CN205453494U - Continuous accurate Z source converter of mixed type of arrival current - Google Patents

Abstract

The utility model provides a continuous accurate Z source converter of mixed type of arrival current, the converter includes the direct -current input power, first inductance (i) L (i) 1), 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), second inductance (i) L (i) 2), third inductance (i) L (i) 3), third electric capacity (i) C (i) 3), third diode (i) D (i) 3), fourth electric capacity (i) C (i) 4), switch tube (i) S (i)), output capacitance (i) cout (i)) and load. The utility model discloses compare in boost converter, traditional Z source booster converter etc. And have higher voltage gain, be applicable to the occasion of non - isolated form high -gain DC voltage transform.

Description

A kind of mixed type quasi-Z source converter of continuous input current

Technical field

This utility model relates to DC/DC changer field, is specifically related to the mixed type quasi-Z source converter of a kind of continuous input current.

Background technology

The development of the regenerative resource such as photovoltaic, fuel cell has become one of maximally effective means making up fossil fuel shortages and protection environment.High-gain DC/DC changer can increase substantially DC voltage level, is widely used in grid-connected power generation system.In other industrial applications, such as high-voltage gas discharging light, X-ray machine DC source etc., high-gain DC/DC changer also has important using value.But many boosting DC/DC changers are limited by dutycycle, heat and loss, it is impossible to realizing significantly boosting, such as Boost, its voltage gain is 1/ (1-D), and D is dutycycle, but due to the impact of parasitic parameter, its gain is restricted；And for example Z source booster converter, its voltage gain is that (1-D)/(1-2D), relatively Boost improves, but still has the space of lifting.

Utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, proposes the mixed type quasi-Z source converter of a kind of continuous input current.

This utility model circuit specifically includes direct-current input power supplying V_in, first inductance this utility model, first diode this utility model, first electric capacity this utility model, second electric capacity this utility model, second diode this utility model, second inductance this utility model, the 3rd inductance this utility model, the 3rd electric capacity this utility model, the 3rd diode this utility model, the 4th electric capacity this utility model, switching tube this utility model, output capacitance this utility model and load.

The concrete connected mode of this utility model circuit is: described direct-current input power supplying V_inPositive pole and the first inductance one end of the present utility model connect.The first described inductance other end of the present utility model is connected with the first diode anode of the present utility model and the second electric capacity one end of the present utility model.The first described diode negative electrode of the present utility model and the first electric capacity one end of the present utility model, second inductance one end of the present utility model and the 3rd electric capacity one end of the present utility model connect.The second described inductance other end of the present utility model is connected with the second diode anode of the present utility model and the 4th electric capacity one end of the present utility model.The second described diode negative electrode of the present utility model and the 3rd electric capacity other end of the present utility model and the 3rd inductance one end of the present utility model connect.The 3rd described inductance other end of the present utility model is connected with the 4th electric capacity other end of the present utility model, the second electric capacity other end of the present utility model, the drain electrode of switching tube this utility model and the 3rd diode anode of the present utility model.The 3rd described diode negative electrode of the present utility model one end of the present utility model with output capacitance and one end of load are connected.Described output capacitance this utility model is in parallel with load.Described direct-current input power supplying V_inNegative pole and the first electric capacity other end of the present utility model, switching tube source electrode of the present utility model, output capacitance other end of the present utility model and load other end connect.

Compared with prior art, this utility model circuit have the advantage that for: compared to traditional Boost, (its output voltage is) and Z source booster converter (its output voltage is) etc. DC/DC changer, in the case of identical dutycycle and input voltage, there is higher output voltage, output voltage isUnder the conditions of 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 the mixed type quasi-Z source converter structure chart of a kind of continuous input current.

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 circuit, the gain V of Boost and Z source booster converter proposed_out/V_inOscillogram with the change of dutycycle D.

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.

The Basic Topological of this example 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 first inductance L₁Electric current i_L1, the second inductance L₂Electric current i_L2, the 3rd inductance L₃Electric current i_L3, the first electric capacity C₁Voltage V_C1, the second electric capacity C₂Voltage V_C2, the 3rd electric capacity C₃Voltage V_C3, the 4th electric capacity C₄Voltage V_C4Oscillogram 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 first diode D₁, the second diode D₂With the 3rd diode D₃Bear backward voltage cut-off.Direct-current input power supplying V_inWith the second electric capacity C₂Given the first inductance L by switching tube S simultaneously₁Charging, the first electric capacity C₁With the 4th electric capacity C₄Given the second inductance L by switching tube S simultaneously₂Charging, the first electric capacity C₁With the 3rd electric capacity C₃Given the 3rd inductance L by 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 first diode D₁, the second diode D₂With the 3rd diode D₃Bear forward voltage conducting.Direct-current input power supplying V_inWith the first inductance L₁By the first diode D₁Give the first electric capacity C simultaneously₁Charging, the second inductance L₂With the 3rd inductance L₃By the first diode D₁With the second diode D₂Give the second electric capacity C simultaneously₂, the 3rd electric capacity C₃With the 4th electric capacity C₄Charging.Additionally, direct-current input power supplying V_in, the first inductance L₁, the second inductance L₂With the 3rd inductance L₃By the first diode D₁, the second diode D₂With the 3rd diode D₃Give output capacitance C simultaneously_outAnd load supplying.

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

Due to the second inductance L₂With the 3rd inductance L₃Inductance value identical, the 3rd electric capacity C₃With the 4th electric capacity C₄Capacitance identical, then the second inductance L₂With the 3rd inductance L₃Voltage, electric current equal, the 3rd electric capacity C₃With the 4th electric capacity C₄Voltage, electric current equal.

By the first inductance L₁With the second inductance L₂, the 3rd inductance L₃Voltage meansigma methods in a switch periods be zero, available following relationship.

(V_in+V_C2)t_on+(V_in-V_C1)t_off=0 (1)

$(V_{C1}+\frac{V_{C2}}{2})t_{on}-\frac{V_{C2}}{2}{t}_{off}=0---\left(2\right)$

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

V_out=V_C1+V_C2(3)

Simultaneous solution formula (1), (2), (3) available output voltage V_outWith DC input voitage V_inRelation.

$V_{out}=\frac{1}{1-3D}{V}_{in}---\left(4\right)$

Traditional B oost changer is respectively 1/ (1-D) and (1-D)/(1-2D) (D is dutycycle) with the steady-state gain of Z source booster converter, the carried circuit of this utility model and Boost, Z source booster converter 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 0.3 just can to rise to about 100V, and other two changer then needs bigger dutycycle.

Claims (1)

1. the mixed type of a continuous input current quasi-Z source converter, it is characterised in that include direct-current input power supplying, the first inductance (L ₁), the first diode (D ₁), the first electric capacity (C ₁), the second electric capacity (C ₂), the second diode (D ₂), the second inductance (L ₂), the 3rd inductance (L ₃), the 3rd electric capacity (C ₃), the 3rd diode (D ₃), the 4th electric capacity (C ₄), switching tube (S), output capacitance (C _out ) and load；

The positive pole of described direct-current input power supplying and the first inductance (L ₁) one end connect；Described first inductance (L ₁) other end and the first diode (D ₁) anode and the second electric capacity (C ₂) one end connect；Described first diode (D ₁) negative electrode and the first electric capacity (C ₁) one end, the second inductance (L ₂) one end and the 3rd electric capacity (C ₃) one end connect；Described second inductance (L ₂) other end and the second diode (D ₂) anode and the 4th electric capacity (C ₄) one end connect；Described second diode (D ₂) negative electrode and the 3rd electric capacity (C ₃) other end and the 3rd inductance (L ₃) one end connect；Described 3rd inductance (L ₃) other end and the 4th electric capacity (C ₄) other end, the second electric capacity (C ₂) other end, switching tube (S) drain electrode and the 3rd diode (D ₃) anode connect；Described 3rd diode (D ₃) negative electrode and output capacitance (C _out ) one end and load one end connect；Described output capacitance (C _out ) in parallel with load；Described direct-current input power supplyingV _in Negative pole 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.