A dual-output device and output method that can be combined with a flexible battery

Abstract

The present invention proposes a two-output device and an output method that can be combined with a flexible battery, which relate to the field of power conversion technology; specifically, it includes a link inductor Link, an input unit, a first output unit and a second output unit; the link inductor Link serves as an energy storage element; the input end of the input unit is electrically connected to a power supply, and the output end of the input unit is electrically connected to both ends of the link inductor Link; the input end of the first output unit is electrically connected to both ends of the link inductor Link, and the output end of the first output unit is electrically connected to a first load; the input end of the second output unit is electrically connected to the output end of the input unit, and the output end of the second output unit is electrically connected to a second load; wherein the link inductor Link outputs a DC signal, an AC signal to the first load during a discharge phase, or outputs DC and AC signals to the first load and the second load at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of power conversion, and in particular to a dual-output device and an output method that can be combined with a flexible battery. Background Art

[0002] The output principle of conventional energy storage devices is as follows Figure 1 As shown, through two DC conversions and one inverter process, DC or AC output is achieved. The DC input signal of the inverter circuit is provided by the DC energy storage capacitor in the circuit, but the DC energy storage capacitor is the cause of most system events in the power field. In addition, the DC energy storage capacitor is often considered to be the most serious reliability problem of the inverter. The DC capacitor may gradually age with heat or electrochemical processes, resulting in a decrease in capacitance and an increase in leakage current. This leakage current will not only reduce the performance of the capacitor, but also cause a decrease in inverter efficiency and cause electrical failures or fire risks. In addition, the DC energy storage capacitor is sensitive to temperature. For every 10 degrees Celsius increase in operating temperature, the service life of the capacitor is halved. Therefore, it is necessary to provide a power conversion device with higher reliability and longer service life.

[0003] Figure 1 There are two DC conversion links in the topology diagram, and two independent inductors are configured. If the two inductors can be integrated and replace the energy storage capacitor in the inverter link, the unreliable DC capacitor problem can be overcome. Therefore, it is very necessary to provide a two-output device that can be combined with a flexible battery, and use an inductor to replace the DC energy storage capacitor link to improve the reliability of the power supply. Summary of the invention

[0004] In view of this, the present invention proposes a dual-output device and output method that does not use a DC energy storage capacitor in the inverter link, has good extended output capability, reduces system complexity, and can be combined with a flexible battery.

[0005] In one aspect, the present invention provides a two-output device that can be combined with a flexible battery, including a link inductor Link, an input unit, a first output unit, and a second output unit;

[0006] The link inductor Link is used as an energy storage element;

[0007] The input end of the input unit is electrically connected to the power supply, and the output end of the input unit is electrically connected to both ends of the link inductor Link respectively;

[0008] The input end of the first output unit is electrically connected to the two ends of the link inductor Link respectively, and the output end of the first output unit is electrically connected to the first load;

[0009] The input end of the second output unit is electrically connected to the output end of the input unit respectively, and the output end of the second output unit is electrically connected to the second load;

[0010] In the discharge phase of the link inductor Link, a DC signal or an AC signal is output to the first load, or a DC signal and an AC signal are output to the first load and the second load at the same time.

[0011] On the basis of the above technical solution, preferably, the input unit includes an input inductor L1, an input capacitor C1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first IGBT device S1, a second IGBT device S2, a third IGBT device S3 and a fourth IGBT device S4; the anode of the first diode D1 is electrically connected to one end of the input inductor L1, one end of the input capacitor C1 and the anode of the fourth diode D4, respectively, and the other end of the input inductor is electrically connected to one end of the power supply; the cathode of the first diode D1 is electrically connected to the drain of the first IGBT device, and the source of the first IGBT device is electrically connected to the anode of the second diode D2 and one end of the link inductor Link, respectively. The cathode of the second diode D2 is electrically connected to the drain of the second IGBT device S2, the source of the second IGBT device S2 is electrically connected to the other end of the input capacitor C1, the other end of the power supply and the source of the third IGBT device S3, the drain of the third IGBT device S3 is electrically connected to the cathode of the third diode D3, the anode of the third diode D3 is electrically connected to the other end of the link inductor Link and the source of the fourth IGBT device S4, and the drain of the fourth IGBT device S4 is electrically connected to the cathode of the fourth diode D4; the other end of the input inductor L1 and the other end of the input capacitor C1 serve as the input end of the input unit; the anode of the second diode D2 and the anode of the third diode D3 serve as the output end of the input unit.

[0012] Preferably, the first output unit includes a plurality of IGBT devices, a first output inductor L2 and a first output capacitor C2; the source of the ninth IGBT device S9 is electrically connected to the source of the tenth IGBT device S10 and one end of the link inductor Link, respectively, the drain of the ninth IGBT device S9 is electrically connected to the drain of the eleventh IGBT device S11, the source of the eleventh IGBT device S11 is electrically connected to the source of the thirteenth IGBT device S13, one end of the first output inductor L2 and one end of the first output capacitor C2, and the other end of the first output inductor L2 is electrically connected to one end of the first load; the drain of the thirteenth IGBT device S13 is electrically connected to the drain of the fifteenth IGBT device S15, and the drain of the fifteenth IGBT device S15 is electrically connected to the drain of the fifteenth IGBT device S15. The source of device S15 is electrically connected to the other end of the link inductor Link and the source of the sixteenth IGBT device S16, respectively; the drain of the sixteenth IGBT device S16 is electrically connected to the drain of the fourteenth IGBT device S14; the source of the fourteenth IGBT device S14 is electrically connected to the other end of the first output capacitor C2, the other end of the first load and the source of the twelfth IGBT device S12, respectively; the drain of the twelfth IGBT device S12 is electrically connected to the drain of the tenth IGBT device S10; the source of the ninth IGBT device S9 and the source of the fifteenth IGBT device serve as the input end of the first output unit; the other end of the first output inductor L2 and the other end of the first output capacitor C2 serve as the output end of the first output unit.

[0013] Further preferably, the second output unit includes a second output inductor L3, a second output capacitor C3, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a fifth IGBT device S5, a sixth IGBT device S6, a seventh IGBT device S7 and an eighth IGBT device S8; the source of the fifth IGBT device S5 is electrically connected to the anode of the sixth diode D6 and the anode of the second diode D2 respectively; the drain of the fifth IGBT device S5 is electrically connected to the cathode of the fifth diode D5, the anode of the fifth diode D5 is electrically connected to the anode of the eighth diode D8, one end of the second output inductor L3 and one end of the second output capacitor C3 respectively, and the other end of the second output inductor L3 is electrically connected to the cathode of the fifth diode D5. The end is electrically connected to one end of the second load, the cathode of the eighth diode D8 is electrically connected to the drain of the eighth IGBT device S8, the source of the eighth IGBT device S8 is electrically connected to the anode of the seventh diode D7 and the anode of the third diode D3 respectively, the cathode of the seventh diode D7 is electrically connected to the source of the sixth IGBT device S6, the other end of the second output capacitor C3 and the other end of the second load respectively, the drain of the sixth IGBT device S6 is electrically connected to the cathode of the sixth diode D6; the source of the fifth IGBT device S5 and the source of the eighth IGBT device S8 serve as the input end of the second output unit; the other end of the second output inductor L3 and the other end of the second output capacitor C3 serve as the output end of the second output unit.

[0014] More preferably, a freewheeling diode is provided between the source and the drain of each IGBT device.

[0015] In another aspect, the present invention provides an output method of two output devices that can be combined with a flexible battery, comprising the following steps:

[0016] S1: Configuring the above-mentioned two output devices that can be combined with the flexible battery;

[0017] S2: Implementing a DC-DC power transmission mode: In this mode, the first output unit outputs a DC signal as a DC output side;

[0018] S21, forward charging: turn on the first IGBT device S1 and the third IGBT device S3, and the energy flows to the power supply, input inductor L1, input capacitor C1, first diode D1, first IGBT device S1, link inductor Link, third diode D3 and third IGBT device S3, so as to realize the forward charging of link inductor Link; after the forward charging stage is completed, turn off the first IGBT device S1 and the third IGBT device S3;

[0019] S22, forward discharge: turn on the ninth IGBT device S9 and the fourteenth IGBT device S14, and the energy flows to the link inductor Link, the freewheeling diode of the sixteenth IGBT device S16, the fourteenth IGBT device, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the eleventh IGBT device S11 and the ninth IGBT device S9, and the link inductor Link outputs a DC signal to the first load; after the forward discharge is completed, turn off the ninth IGBT device S9 and the fourteenth IGBT device S14;

[0020] S23, reverse charging: turn on the second IGBT device S2 and the fourth IGBT device S4, and the energy flows to the power supply, input inductor L1, input capacitor C1, fourth diode D4, fourth IGBT device S4, link inductor Link, second diode D2 and second IGBT device S2; after reverse charging is completed, turn off the second IGBT device S2 and the fourth IGBT device S4;

[0021] S24, reverse discharge: turn on the twelfth IGBT device S12 and the fifteenth IGBT device S15, and the energy flows to the link inductor Link, the freewheeling diode of the tenth IGBT device S10, the twelfth IGBT device, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the thirteenth IGBT device S13 and the fifteenth IGBT device S15, and the link inductor Link outputs a DC signal to the first load; after the reverse discharge is completed, turn off the twelfth IGBT device S12 and the fifteenth IGBT device S15;

[0022] S3: Implementing a DC-AC power transmission mode: In this mode, the first output unit outputs an AC signal as an AC output side;

[0023] S31, forward charging: the implementation process is exactly the same as step S21;

[0024] S32, forward discharge: in the first half cycle of the output alternating signal, the ninth IGBT device S9 and the fourteenth IGBT device S14 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the sixteenth IGBT device S16, the fourteenth IGBT device S14, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the eleventh IGBT device S11 and the ninth IGBT device S9, and then the ninth IGBT device S9 and the fourteenth IGBT device S14 are turned off; in the second half cycle of the output alternating signal, the tenth IGBT device S10 and the thirteenth IGBT device S13 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the fifteenth IGBT device S15, the thirteenth IGBT device S13, the first output inductor L2, the first output capacitor C2, the first load, the freewheeling diode of the twelfth IGBT device S12 and the tenth IGBT device S10, and then the tenth IGBT device S10 and the thirteenth IGBT device S13 are turned off;

[0025] S33, reverse charging: the implementation process is exactly the same as step S23;

[0026] S34, reverse discharge: in the first half cycle of outputting the alternating signal, the twelfth IGBT device S12 and the fifteenth IGBT device S15 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the tenth IGBT device S10, the twelfth IGBT device S12, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the thirteenth IGBT device S13 and the fifteenth IGBT device S15, and then the twelfth IGBT device S12 and the fifteenth IGBT device S15 are turned off; in the second half cycle of outputting the alternating signal, the eleventh IGBT device S11 and the sixteenth IGBT device S16 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the ninth IGBT device S9, the eleventh IGBT device S11, the first output capacitor C2, the first output inductor L2, the first load, the freewheeling diode of the fourteenth IGBT device and the sixteenth IGBT device S16, and then the eleventh IGBT device S11 and the sixteenth IGBT device S16 are turned off;

[0027] S4: Implementing a DC-DC-AC power transmission mode: In this mode, the second output unit outputs a DC signal as a DC output side, and the first output unit outputs an AC signal as an AC output side;

[0028] S41; Forward charging: the implementation process is exactly the same as step S21;

[0029] S42: DC end discharge: turn on the fifth IGBT device S5 and the seventh IGBT device S7, and the energy flows to the link inductor Link, the seventh diode D7, the seventh IGBT device S7, the second output capacitor C3, the second load, the second output inductor L3, the fifth diode D5 and the fifth IGBT device S5, and then turn off the fifth IGBT device S5 and the seventh IGBT device S7;

[0030] S43: Discharging at the AC end: the remaining current after the DC end is discharged is discharged to the AC output end, and the energy flow direction is the same as step S32;

[0031] S44: Reverse charging: the implementation process is exactly the same as step S23;

[0032] S45: DC end discharge: turn on the sixth IGBT device S6 and the eighth IGBT device S8, and the energy flows to the link inductor Link, the sixth diode D6, the sixth IGBT device S6, the second output capacitor C3, the second load, the second output inductor L3, the eighth diode D8 and the eighth IGBT device S8, and then turn off the sixth IGBT device S6 and the eighth IGBT device S8;

[0033] S46: Discharging at the AC end: After discharging at the DC end, the remaining current is discharged to the AC output end, and the energy flow direction is the same as step S32.

[0034] Preferably, the parameter calculation formula of the link inductance Link is as follows: ,in is the input voltage of the power supply; forward charging time 0.29 t , t A link cycle includes two charge and discharge cycles: forward charge and discharge and reverse charge and discharge; is the peak current at the link inductor output.

[0035] Further preferably, the input inductor L1 satisfies the following relationship:

[0036] , ,in is the voltage across the input inductor L1; is the current of the input inductor L1; is the voltage of input capacitor C1; D is the on-duty ratio, T is the time corresponding to a cycle, DT is the conduction time of the input terminal in one cycle, is the current change of the input inductor when the current on the link inductor reaches its peak value, ; for The maximum value of , is the input power of the power supply, is the ripple factor, and the input inductance L1 is obtained by calculation;

[0037] The input capacitance C1 is calculated as follows:

[0038] The voltage change of input capacitor C1 in one cycle is the same. When the link inductor is discharged, the voltage change of input capacitor C1 is for: , is the capacitive current when the link inductor is discharged; is the total discharge time in one cycle; the voltage change when the input capacitor is discharged for , The time when the direction of the input capacitor current is the same as the direction of the input capacitor reference voltage; the voltage change when the input capacitor is charged during one cycle for , t charge The input capacitor charging time is sufficient to meet ; Solve to obtain the input capacitance C1.

[0039] More preferably, the output inductor on the AC output side Lac Satisfies the following relationship: , is the voltage of the output inductor on the AC output side; is the current of the output inductor on the AC output side; is the voltage of the output capacitor on the AC output side; It is the AC output voltage provided to the AC load by the AC output side; is the duty cycle of the AC output on the AC output side; It is the current change of the output inductor on the AC output side when the link inductor discharge reaches the current peak The maximum value of , is the output power on the AC output side; , in both formulas and Equal, find the output inductance of the AC output side Lac ;

[0040] Output capacitor on the AC output side Cac Frequency The frequency is less than the link inductance ,satisfy , output capacitor on the AC output side Cac With output inductor Lac Angular frequency when resonance occurs ,have , after transformation, we get .

[0041] More preferably, the output inductor on the DC output side Ld Satisfies the following relationship: , is the voltage of the output inductor on the DC output side, is the voltage of the output capacitor on the DC output side; It is the DC output voltage provided to the DC load by the DC output side; is the duty cycle of the DC output on the DC output side; is the current of the output inductor on the DC output side; The current change of the output inductor on the DC output side when the link inductor discharge reaches the current peak The maximum value of , , is the output power on the DC output side, and the output inductance on the DC output side is obtained by combining Ld ;

[0042] Output capacitor on DC output side Cdc Frequency The frequency is less than the link inductance ,satisfy , output capacitance on the DC output side Cdc With output inductance Ld Angular frequency when resonance occurs ,have , after transformation, we get .

[0043] The present invention provides a dual-output device and output method that can be combined with a flexible battery, which has the following beneficial effects compared with the prior art:

[0044] The present invention improves the circuit structure, integrates the inductors used for two DC conversions, and uses only one link inductor to store and transfer energy. In addition to DC output and AC output, it replaces the DC energy storage capacitor in the conventional inverter structure, and can also output DC and AC signals at the same time. Moreover, the discharge phase when AC and DC are output simultaneously can be divided into two parts, one part of the energy enters the DC side, and the other part enters the AC side. By controlling the current peak value, charging time and discharge time of the link inductor, different outputs can be generated, and the outputs are connected to the DC load and the AC load respectively to meet the diversified output requirements. Since no DC energy storage capacitor is used, the reliability of the power distribution equipment is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 Schematic diagram for conventional energy storage device output;

[0047] Figure 2 A circuit block diagram of a two-output device and an output method that can be combined with a flexible battery according to the present invention;

[0048] Figure 3 The present invention is a complete circuit diagram of a two-output device and an output method that can be combined with a flexible battery. DETAILED DESCRIPTION

[0049] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In view of this, if Figure 2 and Figure 3 As shown, on the one hand, the present invention provides a two-output device that can be combined with a flexible battery, including a link inductor Link, an input unit, a first output unit and a second output unit;

[0051] The link inductor Link is used as an energy storage element;

[0052] The input end of the input unit is electrically connected to the power supply, and the output end of the input unit is electrically connected to both ends of the link inductor Link respectively;

[0053] The input end of the first output unit is electrically connected to the two ends of the link inductor Link respectively, and the output end of the first output unit is electrically connected to the first load;

[0054] The input end of the second output unit is electrically connected to the output end of the input unit respectively, and the output end of the second output unit is electrically connected to the second load;

[0055] The link inductor Link outputs a DC signal or an AC signal to the first load during the discharge phase, or outputs a DC signal and an AC signal to the first load and the second load at the same time. That is, the device has three output states: DC-DC, DC-AC, and DC-DC-AC.

[0056] Combination Figure 2 and Figure 3 As shown, the input unit includes an input inductor L1, an input capacitor C1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first IGBT device S1, a second IGBT device S2, a third IGBT device S3 and a fourth IGBT device S4; the anode of the first diode D1 is electrically connected to one end of the input inductor L1, one end of the input capacitor C1 and the anode of the fourth diode D4, respectively, and the other end of the input inductor is electrically connected to one end of the power supply; the cathode of the first diode D1 is electrically connected to the drain of the first IGBT device, the source of the first IGBT device is electrically connected to the anode of the second diode D2 and one end of the link inductor Link, respectively, and the second diode D 2 is electrically connected to the drain of the second IGBT device S2, the source of the second IGBT device S2 is electrically connected to the other end of the input capacitor C1, the other end of the power supply and the source of the third IGBT device S3, the drain of the third IGBT device S3 is electrically connected to the cathode of the third diode D3, the anode of the third diode D3 is electrically connected to the other end of the link inductor Link and the source of the fourth IGBT device S4, and the drain of the fourth IGBT device S4 is electrically connected to the cathode of the fourth diode D4; the other end of the input inductor L1 and the other end of the input capacitor C1 serve as the input end of the input unit; the anode of the second diode D2 and the anode of the third diode D3 serve as the output end of the input unit. The input unit can form two loops, one loop is the input inductor L1, the input capacitor C1, the first diode D1, the first IGBT device S1, the link inductor Link, the third diode D3, and the third IGBT device S3, that is, a forward charging loop in the same direction as the reference voltage; the other loop is the input inductor L1, the input capacitor C1, the fourth diode D4, the fourth IGBT device S4, the link inductor Link, the second diode D2, and the second IGBT device S2, that is, a reverse charging loop in the opposite direction to the reference voltage.

[0057] The first output unit includes a plurality of IGBT devices, a first output inductor L2 and a first output capacitor C2; the source of the ninth IGBT device S9 is electrically connected to the source of the tenth IGBT device S10 and one end of the link inductor Link respectively, the drain of the ninth IGBT device S9 is electrically connected to the drain of the eleventh IGBT device S11, the source of the eleventh IGBT device S11 is electrically connected to the source of the thirteenth IGBT device S13, one end of the first output inductor L2 and one end of the first output capacitor C2 respectively, the other end of the first output inductor L2 is electrically connected to one end of the first load; the drain of the thirteenth IGBT device S13 is electrically connected to the drain of the fifteenth IGBT device S15, the fifteenth IGBT device S The source of 15 is electrically connected to the other end of the link inductor Link and the source of the sixteenth IGBT device S16, the drain of the sixteenth IGBT device S16 is electrically connected to the drain of the fourteenth IGBT device S14, the source of the fourteenth IGBT device S14 is electrically connected to the other end of the first output capacitor C2, the other end of the first load and the source of the twelfth IGBT device S12, the drain of the twelfth IGBT device S12 is electrically connected to the drain of the tenth IGBT device S10; the source of the ninth IGBT device S9 and the source of the fifteenth IGBT device serve as the input end of the first output unit; the other end of the first output inductor L2 and the other end of the first output capacitor C2 serve as the output end of the first output unit. In different output modes, the first output unit outputs different signals. In the DC-DC output mode, the first output unit outputs a DC signal as a DC output side; in the DC-AC output mode and the DC-DC-AC mode, the first output unit outputs an AC signal as an AC output side.

[0058] The second output unit includes a second output inductor L3, a second output capacitor C3, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a fifth IGBT device S5, a sixth IGBT device S6, a seventh IGBT device S7 and an eighth IGBT device S8; the source of the fifth IGBT device S5 is electrically connected to the anode of the sixth diode D6 and the anode of the second diode D2 respectively; the drain of the fifth IGBT device S5 is electrically connected to the cathode of the fifth diode D5, the anode of the fifth diode D5 is electrically connected to the anode of the eighth diode D8, one end of the second output inductor L3 and one end of the second output capacitor C3 respectively, the other end of the second output inductor L3 is electrically connected to the second One end of the load is electrically connected, the cathode of the eighth diode D8 is electrically connected to the drain of the eighth IGBT device S8, the source of the eighth IGBT device S8 is electrically connected to the anode of the seventh diode D7 and the anode of the third diode D3 respectively, the cathode of the seventh diode D7 is electrically connected to the source of the sixth IGBT device S6, the other end of the second output capacitor C3 and the other end of the second load respectively, the drain of the sixth IGBT device S6 is electrically connected to the cathode of the sixth diode D6; the source of the fifth IGBT device S5 and the source of the eighth IGBT device S8 serve as the input end of the second output unit; the other end of the second output inductor L3 and the other end of the second output capacitor C3 serve as the output end of the second output unit. In the DC-DC-AC mode, the second output unit outputs a DC signal as a DC output side.

[0059] A freewheeling diode is provided between the source and drain of each IGBT device. The freewheeling diode is reversely connected between the drain and source of the IGBT device, providing a current channel when the IGBT device is turned off.

[0060] On the other hand, the present invention provides an output method of two output devices that can be combined with a flexible battery, which specifically includes the following steps:

[0061] S1: Configuring the above-mentioned two output devices that can be combined with the flexible battery.

[0062] S2: Reference Figure 2 and Figure 3 , realizing DC-DC power transmission mode: in this mode, the first output unit outputs a DC signal as the DC output side; the energy flows from power supply-link inductor Link-first output unit.

[0063] S21, forward charging: turn on the first IGBT device S1 and the third IGBT device S3, and the energy flows to the power supply, input inductor L1, input capacitor C1, first diode D1, first IGBT device S1, link inductor Link, third diode D3 and third IGBT device S3, so as to realize the forward charging of link inductor Link; after the forward charging stage is completed, turn off the first IGBT device S1 and the third IGBT device S3;

[0064] The following equation is satisfied during forward charging: = , is the input voltage of the power supply, is the peak current at the link inductor output, is the charging time, after integration, we get , Formula 1, The current of the link inductor is affected by the input voltage and the charging time. When the input voltage is constant, the link inductor current can be controlled by changing the charging time, that is, the switching frequency.

[0065] S22, forward discharge: turn on the ninth IGBT device S9 and the fourteenth IGBT device S14, and the energy flows to the link inductor Link, the freewheeling diode of the sixteenth IGBT device S16, the fourteenth IGBT device, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the eleventh IGBT device S11 and the ninth IGBT device S9, and the link inductor Link outputs a DC signal to the first load; after the forward discharge is completed, turn off the ninth IGBT device S9 and the fourteenth IGBT device S14;

[0066] At this time, the link inductor discharges to the output end, and the link inductor current during forward discharge satisfies the following formula: , Formula 2, where U out is the output voltage of the first output unit, is the total discharge time in one cycle. At this time, the first output unit is affected by the output voltage. If the output voltage reference value is equal to the input voltage, the discharge time is equal to the charging time. If the output voltage is twice the input voltage, the discharge time is half the charging time.

[0067] S23, reverse charging: turn on the second IGBT device S2 and the fourth IGBT device S4, and the energy flows to the power supply, input inductor L1, input capacitor C1, fourth diode D4, fourth IGBT device S4, link inductor Link, second diode D2 and second IGBT device S2; after reverse charging is completed, turn off the second IGBT device S2 and the fourth IGBT device S4;

[0068] S24, reverse discharge: turn on the twelfth IGBT device S12 and the fifteenth IGBT device S15, and the energy flows to the link inductor Link, the freewheeling diode of the tenth IGBT device S10, the twelfth IGBT device, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the thirteenth IGBT device S13 and the fifteenth IGBT device S15, and the link inductor Link outputs a DC signal to the first load; after the reverse discharge is completed, turn off the twelfth IGBT device S12 and the fifteenth IGBT device S15;

[0069] S3: Implementing a DC-AC power transmission mode: In this mode, the first output unit outputs an AC signal as an AC output side;

[0070] S31, forward charging: the implementation process is exactly the same as step S21;

[0071] S32, forward discharge: in the first half cycle of the output alternating signal, the ninth IGBT device S9 and the fourteenth IGBT device S14 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the sixteenth IGBT device S16, the fourteenth IGBT device S14, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the eleventh IGBT device S11 and the ninth IGBT device S9, and then the ninth IGBT device S9 and the fourteenth IGBT device S14 are turned off; in the second half cycle of the output alternating signal, the tenth IGBT device S10 and the thirteenth IGBT device S13 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the fifteenth IGBT device S15, the thirteenth IGBT device S13, the first output inductor L2, the first output capacitor C2, the first load, the freewheeling diode of the twelfth IGBT device S12 and the tenth IGBT device S10, and then the tenth IGBT device S10 and the thirteenth IGBT device S13 are turned off;

[0072] S33, reverse charging: the implementation process is exactly the same as step S23;

[0073] S34, reverse discharge: in the first half cycle of outputting the alternating signal, the twelfth IGBT device S12 and the fifteenth IGBT device S15 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the tenth IGBT device S10, the twelfth IGBT device S12, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the thirteenth IGBT device S13 and the fifteenth IGBT device S15, and then the twelfth IGBT device S12 and the fifteenth IGBT device S15 are turned off; in the second half cycle of outputting the alternating signal, the eleventh IGBT device S11 and the sixteenth IGBT device S16 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the ninth IGBT device S9, the eleventh IGBT device S11, the first output capacitor C2, the first output inductor L2, the first load, the freewheeling diode of the fourteenth IGBT device and the sixteenth IGBT device S16, and then the eleventh IGBT device S11 and the sixteenth IGBT device S16 are turned off;

[0074] S4: Implementing a DC-DC-AC power transmission mode: In this mode, the second output unit outputs a DC signal as a DC output side, and the first output unit outputs an AC signal as an AC output side;

[0075] S41; Forward charging: the implementation process is exactly the same as step S21;

[0076] S42: DC end discharge: turn on the fifth IGBT device S5 and the seventh IGBT device S7, and the energy flows to the link inductor Link, the seventh diode D7, the seventh IGBT device S7, the second output capacitor C3, the second load, the second output inductor L3, the fifth diode D5 and the fifth IGBT device S5, and then turn off the fifth IGBT device S5 and the seventh IGBT device S7;

[0077] S43: Discharging at the AC end: the remaining current after the DC end is discharged is discharged to the AC output end, and the energy flow direction is the same as step S32;

[0078] S44: Reverse charging: the implementation process is exactly the same as step S23;

[0079] S45: DC end discharge: turn on the sixth IGBT device S6 and the eighth IGBT device S8, and the energy flows to the link inductor Link, the sixth diode D6, the sixth IGBT device S6, the second output capacitor C3, the second load, the second output inductor L3, the eighth diode D8 and the eighth IGBT device S8, and then turn off the sixth IGBT device S6 and the eighth IGBT device S8;

[0080] S46: Discharging at the AC end: After discharging at the DC end, the remaining current is discharged to the AC output end, and the energy flow direction is the same as step S32.

[0081] In order to better output DC or AC signals, the parameter calculation formula of link inductance Link is as follows: ,in is the input voltage of the power supply; forward charging time =0.29 t , t A link cycle includes two charge and discharge cycles: forward charge and discharge and reverse charge and discharge; is the peak current at the link inductor output.

[0082] For example, setting the input voltage The sine wave is 150V, the amplitude is 220V, the period is 0.02s, the frequency is 50Hz, and from 0-0.005s, the sine wave rises from 0V to 220V. During this period, the closer the time is to 0.005s, the greater the current of the link inductor, and the longer the corresponding charging and discharging time will be. Therefore, it is believed that in the longest link inductor charging and discharging cycle, the time is one-fiftieth of 0.005s to achieve a better effect. The longest link cycle t The forward charging time is 0.0001s, the forward charging time is 0.000029s, and the link inductance peak current corresponding to the 220V AC output and 200V DC output is For 200A, the formula The calculated link inductance is 21.7μH.

[0083] For the input unit, its input inductance L1 satisfies the following relationship:

[0084] , ,in is the voltage across the input inductor L1; is the current of the input inductor L1; is the voltage of input capacitor C1; is the on-duty ratio, is the time corresponding to a cycle, DT is the conduction time of the input terminal in one cycle, is the current change of the input inductor when the current on the link inductor reaches its peak value, ; for The maximum value of , is the input power of the power supply, is the ripple factor, which is obtained by calculation. For example, the voltage of the input inductor L1 is 1V, the duty cycle is 0.59, and the period is 4.9×10 -5s, the ripple factor is 5%, and the value of the input inductance L1 is 19.6μH.

[0085] The input capacitance C1 is calculated as follows:

[0086] The voltage change of input capacitor C1 in one cycle is the same. When the link inductor is discharged, the voltage change of input capacitor C1 is for: , is the capacitive current when the link inductor is discharged; the voltage change when the input capacitor is discharged for , The time when the direction of the input capacitor current is the same as the direction of the input capacitor reference voltage; the voltage change when the input capacitor is charged during one cycle for , t charge The input capacitor charging time is sufficient to meet ; Solve to get the input capacitance C1. For example, take the longest charge and discharge cycle t charge =31μs, 18.2μs, I 1=200 t 2 / 3.1×10 -5 =63A, t 2=9.7μs, because the input capacitor C1 needs to stabilize to about 150V, =2V, the input capacitance C1 is solved to be 729μF.

[0087] Output inductance on the AC output side Lac Satisfies the following relationship: , is the voltage of the output inductor on the AC output side; is the current of the output inductor on the AC output side; is the voltage of the output capacitor on the AC output side; It is the AC output voltage provided to the AC load by the AC output side; is the duty cycle of the AC output on the AC output side; It is the current change of the output inductor on the AC output side when the link inductor discharge reaches the current peak The maximum value of , is the output power on the AC output side; , let the two equations be equal, and find the output inductance of the AC output side Lac ; For example, and The difference is 5.5V, is 0.28, T 9.8×10 -5 s, ripple factor is 5%, and we get Lac It is 137μH.

[0088] Output capacitor on the AC output side Cac Frequency The frequency is much smaller than the link inductance , usually in physics, a difference of more than 10 times can be considered to be much smaller than, so it satisfies , output capacitor on the AC output side Cac With output inductance Lac Angular frequency when resonance occurs ,have , after transformation, we get In this embodiment Cac is 46μF.

[0089] Output inductance on the DC output side Ld Satisfies the following relationship: , is the voltage of the output inductor on the DC output side, is the voltage of the output capacitor on the DC output side; It is the DC output voltage provided to the DC load by the DC output side; is the duty cycle of the DC output on the DC output side; is the current of the output inductor on the DC output side; The current change of the output inductor on the DC output side when the link inductor discharge reaches the current peak The maximum value of , , is the output power on the DC output side, and the output inductance on the DC output side is obtained by combining Ld ; For example, the same order and The difference is 5V, is 0.13, T 9.8×10 -5 s, ripple factor is 5%, and we get Ld is 64μH.

[0090] Output capacitor on DC output side Cdc Frequency The frequency is less than the link inductance ,satisfy , output capacitance on the DC output side Cdc With output inductor Cdc Angular frequency when resonance occurs ,have , after transformation, we get In this embodiment Cdc is 99μF.

[0091] Overall control strategy: Since the power on the input side and the output side is equal, the reference average current on the input side and the output side can be calculated, and the required link inductor peak current can be calculated by the reference average current , after combining formula 1 and formula 2, we get: , Formula 3; in the above formula, Move to the left and divide both sides by T ,get , Formula 4; the average current on the input and output sides is, , Formula 5, , Formula 6; Substituting Formula 5 into Formula 6, we get The expression is: ( ), formula 7; the input power expression is , Formula 8; Substituting Formula 5 into Formula 8 yields = L , Formula 9.

[0092] The DC input voltage on the input side of the DC-DC power transmission mode is constant. is also constant. Once the charging phase is obtained through Formula 7 , the charging time can be calculated by formula 1 , and then calculate the input power of the entire link cycle through formula 9, and further get the discharge time , after determining the charging time and discharging time, the conduction timing of each IGBT device can be controlled to obtain the DC output voltage. The AC output voltage of the DC-AC power transmission mode will change with time, so the obtained It also changes with time, but the control principle is similar to the control strategy at the DC output end, except that the charging and discharging time and the entire link cycle will change with time and are not constant.

[0093] The control strategy in the DC-DC-AC power transmission mode is quite different, because the discharge end is divided into two parts, so the calculation of the link peak current is also different. The calculation formula of the input end is the same as formula 1. The calculation formula of the link peak current at the output end is: , formula 10; , Formula 11, where is the total current discharged at the AC output side, is the discharge time of the AC side, The total discharge time of the DC output side is calculated by combining formula 5, formula 10 and formula 11, and dividing both sides by the parameter T ,get: , Formula 12, Substitute Formula 12 into Formula 1, and we get , Formula 13, separate the three numerators of Formula 13 and simplify them to get , Formula 14. Once it is determined , then the entire link cycle can be obtained, and then the charging time and the discharge time of the DC side and the AC side can be calculated, and the corresponding switch tube conduction signal can be given to obtain DC and AC outputs.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-output device that can be combined with a flexible battery, characterized in that: It includes a link inductor Link, an input unit, a first output unit and a second output unit; The link inductor Link is used as an energy storage element; The input end of the input unit is electrically connected to the power supply, and the output end of the input unit is electrically connected to both ends of the link inductor Link respectively; The input end of the first output unit is electrically connected to the two ends of the link inductor Link respectively, and the output end of the first output unit is electrically connected to the first load; The input end of the second output unit is electrically connected to the output end of the input unit respectively, and the output end of the second output unit is electrically connected to the second load; The link inductor Link outputs a DC signal or an AC signal to the first load during the discharge phase, or outputs a DC signal and an AC signal to the first load and the second load at the same time; The first output unit includes a plurality of IGBT devices, a first output inductor L2 and a first output capacitor C2; The source of the ninth IGBT device S9 is electrically connected to the source of the tenth IGBT device S10 and one end of the link inductor Link, respectively; the drain of the ninth IGBT device S9 is electrically connected to the drain of the eleventh IGBT device S11; the source of the eleventh IGBT device S11 is electrically connected to the source of the thirteenth IGBT device S13, one end of the first output inductor L2 and one end of the first output capacitor C2, respectively; the other end of the first output inductor L2 is electrically connected to one end of the first load; the drain of the thirteenth IGBT device S13 is electrically connected to the drain of the fifteenth IGBT device S15, and the source of the fifteenth IGBT device S15 is electrically connected to the drain of the link inductor Link, respectively. The other end is electrically connected to the source of the sixteenth IGBT device S16, the drain of the sixteenth IGBT device S16 is electrically connected to the drain of the fourteenth IGBT device S14, the source of the fourteenth IGBT device S14 is electrically connected to the other end of the first output capacitor C2, the other end of the first load and the source of the twelfth IGBT device S12, respectively, and the drain of the twelfth IGBT device S12 is electrically connected to the drain of the tenth IGBT device S10; the source of the ninth IGBT device S9 and the source of the fifteenth IGBT device serve as the input end of the first output unit; the other end of the first output inductor L2 and the other end of the first output capacitor C2 serve as the output end of the first output unit; The second output unit includes a second output inductor L3, a second output capacitor C3, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a fifth IGBT device S5, a sixth IGBT device S6, a seventh IGBT device S7 and an eighth IGBT device S8; the source of the fifth IGBT device S5 is electrically connected to the anode of the sixth diode D6 and the anode of the second diode D2 respectively; the drain of the fifth IGBT device S5 is electrically connected to the cathode of the fifth diode D5, the anode of the fifth diode D5 is electrically connected to the anode of the eighth diode D8, one end of the second output inductor L3 and one end of the second output capacitor C3 respectively, the other end of the second output inductor L3 is electrically connected to the anode of the eighth diode D8, ... the drain of the fifth IGBT device S5 is electrically connected to the cathode of the fifth diode D5, the anode of the fifth diode D5 is electrically connected to the anode of the eighth diode D8, the drain of the fifth IGBT device S5 is electrically connected to the cathode of the fifth diode D5, the drain of the fifth IGBT device S5 is electrically connected to the cathode of the eighth diode D8, the drain of the fifth IGBT device S5 is electrically connected to the cathode of the eighth diode D8, the drain of the fifth IGBT device S5 is electrically connected to the cathode of the eighth diode D8, the drain of the fifth IGBT device S5 is One end of the second load is electrically connected, the cathode of the eighth diode D8 is electrically connected to the drain of the eighth IGBT device S8, the source of the eighth IGBT device S8 is electrically connected to the anode of the seventh diode D7 and the anode of the third diode D3 respectively, the cathode of the seventh diode D7 is electrically connected to the source of the sixth IGBT device S6, the other end of the second output capacitor C3 and the other end of the second load respectively, the drain of the sixth IGBT device S6 is electrically connected to the cathode of the sixth diode D6; the source of the fifth IGBT device S5 and the source of the eighth IGBT device S8 serve as the input end of the second output unit; the other end of the second output inductor L3 and the other end of the second output capacitor C3 serve as the output end of the second output unit.

2. A dual-output device that can be combined with a flexible battery according to claim 1, characterized in that: The input unit includes an input inductor L1, an input capacitor C1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first IGBT device S1, a second IGBT device S2, a third IGBT device S3 and a fourth IGBT device S4; the anode of the first diode D1 is electrically connected to one end of the input inductor L1, one end of the input capacitor C1 and the anode of the fourth diode D4, respectively, and the other end of the input inductor is electrically connected to one end of the power supply; the cathode of the first diode D1 is electrically connected to the drain of the first IGBT device, the source of the first IGBT device is electrically connected to the anode of the second diode D2 and one end of the link inductor Link, respectively, and the second diode D2 The cathode of the second IGBT device S2 is electrically connected to the drain of the second IGBT device S2, the source of the second IGBT device S2 is electrically connected to the other end of the input capacitor C1, the other end of the power supply and the source of the third IGBT device S3, the drain of the third IGBT device S3 is electrically connected to the cathode of the third diode D3, the anode of the third diode D3 is electrically connected to the other end of the link inductor Link and the source of the fourth IGBT device S4, and the drain of the fourth IGBT device S4 is electrically connected to the cathode of the fourth diode D4; the other end of the input inductor L1 and the other end of the input capacitor C1 serve as the input end of the input unit; the anode of the second diode D2 and the anode of the third diode D3 serve as the output end of the input unit.

3. A dual-output device that can be combined with a flexible battery according to claim 1, characterized in that: A freewheeling diode is provided between the source and the drain of each IGBT device.

4. An output method of two output devices that can be combined with a flexible battery, characterized in that: The steps include: S1: configuring the two output devices that can be combined with the flexible battery as described in claim 3; S2: Implementing a DC-DC power transmission mode: In this mode, the first output unit outputs a DC signal as a DC output side; S21, forward charging: turn on the first IGBT device S1 and the third IGBT device S3, and the energy flows to the power supply, input inductor L1, input capacitor C1, first diode D1, first IGBT device S1, link inductor Link, third diode D3 and third IGBT device S3, so as to realize the forward charging of link inductor Link; after the forward charging stage is completed, turn off the first IGBT device S1 and the third IGBT device S3; S22, forward discharge: turn on the ninth IGBT device S9 and the fourteenth IGBT device S14, and the energy flows to the link inductor Link, the freewheeling diode of the sixteenth IGBT device S16, the fourteenth IGBT device, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the eleventh IGBT device S11 and the ninth IGBT device S9, and the link inductor Link outputs a DC signal to the first load; after the forward discharge is completed, turn off the ninth IGBT device S9 and the fourteenth IGBT device S14; S23, reverse charging: turn on the second IGBT device S2 and the fourth IGBT device S4, and the energy flows to the power supply, input inductor L1, input capacitor C1, fourth diode D4, fourth IGBT device S4, link inductor Link, second diode D2 and second IGBT device S2; after reverse charging is completed, turn off the second IGBT device S2 and the fourth IGBT device S4; S24, reverse discharge: turn on the twelfth IGBT device S12 and the fifteenth IGBT device S15, and the energy flows to the link inductor Link, the freewheeling diode of the tenth IGBT device S10, the twelfth IGBT device, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the thirteenth IGBT device S13 and the fifteenth IGBT device S15, and the link inductor Link outputs a DC signal to the first load; after the reverse discharge is completed, turn off the twelfth IGBT device S12 and the fifteenth IGBT device S15; S3: Implementing a DC-AC power transmission mode: In this mode, the first output unit outputs an AC signal as an AC output side; S31, forward charging: the implementation process is exactly the same as step S21; S32, forward discharge: in the first half cycle of the output alternating signal, the ninth IGBT device S9 and the fourteenth IGBT device S14 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the sixteenth IGBT device S16, the fourteenth IGBT device S14, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the eleventh IGBT device S11 and the ninth IGBT device S9, and then the ninth IGBT device S9 and the fourteenth IGBT device S14 are turned off; in the second half cycle of the output alternating signal, the tenth IGBT device S10 and the thirteenth IGBT device S13 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the fifteenth IGBT device S15, the thirteenth IGBT device S13, the first output inductor L2, the first output capacitor C2, the first load, the freewheeling diode of the twelfth IGBT device S12 and the tenth IGBT device S10, and then the tenth IGBT device S10 and the thirteenth IGBT device S13 are turned off; S33, reverse charging: the implementation process is exactly the same as step S23; S34, reverse discharge: in the first half cycle of outputting the alternating signal, the twelfth IGBT device S12 and the fifteenth IGBT device S15 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the tenth IGBT device S10, the twelfth IGBT device S12, the first output capacitor C2, the first load, the first output inductor L2, the freewheeling diode of the thirteenth IGBT device S13 and the fifteenth IGBT device S15, and then the twelfth IGBT device S12 and the fifteenth IGBT device S15 are turned off; in the second half cycle of outputting the alternating signal, the eleventh IGBT device S11 and the sixteenth IGBT device S16 are turned on, and the energy flows to the link inductor Link, the freewheeling diode of the ninth IGBT device S9, the eleventh IGBT device S11, the first output capacitor C2, the first output inductor L2, the first load, the freewheeling diode of the fourteenth IGBT device and the sixteenth IGBT device S16, and then the eleventh IGBT device S11 and the sixteenth IGBT device S16 are turned off; S4: Implementing a DC-DC-AC power transmission mode: In this mode, the second output unit outputs a DC signal as a DC output side, and the first output unit outputs an AC signal as an AC output side; S41; Forward charging: the implementation process is exactly the same as step S21; S42: DC end discharge: turn on the fifth IGBT device S5 and the seventh IGBT device S7, and the energy flows to the link inductor Link, the seventh diode D7, the seventh IGBT device S7, the second output capacitor C3, the second load, the second output inductor L3, the fifth diode D5 and the fifth IGBT device S5, and then turn off the fifth IGBT device S5 and the seventh IGBT device S7; S43: Discharging at the AC end: the remaining current after the DC end is discharged is discharged to the AC output end, and the energy flow direction is the same as step S32; S44: Reverse charging: the implementation process is exactly the same as step S23; S45: DC end discharge: turn on the sixth IGBT device S6 and the eighth IGBT device S8, and the energy flows to the link inductor Link, the sixth diode D6, the sixth IGBT device S6, the second output capacitor C3, the second load, the second output inductor L3, the eighth diode D8 and the eighth IGBT device S8, and then turn off the sixth IGBT device S6 and the eighth IGBT device S8; S46: Discharging at the AC end: After discharging at the DC end, the remaining current is discharged to the AC output end, and the energy flow direction is the same as step S32.

5. The output method of two output devices combined with a flexible battery according to claim 4, characterized in that: The parameter calculation formula of link inductance Link is as follows: ,in is the input voltage of the power supply; forward charging time 0.29 t , t A link cycle includes two charge and discharge cycles: forward charge and discharge and reverse charge and discharge; is the peak current at the link inductor output.

6. The output method of two output devices combined with a flexible battery according to claim 5, characterized in that: The input inductor L1 satisfies the following relationship: , ,in is the voltage across the input inductor L1; is the current of the input inductor L1; is the voltage of input capacitor C1; D is the on-duty ratio, T is the time corresponding to a cycle, DT is the conduction time of the input terminal in one cycle, is the current change of the input inductor when the current on the link inductor reaches its peak value, is the current change of the input inductor when the current on the link inductor reaches its peak value, ; for The maximum value of , is the input power of the power supply, is the ripple factor, and the input inductance L1 is obtained by calculation; The input capacitance C1 is calculated as follows: The voltage change of input capacitor C1 in one cycle is the same. When the link inductor is discharged, the voltage change of input capacitor C1 is for: , is the capacitive current when the link inductor is discharged; is the total discharge time in one cycle; The voltage change when the input capacitor is discharged for , The time when the direction of the input capacitor current is the same as the direction of the input capacitor reference voltage; The voltage change when the input capacitor is charged in one cycle for , t charge The input capacitor charging time is sufficient to meet ; Solve to obtain the input capacitance C1.

7. The output method of two output devices combined with a flexible battery according to claim 6, characterized in that: Output inductance on the AC output side Lac Satisfies the following relationship: , is the voltage of the output inductor on the AC output side; is the current of the output inductor on the AC output side; is the voltage of the output capacitor on the AC output side; It is the AC output voltage provided to the AC load by the AC output side; is the duty cycle of the AC output on the AC output side; It is the current change of the output inductor on the AC output side when the link inductor discharge reaches the current peak The maximum value of , is the output power on the AC output side; , let the two formulas and Equal, find the output inductance of the AC output side Lac ; Output capacitor on the AC output side Cac Frequency The frequency is less than the link inductance ,satisfy , output capacitor on the AC output side Cac With output inductor Lac Angular frequency when resonance occurs ,have , after transformation, we get .

8. The output method of two output devices combined with a flexible battery according to claim 6, characterized in that: Output inductance on the DC output side Ld Satisfies the following relationship: , is the voltage of the output inductor on the DC output side, is the voltage of the output capacitor on the DC output side; It is the DC output voltage provided to the DC load by the DC output side; is the duty cycle of the DC output on the DC output side; is the current of the output inductor on the DC output side; The current change of the output inductor on the DC output side when the link inductor discharge reaches the current peak The maximum value of , , is the output power on the DC output side, and the output inductance on the DC output side is obtained by combining Ld ; Output capacitor on DC output side Cdc Frequency The frequency is less than the link inductance ,satisfy , output capacitance on the DC output side Cdc With output inductor Ld Angular frequency when resonance occurs ,have , after transformation, we get .

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