CN112738953B - Power converter - Google Patents
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- CN112738953B CN112738953B CN202110081005.1A CN202110081005A CN112738953B CN 112738953 B CN112738953 B CN 112738953B CN 202110081005 A CN202110081005 A CN 202110081005A CN 112738953 B CN112738953 B CN 112738953B
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- 239000003990 capacitor Substances 0.000 claims description 75
- 238000001514 detection method Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000004804 winding Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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, and the output ripple is less 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 adapt to the application of the LED driving power.
According to a first aspect of 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; the boost circuit is connected between the rectifying circuit and the resonant circuit, and comprises a first capacitor, a second capacitor and a first diode, wherein one end of the first capacitor is connected with the output end of the rectifying circuit, the other end of the first capacitor is coupled with the first end of the resonant inductor, one end of the second capacitor is connected with the input end of the rectifying circuit, the other end of the second capacitor is coupled with the first end of the resonant inductor, and the first diode is arranged between the rectifying circuit and the switching circuit.
Preferably, in the boost circuit, one of two diodes connected to one output terminal of the rectifying circuit in the rectifying circuit is time-division multiplexed, and forms a first boost circuit together with the first capacitor, the first diode and the third capacitor.
Preferably, in the boost circuit, the second boost circuit is formed by multiplexing two diodes connected to the negative input end of the rectifying circuit and the second capacitor.
Preferably, the boost circuit is driven by an inductor current flowing through the resonant inductor to achieve a higher power factor.
Preferably, one end of the second capacitor in the boost circuit is connected with the negative input end of the rectifying circuit, and the other end is coupled with the first end of the resonant inductor.
Preferably, one end of the first capacitor in the boost circuit is connected with the negative output end of the rectifying circuit, and the other end is coupled with the first end of the resonant inductor.
Preferably, the boost circuit further includes a third capacitor connected in parallel to both ends of the first diode.
Preferably, the boost circuit further comprises a third capacitor connected between the two output terminals of the rectifying circuit.
Preferably, the boost circuit further includes a third capacitor, one end of the third capacitor is connected to the negative input end of the rectifying circuit, and the other end of the third capacitor is connected to a common node of the first diode and the input end of the switching circuit.
Preferably, a cathode of the first diode is connected to a common node of the first capacitor and the negative output terminal of the rectifying circuit, and an anode is connected to the negative input terminal of the switching circuit.
Preferably, one end of the first capacitor in the boost circuit is connected with the positive output end of the rectifying circuit, and the other end is coupled with the first end of the resonant inductor.
Preferably, an anode of the first diode is connected to a common node of the first capacitor and the positive output terminal of the rectifying circuit, and an anode of the first diode is connected to the positive input terminal of the switching circuit.
Preferably, an energy storage capacitor is connected between the two input ends of the switching circuit in a bridging way.
Preferably, an output terminal of the switching circuit is coupled to a second terminal of 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 current detection signal, so that the output voltage or the output current meets a power supply requirement of a load.
According to the power converter, the passive boost circuit is arranged between the rectifying circuit and the resonance circuit, so that the power converter can achieve good power factor and low total harmonic distortion, and the output ripple is small 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 high power factor.
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, the two inputs of the switching circuit are connected across a storage capacitor C4.
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), and the control circuit is configured to generate control signals of the power transistors S1 and S2 in the switching circuit according to the current detection signal, so that an output voltage or an output current of the power converter meets a 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 second end of 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 first end of 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 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, an output terminal of the input circuit 10 is electrically connected to a first input terminal, i.e. a positive input terminal, a second input terminal, i.e. a negative input terminal, of the 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 boost circuit 13 includes a first capacitor C1 having one end connected to the output terminal of the rectifying circuit 11 and the other end coupled to the first end of the resonant inductor Lr, a second capacitor C2 having one end connected to the input terminal of the rectifying circuit 11 and the other end coupled to the first end of the resonant inductor Lr, and a first diode D5 disposed between the rectifying circuit 11 and the switching circuit. Specifically, in the embodiment of the present invention, one end of the second capacitor C2 is connected to the negative input end of the rectifying circuit 11, and the other end is coupled to the first end of the resonant inductor Lr; one end of the first capacitor C1 is connected with the negative output end of the rectifying circuit, and the other end of the first capacitor C1 is coupled with the first end of the resonant inductor Lr; the cathode of the first diode D5 is connected to the common node of the first capacitor C1 and the negative output of the rectifying circuit 11, and the anode is connected to the negative input of the switching circuit. The boost circuit further comprises a third capacitor C3, and in the embodiment of the present invention, the third capacitor C3 is connected in parallel to both ends of the first diode D5. In other embodiments, the third capacitor C3 may be disposed at other locations. 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.
The booster circuit 13 may actually form a two-way booster circuit with the diode in the rectifier circuit 11, and the first-way booster circuit may be formed by the first capacitor C1, the first diode D5, the third capacitor C3, and the diode D3 or D4. When the alternating current input voltage Vac is in the positive half cycle, the diode D4 is conducted, so that the diode D4 participates in the operation of the first-path booster circuit at the moment; when the ac input voltage Vac is in the negative half cycle, the diode D3 is turned on, so that the diode D3 participates in the operation of the first-path booster circuit. The second boost circuit is formed by the second capacitor C2, the diodes D2, D4, and the small parasitic capacitance between the common connection point of the diodes D2 and D4 and the reference ground.
In the booster circuit 13, the working process of the first booster circuit is as follows: in a first period of one switching cycle, the resonant inductor Lr, the switching circuit and the first capacitor C1 are combined to act as an equivalent sine wave current source Is (connected between the common node of the diode D4 and the first diode D5 and the second capacitor C3, and the direction of the current flowing from the common node to the ground Is positive), the current Is greater than zero, and the third capacitor C3 Is charged so that the voltage Vm at the common node of the diode D4 and the first diode D5 rises to the difference Vbus-Vac between the dc bus voltage and the input voltage; in a second period immediately after that, the diode D4 Is turned on, the voltage Vm Is maintained at the difference Vbus-Vac between the dc bus voltage and the input voltage, the input current Iin 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 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 discharged, and the voltage Vm at the common node drops by-Vd (Vd Is the voltage drop of one diode D5) from the difference Vbus-Vac of the dc bus voltage and the input voltage; in the next fourth period, the first diode D5 is turned on, and the voltage Vm at the common node is maintained at-Vd.
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-path booster circuit, in the present invention, the booster circuit 13 includes a first path booster circuit and a second path booster circuit connected in parallel, and when the input current Iin reaches the valley, the first path booster circuit cannot completely release the capacitance energy of the third capacitor C3, so that there is a dead zone for the input current Iin; the second booster circuit has no third capacitor C3, so the second booster circuit is easier to enter a steady state, and the power factor correction effect after the two booster circuits are overlapped 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, and has smaller output ripple 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 is connected between two output ends of the rectifying circuit 11, and other circuit structures and operation principles are the same as those of the first embodiment, and will not be described herein again.
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, one end of the third capacitor C3 is connected to the negative input end of the rectifying circuit 11, and the other end is connected to a common node between the anode of the first diode D5 and the negative input end of the switching circuit, and other circuit structures and operating principles are the same as those in the first embodiment, which will not be described herein.
In the above three embodiments, one end of the first capacitor C1 in the boost circuit is connected to the negative output terminal of the rectifying circuit, and the other end is connected to one end of the resonant inductor Lr through the primary winding Lp of the transformer T, so that the first diode D5 needs to be set with its cathode connected to the common node of the first capacitor C1 and the negative output terminal of the rectifying circuit 11, and its anode connected to the negative input terminal of the switching circuit. However, in several embodiments below, the position of the second capacitor C2 in the boost circuit is unchanged, one end of the first capacitor C1 in the boost circuit is connected to the positive output terminal of the rectifying circuit, and the other end is connected to one end of the resonant inductor Lr through the primary winding Lp of the transformer T, so that the first diode D5 needs to be arranged with its anode connected to the common node of the first capacitor C1 and the positive output terminal of the rectifying circuit 11, and its cathode connected to the positive input terminal of the switching circuit, i.e. one end of the first power transistor S1, wherein one end of the second power transistor S2 is connected to the ground, i.e. the negative input terminal 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: in the boost circuit 43, one end of the first capacitor C1 is connected to the positive output terminal of the rectifying circuit, and the other end is connected to one end of the resonant inductor Lr through the primary winding Lp of the transformer T, so that the first diode D5 needs to be set such that its anode is connected to the common node of the first capacitor C1 and the positive output terminal of the rectifying circuit 11, and the cathode is connected to the positive input terminal of the switching circuit. The other circuit structures and the working principles are the same as those in the first embodiment, and will not be described here again.
The boost circuit 43 may actually form a two-way boost circuit with the diode in the rectifier circuit 11, and the first-way boost circuit may be formed by the first capacitor C1, the first diode D5, the third capacitor C3, and the diode D1 or D2. When the alternating current input voltage Vac is in the positive half cycle, the diode D1 is conducted, so that the diode D1 participates in the operation of the first-path booster circuit at the moment; when the ac input voltage Vac is in the negative half cycle, the diode D2 is turned on, so that the diode D2 participates in the operation of the first-path booster circuit. The second boost circuit is formed by the second capacitor C2, the diodes D2, D4, and the small parasitic capacitance between the common connection point of the diodes D2 and D4 and the reference ground.
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 is connected between two output ends of the rectifying circuit 11, and other circuit structures and operation principles are the same as those of the first embodiment, and will not be described herein again.
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, one end of the third capacitor C3 is connected to the negative input end of the rectifying circuit 11, and the other end is connected to a common node between the cathode of the first diode D5 and the positive input end of the switching circuit, and other circuit structures and operating 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 (14)
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 to supply power to a load; the boost circuit is connected between the rectifying circuit and the resonant circuit, and comprises a first capacitor, a second capacitor and a first diode, wherein one end of the first capacitor is connected with the output end of the rectifying circuit, the other end of the first capacitor is coupled with the first end of the resonant inductor, one end of the second capacitor is connected with the negative input end of the rectifying circuit, the other end of the second capacitor is coupled with the first end of the resonant inductor, and the first diode is arranged between the rectifying circuit and the switching circuit.
2. The power converter according to claim 1, wherein the boost circuit is configured by time-multiplexing one of two diodes connected to one output terminal of the rectifying circuit in the rectifying circuit, and the first boost circuit is configured with the first capacitor, the first diode, and the third capacitor.
3. The power converter according to claim 1, wherein the boost circuit is configured by multiplexing two diodes of the rectifying circuit connected to the negative input terminal of the rectifying circuit, and forming a second boost circuit together with the second capacitor.
4. The power converter of claim 1, wherein the boost circuit is driven by an inductor current flowing through the resonant inductor for a higher power factor.
5. The power converter of claim 1, wherein one end of the first capacitor in the boost circuit is connected to the negative output terminal of the rectifying circuit, and the other end is coupled to the first end of the resonant inductor.
6. The power converter of claim 1, wherein the boost circuit further comprises a third capacitor connected in parallel across the first diode.
7. The power converter of claim 1, wherein the boost circuit further comprises a third capacitor connected between two outputs of the rectifying circuit.
8. The power converter of claim 1, wherein the boost circuit further comprises a third capacitor having one end connected to the negative input of the rectifying circuit and the other end connected to a common node of the first diode and the input of the switching circuit.
9. The power converter of claim 5, wherein a cathode of the first diode is connected to a common node of the first capacitor and a negative output of the rectifying circuit, and an anode is connected to a negative input of the switching circuit.
10. The power converter of claim 1, wherein one end of the first capacitor in the boost circuit is connected to a positive output terminal of the rectifying circuit, and the other end is coupled to a first end of the resonant inductor.
11. The power converter of claim 10, wherein an anode of the first diode is connected to a common node of the first capacitor and the positive output of the rectifying circuit, and an anode is connected to the positive input of the switching circuit.
12. The power converter of claim 1, wherein a storage capacitor is connected across the two input terminals of the switching circuit.
13. The power converter of claim 1, wherein an output of the switching circuit is coupled to a second end of 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.
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 based on the current sense signal such that the output voltage or output current meets a power supply requirement of a load.
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| CN202110081005.1A CN112738953B (en) | 2021-01-21 | 2021-01-21 | Power converter |
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| CN112738953B true CN112738953B (en) | 2024-02-23 |
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| CN115528897B (en) * | 2022-11-29 | 2023-03-03 | 深圳市恒运昌真空技术有限公司 | Resonant converter and control method thereof |
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| CN107994789A (en) * | 2017-11-24 | 2018-05-04 | 浙江大学 | A kind of isolated form integrated form AC-DC converter based on non-bridge PFC and LLC resonance |
| 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 |
| CN209930559U (en) * | 2019-01-21 | 2020-01-10 | 杭州士兰微电子股份有限公司 | LLC resonant converter and LED drive circuit |
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