CN203827211U - Z source half-bridge converter equipped with three energy-storage capacitors and having dual output function - Google Patents

Abstract

The utility model provides a Z source half-bridge converter equipped with three energy-storage capacitors and having dual output function. The Z source half-bridge converter comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first inductor, a second inductor, a first switch tube, a second switch tube, a third switch tube and a diode. The first capacitor, the second capacitor, the first switch tube and the second switch tube constitute a first routine half-bridge converter. The second capacitor, the third capacitor, and the third switch tube constitute a second routine half-bridge converter. The fourth capacitor, the fifth capacitor, the first inductor and the second inductor constitute a Z source impedor. The diode is used for blocking the current of the Z source impedor to flow back to a power supply. According to the utility model, only three switch tubes are adopted, and double channel output is realized. The Z source half-bridge converter provided by the utility model has the advantages of high reliability, wide output voltage scope and abundant output AC pulse waveform, and is especially suitable for an occasion of dual output, such as an electrochemistry power supply apparatus for electrolyzing and electroplating and a green energy occasion such as distributed power generation and the like requiring multiple output channels.

Description

A kind of three storage capacitor dual output Z source half-bridge converters

Technical field

The utility model relates to converters technical field, is specifically related to a kind of three storage capacitor dual output Z source half-bridge converters.

Background technology

Conventional half-bridge converter, inverter bridge leg is directly in parallel with direct voltage source, in the time that the upper and lower switching tube of inverter bridge leg leads directly to because of false triggering, can flow through very large electric current and switching tube is damaged.And the amplitude of this class half-bridge inverter output AC voltage only has the half of input voltage, belongs to voltage-dropping type inverter, the scope of output voltage is narrow.In order to improve the amplitude of output AC voltage, traditional way is to add in inverter prime the link of boosting, or boosts at output termination transformer.In inverter prime adds the scheme of the link of boosting, at least need a multiplex switching tube, the switching loss that this has increased during power transmits, has also increased the complexity of controlling.Although connect transformer and can improve the amplitude of output voltage at inverter output end, in the time that the transformer turn ratio is fixing, the amplitude of output AC voltage is certain value.

At present, have corresponding patent to propose to solve the problems referred to above with Z source half-bridge converter, its circuit as shown in Figure 1.Along with the market demand of new energy technology, the circuit of multicircuit output has become day by day urgent.Therefore,, in the time that needs two-way is exported, just need two Z source half-bridge converters.But two Z source half-bridge converters, need two power supplys, four storage capacitors, four switching tubes, and two Z source impedances.Except this, corresponding control can increase cost and control difficulty, and the stability of system also can reduce.

Utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of dual output Z source half-bridge converter is provided.The utility model only needs a power supply, three switching tubes, three storage capacitors, and a Z source impedance.Than two traditional Z source half-bridge converters, lack a power supply, a storage capacitor, a switching tube and a Z source impedance, but can reach the output gain of traditional Z source half-bridge converter, and there is high reliability, wide output voltage range and abundant output AC impulse waveform, be specially adapted to need the new forms of energy circuit of dual output, and the supply units such as electrochemistry such as metallide.

The utility model is achieved through the following technical solutions:

A kind of three storage capacitor dual output Z source half-bridge converters, comprise the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first inductance, the second inductance, the first switching tube, second switch pipe, the 3rd switching tube and diode.A kind of dual output Z source half-bridge converter forms first conventional half-bridge converter with the first electric capacity, the second electric capacity and the first switching tube, second switch pipe, form second conventional half-bridge converter with the second electric capacity, the 3rd electric capacity and second switch pipe, the 3rd switching tube, with the 4th electric capacity, the 5th electric capacity, the first inductance, the second inductance, form Z source impedance, the electric current backflow telegram in reply source of diode for blocking Z source impedance.

The positive pole of described power supply, one end of the anode of diode and the first electric capacity is connected in a bit, the negative electrode of diode, one end of one end of the first inductance and the 4th electric capacity is connected in a bit, other one end of the first inductance, the drain electrode of one end of the 5th electric capacity and the first switching tube is connected in a bit, the source electrode of the first switching tube, one end of the drain electrode of second switch pipe and the first load is connected in a bit, the source electrode of second switch pipe, one end of the drain electrode of the 3rd switching tube and the second load is connected in a bit, the source electrode of the 3rd switching tube, other one end of one end of the second inductance and the 4th electric capacity is connected in a bit, other one end of the first load, other one end of the first electric capacity and one end of the second electric capacity are connected in a bit, other one end of the second load, other one end of the second electric capacity and one end of the 3rd electric capacity are connected in a bit, other one end of the 3rd electric capacity, other one end of the second inductance, other one end of the 5th electric capacity and the negative pole of power supply are connected in a bit.

Compared with prior art the utlity model has following advantage:

The utility model only needs a power supply, three storage capacitors, three switching tubes, and a Z source impedance.Than traditional two Z source half-bridge converters with two-way output, lack a power supply, a storage capacitor, a switching tube and a Z source impedance, but can reach than the output gain of traditional Z source half-bridge converter, and there is high reliability, wide output voltage range and abundant output AC impulse waveform, be specially adapted to need the new forms of energy circuit of many outputs, and the supply units such as electrochemistry such as metallide.

Converter of the present utility model can prevent the straight-through damage that circuit is caused of switching tube, and switching tube can obtain higher output gain when straight-through, and the output that overcomes traditional half-bridge converter is confined to the shortcoming of input voltage.

Brief description of the drawings

Fig. 1 is the circuit of at present existing a kind of single output Z source half-bridge converter.

Fig. 2 is the circuit diagram of the embodiment of a kind of dual output Z described in the utility model source half-bridge converter;

Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d, Fig. 3 e, Fig. 3 f are respectively the groundwork mode figure of circuit diagram shown in Fig. 2 in a switch periods.

Fig. 4 is the main oscillogram of correspondence of a kind of dual output Z source half-bridge 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.

Case study on implementation

As shown in Figure 2, a kind of dual output Z source half-bridge converter, comprises the first capacitor C _d1, the second capacitor C _d2, the 3rd capacitor C _d3, the 4th capacitor C ₁, the 5th capacitor C ₂, the first inductance L ₁, the second inductance L ₂, the first switching tube S ₁, second switch pipe S ₂, the 3rd switching tube S ₃with diode D.A kind of dual output Z source half-bridge converter is with the first capacitor C _d1, the second capacitor C _d2with the first switching tube S ₁, second switch pipe S ₂form first conventional half-bridge converter, with the second capacitor C _d2, the 3rd capacitor C _d3with second switch pipe S ₂, the 3rd switching tube S ₃form second conventional half-bridge converter, with the 4th capacitor C ₁, the 5th capacitor C ₂, the first inductance L ₁, the second inductance L ₂, forming Z source impedance, diode D is for blocking the electric current backflow telegram in reply source V of Z source impedance _d.

Described a kind of dual output Z source half-bridge converter, described power supply V _dpositive pole, anode and the first capacitor C of diode D _d1one end be connected in a bit, the negative electrode of diode D, the first inductance L ₁one end and the 4th capacitor C ₁one end be connected in a bit, the first inductance L ₁other one end, the 5th capacitor C ₂one end and the first switching tube S ₁drain electrode be connected in a bit, the first switching tube S ₁source electrode, second switch pipe S ₂drain electrode and the first load R ₁one end be connected in a bit, second switch pipe S ₂source electrode, the 3rd switching tube S ₃drain electrode and the second load R ₂one end be connected in a bit, the 3rd switching tube S ₃source electrode, the second inductance L ₂one end and the 4th capacitor C ₁other one end be connected in a bit, the first load R ₁other one end, the first capacitor C _d1other one end and the second capacitor C _d2one end be connected in a bit, the second load R ₂other one end, the second capacitor C _d2other one end and the 3rd capacitor C _d3one end be connected in a bit, the 3rd capacitor C _d3other one end, the second inductance L ₂other one end, the 5th capacitor C ₂other one end and the negative pole of power supply be connected in a bit.

As shown in Fig. 3 a, 3b, 3c, 3d, 3e and 3f, wherein Fig. 3 a is the circuit diagram of operation mode 1, Fig. 3 b is the circuit diagram of operation mode 2, Fig. 3 c is the circuit diagram of operation mode 3, Fig. 3 d is the circuit diagram of operation mode 4, Fig. 3 e is the circuit diagram of operation mode 5, and Fig. 3 f is the circuit diagram of operation mode 6.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.With reference to figure 4, its corresponding operation mode is analyzed as follows.Wherein the first switching tube S ₁, second switch pipe S ₂with the 3rd switching tube S ₃three switching tubes D that lags behind successively ₁open-minded after the T time period, the ON time of each switching tube is D ₂t, T is switching tube switch periods.Taking the positive reference direction as voltage clockwise.

The first capacitor C _d1voltage be V _cd1, electric current is i _cd1, the second capacitor C _d2voltage be V _cd2, electric current is i _cd2, the 3rd capacitor C _d3voltage be V _cd3, electric current is i _cd3, the 4th capacitor C ₁voltage be V _c1, the 5th capacitor C ₂voltage be V _c1, the first inductance L ₁voltage be V _l1, the second inductance L ₂voltage be V _l2, the voltage of the first load is v _o1, electric current is i _o1, the voltage of the second load is v _o2, electric current is i _o2.

Operation mode 1:

As Fig. 4 time period [t ₀-t ₁] shown in, the first switching tube S ₁, second switch pipe S ₂with the 3rd switching tube S ₃three all conductings of switching tube, diode D turn-offs, and equivalent circuit diagram is now as shown in Figure 3 a.Z source impedance is given the first load R ₁with the second load R ₂energy is provided.The first inductance L ₁voltage is: V _l1=V _c1=V _l2=V _c2, the first load R ₁voltage v _o1=V _cd1+ V _c2-V _d, the second load R ₂voltage v _o2=V _c2-V _cd3.This phases-time is (D ₁+ D ₂-1) T.

Operation mode 2:

As Fig. 4 time period [t ₁-t ₂] shown in, second switch pipe S ₂turn-off the first switching tube S ₁with the 3rd switching tube S ₃two all conductings of switching tube, diode D conducting, equivalent circuit diagram is now as shown in Figure 4 b.Power supply V _dprovide energy by diode D to Z source impedance, simultaneously the first inductance L ₁give the first load R ₁provide energy, the first inductance L ₁electric current declines.The 4th capacitor C ₁with the second inductance L ₂give the second load R ₂transmitting energy, the second inductance L ₂electric current declines.The first inductance L ₁voltage is: V _l1=V _d-V _c2, output voltage v _o1=V _cd1+ V _c2-V _d, v _o2=V _d-V _c2-V _cd3.This phases-time is (1-D ₂) T.

Operation mode 3:

As Fig. 4 time period [t ₂-t ₃] shown in, the first switching tube S ₁, second switch pipe S ₂with the 3rd switching tube S ₃three all conductings of switching tube, diode D turn-offs, and equivalent circuit diagram is now as shown in Figure 3 c.The principle in this stage is identical with operation mode 1.This phases-time is (D ₁+ D ₂-1) T.

Operation mode 4:

As Fig. 4 time period [t ₃-t ₄] shown in, the 3rd switching tube S ₃turn-off the first switching tube S ₁with second switch pipe S ₂two all conductings of switching tube, diode D conducting, equivalent circuit diagram is now as shown in Figure 3 d.Power supply V _dprovide energy by diode D to Z source impedance, the first inductance L ₁give the first load R ₁provide energy, the first inductance L ₁electric current declines.The first inductance L simultaneously ₁also give the second load R ₂energy is provided.The first inductance L ₁voltage is: V _l1=V _d-V _c2, output voltage v _o1=V _cd1+ V _c2-V _d, v _o2=V _c2-V _cd3.This phases-time is (1-D ₂) T.

Operation mode 5:

As Fig. 4 time period [t ₄-t ₅] shown in the first switching tube S ₁, second switch pipe S ₂with the 3rd switching tube S ₃three all conductings of switching tube, diode D turn-offs, and equivalent circuit diagram is now as shown in Figure 3 e.The principle in this stage is identical with operation mode 1.This phases-time is (D ₁+ D ₂-1) T.

Operation mode 6:

As Fig. 4 time period [t ₅-t ₆] shown in, the first switching tube S ₁turn-off second switch pipe S ₂with the 3rd switching tube S ₃two all conductings of switching tube, diode D conducting, equivalent circuit diagram is now as shown in Fig. 3 f.Power supply V _dprovide energy by diode D to Z source impedance, simultaneously by the first capacitor C _d1with the 3rd capacitor C _d3give the first load R ₁with the second load R ₂energy is provided, in this process, the first inductance L ₁with the second inductance L ₂electric current declines.The first inductance L ₁voltage is: V _l1=V _d-V _c2, output voltage v _o1=V _cd1-V _c2, v _o2=V _d-V _c2-V _cd3.This phases-time is (1-D ₂) T.

To sum up describe, in a switch periods, according to the first inductance L ₁volt-second count conservation, ${\∫}_0^T{V}_{L1}\mathrm{dt}=0,$ ? $3({\∫}_0^{(D_2+D_1-1)T}{V}_{C2}\mathrm{dt}+{\∫}_{(D_2+D_1-1)T}^{D_{1}T}(V_d-V_{C2})\mathrm{dt})=0,$ Can obtain thus $V_{C1}=V_{C2}=\frac{1-D_2}{2-(D_1+{2D}_2)}{V}_d.$

To sum up, can obtain inductance expression formula and output voltage expression formula is:

In like manner, according to capacitor C _d1, C _d2, C _d3amp-number of seconds conservation,

$\left\{\begin{array}{c}{\∫}_0^T{i}_{\mathrm{cd}1}\mathrm{dt}={\∫}_0^T(i_{\mathrm{cd}2}-i_{o1})\mathrm{dt}={\∫}_0^T{i}_{o1}\mathrm{dt}=0\\ {\∫}_0^T{i}_{\mathrm{cd}2}\mathrm{dt}=0\\ {\∫}_0^T{i}_{\mathrm{cd}3}\mathrm{dt}={\∫}_0^T(i_{\mathrm{cd}2}+i_{o2})\mathrm{dt}={\∫}_0^T{i}_{o2}\mathrm{dt}=0\end{array}\right\},$ To sum up formula can obtain

$\left\{\begin{array}{c}\frac{V_{\mathrm{Cd}1}+V_{C2}-V_d}{R_1}{D}_{2}T+\frac{V_{\mathrm{Cd}1}-V_{C2}}{R_1}\left({1-D}_2\right)T=0\\ \frac{V_{C2}-V_{\mathrm{Cd}3}}{R_2}({2D}_2-1)T+\frac{V_d-V_{C2}-V_{\mathrm{Cd}3}}{R_2}\left({2-2D}_2\right)T=0\end{array}\right\},$ To sum up solve an equation and obtain

$\left\{\begin{array}{c}{V}_{\mathrm{Cd}1}=(1-2D_2)V_{C2}+V_d{D}_2=\frac{1-D_2-D_1{D}_2}{2-(D_1+{2D}_2)}{V}_d\\ V_{\mathrm{Cd}3}=V_{C2}({4D}_2-3)+V_d\left({2-2D}_2\right)=\frac{\left({1-D}_2\right)\left({1-2D}_1\right)}{2-(D_1+{2D}_2)}{V}_d\end{array}\right\},$ Substitution output expression formula can obtain

The existence of Z source impedance has been avoided being damaged because switching tube is straight-through on the one hand, plays on the other hand the effect of boosting in the time that switching tube is straight-through.By controlling the conducting duty ratio of three switching tubes, can control respectively boosting and step-down of two-way output, and realize the symmetry of positive negative pulse stuffing of two output voltage and asymmetric.

The utility model only needs a power supply, three switching tubes, and a Z source impedance.Than traditional two Z source half-bridge converters with two-way output, lack a power supply, four storage capacitors, a switching tube and a Z source impedance, but can reach the output gain of traditional Z source half-bridge converter, and can realize there is high reliability, wide output voltage range and abundant output AC impulse waveform, be specially adapted to the electrochemical power source device such as new forms of energy supply unit and metallide of dual output.

Converter of the present utility model can prevent the straight-through of switching tube, and switching tube can obtain higher output gain when straight-through, overcomes traditional half-bridge converter output and be confined to the shortcoming of input voltage.

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. three storage capacitor dual output Z source half-bridge converters, is characterized in that, comprise the first electric capacity ( c _d1), the second electric capacity ( c _d2), the 3rd electric capacity ( c _d3), the 4th electric capacity ( c ₁), the 5th electric capacity ( c ₂), the first inductance ( l ₁), the second inductance ( l ₂), the first switching tube ( s ₁), second switch pipe ( s ₂), the 3rd switching tube ( s ₃) and diode ( d); Wherein the first electric capacity ( c _d1), the second electric capacity ( c _d2) and the first switching tube ( s ₁), second switch pipe ( s ₂) form first half-bridge converter, with the second electric capacity ( c _d2), the 3rd electric capacity ( c _d3) and second switch pipe ( s ₂), the 3rd switching tube ( s ₃) second half-bridge converter of formation; The 4th electric capacity ( c ₁), the 5th electric capacity ( c ₂), the first inductance ( l ₁), the second inductance ( l ₂), form Z source impedance, diode ( d) for blocking the electric current backflow telegram in reply source (V of Z source impedance _d).

2. a kind of three storage capacitor dual output Z source half-bridge converters according to claim 1, is characterized in that described power supply (V _d) positive pole and the anode of diode (D) and the first electric capacity ( c _d1) one end connect, the negative electrode of diode (D) and the first inductance (L ₁) one end and the 4th electric capacity (C ₁) one end connect, the first inductance (L ₁) other one end and the 5th electric capacity (C ₂) one end and the first switching tube (S ₁) drain electrode connect, the first switching tube (S ₁) source electrode and second switch pipe (S ₂) drain electrode and the first load (R ₁) one end connect, second switch pipe (S ₂) source electrode and the 3rd switching tube (S ₃) drain electrode and the second load (R ₂) one end connect, the 3rd switching tube (S ₃) source electrode and the second inductance (L ₂) one end and the 4th electric capacity (C ₁) other one end connect, the first load (R ₁) other one end and the first electric capacity (C _d1) other one end and the second electric capacity (C _d2) one end connect, the second load (R ₂) other one end and the second electric capacity (C _d2) other one end and the 3rd electric capacity (C _d3) one end connect, the 3rd electric capacity (C _d3) other one end and the second inductance (L ₂) other one end, the 5th electric capacity (C ₂) other one end and the negative pole of power supply be connected.