CN112738953A - Power converter - Google Patents

Power converter Download PDF

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Publication number
CN112738953A
CN112738953A CN202110081005.1A CN202110081005A CN112738953A CN 112738953 A CN112738953 A CN 112738953A CN 202110081005 A CN202110081005 A CN 202110081005A CN 112738953 A CN112738953 A CN 112738953A
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circuit
capacitor
power converter
converter according
diode
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CN202110081005.1A
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CN112738953B (en
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王龙奇
王建新
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Hangzhou Silergy Semiconductor Technology Ltd
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Hangzhou Silergy Semiconductor Technology Ltd
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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
    • 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
    • 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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  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The application discloses power converter through set up passive boost circuit between rectifier circuit and resonant circuit, can be so that power converter realizes good power factor, low total harmonic distortion, and the output ripple is less in order to adapt to LED drive power supply's application scenario.

Description

Power converter
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, which is suitable for the application of the LED driving power.
According to a first aspect of embodiments 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; the boost circuit is connected between the rectifying circuit and the resonant circuit and comprises a first capacitor with one end connected with the output end of the rectifying circuit and the other end coupled with the first end of the resonant inductor, a second capacitor with one end connected with the input end of the rectifying circuit and the other end coupled with the first end of the resonant inductor, and a first diode arranged between the rectifying circuit and the switch circuit.
Preferably, in the boost circuit, one of two diodes connected to one output terminal of the rectifier circuit in the rectifier circuit is time-division multiplexed, and the first diode, the first capacitor, and the third capacitor together form a first path of boost circuit.
Preferably, in the boost circuit, a second path of boost circuit is formed by multiplexing two diodes connected with the negative input end of the rectification circuit in the rectification circuit and the second capacitor.
Preferably, the voltage boosting circuit is driven by an inductor current flowing through the resonant inductor to obtain a high power factor.
Preferably, one end of the second capacitor in the boost circuit is connected to the negative input end of the rectifier circuit, and the other end of the second capacitor is coupled to the first end of the resonant inductor.
Preferably, one end of the first capacitor in the boost circuit is connected to the negative output end of the rectifier circuit, and the other end of the first capacitor is coupled to the first end of the resonant inductor.
Preferably, the boost circuit further comprises a third capacitor connected in parallel to both ends of the first diode.
Preferably, the boost circuit further comprises a third capacitor connected between two output ends of the rectifying circuit.
Preferably, the boost circuit further comprises a third capacitor, one end of the third capacitor is connected with 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 switch circuit.
Preferably, the 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 the 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 to the positive output end of the rectifier circuit, and the other end of the first capacitor is coupled to 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 rectifier circuit, and an anode is connected to the positive input terminal of the switch circuit.
Preferably, an energy storage capacitor is connected across two input ends of the switching circuit.
Preferably, an output terminal of the switching circuit is coupled to the second terminal of 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 switch circuit according to the current detection signal, so that the output voltage or the output current meets the power supply requirement of the load.
According to the power converter, the passive booster circuit is arranged between the rectifying circuit and the resonant circuit, so that the power converter can achieve good power factor and low total harmonic distortion, and output ripples are small so as 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 boost circuit 13 connected between the rectifier 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.
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 a storage capacitor C4.
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 current detection signal, so that the output voltage or the output current of the power converter satisfies the power supply requirement of the load. In one embodiment, one end of the detection circuit Rs is directly connected to the output terminal of the switching circuit, and the other end is directly connected to the second terminal of 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 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 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, i.e., a positive input end, and a second input end, i.e., a negative input end, of the rectifier circuit 11, respectively, and the rectifier circuit 11 is configured to obtain electric energy in the power supply grid through the input circuit 10, and then rectify the electric energy and output 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 voltage boost circuit 13 includes a first capacitor C1 having one end connected to the output terminal of the rectifier circuit 11 and the other end coupled to the first terminal of the resonant inductor Lr, a second capacitor C2 having one end connected to the input terminal of the rectifier circuit 11 and the other end coupled to the first terminal of the resonant inductor Lr, and a first diode D5 disposed between the rectifier 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 terminal of the rectifier 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; a cathode of the first diode D5 is connected to a common node of the first capacitor C1 and the negative output terminal of the rectifying circuit 11, and an anode is connected to the negative input terminal of the switching circuit. The boost circuit further comprises a third capacitor C3, and in the embodiment of the invention, the third capacitor C3 is connected in parallel to two ends of the first diode D5. In other embodiments, the third capacitor C3 may be disposed at other positions. 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, which is then connected to the output terminal of the switch circuit.
The boost circuit 13 may actually form a two-way boost circuit with the diode in the rectifier circuit 11, and the first boost circuit is formed by the first capacitor C1, the first diode D5, the third capacitor C3, and the diode D3 or D4. When the ac input voltage Vac is at the positive half cycle, the diode D4 is turned on, so that the diode D4 participates in the operation of the first path of boost circuit; when the ac input voltage Vac is at the negative half cycle, the diode D3 is turned on, so the diode D3 participates in the operation of the first path of voltage boost circuit. The second boost circuit is composed of a second capacitor C2, diodes D2 and D4, and a smaller parasitic capacitance between the common connection point of the diode D2 and the diode D4 and the reference ground.
In the boost circuit 13, the working process of the first path of boost circuit is as follows: in the first period of one switching cycle, a sine wave current source Is (which Is connected between the common node of the diode D4 and the first diode D5 and the second capacitor C3, and the current flowing from the common node to the reference ground Is a positive direction) which Is equivalent to the combined action of the resonant inductor Lr, the switching circuit and the first capacitor C1, the current of the sine wave current source Is larger than zero, the third capacitor C3 Is charged, and the voltage Vm at the common node of the diode D4 and the first diode D5 Is enabled to rise to the difference Vbus-Vac between the direct current bus voltage and the input voltage; in the next second period, 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 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 discharged, and the voltage Vm at the common node Is dropped by-Vd from the difference Vbus-Vac between the dc bus voltage and the input voltage (Vd Is the voltage drop of one diode D5); in the immediately following 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 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 valley, the energy of the third capacitor C3 cannot be completely released, so the input current Iin has a dead zone; the second path of the booster circuit has no third capacitor C3, so the second path of the booster circuit is easier to enter a steady state, and the power factor correction effect after the two paths are superposed is the best.
Therefore, the passive boost circuit is arranged between the rectifying circuit and the resonant circuit, so that the power converter can achieve good power factor and low total harmonic distortion, and output ripples are small 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 is connected between the two output ends of the rectifying circuit 11, and other circuit structures and operating 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 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 the common node between the anode of the first diode D5 and the negative input end of the switch circuit.
In the above three embodiments, one end of the first capacitor C1 in the booster circuit is connected to the negative output terminal of the rectifier 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 cathode is connected to the common node of the first capacitor C1 and the negative output terminal of the rectifier circuit 11, and its anode is connected to the negative input terminal of the switch circuit. However, in the following embodiments, the position of the second capacitor C2 in the boost circuit is not changed, one end of the first capacitor C1 in the boost circuit is connected to the positive output terminal of the rectifier 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 configured such that its anode is connected to the common node of the first capacitor C1 and the positive output terminal of the rectifier circuit 11, and its cathode is connected to the positive input terminal of the switch circuit, that is, one end of the first power transistor S1, wherein one end of the second power transistor S2 is connected to the ground reference, that is, 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: in the booster circuit 43, one end of the first capacitor C1 is connected to the positive output terminal of the rectifier 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 rectifier circuit 11, and its cathode is connected to the positive input terminal of the switch circuit. Other circuit structures and operation principles are the same as those in the first embodiment, and are not described herein again.
In fact, the boost circuit 43 may also form a two-way boost circuit with the diode in the rectifier circuit 11, and the first boost circuit is formed by the first capacitor C1, the first diode D5, the third capacitor C3, and the diode D1 or D2. When the ac input voltage Vac is at the positive half cycle, the diode D1 is turned on, so that the diode D1 participates in the operation of the first path of boost circuit; when the ac input voltage Vac is at the negative half cycle, the diode D2 is turned on, so the diode D2 participates in the operation of the first path of voltage boost circuit. The second boost circuit is composed of a second capacitor C2, diodes D2 and D4, and a smaller parasitic capacitance between the common connection point of the diode D2 and the diode 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 differs from the fourth embodiment only in that: in the voltage boost circuit 53, the third capacitor C3 is connected between the two output ends of the rectifying circuit 11, and other circuit structures and operating 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, 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 the common node between the cathode of the first diode D5 and the positive input end of the switch circuit.
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;
the boost circuit is connected between the rectifying circuit and the resonant circuit and comprises a first capacitor with one end connected with the output end of the rectifying circuit and the other end coupled with the first end of the resonant inductor, a second capacitor with one end connected with the input end of the rectifying circuit and the other end coupled with the first end of the resonant inductor, and a first diode arranged between the rectifying circuit and the switch circuit.
2. The power converter according to claim 1, wherein the boost circuit is configured by time-division multiplexing one of two diodes connected to an output terminal of the rectifier circuit in the rectifier circuit, and the first diode, the first capacitor, and the third capacitor together form a first boost circuit.
3. The power converter according to claim 1, wherein the boost circuit is configured by multiplexing two diodes connected to the negative input terminal of the rectifier circuit in the rectifier circuit, and by combining the two diodes with the second capacitor.
4. The power converter according to claim 1, wherein the boost circuit is driven by an inductor current flowing through the resonant inductor for obtaining a higher power factor.
5. The power converter according to claim 1, wherein one end of the second capacitor in the boost circuit is connected to the negative input terminal of the rectifier circuit, and the other end is coupled to the first end of the resonant inductor.
6. The power converter according to claim 1, wherein one end of the first capacitor in the boost circuit is connected to the negative output terminal of the rectifier circuit, and the other end is coupled to the first end of the resonant inductor.
7. The power converter according to claim 1, wherein the boost circuit further comprises a third capacitor connected in parallel across the first diode.
8. The power converter according to claim 1, wherein the boost circuit further comprises a third capacitor connected between the two output terminals of the rectifying circuit.
9. The power converter according to claim 1, wherein the boost circuit further comprises a third capacitor having one end connected to the negative input terminal of the rectifying circuit and the other end connected to a common node of the first diode and the input terminal of the switching circuit.
10. The power converter according to claim 6, wherein the 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 the anode is connected to the negative input terminal of the switching circuit.
11. The power converter according to claim 1, wherein one end of the first capacitor in the boost circuit is connected to the positive output terminal of the rectifier circuit, and the other end is coupled to the first end of the resonant inductor.
12. The power converter according to claim 11, wherein 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 is connected to the positive input terminal of the switching circuit.
13. The power converter according to claim 1, wherein an energy storage capacitor is connected across two input terminals of the switching circuit.
14. The power converter of claim 1, wherein an output terminal of the switching circuit is coupled to the second terminal of 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.
15. The power converter of claim 14, further comprising a control circuit configured to generate a control signal for a power transistor in the switch circuit according to the current detection signal, so that the output voltage or the output current meets a power supply requirement of a load.
CN202110081005.1A 2021-01-21 2021-01-21 Power converter Active CN112738953B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN115528897A (en) * 2022-11-29 2022-12-27 深圳市恒运昌真空技术有限公司 Resonant converter and control method thereof

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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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CN106100344A (en) * 2016-07-05 2016-11-09 陕西科技大学 A kind of LLC resonant converter with liter high voltage gain
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115528897A (en) * 2022-11-29 2022-12-27 深圳市恒运昌真空技术有限公司 Resonant converter and control method thereof
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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