CN112689363A - Power converter - Google Patents
Power converter Download PDFInfo
- Publication number
- CN112689363A CN112689363A CN202110080657.3A CN202110080657A CN112689363A CN 112689363 A CN112689363 A CN 112689363A CN 202110080657 A CN202110080657 A CN 202110080657A CN 112689363 A CN112689363 A CN 112689363A
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- power converter
- terminal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 48
- 238000001514 detection method Methods 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 7
- 238000004146 energy storage Methods 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The application discloses power converter through set up passive boost circuit between rectifier circuit and resonant circuit, can make power converter realize good power factor, low total harmonic distortion in order to adapt to the application occasion of LED drive power.
Description
Technical Field
The invention relates to the power electronic technology, in particular to a power converter.
Background
In recent years, users have higher and higher requirements for LED driving power supplies, for example, low harmonic, high PF value, no stroboflash, small size, high efficiency, and low cost, because a conventional bridge rectifier and capacitor filter circuit adopted by a common LED driving power supply can cause serious waveform distortion of AC input current, and a large amount of higher harmonics are injected into a power grid, a power factor at the power grid side is not high, and the large amount of higher harmonics cause serious harmonic pollution and interference to the power grid and other electrical devices, so that the other electrical devices cannot normally operate, and therefore, in order to reduce harmonic interference, a power factor correction circuit (i.e., PFC) is added in the LED driving power supply to increase the power factor in the LED driving power supply, thereby reducing harmonic interference.
Various passive switching Power Factor Correction (PFC) circuits exist that generally enable products to meet regulatory requirements at a lower cost by enabling the output current of the load to have a high ripple content. However, in many applications it is desirable that the current through the output load be substantially constant and have a low ripple content. For example, in the case of LED lighting, a constant output current with low ripple content has the advantage of providing high efficiency and long lifetime, as well as high quality light output without flicker.
Disclosure of Invention
In view of the above, the present invention provides a power converter to solve the problem that the conventional passive switching Power Factor Correction (PFC) circuit cannot be applied to an LED driving power supply.
According to an embodiment of the present invention, there is provided a power converter including: a rectifying circuit for rectifying an ac input voltage to output a dc bus voltage;
the resonant circuit comprises a switching circuit and a resonant inductor and is used for converting the direct current bus voltage into output voltage or output current so as to supply power to a load;
and the booster circuit is connected between the rectifying circuit and the resonant circuit and is driven by the inductive current flowing through the resonant inductor so as to obtain higher power factor, wherein the booster circuit comprises a first booster circuit and a second booster circuit which are connected in parallel.
Preferably, a first end of the boost circuit is connected to an output end of the rectifier circuit, a second end of the boost circuit is connected to an input end of the switch circuit, and a third end of the boost circuit is coupled to the resonant inductor through a primary winding of a transformer.
Preferably, the first boost circuit includes a first diode, a second diode connected in series and in the same direction as the first diode, and a first capacitor having one end connected to a common node of the first diode and the second diode and the other end coupled to the resonant inductor.
Preferably, the first boost circuit further comprises a third capacitor, one end of the third capacitor is connected to a common node of the first diode and the second diode, and the other end of the third capacitor is connected to a reference ground or a positive output end of the rectifying circuit.
Preferably, the first boost circuit further comprises a third capacitor connected in parallel to both ends of the first diode.
Preferably, the first boost circuit further includes a third capacitor connected in parallel to both ends of the second diode.
Preferably, the second boost circuit includes a third diode, a fourth diode connected in series and in the same direction as the third diode, and a second capacitor having one end connected to a common node of the third diode and the fourth diode and the other end coupled to the resonant inductor.
Preferably, an energy storage capacitor is connected across two input ends of the switching circuit.
Preferably, a first end of the boost circuit is connected to the positive output end of the rectifying circuit, a second end of the boost circuit is connected to the positive input end of the switching circuit, and a third end of the boost circuit is coupled to the resonant inductor, wherein a negative input end of the switching circuit is connected to a ground reference.
Preferably, the anode of the first diode is connected to the positive output end of the rectifying circuit, the cathode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to the positive input end of the switching circuit; the anode of the third diode is connected to the positive output end of the rectifying circuit, the cathode of the third diode is connected to the anode of the fourth diode, and the cathode of the fourth diode is connected to the positive input end of the switching circuit.
Preferably, a first terminal of the boost circuit is connected to the negative output terminal of the rectifying circuit, a second terminal of the boost circuit is connected to the negative input terminal of the switching circuit, and a third terminal of the boost circuit is coupled to the resonant inductor, wherein the negative input terminal of the switching circuit is connected to a reference ground.
Preferably, the cathode of the first diode is connected to the negative output end of the rectifying circuit, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected to the negative input end of the switching circuit; the cathode of the third diode is connected to the negative output end of the rectifying circuit, the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected to the negative input end of the switching circuit.
Preferably, an output terminal of the switching circuit is coupled to the resonant inductor, and a detection circuit for obtaining a current detection signal representing the output current is connected in series with the resonant inductor.
Preferably, the control circuit is further included to generate a control signal of a power transistor in the switching circuit according to the error between the current detection signal and the reference value, so that the output voltage or the output current meets the power supply requirement of the load.
Preferably, a filter capacitor is connected across two output terminals of the rectifier circuit.
The passive booster circuit is arranged between the rectifying circuit and the resonant circuit, so that the power converter can realize good power factor and low total harmonic distortion to adapt to the application occasions of the LED driving power supply
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of a power converter according to a first embodiment of the invention;
fig. 2 is a circuit diagram of a power converter according to a second embodiment of the invention;
fig. 3 is a circuit diagram of a power converter according to a third embodiment of the invention;
fig. 4 is a circuit diagram of a power converter according to a fourth embodiment of the invention;
fig. 5 is a circuit diagram of a power converter according to a fifth embodiment of the invention;
fig. 6 is a circuit diagram of a power converter according to a sixth embodiment of the invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 is a circuit diagram of a power converter according to a first embodiment of the present invention, and as shown in fig. 1, the power converter includes a rectifying circuit 11, and the rectifying circuit 11 is configured to rectify an ac input voltage Vac to output a dc bus voltage Vbus. The power converter further includes a resonant circuit 12, which includes a switching circuit and a resonant inductor Lr, and forms an LLC resonant circuit by using a capacitive device in the boost circuit 13, so as to convert the dc bus voltage Vbus into an output voltage or an output current for supplying power to a load. The switching circuit in the resonant circuit 12 is configured to convert the current bus voltage Vbus into an inverter voltage, and then rectify the inverter voltage into an output voltage via the load rectification circuit to supply power to the load. In the embodiment of the present invention, the switching circuit includes a first power transistor S1 and a second power transistor S2 connected in series, wherein one end of the first power transistor S1 is connected to the positive output terminal of the rectifying circuit 11, one end of the second power transistor S2 is connected to the negative output terminal of the rectifying circuit, and the inverted voltage is output at the common node of the first power transistor S1 and the second power transistor S2. The load rectifying circuit receives the inverted voltage through the resonant inductor Lr, and in the present invention, the load rectifying circuit includes a transformer T, a diode D9 and a diode D10, and it can be understood that other circuit structures capable of realizing isolation rectification are within the protection scope of the present invention.
The power converter further includes a voltage boost circuit 13 connected between the rectifying circuit 11 and the resonant circuit 12 and driven by an inductor current flowing through the resonant inductor Lr for obtaining a high power factor, wherein the voltage boost circuit 13 includes a first voltage boost circuit and a second voltage boost circuit connected in parallel.
In general, the waveform of the dc bus voltage Vbus output from the rectifier circuit 11 has peaks and valleys, and additional charge is pumped to the dc bus voltage Vbus by using the booster circuit 13, so that the waveform thereof is smoother and the peaks and valleys are smaller. In the power converter circuit described above, since the load current can be converted to the primary winding via the transformer, the primary winding of the transformer is connected in series with the resonant inductor, and the voltage boost circuit 13 is driven by the inductor current flowing through the resonant inductor Lr, almost all of the load current is utilized by the voltage boost circuit 13 to provide additional charge. Therefore, the power converter circuit of the embodiment of the invention can realize good power factor, low total harmonic distortion and low ripple content in load current or voltage. Specifically, the boost circuit 13 transfers the grid energy to the energy storage capacitor by using the capacitor to charge and discharge in a time-sharing manner, so that the input average current is a sine wave and is in phase with the ac input voltage Vac to improve the power factor. In the present invention, two input terminals of the switching circuit are connected across an energy storage capacitor C5, and a filter capacitor C4 is connected across two output terminals of the rectifying circuit 11.
The power converter further includes a detection circuit Rs. Specifically, the output terminal of the switching circuit, i.e., the common node of the first power transistor S1 and the second power transistor S2, is coupled to the resonant inductor Lr, and the detection circuit Rs for obtaining the current detection signal representing the output current is connected in series with the resonant inductor Lr. The power converter further includes a control circuit (not shown in the figure) for generating control signals of the power transistors S1 and S2 in the switch circuit according to the error between the current detection signal and the reference value, so that the output voltage or the output current of the power converter can meet the power supply requirement of the load. In one embodiment, one end of the detection circuit Rs is directly connected to the output end of the switching circuit, and the other end is directly connected to the resonant inductor Lr; in another embodiment, one end of the detection circuit Rs is directly connected to the voltage boosting circuit 13, and the other end is connected to the resonant inductor Lr through the primary winding Lp of the transformer T. Those skilled in the art will appreciate that there are different circuit variations within the scope of the present invention. The circuit components shown in the embodiments may be placed in a different arrangement or order while still falling within the scope of the invention and providing the functionality described by the circuits as initially arranged or ordered in the described embodiments.
Preferably, the power converter further includes an input circuit 10, specifically, an input end of the input circuit 10 is connected to a power supply grid to receive an ac input voltage Vac, an output end of the input circuit 10 is electrically connected to a first input end and a second input end of the rectifying circuit 11, respectively, and the rectifying circuit 11 obtains electric energy in the power supply grid through the input circuit 10, and then rectifies the electric energy and outputs a dc bus voltage Vbus. In the embodiment of the present invention, the input circuit 10 is composed of a "pi" type low pass filter including two capacitors and an inductor. Typically, the input frequency bandwidth of the low pass filter will be lower than the switching frequency of the power converter, but higher than the mains voltage supply frequency. The output terminals of the low-pass filters are connected to two input terminals of the rectifier circuit 11.
In a preferred embodiment, as shown in fig. 1, the first terminal of the booster circuit 13 is connected to the positive output terminal of the rectifier circuit, i.e., to the common node of the cathode of the diode D1 and the cathode of the diode D2; the second end of the voltage boost circuit 13 is connected to the positive input end of the switch circuit, i.e. one end of the power transistor S1; the third terminal of the boost circuit 13 is coupled to the resonant inductor Lr.
Specifically, the booster circuit 13 includes a first booster circuit and a second booster circuit connected in parallel. The first boost circuit includes a first diode D5, a second diode D6 connected in series and in the same direction as the first diode D5, and a first capacitor C1 having one end connected to the common node of the first diode D5 and the second diode D6 and the other end coupled to the resonant inductor Lr. The first boost circuit further includes a third capacitor C3, one end of the third capacitor C3 is connected to the common node of the first diode D5 and the second diode D6, and the other end is connected to the ground reference. The second boost circuit includes a third diode D7, a fourth diode D8 connected in series and in the same direction as the third diode D7, and a second capacitor C2 having one end connected to the common node of the third diode D7 and the fourth diode D8 and the other end coupled to the resonant inductor Lr. Specifically, the anode of the first diode D5 is connected to the positive output terminal of the rectifier circuit 11, the cathode is connected to the anode of the second diode D6, and the cathode of the second diode D6 is connected to the positive input terminal of the switch circuit; the anode of the third diode D7 is connected to the positive output terminal of the rectifier circuit 11, the cathode is connected to the anode of the fourth diode D8, and the cathode of the fourth diode D8 is connected to the positive input terminal of the switch circuit. In the embodiment of the present invention, the common node of the first capacitor C1 and the second capacitor C2 is coupled to the resonant inductor Lr, and specifically, is connected to one end of the resonant inductor Lr through the primary winding Lp of the transformer T, and the other end of the resonant inductor Lr is connected to the detection circuit Rs, and then the detection circuit Rs is connected to the output end of the switch circuit.
In the boost circuit 13, the operation process of the first boost circuit is: the first capacitor C1 in the first boost circuit Is shared as a resonant capacitor in a resonant loop, in a first period of a switching cycle, the resonant inductor Lr, the switching circuit and the first capacitor C1 are jointly acted as an equivalent sine wave current source Is (connected between a common node of the first diode D5 and the second diode D6 and a reference ground, and the current flowing from the common node to the reference ground Is a positive direction), the current of the sine wave current source Is larger than zero, the third capacitor C3 discharges, and the voltage Vm at the common node of the first diode D5 and the second diode D6 Is reduced to a direct-current bus voltage Vbus; in the next second period, the first diode D5 Is turned on, the voltage Vm Is maintained at the dc bus voltage Vbus, the input current Iin of the voltage boost circuit 13 Is the current of the current source Is, and in this stage, the current of the current source Is positively correlated with the voltage Vm of the common node, that Is, the input current Iin Is positively correlated with the magnitude of the dc bus voltage Vbus; in an immediately third time period, the current of the current source Is reversed, the third capacitor C3 Is charged, and the voltage Vm at the common node rises to the voltage across the energy storage capacitor C5; in the immediately following fourth period, the second diode D6 is conducting and the voltage Vm at the common node is maintained at the voltage across the energy storage capacitor C5.
It can be seen that the AC input current decreases as the dc bus voltage Vbus decreases, i.e., as the input voltage Vac voltage decreases, and conversely, the AC input current increases as the AC voltage peak, i.e., as the input voltage Vac voltage increases, so that the input current waveform follows the waveform of the input voltage, thereby improving the PF of the system.
In the present invention, the boost circuit 13 includes a first boost circuit and a second boost circuit connected in parallel, and when the input current Iin reaches the bottom of the valley, the third capacitor C3 cannot completely discharge the energy of the capacitor, so the input current Iin has a dead zone; the second booster circuit has no third capacitor C3, so the steady state is easy to enter, and the power factor correction effect after the two paths are superposed is the best.
Therefore, the power converter provided by the invention can realize good power factor and low total harmonic distortion by arranging the passive boost circuit between the rectifying circuit and the resonant circuit so as to adapt to the application occasions of the LED driving power supply.
Fig. 2 is a circuit diagram of a power converter according to a second embodiment of the present invention, and as shown in fig. 2, the power converter according to the embodiment of the present invention differs from the first embodiment only in that: in the boost circuit 23, the third capacitor C3 in the first boost circuit is connected in parallel to two ends of the first diode D5, and other circuit structures and operation principles are the same as those in the first embodiment, and are not described herein again.
Fig. 3 is a circuit diagram of a power converter according to a third embodiment of the present invention, and as shown in fig. 3, the power converter according to the embodiment of the present invention differs from the first embodiment only in that: in the voltage boost circuit 33, the third capacitor C3 in the first voltage boost circuit is connected in parallel to two ends of the second diode D6, and other circuit structures and operation principles are the same as those in the first embodiment, and are not described herein again.
In the above three embodiments, the first terminal of the voltage boosting circuit is connected to the positive output terminal of the rectifier circuit 11, i.e., to the common node of the cathode of the diode D1 and the cathode of the diode D2; the second end is connected with the positive input end of the switch circuit, namely one end of the power transistor S1; the third terminal is coupled with the resonant inductor Lr, wherein the negative input terminal of the switching circuit is connected to the reference ground. However, in the subsequent embodiments, the first terminal of the voltage boost circuit is connected to the negative output terminal of the rectifier circuit 11, i.e., to the common node of the anode of the diode D3 and the anode of the diode D4; the second end is connected with the negative input end of the switch circuit, namely one end of the power transistor S2; the third terminal is coupled with the resonant inductor Lr, and similarly, the negative input terminal of the switching circuit is connected to the reference ground. Meanwhile, adaptively, the cathode of the first diode D5 is connected to the negative output terminal of the rectifying circuit 11, the anode is connected to the cathode of the second diode D6, and the anode of the second diode D6 is connected to the negative input terminal of the switching circuit; the cathode of the third diode D7 is connected to the negative output terminal of the rectifier circuit 11, the anode is connected to the cathode of the fourth diode D8, and the anode of the fourth diode D8 is connected to the negative input terminal of the switch circuit.
Fig. 4 is a circuit diagram of a power converter according to a fourth embodiment of the present invention, and as shown in fig. 4, the power converter according to the embodiment of the present invention differs from the first embodiment only in that: a first end of the booster circuit 43 is connected to the negative output end of the rectifier circuit 11; the second end of the first switch is connected with the negative input end of the switch circuit; the third terminal is coupled to the resonant inductor Lr, and other circuit structures and operating principles are the same as those in the first embodiment, and are not described herein again.
Specifically, the voltage boosting circuit 43 includes a first voltage boosting circuit and a second voltage boosting circuit connected in parallel. The first boost circuit includes a first diode D5, a second diode D6 connected in series and in the same direction as the first diode D5, and a first capacitor C1 having one end connected to the common node of the first diode D5 and the second diode D6 and the other end coupled to the resonant inductor Lr. The first boost circuit further includes a third capacitor C3, one end of the third capacitor C3 is connected to the common node of the first diode D5 and the second diode D6, and the other end is connected to the positive output terminal of the rectifier circuit 11. The second boost circuit includes a third diode D7, a fourth diode D8 connected in series and in the same direction as the third diode D7, and a second capacitor C2 having one end connected to the common node of the third diode D7 and the fourth diode D8 and the other end coupled to the resonant inductor Lr. In the embodiment of the present invention, the common node of the first capacitor C1 and the second capacitor C2 is coupled to the resonant inductor Lr, and specifically, is connected to one end of the resonant inductor Lr through the primary winding Lp of the transformer T, and the other end of the resonant inductor Lr is connected to the detection circuit Rs, and then the detection circuit Rs is connected to the output terminal of the switch circuit. Specifically, the cathode of the first diode D5 is connected to the negative output terminal of the rectifier circuit 11, the anode is connected to the cathode of the second diode D6, and the anode of the second diode D6 is connected to the negative input terminal of the switch circuit; the cathode of the third diode D7 is connected to the negative output terminal of the rectifier circuit 11, the anode is connected to the cathode of the fourth diode D8, and the anode of the fourth diode D8 is connected to the negative input terminal of the switch circuit.
Fig. 5 is a circuit diagram of a power converter according to a fifth embodiment of the present invention, and as shown in fig. 5, the power converter according to the embodiment of the present invention differs from the fourth embodiment only in that: in the voltage boost circuit 53, the third capacitor C3 in the first voltage boost circuit is connected in parallel to two ends of the first diode D5, and other circuit structures and operation principles are the same as those in the first embodiment, and are not described herein again.
Fig. 6 is a circuit diagram of a power converter according to a sixth embodiment of the present invention, and as shown in fig. 6, the power converter according to the embodiment of the present invention differs from the fourth embodiment only in that: in the voltage boost circuit 63, the third capacitor C3 in the first voltage boost circuit is connected in parallel to two ends of the second diode D6, and other circuit structures and operating principles are the same as those in the first embodiment, and are not described herein again.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A power converter, comprising:
a rectifying circuit for rectifying an ac input voltage to output a dc bus voltage;
the resonant circuit comprises a switching circuit and a resonant inductor and is used for converting the direct current bus voltage into output voltage or output current so as to supply power to a load;
and the booster circuit is connected between the rectifying circuit and the resonant circuit and is driven by the inductive current flowing through the resonant inductor so as to obtain higher power factor, wherein the booster circuit comprises a first booster circuit and a second booster circuit which are connected in parallel.
2. The power converter according to claim 1, wherein the first terminal of the boost circuit is connected to the output terminal of the rectifying circuit, the second terminal is connected to the input terminal of the switching circuit, and the third terminal is coupled to the resonant inductor through a primary winding of a transformer.
3. The power converter of claim 1, wherein the first boost circuit comprises a first diode, a second diode connected in series and co-directional with the first diode, and a first capacitor having one end connected to a common node of the first diode and the second diode and the other end coupled to the resonant inductor.
4. The power converter according to claim 3, wherein the first boost circuit further comprises a third capacitor having one end connected to a common node of the first diode and the second diode and the other end connected to a ground reference or a positive output terminal of the rectification circuit.
5. The power converter of claim 3, wherein the first boost circuit further comprises a third capacitor connected in parallel across the first diode.
6. The power converter according to claim 3, wherein the first boost circuit further comprises a third capacitor connected in parallel to both ends of the second diode.
7. The power converter according to claim 3, wherein the second boost circuit comprises a third diode, a fourth diode connected in series and in the same direction as the third diode, and a second capacitor having one end connected to a common node of the third diode and the fourth diode and the other end coupled to the resonant inductor.
8. The power converter according to claim 1, wherein an energy storage capacitor is connected across two input terminals of the switching circuit.
9. The power converter according to claim 7, wherein the first terminal of the boost circuit is connected to the positive output terminal of the rectifying circuit, the second terminal is connected to the positive input terminal of the switching circuit, and the third terminal is coupled to the resonant inductor, wherein the negative input terminal of the switching circuit is connected to the ground reference.
10. The power converter according to claim 9, wherein an anode of the first diode is connected to the positive output terminal of the rectifying circuit, a cathode of the first diode is connected to an anode of the second diode, and a cathode of the second diode is connected to the positive input terminal of the switching circuit; the anode of the third diode is connected to the positive output end of the rectifying circuit, the cathode of the third diode is connected to the anode of the fourth diode, and the cathode of the fourth diode is connected to the positive input end of the switching circuit.
11. The power converter of claim 7, wherein the first terminal of the boost circuit is connected to the negative output terminal of the rectifier circuit, the second terminal is connected to the negative input terminal of the switch circuit, and the third terminal is coupled to the resonant inductor, wherein the negative input terminal of the switch circuit is connected to ground.
12. The power converter according to claim 11, wherein the cathode of the first diode is connected to the negative output terminal of the rectifying circuit, the anode is connected to the cathode of the second diode, and the anode of the second diode is connected to the negative input terminal of the switching circuit; the cathode of the third diode is connected to the negative output end of the rectifying circuit, the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected to the negative input end of the switching circuit.
13. The power converter of claim 1, wherein an output of the switching circuit is coupled to the resonant inductor, and a detection circuit for obtaining a current detection signal indicative of the output current is connected in series with the resonant inductor.
14. The power converter of claim 13, further comprising a control circuit configured to generate a control signal for a power transistor in the switching circuit according to an error between the current detection signal and a reference value, so that the output voltage or the output current meets a power supply requirement of a load.
15. The power converter according to claim 1, wherein a filter capacitor is connected across two output terminals of the rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110080657.3A CN112689363B (en) | 2021-01-21 | 2021-01-21 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110080657.3A CN112689363B (en) | 2021-01-21 | 2021-01-21 | Power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112689363A true CN112689363A (en) | 2021-04-20 |
| CN112689363B CN112689363B (en) | 2024-04-16 |
Family
ID=75458750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110080657.3A Active CN112689363B (en) | 2021-01-21 | 2021-01-21 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112689363B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114024454A (en) * | 2021-10-15 | 2022-02-08 | 矽力杰半导体技术(杭州)有限公司 | Power converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5119283A (en) * | 1991-06-10 | 1992-06-02 | General Electric Company | High power factor, voltage-doubler rectifier |
| US5559688A (en) * | 1993-05-19 | 1996-09-24 | 1,005,539 Ontario Inc. | Resonant power factor converter |
| CN2308229Y (en) * | 1997-08-09 | 1999-02-17 | 刘方栋 | High-power electronic ballast |
| CN204013236U (en) * | 2014-05-29 | 2014-12-10 | 深圳欧陆通电子有限公司 | A kind of DC power supply circuit |
| CN204652716U (en) * | 2015-02-15 | 2015-09-16 | 深圳市天绿地节能环保科技有限公司 | A kind of powerful two-stage LED drive power |
| CN109661072A (en) * | 2019-01-21 | 2019-04-19 | 杭州士兰微电子股份有限公司 | LLC resonant converter, LED drive circuit and its control method |
-
2021
- 2021-01-21 CN CN202110080657.3A patent/CN112689363B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5119283A (en) * | 1991-06-10 | 1992-06-02 | General Electric Company | High power factor, voltage-doubler rectifier |
| US5559688A (en) * | 1993-05-19 | 1996-09-24 | 1,005,539 Ontario Inc. | Resonant power factor converter |
| CN2308229Y (en) * | 1997-08-09 | 1999-02-17 | 刘方栋 | High-power electronic ballast |
| CN204013236U (en) * | 2014-05-29 | 2014-12-10 | 深圳欧陆通电子有限公司 | A kind of DC power supply circuit |
| CN204652716U (en) * | 2015-02-15 | 2015-09-16 | 深圳市天绿地节能环保科技有限公司 | A kind of powerful two-stage LED drive power |
| CN109661072A (en) * | 2019-01-21 | 2019-04-19 | 杭州士兰微电子股份有限公司 | LLC resonant converter, LED drive circuit and its control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114024454A (en) * | 2021-10-15 | 2022-02-08 | 矽力杰半导体技术(杭州)有限公司 | Power converter |
| EP4167453A1 (en) * | 2021-10-15 | 2023-04-19 | Silergy Semiconductor Technology (Hangzhou) Ltd | Power converter |
| CN114024454B (en) * | 2021-10-15 | 2023-11-14 | 矽力杰半导体技术(杭州)有限公司 | power converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112689363B (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Poorali et al. | Analysis of the integrated SEPIC-flyback converter as a single-stage single-switch power-factor-correction LED driver | |
| Athab et al. | A single-switch AC/DC flyback converter using a CCM/DCM quasi-active power factor correction front-end | |
| US6909622B2 (en) | Quasi active power factor correction circuit for switching power supply | |
| US20110122662A1 (en) | Buck and buck/boost converter systems having auxiliary circuits and method thereof | |
| CN101588139A (en) | High power factor isolated buck-type power factor correction converter | |
| Vilela et al. | An electronic ballast with high power factor and low voltage stress | |
| US20120086350A1 (en) | Full-bridge electronic ballast having simplified continuous-conduction-mode charge pump pfc circuit | |
| EP2385750B1 (en) | Power supply device having current control circuit capable of correcting power factor | |
| Lin et al. | A high efficiency integrated step-down Cuk and flyback converter for LED power driver | |
| CN112689363B (en) | Power converter | |
| CN112738953B (en) | Power converter | |
| CN103312142A (en) | AC power supply device | |
| CN201750602U (en) | Drive power source of LED daylight lamp | |
| CN109194165B (en) | AC-DC power converter | |
| TW202133535A (en) | Bridgeless step-up and step-down ac-to-dc converter | |
| CN105375807A (en) | Direct current (DC)/alternating current (AC) conversion device, direct current/ direct current conversion device and constant current driving device | |
| CN111740622B (en) | LLC circuit of single-stage PFC | |
| CN112689364B (en) | power converter | |
| CN205123617U (en) | DCAC conversion equipment , DCDC conversion equipment and constant current drive device | |
| Cheng et al. | A Novel Single-Stage High-Power-Factor AC-DC LED Power Supply for Streetlight Applications | |
| CN211183825U (en) | High-power-factor AC/DC converter of symmetrical charge pump | |
| EP3965276B1 (en) | Filter circuit with harmonic compensation | |
| CN214281232U (en) | Power supply control device of flash lamp and power supply device of flash lamp | |
| CN219204734U (en) | LED driving circuit and LED lighting device | |
| TWI448204B (en) | Full-bridge electronic ballast having dual continuous-current-mode charge pump pfc circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |