阅读说明：本技术 一种具有多个基础单元的Boost DC-DC变换器 (Boost DC-DC converter with multiple basic units ) 是由 邾玢鑫 王慧慧 张耀 佘小莉 杨浴金 于 2020-04-30 设计创作，主要内容包括：一种具有多个基础单元的Boost DC-DC变换器,该DC-DC变换器包括一个输入电源,一个负载<I>R</I><Sub>L</Sub>,一个基本Boost DC-DC变换器,<I>n</I>个基础单元；所述基本Boost DC-DC变换器包含一个电感<I>L</I><Sub>1</Sub>,一个电容<I>C</I><Sub>1</Sub>,一个功率开关S<Sub>1</Sub>,一个二极管D<Sub>1</Sub>。本发明DC-DC变换器仅含有一个功率开关,控制策略及驱动电路简单；并具有输入输出电压调节范围宽、开关器件电压应力等优势,较适合于输入输出增益高或变化范围大的应用场合。(A Boost DC-DC converter with multiple basic units comprises an input power supply, a load R L A basic Boost DC-DC converter, n a base unit; the basic Boost DC-DC converter comprises an inductor L 1 A capacitor C 1 A power switch S 1 A diode D 1 . The DC-DC converter only comprises one power switch, and the control strategy and the driving circuit are simple; the method has the advantages of wide input and output voltage regulation range, voltage stress of a switching device and the like, and is suitable for application occasions with high input and output gains or large variation range.)

1. A Boost DC-DC converter having a plurality of base units, the DC-DC converter comprising:

an input power supply, a load R_LA basic Boost DC-DC converter, n basic units;

the basic Boost DC-DC converter comprises an inductor L₁A capacitor C₁A power switch S₁A diode D₁(ii) a The connection form is as follows:

inductor L₁One end of which is connected with the anode of the input power supply, an inductor L₁Are respectively connected with a power switch S₁Drain electrode of (2), diode D₁Anode of (2), capacitor C₁And a diode D₁Is connected to the cathode of the power switch S₁Source electrode and capacitor C₁The other ends of the two-phase current transformer are connected with the negative electrode of the input power supply;

the components and the internal connection forms of the n basic units are the same,

the 1 st basic unit comprises an inductor L₁₁A diode D₁₁Two capacitors C₁₁、C₁₂(ii) a It is composed ofMiddle and high capacitance C₁₁Respectively connected with the inductor L₁₁One terminal of (1), diode D₁₁Is connected to the anode of a diode D₁₁Cathode and capacitor C₁₂Is connected to one end of an inductor L₁₁Another terminal of (1) and a capacitor C₁₂The other ends of the two are connected;

the 2 nd basic unit comprises an inductor L₂₁A diode D₂₁Two capacitors C₂₁、C₂₂(ii) a Wherein, the capacitor C₂₁Respectively connected with the inductor L₂₁One terminal of (1), diode D₂₁Is connected to the anode of a diode D₂₁Cathode and capacitor C₂₂Is connected to one end of an inductor L₂₁Another terminal of (1) and a capacitor C₂₂The other ends of the two are connected;

.... analogized, taking the i-th basic unit as an example, it contains an inductor L_i1A diode D_i1Two capacitors C_i1、C_i2(ii) a Wherein, the capacitor C_i1Respectively connected with the inductor L_i1One terminal of (1), diode D_i1Is connected to the anode of a diode D_i1Cathode and capacitor C_i2Is connected to one end of an inductor L_i1Another terminal of (1) and a capacitor C_i2The other ends of the two are connected;

the connection form between the respective base units is as follows; 1< i is less than or equal to n,

capacitor C in the 1 st basic cell₁₁And the 2 nd basic unit middle capacitor C₂₁Are connected to one end of a diode D in the 1 st basic cell₁₁Cathode and capacitor C₁₂And the inductance L in the 2 nd basic unit₂₁Another terminal of (1) and a capacitor C₂₂The other ends of the two connecting points are connected;

capacitance C in 2 nd basic unit₂₁And a capacitor C in the 3 rd basic unit₃₁Are connected to one end of a diode D in the 2 nd basic unit₂₁Cathode and capacitor C₂₂And the 3 rd basic unit inductor L₃₁Another terminal of (1) and a capacitor C₃₂The other ends of the two connecting points are connected;

.... analogized, capacitance C in the i-1 st base unit_(i-1)1And the capacitor C in the ith basic unit_i1Are connected to one end of a diode D in the i-1 th basic unit_(i-1)1Cathode and capacitor C_(i-1)2And the inductance L in the ith basic cell_i1Another terminal of (1) and a capacitor C_i2The other ends of the two connecting points are connected;

the connection relationship between the 1 st basic unit and the basic Boost DC-DC converter is as follows:

l in basic Boost DC-DC converter₁Another terminal of (1) and a diode D₁And the intersection point of the anode connection of the first base unit and the capacitor C in the 1 st base unit₁₁One end of the two ends are connected;

capacitor C in basic Boost DC-DC converter₁And a diode D₁And the inductance L in the 1 st basic cell₁₁Another terminal of (1) and a capacitor C₁₂The other ends of the two connecting points are connected;

diode D in the nth basic unit_n1Cathode and capacitor C_n2Are connected to form a cross point, which is connected with the load R_LAre connected at one end to a load R_LThe other end of the first switch is connected with the negative pole of the input power supply.

2. A Boost DC-DC converter having a plurality of base units according to claim 1, characterized in that: the power switch S₁The gate of (a) is connected to its controller, and its duty cycle can be varied between 0 and 1.

Technical Field

The invention relates to a Boost DC-DC converter, in particular to a Boost DC-DC converter with a plurality of basic units.

Background

Ideally, through adjustment of the duty ratio, the input and output gains of the Boost converter can be changed from zero to infinity, but after considering influences of circuit parasitic parameters, voltage drop of a switching device tube and the like, the Boost capability of the Boost converter is greatly limited. At present, in order to improve the input and output gains of a Boost converter, various direct current Boost converter topologies with high-gain Boost capability are constructed based on the combination of a traditional VM or CW-VM unit and the Boost converter, but the duty ratios of switching tubes are limited and are all larger than 0.5, so that the adjustable range of the input and output gains of the converter is limited, the converter is difficult to be suitable for application occasions with large input and output gain variation ranges, in addition, at least 2 active switches are needed, and the economy is influenced in low-power application occasions. Therefore, research on realizing high-gain boosting based on a basic Boost converter and simultaneously having a wide input and output boosting DC/DC converter is significant.

Disclosure of Invention

The problem that the existing basic Boost DC-DC converter cannot be used in application occasions with high input and output gains or large variation ranges is solved. The invention provides a Boost DC-DC converter with a plurality of basic units, which consists of a basic Boost DC-DC converter and a 'coat circuit'. The coat circuit comprises a plurality of gain units, each basic unit consists of an inductor, two capacitors and a diode, and the input and output gains of the DC-DC converter and the voltage stress of the switching device can be adjusted by adjusting the number of the basic units of the coat circuit. The DC-DC converter only comprises one power switch, and the control strategy and the driving circuit are simple; the method has the advantages of wide input and output voltage regulation range, voltage stress of a switching device and the like, and is suitable for application occasions with high input and output gains or large variation range.

The technical scheme adopted by the invention is as follows:

a Boost DC-DC converter having a plurality of base units, the DC-DC converter comprising:

an input power supply, a load R_LA basic Boost DC-DC converter, n basic units;

the basic Boost DC-DC converter comprisesAn inductor L₁A capacitor C₁A power switch S₁A diode D₁(ii) a The connection form is as follows:

inductor L₁One end of which is connected with the anode of the input power supply, an inductor L₁Are respectively connected with a power switch S₁Drain electrode of (2), diode D₁Anode of (2), capacitor C₁And a diode D₁Is connected to the cathode of the power switch S₁Source electrode and capacitor C₁The other ends of the two-phase current transformer are connected with the negative electrode of the input power supply;

the components and the internal connection forms of the n basic units are the same,

the 1 st basic unit comprises an inductor L₁₁A diode D₁₁Two capacitors C₁₁、C₁₂(ii) a Wherein, the capacitor C₁₁Respectively connected with the inductor L₁₁One terminal of (1), diode D₁₁Is connected to the anode of a diode D₁₁Cathode and capacitor C₁₂Is connected to one end of an inductor L₁₁Another terminal of (1) and a capacitor C₁₂The other ends of the two are connected;

the 2 nd basic unit comprises an inductor L₂₁A diode D₂₁Two capacitors C₂₁、C₂₂(ii) a Wherein, the capacitor C₂₁Respectively connected with the inductor L₂₁One terminal of (1), diode D₂₁Is connected to the anode of a diode D₂₁Cathode and capacitor C₂₂Is connected to one end of an inductor L₂₁Another terminal of (1) and a capacitor C₂₂The other ends of the two are connected;

.... analogized, taking the i-th basic unit as an example, it contains an inductor L_i1A diode D_i1Two capacitors C_i1、C_i2(ii) a Wherein, the capacitor C_i1Respectively connected with the inductor L_i1One terminal of (1), diode D_i1Is connected to the anode of a diode D_i1Cathode and capacitor C_i2Is connected to one end of an inductor L_i1Another terminal of (1) and a capacitor C_i2The other ends of the two are connected;

the connection form between the respective base units is as follows; 1< i is less than or equal to n,

capacitor C in the 1 st basic cell₁₁And the 2 nd basic unit middle capacitor C₂₁Are connected to one end of a diode D in the 1 st basic cell₁₁Cathode and capacitor C₁₂And the inductance L in the 2 nd basic unit₂₁Another terminal of (1) and a capacitor C₂₂The other ends of the two connecting points are connected;

capacitance C in 2 nd basic unit₂₁And a capacitor C in the 3 rd basic unit₃₁Are connected to one end of a diode D in the 2 nd basic unit₂₁Cathode and capacitor C₂₂And the 3 rd basic unit inductor L₃₁Another terminal of (1) and a capacitor C₃₂The other ends of the two connecting points are connected;

.... analogized, capacitance C in the i-1 st base unit_(i-1)1And the capacitor C in the ith basic unit_i1Are connected to one end of a diode D in the i-1 th basic unit_(i-1)1Cathode and capacitor C_(i-1)2And the inductance L in the ith basic cell_i1Another terminal of (1) and a capacitor C_i2The other ends of the two connecting points are connected;

the connection relationship between the 1 st basic unit and the basic Boost DC-DC converter is as follows:

l in basic Boost DC-DC converter₁Another terminal of (1) and a diode D₁And the intersection point of the anode connection of the first base unit and the capacitor C in the 1 st base unit₁₁One end of the two ends are connected;

capacitor C in basic Boost DC-DC converter₁And a diode D₁And the inductance L in the 1 st basic cell₁₁Another terminal of (1) and a capacitor C₁₂The other ends of the two connecting points are connected;

diode D in the nth basic unit_n1Cathode and capacitor C_n2Are connected to form a cross point, which is connected with the load R_LAre connected at one end to a load R_LThe other end of the first switch is connected with the negative pole of the input power supply.

The power switch S₁The gate of (a) is connected to its controller, and its duty cycle can be varied between 0 and 1.

The invention discloses a Boost DC-DC converter with a plurality of basic units, which has the following technical effects:

1. the input and output gain is improved, and the voltage stress of the switching device is low, specifically as follows:

inductor L₁When the current is continuously on:

the input and output gains are:

the voltage stress of the switching tube is as follows:wherein D is the duty cycle, u_inIs an input voltage u_oTo output a voltage u_sFor power switch voltage stress, n is the base unit number.

2. The converter only comprises 1 power switch, and the control strategy and the driving circuit are simple.

3. The input and output gains of the DC-DC converter and the voltage stress of the switching device can be adjusted by adjusting the number of basic units of the coat circuit. The DC-DC converter has the advantages of wide input and output voltage regulation range, voltage stress of a switching device and the like, and is suitable for application occasions with high input and output gains or large variation range.

Drawings

Fig. 1 is a schematic diagram of the circuit of the present invention.

Fig. 2 is a circuit topology diagram of the present invention with a base cell number of 2.

Fig. 3 is a schematic diagram of a conventional Boost DC-DC converter circuit.

Fig. 4 is a graph comparing the input and output gains of the present invention when the number of basic units is 2 with those of the conventional Boost DC-DC converter.

Fig. 5 is a simulated waveform diagram of the terminal voltage and duty ratio of the switch when the number of basic units is 2.

FIG. 6 is a waveform diagram of the input voltage and output voltage simulation for the basic cell number of 2 according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 2 shows a circuit topology diagram of the present invention with 2 basic units:

a Boost DC-DC converter with multiple basic units comprises a DC input source, a load R_LA basic Boost DC-DC converter, n basic units. Wherein:

the basic Boost DC-DC converter comprises an inductor L₁A capacitor C₁A power switch S₁A diode D₁Its connection form is as follows, inductor L₁One end of the first switch is connected with the anode of the input power supply, and the other end of the first switch is connected with the power switch S₁And diode D₁Anode of (2), capacitor C₁And a diode D₁Is connected to the cathode of the power switch S₁Source electrode and capacitor C₁And the other end of the second switch is connected with the negative electrode of the input power supply.

The 1 st basic unit comprises an inductor L₁₁A diode D₁₁Two capacitors C₁₁、C₁₂. Wherein the capacitor C₁₁Another end of (a) and an inductor L₁₁And a diode D₁₁Is connected to the anode of a diode D₁₁Cathode and capacitor C₁₂Is connected to one end of an inductor L₁₁Another terminal of (1) and a capacitor C₁₂And the other end of the two are connected. .

The connection relationship between 2 base units is as follows:

capacitor C in the 1 st basic cell₁₁And the 2 nd basic unit middle capacitor C₂₁Are connected to one end of a diode D in the 2 nd basic unit₁₁Cathode and capacitor C₁₂And the inductance L in the 2 nd basic unit₂₁Another terminal of (1) and a capacitor C₂₂The other ends of the two are connected with each other at the intersection point.

1 st radicalThe connection relationship between the basic unit and the basic Boost DC-DC converter is as follows, L in the basic Boost DC-DC converter₁Another terminal of (1) and a diode D₁And the capacitor C in the 1 st basic unit₁₁Is connected to one terminal of a capacitor C in the basic Boost DC-DC converter₁And a diode D₁And the inductance L in the 1 st basic cell₁₁Another terminal of (1) and a capacitor C₁₂The other ends of the two are connected with each other at the intersection point.

Load R_LAnd the 2 nd basic cell middle diode D₂₁Cathode and capacitor C₂₂Are connected at an intersection point where one end of the load R is connected_LThe other end of the first switch is connected with the negative pole of the input power supply.

The power switch S₁The gate of (a) is connected to its controller, and its duty cycle can be varied between 0 and 1.

At inductor L₁When the current is continuously conducted, the circuit can be divided into 2 working states according to different power switch states:

(1): power switch S₁Conducting, diode D₁、D₁₁、D₂₁Are all turned off, and the inductor L at the moment₁、L₁₁、L₂₁Capacitor C₁₁、C₂₁Charging, capacitance C₁、C₁₂、C₂₂Discharge inductor L₁、L₁₁、L₂₁The terminal voltage is shown as follows:

(2): power switch S₁Turn-off, diode D₁、D₁₁、D₂₁Are all turned on, and the inductor L is at the moment₁、L₁₁、L₂₁Capacitor C₁₁、C₂₁Discharge, capacitance C₁、C₁₂、C₂₂Charging inductor L₁、L₂、L₁₁The terminal voltage is shown as follows:

output voltage u_oIs a capacitor C₂、C₁₂、C₂₂Terminal voltage u of_c1、u_c12、u_c22And (c) the sum, i.e.:

u_o＝u_c1+u_c12+u_c22

simulation parameters: input voltage u_in＝48V，L₁＝300μH，C₁20 muF, 73.53% duty cycle D, and load resistance R_L400 Ω. number of basic units n 2, inductance L in the basic units₁₁、L₂₁950 μ H, capacitance C₁₁、C₂₁20 μ F. The simulated waveforms of the terminal voltage and the duty ratio at both ends of the switch are shown in FIG. 5, u_S1The simulated waveforms of the input voltage and the output voltage are shown in fig. 6, u is 181.3V_o＝448.0V。