CN203590037U - Single switch inverted output secondary wide gain converter - Google Patents

Abstract

The utility model provides a single switch inverted output secondary wide gain converter. The converter comprises a Boost circuit, a Buck-Boost circuit and a Buck circuit which are connected in sequence, wherein the Boost circuit consists of an input power supply, a first inductor, a first diode, a second diode, a switching tube and a first capacitor, the Buck-Boost circuit consists of the first capacitor, a second inductor, a second capacitor, a third diode and the switching tube, and the Buck circuit consists of the second capacitor, the switching tube, a fourth diode, a fifth diode, a third inductor, a third capacitor and a load. The single switch inverted output secondary wide gain converter only uses one switching tube, the Boost circuit and the Buck-Boost circuit share the first capacitor, and the Buck-Boost circuit and the Buck circuit share the second capacitor. The single switch inverted output secondary wide gain converter is simple in structure and convenient to control, and the output voltage gain is wide. The single switch inverted output secondary wide gain converter has opposite input voltage polarity and output voltage polarity.

Description

A kind of single switch is oppositely exported secondary molded breadth gain changer

Technical field

The utility model relates to converters technical field, is specifically related to a kind of single-phase high-gain booster converter.

Background technology

The needed voltage of current integrated circuit is usually less than 5V, and following microprocessor required voltage can be down to from current conventional 3.5V lower, even can be lower than 1V.And supply power voltage is 12V or higher conventionally, the buck converter that therefore needs one-level to have wider gain is realized voltage transitions.

In standard telecommunication apparatus, the 48V direct voltage that conventionally battery will be provided rises to 380V busbar voltage, the high-voltage gas discharging light that some auto bulbs are used conventionally need to rise to voltage 100V or higher when starting, in new energy field solar power generation or wind power generation occasion, the voltage that individual module provides is conventionally lower, much smaller than required voltage grade when grid-connected.Therefore, in these occasions, need to use and have the booster converter of higher gain.

Basic DC-DC converter is above-mentioned boosting or step-down occasion as Buck converter, Buck-Boost converter, Boost converter, Cuk converter, Sepic converter and Zeta converter have been difficult to meet.

The occasion that can provide the converter of larger step-down gain can satisfy the demand wider gain buck converter although existing, but cannot be applied to the field of need to boosting, although existing high-gain boost converter can be satisfied the demand, the occasion of high-gain boost converter, can not be applied to step-down field.

Utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of single switch oppositely to export secondary molded breadth gain changer.

The utility model both can be used for needing the occasion of high-gain boost converter as new energy field, was also applicable to need the occasion of wide gain buck converter as microprocessor power supply field.

The utility model is achieved through the following technical solutions:

Single switch is oppositely exported a secondary molded breadth gain changer, comprises the Boost circuit, Buck-Boost circuit and the Buck circuit that connect successively.

Described Boost circuit comprises input power, the first inductance, the first diode, the second diode, switching tube and the first electric capacity;

Described Buck-Boost circuit comprises the first electric capacity, the second inductance, the second electric capacity, the 3rd diode and switching tube;

Described Buck circuit comprises the second electric capacity, switching tube, the 4th diode, the 5th diode, the 3rd inductance, the 3rd electric capacity and load.

One end of described the first inductance is connected with the positive pole of input power;

The other end of described the first inductance respectively with the anode of the first diode, the anodic bonding of the second diode;

The negative electrode of described the first diode is connected with the negative electrode of the 3rd diode with one end of the first electric capacity, one end of the second inductance respectively;

The negative electrode of described the second diode is connected with the drain electrode of switching tube, one end of the other end of the second inductance, the second electric capacity respectively;

The other end of described the second electric capacity is connected with the anode of the 3rd diode, the negative electrode of the 4th diode respectively;

The anode of described the 4th diode is connected with the anode of the 5th diode, one end of the 3rd inductance respectively;

The other end of described the 3rd inductance is connected with the 3rd one end of electric capacity, one end of load respectively;

The negative electrode of the other end of described the first electric capacity, the source electrode of switching tube, the 5th diode, the 3rd other end of electric capacity, the other end of load are all connected with the negative pole of input power.

The input voltage polarity of converter described in the utility model is contrary with output voltage polarity.

The utility model not only Boost circuit, Buck-Boost circuit and Buck circuit shares a switching tube, and Boost circuit and shared the first electric capacity of Buck-Boost circuit, and Buck-Boost circuit and Buck circuit share the second electric capacity.

Compared with prior art, the utlity model has following advantage:

The utility model not only can provide larger step-up ratio, and larger step-down ratio can also be provided, and the occasion that therefore both can be used for boosting also can be used for step-down occasion;

The utility model is only used a switching tube, simple in structure, and it is convenient to control.

Accompanying drawing explanation

Fig. 1 is the circuit diagram that a kind of single switch described in the utility model is oppositely exported the embodiment of secondary molded breadth gain changer;

Fig. 2 a～Fig. 2 b is the groundwork mode figure of circuit diagram shown in Fig. 1 in a switch periods.Wherein Fig. 2 a is the circuit diagram of operation mode 1, and Fig. 2 b is the circuit diagram of 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.

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

As shown in Figure 1,

Single switch is oppositely exported a secondary molded breadth gain changer, comprises Boost circuit A, the Buck-Boost circuit B and the Buck circuit C that connect successively.

Described Boost circuit A comprises input power V _g, the first inductance L ₁, the first diode D ₁, the second diode D ₂, switching tube S and the first capacitor C ₁;

Described Buck-Boost circuit B comprises the first capacitor C ₁, the second inductance L ₂, the second capacitor C ₂, the 3rd diode C ₃with switching tube S;

Described Buck circuit C comprises the second capacitor C ₂, switching tube S, the 4th diode D ₄, the 5th diode D ₅, the 3rd inductance L ₃, the 3rd capacitor C ₃with load R.

Described the first inductance L ₁one end and input power V _gpositive pole connect;

Described the first inductance L ₁the other end respectively with the first diode D ₁anode, the second diode D ₂anodic bonding;

Described the first diode D ₁negative electrode respectively with the first capacitor C ₁one end, the second inductance L ₂one end and the 3rd diode D ₃negative electrode connect;

Described the second diode D ₂negative electrode respectively with drain electrode, the second inductance L of switching tube S ₂the other end, the second capacitor C ₂one end connect;

Described the second capacitor C ₂the other end respectively with the 3rd diode D ₃anode, the 4th diode D ₄negative electrode connect;

Described the 4th diode D ₄anode respectively with the 5th diode D ₅anode, the 3rd inductance L ₃one end connect;

Described the 3rd inductance L ₃the other end respectively with the 3rd capacitor C ₃one end of one end, load R connect;

Described the first capacitor C ₁the other end, the source electrode of switching tube S, the 5th diode D ₅negative electrode, the 3rd capacitor C ₃the other end, load R the other end all with input power V _gnegative pole connect.

The input voltage polarity of converter described in the utility model is contrary with output voltage polarity.

The utility model not only Boost circuit, Buck-Boost circuit and Buck circuit shares a switching tube, and Boost circuit and shared the first electric capacity of Buck-Boost circuit, and Buck-Boost circuit and Buck circuit share the second electric capacity.

As shown in Figure 2 a and 2 b, a kind of single switch is oppositely exported secondary molded breadth gain changer and in a switch periods, is mainly contained 2 operation modes, is described below respectively:

Operation mode 1:

As shown in Figure 2 a, switching tube S is open-minded, the second diode D ₂with the 4th diode D ₄conducting, the first diode D ₁, the 3rd diode D ₃with the 5th diode D ₅cut-off.Input power V _ggive the first inductance L ₁charging, the first capacitor C ₁give the second inductance L ₂charging, the second capacitor C ₂give the 3rd inductance L ₃charging.

Under this operation mode, related electric parameter relationship formula is:

V _L1＝V _g （1）

V _L2＝V _C1 （2）

V _L3＝V _C2-V _O （3）

Wherein, V _grepresent input supply voltage, V _l1represent the first inductance L ₁both end voltage under this operation mode, V _l2represent the second inductance L ₂both end voltage under this operation mode, V _l3represent the 3rd inductance L ₃both end voltage under this operation mode, V _c1, V _c2represent respectively the first capacitor C ₁with the second capacitor C ₂both end voltage, V _orepresent output voltage.

Operation mode 2:

As shown in Figure 2 b, switching tube S disconnects, the first diode D ₁, the 3rd diode D ₃with the 5th diode D ₅conducting, the second diode D ₂with the 4th diode D ₄cut-off.Input power V _gwith the first inductance L ₁give the first capacitor C simultaneously ₁charging, the second inductance L ₂to the second capacitor C ₂transferring energy, the 3rd inductance L ₃by the 5th diode D ₅afterflow.

Under this operation mode, related electric parameter expression is:

$V_{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="131114092222.png"\; state="\{\{state\}\}">L</figure-callout>}1}^{\&prime;}=V_{C1}-V_g---\left(4\right)$

$V_{L2}^{\&prime;}=V_{C2}---\left(5\right)$

$V_{L3}^{\&prime;}=V_o---\left(6\right)$

During converter steady operation, voltage gain is analyzed:

If the switch periods of switching tube work is T _s, duty ratio is D, 1 duration of operation mode is DT _s, 2 duration of operation mode are (1-D) T _s.According to inductance weber equilibrium response, can obtain:

${\mathrm{<figure-callout\; id="1"\; label="V\; L"\; filenames="131114092222.png"\; state="\{\{state\}\}">V</figure-callout>}}_L{\mathrm{DT}}_s={\mathrm{<figure-callout\; id="1"\; label="V\; L"\; filenames="131114092222.png"\; state="\{\{state\}\}">V</figure-callout>}}_L^1(1-D)T_s---\left(7\right)$

$V_{L2}{\mathrm{DT}}_s=V_{L2}^{\&prime;}(1-D)T_s---\left(8\right)$

$V_{L3}{\mathrm{DT}}_s=V_{L3}^{\&prime;}(1-D)T_s---\left(9\right)$

Simultaneous formula (1)～formula (9) can obtain:

$V_o={\left(\frac{D}{1-D}\right)}^2{V}_g$

Can output thus, the voltage gain M of a kind of single-phase high-gain booster converter described in the utility model is:

$M=\frac{V_o}{V_g}={\left(\frac{D}{1-D}\right)}^2$

The utility model not only Boost circuit, Buck-Boost circuit and Buck circuit shares a switching tube, and Boost circuit and shared the first electric capacity of Buck-Boost circuit, and Buck-Boost circuit and Buck circuit share the second electric capacity.

Compared with prior art the utlity model has following advantage:

The utility model not only can provide larger step-up ratio, and larger step-down ratio can also be provided, and the occasion that therefore both can be used for boosting also can be used for step-down occasion;

The utility model is only used a switching tube, simple in structure, and it is convenient to control.

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 (3)

1. single switch is oppositely exported a secondary molded breadth gain changer, it is characterized in that, comprises the Boost circuit (A), Buck-Boost circuit (B) and the Buck circuit (C) that connect successively;

Described Boost circuit (A) comprises input power (V _g), the first inductance (L ₁), the first diode (D ₁), the second diode (D ₂), switching tube (S) and the first electric capacity (C ₁);

Described Buck-Boost circuit (B) comprises the first electric capacity (C ₁), the second inductance (L ₂), the second electric capacity (C ₂), the 3rd diode (C ₃) and switching tube (S);

Described Buck circuit (C) comprises the second electric capacity (C ₂), switching tube (S), the 4th diode (D ₄), the 5th diode (D ₅), the 3rd inductance (L ₃), the 3rd electric capacity (C ₃) and load (R).

2. a kind of single switch according to claim 1 is oppositely exported secondary molded breadth gain changer, it is characterized in that, described the first inductance (L ₁) one end and input power (V _g) positive pole connect;

Described the first inductance (L ₁) the other end respectively with the first diode (D ₁) anode, the second diode (D ₂) anodic bonding;

Described the first diode (D ₁) negative electrode respectively with the first electric capacity (C ₁) one end, the second inductance (L ₂) one end and the 3rd diode (D ₃) negative electrode connect;

Described the second diode (D ₂) negative electrode respectively with drain electrode, the second inductance (L of switching tube (S) ₂) the other end, the second electric capacity (C ₂) one end connect;

Described the second electric capacity (C ₂) the other end respectively with the 3rd diode (D ₃) anode, the 4th diode (D ₄) negative electrode connect;

Described the 4th diode (D ₄) anode respectively with the 5th diode (D ₅) anode, the 3rd inductance (L ₃) one end connect;

Described the 3rd inductance (L ₃) the other end respectively with the 3rd electric capacity (C ₃) one end of one end, load (R) connect;

Described the first electric capacity (C ₁) the other end, the source electrode of switching tube (S), the 5th diode (D ₅) negative electrode, the 3rd electric capacity (C ₃) the other end, load (R) the other end all with input power (V _g) negative pole connect.

3. a kind of single switch according to claim 1 is oppositely exported secondary molded breadth gain changer, it is characterized in that, output voltage polarity is contrary with input voltage polarity.

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