CN207835353U - A kind of high-gain converter based on coupling inductance and a kind of power-supply system - Google Patents

Abstract

The utility model relates to a high-gain converter based on coupled inductance and a power supply system. The power supply system includes an input power supply and a converter. The converter includes a first inductance and a second inductance. A coupled inductor composed of side windings, the first inductor, the second inductor, the first freewheeling diode, the second freewheeling diode, the third freewheeling diode, the fourth freewheeling diode, the first capacitor, the second capacitor and the third capacitor The circuit structure that constitutes the converter. Compared with the existing converters, the converter provided by this solution has higher gain and can meet the high gain requirement. Moreover, a voltage doubler unit is used in the circuit structure, which improves the boosting capability of the converter and reduces the voltage stress of the switch tube and the rectifier module. In addition, the structure of the converter does not add additional switching tubes, which reduces the complexity of circuit control, reduces circuit losses, and improves circuit efficiency.

Description

A High Gain Converter Based on Coupled Inductor and a Power System

technical field

The utility model relates to a high-gain converter based on coupling inductance and a power supply system.

Background technique

With the depletion of traditional fossil energy and the deteriorating environment of human beings, the development of clean renewable energy is imminent. All countries in the world are committed to the research and development of new energy applications, of which solar energy and wind energy have been obtained a wider range of applications. However, for these systems, how to operate grid-connected and meet the high voltage requirements in the grid is still the most important issue. At present, a large number of boost converters have been developed to meet these applications. Among different converters, the traditional BOOST converter can theoretically increase the voltage gain by increasing the duty cycle. However, in practical applications, due to the limitation of parasitic parameters, very high voltage gain cannot be achieved. If a cascaded topology is adopted, the problem of low efficiency caused by the increase in the number of devices will be highlighted again.

The Chinese patent application document with the application publication number CN105391287A discloses a zero-input current ripple high-gain converter based on a double-coupled inductor and a single switch. The duty ratio D is related to the primary and secondary turns ratio N of the coupled inductor T ₂ , and the gain calculation formula is: G=(1+N)/(1-D) ² , although this scheme can achieve a wide gain, but the scheme In the case of higher gain requirements, the converter cannot meet the high gain requirements.

Utility model content

The purpose of the utility model is to provide a high-gain converter based on coupled inductors to further increase the gain of the converter. The utility model also provides a power supply system.

In order to achieve the above purpose, the utility model includes the following technical solutions.

Converter scheme 1: This scheme provides a high-gain converter based on coupled inductors, including a first inductor and a second inductor, the second inductor is a coupled inductor composed of a primary winding and a secondary winding, and the first One end of an inductor is used to connect the positive pole of the input power supply, the other end of the first inductor is respectively connected to the anode of the first freewheeling diode and the anode of the second freewheeling diode, and the cathode of the first freewheeling diode is connected to the The same-named end of the primary winding and one end of the first capacitor, the other end of the first capacitor is used to connect the negative pole of the input power supply, and the different-named end of the primary winding is respectively connected to one end of the switch tube and the second freewheeling diode The cathode of the second capacitor, one end of the second capacitor and the anode of the fourth freewheeling diode, the other end of the switch tube is used to connect the negative pole of the input power supply, and the other end of the second capacitor is respectively connected to the anode of the third freewheeling diode and The end with the same name of the secondary winding, the opposite end of the secondary winding is respectively connected to the cathode of the fourth freewheeling diode and one end of the third capacitor, and the other end of the third capacitor is respectively connected to the cathode of the third freewheeling diode and A rectification module, the DC end of the rectification module is the output end of the converter.

The high-gain converter provided by this solution involves two inductors. The first inductor is a conventional inductor, and the second inductor is a coupled inductor composed of a primary winding and a secondary winding. These two inductors are combined with other related The circuit structure composed of components is the high-gain converter provided by this solution. Therefore, compared with the existing converters, the converter provided by this solution has higher gain and can meet the high-gain requirements. Moreover, the converter adopts a voltage doubler unit composed of the second capacitor, the third capacitor, the third freewheeling diode and the fourth freewheeling diode, which improves the boosting capability and reduces the voltage stress of the switch tube and the rectifier module . In addition, the structure of the converter does not add additional switching tubes, which reduces the complexity of circuit control, reduces circuit losses, and improves circuit efficiency.

Converter scheme 2: On the basis of converter scheme 1, the converter also includes a clamping capacitor and a clamping diode, the opposite end of the primary winding is connected to the anode of the clamping diode, and the clamping The cathode of the diode is connected to one end of the second capacitor, the anode of the fourth freewheeling diode and one end of the clamping capacitor, and the other end of the clamping capacitor is used to connect to the negative pole of the input power supply.

The clamping diode and the clamping capacitor form a passive non-destructive clamping circuit, which is used to absorb the energy of the leakage inductance, thereby suppressing the peak voltage of the switching tube, and at the same time, alleviating the reverse recovery problem of the diode, and adopting low-rated devices, Therefore, the efficiency is improved. Furthermore, the clamping diode and the clamping capacitor constitute a loop for releasing energy from the leakage inductance of the coupling inductor, which circulates the energy of the leakage inductance to the output terminal, thereby greatly improving the efficiency of the converter.

Converter solution 3: On the basis of converter solution 1 or 2, the rectification module is a rectification diode, the anode of the rectification diode is connected to the other end of the third capacitor, and the cathode of the rectification diode is connected to the output capacitor.

Converter scheme four: on the basis of converter scheme one or two, the switch tube is a MOSFET tube or an IGBT tube.

Converter scheme five: on the basis of converter scheme two, the calculation formula of the gain _MCCM of the converter is:

Among them, D is the duty ratio of the switch tube, and N is the turns ratio of the primary winding and the secondary winding in the coupled inductor.

1+2N-ND=1+N+(1-D)N, since the duty cycle of the switch tube is less than 1, then, 1-D is greater than 0, and then, the value of 1+2N-ND is larger than 1+N, Therefore, it is further illustrated that the gain of the converter provided by this solution is higher than that of the existing converter. Moreover, the larger N is, the more obvious the gain is improved compared to the existing converter.

System Solution 1: This solution provides a power supply system, including an input power supply and a high-gain converter based on a coupled inductor. The converter includes a first inductor and a second inductor. The second inductor is composed of a primary winding and a secondary A coupled inductor composed of side windings, one end of the first inductor is used to connect the positive pole of the input power supply, and the other end of the first inductor is respectively connected to the anode of the first freewheeling diode and the anode of the second freewheeling diode, the The cathode of the first freewheeling diode is connected to the same-named end of the primary winding and one end of the first capacitor, the other end of the first capacitor is used to connect the negative pole of the input power supply, and the different-named ends of the primary winding are respectively connected to One end of the switch tube, the cathode of the second freewheeling diode, one end of the second capacitor and the anode of the fourth freewheeling diode, the other end of the switch tube is used to connect the negative pole of the input power supply, the other end of the second capacitor Respectively connect the anode of the third freewheeling diode and the same-named end of the secondary winding, the opposite-named ends of the secondary winding are respectively connected to the cathode of the fourth freewheeling diode and one end of the third capacitor, and the other end of the third capacitor Respectively connect the cathode of the third freewheeling diode and the rectification module, and the DC terminal of the rectification module is the output terminal of the converter.

System solution 2: On the basis of system solution 1, the converter also includes a clamping capacitor and a clamping diode, the opposite end of the primary winding is connected to the anode of the clamping diode, and the anode of the clamping diode The cathode is connected to one end of the second capacitor, the anode of the fourth freewheeling diode and one end of the clamping capacitor, and the other end of the clamping capacitor is used to connect to the negative pole of the input power supply.

System solution three: On the basis of system solution one or two, the rectification module is a rectification diode, the anode of the rectification diode is connected to the other end of the third capacitor, and the cathode of the rectification diode is connected to the output capacitor.

System Solution 4: On the basis of System Solution 1 or 2, the switch tube is a MOSFET tube or an IGBT tube.

System solution five: on the basis of system solution two, the calculation formula of the gain _MCCM of the converter is:

Among them, D is the duty ratio of the switch tube, and N is the turns ratio of the primary winding and the secondary winding in the coupled inductor.

Description of drawings

Fig. 1 is the circuit structure diagram of the first embodiment of the high-gain converter based on the coupled inductor;

Fig. 2 is the equivalent circuit diagram of the first embodiment of the high-gain converter based on the coupled inductor;

Fig. 3 is a converter modal diagram;

Fig. 4 is the equivalent diagram of the first switching mode of the converter;

Fig. 5 is the equivalent diagram of the second switching mode of the converter;

Fig. 6 is the equivalent diagram of the third switching mode of the converter;

Fig. 7 is the equivalent diagram of the fourth switching mode of the converter;

Fig. 8 is an equivalent diagram of the fifth switching mode of the converter;

Fig. 9 is an equivalent diagram of the sixth switching mode of the converter;

Fig. 10 is a waveform diagram of the voltage at both ends of the gate source of the switching tube of the converter, the current of the switching tube and the current of the clamping diode;

Fig. 11 is a waveform diagram of the voltage across the grid-source of the switching tube of the converter, the current of the secondary winding of the coupling inductor and the current of the output rectifier diode;

Fig. 12 is the waveform diagram of the voltage at both ends of the gate source of the switching tube of the converter, the voltage and the current at the two ends of the freewheeling diode _D3 ;

Fig. 13 is the waveform diagram of voltage, output voltage and output voltage at both ends of the switching tube gate source of the converter;

FIG. 14 is a circuit structure diagram of a second implementation manner of a high-gain converter based on coupled inductors.

Detailed ways

Power System Embodiment 1

This embodiment provides a power supply system, which includes two parts, namely an input power supply V _in and a high-gain converter based on coupled inductors. Since the input power supply V _in belongs to the conventional technology, it will not be described in detail here, and this embodiment focuses on the high-gain converter for specific description.

The high-gain converter is a new type of cascaded high-gain DC/DC converter. If it is applied to a photovoltaic system, the output voltage of the photovoltaic system can be increased by increasing the gain ratio of the converter. The grid provides the required voltage.

As shown in Figure 1, the converter includes an inductor L ₁ , a second inductor, a switch tube S, a clamping capacitor C _b and a clamping diode D _b , wherein the second inductor is a coupled inductor, which consists of the primary winding L ₂ and the secondary The coupled inductor composed of side winding _L3 . In order to correspond to the claims, the first freewheeling diode, the second freewheeling diode, the third freewheeling diode and the fourth freewheeling diode are respectively the freewheeling diode D ₁ , the freewheeling diode D ₂ and the freewheeling diode D ₃ and freewheeling diode D ₄ , the first capacitor, the second capacitor and the third capacitor are respectively capacitor C ₁ , capacitor C ₂ and capacitor C ₃ . In this converter, capacitor C ₂ , capacitor C ₃ , freewheeling diode _D3 and freewheeling diode _D4 form a voltage doubler unit.

One end of the inductor _L1 is connected to the positive pole of the input power supply V _in , the other end of the inductor _L1 is respectively connected to the anode of the freewheeling diode _D1 and the anode of the freewheeling diode _D2 , and the cathode of the freewheeling diode _D1 is connected to the primary winding _L2 The end with the same name of the capacitor _C1 and one end of the capacitor C1, the other end of the capacitor _C1 is connected to the negative pole of the input power supply V _in , the opposite end of the primary winding _L2 is respectively connected to one end of the switch tube S, the cathode of the freewheeling diode _D2 and the clamp The anode of the bit diode D _b , the cathode of the clamp diode D _b is connected to one end of the capacitor _C2 , the anode of the freewheeling diode _D4 and one end of the clamp capacitor C _b , and the other end of the switch tube S is connected to the negative pole of the input power supply V _in , the other end of the clamping capacitor C _b is connected to the negative pole of the input power supply V _in , the other end of the capacitor C ₂ is respectively connected to the anode of the freewheeling diode D ₃ and the same-named end of the secondary winding L ₃ , and the different name of the secondary winding L ₃ Terminals are respectively connected to the cathode of the freewheeling diode _D4 and one terminal of the capacitor _C3 , and the other terminal of the capacitor _C3 is respectively connected to the cathode of the freewheeling diode _D3 and the rectifier module, and the DC terminal of the rectifier module is the output terminal of the converter. The clamping diode D _b and the clamping capacitor C _b form a passive non-destructive clamping circuit, which is used to absorb the energy of the leakage inductance, thereby imitating the peak voltage of the switching tube S, and at the same time, alleviating the reverse recovery problem of the diode. Low-rated devices, thereby improving efficiency, and the clamping diode D _b and clamping capacitor C _b form a loop for releasing the leakage inductance energy of the coupling inductance, which circulates the energy of the leakage inductance to the output terminal, which greatly improves the efficiency of the converter. efficiency.

In this embodiment, the rectification module takes the rectification diode _D0 as an example, then, the other end of the capacitor _C3 is connected to the anode of the rectification diode _D0 , and the cathode of the rectification diode _D0 is respectively connected to one end of the output capacitor _C0 and the end of the load resistor R One end, the other end of the output capacitor C _o and the other end of the load resistor R are connected to the negative pole of the input power supply V _in .

Moreover, in this embodiment, the switch tube S is a MOSFET tube or an IGBT tube.

As shown in Figure 2, the equivalent circuit of the coupled inductor is the excitation inductance L _M , the leakage inductance L _K , the ideal transformer N ₁ on the primary side and the ideal transformer N ₂ on the secondary side. The current of the input power supply is i _in , and the voltage of the input power supply is V _in , the excitation current of the primary winding L ₂ of the coupled inductor is The voltage of the primary winding _L2 of the coupled inductor is The leakage inductance current of the primary winding L ₂ of the coupled inductor is The current of the secondary winding L ₃ of the coupled inductor is The voltage of the secondary winding _L3 of the coupled inductor is The current in inductor _L1 is The voltage across the inductor _L1 is The current of the output rectifier diode _D0 is The voltage across the output rectifier diode _D0 is The current flowing through the switch tube S is i _S , the voltage across the switch tube S is V _S , and the current of the freewheeling diode D ₁ is The voltage across the freewheeling diode _D1 is The freewheeling diode _D2 current is The voltage across the freewheeling diode _D2 is The freewheeling diode _D3 current is The voltage across the freewheeling diode _D3 is The freewheeling diode _D4 current is The voltage across the freewheeling diode _D4 is The current of the clamping diode _Db is The clamping diode _Db voltage is The current in capacitor _C1 is The voltage across capacitor _C1 is The current in capacitor _C2 is The voltage across capacitor _C2 is The current in capacitor _C3 is The voltage across capacitor _C3 is The current of the clamping capacitor C _b is The clamp capacitor _Cb voltage is The current of the output capacitor C _o is The voltage across the output capacitor C _o is The current of the load resistor R is i _o .

Fig. 3 is a mode diagram of the converter, that is, a waveform diagram of each corresponding parameter changing with time. One cycle corresponds to one working process of the converter. Then, for any one cycle, the working process of the converter is divided into 6 switching modes, namely the first switching mode to the sixth switching mode. The specific description is as follows:

The first switching mode corresponds to [t ₀ , t ₁ ] in Figure 3, and the equivalent circuit is shown in Figure 4. At t=t ₀ , the switch S is turned on, and the freewheeling diodes D ₁ , D ₃ , D ₄ and the clamping diode D _b are turned off, and the freewheeling diode D ₂ and the rectifier diode D ₀ are turned on. Figure 4 shows the path of current flow. The input power V _in charges the inductor L ₁ , and the capacitor C ₁ charges the primary winding L ₂ of the coupled inductor. At the same time, the clamping capacitor C _b is connected in series with the capacitors C ₂ , C ₃ and the secondary winding L ₃ of the coupled inductor, and they are in the freewheeling working state together to provide energy for the load. When the freewheeling current flowing through the rectifier diode D ₀ drops to zero, the mode ends, and the rectifier diode D ₀ realizes zero-current shutdown.

The second switching mode corresponds to [t ₁ , t ₂ ] in Figure 3, and the equivalent circuit is shown in Figure 5. At t=t ₁ , the rectifier diode D ₀ is turned off, and the freewheeling diode D ₁ and clamp Diode _Db continues to turn off, while freewheeling diodes _D3 and _D4 are turned on. Figure 5 shows the path of current flow. The inductor L ₁ continues to store the energy provided by the input power supply V _in , and the primary winding L ₂ of the coupled inductor continues to store the energy provided by the capacitor C ₁ . The current of the secondary winding _L3 of the coupled inductor increases from zero and charges the capacitors _C2 and _C3 . Therefore, the capacitors _C2 and _C3 are charged in parallel. In addition, the freewheeling diodes _D3 and _D4 realize zero-current turn-on, and the energy of the load is provided by the output capacitor C _o . When the switch tube S is turned off, the mode ends.

The third switching mode corresponds to [t ₂ , t ₃ ] in Figure 3, and the equivalent circuit is shown in Figure 6. At t=t ₂ , the switching tube S is turned off, and the freewheeling diode D ₁ and the clamping diode D _b is forward-conducting, and freewheeling diode D ₂ is reverse-blocking. Figure 6 shows the path through which the current flows. Since the clamping diode D _b is turned on, the energy stored in the leakage inductance is transferred to the clamping capacitor C _b , so there is no high voltage spike in the voltage of the switch tube S, and the converter’s Efficiency is improved. In addition, the secondary winding L ₃ of the coupled inductor starts freewheeling, the current flowing through the freewheeling diodes D ₃ and D ₄ begins to decrease, and the output capacitor C _o continues to provide energy for the load. The input power supply V _in is connected in series with the inductor _L1 , and then connected in parallel with the capacitor _C1 to charge the clamping capacitor C _b . When the input current of the clamping capacitor C _b is equal to the current flowing through the input power supply V _in , the mode ends.

The fourth switching mode corresponds to [t ₃ , t ₄ ] in Figure 3, and the equivalent circuit is shown in Figure 7. At t=t ₃ , the switching tube S, the freewheeling diodes D ₁ , D ₂ , and D ₃ , D ₄ and the clamping diode D _b all maintain the previous working state. Figure 7 shows the path of current flow. The direction of the current flowing through capacitor _C1 changes, capacitor _C1 starts to absorb energy, and the energy of the leakage inductance continues to be stored in the clamping capacitor _Cb . Due to the freewheeling of the secondary winding _L3 of the coupled inductor, when the current flowing through the freewheeling diodes _D3 and _D4 decreases to zero, the mode ends, and at this time, the freewheeling diodes _D3 and _D4 achieve zero current off.

The fifth switching mode corresponds to [t ₄ , t ₅ ] in Figure 3, and the equivalent circuit is shown in Figure 8. At t=t ₄ , the freewheeling diodes D ₃ and D ₄ are turned off, and the rectifier diode D ₀ conduction. Figure 8 shows the path of current flow. The energy of the input power supply V _in continues to be transferred to the capacitor C ₁ , the clamp capacitor C _b is connected in series with the secondary winding L ₃ of the coupled inductor, and the capacitors C ₂ and C ₃ provide the output capacitor C _o And the load provides energy, therefore, capacitors _C2 and _C3 work in the form of series discharge. At the same time, the charging current of the clamp capacitor C _b decreases. This mode ends when the charging current of the clamp capacitor _Cb decreases to zero.

The sixth switching mode corresponds to [t ₅ , t ₆ ] in Figure 3, and the equivalent circuit is shown in Figure 9. At t=t ₅ , freewheeling diodes D ₃ , D ₄ and clamping diode D _b are turned off off, the rectifier diode _D0 is turned on. Figure 9 shows the path of current flow. The energy of the input power supply V _in continues to be transferred to the capacitor C ₁ , and the primary current of the primary winding L ₂ of the coupled inductor is zero. The clamping capacitor C _b is connected in series with the secondary winding L ₃ of the coupled inductor, and capacitors C ₂ and C ₃ to provide energy to the output capacitor C _o and the load. This mode ends when the next switching cycle begins.

From the above analysis of the working principle of the converter, the specific conditions for achieving high gain are as follows:

When the switch tube S is turned on, according to the second switching mode, the following equation is given:

According to the fourth switching mode, the following equation can be obtained:

According to the fifth switching mode and the sixth switching mode, the following equation can be obtained:

The volt-second product balance equation for L ₁ column is:

The volt-second product balance equation for L ₂ columns is:

From the above analysis, according to the above equation, the gain expression is:

Wherein, D is the duty ratio of the switch tube S, and N is the turns ratio of the primary winding L ₂ and the secondary winding L ₃ in the coupled inductor. Of course, this embodiment focuses on the above gain expression, not on the specific derivation process of the gain expression.

When the converter operates according to the first switching mode to the sixth switching mode, the voltage V _GS at both ends of the gate and source of the switching tube S in the circuit, the current i _S of the switching tube S, and the current of the clamping diode D _b The current of the coupled inductor secondary winding L ₃ output rectifier diode D ₀ current The voltage across the freewheeling diode _D3 Freewheeling diode _D3 current The waveforms of the input voltage V _in and the output voltage V _o are specifically described as follows:

In Fig. 10, the input voltage V _in = 20V, the output voltage V _o = 200V, the ordinate of the voltage V _GS at both ends of the gate source of the switch tube S is 20 volts/cell, and the ordinate of the current i S of the switch tube _S is 20A /cell, the current of the clamping diode _Db The vertical axis is 10 amps/cell.

In Fig. 11, the input voltage V _in = 20V, the output voltage V _o = 200V, the ordinate of the voltage V _GS across the gate and source of the switching tube S is 20 V/cell, and the current of the secondary winding L ₃ of the coupling inductor The ordinate is 10 amps/cell, the output current of the rectifier diode D ₀ The vertical axis is 5 amps/cell.

In Fig. 12, the input voltage V _in = 20V, the output voltage V _o = 200V, the ordinate of the voltage V _GS at both ends of the gate and source of the switching tube S is 20 V/cell, and the voltage at both ends of the freewheeling diode D ₃ The ordinate is 50 V/cell, the current of the freewheeling diode _D3 The vertical axis is 5 amps/cell.

In Fig. 13, the input voltage V _in = 20V, the output voltage V _o = 200V, the ordinate of the voltage V _GS across the gate and source of the switching tube S is 20 volts/cell, and the ordinate of the input voltage _Vin is 10 volts/cell , the output voltage V _o ordinate is 200 volts/cell.

Therefore, the converter adopts a voltage doubler unit (that is, a boost circuit), which improves the boost capability of the converter and reduces the voltage stress of the switch tube and the output diode; moreover, a non-destructive clamp circuit is used to absorb the loop leakage inductance energy , the peak voltage of the switching tube is effectively suppressed, the reverse recovery problem of the diode is alleviated, and the low rated device is used to improve the efficiency. In addition, the structure of the converter does not add additional switching tubes, which reduces the complexity of circuit control, reduces circuit losses, and improves circuit efficiency.

Specific implementations have been given above, but the utility model is not limited to the described implementations. The basic idea of the present utility model lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the present utility model, it does not need to spend creative labor to design various deformation models, formulas and parameters. Changes, modifications, replacements and modifications to the embodiments without departing from the principle and spirit of the present utility model still fall within the protection scope of the present utility model.

Power system embodiment two

This embodiment provides a power supply system, which also includes two major parts, namely an input power supply V _in and a high-gain converter based on coupled inductors. The difference from Embodiment 1 of the power system is that the circuit structure of the converter provided in this embodiment does not include the clamping diode D _b and the clamping capacitor C _b . In addition, the converter provided in Embodiment 1 of the power system The structures are the same, as shown in FIG. 14 , wherein the clamping diode D _b and the clamping capacitor C _b have no influence on the ideal gain of the converter. The specific process of each mode of the converter is the same as the embodiment of the power system, and will not be described in detail here.

Converter Embodiment 1

This embodiment provides a high-gain converter based on coupled inductors. Since the converter has been described in detail in Embodiment 1 of the above-mentioned power supply system, it will not be described in detail here.

Converter Embodiment 2

This embodiment provides a high-gain converter based on coupled inductors. Since the converter has been described in detail in the second embodiment of the power supply system above, no specific description will be given here.

Claims (8)

1. a kind of high-gain converter based on coupling inductance, which is characterized in that including the first inductance and the second inductance, described Two inductance are the coupling inductance being made of primary side winding and vice-side winding, and one end of first inductance is for connecting input power Anode, the other end of first inductance is separately connected the sun of the anode and the second fly-wheel diode of the first fly-wheel diode Pole, the cathode of first fly-wheel diode connect one end of the Same Name of Ends and the first capacitance of the primary side winding, and described first The other end of capacitance is used to connect the cathode of input power, the different name end of the primary side winding be separately connected one end of switching tube, The cathode of second fly-wheel diode, one end of the second capacitance and the 4th fly-wheel diode anode, the other end of the switching tube The other end of cathode for connecting input power, second capacitance is separately connected the anode of third fly-wheel diode and secondary side The Same Name of Ends of winding, the different name end of the vice-side winding be separately connected the 4th fly-wheel diode cathode and third capacitance one End, the other end of the third capacitance are separately connected the cathode and rectification module of third fly-wheel diode, the rectification module DC terminal is the output end of the converter.

2. the high-gain converter according to claim 1 based on coupling inductance, which is characterized in that the converter also wraps Clamp capacitor and clamp diode are included, the different name end of the primary side winding connects the anode of the clamp diode, the clamper The cathode of diode connect one end of second capacitance, the 4th fly-wheel diode anode and the clamp capacitor one end, The other end of the clamp capacitor is used to connect the cathode of input power.

3. the high-gain converter according to claim 1 or 2 based on coupling inductance, which is characterized in that the rectification mould Block is rectifier diode, and the anode of the rectifier diode connects the other end of the third capacitance, the rectifier diode Cathode connects output capacitance.

4. the high-gain converter according to claim 1 or 2 based on coupling inductance, which is characterized in that the switching tube For MOSFET pipes or IGBT pipes.

5. a kind of power-supply system, including input power and the high-gain converter based on coupling inductance, which is characterized in that the change Parallel operation includes the first inductance and the second inductance, and second inductance is the coupling inductance being made of primary side winding and vice-side winding, One end of first inductance is used to connect the anode of input power, and the other end of first inductance is separately connected the first afterflow The cathode of the anode of the anode of diode and the second fly-wheel diode, first fly-wheel diode connects the primary side winding One end of Same Name of Ends and the first capacitance, the other end of first capacitance are used to connect the cathode of input power, the primary side around The different name end of group is separately connected one end of switching tube, the cathode of the second fly-wheel diode, one end of the second capacitance and the 4th afterflow The anode of diode, the other end of the switching tube are used to connect the cathode of input power, the other end point of second capacitance Not Lian Jie the anode of third fly-wheel diode and the Same Name of Ends of vice-side winding, the different name end of the vice-side winding is separately connected the 4th The other end of one end of the cathode and third capacitance of fly-wheel diode, the third capacitance is separately connected third fly-wheel diode Cathode and rectification module, the DC terminal of the rectification module are the output end of the converter.

6. power-supply system according to claim 5, which is characterized in that the converter further includes clamp capacitor and clamper two Pole pipe, the different name end of the primary side winding connect the anode of the clamp diode, and the cathode of the clamp diode connects institute State one end of the second capacitance, the anode and the clamp capacitor of the 4th fly-wheel diode one end, the clamp capacitor it is another Hold the cathode for connecting input power.

7. power-supply system according to claim 5 or 6, which is characterized in that the rectification module is rectifier diode, described The anode of rectifier diode connects the other end of the third capacitance, and the cathode of the rectifier diode connects output capacitance.

8. power-supply system according to claim 5 or 6, which is characterized in that the switching tube is MOSFET pipes or IGBT Pipe.