CN112689363B - Power converter - Google Patents
Power converter Download PDFInfo
- Publication number
- CN112689363B CN112689363B CN202110080657.3A CN202110080657A CN112689363B CN 112689363 B CN112689363 B CN 112689363B CN 202110080657 A CN202110080657 A CN 202110080657A CN 112689363 B CN112689363 B CN 112689363B
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- power converter
- output
- terminal
- 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.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 47
- 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 5
- 238000010586 diagram Methods 0.000 description 12
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Abstract
The application discloses a power converter, through setting up passive boost circuit between rectifier circuit and resonance circuit, can make power converter realize good power factor, low total harmonic distortion in order to adapt to LED drive power supply's application.
Description
Technical Field
The invention relates to the power electronic technology, in particular to a power converter.
Background
In recent years, the requirements of users on an LED driving power supply are higher and higher, for example, low harmonic wave, high PF value, no stroboscopic effect, small volume, high efficiency and low cost, because the conventional bridge rectification and capacitive filter circuit adopted by the conventional LED driving power supply can generate serious waveform distortion for the AC input current, a large amount of higher harmonic waves are injected into a power grid, so that the power factor of the power grid side is not high, and the serious harmonic wave pollution and interference are caused by the large amount of higher harmonic waves to the power grid and other electrical equipment, so that other electrical equipment cannot work normally, and in order to reduce the harmonic interference, a power factor correction circuit (PFC) is added in the LED driving power supply to improve the power factor in the LED driving power supply so as to reduce the harmonic interference.
Various passive switching Power Factor Correction (PFC) circuits exist that generally enable products to meet regulatory regulations at lower cost by having a high ripple content in the output current of the load. 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 a high quality light output with high efficiency and long lifetime and no flicker.
Disclosure of Invention
In view of the above, the present invention provides a power converter to solve the problem that the existing passive switching Power Factor Correction (PFC) circuit cannot be applied to the 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 to supply power to a load;
and the boost circuit is connected between the rectifying circuit and the resonant circuit and driven by the inductance current flowing through the resonant inductor, so as to obtain a higher power factor, wherein the boost circuit comprises a first boost circuit and a second boost circuit which are connected in parallel.
Preferably, the first end of the boost circuit is connected with the output end of the rectifying circuit, the second end of the boost circuit is connected with the input end of the switching circuit, and the third end of the boost circuit is coupled with the resonant inductor through a primary winding of a transformer.
Preferably, the first boost circuit includes a first diode, a second diode which is in the same direction as the first diode and is connected in series, and a first capacitor of which one end is connected to a common node of the first diode and the second diode and the other end is coupled to the resonant inductor.
Preferably, the first boost circuit further includes 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 includes 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 which is in the same direction as the third diode and is connected in series, 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 between the two input ends of the switching circuit in a bridging way.
Preferably, the first end of the boost circuit is connected with the positive output end of the rectifying circuit, the second end of the boost circuit is connected with the positive input end of the switching circuit, the third end of the boost circuit is coupled with the resonant inductor, and the negative input end of the switching circuit is connected to the reference ground.
Preferably, the anode of the first diode is connected to the positive output end of the rectifying circuit, the cathode is connected with 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 with 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, the first end of the boost circuit is connected with the negative output end of the rectifying circuit, the second end of the boost circuit is connected with the negative input end of the switching circuit, and the third end of the boost circuit is coupled with the resonant inductor, wherein the negative input end of the switching circuit is connected to the reference ground.
Preferably, the cathode of the first diode is connected to the negative output end of the rectifying circuit, the anode 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 of the switching circuit is coupled to the resonant inductor, and a detection circuit for obtaining a current detection signal representative of the output current is connected in series with the resonant inductor.
Preferably, the control circuit is further configured 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 the two output terminals of the rectifying circuit.
The invention can lead the power converter to realize good power factor and low total harmonic distortion by arranging the passive boost circuit between the rectifying circuit and the resonance circuit so as to be suitable for the application occasion 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 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 present invention;
FIG. 2 is a circuit diagram of a power converter according to a second embodiment of the present invention;
FIG. 3 is a circuit diagram of a power converter according to a third embodiment of the present 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 is 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 in detail. The present invention will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the invention.
Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.
Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or being "connected between" two nodes, it can 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 to" or "directly connected to" another element, it means that there are no intervening elements present between the two.
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, it is the meaning of "including but not limited to".
In the description of the present invention, it should 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. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Fig. 1 is a circuit diagram of a power converter according to a first embodiment of the present invention, 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 comprises a resonant circuit 12 comprising a switching circuit and a resonant inductance Lr and constituting an LLC resonant circuit with capacitive devices in a boost circuit 13 for converting the dc bus voltage Vbus into an output voltage or output current for powering a load. The switching circuit in the resonant circuit 12 is configured to convert the current bus voltage Vbus to an inverter voltage, and then rectify the inverter voltage to an output voltage via a load rectifying circuit to supply power to a 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, and one end of the second power transistor S2 is connected to the negative output terminal of the rectifying circuit, and the inverter voltage is output at a common node of the first power transistor S1 and the second power transistor S2. The load rectifying circuit receives the inverter 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 implementing isolated rectification are all within the protection scope of the present invention.
The power converter further comprises a boost circuit 13 connected between the rectifying circuit 11 and said resonant circuit 12 and driven by an inductor current flowing through the resonant inductor Lr for obtaining a higher power factor, wherein the boost circuit 13 comprises a first boost circuit and a second boost circuit connected to each other.
In general, the waveform of the dc bus voltage Vbus output by the rectifying circuit 11 has peaks and valleys, and additional charge is pumped to the dc bus voltage Vbus by using the boosting circuit 13 so that its waveform is smoother and the peaks and valleys are smaller. In the above power converter circuit, since the load current can be converted to the primary winding through the transformer, the primary winding of the transformer is connected in series with the resonant inductor, and the booster circuit 13 is driven by the inductor current flowing through the resonant inductor Lr, almost all the load current is utilized by the booster circuit 13 to provide the 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 uses capacitor time-sharing charging and discharging to transfer grid energy to the storage capacitor, so that the input average current is sinusoidal and in phase with the ac input voltage Vac to increase the power factor. In the present invention, a storage capacitor C5 is connected between two input terminals of the switching circuit, and a filter capacitor C4 is connected between two output terminals of the rectifying circuit 11.
The power converter further comprises a detection circuit Rs. Specifically, the output 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 inductance Lr, and a detection circuit Rs for obtaining a current detection signal representing the output current is connected in series to the resonant inductance Lr. The power converter further comprises a control circuit (not shown in the figure) for generating control signals of the power transistors S1 and S2 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 of the power converter meets 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 boost circuit 13, and the other end is connected to the resonant inductance 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 different arrangements or sequences, but still fall within the scope of the invention and provide the functionality described by the circuits initially arranged or ordered in the described embodiments.
Preferably, the power converter further includes an input circuit 10, specifically, an input terminal of the input circuit 10 is connected to a power supply grid to receive an ac input voltage Vac, output terminals of the input circuit 10 are electrically connected to a first input terminal and a second input terminal of a rectifying circuit 11, and the rectifying circuit 11 obtains electric energy in the power supply grid through the input circuit 10, and rectifies and outputs a dc bus voltage Vbus. In the embodiment of the invention, the input circuit 10 is composed of a "pi" type low-pass filter comprising two capacitors and one 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 of the low pass filter is connected to two inputs of the rectifying circuit 11.
In a preferred embodiment, as shown in fig. 1, the first terminal of the boost circuit 13 is connected to the positive output terminal of the rectifying circuit, i.e. to the common node of the cathode of diode D1 and the cathode of diode D2; a second end of the boost circuit 13 is connected with a positive input end of the switch circuit, namely 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 to each other. 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 a 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 a common node of the first diode D5 and the second diode D6, and the other end is connected to the ground. 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 a 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 rectifying 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 switching circuit; the anode of the third diode D7 is connected to the positive output of the rectifying 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 of the switching 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, specifically, the primary winding Lp of the transformer T is connected to one end of the resonant inductor Lr, 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 switching circuit.
In the booster circuit 13, the operation of the first booster circuit is: the first capacitor C1 in the first boost circuit Is shared as a resonant capacitor in the resonant tank, the resonant inductor Lr, the switch circuit and the first capacitor C1 act together to form an equivalent sine wave current source Is (connected between the common node of the first diode D5 and the second diode D6 and the reference ground, and the positive direction flows from the common node to the reference ground), the current Is greater than zero, and the third capacitor C3 discharges, so that the voltage Vm at the common node of the first diode D5 and the second diode D6 drops to the dc 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 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 the next third 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 next fourth period, the second diode D6 is turned on, and the voltage Vm at the common node is maintained at the voltage across the storage capacitor C5.
It can be seen that the lower the dc bus voltage Vbus, i.e., the smaller the input voltage Vac, the smaller the AC input current, whereas the peak AC voltage, i.e., the maximum input voltage Vac, the maximum AC input current, thus enabling the input current waveform to track the waveform of the input voltage and further enabling the PF of the system to be improved.
The foregoing is the working condition of the single-circuit booster circuit, in the present invention, the booster circuit 13 includes a first booster circuit and a second booster circuit that are connected to each other, and when the input current Iin reaches the valley, the input current Iin has a dead zone because the capacitance energy of the third capacitor C3 cannot be completely released; the second boost circuit has no third capacitor C3, so the second boost circuit is easier to enter a steady state, and the power factor correction effect after two paths of superposition is the best.
Therefore, the power converter can realize good power factor and low total harmonic distortion by arranging the passive boost circuit between the rectifying circuit and the resonance circuit so as to be suitable for the application occasion 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, as shown in fig. 2, and the power converter according to the embodiment of the present invention is different 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, which will not be described herein.
Fig. 3 is a circuit diagram of a power converter according to a third embodiment of the present invention, as shown in fig. 3, and the power converter according to the embodiment of the present invention is different from the first embodiment only in that: in the boost circuit 33, the third capacitor C3 in the first boost circuit is connected to two ends of the second diode D6 in parallel, and other circuit structures and operation principles are the same as those in the first embodiment, and will not be described herein.
In the above three embodiments, the first end of the boost circuit is connected to the positive output end of the rectifying 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 switching circuit, namely one end of the power transistor S1; the third terminal is coupled to the resonant inductor Lr, wherein the negative input terminal of the switching circuit is connected to ground. However, in the following several embodiments, the first terminal of the boost circuit is connected to the negative output terminal of the rectifying circuit 11, i.e. to the common node of the anode of diode D3 and the anode of diode D4; the second end is connected with the negative input end of the switching circuit, namely one end of the power transistor S2; the third terminal is coupled to the resonant inductor Lr and likewise the negative input terminal of the switching circuit is connected to 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 of the rectifying 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 of the switching circuit.
Fig. 4 is a circuit diagram of a power converter according to a fourth embodiment of the present invention, as shown in fig. 4, and the power converter according to the embodiment of the present invention is different from the first embodiment only in that: a first end of the booster circuit 43 is connected to the negative output terminal of the rectifier circuit 11; the second end of the switch circuit 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 operation principles are the same as those in the first embodiment, and will not be described herein.
Specifically, the booster circuit 43 includes a first booster circuit and a second booster circuit connected to each other. 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 a 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 a common node of the first diode D5 and the second diode D6, and the other end is connected to the positive output end of the rectifying 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 a 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, where, specifically, the primary winding Lp of the transformer T is connected to one end of the resonant inductor Lr, 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. Specifically, 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 of the rectifying 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 of the switching 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 is different from the fourth embodiment only in that: in the boost circuit 53, the third capacitor C3 in the first boost circuit is connected to two ends of the first diode D5 in parallel, and other circuit structures and operation principles are the same as those in the first embodiment, which will not be described herein.
Fig. 6 is a circuit diagram of a power converter according to a sixth embodiment of the invention, as shown in fig. 6, and the power converter according to the embodiment of the invention is different from the fourth embodiment only in that: in the boost circuit 63, the third capacitor C3 in the first boost circuit is connected to two ends of the second diode D6 in parallel, and other circuit structures and operation principles are the same as those in the first embodiment, which will not be described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A power converter, comprising:
a rectifying circuit for rectifying an ac input voltage to output a dc bus voltage;
the filter circuit is connected between the output ends of the rectification circuits in a bridging way;
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 to supply power to a load;
a boost circuit connected between the rectifying circuit and the resonant circuit and driven by an inductor current flowing through the resonant inductor to obtain a higher power factor, wherein the boost circuit comprises a first boost circuit and a second boost circuit which are connected with each other; the first boost circuit and the second boost circuit are coupled with the resonant inductor to form an LLC resonant circuit by using a capacitive device in the boost circuit, wherein an energy storage capacitor is connected between two input ends of the switch circuit in a bridging way; the boosting circuit uses the energy storage capacitor to charge and discharge in a time-sharing way, and transfers the energy of a power grid to the energy storage capacitor, so that the input average current is sine wave and is in phase with the alternating current input voltage.
2. The power converter of claim 1, wherein the boost circuit has a first terminal connected to the output of the rectifying circuit, a second terminal connected to the input of the switching circuit, and a third terminal 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 co-directional and series-connected 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 of 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 reference ground or a positive output terminal of the rectifying 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 of claim 3, wherein the first boost circuit further comprises a third capacitor connected in parallel across the second diode.
7. The power converter of claim 3, wherein the second boost circuit comprises a third diode, a fourth diode co-directional and series-connected with 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 of claim 7, wherein the boost circuit has a first terminal connected to a positive output terminal of the rectifying circuit, a second terminal connected to a positive input terminal of the switching circuit, and a third terminal coupled to the resonant inductor, wherein a negative input terminal of the switching circuit is connected to ground.
9. The power converter of claim 8, wherein an anode of the first diode is connected to a positive output of the rectifying circuit, a cathode is connected to an anode of the second diode, and a cathode of the second diode is connected to a positive input 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 with the anode of the fourth diode, and the cathode of the fourth diode is connected to the positive input end of the switching circuit.
10. The power converter of claim 7, wherein the boost circuit has a first terminal connected to the negative output of the rectifying circuit, a second terminal connected to the negative input of the switching circuit, and a third terminal coupled to the resonant inductor, wherein the negative input of the switching circuit is connected to ground.
11. The power converter of claim 10, wherein a cathode of the first diode is connected to a negative output of the rectifying circuit, an anode is connected to a cathode of the second diode, and an anode of the second diode is connected to a negative input 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.
12. 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 representative of the output current is connected in series with the resonant inductor.
13. The power converter of claim 12, further comprising a control circuit configured to generate a control signal for a power transistor in the switching circuit based on the error between the current detection signal and a reference value such that the output voltage or the output current meets a power supply requirement of a load.
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 CN112689363A (en) | 2021-04-20 |
| CN112689363B true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114024454B (en) * | 2021-10-15 | 2023-11-14 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112689363A (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8736238B2 (en) | Buck and buck/boost converter systems having auxiliary circuits and method thereof | |
| US6281636B1 (en) | Neutral-point inverter | |
| US6909622B2 (en) | Quasi active power factor correction circuit for switching power supply | |
| US9013111B2 (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 | |
| CN112689363B (en) | Power converter | |
| CN112738953B (en) | Power converter | |
| US6998795B2 (en) | Power factor correction circuit for electronic ballast | |
| CN109194165B (en) | AC-DC power converter | |
| CN112689364B (en) | power converter | |
| CN214337811U (en) | Alternating current-direct current conversion circuit | |
| CN111740622B (en) | LLC circuit of single-stage PFC | |
| CN109256966B (en) | AC-DC power converter | |
| Dos Santos et al. | A charge-pump led driver with PFC and low-frequency-flicker reduction | |
| CN211183825U (en) | High-power-factor AC/DC converter of symmetrical charge pump | |
| CN114024454B (en) | power converter | |
| CN215379289U (en) | Absorption module, dimming circuit and light-emitting device | |
| CN110891347B (en) | Linear LED driving system, linear booster circuit and method | |
| TWI448204B (en) | Full-bridge electronic ballast having dual continuous-current-mode charge pump pfc circuit | |
| TWI448203B (en) | Full-bridge electronic ballast with continuous-current-mode charge pump pfc circuit having resonant tank | |
| EP3965276B1 (en) | Filter circuit with harmonic compensation | |
| TWI437925B (en) | Full-bridge electronic ballast having continuous-current-mode charge pump pfc circuit with inductor connected to ac terminal | |
| Lv | An LCC-type Bridgeless Continuous Input Current Charge Pump PFC Converter | |
| CN111082678A (en) | High-power-factor AC/DC converter of symmetrical charge pump | |
| RU95947U1 (en) | ELECTRONIC START-UP CONTROL UNIT FOR DISCHARGE LAMP |
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 |