CN205622510U - Accurate Z source converter of discontinuous mixed type of arrival current - Google Patents

Abstract

The utility model provides an accurate Z source converter of discontinuous 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 inductance (i) L (i) 2), second diode (i) D (i) 2), third electric capacity (i) C (i) 3), fourth electric capacity (i) C (i) 4), third inductance (i) L (i) 3), third diode (i) D (i) 3), the 5th electric capacity (i) C (i) 5), the 6th electric capacity (i) C (i) 6), fourth inductor (i) L (i) 4), switch tube (i) S (i)), fourth diode (i) D (i) 4), output capacitance (i) C (i) (i) out (i)) and load. The utility model discloses compare in boost converter, Z source direct -current converter etc. And have higher voltage gain, be applicable to the occasion of non - isolated form high -gain DC voltage transform.

Description

The mixed type quasi-Z source converter that a kind of input current is interrupted

Technical field

This utility model relates to DC/DC changer field, is specifically related to the mixing that a kind of input current is interrupted Type quasi-Z source converter.

Background technology

In recent years, along with the exhaustion day by day of the fossil energy such as oil, coal, countries in the world are all being opened energetically Sending out renewable and clean energy resource novel, the most such as the regenerative resource such as photovoltaic, fuel cell is grid-connected The research of generating and correlation technique thereof has obtained extensive attention in the world.Because individual fuel cells Relatively low with the output voltage of photovoltaic cell, it usually needs there is the DC power converter of higher boost function As interface circuit, relatively low cell voltage (18～50V) is transformed into sufficiently high DC voltage (200～400V), then carry out inversion to generate electricity by way of merging two or more grid systems, or supply independent AC load.But many liters Pressure DC/DC changer is limited by dutycycle, heat and loss, it is impossible to realize significantly boosting, Such as Boost, its voltage gain is 1/ (1-D), and D is dutycycle, but due to the shadow of parasitic parameter Ringing, its gain is restricted；And for example Z source DC converter, its voltage gain is 1/ (1-2D), relatively Boost improves, but still has the space of lifting, additionally, there may be startup impact electricity The problem of stream.

Utility model content

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

This utility model circuit specifically includes direct-current input power supplying V_in, the first inductance, the first diode, First electric capacity, the second electric capacity, the second inductance, the second diode, the 3rd electric capacity, the 4th electric capacity, the 3rd Inductance, the 3rd diode, the 5th electric capacity, the 6th electric capacity, the 4th inductance, 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 with One end of first inductance and one end of the first electric capacity connect.The other end and first of the first described inductance The anode of diode and one end of the second electric capacity connect.The negative electrode of the first described diode and the first electric capacity Other end and the second inductance one end connect.The other end of the second described inductance and the second electric capacity Other end, one end of the 4th electric capacity and the second diode anode connect.The second described diode Negative electrode and one end of the 3rd electric capacity, one end of the 3rd inductance and the 5th electric capacity one end connect.Described The other end of the 3rd inductance is connected with the anode of the 3rd diode and one end of the 6th electric capacity.Described The negative electrode of three diodes and one end of the other end of the 5th electric capacity and the 4th inductance connect.Described the 4th The other end of inductance and the other end of the 6th electric capacity, the other end of the 4th electric capacity, the leakage of switching tube The anode of pole and the 4th diode connects.The described negative electrode of the 4th diode and one end of output capacitance and One end of load connects.Described output capacitance is in parallel with load.Described direct-current input power supplying V_in's Negative pole and the other end of the 3rd electric capacity, the source electrode of switching tube, the other end of output capacitance and load Other end connects.

Compared with prior art, this utility model circuit have the advantage that into: compared to traditional Boost (its output voltage is changer) and Z source DC converter (its output voltage is) etc. DC/DC changer, in the case of identical dutycycle and input voltage, tool Having higher output voltage, output voltage isAt identical input voltage and output electricity Under the conditions of pressure, this utility model circuit has only to less dutycycle and just can rise paramount by inferior grade voltage The voltage of grade, and input and output are altogether etc., therefore this utility model circuit has and is widely applied very much Prospect.

Accompanying drawing explanation

Fig. 1 is the mixed type quasi-Z source converter structure chart that a kind of input current is interrupted.

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 DC converter proposed_out/V_inChange with dutycycle D Oscillogram.

Detailed description of the invention

For below in conjunction with embodiment and accompanying drawing this utility model being described in further detail explanation, but this reality It is not limited to this with novel embodiment.If it is noted that the following process having detailed description especially or Parameter, is 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 such as Fig. 1 institute Show.In order to easy to verify, the device in circuit structure is accordingly to be regarded as ideal component.The driving letter of switching tube S Number v_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, Three inductance L₃Electric current i_L3, the 4th inductance L₄Electric current i_L4, the first electric capacity C₁Voltage V_C1, the second electric capacity C₂ Voltage V_C2, the 3rd electric capacity C₃Voltage V_C3, the 4th electric capacity C₄Voltage V_C4, the 5th electric capacity C₅Voltage V_C5、 6th electric capacity C₆Voltage V_C6Oscillogram as shown in Figure 2.

At t₀～t₁Stage, changer this stage modal graph as shown in Figure 3 a, the driving of switching tube S Signal v_GSBecoming high level from low level, switching tube S turns on, the first diode D₁, the second diode D₂, the 3rd diode D₃With the 4th diode D₄Bear backward voltage cut-off.Direct-current input power supplying V_in With the second electric capacity C₂With the 4th electric capacity C₄Given the first inductance L by switching tube S simultaneously₁Charging, direct current is defeated Enter power supply V_inWith the first electric capacity C₁With the 4th electric capacity C₄Given the second inductance L by switching tube S simultaneously₂Fill Electricity, the 3rd electric capacity C₃With the 6th electric capacity C₆Given the 3rd inductance L by switching tube S simultaneously₃Charging, the 3rd Electric capacity C₃With the 5th electric capacity C₅Given the 4th inductance L by switching tube S simultaneously₄Charging.Additionally, output electricity Hold C_outPowering load.

At t₁～t₂Stage, changer this stage modal graph as shown in Figure 3 b, the driving of switching tube S Signal v_GSBecoming low level from high level, switching tube S turns off, the first diode D₁, the second diode D₂, the 3rd diode D₃With the 4th diode D₄Bear forward voltage conducting.Direct-current input power supplying V_in With the first inductance L₁With the second inductance L₂By the first diode D₁With the second diode D₂Give first simultaneously Electric capacity C₁, the second electric capacity C₂With the 3rd electric capacity C₃Charging, the 3rd inductance L₃With the 4th inductance L₄Pass through 3rd diode D₃With the second diode D₂Give the 4th electric capacity C simultaneously₄, the 5th electric capacity C₅With the 6th electricity Hold C₆Charging.Additionally, direct-current input power supplying V_in, the first inductance L₁, the second inductance L₂, the 3rd inductance L₃With the 4th inductance L₄By the first diode D₁, the second diode D₂, the 3rd diode D₃With the 4th Diode D₄Give output capacitance C simultaneously_outAnd load supplying.

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, the 3rd inductance L₃With the 4th inductance L₄Inductance value equal, the first electric capacity C₁With the second electric capacity C₂Capacitance equal, the 5th electric capacity C₅With 6th electric capacity C₆Capacitance equal, then the first inductance L₁With the second inductance L₂Voltage, electric current equal, 3rd inductance L₃With the 4th inductance L₄Voltage, electric current equal, the first electric capacity C₁With the second electric capacity C₂ Voltage, electric current equal, the 5th electric capacity C₅With the 6th electric capacity C₆Voltage, electric current equal.

By the first inductance L₁With the second inductance L₂, the 3rd inductance L₃, the 4th inductance L₄Voltage at one Meansigma methods in switch periods is zero, available following relationship.

$(\frac{V_{in}}{2}+V_{C4}+\frac{V_{C3}}{2})t_{on}+(\frac{V_{in}}{2}-V_{C3})t_{off}=0---\left(1\right)$

$(\frac{V_{C4}}{2}+V_{C3})t_{on}-V_{C4}{t}_{off}=0---\left(2\right)$

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_in's Relation.

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

The steady-state gain of traditional B oost changer and Z source DC converter be respectively 1/ (1-D) and 1/ (1-2D) (D is dutycycle), the carried circuit of this utility model becomes with Boost, Z source direct current The steady-state gain comparison diagram of parallel operation as shown in Figure 4, as can be seen from Figure 4, when input voltage is 10V, this The circuit that utility model proposes only needs dutycycle to be 0.225 just can to rise to about 100V, and other two change Parallel operation then needs bigger dutycycle.

Claims (1)

1. the mixed type quasi-Z source converter that an input current is interrupted, 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 inductance (L ₂), the second diode (D ₂), the 3rd electric capacity (C ₃), the 4th electric capacity (C ₄), the 3rd inductance (L ₃), the 3rd diode (D ₃), the 5th electric capacity (C ₅), the 6th electric capacity (C ₆), the 4th inductance (L ₄), 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 the first inductance (L ₁) one end and the first electric capacity (C 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) other end and the second inductance (L ₂) one end connect；Described second inductance (L ₂) other end and the second electric capacity (C ₂) other end, the 4th electric capacity (C ₄) 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, the 3rd inductance (L ₃) one end and the 5th electric capacity (C ₅) one end connect；Described 3rd inductance (L ₃) other end and the 3rd diode (D ₃) anode and the 6th electric capacity (C ₆) one end connect；Described 3rd diode (D ₃) negative electrode and the 5th electric capacity (C ₅) other end and the 4th inductance (L ₄) one end connect；Described 4th inductance (L ₄) other end and the 6th electric capacity (C ₆) other end, the 4th electric capacity (C ₄) 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；Described direct-current input power supplyingV _in Negative pole and the 3rd electric capacity (C ₃) other end, switching tube (S) source electrode, output capacitance (C _out ) other end and load other end connect.