TWI780703B - Four-ports power converter - Google Patents

Abstract

A four-ports power converter are connected to a solar cell, battery, a DC power network and a car-charging port. The four-ports power converter use a bi-directional bridge switching circuit CL³C to be a transformer and a CLLC resonant circuit to solve voltage boosting issue. Two inductors are used to achieve a zero-voltage switching and zero current switching results to reduce the power lose and circuit efficiency.

Description

Four Port Power Converter

The present invention relates to a power converter, and in particular to a four-port power converter, wherein the four ports of the four-port power converter are respectively electrically connected to a solar power source, a battery power source, a DC power grid, and a car charging port.

In recent years, governments and environmental protection groups of various countries have continuously advocated green energy to reduce the greenhouse effect. Therefore, a large number of solar power sources are also deployed everywhere and connected to the DC power grid. However, the power generated by the solar power is unstable due to the influence of the weather. Therefore, at an appropriate moment, the DC power grid needs to switch the power supply from the solar power to the battery power. The DC power grid, the solar power supply and the battery power supply are electrically connected through a power converter, and the above-mentioned switching is realized.

Furthermore, in order to popularize electric vehicles, a large number of charging piles must be arranged everywhere to charge electric vehicles. Therefore, there is a need to provide power supply to the car charging port through a power converter. On the other hand, in order to achieve better power generation by solar power, it is necessary to further control the duty cycle of the switch of the power converter to avoid poor power generation efficiency. To sum up, there is still room for further improvement of the existing power converters.

In order to achieve the above creation purpose, the present invention provides a four-port power converter, including: a bidirectional full-bridge CL ³ C resonant converter, a car charging port, an input capacitor, an output capacitor, a first inductively coupled inductor, a second inductively coupled inductor, An isolation capacitor, a first diode and a second diode; wherein the second and third input/output nodes of the primary side of the bidirectional full-bridge CL ³ C resonant converter communicate with the first inductive coupling inductor through the first inductive coupling inductor The first diode is electrically coupled to a solar power source, the fourth input/output node of the primary side of the bidirectional CL ³ C resonant converter is electrically connected to ground voltage, and the bidirectional CL ³ C resonant converter The first input/output node on the primary side is electrically connected to the input capacitor and the battery power supply, wherein the battery power supply and the input capacitor are connected in parallel with each other; the sixth and second terminals of the bidirectional CL ³ C resonant converter The seventh input/output node is electrically coupled to the car charging port through the second inductive coupling inductor and the second diode, and the isolation capacitor is connected in series with the second diode and the car The ports are connected in parallel, the eighth input/output node of the secondary side of the bidirectional CL ³ C resonant converter is electrically connected to the ground voltage, and the fifth input of the secondary side of the bidirectional CL ³ C resonant converter The /output node is electrically connected to output the capacitor and the DC grid, and the DC grid and the output capacitor are connected in parallel; the input end and the output end of the first diode are respectively electrically connected to the solar power supply and the DC power grid. The first coupling induction inductor, and the input end and output end of the second diode are respectively electrically connected to the second coupling induction inductor and the car charging port. .

Briefly, the embodiment of the present invention provides a four-port power converter, which can be used to switch and convert current paths between battery power, solar power, and a DC grid to a vehicle charging port, so as to realize effective utilization of green energy.

1: Four-port power converter

11: Voltage sensing module

111~114: Voltage sensor

12: Controller

13: Drive circuit

14: Bidirectional full bridge CL ³ C resonant converter

15: Car charging port

Q1~Q8: switch

C1~C8: capacitance

D1~D8: Diodes

D9: The first diode

D10: second diode

V1~V3: Voltage

N1: first input/output node

N2: Second input/output node

N3: The third input/output node

N4: Fourth input/output node

N5: fifth input/output node

N6: sixth input/output node

N7: seventh input/output node

N8: Eighth input/output node

NP, NS: Coil turns

Lr1, Lr2: Resonant inductance

Lm: magnetically excited inductance

Cr1, Cr2: resonant capacitor

CI: isolation capacitance

CIN: input capacitance

COUT: output capacitance

LCOUP1, LCOUP2: Inductively coupled inductors

WC: Coil

201~205, 211~215, 221: curve

S301~S311: steps

Fig. 1 is a circuit diagram of a four-port power converter according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the current-voltage curve and the power-voltage curve of the solar power supply according to the embodiment of the present invention under different illuminance.

FIG. 3 is a flow chart of the maximum power tracking method according to the embodiment of the present invention.

Please refer to Figure 1 of the present invention, which is a circuit diagram of a four-port power converter according to an embodiment of the present invention. An embodiment of the present invention provides a four-port power converter 1, wherein the four ports of the four-port power converter 1 are respectively electrically connected to a solar power source (ie, voltage V2), a battery power source (ie, voltage V1), and a DC power grid. (that is, the voltage V3 ) and the car charging port 15 . The four-port power converter 1 includes a voltage sensing module 11, a controller 12, a drive circuit 13, a bidirectional full-bridge CLLLC (hereinafter referred to as CL ³ C) resonant converter 14, a car charging port 15, an input capacitor CIN, and an output capacitor COUT , the first inductively coupled inductor LCOUP1 , the second inductively coupled inductor LCOUP2 , the isolation capacitor CI, the first diode D9 and the second diode D10 .

The second input/output node N2 and the third input/output node N3 of the primary side of the bidirectional CL ³ C resonant converter 14 are electrically coupled to the solar power source through the first inductive coupling inductor LCOUP1 and the first diode D9, and the bidirectional CL The fourth input/output node N4 on the primary side of the ³ C resonant converter is electrically connected to the ground voltage, and the first input/output node N1 on the primary side of the bidirectional CL ³ C resonant converter is electrically connected to the input capacitor CIN and the battery power supply , where the battery supply and the input capacitor CIN are connected in parallel with each other. The sixth input/output node N6 and the seventh input/output node N7 of the secondary side of the bidirectional CL ³ C resonant converter are electrically coupled to the car charging port 15 through the second inductive coupling inductor LCOUP2 and the second diode D10, The isolation capacitor CI and the second diode D10 in series are connected in parallel with the car charging port 15, the eighth input/output node N8 on the secondary side of the bidirectional CL ³ C resonant converter is electrically connected to the ground voltage, and the bidirectional CL ³ C resonant The fifth input/output node N5 on the secondary side of the converter is electrically connected to the output capacitor COUT and the DC grid, wherein the DC grid and the output capacitor COUT are connected in parallel. The voltage sensing module 11 is electrically connected to the controller 12 and the bidirectional CL ³ C resonant converter 14 , and the driving circuit 13 is electrically connected to the controller 12 and the bidirectional CL ³ C resonant converter 14 . The input end and output end of the first diode D9 are electrically connected to the solar power source and the first coupling inductance LCOUP1 respectively, and the input end and output end of the second diode D10 are respectively electrically connected to the second coupling inductance LCOUP2 and Car charging port 15.

The bidirectional full-bridge CL ³ C resonant converter 14 is used as the conversion stage. This bidirectional CL ³ C resonant converter 14 is like a bidirectional CLLC resonant converter, which can solve the problem that the reverse direction of the bidirectional LLC resonant converter cannot be boosted, and through the first coupling The use of the induction inductor LCOUP1 and the second coupling induction inductor LCOUP2 can simultaneously achieve zero voltage switching of the switch (zero voltage switching) and zero current switching of the rectifier side (zero current switching) in the bidirectional mode operation, so as to reduce power loss and improve the circuit efficiency. The voltages of the second input/output node N2, the seventh input/output N7 and the voltages V1, V2, and V3 of the bidirectional full-bridge CL ³ C resonant converter 14 are sensed by the voltage sensing module 11, and the controller 12 according to the bidirectional full-bridge The voltage of the second input/output node N2 of the CL ³ C resonant converter 14, the voltage on the input end of the second diode D10 and the voltages V1, V2, V3 generate control signals to the driving circuit 13, and the driving circuit 13 generates control signals according to The control signal generates a driving voltage to control the current path of the bidirectional full-bridge CL ³ C resonant converter 14 , so that the four-port power converter 1 can operate in different modes.

Further, the voltage sensing module 11 includes four voltage sensors 111 - 114 . The voltage sensor 111 detects the voltage V1 of the battery power source and the voltage V2 of the solar power source to obtain a voltage difference V2 − V1 between the battery power source and the solar power source, and transmits the voltage difference to the controller 12 . The voltage sensor 112 detects the voltage of the second input/output node N2 and the voltage V2 of the solar power source to obtain a voltage difference between the second input/output node N2 and the solar power source, and transmits the voltage difference to the controller 12 . The voltage sensors 113 and 114 detect the voltage on the input end of the second diode D10 and the voltage V3 of the DC power grid to obtain the voltage difference between the input end of the second diode D10 and the DC power grid, and transmit the voltage difference to the controller 12. The implementation of the voltage sensing module 11 is not intended to limit the present invention. For example, the voltage sensors 113 and 114 can be implemented with the same voltage sensor to reduce the circuit area.

The four-port power converter 1 has a plurality of modes. In the first mode, the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 is disconnected, the DC power grid cannot provide induced current to the battery power supply through the induction coil WC, and there is no current path between the battery power supply and the solar power supply; bidirectional The secondary side of the full-bridge CL ³ C resonant converter 14 is turned on and provides a current path for the DC grid to provide power to the car charging port 15 . Please note here that through the use of the second inductive coupling inductor LCOUP2, in the first mode, the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 will be a step-down current path to meet the charging The voltage specifications of piles.

In the second mode, both the primary side and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 are turned on, and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 provides a DC grid for supplying power to The current path of the car charging port 15 and the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 only provide a current path for the DC power grid to generate an induced current through the induction coil WC to charge the battery power supply, and the solar battery is turned off to provide power the current path. Please note here that through the use of the second inductive coupling inductor LCOUP2, in the second mode, the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 will be a step-down current path to meet the charging The voltage specifications of piles.

In the third mode, both the primary side and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 are turned on, and the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 provides the solar power to charge the battery power. path, and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 only provides the current path for the solar power to generate induced current through the induction coil WC to provide power to the car charging port 15, and closes the current for the DC grid to provide power path. Please note here that through the use of the first inductively coupled inductor LCOUP1 and the second inductively coupled inductor LCOUP2, in the third mode, the current path provided by the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 will be a boost The current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 is a step-down current path to meet the voltage specification of the charging pile.

In the fourth mode, both the primary side and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 are turned on, and the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 does not provide the solar power to charge the battery power. path, but the solar power supply provides a current path for the induced current to the secondary side through the induction coil WC, and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 provides a current path for the induced current to flow to the car charging port 15 , but does not provide a current path for the induced current to flow to the DC grid. Please note here that through the use of the second inductive coupling inductor LCOUP2, in the fourth mode, the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 will be a step-down current path to meet the charging The voltage specifications of piles.

In the fifth mode, both the primary side and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 are turned on, and the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 provides solar power and battery power to the induction coil WC The current path for generating the induced current and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 provide a current path for the induced current to flow to the car charging port 15 , but do not provide a current path for the induced current to flow to the DC power grid. Please note here that through the use of the first inductively coupled inductor LCOUP1 and the second inductively coupled inductor LCOUP2, in the fifth mode, the current path provided by the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 will be a step-up voltage The current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 is a step-down current path to meet the voltage specification of the charging pile.

In the sixth mode, both the primary side and the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 are turned on, and the primary side of the bidirectional full-bridge CL ³ C resonant converter 14 provides solar power to generate an induced current in the induction coil WC The current path of the bidirectional full-bridge CL ³ C resonant converter 14 provides a current path for the induced current to flow to the car charging port 15, but does not provide a current path for the induced current to flow to the DC power grid. Please note here that through the use of the second inductive coupling inductor LCOUP2, in the sixth mode, the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter 14 will be a step-down current path to meet the charging The voltage specifications of piles.

It should be noted that when the duty cycle ratio is greater than 0.5, the controller 12 converts the current between the primary and secondary sides by using the characteristics of the coupled inductor current, so that the switch of the bidirectional full-bridge CL ³ C resonant converter 14 achieves zero-voltage switching effect. Furthermore, through the control of the controller 12, the car charging port 15 has a constant current-constant voltage (CC-CV) charging effect. Even, in the mode of using solar energy power supply (the aforementioned third mode, fourth mode and fifth mode), the controller 12 also executes the maximum power tracking algorithm to control the bidirectional full-bridge CL ³ C resonant converter 14 working cycle. In this way, the solar power source can effectively generate solar power, so that the power generation efficiency is optimized. The details of the algorithm for performing MPPT will be described in detail later, and are omitted here.

Please continue to refer to Figure 1. The bidirectional full-bridge CL ³ C resonant converter 14 includes multiple switches Q1~Q8, multiple diodes D1~D8, multiple capacitors C1~C8, magnetically excited inductor Lm, coil WC, and resonance Capacitors Cr1, Cr2 and resonant inductors Lr1, Lr2. The turns of the primary side and the secondary side of the coil WC are NP and NS respectively, and the switches Q1-Q8 may be NMOS transistors. The magnetically excited inductor Lm is connected in parallel with the primary side of the coil WC, one end of the magnetically excited inductor Lm is electrically connected to the second input/output node N2 through the series resonant capacitor Cr1 and the resonant inductor Lr1, and the other end of the magnetically excited inductor Lm is electrically connected A third input/output node N3.

The first input/output node N1 is electrically connected to the first ends of the switches Q1, Q3, the first ends of the capacitors C1, C3, and the output ends of the diodes D1, D3. The second input/output node N2 is electrically connected to the second end of the switch Q1, the second end of the capacitor C1, the input end of the diode D1, the first end of the switch Q2, the first end of the capacitor C2, and the diode D2 The output terminal of the first coupled inductive inductor LCOUP1 and one terminal of the resonant capacitor Cr1. The third input/output node N3 is electrically connected to the second end of the switch Q3, the second end of the capacitor C3, the input end of the diode D3, the first end of the switch Q4, the first end of the capacitor C4, and the diode D4 The output end of the first coupled inductance LCOUP1 and the other end of the primary side of the coil WC. The fourth input/output node N4 is electrically connected to the second terminals of the switches Q2 and Q4, the second terminals of the capacitors C2 and C4, and the input terminals of the diodes D2 and D4.

The fifth input/output node N5 is electrically connected to the first ends of the switches Q5, Q7, the first ends of the capacitors C5, C7, and the output ends of the diodes D5, D7. The sixth input/output node N6 is electrically connected to the second end of the switch Q5, the second end of the capacitor C5, the input end of the diode D5, the first end of the switch Q6, the first end of the capacitor C6, and the diode D6 The output terminal of the second coupled inductive inductor LCOUP2 and one terminal of the resonant capacitor Cr2. The seventh input/output node N7 is electrically connected to the second terminal of the switch Q7, the second terminal of the capacitor C7, the input terminal of the diode D7, the first terminal of the switch Q8, the first terminal of the capacitor C8, and the diode D8 The output end of the second coupling inductance LCOUP2 and the other end of the secondary side of the coil WC. The fourth input/output node N4 is electrically connected to the second terminals of the switches Q6, Q8, the second terminals of the capacitors C6, C8, and the input terminals of the diodes D6, D8.

Next, please refer to Fig. 2 and Fig. 3, Fig. 2 is a schematic diagram of the current-voltage curve and power-voltage curve of the solar power supply of the embodiment of the present invention under different illuminance, and Fig. 3 is the embodiment of the present invention Flowchart of the maximum power tracking method. In Figure ₂ , under the sunshine intensity _G1 to G5, the current-voltage curves of the solar power supply are curves 201, 202, 204, 205 and 203 respectively, and the power-voltage curves of the solar power supply are curves 211 and 212 respectively , 213, 215 and 215. Therefore, a better tracking curve can be drawn as curve 221 .

According to the above curve 221, the MPPT method is designed as shown in Fig. 3 . In step S301 , the voltage V2 , current I2 and power P2 of the previous solar power supply are read. In step S302, the current voltage V2, current I2 and power P2 of the solar power source are read. In step S303, it is judged whether the power P2 of the current solar power source is greater than the power P2 of the previous solar power source, if yes, execute step S304, otherwise execute step S307. In step S304, it is determined whether the current voltage V2 of the solar power source is greater than the previous voltage V2 of the solar power source, if yes, execute step S306, otherwise execute step S305. In step S307, it is judged whether the power P2 of the current solar power source is smaller than the power P2 of the previous solar power source, if yes, execute step S311, otherwise execute step S310. In step S311, it is determined whether the current voltage V2 of the solar power source is greater than the previous voltage V2 of the solar power source, if yes, execute step S309, otherwise execute step S308. In steps S304 and S309, the duty cycle is increased. In steps S305 and S308, the duty cycle is reduced. In step S310 , measure the voltage V2 , current I2 and power P2 of the new solar power source, and update the current voltage V2 , current I2 and power P2 of the solar power source.

Based on the above, the four-port power converter of the embodiment of the present invention can be used to switch and convert the current path between the battery power source, the solar power source, and the DC grid to the car charging port, so as to realize the effective utilization of green energy. Furthermore, the four-port power converter of the embodiment of the present invention has the advantages of low power loss, good power generation efficiency and simple structure.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of rights claimed by the present invention. All other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in the present invention. within the scope of the patent application.

1: Four-port power converter

11: Voltage sensing module

111~114: Voltage sensor

12: Controller

13: Drive circuit

14: Bidirectional full bridge CL ³ C resonant converter

15: Car charging port

Q1~Q8: switch

C1~C8: capacitance

D1~D8: Diodes

D9: The first diode

D10: second diode

V1~V3: Voltage

N1: first input/output node

N2: Second input/output node

N3: The third input/output node

N4: Fourth input/output node

N5: fifth input/output node

N6: sixth input/output node

N7: seventh input/output node

N8: Eighth input/output node

NP, NS: Coil turns

Lr1, Lr2: Resonant inductance

Lm: magnetically excited inductance

Cr1, Cr2: resonant capacitor

CI: isolation capacitance

CIN: input capacitance

COUT: output capacitance

WC: Coil

LCOUP1: The first inductively coupled inductor

LCOUP2: The second inductive coupling inductor

Claims (10)

A four-port power converter, including: a bidirectional full-bridge CL ³ C resonant converter, a car charging port, an input capacitor, an output capacitor, a first inductively coupled inductor, a second inductively coupled inductor, an isolation capacitor, a first diode and second diode; wherein the second and third input/output nodes of the primary side of the bidirectional full-bridge CL ³ C resonant converter are electrically coupled to the first diode through the first inductive coupling inductor connected to a solar power source, the fourth input/output node on the primary side of the bidirectional CL ³ C resonant converter is electrically connected to ground voltage, and the first input/output node on the primary side of the bidirectional CL ³ C resonant converter electrically connecting the input capacitor and a battery power source, wherein the battery power source and the input capacitor are connected in parallel; the sixth and seventh input/output nodes of the secondary side of the bidirectional CL ³ C resonant converter pass through the The second inductive coupling inductor and the second diode are electrically coupled to the car charging port, the isolation capacitor and the second diode in series are connected in parallel with the car charging port, and the bidirectional CL ³ The eighth input/output node on the secondary side of the C resonant converter is electrically connected to the ground voltage, and the fifth input/output node on the secondary side of the bidirectional CL ³ C resonant converter is electrically connected to output the A capacitor and a DC grid, the DC grid and the output capacitor are connected in parallel; the input end and the output end of the first diode are respectively electrically connected to the solar power supply and the first coupling induction inductor, and the The input end and the output end of the second diode are electrically connected to the second coupling inductance and the car charging port respectively. The four-port power converter as described in claim 1 further includes: a voltage sensing module, a controller, and a driving circuit; wherein the voltage sensing module is used to sense multiple voltages of the four-port power converter, And make the controller generate multiple control signals to control the drive circuit to generate multiple drive voltages for driving multiple switches of the bidirectional full-bridge CL ³ C resonant converter. The four-port power converter as claimed in claim 2, wherein the controller further executes a maximum power tracking algorithm to control the duty cycle of the bidirectional full-bridge CL ³ C resonant converter. The four-port power converter as described in claim 3, wherein in the first mode, the primary side of the bidirectional full bridge CL ³ C resonant converter is disconnected, and the DC grid cannot pass through the bidirectional full bridge CL ³ The induction coil of the C resonant converter provides an induced current to the battery power supply, and there is no current path between the battery power supply and the solar power supply; the secondary measurement of the bidirectional full-bridge CL ³ C resonant converter is is turned on, and provides the current path of the DC power grid for providing power to the car charging port, wherein through the action of the second inductively coupled inductor, the secondary of the bidirectional full-bridge CL ³ C resonant converter The current path provided by the side is a step-down current path. The four-port power converter as described in claim 3, wherein in the second mode, both the primary side and the secondary side of the bidirectional full bridge CL ³ C resonant converter are turned on, and the bidirectional full bridge CL ³ C The secondary side of the resonant converter provides a current path for the DC grid to provide power to the car charging port, and the primary side of the bidirectional full bridge CL ³ C resonant converter only provides the DC grid through The induction coil of the bidirectional full-bridge CL ³ C resonant converter generates an induced current to charge the battery power supply, and closes the current path for the solar battery to provide power, wherein the second inductive coupling inductor The function of the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter is a step-down current path. The four-port power converter as described in claim 3, wherein in the third mode, both the primary side and the secondary side of the bidirectional full bridge CL ³ C resonant converter are turned on, and the bidirectional full bridge CL ³ C The primary side of the resonant converter provides the current path for the solar power to charge the battery power, and the secondary side of the bidirectional full bridge CL ³ C resonant converter only provides the solar power through the bidirectional full bridge. The induction coil of the bridge CL ³ C resonant converter generates an induction current to provide power to the current path of the car charging port, and closes the current path of the DC grid to provide power, wherein through the first and second inductive coupling The role of the inductance, the current path provided by the primary side of the bidirectional full bridge CL ³ C resonant converter is a boosted current path, the current path provided by the secondary side of the bidirectional full bridge CL ³ C resonant converter is a step-down current path. The four-port power converter as described in claim 3, wherein in the fourth mode, both the primary side and the secondary side of the bidirectional full bridge CL ³ C resonant converter are turned on, and the bidirectional full bridge CL ³ C The primary side of the resonant converter does not provide a current path for the solar power to charge the battery power, but the solar power provides an induced current through the induction coil WC of the bidirectional full-bridge CL ³ C resonant converter. The current path to the secondary side, and the secondary side of the bidirectional full bridge CL ³ C resonant converter provides a current path for the induced current to flow to the car charging port, but does not provide a current path for the induced current to flow to the charging port. In the current path of the DC power grid, through the action of the second inductively coupled inductor, the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter is a step-down current path. The four-port power converter as described in claim 3, wherein in the fifth mode, both the primary side and the secondary side of the bidirectional full bridge CL ³ C resonant converter are turned on, and the bidirectional full bridge CL ³ C The primary side of the resonant converter provides a current path for the solar power source and the battery power source to generate an induced current in the induction coil of the bidirectional full bridge CL ³ C resonant converter, and the bidirectional full bridge CL ³ C resonant converter The secondary side provides a current path for the induced current to flow to the car charging port, but does not provide a current path for the induced current to flow to the DC grid, wherein the first and second inductive coupling inductors function, the current path provided by the primary side of the bidirectional full-bridge CL ³ C resonant converter is a boosted current path, and the current path provided by the secondary side of the bidirectional full-bridge CL ³ C resonant converter is a step-down current path. The four-port power converter as described in claim 3, wherein in the sixth mode, both the primary side and the secondary side of the bidirectional full bridge CL ³ C resonant converter are turned on, and the bidirectional full bridge CL ³ C The primary side of the resonant converter provides a current path for the solar power source to generate an induced current in the induction coil, and the secondary side of the bidirectional full-bridge CL ³ C resonant converter provides the induced current to flow to the vehicle The current path of the charging port, but does not provide the current path for the induced current to flow to the DC grid, wherein through the effect of the second inductively coupled inductor, the secondary side of the bidirectional full-bridge CL ³ C resonant converter The current path provided is a step-down current path. The four-port power converter as described in claim 2, wherein the current power of the solar power source is not equal to the power of the previous solar power source, increasing or decreasing the power of the bidirectional full-bridge CL ³ C resonant converter Working period.

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