TW201503561A - Interleaving DC-DC converter and reversible multiple-input interleaving DC-DC converter - Google Patents

Abstract

The present disclosure provides an interleaving DC-DC converter and a reversible multiple-input interleaving DC-DC converter for providing electrical power through the DC-bus to the load. The reversible multiple-input interleaving DC-DC converter comprises at least a first interleaving boost converter, at least a second interleaving boost converter and a control circuit. The power terminals of the first interleaving boost converter and the second interleaving boost converter receive the first power source and the second power source respectively. The output terminals of the first interleaving boost converter and the second interleaving boost converter are coupled to the DC-bus. The control circuit controls the switches of the first interleaving boost converter and the second interleaving boost converter, such that the switches operate in the zero voltage switching mode and the inductors of the first interleaving boost converter and the second interleaving boost converter operate in the synchronous conduction mode.

Description

Interleaved DC/DC converters and reversible multi-input interleaved DC/DC converters

The present invention relates to a DC/DC converter, and more particularly to an interleaved DC/DC converter for a DC/DC converter and a reversible multi-input interleaved DC/DC converter.

Because green energy (such as fuel cells, solar cells, etc.) has DC low-voltage power generation characteristics, and related technologies such as power electronics and automatic control, it can be widely used in decentralized energy sources. In general, green energy cannot be directly applied to general electrical products, so the DC/DC power converter developed by the power electronics field is an indispensable power device for applying green energy. Generally, the voltage of a fuel cell is susceptible to the load required and the transient response is slow, and the high power cannot be instantaneously outputted. Therefore, an auxiliary energy storage facility (such as a battery, a super capacitor, etc.) is an indispensable component. Usually, a group of power supply devices are equipped with a set of power converters for converting various energy sources of different power generation characteristics, but this method is easy to cause an increase in cost and relatively complicated control.

The application of the boost power converter is the most widely used in the traditional single-inductive power converter. It can control the output voltage boost ratio by adjusting the duty cycle of the switch, but its most disadvantage is that the switch is switched to the traditional hard switching mode. And the output diode has a reverse recovery current problem. When the power semiconductor switch is turned on, the diode must generate a reverse bias voltage with a large instantaneous current. This current flows through the power semiconductor switch, which may cause switching loss and Has a low conversion efficiency.

Embodiments of the present invention provide an interleaved DC/DC converter and a reversible multi-input interleaved DC/DC converter with high efficiency of a split-phase switching mechanism and a reversible multi-input feature by parallel connection. By controlling multiple input power sources simultaneously and ensuring bidirectional energy transfer, it is possible to reduce input current ripple and improve power conversion efficiency.

Embodiments of the present invention provide an interleaved DC/DC converter for supplying power to a load through a DC bus, the interleaved DC/DC converter including a first interleaved boost circuit and a control circuit. The first interleaved booster circuit has a first power supply end and a first output end, the first power supply end receives the first power supply, the first output end is coupled to the DC bus, and the first interleaved boost circuit includes a coupling a first inductor coupled to the first inductor, a first switch coupled between the first inductor and the ground, a second switch coupled between the first inductor and the first output, and a second inductor coupled to the first input And a third switch coupled between the second inductor and the ground, and a fourth switch coupled between the second inductor and the first output. The control circuit is coupled to the control ends of the first switch, the second switch, the third switch and the fourth switch, and drives the first switch, the second switch, the third switch and the fourth switch to be turned on and off. The first switch, the second switch, the third switch and the fourth switch operate in a Zero Voltage Switching (ZVS) mode, and the first inductor and the second inductor operate in a Synchronous Conduction Mode (SCM).

Embodiments of the present invention provide a reversible multi-input interleaved DC/DC converter for providing power to a load through a DC bus. The reversible multi-input interleaved DC/DC converter includes at least a first interleaved boost circuit, at least a second interleaved boost circuit, and a control circuit. The first interleaved boosting circuit has a first power terminal and a first output terminal. The first power terminal receives the first power source, and the first output terminal is coupled to the DC bus bar. The first interleaved boosting circuit includes a first inductor coupled to the first input, a first switch coupled between the first inductor and the ground, and a first coupling between the first inductor and the first output a second switch coupled to the second inductor of the first input and coupled to The third switch between the second inductor and the ground is coupled to the fourth switch between the second inductor and the first output. The second interleaved boosting circuit has a second power terminal and a second output terminal, the second power terminal receives the second power source, and the second output terminal is coupled to the DC bus bar. The second interleaved boosting circuit includes a third inductor coupled to the second input, a fifth switch coupled between the third inductor and the ground, and a third coupled between the third inductor and the second output A sixth switch, a fourth inductor coupled to the second input, a seventh switch coupled between the fourth inductor and the ground, and an eighth switch coupled between the fourth inductor and the second output. The control circuit is coupled to the control ends of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch, and drives the first switch, the second switch, and the The three switches, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch are turned on and off. The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch operate in a zero voltage conduction mode. The first inductor, the second inductor, the third inductor, and the fourth inductor operate in a synchronous conduction mode.

In summary, the embodiments of the present invention provide a reversible multi-input interleaved power converter that can operate on a single input, multiple input or dual input power supply and bidirectional buck-boost, and the switch operates in a zero voltage conduction mode, the diode Replaced by the power switch, the input current ripple is effectively reduced in a symmetrical architecture.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

1‧‧‧Reversible Multi-Input Interleaved DC/DC Converter

101‧‧‧High-voltage DC busbar

11‧‧‧First interleaved boost circuit

12‧‧‧Second interleaved booster circuit

13‧‧‧Control circuit

11a‧‧‧First power terminal

V ₁ ‧‧‧First power supply

11b‧‧‧ first output

12a‧‧‧second power terminal

V ₂ ‧‧‧second power supply

12b‧‧‧second output

L _a ‧‧‧first inductance

L _b ‧‧‧second inductance

L _c ‧‧‧third inductance

L _d ‧‧‧ fourth inductance

S _ad ‧‧‧first switch

S _au ‧‧‧second switch

S _bd ‧‧‧third switch

S _bu ‧‧‧fourth switch

S _cd ‧‧‧ fifth switch

S _cu ‧‧‧ sixth switch

S _dd ‧‧‧ seventh switch

S _du ‧‧‧eighth switch

T _ad , T _au , T _bd , T _bu , T _cd , T _cu , T _dd , T _du , T _p1 , T _p2 ‧‧‧ drive signals

S _p1 ‧‧‧First power switch

S _p2 ‧‧‧second power switch

Vo‧‧‧ output voltage

Ro‧‧‧ load

C ₁ , C ₂ , Co‧‧‧ capacitors

GND‧‧‧ ground terminal

I ₁ , I ₂ , i _La , i _Lb , i _Lc , i _Ld , i _Sad , i _Sau , i _Sbd , i _Sbu , i _Scd , i _Scu , i _Sdd , i _{Sdu ‧ ‧} current

V _Sad , V _Sau , V _Sbd , V _Sbu , V _Scd , V _Scu , V _Sdd , V _Sdu ‧‧‧ voltage

t ₀ , t ₁ , t ₂ , t ₃ , t ₄ , t ₅ , t ₆ , t ₇ , t ₈ , t ₉ , t ₁₀ , t ₁₁ , t ₁₂ , t ₁₃ , t ₁₄ , t ₁₅ , t ₁₆ , t ₁₇ ‧ ‧ hours

T _S ‧‧‧Switch cycle time

d ₁ , d ₂ , d ₃ , d ₄ , d _d ‧ ‧ responsibility cycle

FIG. 1 is a circuit diagram of a reversible multi-input interleaved DC/DC converter according to an embodiment of the present invention.

2 is a waveform diagram of voltage and current timing of an independent power supply state of a single input power supply according to an embodiment of the present invention.

FIG. 3 is a voltage diagram of a dual-input power supply combined power supply state according to an embodiment of the present invention Current timing waveform diagram.

FIG. 4 is a waveform diagram of voltage and current timing of a reverse voltage buck energy storage state of a high voltage DC bus bar according to an embodiment of the present invention.

FIG. 5 is a graph showing the efficiency of a reversible multi-input interleaved DC/DC converter according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of input currents of a reversible multi-input interleaved DC/DC converter and a conventional boost converter according to an embodiment of the present invention.

[Interlaced DC/DC converter and reversible multi-input interleaved DC/DC converter embodiment]

Referring to FIG. 1, all the inductive operation of the reversible multi-input interleaved DC/DC converter of the present invention is in Synchronous Conduction Mode (SCM) mode, and its architecture is as shown in FIG. 1. The advantages of the circuit architecture are shown in FIG. In order to operate all the switches in the circuit in Zero Voltage Switching (ZVS) mode, the characteristics of flexible switching can be achieved and the switching loss can be reduced. When applied to a reversible solid oxide fuel cell and a battery whose input power source is a low voltage and a high current, the converter can reduce the conduction loss in a split-phase circuit architecture to further improve the efficiency. It is worth mentioning that the circuit of Fig. 1 is exemplified by a two-input converter to help illustrate, but the invention is not limited thereto. The example of the dual input converter of this embodiment can be extended to a three-input, four-input or multiple-input converter. In addition, when operating as an interleaved DC/DC converter of a single input power supply, the control circuit 13 controls the output power of the first interleaved boosting circuit 11 to the DC busbar 101, and the interleaved DC/DC conversion of the single input power supply at this time. The device also provides voltage flexible switching and inductive synchronous conduction to achieve high conversion efficiency. The synchronous conduction mode of the inductor is when the current of the inductor is discharged, the current is decremented to below zero and the discharge continues.

1, reversible interleaved multi-input DC / DC converter 1 for registration through the high voltage DC bus 101 provides power to the load R _o multiplexed reference to FIG. The reversible multi-input interleaved DC/DC converter 1 includes at least a first interleaved boost circuit 11, at least a second interleaved boost circuit 12 and a control circuit 13. A first interleaved boost circuit 11 has a first supply terminal 11a and a first output terminal 11b, a first supply terminal 11a receives a first power source V _1, a first output terminal 11b coupled to the DC bus 101. A first interleaved boost circuit 11 includes a first power terminal 11a is coupled to a first inductor L _a, coupled to the first switch S _ad L _a between the first inductor and the ground terminal GND, coupled to the first _a second switch S _au between the inductor L _a and the first output terminal 11 _b , a second inductor L _b coupled to the first power terminal 11 a , and a third switch coupled between the second inductor L _b and the ground GND S _{bd is} coupled to the fourth switch S _bu between the second inductor L _b and the first output end 11 b .

The second interleaved boost circuit 12 has a second power supply terminal 12a and a second output terminal 12b, a second power supply terminal 12a receives the second power supply V _2, a second output terminal 12b is coupled to the DC bus 101. The second interleaved boosting circuit 12 includes a third inductor L _c coupled to the second power terminal 12 a , a fifth switch S _cd coupled between the third inductor L _c and the ground GND , and coupled to the third a sixth switch S _cu between the inductor L _c and the second output terminal 12 _b , a fourth inductor L _d coupled to the second power terminal 12 a , and a seventh switch coupled between the fourth inductor L _d and the ground GND S _{dd is} coupled to the eighth switch S _du between the fourth inductor L _d and the second output terminal 12 _b .

The control circuit 13 is coupled to the first switch S _ad , the second switch S _au , the third switch S _bd , the fourth switch S _bu , the fifth switch S _cd , the sixth switch S _cu , the seventh switch S _dd and the eighth switch The control terminals of S _du (corresponding to the drive signals T _ad , T _au , T _bd , T _bu , T _cd , T _cu , T _dd , T _{du respectively} ), and drive the on and off of the above switches. The above switches operate in a zero voltage conduction mode. The first inductor L _a, the second inductor L _b, L _c of the third inductor and the fourth inductor L _d conduction mode operation in synchronization.

The reversible multi-input interleaved DC/DC converter 1 realizes the switching voltage by switching the energy stored in the inductor through the switch to the load Ro by operating the above-mentioned inductor in the synchronous conduction mode, and using the negative current characteristic when the inductor is synchronously turned on. Flexible switching and the purpose of circuit boosting. The output circuit of the DC bus bar 101 is composed of an output capacitor Co and an output load Ro, wherein the voltage on the output capacitor Co is a high voltage level DC bus 101 voltage Vo. The first power switch S _p1 and the second power switch S _{p2 may} connect or disconnect the first power source V ₁ or the second power source V ₂ .

The reversible dual-input interleaved DC/DC converter of the embodiment of the present invention can operate in four states, (1) a single input power supply independent power supply state, that is, the control circuit 13 controls the first interleaved boost circuit 11 or the second The interleaved booster circuit 12 is independently powered to the DC busbar 101. (2) The dual-input power supply combined power supply state, that is, when both the first interleaved booster circuit 11 and the second interleaved booster circuit 12 output power, the control circuit 13 controls the first interleaved booster circuit 11 and The second interleaved boost circuit 12 is powered to the DC bus bar 101. (3) The reverse voltage bucking energy storage state of the high voltage DC bus bar, that is, the first power source V ₁ coupled to the first interleaved boost circuit 11 and coupled to the second interleaved boost circuit 12 by the DC bus bar 101 At least one of the second power sources V ₂ is charged. (4) The dual power supply reverse energy storage state, that is, the first interleaved boost circuit 11 charges the second power supply V ₂ coupled to the second interleaved boost circuit 12, or the second interleaved boost circuit 12 The first power source V ₁ coupled to the first interleaved boost circuit 11 is charged.

First, it is worth noting that the first switch S _ad , the second switch S _au , the third switch S _bd , the fourth switch S _bu , the fifth switch S _cd , the sixth switch S _cu , the seventh switch S _{dd ,} and the The eight switch S _du has a body diode. The first switch S _ad conduction state S _au second switches complementary, and the first switch and the second switch S _ad S _au turned on / off with a dead time (Dead Time). Likewise, the third switch and the fourth switch S _bd conductive state S _bu is complementary, and the third switch and the fourth switch S _bd S _bu turned on / off with a dead time. Fifth switch S _cd conduction state S _cu complementary sixth switch and the fifth switch and the sixth switch S _cd S _cu is turned on / off with a dead time. Seventh switch S _dd conduction state S _du complementary to the eighth switch and the seventh switch and the eighth switch S _dd S _du turned on / off with a dead time. The dead time is designed to ensure that the complementary two switches are not turned on at the same time, and that the corresponding inductor energy has sufficient time to flow through the parasitic diode of the switch.

(1) Single-input power supply independent power supply state: This state is an interleaved DC/DC converter of a single input power source, and the control circuit 13 controls the output power of the first interleaved booster circuit 11 to the DC bus bar 101. Please refer to FIG. 2. FIG. 2 is a waveform diagram of voltage and current timing of an independent power supply state of a single input power supply according to an embodiment of the present invention. When the power management is to adjust the output power, energy storage or power supply, or save energy, if the second power supply V _{2 is} not to output power, the second power switch S _p2 may be cut off to complete the power cut-off. The voltage and current timing waveform of the independent power supply state of the first power source V _{1 is} as shown in FIG. 2 . Here, the duty cycle (Tty Cycle) of the switch switching cycle time T _S , the first switch S _ad and the third switch S _bd is d ₁ , the duty cycle of the second switch S _au and the fourth switch S _bu is d ₂ , And the duty cycle of the dead time is d _d .

Mode one [t ₀ -t ₁ ]: before time t=t ₀ , the parasitic diode of the first switch S _ad is continuously turned on by the first inductor L _a , and when t=t ₀ , the first switch S _{ad is} zero The voltage is turned on, at which time the first switch S _ad current is negative, and the first power source V ₁ charges the second inductor L _b . Mode 2 [t ₁ -t ₂ ]: When time t=t ₁ , the third switch S _{bd is turned} off, the second inductor current i _Lb continues to flow and flows through the parasitic diode of the fourth switch S _bu to the output load Ro Power supply, the first switch S _ad current is gradually increased from negative to positive. Mode three [t ₂ -t ₃ ]: when the time t=t ₂ , the fourth switch current i _{Sbu is} still negative, and the fourth switch S _bu is turned on by the parasitic diode of the fourth switch S _bu The first power source V ₁ continues to charge the first inductor L _a . Mode 4 [t ₃ -t ₄ ]: When time t=t ₃ , the first power source V ₁ continues to charge the first inductor L _a , at which time the second inductor L _b operates in the synchronous conduction mode, and the second inductor current i _Lb Decrease to below zero and continue to discharge, the fourth switching current i _{Sbu turns} from negative to positive. Mode 5 [t ₄ -t ₅ ]: When the time t=t ₄ , the fourth switch S _{bu is} turned off, at which time the second inductor L _b continues to flow and flows through the third switch S _bd parasitic diode, the first power source V ₁ continues to charge the first inductance L _a . Mode six [t ₅ -t ₆ ]: when the time t=t ₅ , the parasitic diode of the third switch S _bd is turned on, the third switch S _bd is turned on, and the second inductor L _b is The current i _{Lb is} still negative, and the first power source V ₁ continues to charge the first inductor L _a . Mode seven [t ₆ -t ₇ ]: When time t=t ₆ , the first switch S _ad is turned off, the first inductor L _a energy is freewheeling and flows through the parasitic diode of the second switch S _au for the output load When the power is supplied, the current of the third switch S _bd is gradually increased from negative to positive. Mode VIII [t ₇ -t ₈ ]: When time t=t ₇ , the second switch current i _{Sau is} still negative, and the second switch S _au is turned on by the second switch S _au The first power source V ₁ continues to charge the second inductor L _b . Mode nine [t ₈ -t _9]: when the time t = t _8, the first power source V ₁ to the second continuous charging inductor L _b, L _a case, the first inductance in the synchronous operation mode is turned on, a first inductor current i _La Decrease to below zero and continue to discharge, the second switching current i _{Sau changes} from negative to positive. Mode ten [t ₉ -t ₁₀ ]: When time t=t ₉ , the second switch S _{au is} cut off, at which time the first inductor L _a continues to flow and flows through the parasitic diode of the first switch S _ad , the first power source V ₁ continues to charge the second inductor L _b to complete one cycle of operation.

(2) Dual-input power supply combined power supply state: Please refer to FIG. 3, which is a waveform diagram of voltage and current timing of the dual-input power supply combined power supply state according to an embodiment of the present invention. The first power source V ₁ and the second power source V _{2 are} jointly powered, and it is assumed that the current I _{1 of the} first power source is greater than the current I _{2 of the} second power source. Defined switching cycle time T _S, the duty cycle of the first switch and the third switch S _ad the S _bd d _1, the duty cycle of the second switch and the fourth switch S _au S _bu of d _2, the fifth and the seventh switch S _cd S _dd switch duty cycle d _3, the sixth and the eighth switch S _cu switch S _du duty cycle d _4, and the duty cycle of the dead time _d d.

Mode one [t ₀ -t ₁ ]: before time t=t ₀ , the first switch S _ad zero voltage is turned on, when time t=t ₀ , the first switch S _ad current is negative, the first power source V ₁ is second The inductor L _{b is} charged, the fourth inductor L _d of the second interleaved boost circuit 12 (hereinafter referred to as the second power supply circuit 12 ) supplies power to the load Ro, and the second power source V ₂ charges the third inductor L _c . Mode 2 [t ₁ -t ₂ ]: When time t=t ₁ , the first switch S _ad current is negative, the first power source V ₁ continues to charge the second inductor L _b , and the fourth inductor L _d operates in the synchronous conduction mode The fourth inductor current i _{Ld is} decremented below zero and continues to discharge, and the second power source V ₂ continues to charge the third inductor L _c . Mode three [t ₂ -t ₃ ]: When time t=t ₂ , the second switch S _{bd is turned} off, the second inductor current i _Lb continues to flow and flows through the parasitic diode of the fourth switch S _bu to supply the load Ro The first switch S _ad current is gradually increased from negative to positive. In the second power supply circuit 12, the eighth switch S _{du is turned} off, and the fourth inductor L _d continues to flow and flows through the parasitic diode of the seventh switch S _dd . The second power source V ₂ continues to charge the third inductor L _c . Mode 4 [t ₃ -t _4]: when the time t = t _3, the current of the fourth switch S _{bu i} Sbu still negative, the fourth switch S _bu parasitic diode conducting case, the fourth switch S _bu When the zero voltage is turned on, the first power source V ₁ starts to charge the first inductor L _a , and in the case where the parasitic diode of the second power source circuit 12 and the seventh switch S _dd is turned on, the seventh switch S _dd is turned on, and the voltage is turned on. The second power source V ₂ continues to charge the third inductor L _c . Mode 5 [t ₄ -t ₅ ]: When time t=t ₄ , the second inductor L _{b is} operated in the synchronous conduction mode, the second inductor current i _{Lb is} decremented to below zero and continues to discharge, and the first power source V ₁ continues The first inductor L _{a is} charged, the current i _{Sbu of the} fourth switch S _bu is _turned from negative to positive, the second power source V ₂ continues to charge the third inductor L _c , and the eighth switch S _dd current is still negative. Mode six [t ₅ -t ₆ ]: when time t=t ₅ , the first power source V ₁ continues to charge the first inductor L _a , the fourth switch S _{bu is turned} off, and the second inductor L _b continues to flow and flows through the third The parasitic diode of the switch S _bd , the second power source V ₂ continues to charge the third inductor L _c , and the eighth switch S _dd current is gradually increased from negative to positive. Mode VII [t ₆ -t ₇ ]: When time t=t ₆ , the first power source V ₁ continues to charge the first inductor L _a , and the third switch S _bd turns on the parasitic diode, the third switch S _bd zero voltage is turned on, at this time, the second inductor current i _{Lb is} still negative, the fifth switch S _{cd of the} second power circuit 12 is turned off, and the third inductor L _c energy continues to flow and flows through the parasitic two of the sixth switch S _cu In the polar body, the second power source V ₂ continues to charge the fourth inductor L _d . Mode VIII [t ₇ -t ₈ ]: When time t=t ₇ , the first power source V ₁ continues to charge the first inductor L _a , the second inductor current i _{Lb is} still negative, and the sixth power source circuit 12 is sixth The switch S _cu turns on the sixth switch S _cu zero voltage when the diode is turned on, the third inductor L _c energy continues to flow and continuously supplies power to the load Ro, and the second power source V ₂ continues to charge the fourth inductor L _d . Mode IX [t ₈ -t ₉ ]: When time t=t ₈ , the first power source V ₁ continues to charge the first inductor L _a , the second inductor current i _{Lb is} still negative, and the third power source circuit 12 is third The inductor L _c operates in a synchronous conduction mode, the third inductor current i _{Lc is} decremented to below zero and continues to discharge, and the second power source V2 continues to charge the fourth inductor L _d . Mode ten [t ₉ -t _10]: When the time t = t _9, the first switch S _ad is turned off, the first inductor L _a freewheeling and energy flowing through the second switch S _au parasitic diode, to the output load Ro power supply, the second inductor L _b sustain discharge, a third power supply circuit 12 of the second inductor L _c sustain discharge, a second power source V ₂ to the fourth inductor L _d continued charging. Mode eleven [t ₁₀ -t _11]: When the time t = t _10, the first inductor L _a parasitic diode with energy via a second switch S _au, the power of the output load Ro, a current from the third switch S _bd The negative increasing is positive, the sixth switch S _{cu of the} second power circuit 12 is _turned off, the third inductor L _c energy continues to flow and flows through the parasitic diode of the fifth switch S _cd , and the second power source V ₂ continues to the fourth The inductor L _{d is} charged. Mode twelve [t ₁₁ -t ₁₂ ]: when the time t=t ₁₁ , the second switch current i _{Sau is} still negative, and the second switch S _{au is} zero when the parasitic diode of the second switch S _au is turned on The voltage is turned on, the first power source V ₁ continues to charge the second inductor L _b , and the fifth switch S _{cd of the} second power circuit 12 turns on the fifth switch S _cd zero voltage in the case of parasitic diode conduction, the second power source V ₂ continues to charge the fourth inductor L _d . Mode thirteen [t ₁₂ -t _13]: When the time t = _12, the duration of the second charging inductor L _b, L _a case, the first inductance in the synchronous operation mode is turned on, a first inductor a first current supply V ₁ t i _{La is} decremented to below zero and continues to discharge, the second switching current i _Sau is turned from negative to positive, the current of the fifth switch S _cd of the second power supply circuit 12 is still negative, and the second power supply V ₂ continues to the fourth inductance L _d charging. Mode fourteen [t ₁₃ -t _14]: When the time t = t _13, the first inductor L _a sustain discharge, a first power source V ₁ continued to charge the second inductor L _b, second power supply circuit 12 of the eighth switch S _{dd is turned} off, the fourth inductor L _{d is} inductive energy and flows through the parasitic diode of the eighth switch S _du to supply power to the output load, and the current of the fifth switch S _cd is still negative. Mode fifteen [t ₁₄ -t ₁₅ ]: When time t=t ₁₄ , the second switch S _au is turned off, at which time the first inductor L _a continues to flow and flows through the parasitic diode of the first switch S _ad , A power source V ₁ continuously charges the second inductor L _b , and in the case where the parasitic diode of the eighth switch S _du is turned on, the eighth switch S _du is turned on, and the fifth switch current i _Scd is also turned from negative to positive. The second power source V ₂ continuously charges the third inductor L _c to complete one cycle of operation.

(III) Reverse Voltage Bucking Energy Storage State of High Voltage DC Bus Bars: Please refer to FIG. 4 , which is a waveform diagram of voltage and current timing of a reverse voltage buck energy storage state of a high voltage DC bus bar according to an embodiment of the present invention. The DC bus bar 101 reversely decompresses the energy storage state of the first power source V ₁ and the second power source V ₂ . When the DC bus bar 101 has sufficient and excess energy, the circuit can be reversely stepped down by the DC bus bar 101 to the first interlace. The booster circuit 11 (hereinafter referred to as the first power supply circuit 11) and the second power supply circuit 12 perform energy storage. Defined switching cycle time T _s, the duty cycle of the second switch and the fourth switch S _au S _bu of d _1, the duty cycle of the first switch and the third switch S _ad S _bd of d _2, the sixth and the eighth switch S _cu duty cycle of the switch S _du d _3, the fifth switch and the seventh switch S _cd S _dd duty cycle and the dead time d ₄ the duty cycle _d d.

Mode one [t ₀ -t ₁ ]: before time t=t ₀ , the parasitic diode of the second switch S _au is turned on, when t=t ₀ , the second switch S _au is turned on by zero voltage, and the second inductor L _b Sustained discharge, the fourth inductance L _d of the second power supply circuit 12 charges the second power source V ₂ , and the third inductor L _c continues to discharge. Mode 2 [t ₁ -t ₂ ]: When the time t=t ₁ , the second switching current i _Sau current increases to above zero, the DC bus bar 101 charges the first inductor L _a while charging the first power source V ₁ , The second inductor L _{b is} continuously discharged, the fourth inductor L _d of the second power supply circuit 12 charges the second power source V ₂ , and the third inductor L _c continues to discharge. Mode three [t ₂ -t ₃ ]: when time t=t ₂ , the second switch S _{au is} cut off, the first inductor L _a energy continues to flow and flows through the parasitic diode of the first switch S _ad while the first inductor L _a continues to charge the first power source V ₁ , the second inductor L _b continues to discharge, the fourth inductor L _d of the second power source circuit 12 charges the second power source V ₂ , and the third inductor L _c continues to discharge. Mode 4 [t ₃ -t _4]: when the time t = t3, the first switch S _ad parasitic diode conducting case, the first switch S _ad zero voltage, the first inductor L _a continuous power supply to the first V _{1 is} charged, the second inductor L _{b is} continuously discharged, the fifth switch S _{cd of the} second power circuit 12 is _turned off, the third inductor L _c energy continues to flow and flows through the parasitic diode of the sixth switch S _cu , the fourth inductor L _d operates in the synchronous conduction mode, and the fourth inductor current i _{Ld is} incremented above zero and continues to discharge. Mode 5 [t ₄ -t ₅ ]: When time t=t ₄ , the first inductor L _a continues to charge the first power source V ₁ , the second inductor L _b continues to discharge, and the sixth switch S _{cu of the} second power source circuit 12 In the case where the parasitic diode is turned on, the sixth switch S _cu is turned on at zero voltage, and the fourth inductor L _{d is} continuously discharged. Mode six [t ₅ -t ₆ ]: When time t=t ₅ , the first inductor L _a continues to charge the first power source V ₁ , and the second inductor L _b continues to discharge, in the second power source circuit 12 , the sixth switch S _When the current i _Scu current of _cu is increased to above zero, the DC bus bar 101 starts to store energy to the third inductor L _c and simultaneously charges the second power source V ₂ , and the fourth inductor L _d continues to discharge. Mode VII [t ₆ -t ₇ ]: When time t=t ₆ , the first inductor L _a continues to charge the first power source V ₁ , the second inductor L _b continues to discharge, and the sixth switch S _{cu of the} second power source circuit 12 By the end, the third inductor L _c energy continues to flow and flows through the fifth switch S _cd parasitic diode, the third inductor L _c also charges the second power source V ₂ , and the fourth inductor L _d continues to discharge. Mode eight [t ₇ -t _8]: when the time t = t _7, the first inductor L _a conduction mode in the synchronous operation, the first inductor current i _La increments above zero and sustain discharge, S _bd third switch is turned off, the The second inductor L _b energy continues to flow and flows through the parasitic diode of the fourth switch S _bu , and the fifth switch S _{cd of the} second power circuit 12 turns the fifth switch S _{cd to} zero voltage in the case of parasitic diode conduction. At the same time, the third inductor L _c also charges the second power source V ₂ , and the fourth inductor L _d continues to discharge. Mode IX [t ₈ -t ₉ ]: when time t=t ₈ , the first inductor L _a continues to discharge, and the fourth switch S _bu turns on the fourth switch S _bu zero voltage in the case of parasitic diode conduction, The third inductor L _{c of the} two power supply circuits 12 continues to charge the second power source V ₂ , and the fourth inductor L _d continues to discharge. Mode ten [t ₉ -t _10]: When the time t = t _9, the first inductor L _a continuous discharge current of the fourth switch S _{bu i} Sbu current increment to zero above, the DC bus 101 to start the second inductance L _{b is} stored, and at the same time, the first power source V _{1 is} charged, the third inductor L _c of the second power source circuit 12 continues to charge the second power source V ₂ , and the fourth inductor L _d continues to discharge. Mode XI [t ₁₀ -t ₁₁ ]: When time t=t ₁₀ , the first inductor L _a continues to discharge, the fourth switch S _{bu is turned} off, and the second inductor L _b energy continues to flow and flows through the third switch S _bd The parasitic diode also charges the first power source V ₁ , the third inductor L _{c of the} second power circuit 12 continues to charge the second power source V ₂ , and the fourth inductor L _d continues to discharge. Mode twelve [t ₁₁ -t ₁₂ ]: When time t=t ₁₁ , the first inductor L _a continues to discharge, the parasitic diode of the third switch S _bd is continuously turned on, and charges the first power source V ₁ , second The seventh switch S _{dd of the} power circuit 12 is _turned off, the fourth inductor L _{d is} freewheeling and flows through the parasitic diode of the eighth switch S _du , and the third inductor L _c continues to charge the second power source V ₂ . Mode thirteen [t ₁₂ -t ₁₃ ]: When time t=t ₁₂ , the first inductor L _{a is} continuously discharged, and in the case where the parasitic diode of the third switch S _bd is turned on, the third switch S _{bd is} zero-voltage Turning on, the parasitic diode of the eighth switch S _du of the second power circuit 12 is continuously turned on, the third inductor L _{c is} operated in the synchronous conduction mode, and the third inductor current i _{Lc is} incremented to above zero and continues to discharge. Mode 14 [t ₁₂ -t ₁₄ ]: When time t=t ₁₃ , the first inductor L _a continues to discharge, the second inductor L _b continues to charge the first power source V ₁ , and the eighth switch S of the second power source circuit 12 in the case of conducting _du parasitic diode, the eighth switch S _du zero voltage, the third sustain discharge inductor L _c. Mode fifteen [t ₁₄ -t ₁₅ ]: When time t=t ₁₄ , the first inductor L _a continues to discharge, the second inductor L _b continues to charge the first power source V ₁ , and the third inductor L of the second power source circuit 12 _c continues to discharge, the current i _Sdu current of the eighth switch S _du is increased to above zero, and the DC bus bar 101 starts to store energy for the fourth inductor L _d and simultaneously charges the second power source V ₂ . Mode sixteen [t ₁₅ -t ₁₆ ]: when time t=t ₁₅ , the first switch S _{ad is turned} off, the first inductor L _a energy is freewheeling and flows through the parasitic diode of the second switch S _au , the second inductor L _b continues to charge the first power source V ₁ , the third inductor L _{c of the} second power circuit 12 continues to discharge, the eighth switch S _{du is} turned off, the fourth inductor L _d energy continues to flow, and flows through the seventh switch S _dd The parasitic diode also charges the second power source V ₂ . Mode seventeen [t ₁₆ -t _17]: When the time t = t _16, the first inductor L _a continuous energy continues flowing through the second switch S _au the parasitic diode, the second inductor L _b in synchronous operation conduction mode, The current i _{Lb of the} second inductor L _b is increased to above zero and continues to discharge, and the seventh switch S _{dd of the} second power supply circuit 12 turns on the seventh switch S _dd zero voltage in the case of parasitic diode conduction, the third inductor L _c continues to discharge, completing a cycle of operation.

(4) Dual power supply reverse energy storage state: the first power source V ₁ and the second power source V _{2 are} in a reverse power storage state of the dual power source, assuming that the first power source voltage V _{1 is} greater than the second power source voltage V ₂ , the first power source V ₁ can be The buck charges the second power source V ₂ , or the second power source V ₂ boosts the first power source V ₁ , and the dual power supply reverse boost energy storage state is the same as the buck energy storage state mode, and only the operating switch duty cycle is different. Therefore, the boosted energy storage state is taken as an example. In the four-input power supply mode, mode 14, mode fifteen, and mode one, the second power source V ₂ is boosted by the fourth inductor L _d to the DC bus bar 101. powered by. The mode 7 to mode 10 of the dual input power supply state supplies power to the DC bus bar 101 after the second power source V ₂ is boosted via the third inductor L _c . In the mode ten to mode sixteen of the high voltage DC bus bar reverse buck energy storage state, the energy of the DC bus bar 101 is transmitted to the first power source V ₁ via the second inductor L _b to charge the first power source V ₁ . In mode 2 to mode 7 of the reverse buck energy storage state of the high voltage DC bus, the energy of the DC bus 101 is transmitted to the first power source V ₁ via the first inductor L _a , and the first power source V _{1 is} charged. The second power source V ₂ boosts the energy storage state to the first power source V ₁ . The first power source V ₁ is symmetrical to the boosted energy storage state of the second power source V ₂ , and is therefore omitted.

In order for the circuit to operate in synchronous conduction mode, the first to fourth inductance values must be specifically designed to meet the circuit requirements. Here, the first power source V ₁ uses a 42-63 V DC power supply to emulate the output voltage of the reversible solid oxide fuel cell, and the second power source V ₂ uses a 48 V DC power source to emulate the output voltage of the lithium ion battery. The DC bus 101 voltage is 200V DC, the total output power is 5 kW, and the circuit operates at 40KHz.

In the (1) single input power supply independent power supply state, the first inductance L _{c is} operated in the synchronous conduction mode , where η is the conversion efficiency (assumed to be 95%) when the system operates in a single-input power supply independent state (2.5 kW). The above formula, when the dead time is selected 0.05T _s and d ₁ = 0.71, the first inductor L _a case the inductance value is selected according to 14.4μ. At the same time, as can be seen from FIG. 2, one circuit operation cycle is composed of two duty cycles d ₁ and d ₂ and two dead time d _d , and the dead time d _d is to prevent the first switch S _ad and the second switch S. _{The au is} simultaneously turned on and ensures that the inductor operates in synchronous conduction mode. From the above, the duty cycle d ₂ =1-d ₁ -2d _d of the second switch S _au can be derived, and d ₂ =0.19 can be obtained from the previously selected duty cycle d ₁ and dead time d _d .

In (3) the high-voltage DC busbar reverse-pressure buck energy storage state, so that the magnitude of the inductance of the third inductor L _c is .

When the second power source V ₂ is 48 V and the output voltage Vo (the voltage of the DC bus bar 101) is 200 V, the duty cycle d _{3 of the} sixth switch S _cu can be known according to the selected dead time 0.05 T _s and the above equation. =0.19. At this time, the third inductor L _c inductance value may be selected to be 9.7 μH. At the same time, the duty cycle d _{4 of the} fifth switch S _cd = 1 - d _{3 - 2d d} , and d ₄ = 0.71 can be obtained from the previously selected duty cycle d ₃ and dead time d _d . In summary, when the circuit operates in a single-input power supply independent power supply state and a dual-input power supply state, the critical value of the inductance value of the first inductor to the fourth inductor is 14.4 μH. When the circuit operates in the reverse buck energy storage state of the high voltage DC bus, the threshold value of the inductance values of the first to fourth inductors is 9.7 μH, in order to make the circuit proposed in this embodiment in the forward boost and reverse buck. All the states can work normally. The inductance values of the first to fourth inductors are based on the selection of the smaller sense value, and considering the noise interference on the circuit and ensuring that the circuit can operate in the synchronous conduction mode, the architecture first arrives. The inductance of the fourth inductor is selected to be 9 μH.

In an embodiment of the invention, the first power source V ₁ uses a 42-63V DC power supply to emulate the output voltage of the reversible solid oxide fuel cell, and the second power source V ₂ uses a 48V DC power source to emulate the output voltage of the lithium ion battery, and the DC bus bar 101 The voltage is 200V DC, the maximum power of the first power circuit 11 is set to 2.5 kW, and the maximum power of the second power circuit 12 is set to 2.5 kW, and the maximum power of the power converter is 5 kW. The setting circuit operates at 40 kHz, and according to the circuit derivation theory and appropriately selects the power semiconductor switch and the diode, the voltage across the first switch to the eighth switch is the output voltage of 200V, and the maximum current flowing through the power semiconductor switch is 78.07A. The first to eighth switches select IXTQ88N28T, the sense of the first inductor to the fourth inductor is 9μH, and the output capacitor Co selects 150μF to ensure a lower output chopping voltage.

Please refer to FIG. 5. FIG. 5 is a diagram showing the efficiency of a reversible multi-input interleaved DC/DC converter according to an embodiment of the present invention. FIG. 5(a) is a diagram showing a power conversion efficiency of a single input independent power supply state, and test conditions. For the first power supply V ₁ input voltage 48V and the converter output voltage is 200V, the highest conversion efficiency is 95.8% in this operating state, and the curve (b) in FIG. 5 indicates that the first power source V ₁ and the second power source V _{2 are} jointly powered. State of the power conversion efficiency, the test conditions are the first power supply V ₁ input voltage 63V and the second power supply V ₂ input voltage is 48V, the converter output voltage is 200V, the highest conversion efficiency in this operating state is 95.1%, in Figure 5 ( c) The curve is the power conversion efficiency of the high voltage DC bus bar reverse buck energy storage state, the test condition is that the voltage of the DC bus bar 101 is 200V, the voltage of the first power terminal 11a is 63V, and the voltage of the second power terminal 12a is 48V. The highest conversion efficiency is 95.3% in the state, and the (d) curve in FIG. 5 is the power conversion efficiency of the dual power supply reverse energy storage state. The test condition is that the voltage of the first power terminal 11a is 42V and the voltage of the second power terminal 12a is 48V. operating The highest conversion efficiency in the state is 91%. Figure 5 verifies that the converter of the present invention has high power conversion efficiency.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of input currents of a reversible multi-input interleaved DC/DC converter and a conventional boost converter according to an embodiment of the present invention. When the input voltage of both converters is 170V and the output power is 2.5kW, the average input current is 15.4A. It can be seen from Fig. 6 that the conventional boost converter has continuous inductance and discharge energy, and the input current is chopped up to 78% at an output power of 2.5 kW (reference curve (e)). The interleaved converter of the present invention is outputted. When the power is 2.5kW, the input current ripple is 35% (reference curve (f)), which can greatly improve the problem of excessive input current ripple of the traditional boost architecture, and can also effectively protect the front-end input power.

[Possible effects of the examples]

In summary, the interleaved DC/DC converter provided by the embodiment of the present invention achieves high conversion efficiency through voltage flexible switching and inductive synchronous conduction. Similarly, the reversible multi-input interleaved DC/DC converter can operate on multiple input power sources (such as dual input power supplies) and bidirectional buck-boost, by properly selecting the inductor value to operate the inductor in synchronous conduction mode, and the switch operates at zero. In the voltage conduction mode, the diode is replaced by a power switch and is symmetrically constructed. Thereby, the input current ripple can be effectively reduced, and high conversion efficiency can be achieved.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

1‧‧‧Reversible Multi-Input Interleaved DC/DC Converter

101‧‧‧High-voltage DC busbar

11‧‧‧First interleaved boost circuit

12‧‧‧Second interleaved booster circuit

13‧‧‧Control circuit

11a‧‧‧First power terminal

V ₁ ‧‧‧First power supply

11b‧‧‧ first output

12a‧‧‧second power terminal

V ₂ ‧‧‧second power supply

12b‧‧‧second output

L _a ‧‧‧first inductance

L _b ‧‧‧second inductance

L _c ‧‧‧third inductance

L _d ‧‧‧ fourth inductance

S _ad ‧‧‧first switch

S _au ‧‧‧second switch

S _bd ‧‧‧third switch

S _bu ‧‧‧fourth switch

S _cd ‧‧‧ fifth switch

S _cu ‧‧‧ sixth switch

S _dd ‧‧‧ seventh switch

S _du ‧‧‧eighth switch

T _ad , T _au , T _bd , T _bu , T _cd , T _cu , T _dd , T _du , T _p1 , T _p2 ‧‧‧ drive signals

S _p1 ‧‧‧First power switch

S _p2 ‧‧‧second power switch

Vo‧‧‧ output voltage

Ro‧‧‧ load

C ₁ , C ₂ , Co‧‧‧ capacitors

GND‧‧‧ ground terminal

I ₁ , I ₂ ‧ ‧ current

Claims (11)

An interleaved DC/DC converter for supplying power to a load through a DC bus, the interleaved DC/DC converter comprising: a first interleaved boost circuit having a first power terminal and a a first output end, the first power supply end receives a first power supply, the first output end is coupled to the DC bus, the first interleaved boost circuit includes: a first inductor coupled to the first input a first switch coupled between the first inductor and a ground; a second switch coupled between the first inductor and the first output; a second inductor coupled to the second inductor a first input terminal; a third switch coupled between the second inductor and the ground; and a fourth switch coupled between the second inductor and the first output; and a control circuit And coupling the first switch, the second switch, the third switch, and the control end of the fourth switch, and driving the first switch, the second switch, the third switch, and the fourth switch The first switch, the second switch, Third switch and the fourth switch is turned on at zero voltage operation (Zero Voltage Switching, ZVS) mode, the first inductor and the second inductor conduction mode operation in a synchronous (Synchronous Conduction Mode, SCM). The interleaved DC/DC converter according to claim 1, wherein the control circuit controls the first switch, the second switch, the third switch, and the fourth switch to be turned on/off in the following order: When the current of an inductor turns on the parasitic diode of the first switch, the first switch zero voltage is turned on, and the first power source charges the second inductor; the second switch is turned off, at this time The current of the two inductors supplies power to the DC bus through the parasitic diode of the fourth switch; Turning the fourth switch to zero voltage, the first power source charges the first inductor; after the current of the second inductor decreases below zero and continues to discharge, the fourth switch is turned off, so that the second inductor a current flowing through the parasitic diode of the third switch; turning on the third switch zero voltage; turning off the first switch, wherein the current of the first inductor passes through the parasitic diode of the second switch The DC bus is powered; the second switch is turned on, and the first power source charges the second inductor; after the current of the first inductor decreases to below zero and continues to discharge, the second switch is turned off. To complete a cycle of operations. A reversible multi-input interleaved DC/DC converter for supplying power to a load through a DC bus, the reversible multi-input interleaved DC/DC converter comprising: at least one first interleaved boost circuit The first power supply terminal and the first power supply terminal, the first power supply terminal receives a first power supply, the first output terminal is coupled to the DC bus, the first interleaved boost circuit includes: An inductor coupled to the first input terminal; a first switch coupled between the first inductor and a ground; a second switch coupled between the first inductor and the first output a second inductor coupled to the first input terminal; a third switch coupled between the second inductor and the ground terminal; and a fourth switch coupled to the second inductor and the first Between the output terminals, at least one second interleaved booster circuit, having a second power supply end and a second output end, the second power supply end receiving a second power supply, the second output end coupled to the DC confluence Row, the second interleaved boost circuit includes: a first Inductively coupled to the second input terminal; a fifth switch coupled between the third inductor and the ground terminal; a sixth switch coupled between the third inductor and the second output; a fourth inductor coupled to the second input; a seventh switch coupled to the fourth inductor and the ground And an eighth switch coupled between the fourth inductor and the second output; and a control circuit coupled to the first switch, the second switch, the third switch, and the fourth a control switch of the switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch, and driving the first switch, the second switch, the third switch, the fourth switch, and the fifth The switch, the sixth switch, the seventh switch, and the eighth switch are turned on and off; wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first The sixth switch, the seventh switch, and the eighth switch operate in a Zero Voltage Switching (ZVS) mode, and the first inductor, the second inductor, the third inductor, and the fourth inductor operate in a synchronous conduction mode (Synchronous Conduction Mode, SCM). A reversible multi-input interleaved DC/DC converter according to claim 3, wherein the control circuit controls the first interleaved boost circuit or the second interleaved boost circuit to independently supply power to the DC confluence row. A reversible multi-input interleaved DC/DC converter according to claim 3, wherein the control circuit is controlled when both the first interleaved boost circuit and the second interleaved boost circuit output power The first interleaved boost circuit and the second interleaved boost circuit are powered to the DC bus. The reversible multi-input interleaved DC/DC converter according to claim 3, wherein the high voltage DC bus is coupled to the first interleaved boost circuit and the second interleaved At least one of the second power sources coupled to the voltage circuit is charged. A reversible multi-input interleaved DC/DC converter according to claim 3, wherein the first interleaved boost circuit is coupled to the second interleaved boost circuit The second power source is charged, or the second interleaved boost circuit charges the first power source coupled to the first interleaved boost circuit. The reversible multi-input interleaved DC/DC converter according to claim 3, wherein the first switch and the second switch are in a complementary state, and the first switch and the second switch are turned on/off. Having a dead time; wherein the third switch and the fourth switch are in a complementary state, and the third switch and the fourth switch are turned on/off to have the dead time; wherein the fifth switch and the sixth The conduction state of the switch is complementary, and the fifth switch and the sixth switch are turned on/off to have the dead time; wherein the seventh switch and the eighth switch are in a complementary state, and the seventh switch and the The on/off of the eighth switch has the dead time. A reversible multi-input interleaved DC/DC converter according to claim 4, wherein the control circuit controls the first switch when the first interleaved boost circuit is independently powered to the DC bus The sequence of the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch being turned on/off is as follows: the current in the first inductor makes the first When the parasitic diode of a switch is turned on, the first switch zero voltage is turned on, and the first power source charges the second inductor: the second switch is turned off, and the current of the second inductor passes through the first The parasitic diode of the four switch supplies power to the DC bus; the fourth switch is turned on, and the first power source charges the first inductor; the current in the second inductor decreases below zero and continues to discharge After the fourth switch is turned off, the current of the second inductor flows through the parasitic diode of the third switch; the third switch is turned on; the first switch is turned off, and the first inductor is Current through the second Off the parasitic diode of the DC power supply bus; Turning the second switch to zero voltage, the first power source charges the second inductor; after the current of the first inductor decreases below zero and continues to discharge, the second switch is turned off to complete a cycle. operating. A reversible multi-input interleaved DC/DC converter according to claim 5, wherein the control circuit controls the second interleaved boost circuit and the first interleaved boost circuit to supply the DC confluence The control circuit controls the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch to be turned on/off The sequence is as follows: the first switch zero voltage is turned on, at which time the first power source charges the second inductor, the fourth inductor charges the DC bus, and the second power source charges the third inductor; After the current of the four inductors decreases below zero and continues to discharge, the second switch and the eighth switch are turned off, and the current of the second inductor is charged to the DC bus through the parasitic diode of the fourth switch. The current of the fourth inductor flows through the parasitic diode of the seventh switch; the fourth switch and the seventh switch are turned on, and the first power source charges the first inductor; Current is reduced to After the discharge is continued, the fourth switch is turned off, and the current of the second inductor flows through the parasitic diode of the third switch; the third switch is turned on, and the fifth switch is turned off. At this time, the current of the third inductor flows through the parasitic diode of the sixth switch, and the second power source charges the fourth inductor; the zero voltage of the sixth switch is turned on, and the third inductor is connected to the DC current. The power supply is discharged; after the current of the third inductor is decremented to below zero and continues to be discharged, the first switch is turned off, and the first inductor supplies power to the DC bus through the parasitic diode of the second switch; Turning off the sixth switch, the current of the third inductor flows through the parasitic diode of the fifth switch; the second switch and the fifth switch are turned on, and the first power source is The second inductor charges the fourth inductor, and after the current of the first inductor decreases to below zero and continues to discharge, the eighth switch is turned off, and the current of the fourth inductor passes through the eighth The parasitic diode of the switch supplies power to the DC bus; the second switch is turned off, and the eighth switch zero voltage is turned on to complete one cycle of operation. A reversible multi-input interleaved DC/DC converter according to claim 6 wherein the high voltage DC bus is charged to the first interleaved boost circuit and the second interleaved boost circuit The control circuit controls the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch to be turned on/off in the following order: Turning the second switch to zero voltage, and after the current of the second switch is increased to above zero, the DC bus is charged to the first power source through the first inductor; the second switch is turned off, at this time An inductor current flows through the parasitic diode of the first switch; the first switch zero voltage is turned on, and the fifth switch is turned off, and the current of the third inductor flows through the parasitic second of the sixth switch a pole body, the current of the fourth inductor is increased to above zero and continues to discharge; the sixth voltage of the sixth switch is turned on, and after the current of the sixth switch is increased to above zero, the DC bus is transmitted through the third inductor pair The second power supply Turning off the sixth switch, the current of the third inductor flows through the parasitic diode of the fifth switch; after the current of the first inductor increases to above zero and continues to discharge, the third switch is turned off. And turning on the fifth voltage of the fifth switch, wherein the current of the second inductor flows through the parasitic diode of the fourth switch; Turning the fourth switch to zero voltage, and after the current of the fourth switch is increased to above zero, the DC bus is charged to the first power source through the second inductor; the fourth switch is turned off, at this time a current of the second inductor flows through the parasitic diode of the third switch; the seventh switch is turned off, and the current of the fourth inductor flows through the parasitic diode of the eighth switch; The voltage is turned on; after the third inductor current is increased to above zero and continues to be discharged, the eighth switch is turned on; and after the current of the eighth switch is increased to above zero, the DC bus is transmitted through the fourth inductor pair. The second power source is charged; the first switch and the eighth switch are turned off, and the current of the first inductor flows through the parasitic diode of the second switch, and the current of the fourth inductor flows through the seventh switch The parasitic diode charges the second power source; the seventh switch is turned on to zero voltage to complete a cycle of operation.