CN213846541U - Power converter circuit - Google Patents
Power converter circuit Download PDFInfo
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- CN213846541U CN213846541U CN202023337205.9U CN202023337205U CN213846541U CN 213846541 U CN213846541 U CN 213846541U CN 202023337205 U CN202023337205 U CN 202023337205U CN 213846541 U CN213846541 U CN 213846541U
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Abstract
The utility model discloses a power converter circuit is including once the side circuit, the secondary side circuit, and set up the coupling network between once side circuit and secondary side circuit, the coupling network includes first inductor, the second inductor, first condenser, second condenser and third condenser, first inductor, first condenser and second inductor series connection are in proper order between the first output of once side circuit and the first input of secondary side circuit, the one end of third condenser is connected to the second output of once side circuit, the other end is connected to the second input of secondary side circuit, the one end of second condenser is connected between first inductor and first condenser, the other end is connected to the second input of secondary side circuit.
Description
Technical Field
The utility model relates to a power converter technique especially relates to a power converter circuit.
Background
Switching power supplies have been widely used in daily life and industry, and existing power converters generally use isolation transformers to achieve electrical isolation. However, with the demand of convenience of the power supply, the volume of the power supply is required to be smaller and smaller, and the transformer in the isolated power supply is generally the largest component, so that the use of the transformer seriously limits the further improvement of the power density of the power supply.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a power converter circuit, which realizes electrical isolation between a primary side circuit and a secondary side circuit through a simple capacitance isolation structure without using an isolation transformer, and can realize a constant voltage and constant current output characteristic irrelevant to a load size and more flexible output regulation capability.
In a first aspect of the present invention, a power converter circuit is provided, which comprises a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein,
the coupling network comprises 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 sequentially connected in series between a first output terminal of the primary-side circuit and a first input terminal of the secondary-side circuit,
one end of the third capacitor is connected to a second output terminal of the primary-side circuit, and the other end is connected to the second input terminal 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 terminal of the secondary-side circuit.
A second aspect of the present invention is to provide a power converter circuit, which includes a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein,
the coupling network comprises 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 in this order between a first output terminal of the primary-side circuit and a first input terminal of the secondary-side circuit,
the first inductor and the third capacitor are connected in series in this order between the second output terminal of the primary-side circuit and the second input terminal of the secondary-side circuit,
one end of the second capacitor is connected to the first output terminal of the primary-side circuit, and the other end is connected to the second input terminal of the secondary-side circuit.
A third aspect of the present invention is to provide a power converter circuit, which includes a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein,
the coupling network comprises 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 in this order between a first output terminal of the primary-side circuit and a first input terminal of the secondary-side circuit,
the third capacitor and the second inductor are connected in series in this order between the second output terminal of the primary-side circuit and the second input terminal 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 between the third capacitor and the second inductor.
A fourth aspect of the present invention is to provide a power converter circuit, which includes a primary side circuit, a secondary side circuit, and a coupling network disposed between the primary side circuit and the secondary side circuit, wherein,
the coupling network comprises 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 a first output terminal of the primary-side circuit, and the other end is connected to a first input terminal of the secondary-side circuit,
the first inductor, the third capacitor and the second inductor are connected in series in this order between the second output terminal of the primary-side circuit and the second input terminal of the secondary-side circuit,
one end of the second capacitor is connected to the first output terminal of the primary-side circuit, and the other end is connected between the third capacitor and the second inductor.
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.
Preferably, the inductance value of the second inductor is reduced to zero or close to zero.
Preferably, the coupling network has an operating frequency point of constant voltage and constant current.
Preferably, the output load of the secondary side circuit is a rechargeable battery.
Preferably, the primary side circuit includes an inverter circuit.
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.
Preferably, the switching frequency of the inverter circuit is close to the resonant frequency of the coupling network.
Preferably, the switching frequency of the inverter circuit is adjusted so that the output impedance of the inverter circuit is weakly inductive.
Preferably, the switching frequency of the inverter circuit is adjusted such that the output impedance of the inverter circuit is weak capacitive.
Preferably, the inverter circuit is a full-bridge inverter circuit including an H-bridge composed of four switching elements.
Preferably, the primary-side circuit further includes a primary-side rectifying circuit provided before the inverter circuit.
Preferably, the primary side rectifier circuit is a full bridge rectifier circuit including an H-bridge composed of four diodes.
Preferably, the inverter circuit includes a third inductor, an inverter switching element, and a fourth capacitor, the third inductor being connected between an input terminal of the inverter circuit and the first output terminal of the primary side circuit, and the inverter switching element and the fourth capacitor being connected in parallel between the first output terminal and the second output terminal of the primary side circuit.
Preferably, the inverting switching element is a bidirectional switching element.
Preferably, the secondary side circuit includes a secondary side rectifying circuit.
Preferably, the secondary side rectifying circuit is a single diode rectifying circuit, a half-bridge rectifying circuit, a full-bridge rectifying circuit or a multi-level rectifying circuit.
Preferably, the secondary side rectifier circuit is a full bridge rectifier circuit including an H-bridge composed of four diodes.
Preferably, the secondary-side rectifying circuit is a full-bridge rectifying circuit including an H-bridge composed of four switching elements.
Preferably, the secondary-side circuit further includes a DC/DC converter disposed after the secondary-side rectifying circuit.
Preferably, the secondary side circuit further comprises a feedback control circuit which generates a feedback signal based on an output signal of the secondary side circuit, converts the feedback signal into a drive signal, and outputs the drive signal to the primary side circuit.
Preferably, the first capacitor, the second capacitor and the third capacitor are safety capacitors.
According to the utility model discloses a power converter circuit utilizes first to third condenser to keep apart for realize electrical isolation between side circuit and the secondary side circuit, compare with isolation transformer, the electric energy loss of condenser obviously reduces, makes system electric energy conversion efficiency improve, has higher power density and lower electromagnetic noise, and can realize the constant voltage and the constant current output characteristic irrelevant with the load size and more nimble output regulation and control ability.
Furthermore, the utility model discloses an among the power converter circuit, first, second inductance and first to third condenser constitute resonant network, and the output current of the circuit of once side and the input current of secondary side circuit are relatively independent to voltage gain and current gain have great accommodation. In addition, by realizing the soft switching state of the inverter circuit in the primary side circuit, the switching loss and the electromagnetic interference are reduced, the electric energy conversion efficiency of the system can be further improved, and the electromagnetic compatibility is easy to realize.
Drawings
Fig. 1 is a schematic circuit diagram showing a power converter circuit according to embodiment 1 of the present invention.
Fig. 2 is a schematic circuit diagram showing closed-loop feedback control of the power converter circuit according to embodiment 1 of the present invention.
Fig. 3 is a circuit configuration diagram showing a power converter circuit according to example 1 of embodiment 1 of the present invention.
Fig. 4 is an equivalent circuit diagram of the power converter circuit shown in fig. 3.
Fig. 5 is a graph showing a change in voltage gain of the power converter circuit shown in fig. 3 according to the switching frequency.
Fig. 6 is a graph showing a change in current gain of the power converter circuit shown in fig. 3 according to the switching frequency.
Fig. 7 is a diagram showing an operation waveform of the power converter circuit shown in fig. 3.
Fig. 8 is a circuit configuration diagram showing a power converter circuit according to variation 1 of embodiment 1 of the present invention.
Fig. 9 is a circuit configuration diagram showing a power converter circuit according to variation 2 of embodiment 1 of the present invention.
Fig. 10 is a circuit configuration diagram showing a power converter circuit according to variation 3 of embodiment 1 of the present invention.
Fig. 11 is a circuit configuration diagram showing a power converter circuit according to example 2 of embodiment 1 of the present invention.
Fig. 12 is a diagram showing an operation waveform of the power converter circuit shown in fig. 11.
Fig. 13 is a circuit configuration diagram showing a power converter circuit according to variation 1 of embodiment 2 of embodiment 1 of the present invention.
Fig. 14 is a circuit configuration diagram showing a power converter circuit according to variation 2 of embodiment 1 of the present invention.
Fig. 15 is a circuit configuration diagram showing a case where an output load of the power converter circuit according to embodiment 1 of the present invention is a rechargeable battery.
Fig. 16 is a schematic circuit diagram showing a power converter circuit according to embodiment 2 of the present invention.
Fig. 17 is a schematic circuit diagram showing a power converter circuit according to embodiment 3 of the present invention.
Fig. 18 is a schematic circuit diagram showing a power converter circuit according to embodiment 4 of the present invention.
Detailed Description
In order to explain the present invention in more detail, the following describes a mode for carrying out the present invention with reference to the accompanying drawings.
It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in other specific forms than those herein described and it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention.
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.
The utility model discloses embodiment 1's power converter circuit includes and inclines circuit, secondary side circuit and sets up the coupling network between once circuit and secondary side circuit. Hereinafter, a schematic circuit diagram of a power converter circuit according to embodiment 1 of the present invention will be described with reference to fig. 1. As shown in fig. 1, an inverter circuit 1 is shown as an example of a primary side circuit, a secondary side rectifier circuit 3 is shown as an example of a secondary side circuit, and a coupling network 2 is provided between the inverter circuit 1 and the secondary side rectifier circuit 3.
The inverter circuit 1 is used to generate an alternating current having a predetermined frequency, and its input may be a direct current or an alternating current. The inverter circuit 1 may be configured as various types of inverter circuits, such as a half-bridge inverter circuit, a full-bridge inverter circuit, or a class E inverter circuit. In addition, the inverter circuit 1 may be a multi-level inverter circuit.
The secondary side rectifying circuit 3 is used for converting alternating current into direct current. The secondary side rectifier circuit 3 may also be a rectifier circuit of various types, such as a single diode rectifier circuit, a half-bridge rectifier circuit, a full-bridge rectifier circuit, or the like. The secondary-side rectifier circuit 3 may be a multilevel rectifier circuit.
The coupling network 2 is used for realizing the electrical isolation between the inverter circuit 1 and the secondary side rectification 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 inductance L2 can be reduced to zero or close to zero. The first capacitor C1, the second capacitor C2, and the third capacitor C3 may be regular capacitors, and the capacitance values of the first capacitor C1, the second capacitor C2, and the third capacitor C3 may be variable.
The first inductor L1, the first capacitor C1, and the second inductor L2 are sequentially connected in series between a first output terminal of the primary-side circuit (the inverter circuit 1 in fig. 1) and a first input terminal of the secondary-side circuit (the secondary-side rectifier circuit 3 in fig. 1). One end of the third capacitor C3 is connected to the second output terminal of the primary-side circuit (the inverter circuit 1 in fig. 1), and the other end is connected to the second input terminal of the secondary-side circuit (the secondary-side rectifier circuit 3 in fig. 1). 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 a second input end of the secondary-side circuit (the secondary-side rectifying circuit 3 in fig. 1).
Further, it is preferable that the switching frequency of the inverter circuit 1 is adjusted so that the switching frequency of the inverter circuit 1 approaches the resonant frequency of the coupling network 2, and the switching elements of the inverter circuit 1 realize a soft switching state.
For example, the output impedance of the inverter circuit 1 (including the first and second inductors L1-L2 and the first to third capacitors C1-C3 of the coupling network 2) is weak, the Switching frequency of the inverter circuit 1 is slightly larger than the resonant frequency of the coupling network 2, and the Switching elements of the inverter circuit 1 realize Zero Voltage Switching (ZVS). Or the output impedance of the inverter circuit 1 is weak capacitive, the Switching frequency of the inverter circuit 1 is slightly less than the resonant frequency of the coupling network 2, and the Switching element of the inverter circuit 1 realizes Zero Current Switching (ZCS).
In the soft switching technique, a resonance principle is applied to change the voltage (or current) in the switching element 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 loss of the switching element.
According to the power converter circuit configured 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, and therefore, compared with an isolation transformer, the power loss of the capacitors is significantly reduced, the system power conversion efficiency is improved, high power density and low electromagnetic noise are achieved, and a constant voltage and constant current output characteristic independent of the load size and a more flexible output regulation capability can be achieved.
In addition, in the power converter circuit, the first inductor, the second inductor and the first capacitor to the third capacitor form a resonant network, and the output current of the primary side circuit and the input current of the secondary side circuit are relatively independent, so that the voltage gain and the current gain have a large adjusting range. In addition, by realizing the soft switching state of the inverter circuit in the primary side circuit, the switching loss and the electromagnetic interference are reduced, the electric energy conversion efficiency of the system can be further improved, and the electromagnetic compatibility is easy to realize.
In addition, the power converter circuit may be configured to be closed-loop feedback-controlled to form an output closed-loop. As shown in fig. 2, a feedback control circuit 4 is further included on the basis of the circuit configuration shown in fig. 1. The feedback control circuit 4 generates a feedback signal based on an output signal of the secondary side rectification circuit 3, and converts the feedback signal into a drive signal and outputs the drive signal to the inverter circuit 1.
Specifically, the feedback control circuit 4 measures an output signal of the secondary side rectifier circuit 3, compares the measured signal with a reference signal, generates an error signal, performs signal isolation and amplification by photocoupling, and supplies the error signal to the controller as a feedback signal, and the controller converts the feedback signal into a drive signal and supplies the drive signal to the inverter circuit 1.
Hereinafter, an example of embodiment 1 of the present invention will be described with reference to a specific circuit configuration.
< example 1>
Fig. 3 is a circuit configuration diagram showing a power converter circuit according to example 1 of embodiment 1 of the present invention, fig. 4 is an equivalent circuit diagram of the power converter circuit shown in fig. 3, and fig. 5 and 6 are graphs showing changes in voltage gain and current gain of the power converter circuit shown in fig. 3 according to the switching frequency, respectively.
As shown in fig. 3, the inverter circuit 1 is a full-bridge inverter circuit including an H-bridge composed of four switching elements Q1 to Q4, and the secondary-side rectifier circuit 3 is a full-bridge rectifier circuit including an H-bridge composed of four diodes D1 to D4. The input of the inverter circuit 1 is a dc input Vi, an input capacitor Ci is provided in front of the inverter circuit 1, and an output capacitor Co and a load resistor RL are provided behind the secondary side rectifier circuit 3.
The switching elements Q1 to Q4 may be switching elements formed of devices such as transistors, MOSFETs, and IGBTs.
According to the equivalent circuit shown in FIG. 4, the voltage gain Gv is the output voltage V2And an input voltage VABThe ratio of Gv to V is satisfied2/VAB. The current gain Gi is the output current I2And an input voltage VABI.e. satisfy the condition of Gi ═ I2/VAB。
Fig. 5 shows a graph in which the voltage gain Gv varies according to the switching frequency fs of the inverter circuit 1, and the solid line and the broken line show cases in which the equivalent load Rle is 30 Ω and 200 Ω, respectively. As can be seen from fig. 5, there are two operating frequency points (switching frequency points) of the constant voltage output.
Further, fig. 6 shows a graph in which the current gain Gi varies according to the switching frequency fs of the inverter circuit 1, and the solid line and the broken line show cases in which the equivalent load Rle is 30 Ω and 200 Ω, respectively. As can be seen from fig. 6, there is an operating frequency point (switching frequency point) of the constant current output.
From this, it is understood that the output voltage and the output current characteristics can be controlled by adjusting the switching frequency fs of the inverter circuit 1. Next, the soft switching states of the switching elements Q1 to Q4 will be described with reference to the operating waveforms of the power converter circuit shown in fig. 7.
As shown in FIG. 7, the current I flowing through the first inductor L1(L1)Relative to the input voltage VABThe output impedance of the inverter circuit 1 is weak due to hysteresis, and the switching elements Q1-Q4 of the inverter circuit 1 realize Zero Voltage Switching (ZVS), namely, a soft switching state, thereby reducing switching loss and electromagnetic interference, further improving the system electric energy conversion efficiency, and easily realizing electromagnetic compatibility.
< modification of example 1>
Fig. 8 shows a circuit configuration of a power converter circuit according to modification 1 of embodiment 1 of the present invention. In fig. 8, the diodes D1 to D4 of the secondary side rectifier circuit 2 are replaced with switching elements S1 to S4, respectively, with respect to the power converter circuit shown in fig. 3. The switching elements S1 to S4 may be switching elements formed of devices such as transistors, MOSFETs, and IGBTs.
By replacing the rectifier diode with the switching element, the conduction loss of the diode can be reduced, and the electric energy conversion efficiency of the system is improved. In the case where the secondary-side rectifier circuit employs the switching element, power can be transmitted from left to right, or power can be transmitted from right to left in reverse. And the module functions of the original rectification circuit and the original inversion circuit are exchanged during reverse power transmission.
Fig. 9 shows a circuit configuration of a power converter circuit according to variation 2 of embodiment 1 of the present invention. In fig. 9, the input of the inverter circuit is not a direct current input but an alternating current input with respect to the power converter circuit shown in fig. 8. In this case, a primary-side rectifier circuit is provided in front of the inverter circuit in the primary-side circuit of the ac input terminal. The primary side rectifier circuit is, for example, a full bridge rectifier circuit including an H-bridge composed of four diodes D1 to D4.
Fig. 10 shows a circuit configuration of a power converter circuit according to variation 3 of embodiment 1 of the present invention. In fig. 10, in contrast to the power converter circuit shown in fig. 9, a primary DC/DC converter is provided in the secondary-side circuit on the output side after the secondary-side rectifier circuit, whereby the load voltage or current can be independently adjusted, and the adjustment range can be further expanded.
< example 2>
Fig. 11 is a circuit configuration diagram showing a power converter circuit according to example 2 of embodiment 1 of the present invention, and fig. 12 is a diagram showing an operation waveform of the power converter circuit shown in fig. 11.
As shown in fig. 11, the inverter circuit 1 is a class E inverter circuit as compared with the power converter circuit of embodiment 1 shown in fig. 3. 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.
When the inverting switching element Q1 is turned on, the input terminal charges the third inductor Li, and the current through the third inductor Li increases linearly. After the inverting switching element Q1 is turned off, the third inductor Li and the fourth capacitor Cr constitute a resonant circuit to oscillate, thereby outputting an alternating current.
Next, the soft switching state of the inverter switching element Q1 will be described with reference to the operating waveform of the power converter circuit shown in fig. 12.
As shown in fig. 12, the drive signal PWM at the inverting switching element Q1(Q1)When the high level is changed into the low level, the drain-source voltage V of the switching element Q1 is invertedDS(Q1)Slowly rising, ZVS off. Drive signal PWM at inverting switching element Q1(Q1)When the low level is changed into the high level, the drain-source voltage V of the switching element Q1 is invertedDS(Q1)Close to zero, turning on for near ZVS. Therefore, the inverter switching element Q1 realizes a soft switching state, reduces switching loss and electromagnetic interference, further improves the system power conversion efficiency, and is easy to realize electromagnetic compatibility.
< modification of example 2>
Fig. 13 shows a circuit configuration of a power converter circuit according to modification 1 of embodiment 2 of embodiment 1 of the present invention. As shown in fig. 13, the input of the inverter circuit is not a direct current input but an alternating current input with respect to the power converter circuit shown in fig. 11. At this time, the inverter switching element Q1 is a bidirectional switching element, thereby avoiding the use of a full-bridge rectifier diode at the input terminal and reducing the conduction loss of the diode.
Fig. 14 shows a circuit configuration of a power converter circuit according to variation 2 of embodiment 1 of the present invention. In contrast to the power converter circuit shown in fig. 13, in the secondary-side circuit on the output side, the diodes D1 to D4 of the secondary-side rectifying circuit are replaced with switching elements S1 to S4, and a primary DC/DC converter is provided after the secondary-side rectifying circuit, whereby the load voltage or current can be independently adjusted, and the adjustment range can be expanded. The switching elements S1 to S4 may be switching elements formed of devices such as transistors, MOSFETs, and IGBTs.
The above description has been made of the examples of the power converter circuit according to embodiment 1 of the present invention, but the present invention is not limited to these examples. For example, since the power converter circuit can output a constant voltage or a constant current at different operating frequency points, the output load of the secondary-side circuit can be a rechargeable battery. Fig. 15 shows a circuit configuration diagram in the case where the output load is a rechargeable battery. The power converter circuit can charge the rechargeable battery with a constant voltage or a constant current.
Fig. 16 is a schematic circuit diagram showing a power converter circuit according to embodiment 2 of the present invention. Embodiment 2 differs from embodiment 1 only in the position of the first inductor L1.
In the power converter circuit according to 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 according to 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.
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.
Fig. 17 is a schematic circuit diagram showing a power converter circuit according to embodiment 3 of the present invention. Embodiment 3 differs from embodiment 1 only in the position of the second inductor L2.
In the power converter circuit according to 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 according to 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).
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.
Fig. 18 is a schematic circuit diagram showing a power converter circuit according to embodiment 4 of the present invention. Embodiment 4 differs from embodiment 1 only in the positions of the first inductor L1 and the second inductor L2.
In the power converter circuit according to 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 according to 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).
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.
The present invention has been described in detail, but the above embodiments are only examples of all embodiments, and the present invention is not limited thereto. The present invention can be modified within the scope of the present invention for any of the constituent elements of the embodiment.
Claims (25)
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,
the coupling network comprises 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 sequentially connected in series between a first output terminal of the primary-side circuit and a first input terminal of the secondary-side circuit,
one end of the third capacitor is connected to the second output terminal of the primary-side circuit, and the other end is connected to the second input terminal 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 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,
the coupling network comprises 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 in this order between a first output terminal of the primary-side circuit and a first input terminal of the secondary-side circuit,
the first inductor and the third capacitor are connected in series in this order between the second output terminal of the primary-side circuit and the second input terminal of the secondary-side circuit,
one end of the second capacitor is connected to the first output terminal of the primary-side circuit, and the other end is connected to the second input terminal of the secondary-side 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,
the coupling network comprises 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 in this order between a first output terminal of the primary-side circuit and a first input terminal of the secondary-side circuit,
the third capacitor and the second inductor are connected in series in this order between the second output terminal of the primary-side circuit and the second input terminal 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 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,
the coupling network comprises 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 a first output terminal of the primary-side circuit, and the other end is connected to a first input terminal of the secondary-side circuit,
the first inductor, the third capacitor and the second inductor are connected in series in this order between the second output terminal of the primary-side circuit and the second input terminal of the secondary-side circuit,
one end of the second capacitor is connected to the first output terminal of the primary-side 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,
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 of claim 5,
the inductance value of the second inductor is reduced to zero or close to zero.
7. The power converter circuit according to any one of claims 1 to 4,
the coupling network has working frequency points of constant voltage and constant current.
8. The power converter circuit of claim 7,
the output load of the secondary side circuit is a rechargeable battery.
9. The power converter circuit according to any one of claims 1 to 4,
the primary side circuit includes an inverter circuit.
10. The power converter circuit of claim 9,
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.
11. The power converter circuit of claim 9,
the switching frequency of the inverter circuit is close to the resonant frequency of the coupling network.
12. The power converter circuit of claim 11,
the switching frequency of the inverter circuit is adjusted so that the output impedance of the inverter circuit is weakly inductive.
13. The power converter circuit of claim 11,
the switching frequency of the inverter circuit is adjusted so that the output impedance of the inverter circuit is weak capacitive.
14. The power converter circuit of claim 9,
the inverter circuit is a full-bridge inverter circuit including an H-bridge formed by four switching elements.
15. The power converter circuit of claim 9,
the primary side circuit further includes a primary side rectifier circuit disposed before the inverter circuit.
16. The power converter circuit of claim 15,
the primary side rectifying circuit is a full-bridge rectifying circuit including an H-bridge composed of four diodes.
17. The power converter circuit of claim 9,
the inverter circuit includes a third inductor, an inverter switching element, and a fourth capacitor, the third inductor being connected between an input terminal of the inverter circuit and the first output terminal of the primary side circuit, and the inverter switching element and the fourth capacitor being connected in parallel between the first output terminal and the second output terminal of the primary side circuit.
18. The power converter circuit of claim 17,
the inversion switch element is a bidirectional switch element.
19. The power converter circuit according to any one of claims 1 to 4,
the secondary side circuit comprises a secondary side rectifying circuit.
20. The power converter circuit of claim 19,
the secondary side rectifying circuit is a single diode rectifying circuit, a half-bridge rectifying circuit, a full-bridge rectifying circuit or a multi-level smoothing circuit.
21. The power converter circuit of claim 19,
the secondary side rectifying circuit is a full-bridge rectifying circuit comprising an H bridge formed by four diodes.
22. The power converter circuit of claim 19,
the secondary side rectifying circuit is a full-bridge rectifying circuit including an H bridge composed of four switching elements.
23. The power converter circuit of claim 19,
the secondary side circuit further comprises a DC/DC converter arranged behind the secondary side rectifying circuit.
24. The power converter circuit according to any one of claims 1 to 4,
the feedback control circuit generates a feedback signal based on an output signal of the secondary side circuit, converts the feedback signal into a driving signal, and outputs the driving signal to the primary side circuit.
25. The power converter circuit according to any one of claims 1 to 4,
the first capacitor, the second capacitor and the third capacitor are safety capacitors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112701925A (en) * | 2020-12-31 | 2021-04-23 | 开爻科技(上海)有限公司 | Power converter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701925A (en) * | 2020-12-31 | 2021-04-23 | 开爻科技(上海)有限公司 | Power converter circuit |
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