CN209170220U - A kind of single switch high-gain Boost based on novel voltage gain unit - Google Patents

Abstract

The single switch high-gain Boost based on novel voltage gain unit that the utility model proposes a kind of.Mentioned converter is made of basic Boost and several mentioned novel voltage gain units.Mentioned voltage gain unit is made of an inductance, two capacitors and a diode, and the adjusting to converter input and output gain and switching device voltage stress can be realized in the number by adjusting mentioned voltage gain unit.Furthermore mentioned converter also has the advantages such as control and simple, the switching device voltage stress of driving circuit, is more suited to the biggish application of input and output voltage difference.

Description

A kind of single switch high-gain Boost based on novel voltage gain unit

Technical field

It is specifically a kind of to be based on novel voltage the utility model relates to a kind of single switch high gain boost DC-DC converter The single switch high-gain Boost of gain unit.

Background technique

Because of the demand of the applications such as photovoltaic, fuel cell power generation, non-isolation type high-gain DC-DC converter obtains in recent years Fast development is arrived.The thinking that traditional Boost input and output gain is wherein improved using voltage gain unit is also obtained Extensive research has been arrived, the circuit structure limitation of existing voltage gain unit is limited to, this kind of scheme often needs two basic Boost Converter is connected in the form of crisscross parallel, is had the advantage that (1) input and output high gain and is adjusted；(2) switching device Voltage stress is low.There is also some common limitations for this quasi-converter: (1) needing two switching tubes, and control signal and need It cooperates；(2) switching tube duty ratio need to be greater than 0.5, so that converter input and output gain section is limited.Thus as can building The voltage gain unit that can be adapted for single phase boost converter out has weight for constructing novel high-gain DC-DC converter Want meaning.

Summary of the invention

To solve, the number of switches of existing voltage gain unit in the presence of being applied to Boost is more, duty ratio The problems such as limited, the utility model are based on constructed novel voltage gain unit, propose a kind of based on novel voltage gain unit Single switch high-gain Boost.

The technical solution that the utility model is taken are as follows:

A kind of single switch high-gain Boost based on novel voltage gain unit, the converter include one straight Flow input source, a load R_L, a basic Boost, n voltage gain unit；Wherein:

Basic Boost includes an inductance L₁, a capacitor C₁, a power switch S₁, a diode D₁。 Its type of attachment is as follows: inductance L₁Left end meet the anode of input power, inductance L₁Right end connect power switch S₁Drain electrode with And diode D₁Anode, diode D₁Cathode and capacitor C₁Upper end be connected, power switch S₁Source electrode, capacitor C₁Lower end It is connected with the cathode of input power；

The component of n voltage gain unit and internal type of attachment are all the same, illustrate by taking i-th of expanding element as an example, It contains: an inductance L_i1, a diode D_i1, two capacitor C_i1、C_i2, wherein capacitor C_i1Right end and inductance L_i1Upper end And diode D_i1Anode be connected, diode D_i1Cathode and capacitor C_i2Upper end be connected.

Type of attachment between each voltage gain unit is as follows, 1 < i≤n:

Capacitor C in (i-1)-th voltage gain unit_(i-1)1Right end, inductance L_(i-1)1Upper end and diode D_(i-1)1's Capacitor C in anode connected intersection point and i-th of voltage gain unit_i1Left end be connected, two poles in (i-1)-th voltage gain unit Pipe D_(i-1)1Cathode and capacitor C_(i-1)2The connected intersection point and i-th of voltage gain unit in upper end in inductance L_i1Lower end phase Even, capacitor C in (i-1)-th voltage gain unit_(i-1)2Lower end and capacitor C in i-th voltage gain unit_i2Lower end and The cathode of input power is connected；

1st connection relationship between voltage gain unit and basic Boost is as follows: basic Boost Middle inductance L₁Right end and power switch S₁Drain electrode and diode D₁The connected intersection point and the 1st expanding element of anode in Capacitor C₁₁Left end be connected, diode D in basic Boost₁Cathode and capacitor C₁The connected intersection point and the 1st in upper end Inductance L in a expanding element₁₁Lower end be connected.

Load R_LBoth ends and capacitor C in n-th expanding element_n2Both ends be connected.

The power switch S₁Grid connect its controller, duty ratio can change between 0 to 1.

A kind of single switch high-gain Boost based on novel voltage gain unit of the utility model, technical effect It is as follows:

1, input and output high gain and adjustable, switching device voltage stress is low and adjustable.Wherein (inductance L₁Electric current it is continuous When conducting):

The ratio of output voltage and input voltage are as follows:

Switch tube voltage stress are as follows:

Wherein D is duty ratio, u_inFor input voltage, u_oFor output voltage, u_sFor power switching voltage stress, n is voltage Gain unit quantity.

2, only contain 1 power switch, control strategy and driving circuit are simple.

Detailed description of the invention

Fig. 1 is the utility model circuit diagram.

Fig. 2 be the utility model expanding element number be 1 when circuit topology figure.

Fig. 3 is the circuit topology figure of traditional Boost.

Fig. 4 be the utility model expanding element number be 1 when input and output gain with tradition Boost input it is defeated Gain contrast figure out.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawing.

It is as shown in Figure 2: a kind of single switch high-gain Boost based on novel voltage gain unit, the converter Include a direct current input source, a load R_L, a basic Boost, n voltage gain unit；Wherein:

Basic Boost includes an inductance L₁, a capacitor C₁, a power switch S₁, a diode D₁。 Its type of attachment is as follows: inductance L₁Left end meet the anode of input power, inductance L₁Right end connect power switch S₁Drain electrode with And diode D₁Anode, diode D₁Cathode and capacitor C₁Upper end be connected, power switch S₁Source electrode, capacitor C₁Lower end It is connected with the cathode of input power；

The component of n voltage gain unit and internal type of attachment are all the same, illustrate by taking i-th of expanding element as an example, It contains: an inductance L_i1, a diode D_i1, two capacitor C_i1、C_i2, wherein capacitor C_i1Right end and inductance L_i1Upper end And diode D_i1Anode be connected, diode D_i1Cathode and capacitor C_i2Upper end be connected.

Type of attachment between each voltage gain unit is as follows, 1 < i≤n:

Capacitor C in (i-1)-th voltage gain unit_(i-1)1Right end, inductance L_(i-1)1Upper end and diode D_(i-1)1's Capacitor C in anode connected intersection point and i-th of voltage gain unit_i1Left end be connected, two poles in (i-1)-th voltage gain unit Pipe D_(i-1)1Cathode and capacitor C_(i-1)2The connected intersection point and i-th of voltage gain unit in upper end in inductance L_i1Lower end phase Even, capacitor C in (i-1)-th voltage gain unit_(i-1)2Lower end and capacitor C in i-th voltage gain unit_i2Lower end and The cathode of input power is connected；

1st connection relationship between voltage gain unit and basic Boost is as follows: basic Boost Middle inductance L₁Right end and power switch S₁Drain electrode and diode D₁The connected intersection point and the 1st expanding element of anode in Capacitor C₁₁Left end be connected, diode D in basic Boost₁Cathode and capacitor C₁The connected intersection point and the 1st in upper end Inductance L in a expanding element₁₁Lower end be connected.

Load R_LBoth ends and capacitor C in n-th expanding element_n2Both ends be connected.

The power switch S₁Grid connect its controller, duty ratio can change between 0 to 1.

In inductance L₁Electric current when being continuously turned on, according to the difference of power switch state, circuit can be divided into 2 kinds of work State:

(1): power switch S₁Conducting, diode D₁、D₁₁It is turned off, at this time inductance L₁、L₁₁, capacitor C₁₁Charging, capacitor C₁、 C₁₂Electric discharge；Inductance L₁、L₂、L₁₁End voltage is shown below:

(2): power switch S₁Shutdown, diode D₁、D₁₁It is both turned on, at this time inductance L₁、L₁₁, capacitor C₁₁Electric discharge, capacitor C₁、 C₁₂Charging；Inductance L₁、L₂、L₁₁End voltage is shown below:

The above-mentioned embodiment of the utility model be only be illustrate examples for clearly illustrating the present invention, and not be to this The restriction of the embodiment of utility model.For those of ordinary skill in the art, on the basis of the above description also Other various forms of variations and variation can be made.Here all embodiments can not be exhaustive.It is all to belong to this The technical solution of utility model, changes and variations that derived from still in the protection scope of the utility model it Column.

Claims (1)

1. a kind of single switch high-gain Boost based on novel voltage gain unit, it is characterised in that: the converter packet Containing a direct current input source, a load R_L, a basic Boost, n voltage gain unit；Wherein:

Basic Boost includes an inductance L₁, a capacitor C₁, a power switch S₁, a diode D₁；It is connected Form is as follows: inductance L₁Left end meet the anode of input power, inductance L₁Right end connect power switch S₁Drain electrode and two poles Pipe D₁Anode, diode D₁Cathode and capacitor C₁Upper end be connected, power switch S₁Source electrode, capacitor C₁Lower end and input The cathode of power supply is connected；

The component of n voltage gain unit and internal type of attachment are all the same, illustrate by taking i-th of expanding element as an example, contain Have: an inductance L_i1, a diode D_i1, two capacitor C_i1、C_i2, wherein capacitor C_i1Right end and inductance L_i1Upper end and Diode D_i1Anode be connected, diode D_i1Cathode and capacitor C_i2Upper end be connected；

Type of attachment between each voltage gain unit is as follows, 1 < i≤n:

Capacitor C in (i-1)-th voltage gain unit_(i-1)1Right end, inductance L_(i-1)1Upper end and diode D_(i-1)1Anode Capacitor C in connected intersection point and i-th of voltage gain unit_i1Left end be connected, diode in (i-1)-th voltage gain unit D_(i-1)1Cathode and capacitor C_(i-1)2The connected intersection point and i-th of voltage gain unit in upper end in inductance L_i1Lower end be connected, Capacitor C in (i-1)-th voltage gain unit_(i-1)2Lower end and capacitor C in i-th voltage gain unit_i2Lower end and input The cathode of power supply is connected；

1st connection relationship between voltage gain unit and basic Boost is as follows: electricity in basic Boost Feel L₁Right end and power switch S₁Drain electrode and diode D₁The connected intersection point and the 1st expanding element of anode in capacitor C₁₁Left end be connected, diode D in basic Boost₁Cathode and capacitor C₁The connected intersection point in upper end expand with the 1st Open up inductance L in unit₁₁Lower end be connected；

Load R_LBoth ends and capacitor C in n-th expanding element_n2Both ends be connected.