CN203434870U - Two-winding coupling inductor voltage-multiplying single switch tube high-gain converter - Google Patents

Abstract

The utility model discloses a two-winding coupling inductor voltage-multiplying single switch tube high-gain converter comprising a Boost circuit, a coupling inductor voltage-multiplying unit circuit and an output circuit. The Boost circuit is composed of a switch tube, a first diode, a first capacitor, and a primary side winding of a coupling inductor. The coupling inductor voltage-multiplying unit circuit is composed of a first capacitor, a second capacitor, a second diode and a secondary side winding of the coupling inductor. The output circuit is composed of a third diode, a third capacitor and a load. The two-winding coupling inductor voltage-multiplying single switch tube high-gain converter restrains the voltage spike when the switch tube is turned off, reduces the voltage stress borne by the switch tube and recycles the leakage inductance energy, so that voltage gain is high and efficiency is high.

Description

A kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters

Technical field

The utility model relates to converters technical field, is specifically related to a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters.

Background technology

In solar power system or fuel cell system, because the output voltage of monolithic solar cell or single fuel cell is lower and capacity is less, and in practical application, required voltage is conventionally higher, and also higher to efficiency requirement, therefore need the high efficiency booster converter of one-level low voltage and direct current to be converted to the high voltage direct current that is applicable to actual needs.

At present the most frequently used booster converter is single tube Boost converter, yet the scope of boosting of this converter is very limited, conventionally boosts multiple all in ten times, is difficult to meet the conversion requirement of high-gain.For realizing gaining, expand, can use switched capacitor technique, this technology circuit is simple in structure, easily realizes, and impacts greatly the shortcoming that voltage gain is limited but exist switching tube current spike.Although can further expand the voltage gain of converter by multiple-pole switch capacitance structure, it is very complicated that circuit structure can become.

Utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters are provided.

The utility model is applicable to the occasion that photovoltaic system, fuel cell system, energy-recuperation system etc. need to be used high-gain high-performance electric power electronic converter.

The utility model is achieved through the following technical solutions:

A winding coupled inductance voltage-multiplying type list switching tube high-gain converter, comprises Boost circuit, coupling inductance voltage doubling unit circuit and output circuit,

Described Boost electric routing switch pipe S, the first diode D ₁, the first capacitor C ₁, coupling inductance former limit winding L ₁₁form;

Coupling inductance voltage doubling unit circuit is by the first capacitor C ₁, the second capacitor C ₂, the second diode D ₂, coupling inductance secondary winding L ₁₂form;

Output circuit is by the 3rd diode D ₃, the 3rd capacitor C ₃form with load.

The former limit winding L of described coupling inductance ₁₁anodal connection of Same Name of Ends and input power, the former limit winding L of described coupling inductance ₁₁different name end respectively with drain electrode, the first diode D of switching tube S ₁anodic bonding, described the first diode D ₁negative electrode respectively with the first capacitor C ₁one end, the second diode D ₂anodic bonding, described the second diode D ₂negative electrode respectively with the 3rd diode D ₃anode, the secondary winding L of coupling inductance ₁₂different name end connect, the secondary winding L of described coupling inductance ₁₂same Name of Ends and the second capacitor C ₂one end connect, described the 3rd diode D ₃negative electrode respectively with the 3rd capacitor C ₃one end of one end, load connect;

The source electrode of described switching tube S, the first capacitor C ₁the other end, the 3rd capacitor C ₃the other end, the other end of load be connected with the negative pole of input power respectively, described the second capacitor C ₂the other end be connected with the negative pole of input power or be connected with the positive pole of input power or with the 3rd diode D ₃negative electrode connect.

Compared with prior art the utlity model has following advantage:

During the utility model work, utilize the leakage inductance of coupling inductance effectively to suppress the current spike that the second electric capacity causes, the second electric capacity also can reclaim coupling inductance leakage inductance energy simultaneously, improve the efficiency of converter, utilize the turn ratio of the former and deputy limit of coupling inductance winding can regulate the voltage gain of converter, the voltage stress that utilizes the first capacitance limits switching tube to bear;

The utility model circuit structure is simple, and control circuit is easily realized, and is highly suitable for needing the occasion of high-gain, high efficiency converter.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters of the utility model;

Fig. 2 (a)～Fig. 2 (b) is the equivalent circuit diagram of a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters in a switch periods in the utility model embodiment 1, equivalent circuit diagram when wherein Fig. 2 (a) is operation mode 1, equivalent circuit diagram when Fig. 2 (b) is operation mode 2, in figure, solid line represents the part that has electric current to flow through in converter, and dotted line represents the part that does not have electric current to flow through in converter;

Fig. 3 is the circuit diagram of a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters of the utility model embodiment 2;

Fig. 4 is the circuit diagram of a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters of the utility model embodiment 3.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.

Embodiment 1

As shown in Figure 1, a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters, comprise switching tube S, the first diode D ₁, the second diode D ₂, the 3rd diode D ₃, coupling inductance (its limit, Central Plains winding L ₁₁represent secondary winding L ₁₂represent), the first capacitor C ₁, the second capacitor C ₂, the 3rd capacitor C ₃with load R;

By switching tube S, the first diode D ₁, the first capacitor C ₁, the former limit winding L of coupling inductance ₁₁form Boost circuit;

By the first capacitor C ₁, the second capacitor C ₂, the second diode D ₂, the secondary winding L of coupling inductance ₁₂form coupling inductance voltage doubling unit circuit;

By the 3rd diode D ₃, the 3rd capacitor C ₃output circuit with load R formation.

From the above, described Boost circuit and coupling inductance voltage doubling unit circuit share the first capacitor C ₁.

Concrete connected mode is as follows:

The former limit winding L of described coupling inductance ₁₁anodal connection of Same Name of Ends and input power, the former limit winding L of described coupling inductance ₁₁different name end respectively with drain electrode, the first diode D of switching tube S ₁anodic bonding, described the first diode D ₁negative electrode respectively with the first capacitor C ₁one end, the second diode D ₂anodic bonding, described the second diode D ₂negative electrode respectively with the 3rd diode D ₃anode, the secondary winding L of coupling inductance ₁₂different name end connect, the secondary winding L of described coupling inductance ₁₂same Name of Ends and the second capacitor C ₂one end connect, described the 3rd diode D ₃negative electrode respectively with the 3rd capacitor C ₃one end of one end, load R connect;

The source electrode of described switching tube S, the first capacitor C ₁the other end, the second capacitor C ₂the other end, the 3rd capacitor C ₃the other end, the other end of load R be connected with the negative pole of input power Vd respectively.

Winding coupled inductance voltage-multiplying type list switching tube high-gain converter has 2 operation modes in a switch periods, and switching tube S turns on and off two kinds of operation modes that mutually switch, concrete as shown in Fig. 2 (a)～Fig. 2 (b).

Operation mode 1:

As shown in Figure 2 (a) shows, switching tube S is open-minded, now the first diode D ₁with the 3rd diode D ₃turn-off the second diode D ₂conducting, now input power is to the magnetizing inductance charging of coupling inductance, and coupling inductance is delivered to the second capacitor C by energy from input power simultaneously ₂, the first capacitor C ₁also transfer energy to the second capacitor C ₂, the 3rd capacitor C ₃to load, provide energy.

Operation mode 2:

As shown in Fig. 2 (b), switching tube S disconnects, now the first diode D ₁with the 3rd diode D ₃conducting, the second diode D ₂turn-off, the voltage bearing between the switching tube drain-source utmost point is by the first capacitor C ₁clamp.The magnetizing inductance energy of input power and coupling inductance is simultaneously to the first capacitor C ₁shift the first capacitor C ₁charging, meanwhile energy also shifts to load by coupling inductance, gives the 3rd capacitor C simultaneously ₃charging.The second capacitor C ₂to load, provide energy, give the 3rd capacitor C simultaneously ₃charging.

Voltage gain analysis during stable state:

In carrying out circuit steady state voltage analytic process, because leakage inductance is quite little, therefore ignore.

If input voltage is V _d, output voltage i.e. the 3rd capacitor C ₃both end voltage is V _o, the first capacitor C ₁both end voltage is V _c1, the second capacitor C ₂both end voltage is V _c2, coupling inductance secondary umber of turn is N with the ratio of former limit umber of turn, a switch periods is T _s, wherein the switching tube conducting state duration is DT _s, it is (1-D) T that switching tube turn-offs the duration _s;

When switching tube is opened, the magnetizing inductance both end voltage of coupling inductance is V _d, capacitor C ₂both end voltage is:

V _c2=NV _d+V _c1 （1）

When switching tube disconnects, the magnetizing inductance both end voltage of coupling inductance is V _d-V _c1, output voltage is that capacitor C 3 both end voltage are:

V _o=V _c2-N(V _d-V _c1)=(N+1)V _c1 （2）

According to a switch periods internal inductance weber equilibrium principle, can obtain following relational expression:

${\∫}_0^{{\mathrm{DT}}_s}{V}_d\mathrm{dt}+{\∫}_{{\mathrm{DT}}_s}^{T_s}(V_d-V_{c1})\mathrm{dt}=0---\left(3\right)$

Simultaneous formula (1), formula (2) and formula (3), can solve the transducer gain M the utility model proposes and be:

$M=\frac{V_o}{V_d}=\frac{N+1}{1-D}.$

Embodiment 2

As Fig. 3, the unique difference of the present embodiment and embodiment 1 is: described the second capacitor C ₂the other end be connected with the positive pole of input power, all the other structures are all identical with embodiment 1 with function.

Embodiment 3

As Fig. 4, the unique difference of the present embodiment and embodiment 1 is: described the second capacitor C ₂the other end and the 3rd diode D ₃negative electrode connect, all the other structures are all identical with embodiment 1 with function.

Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.

Claims (2)

1. two winding coupled inductance voltage-multiplying type list switching tube high-gain converters, is characterized in that, comprise Boost circuit, coupling inductance voltage doubling unit circuit and output circuit,

Described Boost electric routing switch pipe (S), the first diode (D ₁), the first electric capacity (C ₁), the former limit winding (L of coupling inductance ₁₁) form;

Coupling inductance voltage doubling unit circuit is by the first electric capacity (C ₁), the second electric capacity (C ₂), the second diode (D ₂), the secondary winding (L of coupling inductance ₁₂) form;

Output circuit is by the 3rd diode (D ₃), the 3rd electric capacity (C ₃) and load formation.

2. a kind of two winding coupled inductance voltage-multiplying type list switching tube high-gain converters according to claim 1, is characterized in that the former limit winding (L of described coupling inductance ₁₁) anodal connection of Same Name of Ends and input power, the former limit winding (L of described coupling inductance ₁₁) different name end respectively with drain electrode, the first diode (D of switching tube (S) ₁) anodic bonding, described the first diode (D ₁) negative electrode respectively with the first electric capacity (C ₁) one end, the second diode (D ₂) anodic bonding, described the second diode (D ₂) negative electrode respectively with the 3rd diode (D ₃) anode, the secondary winding (L of coupling inductance ₁₂) different name end connect, the secondary winding (L of described coupling inductance ₁₂) Same Name of Ends and the second electric capacity (C ₂) one end connect, described the 3rd diode (D ₃) negative electrode respectively with the 3rd electric capacity (C ₃) one end of one end, load connect;

The source electrode of described switching tube (S), the first electric capacity (C ₁) the other end, the 3rd electric capacity (C ₃) the other end, the other end of load be connected with the negative pole of input power respectively, described the second electric capacity (C ₂) the other end be connected with the negative pole of input power or be connected with the positive pole of input power or with the 3rd diode (D ₃) negative electrode connect.

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