CN211656002U - Resonance bridgeless boost power factor correction AC-DC converter - Google Patents

Resonance bridgeless boost power factor correction AC-DC converter Download PDF

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Publication number
CN211656002U
CN211656002U CN202020685369.1U CN202020685369U CN211656002U CN 211656002 U CN211656002 U CN 211656002U CN 202020685369 U CN202020685369 U CN 202020685369U CN 211656002 U CN211656002 U CN 211656002U
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China
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diode
power switch
switch tube
converter
capacitor
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Expired - Fee Related
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CN202020685369.1U
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Chinese (zh)
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陈景文
王依妍
王红艳
李霞
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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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

Abstract

The utility model belongs to the technical field of the soft switch of power electronics, a resonance does not have bridge power factor correction AC-DC converter is disclosed, including first electric capacity, second electric capacity, first inductance, second inductance, first diode, second diode, third diode, fourth diode, first power switch pipe and second power switch pipe. The AC-DC converter not only has inherent factor correction capability, but also can provide soft switching for all semiconductor devices, thereby effectively reducing the switching loss, improving the efficiency of the converter, ensuring the running time interval and the consumed power to be smaller, and realizing the integral running optimization of the converter; while the output voltage is regulated, the input current inherently follows the input voltage with a sinusoidal waveform, and furthermore the input current is essentially a continuous sinusoidal curve, with small ripple, without using any current loop controller, without adding additional filters at the input, making the controller simple and easy to incorporate.

Description

Resonance bridgeless boost power factor correction AC-DC converter
Technical Field
The utility model belongs to the technical field of the soft switch of power electronics, a resonance does not have bridge power factor correction AC-DC converter that steps up is related to.
Background
A large amount of harmonic and reactive current are injected into a power grid by a traditional uncontrollable and controllable rectifying circuit, so that the pollution to the power grid is caused, high attention is paid to various countries, and a plurality of international standards such as IEEE519 and IEC1000-3-2 are set for the purpose. To meet these requirements, boost-based converters have been studied with some success. Conventional boost converters have (1) a high control complexity; (2) high conduction losses of the diode; (3) the increased switching losses at higher switching frequencies reduce the converter efficiency; (4) due to the disadvantages of reduced converter performance caused by the on-resistance or parasitic resistance of the semiconductor device and the reactive element, the conventional boost converter cannot meet the operation control requirement of the high-voltage microgrid, and therefore, a boost AC-DC converter with high switching frequency and power factor is required.
Researchers have proposed using interleaved pfc converters to reduce conduction losses, which are easier to implement, use more and smaller components, and dissipate heat better, but are more difficult to design and the conduction losses are less than ideal. Another investigator has proposed using bridgeless interleaved pfc converters, i.e., eliminating the input rectifier of conventional pfc converters, in such a way that the number of semiconductor devices in the current flow path can be reduced, thereby further reducing conduction losses. However, like the interleaved pfc converter, the bridgeless interleaved pfc converter cannot provide soft switching conditions for the semiconductor device, and switching loss cannot be guaranteed.
Researchers have also proposed a bridgeless resonant Buck power factor correction converter. The converter provides soft switching conditions for the semiconductor elements and has inherent power factor correction capability, thus eliminating the current loop in the controller, making the controller circuit very simple. However, at the zero crossings of the input voltage, when the output voltage is higher than the input voltage, the input current is zero for most of its period, resulting in a discontinuity in the input current. Therefore, when the output voltage is high, a larger filter element is required to compensate for the lower power factor, increasing the implementation cost. In addition, the converter also draws discontinuous current at the input, which increases total harmonic distortion and reduces power factor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome among the above-mentioned prior art tradition boost converter control complexity height, converter inefficiency, input current discontinuity and implementation cost height's shortcoming, provide a resonance does not have bridge boost power factor correction AC-DC converter.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a resonance bridgeless boost power factor correction AC-DC converter comprises a first capacitor, a second capacitor, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a first power switch tube and a second power switch tube; the anode of the first capacitor is connected with the anode of the first diode through the first inductor, and the cathode of the first capacitor is connected with the anode of the second capacitor; the cathode of the second capacitor is connected with the cathode of the second diode through the second inductor; the anode of the third diode is connected with the cathode of the second diode, and the cathode of the third diode is connected with the cathode of the first diode; the anode of the fourth diode is connected with the anode of the second diode, and the cathode of the fourth diode is connected with the anode of the first diode; the source electrode of the first power switch tube is connected with the cathode of the first capacitor, and the drain electrode of the first power switch tube is connected with the cathode of the first diode; the source electrode of the second power switch tube is connected with the anode of the second diode and grounded, and the drain electrode of the second power switch tube is connected with the cathode of the first capacitor; when the power supply is in use, the anode of the first capacitor and the cathode of the second capacitor are respectively connected with the anode and the cathode of the voltage source, the drain electrode of the first power switch tube is connected with one end of the load, and the other end of the load is grounded.
The utility model discloses further improvement lies in:
the first power switch tube and the second power switch tube are both MOSFET tubes.
The device also comprises a first freewheeling diode and a second freewheeling diode; the anode of the first fly-wheel diode is connected with the source electrode of the first power switch tube, and the cathode of the first fly-wheel diode is connected with the drain electrode of the first power switch tube; the anode of the second freewheeling diode is connected with the source electrode of the second power switch tube, and the cathode of the second freewheeling diode is connected with the drain electrode of the second power switch tube.
The first auxiliary capacitor is connected with the first power switch tube in parallel, and the second auxiliary capacitor is connected with the second power switch tube in parallel.
The filter also comprises a filter capacitor; one end of the filter capacitor is connected with the drain electrode of the first power switch tube after being connected with the load in parallel, and the other end of the filter capacitor is grounded.
The output end of the voltage compensator is connected with the grid electrode of the first power switch tube and the grid electrode of the second power switch tube.
Compared with the prior art, the utility model discloses following beneficial effect has:
the AC-DC conversion function is realized by arranging two inductors, two power switch tubes and two groups of diodes, no current loop exists in the control loop of the whole converter, only a voltage loop is used for realizing the regulation of output voltage, so the power factor correction of the AC-DC converter is inherent, and in the voltage loop, the output voltage is generally regulated by comparing the magnitude of the output voltage with a given voltage, while the input current inherently follows the input voltage with a sinusoidal waveform, since the input current is equally distributed over the two inductors, and the current over both inductors is present at any one time, therefore, the input current is continuous, the ripple is small, so that no current loop controller can be used in design, an additional filter is not added at the input end, the controller is simple and easy to incorporate, and the implementation cost is reduced. Meanwhile, the AC-DC converter has a bridgeless structure, and the operation time interval is obviously shortened while the conduction loss is greatly reduced, so that higher efficiency can be generated, and the integral operation optimization is realized.
Furthermore, a first freewheeling diode and a second freewheeling diode are arranged, when the freewheeling diodes are conducted, the first power switch tube and the second power switch tube can be opened under the ZVS condition, and then the AC-DC converter can provide soft switching for all semiconductor devices, switching loss is obviously reduced through the soft switching technology, power consumption is reduced, and the converter can be used for the condition of higher frequency.
Furthermore, a first auxiliary capacitor and a second auxiliary capacitor are arranged, so that the voltage of the first power switch tube and the voltage of the second power switch tube cannot suddenly reach the output voltage, and turn-off loss is reduced.
Furthermore, a filter capacitor is arranged, so that an unnecessary alternating current part in the voltage can be filtered out, and the output direct current voltage is smoother.
Drawings
Fig. 1 is a circuit diagram of an AC-DC converter according to the present invention;
fig. 2 is an equivalent circuit diagram of the positive half cycle of the AC-DC converter of the present invention;
fig. 3 is an equivalent circuit diagram of the negative half cycle of the AC-DC converter of the present invention;
fig. 4 is an equivalent circuit diagram of the first operation mode of the positive half cycle of the AC-DC converter according to the present invention;
fig. 5 is an equivalent circuit diagram of the second operation mode of the positive half cycle of the AC-DC converter according to the present invention;
fig. 6 is an equivalent circuit diagram of the third operating mode of the positive half cycle of the AC-DC converter of the present invention;
fig. 7 is an equivalent circuit diagram of a fourth operating mode of the positive half cycle of the AC-DC converter according to the present invention;
fig. 8 is an equivalent circuit diagram of a fifth operation mode of the positive half cycle of the AC-DC converter according to the present invention;
fig. 9 is an equivalent circuit diagram of a sixth operating mode of the positive half cycle of the AC-DC converter according to the present invention;
fig. 10 is an equivalent circuit diagram of a seventh operating mode of the positive half cycle of the AC-DC converter according to the present invention;
fig. 11 is an equivalent circuit diagram of the eighth operating mode of the positive half cycle of the AC-DC converter of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the resonant bridgeless boost power factor correction AC-DC converter of the present invention includes a first capacitor C1A second capacitor C2A first inductor L1A second inductor L2A first diode D1A second diode D2A third diode D3A fourth diode D4A first power switch tube S1And a second power switch tube S2。
A first capacitor C1Is connected to the positive pole via a first inductor L1Connecting a first diode D1The cathode of the first capacitor is connected with the first capacitor C2The positive electrode of (1); second capacitor C2Through a second inductor L2Is connected with a second diode D2The negative electrode of (1); third diode D3Is connected with a second diode D2The negative electrode of the first diode D is connected with the negative electrode1The negative electrode of (1); fourth diode D4Is connected with a second diode D2The anode and the cathode of the diode are connected with a first diode D1The positive electrode of (1); first power switch tube S1Is connected with a first capacitor C1The drain electrode of the first diode D is connected with the cathode1The negative electrode of (1); second power switch tube S2Is connected to a second diode D2The anode of the first capacitor is grounded, and the drain of the first capacitor is connected with the first capacitor C1The negative electrode of (1); in use, the first capacitor C1Positive pole and second capacitor C2Respectively for connection to a voltage source VinPositive and negative poles of (1), a first power switch tube S1Is connected to one end of the load, and the other end of the load is grounded.
Wherein, the first power switch tube S1And a second power switch tube S2Are all MOSFET tubes, and the function of the MOSFET tubes is to reduce input current ripple.
In a preferred embodiment, the resonant bridgeless boost power factor correction AC-DC converter further comprises a first freewheeling diode and a second freewheeling diode; the anode of the first fly-wheel diode is connected with a first power switch tube S1The negative electrode of the first power switch tube S is connected with the first power switch tube1A drain electrode of (1); the anode of the second fly-wheel diode is connected with a second power switch tube S2The negative electrode of the first power switch tube is connected with the first power switch tube2Of the substrate. By arranging the freewheeling diode in anti-parallel connection, when the freewheeling diode is conducted, the first power switch tube S1And a second power switch tube S2All can be opened under ZVS conditions.
In a preferred embodiment, the resonant bridgeless boost power factor correction AC-DC converter further includes a first auxiliary capacitor and a second auxiliary capacitor, the first auxiliary capacitor and the first power switch tube S1Connected in parallel, the second auxiliary capacitor is connected with the second power switchClosing pipe S2And the parallel connection ensures that the voltage of the first power switch tube and the second power switch tube cannot suddenly reach the output voltage, thereby being beneficial to reducing the turn-off loss.
In a preferred embodiment, the resonant bridgeless boost power factor correction AC-DC converter further comprises a filter capacitor C0Filter capacitor C0One end of the first power switch tube S is connected with the load in parallel1The other end of the drain electrode is grounded, and an unnecessary alternating current part in the voltage can be filtered out by adding a filter capacitor, so that the output direct current voltage is smoother.
In a preferred embodiment, the resonant bridgeless boost power factor correction AC-DC converter further includes a voltage compensator, an output terminal of the voltage compensator and the first power switch tube S1Grid and second power switch tube S2The voltage compensator generates two complementary pulse signals through controlling the voltage signal and respectively sends the two complementary pulse signals to the first power switch tube S1And a second power switch tube S2Performing a first power switch tube S1And a second power switch tube S2On and off control of.
The principle of the present invention is described below:
referring to fig. 2 and 3, the positive and negative half cycle equivalent circuit of the AC-DC converter of the present invention is illustrated by taking the positive half cycle operation as an example, because of the symmetry of the AC-DC converter circuit and the symmetry of the AC-DC converter in the positive and negative half cycles.
Referring to fig. 4 to 11, there are eight different operation modes for one switching cycle of the AC-DC converter, and since the AC-DC converter operates symmetrically in one cycle, the four operation modes are exemplified here, which are performed in the positive part of the input voltage, and then it can be extended to the whole range. The specific operating modes are as follows:
before the first operating mode begins, a first power switch S is assumed1The first auxiliary capacitor of (a) is amplified, so that the second power switch tube S2Is fully charged to the output voltage. In addition, assume the first powerSwitch tube S1The anti-parallel freewheeling diode of (1) is turned on. At this time, the first power switch tube S1The switching current of the first power switching tube S is negative, which indicates that the freewheeling diode of the power switching tube is turned on before the power switching tube is turned on, the freewheeling diode is equivalent to a conducting wire after being turned on, and the voltage at two ends is zero, so that the first power switching tube S is connected with the power switching tube S1Can be turned on under ZVS conditions.
The first mode of operation: referring to fig. 4, when the first power switch tube S1The first freewheeling diode S starts conducting, the mode starts, and the first power switch S starts1Can be turned on under ZVS conditions. In this mode, the first power switch S1Current i ofS1Is negative and gradually decreases when iS1When zero is reached, the mode ends. Since before that, iC1To be positive and gradually reduced, a second capacitor C2Current i ofC2Is negative and gradually decreases, so that the first capacitance C1And a second capacitor C2Is also at iS1And becomes zero when it reaches zero.
The second working mode is as follows: referring to fig. 5, flows through the first diode D1And a first power switch tube S1Is still supplying current to the first inductor L1Charging while the second inductor L2Through a second diode D2And a first power switch tube S1Providing a load to the circuit. After the first mode of operation, the first inductance L1And a second inductance L2Is positive, flows from the drain to the source of the first power switch S1; during this time, the first inductance L1Current i ofL1Increased simultaneous second inductance L2Current i ofL2Decrease when iL2Near zero, the second diode D2Also gradually becomes zero so that the second diode D2Turn off under ZCS condition (to be explained) to stop the second inductor L2Supply and filter capacitor C0Power is supplied and the mode ends. During this period iC1Is negative and gradually increases, iC2Is positive and gradually increases.
The third mode of operation: see fig. 6, as long as the second diode D2Off, the mode is on. During this time, flows through the first diode D1And a first power switch tube S1Is still supplying current to the first inductor L1Is charged so that iL1Continuously rising, while i is due to the action of the second mode of operationL2Is always zero. Turn off the first power switch tube S1Can the mode be ended, during which iC1Still negative and increasing, iC2Is positive and gradually increases.
A fourth mode of operation: referring to fig. 7, since the first power switch S1Is turned off, resulting in the first power switch tube S1And a second power switch tube S2Is turned off. At the same time, iL1Reaches a maximum value, i, in one switching cycleL2Still always zero. Since the current of the inductor does not suddenly change, iL1Cannot reach zero instantaneously but passes through the first power switch tube S1And a second power switch tube S2The first auxiliary capacitor and the second auxiliary capacitor follow current, namely, the current is supplied to the first power switch tube S1The first auxiliary capacitor of the first power switch tube S is charged to supply the second power switch tube S2The second auxiliary capacitance of (2) is discharged. When the second power switch tube S2When the voltage on the second auxiliary capacitor reaches zero, iL1Will flow through the second power switch tube S2The anti-parallel free-wheeling diode of (1), this mode ends. During this period, the second power switch tube S2The second auxiliary capacitor can be discharged or the second power switch tube S2Turn on under ZVS conditions when the freewheeling diode of (a) is conducting.
In summary, in the positive part of the input voltage, the magnitude of the current flowing through the load is always the first inductor L1Or the second inductance L2The original value or partial value of the current, and combining the above analysis, when the first inductor L1Or the second inductance L2Is reduced to zero, a first diode D connected in series with it1Or a second diode D2Will be turned off to this point iL1Or iL2Will continue to be zero, knowing the first diode D1Or a second diode D2And then reopened. Thus flowing through the negativeThe load current is always positive, and the load voltage is also always continuously positive; conversely, in the negative part of the input voltage, the load voltage is continuously negative all the time.
Due to the symmetry in the circuit, the next four operation modes, i.e., the fifth to eighth operation modes, are similar to the first to fourth operation modes, respectively, and will not be described in detail here.
To sum up, the utility model discloses resonance does not have bridge power factor correction AC-DC converter that steps up:
since there is no current loop in the entire converter control loop, only the voltage loop is used to achieve regulation of the output voltage, the power factor correction of the AC-DC converter is inherent, and in the voltage compensator loop, the output voltage is generally regulated by comparing the output voltage with the magnitude of a given voltage, while the input current inherently follows the input voltage with a sinusoidal waveform, since the input current will be evenly distributed to the first inductor L1And a second inductance L2And at any one time there is a first inductance L1And a second inductance L2The input current is continuous, the ripple is small, so that no current loop controller is used in design, no additional filter is added at the input end, the controller is simple and easy to incorporate, and the implementation cost is reduced. Meanwhile, when the freewheeling diodes connected in parallel reversely to the power switching tubes are conducted, the switching current of the power switching tubes is negative, which indicates that the freewheeling diodes of the switches are conducted before the switches are conducted, the freewheeling diodes are equivalent to a conducting wire after being conducted, and the voltages at two ends are zero, so that the power switching tubes can be opened under the ZVS condition, that is, the ZVS is provided for the MOSFET; when the current through the diode also gradually goes to zero, the diode will turn off under ZCS conditions, i.e. provide ZCS when the diode is turned off; i.e. the first power switch tube S1And a second power switch tube S2Both can be turned on under ZVS condition, the diodes first D and second D2Can be turned off under ZCS condition, and the AC-DC converter can provide soft switching for all semiconductor devices, thereby significantly reducing switching loss and power consumption by soft switching technologyThe converter can be used for higher frequency conditions and the AC-DC converter has a bridgeless structure, the operating time interval is significantly shortened while the conduction losses are greatly reduced, thus resulting in higher efficiency and achieving overall operational optimization. At the same time, the first power switch tube S1And a second power switch tube S2All are connected in parallel with auxiliary capacitors to ensure the first power switch tube S1And a second power switch tube S2Does not suddenly reach the output voltage, thereby helping to reduce turn-off loss.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims (6)

1. A resonance bridgeless boost power factor correction AC-DC converter is characterized by comprising a first capacitor, a second capacitor, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a first power switch tube and a second power switch tube;
the anode of the first capacitor is connected with the anode of the first diode through the first inductor, and the cathode of the first capacitor is connected with the anode of the second capacitor; the cathode of the second capacitor is connected with the cathode of the second diode through the second inductor; the anode of the third diode is connected with the cathode of the second diode, and the cathode of the third diode is connected with the cathode of the first diode; the anode of the fourth diode is connected with the anode of the second diode, and the cathode of the fourth diode is connected with the anode of the first diode;
the source electrode of the first power switch tube is connected with the cathode of the first capacitor, and the drain electrode of the first power switch tube is connected with the cathode of the first diode; the source electrode of the second power switch tube is connected with the anode of the second diode and grounded, and the drain electrode of the second power switch tube is connected with the cathode of the first capacitor;
when the power supply is in use, the anode of the first capacitor and the cathode of the second capacitor are respectively connected with the anode and the cathode of the voltage source, the drain electrode of the first power switch tube is connected with one end of the load, and the other end of the load is grounded.
2. The resonant bridgeless boost power factor correction AC-DC converter according to claim 1, wherein said first power switch tube and said second power switch tube are both MOSFET tubes.
3. A resonant bridgeless boost power factor corrected AC-DC converter according to claim 1, further comprising a first freewheeling diode and a second freewheeling diode; the anode of the first fly-wheel diode is connected with the source electrode of the first power switch tube, and the cathode of the first fly-wheel diode is connected with the drain electrode of the first power switch tube; the anode of the second freewheeling diode is connected with the source electrode of the second power switch tube, and the cathode of the second freewheeling diode is connected with the drain electrode of the second power switch tube.
4. The resonant bridgeless boost power factor correction AC-DC converter according to claim 1, further comprising a first auxiliary capacitor connected in parallel with the first power switch and a second auxiliary capacitor connected in parallel with the second power switch.
5. The resonant bridgeless boost power factor corrected AC-DC converter according to claim 1, further comprising a filter capacitor; one end of the filter capacitor is connected with the drain electrode of the first power switch tube after being connected with the load in parallel, and the other end of the filter capacitor is grounded.
6. The resonant bridgeless boost power factor correction AC-DC converter according to claim 1, further comprising a voltage compensator having an output connected to both the gate of the first power switch and the gate of the second power switch.
CN202020685369.1U 2020-04-28 2020-04-28 Resonance bridgeless boost power factor correction AC-DC converter Expired - Fee Related CN211656002U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112332652A (en) * 2020-10-26 2021-02-05 电子科技大学 Bridgeless power factor correction circuit based on resonant switch capacitor converter
CN113193764A (en) * 2021-04-08 2021-07-30 广东工业大学 Power factor correction rectifier of wireless power transmission system receiving end
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112332652A (en) * 2020-10-26 2021-02-05 电子科技大学 Bridgeless power factor correction circuit based on resonant switch capacitor converter
CN112332652B (en) * 2020-10-26 2021-09-14 电子科技大学 Bridgeless power factor correction circuit based on resonant switch capacitor converter
CN113193764A (en) * 2021-04-08 2021-07-30 广东工业大学 Power factor correction rectifier of wireless power transmission system receiving end
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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