CN205336115U - Adopt transformer and voltage lifting technology's accurate Z source converter - Google Patents

Abstract

The utility model provides an adopt transformer and voltage lifting technology's accurate Z source converter. The converter includes that direct -current input power, the turn ratio are 1: (I) n (i) transformer (i) T (i)), first diode (i) D (i) 1), first electric capacity (i) C (i) 1), second electric capacity (i) C (i) 2), second diode (i) D (i) 2), first inductance (i) L (i) 1), second inductance (i) L (i) 2), third electric capacity (i) C (i) 3), third diode (i) D (i) 3), switch tube (i) S (i)), fourth diode (i) D (i) 4), output capacitance (i) cout (i)) and load. The utility model discloses compare in flyback converter, the accurate Z source converter of the voltage type of lifting etc. And have higher voltage gain, be applicable to the occasion of non - isolated form high -gain DC voltage transform.

Description

A kind of quasi-Z source converter adopting transformator and voltage lift technique

Technical field

This utility model relates to DC/DC changer field, is specifically related to a kind of quasi-Z source converter adopting transformator and voltage lift technique。

Background technology

In recent years, due to the minimizing day by day of Fossil fuel, renewable energy system is developed rapidly。Fuel cell receives the concern of many research worker because of its high generating efficiency and power density, low noise and other advantages。But fuel cell is output as the unidirectional current of low-voltage, high-current, therefore generally requires and export stable high voltage direct current through DC/DC changer。But many boosting DC/DC changers is subject to the restriction of dutycycle, parasitic parameter and loss, it is impossible to realize significantly boosting, such as anti exciting converter, its voltage gain is nD/ (1-D), n is transformer turns ratio, and D is dutycycle, but due to the impact of parasitic parameter, its gain is restricted；The and for example quasi-Z source converter of voltage lift type, its voltage gain is 2/ (1-3D), and relatively Z source converter improves, but still has the space of lifting。

Utility model content

The purpose of this utility model is in that to overcome above-mentioned the deficiencies in the prior art, it is proposed to a kind of quasi-Z source converter adopting transformator and voltage lift technique。

This utility model circuit specifically includes direct-current input power supplying V_in, the turn ratio be the transformator of 1:n, the first diode, the first electric capacity, the second electric capacity, the second diode, the first inductance, the second inductance, the 3rd electric capacity, the 3rd diode, switching tube, the 4th diode, output capacitance and load。

The concrete connected mode of this utility model circuit is: described direct-current input power supplying V_inPositive pole be connected with the Same Name of Ends of transformer primary side。The different name end of described transformer primary side is connected with one end of the Same Name of Ends of transformer secondary and the second electric capacity。The different name end of described transformer secondary and the anode of the first diode connect。The negative electrode of the first described diode and one end of the first electric capacity, one end of the first inductance and the anode of the second diode connect。One end of the negative electrode of the second described diode and one end of the 3rd electric capacity and the second inductance connects。The described other end of the 3rd electric capacity is connected with the anode of the other end of the first inductance and the 3rd diode。The negative electrode of the 3rd described diode and the other end of the second inductance, the other end of the second electric capacity, the drain electrode of switching tube and the anode of the 4th diode connect。The negative electrode of the 4th described diode is connected with one end of output capacitance and one end of load。Described output capacitance is in parallel with load。Described direct-current input power supplying V_inNegative pole and the other end of the other end of the first electric capacity, the source electrode of switching tube, the other end of output capacitance and load connect。

Compared with prior art, this utility model circuit have the advantage that for: compared to traditional anti exciting converter, (its output voltage is) and the quasi-Z source converter of voltage lift type (its output voltage is) etc. DC/DC changer, when identical dutycycle and input voltage, there is higher output voltage, output voltage isWhen identical input voltage and output voltage, this utility model circuit has only to less dutycycle just can rise to high-grade voltage by inferior grade voltage, and input and output altogether, continuous input current etc., therefore this utility model circuit has the prospect that is widely applied very much。

Accompanying drawing explanation

Fig. 1 is a kind of quasi-Z source converter structure chart adopting transformator and voltage lift technique。

Fig. 2 is the voltage and current waveform of a switch periods main element。

Fig. 3 a, Fig. 3 b are a switch periods internal circuit modal graph。

Fig. 4 is the gain V of the circuit, anti exciting converter and the quasi-Z source converter of switched inductors type that propose_out/V_inOscillogram with dutycycle D change。

Detailed description of the invention

For this utility model being described in further detail explanation below in conjunction with embodiment and accompanying drawing, but embodiment of the present utility model is not limited to this。If it is noted that the following process having not detailed description especially or parameter, being all that those skilled in the art can refer to prior art understanding or realize。

Basic Topological of the present utility model and each main element voltage x current reference direction are as shown in Figure 1。In order to easy to verify, the device in circuit structure is accordingly to be regarded as ideal component。The driving signal v of switching tube S_GS, the first diode D₁Electric current i_D1, the second diode D₂Electric current i_D2, the 3rd diode D₃Electric current i_D3, the 4th diode D₄Electric current i_D4, the first inductance L₁Electric current i_L1, the second inductance L₂Electric current i_L2, transformator T magnetizing inductance L_mElectric current i_Lm, the first electric capacity C₁Voltage V_C1, the second electric capacity C₂Voltage V_C2, the 3rd electric capacity C₃Voltage V_C3Oscillogram as shown in Figure 2。

At t₀～t₁Stage, changer this stage modal graph as shown in Figure 3 a, the driving signal v of switching tube S_GSBecoming high level from low level, switching tube S turns on, the second diode D₂With the 3rd diode D₃Bear forward voltage conducting, the first diode D₁With the 4th diode D₄Bear backward voltage cut-off。Direct-current input power supplying V_inWith the second electric capacity C₂Given the magnetizing inductance L of transformator T by switching tube S simultaneously_mCharging, the first electric capacity C₁By the second diode D₂Give the second inductance L with switching tube S simultaneously₂Charging, the first electric capacity C₁By the 3rd diode D₃Give the first inductance L with switching tube S simultaneously₁Charging, the first electric capacity C₁By the second diode D₂, the 3rd diode D₃Give the 3rd electric capacity C with switching tube S simultaneously₃Charging。Additionally, output capacitance C_outPowering load。

At t₁～t₂Stage, changer this stage modal graph as shown in Figure 3 b, the driving signal v of switching tube S_GSBecoming low level from high level, switching tube S turns off, the second diode D₂With the 3rd diode D₃Bear backward voltage cut-off, the first diode D₁With the 4th diode D₄Bear forward voltage conducting。Direct-current input power supplying V_inMagnetizing inductance L with transformator T_mBy the first diode D₁Give the first electric capacity C simultaneously₁Charging, direct-current input power supplying V_inMagnetizing inductance L with transformator T_mBy the 4th diode D₄Give the second electric capacity C simultaneously₂, output capacitance C_outCharge with load, the first inductance L₁, the second inductance L₂With the 3rd electric capacity C₃By the first diode D₁Give the second electric capacity C simultaneously₂Charging, the first inductance L₁, the second inductance L₂With the 3rd electric capacity C₃By the 4th diode D₄Give the first electric capacity C simultaneously₁, output capacitance C_outCharge with load。Additionally, direct-current input power supplying V_in, transformator T magnetizing inductance L_m, the first inductance L₁, the second inductance L₂With the 3rd electric capacity C₃By the first diode D₁With the 4th diode D₄Give output capacitance C simultaneously_outCharge with load。

The steady-state gain of this utility model circuit is derived as follows。

Due to the first inductance L₁With the second inductance L₂Inductance value equal, then the first inductance L₁With the second inductance L₂Voltage, electric current equal。

By the first inductance L₁Magnetizing inductance L with transformator T_mVoltage meansigma methods in a switch periods be zero, following relationship can be obtained。

$(V_{in}+V_{C2})t_{on}+\frac{V_{in}-V_{C1}}{n+1}{t}_{off}=0---\left(1\right)$

$V_{C1}{t}_{on}+\[\frac{V_{C3}}{2}-\frac{V_{C2}}{2}-\frac{n(V_{in}-V_{C1})}{2(n+1)}\]t_{off}=0---\left(2\right)$

V_C1=V_C3(3)

Again when switching tube S turns off, output voltage V_outMeet following relationship。

$V_{out}=V_{C1}+V_{C2}+\frac{n(V_{in}-V_{C1})}{n+1}---\left(4\right)$

Simultaneous solution formula (1), (2), (3) and (4) can obtain output voltage V_outWith DC input voitage V_inRelation。

$V_{out}=\frac{2}{1-(2n+3)D}{V}_{in}---\left(5\right)$

(D is dutycycle for the steady-state gain respectively nD/ (1-D) of tradition anti exciting converter and the quasi-Z source converter of voltage lift type and 2/ (1-3D), n is transformer turns ratio), as turn ratio n=1, the carried circuit of this utility model and anti exciting converter, the quasi-Z source converter of voltage lift type steady-state gain comparison diagram as shown in Figure 4, as can be seen from Figure 4, when input voltage is 10V, the circuit that the utility model proposes only needs dutycycle to be 0.18 just can rise to about 200V, and other two changer then needs bigger dutycycle。

Claims (1)

1. the quasi-Z source converter adopting transformator and voltage lift technique, it is characterised in that include direct-current input power supplying, the turn ratio is 1:nTransformator (T), the first diode (D ₁), the first electric capacity (C ₁), the second electric capacity (C ₂), the second diode (D ₂), the first inductance (L ₁), the second inductance (L ₂), the 3rd electric capacity (C ₃), the 3rd diode (D ₃), switching tube (S), the 4th diode (D ₄), output capacitance (C _out ) and load；

The positive pole of described direct-current input power supplying and transformator (T) former limit Same Name of Ends connect；Described transformator (T) former limit different name end and transformator (T) Same Name of Ends of secondary and the second electric capacity (C ₂) one end connect；Described transformator (T) the different name end of secondary and the first diode (D ₁) anode connect；Described first diode (D ₁) negative electrode and the first electric capacity (C ₁) one end, the first inductance (L ₁) one end and the second diode (D ₂) anode connect；Described second diode (D ₂) negative electrode and the 3rd electric capacity (C ₃) one end and the second inductance (L ₂) one end connect；Described 3rd electric capacity (C ₃) other end and the first inductance (L ₁) other end and the 3rd diode (D ₃) anode connect；Described 3rd diode (D ₃) negative electrode and the second inductance (L ₂) other end, the second electric capacity (C ₂) other end, switching tube (S) drain electrode and the 4th diode (D ₄) anode connect；Described 4th diode (D ₄) negative electrode and output capacitance (C _out ) one end and load one end connect；Described output capacitance (C _out ) in parallel with load；The negative pole of described direct-current input power supplying and the first electric capacity (C ₁) other end, switching tube (S) source electrode, output capacitance (C _out ) other end and load other end connect。