resistor, diode D1, energy storage inductor L2 energy storage; When switched field effect pipe Q2 turn-offs, diode D4 conducting, the loop that the energy storage of inductance L 2 is formed through electromagnetic interface filter, diode D4, filter capacitor C1, load, current sense resistor, diode D1, AC network releases energy.As seen, when the positive half cycle switched field effect pipe Q1 conducting of alternating current, a diode current flow is arranged, the total loss of semiconductor this moment is the conduction loss that switched field effect pipe Q1 conduction loss adds a diode, when switched field effect pipe Q1 turn-offs, two diode current flows are arranged, and semiconductor total loss this moment is two diode current flow losses, and is similar in the loss of the loss situation of the negative half-wave of alternating current and positive half wave.
The non-rectifying bridge FPC circuit of monocycle shown in Figure 2 control has reduced the loss of a diode when each alternation than the pfc circuit of single phase alternating current (A.C.) input shown in Figure 1, improved efficient, reduced caloric value, but also there is following shortcoming in circuit shown in Figure 2:
1, the control switch device has adopted field effect transistor, and field effect transistor has ptc characteristics, and under hot conditions, the channel resistance of field effect transistor can become greatly, makes conduction loss increase;
2, field effect transistor is the device with parasitic body diode, in circuit, has the parasitic body diode that the partial inductance electric current flows through field effect transistor, makes current detecting error occur, causes current distortion, and power factor descends;
3, when the conducting of control switch field effect transistor, have a diode current flow loss at least, and when the control switch field effect transistor is turn-offed, two diode current flow losses are arranged, therefore, the conduction loss of diode is still bigger, still has the space of reduction;
4, when PFC control switch device adopts field effect transistor, because of the channel resistance of field effect transistor generally more than tens bold and unconstrained Europe, when operating current reaches more than the 10A, the conduction loss of field effect transistor also can be bigger, therefore, under the situation of big operating current, be not suitable for field effect transistor as PFC control switch device.
Summary of the invention
The technical problem that the utility model need solve provides a kind of ac rectifier of the PFC of having function, and this circuit can be realized:
(1), solves the problem that conduction loss that the field effect transistor as the PFC control switch causes because of positive temperature coefficient increases under hot conditions;
(2), solve the current detecting error problem;
(3), reduce power semiconductor to greatest extent at the conduction loss that flows through under the current state;
(4), reduce the loss ratio bigger problem of PFC control switch device under big operating current situation.
For solving the problems of the technologies described above, technical solution adopted in the utility model is:
A kind of ac rectifier of the PFC of having function is provided, comprises first, second synchronous rectifier that is series in the ac circuit, first, second rectifier diode, first to fourth control switch and current detection circuit unit.
The collector electrode of described first control switch, the 4th control switch emitter-base bandgap grading are connected in first ac input end, and link to each other with the first synchronous rectification pipe collector and the first rectifier diode anode; The collector electrode of second control switch, the drain electrode of the 3rd control switch are connected in second ac input end, and link to each other with the second synchronous rectification pipe collector and the second rectifier diode anode; The first control switch emitter-base bandgap grading links to each other with the second control switch emitter-base bandgap grading and ground connection, and the 3rd control switch collector electrode links to each other with the 4th control switch collector electrode, and the current detection circuit unit is connected between this collector electrode and ground that links to each other; First, second synchronous rectifier emitter-base bandgap grading links to each other, and links to each other with first rectifier diode, the second rectifier diode negative electrode, connects load as the ac rectifier output jointly; The described first control switch grid, the second control switch grid, the 3rd control switch grid, the 4th control switch grid are accepted external control signal respectively and are controlled its turn-on and turn-off; The described first synchronous rectification tube grid and the second synchronous rectification tube grid are accepted the control of external sync rectified signal respectively and are realized synchronous rectification.
Preferably, described ac rectifier also comprises electromagnetic interface filter, and AC power exports ac input end to after by electromagnetic interface filter filtering.
Preferred, described ac rectifier also comprises first boost inductance and second boost inductance; Described first boost inductance, one end connects the electromagnetic interface filter output, and the other end is as the first rectification input that boosts, and described second boost inductance, one end connects another output of electromagnetic interface filter, and the other end is as the second rectification input that boosts.
At problem to be solved in the utility model, the utility model also provides a kind of similar solution, be a kind of ac rectifier of the PFC of having function, comprise first, second synchronous rectifier that is series in the ac circuit, first to fourth control switch and current detection circuit unit.
The collector electrode of described first control switch, the drain electrode of the 4th control switch are connected in first ac input end, and link to each other with the first synchronous rectifier source electrode; The collector electrode of second control switch, the drain electrode of the 3rd control switch are connected in second ac input end, and link to each other with the second synchronous rectifier source electrode; The first control switch emitter-base bandgap grading links to each other with the second control switch emitter-base bandgap grading and ground connection, and the 3rd control switch source electrode links to each other with the 4th control switch source electrode, and the current detection circuit unit is connected between this source electrode and ground that links to each other; First, second synchronous rectifier drain electrode links to each other and connects load as the ac rectifier output; The described first control switch grid, the second control switch grid, the 3rd control switch grid, the 4th control switch grid are accepted external control signal respectively and are controlled its turn-on and turn-off; The described first synchronous rectification tube grid and the second synchronous rectification tube grid are accepted the control of external sync rectified signal respectively and are realized synchronous rectification.
Equally, the preferred version of such scheme is as follows: described ac rectifier also comprises electromagnetic interface filter, and AC power exports ac input end to after by electromagnetic interface filter filtering.
The more preferably scheme of such scheme is as follows: described ac rectifier also comprises first boost inductance and second boost inductance; Described first boost inductance, one end connects the electromagnetic interface filter output, and the other end is as first ac input end, and described second boost inductance, one end connects another output of electromagnetic interface filter, and the other end is as second ac input end.
With respect to prior art, the beneficial effects of the utility model are:
1), PFC control switch device adopts the insulated gate bipolar transistor IGBT of negative temperature coefficient, under hot conditions, conduction loss can be lower, can not increase;
2), the inductive current of pfc circuit all flows through current detecting unit, makes current detecting accurate, improved power factor, reduced current distortion;
3), all power semiconductors all are operated in saturation conduction and by off state, the conduction loss of the saturation conduction loss ratio diode of power semiconductor is much lower, so efficient is greatly improved in the circuit;
4), in the power supply of the high-power big electric current of band PFC function, because of PFC control switch device and synchronous rectifier adopt the insulated gate bipolar transistor (IGBT) of negative temperature coefficient, make loss reduce, efficient improves, heating reduces.
Description of drawings
Fig. 1 is the pfc circuit schematic diagram that single phase alternating current (A.C.) commonly used in the prior art is imported;
Fig. 2 is the non-rectifying bridge pfc circuit schematic diagram of a kind of monocycle control in the prior art;
Fig. 3 is ac rectifier embodiment one schematic diagram of the PFC of having function described in the utility model;
Fig. 4 is ac rectifier embodiment two schematic diagrams of the PFC of having function described in the utility model;
Fig. 5 is the ac rectifier control timing figure that the utlity model has the PFC function.
Embodiment
For the ease of those skilled in the art will recognize that the technical solution of the utility model is described in further detail below in conjunction with specific embodiment and accompanying drawing.
Fig. 3 is described ac rectifier embodiment circuit theory schematic diagram with PFC function.
In this embodiment circuit, described ac rectifier comprises electromagnetic interface filter, BOOST boost inductance, control switch, synchronous rectifier, rectifier diode, current detection circuit unit and filter capacitor.Wherein, the BOOST boost inductance comprises boost inductance L1 and boost inductance L2.Control switch comprises control switch Q1, control switch Q2, control switch Q3 and control switch Q4.
In the present embodiment, control switch Q1 and control switch Q2 adopt insulated gate bipolar transistor IGBT, and control switch Q3 and control switch Q4 can adopt insulated gate bipolar transistor IGBT, also can adopt N channel field-effect pipe.Equally, synchronous rectifier can adopt insulated gate bipolar transistor IGBT, also can adopt N channel field-effect pipe, and it specifically comprises the first synchronous rectifier Q5 and the second synchronous rectifier Q6.Described rectifier diode comprises the first rectifier diode D1 and the second rectifier diode D2.Described current detection circuit unit can adopt resistance, also can adopt current transformer or current Hall transducer.
In the circuit, the drive waveforms of the grid G 1 of control switch Q1, Q2, Q3, Q4 and synchronous rectifier Q5, Q6, G2, G3, G4, G5, G6 as shown in Figure 5.
When the positive half cycle of alternating current, the pulse signal of the grid G 1 input variable duty ratio of control switch Q1 is controlled its conducting or shutoff; The grid G 3 of control switch Q3 is because of being input as high level saturation conduction always; The input of the grid G 2 of control switch Q2 and the grid G 4 of control switch Q4 all is a low level always, so Q2 and Q4 all end.The paraphase drive waveform signal of grid G 5 inputs of synchronous rectifier Q5 and grid G 1 control wave of control switch Q1, grid G 6 inputs of synchronous rectifier Q6 then are low level always, therefore Q6 is in cut-off state always, and this moment, circuit working was at BOOST Active Power Factor Correction state.Because of influenced by the switching speed of synchronous rectifier Q5, the first rectifier diode D1 will will lag behind synchronous rectifier Q5 and turn-off prior to synchronous rectifier Q5 conducting.
When the alternating current negative half period, to change the pulse signal of the grid G 2 input variable duty ratio of being control switch Q2 and control its conducting or shutoff, the grid G 4 of the 4th control switch Q4 is because of being input as high level saturation conduction always; The input of the grid G 1 of control switch Q1 and the grid G 3 of control switch Q3 all is a low level always, so Q1 and Q3 all end.The paraphase drive waveform signal of grid G 6 inputs of the second synchronous rectifier Q6 and grid G 2 control waves of control switch Q2; The input of the grid G 5 of synchronous rectifier Q5 is a low level always, and Q5 is in cut-off state always.Circuit working this moment the same BOOST Active Power Factor Correction state the time with the positive half cycle of alternating current.Equally, the second rectifier diode D2 will will lag behind synchronous rectifier Q6 and turn-off prior to synchronous rectifier Q6 conducting.
During work, this embodiment circuit is because of the influence of the operating rate that is subjected to employed control switch device, between control switch Q4 and the control switch Q1, between control switch Q3 and the control switch Q2, between control switch Q1 and the synchronous rectifier Q5 and all will leave certain Dead Time between control switch Q2 and the synchronous rectifier Q6, otherwise, can cause dysfunction.
By last surface analysis as can be known, in the path of operating current, no matter be positive half cycle of alternating current or negative half period, all power semiconductors all are in the saturation conduction state, diodeless conducting state, and diode current flow pressure drop of insulated gate bipolar transistor IGBT saturation conduction pressure drop ratio and the pressure drop of field effect transistor saturation conduction are low, thereby have reduced conduction loss, have improved efficient; Employed insulated gate bipolar transistor IGBT all is devices of not being with the inverse parallel diode, guaranteed that the current detection circuit unit can detect the complete inductance L 1 current signal current input signal that control needs as PFC, thereby current detecting is reliably accurate, improve power factor to greatest extent, reduced current harmonics.
Fig. 4 is another embodiment circuit theory diagrams of the utility model.Described in this embodiment in the ac rectifier, AC power is exported to the first boost inductance L1 and the second boost inductance L2 after by electromagnetic interface filter filtering, and the first boost inductance L1, one end is as ac input end L, and the second boost inductance L2 is as ac input end N.The collector electrode of the first control switch Q1, the 4th control switch Q4 drain electrode are connected in the first ac input end L, and link to each other with the first synchronous rectifier Q5 source electrode; The collector electrode of the second control switch Q2, the 3rd control switch Q3 drain electrode are connected in the second ac input end N, and link to each other with the second synchronous rectifier Q6 source electrode; The first control switch Q1 emitter-base bandgap grading links to each other with the second control switch Q2 emitter-base bandgap grading and ground connection, and the 3rd control switch Q3 source electrode links to each other with the 4th control switch Q4 source electrode, and the current detection circuit unit is connected between this source electrode and ground that links to each other; First, second synchronous rectifier Q5, Q6 drain electrode links to each other and connects load as the ac rectifier output, and this output also is connected with filter capacitor C1.The described first control switch Q1 grid, the second control switch Q2 grid, the 3rd control switch Q3 grid, the 4th control switch Q4 grid are accepted external control signal respectively and are controlled its turn-on and turn-off; The described first synchronous rectifier Q5 grid and the second synchronous rectifier Q6 grid are accepted the control of external sync rectified signal respectively and are realized synchronous rectification.
This circuit working principle is similar with circuit shown in Figure 3.Different is, grid G 3 drive waveforms of control switch Q3 are that the collector electrode C2 with control switch Q2 is a reference point among Fig. 3, grid G 4 drive waveforms of control switch Q4 are that the collector electrode C1 with control switch Q1 is a reference point, and the grid G 5 of synchronous rectifier Q5 and Q6, the drive waveforms of G6 are that the anode with output is a reference point.And the drive waveforms of the grid G 3 of control switch Q3, Q4, G4 all is to be reference point with the B of current detection circuit unit end among Fig. 4, synchronous rectifier Q5 grid G 5 is that the collector electrode C1 with control switch Q1 is a reference point, and synchronous rectifier Q6 grid G 6 is that the collector electrode C2 with control switch Q2 is a reference point.
Need to prove; above-mentioned execution mode only is the preferable embodiment of the utility model; it can not be interpreted as restriction to the utility model protection range; do not breaking away under the utility model design prerequisite, any minor variations that the utility model is done with modify the protection range that all belongs to this utility model.
Claims (8)
1. the ac rectifier that has the PFC function, comprise first, second synchronous rectifier (Q5, Q6) that is series in the AC rectification loop, first, second rectifier diode (D1, D2), first to fourth control switch (Q1, Q2, Q3, Q4) and current detection circuit unit, it is characterized in that
The collector electrode of described first control switch (Q1), the 4th control switch (Q4) emitter-base bandgap grading are connected in the first rectification input (C) that boosts, and link to each other with first synchronous rectifier (Q5) collector electrode and first rectifier diode (D1) anode;
The collector electrode of second control switch (Q2), the 3rd control switch (Q3) emitter-base bandgap grading are connected in the second rectification input (D) that boosts, and link to each other with second synchronous rectifier (Q6) collector electrode and second rectifier diode (D2) anode;
First control switch (Q1) emitter-base bandgap grading links to each other with second control switch (Q2) emitter-base bandgap grading and connects output ground, the 3rd control switch (Q3) collector electrode links to each other with the 4th control switch (Q4) collector electrode, and the current detection circuit unit is connected between this collector electrode that links to each other and the output ground;
First, second synchronous rectifier (Q5, Q6) emitter-base bandgap grading links to each other, and links to each other with first rectifier diode (D1), second rectifier diode (D2) negative electrode, jointly as the ac rectifier output plus terminal and connect load;
Described first control switch (Q1) grid, second control switch (Q2) grid, the 3rd control switch (Q3) grid, the 4th control switch (Q4) grid are accepted external control signal respectively and are controlled its turn-on and turn-off; Described first synchronous rectifier (Q5) grid and second synchronous rectifier (Q6) grid are accepted the control of external sync rectified signal respectively and are realized synchronous rectification.
2. the ac rectifier with PFC function according to claim 1 is characterized in that, also comprises electromagnetic interface filter, and AC power exports the L end after by electromagnetic interface filter filtering to and N holds.
3. the ac rectifier with PFC function according to claim 2 is characterized in that, also comprises first boost inductance (L1) and second boost inductance (L2); Described first boost inductance (L1) end connects electromagnetic interface filter output L end, the other end is as the first rectification input (C) that boosts, described second boost inductance (L2) end connects another output of electromagnetic interface filter N end, and the other end is as the second rectification input (D) that boosts.
4. the ac rectifier with PFC function according to claim 3 is characterized in that, described ac rectifier output is connected with filter capacitor (C1).
5. the ac rectifier that has the PFC function comprises first, second synchronous rectifier (Q5, Q6) that is series in the AC rectification loop, and first to fourth control switch (Q1, Q2, Q3, Q4) and current detection circuit unit is characterized in that,
The drain electrode of the collector electrode of described first control switch (Q1), the 4th control switch (Q4) is connected in the first rectification input (C) that boosts, and links to each other with first synchronous rectifier (Q5) source electrode;
The drain electrode of the collector electrode of second control switch (Q2), the 3rd control switch (Q3) is connected in the second rectification input (D) that boosts, and links to each other with second synchronous rectifier (Q6) source electrode;
First control switch (Q1) emitter-base bandgap grading links to each other with second control switch (Q2) emitter-base bandgap grading and connects output ground, the 3rd control switch (Q3) source electrode links to each other with the 4th control switch (Q4) source electrode, and the current detection circuit unit is connected between this source electrode that links to each other and the output ground;
The drain electrode of first, second synchronous rectifier (Q5, Q6) links to each other as the ac rectifier output plus terminal and is connected to load;
Described first control switch (Q1) grid, second control switch (Q2) grid, the 3rd control switch (Q3) grid, the 4th control switch (Q4) grid are accepted external control signal respectively and are controlled its turn-on and turn-off; Described first synchronous rectifier (Q5) grid and second synchronous rectifier (Q6) grid are accepted the control of external sync rectified signal respectively and are realized synchronous rectification.
6. the ac rectifier with PFC function according to claim 5 is characterized in that, also comprises electromagnetic interface filter, and AC power exports L end N end after by electromagnetic interface filter filtering to.
7. the ac rectifier with PFC function according to claim 6 is characterized in that, also comprises first boost inductance (L1) and second boost inductance (L2); Described first boost inductance (L1) end connects electromagnetic interface filter output L end, the other end is as the first rectification input (C) that boosts, described second boost inductance (L2) end connects another output of electromagnetic interface filter N end, and the other end is as the second rectification input (D) that boosts.
8. the ac rectifier with PFC function according to claim 7 is characterized in that, described ac rectifier output is connected with filter capacitor (C1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201391485U CN202059338U (en) | 2011-05-05 | 2011-05-05 | Alternating-current rectifier circuit with PFC (power factor correction) function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201391485U CN202059338U (en) | 2011-05-05 | 2011-05-05 | Alternating-current rectifier circuit with PFC (power factor correction) function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170238A (en) * | 2011-05-05 | 2011-08-31 | 天宝电子（惠州）有限公司 | AC (alternating-current) rectifying circuit with PFC (power factor correction) function |
| CN104953917A (en) * | 2015-06-30 | 2015-09-30 | 广东美的制冷设备有限公司 | Input current open-loop amplitude limiting method and system during grid voltage drop of air conditioning system |
| CN115483823A (en) * | 2022-09-21 | 2022-12-16 | 钰泰半导体股份有限公司 | Switching power factor corrector and AC/DC converter |
-
2011
- 2011-05-05 CN CN2011201391485U patent/CN202059338U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170238A (en) * | 2011-05-05 | 2011-08-31 | 天宝电子（惠州）有限公司 | AC (alternating-current) rectifying circuit with PFC (power factor correction) function |
| CN102170238B (en) * | 2011-05-05 | 2013-02-20 | 天宝电子（惠州）有限公司 | AC (alternating-current) rectifying circuit with PFC (power factor correction) function |
| CN104953917A (en) * | 2015-06-30 | 2015-09-30 | 广东美的制冷设备有限公司 | Input current open-loop amplitude limiting method and system during grid voltage drop of air conditioning system |
| CN115483823A (en) * | 2022-09-21 | 2022-12-16 | 钰泰半导体股份有限公司 | Switching power factor corrector and AC/DC converter |
| CN115483823B (en) * | 2022-09-21 | 2024-01-19 | 钰泰半导体股份有限公司 | Switching power factor corrector and AC/DC converter |
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