CN111371317B - Extensible non-isolated dual-input boost direct-current converter - Google Patents

Extensible non-isolated dual-input boost direct-current converter Download PDF

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CN111371317B
CN111371317B CN202010293006.8A CN202010293006A CN111371317B CN 111371317 B CN111371317 B CN 111371317B CN 202010293006 A CN202010293006 A CN 202010293006A CN 111371317 B CN111371317 B CN 111371317B
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diode
capacitor
expansion
input
power supply
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CN111371317A (en
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林国庆
林思圻
卢凯
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Fuzhou University
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Fuzhou University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to an extensible non-isolated dual-input boost direct-current converter. The load circuit comprises a first input port, a second input port, a load port, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a load. The non-isolated dual-input boost direct current converter has three working modes, can complete the boost functions of independent power supply of two inputs and simultaneous power supply of two paths in one converter, and can further improve the boost ratio of the converter by adding an expansion unit on the output side.

Description

Extensible non-isolated dual-input boost direct-current converter
Technical Field
The invention relates to the technical field of power electronics, in particular to an extensible non-isolated dual-input boost direct-current converter.
Background
With the increasing exhaustion of traditional fossil energy and the problems of environmental pollution and global warming caused by the traditional fossil energy, the development and utilization of new energy are more and more paid attention by people. At present, photovoltaic power generation, wind power generation, fuel cell power generation and the like are mainly used as new energy power generation modes, but due to the fact that the limitation of weather conditions is large, the power supply is unstable and discontinuous, the power supply changes along with environmental conditions and the like, and the load cannot be guaranteed to obtain enough energy. Therefore, a plurality of new energy power generation forms need to be combined to form a new energy combined power supply system.
In a conventional new energy combined power supply system, each energy form generally needs a DC-DC converter to convert various energy sources into direct current output, and the direct current output is connected in parallel to a common direct current bus, so that the structure is complex and the cost is high. In order to simplify the circuit structure and reduce the system cost, one multi-input DC converter can be used to replace a plurality of single-input DC converters, a plurality of input sources are allowed to supply power to the load by connecting a plurality of input sources and a single load, and the multi-input sources can supply power to the load respectively or simultaneously. In addition, the voltage of the direct current bus cannot be met due to the limitation of lower output voltage of a photovoltaic cell and the like, and the traditional Boost converter is not suitable for use due to the excessively high voltage difference. Therefore, the research on how to enable the direct current converter to have high gain and multi-input capability has important significance on a new energy power generation system.
Disclosure of Invention
The invention aims to provide an extensible non-isolated double-input boost direct-current converter, which has three working modes, can complete the boost functions of independent power supply of two inputs and simultaneous power supply of two paths in one converter, and can further improve the boost ratio of the converter by adding an expansion unit on the output side.
In order to achieve the purpose, the technical scheme of the invention is as follows: a scalable non-isolated dual-input boost direct current converter comprises a first input power supply, a second input power supply, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a load; the positive pole of the first input power supply is connected with one end of a first inductor and one end of a first capacitor, the negative pole of the first input power supply is connected with the negative pole of a second input power supply, the source electrode of a first switch tube, the source electrode of a second switch tube, one end of a fourth capacitor and one end of a load, the positive pole of the second input power supply is connected with the drain electrode of the second switch tube, the anode of a third diode and one end of a third capacitor through a second inductor, the drain electrode of the first switch tube is connected with the other end of the first inductor, one end of a second capacitor and the anode of a first diode, the cathode of the first diode is connected with the other end of the first capacitor and the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, the anode of the fourth diode and the other end of the second capacitor, the cathode of the fourth diode is connected with the other end of the third capacitor and the anode of the fifth diode, and the cathode of the fifth diode is connected with the other end of the fourth capacitor and the other end of the load.
In an embodiment of the present invention, the non-isolated dual-input boost dc converter has three operation modes, that is, a boost function with two inputs supplying power separately and a boost function with two inputs supplying power simultaneously can be completed in one converter, and the boost ratio of the converter can be further improved by adding an expansion unit on the output side.
In an embodiment of the present invention, the non-isolated dual-input boost dc-dc converter has three operation modes, which are as follows:
(1) two inputs are simultaneously powered: the first switch tube and the second switch tube work in a staggered mode, driving signals of the two switch tubes are overlapped with each other, and the work duty ratio of the first switch tube is D1The duty ratio of the second switching tube is D2If the output voltage of the non-isolated dual-input boost direct-current converter is greater than the reference voltage, the output voltage of the non-isolated dual-input boost direct-current converter is:
Figure BDA0002450994840000021
in the formula, Vin1Is a first input supply voltage, Vin2Is a second input supply voltage;
(2) the first input power supply independent power supply mode comprises the following steps: the second switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure BDA0002450994840000022
(3) the second input power supply independent power supply mode comprises: the first switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure BDA0002450994840000023
the invention also provides an expandable non-isolated dual-input boost direct current converter, which comprises a first input power supply, a second input power supply, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a load and N expansion units, wherein the second end of the 1 st expansion unit is connected with the first end of the 2 nd expansion unit, the second end of the i expansion unit is connected with the first end of the i +1 th expansion unit, the second end of the N-1 th expansion unit is connected with the first end of the N expansion unit, i is more than 1 and less than N-1, and N is more than 1; the positive pole of a first input power supply is connected with one end of a first inductor and one end of a first capacitor, the negative pole of the first input power supply is connected with the negative pole of a second input power supply, the source electrode of a first switching tube, the source electrode of a second switching tube, one end of a fourth capacitor and one end of a load, the positive pole of a second input power supply is connected with the drain electrode of a second switching tube, the anode of a third diode, one end of a third capacitor and the third ends of N expansion units through a second inductor, the drain electrode of the first switching tube is connected with the other end of the first inductor, one end of the second capacitor, the anode of a first diode and the fourth ends of the N expansion units, the cathode of the first diode is connected with the other end of the first capacitor and the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, the anode of the fourth diode and the other end of the second capacitor, the cathode of the fourth diode is connected with the other end of the third capacitor, The first end of the first extension unit is connected, the second end of the Nth extension unit is connected with the anode of the fifth diode, and the cathode of the fifth diode is connected with the other end of the fourth capacitor and the other end of the load.
In an embodiment of the invention, when there is no extension unit, the cathode of the fourth diode and the other end of the third capacitor are directly connected to the anode of the fifth capacitor.
In an embodiment of the present invention, when there is only one expansion unit, the expansion unit includes a first expansion diode, a second expansion diode, a first expansion capacitor, and a second expansion capacitor, an anode of the first expansion diode is used as a first end of the expansion unit, a cathode of the first expansion diode is connected to an anode of the second expansion diode and one end of the first expansion capacitor, a cathode of the second expansion diode is connected to one end of the second expansion capacitor and is used as a second end of the expansion unit, another end of the first expansion capacitor is used as a fourth end of the expansion unit, another end of the second expansion capacitor is used as a third end of the expansion unit, the first end of the expansion unit is connected to a cathode of the fourth diode and another end of the third capacitor, the second end of the expansion unit is connected to an anode of the fifth diode, and the third end of the expansion unit is connected to one end of the third capacitor, and the fourth end of the expansion unit is connected with one end of the second capacitor.
In an embodiment of the present invention, each expansion unit includes a first expansion diode, a second expansion diode, a first expansion capacitor, and a second expansion capacitor, an anode of the first expansion diode is used as a first end of the expansion unit, a cathode of the first expansion diode is connected to an anode of the second expansion diode and one end of the first expansion capacitor, a cathode of the second expansion diode is connected to one end of the second expansion capacitor and is used as a second end of the expansion unit, another end of the first expansion capacitor is used as a fourth end of the expansion unit, and another end of the second expansion capacitor is used as a third end of the expansion unit.
In an embodiment of the present invention, the non-isolated dual-input boost dc-dc converter has three operation modes, which are as follows:
(1) two inputs are simultaneously powered: the first switch tube and the second switch tube work in a staggered mode, driving signals of the two switch tubes are overlapped with each other, and the work duty ratio of the first switch tube is D1The duty ratio of the second switching tube is D2If the output voltage of the non-isolated dual-input boost direct-current converter is greater than the reference voltage, the output voltage of the non-isolated dual-input boost direct-current converter is:
Figure BDA0002450994840000031
in the formula, Vin1Is the first inputInto the supply voltage, Vin2Is the second input power voltage, N is the number of the expansion units;
(2) the first input power supply independent power supply mode comprises the following steps: the second switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure BDA0002450994840000041
(3) the second input power supply independent power supply mode comprises: the first switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure BDA0002450994840000042
compared with the prior art, the invention has the following beneficial effects: the direct current converter has three working modes, can complete the boosting functions of independent power supply of two inputs and simultaneous power supply of two paths in one converter, and can further improve the boosting ratio of the converter by adding an expansion unit on the output side.
Drawings
Fig. 1 is a non-isolated dual input boost dc-dc converter of the present invention.
Fig. 2 shows the main operating waveforms of the circuit when two paths of power are supplied simultaneously.
FIG. 3 is a drawing showing
Figure BDA0002450994840000043
The equivalent circuit diagram of each mode is shown.
FIG. 4 is a drawing showing
Figure BDA0002450994840000044
The equivalent circuit diagram of each mode is shown.
Fig. 5 is a waveform diagram of the main operation of the circuit when the input port 1 is supplied with power alone.
Fig. 6 is an equivalent circuit diagram of each mode when the input port 1 is independently powered.
Fig. 7 is a waveform diagram of the main operation of the circuit when the input port 2 is solely powered.
Fig. 8 is an equivalent circuit diagram of each mode when the input port 2 is separately supplied with power.
Fig. 9 is a circuit diagram of an expansion circuit of the non-isolated dual-input boost dc converter of the present invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides an extensible non-isolated double-input boost direct current converter which comprises a first input power supply, a second input power supply, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a load, wherein the first diode, the second diode, the third diode, the fourth diode, the fifth diode, the first diode, the second diode, the third diode, the fourth diode and the load are connected in series; the positive pole of the first input power supply is connected with one end of a first inductor and one end of a first capacitor, the negative pole of the first input power supply is connected with the negative pole of a second input power supply, the source electrode of a first switch tube, the source electrode of a second switch tube, one end of a fourth capacitor and one end of a load, the positive pole of the second input power supply is connected with the drain electrode of the second switch tube, the anode of a third diode and one end of a third capacitor through a second inductor, the drain electrode of the first switch tube is connected with the other end of the first inductor, one end of a second capacitor and the anode of a first diode, the cathode of the first diode is connected with the other end of the first capacitor and the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, the anode of the fourth diode and the other end of the second capacitor, the cathode of the fourth diode is connected with the other end of the third capacitor and the anode of the fifth diode, and the cathode of the fifth diode is connected with the other end of the fourth capacitor and the other end of the load. The non-isolated dual-input boost direct current converter has three working modes, namely, a boost function of independently supplying power by two inputs and a boost function of simultaneously supplying power by two inputs can be completed in one converter, and the boost ratio of the converter can be further improved by adding an expansion unit on the output side.
The invention also provides an expandable non-isolated dual-input boost direct current converter, which comprises a first input power supply, a second input power supply, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a load and N expansion units, wherein the second end of the 1 st expansion unit is connected with the first end of the 2 nd expansion unit, the second end of the i expansion unit is connected with the first end of the i +1 th expansion unit, the second end of the N-1 th expansion unit is connected with the first end of the N expansion unit, i is more than 1 and less than N-1, and N is more than 1; the positive pole of a first input power supply is connected with one end of a first inductor and one end of a first capacitor, the negative pole of the first input power supply is connected with the negative pole of a second input power supply, the source electrode of a first switching tube, the source electrode of a second switching tube, one end of a fourth capacitor and one end of a load, the positive pole of a second input power supply is connected with the drain electrode of a second switching tube, the anode of a third diode, one end of a third capacitor and the third ends of N expansion units through a second inductor, the drain electrode of the first switching tube is connected with the other end of the first inductor, one end of the second capacitor, the anode of a first diode and the fourth ends of the N expansion units, the cathode of the first diode is connected with the other end of the first capacitor and the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, the anode of the fourth diode and the other end of the second capacitor, the cathode of the fourth diode is connected with the other end of the third capacitor, The first end of the first extension unit is connected, the second end of the Nth extension unit is connected with the anode of the fifth diode, and the cathode of the fifth diode is connected with the other end of the fourth capacitor and the other end of the load.
When the extension unit is not arranged, the cathode of the fourth diode and the other end of the third capacitor are directly connected with the anode of the fifth capacitor.
When only one extension unit is provided, the extension unit comprises a first extension diode, a second extension diode, a first extension capacitor and a second extension capacitor, wherein the anode of the first extension diode is used as the first end of the extension unit, the cathode of the first extension diode and the anode of the second extension diode, one end of the first extension capacitor is connected, the cathode of the second extension diode is connected with one end of the second extension capacitor and serves as the second end of the extension unit, the other end of the first extension capacitor serves as the fourth end of the extension unit, the other end of the second extension capacitor serves as the third end of the extension unit, the first end of the extension unit is connected with the cathode of the fourth diode and the other end of the third capacitor, the second end of the extension unit is connected with the anode of the fifth diode, the third end of the extension unit is connected with one end of the third capacitor, and the fourth end of the extension unit is connected with one end of the second capacitor.
When the number of the extension units is larger than or equal to 2, each extension unit comprises a first extension diode, a second extension diode, a first extension capacitor and a second extension capacitor, wherein the anode of the first extension diode is used as the first end of the extension unit, the cathode of the first extension diode is connected with the anode of the second extension diode and one end of the first extension capacitor, the cathode of the second extension diode is connected with one end of the second extension capacitor and is used as the second end of the extension unit, the other end of the first extension capacitor is used as the fourth end of the extension unit, and the other end of the second extension capacitor is used as the third end of the extension unit.
The following is a specific implementation of the present invention.
As shown in fig. 1, the present invention provides a scalable non-isolated dual-input boost dc-dc converter, which includes a first input power supply, a second input power supply, a first switch transistor, a second switch transistor, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a load.
The expandable non-isolated dual-input boost direct-current converter has three working modes:
the non-isolated double-input boost direct-current converter has three working modes, can complete the boost functions of two-input single power supply and two-path simultaneous power supply in one converter, and can further improve the boost ratio of the converter by adding an expansion unit on the output side.
1) Two-input common power supply mode: switch tube S1And a switching tube S2The two switch tubes are in staggered work, the driving signals of the two switch tubes are mutually overlapped, and the switch tube S1Duty cycle of D1Switching tube S2Duty cycle of D2Then, the magnitude of the converter output voltage is:
Figure BDA0002450994840000061
the output voltage of the expanded converter is as follows:
Figure BDA0002450994840000062
wherein N is the number of extension units.
2) Input 1 individual power mode: switch tube S2Always off, S1Duty cycle of D1Then, the magnitude of the converter output voltage is:
Figure BDA0002450994840000063
the output voltage of the expanded converter is as follows:
Figure BDA0002450994840000064
3) input 2 individual power mode: switch tube S1Always kept on, S2Duty cycle of D2Then, the magnitude of the converter output voltage is:
Figure BDA0002450994840000071
the extended converter output voltage is then:
Figure BDA0002450994840000072
the specific working principle of the expandable non-isolated dual-input boost direct-current converter is as follows:
the non-isolated dual-input boost direct-current converter has three working modes, and the working principle of each mode is as follows:
1. input 1 and input 2 simultaneous power mode
Switch tube S1And a switching tube S2The circuit works in a staggered mode, driving signals of the two switching tubes are overlapped, the main working waveforms of the circuit are shown in figure 2, and the circuit is divided into two working conditions.
1) When two paths of input voltage and two switching tubes work duty ratio meet
Figure BDA0002450994840000073
Time, output voltage
Figure BDA0002450994840000074
The circuit has four working modes in one switching period, and the equivalent circuit of each mode is shown in figure 3.
(a) Mode 1 (t)0-t1)：t0At any moment, switch tube S1、S2Are all conducted, Vin1Through a switching tube S1To the inductance L1Charging, Vin2Through a switching tube S2To the inductance L2Charging, inductance L1And L2The current of (1) rises linearly, the diode VD1～VD5All reverse cut-off, output capacitance CoPower is supplied to the load.
(b) Mode 2 (t)1-t2)：t1At any moment, switch tube S2Cut off and switch tube S1Continues to be conducted, and the inductance L1The current continues to rise linearly; inductor L2Follow current, Vin2And an inductance L2Together through a diode VD3Switch tube S1To the capacitor C2Charging; vin2And an inductance L2Capacitor C3Are connected in series through a diode VD5Capacitor CoCharging and powering the load.
(c) Mode 3 (t)2-t3): switch tube S1、S2Are all turned on, this stage andat (t)0-t1) The working modes of the phase circuits are consistent.
(d) Mode 4 (t)3-t4)：t3At any moment, switch tube S1Cut off and switch tube S2Continues to be conducted, and the inductance L1Follow current, Vin1And an inductance L1Capacitor C2Are connected in series through a diode VD4And a switching tube S2Capacitor C3Charging; vin2Through a switching tube S2To the inductance L2Continuing to charge; diode VD5Reverse cut-off, output capacitance CoPower is supplied to the load.
In this supply mode, the inductor L1And L2The volt-second equilibrium can be obtained:
Figure BDA0002450994840000075
then the capacitor voltage
Figure BDA0002450994840000076
Output voltage of converter
Figure BDA0002450994840000077
2) When two paths of input power supply voltages and two switching tube work duty ratios meet
Figure BDA0002450994840000081
Time, output voltage
Figure BDA0002450994840000082
The circuit also has four working modes in one switching period, and the equivalent circuit of each mode is shown in figure 4.
(a) Mode 1 (t)0-t1)：t0At any moment, switch tube S1、S2Are all conducted, Vin1Through a switching tube S1To the inductance L1Charging, Vin2Through a switching tube S2To the inductance L2Charging of electricityInductance L1And L2The current of (2) rises linearly; vin1And a capacitor C1Together through a diode VD2Switch tube S1To the capacitor C2Charging and output capacitor CoPower is supplied to the load.
(b) Mode 2 (t)1-t2)：t1At any moment, switch tube S2Cut off and switch tube S1Continues to be conducted, and the inductance L1The current continues to rise linearly, Vin1And a capacitor C1Together through a diode VD2Switch tube S1To the capacitor C2Charging; inductor L2Follow current, Vin2And an inductance L2Capacitor C3Are connected in series through a diode VD5To an output capacitor CoCharging and powering the load.
(c) Mode 3 (t)2-t3): switch tube S1、S2Are all turned on, this stage and at (t)0-t1) The working modes of the phase circuits are consistent.
(d) Mode 4 (t)3-t4)：t3Time switch tube S1Cut off and switch tube S2Continues to be conducted, and the inductance L1Follow current through diode VD1Capacitor C1Charging; at the same time Vin1And an inductance L1Capacitor C2Are connected in series through a diode VD4Switch tube S2Capacitor C3Charging; diode VD5Reverse cut-off, output capacitance CoPower is supplied to the load.
In this supply mode, the inductor L1And L2The volt-second balance can be obtained
Figure BDA0002450994840000083
And has the following components: vin1+VC1＝VC2
The capacitor voltage can be obtained
Figure BDA0002450994840000084
Output voltage of converter
Figure BDA0002450994840000085
2. Input port 1 individual power mode
Switching tube S in this mode2Is always turned off, and the circuit is a switching tube S1Diode VD1、VD2、VD4And VD5Inductance L1And a capacitor C1、C2And C0The output voltage of the DC converter with high step-up ratio
Figure BDA0002450994840000086
The waveform of the control signal of the switching tube is shown in fig. 5, the converter has two working modes in one switching period, and the equivalent circuit of each mode is shown in fig. 6.
(a) Mode 1 (t)0～t1): when switching tube S1When conducting, Vin1Through a switching tube S1To the inductance L1Charging, Vin1And a capacitor C1Series pass diode VD2Switch tube S1To the capacitor C2And (6) charging.
(b) Mode 2 (t)1～t2): when switching tube S1When turned off, the inductance L1Follow current through diode VD1Capacitor C1Charging; inductor L1And Vin1And a capacitor C2Are connected in series through VD4、VD5Capacitor CoCharging and supplying power to the load, achieving high gain.
By an inductance L1And L2The voltage of the capacitor under the power supply mode can be obtained by volt-second balance
Figure BDA0002450994840000091
Output voltage of converter
Figure BDA0002450994840000092
3. Input port 2 individual power mode
Switching tube S in this mode1Always kept on, the circuit is a switch tube S2Diode VD3、VD4、VD5Inductance L2And a capacitor C2、C3And CoThe output voltage of the DC converter with high step-up ratio
Figure BDA0002450994840000093
The waveform of the control signal of the switching tube is shown in fig. 7, the converter has two working modes in one switching period, and the equivalent circuit of each mode is shown in fig. 8.
(a) Mode 1 (t)0-t1): when S is2When conducting, Vin2Through a switching tube S2To the inductance L2Charging, capacitance C2Through a diode VD4Switch tube S1、S2To the capacitor C3Charging; diode VD5Reverse cut-off, output capacitance CoPower is supplied to the load.
(b) Mode 2 (t)1-t2): when S is2When turned off, the inductance L2Follow current, Vin2And an inductance L2Together through a diode VD3Switch tube S1Capacitor C2Charging; vin2And an inductance L2A capacitor C3 connected in series through a diode VD5To an output capacitor CoCharging and powering the load.
By an inductance L1And L2The voltage of the capacitor under the power supply mode can be obtained by volt-second balance
Figure BDA0002450994840000094
Output voltage of converter
Figure BDA0002450994840000095
The non-isolated double-input boost direct current converter can complete the functions of two single-input single-output converters in one converter, and can realize simultaneous power supply of two paths. In addition, the converter can further improve the boost ratio of the converter by adding an expansion unit on the output side, and the expansion circuit diagram is shown in fig. 9.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.

Claims (5)

1. A scalable non-isolated dual-input boost direct current converter is characterized by comprising a first input power supply, a second input power supply, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a load; the positive pole of the first input power supply is connected with one end of a first inductor and one end of a first capacitor, the negative pole of the first input power supply is connected with the negative pole of a second input power supply, the source electrode of a first switch tube, the source electrode of a second switch tube, one end of a fourth capacitor and one end of a load, the positive pole of the second input power supply is connected with the drain electrode of the second switch tube, the anode of a third diode and one end of a third capacitor through a second inductor, the drain electrode of the first switch tube is connected with the other end of the first inductor, one end of a second capacitor and the anode of a first diode, the cathode of the first diode is connected with the other end of the first capacitor and the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, the anode of the fourth diode and the other end of the second capacitor, the cathode of the fourth diode is connected with the other end of the third capacitor and the anode of the fifth diode, the cathode of the fifth diode is connected with the other end of the fourth capacitor and the other end of the load; the non-isolated dual-input boost direct current converter has three working modes, namely a boost function of independently supplying power by two inputs and a boost function of simultaneously supplying power by two inputs can be completed in one converter, and the boost ratio of the converter can be further improved by adding an expansion unit on the output side; the method comprises the following specific steps:
(1) two inputs are simultaneously powered: the first switch tube and the second switch tube work in a staggered way, and the two switch tubes driveThe signals are mutually overlapped, the duty ratio of the first switch tube is D1The duty ratio of the second switching tube is D2If the output voltage of the non-isolated dual-input boost direct-current converter is greater than the reference voltage, the output voltage of the non-isolated dual-input boost direct-current converter is:
Figure FDA0002957354990000011
in the formula, Vin1Is a first input supply voltage, Vin2Is a second input supply voltage;
(2) the first input power supply independent power supply mode comprises the following steps: the second switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure FDA0002957354990000012
(3) the second input power supply independent power supply mode comprises: the first switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure FDA0002957354990000013
2. a scalable non-isolated dual-input boost direct current converter is characterized by comprising a first input power supply, a second input power supply, a first switch tube, a second switch tube, a first inductor, a second inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a load and N expansion units, wherein the second end of the 1 st expansion unit is connected with the first end of the 2 nd expansion unit, the second end of the i th expansion unit is connected with the first end of the i +1 th expansion unit, the second end of the N-1 th expansion unit is connected with the first end of the N expansion unit, i is more than 1 and less than N-1, and N is more than 1; the positive pole of a first input power supply is connected with one end of a first inductor and one end of a first capacitor, the negative pole of the first input power supply is connected with the negative pole of a second input power supply, the source electrode of a first switching tube, the source electrode of a second switching tube, one end of a fourth capacitor and one end of a load, the positive pole of a second input power supply is connected with the drain electrode of a second switching tube, the anode of a third diode, one end of a third capacitor and the third ends of N expansion units through a second inductor, the drain electrode of the first switching tube is connected with the other end of the first inductor, one end of the second capacitor, the anode of a first diode and the fourth ends of the N expansion units, the cathode of the first diode is connected with the other end of the first capacitor and the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, the anode of the fourth diode and the other end of the second capacitor, the cathode of the fourth diode is connected with the other end of the third capacitor, The first end of the first extension unit is connected, the second end of the Nth extension unit is connected with the anode of a fifth diode, and the cathode of the fifth diode is connected with the other end of the fourth capacitor and the other end of the load; the non-isolated dual-input boost direct-current converter has three working modes, specifically as follows:
(1) two inputs are simultaneously powered: the first switch tube and the second switch tube work in a staggered mode, driving signals of the two switch tubes are overlapped with each other, and the work duty ratio of the first switch tube is D1The duty ratio of the second switching tube is D2If the output voltage of the non-isolated dual-input boost direct-current converter is greater than the reference voltage, the output voltage of the non-isolated dual-input boost direct-current converter is:
Figure FDA0002957354990000021
in the formula, Vin1Is a first input supply voltage, Vin2Is the second input power voltage, N is the number of the expansion units;
(2) the first input power supply independent power supply mode comprises the following steps: the second switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure FDA0002957354990000022
(3) the second input power supply independent power supply mode comprises: the first switch tube keeps being turned off, and the output voltage of the non-isolated dual-input boost direct-current converter is as follows:
Figure FDA0002957354990000023
3. the scalable non-isolated dual-input boost DC converter according to claim 2, wherein when there is no expansion unit, the cathode of the fourth diode and the other end of the third capacitor are directly connected to the anode of the fifth capacitor.
4. The scalable non-isolated dual-input boost DC converter according to claim 2, wherein when there is only one expansion unit, the expansion unit comprises a first expansion diode, a second expansion diode, a first expansion capacitor and a second expansion capacitor, an anode of the first expansion diode is used as a first end of the expansion unit, a cathode of the first expansion diode is connected with an anode of the second expansion diode and one end of the first expansion capacitor, a cathode of the second expansion diode is connected with one end of the second expansion capacitor and is used as a second end of the expansion unit, the other end of the first expansion capacitor is used as a fourth end of the expansion unit, the other end of the second expansion capacitor is used as a third end of the expansion unit, the first end of the expansion unit is connected with a cathode of the fourth diode and the other end of the third capacitor, and the second end of the expansion unit is connected with an anode of the fifth diode, and the third end of the expansion unit is connected with one end of a third capacitor, and the fourth end of the expansion unit is connected with one end of a second capacitor.
5. The scalable non-isolated dual-input boost DC converter according to claim 2, wherein each of the expansion units comprises a first expansion diode, a second expansion diode, a first expansion capacitor and a second expansion capacitor, an anode of the first expansion diode is used as a first end of the expansion unit, a cathode of the first expansion diode is connected with an anode of the second expansion diode and one end of the first expansion capacitor, a cathode of the second expansion diode is connected with one end of the second expansion capacitor and is used as a second end of the expansion unit, the other end of the first expansion capacitor is used as a fourth end of the expansion unit, and the other end of the second expansion capacitor is used as a third end of the expansion unit.
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