Power converter circuit

Abstract

The power converter circuit of the present application comprises a primary side circuit, a secondary side circuit, and a coupling network arranged between the primary side circuit and the secondary side circuit, the coupling network comprising a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor, the first inductor, the first capacitor and the second inductor are connected in series between a first output end of the primary side circuit and a first input end of the secondary side circuit, one end of the third capacitor is connected to a second output end of the primary side circuit, and the other end is connected to a second input end of the secondary side circuit, one end of the second capacitor is connected between the first inductor and the first capacitor, and the other end is connected to the second input end of the secondary side circuit.

Description

Technical Field

[0001] This invention relates to power converter technology, and more particularly to a power converter circuit. Background Technology

[0002] Switching power supplies have been widely used in daily life and industry. Existing power converters generally use isolation transformers to achieve electrical isolation. However, with the increasing demand for convenient power supplies, the size of power supplies is becoming smaller and smaller. In isolation power supplies, the transformer is generally the largest component, so the use of transformers severely limits the further improvement of power density. Summary of the Invention

[0003] In view of this, the present invention provides a power converter circuit that achieves electrical isolation between the primary and secondary circuits through a simple capacitor isolation structure without using an isolation transformer, and can achieve constant voltage and constant current output characteristics independent of load size, as well as more flexible output control capability.

[0004] A first aspect of the present invention is to provide a power converter circuit, the power converter circuit including a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein...

[0005] The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor.

[0006] The first inductor, the first capacitor, and the second inductor are connected in series between the first output terminal of the primary circuit and the first input terminal of the secondary circuit.

[0007] One end of the third capacitor is connected to the second output terminal of the primary circuit, and the other end is connected to the second input terminal of the secondary circuit.

[0008] One end of the second capacitor is connected between the first inductor and the first capacitor, and the other end is connected to the second input terminal of the secondary side circuit.

[0009] A second aspect of the present invention is to provide a power converter circuit, the power converter circuit including a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein...

[0010] The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor.

[0011] The first capacitor and the second inductor are connected in series between the first output terminal of the primary circuit and the first input terminal of the secondary circuit.

[0012] The first inductor and the third capacitor are connected in series between the second output terminal of the primary circuit and the second input terminal of the secondary circuit.

[0013] One end of the second capacitor is connected to the first output terminal of the primary circuit, and the other end is connected to the second input terminal of the secondary circuit.

[0014] A third aspect of the present invention is to provide a power converter circuit, the power converter circuit including a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein...

[0015] The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor.

[0016] The first inductor and the first capacitor are connected in series between the first output terminal of the primary circuit and the first input terminal of the secondary circuit.

[0017] The third capacitor and the second inductor are connected in series between the second output terminal of the primary circuit and the second input terminal of the secondary circuit.

[0018] One end of the second capacitor is connected between the first inductor and the first capacitor, and the other end is connected between the third capacitor and the second inductor.

[0019] A fourth aspect of the present invention is to provide a power converter circuit, the power converter circuit including a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein...

[0020] The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor.

[0021] One end of the first capacitor is connected to the first output terminal of the primary circuit, and the other end is connected to the first input terminal of the secondary circuit.

[0022] The first inductor, the third capacitor, and the second inductor are connected in series between the second output terminal of the primary circuit and the second input terminal of the secondary circuit.

[0023] One end of the second capacitor is connected to the first output terminal of the primary circuit, and the other end is connected between the third capacitor and the second inductor.

[0024] Preferably, the inductance values ​​of the first inductor and the second inductor are variable, and the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor are variable.

[0025] Preferably, the inductance value of the second inductor is reduced to zero or close to zero.

[0026] Preferably, the coupling network has constant voltage and constant current operating frequency points.

[0027] Preferably, the output load of the secondary side circuit is a rechargeable battery.

[0028] Preferably, the primary side circuit includes an inverter circuit.

[0029] Preferably, the inverter circuit is a Class E inverter circuit, a half-bridge inverter circuit, a full-bridge inverter circuit, or a multi-level inverter circuit.

[0030] Preferably, the switching frequency of the inverter circuit is close to the resonant frequency of the coupling network.

[0031] Preferably, the switching frequency of the inverter circuit is adjusted such that the output impedance of the inverter circuit is weakly inductive.

[0032] Preferably, the switching frequency of the inverter circuit is adjusted so that the output impedance of the inverter circuit is weakly capacitive.

[0033] Preferably, the inverter circuit is a full-bridge inverter circuit comprising an H-bridge consisting of four switching elements.

[0034] Preferably, the primary side circuit further includes a primary side rectifier circuit disposed before the inverter circuit.

[0035] Preferably, the primary-side rectifier circuit is a full-bridge rectifier circuit comprising an H-bridge consisting of four diodes.

[0036] Preferably, the inverter circuit includes a third inductor, an inverter switching element, and a fourth capacitor. The third inductor is connected between the input terminal of the inverter circuit and the first output terminal of the primary side circuit. The inverter switching element and the fourth capacitor are connected in parallel between the first output terminal and the second output terminal of the primary side circuit.

[0037] Preferably, the inverter switching element is a bidirectional switching element.

[0038] Preferably, the secondary side circuit includes a secondary side rectifier circuit.

[0039] Preferably, the secondary rectifier circuit is a single diode rectifier circuit, a half-bridge rectifier circuit, a full-bridge rectifier circuit, or a multi-level rectifier circuit.

[0040] Preferably, the secondary rectifier circuit is a full-bridge rectifier circuit comprising an H-bridge consisting of four diodes.

[0041] Preferably, the secondary rectifier circuit is a full-bridge rectifier circuit comprising an H-bridge consisting of four switching elements.

[0042] Preferably, the secondary-side circuit further includes a DC / DC converter disposed after the secondary-side rectifier circuit.

[0043] Preferably, it further includes a feedback control circuit, which generates a feedback signal based on the output signal of the secondary side circuit, converts the feedback signal into a drive signal, and outputs it to the primary side circuit.

[0044] Preferably, the first capacitor, the second capacitor, and the third capacitor are safety capacitors.

[0045] According to the power converter circuit of the present invention, the first to third capacitors are used for isolation, so that electrical isolation is achieved between the primary side circuit and the secondary side circuit. Compared with the isolation transformer, the energy loss of the capacitor is significantly reduced, which improves the system energy conversion efficiency, has higher power density and lower electromagnetic noise, and can achieve constant voltage and constant current output characteristics independent of load size, as well as more flexible output control capability.

[0046] Furthermore, in the power converter circuit of the present invention, the first and second inductors and the first to third capacitors form a resonant network, and the output current of the primary circuit and the input current of the secondary circuit are relatively independent, thereby allowing for a large adjustment range of voltage gain and current gain. Moreover, by implementing a soft-switching state for the inverter circuit in the primary circuit, switching losses and electromagnetic interference are reduced, further improving the system's power conversion efficiency and facilitating electromagnetic compatibility. Attached Figure Description

[0047] Figure 1 This is a circuit diagram illustrating the power converter circuit according to Embodiment 1 of the present invention.

[0048] Figure 2 This is a circuit diagram illustrating closed-loop feedback control of the power converter circuit according to Embodiment 1 of the present invention.

[0049] Figure 3 This is a circuit structure diagram illustrating the power converter circuit involved in Embodiment 1 of the present invention.

[0050] Figure 4 yes Figure 3 The equivalent circuit diagram of the power converter circuit shown is shown.

[0051] Figure 5 It means Figure 3 The graph shown illustrates how the voltage gain of the power converter circuit varies with the switching frequency.

[0052] Figure 6 It means Figure 3 The graph shown illustrates how the current gain of the power converter circuit varies with the switching frequency.

[0053] Figure 7 It means Figure 3 The diagram shows the operating waveforms of the power converter circuit.

[0054] Figure 8 This is a circuit structure diagram of a power converter circuit according to a variation of Embodiment 1 of Embodiment 1 of the present invention.

[0055] Figure 9 This is a circuit structure diagram of a power converter circuit according to a variation of Embodiment 1 of the present invention, Example 2.

[0056] Figure 10 This is a circuit structure diagram of the power converter circuit involved in a variation of Embodiment 1 of the present invention, Example 3.

[0057] Figure 11 This is a circuit structure diagram of the power converter circuit involved in Embodiment 2 of Embodiment 1 of the present invention.

[0058] Figure 12 It means Figure 11 The diagram shows the operating waveforms of the power converter circuit.

[0059] Figure 13 This is a circuit structure diagram of the power converter circuit involved in a variation of Embodiment 2 of Embodiment 1 of the present invention.

[0060] Figure 14 This is a circuit structure diagram of a power converter circuit according to a variation of Embodiment 2 of Embodiment 1 of the present invention.

[0061] Figure 15 This is a circuit structure diagram showing the case where the output load of the power converter circuit according to Embodiment 1 of the present invention is a rechargeable battery.

[0062] Figure 16 This is a circuit diagram illustrating the power converter circuit according to Embodiment 2 of the present invention.

[0063] Figure 17 This is a circuit diagram illustrating the power converter circuit according to Embodiment 3 of the present invention.

[0064] Figure 18 This is a circuit diagram illustrating the power converter circuit according to Embodiment 4 of the present invention. Detailed Implementation

[0065] Hereinafter, in order to illustrate the present invention in more detail, the embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

[0066] It should be noted that many specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can also be implemented in other ways different from those described herein, and those skilled in the art can make various extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0067] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than exclusive or exhaustive. In other words, they mean "including but not limited to."

[0068] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0069] Implementation Method 1

[0070] The power converter circuit of Embodiment 1 of the present invention includes a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit. Hereinafter, in conjunction with... Figure 1 This describes the circuit diagram of the power converter circuit involved in Embodiment 1 of the present invention. Figure 1 As shown, an inverter circuit 1 is shown as an example of a primary side circuit, and a secondary side rectifier circuit 3 is shown as an example of a secondary side circuit. A coupling network 2 is provided between the inverter circuit 1 and the secondary side rectifier circuit 3.

[0071] Inverter circuit 1 is used to generate alternating current with a predetermined frequency. Its input can be either direct current or alternating current. Inverter circuit 1 can adopt various types of inverter circuit structures, such as half-bridge inverter circuit, full-bridge inverter circuit, or Class E inverter circuit. In addition, inverter circuit 1 can also be a multi-level inverter circuit.

[0072] The secondary-side rectifier circuit 3 is used to convert alternating current (AC) into direct current (DC). The secondary-side rectifier circuit 3 can also adopt various types of rectifier circuit structures, such as a single diode rectifier circuit, a half-bridge rectifier circuit, and a full-bridge rectifier circuit. Furthermore, the secondary-side rectifier circuit 3 can also be a multi-level rectifier circuit.

[0073] The coupling network 2 is used to achieve electrical isolation between the inverter circuit 1 and the secondary-side rectifier circuit 3. Specifically, the coupling network 2 includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, and a third capacitor C3. The inductance values ​​of the first inductor L1 and the second inductor L2 are variable, and the inductance value of the second inductor L2 can be reduced to zero or close to zero. The first capacitor C1, the second capacitor C2, and the third capacitor C3 can be safety capacitors, and their capacitance values ​​are variable.

[0074] The first inductor L1, the first capacitor C1, and the second inductor L2 are connected in series in the primary circuit. Figure 1 The first output terminal of the inverter circuit 1) and the secondary side circuit ( Figure 1 The first input terminal of the secondary-side rectifier circuit 3) is connected to the middle. One end of the third capacitor C3 is connected to the primary-side circuit ( Figure 1 The middle part is the second output terminal of inverter circuit 1), and the other end is connected to the secondary side circuit ( Figure 1 The second input terminal of the secondary-side rectifier circuit 3) is located in the middle. One end of the second capacitor C2 is connected between the first inductor L1 and the first capacitor C1, and the other end is connected to the secondary-side circuit ( Figure 1 The middle part is the second input terminal of the secondary side rectifier circuit 3).

[0075] Furthermore, it is preferable to adjust the switching frequency of the inverter circuit 1 so that the switching frequency of the inverter circuit 1 is close to the resonant frequency of the coupling network 2, thereby enabling the switching elements of the inverter circuit 1 to achieve a soft-switching state.

[0076] For example, the output impedance of inverter circuit 1 (including the first and second inductors L1-L2 and the first to third capacitors C1-C3 of coupling network 2) is weakly inductive, and the switching frequency of inverter circuit 1 is slightly higher than the resonant frequency of coupling network 2, thus enabling zero-voltage switching (ZVS) of the switching elements of inverter circuit 1. Alternatively, the output impedance of inverter circuit 1 is weakly capacitive, and the switching frequency of inverter circuit 1 is slightly lower than the resonant frequency of coupling network 2, thus enabling zero-current switching (ZCS) of the switching elements of inverter circuit 1.

[0077] Among them, soft-switching technology applies the principle of resonance, causing the voltage (or current) in the switching element to change according to a sinusoidal or quasi-sinusoidal law. When the voltage crosses zero, the switching element is turned on (or, when the current naturally crosses zero, the switching element is turned off), thereby reducing the switching losses of the switching element.

[0078] According to the power converter circuit constructed as described above, the first to third capacitors are used for isolation, so that electrical isolation is achieved between the primary side circuit and the secondary side circuit. Compared with the isolation transformer, the energy loss of the capacitor is significantly reduced, which improves the system's energy conversion efficiency, has higher power density and lower electromagnetic noise, and can achieve constant voltage and constant current output characteristics independent of load size, as well as more flexible output control capability.

[0079] Furthermore, in the aforementioned power converter circuit, the first and second inductors, along with the first to third capacitors, form a resonant network. The output current of the primary circuit and the input current of the secondary circuit are relatively independent, thus allowing for a large adjustment range for both voltage and current gains. Moreover, by implementing soft-switching of the inverter circuit in the primary circuit, switching losses and electromagnetic interference are reduced, further improving the system's power conversion efficiency and facilitating electromagnetic compatibility.

[0080] Furthermore, closed-loop feedback control can be applied to the aforementioned power converter circuit to form an output closed-loop structure. For example... Figure 2 As shown, in Figure 1 The circuit structure shown further includes a feedback control circuit 4. The feedback control circuit 4 generates a feedback signal based on the output signal of the secondary rectifier circuit 3, converts the feedback signal into a drive signal, and outputs it to the inverter circuit 1.

[0081] Specifically, the feedback control circuit 4 measures the output signal of the secondary side rectifier circuit 3, compares the measured signal with the reference signal to generate an error signal, and then provides the error signal to the controller as a feedback signal after signal isolation and amplification by an optocoupler. The controller converts the feedback signal into a drive signal and provides it to the inverter circuit 1.

[0082] The following describes an embodiment of the present invention, 1, with reference to a specific circuit structure.

[0083] <Example 1>

[0084] Figure 3 This is a circuit structure diagram illustrating the power converter circuit according to Embodiment 1 of the present invention. Figure 4 yes Figure 3 The equivalent circuit diagram of the power converter circuit shown is as follows. Figure 5 and Figure 6 They represent respectively Figure 3The graphs shown illustrate how the voltage gain and current gain of the power converter circuit vary with the switching frequency.

[0085] like Figure 3 As shown, inverter circuit 1 is configured as a full-bridge inverter circuit comprising an H-bridge consisting of four switching elements Q1 to Q4, and secondary-side rectifier circuit 3 is configured as a full-bridge rectifier circuit comprising an H-bridge consisting of four diodes D1 to D4. The input of inverter circuit 1 is a DC input Vi. An input capacitor Ci is provided before inverter circuit 1, and an output capacitor Co and a load resistor RL are provided after secondary-side rectifier circuit 3.

[0086] Among them, the switching elements Q1 to Q4 can be switching elements composed of transistors, triodes, MOSFETs, IGBTs and other devices.

[0087] according to Figure 4 The equivalent circuit diagram shown has a voltage gain Gv that is the sum of the output voltage V2 and the input voltage V. AB The ratio satisfies Gv = V² / V AB The current gain Gi is the sum of the output current I2 and the input voltage V. AB The ratio satisfies Gi = I² / V AB .

[0088] Figure 5 The graph shows the voltage gain Gv varying with the switching frequency fs of inverter circuit 1. The solid and dashed lines represent the equivalent load Rle of 30Ω and 200Ω, respectively. Figure 5 It can be seen that there are two constant voltage output operating frequency points (switching frequency points).

[0089] also, Figure 6 The graph shows the current gain Gi as a function of the switching frequency fs of inverter circuit 1. The solid and dashed lines represent the equivalent load Rle of 30Ω and 200Ω, respectively. Figure 6 It can be seen that there is a constant current output operating frequency point (switching frequency point).

[0090] Therefore, it can be seen that by adjusting the switching frequency fs of inverter circuit 1, the output voltage and output current characteristics can be controlled. Next, combined with... Figure 7 The operating waveforms of the power converter circuit shown illustrate the soft-switching states of switching elements Q1 to Q4.

[0091] like Figure 7 As shown, the current I flowing through the first inductor L1 (L1) The phase relative to the input voltage V ABWith hysteresis, the output impedance of inverter circuit 1 is weakly inductive. The switching elements Q1 to Q4 of inverter circuit 1 achieve zero-voltage switching (ZVS), which is a soft-switching state, reducing switching losses and electromagnetic interference. This can further improve the system's power conversion efficiency and facilitate electromagnetic compatibility.

[0092] <Modification of Example 1>

[0093] Figure 8 The circuit structure of a power converter circuit of a variation of Embodiment 1 of the present invention is shown. Figure 8 In, relative to Figure 3 The power converter circuit shown replaces diodes D1 to D4 in the secondary rectifier circuit 2 with switching elements S1 to S4. These switching elements S1 to S4 can be devices such as transistors, triodes, MOSFETs, or IGBTs.

[0094] By replacing the rectifier diodes with switching elements, the diode conduction losses can be reduced, thereby improving the system's power conversion efficiency. Furthermore, with switching elements used in the secondary-side rectifier circuit, power can be transmitted from left to right or vice versa. For reverse power transmission, the functions of the original rectifier and inverter circuit modules can be interchanged.

[0095] Figure 9 The circuit structure of a power converter circuit of a variation of Embodiment 1 of the present invention is shown in Example 2. Figure 9 In, relative to Figure 8 In the power converter circuit shown, the inverter circuit input is not a DC input, but an AC input. In this case, a primary-side rectifier circuit is provided before the inverter circuit in the primary-side circuit at the AC input terminal. This primary-side rectifier circuit is, for example, a full-bridge rectifier circuit comprising an H-bridge consisting of four diodes D1 to D4.

[0096] Figure 10 The circuit structure of a power converter circuit of a variation of Embodiment 1 of the present invention is shown. Figure 10 In, relative to Figure 9 The power converter circuit shown has a DC / DC converter installed after the secondary rectifier circuit on the output side, which allows for independent adjustment of the load voltage or current, thereby further expanding the adjustment range.

[0097] <Example 2>

[0098] Figure 11 This is a circuit structure diagram illustrating the power converter circuit according to Embodiment 2 of Embodiment 1 of the present invention. Figure 12 It means Figure 11The diagram shows the operating waveforms of the power converter circuit.

[0099] like Figure 11 As shown, with Figure 3 Compared to the power converter circuit of Embodiment 1 shown, the inverter circuit 1 is configured as a Class E inverter circuit. Specifically, the inverter circuit 1 includes a third inductor Li, an inverter switching element Q1, and a fourth capacitor Cr. The third inductor Li is connected between the input terminal of the inverter circuit 1 and the first output terminal of the primary side circuit, and the inverter switching element Q1 and the fourth capacitor Cr are connected in parallel between the first output terminal and the second output terminal of the primary side circuit.

[0100] When inverter switch Q1 is turned on, the input terminal charges the third inductor Li, and the current through the third inductor Li increases linearly. After inverter switch Q1 is turned off, the third inductor Li and the fourth capacitor Cr form a resonant circuit that oscillates, thereby outputting alternating current.

[0101] Next, combined Figure 12 The operating waveforms of the power converter circuit shown illustrate the soft-switching state of the inverter switching element Q1.

[0102] like Figure 12 As shown, the drive signal PWM for inverter switching element Q1 (Q1) When the voltage level changes from high to low, the drain-source voltage V of the inverter switching element Q1... DS(Q1) The voltage rises slowly, indicating ZVS shutdown. This is achieved through the PWM drive signal for inverter switching element Q1. (Q1) When the voltage level changes from low to high, the drain-source voltage V of the inverter switching element Q1... DS(Q1) The voltage is close to zero, indicating near-ZVS conduction. Therefore, the inverter switching element Q1 achieves a soft-switching state, reducing switching losses and electromagnetic interference, thereby further improving the system's power conversion efficiency and facilitating electromagnetic compatibility.

[0103] <Modified Example 2>

[0104] Figure 13 The circuit structure of a power converter circuit, a variation of Embodiment 2 of Embodiment 1 of the present invention, is shown. Figure 13 As shown, relative to Figure 11 In the power converter circuit shown, the inverter circuit input is not DC, but AC. Therefore, the inverter switching element Q1 is set as a bidirectional switching element, thereby avoiding the use of a full-bridge rectifier diode at the input and reducing diode conduction losses.

[0105] Figure 14 The circuit structure of a power converter circuit, a variation of Embodiment 2 of Embodiment 1 of the present invention, is shown. Relative to... Figure 13The power converter circuit shown replaces diodes D1-D4 in the secondary rectifier circuit on the output side with switching elements S1-S4. Furthermore, a DC / DC converter is installed after the secondary rectifier circuit, allowing independent adjustment of the load voltage or current, thereby expanding the adjustment range. The switching elements S1-S4 can be transistors, triodes, MOSFETs, IGBTs, or similar devices.

[0106] The various embodiments of the power converter circuit according to Embodiment 1 of the present invention have been described above, but are not limited thereto. For example, since the power converter circuit can output constant voltage or constant current at different operating frequency points, the output load of the secondary side circuit can be a rechargeable battery. Figure 15 The diagram shows a circuit structure with a rechargeable battery as the output load. The power converter circuit can charge the rechargeable battery using either constant voltage or constant current.

[0107] Implementation Method 2

[0108] Figure 16 This is a circuit diagram illustrating the power converter circuit according to Embodiment 2 of the present invention. The only difference between Embodiment 2 and Embodiment 1 is the position of the first inductor L1.

[0109] In the power converter circuit of Embodiment 1, the first inductor L1 is connected between the first output terminal of the primary side circuit (inverter circuit) and the first capacitor C1. In the power converter circuit of Embodiment 2, the first inductor L1 is connected between the second output terminal of the primary side circuit (inverter circuit) and the third capacitor C3.

[0110] According to the power converter circuit of Embodiment 2, the same technical effects as those of the power converter circuit of Embodiment 1 can be obtained.

[0111] Implementation Method 3

[0112] Figure 17 This is a circuit diagram illustrating the power converter circuit according to Embodiment 3 of the present invention. The only difference between Embodiment 3 and Embodiment 1 is the position of the second inductor L2.

[0113] In the power converter circuit of Embodiment 1, the second inductor L2 is connected between the first capacitor C1 and the first input terminal of the secondary side circuit (rectifier circuit). In the power converter circuit of Embodiment 3, the second inductor L2 is connected between the third capacitor C3 and the second input terminal of the secondary side circuit (rectifier circuit).

[0114] According to the power converter circuit of Embodiment 3, the same technical effects as those of the power converter circuit of Embodiment 1 can be obtained.

[0115] Implementation Method 4

[0116] Figure 18 This is a circuit diagram illustrating the power converter circuit according to Embodiment 4 of the present invention. The only difference between Embodiment 4 and Embodiment 1 is that the positions of the first inductor L1 and the second inductor L2 are different.

[0117] In the power converter circuit of Embodiment 1, the first inductor L1 is connected between the first output terminal of the primary side circuit (inverter circuit) and the first capacitor C1, and the second inductor L2 is connected between the first capacitor C1 and the first input terminal of the secondary side circuit (rectifier circuit). In the power converter circuit of Embodiment 4, the first inductor L1 is connected between the second output terminal of the primary side circuit (inverter circuit) and the third capacitor C3, and the second inductor L2 is connected between the third capacitor C3 and the second input terminal of the secondary side circuit (rectifier circuit).

[0118] According to the power converter circuit of Embodiment 4, the same technical effects as those of the power converter circuit of Embodiment 1 can be obtained.

[0119] This invention has been described in detail, but the above embodiments are merely examples of all embodiments, and this invention is not limited thereto. Any modifications to the constituent elements of the embodiments can be made within the scope of this invention.

Claims

1. A power converter circuit, comprising a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, characterized in that, The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor. The first inductor, the first capacitor, and the second inductor are connected in series between the first output terminal of the primary circuit and the first input terminal of the secondary circuit. One end of the third capacitor is connected to the second output terminal of the primary circuit, and the other end is connected to the second input terminal of the secondary circuit. One end of the second capacitor is connected between the first inductor and the first capacitor, and the other end is connected to the second input terminal of the secondary side circuit.

2. A power converter circuit, comprising a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, characterized in that, The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor. The first capacitor and the second inductor are connected in series between the first output terminal of the primary circuit and the first input terminal of the secondary circuit. The first inductor and the third capacitor are connected in series between the second output terminal of the primary circuit and the second input terminal of the secondary circuit. One end of the second capacitor is connected to the first output terminal of the primary circuit, and the other end is connected to the second input terminal of the secondary circuit.

3. A power converter circuit, comprising a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, characterized in that, The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor. The first inductor and the first capacitor are connected in series between the first output terminal of the primary circuit and the first input terminal of the secondary circuit. The third capacitor and the second inductor are connected in series between the second output terminal of the primary circuit and the second input terminal of the secondary circuit. One end of the second capacitor is connected between the first inductor and the first capacitor, and the other end is connected between the third capacitor and the second inductor.

4. A power converter circuit, comprising a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, characterized in that, The coupling network includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor. One end of the first capacitor is connected to the first output terminal of the primary circuit, and the other end is connected to the first input terminal of the secondary circuit. The first inductor, the third capacitor, and the second inductor are connected in series between the second output terminal of the primary circuit and the second input terminal of the secondary circuit. One end of the second capacitor is connected to the first output terminal of the primary circuit, and the other end is connected between the third capacitor and the second inductor.

5. The power converter circuit according to any one of claims 1 to 4, characterized in that, The inductance values ​​of the first inductor and the second inductor are variable, and the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor are variable.

6. The power converter circuit according to any one of claims 1 to 4, characterized in that, The coupling network has constant voltage and constant current operating frequency points.

7. The power converter circuit as described in claim 6, characterized in that, The output load of the secondary side circuit is a rechargeable battery.

8. The power converter circuit according to any one of claims 1 to 4, characterized in that, The primary circuit includes an inverter circuit.

9. The power converter circuit as described in claim 8, characterized in that, The inverter circuit is a Class E inverter circuit, a half-bridge inverter circuit, a full-bridge inverter circuit, or a multi-level inverter circuit.

10. The power converter circuit as described in claim 8, characterized in that, The switching frequency of the inverter circuit is close to the resonant frequency of the coupling network.

11. The power converter circuit as described in claim 10, characterized in that, The switching frequency of the inverter circuit is adjusted so that the output impedance of the inverter circuit is weakly inductive.

12. The power converter circuit as described in claim 10, characterized in that, The switching frequency of the inverter circuit is adjusted so that the output impedance of the inverter circuit is weakly capacitive.

13. The power converter circuit as described in claim 8, characterized in that, The inverter circuit is a full-bridge inverter circuit comprising an H-bridge consisting of four switching elements.

14. The power converter circuit as described in claim 8, characterized in that, The primary side circuit also includes a primary side rectifier circuit disposed before the inverter circuit.

15. The power converter circuit as described in claim 14, characterized in that, The primary-side rectifier circuit is a full-bridge rectifier circuit comprising an H-bridge consisting of four diodes.

16. The power converter circuit as described in claim 8, characterized in that, The inverter circuit includes a third inductor, an inverter switching element, and a fourth capacitor. The third inductor is connected between the input terminal of the inverter circuit and the first output terminal of the primary side circuit. The inverter switching element and the fourth capacitor are connected in parallel between the first output terminal and the second output terminal of the primary side circuit.

17. The power converter circuit as described in claim 16, characterized in that, The inverter switching element is a bidirectional switching element.

18. The power converter circuit according to any one of claims 1 to 4, characterized in that, The secondary side circuit includes a secondary side rectifier circuit.

19. The power converter circuit as described in claim 18, characterized in that, The secondary rectifier circuit is a single diode rectifier circuit, a half-bridge rectifier circuit, a full-bridge rectifier circuit, or a multi-level rectifier circuit.

20. The power converter circuit as described in claim 18, characterized in that, The secondary rectifier circuit is a full-bridge rectifier circuit that includes an H-bridge consisting of four diodes.

21. The power converter circuit as described in claim 18, characterized in that, The secondary rectifier circuit is a full-bridge rectifier circuit comprising an H-bridge consisting of four switching elements.

22. The power converter circuit as described in claim 18, characterized in that, The secondary-side circuit also includes a DC / DC converter disposed after the secondary-side rectifier circuit.

23. The power converter circuit according to any one of claims 1 to 4, characterized in that, It also includes a feedback control circuit, which generates a feedback signal based on the output signal of the secondary side circuit, converts the feedback signal into a drive signal, and outputs it to the primary side circuit.

24. The power converter circuit according to any one of claims 1 to 4, characterized in that, The first capacitor, the second capacitor, and the third capacitor are safety capacitors.

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